1 /* 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "interpreter/interpreter.hpp" 33 #include "jvm_bsd.h" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/filemap.hpp" 36 #include "mutex_bsd.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "os_share_bsd.hpp" 39 #include "prims/jniFastGetField.hpp" 40 #include "prims/jvm.h" 41 #include "prims/jvm_misc.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/extendedPC.hpp" 44 #include "runtime/globals.hpp" 45 #include "runtime/interfaceSupport.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/javaCalls.hpp" 48 #include "runtime/mutexLocker.hpp" 49 #include "runtime/objectMonitor.hpp" 50 #include "runtime/osThread.hpp" 51 #include "runtime/perfMemory.hpp" 52 #include "runtime/sharedRuntime.hpp" 53 #include "runtime/statSampler.hpp" 54 #include "runtime/stubRoutines.hpp" 55 #include "runtime/threadCritical.hpp" 56 #include "runtime/timer.hpp" 57 #include "services/attachListener.hpp" 58 #include "services/runtimeService.hpp" 59 #include "thread_bsd.inline.hpp" 60 #include "utilities/decoder.hpp" 61 #include "utilities/defaultStream.hpp" 62 #include "utilities/events.hpp" 63 #include "utilities/growableArray.hpp" 64 #include "utilities/vmError.hpp" 65 #ifdef TARGET_ARCH_x86 66 # include "assembler_x86.inline.hpp" 67 # include "nativeInst_x86.hpp" 68 #endif 69 #ifdef TARGET_ARCH_sparc 70 # include "assembler_sparc.inline.hpp" 71 # include "nativeInst_sparc.hpp" 72 #endif 73 #ifdef TARGET_ARCH_zero 74 # include "assembler_zero.inline.hpp" 75 # include "nativeInst_zero.hpp" 76 #endif 77 #ifdef TARGET_ARCH_arm 78 # include "assembler_arm.inline.hpp" 79 # include "nativeInst_arm.hpp" 80 #endif 81 #ifdef TARGET_ARCH_ppc 82 # include "assembler_ppc.inline.hpp" 83 # include "nativeInst_ppc.hpp" 84 #endif 85 #ifdef COMPILER1 86 #include "c1/c1_Runtime1.hpp" 87 #endif 88 #ifdef COMPILER2 89 #include "opto/runtime.hpp" 90 #endif 91 92 // put OS-includes here 93 # include <sys/types.h> 94 # include <sys/mman.h> 95 # include <sys/stat.h> 96 # include <sys/select.h> 97 # include <pthread.h> 98 # include <signal.h> 99 # include <errno.h> 100 # include <dlfcn.h> 101 # include <stdio.h> 102 # include <unistd.h> 103 # include <sys/resource.h> 104 # include <pthread.h> 105 # include <sys/stat.h> 106 # include <sys/time.h> 107 # include <sys/times.h> 108 # include <sys/utsname.h> 109 # include <sys/socket.h> 110 # include <sys/wait.h> 111 # include <time.h> 112 # include <pwd.h> 113 # include <poll.h> 114 # include <semaphore.h> 115 # include <fcntl.h> 116 # include <string.h> 117 #ifdef _ALLBSD_SOURCE 118 # include <sys/param.h> 119 # include <sys/sysctl.h> 120 #else 121 # include <syscall.h> 122 # include <sys/sysinfo.h> 123 # include <gnu/libc-version.h> 124 #endif 125 # include <sys/ipc.h> 126 # include <sys/shm.h> 127 #ifndef __APPLE__ 128 # include <link.h> 129 #endif 130 # include <stdint.h> 131 # include <inttypes.h> 132 # include <sys/ioctl.h> 133 134 #if defined(__FreeBSD__) || defined(__NetBSD__) 135 # include <elf.h> 136 #endif 137 138 #ifdef __APPLE__ 139 # include <mach/mach.h> // semaphore_* API 140 # include <mach-o/dyld.h> 141 # include <sys/proc_info.h> 142 # include <objc/objc-auto.h> 143 #endif 144 145 #ifndef MAP_ANONYMOUS 146 #define MAP_ANONYMOUS MAP_ANON 147 #endif 148 149 #define MAX_PATH (2 * K) 150 151 // for timer info max values which include all bits 152 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 153 154 #define LARGEPAGES_BIT (1 << 6) 155 //////////////////////////////////////////////////////////////////////////////// 156 // global variables 157 julong os::Bsd::_physical_memory = 0; 158 159 #ifndef _ALLBSD_SOURCE 160 address os::Bsd::_initial_thread_stack_bottom = NULL; 161 uintptr_t os::Bsd::_initial_thread_stack_size = 0; 162 #endif 163 164 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 165 #ifndef _ALLBSD_SOURCE 166 int (*os::Bsd::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; 167 Mutex* os::Bsd::_createThread_lock = NULL; 168 #endif 169 pthread_t os::Bsd::_main_thread; 170 int os::Bsd::_page_size = -1; 171 #ifndef _ALLBSD_SOURCE 172 bool os::Bsd::_is_floating_stack = false; 173 bool os::Bsd::_is_NPTL = false; 174 bool os::Bsd::_supports_fast_thread_cpu_time = false; 175 const char * os::Bsd::_glibc_version = NULL; 176 const char * os::Bsd::_libpthread_version = NULL; 177 #endif 178 179 static jlong initial_time_count=0; 180 181 static int clock_tics_per_sec = 100; 182 183 // For diagnostics to print a message once. see run_periodic_checks 184 static sigset_t check_signal_done; 185 static bool check_signals = true;; 186 187 static pid_t _initial_pid = 0; 188 189 /* Signal number used to suspend/resume a thread */ 190 191 /* do not use any signal number less than SIGSEGV, see 4355769 */ 192 static int SR_signum = SIGUSR2; 193 sigset_t SR_sigset; 194 195 196 //////////////////////////////////////////////////////////////////////////////// 197 // utility functions 198 199 static int SR_initialize(); 200 static int SR_finalize(); 201 202 julong os::available_memory() { 203 return Bsd::available_memory(); 204 } 205 206 julong os::Bsd::available_memory() { 207 #ifdef _ALLBSD_SOURCE 208 // XXXBSD: this is just a stopgap implementation 209 return physical_memory() >> 2; 210 #else 211 // values in struct sysinfo are "unsigned long" 212 struct sysinfo si; 213 sysinfo(&si); 214 215 return (julong)si.freeram * si.mem_unit; 216 #endif 217 } 218 219 julong os::physical_memory() { 220 return Bsd::physical_memory(); 221 } 222 223 julong os::allocatable_physical_memory(julong size) { 224 #ifdef _LP64 225 return size; 226 #else 227 julong result = MIN2(size, (julong)3800*M); 228 if (!is_allocatable(result)) { 229 // See comments under solaris for alignment considerations 230 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); 231 result = MIN2(size, reasonable_size); 232 } 233 return result; 234 #endif // _LP64 235 } 236 237 //////////////////////////////////////////////////////////////////////////////// 238 // environment support 239 240 bool os::getenv(const char* name, char* buf, int len) { 241 const char* val = ::getenv(name); 242 if (val != NULL && strlen(val) < (size_t)len) { 243 strcpy(buf, val); 244 return true; 245 } 246 if (len > 0) buf[0] = 0; // return a null string 247 return false; 248 } 249 250 251 // Return true if user is running as root. 252 253 bool os::have_special_privileges() { 254 static bool init = false; 255 static bool privileges = false; 256 if (!init) { 257 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 258 init = true; 259 } 260 return privileges; 261 } 262 263 264 #ifndef _ALLBSD_SOURCE 265 #ifndef SYS_gettid 266 // i386: 224, ia64: 1105, amd64: 186, sparc 143 267 #ifdef __ia64__ 268 #define SYS_gettid 1105 269 #elif __i386__ 270 #define SYS_gettid 224 271 #elif __amd64__ 272 #define SYS_gettid 186 273 #elif __sparc__ 274 #define SYS_gettid 143 275 #else 276 #error define gettid for the arch 277 #endif 278 #endif 279 #endif 280 281 // Cpu architecture string 282 #if defined(ZERO) 283 static char cpu_arch[] = ZERO_LIBARCH; 284 #elif defined(IA64) 285 static char cpu_arch[] = "ia64"; 286 #elif defined(IA32) 287 static char cpu_arch[] = "i386"; 288 #elif defined(AMD64) 289 static char cpu_arch[] = "amd64"; 290 #elif defined(ARM) 291 static char cpu_arch[] = "arm"; 292 #elif defined(PPC) 293 static char cpu_arch[] = "ppc"; 294 #elif defined(SPARC) 295 # ifdef _LP64 296 static char cpu_arch[] = "sparcv9"; 297 # else 298 static char cpu_arch[] = "sparc"; 299 # endif 300 #else 301 #error Add appropriate cpu_arch setting 302 #endif 303 304 305 #ifndef _ALLBSD_SOURCE 306 // pid_t gettid() 307 // 308 // Returns the kernel thread id of the currently running thread. Kernel 309 // thread id is used to access /proc. 310 // 311 // (Note that getpid() on BsdThreads returns kernel thread id too; but 312 // on NPTL, it returns the same pid for all threads, as required by POSIX.) 313 // 314 pid_t os::Bsd::gettid() { 315 int rslt = syscall(SYS_gettid); 316 if (rslt == -1) { 317 // old kernel, no NPTL support 318 return getpid(); 319 } else { 320 return (pid_t)rslt; 321 } 322 } 323 324 // Most versions of bsd have a bug where the number of processors are 325 // determined by looking at the /proc file system. In a chroot environment, 326 // the system call returns 1. This causes the VM to act as if it is 327 // a single processor and elide locking (see is_MP() call). 328 static bool unsafe_chroot_detected = false; 329 static const char *unstable_chroot_error = "/proc file system not found.\n" 330 "Java may be unstable running multithreaded in a chroot " 331 "environment on Bsd when /proc filesystem is not mounted."; 332 #endif 333 334 #ifdef _ALLBSD_SOURCE 335 void os::Bsd::initialize_system_info() { 336 int mib[2]; 337 size_t len; 338 int cpu_val; 339 u_long mem_val; 340 341 /* get processors count via hw.ncpus sysctl */ 342 mib[0] = CTL_HW; 343 mib[1] = HW_NCPU; 344 len = sizeof(cpu_val); 345 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 346 set_processor_count(cpu_val); 347 } 348 else { 349 set_processor_count(1); // fallback 350 } 351 352 /* get physical memory via hw.usermem sysctl (hw.usermem is used 353 * instead of hw.physmem because we need size of allocatable memory 354 */ 355 mib[0] = CTL_HW; 356 mib[1] = HW_USERMEM; 357 len = sizeof(mem_val); 358 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) 359 _physical_memory = mem_val; 360 else 361 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 362 363 #ifdef __OpenBSD__ 364 { 365 // limit _physical_memory memory view on OpenBSD since 366 // datasize rlimit restricts us anyway. 367 struct rlimit limits; 368 getrlimit(RLIMIT_DATA, &limits); 369 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 370 } 371 #endif 372 } 373 #else 374 void os::Bsd::initialize_system_info() { 375 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 376 if (processor_count() == 1) { 377 pid_t pid = os::Bsd::gettid(); 378 char fname[32]; 379 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); 380 FILE *fp = fopen(fname, "r"); 381 if (fp == NULL) { 382 unsafe_chroot_detected = true; 383 } else { 384 fclose(fp); 385 } 386 } 387 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 388 assert(processor_count() > 0, "bsd error"); 389 } 390 #endif 391 392 #ifdef __APPLE__ 393 static const char *get_home() { 394 const char *home_dir = ::getenv("HOME"); 395 if ((home_dir == NULL) || (*home_dir == '\0')) { 396 struct passwd *passwd_info = getpwuid(geteuid()); 397 if (passwd_info != NULL) { 398 home_dir = passwd_info->pw_dir; 399 } 400 } 401 402 return home_dir; 403 } 404 #endif 405 406 void os::init_system_properties_values() { 407 // char arch[12]; 408 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 409 410 // The next steps are taken in the product version: 411 // 412 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. 413 // This library should be located at: 414 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. 415 // 416 // If "/jre/lib/" appears at the right place in the path, then we 417 // assume libjvm[_g].so is installed in a JDK and we use this path. 418 // 419 // Otherwise exit with message: "Could not create the Java virtual machine." 420 // 421 // The following extra steps are taken in the debugging version: 422 // 423 // If "/jre/lib/" does NOT appear at the right place in the path 424 // instead of exit check for $JAVA_HOME environment variable. 425 // 426 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 427 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so 428 // it looks like libjvm[_g].so is installed there 429 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. 430 // 431 // Otherwise exit. 432 // 433 // Important note: if the location of libjvm.so changes this 434 // code needs to be changed accordingly. 435 436 // The next few definitions allow the code to be verbatim: 437 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n)) 438 #define getenv(n) ::getenv(n) 439 440 /* 441 * See ld(1): 442 * The linker uses the following search paths to locate required 443 * shared libraries: 444 * 1: ... 445 * ... 446 * 7: The default directories, normally /lib and /usr/lib. 447 */ 448 #ifndef DEFAULT_LIBPATH 449 #define DEFAULT_LIBPATH "/lib:/usr/lib" 450 #endif 451 452 #define EXTENSIONS_DIR "/lib/ext" 453 #define ENDORSED_DIR "/lib/endorsed" 454 #define REG_DIR "/usr/java/packages" 455 456 #ifdef __APPLE__ 457 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 458 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 459 const char *user_home_dir = get_home(); 460 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 461 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 462 sizeof(SYS_EXTENSIONS_DIRS); 463 #endif 464 465 { 466 /* sysclasspath, java_home, dll_dir */ 467 { 468 char *home_path; 469 char *dll_path; 470 char *pslash; 471 char buf[MAXPATHLEN]; 472 os::jvm_path(buf, sizeof(buf)); 473 474 // Found the full path to libjvm.so. 475 // Now cut the path to <java_home>/jre if we can. 476 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 477 pslash = strrchr(buf, '/'); 478 if (pslash != NULL) 479 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 480 dll_path = malloc(strlen(buf) + 1); 481 if (dll_path == NULL) 482 return; 483 strcpy(dll_path, buf); 484 Arguments::set_dll_dir(dll_path); 485 486 if (pslash != NULL) { 487 pslash = strrchr(buf, '/'); 488 if (pslash != NULL) { 489 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 490 #ifndef __APPLE__ 491 pslash = strrchr(buf, '/'); 492 if (pslash != NULL) 493 *pslash = '\0'; /* get rid of /lib */ 494 #endif 495 } 496 } 497 498 home_path = malloc(strlen(buf) + 1); 499 if (home_path == NULL) 500 return; 501 strcpy(home_path, buf); 502 Arguments::set_java_home(home_path); 503 504 if (!set_boot_path('/', ':')) 505 return; 506 } 507 508 /* 509 * Where to look for native libraries 510 * 511 * Note: Due to a legacy implementation, most of the library path 512 * is set in the launcher. This was to accomodate linking restrictions 513 * on legacy Bsd implementations (which are no longer supported). 514 * Eventually, all the library path setting will be done here. 515 * 516 * However, to prevent the proliferation of improperly built native 517 * libraries, the new path component /usr/java/packages is added here. 518 * Eventually, all the library path setting will be done here. 519 */ 520 { 521 char *ld_library_path; 522 523 /* 524 * Construct the invariant part of ld_library_path. Note that the 525 * space for the colon and the trailing null are provided by the 526 * nulls included by the sizeof operator (so actually we allocate 527 * a byte more than necessary). 528 */ 529 #ifdef __APPLE__ 530 ld_library_path = (char *) malloc(system_ext_size); 531 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 532 #else 533 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 534 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 535 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 536 #endif 537 538 /* 539 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 540 * should always exist (until the legacy problem cited above is 541 * addressed). 542 */ 543 #ifdef __APPLE__ 544 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 545 char *l = getenv("JAVA_LIBRARY_PATH"); 546 if (l != NULL) { 547 char *t = ld_library_path; 548 /* That's +1 for the colon and +1 for the trailing '\0' */ 549 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 550 sprintf(ld_library_path, "%s:%s", l, t); 551 free(t); 552 } 553 554 char *v = getenv("DYLD_LIBRARY_PATH"); 555 #else 556 char *v = getenv("LD_LIBRARY_PATH"); 557 #endif 558 if (v != NULL) { 559 char *t = ld_library_path; 560 /* That's +1 for the colon and +1 for the trailing '\0' */ 561 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 562 sprintf(ld_library_path, "%s:%s", v, t); 563 free(t); 564 } 565 Arguments::set_library_path(ld_library_path); 566 } 567 568 /* 569 * Extensions directories. 570 * 571 * Note that the space for the colon and the trailing null are provided 572 * by the nulls included by the sizeof operator (so actually one byte more 573 * than necessary is allocated). 574 */ 575 { 576 #ifdef __APPLE__ 577 char *buf = malloc(strlen(Arguments::get_java_home()) + 578 sizeof(EXTENSIONS_DIR) + system_ext_size); 579 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 580 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 581 #else 582 char *buf = malloc(strlen(Arguments::get_java_home()) + 583 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 584 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 585 Arguments::get_java_home()); 586 #endif 587 588 Arguments::set_ext_dirs(buf); 589 } 590 591 /* Endorsed standards default directory. */ 592 { 593 char * buf; 594 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 595 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 596 Arguments::set_endorsed_dirs(buf); 597 } 598 } 599 600 #ifdef __APPLE__ 601 #undef SYS_EXTENSIONS_DIR 602 #endif 603 #undef malloc 604 #undef getenv 605 #undef EXTENSIONS_DIR 606 #undef ENDORSED_DIR 607 608 // Done 609 return; 610 } 611 612 //////////////////////////////////////////////////////////////////////////////// 613 // breakpoint support 614 615 void os::breakpoint() { 616 BREAKPOINT; 617 } 618 619 extern "C" void breakpoint() { 620 // use debugger to set breakpoint here 621 } 622 623 //////////////////////////////////////////////////////////////////////////////// 624 // signal support 625 626 debug_only(static bool signal_sets_initialized = false); 627 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 628 629 bool os::Bsd::is_sig_ignored(int sig) { 630 struct sigaction oact; 631 sigaction(sig, (struct sigaction*)NULL, &oact); 632 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 633 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 634 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 635 return true; 636 else 637 return false; 638 } 639 640 void os::Bsd::signal_sets_init() { 641 // Should also have an assertion stating we are still single-threaded. 642 assert(!signal_sets_initialized, "Already initialized"); 643 // Fill in signals that are necessarily unblocked for all threads in 644 // the VM. Currently, we unblock the following signals: 645 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 646 // by -Xrs (=ReduceSignalUsage)); 647 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 648 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 649 // the dispositions or masks wrt these signals. 650 // Programs embedding the VM that want to use the above signals for their 651 // own purposes must, at this time, use the "-Xrs" option to prevent 652 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 653 // (See bug 4345157, and other related bugs). 654 // In reality, though, unblocking these signals is really a nop, since 655 // these signals are not blocked by default. 656 sigemptyset(&unblocked_sigs); 657 sigemptyset(&allowdebug_blocked_sigs); 658 sigaddset(&unblocked_sigs, SIGILL); 659 sigaddset(&unblocked_sigs, SIGSEGV); 660 sigaddset(&unblocked_sigs, SIGBUS); 661 sigaddset(&unblocked_sigs, SIGFPE); 662 sigaddset(&unblocked_sigs, SR_signum); 663 664 if (!ReduceSignalUsage) { 665 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 666 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 667 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 668 } 669 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 670 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 671 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 672 } 673 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 674 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 675 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 676 } 677 } 678 // Fill in signals that are blocked by all but the VM thread. 679 sigemptyset(&vm_sigs); 680 if (!ReduceSignalUsage) 681 sigaddset(&vm_sigs, BREAK_SIGNAL); 682 debug_only(signal_sets_initialized = true); 683 684 } 685 686 // These are signals that are unblocked while a thread is running Java. 687 // (For some reason, they get blocked by default.) 688 sigset_t* os::Bsd::unblocked_signals() { 689 assert(signal_sets_initialized, "Not initialized"); 690 return &unblocked_sigs; 691 } 692 693 // These are the signals that are blocked while a (non-VM) thread is 694 // running Java. Only the VM thread handles these signals. 695 sigset_t* os::Bsd::vm_signals() { 696 assert(signal_sets_initialized, "Not initialized"); 697 return &vm_sigs; 698 } 699 700 // These are signals that are blocked during cond_wait to allow debugger in 701 sigset_t* os::Bsd::allowdebug_blocked_signals() { 702 assert(signal_sets_initialized, "Not initialized"); 703 return &allowdebug_blocked_sigs; 704 } 705 706 void os::Bsd::hotspot_sigmask(Thread* thread) { 707 708 //Save caller's signal mask before setting VM signal mask 709 sigset_t caller_sigmask; 710 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 711 712 OSThread* osthread = thread->osthread(); 713 osthread->set_caller_sigmask(caller_sigmask); 714 715 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 716 717 if (!ReduceSignalUsage) { 718 if (thread->is_VM_thread()) { 719 // Only the VM thread handles BREAK_SIGNAL ... 720 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 721 } else { 722 // ... all other threads block BREAK_SIGNAL 723 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 724 } 725 } 726 } 727 728 #ifndef _ALLBSD_SOURCE 729 ////////////////////////////////////////////////////////////////////////////// 730 // detecting pthread library 731 732 void os::Bsd::libpthread_init() { 733 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION 734 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a 735 // generic name for earlier versions. 736 // Define macros here so we can build HotSpot on old systems. 737 # ifndef _CS_GNU_LIBC_VERSION 738 # define _CS_GNU_LIBC_VERSION 2 739 # endif 740 # ifndef _CS_GNU_LIBPTHREAD_VERSION 741 # define _CS_GNU_LIBPTHREAD_VERSION 3 742 # endif 743 744 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); 745 if (n > 0) { 746 char *str = (char *)malloc(n); 747 confstr(_CS_GNU_LIBC_VERSION, str, n); 748 os::Bsd::set_glibc_version(str); 749 } else { 750 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() 751 static char _gnu_libc_version[32]; 752 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), 753 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); 754 os::Bsd::set_glibc_version(_gnu_libc_version); 755 } 756 757 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); 758 if (n > 0) { 759 char *str = (char *)malloc(n); 760 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); 761 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells 762 // us "NPTL-0.29" even we are running with BsdThreads. Check if this 763 // is the case. BsdThreads has a hard limit on max number of threads. 764 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. 765 // On the other hand, NPTL does not have such a limit, sysconf() 766 // will return -1 and errno is not changed. Check if it is really NPTL. 767 if (strcmp(os::Bsd::glibc_version(), "glibc 2.3.2") == 0 && 768 strstr(str, "NPTL") && 769 sysconf(_SC_THREAD_THREADS_MAX) > 0) { 770 free(str); 771 os::Bsd::set_libpthread_version("bsdthreads"); 772 } else { 773 os::Bsd::set_libpthread_version(str); 774 } 775 } else { 776 // glibc before 2.3.2 only has BsdThreads. 777 os::Bsd::set_libpthread_version("bsdthreads"); 778 } 779 780 if (strstr(libpthread_version(), "NPTL")) { 781 os::Bsd::set_is_NPTL(); 782 } else { 783 os::Bsd::set_is_BsdThreads(); 784 } 785 786 // BsdThreads have two flavors: floating-stack mode, which allows variable 787 // stack size; and fixed-stack mode. NPTL is always floating-stack. 788 if (os::Bsd::is_NPTL() || os::Bsd::supports_variable_stack_size()) { 789 os::Bsd::set_is_floating_stack(); 790 } 791 } 792 793 ///////////////////////////////////////////////////////////////////////////// 794 // thread stack 795 796 // Force Bsd kernel to expand current thread stack. If "bottom" is close 797 // to the stack guard, caller should block all signals. 