1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_solaris.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_solaris.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "prims/jniFastGetField.hpp"
41 #include "prims/jvm.h"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/orderAccess.inline.hpp"
52 #include "runtime/osThread.hpp"
53 #include "runtime/perfMemory.hpp"
54 #include "runtime/sharedRuntime.hpp"
55 #include "runtime/statSampler.hpp"
56 #include "runtime/stubRoutines.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/threadCritical.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/attachListener.hpp"
61 #include "services/memTracker.hpp"
62 #include "services/runtimeService.hpp"
63 #include "utilities/decoder.hpp"
64 #include "utilities/defaultStream.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/growableArray.hpp"
67 #include "utilities/vmError.hpp"
68
69 // put OS-includes here
70 # include <dlfcn.h>
71 # include <errno.h>
72 # include <exception>
73 # include <link.h>
74 # include <poll.h>
75 # include <pthread.h>
76 # include <pwd.h>
77 # include <schedctl.h>
78 # include <setjmp.h>
79 # include <signal.h>
80 # include <stdio.h>
81 # include <alloca.h>
82 # include <sys/filio.h>
83 # include <sys/ipc.h>
84 # include <sys/lwp.h>
85 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
86 # include <sys/mman.h>
87 # include <sys/processor.h>
88 # include <sys/procset.h>
89 # include <sys/pset.h>
90 # include <sys/resource.h>
91 # include <sys/shm.h>
92 # include <sys/socket.h>
93 # include <sys/stat.h>
94 # include <sys/systeminfo.h>
95 # include <sys/time.h>
96 # include <sys/times.h>
97 # include <sys/types.h>
98 # include <sys/wait.h>
99 # include <sys/utsname.h>
100 # include <thread.h>
101 # include <unistd.h>
102 # include <sys/priocntl.h>
103 # include <sys/rtpriocntl.h>
104 # include <sys/tspriocntl.h>
105 # include <sys/iapriocntl.h>
106 # include <sys/fxpriocntl.h>
107 # include <sys/loadavg.h>
108 # include <string.h>
109 # include <stdio.h>
110
111 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
112 # include <sys/procfs.h> // see comment in <sys/procfs.h>
113
114 #define MAX_PATH (2 * K)
115
116 // for timer info max values which include all bits
117 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
118
119
120 // Here are some liblgrp types from sys/lgrp_user.h to be able to
121 // compile on older systems without this header file.
122
123 #ifndef MADV_ACCESS_LWP
124 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
125 #endif
126 #ifndef MADV_ACCESS_MANY
127 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
128 #endif
129
130 #ifndef LGRP_RSRC_CPU
131 # define LGRP_RSRC_CPU 0 /* CPU resources */
132 #endif
133 #ifndef LGRP_RSRC_MEM
134 # define LGRP_RSRC_MEM 1 /* memory resources */
135 #endif
136
137 // see thr_setprio(3T) for the basis of these numbers
138 #define MinimumPriority 0
139 #define NormalPriority 64
140 #define MaximumPriority 127
141
142 // Values for ThreadPriorityPolicy == 1
143 int prio_policy1[CriticalPriority+1] = {
144 -99999, 0, 16, 32, 48, 64,
145 80, 96, 112, 124, 127, 127 };
146
147 // System parameters used internally
148 static clock_t clock_tics_per_sec = 100;
149
150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
151 static bool enabled_extended_FILE_stdio = false;
152
153 // For diagnostics to print a message once. see run_periodic_checks
154 static bool check_addr0_done = false;
155 static sigset_t check_signal_done;
156 static bool check_signals = true;
157
158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
160
161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
162
163
164 // "default" initializers for missing libc APIs
165 extern "C" {
166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
168
169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
170 static int lwp_cond_destroy(cond_t *cv) { return 0; }
171 }
172
173 // "default" initializers for pthread-based synchronization
174 extern "C" {
175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
177 }
178
179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
180
181 static inline size_t adjust_stack_size(address base, size_t size) {
182 if ((ssize_t)size < 0) {
183 // 4759953: Compensate for ridiculous stack size.
184 size = max_intx;
185 }
186 if (size > (size_t)base) {
187 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
188 size = (size_t)base;
189 }
190 return size;
191 }
192
193 static inline stack_t get_stack_info() {
194 stack_t st;
195 int retval = thr_stksegment(&st);
196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
197 assert(retval == 0, "incorrect return value from thr_stksegment");
198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
200 return st;
201 }
202
203 bool os::is_primordial_thread(void) {
204 int r = thr_main() ;
205 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
206 return r == 1;
207 }
208
209 address os::current_stack_base() {
210 bool _is_primordial_thread = is_primordial_thread();
211
212 // Workaround 4352906, avoid calls to thr_stksegment by
213 // thr_main after the first one (it looks like we trash
214 // some data, causing the value for ss_sp to be incorrect).
215 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
216 stack_t st = get_stack_info();
217 if (_is_primordial_thread) {
218 // cache initial value of stack base
219 os::Solaris::_main_stack_base = (address)st.ss_sp;
220 }
221 return (address)st.ss_sp;
222 } else {
223 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
224 return os::Solaris::_main_stack_base;
225 }
226 }
227
228 size_t os::current_stack_size() {
229 size_t size;
230
231 if (!is_primordial_thread()) {
232 size = get_stack_info().ss_size;
233 } else {
234 struct rlimit limits;
235 getrlimit(RLIMIT_STACK, &limits);
236 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
237 }
238 // base may not be page aligned
239 address base = current_stack_base();
240 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
241 return (size_t)(base - bottom);
242 }
243
244 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
245 return localtime_r(clock, res);
246 }
247
248 // interruptible infrastructure
249
250 // setup_interruptible saves the thread state before going into an
251 // interruptible system call.
252 // The saved state is used to restore the thread to
253 // its former state whether or not an interrupt is received.
254 // Used by classloader os::read
255 // os::restartable_read calls skip this layer and stay in _thread_in_native
256
257 void os::Solaris::setup_interruptible(JavaThread* thread) {
258
259 JavaThreadState thread_state = thread->thread_state();
260
261 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
262 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
263 OSThread* osthread = thread->osthread();
264 osthread->set_saved_interrupt_thread_state(thread_state);
265 thread->frame_anchor()->make_walkable(thread);
266 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
267 }
268
269 // Version of setup_interruptible() for threads that are already in
270 // _thread_blocked. Used by os_sleep().
271 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
272 thread->frame_anchor()->make_walkable(thread);
273 }
274
275 JavaThread* os::Solaris::setup_interruptible() {
276 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
277 setup_interruptible(thread);
278 return thread;
279 }
280
281 void os::Solaris::try_enable_extended_io() {
282 typedef int (*enable_extended_FILE_stdio_t)(int, int);
283
284 if (!UseExtendedFileIO) {
285 return;
286 }
287
288 enable_extended_FILE_stdio_t enabler =
289 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
290 "enable_extended_FILE_stdio");
291 if (enabler) {
292 enabler(-1, -1);
293 }
294 }
295
296
297 #ifdef ASSERT
298
299 JavaThread* os::Solaris::setup_interruptible_native() {
300 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
301 JavaThreadState thread_state = thread->thread_state();
302 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
303 return thread;
304 }
305
306 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
307 JavaThreadState thread_state = thread->thread_state();
308 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
309 }
310 #endif
311
312 // cleanup_interruptible reverses the effects of setup_interruptible
313 // setup_interruptible_already_blocked() does not need any cleanup.
314
315 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
316 OSThread* osthread = thread->osthread();
317
318 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
319 }
320
321 // I/O interruption related counters called in _INTERRUPTIBLE
322
323 void os::Solaris::bump_interrupted_before_count() {
324 RuntimeService::record_interrupted_before_count();
325 }
326
327 void os::Solaris::bump_interrupted_during_count() {
328 RuntimeService::record_interrupted_during_count();
329 }
330
331 static int _processors_online = 0;
332
333 jint os::Solaris::_os_thread_limit = 0;
334 volatile jint os::Solaris::_os_thread_count = 0;
335
336 julong os::available_memory() {
337 return Solaris::available_memory();
338 }
339
340 julong os::Solaris::available_memory() {
341 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
342 }
343
344 julong os::Solaris::_physical_memory = 0;
345
346 julong os::physical_memory() {
347 return Solaris::physical_memory();
348 }
349
350 static hrtime_t first_hrtime = 0;
351 static const hrtime_t hrtime_hz = 1000*1000*1000;
352 static volatile hrtime_t max_hrtime = 0;
353
354
355 void os::Solaris::initialize_system_info() {
356 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
357 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
358 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
359 }
360
361 int os::active_processor_count() {
362 // User has overridden the number of active processors
363 if (ActiveProcessorCount > 0) {
364 if (Verbose) {
365 tty->print_cr("active_processor_count: "
366 "active processor count set by user : %d",
367 ActiveProcessorCount);
368 }
369 return ActiveProcessorCount;
370 }
371
372 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
373 pid_t pid = getpid();
374 psetid_t pset = PS_NONE;
375 // Are we running in a processor set or is there any processor set around?
376 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
377 uint_t pset_cpus;
378 // Query the number of cpus available to us.
379 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
380 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
381 _processors_online = pset_cpus;
382 return pset_cpus;
383 }
384 }
385 // Otherwise return number of online cpus
386 return online_cpus;
387 }
388
389 static bool find_processors_in_pset(psetid_t pset,
390 processorid_t** id_array,
391 uint_t* id_length) {
392 bool result = false;
393 // Find the number of processors in the processor set.
394 if (pset_info(pset, NULL, id_length, NULL) == 0) {
395 // Make up an array to hold their ids.
396 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
397 // Fill in the array with their processor ids.
398 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
399 result = true;
400 }
401 }
402 return result;
403 }
404
405 // Callers of find_processors_online() must tolerate imprecise results --
406 // the system configuration can change asynchronously because of DR
407 // or explicit psradm operations.
408 //
409 // We also need to take care that the loop (below) terminates as the
410 // number of processors online can change between the _SC_NPROCESSORS_ONLN
411 // request and the loop that builds the list of processor ids. Unfortunately
412 // there's no reliable way to determine the maximum valid processor id,
413 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
414 // man pages, which claim the processor id set is "sparse, but
415 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
416 // exit the loop.
417 //
418 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
419 // not available on S8.0.
420
421 static bool find_processors_online(processorid_t** id_array,
422 uint* id_length) {
423 const processorid_t MAX_PROCESSOR_ID = 100000 ;
424 // Find the number of processors online.
425 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
426 // Make up an array to hold their ids.
427 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
428 // Processors need not be numbered consecutively.
429 long found = 0;
430 processorid_t next = 0;
431 while (found < *id_length && next < MAX_PROCESSOR_ID) {
432 processor_info_t info;
433 if (processor_info(next, &info) == 0) {
434 // NB, PI_NOINTR processors are effectively online ...
435 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
436 (*id_array)[found] = next;
437 found += 1;
438 }
439 }
440 next += 1;
441 }
442 if (found < *id_length) {
443 // The loop above didn't identify the expected number of processors.
444 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
445 // and re-running the loop, above, but there's no guarantee of progress
446 // if the system configuration is in flux. Instead, we just return what
447 // we've got. Note that in the worst case find_processors_online() could
448 // return an empty set. (As a fall-back in the case of the empty set we
449 // could just return the ID of the current processor).
450 *id_length = found ;
451 }
452
453 return true;
454 }
455
456 static bool assign_distribution(processorid_t* id_array,
457 uint id_length,
458 uint* distribution,
459 uint distribution_length) {
460 // We assume we can assign processorid_t's to uint's.
461 assert(sizeof(processorid_t) == sizeof(uint),
462 "can't convert processorid_t to uint");
463 // Quick check to see if we won't succeed.
464 if (id_length < distribution_length) {
465 return false;
466 }
467 // Assign processor ids to the distribution.
468 // Try to shuffle processors to distribute work across boards,
469 // assuming 4 processors per board.
470 const uint processors_per_board = ProcessDistributionStride;
471 // Find the maximum processor id.
472 processorid_t max_id = 0;
473 for (uint m = 0; m < id_length; m += 1) {
474 max_id = MAX2(max_id, id_array[m]);
475 }
476 // The next id, to limit loops.
477 const processorid_t limit_id = max_id + 1;
478 // Make up markers for available processors.
479 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
480 for (uint c = 0; c < limit_id; c += 1) {
481 available_id[c] = false;
482 }
483 for (uint a = 0; a < id_length; a += 1) {
484 available_id[id_array[a]] = true;
485 }
486 // Step by "boards", then by "slot", copying to "assigned".
487 // NEEDS_CLEANUP: The assignment of processors should be stateful,
488 // remembering which processors have been assigned by
489 // previous calls, etc., so as to distribute several
490 // independent calls of this method. What we'd like is
491 // It would be nice to have an API that let us ask
492 // how many processes are bound to a processor,
493 // but we don't have that, either.
494 // In the short term, "board" is static so that
495 // subsequent distributions don't all start at board 0.
496 static uint board = 0;
497 uint assigned = 0;
498 // Until we've found enough processors ....
499 while (assigned < distribution_length) {
500 // ... find the next available processor in the board.
501 for (uint slot = 0; slot < processors_per_board; slot += 1) {
502 uint try_id = board * processors_per_board + slot;
503 if ((try_id < limit_id) && (available_id[try_id] == true)) {
504 distribution[assigned] = try_id;
505 available_id[try_id] = false;
506 assigned += 1;
507 break;
508 }
509 }
510 board += 1;
511 if (board * processors_per_board + 0 >= limit_id) {
512 board = 0;
513 }
514 }
515 if (available_id != NULL) {
516 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
517 }
518 return true;
519 }
520
521 void os::set_native_thread_name(const char *name) {
522 // Not yet implemented.
523 return;
524 }
525
526 bool os::distribute_processes(uint length, uint* distribution) {
527 bool result = false;
528 // Find the processor id's of all the available CPUs.
529 processorid_t* id_array = NULL;
530 uint id_length = 0;
531 // There are some races between querying information and using it,
532 // since processor sets can change dynamically.
533 psetid_t pset = PS_NONE;
534 // Are we running in a processor set?
535 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
536 result = find_processors_in_pset(pset, &id_array, &id_length);
537 } else {
538 result = find_processors_online(&id_array, &id_length);
539 }
540 if (result == true) {
541 if (id_length >= length) {
542 result = assign_distribution(id_array, id_length, distribution, length);
543 } else {
544 result = false;
545 }
546 }
547 if (id_array != NULL) {
548 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
549 }
550 return result;
551 }
552
553 bool os::bind_to_processor(uint processor_id) {
554 // We assume that a processorid_t can be stored in a uint.
555 assert(sizeof(uint) == sizeof(processorid_t),
556 "can't convert uint to processorid_t");
557 int bind_result =
558 processor_bind(P_LWPID, // bind LWP.
559 P_MYID, // bind current LWP.
560 (processorid_t) processor_id, // id.
561 NULL); // don't return old binding.
562 return (bind_result == 0);
563 }
564
565 bool os::getenv(const char* name, char* buffer, int len) {
566 char* val = ::getenv( name );
567 if ( val == NULL
568 || strlen(val) + 1 > len ) {
569 if (len > 0) buffer[0] = 0; // return a null string
570 return false;
571 }
572 strcpy( buffer, val );
573 return true;
574 }
575
576
577 // Return true if user is running as root.
578
579 bool os::have_special_privileges() {
580 static bool init = false;
581 static bool privileges = false;
582 if (!init) {
583 privileges = (getuid() != geteuid()) || (getgid() != getegid());
584 init = true;
585 }
586 return privileges;
587 }
588
589
590 void os::init_system_properties_values() {
591 // The next steps are taken in the product version:
592 //
593 // Obtain the JAVA_HOME value from the location of libjvm.so.
594 // This library should be located at:
595 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
596 //
597 // If "/jre/lib/" appears at the right place in the path, then we
598 // assume libjvm.so is installed in a JDK and we use this path.
599 //
600 // Otherwise exit with message: "Could not create the Java virtual machine."
601 //
602 // The following extra steps are taken in the debugging version:
603 //
604 // If "/jre/lib/" does NOT appear at the right place in the path
605 // instead of exit check for $JAVA_HOME environment variable.
606 //
607 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
608 // then we append a fake suffix "hotspot/libjvm.so" to this path so
609 // it looks like libjvm.so is installed there
610 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
611 //
612 // Otherwise exit.
613 //
614 // Important note: if the location of libjvm.so changes this
615 // code needs to be changed accordingly.
616
617 // Base path of extensions installed on the system.
618 #define SYS_EXT_DIR "/usr/jdk/packages"
619 #define EXTENSIONS_DIR "/lib/ext"
620 #define ENDORSED_DIR "/lib/endorsed"
621
622 char cpu_arch[12];
623 // Buffer that fits several sprintfs.
624 // Note that the space for the colon and the trailing null are provided
625 // by the nulls included by the sizeof operator.
626 const size_t bufsize =
627 MAX4((size_t)MAXPATHLEN, // For dll_dir & friends.
628 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
629 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
630 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
631 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
632
633 // sysclasspath, java_home, dll_dir
634 {
635 char *pslash;
636 os::jvm_path(buf, bufsize);
637
638 // Found the full path to libjvm.so.
639 // Now cut the path to <java_home>/jre if we can.
640 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
641 pslash = strrchr(buf, '/');
642 if (pslash != NULL) {
643 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
644 }
645 Arguments::set_dll_dir(buf);
646
647 if (pslash != NULL) {
648 pslash = strrchr(buf, '/');
649 if (pslash != NULL) {
650 *pslash = '\0'; // Get rid of /<arch>.
651 pslash = strrchr(buf, '/');
652 if (pslash != NULL) {
653 *pslash = '\0'; // Get rid of /lib.
654 }
655 }
656 }
657 Arguments::set_java_home(buf);
658 set_boot_path('/', ':');
659 }
660
661 // Where to look for native libraries.
662 {
663 // Use dlinfo() to determine the correct java.library.path.
664 //
665 // If we're launched by the Java launcher, and the user
666 // does not set java.library.path explicitly on the commandline,
667 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
668 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
669 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
670 // /usr/lib), which is exactly what we want.
671 //
672 // If the user does set java.library.path, it completely
673 // overwrites this setting, and always has.
674 //
675 // If we're not launched by the Java launcher, we may
676 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
677 // settings. Again, dlinfo does exactly what we want.
678
679 Dl_serinfo info_sz, *info = &info_sz;
680 Dl_serpath *path;
681 char *library_path;
682 char *common_path = buf;
683
684 // Determine search path count and required buffer size.
685 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
686 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
687 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
688 }
689
690 // Allocate new buffer and initialize.
691 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
692 info->dls_size = info_sz.dls_size;
693 info->dls_cnt = info_sz.dls_cnt;
694
695 // Obtain search path information.
696 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
697 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
698 FREE_C_HEAP_ARRAY(char, info, mtInternal);
699 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
700 }
701
702 path = &info->dls_serpath[0];
703
704 // Note: Due to a legacy implementation, most of the library path
705 // is set in the launcher. This was to accomodate linking restrictions
706 // on legacy Solaris implementations (which are no longer supported).
707 // Eventually, all the library path setting will be done here.
708 //
709 // However, to prevent the proliferation of improperly built native
710 // libraries, the new path component /usr/jdk/packages is added here.
711
712 // Determine the actual CPU architecture.
713 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
714 #ifdef _LP64
715 // If we are a 64-bit vm, perform the following translations:
716 // sparc -> sparcv9
717 // i386 -> amd64
718 if (strcmp(cpu_arch, "sparc") == 0) {
719 strcat(cpu_arch, "v9");
720 } else if (strcmp(cpu_arch, "i386") == 0) {
721 strcpy(cpu_arch, "amd64");
722 }
723 #endif
724
725 // Construct the invariant part of ld_library_path.
726 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
727
728 // Struct size is more than sufficient for the path components obtained
729 // through the dlinfo() call, so only add additional space for the path
730 // components explicitly added here.
731 size_t library_path_size = info->dls_size + strlen(common_path);
732 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
733 library_path[0] = '\0';
734
735 // Construct the desired Java library path from the linker's library
736 // search path.
737 //
738 // For compatibility, it is optimal that we insert the additional path
739 // components specific to the Java VM after those components specified
740 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
741 // infrastructure.
742 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
743 strcpy(library_path, common_path);
744 } else {
745 int inserted = 0;
746 int i;
747 for (i = 0; i < info->dls_cnt; i++, path++) {
748 uint_t flags = path->dls_flags & LA_SER_MASK;
749 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
750 strcat(library_path, common_path);
751 strcat(library_path, os::path_separator());
752 inserted = 1;
753 }
754 strcat(library_path, path->dls_name);
755 strcat(library_path, os::path_separator());
756 }
757 // Eliminate trailing path separator.
758 library_path[strlen(library_path)-1] = '\0';
759 }
760
761 // happens before argument parsing - can't use a trace flag
762 // tty->print_raw("init_system_properties_values: native lib path: ");
763 // tty->print_raw_cr(library_path);
764
765 // Callee copies into its own buffer.
766 Arguments::set_library_path(library_path);
767
768 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
769 FREE_C_HEAP_ARRAY(char, info, mtInternal);
770 }
771
772 // Extensions directories.
773 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
774 Arguments::set_ext_dirs(buf);
775
776 // Endorsed standards default directory.
777 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
778 Arguments::set_endorsed_dirs(buf);
779
780 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
781
782 #undef SYS_EXT_DIR
783 #undef EXTENSIONS_DIR
784 #undef ENDORSED_DIR
785 }
786
787 void os::breakpoint() {
788 BREAKPOINT;
789 }
790
791 bool os::obsolete_option(const JavaVMOption *option)
792 {
793 if (!strncmp(option->optionString, "-Xt", 3)) {
794 return true;
795 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
796 return true;
797 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
798 return true;
799 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
800 return true;
801 }
802 return false;
803 }
804
805 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
806 address stackStart = (address)thread->stack_base();
807 address stackEnd = (address)(stackStart - (address)thread->stack_size());
808 if (sp < stackStart && sp >= stackEnd ) return true;
809 return false;
810 }
811
812 extern "C" void breakpoint() {
813 // use debugger to set breakpoint here
814 }
815
816 static thread_t main_thread;
817
818 // Thread start routine for all new Java threads
819 extern "C" void* java_start(void* thread_addr) {
820 // Try to randomize the cache line index of hot stack frames.
821 // This helps when threads of the same stack traces evict each other's
822 // cache lines. The threads can be either from the same JVM instance, or
823 // from different JVM instances. The benefit is especially true for
824 // processors with hyperthreading technology.
825 static int counter = 0;
826 int pid = os::current_process_id();
827 alloca(((pid ^ counter++) & 7) * 128);
828
829 int prio;
830 Thread* thread = (Thread*)thread_addr;
831 OSThread* osthr = thread->osthread();
832
833 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
834 thread->_schedctl = (void *) schedctl_init () ;
835
836 if (UseNUMA) {
837 int lgrp_id = os::numa_get_group_id();
838 if (lgrp_id != -1) {
839 thread->set_lgrp_id(lgrp_id);
840 }
841 }
842
843 // If the creator called set priority before we started,
844 // we need to call set_native_priority now that we have an lwp.
845 // We used to get the priority from thr_getprio (we called
846 // thr_setprio way back in create_thread) and pass it to
847 // set_native_priority, but Solaris scales the priority
848 // in java_to_os_priority, so when we read it back here,
849 // we pass trash to set_native_priority instead of what's
850 // in java_to_os_priority. So we save the native priority
851 // in the osThread and recall it here.
