1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "os_solaris.inline.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/interfaceSupport.inline.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/orderAccess.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/threadCritical.hpp"
60 #include "runtime/timer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "semaphore_posix.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/macros.hpp"
72 #include "utilities/vmError.hpp"
73
74 // put OS-includes here
75 # include <dlfcn.h>
76 # include <errno.h>
77 # include <exception>
78 # include <link.h>
79 # include <poll.h>
80 # include <pthread.h>
81 # include <schedctl.h>
82 # include <setjmp.h>
83 # include <signal.h>
84 # include <stdio.h>
85 # include <alloca.h>
86 # include <sys/filio.h>
87 # include <sys/ipc.h>
88 # include <sys/lwp.h>
89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
90 # include <sys/mman.h>
91 # include <sys/processor.h>
92 # include <sys/procset.h>
93 # include <sys/pset.h>
94 # include <sys/resource.h>
95 # include <sys/shm.h>
96 # include <sys/socket.h>
97 # include <sys/stat.h>
98 # include <sys/systeminfo.h>
99 # include <sys/time.h>
100 # include <sys/times.h>
101 # include <sys/types.h>
102 # include <sys/wait.h>
103 # include <sys/utsname.h>
104 # include <thread.h>
105 # include <unistd.h>
106 # include <sys/priocntl.h>
107 # include <sys/rtpriocntl.h>
108 # include <sys/tspriocntl.h>
109 # include <sys/iapriocntl.h>
110 # include <sys/fxpriocntl.h>
111 # include <sys/loadavg.h>
112 # include <string.h>
113 # include <stdio.h>
114
115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
116 # include <sys/procfs.h> // see comment in <sys/procfs.h>
117
118 #define MAX_PATH (2 * K)
119
120 // for timer info max values which include all bits
121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
122
123
124 // Here are some liblgrp types from sys/lgrp_user.h to be able to
125 // compile on older systems without this header file.
126
127 #ifndef MADV_ACCESS_LWP
128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
129 #endif
130 #ifndef MADV_ACCESS_MANY
131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
132 #endif
133
134 #ifndef LGRP_RSRC_CPU
135 #define LGRP_RSRC_CPU 0 /* CPU resources */
136 #endif
137 #ifndef LGRP_RSRC_MEM
138 #define LGRP_RSRC_MEM 1 /* memory resources */
139 #endif
140
141 // Values for ThreadPriorityPolicy == 1
142 int prio_policy1[CriticalPriority+1] = {
143 -99999, 0, 16, 32, 48, 64,
144 80, 96, 112, 124, 127, 127 };
145
146 // System parameters used internally
147 static clock_t clock_tics_per_sec = 100;
148
149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
150 static bool enabled_extended_FILE_stdio = false;
151
152 // For diagnostics to print a message once. see run_periodic_checks
153 static bool check_addr0_done = false;
154 static sigset_t check_signal_done;
155 static bool check_signals = true;
156
157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
159
160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
161
162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
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 = align_up(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 void os::Solaris::try_enable_extended_io() {
249 typedef int (*enable_extended_FILE_stdio_t)(int, int);
250
251 if (!UseExtendedFileIO) {
252 return;
253 }
254
255 enable_extended_FILE_stdio_t enabler =
256 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
257 "enable_extended_FILE_stdio");
258 if (enabler) {
259 enabler(-1, -1);
260 }
261 }
262
263 static int _processors_online = 0;
264
265 jint os::Solaris::_os_thread_limit = 0;
266 volatile jint os::Solaris::_os_thread_count = 0;
267
268 julong os::available_memory() {
269 return Solaris::available_memory();
270 }
271
272 julong os::Solaris::available_memory() {
273 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
274 }
275
276 julong os::Solaris::_physical_memory = 0;
277
278 julong os::physical_memory() {
279 return Solaris::physical_memory();
280 }
281
282 static hrtime_t first_hrtime = 0;
283 static const hrtime_t hrtime_hz = 1000*1000*1000;
284 static volatile hrtime_t max_hrtime = 0;
285
286
287 void os::Solaris::initialize_system_info() {
288 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
289 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
290 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
291 (julong)sysconf(_SC_PAGESIZE);
292 }
293
294 uint os::processor_id() {
295 const processorid_t id = ::getcpuid();
296 assert(id >= 0 && id < _processor_count, "Invalid processor id");
297 return (uint)id;
298 }
299
300 int os::active_processor_count() {
301 // User has overridden the number of active processors
302 if (ActiveProcessorCount > 0) {
303 log_trace(os)("active_processor_count: "
304 "active processor count set by user : %d",
305 ActiveProcessorCount);
306 return ActiveProcessorCount;
307 }
308
309 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
310 pid_t pid = getpid();
311 psetid_t pset = PS_NONE;
312 // Are we running in a processor set or is there any processor set around?
313 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
314 uint_t pset_cpus;
315 // Query the number of cpus available to us.
316 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
317 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
318 _processors_online = pset_cpus;
319 return pset_cpus;
320 }
321 }
322 // Otherwise return number of online cpus
323 return online_cpus;
324 }
325
326 static bool find_processors_in_pset(psetid_t pset,
327 processorid_t** id_array,
328 uint_t* id_length) {
329 bool result = false;
330 // Find the number of processors in the processor set.
331 if (pset_info(pset, NULL, id_length, NULL) == 0) {
332 // Make up an array to hold their ids.
333 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
334 // Fill in the array with their processor ids.
335 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
336 result = true;
337 }
338 }
339 return result;
340 }
341
342 // Callers of find_processors_online() must tolerate imprecise results --
343 // the system configuration can change asynchronously because of DR
344 // or explicit psradm operations.
345 //
346 // We also need to take care that the loop (below) terminates as the
347 // number of processors online can change between the _SC_NPROCESSORS_ONLN
348 // request and the loop that builds the list of processor ids. Unfortunately
349 // there's no reliable way to determine the maximum valid processor id,
350 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
351 // man pages, which claim the processor id set is "sparse, but
352 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
353 // exit the loop.
354 //
355 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
356 // not available on S8.0.
357
358 static bool find_processors_online(processorid_t** id_array,
359 uint* id_length) {
360 const processorid_t MAX_PROCESSOR_ID = 100000;
361 // Find the number of processors online.
362 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
363 // Make up an array to hold their ids.
364 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
365 // Processors need not be numbered consecutively.
366 long found = 0;
367 processorid_t next = 0;
368 while (found < *id_length && next < MAX_PROCESSOR_ID) {
369 processor_info_t info;
370 if (processor_info(next, &info) == 0) {
371 // NB, PI_NOINTR processors are effectively online ...
372 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
373 (*id_array)[found] = next;
374 found += 1;
375 }
376 }
377 next += 1;
378 }
379 if (found < *id_length) {
380 // The loop above didn't identify the expected number of processors.
381 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
382 // and re-running the loop, above, but there's no guarantee of progress
383 // if the system configuration is in flux. Instead, we just return what
384 // we've got. Note that in the worst case find_processors_online() could
385 // return an empty set. (As a fall-back in the case of the empty set we
386 // could just return the ID of the current processor).
387 *id_length = found;
388 }
389
390 return true;
391 }
392
393 static bool assign_distribution(processorid_t* id_array,
394 uint id_length,
395 uint* distribution,
396 uint distribution_length) {
397 // We assume we can assign processorid_t's to uint's.
398 assert(sizeof(processorid_t) == sizeof(uint),
399 "can't convert processorid_t to uint");
400 // Quick check to see if we won't succeed.
401 if (id_length < distribution_length) {
402 return false;
403 }
404 // Assign processor ids to the distribution.
405 // Try to shuffle processors to distribute work across boards,
406 // assuming 4 processors per board.
407 const uint processors_per_board = ProcessDistributionStride;
408 // Find the maximum processor id.
409 processorid_t max_id = 0;
410 for (uint m = 0; m < id_length; m += 1) {
411 max_id = MAX2(max_id, id_array[m]);
412 }
413 // The next id, to limit loops.
414 const processorid_t limit_id = max_id + 1;
415 // Make up markers for available processors.
416 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
417 for (uint c = 0; c < limit_id; c += 1) {
418 available_id[c] = false;
419 }
420 for (uint a = 0; a < id_length; a += 1) {
421 available_id[id_array[a]] = true;
422 }
423 // Step by "boards", then by "slot", copying to "assigned".
424 // NEEDS_CLEANUP: The assignment of processors should be stateful,
425 // remembering which processors have been assigned by
426 // previous calls, etc., so as to distribute several
427 // independent calls of this method. What we'd like is
428 // It would be nice to have an API that let us ask
429 // how many processes are bound to a processor,
430 // but we don't have that, either.
431 // In the short term, "board" is static so that
432 // subsequent distributions don't all start at board 0.
433 static uint board = 0;
434 uint assigned = 0;
435 // Until we've found enough processors ....
436 while (assigned < distribution_length) {
437 // ... find the next available processor in the board.
438 for (uint slot = 0; slot < processors_per_board; slot += 1) {
439 uint try_id = board * processors_per_board + slot;
440 if ((try_id < limit_id) && (available_id[try_id] == true)) {
441 distribution[assigned] = try_id;
442 available_id[try_id] = false;
443 assigned += 1;
444 break;
445 }
446 }
447 board += 1;
448 if (board * processors_per_board + 0 >= limit_id) {
449 board = 0;
450 }
451 }
452 if (available_id != NULL) {
453 FREE_C_HEAP_ARRAY(bool, available_id);
454 }
455 return true;
456 }
457
458 void os::set_native_thread_name(const char *name) {
459 if (Solaris::_pthread_setname_np != NULL) {
460 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
461 // but we explicitly copy into a size-limited buffer to avoid any
462 // possible overflow.
463 char buf[32];
464 snprintf(buf, sizeof(buf), "%s", name);
465 buf[sizeof(buf) - 1] = '\0';
466 Solaris::_pthread_setname_np(pthread_self(), buf);
467 }
468 }
469
470 bool os::distribute_processes(uint length, uint* distribution) {
471 bool result = false;
472 // Find the processor id's of all the available CPUs.
473 processorid_t* id_array = NULL;
474 uint id_length = 0;
475 // There are some races between querying information and using it,
476 // since processor sets can change dynamically.
477 psetid_t pset = PS_NONE;
478 // Are we running in a processor set?
479 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
480 result = find_processors_in_pset(pset, &id_array, &id_length);
481 } else {
482 result = find_processors_online(&id_array, &id_length);
483 }
484 if (result == true) {
485 if (id_length >= length) {
486 result = assign_distribution(id_array, id_length, distribution, length);
487 } else {
488 result = false;
489 }
490 }
491 if (id_array != NULL) {
492 FREE_C_HEAP_ARRAY(processorid_t, id_array);
493 }
494 return result;
495 }
496
497 bool os::bind_to_processor(uint processor_id) {
498 // We assume that a processorid_t can be stored in a uint.
499 assert(sizeof(uint) == sizeof(processorid_t),
500 "can't convert uint to processorid_t");
501 int bind_result =
502 processor_bind(P_LWPID, // bind LWP.
503 P_MYID, // bind current LWP.
504 (processorid_t) processor_id, // id.
505 NULL); // don't return old binding.
506 return (bind_result == 0);
507 }
508
509 // Return true if user is running as root.
510
511 bool os::have_special_privileges() {
512 static bool init = false;
513 static bool privileges = false;
514 if (!init) {
515 privileges = (getuid() != geteuid()) || (getgid() != getegid());
516 init = true;
517 }
518 return privileges;
519 }
520
521
522 void os::init_system_properties_values() {
523 // The next steps are taken in the product version:
524 //
525 // Obtain the JAVA_HOME value from the location of libjvm.so.
526 // This library should be located at:
527 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
528 //
529 // If "/jre/lib/" appears at the right place in the path, then we
530 // assume libjvm.so is installed in a JDK and we use this path.
531 //
532 // Otherwise exit with message: "Could not create the Java virtual machine."
533 //
534 // The following extra steps are taken in the debugging version:
535 //
536 // If "/jre/lib/" does NOT appear at the right place in the path
537 // instead of exit check for $JAVA_HOME environment variable.
538 //
539 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
540 // then we append a fake suffix "hotspot/libjvm.so" to this path so
541 // it looks like libjvm.so is installed there
542 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
543 //
544 // Otherwise exit.
545 //
546 // Important note: if the location of libjvm.so changes this
547 // code needs to be changed accordingly.
548
549 // Base path of extensions installed on the system.
550 #define SYS_EXT_DIR "/usr/jdk/packages"
551 #define EXTENSIONS_DIR "/lib/ext"
552
553 // Buffer that fits several sprintfs.
554 // Note that the space for the colon and the trailing null are provided
555 // by the nulls included by the sizeof operator.
556 const size_t bufsize =
557 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
558 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
559 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
560 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
561
562 // sysclasspath, java_home, dll_dir
563 {
564 char *pslash;
565 os::jvm_path(buf, bufsize);
566
567 // Found the full path to libjvm.so.
568 // Now cut the path to <java_home>/jre if we can.
569 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
570 pslash = strrchr(buf, '/');
571 if (pslash != NULL) {
572 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
573 }
574 Arguments::set_dll_dir(buf);
575
576 if (pslash != NULL) {
577 pslash = strrchr(buf, '/');
578 if (pslash != NULL) {
579 *pslash = '\0'; // Get rid of /lib.
580 }
581 }
582 Arguments::set_java_home(buf);
583 set_boot_path('/', ':');
584 }
585
586 // Where to look for native libraries.
587 {
588 // Use dlinfo() to determine the correct java.library.path.
589 //
590 // If we're launched by the Java launcher, and the user
591 // does not set java.library.path explicitly on the commandline,
592 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
593 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
594 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
595 // /usr/lib), which is exactly what we want.
596 //
597 // If the user does set java.library.path, it completely
598 // overwrites this setting, and always has.
599 //
600 // If we're not launched by the Java launcher, we may
601 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
602 // settings. Again, dlinfo does exactly what we want.
603
604 Dl_serinfo info_sz, *info = &info_sz;
605 Dl_serpath *path;
606 char *library_path;
607 char *common_path = buf;
608
609 // Determine search path count and required buffer size.
610 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
611 FREE_C_HEAP_ARRAY(char, buf);
612 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
613 }
614
615 // Allocate new buffer and initialize.
616 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
617 info->dls_size = info_sz.dls_size;
618 info->dls_cnt = info_sz.dls_cnt;
619
620 // Obtain search path information.
621 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
622 FREE_C_HEAP_ARRAY(char, buf);
623 FREE_C_HEAP_ARRAY(char, info);
624 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
625 }
626
627 path = &info->dls_serpath[0];
628
629 // Note: Due to a legacy implementation, most of the library path
630 // is set in the launcher. This was to accomodate linking restrictions
631 // on legacy Solaris implementations (which are no longer supported).
632 // Eventually, all the library path setting will be done here.
633 //
634 // However, to prevent the proliferation of improperly built native
635 // libraries, the new path component /usr/jdk/packages is added here.
636
637 // Construct the invariant part of ld_library_path.
638 sprintf(common_path, SYS_EXT_DIR "/lib");
639
640 // Struct size is more than sufficient for the path components obtained
641 // through the dlinfo() call, so only add additional space for the path
642 // components explicitly added here.
643 size_t library_path_size = info->dls_size + strlen(common_path);
644 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
645 library_path[0] = '\0';
646
647 // Construct the desired Java library path from the linker's library
648 // search path.
649 //
650 // For compatibility, it is optimal that we insert the additional path
651 // components specific to the Java VM after those components specified
652 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
653 // infrastructure.
654 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
655 strcpy(library_path, common_path);
656 } else {
657 int inserted = 0;
658 int i;
659 for (i = 0; i < info->dls_cnt; i++, path++) {
660 uint_t flags = path->dls_flags & LA_SER_MASK;
661 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
662 strcat(library_path, common_path);
663 strcat(library_path, os::path_separator());
664 inserted = 1;
665 }
666 strcat(library_path, path->dls_name);
667 strcat(library_path, os::path_separator());
668 }
669 // Eliminate trailing path separator.
670 library_path[strlen(library_path)-1] = '\0';
671 }
672
673 // happens before argument parsing - can't use a trace flag
674 // tty->print_raw("init_system_properties_values: native lib path: ");
675 // tty->print_raw_cr(library_path);
676
677 // Callee copies into its own buffer.
678 Arguments::set_library_path(library_path);
679
680 FREE_C_HEAP_ARRAY(char, library_path);
681 FREE_C_HEAP_ARRAY(char, info);
682 }
683
684 // Extensions directories.
685 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
686 Arguments::set_ext_dirs(buf);
687
688 FREE_C_HEAP_ARRAY(char, buf);
689
690 #undef SYS_EXT_DIR
691 #undef EXTENSIONS_DIR
692 }
693
694 void os::breakpoint() {
695 BREAKPOINT;
696 }
697
698 bool os::obsolete_option(const JavaVMOption *option) {
699 if (!strncmp(option->optionString, "-Xt", 3)) {
700 return true;
701 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
702 return true;
703 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
704 return true;
705 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
706 return true;
707 }
708 return false;
709 }
710
711 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
712 address stackStart = (address)thread->stack_base();
713 address stackEnd = (address)(stackStart - (address)thread->stack_size());
714 if (sp < stackStart && sp >= stackEnd) return true;
715 return false;
716 }
717
718 extern "C" void breakpoint() {
719 // use debugger to set breakpoint here
720 }
721
722 static thread_t main_thread;
723
724 // Thread start routine for all newly created threads
725 extern "C" void* thread_native_entry(void* thread_addr) {
726 // Try to randomize the cache line index of hot stack frames.
727 // This helps when threads of the same stack traces evict each other's
728 // cache lines. The threads can be either from the same JVM instance, or
729 // from different JVM instances. The benefit is especially true for
730 // processors with hyperthreading technology.
731 static int counter = 0;
732 int pid = os::current_process_id();
733 alloca(((pid ^ counter++) & 7) * 128);
734
735 int prio;
736 Thread* thread = (Thread*)thread_addr;
737
738 thread->initialize_thread_current();
739
740 OSThread* osthr = thread->osthread();
741
742 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
743 thread->_schedctl = (void *) schedctl_init();
744
745 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
746 os::current_thread_id());
747
748 if (UseNUMA) {
749 int lgrp_id = os::numa_get_group_id();
750 if (lgrp_id != -1) {
751 thread->set_lgrp_id(lgrp_id);
752 }
753 }
754
755 // Our priority was set when we were created, and stored in the
756 // osthread, but couldn't be passed through to our LWP until now.
757 // So read back the priority and set it again.
758
759 if (osthr->thread_id() != -1) {
760 if (UseThreadPriorities) {
761 int prio = osthr->native_priority();
762 if (ThreadPriorityVerbose) {
763 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
764 INTPTR_FORMAT ", setting priority: %d\n",
765 osthr->thread_id(), osthr->lwp_id(), prio);
766 }
767 os::set_native_priority(thread, prio);
768 }
769 } else if (ThreadPriorityVerbose) {
770 warning("Can't set priority in _start routine, thread id hasn't been set\n");
771 }
772
773 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
774
775 // initialize signal mask for this thread
776 os::Solaris::hotspot_sigmask(thread);
777
778 thread->run();
779
780 // One less thread is executing
781 // When the VMThread gets here, the main thread may have already exited
782 // which frees the CodeHeap containing the Atomic::dec code
783 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
784 Atomic::dec(&os::Solaris::_os_thread_count);
785 }
786
787 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
788
789 // If a thread has not deleted itself ("delete this") as part of its
790 // termination sequence, we have to ensure thread-local-storage is
791 // cleared before we actually terminate. No threads should ever be
792 // deleted asynchronously with respect to their termination.