798 // 799 // MAP_GROWSDOWN: 800 // A special mmap() flag that is used to implement thread stacks. It tells 801 // kernel that the memory region should extend downwards when needed. This 802 // allows early versions of BsdThreads to only mmap the first few pages 803 // when creating a new thread. Bsd kernel will automatically expand thread 804 // stack as needed (on page faults). 805 // 806 // However, because the memory region of a MAP_GROWSDOWN stack can grow on 807 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN 808 // region, it's hard to tell if the fault is due to a legitimate stack 809 // access or because of reading/writing non-exist memory (e.g. buffer 810 // overrun). As a rule, if the fault happens below current stack pointer, 811 // Bsd kernel does not expand stack, instead a SIGSEGV is sent to the 812 // application (see Bsd kernel fault.c). 813 // 814 // This Bsd feature can cause SIGSEGV when VM bangs thread stack for 815 // stack overflow detection. 816 // 817 // Newer version of BsdThreads (since glibc-2.2, or, RH-7.x) and NPTL do 818 // not use this flag. However, the stack of initial thread is not created 819 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though 820 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack 821 // and then attach the thread to JVM. 822 // 823 // To get around the problem and allow stack banging on Bsd, we need to 824 // manually expand thread stack after receiving the SIGSEGV. 825 // 826 // There are two ways to expand thread stack to address "bottom", we used 827 // both of them in JVM before 1.5: 828 // 1. adjust stack pointer first so that it is below "bottom", and then 829 // touch "bottom" 830 // 2. mmap() the page in question 831 // 832 // Now alternate signal stack is gone, it's harder to use 2. For instance, 833 // if current sp is already near the lower end of page 101, and we need to 834 // call mmap() to map page 100, it is possible that part of the mmap() frame 835 // will be placed in page 100. When page 100 is mapped, it is zero-filled. 836 // That will destroy the mmap() frame and cause VM to crash. 837 // 838 // The following code works by adjusting sp first, then accessing the "bottom" 839 // page to force a page fault. Bsd kernel will then automatically expand the 840 // stack mapping. 841 // 842 // _expand_stack_to() assumes its frame size is less than page size, which 843 // should always be true if the function is not inlined. 844 845 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute 846 #define NOINLINE 847 #else 848 #define NOINLINE __attribute__ ((noinline)) 849 #endif 850 851 static void _expand_stack_to(address bottom) NOINLINE; 852 853 static void _expand_stack_to(address bottom) { 854 address sp; 855 size_t size; 856 volatile char *p; 857 858 // Adjust bottom to point to the largest address within the same page, it 859 // gives us a one-page buffer if alloca() allocates slightly more memory. 860 bottom = (address)align_size_down((uintptr_t)bottom, os::Bsd::page_size()); 861 bottom += os::Bsd::page_size() - 1; 862 863 // sp might be slightly above current stack pointer; if that's the case, we 864 // will alloca() a little more space than necessary, which is OK. Don't use 865 // os::current_stack_pointer(), as its result can be slightly below current 866 // stack pointer, causing us to not alloca enough to reach "bottom". 867 sp = (address)&sp; 868 869 if (sp > bottom) { 870 size = sp - bottom; 871 p = (volatile char *)alloca(size); 872 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); 873 p[0] = '\0'; 874 } 875 } 876 877 bool os::Bsd::manually_expand_stack(JavaThread * t, address addr) { 878 assert(t!=NULL, "just checking"); 879 assert(t->osthread()->expanding_stack(), "expand should be set"); 880 assert(t->stack_base() != NULL, "stack_base was not initialized"); 881 882 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { 883 sigset_t mask_all, old_sigset; 884 sigfillset(&mask_all); 885 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); 886 _expand_stack_to(addr); 887 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); 888 return true; 889 } 890 return false; 891 } 892 #endif 893 894 ////////////////////////////////////////////////////////////////////////////// 895 // create new thread 896 897 static address highest_vm_reserved_address(); 898 899 // check if it's safe to start a new thread 900 static bool _thread_safety_check(Thread* thread) { 901 #ifdef _ALLBSD_SOURCE 902 return true; 903 #else 904 if (os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack()) { 905 // Fixed stack BsdThreads (SuSE Bsd/x86, and some versions of Redhat) 906 // Heap is mmap'ed at lower end of memory space. Thread stacks are 907 // allocated (MAP_FIXED) from high address space. Every thread stack 908 // occupies a fixed size slot (usually 2Mbytes, but user can change 909 // it to other values if they rebuild BsdThreads). 910 // 911 // Problem with MAP_FIXED is that mmap() can still succeed even part of 912 // the memory region has already been mmap'ed. That means if we have too 913 // many threads and/or very large heap, eventually thread stack will 914 // collide with heap. 915 // 916 // Here we try to prevent heap/stack collision by comparing current 917 // stack bottom with the highest address that has been mmap'ed by JVM 918 // plus a safety margin for memory maps created by native code. 919 // 920 // This feature can be disabled by setting ThreadSafetyMargin to 0 921 // 922 if (ThreadSafetyMargin > 0) { 923 address stack_bottom = os::current_stack_base() - os::current_stack_size(); 924 925 // not safe if our stack extends below the safety margin 926 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); 927 } else { 928 return true; 929 } 930 } else { 931 // Floating stack BsdThreads or NPTL: 932 // Unlike fixed stack BsdThreads, thread stacks are not MAP_FIXED. When 933 // there's not enough space left, pthread_create() will fail. If we come 934 // here, that means enough space has been reserved for stack. 935 return true; 936 } 937 #endif 938 } 939 940 #ifdef __APPLE__ 941 // library handle for calling objc_registerThreadWithCollector() 942 // without static linking to the libobjc library 943 #define OBJC_LIB "/usr/lib/libobjc.dylib" 944 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 945 typedef void (*objc_registerThreadWithCollector_t)(); 946 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 947 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 948 #endif 949 950 // Thread start routine for all newly created threads 951 static void *java_start(Thread *thread) { 952 // Try to randomize the cache line index of hot stack frames. 953 // This helps when threads of the same stack traces evict each other's 954 // cache lines. The threads can be either from the same JVM instance, or 955 // from different JVM instances. The benefit is especially true for 956 // processors with hyperthreading technology. 957 static int counter = 0; 958 int pid = os::current_process_id(); 959 alloca(((pid ^ counter++) & 7) * 128); 960 961 ThreadLocalStorage::set_thread(thread); 962 963 OSThread* osthread = thread->osthread(); 964 Monitor* sync = osthread->startThread_lock(); 965 966 // non floating stack BsdThreads needs extra check, see above 967 if (!_thread_safety_check(thread)) { 968 // notify parent thread 969 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 970 osthread->set_state(ZOMBIE); 971 sync->notify_all(); 972 return NULL; 973 } 974 975 #ifdef _ALLBSD_SOURCE 976 // thread_id is pthread_id on BSD 977 osthread->set_thread_id(::pthread_self()); 978 #else 979 // thread_id is kernel thread id (similar to Solaris LWP id) 980 osthread->set_thread_id(os::Bsd::gettid()); 981 982 if (UseNUMA) { 983 int lgrp_id = os::numa_get_group_id(); 984 if (lgrp_id != -1) { 985 thread->set_lgrp_id(lgrp_id); 986 } 987 } 988 #endif 989 // initialize signal mask for this thread 990 os::Bsd::hotspot_sigmask(thread); 991 992 // initialize floating point control register 993 os::Bsd::init_thread_fpu_state(); 994 995 #ifdef __APPLE__ 996 // register thread with objc gc 997 if (objc_registerThreadWithCollectorFunction != NULL) { 998 objc_registerThreadWithCollectorFunction(); 999 } 1000 #endif 1001 1002 // handshaking with parent thread 1003 { 1004 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 1005 1006 // notify parent thread 1007 osthread->set_state(INITIALIZED); 1008 sync->notify_all(); 1009 1010 // wait until os::start_thread() 1011 while (osthread->get_state() == INITIALIZED) { 1012 sync->wait(Mutex::_no_safepoint_check_flag); 1013 } 1014 } 1015 1016 // call one more level start routine 1017 thread->run(); 1018 1019 return 0; 1020 } 1021 1022 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1023 assert(thread->osthread() == NULL, "caller responsible"); 1024 1025 // Allocate the OSThread object 1026 OSThread* osthread = new OSThread(NULL, NULL); 1027 if (osthread == NULL) { 1028 return false; 1029 } 1030 1031 // set the correct thread state 1032 osthread->set_thread_type(thr_type); 1033 1034 // Initial state is ALLOCATED but not INITIALIZED 1035 osthread->set_state(ALLOCATED); 1036 1037 thread->set_osthread(osthread); 1038 1039 // init thread attributes 1040 pthread_attr_t attr; 1041 pthread_attr_init(&attr); 1042 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 1043 1044 // stack size 1045 if (os::Bsd::supports_variable_stack_size()) { 1046 // calculate stack size if it's not specified by caller 1047 if (stack_size == 0) { 1048 stack_size = os::Bsd::default_stack_size(thr_type); 1049 1050 switch (thr_type) { 1051 case os::java_thread: 1052 // Java threads use ThreadStackSize which default value can be 1053 // changed with the flag -Xss 1054 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 1055 stack_size = JavaThread::stack_size_at_create(); 1056 break; 1057 case os::compiler_thread: 1058 if (CompilerThreadStackSize > 0) { 1059 stack_size = (size_t)(CompilerThreadStackSize * K); 1060 break; 1061 } // else fall through: 1062 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1063 case os::vm_thread: 1064 case os::pgc_thread: 1065 case os::cgc_thread: 1066 case os::watcher_thread: 1067 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1068 break; 1069 } 1070 } 1071 1072 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 1073 pthread_attr_setstacksize(&attr, stack_size); 1074 } else { 1075 // let pthread_create() pick the default value. 1076 } 1077 1078 #ifndef _ALLBSD_SOURCE 1079 // glibc guard page 1080 pthread_attr_setguardsize(&attr, os::Bsd::default_guard_size(thr_type)); 1081 #endif 1082 1083 ThreadState state; 1084 1085 { 1086 1087 #ifndef _ALLBSD_SOURCE 1088 // Serialize thread creation if we are running with fixed stack BsdThreads 1089 bool lock = os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack(); 1090 if (lock) { 1091 os::Bsd::createThread_lock()->lock_without_safepoint_check(); 1092 } 1093 #endif 1094 1095 pthread_t tid; 1096 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 1097 1098 pthread_attr_destroy(&attr); 1099 1100 if (ret != 0) { 1101 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1102 perror("pthread_create()"); 1103 } 1104 // Need to clean up stuff we've allocated so far 1105 thread->set_osthread(NULL); 1106 delete osthread; 1107 #ifndef _ALLBSD_SOURCE 1108 if (lock) os::Bsd::createThread_lock()->unlock(); 1109 #endif 1110 return false; 1111 } 1112 1113 // Store pthread info into the OSThread 1114 osthread->set_pthread_id(tid); 1115 1116 // Wait until child thread is either initialized or aborted 1117 { 1118 Monitor* sync_with_child = osthread->startThread_lock(); 1119 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 1120 while ((state = osthread->get_state()) == ALLOCATED) { 1121 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 1122 } 1123 } 1124 1125 #ifndef _ALLBSD_SOURCE 1126 if (lock) { 1127 os::Bsd::createThread_lock()->unlock(); 1128 } 1129 #endif 1130 } 1131 1132 // Aborted due to thread limit being reached 1133 if (state == ZOMBIE) { 1134 thread->set_osthread(NULL); 1135 delete osthread; 1136 return false; 1137 } 1138 1139 // The thread is returned suspended (in state INITIALIZED), 1140 // and is started higher up in the call chain 1141 assert(state == INITIALIZED, "race condition"); 1142 return true; 1143 } 1144 1145 ///////////////////////////////////////////////////////////////////////////// 1146 // attach existing thread 1147 1148 // bootstrap the main thread 1149 bool os::create_main_thread(JavaThread* thread) { 1150 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 1151 return create_attached_thread(thread); 1152 } 1153 1154 bool os::create_attached_thread(JavaThread* thread) { 1155 #ifdef ASSERT 1156 thread->verify_not_published(); 1157 #endif 1158 1159 // Allocate the OSThread object 1160 OSThread* osthread = new OSThread(NULL, NULL); 1161 1162 if (osthread == NULL) { 1163 return false; 1164 } 1165 1166 // Store pthread info into the OSThread 1167 #ifdef _ALLBSD_SOURCE 1168 osthread->set_thread_id(::pthread_self()); 1169 #else 1170 osthread->set_thread_id(os::Bsd::gettid()); 1171 #endif 1172 osthread->set_pthread_id(::pthread_self()); 1173 1174 // initialize floating point control register 1175 os::Bsd::init_thread_fpu_state(); 1176 1177 // Initial thread state is RUNNABLE 1178 osthread->set_state(RUNNABLE); 1179 1180 thread->set_osthread(osthread); 1181 1182 #ifndef _ALLBSD_SOURCE 1183 if (UseNUMA) { 1184 int lgrp_id = os::numa_get_group_id(); 1185 if (lgrp_id != -1) { 1186 thread->set_lgrp_id(lgrp_id); 1187 } 1188 } 1189 1190 if (os::Bsd::is_initial_thread()) { 1191 // If current thread is initial thread, its stack is mapped on demand, 1192 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map 1193 // the entire stack region to avoid SEGV in stack banging. 1194 // It is also useful to get around the heap-stack-gap problem on SuSE 1195 // kernel (see 4821821 for details). We first expand stack to the top 1196 // of yellow zone, then enable stack yellow zone (order is significant, 1197 // enabling yellow zone first will crash JVM on SuSE Bsd), so there 1198 // is no gap between the last two virtual memory regions. 1199 1200 JavaThread *jt = (JavaThread *)thread; 1201 address addr = jt->stack_yellow_zone_base(); 1202 assert(addr != NULL, "initialization problem?"); 1203 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); 1204 1205 osthread->set_expanding_stack(); 1206 os::Bsd::manually_expand_stack(jt, addr); 1207 osthread->clear_expanding_stack(); 1208 } 1209 #endif 1210 1211 // initialize signal mask for this thread 1212 // and save the caller's signal mask 1213 os::Bsd::hotspot_sigmask(thread); 1214 1215 return true; 1216 } 1217 1218 void os::pd_start_thread(Thread* thread) { 1219 OSThread * osthread = thread->osthread(); 1220 assert(osthread->get_state() != INITIALIZED, "just checking"); 1221 Monitor* sync_with_child = osthread->startThread_lock(); 1222 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 1223 sync_with_child->notify(); 1224 } 1225 1226 // Free Bsd resources related to the OSThread 1227 void os::free_thread(OSThread* osthread) { 1228 assert(osthread != NULL, "osthread not set"); 1229 1230 if (Thread::current()->osthread() == osthread) { 1231 // Restore caller's signal mask 1232 sigset_t sigmask = osthread->caller_sigmask(); 1233 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1234 } 1235 1236 delete osthread; 1237 } 1238 1239 ////////////////////////////////////////////////////////////////////////////// 1240 // thread local storage 1241 1242 int os::allocate_thread_local_storage() { 1243 pthread_key_t key; 1244 int rslt = pthread_key_create(&key, NULL); 1245 assert(rslt == 0, "cannot allocate thread local storage"); 1246 return (int)key; 1247 } 1248 1249 // Note: This is currently not used by VM, as we don't destroy TLS key 1250 // on VM exit. 1251 void os::free_thread_local_storage(int index) { 1252 int rslt = pthread_key_delete((pthread_key_t)index); 1253 assert(rslt == 0, "invalid index"); 1254 } 1255 1256 void os::thread_local_storage_at_put(int index, void* value) { 1257 int rslt = pthread_setspecific((pthread_key_t)index, value); 1258 assert(rslt == 0, "pthread_setspecific failed"); 1259 } 1260 1261 extern "C" Thread* get_thread() { 1262 return ThreadLocalStorage::thread(); 1263 } 1264 1265 ////////////////////////////////////////////////////////////////////////////// 1266 // initial thread 1267 1268 #ifndef _ALLBSD_SOURCE 1269 // Check if current thread is the initial thread, similar to Solaris thr_main. 1270 bool os::Bsd::is_initial_thread(void) { 1271 char dummy; 1272 // If called before init complete, thread stack bottom will be null. 1273 // Can be called if fatal error occurs before initialization. 1274 if (initial_thread_stack_bottom() == NULL) return false; 1275 assert(initial_thread_stack_bottom() != NULL && 1276 initial_thread_stack_size() != 0, 1277 "os::init did not locate initial thread's stack region"); 1278 if ((address)&dummy >= initial_thread_stack_bottom() && 1279 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) 1280 return true; 1281 else return false; 1282 } 1283 1284 // Find the virtual memory area that contains addr 1285 static bool find_vma(address addr, address* vma_low, address* vma_high) { 1286 FILE *fp = fopen("/proc/self/maps", "r"); 1287 if (fp) { 1288 address low, high; 1289 while (!feof(fp)) { 1290 if (fscanf(fp, "%p-%p", &low, &high) == 2) { 1291 if (low <= addr && addr < high) { 1292 if (vma_low) *vma_low = low; 1293 if (vma_high) *vma_high = high; 1294 fclose (fp); 1295 return true; 1296 } 1297 } 1298 for (;;) { 1299 int ch = fgetc(fp); 1300 if (ch == EOF || ch == (int)'\n') break; 1301 } 1302 } 1303 fclose(fp); 1304 } 1305 return false; 1306 } 1307 1308 // Locate initial thread stack. This special handling of initial thread stack 1309 // is needed because pthread_getattr_np() on most (all?) Bsd distros returns 1310 // bogus value for initial thread. 1311 void os::Bsd::capture_initial_stack(size_t max_size) { 1312 // stack size is the easy part, get it from RLIMIT_STACK 1313 size_t stack_size; 1314 struct rlimit rlim; 1315 getrlimit(RLIMIT_STACK, &rlim); 1316 stack_size = rlim.rlim_cur; 1317 1318 // 6308388: a bug in ld.so will relocate its own .data section to the 1319 // lower end of primordial stack; reduce ulimit -s value a little bit 1320 // so we won't install guard page on ld.so's data section. 1321 stack_size -= 2 * page_size(); 1322 1323 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat 1324 // 7.1, in both cases we will get 2G in return value. 1325 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, 1326 // SuSE 7.2, Debian) can not handle alternate signal stack correctly 1327 // for initial thread if its stack size exceeds 6M. Cap it at 2M, 1328 // in case other parts in glibc still assumes 2M max stack size. 1329 // FIXME: alt signal stack is gone, maybe we can relax this constraint? 1330 #ifndef IA64 1331 if (stack_size > 2 * K * K) stack_size = 2 * K * K; 1332 #else 1333 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small 1334 if (stack_size > 4 * K * K) stack_size = 4 * K * K; 1335 #endif 1336 1337 // Try to figure out where the stack base (top) is. This is harder. 1338 // 1339 // When an application is started, glibc saves the initial stack pointer in 1340 // a global variable "__libc_stack_end", which is then used by system 1341 // libraries. __libc_stack_end should be pretty close to stack top. The 1342 // variable is available since the very early days. However, because it is 1343 // a private interface, it could disappear in the future. 1344 // 1345 // Bsd kernel saves start_stack information in /proc/<pid>/stat. Similar 1346 // to __libc_stack_end, it is very close to stack top, but isn't the real 1347 // stack top. Note that /proc may not exist if VM is running as a chroot 1348 // program, so reading /proc/<pid>/stat could fail. Also the contents of 1349 // /proc/<pid>/stat could change in the future (though unlikely). 1350 // 1351 // We try __libc_stack_end first. If that doesn't work, look for 1352 // /proc/<pid>/stat. If neither of them works, we use current stack pointer 1353 // as a hint, which should work well in most cases. 1354 1355 uintptr_t stack_start; 1356 1357 // try __libc_stack_end first 1358 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); 1359 if (p && *p) { 1360 stack_start = *p; 1361 } else { 1362 // see if we can get the start_stack field from /proc/self/stat 1363 FILE *fp; 1364 int pid; 1365 char state; 1366 int ppid; 1367 int pgrp; 1368 int session; 1369 int nr; 1370 int tpgrp; 1371 unsigned long flags; 1372 unsigned long minflt; 1373 unsigned long cminflt; 1374 unsigned long majflt; 1375 unsigned long cmajflt; 1376 unsigned long utime; 1377 unsigned long stime; 1378 long cutime; 1379 long cstime; 1380 long prio; 1381 long nice; 1382 long junk; 1383 long it_real; 1384 uintptr_t start; 1385 uintptr_t vsize; 1386 intptr_t rss; 1387 uintptr_t rsslim; 1388 uintptr_t scodes; 1389 uintptr_t ecode; 1390 int i; 1391 1392 // Figure what the primordial thread stack base is. Code is inspired 1393 // by email from Hans Boehm. /proc/self/stat begins with current pid, 1394 // followed by command name surrounded by parentheses, state, etc. 1395 char stat[2048]; 1396 int statlen; 1397 1398 fp = fopen("/proc/self/stat", "r"); 1399 if (fp) { 1400 statlen = fread(stat, 1, 2047, fp); 1401 stat[statlen] = '\0'; 1402 fclose(fp); 1403 1404 // Skip pid and the command string. Note that we could be dealing with 1405 // weird command names, e.g. user could decide to rename java launcher 1406 // to "java 1.4.2 :)", then the stat file would look like 1407 // 1234 (java 1.4.2 :)) R ... ... 1408 // We don't really need to know the command string, just find the last 1409 // occurrence of ")" and then start parsing from there. See bug 4726580. 1410 char * s = strrchr(stat, ')'); 1411 1412 i = 0; 1413 if (s) { 1414 // Skip blank chars 1415 do s++; while (isspace(*s)); 1416 1417 #define _UFM UINTX_FORMAT 1418 #define _DFM INTX_FORMAT 1419 1420 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ 1421 /* 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 */ 1422 i = sscanf(s, "%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld " _UFM _UFM _DFM _UFM _UFM _UFM _UFM, 1423 &state, /* 3 %c */ 1424 &ppid, /* 4 %d */ 1425 &pgrp, /* 5 %d */ 1426 &session, /* 6 %d */ 1427 &nr, /* 7 %d */ 1428 &tpgrp, /* 8 %d */ 1429 &flags, /* 9 %lu */ 1430 &minflt, /* 10 %lu */ 1431 &cminflt, /* 11 %lu */ 1432 &majflt, /* 12 %lu */ 1433 &cmajflt, /* 13 %lu */ 1434 &utime, /* 14 %lu */ 1435 &stime, /* 15 %lu */ 1436 &cutime, /* 16 %ld */ 1437 &cstime, /* 17 %ld */ 1438 &prio, /* 18 %ld */ 1439 &nice, /* 19 %ld */ 1440 &junk, /* 20 %ld */ 1441 &it_real, /* 21 %ld */ 1442 &start, /* 22 UINTX_FORMAT */ 1443 &vsize, /* 23 UINTX_FORMAT */ 1444 &rss, /* 24 INTX_FORMAT */ 1445 &rsslim, /* 25 UINTX_FORMAT */ 1446 &scodes, /* 26 UINTX_FORMAT */ 1447 &ecode, /* 27 UINTX_FORMAT */ 1448 &stack_start); /* 28 UINTX_FORMAT */ 1449 } 1450 1451 #undef _UFM 1452 #undef _DFM 1453 1454 if (i != 28 - 2) { 1455 assert(false, "Bad conversion from /proc/self/stat"); 1456 // product mode - assume we are the initial thread, good luck in the 1457 // embedded case. 1458 warning("Can't detect initial thread stack location - bad conversion"); 1459 stack_start = (uintptr_t) &rlim; 1460 } 1461 } else { 1462 // For some reason we can't open /proc/self/stat (for example, running on 1463 // FreeBSD with a Bsd emulator, or inside chroot), this should work for 1464 // most cases, so don't abort: 1465 warning("Can't detect initial thread stack location - no /proc/self/stat"); 1466 stack_start = (uintptr_t) &rlim; 1467 } 1468 } 1469 1470 // Now we have a pointer (stack_start) very close to the stack top, the 1471 // next thing to do is to figure out the exact location of stack top. We 1472 // can find out the virtual memory area that contains stack_start by 1473 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, 1474 // and its upper limit is the real stack top. (again, this would fail if 1475 // running inside chroot, because /proc may not exist.) 