852
853 if ( osthr->thread_id() != -1 ) {
854 if ( UseThreadPriorities ) {
855 int prio = osthr->native_priority();
856 if (ThreadPriorityVerbose) {
857 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
858 INTPTR_FORMAT ", setting priority: %d\n",
859 osthr->thread_id(), osthr->lwp_id(), prio);
860 }
861 os::set_native_priority(thread, prio);
862 }
863 } else if (ThreadPriorityVerbose) {
864 warning("Can't set priority in _start routine, thread id hasn't been set\n");
865 }
866
867 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
868
869 // initialize signal mask for this thread
870 os::Solaris::hotspot_sigmask(thread);
871
872 thread->run();
873
874 // One less thread is executing
875 // When the VMThread gets here, the main thread may have already exited
876 // which frees the CodeHeap containing the Atomic::dec code
877 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
878 Atomic::dec(&os::Solaris::_os_thread_count);
879 }
880
881 if (UseDetachedThreads) {
882 thr_exit(NULL);
883 ShouldNotReachHere();
884 }
885 return NULL;
886 }
887
888 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
889 // Allocate the OSThread object
890 OSThread* osthread = new OSThread(NULL, NULL);
891 if (osthread == NULL) return NULL;
892
893 // Store info on the Solaris thread into the OSThread
894 osthread->set_thread_id(thread_id);
895 osthread->set_lwp_id(_lwp_self());
896 thread->_schedctl = (void *) schedctl_init () ;
897
898 if (UseNUMA) {
899 int lgrp_id = os::numa_get_group_id();
900 if (lgrp_id != -1) {
901 thread->set_lgrp_id(lgrp_id);
902 }
903 }
904
905 if ( ThreadPriorityVerbose ) {
906 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
907 osthread->thread_id(), osthread->lwp_id() );
908 }
909
910 // Initial thread state is INITIALIZED, not SUSPENDED
911 osthread->set_state(INITIALIZED);
912
913 return osthread;
914 }
915
916 void os::Solaris::hotspot_sigmask(Thread* thread) {
917
918 //Save caller's signal mask
919 sigset_t sigmask;
920 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
921 OSThread *osthread = thread->osthread();
922 osthread->set_caller_sigmask(sigmask);
923
924 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
925 if (!ReduceSignalUsage) {
926 if (thread->is_VM_thread()) {
927 // Only the VM thread handles BREAK_SIGNAL ...
928 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
929 } else {
930 // ... all other threads block BREAK_SIGNAL
931 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
932 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
933 }
934 }
935 }
936
937 bool os::create_attached_thread(JavaThread* thread) {
938 #ifdef ASSERT
939 thread->verify_not_published();
940 #endif
941 OSThread* osthread = create_os_thread(thread, thr_self());
942 if (osthread == NULL) {
943 return false;
944 }
945
946 // Initial thread state is RUNNABLE
947 osthread->set_state(RUNNABLE);
948 thread->set_osthread(osthread);
949
950 // initialize signal mask for this thread
951 // and save the caller's signal mask
952 os::Solaris::hotspot_sigmask(thread);
953
954 return true;
955 }
956
957 bool os::create_main_thread(JavaThread* thread) {
958 #ifdef ASSERT
959 thread->verify_not_published();
960 #endif
961 if (_starting_thread == NULL) {
962 _starting_thread = create_os_thread(thread, main_thread);
963 if (_starting_thread == NULL) {
964 return false;
965 }
966 }
967
968 // The primodial thread is runnable from the start
969 _starting_thread->set_state(RUNNABLE);
970
971 thread->set_osthread(_starting_thread);
972
973 // initialize signal mask for this thread
974 // and save the caller's signal mask
975 os::Solaris::hotspot_sigmask(thread);
976
977 return true;
978 }
979
980 // _T2_libthread is true if we believe we are running with the newer
981 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
982 bool os::Solaris::_T2_libthread = false;
983
984 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
985 // Allocate the OSThread object
986 OSThread* osthread = new OSThread(NULL, NULL);
987 if (osthread == NULL) {
988 return false;
989 }
990
991 if ( ThreadPriorityVerbose ) {
992 char *thrtyp;
993 switch ( thr_type ) {
994 case vm_thread:
995 thrtyp = (char *)"vm";
996 break;
997 case cgc_thread:
998 thrtyp = (char *)"cgc";
999 break;
1000 case pgc_thread:
1001 thrtyp = (char *)"pgc";
1002 break;
1003 case java_thread:
1004 thrtyp = (char *)"java";
1005 break;
1006 case compiler_thread:
1007 thrtyp = (char *)"compiler";
1008 break;
1009 case watcher_thread:
1010 thrtyp = (char *)"watcher";
1011 break;
1012 default:
1013 thrtyp = (char *)"unknown";
1014 break;
1015 }
1016 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1017 }
1018
1019 // Calculate stack size if it's not specified by caller.
1020 if (stack_size == 0) {
1021 // The default stack size 1M (2M for LP64).
1022 stack_size = (BytesPerWord >> 2) * K * K;
1023
1024 switch (thr_type) {
1025 case os::java_thread:
1026 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1027 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1028 break;
1029 case os::compiler_thread:
1030 if (CompilerThreadStackSize > 0) {
1031 stack_size = (size_t)(CompilerThreadStackSize * K);
1032 break;
1033 } // else fall through:
1034 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1035 case os::vm_thread:
1036 case os::pgc_thread:
1037 case os::cgc_thread:
1038 case os::watcher_thread:
1039 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1040 break;
1041 }
1042 }
1043 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1044
1045 // Initial state is ALLOCATED but not INITIALIZED
1046 osthread->set_state(ALLOCATED);
1047
1048 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1049 // We got lots of threads. Check if we still have some address space left.
1050 // Need to be at least 5Mb of unreserved address space. We do check by
1051 // trying to reserve some.
1052 const size_t VirtualMemoryBangSize = 20*K*K;
1053 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1054 if (mem == NULL) {
1055 delete osthread;
1056 return false;
1057 } else {
1058 // Release the memory again
1059 os::release_memory(mem, VirtualMemoryBangSize);
1060 }
1061 }
1062
1063 // Setup osthread because the child thread may need it.
1064 thread->set_osthread(osthread);
1065
1066 // Create the Solaris thread
1067 // explicit THR_BOUND for T2_libthread case in case
1068 // that assumption is not accurate, but our alternate signal stack
1069 // handling is based on it which must have bound threads
1070 thread_t tid = 0;
1071 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1072 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1073 (thr_type == vm_thread) ||
1074 (thr_type == cgc_thread) ||
1075 (thr_type == pgc_thread) ||
1076 (thr_type == compiler_thread && BackgroundCompilation)) ?
1077 THR_BOUND : 0);
1078 int status;
1079
1080 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1081 //
1082 // On multiprocessors systems, libthread sometimes under-provisions our
1083 // process with LWPs. On a 30-way systems, for instance, we could have
1084 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1085 // to our process. This can result in under utilization of PEs.
1086 // I suspect the problem is related to libthread's LWP
1087 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1088 // upcall policy.
1089 //
1090 // The following code is palliative -- it attempts to ensure that our
1091 // process has sufficient LWPs to take advantage of multiple PEs.
1092 // Proper long-term cures include using user-level threads bound to LWPs
1093 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1094 // slight timing window with respect to sampling _os_thread_count, but
1095 // the race is benign. Also, we should periodically recompute
1096 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1097 // the number of PEs in our partition. You might be tempted to use
1098 // THR_NEW_LWP here, but I'd recommend against it as that could
1099 // result in undesirable growth of the libthread's LWP pool.
1100 // The fix below isn't sufficient; for instance, it doesn't take into count
1101 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1102 //
1103 // Some pathologies this scheme doesn't handle:
1104 // * Threads can block, releasing the LWPs. The LWPs can age out.
1105 // When a large number of threads become ready again there aren't
1106 // enough LWPs available to service them. This can occur when the
1107 // number of ready threads oscillates.
1108 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1109 //
1110 // Finally, we should call thr_setconcurrency() periodically to refresh
1111 // the LWP pool and thwart the LWP age-out mechanism.
1112 // The "+3" term provides a little slop -- we want to slightly overprovision.
1113
1114 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1115 if (!(flags & THR_BOUND)) {
1116 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1117 }
1118 }
1119 // Although this doesn't hurt, we should warn of undefined behavior
1120 // when using unbound T1 threads with schedctl(). This should never
1121 // happen, as the compiler and VM threads are always created bound
1122 DEBUG_ONLY(
1123 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1124 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1125 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1126 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1127 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1128 }
1129 );
1130
1131
1132 // Mark that we don't have an lwp or thread id yet.
1133 // In case we attempt to set the priority before the thread starts.
1134 osthread->set_lwp_id(-1);
1135 osthread->set_thread_id(-1);
1136
1137 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1138 if (status != 0) {
1139 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1140 perror("os::create_thread");
1141 }
1142 thread->set_osthread(NULL);
1143 // Need to clean up stuff we've allocated so far
1144 delete osthread;
1145 return false;
1146 }
1147
1148 Atomic::inc(&os::Solaris::_os_thread_count);
1149
1150 // Store info on the Solaris thread into the OSThread
1151 osthread->set_thread_id(tid);
1152
1153 // Remember that we created this thread so we can set priority on it
1154 osthread->set_vm_created();
1155
1156 // Set the default thread priority. If using bound threads, setting
1157 // lwp priority will be delayed until thread start.
1158 set_native_priority(thread,
1159 DefaultThreadPriority == -1 ?
1160 java_to_os_priority[NormPriority] :
1161 DefaultThreadPriority);
1162
1163 // Initial thread state is INITIALIZED, not SUSPENDED
1164 osthread->set_state(INITIALIZED);
1165
1166 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1167 return true;
1168 }
1169
1170 /* defined for >= Solaris 10. This allows builds on earlier versions
1171 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1172 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1173 * and -XX:+UseAltSigs does nothing since these should have no conflict
1174 */
1175 #if !defined(SIGJVM1)
1176 #define SIGJVM1 39
1177 #define SIGJVM2 40
1178 #endif
1179
1180 debug_only(static bool signal_sets_initialized = false);
1181 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1182 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1183 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1184
1185 bool os::Solaris::is_sig_ignored(int sig) {
1186 struct sigaction oact;
1187 sigaction(sig, (struct sigaction*)NULL, &oact);
1188 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1189 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1190 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1191 return true;
1192 else
1193 return false;
1194 }
1195
1196 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1197 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1198 static bool isJVM1available() {
1199 return SIGJVM1 < SIGRTMIN;
1200 }
1201
1202 void os::Solaris::signal_sets_init() {
1203 // Should also have an assertion stating we are still single-threaded.
1204 assert(!signal_sets_initialized, "Already initialized");
1205 // Fill in signals that are necessarily unblocked for all threads in
1206 // the VM. Currently, we unblock the following signals:
1207 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1208 // by -Xrs (=ReduceSignalUsage));
1209 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1210 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1211 // the dispositions or masks wrt these signals.
1212 // Programs embedding the VM that want to use the above signals for their
1213 // own purposes must, at this time, use the "-Xrs" option to prevent
1214 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1215 // (See bug 4345157, and other related bugs).
1216 // In reality, though, unblocking these signals is really a nop, since
1217 // these signals are not blocked by default.
1218 sigemptyset(&unblocked_sigs);
1219 sigemptyset(&allowdebug_blocked_sigs);
1220 sigaddset(&unblocked_sigs, SIGILL);
1221 sigaddset(&unblocked_sigs, SIGSEGV);
1222 sigaddset(&unblocked_sigs, SIGBUS);
1223 sigaddset(&unblocked_sigs, SIGFPE);
1224
1225 if (isJVM1available) {
1226 os::Solaris::set_SIGinterrupt(SIGJVM1);
1227 os::Solaris::set_SIGasync(SIGJVM2);
1228 } else if (UseAltSigs) {
1229 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1230 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1231 } else {
1232 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1233 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1234 }
1235
1236 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1237 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1238
1239 if (!ReduceSignalUsage) {
1240 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1241 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1242 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1243 }
1244 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1245 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1246 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1247 }
1248 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1249 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1250 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1251 }
1252 }
1253 // Fill in signals that are blocked by all but the VM thread.
1254 sigemptyset(&vm_sigs);
1255 if (!ReduceSignalUsage)
1256 sigaddset(&vm_sigs, BREAK_SIGNAL);
1257 debug_only(signal_sets_initialized = true);
1258
1259 // For diagnostics only used in run_periodic_checks
1260 sigemptyset(&check_signal_done);
1261 }
1262
1263 // These are signals that are unblocked while a thread is running Java.
1264 // (For some reason, they get blocked by default.)
1265 sigset_t* os::Solaris::unblocked_signals() {
1266 assert(signal_sets_initialized, "Not initialized");
1267 return &unblocked_sigs;
1268 }
1269
1270 // These are the signals that are blocked while a (non-VM) thread is
1271 // running Java. Only the VM thread handles these signals.
1272 sigset_t* os::Solaris::vm_signals() {
1273 assert(signal_sets_initialized, "Not initialized");
1274 return &vm_sigs;
1275 }
1276
1277 // These are signals that are blocked during cond_wait to allow debugger in
1278 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1279 assert(signal_sets_initialized, "Not initialized");
1280 return &allowdebug_blocked_sigs;
1281 }
1282
1283
1284 void _handle_uncaught_cxx_exception() {
1285 VMError err("An uncaught C++ exception");
1286 err.report_and_die();
1287 }
1288
1289
1290 // First crack at OS-specific initialization, from inside the new thread.
1291 void os::initialize_thread(Thread* thr) {
1292 if (is_primordial_thread()) {
1293 JavaThread* jt = (JavaThread *)thr;
1294 assert(jt != NULL,"Sanity check");
1295 size_t stack_size;
1296 address base = jt->stack_base();
1297 if (Arguments::created_by_java_launcher()) {
1298 // Use 2MB to allow for Solaris 7 64 bit mode.
1299 stack_size = JavaThread::stack_size_at_create() == 0
1300 ? 2048*K : JavaThread::stack_size_at_create();
1301
1302 // There are rare cases when we may have already used more than
1303 // the basic stack size allotment before this method is invoked.
1304 // Attempt to allow for a normally sized java_stack.
1305 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1306 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1307 } else {
1308 // 6269555: If we were not created by a Java launcher, i.e. if we are
1309 // running embedded in a native application, treat the primordial thread
1310 // as much like a native attached thread as possible. This means using
1311 // the current stack size from thr_stksegment(), unless it is too large
1312 // to reliably setup guard pages. A reasonable max size is 8MB.
1313 size_t current_size = current_stack_size();
1314 // This should never happen, but just in case....
1315 if (current_size == 0) current_size = 2 * K * K;
1316 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1317 }
1318 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1319 stack_size = (size_t)(base - bottom);
1320
1321 assert(stack_size > 0, "Stack size calculation problem");
1322
1323 if (stack_size > jt->stack_size()) {
1324 NOT_PRODUCT(
1325 struct rlimit limits;
1326 getrlimit(RLIMIT_STACK, &limits);
1327 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1328 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1329 )
1330 tty->print_cr(
1331 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1332 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1333 "See limit(1) to increase the stack size limit.",
1334 stack_size / K, jt->stack_size() / K);
1335 vm_exit(1);
1336 }
1337 assert(jt->stack_size() >= stack_size,
1338 "Attempt to map more stack than was allocated");
1339 jt->set_stack_size(stack_size);
1340 }
1341
1342 // 5/22/01: Right now alternate signal stacks do not handle
1343 // throwing stack overflow exceptions, see bug 4463178
1344 // Until a fix is found for this, T2 will NOT imply alternate signal
1345 // stacks.
1346 // If using T2 libthread threads, install an alternate signal stack.
1347 // Because alternate stacks associate with LWPs on Solaris,
1348 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1349 // we prefer to explicitly stack bang.
1350 // If not using T2 libthread, but using UseBoundThreads any threads
1351 // (primordial thread, jni_attachCurrentThread) we do not create,
1352 // probably are not bound, therefore they can not have an alternate
1353 // signal stack. Since our stack banging code is generated and
1354 // is shared across threads, all threads must be bound to allow
1355 // using alternate signal stacks. The alternative is to interpose
1356 // on _lwp_create to associate an alt sig stack with each LWP,
1357 // and this could be a problem when the JVM is embedded.
1358 // We would prefer to use alternate signal stacks with T2
1359 // Since there is currently no accurate way to detect T2
1360 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1361 // on installing alternate signal stacks
1362
1363
1364 // 05/09/03: removed alternate signal stack support for Solaris
1365 // The alternate signal stack mechanism is no longer needed to
1366 // handle stack overflow. This is now handled by allocating
1367 // guard pages (red zone) and stackbanging.
1368 // Initially the alternate signal stack mechanism was removed because
1369 // it did not work with T1 llibthread. Alternate
1370 // signal stacks MUST have all threads bound to lwps. Applications
1371 // can create their own threads and attach them without their being
1372 // bound under T1. This is frequently the case for the primordial thread.
1373 // If we were ever to reenable this mechanism we would need to
1374 // use the dynamic check for T2 libthread.
1375
1376 os::Solaris::init_thread_fpu_state();
1377 std::set_terminate(_handle_uncaught_cxx_exception);
1378 }
1379
1380
1381
1382 // Free Solaris resources related to the OSThread
1383 void os::free_thread(OSThread* osthread) {
1384 assert(osthread != NULL, "os::free_thread but osthread not set");
1385
1386
1387 // We are told to free resources of the argument thread,
1388 // but we can only really operate on the current thread.
1389 // The main thread must take the VMThread down synchronously
1390 // before the main thread exits and frees up CodeHeap
1391 guarantee((Thread::current()->osthread() == osthread
1392 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1393 if (Thread::current()->osthread() == osthread) {
1394 // Restore caller's signal mask
1395 sigset_t sigmask = osthread->caller_sigmask();
1396 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1397 }
1398 delete osthread;
1399 }
1400
1401 void os::pd_start_thread(Thread* thread) {
1402 int status = thr_continue(thread->osthread()->thread_id());
1403 assert_status(status == 0, status, "thr_continue failed");
1404 }
1405
1406
1407 intx os::current_thread_id() {
1408 return (intx)thr_self();
1409 }
1410
1411 static pid_t _initial_pid = 0;
1412
1413 int os::current_process_id() {
1414 return (int)(_initial_pid ? _initial_pid : getpid());
1415 }
1416
1417 // gethrtime() should be monotonic according to the documentation,
1418 // but some virtualized platforms are known to break this guarantee.
1419 // getTimeNanos() must be guaranteed not to move backwards, so we
1420 // are forced to add a check here.
1421 inline hrtime_t getTimeNanos() {
1422 const hrtime_t now = gethrtime();
1423 const hrtime_t prev = max_hrtime;
1424 if (now <= prev) {
1425 return prev; // same or retrograde time;
1426 }
1427 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1428 assert(obsv >= prev, "invariant"); // Monotonicity
1429 // If the CAS succeeded then we're done and return "now".
1430 // If the CAS failed and the observed value "obsv" is >= now then
1431 // we should return "obsv". If the CAS failed and now > obsv > prv then
1432 // some other thread raced this thread and installed a new value, in which case
1433 // we could either (a) retry the entire operation, (b) retry trying to install now
1434 // or (c) just return obsv. We use (c). No loop is required although in some cases
1435 // we might discard a higher "now" value in deference to a slightly lower but freshly
1436 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1437 // to (a) or (b) -- and greatly reduces coherence traffic.
1438 // We might also condition (c) on the magnitude of the delta between obsv and now.
1439 // Avoiding excessive CAS operations to hot RW locations is critical.
1440 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1441 return (prev == obsv) ? now : obsv;
1442 }
1443
1444 // Time since start-up in seconds to a fine granularity.
1445 // Used by VMSelfDestructTimer and the MemProfiler.
1446 double os::elapsedTime() {
1447 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1448 }
1449
1450 jlong os::elapsed_counter() {
1451 return (jlong)(getTimeNanos() - first_hrtime);
1452 }
1453
1454 jlong os::elapsed_frequency() {
1455 return hrtime_hz;
1456 }
1457
1458 // Return the real, user, and system times in seconds from an
1459 // arbitrary fixed point in the past.
1460 bool os::getTimesSecs(double* process_real_time,
1461 double* process_user_time,
1462 double* process_system_time) {
1463 struct tms ticks;
1464 clock_t real_ticks = times(&ticks);
1465
1466 if (real_ticks == (clock_t) (-1)) {
1467 return false;
1468 } else {
1469 double ticks_per_second = (double) clock_tics_per_sec;
1470 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1471 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1472 // For consistency return the real time from getTimeNanos()
1473 // converted to seconds.
1474 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1475
1476 return true;
1477 }
1478 }
1479
1480 bool os::supports_vtime() { return true; }
1481
1482 bool os::enable_vtime() {
1483 int fd = ::open("/proc/self/ctl", O_WRONLY);
1484 if (fd == -1)
1485 return false;
1486
1487 long cmd[] = { PCSET, PR_MSACCT };
1488 int res = ::write(fd, cmd, sizeof(long) * 2);
1489 ::close(fd);
1490 if (res != sizeof(long) * 2)
1491 return false;
1492
1493 return true;
1494 }
1495
1496 bool os::vtime_enabled() {
1497 int fd = ::open("/proc/self/status", O_RDONLY);
1498 if (fd == -1)
1499 return false;
1500
1501 pstatus_t status;
1502 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1503 ::close(fd);
1504 if (res != sizeof(pstatus_t))
1505 return false;
1506
1507 return status.pr_flags & PR_MSACCT;
1508 }
1509
1510 double os::elapsedVTime() {
1511 return (double)gethrvtime() / (double)hrtime_hz;
1512 }
1513
1514 // Used internally for comparisons only
1515 // getTimeMillis guaranteed to not move backwards on Solaris
1516 jlong getTimeMillis() {
1517 jlong nanotime = getTimeNanos();
1518 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1519 }
1520
1521 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1522 jlong os::javaTimeMillis() {
1523 timeval t;
1524 if (gettimeofday( &t, NULL) == -1)
1525 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1526 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1527 }
1528
1529 jlong os::javaTimeNanos() {
1530 return (jlong)getTimeNanos();
1531 }
1532
1533 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1534 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1535 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1536 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1537 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1538 }
1539
1540 char * os::local_time_string(char *buf, size_t buflen) {
1541 struct tm t;
1542 time_t long_time;
1543 time(&long_time);
1544 localtime_r(&long_time, &t);
1545 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1546 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1547 t.tm_hour, t.tm_min, t.tm_sec);
1548 return buf;
1549 }
1550
1551 // Note: os::shutdown() might be called very early during initialization, or
1552 // called from signal handler. Before adding something to os::shutdown(), make
1553 // sure it is async-safe and can handle partially initialized VM.
1554 void os::shutdown() {
1555
1556 // allow PerfMemory to attempt cleanup of any persistent resources
1557 perfMemory_exit();
1558
1559 // needs to remove object in file system
1560 AttachListener::abort();
1561
1562 // flush buffered output, finish log files
1563 ostream_abort();
1564
1565 // Check for abort hook
1566 abort_hook_t abort_hook = Arguments::abort_hook();
1567 if (abort_hook != NULL) {
1568 abort_hook();
1569 }
1570 }
1571
1572 // Note: os::abort() might be called very early during initialization, or
1573 // called from signal handler. Before adding something to os::abort(), make
1574 // sure it is async-safe and can handle partially initialized VM.
1575 void os::abort(bool dump_core) {
1576 os::shutdown();
1577 if (dump_core) {
1578 #ifndef PRODUCT
1579 fdStream out(defaultStream::output_fd());
1580 out.print_raw("Current thread is ");
1581 char buf[16];
1582 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1583 out.print_raw_cr(buf);
1584 out.print_raw_cr("Dumping core ...");
1585 #endif
1586 ::abort(); // dump core (for debugging)
1587 }
1588
1589 ::exit(1);
1590 }
1591
1592 // Die immediately, no exit hook, no abort hook, no cleanup.