793 if (Thread::current_or_null_safe() != NULL) {
794 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
795 thread->clear_thread_current();
796 }
797
798 if (UseDetachedThreads) {
799 thr_exit(NULL);
800 ShouldNotReachHere();
801 }
802 return NULL;
803 }
804
805 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
806 // Allocate the OSThread object
807 OSThread* osthread = new OSThread(NULL, NULL);
808 if (osthread == NULL) return NULL;
809
810 // Store info on the Solaris thread into the OSThread
811 osthread->set_thread_id(thread_id);
812 osthread->set_lwp_id(_lwp_self());
813 thread->_schedctl = (void *) schedctl_init();
814
815 if (UseNUMA) {
816 int lgrp_id = os::numa_get_group_id();
817 if (lgrp_id != -1) {
818 thread->set_lgrp_id(lgrp_id);
819 }
820 }
821
822 if (ThreadPriorityVerbose) {
823 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
824 osthread->thread_id(), osthread->lwp_id());
825 }
826
827 // Initial thread state is INITIALIZED, not SUSPENDED
828 osthread->set_state(INITIALIZED);
829
830 return osthread;
831 }
832
833 void os::Solaris::hotspot_sigmask(Thread* thread) {
834 //Save caller's signal mask
835 sigset_t sigmask;
836 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
837 OSThread *osthread = thread->osthread();
838 osthread->set_caller_sigmask(sigmask);
839
840 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
841 if (!ReduceSignalUsage) {
842 if (thread->is_VM_thread()) {
843 // Only the VM thread handles BREAK_SIGNAL ...
844 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
845 } else {
846 // ... all other threads block BREAK_SIGNAL
847 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
848 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
849 }
850 }
851 }
852
853 bool os::create_attached_thread(JavaThread* thread) {
854 #ifdef ASSERT
855 thread->verify_not_published();
856 #endif
857 OSThread* osthread = create_os_thread(thread, thr_self());
858 if (osthread == NULL) {
859 return false;
860 }
861
862 // Initial thread state is RUNNABLE
863 osthread->set_state(RUNNABLE);
864 thread->set_osthread(osthread);
865
866 // initialize signal mask for this thread
867 // and save the caller's signal mask
868 os::Solaris::hotspot_sigmask(thread);
869
870 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
871 os::current_thread_id());
872
873 return true;
874 }
875
876 bool os::create_main_thread(JavaThread* thread) {
877 #ifdef ASSERT
878 thread->verify_not_published();
879 #endif
880 if (_starting_thread == NULL) {
881 _starting_thread = create_os_thread(thread, main_thread);
882 if (_starting_thread == NULL) {
883 return false;
884 }
885 }
886
887 // The primodial thread is runnable from the start
888 _starting_thread->set_state(RUNNABLE);
889
890 thread->set_osthread(_starting_thread);
891
892 // initialize signal mask for this thread
893 // and save the caller's signal mask
894 os::Solaris::hotspot_sigmask(thread);
895
896 return true;
897 }
898
899 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
900 static char* describe_thr_create_attributes(char* buf, size_t buflen,
901 size_t stacksize, long flags) {
902 stringStream ss(buf, buflen);
903 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
904 ss.print("flags: ");
905 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
906 #define ALL(X) \
907 X(THR_SUSPENDED) \
908 X(THR_DETACHED) \
909 X(THR_BOUND) \
910 X(THR_NEW_LWP) \
911 X(THR_DAEMON)
912 ALL(PRINT_FLAG)
913 #undef ALL
914 #undef PRINT_FLAG
915 return buf;
916 }
917
918 // return default stack size for thr_type
919 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
920 // default stack size when not specified by caller is 1M (2M for LP64)
921 size_t s = (BytesPerWord >> 2) * K * K;
922 return s;
923 }
924
925 bool os::create_thread(Thread* thread, ThreadType thr_type,
926 size_t req_stack_size) {
927 // Allocate the OSThread object
928 OSThread* osthread = new OSThread(NULL, NULL);
929 if (osthread == NULL) {
930 return false;
931 }
932
933 if (ThreadPriorityVerbose) {
934 char *thrtyp;
935 switch (thr_type) {
936 case vm_thread:
937 thrtyp = (char *)"vm";
938 break;
939 case cgc_thread:
940 thrtyp = (char *)"cgc";
941 break;
942 case pgc_thread:
943 thrtyp = (char *)"pgc";
944 break;
945 case java_thread:
946 thrtyp = (char *)"java";
947 break;
948 case compiler_thread:
949 thrtyp = (char *)"compiler";
950 break;
951 case watcher_thread:
952 thrtyp = (char *)"watcher";
953 break;
954 default:
955 thrtyp = (char *)"unknown";
956 break;
957 }
958 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
959 }
960
961 // calculate stack size if it's not specified by caller
962 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
963
964 // Initial state is ALLOCATED but not INITIALIZED
965 osthread->set_state(ALLOCATED);
966
967 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
968 // We got lots of threads. Check if we still have some address space left.
969 // Need to be at least 5Mb of unreserved address space. We do check by
970 // trying to reserve some.
971 const size_t VirtualMemoryBangSize = 20*K*K;
972 char* mem = os::reserve_memory(VirtualMemoryBangSize);
973 if (mem == NULL) {
974 delete osthread;
975 return false;
976 } else {
977 // Release the memory again
978 os::release_memory(mem, VirtualMemoryBangSize);
979 }
980 }
981
982 // Setup osthread because the child thread may need it.
983 thread->set_osthread(osthread);
984
985 // Create the Solaris thread
986 thread_t tid = 0;
987 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
988 int status;
989
990 // Mark that we don't have an lwp or thread id yet.
991 // In case we attempt to set the priority before the thread starts.
992 osthread->set_lwp_id(-1);
993 osthread->set_thread_id(-1);
994
995 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
996
997 char buf[64];
998 if (status == 0) {
999 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
1000 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1001 } else {
1002 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
1003 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1004 }
1005
1006 if (status != 0) {
1007 thread->set_osthread(NULL);
1008 // Need to clean up stuff we've allocated so far
1009 delete osthread;
1010 return false;
1011 }
1012
1013 Atomic::inc(&os::Solaris::_os_thread_count);
1014
1015 // Store info on the Solaris thread into the OSThread
1016 osthread->set_thread_id(tid);
1017
1018 // Remember that we created this thread so we can set priority on it
1019 osthread->set_vm_created();
1020
1021 // Most thread types will set an explicit priority before starting the thread,
1022 // but for those that don't we need a valid value to read back in thread_native_entry.
1023 osthread->set_native_priority(NormPriority);
1024
1025 // Initial thread state is INITIALIZED, not SUSPENDED
1026 osthread->set_state(INITIALIZED);
1027
1028 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1029 return true;
1030 }
1031
1032 debug_only(static bool signal_sets_initialized = false);
1033 static sigset_t unblocked_sigs, vm_sigs;
1034
1035 void os::Solaris::signal_sets_init() {
1036 // Should also have an assertion stating we are still single-threaded.
1037 assert(!signal_sets_initialized, "Already initialized");
1038 // Fill in signals that are necessarily unblocked for all threads in
1039 // the VM. Currently, we unblock the following signals:
1040 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1041 // by -Xrs (=ReduceSignalUsage));
1042 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1043 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1044 // the dispositions or masks wrt these signals.
1045 // Programs embedding the VM that want to use the above signals for their
1046 // own purposes must, at this time, use the "-Xrs" option to prevent
1047 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1048 // (See bug 4345157, and other related bugs).
1049 // In reality, though, unblocking these signals is really a nop, since
1050 // these signals are not blocked by default.
1051 sigemptyset(&unblocked_sigs);
1052 sigaddset(&unblocked_sigs, SIGILL);
1053 sigaddset(&unblocked_sigs, SIGSEGV);
1054 sigaddset(&unblocked_sigs, SIGBUS);
1055 sigaddset(&unblocked_sigs, SIGFPE);
1056 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1057
1058 if (!ReduceSignalUsage) {
1059 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1060 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1061 }
1062 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1063 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1064 }
1065 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1066 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1067 }
1068 }
1069 // Fill in signals that are blocked by all but the VM thread.
1070 sigemptyset(&vm_sigs);
1071 if (!ReduceSignalUsage) {
1072 sigaddset(&vm_sigs, BREAK_SIGNAL);
1073 }
1074 debug_only(signal_sets_initialized = true);
1075
1076 // For diagnostics only used in run_periodic_checks
1077 sigemptyset(&check_signal_done);
1078 }
1079
1080 // These are signals that are unblocked while a thread is running Java.
1081 // (For some reason, they get blocked by default.)
1082 sigset_t* os::Solaris::unblocked_signals() {
1083 assert(signal_sets_initialized, "Not initialized");
1084 return &unblocked_sigs;
1085 }
1086
1087 // These are the signals that are blocked while a (non-VM) thread is
1088 // running Java. Only the VM thread handles these signals.
1089 sigset_t* os::Solaris::vm_signals() {
1090 assert(signal_sets_initialized, "Not initialized");
1091 return &vm_sigs;
1092 }
1093
1094 void _handle_uncaught_cxx_exception() {
1095 VMError::report_and_die("An uncaught C++ exception");
1096 }
1097
1098
1099 // First crack at OS-specific initialization, from inside the new thread.
1100 void os::initialize_thread(Thread* thr) {
1101 if (is_primordial_thread()) {
1102 JavaThread* jt = (JavaThread *)thr;
1103 assert(jt != NULL, "Sanity check");
1104 size_t stack_size;
1105 address base = jt->stack_base();
1106 if (Arguments::created_by_java_launcher()) {
1107 // Use 2MB to allow for Solaris 7 64 bit mode.
1108 stack_size = JavaThread::stack_size_at_create() == 0
1109 ? 2048*K : JavaThread::stack_size_at_create();
1110
1111 // There are rare cases when we may have already used more than
1112 // the basic stack size allotment before this method is invoked.
1113 // Attempt to allow for a normally sized java_stack.
1114 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1115 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1116 } else {
1117 // 6269555: If we were not created by a Java launcher, i.e. if we are
1118 // running embedded in a native application, treat the primordial thread
1119 // as much like a native attached thread as possible. This means using
1120 // the current stack size from thr_stksegment(), unless it is too large
1121 // to reliably setup guard pages. A reasonable max size is 8MB.
1122 size_t current_size = current_stack_size();
1123 // This should never happen, but just in case....
1124 if (current_size == 0) current_size = 2 * K * K;
1125 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1126 }
1127 address bottom = align_up(base - stack_size, os::vm_page_size());;
1128 stack_size = (size_t)(base - bottom);
1129
1130 assert(stack_size > 0, "Stack size calculation problem");
1131
1132 if (stack_size > jt->stack_size()) {
1133 #ifndef PRODUCT
1134 struct rlimit limits;
1135 getrlimit(RLIMIT_STACK, &limits);
1136 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1137 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1138 #endif
1139 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1140 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1141 "See limit(1) to increase the stack size limit.",
1142 stack_size / K, jt->stack_size() / K);
1143 vm_exit(1);
1144 }
1145 assert(jt->stack_size() >= stack_size,
1146 "Attempt to map more stack than was allocated");
1147 jt->set_stack_size(stack_size);
1148 }
1149
1150 // With the T2 libthread (T1 is no longer supported) threads are always bound
1151 // and we use stackbanging in all cases.
1152
1153 os::Solaris::init_thread_fpu_state();
1154 std::set_terminate(_handle_uncaught_cxx_exception);
1155 }
1156
1157
1158
1159 // Free Solaris resources related to the OSThread
1160 void os::free_thread(OSThread* osthread) {
1161 assert(osthread != NULL, "os::free_thread but osthread not set");
1162
1163 // We are told to free resources of the argument thread,
1164 // but we can only really operate on the current thread.
1165 assert(Thread::current()->osthread() == osthread,
1166 "os::free_thread but not current thread");
1167
1168 // Restore caller's signal mask
1169 sigset_t sigmask = osthread->caller_sigmask();
1170 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1171
1172 delete osthread;
1173 }
1174
1175 void os::pd_start_thread(Thread* thread) {
1176 int status = thr_continue(thread->osthread()->thread_id());
1177 assert_status(status == 0, status, "thr_continue failed");
1178 }
1179
1180
1181 intx os::current_thread_id() {
1182 return (intx)thr_self();
1183 }
1184
1185 static pid_t _initial_pid = 0;
1186
1187 int os::current_process_id() {
1188 return (int)(_initial_pid ? _initial_pid : getpid());
1189 }
1190
1191 // gethrtime() should be monotonic according to the documentation,
1192 // but some virtualized platforms are known to break this guarantee.
1193 // getTimeNanos() must be guaranteed not to move backwards, so we
1194 // are forced to add a check here.
1195 inline hrtime_t getTimeNanos() {
1196 const hrtime_t now = gethrtime();
1197 const hrtime_t prev = max_hrtime;
1198 if (now <= prev) {
1199 return prev; // same or retrograde time;
1200 }
1201 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev);
1202 assert(obsv >= prev, "invariant"); // Monotonicity
1203 // If the CAS succeeded then we're done and return "now".
1204 // If the CAS failed and the observed value "obsv" is >= now then
1205 // we should return "obsv". If the CAS failed and now > obsv > prv then
1206 // some other thread raced this thread and installed a new value, in which case
1207 // we could either (a) retry the entire operation, (b) retry trying to install now
1208 // or (c) just return obsv. We use (c). No loop is required although in some cases
1209 // we might discard a higher "now" value in deference to a slightly lower but freshly
1210 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1211 // to (a) or (b) -- and greatly reduces coherence traffic.
1212 // We might also condition (c) on the magnitude of the delta between obsv and now.
1213 // Avoiding excessive CAS operations to hot RW locations is critical.
1214 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1215 return (prev == obsv) ? now : obsv;
1216 }
1217
1218 // Time since start-up in seconds to a fine granularity.
1219 // Used by VMSelfDestructTimer and the MemProfiler.
1220 double os::elapsedTime() {
1221 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1222 }
1223
1224 jlong os::elapsed_counter() {
1225 return (jlong)(getTimeNanos() - first_hrtime);
1226 }
1227
1228 jlong os::elapsed_frequency() {
1229 return hrtime_hz;
1230 }
1231
1232 // Return the real, user, and system times in seconds from an
1233 // arbitrary fixed point in the past.
1234 bool os::getTimesSecs(double* process_real_time,
1235 double* process_user_time,
1236 double* process_system_time) {
1237 struct tms ticks;
1238 clock_t real_ticks = times(&ticks);
1239
1240 if (real_ticks == (clock_t) (-1)) {
1241 return false;
1242 } else {
1243 double ticks_per_second = (double) clock_tics_per_sec;
1244 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1245 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1246 // For consistency return the real time from getTimeNanos()
1247 // converted to seconds.
1248 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1249
1250 return true;
1251 }
1252 }
1253
1254 bool os::supports_vtime() { return true; }
1255 bool os::enable_vtime() { return false; }
1256 bool os::vtime_enabled() { return false; }
1257
1258 double os::elapsedVTime() {
1259 return (double)gethrvtime() / (double)hrtime_hz;
1260 }
1261
1262 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1263 jlong os::javaTimeMillis() {
1264 timeval t;
1265 if (gettimeofday(&t, NULL) == -1) {
1266 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1267 }
1268 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1269 }
1270
1271 // Must return seconds+nanos since Jan 1 1970. This must use the same
1272 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1273 // we need better than 1ms accuracy
1274 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1275 timeval t;
1276 if (gettimeofday(&t, NULL) == -1) {
1277 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1278 }
1279 seconds = jlong(t.tv_sec);
1280 nanos = jlong(t.tv_usec) * 1000;
1281 }
1282
1283
1284 jlong os::javaTimeNanos() {
1285 return (jlong)getTimeNanos();
1286 }
1287
1288 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1289 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1290 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1291 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1292 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1293 }
1294
1295 char * os::local_time_string(char *buf, size_t buflen) {
1296 struct tm t;
1297 time_t long_time;
1298 time(&long_time);
1299 localtime_r(&long_time, &t);
1300 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1301 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1302 t.tm_hour, t.tm_min, t.tm_sec);
1303 return buf;
1304 }
1305
1306 // Note: os::shutdown() might be called very early during initialization, or
1307 // called from signal handler. Before adding something to os::shutdown(), make
1308 // sure it is async-safe and can handle partially initialized VM.
1309 void os::shutdown() {
1310
1311 // allow PerfMemory to attempt cleanup of any persistent resources
1312 perfMemory_exit();
1313
1314 // needs to remove object in file system
1315 AttachListener::abort();
1316
1317 // flush buffered output, finish log files
1318 ostream_abort();
1319
1320 // Check for abort hook
1321 abort_hook_t abort_hook = Arguments::abort_hook();
1322 if (abort_hook != NULL) {
1323 abort_hook();
1324 }
1325 }
1326
1327 // Note: os::abort() might be called very early during initialization, or
1328 // called from signal handler. Before adding something to os::abort(), make
1329 // sure it is async-safe and can handle partially initialized VM.
1330 void os::abort(bool dump_core, void* siginfo, const void* context) {
1331 os::shutdown();
1332 if (dump_core) {
1333 #ifndef PRODUCT
1334 fdStream out(defaultStream::output_fd());
1335 out.print_raw("Current thread is ");
1336 char buf[16];
1337 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1338 out.print_raw_cr(buf);
1339 out.print_raw_cr("Dumping core ...");
1340 #endif
1341 ::abort(); // dump core (for debugging)
1342 }
1343
1344 ::exit(1);
1345 }
1346
1347 // Die immediately, no exit hook, no abort hook, no cleanup.
1348 void os::die() {
1349 ::abort(); // dump core (for debugging)
1350 }
1351
1352 // DLL functions
1353
1354 const char* os::dll_file_extension() { return ".so"; }
1355
1356 // This must be hard coded because it's the system's temporary
1357 // directory not the java application's temp directory, ala java.io.tmpdir.
1358 const char* os::get_temp_directory() { return "/tmp"; }
1359
1360 // check if addr is inside libjvm.so
1361 bool os::address_is_in_vm(address addr) {
1362 static address libjvm_base_addr;
1363 Dl_info dlinfo;
1364
1365 if (libjvm_base_addr == NULL) {
1366 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1367 libjvm_base_addr = (address)dlinfo.dli_fbase;
1368 }
1369 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1370 }
1371
1372 if (dladdr((void *)addr, &dlinfo) != 0) {
1373 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1374 }
1375
1376 return false;
1377 }
1378
1379 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1380 static dladdr1_func_type dladdr1_func = NULL;
1381
1382 bool os::dll_address_to_function_name(address addr, char *buf,
1383 int buflen, int * offset,
1384 bool demangle) {
1385 // buf is not optional, but offset is optional
1386 assert(buf != NULL, "sanity check");
1387
1388 Dl_info dlinfo;
1389
1390 // dladdr1_func was initialized in os::init()
1391 if (dladdr1_func != NULL) {
1392 // yes, we have dladdr1
1393
1394 // Support for dladdr1 is checked at runtime; it may be
1395 // available even if the vm is built on a machine that does
1396 // not have dladdr1 support. Make sure there is a value for
1397 // RTLD_DL_SYMENT.
1398 #ifndef RTLD_DL_SYMENT
1399 #define RTLD_DL_SYMENT 1
1400 #endif
1401 #ifdef _LP64
1402 Elf64_Sym * info;
1403 #else
1404 Elf32_Sym * info;
1405 #endif
1406 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1407 RTLD_DL_SYMENT) != 0) {
1408 // see if we have a matching symbol that covers our address
1409 if (dlinfo.dli_saddr != NULL &&
1410 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1411 if (dlinfo.dli_sname != NULL) {
1412 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1413 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1414 }
1415 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1416 return true;
1417 }
1418 }
1419 // no matching symbol so try for just file info
1420 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1421 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1422 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1423 return true;
1424 }
1425 }
1426 }
1427 buf[0] = '\0';
1428 if (offset != NULL) *offset = -1;
1429 return false;
1430 }
1431
1432 // no, only dladdr is available
1433 if (dladdr((void *)addr, &dlinfo) != 0) {
1434 // see if we have a matching symbol
1435 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1436 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1437 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1438 }
1439 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1440 return true;
1441 }
1442 // no matching symbol so try for just file info
1443 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1444 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1445 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1446 return true;
1447 }
1448 }
1449 }
1450 buf[0] = '\0';
1451 if (offset != NULL) *offset = -1;
1452 return false;
1453 }
1454
1455 bool os::dll_address_to_library_name(address addr, char* buf,
1456 int buflen, int* offset) {
1457 // buf is not optional, but offset is optional
1458 assert(buf != NULL, "sanity check");
1459
1460 Dl_info dlinfo;
1461
1462 if (dladdr((void*)addr, &dlinfo) != 0) {
1463 if (dlinfo.dli_fname != NULL) {
1464 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1465 }
1466 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1467 *offset = addr - (address)dlinfo.dli_fbase;
1468 }
1469 return true;
1470 }
1471
1472 buf[0] = '\0';
1473 if (offset) *offset = -1;
1474 return false;
1475 }
1476
1477 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1478 Dl_info dli;
1479 // Sanity check?