1476 1477 uintptr_t stack_top; 1478 address low, high; 1479 if (find_vma((address)stack_start, &low, &high)) { 1480 // success, "high" is the true stack top. (ignore "low", because initial 1481 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) 1482 stack_top = (uintptr_t)high; 1483 } else { 1484 // failed, likely because /proc/self/maps does not exist 1485 warning("Can't detect initial thread stack location - find_vma failed"); 1486 // best effort: stack_start is normally within a few pages below the real 1487 // stack top, use it as stack top, and reduce stack size so we won't put 1488 // guard page outside stack. 1489 stack_top = stack_start; 1490 stack_size -= 16 * page_size(); 1491 } 1492 1493 // stack_top could be partially down the page so align it 1494 stack_top = align_size_up(stack_top, page_size()); 1495 1496 if (max_size && stack_size > max_size) { 1497 _initial_thread_stack_size = max_size; 1498 } else { 1499 _initial_thread_stack_size = stack_size; 1500 } 1501 1502 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); 1503 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; 1504 } 1505 #endif 1506 1507 //////////////////////////////////////////////////////////////////////////////// 1508 // time support 1509 1510 // Time since start-up in seconds to a fine granularity. 1511 // Used by VMSelfDestructTimer and the MemProfiler. 1512 double os::elapsedTime() { 1513 1514 return (double)(os::elapsed_counter()) * 0.000001; 1515 } 1516 1517 jlong os::elapsed_counter() { 1518 timeval time; 1519 int status = gettimeofday(&time, NULL); 1520 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 1521 } 1522 1523 jlong os::elapsed_frequency() { 1524 return (1000 * 1000); 1525 } 1526 1527 // XXX: For now, code this as if BSD does not support vtime. 1528 bool os::supports_vtime() { return false; } 1529 bool os::enable_vtime() { return false; } 1530 bool os::vtime_enabled() { return false; } 1531 double os::elapsedVTime() { 1532 // better than nothing, but not much 1533 return elapsedTime(); 1534 } 1535 1536 jlong os::javaTimeMillis() { 1537 timeval time; 1538 int status = gettimeofday(&time, NULL); 1539 assert(status != -1, "bsd error"); 1540 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1541 } 1542 1543 #ifndef CLOCK_MONOTONIC 1544 #define CLOCK_MONOTONIC (1) 1545 #endif 1546 1547 #ifdef __APPLE__ 1548 void os::Bsd::clock_init() { 1549 // XXXDARWIN: Investigate replacement monotonic clock 1550 } 1551 #elif defined(_ALLBSD_SOURCE) 1552 void os::Bsd::clock_init() { 1553 struct timespec res; 1554 struct timespec tp; 1555 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 1556 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 1557 // yes, monotonic clock is supported 1558 _clock_gettime = ::clock_gettime; 1559 } 1560 } 1561 #else 1562 void os::Bsd::clock_init() { 1563 // we do dlopen's in this particular order due to bug in bsd 1564 // dynamical loader (see 6348968) leading to crash on exit 1565 void* handle = dlopen("librt.so.1", RTLD_LAZY); 1566 if (handle == NULL) { 1567 handle = dlopen("librt.so", RTLD_LAZY); 1568 } 1569 1570 if (handle) { 1571 int (*clock_getres_func)(clockid_t, struct timespec*) = 1572 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); 1573 int (*clock_gettime_func)(clockid_t, struct timespec*) = 1574 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); 1575 if (clock_getres_func && clock_gettime_func) { 1576 // See if monotonic clock is supported by the kernel. Note that some 1577 // early implementations simply return kernel jiffies (updated every 1578 // 1/100 or 1/1000 second). It would be bad to use such a low res clock 1579 // for nano time (though the monotonic property is still nice to have). 1580 // It's fixed in newer kernels, however clock_getres() still returns 1581 // 1/HZ. We check if clock_getres() works, but will ignore its reported 1582 // resolution for now. Hopefully as people move to new kernels, this 1583 // won't be a problem. 1584 struct timespec res; 1585 struct timespec tp; 1586 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && 1587 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { 1588 // yes, monotonic clock is supported 1589 _clock_gettime = clock_gettime_func; 1590 } else { 1591 // close librt if there is no monotonic clock 1592 dlclose(handle); 1593 } 1594 } 1595 } 1596 } 1597 #endif 1598 1599 #ifndef _ALLBSD_SOURCE 1600 #ifndef SYS_clock_getres 1601 1602 #if defined(IA32) || defined(AMD64) 1603 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) 1604 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) 1605 #else 1606 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" 1607 #define sys_clock_getres(x,y) -1 1608 #endif 1609 1610 #else 1611 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) 1612 #endif 1613 1614 void os::Bsd::fast_thread_clock_init() { 1615 if (!UseBsdPosixThreadCPUClocks) { 1616 return; 1617 } 1618 clockid_t clockid; 1619 struct timespec tp; 1620 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = 1621 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); 1622 1623 // Switch to using fast clocks for thread cpu time if 1624 // the sys_clock_getres() returns 0 error code. 1625 // Note, that some kernels may support the current thread 1626 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks 1627 // returned by the pthread_getcpuclockid(). 1628 // If the fast Posix clocks are supported then the sys_clock_getres() 1629 // must return at least tp.tv_sec == 0 which means a resolution 1630 // better than 1 sec. This is extra check for reliability. 1631 1632 if(pthread_getcpuclockid_func && 1633 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && 1634 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { 1635 1636 _supports_fast_thread_cpu_time = true; 1637 _pthread_getcpuclockid = pthread_getcpuclockid_func; 1638 } 1639 } 1640 #endif 1641 1642 jlong os::javaTimeNanos() { 1643 if (Bsd::supports_monotonic_clock()) { 1644 struct timespec tp; 1645 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 1646 assert(status == 0, "gettime error"); 1647 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 1648 return result; 1649 } else { 1650 timeval time; 1651 int status = gettimeofday(&time, NULL); 1652 assert(status != -1, "bsd error"); 1653 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1654 return 1000 * usecs; 1655 } 1656 } 1657 1658 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1659 if (Bsd::supports_monotonic_clock()) { 1660 info_ptr->max_value = ALL_64_BITS; 1661 1662 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1663 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1664 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1665 } else { 1666 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1667 info_ptr->max_value = ALL_64_BITS; 1668 1669 // gettimeofday is a real time clock so it skips 1670 info_ptr->may_skip_backward = true; 1671 info_ptr->may_skip_forward = true; 1672 } 1673 1674 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1675 } 1676 1677 // Return the real, user, and system times in seconds from an 1678 // arbitrary fixed point in the past. 1679 bool os::getTimesSecs(double* process_real_time, 1680 double* process_user_time, 1681 double* process_system_time) { 1682 struct tms ticks; 1683 clock_t real_ticks = times(&ticks); 1684 1685 if (real_ticks == (clock_t) (-1)) { 1686 return false; 1687 } else { 1688 double ticks_per_second = (double) clock_tics_per_sec; 1689 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1690 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1691 *process_real_time = ((double) real_ticks) / ticks_per_second; 1692 1693 return true; 1694 } 1695 } 1696 1697 1698 char * os::local_time_string(char *buf, size_t buflen) { 1699 struct tm t; 1700 time_t long_time; 1701 time(&long_time); 1702 localtime_r(&long_time, &t); 1703 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1704 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1705 t.tm_hour, t.tm_min, t.tm_sec); 1706 return buf; 1707 } 1708 1709 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1710 return localtime_r(clock, res); 1711 } 1712 1713 //////////////////////////////////////////////////////////////////////////////// 1714 // runtime exit support 1715 1716 // Note: os::shutdown() might be called very early during initialization, or 1717 // called from signal handler. Before adding something to os::shutdown(), make 1718 // sure it is async-safe and can handle partially initialized VM. 1719 void os::shutdown() { 1720 1721 // allow PerfMemory to attempt cleanup of any persistent resources 1722 perfMemory_exit(); 1723 1724 // needs to remove object in file system 1725 AttachListener::abort(); 1726 1727 // flush buffered output, finish log files 1728 ostream_abort(); 1729 1730 // Check for abort hook 1731 abort_hook_t abort_hook = Arguments::abort_hook(); 1732 if (abort_hook != NULL) { 1733 abort_hook(); 1734 } 1735 1736 } 1737 1738 // Note: os::abort() might be called very early during initialization, or 1739 // called from signal handler. Before adding something to os::abort(), make 1740 // sure it is async-safe and can handle partially initialized VM. 1741 void os::abort(bool dump_core) { 1742 os::shutdown(); 1743 if (dump_core) { 1744 #ifndef PRODUCT 1745 fdStream out(defaultStream::output_fd()); 1746 out.print_raw("Current thread is "); 1747 char buf[16]; 1748 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1749 out.print_raw_cr(buf); 1750 out.print_raw_cr("Dumping core ..."); 1751 #endif 1752 ::abort(); // dump core 1753 } 1754 1755 ::exit(1); 1756 } 1757 1758 // Die immediately, no exit hook, no abort hook, no cleanup. 1759 void os::die() { 1760 // _exit() on BsdThreads only kills current thread 1761 ::abort(); 1762 } 1763 1764 // unused on bsd for now. 1765 void os::set_error_file(const char *logfile) {} 1766 1767 1768 // This method is a copy of JDK's sysGetLastErrorString 1769 // from src/solaris/hpi/src/system_md.c 1770 1771 size_t os::lasterror(char *buf, size_t len) { 1772 1773 if (errno == 0) return 0; 1774 1775 const char *s = ::strerror(errno); 1776 size_t n = ::strlen(s); 1777 if (n >= len) { 1778 n = len - 1; 1779 } 1780 ::strncpy(buf, s, n); 1781 buf[n] = '\0'; 1782 return n; 1783 } 1784 1785 intx os::current_thread_id() { return (intx)pthread_self(); } 1786 int os::current_process_id() { 1787 1788 // Under the old bsd thread library, bsd gives each thread 1789 // its own process id. Because of this each thread will return 1790 // a different pid if this method were to return the result 1791 // of getpid(2). Bsd provides no api that returns the pid 1792 // of the launcher thread for the vm. This implementation 1793 // returns a unique pid, the pid of the launcher thread 1794 // that starts the vm 'process'. 1795 1796 // Under the NPTL, getpid() returns the same pid as the 1797 // launcher thread rather than a unique pid per thread. 1798 // Use gettid() if you want the old pre NPTL behaviour. 1799 1800 // if you are looking for the result of a call to getpid() that 1801 // returns a unique pid for the calling thread, then look at the 1802 // OSThread::thread_id() method in osThread_bsd.hpp file 1803 1804 return (int)(_initial_pid ? _initial_pid : getpid()); 1805 } 1806 1807 // DLL functions 1808 1809 #define JNI_LIB_PREFIX "lib" 1810 #ifdef __APPLE__ 1811 #define JNI_LIB_SUFFIX ".dylib" 1812 #else 1813 #define JNI_LIB_SUFFIX ".so" 1814 #endif 1815 1816 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1817 1818 // This must be hard coded because it's the system's temporary 1819 // directory not the java application's temp directory, ala java.io.tmpdir. 1820 #ifdef __APPLE__ 1821 // macosx has a secure per-user temporary directory 1822 char temp_path_storage[PATH_MAX]; 1823 const char* os::get_temp_directory() { 1824 static char *temp_path = NULL; 1825 if (temp_path == NULL) { 1826 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1827 if (pathSize == 0 || pathSize > PATH_MAX) { 1828 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1829 } 1830 temp_path = temp_path_storage; 1831 } 1832 return temp_path; 1833 } 1834 #else /* __APPLE__ */ 1835 const char* os::get_temp_directory() { return "/tmp"; } 1836 #endif /* __APPLE__ */ 1837 1838 static bool file_exists(const char* filename) { 1839 struct stat statbuf; 1840 if (filename == NULL || strlen(filename) == 0) { 1841 return false; 1842 } 1843 return os::stat(filename, &statbuf) == 0; 1844 } 1845 1846 void os::dll_build_name(char* buffer, size_t buflen, 1847 const char* pname, const char* fname) { 1848 // Copied from libhpi 1849 const size_t pnamelen = pname ? strlen(pname) : 0; 1850 1851 // Quietly truncate on buffer overflow. Should be an error. 1852 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1853 *buffer = '\0'; 1854 return; 1855 } 1856 1857 if (pnamelen == 0) { 1858 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1859 } else if (strchr(pname, *os::path_separator()) != NULL) { 1860 int n; 1861 char** pelements = split_path(pname, &n); 1862 for (int i = 0 ; i < n ; i++) { 1863 // Really shouldn't be NULL, but check can't hurt 1864 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1865 continue; // skip the empty path values 1866 } 1867 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1868 pelements[i], fname); 1869 if (file_exists(buffer)) { 1870 break; 1871 } 1872 } 1873 // release the storage 1874 for (int i = 0 ; i < n ; i++) { 1875 if (pelements[i] != NULL) { 1876 FREE_C_HEAP_ARRAY(char, pelements[i]); 1877 } 1878 } 1879 if (pelements != NULL) { 1880 FREE_C_HEAP_ARRAY(char*, pelements); 1881 } 1882 } else { 1883 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1884 } 1885 } 1886 1887 const char* os::get_current_directory(char *buf, int buflen) { 1888 return getcwd(buf, buflen); 1889 } 1890 1891 // check if addr is inside libjvm[_g].so 1892 bool os::address_is_in_vm(address addr) { 1893 static address libjvm_base_addr; 1894 Dl_info dlinfo; 1895 1896 if (libjvm_base_addr == NULL) { 1897 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1898 libjvm_base_addr = (address)dlinfo.dli_fbase; 1899 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1900 } 1901 1902 if (dladdr((void *)addr, &dlinfo)) { 1903 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1904 } 1905 1906 return false; 1907 } 1908 1909 bool os::dll_address_to_function_name(address addr, char *buf, 1910 int buflen, int *offset) { 1911 Dl_info dlinfo; 1912 1913 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1914 if (buf != NULL) { 1915 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1916 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1917 } 1918 } 1919 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1920 return true; 1921 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1922 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1923 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) { 1924 return true; 1925 } 1926 } 1927 1928 if (buf != NULL) buf[0] = '\0'; 1929 if (offset != NULL) *offset = -1; 1930 return false; 1931 } 1932 1933 #ifdef _ALLBSD_SOURCE 1934 // ported from solaris version 1935 bool os::dll_address_to_library_name(address addr, char* buf, 1936 int buflen, int* offset) { 1937 Dl_info dlinfo; 1938 1939 if (dladdr((void*)addr, &dlinfo)){ 1940 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1941 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1942 return true; 1943 } else { 1944 if (buf) buf[0] = '\0'; 1945 if (offset) *offset = -1; 1946 return false; 1947 } 1948 } 1949 #else 1950 struct _address_to_library_name { 1951 address addr; // input : memory address 1952 size_t buflen; // size of fname 1953 char* fname; // output: library name 1954 address base; // library base addr 1955 }; 1956 1957 static int address_to_library_name_callback(struct dl_phdr_info *info, 1958 size_t size, void *data) { 1959 int i; 1960 bool found = false; 1961 address libbase = NULL; 1962 struct _address_to_library_name * d = (struct _address_to_library_name *)data; 1963 1964 // iterate through all loadable segments 1965 for (i = 0; i < info->dlpi_phnum; i++) { 1966 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); 1967 if (info->dlpi_phdr[i].p_type == PT_LOAD) { 1968 // base address of a library is the lowest address of its loaded 1969 // segments. 1970 if (libbase == NULL || libbase > segbase) { 1971 libbase = segbase; 1972 } 1973 // see if 'addr' is within current segment 1974 if (segbase <= d->addr && 1975 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { 1976 found = true; 1977 } 1978 } 1979 } 1980 1981 // dlpi_name is NULL or empty if the ELF file is executable, return 0 1982 // so dll_address_to_library_name() can fall through to use dladdr() which 1983 // can figure out executable name from argv[0]. 1984 if (found && info->dlpi_name && info->dlpi_name[0]) { 1985 d->base = libbase; 1986 if (d->fname) { 1987 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); 1988 } 1989 return 1; 1990 } 1991 return 0; 1992 } 1993 1994 bool os::dll_address_to_library_name(address addr, char* buf, 1995 int buflen, int* offset) { 1996 Dl_info dlinfo; 1997 struct _address_to_library_name data; 1998 1999 // There is a bug in old glibc dladdr() implementation that it could resolve 2000 // to wrong library name if the .so file has a base address != NULL. Here 2001 // we iterate through the program headers of all loaded libraries to find 2002 // out which library 'addr' really belongs to. This workaround can be 2003 // removed once the minimum requirement for glibc is moved to 2.3.x. 2004 data.addr = addr; 2005 data.fname = buf; 2006 data.buflen = buflen; 2007 data.base = NULL; 2008 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); 2009 2010 if (rslt) { 2011 // buf already contains library name 2012 if (offset) *offset = addr - data.base; 2013 return true; 2014 } else if (dladdr((void*)addr, &dlinfo)){ 2015 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 2016 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 2017 return true; 2018 } else { 2019 if (buf) buf[0] = '\0'; 2020 if (offset) *offset = -1; 2021 return false; 2022 } 2023 } 2024 #endif 2025 2026 // Loads .dll/.so and 2027 // in case of error it checks if .dll/.so was built for the 2028 // same architecture as Hotspot is running on 2029 2030 #ifdef __APPLE__ 2031 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 2032 void * result= ::dlopen(filename, RTLD_LAZY); 2033 if (result != NULL) { 2034 // Successful loading 2035 return result; 2036 } 2037 2038 // Read system error message into ebuf 2039 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2040 ebuf[ebuflen-1]='\0'; 2041 2042 return NULL; 2043 } 2044 #else 2045 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 2046 { 2047 void * result= ::dlopen(filename, RTLD_LAZY); 2048 if (result != NULL) { 2049 // Successful loading 2050 return result; 2051 } 2052 2053 Elf32_Ehdr elf_head; 2054 2055 // Read system error message into ebuf 2056 // It may or may not be overwritten below 2057 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2058 ebuf[ebuflen-1]='\0'; 2059 int diag_msg_max_length=ebuflen-strlen(ebuf); 2060 char* diag_msg_buf=ebuf+strlen(ebuf); 2061 2062 if (diag_msg_max_length==0) { 2063 // No more space in ebuf for additional diagnostics message 2064 return NULL; 2065 } 2066 2067 2068 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 2069 2070 if (file_descriptor < 0) { 2071 // Can't open library, report dlerror() message 2072 return NULL; 2073 } 2074 2075 bool failed_to_read_elf_head= 2076 (sizeof(elf_head)!= 2077 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 2078 2079 ::close(file_descriptor); 2080 if (failed_to_read_elf_head) { 2081 // file i/o error - report dlerror() msg 2082 return NULL; 2083 } 2084 2085 typedef struct { 2086 Elf32_Half code; // Actual value as defined in elf.h 2087 Elf32_Half compat_class; // Compatibility of archs at VM's sense 2088 char elf_class; // 32 or 64 bit 2089 char endianess; // MSB or LSB 2090 char* name; // String representation 2091 } arch_t; 2092 2093 #ifndef EM_486 2094 #define EM_486 6 /* Intel 80486 */ 2095 #endif 2096 2097 #ifndef EM_MIPS_RS3_LE 2098 #define EM_MIPS_RS3_LE 10 /* MIPS */ 2099 #endif 2100 2101 #ifndef EM_PPC64 2102 #define EM_PPC64 21 /* PowerPC64 */ 2103 #endif 2104 2105 #ifndef EM_S390 2106 #define EM_S390 22 /* IBM System/390 */ 2107 #endif 2108 2109 #ifndef EM_IA_64 2110 #define EM_IA_64 50 /* HP/Intel IA-64 */ 2111 #endif 2112 2113 #ifndef EM_X86_64 2114 #define EM_X86_64 62 /* AMD x86-64 */ 2115 #endif 2116 2117 static const arch_t arch_array[]={ 2118 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2119 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2120 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 2121 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 2122 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2123 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2124 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2125 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2126 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2127 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 2128 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 2129 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 2130 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 2131 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 2132 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 2133 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 2134 }; 2135 2136 #if (defined IA32) 2137 static Elf32_Half running_arch_code=EM_386; 2138 #elif (defined AMD64) 2139 static Elf32_Half running_arch_code=EM_X86_64; 2140 #elif (defined IA64) 2141 static Elf32_Half running_arch_code=EM_IA_64; 2142 #elif (defined __sparc) && (defined _LP64) 2143 static Elf32_Half running_arch_code=EM_SPARCV9; 2144 #elif (defined __sparc) && (!defined _LP64) 2145 static Elf32_Half running_arch_code=EM_SPARC; 2146 #elif (defined __powerpc64__) 2147 static Elf32_Half running_arch_code=EM_PPC64; 2148 #elif (defined __powerpc__) 2149 static Elf32_Half running_arch_code=EM_PPC; 2150 #elif (defined ARM) 2151 static Elf32_Half running_arch_code=EM_ARM; 2152 #elif (defined S390) 2153 static Elf32_Half running_arch_code=EM_S390; 2154 #elif (defined ALPHA) 2155 static Elf32_Half running_arch_code=EM_ALPHA; 2156 #elif (defined MIPSEL) 2157 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 2158 #elif (defined PARISC) 2159 static Elf32_Half running_arch_code=EM_PARISC; 2160 #elif (defined MIPS) 2161 static Elf32_Half running_arch_code=EM_MIPS; 2162 #elif (defined M68K) 2163 static Elf32_Half running_arch_code=EM_68K; 2164 #else 2165 #error Method os::dll_load requires that one of following is defined:\ 2166 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 2167 #endif 2168 2169 // Identify compatability class for VM's architecture and library's architecture 2170 // Obtain string descriptions for architectures 2171 2172 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2173 int running_arch_index=-1; 2174 2175 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2176 if (running_arch_code == arch_array[i].code) { 2177 running_arch_index = i; 2178 } 2179 if (lib_arch.code == arch_array[i].code) { 2180 lib_arch.compat_class = arch_array[i].compat_class; 2181 lib_arch.name = arch_array[i].name; 2182 } 2183 } 2184 2185 assert(running_arch_index != -1, 2186 "Didn't find running architecture code (running_arch_code) in arch_array"); 2187 if (running_arch_index == -1) { 2188 // Even though running architecture detection failed 2189 // we may still continue with reporting dlerror() message 2190 return NULL; 2191 } 2192 2193 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2194 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2195 return NULL; 2196 } 2197 2198 #ifndef S390 2199 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2200 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2201 return NULL; 2202 } 2203 #endif // !S390 2204 2205 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2206 if ( lib_arch.name!