os_bsd.cpp revision 5399:faff125a1ead
1/* 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// no precompiled headers 26#include "classfile/classLoader.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "classfile/vmSymbols.hpp" 29#include "code/icBuffer.hpp" 30#include "code/vtableStubs.hpp" 31#include "compiler/compileBroker.hpp" 32#include "compiler/disassembler.hpp" 33#include "interpreter/interpreter.hpp" 34#include "jvm_bsd.h" 35#include "memory/allocation.inline.hpp" 36#include "memory/filemap.hpp" 37#include "mutex_bsd.inline.hpp" 38#include "oops/oop.inline.hpp" 39#include "os_share_bsd.hpp" 40#include "prims/jniFastGetField.hpp" 41#include "prims/jvm.h" 42#include "prims/jvm_misc.hpp" 43#include "runtime/arguments.hpp" 44#include "runtime/extendedPC.hpp" 45#include "runtime/globals.hpp" 46#include "runtime/interfaceSupport.hpp" 47#include "runtime/java.hpp" 48#include "runtime/javaCalls.hpp" 49#include "runtime/mutexLocker.hpp" 50#include "runtime/objectMonitor.hpp" 51#include "runtime/osThread.hpp" 52#include "runtime/perfMemory.hpp" 53#include "runtime/sharedRuntime.hpp" 54#include "runtime/statSampler.hpp" 55#include "runtime/stubRoutines.hpp" 56#include "runtime/thread.inline.hpp" 57#include "runtime/threadCritical.hpp" 58#include "runtime/timer.hpp" 59#include "services/attachListener.hpp" 60#include "services/memTracker.hpp" 61#include "services/runtimeService.hpp" 62#include "utilities/decoder.hpp" 63#include "utilities/defaultStream.hpp" 64#include "utilities/events.hpp" 65#include "utilities/growableArray.hpp" 66#include "utilities/vmError.hpp" 67 68// put OS-includes here 69# include <sys/types.h> 70# include <sys/mman.h> 71# include <sys/stat.h> 72# include <sys/select.h> 73# include <pthread.h> 74# include <signal.h> 75# include <errno.h> 76# include <dlfcn.h> 77# include <stdio.h> 78# include <unistd.h> 79# include <sys/resource.h> 80# include <pthread.h> 81# include <sys/stat.h> 82# include <sys/time.h> 83# include <sys/times.h> 84# include <sys/utsname.h> 85# include <sys/socket.h> 86# include <sys/wait.h> 87# include <time.h> 88# include <pwd.h> 89# include <poll.h> 90# include <semaphore.h> 91# include <fcntl.h> 92# include <string.h> 93# include <sys/param.h> 94# include <sys/sysctl.h> 95# include <sys/ipc.h> 96# include <sys/shm.h> 97#ifndef __APPLE__ 98# include <link.h> 99#endif 100# include <stdint.h> 101# include <inttypes.h> 102# include <sys/ioctl.h> 103# include <sys/syscall.h> 104 105#if defined(__FreeBSD__) || defined(__NetBSD__) 106# include <elf.h> 107#endif 108 109#ifdef __APPLE__ 110# include <mach/mach.h> // semaphore_* API 111# include <mach-o/dyld.h> 112# include <sys/proc_info.h> 113# include <objc/objc-auto.h> 114#endif 115 116#ifndef MAP_ANONYMOUS 117#define MAP_ANONYMOUS MAP_ANON 118#endif 119 120#define MAX_PATH (2 * K) 121 122// for timer info max values which include all bits 123#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 124 125#define LARGEPAGES_BIT (1 << 6) 126//////////////////////////////////////////////////////////////////////////////// 127// global variables 128julong os::Bsd::_physical_memory = 0; 129 130 131int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 132pthread_t os::Bsd::_main_thread; 133int os::Bsd::_page_size = -1; 134 135static jlong initial_time_count=0; 136 137static int clock_tics_per_sec = 100; 138 139// For diagnostics to print a message once. see run_periodic_checks 140static sigset_t check_signal_done; 141static bool check_signals = true; 142 143static pid_t _initial_pid = 0; 144 145/* Signal number used to suspend/resume a thread */ 146 147/* do not use any signal number less than SIGSEGV, see 4355769 */ 148static int SR_signum = SIGUSR2; 149sigset_t SR_sigset; 150 151 152//////////////////////////////////////////////////////////////////////////////// 153// utility functions 154 155static int SR_initialize(); 156static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 157 158julong os::available_memory() { 159 return Bsd::available_memory(); 160} 161 162julong os::Bsd::available_memory() { 163 // XXXBSD: this is just a stopgap implementation 164 return physical_memory() >> 2; 165} 166 167julong os::physical_memory() { 168 return Bsd::physical_memory(); 169} 170 171//////////////////////////////////////////////////////////////////////////////// 172// environment support 173 174bool os::getenv(const char* name, char* buf, int len) { 175 const char* val = ::getenv(name); 176 if (val != NULL && strlen(val) < (size_t)len) { 177 strcpy(buf, val); 178 return true; 179 } 180 if (len > 0) buf[0] = 0; // return a null string 181 return false; 182} 183 184 185// Return true if user is running as root. 186 187bool os::have_special_privileges() { 188 static bool init = false; 189 static bool privileges = false; 190 if (!init) { 191 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 192 init = true; 193 } 194 return privileges; 195} 196 197 198 199// Cpu architecture string 200#if defined(ZERO) 201static char cpu_arch[] = ZERO_LIBARCH; 202#elif defined(IA64) 203static char cpu_arch[] = "ia64"; 204#elif defined(IA32) 205static char cpu_arch[] = "i386"; 206#elif defined(AMD64) 207static char cpu_arch[] = "amd64"; 208#elif defined(ARM) 209static char cpu_arch[] = "arm"; 210#elif defined(PPC) 211static char cpu_arch[] = "ppc"; 212#elif defined(SPARC) 213# ifdef _LP64 214static char cpu_arch[] = "sparcv9"; 215# else 216static char cpu_arch[] = "sparc"; 217# endif 218#else 219#error Add appropriate cpu_arch setting 220#endif 221 222// Compiler variant 223#ifdef COMPILER2 224#define COMPILER_VARIANT "server" 225#else 226#define COMPILER_VARIANT "client" 227#endif 228 229 230void os::Bsd::initialize_system_info() { 231 int mib[2]; 232 size_t len; 233 int cpu_val; 234 julong mem_val; 235 236 /* get processors count via hw.ncpus sysctl */ 237 mib[0] = CTL_HW; 238 mib[1] = HW_NCPU; 239 len = sizeof(cpu_val); 240 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 241 assert(len == sizeof(cpu_val), "unexpected data size"); 242 set_processor_count(cpu_val); 243 } 244 else { 245 set_processor_count(1); // fallback 246 } 247 248 /* get physical memory via hw.memsize sysctl (hw.memsize is used 249 * since it returns a 64 bit value) 250 */ 251 mib[0] = CTL_HW; 252 253#if defined (HW_MEMSIZE) // Apple 254 mib[1] = HW_MEMSIZE; 255#elif defined(HW_PHYSMEM) // Most of BSD 256 mib[1] = HW_PHYSMEM; 257#elif defined(HW_REALMEM) // Old FreeBSD 258 mib[1] = HW_REALMEM; 259#else 260 #error No ways to get physmem 261#endif 262 263 len = sizeof(mem_val); 264 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 265 assert(len == sizeof(mem_val), "unexpected data size"); 266 _physical_memory = mem_val; 267 } else { 268 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 269 } 270 271#ifdef __OpenBSD__ 272 { 273 // limit _physical_memory memory view on OpenBSD since 274 // datasize rlimit restricts us anyway. 