1480 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1481 dli.dli_fname == NULL) {
1482 return 1;
1483 }
1484
1485 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1486 if (handle == NULL) {
1487 return 1;
1488 }
1489
1490 Link_map *map;
1491 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1492 if (map == NULL) {
1493 dlclose(handle);
1494 return 1;
1495 }
1496
1497 while (map->l_prev != NULL) {
1498 map = map->l_prev;
1499 }
1500
1501 while (map != NULL) {
1502 // Iterate through all map entries and call callback with fields of interest
1503 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1504 dlclose(handle);
1505 return 1;
1506 }
1507 map = map->l_next;
1508 }
1509
1510 dlclose(handle);
1511 return 0;
1512 }
1513
1514 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1515 outputStream * out = (outputStream *) param;
1516 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1517 return 0;
1518 }
1519
1520 void os::print_dll_info(outputStream * st) {
1521 st->print_cr("Dynamic libraries:"); st->flush();
1522 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1523 st->print_cr("Error: Cannot print dynamic libraries.");
1524 }
1525 }
1526
1527 // Loads .dll/.so and
1528 // in case of error it checks if .dll/.so was built for the
1529 // same architecture as Hotspot is running on
1530
1531 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1532 void * result= ::dlopen(filename, RTLD_LAZY);
1533 if (result != NULL) {
1534 // Successful loading
1535 return result;
1536 }
1537
1538 Elf32_Ehdr elf_head;
1539
1540 // Read system error message into ebuf
1541 // It may or may not be overwritten below
1542 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1543 ebuf[ebuflen-1]='\0';
1544 int diag_msg_max_length=ebuflen-strlen(ebuf);
1545 char* diag_msg_buf=ebuf+strlen(ebuf);
1546
1547 if (diag_msg_max_length==0) {
1548 // No more space in ebuf for additional diagnostics message
1549 return NULL;
1550 }
1551
1552
1553 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1554
1555 if (file_descriptor < 0) {
1556 // Can't open library, report dlerror() message
1557 return NULL;
1558 }
1559
1560 bool failed_to_read_elf_head=
1561 (sizeof(elf_head)!=
1562 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1563
1564 ::close(file_descriptor);
1565 if (failed_to_read_elf_head) {
1566 // file i/o error - report dlerror() msg
1567 return NULL;
1568 }
1569
1570 typedef struct {
1571 Elf32_Half code; // Actual value as defined in elf.h
1572 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1573 char elf_class; // 32 or 64 bit
1574 char endianess; // MSB or LSB
1575 char* name; // String representation
1576 } arch_t;
1577
1578 static const arch_t arch_array[]={
1579 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1580 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1581 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1582 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1583 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1584 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1585 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1586 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1587 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1588 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1589 };
1590
1591 #if (defined IA32)
1592 static Elf32_Half running_arch_code=EM_386;
1593 #elif (defined AMD64)
1594 static Elf32_Half running_arch_code=EM_X86_64;
1595 #elif (defined IA64)
1596 static Elf32_Half running_arch_code=EM_IA_64;
1597 #elif (defined __sparc) && (defined _LP64)
1598 static Elf32_Half running_arch_code=EM_SPARCV9;
1599 #elif (defined __sparc) && (!defined _LP64)
1600 static Elf32_Half running_arch_code=EM_SPARC;
1601 #elif (defined __powerpc64__)
1602 static Elf32_Half running_arch_code=EM_PPC64;
1603 #elif (defined __powerpc__)
1604 static Elf32_Half running_arch_code=EM_PPC;
1605 #elif (defined ARM)
1606 static Elf32_Half running_arch_code=EM_ARM;
1607 #else
1608 #error Method os::dll_load requires that one of following is defined:\
1609 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1610 #endif
1611
1612 // Identify compatability class for VM's architecture and library's architecture
1613 // Obtain string descriptions for architectures
1614
1615 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1616 int running_arch_index=-1;
1617
1618 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1619 if (running_arch_code == arch_array[i].code) {
1620 running_arch_index = i;
1621 }
1622 if (lib_arch.code == arch_array[i].code) {
1623 lib_arch.compat_class = arch_array[i].compat_class;
1624 lib_arch.name = arch_array[i].name;
1625 }
1626 }
1627
1628 assert(running_arch_index != -1,
1629 "Didn't find running architecture code (running_arch_code) in arch_array");
1630 if (running_arch_index == -1) {
1631 // Even though running architecture detection failed
1632 // we may still continue with reporting dlerror() message
1633 return NULL;
1634 }
1635
1636 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1637 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1638 return NULL;
1639 }
1640
1641 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1642 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1643 return NULL;
1644 }
1645
1646 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1647 if (lib_arch.name!=NULL) {
1648 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1649 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1650 lib_arch.name, arch_array[running_arch_index].name);
1651 } else {
1652 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1653 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1654 lib_arch.code,
1655 arch_array[running_arch_index].name);
1656 }
1657 }
1658
1659 return NULL;
1660 }
1661
1662 void* os::dll_lookup(void* handle, const char* name) {
1663 return dlsym(handle, name);
1664 }
1665
1666 void* os::get_default_process_handle() {
1667 return (void*)::dlopen(NULL, RTLD_LAZY);
1668 }
1669
1670 static inline time_t get_mtime(const char* filename) {
1671 struct stat st;
1672 int ret = os::stat(filename, &st);
1673 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1674 return st.st_mtime;
1675 }
1676
1677 int os::compare_file_modified_times(const char* file1, const char* file2) {
1678 time_t t1 = get_mtime(file1);
1679 time_t t2 = get_mtime(file2);
1680 return t1 - t2;
1681 }
1682
1683 static bool _print_ascii_file(const char* filename, outputStream* st) {
1684 int fd = ::open(filename, O_RDONLY);
1685 if (fd == -1) {
1686 return false;
1687 }
1688
1689 char buf[32];
1690 int bytes;
1691 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1692 st->print_raw(buf, bytes);
1693 }
1694
1695 ::close(fd);
1696
1697 return true;
1698 }
1699
1700 void os::print_os_info_brief(outputStream* st) {
1701 os::Solaris::print_distro_info(st);
1702
1703 os::Posix::print_uname_info(st);
1704
1705 os::Solaris::print_libversion_info(st);
1706 }
1707
1708 void os::print_os_info(outputStream* st) {
1709 st->print("OS:");
1710
1711 os::Solaris::print_distro_info(st);
1712
1713 os::Posix::print_uname_info(st);
1714
1715 os::Solaris::print_libversion_info(st);
1716
1717 os::Posix::print_rlimit_info(st);
1718
1719 os::Posix::print_load_average(st);
1720 }
1721
1722 void os::Solaris::print_distro_info(outputStream* st) {
1723 if (!_print_ascii_file("/etc/release", st)) {
1724 st->print("Solaris");
1725 }
1726 st->cr();
1727 }
1728
1729 void os::get_summary_os_info(char* buf, size_t buflen) {
1730 strncpy(buf, "Solaris", buflen); // default to plain solaris
1731 FILE* fp = fopen("/etc/release", "r");
1732 if (fp != NULL) {
1733 char tmp[256];
1734 // Only get the first line and chop out everything but the os name.
1735 if (fgets(tmp, sizeof(tmp), fp)) {
1736 char* ptr = tmp;
1737 // skip past whitespace characters
1738 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1739 if (*ptr != '\0') {
1740 char* nl = strchr(ptr, '\n');
1741 if (nl != NULL) *nl = '\0';
1742 strncpy(buf, ptr, buflen);
1743 }
1744 }
1745 fclose(fp);
1746 }
1747 }
1748
1749 void os::Solaris::print_libversion_info(outputStream* st) {
1750 st->print(" (T2 libthread)");
1751 st->cr();
1752 }
1753
1754 static bool check_addr0(outputStream* st) {
1755 jboolean status = false;
1756 const int read_chunk = 200;
1757 int ret = 0;
1758 int nmap = 0;
1759 int fd = ::open("/proc/self/map",O_RDONLY);
1760 if (fd >= 0) {
1761 prmap_t *p = NULL;
1762 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1763 if (NULL == mbuff) {
1764 ::close(fd);
1765 return status;
1766 }
1767 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1768 //check if read() has not read partial data
1769 if( 0 != ret % sizeof(prmap_t)){
1770 break;
1771 }
1772 nmap = ret / sizeof(prmap_t);
1773 p = (prmap_t *)mbuff;
1774 for(int i = 0; i < nmap; i++){
1775 if (p->pr_vaddr == 0x0) {
1776 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1777 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1778 st->print("Access: ");
1779 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1780 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1781 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1782 st->cr();
1783 status = true;
1784 }
1785 p++;
1786 }
1787 }
1788 free(mbuff);
1789 ::close(fd);
1790 }
1791 return status;
1792 }
1793
1794 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1795 // Get MHz with system call. We don't seem to already have this.
1796 processor_info_t stats;
1797 processorid_t id = getcpuid();
1798 int clock = 0;
1799 if (processor_info(id, &stats) != -1) {
1800 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1801 }
1802 #ifdef AMD64
1803 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1804 #else
1805 // must be sparc
1806 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1807 #endif
1808 }
1809
1810 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1811 // Nothing to do for now.
1812 }
1813
1814 void os::print_memory_info(outputStream* st) {
1815 st->print("Memory:");
1816 st->print(" %dk page", os::vm_page_size()>>10);
1817 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1818 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1819 st->cr();
1820 (void) check_addr0(st);
1821 }
1822
1823 // Moved from whole group, because we need them here for diagnostic
1824 // prints.
1825 static int Maxsignum = 0;
1826 static int *ourSigFlags = NULL;
1827
1828 int os::Solaris::get_our_sigflags(int sig) {
1829 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1830 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1831 return ourSigFlags[sig];
1832 }
1833
1834 void os::Solaris::set_our_sigflags(int sig, int flags) {
1835 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1836 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1837 ourSigFlags[sig] = flags;
1838 }
1839
1840
1841 static const char* get_signal_handler_name(address handler,
1842 char* buf, int buflen) {
1843 int offset;
1844 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1845 if (found) {
1846 // skip directory names
1847 const char *p1, *p2;
1848 p1 = buf;
1849 size_t len = strlen(os::file_separator());
1850 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1851 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1852 } else {
1853 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1854 }
1855 return buf;
1856 }
1857
1858 static void print_signal_handler(outputStream* st, int sig,
1859 char* buf, size_t buflen) {
1860 struct sigaction sa;
1861
1862 sigaction(sig, NULL, &sa);
1863
1864 st->print("%s: ", os::exception_name(sig, buf, buflen));
1865
1866 address handler = (sa.sa_flags & SA_SIGINFO)
1867 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1868 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1869
1870 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1871 st->print("SIG_DFL");
1872 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1873 st->print("SIG_IGN");
1874 } else {
1875 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1876 }
1877
1878 st->print(", sa_mask[0]=");
1879 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1880
1881 address rh = VMError::get_resetted_sighandler(sig);
1882 // May be, handler was resetted by VMError?
1883 if (rh != NULL) {
1884 handler = rh;
1885 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1886 }
1887
1888 st->print(", sa_flags=");
1889 os::Posix::print_sa_flags(st, sa.sa_flags);
1890
1891 // Check: is it our handler?
1892 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1893 // It is our signal handler
1894 // check for flags
1895 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1896 st->print(
1897 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1898 os::Solaris::get_our_sigflags(sig));
1899 }
1900 }
1901 st->cr();
1902 }
1903
1904 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1905 st->print_cr("Signal Handlers:");
1906 print_signal_handler(st, SIGSEGV, buf, buflen);
1907 print_signal_handler(st, SIGBUS , buf, buflen);
1908 print_signal_handler(st, SIGFPE , buf, buflen);
1909 print_signal_handler(st, SIGPIPE, buf, buflen);
1910 print_signal_handler(st, SIGXFSZ, buf, buflen);
1911 print_signal_handler(st, SIGILL , buf, buflen);
1912 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1913 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1914 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1915 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1916 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1917 }
1918
1919 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1920
1921 // Find the full path to the current module, libjvm.so
1922 void os::jvm_path(char *buf, jint buflen) {
1923 // Error checking.
1924 if (buflen < MAXPATHLEN) {
1925 assert(false, "must use a large-enough buffer");
1926 buf[0] = '\0';
1927 return;
1928 }
1929 // Lazy resolve the path to current module.
1930 if (saved_jvm_path[0] != 0) {
1931 strcpy(buf, saved_jvm_path);
1932 return;
1933 }
1934
1935 Dl_info dlinfo;
1936 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1937 assert(ret != 0, "cannot locate libjvm");
1938 if (ret != 0 && dlinfo.dli_fname != NULL) {
1939 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1940 return;
1941 }
1942 } else {
1943 buf[0] = '\0';
1944 return;
1945 }
1946
1947 if (Arguments::sun_java_launcher_is_altjvm()) {
1948 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1949 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1950 // If "/jre/lib/" appears at the right place in the string, then
1951 // assume we are installed in a JDK and we're done. Otherwise, check
1952 // for a JAVA_HOME environment variable and fix up the path so it
1953 // looks like libjvm.so is installed there (append a fake suffix
1954 // hotspot/libjvm.so).
1955 const char *p = buf + strlen(buf) - 1;
1956 for (int count = 0; p > buf && count < 5; ++count) {
1957 for (--p; p > buf && *p != '/'; --p)
1958 /* empty */ ;
1959 }
1960
1961 if (strncmp(p, "/jre/lib/", 9) != 0) {
1962 // Look for JAVA_HOME in the environment.
1963 char* java_home_var = ::getenv("JAVA_HOME");
1964 if (java_home_var != NULL && java_home_var[0] != 0) {
1965 char* jrelib_p;
1966 int len;
1967
1968 // Check the current module name "libjvm.so".
1969 p = strrchr(buf, '/');
1970 assert(strstr(p, "/libjvm") == p, "invalid library name");
1971
1972 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
1973 return;
1974 }
1975 // determine if this is a legacy image or modules image
1976 // modules image doesn't have "jre" subdirectory
1977 len = strlen(buf);
1978 assert(len < buflen, "Ran out of buffer space");
1979 jrelib_p = buf + len;
1980 snprintf(jrelib_p, buflen-len, "/jre/lib");
1981 if (0 != access(buf, F_OK)) {
1982 snprintf(jrelib_p, buflen-len, "/lib");
1983 }
1984
1985 if (0 == access(buf, F_OK)) {
1986 // Use current module name "libjvm.so"
1987 len = strlen(buf);
1988 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1989 } else {
1990 // Go back to path of .so
1991 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1992 return;
1993 }
1994 }
1995 }
1996 }
1997 }
1998
1999 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2000 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2001 }
2002
2003
2004 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2005 // no prefix required, not even "_"
2006 }
2007
2008
2009 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2010 // no suffix required
2011 }
2012
2013 // This method is a copy of JDK's sysGetLastErrorString
2014 // from src/solaris/hpi/src/system_md.c
2015
2016 size_t os::lasterror(char *buf, size_t len) {
2017 if (errno == 0) return 0;
2018
2019 const char *s = os::strerror(errno);
2020 size_t n = ::strlen(s);
2021 if (n >= len) {
2022 n = len - 1;
2023 }
2024 ::strncpy(buf, s, n);
2025 buf[n] = '\0';
2026 return n;
2027 }
2028
2029
2030 // sun.misc.Signal
2031
2032 extern "C" {
2033 static void UserHandler(int sig, void *siginfo, void *context) {
2034 // Ctrl-C is pressed during error reporting, likely because the error
2035 // handler fails to abort. Let VM die immediately.
2036 if (sig == SIGINT && VMError::is_error_reported()) {
2037 os::die();
2038 }
2039
2040 os::signal_notify(sig);
2041 // We do not need to reinstate the signal handler each time...
2042 }
2043 }
2044
2045 void* os::user_handler() {
2046 return CAST_FROM_FN_PTR(void*, UserHandler);
2047 }
2048
2049 static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) {
2050 struct timespec ts;
2051 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2052
2053 return ts;
2054 }
2055
2056 extern "C" {
2057 typedef void (*sa_handler_t)(int);
2058 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2059 }
2060
2061 void* os::signal(int signal_number, void* handler) {
2062 struct sigaction sigAct, oldSigAct;
2063 sigfillset(&(sigAct.sa_mask));
2064 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2065 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2066
2067 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2068 // -1 means registration failed
2069 return (void *)-1;
2070 }
2071
2072 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2073 }
2074
2075 void os::signal_raise(int signal_number) {
2076 raise(signal_number);
2077 }
2078
2079 // The following code is moved from os.cpp for making this
2080 // code platform specific, which it is by its very nature.
2081
2082 // a counter for each possible signal value
2083 static int Sigexit = 0;
2084 static jint *pending_signals = NULL;
2085 static int *preinstalled_sigs = NULL;
2086 static struct sigaction *chainedsigactions = NULL;
2087 static Semaphore* sig_sem = NULL;
2088
2089 int os::sigexitnum_pd() {
2090 assert(Sigexit > 0, "signal memory not yet initialized");
2091 return Sigexit;
2092 }
2093
2094 void os::Solaris::init_signal_mem() {
2095 // Initialize signal structures
2096 Maxsignum = SIGRTMAX;
2097 Sigexit = Maxsignum+1;
2098 assert(Maxsignum >0, "Unable to obtain max signal number");
2099
2100 // Initialize signal structures
2101 // pending_signals has one int per signal
2102 // The additional signal is for SIGEXIT - exit signal to signal_thread
2103 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2104 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2105
2106 if (UseSignalChaining) {
2107 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2108 * (Maxsignum + 1), mtInternal);
2109 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2110 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2111 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2112 }
2113 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2114 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2115 }
2116
2117 static void jdk_misc_signal_init() {
2118 // Initialize signal semaphore
2119 sig_sem = new Semaphore();
2120 }
2121
2122 void os::signal_notify(int sig) {
2123 if (sig_sem != NULL) {
2124 Atomic::inc(&pending_signals[sig]);
2125 sig_sem->signal();
2126 } else {
2127 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2128 // initialization isn't called.
2129 assert(ReduceSignalUsage, "signal semaphore should be created");
2130 }
2131 }
2132
2133 static int check_pending_signals() {
2134 int ret;
2135 while (true) {
2136 for (int i = 0; i < Sigexit + 1; i++) {
2137 jint n = pending_signals[i];
2138 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2139 return i;
2140 }
2141 }
2142 JavaThread *thread = JavaThread::current();
2143 ThreadBlockInVM tbivm(thread);
2144
2145 bool threadIsSuspended;
2146 do {
2147 thread->set_suspend_equivalent();
2148 sig_sem->wait();
2149
2150 // were we externally suspended while we were waiting?
2151 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2152 if (threadIsSuspended) {
2153 // The semaphore has been incremented, but while we were waiting
2154 // another thread suspended us. We don't want to continue running
2155 // while suspended because that would surprise the thread that
2156 // suspended us.
2157 sig_sem->signal();
2158
2159 thread->java_suspend_self();
2160 }
2161 } while (threadIsSuspended);
2162 }
2163 }
2164
2165 int os::signal_wait() {
2166 return check_pending_signals();
2167 }
2168
2169 ////////////////////////////////////////////////////////////////////////////////
2170 // Virtual Memory
2171
2172 static int page_size = -1;
2173
2174 int os::vm_page_size() {
2175 assert(page_size != -1, "must call os::init");
2176 return page_size;
2177 }
2178
2179 // Solaris allocates memory by pages.