=NULL ) { 2207 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2208 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2209 lib_arch.name, arch_array[running_arch_index].name); 2210 } else { 2211 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2212 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2213 lib_arch.code, 2214 arch_array[running_arch_index].name); 2215 } 2216 } 2217 2218 return NULL; 2219 } 2220 #endif /* !__APPLE__ */ 2221 2222 // XXX: Do we need a lock around this as per Linux? 2223 void* os::dll_lookup(void* handle, const char* name) { 2224 return dlsym(handle, name); 2225 } 2226 2227 2228 static bool _print_ascii_file(const char* filename, outputStream* st) { 2229 int fd = ::open(filename, O_RDONLY); 2230 if (fd == -1) { 2231 return false; 2232 } 2233 2234 char buf[32]; 2235 int bytes; 2236 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2237 st->print_raw(buf, bytes); 2238 } 2239 2240 ::close(fd); 2241 2242 return true; 2243 } 2244 2245 void os::print_dll_info(outputStream *st) { 2246 st->print_cr("Dynamic libraries:"); 2247 #ifdef _ALLBSD_SOURCE 2248 #ifdef RTLD_DI_LINKMAP 2249 Dl_info dli; 2250 void *handle; 2251 Link_map *map; 2252 Link_map *p; 2253 2254 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 2255 st->print_cr("Error: Cannot print dynamic libraries."); 2256 return; 2257 } 2258 handle = dlopen(dli.dli_fname, RTLD_LAZY); 2259 if (handle == NULL) { 2260 st->print_cr("Error: Cannot print dynamic libraries."); 2261 return; 2262 } 2263 dlinfo(handle, RTLD_DI_LINKMAP, &map); 2264 if (map == NULL) { 2265 st->print_cr("Error: Cannot print dynamic libraries."); 2266 return; 2267 } 2268 2269 while (map->l_prev != NULL) 2270 map = map->l_prev; 2271 2272 while (map != NULL) { 2273 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 2274 map = map->l_next; 2275 } 2276 2277 dlclose(handle); 2278 #elif defined(__APPLE__) 2279 uint32_t count; 2280 uint32_t i; 2281 2282 count = _dyld_image_count(); 2283 for (i = 1; i < count; i++) { 2284 const char *name = _dyld_get_image_name(i); 2285 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 2286 st->print_cr(PTR_FORMAT " \t%s", slide, name); 2287 } 2288 #else 2289 st->print_cr("Error: Cannot print dynamic libraries."); 2290 #endif 2291 #else 2292 char fname[32]; 2293 pid_t pid = os::Bsd::gettid(); 2294 2295 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); 2296 2297 if (!_print_ascii_file(fname, st)) { 2298 st->print("Can not get library information for pid = %d\n", pid); 2299 } 2300 #endif 2301 } 2302 2303 2304 void os::print_os_info(outputStream* st) { 2305 st->print("OS:"); 2306 2307 // Try to identify popular distros. 2308 // Most Bsd distributions have /etc/XXX-release file, which contains 2309 // the OS version string. Some have more than one /etc/XXX-release file 2310 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), 2311 // so the order is important. 2312 if (!_print_ascii_file("/etc/mandrake-release", st) && 2313 !_print_ascii_file("/etc/sun-release", st) && 2314 !_print_ascii_file("/etc/redhat-release", st) && 2315 !_print_ascii_file("/etc/SuSE-release", st) && 2316 !_print_ascii_file("/etc/turbobsd-release", st) && 2317 !_print_ascii_file("/etc/gentoo-release", st) && 2318 !_print_ascii_file("/etc/debian_version", st) && 2319 !_print_ascii_file("/etc/ltib-release", st) && 2320 !_print_ascii_file("/etc/angstrom-version", st)) { 2321 st->print("Bsd"); 2322 } 2323 st->cr(); 2324 2325 // kernel 2326 st->print("uname:"); 2327 struct utsname name; 2328 uname(&name); 2329 st->print(name.sysname); st->print(" "); 2330 st->print(name.release); st->print(" "); 2331 st->print(name.version); st->print(" "); 2332 st->print(name.machine); 2333 st->cr(); 2334 2335 #ifndef _ALLBSD_SOURCE 2336 // Print warning if unsafe chroot environment detected 2337 if (unsafe_chroot_detected) { 2338 st->print("WARNING!! "); 2339 st->print_cr(unstable_chroot_error); 2340 } 2341 2342 // libc, pthread 2343 st->print("libc:"); 2344 st->print(os::Bsd::glibc_version()); st->print(" "); 2345 st->print(os::Bsd::libpthread_version()); st->print(" "); 2346 if (os::Bsd::is_BsdThreads()) { 2347 st->print("(%s stack)", os::Bsd::is_floating_stack() ? "floating" : "fixed"); 2348 } 2349 st->cr(); 2350 #endif 2351 2352 // rlimit 2353 st->print("rlimit:"); 2354 struct rlimit rlim; 2355 2356 st->print(" STACK "); 2357 getrlimit(RLIMIT_STACK, &rlim); 2358 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2359 else st->print("%uk", rlim.rlim_cur >> 10); 2360 2361 st->print(", CORE "); 2362 getrlimit(RLIMIT_CORE, &rlim); 2363 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2364 else st->print("%uk", rlim.rlim_cur >> 10); 2365 2366 st->print(", NPROC "); 2367 getrlimit(RLIMIT_NPROC, &rlim); 2368 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2369 else st->print("%d", rlim.rlim_cur); 2370 2371 st->print(", NOFILE "); 2372 getrlimit(RLIMIT_NOFILE, &rlim); 2373 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2374 else st->print("%d", rlim.rlim_cur); 2375 2376 #ifndef _ALLBSD_SOURCE 2377 st->print(", AS "); 2378 getrlimit(RLIMIT_AS, &rlim); 2379 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2380 else st->print("%uk", rlim.rlim_cur >> 10); 2381 st->cr(); 2382 2383 // load average 2384 st->print("load average:"); 2385 double loadavg[3]; 2386 os::loadavg(loadavg, 3); 2387 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 2388 st->cr(); 2389 #endif 2390 } 2391 2392 void os::pd_print_cpu_info(outputStream* st) { 2393 // Nothing to do for now. 2394 } 2395 2396 void os::print_memory_info(outputStream* st) { 2397 2398 st->print("Memory:"); 2399 st->print(" %dk page", os::vm_page_size()>>10); 2400 2401 #ifndef _ALLBSD_SOURCE 2402 // values in struct sysinfo are "unsigned long" 2403 struct sysinfo si; 2404 sysinfo(&si); 2405 #endif 2406 2407 st->print(", physical " UINT64_FORMAT "k", 2408 os::physical_memory() >> 10); 2409 st->print("(" UINT64_FORMAT "k free)", 2410 os::available_memory() >> 10); 2411 #ifndef _ALLBSD_SOURCE 2412 st->print(", swap " UINT64_FORMAT "k", 2413 ((jlong)si.totalswap * si.mem_unit) >> 10); 2414 st->print("(" UINT64_FORMAT "k free)", 2415 ((jlong)si.freeswap * si.mem_unit) >> 10); 2416 #endif 2417 st->cr(); 2418 2419 // meminfo 2420 st->print("\n/proc/meminfo:\n"); 2421 _print_ascii_file("/proc/meminfo", st); 2422 st->cr(); 2423 } 2424 2425 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 2426 // but they're the same for all the bsd arch that we support 2427 // and they're the same for solaris but there's no common place to put this. 2428 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2429 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2430 "ILL_COPROC", "ILL_BADSTK" }; 2431 2432 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2433 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2434 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 2435 2436 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2437 2438 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2439 2440 void os::print_siginfo(outputStream* st, void* siginfo) { 2441 st->print("siginfo:"); 2442 2443 const int buflen = 100; 2444 char buf[buflen]; 2445 siginfo_t *si = (siginfo_t*)siginfo; 2446 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2447 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 2448 st->print("si_errno=%s", buf); 2449 } else { 2450 st->print("si_errno=%d", si->si_errno); 2451 } 2452 const int c = si->si_code; 2453 assert(c > 0, "unexpected si_code"); 2454 switch (si->si_signo) { 2455 case SIGILL: 2456 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2457 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2458 break; 2459 case SIGFPE: 2460 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2461 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2462 break; 2463 case SIGSEGV: 2464 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2465 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2466 break; 2467 case SIGBUS: 2468 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2469 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2470 break; 2471 default: 2472 st->print(", si_code=%d", si->si_code); 2473 // no si_addr 2474 } 2475 2476 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2477 UseSharedSpaces) { 2478 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2479 if (mapinfo->is_in_shared_space(si->si_addr)) { 2480 st->print("\n\nError accessing class data sharing archive." \ 2481 " Mapped file inaccessible during execution, " \ 2482 " possible disk/network problem."); 2483 } 2484 } 2485 st->cr(); 2486 } 2487 2488 2489 static void print_signal_handler(outputStream* st, int sig, 2490 char* buf, size_t buflen); 2491 2492 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2493 st->print_cr("Signal Handlers:"); 2494 print_signal_handler(st, SIGSEGV, buf, buflen); 2495 print_signal_handler(st, SIGBUS , buf, buflen); 2496 print_signal_handler(st, SIGFPE , buf, buflen); 2497 print_signal_handler(st, SIGPIPE, buf, buflen); 2498 print_signal_handler(st, SIGXFSZ, buf, buflen); 2499 print_signal_handler(st, SIGILL , buf, buflen); 2500 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2501 print_signal_handler(st, SR_signum, buf, buflen); 2502 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 2503 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2504 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 2505 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2506 } 2507 2508 static char saved_jvm_path[MAXPATHLEN] = {0}; 2509 2510 // Find the full path to the current module, libjvm.so or libjvm_g.so 2511 void os::jvm_path(char *buf, jint buflen) { 2512 // Error checking. 2513 if (buflen < MAXPATHLEN) { 2514 assert(false, "must use a large-enough buffer"); 2515 buf[0] = '\0'; 2516 return; 2517 } 2518 // Lazy resolve the path to current module. 2519 if (saved_jvm_path[0] != 0) { 2520 strcpy(buf, saved_jvm_path); 2521 return; 2522 } 2523 2524 char dli_fname[MAXPATHLEN]; 2525 bool ret = dll_address_to_library_name( 2526 CAST_FROM_FN_PTR(address, os::jvm_path), 2527 dli_fname, sizeof(dli_fname), NULL); 2528 assert(ret != 0, "cannot locate libjvm"); 2529 char *rp = realpath(dli_fname, buf); 2530 if (rp == NULL) 2531 return; 2532 2533 if (Arguments::created_by_gamma_launcher()) { 2534 // Support for the gamma launcher. Typical value for buf is 2535 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2536 // the right place in the string, then assume we are installed in a JDK and 2537 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2538 // up the path so it looks like libjvm.so is installed there (append a 2539 // fake suffix hotspot/libjvm.so). 2540 const char *p = buf + strlen(buf) - 1; 2541 for (int count = 0; p > buf && count < 5; ++count) { 2542 for (--p; p > buf && *p != '/'; --p) 2543 /* empty */ ; 2544 } 2545 2546 if (strncmp(p, "/jre/lib/", 9) != 0) { 2547 // Look for JAVA_HOME in the environment. 2548 char* java_home_var = ::getenv("JAVA_HOME"); 2549 if (java_home_var != NULL && java_home_var[0] != 0) { 2550 char* jrelib_p; 2551 int len; 2552 2553 // Check the current module name "libjvm.so" or "libjvm_g.so". 2554 p = strrchr(buf, '/'); 2555 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2556 p = strstr(p, "_g") ? "_g" : ""; 2557 2558 rp = realpath(java_home_var, buf); 2559 if (rp == NULL) 2560 return; 2561 2562 // determine if this is a legacy image or modules image 2563 // modules image doesn't have "jre" subdirectory 2564 len = strlen(buf); 2565 jrelib_p = buf + len; 2566 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2567 if (0 != access(buf, F_OK)) { 2568 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2569 } 2570 2571 if (0 == access(buf, F_OK)) { 2572 // Use current module name "libjvm[_g].so" instead of 2573 // "libjvm"debug_only("_g")".so" since for fastdebug version 2574 // we should have "libjvm.so" but debug_only("_g") adds "_g"! 2575 len = strlen(buf); 2576 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p); 2577 } else { 2578 // Go back to path of .so 2579 rp = realpath(dli_fname, buf); 2580 if (rp == NULL) 2581 return; 2582 } 2583 } 2584 } 2585 } 2586 2587 strcpy(saved_jvm_path, buf); 2588 } 2589 2590 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2591 // no prefix required, not even "_" 2592 } 2593 2594 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2595 // no suffix required 2596 } 2597 2598 //////////////////////////////////////////////////////////////////////////////// 2599 // sun.misc.Signal support 2600 2601 static volatile jint sigint_count = 0; 2602 2603 static void 2604 UserHandler(int sig, void *siginfo, void *context) { 2605 // 4511530 - sem_post is serialized and handled by the manager thread. When 2606 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 2607 // don't want to flood the manager thread with sem_post requests. 2608 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 2609 return; 2610 2611 // Ctrl-C is pressed during error reporting, likely because the error 2612 // handler fails to abort. Let VM die immediately. 2613 if (sig == SIGINT && is_error_reported()) { 2614 os::die(); 2615 } 2616 2617 os::signal_notify(sig); 2618 } 2619 2620 void* os::user_handler() { 2621 return CAST_FROM_FN_PTR(void*, UserHandler); 2622 } 2623 2624 extern "C" { 2625 typedef void (*sa_handler_t)(int); 2626 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2627 } 2628 2629 void* os::signal(int signal_number, void* handler) { 2630 struct sigaction sigAct, oldSigAct; 2631 2632 sigfillset(&(sigAct.sa_mask)); 2633 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 2634 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2635 2636 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2637 // -1 means registration failed 2638 return (void *)-1; 2639 } 2640 2641 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2642 } 2643 2644 void os::signal_raise(int signal_number) { 2645 ::raise(signal_number); 2646 } 2647 2648 /* 2649 * The following code is moved from os.cpp for making this 2650 * code platform specific, which it is by its very nature. 2651 */ 2652 2653 // Will be modified when max signal is changed to be dynamic 2654 int os::sigexitnum_pd() { 2655 return NSIG; 2656 } 2657 2658 // a counter for each possible signal value 2659 static volatile jint pending_signals[NSIG+1] = { 0 }; 2660 2661 // Bsd(POSIX) specific hand shaking semaphore. 2662 #ifdef __APPLE__ 2663 static semaphore_t sig_sem; 2664 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 2665 #define SEM_WAIT(sem) semaphore_wait(sem); 2666 #define SEM_POST(sem) semaphore_signal(sem); 2667 #else 2668 static sem_t sig_sem; 2669 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 2670 #define SEM_WAIT(sem) sem_wait(&sem); 2671 #define SEM_POST(sem) sem_post(&sem); 2672 #endif 2673 2674 void os::signal_init_pd() { 2675 // Initialize signal structures 2676 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2677 2678 // Initialize signal semaphore 2679 ::SEM_INIT(sig_sem, 0); 2680 } 2681 2682 void os::signal_notify(int sig) { 2683 Atomic::inc(&pending_signals[sig]); 2684 ::SEM_POST(sig_sem); 2685 } 2686 2687 static int check_pending_signals(bool wait) { 2688 Atomic::store(0, &sigint_count); 2689 for (;;) { 2690 for (int i = 0; i < NSIG + 1; i++) { 2691 jint n = pending_signals[i]; 2692 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2693 return i; 2694 } 2695 } 2696 if (!wait) { 2697 return -1; 2698 } 2699 JavaThread *thread = JavaThread::current(); 2700 ThreadBlockInVM tbivm(thread); 2701 2702 bool threadIsSuspended; 2703 do { 2704 thread->set_suspend_equivalent(); 2705 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2706 ::SEM_WAIT(sig_sem); 2707 2708 // were we externally suspended while we were waiting? 2709 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2710 if (threadIsSuspended) { 2711 // 2712 // The semaphore has been incremented, but while we were waiting 2713 // another thread suspended us. We don't want to continue running 2714 // while suspended because that would surprise the thread that 2715 // suspended us. 2716 // 2717 ::SEM_POST(sig_sem); 2718 2719 thread->java_suspend_self(); 2720 } 2721 } while (threadIsSuspended); 2722 } 2723 } 2724 2725 int os::signal_lookup() { 2726 return check_pending_signals(false); 2727 } 2728 2729 int os::signal_wait() { 2730 return check_pending_signals(true); 2731 } 2732 2733 //////////////////////////////////////////////////////////////////////////////// 2734 // Virtual Memory 2735 2736 int os::vm_page_size() { 2737 // Seems redundant as all get out 2738 assert(os::Bsd::page_size() != -1, "must call os::init"); 2739 return os::Bsd::page_size(); 2740 } 2741 2742 // Solaris allocates memory by pages. 2743 int os::vm_allocation_granularity() { 2744 assert(os::Bsd::page_size() != -1, "must call os::init"); 2745 return os::Bsd::page_size(); 2746 } 2747 2748 // Rationale behind this function: 2749 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2750 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2751 // samples for JITted code. Here we create private executable mapping over the code cache 2752 // and then we can use standard (well, almost, as mapping can change) way to provide 2753 // info for the reporting script by storing timestamp and location of symbol 2754 void bsd_wrap_code(char* base, size_t size) { 2755 static volatile jint cnt = 0; 2756 2757 if (!UseOprofile) { 2758 return; 2759 } 2760 2761 char buf[PATH_MAX + 1]; 2762 int num = Atomic::add(1, &cnt); 2763 2764 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2765 os::get_temp_directory(), os::current_process_id(), num); 2766 unlink(buf); 2767 2768 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2769 2770 if (fd != -1) { 2771 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2772 if (rv != (off_t)-1) { 2773 if (::write(fd, "", 1) == 1) { 2774 mmap(base, size, 2775 PROT_READ|PROT_WRITE|PROT_EXEC, 2776 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2777 } 2778 } 2779 ::close(fd); 2780 unlink(buf); 2781 } 2782 } 2783 2784 // NOTE: Bsd kernel does not really reserve the pages for us. 2785 // All it does is to check if there are enough free pages 2786 // left at the time of mmap(). This could be a potential 2787 // problem. 2788 bool os::commit_memory(char* addr, size_t size, bool exec) { 2789 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2790 #ifdef __OpenBSD__ 2791 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2792 return ::mprotect(addr, size, prot) == 0; 2793 #else 2794 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2795 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2796 return res != (uintptr_t) MAP_FAILED; 2797 #endif 2798 } 2799 2800 #ifndef _ALLBSD_SOURCE 2801 // Define MAP_HUGETLB here so we can build HotSpot on old systems. 2802 #ifndef MAP_HUGETLB 2803 #define MAP_HUGETLB 0x40000 2804 #endif 2805 2806 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. 2807 #ifndef MADV_HUGEPAGE 2808 #define MADV_HUGEPAGE 14 2809 #endif 2810 #endif 2811 2812 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 2813 bool exec) { 2814 #ifndef _ALLBSD_SOURCE 2815 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { 2816 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2817 uintptr_t res = 2818 (uintptr_t) ::mmap(addr, size, prot, 2819 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, 2820 -1, 0); 2821 return res != (uintptr_t) MAP_FAILED; 2822 } 2823 #endif 2824 2825 return commit_memory(addr, size, exec); 2826 } 2827 2828 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2829 #ifndef _ALLBSD_SOURCE 2830 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { 2831 // We don't check the return value: madvise(MADV_HUGEPAGE) may not 2832 // be supported or the memory may already be backed by huge pages. 2833 ::madvise(addr, bytes, MADV_HUGEPAGE); 2834 } 2835 #endif 2836 } 2837 2838 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2839 ::madvise(addr, bytes, MADV_DONTNEED); 2840 } 2841 2842 void os::numa_make_global(char *addr, size_t bytes) { 2843 } 2844 2845 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2846 } 2847 2848 bool os::numa_topology_changed() { return false; } 2849 2850 size_t os::numa_get_groups_num() { 2851 return 1; 2852 } 2853 2854 int os::numa_get_group_id() { 2855 return 0; 2856 } 2857 2858 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2859 if (size > 0) { 2860 ids[0] = 0; 2861 return 1; 2862 } 2863 return 0; 2864 } 2865 2866 bool os::get_page_info(char *start, page_info* info) { 2867 return false; 2868 } 2869 2870 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2871 return end; 2872 } 2873 2874 #ifndef _ALLBSD_SOURCE 2875 // Something to do with the numa-aware allocator needs these symbols 2876 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } 2877 extern "C" JNIEXPORT void numa_error(char *where) { } 2878 extern "C" JNIEXPORT int fork1() { return fork(); } 2879 2880 2881 // If we are running with libnuma version > 2, then we should 2882 // be trying to use symbols with versions 1.1 2883 // If we are running with earlier version, which did not have symbol versions, 2884 // we should use the base version. 2885 void* os::Bsd::libnuma_dlsym(void* handle, const char *name) { 2886 void *f = dlvsym(handle, name, "libnuma_1.1"); 2887 if (f == NULL) { 2888 f = dlsym(handle, name); 2889 } 2890 return f; 2891 } 2892 2893 bool os::Bsd::libnuma_init() { 2894 // sched_getcpu() should be in libc. 2895 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, 2896 dlsym(RTLD_DEFAULT, "sched_getcpu"))); 2897 2898 if (sched_getcpu() != -1) { // Does it work? 2899 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); 2900 if (handle != NULL) { 2901 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, 2902 libnuma_dlsym(handle, "numa_node_to_cpus"))); 2903 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, 2904 libnuma_dlsym(handle, "numa_max_node"))); 2905 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, 2906 libnuma_dlsym(handle, "numa_available"))); 2907 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, 2908 libnuma_dlsym(handle, "numa_tonode_memory"))); 2909 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, 2910 libnuma_dlsym(handle, "numa_interleave_memory"))); 2911 2912 2913 if (numa_available() != -1) { 2914 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); 2915 // Create a cpu -> node mapping 2916 _cpu_to_node = new (ResourceObj::C_HEAP) GrowableArray<int>(0, true); 2917 rebuild_cpu_to_node_map(); 2918 return true; 2919 } 2920 } 2921 } 2922 return false; 2923 } 2924 2925 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. 2926 // The table is later used in get_node_by_cpu(). 2927 void os::Bsd::rebuild_cpu_to_node_map() { 2928 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure 2929 // in libnuma (possible values are starting from 16, 2930 // and continuing up with every other power of 2, but less 2931 // than the maximum number of CPUs supported by kernel), and 2932 // is a subject to change (in libnuma version 2 the requirements 2933 // are more reasonable) we'll just hardcode the number they use 2934 // in the library. 