275 struct rlimit limits; 276 getrlimit(RLIMIT_DATA, &limits); 277 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 278 } 279#endif 280} 281 282#ifdef __APPLE__ 283static const char *get_home() { 284 const char *home_dir = ::getenv("HOME"); 285 if ((home_dir == NULL) || (*home_dir == '\0')) { 286 struct passwd *passwd_info = getpwuid(geteuid()); 287 if (passwd_info != NULL) { 288 home_dir = passwd_info->pw_dir; 289 } 290 } 291 292 return home_dir; 293} 294#endif 295 296void os::init_system_properties_values() { 297// char arch[12]; 298// sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 299 300 // The next steps are taken in the product version: 301 // 302 // Obtain the JAVA_HOME value from the location of libjvm.so. 303 // This library should be located at: 304 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 305 // 306 // If "/jre/lib/" appears at the right place in the path, then we 307 // assume libjvm.so is installed in a JDK and we use this path. 308 // 309 // Otherwise exit with message: "Could not create the Java virtual machine." 310 // 311 // The following extra steps are taken in the debugging version: 312 // 313 // If "/jre/lib/" does NOT appear at the right place in the path 314 // instead of exit check for $JAVA_HOME environment variable. 315 // 316 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 317 // then we append a fake suffix "hotspot/libjvm.so" to this path so 318 // it looks like libjvm.so is installed there 319 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 320 // 321 // Otherwise exit. 322 // 323 // Important note: if the location of libjvm.so changes this 324 // code needs to be changed accordingly. 325 326 // The next few definitions allow the code to be verbatim: 327#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 328#define getenv(n) ::getenv(n) 329 330/* 331 * See ld(1): 332 * The linker uses the following search paths to locate required 333 * shared libraries: 334 * 1: ... 335 * ... 336 * 7: The default directories, normally /lib and /usr/lib. 337 */ 338#ifndef DEFAULT_LIBPATH 339#define DEFAULT_LIBPATH "/lib:/usr/lib" 340#endif 341 342#define EXTENSIONS_DIR "/lib/ext" 343#define ENDORSED_DIR "/lib/endorsed" 344#define REG_DIR "/usr/java/packages" 345 346#ifdef __APPLE__ 347#define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 348#define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 349 const char *user_home_dir = get_home(); 350 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 351 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 352 sizeof(SYS_EXTENSIONS_DIRS); 353#endif 354 355 { 356 /* sysclasspath, java_home, dll_dir */ 357 { 358 char *home_path; 359 char *dll_path; 360 char *pslash; 361 char buf[MAXPATHLEN]; 362 os::jvm_path(buf, sizeof(buf)); 363 364 // Found the full path to libjvm.so. 365 // Now cut the path to <java_home>/jre if we can. 366 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 367 pslash = strrchr(buf, '/'); 368 if (pslash != NULL) 369 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 370 dll_path = malloc(strlen(buf) + 1); 371 if (dll_path == NULL) 372 return; 373 strcpy(dll_path, buf); 374 Arguments::set_dll_dir(dll_path); 375 376 if (pslash != NULL) { 377 pslash = strrchr(buf, '/'); 378 if (pslash != NULL) { 379 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 380#ifndef __APPLE__ 381 pslash = strrchr(buf, '/'); 382 if (pslash != NULL) 383 *pslash = '\0'; /* get rid of /lib */ 384#endif 385 } 386 } 387 388 home_path = malloc(strlen(buf) + 1); 389 if (home_path == NULL) 390 return; 391 strcpy(home_path, buf); 392 Arguments::set_java_home(home_path); 393 394 if (!set_boot_path('/', ':')) 395 return; 396 } 397 398 /* 399 * Where to look for native libraries 400 * 401 * Note: Due to a legacy implementation, most of the library path 402 * is set in the launcher. This was to accomodate linking restrictions 403 * on legacy Bsd implementations (which are no longer supported). 404 * Eventually, all the library path setting will be done here. 405 * 406 * However, to prevent the proliferation of improperly built native 407 * libraries, the new path component /usr/java/packages is added here. 408 * Eventually, all the library path setting will be done here. 409 */ 410 { 411 char *ld_library_path; 412 413 /* 414 * Construct the invariant part of ld_library_path. Note that the 415 * space for the colon and the trailing null are provided by the 416 * nulls included by the sizeof operator (so actually we allocate 417 * a byte more than necessary). 418 */ 419#ifdef __APPLE__ 420 ld_library_path = (char *) malloc(system_ext_size); 421 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 422#else 423 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 424 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 425 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 426#endif 427 428 /* 429 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 430 * should always exist (until the legacy problem cited above is 431 * addressed). 432 */ 433#ifdef __APPLE__ 434 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 435 char *l = getenv("JAVA_LIBRARY_PATH"); 436 if (l != NULL) { 437 char *t = ld_library_path; 438 /* That's +1 for the colon and +1 for the trailing '\0' */ 439 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 440 sprintf(ld_library_path, "%s:%s", l, t); 441 free(t); 442 } 443 444 char *v = getenv("DYLD_LIBRARY_PATH"); 445#else 446 char *v = getenv("LD_LIBRARY_PATH"); 447#endif 448 if (v != NULL) { 449 char *t = ld_library_path; 450 /* That's +1 for the colon and +1 for the trailing '\0' */ 451 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 452 sprintf(ld_library_path, "%s:%s", v, t); 453 free(t); 454 } 455 456#ifdef __APPLE__ 457 // Apple's Java6 has "." at the beginning of java.library.path. 458 // OpenJDK on Windows has "." at the end of java.library.path. 459 // OpenJDK on Linux and Solaris don't have "." in java.library.path 460 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 461 // "." is appended to the end of java.library.path. Yes, this 462 // could cause a change in behavior, but Apple's Java6 behavior 463 // can be achieved by putting "." at the beginning of the 464 // JAVA_LIBRARY_PATH environment variable. 465 { 466 char *t = ld_library_path; 467 // that's +3 for appending ":." and the trailing '\0' 468 ld_library_path = (char *) malloc(strlen(t) + 3); 469 sprintf(ld_library_path, "%s:%s", t, "."); 470 free(t); 471 } 472#endif 473 474 Arguments::set_library_path(ld_library_path); 475 } 476 477 /* 478 * Extensions directories. 479 * 480 * Note that the space for the colon and the trailing null are provided 481 * by the nulls included by the sizeof operator (so actually one byte more 482 * than necessary is allocated). 483 */ 484 { 485#ifdef __APPLE__ 486 char *buf = malloc(strlen(Arguments::get_java_home()) + 487 sizeof(EXTENSIONS_DIR) + system_ext_size); 488 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 489 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 490#else 491 char *buf = malloc(strlen(Arguments::get_java_home()) + 492 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 493 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 494 Arguments::get_java_home()); 495#endif 496 497 Arguments::set_ext_dirs(buf); 498 } 499 500 /* Endorsed standards default directory. */ 501 { 502 char * buf; 503 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 504 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 505 Arguments::set_endorsed_dirs(buf); 506 } 507 } 508 509#ifdef __APPLE__ 510#undef SYS_EXTENSIONS_DIR 511#endif 512#undef malloc 513#undef getenv 514#undef EXTENSIONS_DIR 515#undef ENDORSED_DIR 516 517 // Done 518 return; 519} 520 521//////////////////////////////////////////////////////////////////////////////// 522// breakpoint support 523 524void os::breakpoint() { 525 BREAKPOINT; 526} 527 528extern "C" void breakpoint() { 529 // use debugger to set breakpoint here 530} 531 532//////////////////////////////////////////////////////////////////////////////// 533// signal support 534 535debug_only(static bool signal_sets_initialized = false); 536static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 537 538bool os::Bsd::is_sig_ignored(int sig) { 539 struct sigaction oact; 540 sigaction(sig, (struct sigaction*)NULL, &oact); 541 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 542 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 543 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 544 return true; 545 else 546 return false; 547} 548 549void os::Bsd::signal_sets_init() { 550 // Should also have an assertion stating we are still single-threaded. 