1593 void os::die() {
1594 ::abort(); // dump core (for debugging)
1595 }
1596
1597 // DLL functions
1598
1599 const char* os::dll_file_extension() { return ".so"; }
1600
1601 // This must be hard coded because it's the system's temporary
1602 // directory not the java application's temp directory, ala java.io.tmpdir.
1603 const char* os::get_temp_directory() { return "/tmp"; }
1604
1605 static bool file_exists(const char* filename) {
1606 struct stat statbuf;
1607 if (filename == NULL || strlen(filename) == 0) {
1608 return false;
1609 }
1610 return os::stat(filename, &statbuf) == 0;
1611 }
1612
1613 bool os::dll_build_name(char* buffer, size_t buflen,
1614 const char* pname, const char* fname) {
1615 bool retval = false;
1616 const size_t pnamelen = pname ? strlen(pname) : 0;
1617
1618 // Return error on buffer overflow.
1619 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1620 return retval;
1621 }
1622
1623 if (pnamelen == 0) {
1624 snprintf(buffer, buflen, "lib%s.so", fname);
1625 retval = true;
1626 } else if (strchr(pname, *os::path_separator()) != NULL) {
1627 int n;
1628 char** pelements = split_path(pname, &n);
1629 if (pelements == NULL) {
1630 return false;
1631 }
1632 for (int i = 0 ; i < n ; i++) {
1633 // really shouldn't be NULL but what the heck, check can't hurt
1634 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1635 continue; // skip the empty path values
1636 }
1637 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1638 if (file_exists(buffer)) {
1639 retval = true;
1640 break;
1641 }
1642 }
1643 // release the storage
1644 for (int i = 0 ; i < n ; i++) {
1645 if (pelements[i] != NULL) {
1646 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1647 }
1648 }
1649 if (pelements != NULL) {
1650 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1651 }
1652 } else {
1653 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1654 retval = true;
1655 }
1656 return retval;
1657 }
1658
1659 // check if addr is inside libjvm.so
1660 bool os::address_is_in_vm(address addr) {
1661 static address libjvm_base_addr;
1662 Dl_info dlinfo;
1663
1664 if (libjvm_base_addr == NULL) {
1665 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1666 libjvm_base_addr = (address)dlinfo.dli_fbase;
1667 }
1668 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1669 }
1670
1671 if (dladdr((void *)addr, &dlinfo) != 0) {
1672 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1673 }
1674
1675 return false;
1676 }
1677
1678 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1679 static dladdr1_func_type dladdr1_func = NULL;
1680
1681 bool os::dll_address_to_function_name(address addr, char *buf,
1682 int buflen, int * offset) {
1683 // buf is not optional, but offset is optional
1684 assert(buf != NULL, "sanity check");
1685
1686 Dl_info dlinfo;
1687
1688 // dladdr1_func was initialized in os::init()
1689 if (dladdr1_func != NULL) {
1690 // yes, we have dladdr1
1691
1692 // Support for dladdr1 is checked at runtime; it may be
1693 // available even if the vm is built on a machine that does
1694 // not have dladdr1 support. Make sure there is a value for
1695 // RTLD_DL_SYMENT.
1696 #ifndef RTLD_DL_SYMENT
1697 #define RTLD_DL_SYMENT 1
1698 #endif
1699 #ifdef _LP64
1700 Elf64_Sym * info;
1701 #else
1702 Elf32_Sym * info;
1703 #endif
1704 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1705 RTLD_DL_SYMENT) != 0) {
1706 // see if we have a matching symbol that covers our address
1707 if (dlinfo.dli_saddr != NULL &&
1708 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1709 if (dlinfo.dli_sname != NULL) {
1710 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1711 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1712 }
1713 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1714 return true;
1715 }
1716 }
1717 // no matching symbol so try for just file info
1718 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1719 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1720 buf, buflen, offset, dlinfo.dli_fname)) {
1721 return true;
1722 }
1723 }
1724 }
1725 buf[0] = '\0';
1726 if (offset != NULL) *offset = -1;
1727 return false;
1728 }
1729
1730 // no, only dladdr is available
1731 if (dladdr((void *)addr, &dlinfo) != 0) {
1732 // see if we have a matching symbol
1733 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1734 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1735 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1736 }
1737 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1738 return true;
1739 }
1740 // no matching symbol so try for just file info
1741 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1742 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1743 buf, buflen, offset, dlinfo.dli_fname)) {
1744 return true;
1745 }
1746 }
1747 }
1748 buf[0] = '\0';
1749 if (offset != NULL) *offset = -1;
1750 return false;
1751 }
1752
1753 bool os::dll_address_to_library_name(address addr, char* buf,
1754 int buflen, int* offset) {
1755 // buf is not optional, but offset is optional
1756 assert(buf != NULL, "sanity check");
1757
1758 Dl_info dlinfo;
1759
1760 if (dladdr((void*)addr, &dlinfo) != 0) {
1761 if (dlinfo.dli_fname != NULL) {
1762 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1763 }
1764 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1765 *offset = addr - (address)dlinfo.dli_fbase;
1766 }
1767 return true;
1768 }
1769
1770 buf[0] = '\0';
1771 if (offset) *offset = -1;
1772 return false;
1773 }
1774
1775 // Prints the names and full paths of all opened dynamic libraries
1776 // for current process
1777 void os::print_dll_info(outputStream * st) {
1778 Dl_info dli;
1779 void *handle;
1780 Link_map *map;
1781 Link_map *p;
1782
1783 st->print_cr("Dynamic libraries:"); st->flush();
1784
1785 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1786 dli.dli_fname == NULL) {
1787 st->print_cr("Error: Cannot print dynamic libraries.");
1788 return;
1789 }
1790 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1791 if (handle == NULL) {
1792 st->print_cr("Error: Cannot print dynamic libraries.");
1793 return;
1794 }
1795 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1796 if (map == NULL) {
1797 st->print_cr("Error: Cannot print dynamic libraries.");
1798 return;
1799 }
1800
1801 while (map->l_prev != NULL)
1802 map = map->l_prev;
1803
1804 while (map != NULL) {
1805 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1806 map = map->l_next;
1807 }
1808
1809 dlclose(handle);
1810 }
1811
1812 // Loads .dll/.so and
1813 // in case of error it checks if .dll/.so was built for the
1814 // same architecture as Hotspot is running on
1815
1816 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1817 {
1818 void * result= ::dlopen(filename, RTLD_LAZY);
1819 if (result != NULL) {
1820 // Successful loading
1821 return result;
1822 }
1823
1824 Elf32_Ehdr elf_head;
1825
1826 // Read system error message into ebuf
1827 // It may or may not be overwritten below
1828 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1829 ebuf[ebuflen-1]='\0';
1830 int diag_msg_max_length=ebuflen-strlen(ebuf);
1831 char* diag_msg_buf=ebuf+strlen(ebuf);
1832
1833 if (diag_msg_max_length==0) {
1834 // No more space in ebuf for additional diagnostics message
1835 return NULL;
1836 }
1837
1838
1839 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1840
1841 if (file_descriptor < 0) {
1842 // Can't open library, report dlerror() message
1843 return NULL;
1844 }
1845
1846 bool failed_to_read_elf_head=
1847 (sizeof(elf_head)!=
1848 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1849
1850 ::close(file_descriptor);
1851 if (failed_to_read_elf_head) {
1852 // file i/o error - report dlerror() msg
1853 return NULL;
1854 }
1855
1856 typedef struct {
1857 Elf32_Half code; // Actual value as defined in elf.h
1858 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1859 char elf_class; // 32 or 64 bit
1860 char endianess; // MSB or LSB
1861 char* name; // String representation
1862 } arch_t;
1863
1864 static const arch_t arch_array[]={
1865 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1866 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1867 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1868 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1869 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1870 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1871 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1872 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1873 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1874 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1875 };
1876
1877 #if (defined IA32)
1878 static Elf32_Half running_arch_code=EM_386;
1879 #elif (defined AMD64)
1880 static Elf32_Half running_arch_code=EM_X86_64;
1881 #elif (defined IA64)
1882 static Elf32_Half running_arch_code=EM_IA_64;
1883 #elif (defined __sparc) && (defined _LP64)
1884 static Elf32_Half running_arch_code=EM_SPARCV9;
1885 #elif (defined __sparc) && (!defined _LP64)
1886 static Elf32_Half running_arch_code=EM_SPARC;
1887 #elif (defined __powerpc64__)
1888 static Elf32_Half running_arch_code=EM_PPC64;
1889 #elif (defined __powerpc__)
1890 static Elf32_Half running_arch_code=EM_PPC;
1891 #elif (defined ARM)
1892 static Elf32_Half running_arch_code=EM_ARM;
1893 #else
1894 #error Method os::dll_load requires that one of following is defined:\
1895 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1896 #endif
1897
1898 // Identify compatability class for VM's architecture and library's architecture
1899 // Obtain string descriptions for architectures
1900
1901 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1902 int running_arch_index=-1;
1903
1904 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
1905 if (running_arch_code == arch_array[i].code) {
1906 running_arch_index = i;
1907 }
1908 if (lib_arch.code == arch_array[i].code) {
1909 lib_arch.compat_class = arch_array[i].compat_class;
1910 lib_arch.name = arch_array[i].name;
1911 }
1912 }
1913
1914 assert(running_arch_index != -1,
1915 "Didn't find running architecture code (running_arch_code) in arch_array");
1916 if (running_arch_index == -1) {
1917 // Even though running architecture detection failed
1918 // we may still continue with reporting dlerror() message
1919 return NULL;
1920 }
1921
1922 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1923 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1924 return NULL;
1925 }
1926
1927 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1928 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1929 return NULL;
1930 }
1931
1932 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1933 if ( lib_arch.name!=NULL ) {
1934 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1935 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1936 lib_arch.name, arch_array[running_arch_index].name);
1937 } else {
1938 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1939 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1940 lib_arch.code,
1941 arch_array[running_arch_index].name);
1942 }
1943 }
1944
1945 return NULL;
1946 }
1947
1948 void* os::dll_lookup(void* handle, const char* name) {
1949 return dlsym(handle, name);
1950 }
1951
1952 void* os::get_default_process_handle() {
1953 return (void*)::dlopen(NULL, RTLD_LAZY);
1954 }
1955
1956 int os::stat(const char *path, struct stat *sbuf) {
1957 char pathbuf[MAX_PATH];
1958 if (strlen(path) > MAX_PATH - 1) {
1959 errno = ENAMETOOLONG;
1960 return -1;
1961 }
1962 os::native_path(strcpy(pathbuf, path));
1963 return ::stat(pathbuf, sbuf);
1964 }
1965
1966 static bool _print_ascii_file(const char* filename, outputStream* st) {
1967 int fd = ::open(filename, O_RDONLY);
1968 if (fd == -1) {
1969 return false;
1970 }
1971
1972 char buf[32];
1973 int bytes;
1974 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1975 st->print_raw(buf, bytes);
1976 }
1977
1978 ::close(fd);
1979
1980 return true;
1981 }
1982
1983 void os::print_os_info_brief(outputStream* st) {
1984 os::Solaris::print_distro_info(st);
1985
1986 os::Posix::print_uname_info(st);
1987
1988 os::Solaris::print_libversion_info(st);
1989 }
1990
1991 void os::print_os_info(outputStream* st) {
1992 st->print("OS:");
1993
1994 os::Solaris::print_distro_info(st);
1995
1996 os::Posix::print_uname_info(st);
1997
1998 os::Solaris::print_libversion_info(st);
1999
2000 os::Posix::print_rlimit_info(st);
2001
2002 os::Posix::print_load_average(st);
2003 }
2004
2005 void os::Solaris::print_distro_info(outputStream* st) {
2006 if (!_print_ascii_file("/etc/release", st)) {
2007 st->print("Solaris");
2008 }
2009 st->cr();
2010 }
2011
2012 void os::Solaris::print_libversion_info(outputStream* st) {
2013 if (os::Solaris::T2_libthread()) {
2014 st->print(" (T2 libthread)");
2015 }
2016 else {
2017 st->print(" (T1 libthread)");
2018 }
2019 st->cr();
2020 }
2021
2022 static bool check_addr0(outputStream* st) {
2023 jboolean status = false;
2024 int fd = ::open("/proc/self/map",O_RDONLY);
2025 if (fd >= 0) {
2026 prmap_t p;
2027 while(::read(fd, &p, sizeof(p)) > 0) {
2028 if (p.pr_vaddr == 0x0) {
2029 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2030 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2031 st->print("Access:");
2032 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2033 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2034 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2035 st->cr();
2036 status = true;
2037 }
2038 }
2039 ::close(fd);
2040 }
2041 return status;
2042 }
2043
2044 void os::pd_print_cpu_info(outputStream* st) {
2045 // Nothing to do for now.
2046 }
2047
2048 void os::print_memory_info(outputStream* st) {
2049 st->print("Memory:");
2050 st->print(" %dk page", os::vm_page_size()>>10);
2051 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2052 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2053 st->cr();
2054 if (VMError::fatal_error_in_progress()) {
2055 (void) check_addr0(st);
2056 }
2057 }
2058
2059 void os::print_siginfo(outputStream* st, void* siginfo) {
2060 const siginfo_t* si = (const siginfo_t*)siginfo;
2061
2062 os::Posix::print_siginfo_brief(st, si);
2063
2064 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2065 UseSharedSpaces) {
2066 FileMapInfo* mapinfo = FileMapInfo::current_info();
2067 if (mapinfo->is_in_shared_space(si->si_addr)) {
2068 st->print("\n\nError accessing class data sharing archive." \
2069 " Mapped file inaccessible during execution, " \
2070 " possible disk/network problem.");
2071 }
2072 }
2073 st->cr();
2074 }
2075
2076 // Moved from whole group, because we need them here for diagnostic
2077 // prints.
2078 #define OLDMAXSIGNUM 32
2079 static int Maxsignum = 0;
2080 static int *ourSigFlags = NULL;
2081
2082 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2083
2084 int os::Solaris::get_our_sigflags(int sig) {
2085 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2086 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2087 return ourSigFlags[sig];
2088 }
2089
2090 void os::Solaris::set_our_sigflags(int sig, int flags) {
2091 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2092 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2093 ourSigFlags[sig] = flags;
2094 }
2095
2096
2097 static const char* get_signal_handler_name(address handler,
2098 char* buf, int buflen) {
2099 int offset;
2100 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2101 if (found) {
2102 // skip directory names
2103 const char *p1, *p2;
2104 p1 = buf;
2105 size_t len = strlen(os::file_separator());
2106 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2107 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2108 } else {
2109 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2110 }
2111 return buf;
2112 }
2113
2114 static void print_signal_handler(outputStream* st, int sig,
2115 char* buf, size_t buflen) {
2116 struct sigaction sa;
2117
2118 sigaction(sig, NULL, &sa);
2119
2120 st->print("%s: ", os::exception_name(sig, buf, buflen));
2121
2122 address handler = (sa.sa_flags & SA_SIGINFO)
2123 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2124 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2125
2126 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2127 st->print("SIG_DFL");
2128 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2129 st->print("SIG_IGN");
2130 } else {
2131 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2132 }
2133
2134 st->print(", sa_mask[0]=");
2135 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2136
2137 address rh = VMError::get_resetted_sighandler(sig);
2138 // May be, handler was resetted by VMError?
2139 if(rh != NULL) {
2140 handler = rh;
2141 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2142 }
2143
2144 st->print(", sa_flags=");
2145 os::Posix::print_sa_flags(st, sa.sa_flags);
2146
2147 // Check: is it our handler?
2148 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2149 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2150 // It is our signal handler
2151 // check for flags
2152 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2153 st->print(
2154 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2155 os::Solaris::get_our_sigflags(sig));
2156 }
2157 }
2158 st->cr();
2159 }
2160
2161 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2162 st->print_cr("Signal Handlers:");
2163 print_signal_handler(st, SIGSEGV, buf, buflen);
2164 print_signal_handler(st, SIGBUS , buf, buflen);
2165 print_signal_handler(st, SIGFPE , buf, buflen);
2166 print_signal_handler(st, SIGPIPE, buf, buflen);
2167 print_signal_handler(st, SIGXFSZ, buf, buflen);
2168 print_signal_handler(st, SIGILL , buf, buflen);
2169 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2170 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2171 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2172 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2173 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2174 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2175 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2176 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2177 }
2178
2179 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2180
2181 // Find the full path to the current module, libjvm.so
2182 void os::jvm_path(char *buf, jint buflen) {
2183 // Error checking.
2184 if (buflen < MAXPATHLEN) {
2185 assert(false, "must use a large-enough buffer");
2186 buf[0] = '\0';
2187 return;
2188 }
2189 // Lazy resolve the path to current module.
2190 if (saved_jvm_path[0] != 0) {
2191 strcpy(buf, saved_jvm_path);
2192 return;
2193 }
2194
2195 Dl_info dlinfo;
2196 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2197 assert(ret != 0, "cannot locate libjvm");
2198 if (ret != 0 && dlinfo.dli_fname != NULL) {
2199 realpath((char *)dlinfo.dli_fname, buf);
2200 } else {
2201 buf[0] = '\0';
2202 return;
2203 }
2204
2205 if (Arguments::created_by_gamma_launcher()) {
2206 // Support for the gamma launcher. Typical value for buf is
2207 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2208 // the right place in the string, then assume we are installed in a JDK and
2209 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2210 // up the path so it looks like libjvm.so is installed there (append a
2211 // fake suffix hotspot/libjvm.so).
2212 const char *p = buf + strlen(buf) - 1;
2213 for (int count = 0; p > buf && count < 5; ++count) {
2214 for (--p; p > buf && *p != '/'; --p)
2215 /* empty */ ;
2216 }
2217
2218 if (strncmp(p, "/jre/lib/", 9) != 0) {
2219 // Look for JAVA_HOME in the environment.
2220 char* java_home_var = ::getenv("JAVA_HOME");
2221 if (java_home_var != NULL && java_home_var[0] != 0) {
2222 char cpu_arch[12];
2223 char* jrelib_p;
2224 int len;
2225 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2226 #ifdef _LP64
2227 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2228 if (strcmp(cpu_arch, "sparc") == 0) {
2229 strcat(cpu_arch, "v9");
2230 } else if (strcmp(cpu_arch, "i386") == 0) {
2231 strcpy(cpu_arch, "amd64");
2232 }
2233 #endif
2234 // Check the current module name "libjvm.so".
2235 p = strrchr(buf, '/');
2236 assert(strstr(p, "/libjvm") == p, "invalid library name");
2237
2238 realpath(java_home_var, buf);
2239 // determine if this is a legacy image or modules image
2240 // modules image doesn't have "jre" subdirectory
2241 len = strlen(buf);
2242 assert(len < buflen, "Ran out of buffer space");
2243 jrelib_p = buf + len;
2244 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2245 if (0 != access(buf, F_OK)) {
2246 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2247 }
2248
2249 if (0 == access(buf, F_OK)) {
2250 // Use current module name "libjvm.so"
2251 len = strlen(buf);
2252 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2253 } else {
2254 // Go back to path of .so
2255 realpath((char *)dlinfo.dli_fname, buf);
2256 }
2257 }
2258 }
2259 }
2260
2261 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2262 }
2263
2264
2265 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2266 // no prefix required, not even "_"
2267 }
2268
2269
2270 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2271 // no suffix required
2272 }
2273
2274 // This method is a copy of JDK's sysGetLastErrorString
2275 // from src/solaris/hpi/src/system_md.c
2276
2277 size_t os::lasterror(char *buf, size_t len) {
2278
2279 if (errno == 0) return 0;
2280
2281 const char *s = ::strerror(errno);
2282 size_t n = ::strlen(s);
2283 if (n >= len) {
2284 n = len - 1;
2285 }
2286 ::strncpy(buf, s, n);
2287 buf[n] = '\0';
2288 return n;
2289 }
2290
2291
2292 // sun.misc.Signal
2293
2294 extern "C" {
2295 static void UserHandler(int sig, void *siginfo, void *context) {
2296 // Ctrl-C is pressed during error reporting, likely because the error
2297 // handler fails to abort. Let VM die immediately.
2298 if (sig == SIGINT && is_error_reported()) {
2299 os::die();
2300 }
2301
2302 os::signal_notify(sig);
2303 // We do not need to reinstate the signal handler each time...
2304 }
2305 }
2306
2307 void* os::user_handler() {
2308 return CAST_FROM_FN_PTR(void*, UserHandler);
2309 }
2310
2311 class Semaphore : public StackObj {
2312 public:
2313 Semaphore();
2314 ~Semaphore();
2315 void signal();
2316 void wait();
2317 bool trywait();
2318 bool timedwait(unsigned int sec, int nsec);
2319 private:
2320 sema_t _semaphore;
2321 };
2322
2323
2324 Semaphore::Semaphore() {
2325 sema_init(&_semaphore, 0, NULL, NULL);
2326 }
2327
2328 Semaphore::~Semaphore() {
2329 sema_destroy(&_semaphore);
2330 }
2331
2332 void Semaphore::signal() {
2333 sema_post(&_semaphore);
2334 }
2335
2336 void Semaphore::wait() {
2337 sema_wait(&_semaphore);
2338 }
2339
2340 bool Semaphore::trywait() {
2341 return sema_trywait(&_semaphore) == 0;
2342 }
2343
2344 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2345 struct timespec ts;
2346 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2347
2348 while (1) {
2349 int result = sema_timedwait(&_semaphore, &ts);
2350 if (result == 0) {
2351 return true;
2352 } else if (errno == EINTR) {
2353 continue;
2354 } else if (errno == ETIME) {
2355 return false;
2356 } else {
2357 return false;
2358 }
2359 }
2360 }
2361
2362 extern "C" {
2363 typedef void (*sa_handler_t)(int);
2364 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2365 }
2366
2367 void* os::signal(int signal_number, void* handler) {
2368 struct sigaction sigAct, oldSigAct;
2369 sigfillset(&(sigAct.sa_mask));
2370 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2371 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2372
2373 if (sigaction(signal_number, &sigAct, &oldSigAct))
2374 // -1 means registration failed
2375 return (void *)-1;
2376
2377 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2378 }
2379
2380 void os::signal_raise(int signal_number) {
2381 raise(signal_number);
2382 }
2383
2384 /*
2385 * The following code is moved from os.cpp for making this
2386 * code platform specific, which it is by its very nature.
2387 */
2388
2389 // a counter for each possible signal value
2390 static int Sigexit = 0;
2391 static int Maxlibjsigsigs;
2392 static jint *pending_signals = NULL;
2393 static int *preinstalled_sigs = NULL;
2394 static struct sigaction *chainedsigactions = NULL;
2395 static sema_t sig_sem;
2396 typedef int (*version_getting_t)();
2397 version_getting_t os::Solaris::get_libjsig_version = NULL;
2398 static int libjsigversion = NULL;
2399
2400 int os::sigexitnum_pd() {
2401 assert(Sigexit > 0, "signal memory not yet initialized");
2402 return Sigexit;
2403 }
2404
2405 void os::Solaris::init_signal_mem() {
2406 // Initialize signal structures
2407 Maxsignum = SIGRTMAX;
2408 Sigexit = Maxsignum+1;
2409 assert(Maxsignum >0, "Unable to obtain max signal number");
2410
2411 Maxlibjsigsigs = Maxsignum;
2412
2413 // pending_signals has one int per signal
2414 // The additional signal is for SIGEXIT - exit signal to signal_thread
2415 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2416 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2417
2418 if (UseSignalChaining) {
2419 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2420 * (Maxsignum + 1), mtInternal);
2421 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2422 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2423 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2424 }
2425 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2426 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2427 }
2428
2429 void os::signal_init_pd() {
2430 int ret;
2431
2432 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2433 assert(ret == 0, "sema_init() failed");
2434 }
2435
2436 void os::signal_notify(int signal_number) {
2437 int ret;
2438
2439 Atomic::inc(&pending_signals[signal_number]);
2440 ret = ::sema_post(&sig_sem);
2441 assert(ret == 0, "sema_post() failed");
2442 }
2443
2444 static int check_pending_signals(bool wait_for_signal) {
2445 int ret;
2446 while (true) {
2447 for (int i = 0; i < Sigexit + 1; i++) {
2448 jint n = pending_signals[i];
2449 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2450 return i;
2451 }
2452 }
2453 if (!wait_for_signal) {
2454 return -1;
2455 }
2456 JavaThread *thread = JavaThread::current();
2457 ThreadBlockInVM tbivm(thread);
2458
2459 bool threadIsSuspended;
2460 do {
2461 thread->set_suspend_equivalent();
2462 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2463 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2464 ;
2465 assert(ret == 0, "sema_wait() failed");
2466
2467 // were we externally suspended while we were waiting?