2935 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; 2936 2937 size_t cpu_num = os::active_processor_count(); 2938 size_t cpu_map_size = NCPUS / BitsPerCLong; 2939 size_t cpu_map_valid_size = 2940 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); 2941 2942 cpu_to_node()->clear(); 2943 cpu_to_node()->at_grow(cpu_num - 1); 2944 size_t node_num = numa_get_groups_num(); 2945 2946 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size); 2947 for (size_t i = 0; i < node_num; i++) { 2948 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { 2949 for (size_t j = 0; j < cpu_map_valid_size; j++) { 2950 if (cpu_map[j] != 0) { 2951 for (size_t k = 0; k < BitsPerCLong; k++) { 2952 if (cpu_map[j] & (1UL << k)) { 2953 cpu_to_node()->at_put(j * BitsPerCLong + k, i); 2954 } 2955 } 2956 } 2957 } 2958 } 2959 } 2960 FREE_C_HEAP_ARRAY(unsigned long, cpu_map); 2961 } 2962 2963 int os::Bsd::get_node_by_cpu(int cpu_id) { 2964 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { 2965 return cpu_to_node()->at(cpu_id); 2966 } 2967 return -1; 2968 } 2969 2970 GrowableArray<int>* os::Bsd::_cpu_to_node; 2971 os::Bsd::sched_getcpu_func_t os::Bsd::_sched_getcpu; 2972 os::Bsd::numa_node_to_cpus_func_t os::Bsd::_numa_node_to_cpus; 2973 os::Bsd::numa_max_node_func_t os::Bsd::_numa_max_node; 2974 os::Bsd::numa_available_func_t os::Bsd::_numa_available; 2975 os::Bsd::numa_tonode_memory_func_t os::Bsd::_numa_tonode_memory; 2976 os::Bsd::numa_interleave_memory_func_t os::Bsd::_numa_interleave_memory; 2977 unsigned long* os::Bsd::_numa_all_nodes; 2978 #endif 2979 2980 bool os::uncommit_memory(char* addr, size_t size) { 2981 #ifdef __OpenBSD__ 2982 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2983 return ::mprotect(addr, size, PROT_NONE) == 0; 2984 #else 2985 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2986 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2987 return res != (uintptr_t) MAP_FAILED; 2988 #endif 2989 } 2990 2991 bool os::create_stack_guard_pages(char* addr, size_t size) { 2992 return os::commit_memory(addr, size); 2993 } 2994 2995 // If this is a growable mapping, remove the guard pages entirely by 2996 // munmap()ping them. If not, just call uncommit_memory(). 2997 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2998 return os::uncommit_memory(addr, size); 2999 } 3000 3001 static address _highest_vm_reserved_address = NULL; 3002 3003 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 3004 // at 'requested_addr'. If there are existing memory mappings at the same 3005 // location, however, they will be overwritten. If 'fixed' is false, 3006 // 'requested_addr' is only treated as a hint, the return value may or 3007 // may not start from the requested address. Unlike Bsd mmap(), this 3008 // function returns NULL to indicate failure. 3009 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 3010 char * addr; 3011 int flags; 3012 3013 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 3014 if (fixed) { 3015 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 3016 flags |= MAP_FIXED; 3017 } 3018 3019 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 3020 // to PROT_EXEC if executable when we commit the page. 3021 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 3022 flags, -1, 0); 3023 3024 if (addr != MAP_FAILED) { 3025 // anon_mmap() should only get called during VM initialization, 3026 // don't need lock (actually we can skip locking even it can be called 3027 // from multiple threads, because _highest_vm_reserved_address is just a 3028 // hint about the upper limit of non-stack memory regions.) 3029 if ((address)addr + bytes > _highest_vm_reserved_address) { 3030 _highest_vm_reserved_address = (address)addr + bytes; 3031 } 3032 } 3033 3034 return addr == MAP_FAILED ? NULL : addr; 3035 } 3036 3037 // Don't update _highest_vm_reserved_address, because there might be memory 3038 // regions above addr + size. If so, releasing a memory region only creates 3039 // a hole in the address space, it doesn't help prevent heap-stack collision. 3040 // 3041 static int anon_munmap(char * addr, size_t size) { 3042 return ::munmap(addr, size) == 0; 3043 } 3044 3045 char* os::reserve_memory(size_t bytes, char* requested_addr, 3046 size_t alignment_hint) { 3047 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 3048 } 3049 3050 bool os::release_memory(char* addr, size_t size) { 3051 return anon_munmap(addr, size); 3052 } 3053 3054 static address highest_vm_reserved_address() { 3055 return _highest_vm_reserved_address; 3056 } 3057 3058 static bool bsd_mprotect(char* addr, size_t size, int prot) { 3059 // Bsd wants the mprotect address argument to be page aligned. 3060 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 3061 3062 // According to SUSv3, mprotect() should only be used with mappings 3063 // established by mmap(), and mmap() always maps whole pages. Unaligned 3064 // 'addr' likely indicates problem in the VM (e.g. trying to change 3065 // protection of malloc'ed or statically allocated memory). Check the 3066 // caller if you hit this assert. 3067 assert(addr == bottom, "sanity check"); 3068 3069 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 3070 return ::mprotect(bottom, size, prot) == 0; 3071 } 3072 3073 // Set protections specified 3074 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3075 bool is_committed) { 3076 unsigned int p = 0; 3077 switch (prot) { 3078 case MEM_PROT_NONE: p = PROT_NONE; break; 3079 case MEM_PROT_READ: p = PROT_READ; break; 3080 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3081 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3082 default: 3083 ShouldNotReachHere(); 3084 } 3085 // is_committed is unused. 3086 return bsd_mprotect(addr, bytes, p); 3087 } 3088 3089 bool os::guard_memory(char* addr, size_t size) { 3090 return bsd_mprotect(addr, size, PROT_NONE); 3091 } 3092 3093 bool os::unguard_memory(char* addr, size_t size) { 3094 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 3095 } 3096 3097 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 3098 bool result = false; 3099 #ifndef _ALLBSD_SOURCE 3100 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, 3101 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, 3102 -1, 0); 3103 3104 if (p != (void *) -1) { 3105 // We don't know if this really is a huge page or not. 3106 FILE *fp = fopen("/proc/self/maps", "r"); 3107 if (fp) { 3108 while (!feof(fp)) { 3109 char chars[257]; 3110 long x = 0; 3111 if (fgets(chars, sizeof(chars), fp)) { 3112 if (sscanf(chars, "%lx-%*x", &x) == 1 3113 && x == (long)p) { 3114 if (strstr (chars, "hugepage")) { 3115 result = true; 3116 break; 3117 } 3118 } 3119 } 3120 } 3121 fclose(fp); 3122 } 3123 munmap (p, page_size); 3124 if (result) 3125 return true; 3126 } 3127 3128 if (warn) { 3129 warning("HugeTLBFS is not supported by the operating system."); 3130 } 3131 #endif 3132 3133 return result; 3134 } 3135 3136 /* 3137 * Set the coredump_filter bits to include largepages in core dump (bit 6) 3138 * 3139 * From the coredump_filter documentation: 3140 * 3141 * - (bit 0) anonymous private memory 3142 * - (bit 1) anonymous shared memory 3143 * - (bit 2) file-backed private memory 3144 * - (bit 3) file-backed shared memory 3145 * - (bit 4) ELF header pages in file-backed private memory areas (it is 3146 * effective only if the bit 2 is cleared) 3147 * - (bit 5) hugetlb private memory 3148 * - (bit 6) hugetlb shared memory 3149 */ 3150 static void set_coredump_filter(void) { 3151 FILE *f; 3152 long cdm; 3153 3154 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 3155 return; 3156 } 3157 3158 if (fscanf(f, "%lx", &cdm) != 1) { 3159 fclose(f); 3160 return; 3161 } 3162 3163 rewind(f); 3164 3165 if ((cdm & LARGEPAGES_BIT) == 0) { 3166 cdm |= LARGEPAGES_BIT; 3167 fprintf(f, "%#lx", cdm); 3168 } 3169 3170 fclose(f); 3171 } 3172 3173 // Large page support 3174 3175 static size_t _large_page_size = 0; 3176 3177 void os::large_page_init() { 3178 #ifndef _ALLBSD_SOURCE 3179 if (!UseLargePages) { 3180 UseHugeTLBFS = false; 3181 UseSHM = false; 3182 return; 3183 } 3184 3185 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { 3186 // If UseLargePages is specified on the command line try both methods, 3187 // if it's default, then try only HugeTLBFS. 3188 if (FLAG_IS_DEFAULT(UseLargePages)) { 3189 UseHugeTLBFS = true; 3190 } else { 3191 UseHugeTLBFS = UseSHM = true; 3192 } 3193 } 3194 3195 if (LargePageSizeInBytes) { 3196 _large_page_size = LargePageSizeInBytes; 3197 } else { 3198 // large_page_size on Bsd is used to round up heap size. x86 uses either 3199 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) 3200 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use 3201 // page as large as 256M. 3202 // 3203 // Here we try to figure out page size by parsing /proc/meminfo and looking 3204 // for a line with the following format: 3205 // Hugepagesize: 2048 kB 3206 // 3207 // If we can't determine the value (e.g. /proc is not mounted, or the text 3208 // format has been changed), we'll use the largest page size supported by 3209 // the processor. 3210 3211 #ifndef ZERO 3212 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) 3213 ARM_ONLY(2 * M) PPC_ONLY(4 * M); 3214 #endif // ZERO 3215 3216 FILE *fp = fopen("/proc/meminfo", "r"); 3217 if (fp) { 3218 while (!feof(fp)) { 3219 int x = 0; 3220 char buf[16]; 3221 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { 3222 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { 3223 _large_page_size = x * K; 3224 break; 3225 } 3226 } else { 3227 // skip to next line 3228 for (;;) { 3229 int ch = fgetc(fp); 3230 if (ch == EOF || ch == (int)'\n') break; 3231 } 3232 } 3233 } 3234 fclose(fp); 3235 } 3236 } 3237 3238 // print a warning if any large page related flag is specified on command line 3239 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); 3240 3241 const size_t default_page_size = (size_t)Bsd::page_size(); 3242 if (_large_page_size > default_page_size) { 3243 _page_sizes[0] = _large_page_size; 3244 _page_sizes[1] = default_page_size; 3245 _page_sizes[2] = 0; 3246 } 3247 UseHugeTLBFS = UseHugeTLBFS && 3248 Bsd::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); 3249 3250 if (UseHugeTLBFS) 3251 UseSHM = false; 3252 3253 UseLargePages = UseHugeTLBFS || UseSHM; 3254 3255 set_coredump_filter(); 3256 #endif 3257 } 3258 3259 #ifndef _ALLBSD_SOURCE 3260 #ifndef SHM_HUGETLB 3261 #define SHM_HUGETLB 04000 3262 #endif 3263 #endif 3264 3265 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 3266 // "exec" is passed in but not used. Creating the shared image for 3267 // the code cache doesn't have an SHM_X executable permission to check. 3268 assert(UseLargePages && UseSHM, "only for SHM large pages"); 3269 3270 key_t key = IPC_PRIVATE; 3271 char *addr; 3272 3273 bool warn_on_failure = UseLargePages && 3274 (!FLAG_IS_DEFAULT(UseLargePages) || 3275 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3276 ); 3277 char msg[128]; 3278 3279 // Create a large shared memory region to attach to based on size. 3280 // Currently, size is the total size of the heap 3281 #ifndef _ALLBSD_SOURCE 3282 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); 3283 #else 3284 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 3285 #endif 3286 if (shmid == -1) { 3287 // Possible reasons for shmget failure: 3288 // 1. shmmax is too small for Java heap. 3289 // > check shmmax value: cat /proc/sys/kernel/shmmax 3290 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 3291 // 2. not enough large page memory. 3292 // > check available large pages: cat /proc/meminfo 3293 // > increase amount of large pages: 3294 // echo new_value > /proc/sys/vm/nr_hugepages 3295 // Note 1: different Bsd may use different name for this property, 3296 // e.g. on Redhat AS-3 it is "hugetlb_pool". 3297 // Note 2: it's possible there's enough physical memory available but 3298 // they are so fragmented after a long run that they can't 3299 // coalesce into large pages. Try to reserve large pages when 3300 // the system is still "fresh". 3301 if (warn_on_failure) { 3302 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3303 warning(msg); 3304 } 3305 return NULL; 3306 } 3307 3308 // attach to the region 3309 addr = (char*)shmat(shmid, req_addr, 0); 3310 int err = errno; 3311 3312 // Remove shmid. If shmat() is successful, the actual shared memory segment 3313 // will be deleted when it's detached by shmdt() or when the process 3314 // terminates. If shmat() is not successful this will remove the shared 3315 // segment immediately. 3316 shmctl(shmid, IPC_RMID, NULL); 3317 3318 if ((intptr_t)addr == -1) { 3319 if (warn_on_failure) { 3320 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3321 warning(msg); 3322 } 3323 return NULL; 3324 } 3325 3326 return addr; 3327 } 3328 3329 bool os::release_memory_special(char* base, size_t bytes) { 3330 // detaching the SHM segment will also delete it, see reserve_memory_special() 3331 int rslt = shmdt(base); 3332 return rslt == 0; 3333 } 3334 3335 size_t os::large_page_size() { 3336 return _large_page_size; 3337 } 3338 3339 // HugeTLBFS allows application to commit large page memory on demand; 3340 // with SysV SHM the entire memory region must be allocated as shared 3341 // memory. 3342 bool os::can_commit_large_page_memory() { 3343 return UseHugeTLBFS; 3344 } 3345 3346 bool os::can_execute_large_page_memory() { 3347 return UseHugeTLBFS; 3348 } 3349 3350 // Reserve memory at an arbitrary address, only if that area is 3351 // available (and not reserved for something else). 3352 3353 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3354 const int max_tries = 10; 3355 char* base[max_tries]; 3356 size_t size[max_tries]; 3357 const size_t gap = 0x000000; 3358 3359 // Assert only that the size is a multiple of the page size, since 3360 // that's all that mmap requires, and since that's all we really know 3361 // about at this low abstraction level. If we need higher alignment, 3362 // we can either pass an alignment to this method or verify alignment 3363 // in one of the methods further up the call chain. See bug 5044738. 3364 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3365 3366 // Repeatedly allocate blocks until the block is allocated at the 3367 // right spot. Give up after max_tries. Note that reserve_memory() will 3368 // automatically update _highest_vm_reserved_address if the call is 3369 // successful. The variable tracks the highest memory address every reserved 3370 // by JVM. It is used to detect heap-stack collision if running with 3371 // fixed-stack BsdThreads. Because here we may attempt to reserve more 3372 // space than needed, it could confuse the collision detecting code. To 3373 // solve the problem, save current _highest_vm_reserved_address and 3374 // calculate the correct value before return. 3375 address old_highest = _highest_vm_reserved_address; 3376 3377 // Bsd mmap allows caller to pass an address as hint; give it a try first, 3378 // if kernel honors the hint then we can return immediately. 3379 char * addr = anon_mmap(requested_addr, bytes, false); 3380 if (addr == requested_addr) { 3381 return requested_addr; 3382 } 3383 3384 if (addr != NULL) { 3385 // mmap() is successful but it fails to reserve at the requested address 3386 anon_munmap(addr, bytes); 3387 } 3388 3389 int i; 3390 for (i = 0; i < max_tries; ++i) { 3391 base[i] = reserve_memory(bytes); 3392 3393 if (base[i] != NULL) { 3394 // Is this the block we wanted? 3395 if (base[i] == requested_addr) { 3396 size[i] = bytes; 3397 break; 3398 } 3399 3400 // Does this overlap the block we wanted? Give back the overlapped 3401 // parts and try again. 3402 3403 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3404 if (top_overlap >= 0 && top_overlap < bytes) { 3405 unmap_memory(base[i], top_overlap); 3406 base[i] += top_overlap; 3407 size[i] = bytes - top_overlap; 3408 } else { 3409 size_t bottom_overlap = base[i] + bytes - requested_addr; 3410 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3411 unmap_memory(requested_addr, bottom_overlap); 3412 size[i] = bytes - bottom_overlap; 3413 } else { 3414 size[i] = bytes; 3415 } 3416 } 3417 } 3418 } 3419 3420 // Give back the unused reserved pieces. 3421 3422 for (int j = 0; j < i; ++j) { 3423 if (base[j] != NULL) { 3424 unmap_memory(base[j], size[j]); 3425 } 3426 } 3427 3428 if (i < max_tries) { 3429 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 3430 return requested_addr; 3431 } else { 3432 _highest_vm_reserved_address = old_highest; 3433 return NULL; 3434 } 3435 } 3436 3437 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3438 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 3439 } 3440 3441 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 3442 // Solaris uses poll(), bsd uses park(). 3443 // Poll() is likely a better choice, assuming that Thread.interrupt() 3444 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 3445 // SIGSEGV, see 4355769. 3446 3447 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3448 assert(thread == Thread::current(), "thread consistency check"); 3449 3450 ParkEvent * const slp = thread->_SleepEvent ; 3451 slp->reset() ; 3452 OrderAccess::fence() ; 3453 3454 if (interruptible) { 3455 jlong prevtime = javaTimeNanos(); 3456 3457 for (;;) { 3458 if (os::is_interrupted(thread, true)) { 3459 return OS_INTRPT; 3460 } 3461 3462 jlong newtime = javaTimeNanos(); 3463 3464 if (newtime - prevtime < 0) { 3465 // time moving backwards, should only happen if no monotonic clock 3466 // not a guarantee() because JVM should not abort on kernel/glibc bugs 3467 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 3468 } else { 3469 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 3470 } 3471 3472 if(millis <= 0) { 3473 return OS_OK; 3474 } 3475 3476 prevtime = newtime; 3477 3478 { 3479 assert(thread->is_Java_thread(), "sanity check"); 3480 JavaThread *jt = (JavaThread *) thread; 3481 ThreadBlockInVM tbivm(jt); 3482 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3483 3484 jt->set_suspend_equivalent(); 3485 // cleared by handle_special_suspend_equivalent_condition() or 3486 // java_suspend_self() via check_and_wait_while_suspended() 3487 3488 slp->park(millis); 3489 3490 // were we externally suspended while we were waiting? 3491 jt->check_and_wait_while_suspended(); 3492 } 3493 } 3494 } else { 3495 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3496 jlong prevtime = javaTimeNanos(); 3497 3498 for (;;) { 3499 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 3500 // the 1st iteration ... 3501 jlong newtime = javaTimeNanos(); 3502 3503 if (newtime - prevtime < 0) { 3504 // time moving backwards, should only happen if no monotonic clock 3505 // not a guarantee() because JVM should not abort on kernel/glibc bugs 3506 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 3507 } else { 3508 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 3509 } 3510 3511 if(millis <= 0) break ; 3512 3513 prevtime = newtime; 3514 slp->park(millis); 3515 } 3516 return OS_OK ; 3517 } 3518 } 3519 3520 int os::naked_sleep() { 3521 // %% make the sleep time an integer flag. for now use 1 millisec. 3522 return os::sleep(Thread::current(), 1, false); 3523 } 3524 3525 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3526 void os::infinite_sleep() { 3527 while (true) { // sleep forever ... 3528 ::sleep(100); // ... 100 seconds at a time 3529 } 3530 } 3531 3532 // Used to convert frequent JVM_Yield() to nops 3533 bool os::dont_yield() { 3534 return DontYieldALot; 3535 } 3536 3537 void os::yield() { 3538 sched_yield(); 3539 } 3540 3541 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 3542 3543 void os::yield_all(int attempts) { 3544 // Yields to all threads, including threads with lower priorities 3545 // Threads on Bsd are all with same priority. The Solaris style 3546 // os::yield_all() with nanosleep(1ms) is not necessary. 3547 sched_yield(); 3548 } 3549 3550 // Called from the tight loops to possibly influence time-sharing heuristics 3551 void os::loop_breaker(int attempts) { 3552 os::yield_all(attempts); 3553 } 3554 3555 //////////////////////////////////////////////////////////////////////////////// 3556 // thread priority support 3557 3558 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 3559 // only supports dynamic priority, static priority must be zero. For real-time 3560 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 3561 // However, for large multi-threaded applications, SCHED_RR is not only slower 3562 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 3563 // of 5 runs - Sep 2005). 3564 // 3565 // The following code actually changes the niceness of kernel-thread/LWP. It 3566 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 3567 // not the entire user process, and user level threads are 1:1 mapped to kernel 3568 // threads. It has always been the case, but could change in the future. For 3569 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 3570 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 3571 3572 #if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) 3573 int os::java_to_os_priority[MaxPriority + 1] = { 3574 19, // 0 Entry should never be used 3575 3576 0, // 1 MinPriority 3577 3, // 2 3578 6, // 3 3579 3580 10, // 4 3581 15, // 5 NormPriority 3582 18, // 6 3583 3584 21, // 7 3585 25, // 8 3586 28, // 9 NearMaxPriority 3587 3588 31 // 10 MaxPriority 3589 }; 3590 #elif defined(__APPLE__) 3591 /* Using Mach high-level priority assignments */ 3592 int os::java_to_os_priority[MaxPriority + 1] = { 3593 0, // 0 Entry should never be used (MINPRI_USER) 3594 3595 27, // 1 MinPriority 3596 28, // 2 3597 29, // 3 3598 3599 30, // 4 3600 31, // 5 NormPriority (BASEPRI_DEFAULT) 3601 32, // 6 3602 3603 33, // 7 3604 34, // 8 3605 35, // 9 NearMaxPriority 3606 3607 36 // 10 MaxPriority 3608 }; 3609 #else 3610 int os::java_to_os_priority[MaxPriority + 1] = { 3611 19, // 0 Entry should never be used 3612 3613 4, // 1 MinPriority 3614 3, // 2 3615 2, // 3 3616 3617 1, // 4 3618 0, // 5 NormPriority 3619 -1, // 6 3620 3621 -2, // 7 3622 -3, // 8 3623 -4, // 9 NearMaxPriority 3624 3625 -5 // 10 MaxPriority 3626 }; 3627 #endif 3628 3629 static int prio_init() { 3630 if (ThreadPriorityPolicy == 1) { 3631 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 3632 // if effective uid is not root. Perhaps, a more elegant way of doing 3633 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 3634 if (geteuid() != 0) { 3635 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 3636 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 3637 } 3638 ThreadPriorityPolicy = 0; 3639 } 3640 } 3641 return 0; 3642 } 3643 3644 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3645 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 3646 3647 #ifdef __OpenBSD__ 3648 // OpenBSD pthread_setprio starves low priority threads 3649 return OS_OK; 3650 #elif defined(__FreeBSD__) 3651 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 3652 #elif defined(__APPLE__) || defined(__NetBSD__) 3653 struct sched_param sp; 3654 int policy; 3655 pthread_t self = pthread_self(); 3656 3657 if (pthread_getschedparam(self, &policy, &sp) != 0) 3658 return OS_ERR; 3659 3660 sp.sched_priority = newpri; 3661 if (pthread_setschedparam(self, policy, &sp) != 0) 3662 return OS_ERR; 3663 3664 return OS_OK; 3665 #else 3666 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 3667 return (ret == 0) ? OS_OK : OS_ERR; 3668 #endif 3669 } 3670 3671 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 3672 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 3673 *priority_ptr = java_to_os_priority[NormPriority]; 3674 return OS_OK; 3675 } 3676 3677 errno = 0; 3678 #if defined(__OpenBSD__) || defined(__FreeBSD__) 3679 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 3680 #elif defined(__APPLE__) || defined(__NetBSD__) 3681 int policy; 3682 struct sched_param sp; 3683 3684 pthread_getschedparam(pthread_self(), &policy, &sp); 3685 *priority_ptr = sp.sched_priority; 3686 #else 3687 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 3688 #endif 3689 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 3690 } 3691 3692 // Hint to the underlying OS that a task switch would not be good. 3693 // Void return because it's a hint and can fail. 3694 void os::hint_no_preempt() {} 3695 3696 //////////////////////////////////////////////////////////////////////////////// 3697 // suspend/resume support 3698 3699 // the low-level signal-based suspend/resume support is a remnant from the 3700 // old VM-suspension that used to be for java-suspension, safepoints etc, 3701 // within hotspot. Now there is a single use-case for this: 3702 // - calling get_thread_pc() on the VMThread by the flat-profiler task 3703 // that runs in the watcher thread. 