551 assert(!signal_sets_initialized, "Already initialized"); 552 // Fill in signals that are necessarily unblocked for all threads in 553 // the VM. Currently, we unblock the following signals: 554 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 555 // by -Xrs (=ReduceSignalUsage)); 556 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 557 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 558 // the dispositions or masks wrt these signals. 559 // Programs embedding the VM that want to use the above signals for their 560 // own purposes must, at this time, use the "-Xrs" option to prevent 561 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 562 // (See bug 4345157, and other related bugs). 563 // In reality, though, unblocking these signals is really a nop, since 564 // these signals are not blocked by default. 565 sigemptyset(&unblocked_sigs); 566 sigemptyset(&allowdebug_blocked_sigs); 567 sigaddset(&unblocked_sigs, SIGILL); 568 sigaddset(&unblocked_sigs, SIGSEGV); 569 sigaddset(&unblocked_sigs, SIGBUS); 570 sigaddset(&unblocked_sigs, SIGFPE); 571 sigaddset(&unblocked_sigs, SR_signum); 572 573 if (!ReduceSignalUsage) { 574 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 575 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 576 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 577 } 578 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 579 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 580 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 581 } 582 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 583 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 584 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 585 } 586 } 587 // Fill in signals that are blocked by all but the VM thread. 588 sigemptyset(&vm_sigs); 589 if (!ReduceSignalUsage) 590 sigaddset(&vm_sigs, BREAK_SIGNAL); 591 debug_only(signal_sets_initialized = true); 592 593} 594 595// These are signals that are unblocked while a thread is running Java. 596// (For some reason, they get blocked by default.) 597sigset_t* os::Bsd::unblocked_signals() { 598 assert(signal_sets_initialized, "Not initialized"); 599 return &unblocked_sigs; 600} 601 602// These are the signals that are blocked while a (non-VM) thread is 603// running Java. Only the VM thread handles these signals. 604sigset_t* os::Bsd::vm_signals() { 605 assert(signal_sets_initialized, "Not initialized"); 606 return &vm_sigs; 607} 608 609// These are signals that are blocked during cond_wait to allow debugger in 610sigset_t* os::Bsd::allowdebug_blocked_signals() { 611 assert(signal_sets_initialized, "Not initialized"); 612 return &allowdebug_blocked_sigs; 613} 614 615void os::Bsd::hotspot_sigmask(Thread* thread) { 616 617 //Save caller's signal mask before setting VM signal mask 618 sigset_t caller_sigmask; 619 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 620 621 OSThread* osthread = thread->osthread(); 622 osthread->set_caller_sigmask(caller_sigmask); 623 624 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 625 626 if (!ReduceSignalUsage) { 627 if (thread->is_VM_thread()) { 628 // Only the VM thread handles BREAK_SIGNAL ... 629 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 630 } else { 631 // ... all other threads block BREAK_SIGNAL 632 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 633 } 634 } 635} 636 637 638////////////////////////////////////////////////////////////////////////////// 639// create new thread 640 641// check if it's safe to start a new thread 642static bool _thread_safety_check(Thread* thread) { 643 return true; 644} 645 646#ifdef __APPLE__ 647// library handle for calling objc_registerThreadWithCollector() 648// without static linking to the libobjc library 649#define OBJC_LIB "/usr/lib/libobjc.dylib" 650#define OBJC_GCREGISTER "objc_registerThreadWithCollector" 651typedef void (*objc_registerThreadWithCollector_t)(); 652extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 653objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 654#endif 655 656#ifdef __APPLE__ 657static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 658 // Additional thread_id used to correlate threads in SA 659 thread_identifier_info_data_t m_ident_info; 660 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 661 662 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 663 (thread_info_t) &m_ident_info, &count); 664 665 return m_ident_info.thread_id; 666} 667#endif 668 669// Thread start routine for all newly created threads 670static void *java_start(Thread *thread) { 671 // Try to randomize the cache line index of hot stack frames. 672 // This helps when threads of the same stack traces evict each other's 673 // cache lines. The threads can be either from the same JVM instance, or 674 // from different JVM instances. The benefit is especially true for 675 // processors with hyperthreading technology. 676 static int counter = 0; 677 int pid = os::current_process_id(); 678 alloca(((pid ^ counter++) & 7) * 128); 679 680 ThreadLocalStorage::set_thread(thread); 681 682 OSThread* osthread = thread->osthread(); 683 Monitor* sync = osthread->startThread_lock(); 684 685 // non floating stack BsdThreads needs extra check, see above 686 if (!_thread_safety_check(thread)) { 687 // notify parent thread 688 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 689 osthread->set_state(ZOMBIE); 690 sync->notify_all(); 691 return NULL; 692 } 693 694 osthread->set_thread_id(os::Bsd::gettid()); 695 696#ifdef __APPLE__ 697 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 698 guarantee(unique_thread_id != 0, "unique thread id was not found"); 699 osthread->set_unique_thread_id(unique_thread_id); 700#endif 701 // initialize signal mask for this thread 702 os::Bsd::hotspot_sigmask(thread); 703 704 // initialize floating point control register 705 os::Bsd::init_thread_fpu_state(); 706 707#ifdef __APPLE__ 708 // register thread with objc gc 709 if (objc_registerThreadWithCollectorFunction != NULL) { 710 objc_registerThreadWithCollectorFunction(); 711 } 712#endif 713 714 // handshaking with parent thread 715 { 716 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 717 718 // notify parent thread 719 osthread->set_state(INITIALIZED); 720 sync->notify_all(); 721 722 // wait until os::start_thread() 723 while (osthread->get_state() == INITIALIZED) { 724 sync->wait(Mutex::_no_safepoint_check_flag); 725 } 726 } 727 728 // call one more level start routine 729 thread->run(); 730 731 return 0; 732} 733 734bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 735 