2180 int os::vm_allocation_granularity() {
2181 assert(page_size != -1, "must call os::init");
2182 return page_size;
2183 }
2184
2185 static bool recoverable_mmap_error(int err) {
2186 // See if the error is one we can let the caller handle. This
2187 // list of errno values comes from the Solaris mmap(2) man page.
2188 switch (err) {
2189 case EBADF:
2190 case EINVAL:
2191 case ENOTSUP:
2192 // let the caller deal with these errors
2193 return true;
2194
2195 default:
2196 // Any remaining errors on this OS can cause our reserved mapping
2197 // to be lost. That can cause confusion where different data
2198 // structures think they have the same memory mapped. The worst
2199 // scenario is if both the VM and a library think they have the
2200 // same memory mapped.
2201 return false;
2202 }
2203 }
2204
2205 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2206 int err) {
2207 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2208 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2209 os::strerror(err), err);
2210 }
2211
2212 static void warn_fail_commit_memory(char* addr, size_t bytes,
2213 size_t alignment_hint, bool exec,
2214 int err) {
2215 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2216 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2217 alignment_hint, exec, os::strerror(err), err);
2218 }
2219
2220 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2221 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2222 size_t size = bytes;
2223 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2224 if (res != NULL) {
2225 if (UseNUMAInterleaving) {
2226 numa_make_global(addr, bytes);
2227 }
2228 return 0;
2229 }
2230
2231 int err = errno; // save errno from mmap() call in mmap_chunk()
2232
2233 if (!recoverable_mmap_error(err)) {
2234 warn_fail_commit_memory(addr, bytes, exec, err);
2235 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2236 }
2237
2238 return err;
2239 }
2240
2241 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2242 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2243 }
2244
2245 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2246 const char* mesg) {
2247 assert(mesg != NULL, "mesg must be specified");
2248 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2249 if (err != 0) {
2250 // the caller wants all commit errors to exit with the specified mesg:
2251 warn_fail_commit_memory(addr, bytes, exec, err);
2252 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2253 }
2254 }
2255
2256 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2257 assert(is_aligned(alignment, (size_t) vm_page_size()),
2258 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2259 alignment, (size_t) vm_page_size());
2260
2261 for (int i = 0; _page_sizes[i] != 0; i++) {
2262 if (is_aligned(alignment, _page_sizes[i])) {
2263 return _page_sizes[i];
2264 }
2265 }
2266
2267 return (size_t) vm_page_size();
2268 }
2269
2270 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2271 size_t alignment_hint, bool exec) {
2272 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2273 if (err == 0 && UseLargePages && alignment_hint > 0) {
2274 assert(is_aligned(bytes, alignment_hint),
2275 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2276
2277 // The syscall memcntl requires an exact page size (see man memcntl for details).
2278 size_t page_size = page_size_for_alignment(alignment_hint);
2279 if (page_size > (size_t) vm_page_size()) {
2280 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2281 }
2282 }
2283 return err;
2284 }
2285
2286 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2287 bool exec) {
2288 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2289 }
2290
2291 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2292 size_t alignment_hint, bool exec,
2293 const char* mesg) {
2294 assert(mesg != NULL, "mesg must be specified");
2295 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2296 if (err != 0) {
2297 // the caller wants all commit errors to exit with the specified mesg:
2298 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2299 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2300 }
2301 }
2302
2303 // Uncommit the pages in a specified region.
2304 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2305 if (madvise(addr, bytes, MADV_FREE) < 0) {
2306 debug_only(warning("MADV_FREE failed."));
2307 return;
2308 }
2309 }
2310
2311 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2312 return os::commit_memory(addr, size, !ExecMem);
2313 }
2314
2315 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2316 return os::uncommit_memory(addr, size);
2317 }
2318
2319 // Change the page size in a given range.
2320 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2321 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2322 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2323 if (UseLargePages) {
2324 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2325 if (page_size > (size_t) vm_page_size()) {
2326 Solaris::setup_large_pages(addr, bytes, page_size);
2327 }
2328 }
2329 }
2330
2331 // Tell the OS to make the range local to the first-touching LWP
2332 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2333 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2334 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2335 debug_only(warning("MADV_ACCESS_LWP failed."));
2336 }
2337 }
2338
2339 // Tell the OS that this range would be accessed from different LWPs.
2340 void os::numa_make_global(char *addr, size_t bytes) {
2341 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2342 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2343 debug_only(warning("MADV_ACCESS_MANY failed."));
2344 }
2345 }
2346
2347 // Get the number of the locality groups.
2348 size_t os::numa_get_groups_num() {
2349 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2350 return n != -1 ? n : 1;
2351 }
2352
2353 // Get a list of leaf locality groups. A leaf lgroup is group that
2354 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2355 // board. An LWP is assigned to one of these groups upon creation.
2356 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2357 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2358 ids[0] = 0;
2359 return 1;
2360 }
2361 int result_size = 0, top = 1, bottom = 0, cur = 0;
2362 for (int k = 0; k < size; k++) {
2363 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2364 (Solaris::lgrp_id_t*)&ids[top], size - top);
2365 if (r == -1) {
2366 ids[0] = 0;
2367 return 1;
2368 }
2369 if (!r) {
2370 // That's a leaf node.
2371 assert(bottom <= cur, "Sanity check");
2372 // Check if the node has memory
2373 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2374 NULL, 0, LGRP_RSRC_MEM) > 0) {
2375 ids[bottom++] = ids[cur];
2376 }
2377 }
2378 top += r;
2379 cur++;
2380 }
2381 if (bottom == 0) {
2382 // Handle a situation, when the OS reports no memory available.
2383 // Assume UMA architecture.
2384 ids[0] = 0;
2385 return 1;
2386 }
2387 return bottom;
2388 }
2389
2390 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2391 bool os::numa_topology_changed() {
2392 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2393 if (is_stale != -1 && is_stale) {
2394 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2395 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2396 assert(c != 0, "Failure to initialize LGRP API");
2397 Solaris::set_lgrp_cookie(c);
2398 return true;
2399 }
2400 return false;
2401 }
2402
2403 // Get the group id of the current LWP.
2404 int os::numa_get_group_id() {
2405 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2406 if (lgrp_id == -1) {
2407 return 0;
2408 }
2409 const int size = os::numa_get_groups_num();
2410 int *ids = (int*)alloca(size * sizeof(int));
2411
2412 // Get the ids of all lgroups with memory; r is the count.
2413 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2414 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2415 if (r <= 0) {
2416 return 0;
2417 }
2418 return ids[os::random() % r];
2419 }
2420
2421 // Request information about the page.
2422 bool os::get_page_info(char *start, page_info* info) {
2423 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2424 uint64_t addr = (uintptr_t)start;
2425 uint64_t outdata[2];
2426 uint_t validity = 0;
2427
2428 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2429 return false;
2430 }
2431
2432 info->size = 0;
2433 info->lgrp_id = -1;
2434
2435 if ((validity & 1) != 0) {
2436 if ((validity & 2) != 0) {
2437 info->lgrp_id = outdata[0];
2438 }
2439 if ((validity & 4) != 0) {
2440 info->size = outdata[1];
2441 }
2442 return true;
2443 }
2444 return false;
2445 }
2446
2447 // Scan the pages from start to end until a page different than
2448 // the one described in the info parameter is encountered.
2449 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2450 page_info* page_found) {
2451 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2452 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2453 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2454 uint_t validity[MAX_MEMINFO_CNT];
2455
2456 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2457 uint64_t p = (uint64_t)start;
2458 while (p < (uint64_t)end) {
2459 addrs[0] = p;
2460 size_t addrs_count = 1;
2461 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2462 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2463 addrs_count++;
2464 }
2465
2466 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2467 return NULL;
2468 }
2469
2470 size_t i = 0;
2471 for (; i < addrs_count; i++) {
2472 if ((validity[i] & 1) != 0) {
2473 if ((validity[i] & 4) != 0) {
2474 if (outdata[types * i + 1] != page_expected->size) {
2475 break;
2476 }
2477 } else if (page_expected->size != 0) {
2478 break;
2479 }
2480
2481 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2482 if (outdata[types * i] != page_expected->lgrp_id) {
2483 break;
2484 }
2485 }
2486 } else {
2487 return NULL;
2488 }
2489 }
2490
2491 if (i < addrs_count) {
2492 if ((validity[i] & 2) != 0) {
2493 page_found->lgrp_id = outdata[types * i];
2494 } else {
2495 page_found->lgrp_id = -1;
2496 }
2497 if ((validity[i] & 4) != 0) {
2498 page_found->size = outdata[types * i + 1];
2499 } else {
2500 page_found->size = 0;
2501 }
2502 return (char*)addrs[i];
2503 }
2504
2505 p = addrs[addrs_count - 1] + page_size;
2506 }
2507 return end;
2508 }
2509
2510 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2511 size_t size = bytes;
2512 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2513 // uncommitted page. Otherwise, the read/write might succeed if we
2514 // have enough swap space to back the physical page.
2515 return
2516 NULL != Solaris::mmap_chunk(addr, size,
2517 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2518 PROT_NONE);
2519 }
2520
2521 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2522 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2523
2524 if (b == MAP_FAILED) {
2525 return NULL;
2526 }
2527 return b;
2528 }
2529
2530 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2531 size_t alignment_hint, bool fixed) {
2532 char* addr = requested_addr;
2533 int flags = MAP_PRIVATE | MAP_NORESERVE;
2534
2535 assert(!(fixed && (alignment_hint > 0)),
2536 "alignment hint meaningless with fixed mmap");
2537
2538 if (fixed) {
2539 flags |= MAP_FIXED;
2540 } else if (alignment_hint > (size_t) vm_page_size()) {
2541 flags |= MAP_ALIGN;
2542 addr = (char*) alignment_hint;
2543 }
2544
2545 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2546 // uncommitted page. Otherwise, the read/write might succeed if we
2547 // have enough swap space to back the physical page.
2548 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2549 }
2550
2551 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2552 size_t alignment_hint) {
2553 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2554 (requested_addr != NULL));
2555
2556 guarantee(requested_addr == NULL || requested_addr == addr,
2557 "OS failed to return requested mmap address.");
2558 return addr;
2559 }
2560
2561 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2562 assert(file_desc >= 0, "file_desc is not valid");
2563 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2564 if (result != NULL) {
2565 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2566 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2567 }
2568 }
2569 return result;
2570 }
2571
2572 // Reserve memory at an arbitrary address, only if that area is
2573 // available (and not reserved for something else).
2574
2575 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2576 const int max_tries = 10;
2577 char* base[max_tries];
2578 size_t size[max_tries];
2579
2580 // Solaris adds a gap between mmap'ed regions. The size of the gap
2581 // is dependent on the requested size and the MMU. Our initial gap
2582 // value here is just a guess and will be corrected later.
2583 bool had_top_overlap = false;
2584 bool have_adjusted_gap = false;
2585 size_t gap = 0x400000;
2586
2587 // Assert only that the size is a multiple of the page size, since
2588 // that's all that mmap requires, and since that's all we really know
2589 // about at this low abstraction level. If we need higher alignment,
2590 // we can either pass an alignment to this method or verify alignment
2591 // in one of the methods further up the call chain. See bug 5044738.
2592 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2593
2594 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2595 // Give it a try, if the kernel honors the hint we can return immediately.
2596 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2597
2598 volatile int err = errno;
2599 if (addr == requested_addr) {
2600 return addr;
2601 } else if (addr != NULL) {
2602 pd_unmap_memory(addr, bytes);
2603 }
2604
2605 if (log_is_enabled(Warning, os)) {
2606 char buf[256];
2607 buf[0] = '\0';
2608 if (addr == NULL) {
2609 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2610 }
2611 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2612 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2613 "%s", bytes, requested_addr, addr, buf);
2614 }
2615
2616 // Address hint method didn't work. Fall back to the old method.
2617 // In theory, once SNV becomes our oldest supported platform, this
2618 // code will no longer be needed.
2619 //
2620 // Repeatedly allocate blocks until the block is allocated at the
2621 // right spot. Give up after max_tries.
2622 int i;
2623 for (i = 0; i < max_tries; ++i) {
2624 base[i] = reserve_memory(bytes);
2625
2626 if (base[i] != NULL) {
2627 // Is this the block we wanted?
2628 if (base[i] == requested_addr) {
2629 size[i] = bytes;
2630 break;
2631 }
2632
2633 // check that the gap value is right
2634 if (had_top_overlap && !have_adjusted_gap) {
2635 size_t actual_gap = base[i-1] - base[i] - bytes;
2636 if (gap != actual_gap) {
2637 // adjust the gap value and retry the last 2 allocations
2638 assert(i > 0, "gap adjustment code problem");
2639 have_adjusted_gap = true; // adjust the gap only once, just in case
2640 gap = actual_gap;
2641 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2642 unmap_memory(base[i], bytes);
2643 unmap_memory(base[i-1], size[i-1]);
2644 i-=2;
2645 continue;
2646 }
2647 }
2648
2649 // Does this overlap the block we wanted? Give back the overlapped
2650 // parts and try again.
2651 //
2652 // There is still a bug in this code: if top_overlap == bytes,
2653 // the overlap is offset from requested region by the value of gap.
2654 // In this case giving back the overlapped part will not work,
2655 // because we'll give back the entire block at base[i] and
2656 // therefore the subsequent allocation will not generate a new gap.
2657 // This could be fixed with a new algorithm that used larger
2658 // or variable size chunks to find the requested region -
2659 // but such a change would introduce additional complications.
2660 // It's rare enough that the planets align for this bug,
2661 // so we'll just wait for a fix for 6204603/5003415 which
2662 // will provide a mmap flag to allow us to avoid this business.
2663
2664 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2665 if (top_overlap >= 0 && top_overlap < bytes) {
2666 had_top_overlap = true;
2667 unmap_memory(base[i], top_overlap);
2668 base[i] += top_overlap;
2669 size[i] = bytes - top_overlap;
2670 } else {
2671 size_t bottom_overlap = base[i] + bytes - requested_addr;
2672 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2673 if (bottom_overlap == 0) {
2674 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2675 }
2676 unmap_memory(requested_addr, bottom_overlap);
2677 size[i] = bytes - bottom_overlap;
2678 } else {
2679 size[i] = bytes;
2680 }
2681 }
2682 }
2683 }
2684
2685 // Give back the unused reserved pieces.
2686
2687 for (int j = 0; j < i; ++j) {
2688 if (base[j] != NULL) {
2689 unmap_memory(base[j], size[j]);
2690 }
2691 }
2692
2693 return (i < max_tries) ? requested_addr : NULL;
2694 }
2695
2696 bool os::pd_release_memory(char* addr, size_t bytes) {
2697 size_t size = bytes;
2698 return munmap(addr, size) == 0;
2699 }
2700
2701 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2702 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2703 "addr must be page aligned");
2704 int retVal = mprotect(addr, bytes, prot);
2705 return retVal == 0;
2706 }
2707
2708 // Protect memory (Used to pass readonly pages through
2709 // JNI GetArray<type>Elements with empty arrays.)
2710 // Also, used for serialization page and for compressed oops null pointer
2711 // checking.
2712 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2713 bool is_committed) {
2714 unsigned int p = 0;
2715 switch (prot) {
2716 case MEM_PROT_NONE: p = PROT_NONE; break;
2717 case MEM_PROT_READ: p = PROT_READ; break;
2718 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2719 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2720 default:
2721 ShouldNotReachHere();
2722 }
2723 // is_committed is unused.
2724 return solaris_mprotect(addr, bytes, p);
2725 }
2726
2727 // guard_memory and unguard_memory only happens within stack guard pages.
2728 // Since ISM pertains only to the heap, guard and unguard memory should not
2729 /// happen with an ISM region.
2730 bool os::guard_memory(char* addr, size_t bytes) {
2731 return solaris_mprotect(addr, bytes, PROT_NONE);
2732 }
2733
2734 bool os::unguard_memory(char* addr, size_t bytes) {
2735 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2736 }
2737
2738 // Large page support
2739 static size_t _large_page_size = 0;
2740
2741 // Insertion sort for small arrays (descending order).
2742 static void insertion_sort_descending(size_t* array, int len) {
2743 for (int i = 0; i < len; i++) {
2744 size_t val = array[i];
2745 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2746 size_t tmp = array[key];
2747 array[key] = array[key - 1];
2748 array[key - 1] = tmp;
2749 }
2750 }
2751 }
2752
2753 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2754 const unsigned int usable_count = VM_Version::page_size_count();
2755 if (usable_count == 1) {
2756 return false;
2757 }
2758
2759 // Find the right getpagesizes interface. When solaris 11 is the minimum
2760 // build platform, getpagesizes() (without the '2') can be called directly.
2761 typedef int (*gps_t)(size_t[], int);
2762 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2763 if (gps_func == NULL) {
2764 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2765 if (gps_func == NULL) {
2766 if (warn) {
2767 warning("MPSS is not supported by the operating system.");
2768 }
2769 return false;
2770 }
2771 }
2772
2773 // Fill the array of page sizes.
2774 int n = (*gps_func)(_page_sizes, page_sizes_max);
2775 assert(n > 0, "Solaris bug?");
2776
2777 if (n == page_sizes_max) {
2778 // Add a sentinel value (necessary only if the array was completely filled
2779 // since it is static (zeroed at initialization)).
2780 _page_sizes[--n] = 0;
2781 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2782 }
2783 assert(_page_sizes[n] == 0, "missing sentinel");
2784 trace_page_sizes("available page sizes", _page_sizes, n);
2785
2786 if (n == 1) return false; // Only one page size available.
2787
2788 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2789 // select up to usable_count elements. First sort the array, find the first
2790 // acceptable value, then copy the usable sizes to the top of the array and
2791 // trim the rest. Make sure to include the default page size :-).
2792 //
2793 // A better policy could get rid of the 4M limit by taking the sizes of the
2794 // important VM memory regions (java heap and possibly the code cache) into
2795 // account.
2796 insertion_sort_descending(_page_sizes, n);
2797 const size_t size_limit =
2798 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2799 int beg;
2800 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2801 const int end = MIN2((int)usable_count, n) - 1;
2802 for (int cur = 0; cur < end; ++cur, ++beg) {
2803 _page_sizes[cur] = _page_sizes[beg];
2804 }
2805 _page_sizes[end] = vm_page_size();
2806 _page_sizes[end + 1] = 0;
2807
2808 if (_page_sizes[end] > _page_sizes[end - 1]) {
2809 // Default page size is not the smallest; sort again.
2810 insertion_sort_descending(_page_sizes, end + 1);
2811 }
2812 *page_size = _page_sizes[0];
2813
2814 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2815 return true;
2816 }
2817
2818 void os::large_page_init() {
2819 if (UseLargePages) {
2820 // print a warning if any large page related flag is specified on command line
2821 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2822 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2823
2824 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2825 }
2826 }
2827
2828 bool os::Solaris::is_valid_page_size(size_t bytes) {
2829 for (int i = 0; _page_sizes[i] != 0; i++) {
2830 if (_page_sizes[i] == bytes) {
2831 return true;
2832 }
2833 }
2834 return false;
2835 }
2836
2837 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2838 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2839 assert(is_aligned((void*) start, align),
2840 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2841 assert(is_aligned(bytes, align),
2842 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2843
2844 // Signal to OS that we want large pages for addresses
2845 // from addr, addr + bytes
2846 struct memcntl_mha mpss_struct;
2847 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2848 mpss_struct.mha_pagesize = align;
2849 mpss_struct.mha_flags = 0;
2850 // Upon successful completion, memcntl() returns 0
2851 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2852 debug_only(warning("Attempt to use MPSS failed."));
2853 return false;
2854 }
2855 return true;
2856 }
2857
2858 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2859 fatal("os::reserve_memory_special should not be called on Solaris.");
2860 return NULL;
2861 }
2862
2863 bool os::release_memory_special(char* base, size_t bytes) {
2864 fatal("os::release_memory_special should not be called on Solaris.");
2865 return false;
2866 }
2867
2868 size_t os::large_page_size() {
2869 return _large_page_size;
2870 }
2871
2872 // MPSS allows application to commit large page memory on demand; with ISM
2873 // the entire memory region must be allocated as shared memory.