3704 // The remaining code is greatly simplified from the more general suspension 3705 // code that used to be used. 3706 // 3707 // The protocol is quite simple: 3708 // - suspend: 3709 // - sends a signal to the target thread 3710 // - polls the suspend state of the osthread using a yield loop 3711 // - target thread signal handler (SR_handler) sets suspend state 3712 // and blocks in sigsuspend until continued 3713 // - resume: 3714 // - sets target osthread state to continue 3715 // - sends signal to end the sigsuspend loop in the SR_handler 3716 // 3717 // Note that the SR_lock plays no role in this suspend/resume protocol. 3718 // 3719 3720 static void resume_clear_context(OSThread *osthread) { 3721 osthread->set_ucontext(NULL); 3722 osthread->set_siginfo(NULL); 3723 3724 // notify the suspend action is completed, we have now resumed 3725 osthread->sr.clear_suspended(); 3726 } 3727 3728 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 3729 osthread->set_ucontext(context); 3730 osthread->set_siginfo(siginfo); 3731 } 3732 3733 // 3734 // Handler function invoked when a thread's execution is suspended or 3735 // resumed. We have to be careful that only async-safe functions are 3736 // called here (Note: most pthread functions are not async safe and 3737 // should be avoided.) 3738 // 3739 // Note: sigwait() is a more natural fit than sigsuspend() from an 3740 // interface point of view, but sigwait() prevents the signal hander 3741 // from being run. libpthread would get very confused by not having 3742 // its signal handlers run and prevents sigwait()'s use with the 3743 // mutex granting granting signal. 3744 // 3745 // Currently only ever called on the VMThread 3746 // 3747 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 3748 // Save and restore errno to avoid confusing native code with EINTR 3749 // after sigsuspend. 3750 int old_errno = errno; 3751 3752 Thread* thread = Thread::current(); 3753 OSThread* osthread = thread->osthread(); 3754 assert(thread->is_VM_thread(), "Must be VMThread"); 3755 // read current suspend action 3756 int action = osthread->sr.suspend_action(); 3757 if (action == SR_SUSPEND) { 3758 suspend_save_context(osthread, siginfo, context); 3759 3760 // Notify the suspend action is about to be completed. do_suspend() 3761 // waits until SR_SUSPENDED is set and then returns. We will wait 3762 // here for a resume signal and that completes the suspend-other 3763 // action. do_suspend/do_resume is always called as a pair from 3764 // the same thread - so there are no races 3765 3766 // notify the caller 3767 osthread->sr.set_suspended(); 3768 3769 sigset_t suspend_set; // signals for sigsuspend() 3770 3771 // get current set of blocked signals and unblock resume signal 3772 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3773 sigdelset(&suspend_set, SR_signum); 3774 3775 // wait here until we are resumed 3776 do { 3777 sigsuspend(&suspend_set); 3778 // ignore all returns until we get a resume signal 3779 } while (osthread->sr.suspend_action() != SR_CONTINUE); 3780 3781 resume_clear_context(osthread); 3782 3783 } else { 3784 assert(action == SR_CONTINUE, "unexpected sr action"); 3785 // nothing special to do - just leave the handler 3786 } 3787 3788 errno = old_errno; 3789 } 3790 3791 3792 static int SR_initialize() { 3793 struct sigaction act; 3794 char *s; 3795 /* Get signal number to use for suspend/resume */ 3796 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 3797 int sig = ::strtol(s, 0, 10); 3798 if (sig > 0 || sig < NSIG) { 3799 SR_signum = sig; 3800 } 3801 } 3802 3803 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 3804 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 3805 3806 sigemptyset(&SR_sigset); 3807 sigaddset(&SR_sigset, SR_signum); 3808 3809 /* Set up signal handler for suspend/resume */ 3810 act.sa_flags = SA_RESTART|SA_SIGINFO; 3811 act.sa_handler = (void (*)(int)) SR_handler; 3812 3813 // SR_signum is blocked by default. 3814 // 4528190 - We also need to block pthread restart signal (32 on all 3815 // supported Bsd platforms). Note that BsdThreads need to block 3816 // this signal for all threads to work properly. So we don't have 3817 // to use hard-coded signal number when setting up the mask. 3818 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 3819 3820 if (sigaction(SR_signum, &act, 0) == -1) { 3821 return -1; 3822 } 3823 3824 // Save signal flag 3825 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 3826 return 0; 3827 } 3828 3829 static int SR_finalize() { 3830 return 0; 3831 } 3832 3833 3834 // returns true on success and false on error - really an error is fatal 3835 // but this seems the normal response to library errors 3836 static bool do_suspend(OSThread* osthread) { 3837 // mark as suspended and send signal 3838 osthread->sr.set_suspend_action(SR_SUSPEND); 3839 int status = pthread_kill(osthread->pthread_id(), SR_signum); 3840 assert_status(status == 0, status, "pthread_kill"); 3841 3842 // check status and wait until notified of suspension 3843 if (status == 0) { 3844 for (int i = 0; !osthread->sr.is_suspended(); i++) { 3845 os::yield_all(i); 3846 } 3847 osthread->sr.set_suspend_action(SR_NONE); 3848 return true; 3849 } 3850 else { 3851 osthread->sr.set_suspend_action(SR_NONE); 3852 return false; 3853 } 3854 } 3855 3856 static void do_resume(OSThread* osthread) { 3857 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3858 osthread->sr.set_suspend_action(SR_CONTINUE); 3859 3860 int status = pthread_kill(osthread->pthread_id(), SR_signum); 3861 assert_status(status == 0, status, "pthread_kill"); 3862 // check status and wait unit notified of resumption 3863 if (status == 0) { 3864 for (int i = 0; osthread->sr.is_suspended(); i++) { 3865 os::yield_all(i); 3866 } 3867 } 3868 osthread->sr.set_suspend_action(SR_NONE); 3869 } 3870 3871 //////////////////////////////////////////////////////////////////////////////// 3872 // interrupt support 3873 3874 void os::interrupt(Thread* thread) { 3875 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3876 "possibility of dangling Thread pointer"); 3877 3878 OSThread* osthread = thread->osthread(); 3879 3880 if (!osthread->interrupted()) { 3881 osthread->set_interrupted(true); 3882 // More than one thread can get here with the same value of osthread, 3883 // resulting in multiple notifications. We do, however, want the store 3884 // to interrupted() to be visible to other threads before we execute unpark(). 3885 OrderAccess::fence(); 3886 ParkEvent * const slp = thread->_SleepEvent ; 3887 if (slp != NULL) slp->unpark() ; 3888 } 3889 3890 // For JSR166. Unpark even if interrupt status already was set 3891 if (thread->is_Java_thread()) 3892 ((JavaThread*)thread)->parker()->unpark(); 3893 3894 ParkEvent * ev = thread->_ParkEvent ; 3895 if (ev != NULL) ev->unpark() ; 3896 3897 } 3898 3899 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3900 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3901 "possibility of dangling Thread pointer"); 3902 3903 OSThread* osthread = thread->osthread(); 3904 3905 bool interrupted = osthread->interrupted(); 3906 3907 if (interrupted && clear_interrupted) { 3908 osthread->set_interrupted(false); 3909 // consider thread->_SleepEvent->reset() ... optional optimization 3910 } 3911 3912 return interrupted; 3913 } 3914 3915 /////////////////////////////////////////////////////////////////////////////////// 3916 // signal handling (except suspend/resume) 3917 3918 // This routine may be used by user applications as a "hook" to catch signals. 3919 // The user-defined signal handler must pass unrecognized signals to this 3920 // routine, and if it returns true (non-zero), then the signal handler must 3921 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3922 // routine will never retun false (zero), but instead will execute a VM panic 3923 // routine kill the process. 3924 // 3925 // If this routine returns false, it is OK to call it again. This allows 3926 // the user-defined signal handler to perform checks either before or after 3927 // the VM performs its own checks. Naturally, the user code would be making 3928 // a serious error if it tried to handle an exception (such as a null check 3929 // or breakpoint) that the VM was generating for its own correct operation. 3930 // 3931 // This routine may recognize any of the following kinds of signals: 3932 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 3933 // It should be consulted by handlers for any of those signals. 3934 // 3935 // The caller of this routine must pass in the three arguments supplied 3936 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3937 // field of the structure passed to sigaction(). This routine assumes that 3938 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3939 // 3940 // Note that the VM will print warnings if it detects conflicting signal 3941 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3942 // 3943 extern "C" JNIEXPORT int 3944 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 3945 void* ucontext, int abort_if_unrecognized); 3946 3947 void signalHandler(int sig, siginfo_t* info, void* uc) { 3948 assert(info != NULL && uc != NULL, "it must be old kernel"); 3949 JVM_handle_bsd_signal(sig, info, uc, true); 3950 } 3951 3952 3953 // This boolean allows users to forward their own non-matching signals 3954 // to JVM_handle_bsd_signal, harmlessly. 3955 bool os::Bsd::signal_handlers_are_installed = false; 3956 3957 // For signal-chaining 3958 struct sigaction os::Bsd::sigact[MAXSIGNUM]; 3959 unsigned int os::Bsd::sigs = 0; 3960 bool os::Bsd::libjsig_is_loaded = false; 3961 typedef struct sigaction *(*get_signal_t)(int); 3962 get_signal_t os::Bsd::get_signal_action = NULL; 3963 3964 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 3965 struct sigaction *actp = NULL; 3966 3967 if (libjsig_is_loaded) { 3968 // Retrieve the old signal handler from libjsig 3969 actp = (*get_signal_action)(sig); 3970 } 3971 if (actp == NULL) { 3972 // Retrieve the preinstalled signal handler from jvm 3973 actp = get_preinstalled_handler(sig); 3974 } 3975 3976 return actp; 3977 } 3978 3979 static bool call_chained_handler(struct sigaction *actp, int sig, 3980 siginfo_t *siginfo, void *context) { 3981 // Call the old signal handler 3982 if (actp->sa_handler == SIG_DFL) { 3983 // It's more reasonable to let jvm treat it as an unexpected exception 3984 // instead of taking the default action. 3985 return false; 3986 } else if (actp->sa_handler != SIG_IGN) { 3987 if ((actp->sa_flags & SA_NODEFER) == 0) { 3988 // automaticlly block the signal 3989 sigaddset(&(actp->sa_mask), sig); 3990 } 3991 3992 sa_handler_t hand; 3993 sa_sigaction_t sa; 3994 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3995 // retrieve the chained handler 3996 if (siginfo_flag_set) { 3997 sa = actp->sa_sigaction; 3998 } else { 3999 hand = actp->sa_handler; 4000 } 4001 4002 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4003 actp->sa_handler = SIG_DFL; 4004 } 4005 4006 // try to honor the signal mask 4007 sigset_t oset; 4008 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4009 4010 // call into the chained handler 4011 if (siginfo_flag_set) { 4012 (*sa)(sig, siginfo, context); 4013 } else { 4014 (*hand)(sig); 4015 } 4016 4017 // restore the signal mask 4018 pthread_sigmask(SIG_SETMASK, &oset, 0); 4019 } 4020 // Tell jvm's signal handler the signal is taken care of. 4021 return true; 4022 } 4023 4024 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4025 bool chained = false; 4026 // signal-chaining 4027 if (UseSignalChaining) { 4028 struct sigaction *actp = get_chained_signal_action(sig); 4029 if (actp != NULL) { 4030 chained = call_chained_handler(actp, sig, siginfo, context); 4031 } 4032 } 4033 return chained; 4034 } 4035 4036 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 4037 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 4038 return &sigact[sig]; 4039 } 4040 return NULL; 4041 } 4042 4043 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4044 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4045 sigact[sig] = oldAct; 4046 sigs |= (unsigned int)1 << sig; 4047 } 4048 4049 // for diagnostic 4050 int os::Bsd::sigflags[MAXSIGNUM]; 4051 4052 int os::Bsd::get_our_sigflags(int sig) { 4053 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4054 return sigflags[sig]; 4055 } 4056 4057 void os::Bsd::set_our_sigflags(int sig, int flags) { 4058 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4059 sigflags[sig] = flags; 4060 } 4061 4062 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 4063 // Check for overwrite. 4064 struct sigaction oldAct; 4065 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4066 4067 void* oldhand = oldAct.sa_sigaction 4068 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4069 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4070 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4071 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4072 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 4073 if (AllowUserSignalHandlers || !set_installed) { 4074 // Do not overwrite; user takes responsibility to forward to us. 4075 return; 4076 } else if (UseSignalChaining) { 4077 // save the old handler in jvm 4078 save_preinstalled_handler(sig, oldAct); 4079 // libjsig also interposes the sigaction() call below and saves the 4080 // old sigaction on it own. 4081 } else { 4082 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4083 "%#lx for signal %d.", (long)oldhand, sig)); 4084 } 4085 } 4086 4087 struct sigaction sigAct; 4088 sigfillset(&(sigAct.sa_mask)); 4089 sigAct.sa_handler = SIG_DFL; 4090 if (!set_installed) { 4091 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 4092 } else { 4093 sigAct.sa_sigaction = signalHandler; 4094 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 4095 } 4096 // Save flags, which are set by ours 4097 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4098 sigflags[sig] = sigAct.sa_flags; 4099 4100 int ret = sigaction(sig, &sigAct, &oldAct); 4101 assert(ret == 0, "check"); 4102 4103 void* oldhand2 = oldAct.sa_sigaction 4104 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4105 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4106 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4107 } 4108 4109 // install signal handlers for signals that HotSpot needs to 4110 // handle in order to support Java-level exception handling. 4111 4112 void os::Bsd::install_signal_handlers() { 4113 if (!signal_handlers_are_installed) { 4114 signal_handlers_are_installed = true; 4115 4116 // signal-chaining 4117 typedef void (*signal_setting_t)(); 4118 signal_setting_t begin_signal_setting = NULL; 4119 signal_setting_t end_signal_setting = NULL; 4120 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4121 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4122 if (begin_signal_setting != NULL) { 4123 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4124 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4125 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4126 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4127 libjsig_is_loaded = true; 4128 assert(UseSignalChaining, "should enable signal-chaining"); 4129 } 4130 if (libjsig_is_loaded) { 4131 // Tell libjsig jvm is setting signal handlers 4132 (*begin_signal_setting)(); 4133 } 4134 4135 set_signal_handler(SIGSEGV, true); 4136 set_signal_handler(SIGPIPE, true); 4137 set_signal_handler(SIGBUS, true); 4138 set_signal_handler(SIGILL, true); 4139 set_signal_handler(SIGFPE, true); 4140 set_signal_handler(SIGXFSZ, true); 4141 4142 #if defined(__APPLE__) 4143 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 4144 // signals caught and handled by the JVM. To work around this, we reset the mach task 4145 // signal handler that's placed on our process by CrashReporter. This disables 4146 // CrashReporter-based reporting. 4147 // 4148 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 4149 // on caught fatal signals. 4150 // 4151 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 4152 // handlers. By replacing the existing task exception handler, we disable gdb's mach 4153 // exception handling, while leaving the standard BSD signal handlers functional. 4154 kern_return_t kr; 4155 kr = task_set_exception_ports(mach_task_self(), 4156 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 4157 MACH_PORT_NULL, 4158 EXCEPTION_STATE_IDENTITY, 4159 MACHINE_THREAD_STATE); 4160 4161 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 4162 #endif 4163 4164 if (libjsig_is_loaded) { 4165 // Tell libjsig jvm finishes setting signal handlers 4166 (*end_signal_setting)(); 4167 } 4168 4169 // We don't activate signal checker if libjsig is in place, we trust ourselves 4170 // and if UserSignalHandler is installed all bets are off 4171 if (CheckJNICalls) { 4172 if (libjsig_is_loaded) { 4173 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4174 check_signals = false; 4175 } 4176 if (AllowUserSignalHandlers) { 4177 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4178 check_signals = false; 4179 } 4180 } 4181 } 4182 } 4183 4184 #ifndef _ALLBSD_SOURCE 4185 // This is the fastest way to get thread cpu time on Bsd. 4186 // Returns cpu time (user+sys) for any thread, not only for current. 4187 // POSIX compliant clocks are implemented in the kernels 2.6.16+. 4188 // It might work on 2.6.10+ with a special kernel/glibc patch. 4189 // For reference, please, see IEEE Std 1003.1-2004: 4190 // http://www.unix.org/single_unix_specification 4191 4192 jlong os::Bsd::fast_thread_cpu_time(clockid_t clockid) { 4193 struct timespec tp; 4194 int rc = os::Bsd::clock_gettime(clockid, &tp); 4195 assert(rc == 0, "clock_gettime is expected to return 0 code"); 4196 4197 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; 4198 } 4199 #endif 4200 4201 ///// 4202 // glibc on Bsd platform uses non-documented flag 4203 // to indicate, that some special sort of signal 4204 // trampoline is used. 4205 // We will never set this flag, and we should 4206 // ignore this flag in our diagnostic 4207 #ifdef SIGNIFICANT_SIGNAL_MASK 4208 #undef SIGNIFICANT_SIGNAL_MASK 4209 #endif 4210 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 4211 4212 static const char* get_signal_handler_name(address handler, 4213 char* buf, int buflen) { 4214 int offset; 4215 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 4216 if (found) { 4217 // skip directory names 4218 const char *p1, *p2; 4219 p1 = buf; 4220 size_t len = strlen(os::file_separator()); 4221 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 4222 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 4223 } else { 4224 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 4225 } 4226 return buf; 4227 } 4228 4229 static void print_signal_handler(outputStream* st, int sig, 4230 char* buf, size_t buflen) { 4231 struct sigaction sa; 4232 4233 sigaction(sig, NULL, &sa); 4234 4235 // See comment for SIGNIFICANT_SIGNAL_MASK define 4236 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 4237 4238 st->print("%s: ", os::exception_name(sig, buf, buflen)); 4239 4240 address handler = (sa.sa_flags & SA_SIGINFO) 4241 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 4242 : CAST_FROM_FN_PTR(address, sa.sa_handler); 4243 4244 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 4245 st->print("SIG_DFL"); 4246 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 4247 st->print("SIG_IGN"); 4248 } else { 4249 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 4250 } 4251 4252 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 4253 4254 address rh = VMError::get_resetted_sighandler(sig); 4255 // May be, handler was resetted by VMError? 4256 if(rh != NULL) { 4257 handler = rh; 4258 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 4259 } 4260 4261 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 4262 4263 // Check: is it our handler? 4264 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 4265 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 4266 // It is our signal handler 4267 // check for flags, reset system-used one! 4268 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 4269 st->print( 4270 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 4271 os::Bsd::get_our_sigflags(sig)); 4272 } 4273 } 4274 st->cr(); 4275 } 4276 4277 4278 #define DO_SIGNAL_CHECK(sig) \ 4279 if (!sigismember(&check_signal_done, sig)) \ 4280 os::Bsd::check_signal_handler(sig) 4281 4282 // This method is a periodic task to check for misbehaving JNI applications 4283 // under CheckJNI, we can add any periodic checks here 4284 4285 void os::run_periodic_checks() { 4286 4287 if (check_signals == false) return; 4288 4289 // SEGV and BUS if overridden could potentially prevent 4290 // generation of hs*.log in the event of a crash, debugging 4291 // such a case can be very challenging, so we absolutely 4292 // check the following for a good measure: 4293 DO_SIGNAL_CHECK(SIGSEGV); 4294 DO_SIGNAL_CHECK(SIGILL); 4295 DO_SIGNAL_CHECK(SIGFPE); 4296 DO_SIGNAL_CHECK(SIGBUS); 4297 DO_SIGNAL_CHECK(SIGPIPE); 4298 DO_SIGNAL_CHECK(SIGXFSZ); 4299 4300 4301 // ReduceSignalUsage allows the user to override these handlers 4302 // see comments at the very top and jvm_solaris.h 4303 if (!ReduceSignalUsage) { 4304 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4305 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4306 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4307 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4308 } 4309 4310 DO_SIGNAL_CHECK(SR_signum); 4311 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 4312 } 4313 4314 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4315 4316 static os_sigaction_t os_sigaction = NULL; 4317 4318 void os::Bsd::check_signal_handler(int sig) { 4319 char buf[O_BUFLEN]; 4320 address jvmHandler = NULL; 4321 4322 4323 struct sigaction act; 4324 if (os_sigaction == NULL) { 4325 // only trust the default sigaction, in case it has been interposed 4326 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4327 if (os_sigaction == NULL) return; 4328 } 4329 4330 os_sigaction(sig, (struct sigaction*)NULL, &act); 4331 4332 4333 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 4334 4335 address thisHandler = (act.sa_flags & SA_SIGINFO) 4336 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4337 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4338 4339 4340 switch(sig) { 4341 case SIGSEGV: 4342 case SIGBUS: 4343 case SIGFPE: 4344 case SIGPIPE: 4345 case SIGILL: 4346 case SIGXFSZ: 4347 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 4348 break; 4349 4350 case SHUTDOWN1_SIGNAL: 4351 case SHUTDOWN2_SIGNAL: 4352 case SHUTDOWN3_SIGNAL: 4353 case BREAK_SIGNAL: 4354 jvmHandler = (address)user_handler(); 4355 break; 4356 4357 case INTERRUPT_SIGNAL: 4358 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 4359 break; 4360 4361 default: 4362 if (sig == SR_signum) { 4363 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 4364 } else { 4365 return; 4366 } 4367 break; 4368 } 4369 4370 if (thisHandler != jvmHandler) { 4371 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4372 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4373 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4374 // No need to check this sig any longer 4375 sigaddset(&check_signal_done, sig); 4376 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 4377 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4378 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 4379 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4380 // No need to check this sig any longer 4381 sigaddset(&check_signal_done, sig); 4382 } 4383 4384 // Dump all the signal 4385 if (sigismember(&check_signal_done, sig)) { 4386 print_signal_handlers(tty, buf, O_BUFLEN); 4387 } 4388 } 4389 4390 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 4391 4392 extern bool signal_name(int signo, char* buf, size_t len); 4393 4394 const char* os::exception_name(int exception_code, char* buf, size_t size) { 4395 if (0 < exception_code && exception_code <= SIGRTMAX) { 4396 // signal 4397 if (!signal_name(exception_code, buf, size)) { 4398 jio_snprintf(buf, size, "SIG%d", exception_code); 4399 } 4400 return buf; 4401 } else { 4402 return NULL; 4403 } 4404 } 4405 4406 // this is called _before_ the most of global arguments have been parsed 4407 void os::init(void) { 4408 char dummy; /* used to get a guess on initial stack address */ 4409 // first_hrtime = gethrtime(); 4410 4411 // With BsdThreads the JavaMain thread pid (primordial thread) 4412 // is different than the pid of the java launcher thread. 