assert(thread->osthread() == NULL, "caller responsible"); 736 737 // Allocate the OSThread object 738 OSThread* osthread = new OSThread(NULL, NULL); 739 if (osthread == NULL) { 740 return false; 741 } 742 743 // set the correct thread state 744 osthread->set_thread_type(thr_type); 745 746 // Initial state is ALLOCATED but not INITIALIZED 747 osthread->set_state(ALLOCATED); 748 749 thread->set_osthread(osthread); 750 751 // init thread attributes 752 pthread_attr_t attr; 753 pthread_attr_init(&attr); 754 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 755 756 // stack size 757 if (os::Bsd::supports_variable_stack_size()) { 758 // calculate stack size if it's not specified by caller 759 if (stack_size == 0) { 760 stack_size = os::Bsd::default_stack_size(thr_type); 761 762 switch (thr_type) { 763 case os::java_thread: 764 // Java threads use ThreadStackSize which default value can be 765 // changed with the flag -Xss 766 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 767 stack_size = JavaThread::stack_size_at_create(); 768 break; 769 case os::compiler_thread: 770 if (CompilerThreadStackSize > 0) { 771 stack_size = (size_t)(CompilerThreadStackSize * K); 772 break; 773 } // else fall through: 774 // use VMThreadStackSize if CompilerThreadStackSize is not defined 775 case os::vm_thread: 776 case os::pgc_thread: 777 case os::cgc_thread: 778 case os::watcher_thread: 779 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 780 break; 781 } 782 } 783 784 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 785 pthread_attr_setstacksize(&attr, stack_size); 786 } else { 787 // let pthread_create() pick the default value. 788 } 789 790 ThreadState state; 791 792 { 793 pthread_t tid; 794 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 795 796 pthread_attr_destroy(&attr); 797 798 if (ret != 0) { 799 if (PrintMiscellaneous && (Verbose || WizardMode)) { 800 perror("pthread_create()"); 801 } 802 // Need to clean up stuff we've allocated so far 803 thread->set_osthread(NULL); 804 delete osthread; 805 return false; 806 } 807 808 // Store pthread info into the OSThread 809 osthread->set_pthread_id(tid); 810 811 // Wait until child thread is either initialized or aborted 812 { 813 Monitor* sync_with_child = osthread->startThread_lock(); 814 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 815 while ((state = osthread->get_state()) == ALLOCATED) { 816 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 817 } 818 } 819 820 } 821 822 // Aborted due to thread limit being reached 823 if (state == ZOMBIE) { 824 thread->set_osthread(NULL); 825 delete osthread; 826 return false; 827 } 828 829 // The thread is returned suspended (in state INITIALIZED), 830 // and is started higher up in the call chain 831 assert(state == INITIALIZED, "race condition"); 832 return true; 833} 834 835///////////////////////////////////////////////////////////////////////////// 836// attach existing thread 837 838// bootstrap the main thread 839bool os::create_main_thread(JavaThread* thread) { 840 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 841 return create_attached_thread(thread); 842} 843 844bool os::create_attached_thread(JavaThread* thread) { 845#ifdef ASSERT 846 thread->verify_not_published(); 847#endif 848 849 // Allocate the OSThread object 850 OSThread* osthread = new OSThread(NULL, NULL); 851 852 if (osthread == NULL) { 853 return false; 854 } 855 856 osthread->set_thread_id(os::Bsd::gettid()); 857 858 // Store pthread info into the OSThread 859#ifdef __APPLE__ 860 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 861 guarantee(unique_thread_id != 0, "just checking"); 862 osthread->set_unique_thread_id(unique_thread_id); 863#endif 864 osthread->set_pthread_id(::pthread_self()); 865 866 // initialize floating point control register 867 os::Bsd::init_thread_fpu_state(); 868 869 // Initial thread state is RUNNABLE 870 osthread->set_state(RUNNABLE); 871 872 thread->set_osthread(osthread); 873 874 // initialize signal mask for this thread 875 // and save the caller's signal mask 876 os::Bsd::hotspot_sigmask(thread); 877 878 return true; 879} 880 881void os::pd_start_thread(Thread* thread) { 882 OSThread * osthread = thread->osthread(); 883 assert(osthread->get_state() != INITIALIZED, "just checking"); 884 Monitor* sync_with_child = osthread->startThread_lock(); 885 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 886 sync_with_child->notify(); 887} 888 889// Free Bsd resources related to the OSThread 890void os::free_thread(OSThread* osthread) { 891 assert(osthread != NULL, "osthread not set"); 892 893 if (Thread::current()->osthread() == osthread) { 894 // Restore caller's signal mask 895 sigset_t sigmask = osthread->caller_sigmask(); 896 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 897 } 898 899 delete osthread; 900} 901 902////////////////////////////////////////////////////////////////////////////// 903// thread local storage 904 905int os::allocate_thread_local_storage() { 906 pthread_key_t key; 907 int rslt = pthread_key_create(&key, NULL); 908 assert(rslt == 0, "cannot allocate thread local storage"); 909 return (int)key; 910} 911 912// Note: This is currently not used by VM, as we don't destroy TLS key 913// on VM exit. 914void os::free_thread_local_storage(int index) { 915 int rslt = pthread_key_delete((pthread_key_t)index); 916 assert(rslt == 0, "invalid index"); 917} 918 919void os::thread_local_storage_at_put(int index, void* value) { 920 int rslt = pthread_setspecific((pthread_key_t)index, value); 921 assert(rslt == 0, "pthread_setspecific failed"); 922} 923 924extern "C" Thread* get_thread() { 925 return ThreadLocalStorage::thread(); 926} 927 928 929//////////////////////////////////////////////////////////////////////////////// 930// time support 931 932// Time since start-up in seconds to a fine granularity. 933// Used by VMSelfDestructTimer and the MemProfiler. 934double os::elapsedTime() { 935 936 return (double)(os::elapsed_counter()) * 0.000001; 937} 938 939jlong os::elapsed_counter() { 940 timeval time; 941 int status = gettimeofday(&time, NULL); 942 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 943} 944 945jlong os::elapsed_frequency() { 946 return (1000 * 1000); 947} 948 949bool os::supports_vtime() { return true; } 950bool os::enable_vtime() { return false; } 951bool os::vtime_enabled() { return false; } 952 953double os::elapsedVTime() { 954 // better than nothing, but not much 955 return elapsedTime(); 956} 957 958jlong os::javaTimeMillis() { 959 timeval time; 960 int status = gettimeofday(&time, NULL); 961 assert(status != -1, "bsd error"); 962 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 963} 964 965#ifndef CLOCK_MONOTONIC 966#define CLOCK_MONOTONIC (1) 967#endif 968 969#ifdef __APPLE__ 970void os::Bsd::clock_init() { 971 // XXXDARWIN: Investigate replacement monotonic clock 972} 973#else 974void os::Bsd::clock_init() { 975 struct timespec res; 976 struct timespec tp; 977 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 978 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 979 // yes, monotonic clock is supported 980 _clock_gettime = ::clock_gettime; 981 } 982} 983#endif 984 985 986jlong os::javaTimeNanos() { 987 if (Bsd::supports_monotonic_clock()) { 988 struct timespec tp; 989 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 990 assert(status == 0, "gettime error"); 991 