2874 bool os::can_commit_large_page_memory() {
2875 return true;
2876 }
2877
2878 bool os::can_execute_large_page_memory() {
2879 return true;
2880 }
2881
2882 // Read calls from inside the vm need to perform state transitions
2883 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2884 size_t res;
2885 JavaThread* thread = (JavaThread*)Thread::current();
2886 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2887 ThreadBlockInVM tbiv(thread);
2888 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2889 return res;
2890 }
2891
2892 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2893 size_t res;
2894 JavaThread* thread = (JavaThread*)Thread::current();
2895 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2896 ThreadBlockInVM tbiv(thread);
2897 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
2898 return res;
2899 }
2900
2901 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
2902 size_t res;
2903 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
2904 "Assumed _thread_in_native");
2905 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2906 return res;
2907 }
2908
2909 void os::naked_short_sleep(jlong ms) {
2910 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2911
2912 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
2913 // Solaris requires -lrt for this.
2914 usleep((ms * 1000));
2915
2916 return;
2917 }
2918
2919 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2920 void os::infinite_sleep() {
2921 while (true) { // sleep forever ...
2922 ::sleep(100); // ... 100 seconds at a time
2923 }
2924 }
2925
2926 // Used to convert frequent JVM_Yield() to nops
2927 bool os::dont_yield() {
2928 if (DontYieldALot) {
2929 static hrtime_t last_time = 0;
2930 hrtime_t diff = getTimeNanos() - last_time;
2931
2932 if (diff < DontYieldALotInterval * 1000000) {
2933 return true;
2934 }
2935
2936 last_time += diff;
2937
2938 return false;
2939 } else {
2940 return false;
2941 }
2942 }
2943
2944 // Note that yield semantics are defined by the scheduling class to which
2945 // the thread currently belongs. Typically, yield will _not yield to
2946 // other equal or higher priority threads that reside on the dispatch queues
2947 // of other CPUs.
2948
2949 void os::naked_yield() {
2950 thr_yield();
2951 }
2952
2953 // Interface for setting lwp priorities. We are using T2 libthread,
2954 // which forces the use of bound threads, so all of our threads will
2955 // be assigned to real lwp's. Using the thr_setprio function is
2956 // meaningless in this mode so we must adjust the real lwp's priority.
2957 // The routines below implement the getting and setting of lwp priorities.
2958 //
2959 // Note: There are three priority scales used on Solaris. Java priotities
2960 // which range from 1 to 10, libthread "thr_setprio" scale which range
2961 // from 0 to 127, and the current scheduling class of the process we
2962 // are running in. This is typically from -60 to +60.
2963 // The setting of the lwp priorities in done after a call to thr_setprio
2964 // so Java priorities are mapped to libthread priorities and we map from
2965 // the latter to lwp priorities. We don't keep priorities stored in
2966 // Java priorities since some of our worker threads want to set priorities
2967 // higher than all Java threads.
2968 //
2969 // For related information:
2970 // (1) man -s 2 priocntl
2971 // (2) man -s 4 priocntl
2972 // (3) man dispadmin
2973 // = librt.so
2974 // = libthread/common/rtsched.c - thrp_setlwpprio().
2975 // = ps -cL <pid> ... to validate priority.
2976 // = sched_get_priority_min and _max
2977 // pthread_create
2978 // sched_setparam
2979 // pthread_setschedparam
2980 //
2981 // Assumptions:
2982 // + We assume that all threads in the process belong to the same
2983 // scheduling class. IE. an homogenous process.
2984 // + Must be root or in IA group to change change "interactive" attribute.
2985 // Priocntl() will fail silently. The only indication of failure is when
2986 // we read-back the value and notice that it hasn't changed.
2987 // + Interactive threads enter the runq at the head, non-interactive at the tail.
2988 // + For RT, change timeslice as well. Invariant:
2989 // constant "priority integral"
2990 // Konst == TimeSlice * (60-Priority)
2991 // Given a priority, compute appropriate timeslice.
2992 // + Higher numerical values have higher priority.
2993
2994 // sched class attributes
2995 typedef struct {
2996 int schedPolicy; // classID
2997 int maxPrio;
2998 int minPrio;
2999 } SchedInfo;
3000
3001
3002 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3003
3004 #ifdef ASSERT
3005 static int ReadBackValidate = 1;
3006 #endif
3007 static int myClass = 0;
3008 static int myMin = 0;
3009 static int myMax = 0;
3010 static int myCur = 0;
3011 static bool priocntl_enable = false;
3012
3013 static const int criticalPrio = FXCriticalPriority;
3014 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3015
3016
3017 // lwp_priocntl_init
3018 //
3019 // Try to determine the priority scale for our process.
3020 //
3021 // Return errno or 0 if OK.
3022 //
3023 static int lwp_priocntl_init() {
3024 int rslt;
3025 pcinfo_t ClassInfo;
3026 pcparms_t ParmInfo;
3027 int i;
3028
3029 if (!UseThreadPriorities) return 0;
3030
3031 // If ThreadPriorityPolicy is 1, switch tables
3032 if (ThreadPriorityPolicy == 1) {
3033 for (i = 0; i < CriticalPriority+1; i++)
3034 os::java_to_os_priority[i] = prio_policy1[i];
3035 }
3036 if (UseCriticalJavaThreadPriority) {
3037 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3038 // See set_native_priority() and set_lwp_class_and_priority().
3039 // Save original MaxPriority mapping in case attempt to
3040 // use critical priority fails.
3041 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3042 // Set negative to distinguish from other priorities
3043 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3044 }
3045
3046 // Get IDs for a set of well-known scheduling classes.
3047 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3048 // the system. We should have a loop that iterates over the
3049 // classID values, which are known to be "small" integers.
3050
3051 strcpy(ClassInfo.pc_clname, "TS");
3052 ClassInfo.pc_cid = -1;
3053 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3054 if (rslt < 0) return errno;
3055 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3056 tsLimits.schedPolicy = ClassInfo.pc_cid;
3057 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3058 tsLimits.minPrio = -tsLimits.maxPrio;
3059
3060 strcpy(ClassInfo.pc_clname, "IA");
3061 ClassInfo.pc_cid = -1;
3062 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3063 if (rslt < 0) return errno;
3064 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3065 iaLimits.schedPolicy = ClassInfo.pc_cid;
3066 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3067 iaLimits.minPrio = -iaLimits.maxPrio;
3068
3069 strcpy(ClassInfo.pc_clname, "RT");
3070 ClassInfo.pc_cid = -1;
3071 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3072 if (rslt < 0) return errno;
3073 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3074 rtLimits.schedPolicy = ClassInfo.pc_cid;
3075 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3076 rtLimits.minPrio = 0;
3077
3078 strcpy(ClassInfo.pc_clname, "FX");
3079 ClassInfo.pc_cid = -1;
3080 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3081 if (rslt < 0) return errno;
3082 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3083 fxLimits.schedPolicy = ClassInfo.pc_cid;
3084 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3085 fxLimits.minPrio = 0;
3086
3087 // Query our "current" scheduling class.
3088 // This will normally be IA, TS or, rarely, FX or RT.
3089 memset(&ParmInfo, 0, sizeof(ParmInfo));
3090 ParmInfo.pc_cid = PC_CLNULL;
3091 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3092 if (rslt < 0) return errno;
3093 myClass = ParmInfo.pc_cid;
3094
3095 // We now know our scheduling classId, get specific information
3096 // about the class.
3097 ClassInfo.pc_cid = myClass;
3098 ClassInfo.pc_clname[0] = 0;
3099 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3100 if (rslt < 0) return errno;
3101
3102 if (ThreadPriorityVerbose) {
3103 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3104 }
3105
3106 memset(&ParmInfo, 0, sizeof(pcparms_t));
3107 ParmInfo.pc_cid = PC_CLNULL;
3108 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3109 if (rslt < 0) return errno;
3110
3111 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3112 myMin = rtLimits.minPrio;
3113 myMax = rtLimits.maxPrio;
3114 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3115 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3116 myMin = iaLimits.minPrio;
3117 myMax = iaLimits.maxPrio;
3118 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3119 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3120 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3121 myMin = tsLimits.minPrio;
3122 myMax = tsLimits.maxPrio;
3123 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3124 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3125 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3126 myMin = fxLimits.minPrio;
3127 myMax = fxLimits.maxPrio;
3128 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3129 } else {
3130 // No clue - punt
3131 if (ThreadPriorityVerbose) {
3132 tty->print_cr("Unknown scheduling class: %s ... \n",
3133 ClassInfo.pc_clname);
3134 }
3135 return EINVAL; // no clue, punt
3136 }
3137
3138 if (ThreadPriorityVerbose) {
3139 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3140 }
3141
3142 priocntl_enable = true; // Enable changing priorities
3143 return 0;
3144 }
3145
3146 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3147 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3148 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3149 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3150
3151
3152 // scale_to_lwp_priority
3153 //
3154 // Convert from the libthread "thr_setprio" scale to our current
3155 // lwp scheduling class scale.
3156 //
3157 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3158 int v;
3159
3160 if (x == 127) return rMax; // avoid round-down
3161 v = (((x*(rMax-rMin)))/128)+rMin;
3162 return v;
3163 }
3164
3165
3166 // set_lwp_class_and_priority
3167 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3168 int newPrio, int new_class, bool scale) {
3169 int rslt;
3170 int Actual, Expected, prv;
3171 pcparms_t ParmInfo; // for GET-SET
3172 #ifdef ASSERT
3173 pcparms_t ReadBack; // for readback
3174 #endif
3175
3176 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3177 // Query current values.
3178 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3179 // Cache "pcparms_t" in global ParmCache.
3180 // TODO: elide set-to-same-value
3181
3182 // If something went wrong on init, don't change priorities.
3183 if (!priocntl_enable) {
3184 if (ThreadPriorityVerbose) {
3185 tty->print_cr("Trying to set priority but init failed, ignoring");
3186 }
3187 return EINVAL;
3188 }
3189
3190 // If lwp hasn't started yet, just return
3191 // the _start routine will call us again.
3192 if (lwpid <= 0) {
3193 if (ThreadPriorityVerbose) {
3194 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3195 INTPTR_FORMAT " to %d, lwpid not set",
3196 ThreadID, newPrio);
3197 }
3198 return 0;
3199 }
3200
3201 if (ThreadPriorityVerbose) {
3202 tty->print_cr ("set_lwp_class_and_priority("
3203 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3204 ThreadID, lwpid, newPrio);
3205 }
3206
3207 memset(&ParmInfo, 0, sizeof(pcparms_t));
3208 ParmInfo.pc_cid = PC_CLNULL;
3209 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3210 if (rslt < 0) return errno;
3211
3212 int cur_class = ParmInfo.pc_cid;
3213 ParmInfo.pc_cid = (id_t)new_class;
3214
3215 if (new_class == rtLimits.schedPolicy) {
3216 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3217 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3218 rtLimits.maxPrio, newPrio)
3219 : newPrio;
3220 rtInfo->rt_tqsecs = RT_NOCHANGE;
3221 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3222 if (ThreadPriorityVerbose) {
3223 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3224 }
3225 } else if (new_class == iaLimits.schedPolicy) {
3226 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3227 int maxClamped = MIN2(iaLimits.maxPrio,
3228 cur_class == new_class
3229 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3230 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3231 maxClamped, newPrio)
3232 : newPrio;
3233 iaInfo->ia_uprilim = cur_class == new_class
3234 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3235 iaInfo->ia_mode = IA_NOCHANGE;
3236 if (ThreadPriorityVerbose) {
3237 tty->print_cr("IA: [%d...%d] %d->%d\n",
3238 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3239 }
3240 } else if (new_class == tsLimits.schedPolicy) {
3241 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3242 int maxClamped = MIN2(tsLimits.maxPrio,
3243 cur_class == new_class
3244 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3245 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3246 maxClamped, newPrio)
3247 : newPrio;
3248 tsInfo->ts_uprilim = cur_class == new_class
3249 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3250 if (ThreadPriorityVerbose) {
3251 tty->print_cr("TS: [%d...%d] %d->%d\n",
3252 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3253 }
3254 } else if (new_class == fxLimits.schedPolicy) {
3255 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3256 int maxClamped = MIN2(fxLimits.maxPrio,
3257 cur_class == new_class
3258 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3259 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3260 maxClamped, newPrio)
3261 : newPrio;
3262 fxInfo->fx_uprilim = cur_class == new_class
3263 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3264 fxInfo->fx_tqsecs = FX_NOCHANGE;
3265 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3266 if (ThreadPriorityVerbose) {
3267 tty->print_cr("FX: [%d...%d] %d->%d\n",
3268 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3269 }
3270 } else {
3271 if (ThreadPriorityVerbose) {
3272 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3273 }
3274 return EINVAL; // no clue, punt
3275 }
3276
3277 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3278 if (ThreadPriorityVerbose && rslt) {
3279 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3280 }
3281 if (rslt < 0) return errno;
3282
3283 #ifdef ASSERT
3284 // Sanity check: read back what we just attempted to set.
3285 // In theory it could have changed in the interim ...
3286 //
3287 // The priocntl system call is tricky.
3288 // Sometimes it'll validate the priority value argument and
3289 // return EINVAL if unhappy. At other times it fails silently.
3290 // Readbacks are prudent.
3291
3292 if (!ReadBackValidate) return 0;
3293
3294 memset(&ReadBack, 0, sizeof(pcparms_t));
3295 ReadBack.pc_cid = PC_CLNULL;
3296 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3297 assert(rslt >= 0, "priocntl failed");
3298 Actual = Expected = 0xBAD;
3299 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3300 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3301 Actual = RTPRI(ReadBack)->rt_pri;
3302 Expected = RTPRI(ParmInfo)->rt_pri;
3303 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3304 Actual = IAPRI(ReadBack)->ia_upri;
3305 Expected = IAPRI(ParmInfo)->ia_upri;
3306 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3307 Actual = TSPRI(ReadBack)->ts_upri;
3308 Expected = TSPRI(ParmInfo)->ts_upri;
3309 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3310 Actual = FXPRI(ReadBack)->fx_upri;
3311 Expected = FXPRI(ParmInfo)->fx_upri;
3312 } else {
3313 if (ThreadPriorityVerbose) {
3314 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3315 ParmInfo.pc_cid);
3316 }
3317 }
3318
3319 if (Actual != Expected) {
3320 if (ThreadPriorityVerbose) {
3321 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3322 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3323 }
3324 }
3325 #endif
3326
3327 return 0;
3328 }
3329
3330 // Solaris only gives access to 128 real priorities at a time,
3331 // so we expand Java's ten to fill this range. This would be better
3332 // if we dynamically adjusted relative priorities.
3333 //
3334 // The ThreadPriorityPolicy option allows us to select 2 different
3335 // priority scales.
3336 //
3337 // ThreadPriorityPolicy=0
3338 // Since the Solaris' default priority is MaximumPriority, we do not
3339 // set a priority lower than Max unless a priority lower than
3340 // NormPriority is requested.
3341 //
3342 // ThreadPriorityPolicy=1
3343 // This mode causes the priority table to get filled with
3344 // linear values. NormPriority get's mapped to 50% of the
3345 // Maximum priority an so on. This will cause VM threads
3346 // to get unfair treatment against other Solaris processes
3347 // which do not explicitly alter their thread priorities.
3348
3349 int os::java_to_os_priority[CriticalPriority + 1] = {
3350 -99999, // 0 Entry should never be used
3351
3352 0, // 1 MinPriority
3353 32, // 2
3354 64, // 3
3355
3356 96, // 4
3357 127, // 5 NormPriority
3358 127, // 6
3359
3360 127, // 7
3361 127, // 8
3362 127, // 9 NearMaxPriority
3363
3364 127, // 10 MaxPriority
3365
3366 -criticalPrio // 11 CriticalPriority
3367 };
3368
3369 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3370 OSThread* osthread = thread->osthread();
3371
3372 // Save requested priority in case the thread hasn't been started
3373 osthread->set_native_priority(newpri);
3374
3375 // Check for critical priority request
3376 bool fxcritical = false;
3377 if (newpri == -criticalPrio) {
3378 fxcritical = true;
3379 newpri = criticalPrio;
3380 }
3381
3382 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3383 if (!UseThreadPriorities) return OS_OK;
3384
3385 int status = 0;
3386
3387 if (!fxcritical) {
3388 // Use thr_setprio only if we have a priority that thr_setprio understands
3389 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3390 }
3391
3392 int lwp_status =
3393 set_lwp_class_and_priority(osthread->thread_id(),
3394 osthread->lwp_id(),
3395 newpri,
3396 fxcritical ? fxLimits.schedPolicy : myClass,
3397 !fxcritical);
3398 if (lwp_status != 0 && fxcritical) {
3399 // Try again, this time without changing the scheduling class
3400 newpri = java_MaxPriority_to_os_priority;
3401 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3402 osthread->lwp_id(),
3403 newpri, myClass, false);
3404 }
3405 status |= lwp_status;
3406 return (status == 0) ? OS_OK : OS_ERR;
3407 }
3408
3409
3410 OSReturn os::get_native_priority(const Thread* const thread,
3411 int *priority_ptr) {
3412 int p;
3413 if (!UseThreadPriorities) {
3414 *priority_ptr = NormalPriority;
3415 return OS_OK;
3416 }
3417 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3418 if (status != 0) {
3419 return OS_ERR;
3420 }
3421 *priority_ptr = p;
3422 return OS_OK;
3423 }
3424
3425
3426 // Hint to the underlying OS that a task switch would not be good.
3427 // Void return because it's a hint and can fail.
3428 void os::hint_no_preempt() {
3429 schedctl_start(schedctl_init());
3430 }
3431
3432 ////////////////////////////////////////////////////////////////////////////////
3433 // suspend/resume support
3434
3435 // The low-level signal-based suspend/resume support is a remnant from the
3436 // old VM-suspension that used to be for java-suspension, safepoints etc,
3437 // within hotspot. Currently used by JFR's OSThreadSampler
3438 //
3439 // The remaining code is greatly simplified from the more general suspension
3440 // code that used to be used.
3441 //
3442 // The protocol is quite simple:
3443 // - suspend:
3444 // - sends a signal to the target thread
3445 // - polls the suspend state of the osthread using a yield loop
3446 // - target thread signal handler (SR_handler) sets suspend state
3447 // and blocks in sigsuspend until continued
3448 // - resume:
3449 // - sets target osthread state to continue
3450 // - sends signal to end the sigsuspend loop in the SR_handler
3451 //
3452 // Note that the SR_lock plays no role in this suspend/resume protocol,
3453 // but is checked for NULL in SR_handler as a thread termination indicator.
3454 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3455 //
3456 // Note that resume_clear_context() and suspend_save_context() are needed
3457 // by SR_handler(), so that fetch_frame_from_ucontext() works,
3458 // which in part is used by:
3459 // - Forte Analyzer: AsyncGetCallTrace()
3460 // - StackBanging: get_frame_at_stack_banging_point()
3461 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3462
3463 static void resume_clear_context(OSThread *osthread) {
3464 osthread->set_ucontext(NULL);
3465 }
3466
3467 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3468 osthread->set_ucontext(context);
3469 }
3470
3471 static PosixSemaphore sr_semaphore;
3472
3473 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3474 // Save and restore errno to avoid confusing native code with EINTR
3475 // after sigsuspend.