2468 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2469 if (threadIsSuspended) {
2470 //
2471 // The semaphore has been incremented, but while we were waiting
2472 // another thread suspended us. We don't want to continue running
2473 // while suspended because that would surprise the thread that
2474 // suspended us.
2475 //
2476 ret = ::sema_post(&sig_sem);
2477 assert(ret == 0, "sema_post() failed");
2478
2479 thread->java_suspend_self();
2480 }
2481 } while (threadIsSuspended);
2482 }
2483 }
2484
2485 int os::signal_lookup() {
2486 return check_pending_signals(false);
2487 }
2488
2489 int os::signal_wait() {
2490 return check_pending_signals(true);
2491 }
2492
2493 ////////////////////////////////////////////////////////////////////////////////
2494 // Virtual Memory
2495
2496 static int page_size = -1;
2497
2498 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2499 // clear this var if support is not available.
2500 static bool has_map_align = true;
2501
2502 int os::vm_page_size() {
2503 assert(page_size != -1, "must call os::init");
2504 return page_size;
2505 }
2506
2507 // Solaris allocates memory by pages.
2508 int os::vm_allocation_granularity() {
2509 assert(page_size != -1, "must call os::init");
2510 return page_size;
2511 }
2512
2513 static bool recoverable_mmap_error(int err) {
2514 // See if the error is one we can let the caller handle. This
2515 // list of errno values comes from the Solaris mmap(2) man page.
2516 switch (err) {
2517 case EBADF:
2518 case EINVAL:
2519 case ENOTSUP:
2520 // let the caller deal with these errors
2521 return true;
2522
2523 default:
2524 // Any remaining errors on this OS can cause our reserved mapping
2525 // to be lost. That can cause confusion where different data
2526 // structures think they have the same memory mapped. The worst
2527 // scenario is if both the VM and a library think they have the
2528 // same memory mapped.
2529 return false;
2530 }
2531 }
2532
2533 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2534 int err) {
2535 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2536 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2537 strerror(err), err);
2538 }
2539
2540 static void warn_fail_commit_memory(char* addr, size_t bytes,
2541 size_t alignment_hint, bool exec,
2542 int err) {
2543 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2544 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2545 alignment_hint, exec, strerror(err), err);
2546 }
2547
2548 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2549 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2550 size_t size = bytes;
2551 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2552 if (res != NULL) {
2553 if (UseNUMAInterleaving) {
2554 numa_make_global(addr, bytes);
2555 }
2556 return 0;
2557 }
2558
2559 int err = errno; // save errno from mmap() call in mmap_chunk()
2560
2561 if (!recoverable_mmap_error(err)) {
2562 warn_fail_commit_memory(addr, bytes, exec, err);
2563 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2564 }
2565
2566 return err;
2567 }
2568
2569 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2570 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2571 }
2572
2573 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2574 const char* mesg) {
2575 assert(mesg != NULL, "mesg must be specified");
2576 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2577 if (err != 0) {
2578 // the caller wants all commit errors to exit with the specified mesg:
2579 warn_fail_commit_memory(addr, bytes, exec, err);
2580 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2581 }
2582 }
2583
2584 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2585 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2586 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2587 alignment, (size_t) vm_page_size()));
2588
2589 for (int i = 0; _page_sizes[i] != 0; i++) {
2590 if (is_size_aligned(alignment, _page_sizes[i])) {
2591 return _page_sizes[i];
2592 }
2593 }
2594
2595 return (size_t) vm_page_size();
2596 }
2597
2598 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2599 size_t alignment_hint, bool exec) {
2600 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2601 if (err == 0 && UseLargePages && alignment_hint > 0) {
2602 assert(is_size_aligned(bytes, alignment_hint),
2603 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint));
2604
2605 // The syscall memcntl requires an exact page size (see man memcntl for details).
2606 size_t page_size = page_size_for_alignment(alignment_hint);
2607 if (page_size > (size_t) vm_page_size()) {
2608 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2609 }
2610 }
2611 return err;
2612 }
2613
2614 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2615 bool exec) {
2616 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2617 }
2618
2619 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2620 size_t alignment_hint, bool exec,
2621 const char* mesg) {
2622 assert(mesg != NULL, "mesg must be specified");
2623 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2624 if (err != 0) {
2625 // the caller wants all commit errors to exit with the specified mesg:
2626 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2627 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2628 }
2629 }
2630
2631 // Uncommit the pages in a specified region.
2632 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2633 if (madvise(addr, bytes, MADV_FREE) < 0) {
2634 debug_only(warning("MADV_FREE failed."));
2635 return;
2636 }
2637 }
2638
2639 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2640 return os::commit_memory(addr, size, !ExecMem);
2641 }
2642
2643 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2644 return os::uncommit_memory(addr, size);
2645 }
2646
2647 // Change the page size in a given range.
2648 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2649 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2650 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2651 if (UseLargePages) {
2652 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2653 }
2654 }
2655
2656 // Tell the OS to make the range local to the first-touching LWP
2657 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2658 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2659 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2660 debug_only(warning("MADV_ACCESS_LWP failed."));
2661 }
2662 }
2663
2664 // Tell the OS that this range would be accessed from different LWPs.
2665 void os::numa_make_global(char *addr, size_t bytes) {
2666 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2667 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2668 debug_only(warning("MADV_ACCESS_MANY failed."));
2669 }
2670 }
2671
2672 // Get the number of the locality groups.
2673 size_t os::numa_get_groups_num() {
2674 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2675 return n != -1 ? n : 1;
2676 }
2677
2678 // Get a list of leaf locality groups. A leaf lgroup is group that
2679 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2680 // board. An LWP is assigned to one of these groups upon creation.
2681 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2682 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2683 ids[0] = 0;
2684 return 1;
2685 }
2686 int result_size = 0, top = 1, bottom = 0, cur = 0;
2687 for (int k = 0; k < size; k++) {
2688 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2689 (Solaris::lgrp_id_t*)&ids[top], size - top);
2690 if (r == -1) {
2691 ids[0] = 0;
2692 return 1;
2693 }
2694 if (!r) {
2695 // That's a leaf node.
2696 assert (bottom <= cur, "Sanity check");
2697 // Check if the node has memory
2698 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2699 NULL, 0, LGRP_RSRC_MEM) > 0) {
2700 ids[bottom++] = ids[cur];
2701 }
2702 }
2703 top += r;
2704 cur++;
2705 }
2706 if (bottom == 0) {
2707 // Handle a situation, when the OS reports no memory available.
2708 // Assume UMA architecture.
2709 ids[0] = 0;
2710 return 1;
2711 }
2712 return bottom;
2713 }
2714
2715 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2716 bool os::numa_topology_changed() {
2717 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2718 if (is_stale != -1 && is_stale) {
2719 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2720 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2721 assert(c != 0, "Failure to initialize LGRP API");
2722 Solaris::set_lgrp_cookie(c);
2723 return true;
2724 }
2725 return false;
2726 }
2727
2728 // Get the group id of the current LWP.
2729 int os::numa_get_group_id() {
2730 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2731 if (lgrp_id == -1) {
2732 return 0;
2733 }
2734 const int size = os::numa_get_groups_num();
2735 int *ids = (int*)alloca(size * sizeof(int));
2736
2737 // Get the ids of all lgroups with memory; r is the count.
2738 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2739 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2740 if (r <= 0) {
2741 return 0;
2742 }
2743 return ids[os::random() % r];
2744 }
2745
2746 // Request information about the page.
2747 bool os::get_page_info(char *start, page_info* info) {
2748 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2749 uint64_t addr = (uintptr_t)start;
2750 uint64_t outdata[2];
2751 uint_t validity = 0;
2752
2753 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2754 return false;
2755 }
2756
2757 info->size = 0;
2758 info->lgrp_id = -1;
2759
2760 if ((validity & 1) != 0) {
2761 if ((validity & 2) != 0) {
2762 info->lgrp_id = outdata[0];
2763 }
2764 if ((validity & 4) != 0) {
2765 info->size = outdata[1];
2766 }
2767 return true;
2768 }
2769 return false;
2770 }
2771
2772 // Scan the pages from start to end until a page different than
2773 // the one described in the info parameter is encountered.
2774 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2775 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2776 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2777 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2778 uint_t validity[MAX_MEMINFO_CNT];
2779
2780 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2781 uint64_t p = (uint64_t)start;
2782 while (p < (uint64_t)end) {
2783 addrs[0] = p;
2784 size_t addrs_count = 1;
2785 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2786 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2787 addrs_count++;
2788 }
2789
2790 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2791 return NULL;
2792 }
2793
2794 size_t i = 0;
2795 for (; i < addrs_count; i++) {
2796 if ((validity[i] & 1) != 0) {
2797 if ((validity[i] & 4) != 0) {
2798 if (outdata[types * i + 1] != page_expected->size) {
2799 break;
2800 }
2801 } else
2802 if (page_expected->size != 0) {
2803 break;
2804 }
2805
2806 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2807 if (outdata[types * i] != page_expected->lgrp_id) {
2808 break;
2809 }
2810 }
2811 } else {
2812 return NULL;
2813 }
2814 }
2815
2816 if (i < addrs_count) {
2817 if ((validity[i] & 2) != 0) {
2818 page_found->lgrp_id = outdata[types * i];
2819 } else {
2820 page_found->lgrp_id = -1;
2821 }
2822 if ((validity[i] & 4) != 0) {
2823 page_found->size = outdata[types * i + 1];
2824 } else {
2825 page_found->size = 0;
2826 }
2827 return (char*)addrs[i];
2828 }
2829
2830 p = addrs[addrs_count - 1] + page_size;
2831 }
2832 return end;
2833 }
2834
2835 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2836 size_t size = bytes;
2837 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2838 // uncommitted page. Otherwise, the read/write might succeed if we
2839 // have enough swap space to back the physical page.
2840 return
2841 NULL != Solaris::mmap_chunk(addr, size,
2842 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2843 PROT_NONE);
2844 }
2845
2846 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2847 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2848
2849 if (b == MAP_FAILED) {
2850 return NULL;
2851 }
2852 return b;
2853 }
2854
2855 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2856 char* addr = requested_addr;
2857 int flags = MAP_PRIVATE | MAP_NORESERVE;
2858
2859 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2860
2861 if (fixed) {
2862 flags |= MAP_FIXED;
2863 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2864 flags |= MAP_ALIGN;
2865 addr = (char*) alignment_hint;
2866 }
2867
2868 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2869 // uncommitted page. Otherwise, the read/write might succeed if we
2870 // have enough swap space to back the physical page.
2871 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2872 }
2873
2874 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2875 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2876
2877 guarantee(requested_addr == NULL || requested_addr == addr,
2878 "OS failed to return requested mmap address.");
2879 return addr;
2880 }
2881
2882 // Reserve memory at an arbitrary address, only if that area is
2883 // available (and not reserved for something else).
2884
2885 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2886 const int max_tries = 10;
2887 char* base[max_tries];
2888 size_t size[max_tries];
2889
2890 // Solaris adds a gap between mmap'ed regions. The size of the gap
2891 // is dependent on the requested size and the MMU. Our initial gap
2892 // value here is just a guess and will be corrected later.
2893 bool had_top_overlap = false;
2894 bool have_adjusted_gap = false;
2895 size_t gap = 0x400000;
2896
2897 // Assert only that the size is a multiple of the page size, since
2898 // that's all that mmap requires, and since that's all we really know
2899 // about at this low abstraction level. If we need higher alignment,
2900 // we can either pass an alignment to this method or verify alignment
2901 // in one of the methods further up the call chain. See bug 5044738.
2902 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2903
2904 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2905 // Give it a try, if the kernel honors the hint we can return immediately.
2906 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2907
2908 volatile int err = errno;
2909 if (addr == requested_addr) {
2910 return addr;
2911 } else if (addr != NULL) {
2912 pd_unmap_memory(addr, bytes);
2913 }
2914
2915 if (PrintMiscellaneous && Verbose) {
2916 char buf[256];
2917 buf[0] = '\0';
2918 if (addr == NULL) {
2919 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2920 }
2921 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2922 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2923 "%s", bytes, requested_addr, addr, buf);
2924 }
2925
2926 // Address hint method didn't work. Fall back to the old method.
2927 // In theory, once SNV becomes our oldest supported platform, this
2928 // code will no longer be needed.
2929 //
2930 // Repeatedly allocate blocks until the block is allocated at the
2931 // right spot. Give up after max_tries.
2932 int i;
2933 for (i = 0; i < max_tries; ++i) {
2934 base[i] = reserve_memory(bytes);
2935
2936 if (base[i] != NULL) {
2937 // Is this the block we wanted?
2938 if (base[i] == requested_addr) {
2939 size[i] = bytes;
2940 break;
2941 }
2942
2943 // check that the gap value is right
2944 if (had_top_overlap && !have_adjusted_gap) {
2945 size_t actual_gap = base[i-1] - base[i] - bytes;
2946 if (gap != actual_gap) {
2947 // adjust the gap value and retry the last 2 allocations
2948 assert(i > 0, "gap adjustment code problem");
2949 have_adjusted_gap = true; // adjust the gap only once, just in case
2950 gap = actual_gap;
2951 if (PrintMiscellaneous && Verbose) {
2952 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2953 }
2954 unmap_memory(base[i], bytes);
2955 unmap_memory(base[i-1], size[i-1]);
2956 i-=2;
2957 continue;
2958 }
2959 }
2960
2961 // Does this overlap the block we wanted? Give back the overlapped
2962 // parts and try again.
2963 //
2964 // There is still a bug in this code: if top_overlap == bytes,
2965 // the overlap is offset from requested region by the value of gap.
2966 // In this case giving back the overlapped part will not work,
2967 // because we'll give back the entire block at base[i] and
2968 // therefore the subsequent allocation will not generate a new gap.
2969 // This could be fixed with a new algorithm that used larger
2970 // or variable size chunks to find the requested region -
2971 // but such a change would introduce additional complications.
2972 // It's rare enough that the planets align for this bug,
2973 // so we'll just wait for a fix for 6204603/5003415 which
2974 // will provide a mmap flag to allow us to avoid this business.
2975
2976 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2977 if (top_overlap >= 0 && top_overlap < bytes) {
2978 had_top_overlap = true;
2979 unmap_memory(base[i], top_overlap);
2980 base[i] += top_overlap;
2981 size[i] = bytes - top_overlap;
2982 } else {
2983 size_t bottom_overlap = base[i] + bytes - requested_addr;
2984 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2985 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2986 warning("attempt_reserve_memory_at: possible alignment bug");
2987 }
2988 unmap_memory(requested_addr, bottom_overlap);
2989 size[i] = bytes - bottom_overlap;
2990 } else {
2991 size[i] = bytes;
2992 }
2993 }
2994 }
2995 }
2996
2997 // Give back the unused reserved pieces.
2998
2999 for (int j = 0; j < i; ++j) {
3000 if (base[j] != NULL) {
3001 unmap_memory(base[j], size[j]);
3002 }
3003 }
3004
3005 return (i < max_tries) ? requested_addr : NULL;
3006 }
3007
3008 bool os::pd_release_memory(char* addr, size_t bytes) {
3009 size_t size = bytes;
3010 return munmap(addr, size) == 0;
3011 }
3012
3013 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3014 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3015 "addr must be page aligned");
3016 int retVal = mprotect(addr, bytes, prot);
3017 return retVal == 0;
3018 }
3019
3020 // Protect memory (Used to pass readonly pages through
3021 // JNI GetArray<type>Elements with empty arrays.)
3022 // Also, used for serialization page and for compressed oops null pointer
3023 // checking.
3024 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3025 bool is_committed) {
3026 unsigned int p = 0;
3027 switch (prot) {
3028 case MEM_PROT_NONE: p = PROT_NONE; break;
3029 case MEM_PROT_READ: p = PROT_READ; break;
3030 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3031 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3032 default:
3033 ShouldNotReachHere();
3034 }
3035 // is_committed is unused.
3036 return solaris_mprotect(addr, bytes, p);
3037 }
3038
3039 // guard_memory and unguard_memory only happens within stack guard pages.
3040 // Since ISM pertains only to the heap, guard and unguard memory should not
3041 /// happen with an ISM region.
3042 bool os::guard_memory(char* addr, size_t bytes) {
3043 return solaris_mprotect(addr, bytes, PROT_NONE);
3044 }
3045
3046 bool os::unguard_memory(char* addr, size_t bytes) {
3047 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3048 }
3049
3050 // Large page support
3051 static size_t _large_page_size = 0;
3052
3053 // Insertion sort for small arrays (descending order).
3054 static void insertion_sort_descending(size_t* array, int len) {
3055 for (int i = 0; i < len; i++) {
3056 size_t val = array[i];
3057 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3058 size_t tmp = array[key];
3059 array[key] = array[key - 1];
3060 array[key - 1] = tmp;
3061 }
3062 }
3063 }
3064
3065 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3066 const unsigned int usable_count = VM_Version::page_size_count();
3067 if (usable_count == 1) {
3068 return false;
3069 }
3070
3071 // Find the right getpagesizes interface. When solaris 11 is the minimum
3072 // build platform, getpagesizes() (without the '2') can be called directly.
3073 typedef int (*gps_t)(size_t[], int);
3074 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3075 if (gps_func == NULL) {
3076 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3077 if (gps_func == NULL) {
3078 if (warn) {
3079 warning("MPSS is not supported by the operating system.");
3080 }
3081 return false;
3082 }
3083 }
3084
3085 // Fill the array of page sizes.
3086 int n = (*gps_func)(_page_sizes, page_sizes_max);
3087 assert(n > 0, "Solaris bug?");
3088
3089 if (n == page_sizes_max) {
3090 // Add a sentinel value (necessary only if the array was completely filled
3091 // since it is static (zeroed at initialization)).
3092 _page_sizes[--n] = 0;
3093 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3094 }
3095 assert(_page_sizes[n] == 0, "missing sentinel");
3096 trace_page_sizes("available page sizes", _page_sizes, n);
3097
3098 if (n == 1) return false; // Only one page size available.
3099
3100 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3101 // select up to usable_count elements. First sort the array, find the first
3102 // acceptable value, then copy the usable sizes to the top of the array and
3103 // trim the rest. Make sure to include the default page size :-).
3104 //
3105 // A better policy could get rid of the 4M limit by taking the sizes of the
3106 // important VM memory regions (java heap and possibly the code cache) into
3107 // account.
3108 insertion_sort_descending(_page_sizes, n);
3109 const size_t size_limit =
3110 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3111 int beg;
3112 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3113 const int end = MIN2((int)usable_count, n) - 1;
3114 for (int cur = 0; cur < end; ++cur, ++beg) {
3115 _page_sizes[cur] = _page_sizes[beg];
3116 }
3117 _page_sizes[end] = vm_page_size();
3118 _page_sizes[end + 1] = 0;
3119
3120 if (_page_sizes[end] > _page_sizes[end - 1]) {
3121 // Default page size is not the smallest; sort again.
3122 insertion_sort_descending(_page_sizes, end + 1);
3123 }
3124 *page_size = _page_sizes[0];
3125
3126 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3127 return true;
3128 }
3129
3130 void os::large_page_init() {
3131 if (UseLargePages) {
3132 // print a warning if any large page related flag is specified on command line
3133 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3134 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3135
3136 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3137 }
3138 }
3139
3140 bool os::Solaris::is_valid_page_size(size_t bytes) {
3141 for (int i = 0; _page_sizes[i] != 0; i++) {
3142 if (_page_sizes[i] == bytes) {
3143 return true;
3144 }
3145 }
3146 return false;
3147 }
3148
3149 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3150 assert(is_valid_page_size(align), err_msg(SIZE_FORMAT " is not a valid page size", align));
3151 assert(is_ptr_aligned((void*) start, align),
3152 err_msg(PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align));
3153 assert(is_size_aligned(bytes, align),
3154 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align));
3155
3156 // Signal to OS that we want large pages for addresses
3157 // from addr, addr + bytes
3158 struct memcntl_mha mpss_struct;
3159 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3160 mpss_struct.mha_pagesize = align;
3161 mpss_struct.mha_flags = 0;
3162 // Upon successful completion, memcntl() returns 0
3163 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3164 debug_only(warning("Attempt to use MPSS failed."));
3165 return false;
3166 }
3167 return true;
3168 }
3169
3170 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3171 fatal("os::reserve_memory_special should not be called on Solaris.");
3172 return NULL;
3173 }
3174
3175 bool os::release_memory_special(char* base, size_t bytes) {
3176 fatal("os::release_memory_special should not be called on Solaris.");
3177 return false;
3178 }
3179
3180 size_t os::large_page_size() {
3181 return _large_page_size;
3182 }
3183
3184 // MPSS allows application to commit large page memory on demand; with ISM
3185 // the entire memory region must be allocated as shared memory.
3186 bool os::can_commit_large_page_memory() {
3187 return true;
3188 }
3189
3190 bool os::can_execute_large_page_memory() {
3191 return true;
3192 }
3193
3194 static int os_sleep(jlong millis, bool interruptible) {
3195 const jlong limit = INT_MAX;
3196 jlong prevtime;
3197 int res;
3198
3199 while (millis > limit) {
3200 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3201 return res;
3202 millis -= limit;
3203 }
3204
3205 // Restart interrupted polls with new parameters until the proper delay
3206 // has been completed.
3207
3208 prevtime = getTimeMillis();
3209
3210 while (millis > 0) {
3211 jlong newtime;
3212
3213 if (!interruptible) {
3214 // Following assert fails for os::yield_all:
3215 // assert(!thread->is_Java_thread(), "must not be java thread");
3216 res = poll(NULL, 0, millis);
3217 } else {
3218 JavaThread *jt = JavaThread::current();
3219
3220 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3221 os::Solaris::clear_interrupted);
3222 }
3223
3224 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3225 // thread.Interrupt.
3226
3227 // See c/r 6751923. Poll can return 0 before time
3228 // has elapsed if time is set via clock_settime (as NTP does).
3229 // res == 0 if poll timed out (see man poll RETURN VALUES)
3230 // using the logic below checks that we really did
3231 // sleep at least "millis" if not we'll sleep again.
3232 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3233 newtime = getTimeMillis();
3234 assert(newtime >= prevtime, "time moving backwards");
3235 /* Doing prevtime and newtime in microseconds doesn't help precision,
3236 and trying to round up to avoid lost milliseconds can result in a
3237 too-short delay. */
3238 millis -= newtime - prevtime;
3239 if(millis <= 0)
3240 return OS_OK;
3241 prevtime = newtime;
3242 } else
3243 return res;
3244 }
3245
3246 return OS_OK;
3247 }
3248
3249 // Read calls from inside the vm need to perform state transitions
3250 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3251 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3252 }
3253
3254 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3255 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3256 }
3257
3258 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3259 assert(thread == Thread::current(), "thread consistency check");
3260
3261 // TODO-FIXME: this should be removed.
3262 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3263 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3264 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3265 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3266 // is fooled into believing that the system is making progress. In the code below we block the
3267 // the watcher thread while safepoint is in progress so that it would not appear as though the
3268 // system is making progress.