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 992 return result; 993 } else { 994 timeval time; 995 int status = gettimeofday(&time, NULL); 996 assert(status != -1, "bsd error"); 997 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 998 return 1000 * usecs; 999 } 1000} 1001 1002void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1003 if (Bsd::supports_monotonic_clock()) { 1004 info_ptr->max_value = ALL_64_BITS; 1005 1006 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1007 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1008 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1009 } else { 1010 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1011 info_ptr->max_value = ALL_64_BITS; 1012 1013 // gettimeofday is a real time clock so it skips 1014 info_ptr->may_skip_backward = true; 1015 info_ptr->may_skip_forward = true; 1016 } 1017 1018 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1019} 1020 1021// Return the real, user, and system times in seconds from an 1022// arbitrary fixed point in the past. 1023bool os::getTimesSecs(double* process_real_time, 1024 double* process_user_time, 1025 double* process_system_time) { 1026 struct tms ticks; 1027 clock_t real_ticks = times(&ticks); 1028 1029 if (real_ticks == (clock_t) (-1)) { 1030 return false; 1031 } else { 1032 double ticks_per_second = (double) clock_tics_per_sec; 1033 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1034 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1035 *process_real_time = ((double) real_ticks) / ticks_per_second; 1036 1037 return true; 1038 } 1039} 1040 1041 1042char * os::local_time_string(char *buf, size_t buflen) { 1043 struct tm t; 1044 time_t long_time; 1045 time(&long_time); 1046 localtime_r(&long_time, &t); 1047 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1048 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1049 t.tm_hour, t.tm_min, t.tm_sec); 1050 return buf; 1051} 1052 1053struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1054 return localtime_r(clock, res); 1055} 1056 1057//////////////////////////////////////////////////////////////////////////////// 1058// runtime exit support 1059 1060// Note: os::shutdown() might be called very early during initialization, or 1061// called from signal handler. Before adding something to os::shutdown(), make 1062// sure it is async-safe and can handle partially initialized VM. 1063void os::shutdown() { 1064 1065 // allow PerfMemory to attempt cleanup of any persistent resources 1066 perfMemory_exit(); 1067 1068 // needs to remove object in file system 1069 AttachListener::abort(); 1070 1071 // flush buffered output, finish log files 1072 ostream_abort(); 1073 1074 // Check for abort hook 1075 abort_hook_t abort_hook = Arguments::abort_hook(); 1076 if (abort_hook != NULL) { 1077 abort_hook(); 1078 } 1079 1080} 1081 1082// Note: os::abort() might be called very early during initialization, or 1083// called from signal handler. Before adding something to os::abort(), make 1084// sure it is async-safe and can handle partially initialized VM. 1085void os::abort(bool dump_core) { 1086 os::shutdown(); 1087 if (dump_core) { 1088#ifndef PRODUCT 1089 fdStream out(defaultStream::output_fd()); 1090 out.print_raw("Current thread is "); 1091 char buf[16]; 1092 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1093 out.print_raw_cr(buf); 1094 out.print_raw_cr("Dumping core ..."); 1095#endif 1096 ::abort(); // dump core 1097 } 1098 1099 ::exit(1); 1100} 1101 1102// Die immediately, no exit hook, no abort hook, no cleanup. 1103void os::die() { 1104 // _exit() on BsdThreads only kills current thread 1105 ::abort(); 1106} 1107 1108// unused on bsd for now. 1109void os::set_error_file(const char *logfile) {} 1110 1111 1112// This method is a copy of JDK's sysGetLastErrorString 1113// from src/solaris/hpi/src/system_md.c 1114 1115size_t os::lasterror(char *buf, size_t len) { 1116 1117 if (errno == 0) return 0; 1118 1119 const char *s = ::strerror(errno); 1120 size_t n = ::strlen(s); 1121 if (n >= len) { 1122 n = len - 1; 1123 } 1124 ::strncpy(buf, s, n); 1125 buf[n] = '\0'; 1126 return n; 1127} 1128 1129// Information of current thread in variety of formats 1130pid_t os::Bsd::gettid() { 1131 int retval = -1; 1132 1133#ifdef __APPLE__ //XNU kernel 1134 // despite the fact mach port is actually not a thread id use it 1135 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1136 retval = ::pthread_mach_thread_np(::pthread_self()); 1137 guarantee(retval != 0, "just checking"); 1138 return retval; 1139 1140#elif __FreeBSD__ 1141 retval = syscall(SYS_thr_self); 1142#elif __OpenBSD__ 1143 retval = syscall(SYS_getthrid); 1144#elif __NetBSD__ 1145 retval = (pid_t) syscall(SYS__lwp_self); 1146#endif 1147 1148 if (retval == -1) { 1149 return getpid(); 1150 } 1151} 1152 1153intx os::current_thread_id() { 1154#ifdef __APPLE__ 1155 return (intx)::pthread_mach_thread_np(::pthread_self()); 1156#else 1157 return (intx)::pthread_self(); 1158#endif 1159} 1160 1161int os::current_process_id() { 1162 1163 // Under the old bsd thread library, bsd gives each thread 1164 // its own process id. Because of this each thread will return 1165 // a different pid if this method were to return the result 1166 // of getpid(2). Bsd provides no api that returns the pid 1167 // of the launcher thread for the vm. This implementation 1168 // returns a unique pid, the pid of the launcher thread 1169 // that starts the vm 'process'. 1170 1171 // Under the NPTL, getpid() returns the same pid as the 1172 // launcher thread rather than a unique pid per thread. 1173 // Use gettid() if you want the old pre NPTL behaviour. 1174 1175 // if you are looking for the result of a call to getpid() that 1176 // returns a unique pid for the calling thread, then look at the 1177 // OSThread::thread_id() method in osThread_bsd.hpp file 1178 1179 return (int)(_initial_pid ? _initial_pid : getpid()); 1180} 1181 1182// DLL functions 1183 1184#define JNI_LIB_PREFIX "lib" 1185#ifdef __APPLE__ 1186#define JNI_LIB_SUFFIX ".dylib" 1187#else 1188#define JNI_LIB_SUFFIX ".so" 1189#endif 1190 1191const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1192 1193// This must be hard coded because it's the system's temporary 1194// directory not the java application's temp directory, ala java.io.tmpdir. 1195#ifdef __APPLE__ 1196// macosx has a secure per-user temporary directory 1197char temp_path_storage[PATH_MAX]; 1198const char* os::get_temp_directory() { 1199 static char *temp_path = NULL; 1200 if (temp_path == NULL) { 1201 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1202 if (pathSize == 0 || pathSize > PATH_MAX) { 1203 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1204 } 1205 temp_path = temp_path_storage; 1206 } 1207 return temp_path; 1208} 1209#else /* __APPLE__ */ 1210const char* os::get_temp_directory() { return "/tmp"; } 1211#endif /* __APPLE__ */ 1212 1213static bool file_exists(const char* filename) { 1214 struct stat statbuf; 1215 if (filename == NULL || strlen(filename) == 0) { 1216 return false; 1217 } 1218 return os::stat(filename, &statbuf) == 0; 1219} 1220 1221bool os::dll_build_name(char* buffer, size_t buflen, 1222 const char* pname, const char* fname) { 1223 bool retval = false; 1224 // Copied from libhpi 1225 const size_t pnamelen = pname ? strlen(pname) : 0; 1226 1227 // Return error on buffer overflow. 