3476 int old_errno = errno;
3477
3478 OSThread* osthread = thread->osthread();
3479 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3480
3481 os::SuspendResume::State current = osthread->sr.state();
3482 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3483 suspend_save_context(osthread, context);
3484
3485 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3486 os::SuspendResume::State state = osthread->sr.suspended();
3487 if (state == os::SuspendResume::SR_SUSPENDED) {
3488 sigset_t suspend_set; // signals for sigsuspend()
3489
3490 // get current set of blocked signals and unblock resume signal
3491 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3492 sigdelset(&suspend_set, ASYNC_SIGNAL);
3493
3494 sr_semaphore.signal();
3495 // wait here until we are resumed
3496 while (1) {
3497 sigsuspend(&suspend_set);
3498
3499 os::SuspendResume::State result = osthread->sr.running();
3500 if (result == os::SuspendResume::SR_RUNNING) {
3501 sr_semaphore.signal();
3502 break;
3503 }
3504 }
3505
3506 } else if (state == os::SuspendResume::SR_RUNNING) {
3507 // request was cancelled, continue
3508 } else {
3509 ShouldNotReachHere();
3510 }
3511
3512 resume_clear_context(osthread);
3513 } else if (current == os::SuspendResume::SR_RUNNING) {
3514 // request was cancelled, continue
3515 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3516 // ignore
3517 } else {
3518 // ignore
3519 }
3520
3521 errno = old_errno;
3522 }
3523
3524 void os::print_statistics() {
3525 }
3526
3527 bool os::message_box(const char* title, const char* message) {
3528 int i;
3529 fdStream err(defaultStream::error_fd());
3530 for (i = 0; i < 78; i++) err.print_raw("=");
3531 err.cr();
3532 err.print_raw_cr(title);
3533 for (i = 0; i < 78; i++) err.print_raw("-");
3534 err.cr();
3535 err.print_raw_cr(message);
3536 for (i = 0; i < 78; i++) err.print_raw("=");
3537 err.cr();
3538
3539 char buf[16];
3540 // Prevent process from exiting upon "read error" without consuming all CPU
3541 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3542
3543 return buf[0] == 'y' || buf[0] == 'Y';
3544 }
3545
3546 static int sr_notify(OSThread* osthread) {
3547 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3548 assert_status(status == 0, status, "thr_kill");
3549 return status;
3550 }
3551
3552 // "Randomly" selected value for how long we want to spin
3553 // before bailing out on suspending a thread, also how often
3554 // we send a signal to a thread we want to resume
3555 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3556 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3557
3558 static bool do_suspend(OSThread* osthread) {
3559 assert(osthread->sr.is_running(), "thread should be running");
3560 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3561
3562 // mark as suspended and send signal
3563 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3564 // failed to switch, state wasn't running?
3565 ShouldNotReachHere();
3566 return false;
3567 }
3568
3569 if (sr_notify(osthread) != 0) {
3570 ShouldNotReachHere();
3571 }
3572
3573 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3574 while (true) {
3575 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2000 * NANOSECS_PER_MILLISEC))) {
3576 break;
3577 } else {
3578 // timeout
3579 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3580 if (cancelled == os::SuspendResume::SR_RUNNING) {
3581 return false;
3582 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3583 // make sure that we consume the signal on the semaphore as well
3584 sr_semaphore.wait();
3585 break;
3586 } else {
3587 ShouldNotReachHere();
3588 return false;
3589 }
3590 }
3591 }
3592
3593 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3594 return true;
3595 }
3596
3597 static void do_resume(OSThread* osthread) {
3598 assert(osthread->sr.is_suspended(), "thread should be suspended");
3599 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3600
3601 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3602 // failed to switch to WAKEUP_REQUEST
3603 ShouldNotReachHere();
3604 return;
3605 }
3606
3607 while (true) {
3608 if (sr_notify(osthread) == 0) {
3609 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
3610 if (osthread->sr.is_running()) {
3611 return;
3612 }
3613 }
3614 } else {
3615 ShouldNotReachHere();
3616 }
3617 }
3618
3619 guarantee(osthread->sr.is_running(), "Must be running!");
3620 }
3621
3622 void os::SuspendedThreadTask::internal_do_task() {
3623 if (do_suspend(_thread->osthread())) {
3624 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3625 do_task(context);
3626 do_resume(_thread->osthread());
3627 }
3628 }
3629
3630 // This does not do anything on Solaris. This is basically a hook for being
3631 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3632 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3633 const methodHandle& method, JavaCallArguments* args,
3634 Thread* thread) {
3635 f(value, method, args, thread);
3636 }
3637
3638 // This routine may be used by user applications as a "hook" to catch signals.
3639 // The user-defined signal handler must pass unrecognized signals to this
3640 // routine, and if it returns true (non-zero), then the signal handler must
3641 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3642 // routine will never retun false (zero), but instead will execute a VM panic
3643 // routine kill the process.
3644 //
3645 // If this routine returns false, it is OK to call it again. This allows
3646 // the user-defined signal handler to perform checks either before or after
3647 // the VM performs its own checks. Naturally, the user code would be making
3648 // a serious error if it tried to handle an exception (such as a null check
3649 // or breakpoint) that the VM was generating for its own correct operation.
3650 //
3651 // This routine may recognize any of the following kinds of signals:
3652 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3653 // ASYNC_SIGNAL.
3654 // It should be consulted by handlers for any of those signals.
3655 //
3656 // The caller of this routine must pass in the three arguments supplied
3657 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3658 // field of the structure passed to sigaction(). This routine assumes that
3659 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3660 //
3661 // Note that the VM will print warnings if it detects conflicting signal
3662 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3663 //
3664 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3665 siginfo_t* siginfo,
3666 void* ucontext,
3667 int abort_if_unrecognized);
3668
3669
3670 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3671 int orig_errno = errno; // Preserve errno value over signal handler.
3672 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3673 errno = orig_errno;
3674 }
3675
3676 // This boolean allows users to forward their own non-matching signals
3677 // to JVM_handle_solaris_signal, harmlessly.
3678 bool os::Solaris::signal_handlers_are_installed = false;
3679
3680 // For signal-chaining
3681 bool os::Solaris::libjsig_is_loaded = false;
3682 typedef struct sigaction *(*get_signal_t)(int);
3683 get_signal_t os::Solaris::get_signal_action = NULL;
3684
3685 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3686 struct sigaction *actp = NULL;
3687
3688 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3689 // Retrieve the old signal handler from libjsig
3690 actp = (*get_signal_action)(sig);
3691 }
3692 if (actp == NULL) {
3693 // Retrieve the preinstalled signal handler from jvm
3694 actp = get_preinstalled_handler(sig);
3695 }
3696
3697 return actp;
3698 }
3699
3700 static bool call_chained_handler(struct sigaction *actp, int sig,
3701 siginfo_t *siginfo, void *context) {
3702 // Call the old signal handler
3703 if (actp->sa_handler == SIG_DFL) {
3704 // It's more reasonable to let jvm treat it as an unexpected exception
3705 // instead of taking the default action.
3706 return false;
3707 } else if (actp->sa_handler != SIG_IGN) {
3708 if ((actp->sa_flags & SA_NODEFER) == 0) {
3709 // automaticlly block the signal
3710 sigaddset(&(actp->sa_mask), sig);
3711 }
3712
3713 sa_handler_t hand;
3714 sa_sigaction_t sa;
3715 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3716 // retrieve the chained handler
3717 if (siginfo_flag_set) {
3718 sa = actp->sa_sigaction;
3719 } else {
3720 hand = actp->sa_handler;
3721 }
3722
3723 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3724 actp->sa_handler = SIG_DFL;
3725 }
3726
3727 // try to honor the signal mask
3728 sigset_t oset;
3729 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3730
3731 // call into the chained handler
3732 if (siginfo_flag_set) {
3733 (*sa)(sig, siginfo, context);
3734 } else {
3735 (*hand)(sig);
3736 }
3737
3738 // restore the signal mask
3739 pthread_sigmask(SIG_SETMASK, &oset, 0);
3740 }
3741 // Tell jvm's signal handler the signal is taken care of.
3742 return true;
3743 }
3744
3745 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3746 bool chained = false;
3747 // signal-chaining
3748 if (UseSignalChaining) {
3749 struct sigaction *actp = get_chained_signal_action(sig);
3750 if (actp != NULL) {
3751 chained = call_chained_handler(actp, sig, siginfo, context);
3752 }
3753 }
3754 return chained;
3755 }
3756
3757 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3758 assert((chainedsigactions != (struct sigaction *)NULL) &&
3759 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3760 if (preinstalled_sigs[sig] != 0) {
3761 return &chainedsigactions[sig];
3762 }
3763 return NULL;
3764 }
3765
3766 void os::Solaris::save_preinstalled_handler(int sig,
3767 struct sigaction& oldAct) {
3768 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3769 assert((chainedsigactions != (struct sigaction *)NULL) &&
3770 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3771 chainedsigactions[sig] = oldAct;
3772 preinstalled_sigs[sig] = 1;
3773 }
3774
3775 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3776 bool oktochain) {
3777 // Check for overwrite.
3778 struct sigaction oldAct;
3779 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3780 void* oldhand =
3781 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3782 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3783 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3784 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3785 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3786 if (AllowUserSignalHandlers || !set_installed) {
3787 // Do not overwrite; user takes responsibility to forward to us.
3788 return;
3789 } else if (UseSignalChaining) {
3790 if (oktochain) {
3791 // save the old handler in jvm
3792 save_preinstalled_handler(sig, oldAct);
3793 } else {
3794 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3795 }
3796 // libjsig also interposes the sigaction() call below and saves the
3797 // old sigaction on it own.
3798 } else {
3799 fatal("Encountered unexpected pre-existing sigaction handler "
3800 "%#lx for signal %d.", (long)oldhand, sig);
3801 }
3802 }
3803
3804 struct sigaction sigAct;
3805 sigfillset(&(sigAct.sa_mask));
3806 sigAct.sa_handler = SIG_DFL;
3807
3808 sigAct.sa_sigaction = signalHandler;
3809 // Handle SIGSEGV on alternate signal stack if
3810 // not using stack banging
3811 if (!UseStackBanging && sig == SIGSEGV) {
3812 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3813 } else {
3814 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3815 }
3816 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3817
3818 sigaction(sig, &sigAct, &oldAct);
3819
3820 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3821 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3822 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3823 }
3824
3825
3826 #define DO_SIGNAL_CHECK(sig) \
3827 do { \
3828 if (!sigismember(&check_signal_done, sig)) { \
3829 os::Solaris::check_signal_handler(sig); \
3830 } \
3831 } while (0)
3832
3833 // This method is a periodic task to check for misbehaving JNI applications
3834 // under CheckJNI, we can add any periodic checks here
3835
3836 void os::run_periodic_checks() {
3837 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3838 // thereby preventing a NULL checks.
3839 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3840
3841 if (check_signals == false) return;
3842
3843 // SEGV and BUS if overridden could potentially prevent
3844 // generation of hs*.log in the event of a crash, debugging
3845 // such a case can be very challenging, so we absolutely
3846 // check for the following for a good measure:
3847 DO_SIGNAL_CHECK(SIGSEGV);
3848 DO_SIGNAL_CHECK(SIGILL);
3849 DO_SIGNAL_CHECK(SIGFPE);
3850 DO_SIGNAL_CHECK(SIGBUS);
3851 DO_SIGNAL_CHECK(SIGPIPE);
3852 DO_SIGNAL_CHECK(SIGXFSZ);
3853 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3854
3855 // ReduceSignalUsage allows the user to override these handlers
3856 // see comments at the very top and jvm_solaris.h
3857 if (!ReduceSignalUsage) {
3858 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3859 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3860 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3861 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3862 }
3863 }
3864
3865 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3866
3867 static os_sigaction_t os_sigaction = NULL;
3868
3869 void os::Solaris::check_signal_handler(int sig) {
3870 char buf[O_BUFLEN];
3871 address jvmHandler = NULL;
3872
3873 struct sigaction act;
3874 if (os_sigaction == NULL) {
3875 // only trust the default sigaction, in case it has been interposed
3876 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3877 if (os_sigaction == NULL) return;
3878 }
3879
3880 os_sigaction(sig, (struct sigaction*)NULL, &act);
3881
3882 address thisHandler = (act.sa_flags & SA_SIGINFO)
3883 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3884 : CAST_FROM_FN_PTR(address, act.sa_handler);
3885
3886
3887 switch (sig) {
3888 case SIGSEGV:
3889 case SIGBUS:
3890 case SIGFPE:
3891 case SIGPIPE:
3892 case SIGXFSZ:
3893 case SIGILL:
3894 case ASYNC_SIGNAL:
3895 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3896 break;
3897
3898 case SHUTDOWN1_SIGNAL:
3899 case SHUTDOWN2_SIGNAL:
3900 case SHUTDOWN3_SIGNAL:
3901 case BREAK_SIGNAL:
3902 jvmHandler = (address)user_handler();
3903 break;
3904
3905 default:
3906 return;
3907 }
3908
3909 if (thisHandler != jvmHandler) {
3910 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3911 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3912 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3913 // No need to check this sig any longer
3914 sigaddset(&check_signal_done, sig);
3915 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3916 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3917 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3918 exception_name(sig, buf, O_BUFLEN));
3919 }
3920 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3921 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3922 tty->print("expected:");
3923 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3924 tty->cr();
3925 tty->print(" found:");
3926 os::Posix::print_sa_flags(tty, act.sa_flags);
3927 tty->cr();
3928 // No need to check this sig any longer
3929 sigaddset(&check_signal_done, sig);
3930 }
3931
3932 // Print all the signal handler state
3933 if (sigismember(&check_signal_done, sig)) {
3934 print_signal_handlers(tty, buf, O_BUFLEN);
3935 }
3936
3937 }
3938
3939 void os::Solaris::install_signal_handlers() {
3940 signal_handlers_are_installed = true;
3941
3942 // signal-chaining
3943 typedef void (*signal_setting_t)();
3944 signal_setting_t begin_signal_setting = NULL;
3945 signal_setting_t end_signal_setting = NULL;
3946 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3947 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3948 if (begin_signal_setting != NULL) {
3949 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3950 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3951 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3952 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3953 libjsig_is_loaded = true;
3954 assert(UseSignalChaining, "should enable signal-chaining");
3955 }
3956 if (libjsig_is_loaded) {
3957 // Tell libjsig jvm is setting signal handlers
3958 (*begin_signal_setting)();
3959 }
3960
3961 set_signal_handler(SIGSEGV, true, true);
3962 set_signal_handler(SIGPIPE, true, true);
3963 set_signal_handler(SIGXFSZ, true, true);
3964 set_signal_handler(SIGBUS, true, true);
3965 set_signal_handler(SIGILL, true, true);
3966 set_signal_handler(SIGFPE, true, true);
3967 set_signal_handler(ASYNC_SIGNAL, true, true);
3968
3969 if (libjsig_is_loaded) {
3970 // Tell libjsig jvm finishes setting signal handlers
3971 (*end_signal_setting)();
3972 }
3973
3974 // We don't activate signal checker if libjsig is in place, we trust ourselves
3975 // and if UserSignalHandler is installed all bets are off.
3976 // Log that signal checking is off only if -verbose:jni is specified.
3977 if (CheckJNICalls) {
3978 if (libjsig_is_loaded) {
3979 if (PrintJNIResolving) {
3980 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3981 }
3982 check_signals = false;
3983 }
3984 if (AllowUserSignalHandlers) {
3985 if (PrintJNIResolving) {
3986 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3987 }
3988 check_signals = false;
3989 }
3990 }
3991 }
3992
3993
3994 void report_error(const char* file_name, int line_no, const char* title,
3995 const char* format, ...);
3996
3997 // (Static) wrappers for the liblgrp API
3998 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
3999 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4000 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4001 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4002 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4003 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4004 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4005 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4006 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4007
4008 static address resolve_symbol_lazy(const char* name) {
4009 address addr = (address) dlsym(RTLD_DEFAULT, name);
4010 if (addr == NULL) {
4011 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4012 addr = (address) dlsym(RTLD_NEXT, name);
4013 }
4014 return addr;
4015 }
4016
4017 static address resolve_symbol(const char* name) {
4018 address addr = resolve_symbol_lazy(name);
4019 if (addr == NULL) {
4020 fatal(dlerror());
4021 }
4022 return addr;
4023 }
4024
4025 void os::Solaris::libthread_init() {
4026 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4027
4028 lwp_priocntl_init();
4029
4030 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4031 if (func == NULL) {
4032 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4033 // Guarantee that this VM is running on an new enough OS (5.6 or
4034 // later) that it will have a new enough libthread.so.
4035 guarantee(func != NULL, "libthread.so is too old.");
4036 }
4037
4038 int size;
4039 void (*handler_info_func)(address *, int *);
4040 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4041 handler_info_func(&handler_start, &size);
4042 handler_end = handler_start + size;
4043 }
4044
4045
4046 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4047 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4048 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4049 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4050 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4051 int os::Solaris::_mutex_scope = USYNC_THREAD;
4052
4053 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4054 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4055 int_fnP_cond_tP os::Solaris::_cond_signal;
4056 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4057 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4058 int_fnP_cond_tP os::Solaris::_cond_destroy;
4059 int os::Solaris::_cond_scope = USYNC_THREAD;
4060 bool os::Solaris::_synchronization_initialized;
4061
4062 void os::Solaris::synchronization_init() {
4063 if (UseLWPSynchronization) {
4064 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4065 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4066 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4067 os::Solaris::set_mutex_init(lwp_mutex_init);
4068 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4069 os::Solaris::set_mutex_scope(USYNC_THREAD);
4070
4071 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4072 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4073 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4074 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4075 os::Solaris::set_cond_init(lwp_cond_init);
4076 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4077 os::Solaris::set_cond_scope(USYNC_THREAD);
4078 } else {
4079 os::Solaris::set_mutex_scope(USYNC_THREAD);
4080 os::Solaris::set_cond_scope(USYNC_THREAD);
4081
4082 if (UsePthreads) {
4083 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4084 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4085 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4086 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4087 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4088
4089 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4090 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4091 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4092 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4093 os::Solaris::set_cond_init(pthread_cond_default_init);
4094 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4095 } else {
4096 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4097 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4098 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4099 os::Solaris::set_mutex_init(::mutex_init);
4100 os::Solaris::set_mutex_destroy(::mutex_destroy);
4101
4102 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4103 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4104 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4105 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4106 os::Solaris::set_cond_init(::cond_init);
4107 os::Solaris::set_cond_destroy(::cond_destroy);
4108 }
4109 }
4110 _synchronization_initialized = true;
4111 }
4112
4113 bool os::Solaris::liblgrp_init() {
4114 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4115 if (handle != NULL) {
4116 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4117 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4118 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4119 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4120 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4121 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4122 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4123 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4124 dlsym(handle, "lgrp_cookie_stale")));
4125
4126 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4127 set_lgrp_cookie(c);
4128 return true;
4129 }
4130 return false;
4131 }
4132
4133 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4134 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4135 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4136
4137 void init_pset_getloadavg_ptr(void) {
4138 pset_getloadavg_ptr =
4139 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4140 if (pset_getloadavg_ptr == NULL) {
4141 log_warning(os)("pset_getloadavg function not found");
4142 }
4143 }
4144
4145 int os::Solaris::_dev_zero_fd = -1;
4146
4147 // this is called _before_ the global arguments have been parsed
4148 void os::init(void) {
4149 _initial_pid = getpid();
4150
4151 max_hrtime = first_hrtime = gethrtime();
4152
4153 init_random(1234567);
4154
4155 page_size = sysconf(_SC_PAGESIZE);
4156 if (page_size == -1) {
4157 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4158 }
4159 init_page_sizes((size_t) page_size);
4160
4161 Solaris::initialize_system_info();
4162
4163 int fd = ::open("/dev/zero", O_RDWR);
4164 if (fd < 0) {
4165 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4166 } else {
4167 Solaris::set_dev_zero_fd(fd);
4168
4169 // Close on exec, child won't inherit.
4170 fcntl(fd, F_SETFD, FD_CLOEXEC);
4171 }
4172
4173 clock_tics_per_sec = CLK_TCK;
4174
4175 // check if dladdr1() exists; dladdr1 can provide more information than
4176 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4177 // and is available on linker patches for 5.7 and 5.8.
4178 // libdl.so must have been loaded, this call is just an entry lookup
4179 void * hdl = dlopen("libdl.so", RTLD_NOW);
4180 if (hdl) {
4181 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4182 }
4183
4184 // main_thread points to the thread that created/loaded the JVM.