3269 if (!Solaris::T2_libthread() &&
3270 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3271 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3272 // the entire safepoint, the watcher thread will line up here during the safepoint.
3273 Threads_lock->lock_without_safepoint_check();
3274 Threads_lock->unlock();
3275 }
3276
3277 if (thread->is_Java_thread()) {
3278 // This is a JavaThread so we honor the _thread_blocked protocol
3279 // even for sleeps of 0 milliseconds. This was originally done
3280 // as a workaround for bug 4338139. However, now we also do it
3281 // to honor the suspend-equivalent protocol.
3282
3283 JavaThread *jt = (JavaThread *) thread;
3284 ThreadBlockInVM tbivm(jt);
3285
3286 jt->set_suspend_equivalent();
3287 // cleared by handle_special_suspend_equivalent_condition() or
3288 // java_suspend_self() via check_and_wait_while_suspended()
3289
3290 int ret_code;
3291 if (millis <= 0) {
3292 thr_yield();
3293 ret_code = 0;
3294 } else {
3295 // The original sleep() implementation did not create an
3296 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3297 // I'm preserving that decision for now.
3298 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3299
3300 ret_code = os_sleep(millis, interruptible);
3301 }
3302
3303 // were we externally suspended while we were waiting?
3304 jt->check_and_wait_while_suspended();
3305
3306 return ret_code;
3307 }
3308
3309 // non-JavaThread from this point on:
3310
3311 if (millis <= 0) {
3312 thr_yield();
3313 return 0;
3314 }
3315
3316 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3317
3318 return os_sleep(millis, interruptible);
3319 }
3320
3321 void os::naked_short_sleep(jlong ms) {
3322 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3323
3324 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3325 // Solaris requires -lrt for this.
3326 usleep((ms * 1000));
3327
3328 return;
3329 }
3330
3331 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3332 void os::infinite_sleep() {
3333 while (true) { // sleep forever ...
3334 ::sleep(100); // ... 100 seconds at a time
3335 }
3336 }
3337
3338 // Used to convert frequent JVM_Yield() to nops
3339 bool os::dont_yield() {
3340 if (DontYieldALot) {
3341 static hrtime_t last_time = 0;
3342 hrtime_t diff = getTimeNanos() - last_time;
3343
3344 if (diff < DontYieldALotInterval * 1000000)
3345 return true;
3346
3347 last_time += diff;
3348
3349 return false;
3350 }
3351 else {
3352 return false;
3353 }
3354 }
3355
3356 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3357 // the linux and win32 implementations do not. This should be checked.
3358
3359 void os::yield() {
3360 // Yields to all threads with same or greater priority
3361 os::sleep(Thread::current(), 0, false);
3362 }
3363
3364 // Note that yield semantics are defined by the scheduling class to which
3365 // the thread currently belongs. Typically, yield will _not yield to
3366 // other equal or higher priority threads that reside on the dispatch queues
3367 // of other CPUs.
3368
3369 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3370
3371
3372 // On Solaris we found that yield_all doesn't always yield to all other threads.
3373 // There have been cases where there is a thread ready to execute but it doesn't
3374 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3375 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3376 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3377 // number of times yield_all is called in the one loop and increase the sleep
3378 // time after 8 attempts. If this fails too we increase the concurrency level
3379 // so that the starving thread would get an lwp
3380
3381 void os::yield_all(int attempts) {
3382 // Yields to all threads, including threads with lower priorities
3383 if (attempts == 0) {
3384 os::sleep(Thread::current(), 1, false);
3385 } else {
3386 int iterations = attempts % 30;
3387 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3388 // thr_setconcurrency and _getconcurrency make sense only under T1.
3389 int noofLWPS = thr_getconcurrency();
3390 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3391 thr_setconcurrency(thr_getconcurrency() + 1);
3392 }
3393 } else if (iterations < 25) {
3394 os::sleep(Thread::current(), 1, false);
3395 } else {
3396 os::sleep(Thread::current(), 10, false);
3397 }
3398 }
3399 }
3400
3401 // Called from the tight loops to possibly influence time-sharing heuristics
3402 void os::loop_breaker(int attempts) {
3403 os::yield_all(attempts);
3404 }
3405
3406
3407 // Interface for setting lwp priorities. If we are using T2 libthread,
3408 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3409 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3410 // function is meaningless in this mode so we must adjust the real lwp's priority
3411 // The routines below implement the getting and setting of lwp priorities.
3412 //
3413 // Note: There are three priority scales used on Solaris. Java priotities
3414 // which range from 1 to 10, libthread "thr_setprio" scale which range
3415 // from 0 to 127, and the current scheduling class of the process we
3416 // are running in. This is typically from -60 to +60.
3417 // The setting of the lwp priorities in done after a call to thr_setprio
3418 // so Java priorities are mapped to libthread priorities and we map from
3419 // the latter to lwp priorities. We don't keep priorities stored in
3420 // Java priorities since some of our worker threads want to set priorities
3421 // higher than all Java threads.
3422 //
3423 // For related information:
3424 // (1) man -s 2 priocntl
3425 // (2) man -s 4 priocntl
3426 // (3) man dispadmin
3427 // = librt.so
3428 // = libthread/common/rtsched.c - thrp_setlwpprio().
3429 // = ps -cL <pid> ... to validate priority.
3430 // = sched_get_priority_min and _max
3431 // pthread_create
3432 // sched_setparam
3433 // pthread_setschedparam
3434 //
3435 // Assumptions:
3436 // + We assume that all threads in the process belong to the same
3437 // scheduling class. IE. an homogenous process.
3438 // + Must be root or in IA group to change change "interactive" attribute.
3439 // Priocntl() will fail silently. The only indication of failure is when
3440 // we read-back the value and notice that it hasn't changed.
3441 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3442 // + For RT, change timeslice as well. Invariant:
3443 // constant "priority integral"
3444 // Konst == TimeSlice * (60-Priority)
3445 // Given a priority, compute appropriate timeslice.
3446 // + Higher numerical values have higher priority.
3447
3448 // sched class attributes
3449 typedef struct {
3450 int schedPolicy; // classID
3451 int maxPrio;
3452 int minPrio;
3453 } SchedInfo;
3454
3455
3456 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3457
3458 #ifdef ASSERT
3459 static int ReadBackValidate = 1;
3460 #endif
3461 static int myClass = 0;
3462 static int myMin = 0;
3463 static int myMax = 0;
3464 static int myCur = 0;
3465 static bool priocntl_enable = false;
3466
3467 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3468 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3469
3470
3471 // lwp_priocntl_init
3472 //
3473 // Try to determine the priority scale for our process.
3474 //
3475 // Return errno or 0 if OK.
3476 //
3477 static int lwp_priocntl_init () {
3478 int rslt;
3479 pcinfo_t ClassInfo;
3480 pcparms_t ParmInfo;
3481 int i;
3482
3483 if (!UseThreadPriorities) return 0;
3484
3485 // We are using Bound threads, we need to determine our priority ranges
3486 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3487 // If ThreadPriorityPolicy is 1, switch tables
3488 if (ThreadPriorityPolicy == 1) {
3489 for (i = 0 ; i < CriticalPriority+1; i++)
3490 os::java_to_os_priority[i] = prio_policy1[i];
3491 }
3492 if (UseCriticalJavaThreadPriority) {
3493 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3494 // See set_native_priority() and set_lwp_class_and_priority().
3495 // Save original MaxPriority mapping in case attempt to
3496 // use critical priority fails.
3497 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3498 // Set negative to distinguish from other priorities
3499 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3500 }
3501 }
3502 // Not using Bound Threads, set to ThreadPolicy 1
3503 else {
3504 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3505 os::java_to_os_priority[i] = prio_policy1[i];
3506 }
3507 return 0;
3508 }
3509
3510 // Get IDs for a set of well-known scheduling classes.
3511 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3512 // the system. We should have a loop that iterates over the
3513 // classID values, which are known to be "small" integers.
3514
3515 strcpy(ClassInfo.pc_clname, "TS");
3516 ClassInfo.pc_cid = -1;
3517 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3518 if (rslt < 0) return errno;
3519 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3520 tsLimits.schedPolicy = ClassInfo.pc_cid;
3521 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3522 tsLimits.minPrio = -tsLimits.maxPrio;
3523
3524 strcpy(ClassInfo.pc_clname, "IA");
3525 ClassInfo.pc_cid = -1;
3526 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3527 if (rslt < 0) return errno;
3528 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3529 iaLimits.schedPolicy = ClassInfo.pc_cid;
3530 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3531 iaLimits.minPrio = -iaLimits.maxPrio;
3532
3533 strcpy(ClassInfo.pc_clname, "RT");
3534 ClassInfo.pc_cid = -1;
3535 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3536 if (rslt < 0) return errno;
3537 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3538 rtLimits.schedPolicy = ClassInfo.pc_cid;
3539 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3540 rtLimits.minPrio = 0;
3541
3542 strcpy(ClassInfo.pc_clname, "FX");
3543 ClassInfo.pc_cid = -1;
3544 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3545 if (rslt < 0) return errno;
3546 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3547 fxLimits.schedPolicy = ClassInfo.pc_cid;
3548 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3549 fxLimits.minPrio = 0;
3550
3551 // Query our "current" scheduling class.
3552 // This will normally be IA, TS or, rarely, FX or RT.
3553 memset(&ParmInfo, 0, sizeof(ParmInfo));
3554 ParmInfo.pc_cid = PC_CLNULL;
3555 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3556 if (rslt < 0) return errno;
3557 myClass = ParmInfo.pc_cid;
3558
3559 // We now know our scheduling classId, get specific information
3560 // about the class.
3561 ClassInfo.pc_cid = myClass;
3562 ClassInfo.pc_clname[0] = 0;
3563 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3564 if (rslt < 0) return errno;
3565
3566 if (ThreadPriorityVerbose) {
3567 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3568 }
3569
3570 memset(&ParmInfo, 0, sizeof(pcparms_t));
3571 ParmInfo.pc_cid = PC_CLNULL;
3572 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3573 if (rslt < 0) return errno;
3574
3575 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3576 myMin = rtLimits.minPrio;
3577 myMax = rtLimits.maxPrio;
3578 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3579 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3580 myMin = iaLimits.minPrio;
3581 myMax = iaLimits.maxPrio;
3582 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3583 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3584 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3585 myMin = tsLimits.minPrio;
3586 myMax = tsLimits.maxPrio;
3587 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3588 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3589 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3590 myMin = fxLimits.minPrio;
3591 myMax = fxLimits.maxPrio;
3592 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3593 } else {
3594 // No clue - punt
3595 if (ThreadPriorityVerbose)
3596 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3597 return EINVAL; // no clue, punt
3598 }
3599
3600 if (ThreadPriorityVerbose) {
3601 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3602 }
3603
3604 priocntl_enable = true; // Enable changing priorities
3605 return 0;
3606 }
3607
3608 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3609 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3610 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3611 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3612
3613
3614 // scale_to_lwp_priority
3615 //
3616 // Convert from the libthread "thr_setprio" scale to our current
3617 // lwp scheduling class scale.
3618 //
3619 static
3620 int scale_to_lwp_priority (int rMin, int rMax, int x)
3621 {
3622 int v;
3623
3624 if (x == 127) return rMax; // avoid round-down
3625 v = (((x*(rMax-rMin)))/128)+rMin;
3626 return v;
3627 }
3628
3629
3630 // set_lwp_class_and_priority
3631 //
3632 // Set the class and priority of the lwp. This call should only
3633 // be made when using bound threads (T2 threads are bound by default).
3634 //
3635 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3636 int newPrio, int new_class, bool scale) {
3637 int rslt;
3638 int Actual, Expected, prv;
3639 pcparms_t ParmInfo; // for GET-SET
3640 #ifdef ASSERT
3641 pcparms_t ReadBack; // for readback
3642 #endif
3643
3644 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3645 // Query current values.
3646 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3647 // Cache "pcparms_t" in global ParmCache.
3648 // TODO: elide set-to-same-value
3649
3650 // If something went wrong on init, don't change priorities.
3651 if ( !priocntl_enable ) {
3652 if (ThreadPriorityVerbose)
3653 tty->print_cr("Trying to set priority but init failed, ignoring");
3654 return EINVAL;
3655 }
3656
3657 // If lwp hasn't started yet, just return
3658 // the _start routine will call us again.
3659 if ( lwpid <= 0 ) {
3660 if (ThreadPriorityVerbose) {
3661 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3662 INTPTR_FORMAT " to %d, lwpid not set",
3663 ThreadID, newPrio);
3664 }
3665 return 0;
3666 }
3667
3668 if (ThreadPriorityVerbose) {
3669 tty->print_cr ("set_lwp_class_and_priority("
3670 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3671 ThreadID, lwpid, newPrio);
3672 }
3673
3674 memset(&ParmInfo, 0, sizeof(pcparms_t));
3675 ParmInfo.pc_cid = PC_CLNULL;
3676 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3677 if (rslt < 0) return errno;
3678
3679 int cur_class = ParmInfo.pc_cid;
3680 ParmInfo.pc_cid = (id_t)new_class;
3681
3682 if (new_class == rtLimits.schedPolicy) {
3683 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3684 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3685 rtLimits.maxPrio, newPrio)
3686 : newPrio;
3687 rtInfo->rt_tqsecs = RT_NOCHANGE;
3688 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3689 if (ThreadPriorityVerbose) {
3690 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3691 }
3692 } else if (new_class == iaLimits.schedPolicy) {
3693 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3694 int maxClamped = MIN2(iaLimits.maxPrio,
3695 cur_class == new_class
3696 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3697 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3698 maxClamped, newPrio)
3699 : newPrio;
3700 iaInfo->ia_uprilim = cur_class == new_class
3701 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3702 iaInfo->ia_mode = IA_NOCHANGE;
3703 if (ThreadPriorityVerbose) {
3704 tty->print_cr("IA: [%d...%d] %d->%d\n",
3705 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3706 }
3707 } else if (new_class == tsLimits.schedPolicy) {
3708 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3709 int maxClamped = MIN2(tsLimits.maxPrio,
3710 cur_class == new_class
3711 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3712 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3713 maxClamped, newPrio)
3714 : newPrio;
3715 tsInfo->ts_uprilim = cur_class == new_class
3716 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3717 if (ThreadPriorityVerbose) {
3718 tty->print_cr("TS: [%d...%d] %d->%d\n",
3719 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3720 }
3721 } else if (new_class == fxLimits.schedPolicy) {
3722 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3723 int maxClamped = MIN2(fxLimits.maxPrio,
3724 cur_class == new_class
3725 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3726 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3727 maxClamped, newPrio)
3728 : newPrio;
3729 fxInfo->fx_uprilim = cur_class == new_class
3730 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3731 fxInfo->fx_tqsecs = FX_NOCHANGE;
3732 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3733 if (ThreadPriorityVerbose) {
3734 tty->print_cr("FX: [%d...%d] %d->%d\n",
3735 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3736 }
3737 } else {
3738 if (ThreadPriorityVerbose) {
3739 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3740 }
3741 return EINVAL; // no clue, punt
3742 }
3743
3744 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3745 if (ThreadPriorityVerbose && rslt) {
3746 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3747 }
3748 if (rslt < 0) return errno;
3749
3750 #ifdef ASSERT
3751 // Sanity check: read back what we just attempted to set.
3752 // In theory it could have changed in the interim ...
3753 //
3754 // The priocntl system call is tricky.
3755 // Sometimes it'll validate the priority value argument and
3756 // return EINVAL if unhappy. At other times it fails silently.
3757 // Readbacks are prudent.
3758
3759 if (!ReadBackValidate) return 0;
3760
3761 memset(&ReadBack, 0, sizeof(pcparms_t));
3762 ReadBack.pc_cid = PC_CLNULL;
3763 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3764 assert(rslt >= 0, "priocntl failed");
3765 Actual = Expected = 0xBAD;
3766 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3767 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3768 Actual = RTPRI(ReadBack)->rt_pri;
3769 Expected = RTPRI(ParmInfo)->rt_pri;
3770 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3771 Actual = IAPRI(ReadBack)->ia_upri;
3772 Expected = IAPRI(ParmInfo)->ia_upri;
3773 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3774 Actual = TSPRI(ReadBack)->ts_upri;
3775 Expected = TSPRI(ParmInfo)->ts_upri;
3776 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3777 Actual = FXPRI(ReadBack)->fx_upri;
3778 Expected = FXPRI(ParmInfo)->fx_upri;
3779 } else {
3780 if (ThreadPriorityVerbose) {
3781 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3782 ParmInfo.pc_cid);
3783 }
3784 }
3785
3786 if (Actual != Expected) {
3787 if (ThreadPriorityVerbose) {
3788 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3789 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3790 }
3791 }
3792 #endif
3793
3794 return 0;
3795 }
3796
3797 // Solaris only gives access to 128 real priorities at a time,
3798 // so we expand Java's ten to fill this range. This would be better
3799 // if we dynamically adjusted relative priorities.
3800 //
3801 // The ThreadPriorityPolicy option allows us to select 2 different
3802 // priority scales.
3803 //
3804 // ThreadPriorityPolicy=0
3805 // Since the Solaris' default priority is MaximumPriority, we do not
3806 // set a priority lower than Max unless a priority lower than
3807 // NormPriority is requested.
3808 //
3809 // ThreadPriorityPolicy=1
3810 // This mode causes the priority table to get filled with
3811 // linear values. NormPriority get's mapped to 50% of the
3812 // Maximum priority an so on. This will cause VM threads
3813 // to get unfair treatment against other Solaris processes
3814 // which do not explicitly alter their thread priorities.
3815 //
3816
3817 int os::java_to_os_priority[CriticalPriority + 1] = {
3818 -99999, // 0 Entry should never be used
3819
3820 0, // 1 MinPriority
3821 32, // 2
3822 64, // 3
3823
3824 96, // 4
3825 127, // 5 NormPriority
3826 127, // 6
3827
3828 127, // 7
3829 127, // 8
3830 127, // 9 NearMaxPriority
3831
3832 127, // 10 MaxPriority
3833
3834 -criticalPrio // 11 CriticalPriority
3835 };
3836
3837 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3838 OSThread* osthread = thread->osthread();
3839
3840 // Save requested priority in case the thread hasn't been started
3841 osthread->set_native_priority(newpri);
3842
3843 // Check for critical priority request
3844 bool fxcritical = false;
3845 if (newpri == -criticalPrio) {
3846 fxcritical = true;
3847 newpri = criticalPrio;
3848 }
3849
3850 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3851 if (!UseThreadPriorities) return OS_OK;
3852
3853 int status = 0;
3854
3855 if (!fxcritical) {
3856 // Use thr_setprio only if we have a priority that thr_setprio understands
3857 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3858 }
3859
3860 if (os::Solaris::T2_libthread() ||
3861 (UseBoundThreads && osthread->is_vm_created())) {
3862 int lwp_status =
3863 set_lwp_class_and_priority(osthread->thread_id(),
3864 osthread->lwp_id(),
3865 newpri,
3866 fxcritical ? fxLimits.schedPolicy : myClass,
3867 !fxcritical);
3868 if (lwp_status != 0 && fxcritical) {
3869 // Try again, this time without changing the scheduling class
3870 newpri = java_MaxPriority_to_os_priority;
3871 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3872 osthread->lwp_id(),
3873 newpri, myClass, false);
3874 }
3875 status |= lwp_status;
3876 }
3877 return (status == 0) ? OS_OK : OS_ERR;
3878 }
3879
3880
3881 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3882 int p;
3883 if ( !UseThreadPriorities ) {
3884 *priority_ptr = NormalPriority;
3885 return OS_OK;
3886 }
3887 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3888 if (status != 0) {
3889 return OS_ERR;
3890 }
3891 *priority_ptr = p;
3892 return OS_OK;
3893 }
3894
3895
3896 // Hint to the underlying OS that a task switch would not be good.
3897 // Void return because it's a hint and can fail.
3898 void os::hint_no_preempt() {
3899 schedctl_start(schedctl_init());
3900 }
3901
3902 static void resume_clear_context(OSThread *osthread) {
3903 osthread->set_ucontext(NULL);
3904 }
3905
3906 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3907 osthread->set_ucontext(context);
3908 }
3909
3910 static Semaphore sr_semaphore;
3911
3912 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3913 // Save and restore errno to avoid confusing native code with EINTR
3914 // after sigsuspend.
3915 int old_errno = errno;
3916
3917 OSThread* osthread = thread->osthread();
3918 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3919
3920 os::SuspendResume::State current = osthread->sr.state();
3921 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3922 suspend_save_context(osthread, uc);
3923
3924 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3925 os::SuspendResume::State state = osthread->sr.suspended();
3926 if (state == os::SuspendResume::SR_SUSPENDED) {
3927 sigset_t suspend_set; // signals for sigsuspend()
3928
3929 // get current set of blocked signals and unblock resume signal
3930 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3931 sigdelset(&suspend_set, os::Solaris::SIGasync());
3932
3933 sr_semaphore.signal();
3934 // wait here until we are resumed
3935 while (1) {
3936 sigsuspend(&suspend_set);
3937
3938 os::SuspendResume::State result = osthread->sr.running();
3939 if (result == os::SuspendResume::SR_RUNNING) {
3940 sr_semaphore.signal();
3941 break;
3942 }
3943 }
3944
3945 } else if (state == os::SuspendResume::SR_RUNNING) {
3946 // request was cancelled, continue
3947 } else {
3948 ShouldNotReachHere();
3949 }
3950
3951 resume_clear_context(osthread);
3952 } else if (current == os::SuspendResume::SR_RUNNING) {
3953 // request was cancelled, continue
3954 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3955 // ignore
3956 } else {
3957 // ignore
3958 }
3959
3960 errno = old_errno;
3961 }
3962
3963
3964 void os::interrupt(Thread* thread) {
3965 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3966
3967 OSThread* osthread = thread->osthread();
3968
3969 int isInterrupted = osthread->interrupted();
3970 if (!isInterrupted) {
3971 osthread->set_interrupted(true);
3972 OrderAccess::fence();
3973 // os::sleep() is implemented with either poll (NULL,0,timeout) or
3974 // by parking on _SleepEvent. If the former, thr_kill will unwedge
3975 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
3976 ParkEvent * const slp = thread->_SleepEvent ;
3977 if (slp != NULL) slp->unpark() ;
3978 }
3979
3980 // For JSR166: unpark after setting status but before thr_kill -dl
3981 if (thread->is_Java_thread()) {
3982 ((JavaThread*)thread)->parker()->unpark();
3983 }
3984
3985 // Handle interruptible wait() ...
3986 ParkEvent * const ev = thread->_ParkEvent ;
3987 if (ev != NULL) ev->unpark() ;
3988
3989 // When events are used everywhere for os::sleep, then this thr_kill
3990 // will only be needed if UseVMInterruptibleIO is true.
3991
3992 if (!isInterrupted) {
3993 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
3994 assert_status(status == 0, status, "thr_kill");
3995
3996 // Bump thread interruption counter
3997 RuntimeService::record_thread_interrupt_signaled_count();
3998 }
3999 }
4000
4001
4002 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4003 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4004
4005 OSThread* osthread = thread->osthread();
4006
4007 bool res = osthread->interrupted();
4008
4009 // NOTE that since there is no "lock" around these two operations,
4010 // there is the possibility that the interrupted flag will be
4011 // "false" but that the interrupt event will be set. This is
4012 // intentional. The effect of this is that Object.wait() will appear
4013 // to have a spurious wakeup, which is not harmful, and the
4014 // possibility is so rare that it is not worth the added complexity
4015 // to add yet another lock. It has also been recommended not to put
4016 // the interrupted flag into the os::Solaris::Event structure,
4017 // because it hides the issue.