1228 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1229 return retval; 1230 } 1231 1232 if (pnamelen == 0) { 1233 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1234 retval = true; 1235 } else if (strchr(pname, *os::path_separator()) != NULL) { 1236 int n; 1237 char** pelements = split_path(pname, &n); 1238 if (pelements == NULL) { 1239 return false; 1240 } 1241 for (int i = 0 ; i < n ; i++) { 1242 // Really shouldn't be NULL, but check can't hurt 1243 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1244 continue; // skip the empty path values 1245 } 1246 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1247 pelements[i], fname); 1248 if (file_exists(buffer)) { 1249 retval = true; 1250 break; 1251 } 1252 } 1253 // release the storage 1254 for (int i = 0 ; i < n ; i++) { 1255 if (pelements[i] != NULL) { 1256 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1257 } 1258 } 1259 if (pelements != NULL) { 1260 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1261 } 1262 } else { 1263 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1264 retval = true; 1265 } 1266 return retval; 1267} 1268 1269// check if addr is inside libjvm.so 1270bool os::address_is_in_vm(address addr) { 1271 static address libjvm_base_addr; 1272 Dl_info dlinfo; 1273 1274 if (libjvm_base_addr == NULL) { 1275 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1276 libjvm_base_addr = (address)dlinfo.dli_fbase; 1277 } 1278 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1279 } 1280 1281 if (dladdr((void *)addr, &dlinfo) != 0) { 1282 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1283 } 1284 1285 return false; 1286} 1287 1288 1289#define MACH_MAXSYMLEN 256 1290 1291bool os::dll_address_to_function_name(address addr, char *buf, 1292 int buflen, int *offset) { 1293 // buf is not optional, but offset is optional 1294 assert(buf != NULL, "sanity check"); 1295 1296 Dl_info dlinfo; 1297 char localbuf[MACH_MAXSYMLEN]; 1298 1299 if (dladdr((void*)addr, &dlinfo) != 0) { 1300 // see if we have a matching symbol 1301 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1302 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1303 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1304 } 1305 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1306 return true; 1307 } 1308 // no matching symbol so try for just file info 1309 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1310 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1311 buf, buflen, offset, dlinfo.dli_fname)) { 1312 return true; 1313 } 1314 } 1315 1316 // Handle non-dynamic manually: 1317 if (dlinfo.dli_fbase != NULL && 1318 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1319 dlinfo.dli_fbase)) { 1320 if (!Decoder::demangle(localbuf, buf, buflen)) { 1321 jio_snprintf(buf, buflen, "%s", localbuf); 1322 } 1323 return true; 1324 } 1325 } 1326 buf[0] = '\0'; 1327 if (offset != NULL) *offset = -1; 1328 return false; 1329} 1330 1331// ported from solaris version 1332bool os::dll_address_to_library_name(address addr, char* buf, 1333 int buflen, int* offset) { 1334 // buf is not optional, but offset is optional 1335 assert(buf != NULL, "sanity check"); 1336 1337 Dl_info dlinfo; 1338 1339 if (dladdr((void*)addr, &dlinfo) != 0) { 1340 if (dlinfo.dli_fname != NULL) { 1341 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1342 } 1343 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1344 *offset = addr - (address)dlinfo.dli_fbase; 1345 } 1346 return true; 1347 } 1348 1349 buf[0] = '\0'; 1350 if (offset) *offset = -1; 1351 return false; 1352} 1353 1354// Loads .dll/.so and 1355// in case of error it checks if .dll/.so was built for the 1356// same architecture as Hotspot is running on 1357 1358#ifdef __APPLE__ 1359void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1360 void * result= ::dlopen(filename, RTLD_LAZY); 1361 if (result != NULL) { 1362 // Successful loading 1363 return result; 1364 } 1365 1366 // Read system error message into ebuf 1367 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1368 ebuf[ebuflen-1]='\0'; 1369 1370 return NULL; 1371} 1372#else 1373void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1374{ 1375 void * result= ::dlopen(filename, RTLD_LAZY); 1376 if (result != NULL) { 1377 // Successful loading 1378 return result; 1379 } 1380 1381 Elf32_Ehdr elf_head; 1382 1383 // Read system error message into ebuf 1384 // It may or may not be overwritten below 1385 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1386 ebuf[ebuflen-1]='\0'; 1387 int diag_msg_max_length=ebuflen-strlen(ebuf); 1388 char* diag_msg_buf=ebuf+strlen(ebuf); 1389 1390 if (diag_msg_max_length==0) { 1391 // No more space in ebuf for additional diagnostics message 1392 return NULL; 1393 } 1394 1395 1396 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1397 1398 if (file_descriptor < 0) { 1399 // Can't open library, report dlerror() message 1400 return NULL; 1401 } 1402 1403 bool failed_to_read_elf_head= 1404 (sizeof(elf_head)!= 1405 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1406 1407 ::close(file_descriptor); 1408 if (failed_to_read_elf_head) { 1409 // file i/o error - report dlerror() msg 1410 return NULL; 1411 } 1412 1413 typedef struct { 1414 Elf32_Half code; // Actual value as defined in elf.h 1415 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1416 char elf_class; // 32 or 64 bit 1417 char endianess; // MSB or LSB 1418 char* name; // String representation 1419 } arch_t; 1420 1421 #ifndef EM_486 1422 #define EM_486 6 /* Intel 80486 */ 1423 #endif 1424 1425 #ifndef EM_MIPS_RS3_LE 1426 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1427 #endif 1428 1429 #ifndef EM_PPC64 1430 #define EM_PPC64 21 /* PowerPC64 */ 1431 #endif 1432 1433 #ifndef EM_S390 1434 #define EM_S390 22 /* IBM System/390 */ 1435 #endif 1436 1437 #ifndef EM_IA_64 1438 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1439 #endif 1440 1441 #ifndef EM_X86_64 1442 #define EM_X86_64 62 /* AMD x86-64 */ 1443 #endif 1444 1445 static const arch_t arch_array[]={ 1446 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1447 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1448 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1449 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1450 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1451 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1452 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1453 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1454 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1455 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1456 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1457 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1458 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1459 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1460 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1461 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1462 }; 1463 1464 #if (defined IA32) 1465 static Elf32_Half running_arch_code=EM_386; 1466 #elif (defined AMD64) 1467 static Elf32_Half running_arch_code=EM_X86_64; 1468 #elif (defined IA64) 1469 static Elf32_Half running_arch_code=EM_IA_64; 1470 #elif (defined __sparc) && (defined _LP64) 1471 static Elf32_Half running_arch_code=EM_SPARCV9; 1472 #elif (defined __sparc) && (!defined _LP64) 1473 static Elf32_Half running_arch_code=EM_SPARC; 