4185 main_thread = thr_self();
4186
4187 // dynamic lookup of functions that may not be available in our lowest
4188 // supported Solaris release
4189 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4190 if (handle != NULL) {
4191 Solaris::_pthread_setname_np = // from 11.3
4192 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4193 }
4194 }
4195
4196 // To install functions for atexit system call
4197 extern "C" {
4198 static void perfMemory_exit_helper() {
4199 perfMemory_exit();
4200 }
4201 }
4202
4203 // this is called _after_ the global arguments have been parsed
4204 jint os::init_2(void) {
4205 // try to enable extended file IO ASAP, see 6431278
4206 os::Solaris::try_enable_extended_io();
4207
4208 // Check and sets minimum stack sizes against command line options
4209 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4210 return JNI_ERR;
4211 }
4212
4213 Solaris::libthread_init();
4214
4215 if (UseNUMA) {
4216 if (!Solaris::liblgrp_init()) {
4217 UseNUMA = false;
4218 } else {
4219 size_t lgrp_limit = os::numa_get_groups_num();
4220 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4221 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4222 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4223 if (lgrp_num < 2) {
4224 // There's only one locality group, disable NUMA.
4225 UseNUMA = false;
4226 }
4227 }
4228 if (!UseNUMA && ForceNUMA) {
4229 UseNUMA = true;
4230 }
4231 }
4232
4233 Solaris::signal_sets_init();
4234 Solaris::init_signal_mem();
4235 Solaris::install_signal_handlers();
4236 // Initialize data for jdk.internal.misc.Signal
4237 if (!ReduceSignalUsage) {
4238 jdk_misc_signal_init();
4239 }
4240
4241 // initialize synchronization primitives to use either thread or
4242 // lwp synchronization (controlled by UseLWPSynchronization)
4243 Solaris::synchronization_init();
4244
4245 if (MaxFDLimit) {
4246 // set the number of file descriptors to max. print out error
4247 // if getrlimit/setrlimit fails but continue regardless.
4248 struct rlimit nbr_files;
4249 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4250 if (status != 0) {
4251 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4252 } else {
4253 nbr_files.rlim_cur = nbr_files.rlim_max;
4254 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4255 if (status != 0) {
4256 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4257 }
4258 }
4259 }
4260
4261 // Calculate theoretical max. size of Threads to guard gainst
4262 // artifical out-of-memory situations, where all available address-
4263 // space has been reserved by thread stacks. Default stack size is 1Mb.
4264 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4265 JavaThread::stack_size_at_create() : (1*K*K);
4266 assert(pre_thread_stack_size != 0, "Must have a stack");
4267 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4268 // we should start doing Virtual Memory banging. Currently when the threads will
4269 // have used all but 200Mb of space.
4270 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4271 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4272
4273 // at-exit methods are called in the reverse order of their registration.
4274 // In Solaris 7 and earlier, atexit functions are called on return from
4275 // main or as a result of a call to exit(3C). There can be only 32 of
4276 // these functions registered and atexit() does not set errno. In Solaris
4277 // 8 and later, there is no limit to the number of functions registered
4278 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4279 // functions are called upon dlclose(3DL) in addition to return from main
4280 // and exit(3C).
4281
4282 if (PerfAllowAtExitRegistration) {
4283 // only register atexit functions if PerfAllowAtExitRegistration is set.
4284 // atexit functions can be delayed until process exit time, which
4285 // can be problematic for embedded VM situations. Embedded VMs should
4286 // call DestroyJavaVM() to assure that VM resources are released.
4287
4288 // note: perfMemory_exit_helper atexit function may be removed in
4289 // the future if the appropriate cleanup code can be added to the
4290 // VM_Exit VMOperation's doit method.
4291 if (atexit(perfMemory_exit_helper) != 0) {
4292 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4293 }
4294 }
4295
4296 // Init pset_loadavg function pointer
4297 init_pset_getloadavg_ptr();
4298
4299 return JNI_OK;
4300 }
4301
4302 // Mark the polling page as unreadable
4303 void os::make_polling_page_unreadable(void) {
4304 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4305 fatal("Could not disable polling page");
4306 }
4307 }
4308
4309 // Mark the polling page as readable
4310 void os::make_polling_page_readable(void) {
4311 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4312 fatal("Could not enable polling page");
4313 }
4314 }
4315
4316 // Is a (classpath) directory empty?
4317 bool os::dir_is_empty(const char* path) {
4318 DIR *dir = NULL;
4319 struct dirent *ptr;
4320
4321 dir = opendir(path);
4322 if (dir == NULL) return true;
4323
4324 // Scan the directory
4325 bool result = true;
4326 char buf[sizeof(struct dirent) + MAX_PATH];
4327 struct dirent *dbuf = (struct dirent *) buf;
4328 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4329 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4330 result = false;
4331 }
4332 }
4333 closedir(dir);
4334 return result;
4335 }
4336
4337 // This code originates from JDK's sysOpen and open64_w
4338 // from src/solaris/hpi/src/system_md.c
4339
4340 int os::open(const char *path, int oflag, int mode) {
4341 if (strlen(path) > MAX_PATH - 1) {
4342 errno = ENAMETOOLONG;
4343 return -1;
4344 }
4345 int fd;
4346
4347 fd = ::open64(path, oflag, mode);
4348 if (fd == -1) return -1;
4349
4350 // If the open succeeded, the file might still be a directory
4351 {
4352 struct stat64 buf64;
4353 int ret = ::fstat64(fd, &buf64);
4354 int st_mode = buf64.st_mode;
4355
4356 if (ret != -1) {
4357 if ((st_mode & S_IFMT) == S_IFDIR) {
4358 errno = EISDIR;
4359 ::close(fd);
4360 return -1;
4361 }
4362 } else {
4363 ::close(fd);
4364 return -1;
4365 }
4366 }
4367
4368 // 32-bit Solaris systems suffer from:
4369 //
4370 // - an historical default soft limit of 256 per-process file
4371 // descriptors that is too low for many Java programs.
4372 //
4373 // - a design flaw where file descriptors created using stdio
4374 // fopen must be less than 256, _even_ when the first limit above
4375 // has been raised. This can cause calls to fopen (but not calls to
4376 // open, for example) to fail mysteriously, perhaps in 3rd party
4377 // native code (although the JDK itself uses fopen). One can hardly
4378 // criticize them for using this most standard of all functions.
4379 //
4380 // We attempt to make everything work anyways by:
4381 //
4382 // - raising the soft limit on per-process file descriptors beyond
4383 // 256
4384 //
4385 // - As of Solaris 10u4, we can request that Solaris raise the 256
4386 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4387 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4388 //
4389 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4390 // workaround the bug by remapping non-stdio file descriptors below
4391 // 256 to ones beyond 256, which is done below.
4392 //
4393 // See:
4394 // 1085341: 32-bit stdio routines should support file descriptors >255
4395 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4396 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4397 // enable_extended_FILE_stdio() in VM initialisation
4398 // Giri Mandalika's blog
4399 // http://technopark02.blogspot.com/2005_05_01_archive.html
4400 //
4401 #ifndef _LP64
4402 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4403 int newfd = ::fcntl(fd, F_DUPFD, 256);
4404 if (newfd != -1) {
4405 ::close(fd);
4406 fd = newfd;
4407 }
4408 }
4409 #endif // 32-bit Solaris
4410
4411 // All file descriptors that are opened in the JVM and not
4412 // specifically destined for a subprocess should have the
4413 // close-on-exec flag set. If we don't set it, then careless 3rd
4414 // party native code might fork and exec without closing all
4415 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4416 // UNIXProcess.c), and this in turn might:
4417 //
4418 // - cause end-of-file to fail to be detected on some file
4419 // descriptors, resulting in mysterious hangs, or
4420 //
4421 // - might cause an fopen in the subprocess to fail on a system
4422 // suffering from bug 1085341.
4423 //
4424 // (Yes, the default setting of the close-on-exec flag is a Unix
4425 // design flaw)
4426 //
4427 // See:
4428 // 1085341: 32-bit stdio routines should support file descriptors >255
4429 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4430 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4431 //
4432 #ifdef FD_CLOEXEC
4433 {
4434 int flags = ::fcntl(fd, F_GETFD);
4435 if (flags != -1) {
4436 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4437 }
4438 }
4439 #endif
4440
4441 return fd;
4442 }
4443
4444 // create binary file, rewriting existing file if required
4445 int os::create_binary_file(const char* path, bool rewrite_existing) {
4446 int oflags = O_WRONLY | O_CREAT;
4447 if (!rewrite_existing) {
4448 oflags |= O_EXCL;
4449 }
4450 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4451 }
4452
4453 // return current position of file pointer
4454 jlong os::current_file_offset(int fd) {
4455 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4456 }
4457
4458 // move file pointer to the specified offset
4459 jlong os::seek_to_file_offset(int fd, jlong offset) {
4460 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4461 }
4462
4463 jlong os::lseek(int fd, jlong offset, int whence) {
4464 return (jlong) ::lseek64(fd, offset, whence);
4465 }
4466
4467 int os::ftruncate(int fd, jlong length) {
4468 return ::ftruncate64(fd, length);
4469 }
4470
4471 int os::fsync(int fd) {
4472 RESTARTABLE_RETURN_INT(::fsync(fd));
4473 }
4474
4475 int os::available(int fd, jlong *bytes) {
4476 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4477 "Assumed _thread_in_native");
4478 jlong cur, end;
4479 int mode;
4480 struct stat64 buf64;
4481
4482 if (::fstat64(fd, &buf64) >= 0) {
4483 mode = buf64.st_mode;
4484 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4485 int n,ioctl_return;
4486
4487 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4488 if (ioctl_return>= 0) {
4489 *bytes = n;
4490 return 1;
4491 }
4492 }
4493 }
4494 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4495 return 0;
4496 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4497 return 0;
4498 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4499 return 0;
4500 }
4501 *bytes = end - cur;
4502 return 1;
4503 }
4504
4505 // Map a block of memory.
4506 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4507 char *addr, size_t bytes, bool read_only,
4508 bool allow_exec) {
4509 int prot;
4510 int flags;
4511
4512 if (read_only) {
4513 prot = PROT_READ;
4514 flags = MAP_SHARED;
4515 } else {
4516 prot = PROT_READ | PROT_WRITE;
4517 flags = MAP_PRIVATE;
4518 }
4519
4520 if (allow_exec) {
4521 prot |= PROT_EXEC;
4522 }
4523
4524 if (addr != NULL) {
4525 flags |= MAP_FIXED;
4526 }
4527
4528 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4529 fd, file_offset);
4530 if (mapped_address == MAP_FAILED) {
4531 return NULL;
4532 }
4533 return mapped_address;
4534 }
4535
4536
4537 // Remap a block of memory.
4538 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4539 char *addr, size_t bytes, bool read_only,
4540 bool allow_exec) {
4541 // same as map_memory() on this OS
4542 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4543 allow_exec);
4544 }
4545
4546
4547 // Unmap a block of memory.
4548 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4549 return munmap(addr, bytes) == 0;
4550 }
4551
4552 void os::pause() {
4553 char filename[MAX_PATH];
4554 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4555 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4556 } else {
4557 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4558 }
4559
4560 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4561 if (fd != -1) {
4562 struct stat buf;
4563 ::close(fd);
4564 while (::stat(filename, &buf) == 0) {
4565 (void)::poll(NULL, 0, 100);
4566 }
4567 } else {
4568 jio_fprintf(stderr,
4569 "Could not open pause file '%s', continuing immediately.\n", filename);
4570 }
4571 }
4572
4573 #ifndef PRODUCT
4574 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4575 // Turn this on if you need to trace synch operations.
4576 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4577 // and call record_synch_enable and record_synch_disable
4578 // around the computation of interest.
4579
4580 void record_synch(char* name, bool returning); // defined below
4581
4582 class RecordSynch {
4583 char* _name;
4584 public:
4585 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4586 ~RecordSynch() { record_synch(_name, true); }
4587 };
4588
4589 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4590 extern "C" ret name params { \
4591 typedef ret name##_t params; \
4592 static name##_t* implem = NULL; \
4593 static int callcount = 0; \
4594 if (implem == NULL) { \
4595 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4596 if (implem == NULL) fatal(dlerror()); \
4597 } \
4598 ++callcount; \
4599 RecordSynch _rs(#name); \
4600 inner; \
4601 return implem args; \
4602 }
4603 // in dbx, examine callcounts this way:
4604 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4605
4606 #define CHECK_POINTER_OK(p) \
4607 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4608 #define CHECK_MU \
4609 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4610 #define CHECK_CV \
4611 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4612 #define CHECK_P(p) \
4613 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4614
4615 #define CHECK_MUTEX(mutex_op) \
4616 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4617
4618 CHECK_MUTEX( mutex_lock)
4619 CHECK_MUTEX( _mutex_lock)
4620 CHECK_MUTEX( mutex_unlock)
4621 CHECK_MUTEX(_mutex_unlock)
4622 CHECK_MUTEX( mutex_trylock)
4623 CHECK_MUTEX(_mutex_trylock)
4624
4625 #define CHECK_COND(cond_op) \
4626 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4627
4628 CHECK_COND( cond_wait);
4629 CHECK_COND(_cond_wait);
4630 CHECK_COND(_cond_wait_cancel);
4631
4632 #define CHECK_COND2(cond_op) \
4633 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4634
4635 CHECK_COND2( cond_timedwait);
4636 CHECK_COND2(_cond_timedwait);
4637 CHECK_COND2(_cond_timedwait_cancel);
4638
4639 // do the _lwp_* versions too
4640 #define mutex_t lwp_mutex_t
4641 #define cond_t lwp_cond_t
4642 CHECK_MUTEX( _lwp_mutex_lock)
4643 CHECK_MUTEX( _lwp_mutex_unlock)
4644 CHECK_MUTEX( _lwp_mutex_trylock)
4645 CHECK_MUTEX( __lwp_mutex_lock)
4646 CHECK_MUTEX( __lwp_mutex_unlock)
4647 CHECK_MUTEX( __lwp_mutex_trylock)
4648 CHECK_MUTEX(___lwp_mutex_lock)
4649 CHECK_MUTEX(___lwp_mutex_unlock)
4650
4651 CHECK_COND( _lwp_cond_wait);
4652 CHECK_COND( __lwp_cond_wait);
4653 CHECK_COND(___lwp_cond_wait);
4654
4655 CHECK_COND2( _lwp_cond_timedwait);
4656 CHECK_COND2( __lwp_cond_timedwait);
4657 #undef mutex_t
4658 #undef cond_t
4659
4660 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4661 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4662 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4663 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4664 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4665 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4666 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4667 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4668
4669
4670 // recording machinery:
4671
4672 enum { RECORD_SYNCH_LIMIT = 200 };
4673 char* record_synch_name[RECORD_SYNCH_LIMIT];
4674 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4675 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4676 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4677 int record_synch_count = 0;
4678 bool record_synch_enabled = false;
4679
4680 // in dbx, examine recorded data this way:
4681 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4682
4683 void record_synch(char* name, bool returning) {
4684 if (record_synch_enabled) {
4685 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4686 record_synch_name[record_synch_count] = name;
4687 record_synch_returning[record_synch_count] = returning;
4688 record_synch_thread[record_synch_count] = thr_self();
4689 record_synch_arg0ptr[record_synch_count] = &name;
4690 record_synch_count++;
4691 }
4692 // put more checking code here:
4693 // ...
4694 }
4695 }
4696
4697 void record_synch_enable() {
4698 // start collecting trace data, if not already doing so
4699 if (!record_synch_enabled) record_synch_count = 0;
4700 record_synch_enabled = true;
4701 }
4702
4703 void record_synch_disable() {
4704 // stop collecting trace data
4705 record_synch_enabled = false;
4706 }
4707
4708 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4709 #endif // PRODUCT
4710
4711 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4712 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4713 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4714
4715
4716 // JVMTI & JVM monitoring and management support
4717 // The thread_cpu_time() and current_thread_cpu_time() are only
4718 // supported if is_thread_cpu_time_supported() returns true.
4719 // They are not supported on Solaris T1.
4720
4721 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4722 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4723 // of a thread.
4724 //
4725 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4726 // returns the fast estimate available on the platform.
4727
4728 // hrtime_t gethrvtime() return value includes
4729 // user time but does not include system time
4730 jlong os::current_thread_cpu_time() {
4731 return (jlong) gethrvtime();
4732 }
4733
4734 jlong os::thread_cpu_time(Thread *thread) {
4735 // return user level CPU time only to be consistent with
4736 // what current_thread_cpu_time returns.
4737 // thread_cpu_time_info() must be changed if this changes
4738 return os::thread_cpu_time(thread, false /* user time only */);
4739 }
4740
4741 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4742 if (user_sys_cpu_time) {
4743 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4744 } else {
4745 return os::current_thread_cpu_time();
4746 }
4747 }
4748
4749 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4750 char proc_name[64];
4751 int count;
4752 prusage_t prusage;
4753 jlong lwp_time;
4754 int fd;
4755
4756 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4757 getpid(),
4758 thread->osthread()->lwp_id());
4759 fd = ::open(proc_name, O_RDONLY);
4760 if (fd == -1) return -1;
4761
4762 do {
4763 count = ::pread(fd,
4764 (void *)&prusage.pr_utime,
4765 thr_time_size,
4766 thr_time_off);
4767 } while (count < 0 && errno == EINTR);
4768 ::close(fd);
4769 if (count < 0) return -1;
4770
4771 if (user_sys_cpu_time) {
4772 // user + system CPU time
4773 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4774 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4775 (jlong)prusage.pr_stime.tv_nsec +
4776 (jlong)prusage.pr_utime.tv_nsec;
4777 } else {
4778 // user level CPU time only
4779 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4780 (jlong)prusage.pr_utime.tv_nsec;
4781 }
4782
4783 return (lwp_time);
4784 }
4785
4786 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4787 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4788 info_ptr->may_skip_backward = false; // elapsed time not wall time
4789 info_ptr->may_skip_forward = false; // elapsed time not wall time
4790 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4791 }
4792
4793 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4794 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4795 info_ptr->may_skip_backward = false; // elapsed time not wall time
4796 info_ptr->may_skip_forward = false; // elapsed time not wall time
4797 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4798 }
4799
4800 bool os::is_thread_cpu_time_supported() {
4801 return true;
4802 }
4803
4804 // System loadavg support. Returns -1 if load average cannot be obtained.
4805 // Return the load average for our processor set if the primitive exists
4806 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4807 int os::loadavg(double loadavg[], int nelem) {
4808 if (pset_getloadavg_ptr != NULL) {
4809 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4810 } else {
4811 return ::getloadavg(loadavg, nelem);
4812 }
4813 }
4814
4815 //---------------------------------------------------------------------------------
4816
4817 bool os::find(address addr, outputStream* st) {
4818 Dl_info dlinfo;
4819 memset(&dlinfo, 0, sizeof(dlinfo));
4820 if (dladdr(addr, &dlinfo) != 0) {
4821 st->print(PTR_FORMAT ": ", addr);
4822 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4823 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4824 } else if (dlinfo.dli_fbase != NULL) {
4825 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4826 } else {
4827 st->print("<absolute address>");
4828 }
4829 if (dlinfo.dli_fname != NULL) {
4830 st->print(" in %s", dlinfo.dli_fname);
4831 }
4832 if (dlinfo.dli_fbase != NULL) {
4833 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4834 }
4835 st->cr();
4836
4837 if (Verbose) {
4838 // decode some bytes around the PC
4839 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4840 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4841 address lowest = (address) dlinfo.dli_sname;
4842 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4843 if (begin < lowest) begin = lowest;
4844 Dl_info dlinfo2;
4845 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4846 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4847 end = (address) dlinfo2.dli_saddr;
4848 }
4849 Disassembler::decode(begin, end, st);
4850 }
4851 return true;
4852 }
4853 return false;
4854 }
4855
4856 // Following function has been added to support HotSparc's libjvm.so running
4857 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4858 // src/solaris/hpi/native_threads in the EVM codebase.
4859 //
4860 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4861 // libraries and should thus be removed. We will leave it behind for a while
4862 // until we no longer want to able to run on top of 1.3.0 Solaris production
4863 // JDK. See 4341971.
4864
4865 #define STACK_SLACK 0x800
4866
4867 extern "C" {
4868 intptr_t sysThreadAvailableStackWithSlack() {
4869 stack_t st;
4870 intptr_t retval, stack_top;
4871 retval = thr_stksegment(&st);
4872 assert(retval == 0, "incorrect return value from thr_stksegment");
4873 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4874 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4875 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4876 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4877 }
4878 }
4879
4880 // ObjectMonitor park-unpark infrastructure ...