4413 // So, on Bsd, the launcher thread pid is passed to the VM 4414 // via the sun.java.launcher.pid property. 4415 // Use this property instead of getpid() if it was correctly passed. 4416 // See bug 6351349. 4417 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 4418 4419 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 4420 4421 clock_tics_per_sec = CLK_TCK; 4422 4423 init_random(1234567); 4424 4425 ThreadCritical::initialize(); 4426 4427 Bsd::set_page_size(getpagesize()); 4428 if (Bsd::page_size() == -1) { 4429 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 4430 strerror(errno))); 4431 } 4432 init_page_sizes((size_t) Bsd::page_size()); 4433 4434 Bsd::initialize_system_info(); 4435 4436 // main_thread points to the aboriginal thread 4437 Bsd::_main_thread = pthread_self(); 4438 4439 Bsd::clock_init(); 4440 initial_time_count = os::elapsed_counter(); 4441 4442 #ifdef __APPLE__ 4443 // XXXDARWIN 4444 // Work around the unaligned VM callbacks in hotspot's 4445 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 4446 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 4447 // alignment when doing symbol lookup. To work around this, we force early 4448 // binding of all symbols now, thus binding when alignment is known-good. 4449 _dyld_bind_fully_image_containing_address((const void *) &os::init); 4450 #endif 4451 } 4452 4453 // To install functions for atexit system call 4454 extern "C" { 4455 static void perfMemory_exit_helper() { 4456 perfMemory_exit(); 4457 } 4458 } 4459 4460 // this is called _after_ the global arguments have been parsed 4461 jint os::init_2(void) 4462 { 4463 #ifndef _ALLBSD_SOURCE 4464 Bsd::fast_thread_clock_init(); 4465 #endif 4466 4467 // Allocate a single page and mark it as readable for safepoint polling 4468 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 4469 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 4470 4471 os::set_polling_page( polling_page ); 4472 4473 #ifndef PRODUCT 4474 if(Verbose && PrintMiscellaneous) 4475 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 4476 #endif 4477 4478 if (!UseMembar) { 4479 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 4480 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4481 os::set_memory_serialize_page( mem_serialize_page ); 4482 4483 #ifndef PRODUCT 4484 if(Verbose && PrintMiscellaneous) 4485 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 4486 #endif 4487 } 4488 4489 os::large_page_init(); 4490 4491 // initialize suspend/resume support - must do this before signal_sets_init() 4492 if (SR_initialize() != 0) { 4493 perror("SR_initialize failed"); 4494 return JNI_ERR; 4495 } 4496 4497 Bsd::signal_sets_init(); 4498 Bsd::install_signal_handlers(); 4499 4500 // Check minimum allowable stack size for thread creation and to initialize 4501 // the java system classes, including StackOverflowError - depends on page 4502 // size. Add a page for compiler2 recursion in main thread. 4503 // Add in 2*BytesPerWord times page size to account for VM stack during 4504 // class initialization depending on 32 or 64 bit VM. 4505 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 4506 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4507 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 4508 4509 size_t threadStackSizeInBytes = ThreadStackSize * K; 4510 if (threadStackSizeInBytes != 0 && 4511 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 4512 tty->print_cr("\nThe stack size specified is too small, " 4513 "Specify at least %dk", 4514 os::Bsd::min_stack_allowed/ K); 4515 return JNI_ERR; 4516 } 4517 4518 // Make the stack size a multiple of the page size so that 4519 // the yellow/red zones can be guarded. 4520 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4521 vm_page_size())); 4522 4523 #ifndef _ALLBSD_SOURCE 4524 Bsd::capture_initial_stack(JavaThread::stack_size_at_create()); 4525 4526 Bsd::libpthread_init(); 4527 if (PrintMiscellaneous && (Verbose || WizardMode)) { 4528 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", 4529 Bsd::glibc_version(), Bsd::libpthread_version(), 4530 Bsd::is_floating_stack() ? "floating stack" : "fixed stack"); 4531 } 4532 4533 if (UseNUMA) { 4534 if (!Bsd::libnuma_init()) { 4535 UseNUMA = false; 4536 } else { 4537 if ((Bsd::numa_max_node() < 1)) { 4538 // There's only one node(they start from 0), disable NUMA. 4539 UseNUMA = false; 4540 } 4541 } 4542 // With SHM large pages we cannot uncommit a page, so there's not way 4543 // we can make the adaptive lgrp chunk resizing work. If the user specified 4544 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and 4545 // disable adaptive resizing. 4546 if (UseNUMA && UseLargePages && UseSHM) { 4547 if (!FLAG_IS_DEFAULT(UseNUMA)) { 4548 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) { 4549 UseLargePages = false; 4550 } else { 4551 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing"); 4552 UseAdaptiveSizePolicy = false; 4553 UseAdaptiveNUMAChunkSizing = false; 4554 } 4555 } else { 4556 UseNUMA = false; 4557 } 4558 } 4559 if (!UseNUMA && ForceNUMA) { 4560 UseNUMA = true; 4561 } 4562 } 4563 #endif 4564 4565 if (MaxFDLimit) { 4566 // set the number of file descriptors to max. print out error 4567 // if getrlimit/setrlimit fails but continue regardless. 4568 struct rlimit nbr_files; 4569 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4570 if (status != 0) { 4571 if (PrintMiscellaneous && (Verbose || WizardMode)) 4572 perror("os::init_2 getrlimit failed"); 4573 } else { 4574 nbr_files.rlim_cur = nbr_files.rlim_max; 4575 4576 #ifdef __APPLE__ 4577 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 4578 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 4579 // be used instead 4580 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 4581 #endif 4582 4583 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4584 if (status != 0) { 4585 if (PrintMiscellaneous && (Verbose || WizardMode)) 4586 perror("os::init_2 setrlimit failed"); 4587 } 4588 } 4589 } 4590 4591 #ifndef _ALLBSD_SOURCE 4592 // Initialize lock used to serialize thread creation (see os::create_thread) 4593 Bsd::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); 4594 #endif 4595 4596 // at-exit methods are called in the reverse order of their registration. 4597 // atexit functions are called on return from main or as a result of a 4598 // call to exit(3C). There can be only 32 of these functions registered 4599 // and atexit() does not set errno. 4600 4601 if (PerfAllowAtExitRegistration) { 4602 // only register atexit functions if PerfAllowAtExitRegistration is set. 4603 // atexit functions can be delayed until process exit time, which 4604 // can be problematic for embedded VM situations. Embedded VMs should 4605 // call DestroyJavaVM() to assure that VM resources are released. 4606 4607 // note: perfMemory_exit_helper atexit function may be removed in 4608 // the future if the appropriate cleanup code can be added to the 4609 // VM_Exit VMOperation's doit method. 4610 if (atexit(perfMemory_exit_helper) != 0) { 4611 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4612 } 4613 } 4614 4615 // initialize thread priority policy 4616 prio_init(); 4617 4618 #ifdef __APPLE__ 4619 // dynamically link to objective c gc registration 4620 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 4621 if (handleLibObjc != NULL) { 4622 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 4623 } 4624 #endif 4625 4626 return JNI_OK; 4627 } 4628 4629 // this is called at the end of vm_initialization 4630 void os::init_3(void) { } 4631 4632 // Mark the polling page as unreadable 4633 void os::make_polling_page_unreadable(void) { 4634 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 4635 fatal("Could not disable polling page"); 4636 }; 4637 4638 // Mark the polling page as readable 4639 void os::make_polling_page_readable(void) { 4640 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 4641 fatal("Could not enable polling page"); 4642 } 4643 }; 4644 4645 int os::active_processor_count() { 4646 #ifdef _ALLBSD_SOURCE 4647 return _processor_count; 4648 #else 4649 // Bsd doesn't yet have a (official) notion of processor sets, 4650 // so just return the number of online processors. 4651 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 4652 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 4653 return online_cpus; 4654 #endif 4655 } 4656 4657 void os::set_native_thread_name(const char *name) { 4658 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 4659 // This is only supported in Snow Leopard and beyond 4660 if (name != NULL) { 4661 // Add a "Java: " prefix to the name 4662 char buf[MAXTHREADNAMESIZE]; 4663 snprintf(buf, sizeof(buf), "Java: %s", name); 4664 pthread_setname_np(buf); 4665 } 4666 #endif 4667 } 4668 4669 bool os::distribute_processes(uint length, uint* distribution) { 4670 // Not yet implemented. 4671 return false; 4672 } 4673 4674 bool os::bind_to_processor(uint processor_id) { 4675 // Not yet implemented. 4676 return false; 4677 } 4678 4679 /// 4680 4681 // Suspends the target using the signal mechanism and then grabs the PC before 4682 // resuming the target. Used by the flat-profiler only 4683 ExtendedPC os::get_thread_pc(Thread* thread) { 4684 // Make sure that it is called by the watcher for the VMThread 4685 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 4686 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4687 4688 ExtendedPC epc; 4689 4690 OSThread* osthread = thread->osthread(); 4691 if (do_suspend(osthread)) { 4692 if (osthread->ucontext() != NULL) { 4693 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 4694 } else { 4695 // NULL context is unexpected, double-check this is the VMThread 4696 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 4697 } 4698 do_resume(osthread); 4699 } 4700 // failure means pthread_kill failed for some reason - arguably this is 4701 // a fatal problem, but such problems are ignored elsewhere 4702 4703 return epc; 4704 } 4705 4706 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 4707 { 4708 #ifdef _ALLBSD_SOURCE 4709 return pthread_cond_timedwait(_cond, _mutex, _abstime); 4710 #else 4711 if (is_NPTL()) { 4712 return pthread_cond_timedwait(_cond, _mutex, _abstime); 4713 } else { 4714 #ifndef IA64 4715 // 6292965: BsdThreads pthread_cond_timedwait() resets FPU control 4716 // word back to default 64bit precision if condvar is signaled. Java 4717 // wants 53bit precision. Save and restore current value. 4718 int fpu = get_fpu_control_word(); 4719 #endif // IA64 4720 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); 4721 #ifndef IA64 4722 set_fpu_control_word(fpu); 4723 #endif // IA64 4724 return status; 4725 } 4726 #endif 4727 } 4728 4729 //////////////////////////////////////////////////////////////////////////////// 4730 // debug support 4731 4732 static address same_page(address x, address y) { 4733 int page_bits = -os::vm_page_size(); 4734 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 4735 return x; 4736 else if (x > y) 4737 return (address)(intptr_t(y) | ~page_bits) + 1; 4738 else 4739 return (address)(intptr_t(y) & page_bits); 4740 } 4741 4742 bool os::find(address addr, outputStream* st) { 4743 Dl_info dlinfo; 4744 memset(&dlinfo, 0, sizeof(dlinfo)); 4745 if (dladdr(addr, &dlinfo)) { 4746 st->print(PTR_FORMAT ": ", addr); 4747 if (dlinfo.dli_sname != NULL) { 4748 st->print("%s+%#x", dlinfo.dli_sname, 4749 addr - (intptr_t)dlinfo.dli_saddr); 4750 } else if (dlinfo.dli_fname) { 4751 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 4752 } else { 4753 st->print("<absolute address>"); 4754 } 4755 if (dlinfo.dli_fname) { 4756 st->print(" in %s", dlinfo.dli_fname); 4757 } 4758 if (dlinfo.dli_fbase) { 4759 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4760 } 4761 st->cr(); 4762 4763 if (Verbose) { 4764 // decode some bytes around the PC 4765 address begin = same_page(addr-40, addr); 4766 address end = same_page(addr+40, addr); 4767 address lowest = (address) dlinfo.dli_sname; 4768 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4769 if (begin < lowest) begin = lowest; 4770 Dl_info dlinfo2; 4771 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 4772 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 4773 end = (address) dlinfo2.dli_saddr; 4774 Disassembler::decode(begin, end, st); 4775 } 4776 return true; 4777 } 4778 return false; 4779 } 4780 4781 //////////////////////////////////////////////////////////////////////////////// 4782 // misc 4783 4784 // This does not do anything on Bsd. This is basically a hook for being 4785 // able to use structured exception handling (thread-local exception filters) 4786 // on, e.g., Win32. 4787 void 4788 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 4789 JavaCallArguments* args, Thread* thread) { 4790 f(value, method, args, thread); 4791 } 4792 4793 void os::print_statistics() { 4794 } 4795 4796 int os::message_box(const char* title, const char* message) { 4797 int i; 4798 fdStream err(defaultStream::error_fd()); 4799 for (i = 0; i < 78; i++) err.print_raw("="); 4800 err.cr(); 4801 err.print_raw_cr(title); 4802 for (i = 0; i < 78; i++) err.print_raw("-"); 4803 err.cr(); 4804 err.print_raw_cr(message); 4805 for (i = 0; i < 78; i++) err.print_raw("="); 4806 err.cr(); 4807 4808 char buf[16]; 4809 // Prevent process from exiting upon "read error" without consuming all CPU 4810 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4811 4812 return buf[0] == 'y' || buf[0] == 'Y'; 4813 } 4814 4815 int os::stat(const char *path, struct stat *sbuf) { 4816 char pathbuf[MAX_PATH]; 4817 if (strlen(path) > MAX_PATH - 1) { 4818 errno = ENAMETOOLONG; 4819 return -1; 4820 } 4821 os::native_path(strcpy(pathbuf, path)); 4822 return ::stat(pathbuf, sbuf); 4823 } 4824 4825 bool os::check_heap(bool force) { 4826 return true; 4827 } 4828 4829 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 4830 return ::vsnprintf(buf, count, format, args); 4831 } 4832 4833 // Is a (classpath) directory empty? 4834 bool os::dir_is_empty(const char* path) { 4835 DIR *dir = NULL; 4836 struct dirent *ptr; 4837 4838 dir = opendir(path); 4839 if (dir == NULL) return true; 4840 4841 /* Scan the directory */ 4842 bool result = true; 4843 char buf[sizeof(struct dirent) + MAX_PATH]; 4844 while (result && (ptr = ::readdir(dir)) != NULL) { 4845 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4846 result = false; 4847 } 4848 } 4849 closedir(dir); 4850 return result; 4851 } 4852 4853 // This code originates from JDK's sysOpen and open64_w 4854 // from src/solaris/hpi/src/system_md.c 4855 4856 #ifndef O_DELETE 4857 #define O_DELETE 0x10000 4858 #endif 4859 4860 // Open a file. Unlink the file immediately after open returns 4861 // if the specified oflag has the O_DELETE flag set. 4862 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 4863 4864 int os::open(const char *path, int oflag, int mode) { 4865 4866 if (strlen(path) > MAX_PATH - 1) { 4867 errno = ENAMETOOLONG; 4868 return -1; 4869 } 4870 int fd; 4871 int o_delete = (oflag & O_DELETE); 4872 oflag = oflag & ~O_DELETE; 4873 4874 fd = ::open(path, oflag, mode); 4875 if (fd == -1) return -1; 4876 4877 //If the open succeeded, the file might still be a directory 4878 { 4879 struct stat buf; 4880 int ret = ::fstat(fd, &buf); 4881 int st_mode = buf.st_mode; 4882 4883 if (ret != -1) { 4884 if ((st_mode & S_IFMT) == S_IFDIR) { 4885 errno = EISDIR; 4886 ::close(fd); 4887 return -1; 4888 } 4889 } else { 4890 ::close(fd); 4891 return -1; 4892 } 4893 } 4894 4895 /* 4896 * All file descriptors that are opened in the JVM and not 4897 * specifically destined for a subprocess should have the 4898 * close-on-exec flag set. If we don't set it, then careless 3rd 4899 * party native code might fork and exec without closing all 4900 * appropriate file descriptors (e.g. as we do in closeDescriptors in 4901 * UNIXProcess.c), and this in turn might: 4902 * 4903 * - cause end-of-file to fail to be detected on some file 4904 * descriptors, resulting in mysterious hangs, or 4905 * 4906 * - might cause an fopen in the subprocess to fail on a system 4907 * suffering from bug 1085341. 4908 * 4909 * (Yes, the default setting of the close-on-exec flag is a Unix 4910 * design flaw) 4911 * 4912 * See: 4913 * 1085341: 32-bit stdio routines should support file descriptors >255 4914 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4915 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4916 */ 4917 #ifdef FD_CLOEXEC 4918 { 4919 int flags = ::fcntl(fd, F_GETFD); 4920 if (flags != -1) 4921 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4922 } 4923 #endif 4924 4925 if (o_delete != 0) { 4926 ::unlink(path); 4927 } 4928 return fd; 4929 } 4930 4931 4932 // create binary file, rewriting existing file if required 4933 int os::create_binary_file(const char* path, bool rewrite_existing) { 4934 int oflags = O_WRONLY | O_CREAT; 4935 if (!rewrite_existing) { 4936 oflags |= O_EXCL; 4937 } 4938 return ::open(path, oflags, S_IREAD | S_IWRITE); 4939 } 4940 4941 // return current position of file pointer 4942 jlong os::current_file_offset(int fd) { 4943 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 4944 } 4945 4946 // move file pointer to the specified offset 4947 jlong os::seek_to_file_offset(int fd, jlong offset) { 4948 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 4949 } 4950 4951 // This code originates from JDK's sysAvailable 4952 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 4953 4954 int os::available(int fd, jlong *bytes) { 4955 jlong cur, end; 4956 int mode; 4957 struct stat buf; 4958 4959 if (::fstat(fd, &buf) >= 0) { 4960 mode = buf.st_mode; 4961 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4962 /* 4963 * XXX: is the following call interruptible? If so, this might 4964 * need to go through the INTERRUPT_IO() wrapper as for other 4965 * blocking, interruptible calls in this file. 4966 */ 4967 int n; 4968 if (::ioctl(fd, FIONREAD, &n) >= 0) { 4969 *bytes = n; 4970 return 1; 4971 } 4972 } 4973 } 4974 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 4975 return 0; 4976 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 4977 return 0; 4978 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 4979 return 0; 4980 } 4981 *bytes = end - cur; 4982 return 1; 4983 } 4984 4985 int os::socket_available(int fd, jint *pbytes) { 4986 if (fd < 0) 4987 return OS_OK; 4988 4989 int ret; 4990 4991 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 4992 4993 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 4994 // is expected to return 0 on failure and 1 on success to the jdk. 4995 4996 return (ret == OS_ERR) ? 0 : 1; 4997 } 4998 4999 // Map a block of memory. 5000 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 5001 char *addr, size_t bytes, bool read_only, 5002 bool allow_exec) { 5003 int prot; 5004 int flags; 5005 5006 if (read_only) { 5007 prot = PROT_READ; 5008 flags = MAP_SHARED; 5009 } else { 5010 prot = PROT_READ | PROT_WRITE; 5011 flags = MAP_PRIVATE; 5012 } 5013 5014 if (allow_exec) { 5015 prot |= PROT_EXEC; 5016 } 5017 5018 if (addr != NULL) { 5019 flags |= MAP_FIXED; 5020 } 5021 5022 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5023 fd, file_offset); 5024 if (mapped_address == MAP_FAILED) { 5025 return NULL; 5026 } 5027 return mapped_address; 5028 } 5029 5030 5031 // Remap a block of memory. 5032 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 5033 char *addr, size_t bytes, bool read_only, 5034 bool allow_exec) { 5035 // same as map_memory() on this OS 5036 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5037 allow_exec); 5038 } 5039 5040 5041 // Unmap a block of memory. 5042 bool os::unmap_memory(char* addr, size_t bytes) { 5043 return munmap(addr, bytes) == 0; 5044 } 5045 5046 #ifndef _ALLBSD_SOURCE 5047 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); 5048 5049 static clockid_t thread_cpu_clockid(Thread* thread) { 5050 pthread_t tid = thread->osthread()->pthread_id(); 5051 clockid_t clockid; 5052 5053 // Get thread clockid 5054 int rc = os::Bsd::pthread_getcpuclockid(tid, &clockid); 5055 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); 5056 return clockid; 5057 } 5058 #endif 5059 5060 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5061 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 5062 // of a thread. 5063 // 5064 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 5065 // the fast estimate available on the platform. 5066 5067 jlong os::current_thread_cpu_time() { 5068 #ifdef __APPLE__ 5069 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 5070 #elif !defined(_ALLBSD_SOURCE) 5071 if (os::Bsd::supports_fast_thread_cpu_time()) { 5072 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); 5073 } else { 5074 // return user + sys since the cost is the same 5075 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); 5076 } 5077 #endif 5078 } 5079 5080 jlong os::thread_cpu_time(Thread* thread) { 5081 #ifndef _ALLBSD_SOURCE 5082 // consistent with what current_thread_cpu_time() returns 5083 if (os::Bsd::supports_fast_thread_cpu_time()) { 5084 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); 5085 } else { 5086 return slow_thread_cpu_time(thread, true /* user + sys */); 5087 } 5088 #endif 5089 } 5090 5091 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5092 #ifdef __APPLE__ 5093 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5094 #elif !defined(_ALLBSD_SOURCE) 5095 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { 5096 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); 5097 } else { 5098 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); 5099 } 5100 #endif 5101 } 5102 5103 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5104 #ifdef __APPLE__ 5105 struct thread_basic_info tinfo; 5106 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 5107 kern_return_t kr; 5108 mach_port_t mach_thread; 5109 5110 mach_thread = pthread_mach_thread_np(thread->osthread()->thread_id()); 5111 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 5112 if (kr != KERN_SUCCESS) 5113 return -1; 5114 5115 if (user_sys_cpu_time) { 5116 jlong nanos; 5117 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 5118 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 5119 return nanos; 5120 } else { 5121 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 5122 } 5123 #elif !defined(_ALLBSD_SOURCE) 5124 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { 5125 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); 5126 } else { 5127 return slow_thread_cpu_time(thread, user_sys_cpu_time); 5128 } 5129 #endif 5130 } 5131 5132 #ifndef _ALLBSD_SOURCE 5133 // 5134 // -1 on error. 