4018 if (res && clear_interrupted) {
4019 osthread->set_interrupted(false);
4020 }
4021 return res;
4022 }
4023
4024
4025 void os::print_statistics() {
4026 }
4027
4028 int os::message_box(const char* title, const char* message) {
4029 int i;
4030 fdStream err(defaultStream::error_fd());
4031 for (i = 0; i < 78; i++) err.print_raw("=");
4032 err.cr();
4033 err.print_raw_cr(title);
4034 for (i = 0; i < 78; i++) err.print_raw("-");
4035 err.cr();
4036 err.print_raw_cr(message);
4037 for (i = 0; i < 78; i++) err.print_raw("=");
4038 err.cr();
4039
4040 char buf[16];
4041 // Prevent process from exiting upon "read error" without consuming all CPU
4042 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4043
4044 return buf[0] == 'y' || buf[0] == 'Y';
4045 }
4046
4047 static int sr_notify(OSThread* osthread) {
4048 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4049 assert_status(status == 0, status, "thr_kill");
4050 return status;
4051 }
4052
4053 // "Randomly" selected value for how long we want to spin
4054 // before bailing out on suspending a thread, also how often
4055 // we send a signal to a thread we want to resume
4056 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4057 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4058
4059 static bool do_suspend(OSThread* osthread) {
4060 assert(osthread->sr.is_running(), "thread should be running");
4061 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4062
4063 // mark as suspended and send signal
4064 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4065 // failed to switch, state wasn't running?
4066 ShouldNotReachHere();
4067 return false;
4068 }
4069
4070 if (sr_notify(osthread) != 0) {
4071 ShouldNotReachHere();
4072 }
4073
4074 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4075 while (true) {
4076 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4077 break;
4078 } else {
4079 // timeout
4080 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4081 if (cancelled == os::SuspendResume::SR_RUNNING) {
4082 return false;
4083 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4084 // make sure that we consume the signal on the semaphore as well
4085 sr_semaphore.wait();
4086 break;
4087 } else {
4088 ShouldNotReachHere();
4089 return false;
4090 }
4091 }
4092 }
4093
4094 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4095 return true;
4096 }
4097
4098 static void do_resume(OSThread* osthread) {
4099 assert(osthread->sr.is_suspended(), "thread should be suspended");
4100 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4101
4102 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4103 // failed to switch to WAKEUP_REQUEST
4104 ShouldNotReachHere();
4105 return;
4106 }
4107
4108 while (true) {
4109 if (sr_notify(osthread) == 0) {
4110 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4111 if (osthread->sr.is_running()) {
4112 return;
4113 }
4114 }
4115 } else {
4116 ShouldNotReachHere();
4117 }
4118 }
4119
4120 guarantee(osthread->sr.is_running(), "Must be running!");
4121 }
4122
4123 void os::SuspendedThreadTask::internal_do_task() {
4124 if (do_suspend(_thread->osthread())) {
4125 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4126 do_task(context);
4127 do_resume(_thread->osthread());
4128 }
4129 }
4130
4131 class PcFetcher : public os::SuspendedThreadTask {
4132 public:
4133 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4134 ExtendedPC result();
4135 protected:
4136 void do_task(const os::SuspendedThreadTaskContext& context);
4137 private:
4138 ExtendedPC _epc;
4139 };
4140
4141 ExtendedPC PcFetcher::result() {
4142 guarantee(is_done(), "task is not done yet.");
4143 return _epc;
4144 }
4145
4146 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4147 Thread* thread = context.thread();
4148 OSThread* osthread = thread->osthread();
4149 if (osthread->ucontext() != NULL) {
4150 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4151 } else {
4152 // NULL context is unexpected, double-check this is the VMThread
4153 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4154 }
4155 }
4156
4157 // A lightweight implementation that does not suspend the target thread and
4158 // thus returns only a hint. Used for profiling only!
4159 ExtendedPC os::get_thread_pc(Thread* thread) {
4160 // Make sure that it is called by the watcher and the Threads lock is owned.
4161 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4162 // For now, is only used to profile the VM Thread
4163 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4164 PcFetcher fetcher(thread);
4165 fetcher.run();
4166 return fetcher.result();
4167 }
4168
4169
4170 // This does not do anything on Solaris. This is basically a hook for being
4171 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4172 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4173 f(value, method, args, thread);
4174 }
4175
4176 // This routine may be used by user applications as a "hook" to catch signals.
4177 // The user-defined signal handler must pass unrecognized signals to this
4178 // routine, and if it returns true (non-zero), then the signal handler must
4179 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4180 // routine will never retun false (zero), but instead will execute a VM panic
4181 // routine kill the process.
4182 //
4183 // If this routine returns false, it is OK to call it again. This allows
4184 // the user-defined signal handler to perform checks either before or after
4185 // the VM performs its own checks. Naturally, the user code would be making
4186 // a serious error if it tried to handle an exception (such as a null check
4187 // or breakpoint) that the VM was generating for its own correct operation.
4188 //
4189 // This routine may recognize any of the following kinds of signals:
4190 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4191 // os::Solaris::SIGasync
4192 // It should be consulted by handlers for any of those signals.
4193 // It explicitly does not recognize os::Solaris::SIGinterrupt
4194 //
4195 // The caller of this routine must pass in the three arguments supplied
4196 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4197 // field of the structure passed to sigaction(). This routine assumes that
4198 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4199 //
4200 // Note that the VM will print warnings if it detects conflicting signal
4201 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4202 //
4203 extern "C" JNIEXPORT int
4204 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4205 int abort_if_unrecognized);
4206
4207
4208 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4209 int orig_errno = errno; // Preserve errno value over signal handler.
4210 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4211 errno = orig_errno;
4212 }
4213
4214 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4215 is needed to provoke threads blocked on IO to return an EINTR
4216 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4217 does NOT participate in signal chaining due to requirement for
4218 NOT setting SA_RESTART to make EINTR work. */
4219 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4220 if (UseSignalChaining) {
4221 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4222 if (actp && actp->sa_handler) {
4223 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4224 }
4225 }
4226 }
4227
4228 // This boolean allows users to forward their own non-matching signals
4229 // to JVM_handle_solaris_signal, harmlessly.
4230 bool os::Solaris::signal_handlers_are_installed = false;
4231
4232 // For signal-chaining
4233 bool os::Solaris::libjsig_is_loaded = false;
4234 typedef struct sigaction *(*get_signal_t)(int);
4235 get_signal_t os::Solaris::get_signal_action = NULL;
4236
4237 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4238 struct sigaction *actp = NULL;
4239
4240 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4241 // Retrieve the old signal handler from libjsig
4242 actp = (*get_signal_action)(sig);
4243 }
4244 if (actp == NULL) {
4245 // Retrieve the preinstalled signal handler from jvm
4246 actp = get_preinstalled_handler(sig);
4247 }
4248
4249 return actp;
4250 }
4251
4252 static bool call_chained_handler(struct sigaction *actp, int sig,
4253 siginfo_t *siginfo, void *context) {
4254 // Call the old signal handler
4255 if (actp->sa_handler == SIG_DFL) {
4256 // It's more reasonable to let jvm treat it as an unexpected exception
4257 // instead of taking the default action.
4258 return false;
4259 } else if (actp->sa_handler != SIG_IGN) {
4260 if ((actp->sa_flags & SA_NODEFER) == 0) {
4261 // automaticlly block the signal
4262 sigaddset(&(actp->sa_mask), sig);
4263 }
4264
4265 sa_handler_t hand;
4266 sa_sigaction_t sa;
4267 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4268 // retrieve the chained handler
4269 if (siginfo_flag_set) {
4270 sa = actp->sa_sigaction;
4271 } else {
4272 hand = actp->sa_handler;
4273 }
4274
4275 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4276 actp->sa_handler = SIG_DFL;
4277 }
4278
4279 // try to honor the signal mask
4280 sigset_t oset;
4281 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4282
4283 // call into the chained handler
4284 if (siginfo_flag_set) {
4285 (*sa)(sig, siginfo, context);
4286 } else {
4287 (*hand)(sig);
4288 }
4289
4290 // restore the signal mask
4291 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4292 }
4293 // Tell jvm's signal handler the signal is taken care of.
4294 return true;
4295 }
4296
4297 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4298 bool chained = false;
4299 // signal-chaining
4300 if (UseSignalChaining) {
4301 struct sigaction *actp = get_chained_signal_action(sig);
4302 if (actp != NULL) {
4303 chained = call_chained_handler(actp, sig, siginfo, context);
4304 }
4305 }
4306 return chained;
4307 }
4308
4309 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4310 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4311 if (preinstalled_sigs[sig] != 0) {
4312 return &chainedsigactions[sig];
4313 }
4314 return NULL;
4315 }
4316
4317 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4318
4319 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4320 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4321 chainedsigactions[sig] = oldAct;
4322 preinstalled_sigs[sig] = 1;
4323 }
4324
4325 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4326 // Check for overwrite.
4327 struct sigaction oldAct;
4328 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4329 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4330 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4331 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4332 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4333 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4334 if (AllowUserSignalHandlers || !set_installed) {
4335 // Do not overwrite; user takes responsibility to forward to us.
4336 return;
4337 } else if (UseSignalChaining) {
4338 if (oktochain) {
4339 // save the old handler in jvm
4340 save_preinstalled_handler(sig, oldAct);
4341 } else {
4342 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4343 }
4344 // libjsig also interposes the sigaction() call below and saves the
4345 // old sigaction on it own.
4346 } else {
4347 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4348 "%#lx for signal %d.", (long)oldhand, sig));
4349 }
4350 }
4351
4352 struct sigaction sigAct;
4353 sigfillset(&(sigAct.sa_mask));
4354 sigAct.sa_handler = SIG_DFL;
4355
4356 sigAct.sa_sigaction = signalHandler;
4357 // Handle SIGSEGV on alternate signal stack if
4358 // not using stack banging
4359 if (!UseStackBanging && sig == SIGSEGV) {
4360 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4361 // Interruptible i/o requires SA_RESTART cleared so EINTR
4362 // is returned instead of restarting system calls
4363 } else if (sig == os::Solaris::SIGinterrupt()) {
4364 sigemptyset(&sigAct.sa_mask);
4365 sigAct.sa_handler = NULL;
4366 sigAct.sa_flags = SA_SIGINFO;
4367 sigAct.sa_sigaction = sigINTRHandler;
4368 } else {
4369 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4370 }
4371 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4372
4373 sigaction(sig, &sigAct, &oldAct);
4374
4375 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4376 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4377 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4378 }
4379
4380
4381 #define DO_SIGNAL_CHECK(sig) \
4382 if (!sigismember(&check_signal_done, sig)) \
4383 os::Solaris::check_signal_handler(sig)
4384
4385 // This method is a periodic task to check for misbehaving JNI applications
4386 // under CheckJNI, we can add any periodic checks here
4387
4388 void os::run_periodic_checks() {
4389 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4390 // thereby preventing a NULL checks.
4391 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4392
4393 if (check_signals == false) return;
4394
4395 // SEGV and BUS if overridden could potentially prevent
4396 // generation of hs*.log in the event of a crash, debugging
4397 // such a case can be very challenging, so we absolutely
4398 // check for the following for a good measure:
4399 DO_SIGNAL_CHECK(SIGSEGV);
4400 DO_SIGNAL_CHECK(SIGILL);
4401 DO_SIGNAL_CHECK(SIGFPE);
4402 DO_SIGNAL_CHECK(SIGBUS);
4403 DO_SIGNAL_CHECK(SIGPIPE);
4404 DO_SIGNAL_CHECK(SIGXFSZ);
4405
4406 // ReduceSignalUsage allows the user to override these handlers
4407 // see comments at the very top and jvm_solaris.h
4408 if (!ReduceSignalUsage) {
4409 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4410 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4411 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4412 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4413 }
4414
4415 // See comments above for using JVM1/JVM2 and UseAltSigs
4416 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4417 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4418
4419 }
4420
4421 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4422
4423 static os_sigaction_t os_sigaction = NULL;
4424
4425 void os::Solaris::check_signal_handler(int sig) {
4426 char buf[O_BUFLEN];
4427 address jvmHandler = NULL;
4428
4429 struct sigaction act;
4430 if (os_sigaction == NULL) {
4431 // only trust the default sigaction, in case it has been interposed
4432 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4433 if (os_sigaction == NULL) return;
4434 }
4435
4436 os_sigaction(sig, (struct sigaction*)NULL, &act);
4437
4438 address thisHandler = (act.sa_flags & SA_SIGINFO)
4439 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4440 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4441
4442
4443 switch(sig) {
4444 case SIGSEGV:
4445 case SIGBUS:
4446 case SIGFPE:
4447 case SIGPIPE:
4448 case SIGXFSZ:
4449 case SIGILL:
4450 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4451 break;
4452
4453 case SHUTDOWN1_SIGNAL:
4454 case SHUTDOWN2_SIGNAL:
4455 case SHUTDOWN3_SIGNAL:
4456 case BREAK_SIGNAL:
4457 jvmHandler = (address)user_handler();
4458 break;
4459
4460 default:
4461 int intrsig = os::Solaris::SIGinterrupt();
4462 int asynsig = os::Solaris::SIGasync();
4463
4464 if (sig == intrsig) {
4465 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4466 } else if (sig == asynsig) {
4467 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4468 } else {
4469 return;
4470 }
4471 break;
4472 }
4473
4474
4475 if (thisHandler != jvmHandler) {
4476 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4477 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4478 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4479 // No need to check this sig any longer
4480 sigaddset(&check_signal_done, sig);
4481 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4482 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4483 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4484 exception_name(sig, buf, O_BUFLEN));
4485 }
4486 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4487 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4488 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4489 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4490 // No need to check this sig any longer
4491 sigaddset(&check_signal_done, sig);
4492 }
4493
4494 // Print all the signal handler state
4495 if (sigismember(&check_signal_done, sig)) {
4496 print_signal_handlers(tty, buf, O_BUFLEN);
4497 }
4498
4499 }
4500
4501 void os::Solaris::install_signal_handlers() {
4502 bool libjsigdone = false;
4503 signal_handlers_are_installed = true;
4504
4505 // signal-chaining
4506 typedef void (*signal_setting_t)();
4507 signal_setting_t begin_signal_setting = NULL;
4508 signal_setting_t end_signal_setting = NULL;
4509 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4510 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4511 if (begin_signal_setting != NULL) {
4512 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4513 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4514 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4515 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4516 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4517 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4518 libjsig_is_loaded = true;
4519 if (os::Solaris::get_libjsig_version != NULL) {
4520 libjsigversion = (*os::Solaris::get_libjsig_version)();
4521 }
4522 assert(UseSignalChaining, "should enable signal-chaining");
4523 }
4524 if (libjsig_is_loaded) {
4525 // Tell libjsig jvm is setting signal handlers
4526 (*begin_signal_setting)();
4527 }
4528
4529 set_signal_handler(SIGSEGV, true, true);
4530 set_signal_handler(SIGPIPE, true, true);
4531 set_signal_handler(SIGXFSZ, true, true);
4532 set_signal_handler(SIGBUS, true, true);
4533 set_signal_handler(SIGILL, true, true);
4534 set_signal_handler(SIGFPE, true, true);
4535
4536
4537 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4538
4539 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4540 // can not register overridable signals which might be > 32
4541 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4542 // Tell libjsig jvm has finished setting signal handlers
4543 (*end_signal_setting)();
4544 libjsigdone = true;
4545 }
4546 }
4547
4548 // Never ok to chain our SIGinterrupt
4549 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4550 set_signal_handler(os::Solaris::SIGasync(), true, true);
4551
4552 if (libjsig_is_loaded && !libjsigdone) {
4553 // Tell libjsig jvm finishes setting signal handlers
4554 (*end_signal_setting)();
4555 }
4556
4557 // We don't activate signal checker if libjsig is in place, we trust ourselves
4558 // and if UserSignalHandler is installed all bets are off.
4559 // Log that signal checking is off only if -verbose:jni is specified.
4560 if (CheckJNICalls) {
4561 if (libjsig_is_loaded) {
4562 if (PrintJNIResolving) {
4563 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4564 }
4565 check_signals = false;
4566 }
4567 if (AllowUserSignalHandlers) {
4568 if (PrintJNIResolving) {
4569 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4570 }
4571 check_signals = false;
4572 }
4573 }
4574 }
4575
4576
4577 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4578
4579 const char * signames[] = {
4580 "SIG0",
4581 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4582 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4583 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4584 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4585 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4586 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4587 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4588 "SIGCANCEL", "SIGLOST"
4589 };
4590
4591 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4592 if (0 < exception_code && exception_code <= SIGRTMAX) {
4593 // signal
4594 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4595 jio_snprintf(buf, size, "%s", signames[exception_code]);
4596 } else {
4597 jio_snprintf(buf, size, "SIG%d", exception_code);
4598 }
4599 return buf;
4600 } else {
4601 return NULL;
4602 }
4603 }
4604
4605 // (Static) wrappers for the new libthread API
4606 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4607 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4608 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4609 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4610 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4611
4612 // (Static) wrapper for getisax(2) call.
4613 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4614
4615 // (Static) wrappers for the liblgrp API
4616 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4617 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4618 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4619 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4620 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4621 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4622 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4623 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4624 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4625
4626 // (Static) wrapper for meminfo() call.
4627 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4628
4629 static address resolve_symbol_lazy(const char* name) {
4630 address addr = (address) dlsym(RTLD_DEFAULT, name);
4631 if(addr == NULL) {
4632 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4633 addr = (address) dlsym(RTLD_NEXT, name);
4634 }
4635 return addr;
4636 }
4637
4638 static address resolve_symbol(const char* name) {
4639 address addr = resolve_symbol_lazy(name);
4640 if(addr == NULL) {
4641 fatal(dlerror());
4642 }
4643 return addr;
4644 }
4645
4646
4647
4648 // isT2_libthread()
4649 //
4650 // Routine to determine if we are currently using the new T2 libthread.
4651 //
4652 // We determine if we are using T2 by reading /proc/self/lstatus and
4653 // looking for a thread with the ASLWP bit set. If we find this status
4654 // bit set, we must assume that we are NOT using T2. The T2 team
4655 // has approved this algorithm.
4656 //
4657 // We need to determine if we are running with the new T2 libthread
4658 // since setting native thread priorities is handled differently
4659 // when using this library. All threads created using T2 are bound
4660 // threads. Calling thr_setprio is meaningless in this case.
4661 //
4662 bool isT2_libthread() {
4663 static prheader_t * lwpArray = NULL;
4664 static int lwpSize = 0;
4665 static int lwpFile = -1;
4666 lwpstatus_t * that;
4667 char lwpName [128];
4668 bool isT2 = false;
4669
4670 #define ADR(x) ((uintptr_t)(x))
4671 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4672
4673 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4674 if (lwpFile < 0) {
4675 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4676 return false;
4677 }
4678 lwpSize = 16*1024;
4679 for (;;) {
4680 ::lseek64 (lwpFile, 0, SEEK_SET);
4681 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4682 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4683 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4684 break;
4685 }
4686 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4687 // We got a good snapshot - now iterate over the list.
4688 int aslwpcount = 0;
4689 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4690 that = LWPINDEX(lwpArray,i);
4691 if (that->pr_flags & PR_ASLWP) {
4692 aslwpcount++;
4693 }
4694 }
4695 if (aslwpcount == 0) isT2 = true;
4696 break;
4697 }
4698 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4699 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4700 }
4701
4702 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4703 ::close (lwpFile);
4704 if (ThreadPriorityVerbose) {
4705 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4706 else tty->print_cr("We are not running with a T2 libthread\n");
4707 }
4708 return isT2;
4709 }
4710
4711
4712 void os::Solaris::libthread_init() {
4713 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4714
4715 // Determine if we are running with the new T2 libthread
4716 os::Solaris::set_T2_libthread(isT2_libthread());
4717
4718 lwp_priocntl_init();
4719
4720 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4721 if(func == NULL) {
4722 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4723 // Guarantee that this VM is running on an new enough OS (5.6 or
4724 // later) that it will have a new enough libthread.so.
4725 guarantee(func != NULL, "libthread.so is too old.");
4726 }
4727
4728 // Initialize the new libthread getstate API wrappers
4729 func = resolve_symbol("thr_getstate");
4730 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4731
4732 func = resolve_symbol("thr_setstate");
4733 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4734
4735 func = resolve_symbol("thr_setmutator");
4736 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4737
4738 func = resolve_symbol("thr_suspend_mutator");
4739 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4740
4741 func = resolve_symbol("thr_continue_mutator");
4742 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4743
4744 int size;
4745 void (*handler_info_func)(address *, int *);
4746 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4747 handler_info_func(&handler_start, &size);
4748 handler_end = handler_start + size;
4749 }
4750
4751
4752 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4753 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4754 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4755 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4756 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4757 int os::Solaris::_mutex_scope = USYNC_THREAD;
4758
4759 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4760 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4761 int_fnP_cond_tP os::Solaris::_cond_signal;
4762 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4763 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4764 int_fnP_cond_tP os::Solaris::_cond_destroy;
4765 int os::Solaris::_cond_scope = USYNC_THREAD;
4766
4767 void os::Solaris::synchronization_init() {
4768 if(UseLWPSynchronization) {
4769 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4770 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4771 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4772 os::Solaris::set_mutex_init(lwp_mutex_init);
4773 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4774 os::Solaris::set_mutex_scope(USYNC_THREAD);
4775
4776 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4777 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4778 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4779 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4780 os::Solaris::set_cond_init(lwp_cond_init);
4781 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4782 os::Solaris::set_cond_scope(USYNC_THREAD);
4783 }
4784 else {
4785 os::Solaris::set_mutex_scope(USYNC_THREAD);
4786 os::Solaris::set_cond_scope(USYNC_THREAD);
4787
4788 if(UsePthreads) {
4789 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4790 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4791 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4792 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4793 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4794
4795 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4796 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4797 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4798 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4799 os::Solaris::set_cond_init(pthread_cond_default_init);
4800 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4801 }
4802 else {
4803 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4804 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4805 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4806 os::Solaris::set_mutex_init(::mutex_init);
4807 os::Solaris::set_mutex_destroy(::mutex_destroy);
4808
4809 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4810 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4811 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4812 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4813 os::Solaris::set_cond_init(::cond_init);
4814 os::Solaris::set_cond_destroy(::cond_destroy);
4815 }
4816 }
4817 }
4818
4819 bool os::Solaris::liblgrp_init() {
4820 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4821 if (handle != NULL) {
4822 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4823 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4824 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4825 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4826 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4827 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4828 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4829 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4830 dlsym(handle, "lgrp_cookie_stale")));
4831
4832 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4833 set_lgrp_cookie(c);
4834 return true;
4835 }
4836 return false;
4837 }
4838
4839 void os::Solaris::misc_sym_init() {
4840 address func;
4841
4842 // getisax
4843 func = resolve_symbol_lazy("getisax");
4844 if (func != NULL) {
4845 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4846 }
4847
4848 // meminfo
4849 func = resolve_symbol_lazy("meminfo");
4850 if (func != NULL) {
4851 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4852 }
4853 }
4854
4855 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4856 assert(_getisax != NULL, "_getisax not set");
4857 return _getisax(array, n);
4858 }
4859
4860 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4861 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4862 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4863
4864 void init_pset_getloadavg_ptr(void) {
4865 pset_getloadavg_ptr =
4866 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4867 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4868 warning("pset_getloadavg function not found");
4869 }
4870 }
4871
4872 int os::Solaris::_dev_zero_fd = -1;
4873
4874 // this is called _before_ the global arguments have been parsed
4875 void os::init(void) {
4876 _initial_pid = getpid();
4877
4878 max_hrtime = first_hrtime = gethrtime();
4879
4880 init_random(1234567);
4881
4882 page_size = sysconf(_SC_PAGESIZE);
4883 if (page_size == -1)
4884 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4885 strerror(errno)));
4886 init_page_sizes((size_t) page_size);
4887
4888 Solaris::initialize_system_info();
4889
4890 // Initialize misc. symbols as soon as possible, so we can use them
4891 // if we need them.