1474 #elif (defined __powerpc64__) 1475 static Elf32_Half running_arch_code=EM_PPC64; 1476 #elif (defined __powerpc__) 1477 static Elf32_Half running_arch_code=EM_PPC; 1478 #elif (defined ARM) 1479 static Elf32_Half running_arch_code=EM_ARM; 1480 #elif (defined S390) 1481 static Elf32_Half running_arch_code=EM_S390; 1482 #elif (defined ALPHA) 1483 static Elf32_Half running_arch_code=EM_ALPHA; 1484 #elif (defined MIPSEL) 1485 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1486 #elif (defined PARISC) 1487 static Elf32_Half running_arch_code=EM_PARISC; 1488 #elif (defined MIPS) 1489 static Elf32_Half running_arch_code=EM_MIPS; 1490 #elif (defined M68K) 1491 static Elf32_Half running_arch_code=EM_68K; 1492 #else 1493 #error Method os::dll_load requires that one of following is defined:\ 1494 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1495 #endif 1496 1497 // Identify compatability class for VM's architecture and library's architecture 1498 // Obtain string descriptions for architectures 1499 1500 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1501 int running_arch_index=-1; 1502 1503 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1504 if (running_arch_code == arch_array[i].code) { 1505 running_arch_index = i; 1506 } 1507 if (lib_arch.code == arch_array[i].code) { 1508 lib_arch.compat_class = arch_array[i].compat_class; 1509 lib_arch.name = arch_array[i].name; 1510 } 1511 } 1512 1513 assert(running_arch_index != -1, 1514 "Didn't find running architecture code (running_arch_code) in arch_array"); 1515 if (running_arch_index == -1) { 1516 // Even though running architecture detection failed 1517 // we may still continue with reporting dlerror() message 1518 return NULL; 1519 } 1520 1521 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1522 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1523 return NULL; 1524 } 1525 1526#ifndef S390 1527 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1528 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1529 return NULL; 1530 } 1531#endif // !S390 1532 1533 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1534 if ( lib_arch.name!=NULL ) { 1535 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1536 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1537 lib_arch.name, arch_array[running_arch_index].name); 1538 } else { 1539 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1540 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1541 lib_arch.code, 1542 arch_array[running_arch_index].name); 1543 } 1544 } 1545 1546 return NULL; 1547} 1548#endif /* !__APPLE__ */ 1549 1550// XXX: Do we need a lock around this as per Linux? 1551void* os::dll_lookup(void* handle, const char* name) { 1552 return dlsym(handle, name); 1553} 1554 1555 1556static bool _print_ascii_file(const char* filename, outputStream* st) { 1557 int fd = ::open(filename, O_RDONLY); 1558 if (fd == -1) { 1559 return false; 1560 } 1561 1562 char buf[32]; 1563 int bytes; 1564 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1565 st->print_raw(buf, bytes); 1566 } 1567 1568 ::close(fd); 1569 1570 return true; 1571} 1572 1573void os::print_dll_info(outputStream *st) { 1574 st->print_cr("Dynamic libraries:"); 1575#ifdef RTLD_DI_LINKMAP 1576 Dl_info dli; 1577 void *handle; 1578 Link_map *map; 1579 Link_map *p; 1580 1581 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1582 dli.dli_fname == NULL) { 1583 st->print_cr("Error: Cannot print dynamic libraries."); 1584 return; 1585 } 1586 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1587 if (handle == NULL) { 1588 st->print_cr("Error: Cannot print dynamic libraries."); 1589 return; 1590 } 1591 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1592 if (map == NULL) { 1593 st->print_cr("Error: Cannot print dynamic libraries."); 1594 return; 1595 } 1596 1597 while (map->l_prev != NULL) 1598 map = map->l_prev; 1599 1600 while (map != NULL) { 1601 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1602 map = map->l_next; 1603 } 1604 1605 dlclose(handle); 1606#elif defined(__APPLE__) 1607 uint32_t count; 1608 uint32_t i; 1609 1610 count = _dyld_image_count(); 1611 for (i = 1; i < count; i++) { 1612 const char *name = _dyld_get_image_name(i); 1613 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1614 st->print_cr(PTR_FORMAT " \t%s", slide, name); 1615 } 1616#else 1617 st->print_cr("Error: Cannot print dynamic libraries."); 1618#endif 1619} 1620 1621void os::print_os_info_brief(outputStream* st) { 1622 st->print("Bsd"); 1623 1624 os::Posix::print_uname_info(st); 1625} 1626 1627void os::print_os_info(outputStream* st) { 1628 st->print("OS:"); 1629 st->print("Bsd"); 1630 1631 os::Posix::print_uname_info(st); 1632 1633 os::Posix::print_rlimit_info(st); 1634 1635 os::Posix::print_load_average(st); 1636} 1637 1638void os::pd_print_cpu_info(outputStream* st) { 1639 // Nothing to do for now. 1640} 1641 1642void os::print_memory_info(outputStream* st) { 1643 1644 st->print("Memory:"); 1645 st->print(" %dk page", os::vm_page_size()>>10); 1646 1647 st->print(", physical " UINT64_FORMAT "k", 1648 os::physical_memory() >> 10); 1649 st->print("(" UINT64_FORMAT "k free)", 1650 os::available_memory() >> 10); 1651 st->cr(); 1652 1653 // meminfo 1654 st->print("\n/proc/meminfo:\n"); 1655 _print_ascii_file("/proc/meminfo", st); 1656 st->cr(); 1657} 1658 1659// Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1660// but they're the same for all the bsd arch that we support 1661// and they're the same for solaris but there's no common place to put this. 1662const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1663 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1664 "ILL_COPROC", "ILL_BADSTK" }; 1665 1666const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1667 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1668 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1669 1670const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1671 1672const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1673 1674void os::print_siginfo(outputStream* st, void* siginfo) { 1675 st->print("siginfo:"); 1676 1677 const int buflen = 100; 1678 char buf[buflen]; 1679 siginfo_t *si = (siginfo_t*)siginfo; 1680 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1681 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1682 st->print("si_errno=%s", buf); 1683 } else { 1684 st->print("si_errno=%d", si->si_errno); 1685 } 1686 const int c = si->si_code; 1687 assert(c > 0, "unexpected si_code"); 1688 switch (si->si_signo) { 1689 case SIGILL: 1690 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1691 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1692 break; 1693 case SIGFPE: 1694 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1695 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1696 break; 1697 case SIGSEGV: 1698 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1699 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1700 break; 1701 case SIGBUS: 1702 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1703 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1704 break; 1705 default: 1706 st->print(", si_code=%d", si->si_code); 1707 // no si_addr 1708 } 1709 1710 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1711 UseSharedSpaces) { 1712 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1713 if (mapinfo->is_in_shared_space(si->si_addr)) { 