5135 // 5136 5137 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5138 static bool proc_pid_cpu_avail = true; 5139 static bool proc_task_unchecked = true; 5140 static const char *proc_stat_path = "/proc/%d/stat"; 5141 pid_t tid = thread->osthread()->thread_id(); 5142 int i; 5143 char *s; 5144 char stat[2048]; 5145 int statlen; 5146 char proc_name[64]; 5147 int count; 5148 long sys_time, user_time; 5149 char string[64]; 5150 char cdummy; 5151 int idummy; 5152 long ldummy; 5153 FILE *fp; 5154 5155 // We first try accessing /proc/<pid>/cpu since this is faster to 5156 // process. If this file is not present (bsd kernels 2.5 and above) 5157 // then we open /proc/<pid>/stat. 5158 if ( proc_pid_cpu_avail ) { 5159 sprintf(proc_name, "/proc/%d/cpu", tid); 5160 fp = fopen(proc_name, "r"); 5161 if ( fp != NULL ) { 5162 count = fscanf( fp, "%s %lu %lu\n", string, &user_time, &sys_time); 5163 fclose(fp); 5164 if ( count != 3 ) return -1; 5165 5166 if (user_sys_cpu_time) { 5167 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); 5168 } else { 5169 return (jlong)user_time * (1000000000 / clock_tics_per_sec); 5170 } 5171 } 5172 else proc_pid_cpu_avail = false; 5173 } 5174 5175 // The /proc/<tid>/stat aggregates per-process usage on 5176 // new Bsd kernels 2.6+ where NPTL is supported. 5177 // The /proc/self/task/<tid>/stat still has the per-thread usage. 5178 // See bug 6328462. 5179 // There can be no directory /proc/self/task on kernels 2.4 with NPTL 5180 // and possibly in some other cases, so we check its availability. 5181 if (proc_task_unchecked && os::Bsd::is_NPTL()) { 5182 // This is executed only once 5183 proc_task_unchecked = false; 5184 fp = fopen("/proc/self/task", "r"); 5185 if (fp != NULL) { 5186 proc_stat_path = "/proc/self/task/%d/stat"; 5187 fclose(fp); 5188 } 5189 } 5190 5191 sprintf(proc_name, proc_stat_path, tid); 5192 fp = fopen(proc_name, "r"); 5193 if ( fp == NULL ) return -1; 5194 statlen = fread(stat, 1, 2047, fp); 5195 stat[statlen] = '\0'; 5196 fclose(fp); 5197 5198 // Skip pid and the command string. Note that we could be dealing with 5199 // weird command names, e.g. user could decide to rename java launcher 5200 // to "java 1.4.2 :)", then the stat file would look like 5201 // 1234 (java 1.4.2 :)) R ... ... 5202 // We don't really need to know the command string, just find the last 5203 // occurrence of ")" and then start parsing from there. See bug 4726580. 5204 s = strrchr(stat, ')'); 5205 i = 0; 5206 if (s == NULL ) return -1; 5207 5208 // Skip blank chars 5209 do s++; while (isspace(*s)); 5210 5211 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", 5212 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, 5213 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, 5214 &user_time, &sys_time); 5215 if ( count != 13 ) return -1; 5216 if (user_sys_cpu_time) { 5217 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); 5218 } else { 5219 return (jlong)user_time * (1000000000 / clock_tics_per_sec); 5220 } 5221 } 5222 #endif 5223 5224 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5225 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5226 info_ptr->may_skip_backward = false; // elapsed time not wall time 5227 info_ptr->may_skip_forward = false; // elapsed time not wall time 5228 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 5229 } 5230 5231 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5232 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5233 info_ptr->may_skip_backward = false; // elapsed time not wall time 5234 info_ptr->may_skip_forward = false; // elapsed time not wall time 5235 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 5236 } 5237 5238 bool os::is_thread_cpu_time_supported() { 5239 #ifdef __APPLE__ 5240 return true; 5241 #elif defined(_ALLBSD_SOURCE) 5242 return false; 5243 #else 5244 return true; 5245 #endif 5246 } 5247 5248 // System loadavg support. Returns -1 if load average cannot be obtained. 5249 // Bsd doesn't yet have a (official) notion of processor sets, 5250 // so just return the system wide load average. 5251 int os::loadavg(double loadavg[], int nelem) { 5252 return ::getloadavg(loadavg, nelem); 5253 } 5254 5255 void os::pause() { 5256 char filename[MAX_PATH]; 5257 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5258 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5259 } else { 5260 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5261 } 5262 5263 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5264 if (fd != -1) { 5265 struct stat buf; 5266 ::close(fd); 5267 while (::stat(filename, &buf) == 0) { 5268 (void)::poll(NULL, 0, 100); 5269 } 5270 } else { 5271 jio_fprintf(stderr, 5272 "Could not open pause file '%s', continuing immediately.\n", filename); 5273 } 5274 } 5275 5276 5277 // Refer to the comments in os_solaris.cpp park-unpark. 5278 // 5279 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 5280 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 5281 // For specifics regarding the bug see GLIBC BUGID 261237 : 5282 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 5283 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 5284 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 5285 // is used. (The simple C test-case provided in the GLIBC bug report manifests the 5286 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 5287 // and monitorenter when we're using 1-0 locking. All those operations may result in 5288 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 5289 // of libpthread avoids the problem, but isn't practical. 5290 // 5291 // Possible remedies: 5292 // 5293 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 5294 // This is palliative and probabilistic, however. If the thread is preempted 5295 // between the call to compute_abstime() and pthread_cond_timedwait(), more 5296 // than the minimum period may have passed, and the abstime may be stale (in the 5297 // past) resultin in a hang. Using this technique reduces the odds of a hang 5298 // but the JVM is still vulnerable, particularly on heavily loaded systems. 5299 // 5300 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 5301 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set 5302 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 5303 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant 5304 // thread. 5305 // 5306 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 5307 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 5308 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). 5309 // This also works well. In fact it avoids kernel-level scalability impediments 5310 // on certain platforms that don't handle lots of active pthread_cond_timedwait() 5311 // timers in a graceful fashion. 5312 // 5313 // 4. When the abstime value is in the past it appears that control returns 5314 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 5315 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we 5316 // can avoid the problem by reinitializing the condvar -- by cond_destroy() 5317 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). 5318 // It may be possible to avoid reinitialization by checking the return 5319 // value from pthread_cond_timedwait(). In addition to reinitializing the 5320 // condvar we must establish the invariant that cond_signal() is only called 5321 // within critical sections protected by the adjunct mutex. This prevents 5322 // cond_signal() from "seeing" a condvar that's in the midst of being 5323 // reinitialized or that is corrupt. Sadly, this invariant obviates the 5324 // desirable signal-after-unlock optimization that avoids futile context switching. 5325 // 5326 // I'm also concerned that some versions of NTPL might allocate an auxilliary 5327 // structure when a condvar is used or initialized. cond_destroy() would 5328 // release the helper structure. Our reinitialize-after-timedwait fix 5329 // put excessive stress on malloc/free and locks protecting the c-heap. 5330 // 5331 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 5332 // It may be possible to refine (4) by checking the kernel and NTPL verisons 5333 // and only enabling the work-around for vulnerable environments. 5334 5335 // utility to compute the abstime argument to timedwait: 5336 // millis is the relative timeout time 5337 // abstime will be the absolute timeout time 5338 // TODO: replace compute_abstime() with unpackTime() 5339 5340 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 5341 if (millis < 0) millis = 0; 5342 struct timeval now; 5343 int status = gettimeofday(&now, NULL); 5344 assert(status == 0, "gettimeofday"); 5345 jlong seconds = millis / 1000; 5346 millis %= 1000; 5347 if (seconds > 50000000) { // see man cond_timedwait(3T) 5348 seconds = 50000000; 5349 } 5350 abstime->tv_sec = now.tv_sec + seconds; 5351 long usec = now.tv_usec + millis * 1000; 5352 if (usec >= 1000000) { 5353 abstime->tv_sec += 1; 5354 usec -= 1000000; 5355 } 5356 abstime->tv_nsec = usec * 1000; 5357 return abstime; 5358 } 5359 5360 5361 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5362 // Conceptually TryPark() should be equivalent to park(0). 5363 5364 int os::PlatformEvent::TryPark() { 5365 for (;;) { 5366 const int v = _Event ; 5367 guarantee ((v == 0) || (v == 1), "invariant") ; 5368 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5369 } 5370 } 5371 5372 void os::PlatformEvent::park() { // AKA "down()" 5373 // Invariant: Only the thread associated with the Event/PlatformEvent 5374 // may call park(). 5375 // TODO: assert that _Assoc != NULL or _Assoc == Self 5376 int v ; 5377 for (;;) { 5378 v = _Event ; 5379 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5380 } 5381 guarantee (v >= 0, "invariant") ; 5382 if (v == 0) { 5383 // Do this the hard way by blocking ... 5384 int status = pthread_mutex_lock(_mutex); 5385 assert_status(status == 0, status, "mutex_lock"); 5386 guarantee (_nParked == 0, "invariant") ; 5387 ++ _nParked ; 5388 while (_Event < 0) { 5389 status = pthread_cond_wait(_cond, _mutex); 5390 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5391 // Treat this the same as if the wait was interrupted 5392 if (status == ETIMEDOUT) { status = EINTR; } 5393 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5394 } 5395 -- _nParked ; 5396 5397 // In theory we could move the ST of 0 into _Event past the unlock(), 5398 // but then we'd need a MEMBAR after the ST. 5399 _Event = 0 ; 5400 status = pthread_mutex_unlock(_mutex); 5401 assert_status(status == 0, status, "mutex_unlock"); 5402 } 5403 guarantee (_Event >= 0, "invariant") ; 5404 } 5405 5406 int os::PlatformEvent::park(jlong millis) { 5407 guarantee (_nParked == 0, "invariant") ; 5408 5409 int v ; 5410 for (;;) { 5411 v = _Event ; 5412 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5413 } 5414 guarantee (v >= 0, "invariant") ; 5415 if (v != 0) return OS_OK ; 5416 5417 // We do this the hard way, by blocking the thread. 5418 // Consider enforcing a minimum timeout value. 5419 struct timespec abst; 5420 compute_abstime(&abst, millis); 5421 5422 int ret = OS_TIMEOUT; 5423 int status = pthread_mutex_lock(_mutex); 5424 assert_status(status == 0, status, "mutex_lock"); 5425 guarantee (_nParked == 0, "invariant") ; 5426 ++_nParked ; 5427 5428 // Object.wait(timo) will return because of 5429 // (a) notification 5430 // (b) timeout 5431 // (c) thread.interrupt 5432 // 5433 // Thread.interrupt and object.notify{All} both call Event::set. 5434 // That is, we treat thread.interrupt as a special case of notification. 5435 // The underlying Solaris implementation, cond_timedwait, admits 5436 // spurious/premature wakeups, but the JLS/JVM spec prevents the 5437 // JVM from making those visible to Java code. As such, we must 5438 // filter out spurious wakeups. We assume all ETIME returns are valid. 5439 // 5440 // TODO: properly differentiate simultaneous notify+interrupt. 5441 // In that case, we should propagate the notify to another waiter. 5442 5443 while (_Event < 0) { 5444 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 5445 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 5446 pthread_cond_destroy (_cond); 5447 pthread_cond_init (_cond, NULL) ; 5448 } 5449 assert_status(status == 0 || status == EINTR || 5450 status == ETIMEDOUT, 5451 status, "cond_timedwait"); 5452 if (!FilterSpuriousWakeups) break ; // previous semantics 5453 if (status == ETIMEDOUT) break ; 5454 // We consume and ignore EINTR and spurious wakeups. 5455 } 5456 --_nParked ; 5457 if (_Event >= 0) { 5458 ret = OS_OK; 5459 } 5460 _Event = 0 ; 5461 status = pthread_mutex_unlock(_mutex); 5462 assert_status(status == 0, status, "mutex_unlock"); 5463 assert (_nParked == 0, "invariant") ; 5464 return ret; 5465 } 5466 5467 void os::PlatformEvent::unpark() { 5468 int v, AnyWaiters ; 5469 for (;;) { 5470 v = _Event ; 5471 if (v > 0) { 5472 // The LD of _Event could have reordered or be satisfied 5473 // by a read-aside from this processor's write buffer. 5474 // To avoid problems execute a barrier and then 5475 // ratify the value. 5476 OrderAccess::fence() ; 5477 if (_Event == v) return ; 5478 continue ; 5479 } 5480 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 5481 } 5482 if (v < 0) { 5483 // Wait for the thread associated with the event to vacate 5484 int status = pthread_mutex_lock(_mutex); 5485 assert_status(status == 0, status, "mutex_lock"); 5486 AnyWaiters = _nParked ; 5487 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 5488 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 5489 AnyWaiters = 0 ; 5490 pthread_cond_signal (_cond); 5491 } 5492 status = pthread_mutex_unlock(_mutex); 5493 assert_status(status == 0, status, "mutex_unlock"); 5494 if (AnyWaiters != 0) { 5495 status = pthread_cond_signal(_cond); 5496 assert_status(status == 0, status, "cond_signal"); 5497 } 5498 } 5499 5500 // Note that we signal() _after dropping the lock for "immortal" Events. 5501 // This is safe and avoids a common class of futile wakeups. In rare 5502 // circumstances this can cause a thread to return prematurely from 5503 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 5504 // simply re-test the condition and re-park itself. 5505 } 5506 5507 5508 // JSR166 5509 // ------------------------------------------------------- 5510 5511 /* 5512 * The solaris and bsd implementations of park/unpark are fairly 5513 * conservative for now, but can be improved. They currently use a 5514 * mutex/condvar pair, plus a a count. 5515 * Park decrements count if > 0, else does a condvar wait. Unpark 5516 * sets count to 1 and signals condvar. Only one thread ever waits 5517 * on the condvar. Contention seen when trying to park implies that someone 5518 * is unparking you, so don't wait. And spurious returns are fine, so there 5519 * is no need to track notifications. 5520 */ 5521 5522 #define MAX_SECS 100000000 5523 /* 5524 * This code is common to bsd and solaris and will be moved to a 5525 * common place in dolphin. 5526 * 5527 * The passed in time value is either a relative time in nanoseconds 5528 * or an absolute time in milliseconds. Either way it has to be unpacked 5529 * into suitable seconds and nanoseconds components and stored in the 5530 * given timespec structure. 5531 * Given time is a 64-bit value and the time_t used in the timespec is only 5532 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 5533 * overflow if times way in the future are given. Further on Solaris versions 5534 * prior to 10 there is a restriction (see cond_timedwait) that the specified 5535 * number of seconds, in abstime, is less than current_time + 100,000,000. 5536 * As it will be 28 years before "now + 100000000" will overflow we can 5537 * ignore overflow and just impose a hard-limit on seconds using the value 5538 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 5539 * years from "now". 5540 */ 5541 5542 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 5543 assert (time > 0, "convertTime"); 5544 5545 struct timeval now; 5546 int status = gettimeofday(&now, NULL); 5547 assert(status == 0, "gettimeofday"); 5548 5549 time_t max_secs = now.tv_sec + MAX_SECS; 5550 5551 if (isAbsolute) { 5552 jlong secs = time / 1000; 5553 if (secs > max_secs) { 5554 absTime->tv_sec = max_secs; 5555 } 5556 else { 5557 absTime->tv_sec = secs; 5558 } 5559 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5560 } 5561 else { 5562 jlong secs = time / NANOSECS_PER_SEC; 5563 if (secs >= MAX_SECS) { 5564 absTime->tv_sec = max_secs; 5565 absTime->tv_nsec = 0; 5566 } 5567 else { 5568 absTime->tv_sec = now.tv_sec + secs; 5569 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5570 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5571 absTime->tv_nsec -= NANOSECS_PER_SEC; 5572 ++absTime->tv_sec; // note: this must be <= max_secs 5573 } 5574 } 5575 } 5576 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5577 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5578 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5579 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5580 } 5581 5582 void Parker::park(bool isAbsolute, jlong time) { 5583 // Optional fast-path check: 5584 // Return immediately if a permit is available. 5585 if (_counter > 0) { 5586 _counter = 0 ; 5587 OrderAccess::fence(); 5588 return ; 5589 } 5590 5591 Thread* thread = Thread::current(); 5592 assert(thread->is_Java_thread(), "Must be JavaThread"); 5593 JavaThread *jt = (JavaThread *)thread; 5594 5595 // Optional optimization -- avoid state transitions if there's an interrupt pending. 5596 // Check interrupt before trying to wait 5597 if (Thread::is_interrupted(thread, false)) { 5598 return; 5599 } 5600 5601 // Next, demultiplex/decode time arguments 5602 struct timespec absTime; 5603 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 5604 return; 5605 } 5606 if (time > 0) { 5607 unpackTime(&absTime, isAbsolute, time); 5608 } 5609 5610 5611 // Enter safepoint region 5612 // Beware of deadlocks such as 6317397. 5613 // The per-thread Parker:: mutex is a classic leaf-lock. 5614 // In particular a thread must never block on the Threads_lock while 5615 // holding the Parker:: mutex. If safepoints are pending both the 5616 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5617 ThreadBlockInVM tbivm(jt); 5618 5619 // Don't wait if cannot get lock since interference arises from 5620 // unblocking. Also. check interrupt before trying wait 5621 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 5622 return; 5623 } 5624 5625 int status ; 5626 if (_counter > 0) { // no wait needed 5627 _counter = 0; 5628 status = pthread_mutex_unlock(_mutex); 5629 assert (status == 0, "invariant") ; 5630 OrderAccess::fence(); 5631 return; 5632 } 5633 5634 #ifdef ASSERT 5635 // Don't catch signals while blocked; let the running threads have the signals. 5636 // (This allows a debugger to break into the running thread.) 5637 sigset_t oldsigs; 5638 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 5639 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5640 #endif 5641 5642 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5643 jt->set_suspend_equivalent(); 5644 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5645 5646 if (time == 0) { 5647 status = pthread_cond_wait (_cond, _mutex) ; 5648 } else { 5649 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 5650 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 5651 pthread_cond_destroy (_cond) ; 5652 pthread_cond_init (_cond, NULL); 5653 } 5654 } 5655 assert_status(status == 0 || status == EINTR || 5656 status == ETIMEDOUT, 5657 status, "cond_timedwait"); 5658 5659 #ifdef ASSERT 5660 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5661 #endif 5662 5663 _counter = 0 ; 5664 status = pthread_mutex_unlock(_mutex) ; 5665 assert_status(status == 0, status, "invariant") ; 5666 // If externally suspended while waiting, re-suspend 5667 if (jt->handle_special_suspend_equivalent_condition()) { 5668 jt->java_suspend_self(); 5669 } 5670 5671 OrderAccess::fence(); 5672 } 5673 5674 void Parker::unpark() { 5675 int s, status ; 5676 status = pthread_mutex_lock(_mutex); 5677 assert (status == 0, "invariant") ; 5678 s = _counter; 5679 _counter = 1; 5680 if (s < 1) { 5681 if (WorkAroundNPTLTimedWaitHang) { 5682 status = pthread_cond_signal (_cond) ; 5683 assert (status == 0, "invariant") ; 5684 status = pthread_mutex_unlock(_mutex); 5685 assert (status == 0, "invariant") ; 5686 } else { 5687 status = pthread_mutex_unlock(_mutex); 5688 assert (status == 0, "invariant") ; 5689 status = pthread_cond_signal (_cond) ; 5690 assert (status == 0, "invariant") ; 5691 } 5692 } else { 5693 pthread_mutex_unlock(_mutex); 5694 assert (status == 0, "invariant") ; 5695 } 5696 } 5697 5698 5699 /* Darwin has no "environ" in a dynamic library. */ 5700 #ifdef __APPLE__ 5701 #include <crt_externs.h> 5702 #define environ (*_NSGetEnviron()) 5703 #else 5704 extern char** environ; 5705 #endif 5706 5707 // Run the specified command in a separate process. Return its exit value, 5708 // or -1 on failure (e.g. can't fork a new process). 5709 // Unlike system(), this function can be called from signal handler. It 5710 // doesn't block SIGINT et al. 5711 int os::fork_and_exec(char* cmd) { 5712 const char * argv[4] = {"sh", "-c", cmd, NULL}; 5713 5714 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 5715 // pthread_atfork handlers and reset pthread library. All we need is a 5716 // separate process to execve. Make a direct syscall to fork process. 5717 // On IA64 there's no fork syscall, we have to use fork() and hope for 5718 // the best... 5719 pid_t pid = fork(); 5720 5721 if (pid < 0) { 5722 // fork failed 5723 return -1; 5724 5725 } else if (pid == 0) { 5726 // child process 5727 5728 // execve() in BsdThreads will call pthread_kill_other_threads_np() 5729 // first to kill every thread on the thread list. Because this list is 5730 // not reset by fork() (see notes above), execve() will instead kill 5731 // every thread in the parent process. We know this is the only thread 5732 // in the new process, so make a system call directly. 5733 // IA64 should use normal execve() from glibc to match the glibc fork() 5734 // above. 5735 execve("/bin/sh", (char* const*)argv, environ); 5736 5737 // execve failed 5738 _exit(-1); 5739 5740 } else { 5741 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5742 // care about the actual exit code, for now. 5743 5744 int status; 5745 5746 // Wait for the child process to exit. This returns immediately if 5747 // the child has already exited. */ 5748 while (waitpid(pid, &status, 0) < 0) { 5749 switch (errno) { 5750 case ECHILD: return 0; 5751 case EINTR: break; 5752 default: return -1; 5753 } 5754 } 5755 5756 if (WIFEXITED(status)) { 5757 // The child exited normally; get its exit code. 5758 return WEXITSTATUS(status); 5759 } else if (WIFSIGNALED(status)) { 5760 // The child exited because of a signal 5761 // The best value to return is 0x80 + signal number, 5762 // because that is what all Unix shells do, and because 5763 // it allows callers to distinguish between process exit and 5764 // process death by signal. 5765 return 0x80 + WTERMSIG(status); 5766 } else { 5767 // Unknown exit code; pass it through 5768 return status; 5769 } 5770 } 5771 } 5772 5773 // is_headless_jre() 5774 // 5775 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5776 // in order to report if we are running in a headless jre 5777 // 5778 // Since JDK8 xawt/libmawt.so was moved into the same directory 5779 // as libawt.so, and renamed libawt_xawt.so 5780 // 5781 bool os::is_headless_jre() { 5782 struct stat statbuf; 5783 char buf[MAXPATHLEN]; 5784 char libmawtpath[MAXPATHLEN]; 5785 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 5786 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 5787 char *p; 5788 5789 // Get path to libjvm.so 5790 os::jvm_path(buf, sizeof(buf)); 5791 5792 // Get rid of libjvm.so 5793 p = strrchr(buf, '/'); 5794 if (p == NULL) return false; 5795 else *p = '\0'; 5796 5797 // Get rid of client or server 5798 p = strrchr(buf, '/'); 5799 if (p == NULL) return false; 5800 else *p = '\0'; 5801 5802 // check xawt/libmawt.so 5803 strcpy(libmawtpath, buf); 5804 strcat(libmawtpath, xawtstr); 5805 if (::stat(libmawtpath, &statbuf) == 0) return false; 5806 5807 // check libawt_xawt.so 5808 strcpy(libmawtpath, buf); 5809 strcat(libmawtpath, new_xawtstr); 5810 if (::stat(libmawtpath, &statbuf) == 0) return false; 5811 5812 return true; 5813 }