4892 Solaris::misc_sym_init();
4893
4894 int fd = ::open("/dev/zero", O_RDWR);
4895 if (fd < 0) {
4896 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4897 } else {
4898 Solaris::set_dev_zero_fd(fd);
4899
4900 // Close on exec, child won't inherit.
4901 fcntl(fd, F_SETFD, FD_CLOEXEC);
4902 }
4903
4904 clock_tics_per_sec = CLK_TCK;
4905
4906 // check if dladdr1() exists; dladdr1 can provide more information than
4907 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4908 // and is available on linker patches for 5.7 and 5.8.
4909 // libdl.so must have been loaded, this call is just an entry lookup
4910 void * hdl = dlopen("libdl.so", RTLD_NOW);
4911 if (hdl)
4912 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4913
4914 // (Solaris only) this switches to calls that actually do locking.
4915 ThreadCritical::initialize();
4916
4917 // main_thread points to the thread that created/loaded the JVM.
4918 main_thread = thr_self();
4919
4920 // Constant minimum stack size allowed. It must be at least
4921 // the minimum of what the OS supports (thr_min_stack()), and
4922 // enough to allow the thread to get to user bytecode execution.
4923 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4924 // If the pagesize of the VM is greater than 8K determine the appropriate
4925 // number of initial guard pages. The user can change this with the
4926 // command line arguments, if needed.
4927 if (vm_page_size() > 8*K) {
4928 StackYellowPages = 1;
4929 StackRedPages = 1;
4930 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4931 }
4932 }
4933
4934 // To install functions for atexit system call
4935 extern "C" {
4936 static void perfMemory_exit_helper() {
4937 perfMemory_exit();
4938 }
4939 }
4940
4941 // this is called _after_ the global arguments have been parsed
4942 jint os::init_2(void) {
4943 // try to enable extended file IO ASAP, see 6431278
4944 os::Solaris::try_enable_extended_io();
4945
4946 // Allocate a single page and mark it as readable for safepoint polling. Also
4947 // use this first mmap call to check support for MAP_ALIGN.
4948 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4949 page_size,
4950 MAP_PRIVATE | MAP_ALIGN,
4951 PROT_READ);
4952 if (polling_page == NULL) {
4953 has_map_align = false;
4954 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4955 PROT_READ);
4956 }
4957
4958 os::set_polling_page(polling_page);
4959
4960 #ifndef PRODUCT
4961 if( Verbose && PrintMiscellaneous )
4962 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4963 #endif
4964
4965 if (!UseMembar) {
4966 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4967 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4968 os::set_memory_serialize_page( mem_serialize_page );
4969
4970 #ifndef PRODUCT
4971 if(Verbose && PrintMiscellaneous)
4972 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4973 #endif
4974 }
4975
4976 // Check minimum allowable stack size for thread creation and to initialize
4977 // the java system classes, including StackOverflowError - depends on page
4978 // size. Add a page for compiler2 recursion in main thread.
4979 // Add in 2*BytesPerWord times page size to account for VM stack during
4980 // class initialization depending on 32 or 64 bit VM.
4981 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4982 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4983 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4984
4985 size_t threadStackSizeInBytes = ThreadStackSize * K;
4986 if (threadStackSizeInBytes != 0 &&
4987 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4988 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4989 os::Solaris::min_stack_allowed/K);
4990 return JNI_ERR;
4991 }
4992
4993 // For 64kbps there will be a 64kb page size, which makes
4994 // the usable default stack size quite a bit less. Increase the
4995 // stack for 64kb (or any > than 8kb) pages, this increases
4996 // virtual memory fragmentation (since we're not creating the
4997 // stack on a power of 2 boundary. The real fix for this
4998 // should be to fix the guard page mechanism.
4999
5000 if (vm_page_size() > 8*K) {
5001 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5002 ? threadStackSizeInBytes +
5003 ((StackYellowPages + StackRedPages) * vm_page_size())
5004 : 0;
5005 ThreadStackSize = threadStackSizeInBytes/K;
5006 }
5007
5008 // Make the stack size a multiple of the page size so that
5009 // the yellow/red zones can be guarded.
5010 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5011 vm_page_size()));
5012
5013 Solaris::libthread_init();
5014
5015 if (UseNUMA) {
5016 if (!Solaris::liblgrp_init()) {
5017 UseNUMA = false;
5018 } else {
5019 size_t lgrp_limit = os::numa_get_groups_num();
5020 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5021 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5022 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5023 if (lgrp_num < 2) {
5024 // There's only one locality group, disable NUMA.
5025 UseNUMA = false;
5026 }
5027 }
5028 if (!UseNUMA && ForceNUMA) {
5029 UseNUMA = true;
5030 }
5031 }
5032
5033 Solaris::signal_sets_init();
5034 Solaris::init_signal_mem();
5035 Solaris::install_signal_handlers();
5036
5037 if (libjsigversion < JSIG_VERSION_1_4_1) {
5038 Maxlibjsigsigs = OLDMAXSIGNUM;
5039 }
5040
5041 // initialize synchronization primitives to use either thread or
5042 // lwp synchronization (controlled by UseLWPSynchronization)
5043 Solaris::synchronization_init();
5044
5045 if (MaxFDLimit) {
5046 // set the number of file descriptors to max. print out error
5047 // if getrlimit/setrlimit fails but continue regardless.
5048 struct rlimit nbr_files;
5049 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5050 if (status != 0) {
5051 if (PrintMiscellaneous && (Verbose || WizardMode))
5052 perror("os::init_2 getrlimit failed");
5053 } else {
5054 nbr_files.rlim_cur = nbr_files.rlim_max;
5055 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5056 if (status != 0) {
5057 if (PrintMiscellaneous && (Verbose || WizardMode))
5058 perror("os::init_2 setrlimit failed");
5059 }
5060 }
5061 }
5062
5063 // Calculate theoretical max. size of Threads to guard gainst
5064 // artifical out-of-memory situations, where all available address-
5065 // space has been reserved by thread stacks. Default stack size is 1Mb.
5066 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5067 JavaThread::stack_size_at_create() : (1*K*K);
5068 assert(pre_thread_stack_size != 0, "Must have a stack");
5069 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5070 // we should start doing Virtual Memory banging. Currently when the threads will
5071 // have used all but 200Mb of space.
5072 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5073 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5074
5075 // at-exit methods are called in the reverse order of their registration.
5076 // In Solaris 7 and earlier, atexit functions are called on return from
5077 // main or as a result of a call to exit(3C). There can be only 32 of
5078 // these functions registered and atexit() does not set errno. In Solaris
5079 // 8 and later, there is no limit to the number of functions registered
5080 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5081 // functions are called upon dlclose(3DL) in addition to return from main
5082 // and exit(3C).
5083
5084 if (PerfAllowAtExitRegistration) {
5085 // only register atexit functions if PerfAllowAtExitRegistration is set.
5086 // atexit functions can be delayed until process exit time, which
5087 // can be problematic for embedded VM situations. Embedded VMs should
5088 // call DestroyJavaVM() to assure that VM resources are released.
5089
5090 // note: perfMemory_exit_helper atexit function may be removed in
5091 // the future if the appropriate cleanup code can be added to the
5092 // VM_Exit VMOperation's doit method.
5093 if (atexit(perfMemory_exit_helper) != 0) {
5094 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5095 }
5096 }
5097
5098 // Init pset_loadavg function pointer
5099 init_pset_getloadavg_ptr();
5100
5101 return JNI_OK;
5102 }
5103
5104 // Mark the polling page as unreadable
5105 void os::make_polling_page_unreadable(void) {
5106 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5107 fatal("Could not disable polling page");
5108 };
5109
5110 // Mark the polling page as readable
5111 void os::make_polling_page_readable(void) {
5112 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5113 fatal("Could not enable polling page");
5114 };
5115
5116 // OS interface.
5117
5118 bool os::check_heap(bool force) { return true; }
5119
5120 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5121 static vsnprintf_t sol_vsnprintf = NULL;
5122
5123 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5124 if (!sol_vsnprintf) {
5125 //search for the named symbol in the objects that were loaded after libjvm
5126 void* where = RTLD_NEXT;
5127 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5128 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5129 if (!sol_vsnprintf){
5130 //search for the named symbol in the objects that were loaded before libjvm
5131 where = RTLD_DEFAULT;
5132 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5133 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5134 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5135 }
5136 }
5137 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5138 }
5139
5140
5141 // Is a (classpath) directory empty?
5142 bool os::dir_is_empty(const char* path) {
5143 DIR *dir = NULL;
5144 struct dirent *ptr;
5145
5146 dir = opendir(path);
5147 if (dir == NULL) return true;
5148
5149 /* Scan the directory */
5150 bool result = true;
5151 char buf[sizeof(struct dirent) + MAX_PATH];
5152 struct dirent *dbuf = (struct dirent *) buf;
5153 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5154 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5155 result = false;
5156 }
5157 }
5158 closedir(dir);
5159 return result;
5160 }
5161
5162 // This code originates from JDK's sysOpen and open64_w
5163 // from src/solaris/hpi/src/system_md.c
5164
5165 #ifndef O_DELETE
5166 #define O_DELETE 0x10000
5167 #endif
5168
5169 // Open a file. Unlink the file immediately after open returns
5170 // if the specified oflag has the O_DELETE flag set.
5171 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5172
5173 int os::open(const char *path, int oflag, int mode) {
5174 if (strlen(path) > MAX_PATH - 1) {
5175 errno = ENAMETOOLONG;
5176 return -1;
5177 }
5178 int fd;
5179 int o_delete = (oflag & O_DELETE);
5180 oflag = oflag & ~O_DELETE;
5181
5182 fd = ::open64(path, oflag, mode);
5183 if (fd == -1) return -1;
5184
5185 //If the open succeeded, the file might still be a directory
5186 {
5187 struct stat64 buf64;
5188 int ret = ::fstat64(fd, &buf64);
5189 int st_mode = buf64.st_mode;
5190
5191 if (ret != -1) {
5192 if ((st_mode & S_IFMT) == S_IFDIR) {
5193 errno = EISDIR;
5194 ::close(fd);
5195 return -1;
5196 }
5197 } else {
5198 ::close(fd);
5199 return -1;
5200 }
5201 }
5202 /*
5203 * 32-bit Solaris systems suffer from:
5204 *
5205 * - an historical default soft limit of 256 per-process file
5206 * descriptors that is too low for many Java programs.
5207 *
5208 * - a design flaw where file descriptors created using stdio
5209 * fopen must be less than 256, _even_ when the first limit above
5210 * has been raised. This can cause calls to fopen (but not calls to
5211 * open, for example) to fail mysteriously, perhaps in 3rd party
5212 * native code (although the JDK itself uses fopen). One can hardly
5213 * criticize them for using this most standard of all functions.
5214 *
5215 * We attempt to make everything work anyways by:
5216 *
5217 * - raising the soft limit on per-process file descriptors beyond
5218 * 256
5219 *
5220 * - As of Solaris 10u4, we can request that Solaris raise the 256
5221 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5222 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5223 *
5224 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5225 * workaround the bug by remapping non-stdio file descriptors below
5226 * 256 to ones beyond 256, which is done below.
5227 *
5228 * See:
5229 * 1085341: 32-bit stdio routines should support file descriptors >255
5230 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5231 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5232 * enable_extended_FILE_stdio() in VM initialisation
5233 * Giri Mandalika's blog
5234 * http://technopark02.blogspot.com/2005_05_01_archive.html
5235 */
5236 #ifndef _LP64
5237 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5238 int newfd = ::fcntl(fd, F_DUPFD, 256);
5239 if (newfd != -1) {
5240 ::close(fd);
5241 fd = newfd;
5242 }
5243 }
5244 #endif // 32-bit Solaris
5245 /*
5246 * All file descriptors that are opened in the JVM and not
5247 * specifically destined for a subprocess should have the
5248 * close-on-exec flag set. If we don't set it, then careless 3rd
5249 * party native code might fork and exec without closing all
5250 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5251 * UNIXProcess.c), and this in turn might:
5252 *
5253 * - cause end-of-file to fail to be detected on some file
5254 * descriptors, resulting in mysterious hangs, or
5255 *
5256 * - might cause an fopen in the subprocess to fail on a system
5257 * suffering from bug 1085341.
5258 *
5259 * (Yes, the default setting of the close-on-exec flag is a Unix
5260 * design flaw)
5261 *
5262 * See:
5263 * 1085341: 32-bit stdio routines should support file descriptors >255
5264 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5265 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5266 */
5267 #ifdef FD_CLOEXEC
5268 {
5269 int flags = ::fcntl(fd, F_GETFD);
5270 if (flags != -1)
5271 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5272 }
5273 #endif
5274
5275 if (o_delete != 0) {
5276 ::unlink(path);
5277 }
5278 return fd;
5279 }
5280
5281 // create binary file, rewriting existing file if required
5282 int os::create_binary_file(const char* path, bool rewrite_existing) {
5283 int oflags = O_WRONLY | O_CREAT;
5284 if (!rewrite_existing) {
5285 oflags |= O_EXCL;
5286 }
5287 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5288 }
5289
5290 // return current position of file pointer
5291 jlong os::current_file_offset(int fd) {
5292 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5293 }
5294
5295 // move file pointer to the specified offset
5296 jlong os::seek_to_file_offset(int fd, jlong offset) {
5297 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5298 }
5299
5300 jlong os::lseek(int fd, jlong offset, int whence) {
5301 return (jlong) ::lseek64(fd, offset, whence);
5302 }
5303
5304 char * os::native_path(char *path) {
5305 return path;
5306 }
5307
5308 int os::ftruncate(int fd, jlong length) {
5309 return ::ftruncate64(fd, length);
5310 }
5311
5312 int os::fsync(int fd) {
5313 RESTARTABLE_RETURN_INT(::fsync(fd));
5314 }
5315
5316 int os::available(int fd, jlong *bytes) {
5317 jlong cur, end;
5318 int mode;
5319 struct stat64 buf64;
5320
5321 if (::fstat64(fd, &buf64) >= 0) {
5322 mode = buf64.st_mode;
5323 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5324 /*
5325 * XXX: is the following call interruptible? If so, this might
5326 * need to go through the INTERRUPT_IO() wrapper as for other
5327 * blocking, interruptible calls in this file.
5328 */
5329 int n,ioctl_return;
5330
5331 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5332 if (ioctl_return>= 0) {
5333 *bytes = n;
5334 return 1;
5335 }
5336 }
5337 }
5338 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5339 return 0;
5340 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5341 return 0;
5342 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5343 return 0;
5344 }
5345 *bytes = end - cur;
5346 return 1;
5347 }
5348
5349 // Map a block of memory.
5350 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5351 char *addr, size_t bytes, bool read_only,
5352 bool allow_exec) {
5353 int prot;
5354 int flags;
5355
5356 if (read_only) {
5357 prot = PROT_READ;
5358 flags = MAP_SHARED;
5359 } else {
5360 prot = PROT_READ | PROT_WRITE;
5361 flags = MAP_PRIVATE;
5362 }
5363
5364 if (allow_exec) {
5365 prot |= PROT_EXEC;
5366 }
5367
5368 if (addr != NULL) {
5369 flags |= MAP_FIXED;
5370 }
5371
5372 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5373 fd, file_offset);
5374 if (mapped_address == MAP_FAILED) {
5375 return NULL;
5376 }
5377 return mapped_address;
5378 }
5379
5380
5381 // Remap a block of memory.
5382 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5383 char *addr, size_t bytes, bool read_only,
5384 bool allow_exec) {
5385 // same as map_memory() on this OS
5386 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5387 allow_exec);
5388 }
5389
5390
5391 // Unmap a block of memory.
5392 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5393 return munmap(addr, bytes) == 0;
5394 }
5395
5396 void os::pause() {
5397 char filename[MAX_PATH];
5398 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5399 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5400 } else {
5401 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5402 }
5403
5404 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5405 if (fd != -1) {
5406 struct stat buf;
5407 ::close(fd);
5408 while (::stat(filename, &buf) == 0) {
5409 (void)::poll(NULL, 0, 100);
5410 }
5411 } else {
5412 jio_fprintf(stderr,
5413 "Could not open pause file '%s', continuing immediately.\n", filename);
5414 }
5415 }
5416
5417 #ifndef PRODUCT
5418 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5419 // Turn this on if you need to trace synch operations.
5420 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5421 // and call record_synch_enable and record_synch_disable
5422 // around the computation of interest.
5423
5424 void record_synch(char* name, bool returning); // defined below
5425
5426 class RecordSynch {
5427 char* _name;
5428 public:
5429 RecordSynch(char* name) :_name(name)
5430 { record_synch(_name, false); }
5431 ~RecordSynch() { record_synch(_name, true); }
5432 };
5433
5434 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5435 extern "C" ret name params { \
5436 typedef ret name##_t params; \
5437 static name##_t* implem = NULL; \
5438 static int callcount = 0; \
5439 if (implem == NULL) { \
5440 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5441 if (implem == NULL) fatal(dlerror()); \
5442 } \
5443 ++callcount; \
5444 RecordSynch _rs(#name); \
5445 inner; \
5446 return implem args; \
5447 }
5448 // in dbx, examine callcounts this way:
5449 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5450
5451 #define CHECK_POINTER_OK(p) \
5452 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5453 #define CHECK_MU \
5454 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5455 #define CHECK_CV \
5456 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5457 #define CHECK_P(p) \
5458 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5459
5460 #define CHECK_MUTEX(mutex_op) \
5461 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5462
5463 CHECK_MUTEX( mutex_lock)
5464 CHECK_MUTEX( _mutex_lock)
5465 CHECK_MUTEX( mutex_unlock)
5466 CHECK_MUTEX(_mutex_unlock)
5467 CHECK_MUTEX( mutex_trylock)
5468 CHECK_MUTEX(_mutex_trylock)
5469
5470 #define CHECK_COND(cond_op) \
5471 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5472
5473 CHECK_COND( cond_wait);
5474 CHECK_COND(_cond_wait);
5475 CHECK_COND(_cond_wait_cancel);
5476
5477 #define CHECK_COND2(cond_op) \
5478 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5479
5480 CHECK_COND2( cond_timedwait);
5481 CHECK_COND2(_cond_timedwait);
5482 CHECK_COND2(_cond_timedwait_cancel);
5483
5484 // do the _lwp_* versions too
5485 #define mutex_t lwp_mutex_t
5486 #define cond_t lwp_cond_t
5487 CHECK_MUTEX( _lwp_mutex_lock)
5488 CHECK_MUTEX( _lwp_mutex_unlock)
5489 CHECK_MUTEX( _lwp_mutex_trylock)
5490 CHECK_MUTEX( __lwp_mutex_lock)
5491 CHECK_MUTEX( __lwp_mutex_unlock)
5492 CHECK_MUTEX( __lwp_mutex_trylock)
5493 CHECK_MUTEX(___lwp_mutex_lock)
5494 CHECK_MUTEX(___lwp_mutex_unlock)
5495
5496 CHECK_COND( _lwp_cond_wait);
5497 CHECK_COND( __lwp_cond_wait);
5498 CHECK_COND(___lwp_cond_wait);
5499
5500 CHECK_COND2( _lwp_cond_timedwait);
5501 CHECK_COND2( __lwp_cond_timedwait);
5502 #undef mutex_t
5503 #undef cond_t
5504
5505 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5506 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5507 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5508 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5509 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5510 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5511 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5512 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5513
5514
5515 // recording machinery:
5516
5517 enum { RECORD_SYNCH_LIMIT = 200 };
5518 char* record_synch_name[RECORD_SYNCH_LIMIT];
5519 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5520 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5521 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5522 int record_synch_count = 0;
5523 bool record_synch_enabled = false;
5524
5525 // in dbx, examine recorded data this way:
5526 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5527
5528 void record_synch(char* name, bool returning) {
5529 if (record_synch_enabled) {
5530 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5531 record_synch_name[record_synch_count] = name;
5532 record_synch_returning[record_synch_count] = returning;
5533 record_synch_thread[record_synch_count] = thr_self();
5534 record_synch_arg0ptr[record_synch_count] = &name;
5535 record_synch_count++;
5536 }
5537 // put more checking code here:
5538 // ...
5539 }
5540 }
5541
5542 void record_synch_enable() {
5543 // start collecting trace data, if not already doing so
5544 if (!record_synch_enabled) record_synch_count = 0;
5545 record_synch_enabled = true;
5546 }
5547
5548 void record_synch_disable() {
5549 // stop collecting trace data
5550 record_synch_enabled = false;
5551 }
5552
5553 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5554 #endif // PRODUCT
5555
5556 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5557 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5558 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5559
5560
5561 // JVMTI & JVM monitoring and management support
5562 // The thread_cpu_time() and current_thread_cpu_time() are only
5563 // supported if is_thread_cpu_time_supported() returns true.
5564 // They are not supported on Solaris T1.
5565
5566 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5567 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5568 // of a thread.
5569 //
5570 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5571 // returns the fast estimate available on the platform.
5572
5573 // hrtime_t gethrvtime() return value includes
5574 // user time but does not include system time
5575 jlong os::current_thread_cpu_time() {
5576 return (jlong) gethrvtime();
5577 }
5578
5579 jlong os::thread_cpu_time(Thread *thread) {
5580 // return user level CPU time only to be consistent with
5581 // what current_thread_cpu_time returns.
5582 // thread_cpu_time_info() must be changed if this changes
5583 return os::thread_cpu_time(thread, false /* user time only */);
5584 }
5585
5586 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5587 if (user_sys_cpu_time) {
5588 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5589 } else {
5590 return os::current_thread_cpu_time();
5591 }
5592 }
5593
5594 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5595 char proc_name[64];
5596 int count;
5597 prusage_t prusage;
5598 jlong lwp_time;
5599 int fd;
5600
5601 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5602 getpid(),
5603 thread->osthread()->lwp_id());
5604 fd = ::open(proc_name, O_RDONLY);
5605 if ( fd == -1 ) return -1;
5606
5607 do {
5608 count = ::pread(fd,
5609 (void *)&prusage.pr_utime,
5610 thr_time_size,
5611 thr_time_off);
5612 } while (count < 0 && errno == EINTR);
5613 ::close(fd);
5614 if ( count < 0 ) return -1;
5615
5616 if (user_sys_cpu_time) {
5617 // user + system CPU time
5618 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5619 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5620 (jlong)prusage.pr_stime.tv_nsec +
5621 (jlong)prusage.pr_utime.tv_nsec;
5622 } else {
5623 // user level CPU time only
5624 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5625 (jlong)prusage.pr_utime.tv_nsec;
5626 }
5627
5628 return(lwp_time);
5629 }
5630
5631 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5632 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5633 info_ptr->may_skip_backward = false; // elapsed time not wall time
5634 info_ptr->may_skip_forward = false; // elapsed time not wall time
5635 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5636 }
5637
5638 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5639 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5640 info_ptr->may_skip_backward = false; // elapsed time not wall time
5641 info_ptr->may_skip_forward = false; // elapsed time not wall time
5642 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5643 }
5644
5645 bool os::is_thread_cpu_time_supported() {
5646 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5647 return true;
5648 } else {
5649 return false;
5650 }
5651 }
5652
5653 // System loadavg support. Returns -1 if load average cannot be obtained.