4881 //
4882 // We implement Solaris and Linux PlatformEvents with the
4883 // obvious condvar-mutex-flag triple.
4884 // Another alternative that works quite well is pipes:
4885 // Each PlatformEvent consists of a pipe-pair.
4886 // The thread associated with the PlatformEvent
4887 // calls park(), which reads from the input end of the pipe.
4888 // Unpark() writes into the other end of the pipe.
4889 // The write-side of the pipe must be set NDELAY.
4890 // Unfortunately pipes consume a large # of handles.
4891 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4892 // Using pipes for the 1st few threads might be workable, however.
4893 //
4894 // park() is permitted to return spuriously.
4895 // Callers of park() should wrap the call to park() in
4896 // an appropriate loop. A litmus test for the correct
4897 // usage of park is the following: if park() were modified
4898 // to immediately return 0 your code should still work,
4899 // albeit degenerating to a spin loop.
4900 //
4901 // In a sense, park()-unpark() just provides more polite spinning
4902 // and polling with the key difference over naive spinning being
4903 // that a parked thread needs to be explicitly unparked() in order
4904 // to wake up and to poll the underlying condition.
4905 //
4906 // Assumption:
4907 // Only one parker can exist on an event, which is why we allocate
4908 // them per-thread. Multiple unparkers can coexist.
4909 //
4910 // _Event transitions in park()
4911 // -1 => -1 : illegal
4912 // 1 => 0 : pass - return immediately
4913 // 0 => -1 : block; then set _Event to 0 before returning
4914 //
4915 // _Event transitions in unpark()
4916 // 0 => 1 : just return
4917 // 1 => 1 : just return
4918 // -1 => either 0 or 1; must signal target thread
4919 // That is, we can safely transition _Event from -1 to either
4920 // 0 or 1.
4921 //
4922 // _Event serves as a restricted-range semaphore.
4923 // -1 : thread is blocked, i.e. there is a waiter
4924 // 0 : neutral: thread is running or ready,
4925 // could have been signaled after a wait started
4926 // 1 : signaled - thread is running or ready
4927 //
4928 // Another possible encoding of _Event would be with
4929 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4930 //
4931 // TODO-FIXME: add DTRACE probes for:
4932 // 1. Tx parks
4933 // 2. Ty unparks Tx
4934 // 3. Tx resumes from park
4935
4936
4937 // value determined through experimentation
4938 #define ROUNDINGFIX 11
4939
4940 // utility to compute the abstime argument to timedwait.
4941 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4942
4943 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4944 // millis is the relative timeout time
4945 // abstime will be the absolute timeout time
4946 if (millis < 0) millis = 0;
4947 struct timeval now;
4948 int status = gettimeofday(&now, NULL);
4949 assert(status == 0, "gettimeofday");
4950 jlong seconds = millis / 1000;
4951 jlong max_wait_period;
4952
4953 if (UseLWPSynchronization) {
4954 // forward port of fix for 4275818 (not sleeping long enough)
4955 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
4956 // _lwp_cond_timedwait() used a round_down algorithm rather
4957 // than a round_up. For millis less than our roundfactor
4958 // it rounded down to 0 which doesn't meet the spec.
4959 // For millis > roundfactor we may return a bit sooner, but
4960 // since we can not accurately identify the patch level and
4961 // this has already been fixed in Solaris 9 and 8 we will
4962 // leave it alone rather than always rounding down.
4963
4964 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
4965 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
4966 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
4967 max_wait_period = 21000000;
4968 } else {
4969 max_wait_period = 50000000;
4970 }
4971 millis %= 1000;
4972 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
4973 seconds = max_wait_period;
4974 }
4975 abstime->tv_sec = now.tv_sec + seconds;
4976 long usec = now.tv_usec + millis * 1000;
4977 if (usec >= 1000000) {
4978 abstime->tv_sec += 1;
4979 usec -= 1000000;
4980 }
4981 abstime->tv_nsec = usec * 1000;
4982 return abstime;
4983 }
4984
4985 void os::PlatformEvent::park() { // AKA: down()
4986 // Transitions for _Event:
4987 // -1 => -1 : illegal
4988 // 1 => 0 : pass - return immediately
4989 // 0 => -1 : block; then set _Event to 0 before returning
4990
4991 // Invariant: Only the thread associated with the Event/PlatformEvent
4992 // may call park().
4993 assert(_nParked == 0, "invariant");
4994
4995 int v;
4996 for (;;) {
4997 v = _Event;
4998 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4999 }
5000 guarantee(v >= 0, "invariant");
5001 if (v == 0) {
5002 // Do this the hard way by blocking ...
5003 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5004 int status = os::Solaris::mutex_lock(_mutex);
5005 assert_status(status == 0, status, "mutex_lock");
5006 guarantee(_nParked == 0, "invariant");
5007 ++_nParked;
5008 while (_Event < 0) {
5009 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5010 // Treat this the same as if the wait was interrupted
5011 // With usr/lib/lwp going to kernel, always handle ETIME
5012 status = os::Solaris::cond_wait(_cond, _mutex);
5013 if (status == ETIME) status = EINTR;
5014 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5015 }
5016 --_nParked;
5017 _Event = 0;
5018 status = os::Solaris::mutex_unlock(_mutex);
5019 assert_status(status == 0, status, "mutex_unlock");
5020 // Paranoia to ensure our locked and lock-free paths interact
5021 // correctly with each other.
5022 OrderAccess::fence();
5023 }
5024 }
5025
5026 int os::PlatformEvent::park(jlong millis) {
5027 // Transitions for _Event:
5028 // -1 => -1 : illegal
5029 // 1 => 0 : pass - return immediately
5030 // 0 => -1 : block; then set _Event to 0 before returning
5031
5032 guarantee(_nParked == 0, "invariant");
5033 int v;
5034 for (;;) {
5035 v = _Event;
5036 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5037 }
5038 guarantee(v >= 0, "invariant");
5039 if (v != 0) return OS_OK;
5040
5041 int ret = OS_TIMEOUT;
5042 timestruc_t abst;
5043 compute_abstime(&abst, millis);
5044
5045 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5046 int status = os::Solaris::mutex_lock(_mutex);
5047 assert_status(status == 0, status, "mutex_lock");
5048 guarantee(_nParked == 0, "invariant");
5049 ++_nParked;
5050 while (_Event < 0) {
5051 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5052 assert_status(status == 0 || status == EINTR ||
5053 status == ETIME || status == ETIMEDOUT,
5054 status, "cond_timedwait");
5055 if (!FilterSpuriousWakeups) break; // previous semantics
5056 if (status == ETIME || status == ETIMEDOUT) break;
5057 // We consume and ignore EINTR and spurious wakeups.
5058 }
5059 --_nParked;
5060 if (_Event >= 0) ret = OS_OK;
5061 _Event = 0;
5062 status = os::Solaris::mutex_unlock(_mutex);
5063 assert_status(status == 0, status, "mutex_unlock");
5064 // Paranoia to ensure our locked and lock-free paths interact
5065 // correctly with each other.
5066 OrderAccess::fence();
5067 return ret;
5068 }
5069
5070 void os::PlatformEvent::unpark() {
5071 // Transitions for _Event:
5072 // 0 => 1 : just return
5073 // 1 => 1 : just return
5074 // -1 => either 0 or 1; must signal target thread
5075 // That is, we can safely transition _Event from -1 to either
5076 // 0 or 1.
5077 // See also: "Semaphores in Plan 9" by Mullender & Cox
5078 //
5079 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5080 // that it will take two back-to-back park() calls for the owning
5081 // thread to block. This has the benefit of forcing a spurious return
5082 // from the first park() call after an unpark() call which will help
5083 // shake out uses of park() and unpark() without condition variables.
5084
5085 if (Atomic::xchg(1, &_Event) >= 0) return;
5086
5087 // If the thread associated with the event was parked, wake it.
5088 // Wait for the thread assoc with the PlatformEvent to vacate.
5089 int status = os::Solaris::mutex_lock(_mutex);
5090 assert_status(status == 0, status, "mutex_lock");
5091 int AnyWaiters = _nParked;
5092 status = os::Solaris::mutex_unlock(_mutex);
5093 assert_status(status == 0, status, "mutex_unlock");
5094 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5095 if (AnyWaiters != 0) {
5096 // Note that we signal() *after* dropping the lock for "immortal" Events.
5097 // This is safe and avoids a common class of futile wakeups. In rare
5098 // circumstances this can cause a thread to return prematurely from
5099 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5100 // will simply re-test the condition and re-park itself.
5101 // This provides particular benefit if the underlying platform does not
5102 // provide wait morphing.
5103 status = os::Solaris::cond_signal(_cond);
5104 assert_status(status == 0, status, "cond_signal");
5105 }
5106 }
5107
5108 // JSR166
5109 // -------------------------------------------------------
5110
5111 // The solaris and linux implementations of park/unpark are fairly
5112 // conservative for now, but can be improved. They currently use a
5113 // mutex/condvar pair, plus _counter.
5114 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5115 // sets count to 1 and signals condvar. Only one thread ever waits
5116 // on the condvar. Contention seen when trying to park implies that someone
5117 // is unparking you, so don't wait. And spurious returns are fine, so there
5118 // is no need to track notifications.
5119
5120 #define MAX_SECS 100000000
5121
5122 // This code is common to linux and solaris and will be moved to a
5123 // common place in dolphin.
5124 //
5125 // The passed in time value is either a relative time in nanoseconds
5126 // or an absolute time in milliseconds. Either way it has to be unpacked
5127 // into suitable seconds and nanoseconds components and stored in the
5128 // given timespec structure.
5129 // Given time is a 64-bit value and the time_t used in the timespec is only
5130 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5131 // overflow if times way in the future are given. Further on Solaris versions
5132 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5133 // number of seconds, in abstime, is less than current_time + 100,000,000.
5134 // As it will be 28 years before "now + 100000000" will overflow we can
5135 // ignore overflow and just impose a hard-limit on seconds using the value
5136 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5137 // years from "now".
5138 //
5139 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5140 assert(time > 0, "convertTime");
5141
5142 struct timeval now;
5143 int status = gettimeofday(&now, NULL);
5144 assert(status == 0, "gettimeofday");
5145
5146 time_t max_secs = now.tv_sec + MAX_SECS;
5147
5148 if (isAbsolute) {
5149 jlong secs = time / 1000;
5150 if (secs > max_secs) {
5151 absTime->tv_sec = max_secs;
5152 } else {
5153 absTime->tv_sec = secs;
5154 }
5155 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5156 } else {
5157 jlong secs = time / NANOSECS_PER_SEC;
5158 if (secs >= MAX_SECS) {
5159 absTime->tv_sec = max_secs;
5160 absTime->tv_nsec = 0;
5161 } else {
5162 absTime->tv_sec = now.tv_sec + secs;
5163 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5164 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5165 absTime->tv_nsec -= NANOSECS_PER_SEC;
5166 ++absTime->tv_sec; // note: this must be <= max_secs
5167 }
5168 }
5169 }
5170 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5171 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5172 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5173 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5174 }
5175
5176 void Parker::park(bool isAbsolute, jlong time) {
5177 // Ideally we'd do something useful while spinning, such
5178 // as calling unpackTime().
5179
5180 // Optional fast-path check:
5181 // Return immediately if a permit is available.
5182 // We depend on Atomic::xchg() having full barrier semantics
5183 // since we are doing a lock-free update to _counter.
5184 if (Atomic::xchg(0, &_counter) > 0) return;
5185
5186 // Optional fast-exit: Check interrupt before trying to wait
5187 Thread* thread = Thread::current();
5188 assert(thread->is_Java_thread(), "Must be JavaThread");
5189 JavaThread *jt = (JavaThread *)thread;
5190 if (Thread::is_interrupted(thread, false)) {
5191 return;
5192 }
5193
5194 // First, demultiplex/decode time arguments
5195 timespec absTime;
5196 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5197 return;
5198 }
5199 if (time > 0) {
5200 // Warning: this code might be exposed to the old Solaris time
5201 // round-down bugs. Grep "roundingFix" for details.
5202 unpackTime(&absTime, isAbsolute, time);
5203 }
5204
5205 // Enter safepoint region
5206 // Beware of deadlocks such as 6317397.
5207 // The per-thread Parker:: _mutex is a classic leaf-lock.
5208 // In particular a thread must never block on the Threads_lock while
5209 // holding the Parker:: mutex. If safepoints are pending both the
5210 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5211 ThreadBlockInVM tbivm(jt);
5212
5213 // Don't wait if cannot get lock since interference arises from
5214 // unblocking. Also. check interrupt before trying wait
5215 if (Thread::is_interrupted(thread, false) ||
5216 os::Solaris::mutex_trylock(_mutex) != 0) {
5217 return;
5218 }
5219
5220 int status;
5221
5222 if (_counter > 0) { // no wait needed
5223 _counter = 0;
5224 status = os::Solaris::mutex_unlock(_mutex);
5225 assert(status == 0, "invariant");
5226 // Paranoia to ensure our locked and lock-free paths interact
5227 // correctly with each other and Java-level accesses.
5228 OrderAccess::fence();
5229 return;
5230 }
5231
5232 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5233 jt->set_suspend_equivalent();
5234 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5235
5236 // Do this the hard way by blocking ...
5237 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5238 if (time == 0) {
5239 status = os::Solaris::cond_wait(_cond, _mutex);
5240 } else {
5241 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5242 }
5243 // Note that an untimed cond_wait() can sometimes return ETIME on older
5244 // versions of the Solaris.
5245 assert_status(status == 0 || status == EINTR ||
5246 status == ETIME || status == ETIMEDOUT,
5247 status, "cond_timedwait");
5248
5249 _counter = 0;
5250 status = os::Solaris::mutex_unlock(_mutex);
5251 assert_status(status == 0, status, "mutex_unlock");
5252 // Paranoia to ensure our locked and lock-free paths interact
5253 // correctly with each other and Java-level accesses.
5254 OrderAccess::fence();
5255
5256 // If externally suspended while waiting, re-suspend
5257 if (jt->handle_special_suspend_equivalent_condition()) {
5258 jt->java_suspend_self();
5259 }
5260 }
5261
5262 void Parker::unpark() {
5263 int status = os::Solaris::mutex_lock(_mutex);
5264 assert(status == 0, "invariant");
5265 const int s = _counter;
5266 _counter = 1;
5267 status = os::Solaris::mutex_unlock(_mutex);
5268 assert(status == 0, "invariant");
5269
5270 if (s < 1) {
5271 status = os::Solaris::cond_signal(_cond);
5272 assert(status == 0, "invariant");
5273 }
5274 }
5275
5276 extern char** environ;
5277
5278 // Run the specified command in a separate process. Return its exit value,
5279 // or -1 on failure (e.g. can't fork a new process).
5280 // Unlike system(), this function can be called from signal handler. It
5281 // doesn't block SIGINT et al.
5282 int os::fork_and_exec(char* cmd) {
5283 char * argv[4];
5284 argv[0] = (char *)"sh";
5285 argv[1] = (char *)"-c";
5286 argv[2] = cmd;
5287 argv[3] = NULL;
5288
5289 // fork is async-safe, fork1 is not so can't use in signal handler
5290 pid_t pid;
5291 Thread* t = Thread::current_or_null_safe();
5292 if (t != NULL && t->is_inside_signal_handler()) {
5293 pid = fork();
5294 } else {
5295 pid = fork1();
5296 }
5297
5298 if (pid < 0) {
5299 // fork failed
5300 warning("fork failed: %s", os::strerror(errno));
5301 return -1;
5302
5303 } else if (pid == 0) {
5304 // child process
5305
5306 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5307 execve("/usr/bin/sh", argv, environ);
5308
5309 // execve failed
5310 _exit(-1);
5311
5312 } else {
5313 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5314 // care about the actual exit code, for now.
5315
5316 int status;
5317
5318 // Wait for the child process to exit. This returns immediately if
5319 // the child has already exited. */
5320 while (waitpid(pid, &status, 0) < 0) {
5321 switch (errno) {
5322 case ECHILD: return 0;
5323 case EINTR: break;
5324 default: return -1;
5325 }
5326 }
5327
5328 if (WIFEXITED(status)) {
5329 // The child exited normally; get its exit code.
5330 return WEXITSTATUS(status);
5331 } else if (WIFSIGNALED(status)) {
5332 // The child exited because of a signal
5333 // The best value to return is 0x80 + signal number,
5334 // because that is what all Unix shells do, and because
5335 // it allows callers to distinguish between process exit and
5336 // process death by signal.
5337 return 0x80 + WTERMSIG(status);
5338 } else {
5339 // Unknown exit code; pass it through
5340 return status;
5341 }
5342 }
5343 }
5344
5345 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5346 size_t res;
5347 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5348 return res;
5349 }
5350
5351 int os::close(int fd) {
5352 return ::close(fd);
5353 }
5354
5355 int os::socket_close(int fd) {
5356 return ::close(fd);
5357 }
5358
5359 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5360 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5361 "Assumed _thread_in_native");
5362 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5363 }
5364
5365 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5366 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5367 "Assumed _thread_in_native");
5368 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5369 }
5370
5371 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5372 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5373 }
5374
5375 // As both poll and select can be interrupted by signals, we have to be
5376 // prepared to restart the system call after updating the timeout, unless
5377 // a poll() is done with timeout == -1, in which case we repeat with this
5378 // "wait forever" value.
5379
5380 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5381 int _result;
5382 _result = ::connect(fd, him, len);
5383
5384 // On Solaris, when a connect() call is interrupted, the connection
5385 // can be established asynchronously (see 6343810). Subsequent calls
5386 // to connect() must check the errno value which has the semantic
5387 // described below (copied from the connect() man page). Handling
5388 // of asynchronously established connections is required for both
5389 // blocking and non-blocking sockets.
5390 // EINTR The connection attempt was interrupted
5391 // before any data arrived by the delivery of
5392 // a signal. The connection, however, will be
5393 // established asynchronously.
5394 //
5395 // EINPROGRESS The socket is non-blocking, and the connec-
5396 // tion cannot be completed immediately.
5397 //
5398 // EALREADY The socket is non-blocking, and a previous
5399 // connection attempt has not yet been com-
5400 // pleted.
5401 //
5402 // EISCONN The socket is already connected.
5403 if (_result == OS_ERR && errno == EINTR) {
5404 // restarting a connect() changes its errno semantics
5405 RESTARTABLE(::connect(fd, him, len), _result);
5406 // undo these changes
5407 if (_result == OS_ERR) {
5408 if (errno == EALREADY) {
5409 errno = EINPROGRESS; // fall through
5410 } else if (errno == EISCONN) {
5411 errno = 0;
5412 return OS_OK;
5413 }
5414 }
5415 }
5416 return _result;
5417 }
5418
5419 // Get the default path to the core file
5420 // Returns the length of the string
5421 int os::get_core_path(char* buffer, size_t bufferSize) {
5422 const char* p = get_current_directory(buffer, bufferSize);
5423
5424 if (p == NULL) {
5425 assert(p != NULL, "failed to get current directory");
5426 return 0;
5427 }
5428
5429 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5430 p, current_process_id());
5431
5432 return strlen(buffer);
5433 }
5434
5435 #ifndef PRODUCT
5436 void TestReserveMemorySpecial_test() {
5437 // No tests available for this platform
5438 }
5439 #endif
5440
5441 bool os::start_debugging(char *buf, int buflen) {
5442 int len = (int)strlen(buf);
5443 char *p = &buf[len];
5444
5445 jio_snprintf(p, buflen-len,
5446 "\n\n"
5447 "Do you want to debug the problem?\n\n"
5448 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5449 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5450 "Otherwise, press RETURN to abort...",
5451 os::current_process_id(), os::current_thread_id());
5452
5453 bool yes = os::message_box("Unexpected Error", buf);
5454
5455 if (yes) {
5456 // yes, user asked VM to launch debugger
5457 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5458
5459 os::fork_and_exec(buf);
5460 yes = false;
5461 }
5462 return yes;
5463 }