5654 // Return the load average for our processor set if the primitive exists
5655 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5656 int os::loadavg(double loadavg[], int nelem) {
5657 if (pset_getloadavg_ptr != NULL) {
5658 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5659 } else {
5660 return ::getloadavg(loadavg, nelem);
5661 }
5662 }
5663
5664 //---------------------------------------------------------------------------------
5665
5666 bool os::find(address addr, outputStream* st) {
5667 Dl_info dlinfo;
5668 memset(&dlinfo, 0, sizeof(dlinfo));
5669 if (dladdr(addr, &dlinfo) != 0) {
5670 st->print(PTR_FORMAT ": ", addr);
5671 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5672 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5673 } else if (dlinfo.dli_fbase != NULL)
5674 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5675 else
5676 st->print("<absolute address>");
5677 if (dlinfo.dli_fname != NULL) {
5678 st->print(" in %s", dlinfo.dli_fname);
5679 }
5680 if (dlinfo.dli_fbase != NULL) {
5681 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5682 }
5683 st->cr();
5684
5685 if (Verbose) {
5686 // decode some bytes around the PC
5687 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5688 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5689 address lowest = (address) dlinfo.dli_sname;
5690 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5691 if (begin < lowest) begin = lowest;
5692 Dl_info dlinfo2;
5693 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5694 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5695 end = (address) dlinfo2.dli_saddr;
5696 Disassembler::decode(begin, end, st);
5697 }
5698 return true;
5699 }
5700 return false;
5701 }
5702
5703 // Following function has been added to support HotSparc's libjvm.so running
5704 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5705 // src/solaris/hpi/native_threads in the EVM codebase.
5706 //
5707 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5708 // libraries and should thus be removed. We will leave it behind for a while
5709 // until we no longer want to able to run on top of 1.3.0 Solaris production
5710 // JDK. See 4341971.
5711
5712 #define STACK_SLACK 0x800
5713
5714 extern "C" {
5715 intptr_t sysThreadAvailableStackWithSlack() {
5716 stack_t st;
5717 intptr_t retval, stack_top;
5718 retval = thr_stksegment(&st);
5719 assert(retval == 0, "incorrect return value from thr_stksegment");
5720 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5721 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5722 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5723 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5724 }
5725 }
5726
5727 // ObjectMonitor park-unpark infrastructure ...
5728 //
5729 // We implement Solaris and Linux PlatformEvents with the
5730 // obvious condvar-mutex-flag triple.
5731 // Another alternative that works quite well is pipes:
5732 // Each PlatformEvent consists of a pipe-pair.
5733 // The thread associated with the PlatformEvent
5734 // calls park(), which reads from the input end of the pipe.
5735 // Unpark() writes into the other end of the pipe.
5736 // The write-side of the pipe must be set NDELAY.
5737 // Unfortunately pipes consume a large # of handles.
5738 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5739 // Using pipes for the 1st few threads might be workable, however.
5740 //
5741 // park() is permitted to return spuriously.
5742 // Callers of park() should wrap the call to park() in
5743 // an appropriate loop. A litmus test for the correct
5744 // usage of park is the following: if park() were modified
5745 // to immediately return 0 your code should still work,
5746 // albeit degenerating to a spin loop.
5747 //
5748 // An interesting optimization for park() is to use a trylock()
5749 // to attempt to acquire the mutex. If the trylock() fails
5750 // then we know that a concurrent unpark() operation is in-progress.
5751 // in that case the park() code could simply set _count to 0
5752 // and return immediately. The subsequent park() operation *might*
5753 // return immediately. That's harmless as the caller of park() is
5754 // expected to loop. By using trylock() we will have avoided a
5755 // avoided a context switch caused by contention on the per-thread mutex.
5756 //
5757 // TODO-FIXME:
5758 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5759 // objectmonitor implementation.
5760 // 2. Collapse the JSR166 parker event, and the
5761 // objectmonitor ParkEvent into a single "Event" construct.
5762 // 3. In park() and unpark() add:
5763 // assert (Thread::current() == AssociatedWith).
5764 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5765 // 1-out-of-N park() operations will return immediately.
5766 //
5767 // _Event transitions in park()
5768 // -1 => -1 : illegal
5769 // 1 => 0 : pass - return immediately
5770 // 0 => -1 : block
5771 //
5772 // _Event serves as a restricted-range semaphore.
5773 //
5774 // Another possible encoding of _Event would be with
5775 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5776 //
5777 // TODO-FIXME: add DTRACE probes for:
5778 // 1. Tx parks
5779 // 2. Ty unparks Tx
5780 // 3. Tx resumes from park
5781
5782
5783 // value determined through experimentation
5784 #define ROUNDINGFIX 11
5785
5786 // utility to compute the abstime argument to timedwait.
5787 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5788
5789 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5790 // millis is the relative timeout time
5791 // abstime will be the absolute timeout time
5792 if (millis < 0) millis = 0;
5793 struct timeval now;
5794 int status = gettimeofday(&now, NULL);
5795 assert(status == 0, "gettimeofday");
5796 jlong seconds = millis / 1000;
5797 jlong max_wait_period;
5798
5799 if (UseLWPSynchronization) {
5800 // forward port of fix for 4275818 (not sleeping long enough)
5801 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5802 // _lwp_cond_timedwait() used a round_down algorithm rather
5803 // than a round_up. For millis less than our roundfactor
5804 // it rounded down to 0 which doesn't meet the spec.
5805 // For millis > roundfactor we may return a bit sooner, but
5806 // since we can not accurately identify the patch level and
5807 // this has already been fixed in Solaris 9 and 8 we will
5808 // leave it alone rather than always rounding down.
5809
5810 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5811 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5812 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5813 max_wait_period = 21000000;
5814 } else {
5815 max_wait_period = 50000000;
5816 }
5817 millis %= 1000;
5818 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5819 seconds = max_wait_period;
5820 }
5821 abstime->tv_sec = now.tv_sec + seconds;
5822 long usec = now.tv_usec + millis * 1000;
5823 if (usec >= 1000000) {
5824 abstime->tv_sec += 1;
5825 usec -= 1000000;
5826 }
5827 abstime->tv_nsec = usec * 1000;
5828 return abstime;
5829 }
5830
5831 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5832 // Conceptually TryPark() should be equivalent to park(0).
5833
5834 int os::PlatformEvent::TryPark() {
5835 for (;;) {
5836 const int v = _Event ;
5837 guarantee ((v == 0) || (v == 1), "invariant") ;
5838 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5839 }
5840 }
5841
5842 void os::PlatformEvent::park() { // AKA: down()
5843 // Invariant: Only the thread associated with the Event/PlatformEvent
5844 // may call park().
5845 int v ;
5846 for (;;) {
5847 v = _Event ;
5848 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5849 }
5850 guarantee (v >= 0, "invariant") ;
5851 if (v == 0) {
5852 // Do this the hard way by blocking ...
5853 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5854 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5855 // Only for SPARC >= V8PlusA
5856 #if defined(__sparc) && defined(COMPILER2)
5857 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5858 #endif
5859 int status = os::Solaris::mutex_lock(_mutex);
5860 assert_status(status == 0, status, "mutex_lock");
5861 guarantee (_nParked == 0, "invariant") ;
5862 ++ _nParked ;
5863 while (_Event < 0) {
5864 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5865 // Treat this the same as if the wait was interrupted
5866 // With usr/lib/lwp going to kernel, always handle ETIME
5867 status = os::Solaris::cond_wait(_cond, _mutex);
5868 if (status == ETIME) status = EINTR ;
5869 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5870 }
5871 -- _nParked ;
5872 _Event = 0 ;
5873 status = os::Solaris::mutex_unlock(_mutex);
5874 assert_status(status == 0, status, "mutex_unlock");
5875 // Paranoia to ensure our locked and lock-free paths interact
5876 // correctly with each other.
5877 OrderAccess::fence();
5878 }
5879 }
5880
5881 int os::PlatformEvent::park(jlong millis) {
5882 guarantee (_nParked == 0, "invariant") ;
5883 int v ;
5884 for (;;) {
5885 v = _Event ;
5886 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5887 }
5888 guarantee (v >= 0, "invariant") ;
5889 if (v != 0) return OS_OK ;
5890
5891 int ret = OS_TIMEOUT;
5892 timestruc_t abst;
5893 compute_abstime (&abst, millis);
5894
5895 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5896 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5897 // Only for SPARC >= V8PlusA
5898 #if defined(__sparc) && defined(COMPILER2)
5899 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5900 #endif
5901 int status = os::Solaris::mutex_lock(_mutex);
5902 assert_status(status == 0, status, "mutex_lock");
5903 guarantee (_nParked == 0, "invariant") ;
5904 ++ _nParked ;
5905 while (_Event < 0) {
5906 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5907 assert_status(status == 0 || status == EINTR ||
5908 status == ETIME || status == ETIMEDOUT,
5909 status, "cond_timedwait");
5910 if (!FilterSpuriousWakeups) break ; // previous semantics
5911 if (status == ETIME || status == ETIMEDOUT) break ;
5912 // We consume and ignore EINTR and spurious wakeups.
5913 }
5914 -- _nParked ;
5915 if (_Event >= 0) ret = OS_OK ;
5916 _Event = 0 ;
5917 status = os::Solaris::mutex_unlock(_mutex);
5918 assert_status(status == 0, status, "mutex_unlock");
5919 // Paranoia to ensure our locked and lock-free paths interact
5920 // correctly with each other.
5921 OrderAccess::fence();
5922 return ret;
5923 }
5924
5925 void os::PlatformEvent::unpark() {
5926 // Transitions for _Event:
5927 // 0 :=> 1
5928 // 1 :=> 1
5929 // -1 :=> either 0 or 1; must signal target thread
5930 // That is, we can safely transition _Event from -1 to either
5931 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
5932 // unpark() calls.
5933 // See also: "Semaphores in Plan 9" by Mullender & Cox
5934 //
5935 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5936 // that it will take two back-to-back park() calls for the owning
5937 // thread to block. This has the benefit of forcing a spurious return
5938 // from the first park() call after an unpark() call which will help
5939 // shake out uses of park() and unpark() without condition variables.
5940
5941 if (Atomic::xchg(1, &_Event) >= 0) return;
5942
5943 // If the thread associated with the event was parked, wake it.
5944 // Wait for the thread assoc with the PlatformEvent to vacate.
5945 int status = os::Solaris::mutex_lock(_mutex);
5946 assert_status(status == 0, status, "mutex_lock");
5947 int AnyWaiters = _nParked;
5948 status = os::Solaris::mutex_unlock(_mutex);
5949 assert_status(status == 0, status, "mutex_unlock");
5950 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5951 if (AnyWaiters != 0) {
5952 // We intentional signal *after* dropping the lock
5953 // to avoid a common class of futile wakeups.
5954 status = os::Solaris::cond_signal(_cond);
5955 assert_status(status == 0, status, "cond_signal");
5956 }
5957 }
5958
5959 // JSR166
5960 // -------------------------------------------------------
5961
5962 /*
5963 * The solaris and linux implementations of park/unpark are fairly
5964 * conservative for now, but can be improved. They currently use a
5965 * mutex/condvar pair, plus _counter.
5966 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5967 * sets count to 1 and signals condvar. Only one thread ever waits
5968 * on the condvar. Contention seen when trying to park implies that someone
5969 * is unparking you, so don't wait. And spurious returns are fine, so there
5970 * is no need to track notifications.
5971 */
5972
5973 #define MAX_SECS 100000000
5974 /*
5975 * This code is common to linux and solaris and will be moved to a
5976 * common place in dolphin.
5977 *
5978 * The passed in time value is either a relative time in nanoseconds
5979 * or an absolute time in milliseconds. Either way it has to be unpacked
5980 * into suitable seconds and nanoseconds components and stored in the
5981 * given timespec structure.
5982 * Given time is a 64-bit value and the time_t used in the timespec is only
5983 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5984 * overflow if times way in the future are given. Further on Solaris versions
5985 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5986 * number of seconds, in abstime, is less than current_time + 100,000,000.
5987 * As it will be 28 years before "now + 100000000" will overflow we can
5988 * ignore overflow and just impose a hard-limit on seconds using the value
5989 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5990 * years from "now".
5991 */
5992 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5993 assert (time > 0, "convertTime");
5994
5995 struct timeval now;
5996 int status = gettimeofday(&now, NULL);
5997 assert(status == 0, "gettimeofday");
5998
5999 time_t max_secs = now.tv_sec + MAX_SECS;
6000
6001 if (isAbsolute) {
6002 jlong secs = time / 1000;
6003 if (secs > max_secs) {
6004 absTime->tv_sec = max_secs;
6005 }
6006 else {
6007 absTime->tv_sec = secs;
6008 }
6009 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6010 }
6011 else {
6012 jlong secs = time / NANOSECS_PER_SEC;
6013 if (secs >= MAX_SECS) {
6014 absTime->tv_sec = max_secs;
6015 absTime->tv_nsec = 0;
6016 }
6017 else {
6018 absTime->tv_sec = now.tv_sec + secs;
6019 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6020 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6021 absTime->tv_nsec -= NANOSECS_PER_SEC;
6022 ++absTime->tv_sec; // note: this must be <= max_secs
6023 }
6024 }
6025 }
6026 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6027 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6028 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6029 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6030 }
6031
6032 void Parker::park(bool isAbsolute, jlong time) {
6033 // Ideally we'd do something useful while spinning, such
6034 // as calling unpackTime().
6035
6036 // Optional fast-path check:
6037 // Return immediately if a permit is available.
6038 // We depend on Atomic::xchg() having full barrier semantics
6039 // since we are doing a lock-free update to _counter.
6040 if (Atomic::xchg(0, &_counter) > 0) return;
6041
6042 // Optional fast-exit: Check interrupt before trying to wait
6043 Thread* thread = Thread::current();
6044 assert(thread->is_Java_thread(), "Must be JavaThread");
6045 JavaThread *jt = (JavaThread *)thread;
6046 if (Thread::is_interrupted(thread, false)) {
6047 return;
6048 }
6049
6050 // First, demultiplex/decode time arguments
6051 timespec absTime;
6052 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6053 return;
6054 }
6055 if (time > 0) {
6056 // Warning: this code might be exposed to the old Solaris time
6057 // round-down bugs. Grep "roundingFix" for details.
6058 unpackTime(&absTime, isAbsolute, time);
6059 }
6060
6061 // Enter safepoint region
6062 // Beware of deadlocks such as 6317397.
6063 // The per-thread Parker:: _mutex is a classic leaf-lock.
6064 // In particular a thread must never block on the Threads_lock while
6065 // holding the Parker:: mutex. If safepoints are pending both the
6066 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6067 ThreadBlockInVM tbivm(jt);
6068
6069 // Don't wait if cannot get lock since interference arises from
6070 // unblocking. Also. check interrupt before trying wait
6071 if (Thread::is_interrupted(thread, false) ||
6072 os::Solaris::mutex_trylock(_mutex) != 0) {
6073 return;
6074 }
6075
6076 int status ;
6077
6078 if (_counter > 0) { // no wait needed
6079 _counter = 0;
6080 status = os::Solaris::mutex_unlock(_mutex);
6081 assert (status == 0, "invariant") ;
6082 // Paranoia to ensure our locked and lock-free paths interact
6083 // correctly with each other and Java-level accesses.
6084 OrderAccess::fence();
6085 return;
6086 }
6087
6088 #ifdef ASSERT
6089 // Don't catch signals while blocked; let the running threads have the signals.
6090 // (This allows a debugger to break into the running thread.)
6091 sigset_t oldsigs;
6092 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6093 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6094 #endif
6095
6096 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6097 jt->set_suspend_equivalent();
6098 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6099
6100 // Do this the hard way by blocking ...
6101 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6102 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6103 // Only for SPARC >= V8PlusA
6104 #if defined(__sparc) && defined(COMPILER2)
6105 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6106 #endif
6107
6108 if (time == 0) {
6109 status = os::Solaris::cond_wait (_cond, _mutex) ;
6110 } else {
6111 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6112 }
6113 // Note that an untimed cond_wait() can sometimes return ETIME on older
6114 // versions of the Solaris.
6115 assert_status(status == 0 || status == EINTR ||
6116 status == ETIME || status == ETIMEDOUT,
6117 status, "cond_timedwait");
6118
6119 #ifdef ASSERT
6120 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6121 #endif
6122 _counter = 0 ;
6123 status = os::Solaris::mutex_unlock(_mutex);
6124 assert_status(status == 0, status, "mutex_unlock") ;
6125 // Paranoia to ensure our locked and lock-free paths interact
6126 // correctly with each other and Java-level accesses.
6127 OrderAccess::fence();
6128
6129 // If externally suspended while waiting, re-suspend
6130 if (jt->handle_special_suspend_equivalent_condition()) {
6131 jt->java_suspend_self();
6132 }
6133 }
6134
6135 void Parker::unpark() {
6136 int s, status ;
6137 status = os::Solaris::mutex_lock (_mutex) ;
6138 assert (status == 0, "invariant") ;
6139 s = _counter;
6140 _counter = 1;
6141 status = os::Solaris::mutex_unlock (_mutex) ;
6142 assert (status == 0, "invariant") ;
6143
6144 if (s < 1) {
6145 status = os::Solaris::cond_signal (_cond) ;
6146 assert (status == 0, "invariant") ;
6147 }
6148 }
6149
6150 extern char** environ;
6151
6152 // Run the specified command in a separate process. Return its exit value,
6153 // or -1 on failure (e.g. can't fork a new process).
6154 // Unlike system(), this function can be called from signal handler. It
6155 // doesn't block SIGINT et al.
6156 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
6157 char * argv[4];
6158 argv[0] = (char *)"sh";
6159 argv[1] = (char *)"-c";
6160 argv[2] = cmd;
6161 argv[3] = NULL;
6162
6163 // fork is async-safe, fork1 is not so can't use in signal handler
6164 pid_t pid;
6165 Thread* t = ThreadLocalStorage::get_thread_slow();
6166 if (t != NULL && t->is_inside_signal_handler()) {
6167 pid = fork();
6168 } else {
6169 pid = fork1();
6170 }
6171
6172 if (pid < 0) {
6173 // fork failed
6174 warning("fork failed: %s", strerror(errno));
6175 return -1;
6176
6177 } else if (pid == 0) {
6178 // child process
6179
6180 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6181 execve("/usr/bin/sh", argv, environ);
6182
6183 // execve failed
6184 _exit(-1);
6185
6186 } else {
6187 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6188 // care about the actual exit code, for now.
6189
6190 int status;
6191
6192 // Wait for the child process to exit. This returns immediately if
6193 // the child has already exited. */
6194 while (waitpid(pid, &status, 0) < 0) {
6195 switch (errno) {
6196 case ECHILD: return 0;
6197 case EINTR: break;
6198 default: return -1;
6199 }
6200 }
6201
6202 if (WIFEXITED(status)) {
6203 // The child exited normally; get its exit code.
6204 return WEXITSTATUS(status);
6205 } else if (WIFSIGNALED(status)) {
6206 // The child exited because of a signal
6207 // The best value to return is 0x80 + signal number,
6208 // because that is what all Unix shells do, and because
6209 // it allows callers to distinguish between process exit and
6210 // process death by signal.
6211 return 0x80 + WTERMSIG(status);
6212 } else {
6213 // Unknown exit code; pass it through
6214 return status;
6215 }
6216 }
6217 }
6218
6219 // is_headless_jre()
6220 //
6221 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6222 // in order to report if we are running in a headless jre
6223 //
6224 // Since JDK8 xawt/libmawt.so was moved into the same directory
6225 // as libawt.so, and renamed libawt_xawt.so
6226 //
6227 bool os::is_headless_jre() {
6228 struct stat statbuf;
6229 char buf[MAXPATHLEN];
6230 char libmawtpath[MAXPATHLEN];
6231 const char *xawtstr = "/xawt/libmawt.so";
6232 const char *new_xawtstr = "/libawt_xawt.so";
6233 char *p;
6234
6235 // Get path to libjvm.so
6236 os::jvm_path(buf, sizeof(buf));
6237
6238 // Get rid of libjvm.so
6239 p = strrchr(buf, '/');
6240 if (p == NULL) return false;
6241 else *p = '\0';
6242
6243 // Get rid of client or server
6244 p = strrchr(buf, '/');
6245 if (p == NULL) return false;
6246 else *p = '\0';
6247
6248 // check xawt/libmawt.so
6249 strcpy(libmawtpath, buf);
6250 strcat(libmawtpath, xawtstr);
6251 if (::stat(libmawtpath, &statbuf) == 0) return false;
6252
6253 // check libawt_xawt.so
6254 strcpy(libmawtpath, buf);
6255 strcat(libmawtpath, new_xawtstr);
6256 if (::stat(libmawtpath, &statbuf) == 0) return false;
6257
6258 return true;
6259 }
6260
6261 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6262 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6263 }
6264
6265 int os::close(int fd) {
6266 return ::close(fd);
6267 }
6268
6269 int os::socket_close(int fd) {
6270 return ::close(fd);
6271 }
6272
6273 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6274 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6275 }
6276
6277 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6278 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6279 }
6280
6281 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6282 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6283 }
6284
6285 // As both poll and select can be interrupted by signals, we have to be
6286 // prepared to restart the system call after updating the timeout, unless
6287 // a poll() is done with timeout == -1, in which case we repeat with this
6288 // "wait forever" value.
6289
6290 int os::timeout(int fd, long timeout) {
6291 int res;
6292 struct timeval t;
6293 julong prevtime, newtime;
6294 static const char* aNull = 0;
6295 struct pollfd pfd;
6296 pfd.fd = fd;
6297 pfd.events = POLLIN;
6298
6299 gettimeofday(&t, &aNull);
6300 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6301
6302 for(;;) {
6303 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6304 if(res == OS_ERR && errno == EINTR) {
6305 if(timeout != -1) {
6306 gettimeofday(&t, &aNull);
6307 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6308 timeout -= newtime - prevtime;
6309 if(timeout <= 0)
6310 return OS_OK;
6311 prevtime = newtime;
6312 }
6313 } else return res;
6314 }
6315 }
6316
6317 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6318 int _result;
6319 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6320 os::Solaris::clear_interrupted);
6321
6322 // Depending on when thread interruption is reset, _result could be
6323 // one of two values when errno == EINTR
6324
6325 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6326 && (errno == EINTR)) {
6327 /* restarting a connect() changes its errno semantics */
6328 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6329 os::Solaris::clear_interrupted);
6330 /* undo these changes */
6331 if (_result == OS_ERR) {
6332 if (errno == EALREADY) {
6333 errno = EINPROGRESS; /* fall through */
6334 } else if (errno == EISCONN) {
6335 errno = 0;
6336 return OS_OK;
6337 }
6338 }
6339 }
6340 return _result;
6341 }
6342
6343 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6344 if (fd < 0) {
6345 return OS_ERR;
6346 }
6347 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6348 os::Solaris::clear_interrupted);
6349 }
6350
6351 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6352 sockaddr* from, socklen_t* fromlen) {
6353 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6354 os::Solaris::clear_interrupted);
6355 }
6356
6357 int os::sendto(int fd, char* buf, size_t len, uint flags,
6358 struct sockaddr* to, socklen_t tolen) {
6359 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6360 os::Solaris::clear_interrupted);
6361 }
6362
6363 int os::socket_available(int fd, jint *pbytes) {
6364 if (fd < 0) {
6365 return OS_OK;
6366 }
6367 int ret;
6368 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6369 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6370 // is expected to return 0 on failure and 1 on success to the jdk.
6371 return (ret == OS_ERR) ? 0 : 1;
6372 }
6373
6374 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6375 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6376 os::Solaris::clear_interrupted);
6377 }
6378
6379 // Get the default path to the core file
6380 // Returns the length of the string
6381 int os::get_core_path(char* buffer, size_t bufferSize) {
6382 const char* p = get_current_directory(buffer, bufferSize);
6383
6384 if (p == NULL) {
6385 assert(p != NULL, "failed to get current directory");
6386 return 0;
6387 }
6388
6389 return strlen(buffer);
6390 }
6391
6392 #ifndef PRODUCT
6393 void TestReserveMemorySpecial_test() {
6394 // No tests available for this platform
6395 }
6396 #endif