1714 st->print("\n\nError accessing class data sharing archive." \ 1715 " Mapped file inaccessible during execution, " \ 1716 " possible disk/network problem."); 1717 } 1718 } 1719 st->cr(); 1720} 1721 1722 1723static void print_signal_handler(outputStream* st, int sig, 1724 char* buf, size_t buflen); 1725 1726void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1727 st->print_cr("Signal Handlers:"); 1728 print_signal_handler(st, SIGSEGV, buf, buflen); 1729 print_signal_handler(st, SIGBUS , buf, buflen); 1730 print_signal_handler(st, SIGFPE , buf, buflen); 1731 print_signal_handler(st, SIGPIPE, buf, buflen); 1732 print_signal_handler(st, SIGXFSZ, buf, buflen); 1733 print_signal_handler(st, SIGILL , buf, buflen); 1734 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1735 print_signal_handler(st, SR_signum, buf, buflen); 1736 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1737 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1738 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1739 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1740} 1741 1742static char saved_jvm_path[MAXPATHLEN] = {0}; 1743 1744// Find the full path to the current module, libjvm 1745void os::jvm_path(char *buf, jint buflen) { 1746 // Error checking. 1747 if (buflen < MAXPATHLEN) { 1748 assert(false, "must use a large-enough buffer"); 1749 buf[0] = '\0'; 1750 return; 1751 } 1752 // Lazy resolve the path to current module. 1753 if (saved_jvm_path[0] != 0) { 1754 strcpy(buf, saved_jvm_path); 1755 return; 1756 } 1757 1758 char dli_fname[MAXPATHLEN]; 1759 bool ret = dll_address_to_library_name( 1760 CAST_FROM_FN_PTR(address, os::jvm_path), 1761 dli_fname, sizeof(dli_fname), NULL); 1762 assert(ret, "cannot locate libjvm"); 1763 char *rp = NULL; 1764 if (ret && dli_fname[0] != '\0') { 1765 rp = realpath(dli_fname, buf); 1766 } 1767 if (rp == NULL) 1768 return; 1769 1770 if (Arguments::created_by_gamma_launcher()) { 1771 // Support for the gamma launcher. Typical value for buf is 1772 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1773 // the right place in the string, then assume we are installed in a JDK and 1774 // we're done. Otherwise, check for a JAVA_HOME environment variable and 1775 // construct a path to the JVM being overridden. 1776 1777 const char *p = buf + strlen(buf) - 1; 1778 for (int count = 0; p > buf && count < 5; ++count) { 1779 for (--p; p > buf && *p != '/'; --p) 1780 /* empty */ ; 1781 } 1782 1783 if (strncmp(p, "/jre/lib/", 9) != 0) { 1784 // Look for JAVA_HOME in the environment. 1785 char* java_home_var = ::getenv("JAVA_HOME"); 1786 if (java_home_var != NULL && java_home_var[0] != 0) { 1787 char* jrelib_p; 1788 int len; 1789 1790 // Check the current module name "libjvm" 1791 p = strrchr(buf, '/'); 1792 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1793 1794 rp = realpath(java_home_var, buf); 1795 if (rp == NULL) 1796 return; 1797 1798 // determine if this is a legacy image or modules image 1799 // modules image doesn't have "jre" subdirectory 1800 len = strlen(buf); 1801 jrelib_p = buf + len; 1802 1803 // Add the appropriate library subdir 1804 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1805 if (0 != access(buf, F_OK)) { 1806 snprintf(jrelib_p, buflen-len, "/lib"); 1807 } 1808 1809 // Add the appropriate client or server subdir 1810 len = strlen(buf); 1811 jrelib_p = buf + len; 1812 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1813 if (0 != access(buf, F_OK)) { 1814 snprintf(jrelib_p, buflen-len, ""); 1815 } 1816 1817 // If the path exists within JAVA_HOME, add the JVM library name 1818 // to complete the path to JVM being overridden. Otherwise fallback 1819 // to the path to the current library. 1820 if (0 == access(buf, F_OK)) { 1821 // Use current module name "libjvm" 1822 len = strlen(buf); 1823 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1824 } else { 1825 // Fall back to path of current library 1826 rp = realpath(dli_fname, buf); 1827 if (rp == NULL) 1828 return; 1829 } 1830 } 1831 } 1832 } 1833 1834 strcpy(saved_jvm_path, buf); 1835} 1836 1837void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1838 // no prefix required, not even "_" 1839} 1840 1841void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1842 // no suffix required 1843} 1844 1845//////////////////////////////////////////////////////////////////////////////// 1846// sun.misc.Signal support 1847 1848static volatile jint sigint_count = 0; 1849 1850static void 1851UserHandler(int sig, void *siginfo, void *context) { 1852 // 4511530 - sem_post is serialized and handled by the manager thread. When 1853 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1854 // don't want to flood the manager thread with sem_post requests. 1855 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1856 return; 1857 1858 // Ctrl-C is pressed during error reporting, likely because the error 1859 // handler fails to abort. Let VM die immediately. 1860 if (sig == SIGINT && is_error_reported()) { 1861 os::die(); 1862 } 1863 1864 os::signal_notify(sig); 1865} 1866 1867void* os::user_handler() { 1868 return CAST_FROM_FN_PTR(void*, UserHandler); 1869} 1870 1871extern "C" { 1872 typedef void (*sa_handler_t)(int); 1873 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1874} 1875 1876void* os::signal(int signal_number, void* handler) { 1877 struct sigaction sigAct, oldSigAct; 1878 1879 sigfillset(&(sigAct.sa_mask)); 1880 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1881 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1882 1883 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1884 // -1 means registration failed 1885 return (void *)-1; 1886 } 1887 1888 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1889} 1890 1891void os::signal_raise(int signal_number) { 1892 ::raise(signal_number); 1893} 1894 1895/* 1896 * The following code is moved from os.cpp for making this 1897 * code platform specific, which it is by its very nature. 1898 */ 1899 1900// Will be modified when max signal is changed to be dynamic 1901int os::sigexitnum_pd() { 1902 return NSIG; 1903} 1904 1905// a counter for each possible signal value 1906static volatile jint pending_signals[NSIG+1] = { 0 }; 1907 1908// Bsd(POSIX) specific hand shaking semaphore. 1909#ifdef __APPLE__ 1910typedef semaphore_t os_semaphore_t; 1911#define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1912#define SEM_WAIT(sem) semaphore_wait(sem) 1913#define SEM_POST(sem) semaphore_signal(sem) 1914#define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1915#else 1916typedef sem_t os_semaphore_t; 1917#define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1918#define SEM_WAIT(sem) sem_wait(&sem) 1919#define SEM_POST(sem) sem_post(&sem) 1920#define SEM_DESTROY(sem) sem_destroy(&sem) 1921#endif 1922 1923class Semaphore : public StackObj { 1924 public: 1925 Semaphore(); 1926 ~Semaphore(); 1927 void signal(); 1928 void wait(); 1929 bool trywait(); 1930 bool timedwait(unsigned int sec, int nsec); 1931 private: 1932 jlong currenttime() const; 1933 os_semaphore_t _semaphore; 1934}; 1935 1936Semaphore::Semaphore() : _semaphore(0) { 1937 SEM_INIT(_semaphore, 0); 1938} 1939 1940Semaphore::~Semaphore() { 1941 SEM_DESTROY(_semaphore); 1942} 1943 1944void Semaphore::signal() { 1945 SEM_POST(_semaphore); 1946} 1947 1948void Semaphore::wait() { 1949 SEM_WAIT(_semaphore); 1950} 1951 1952jlong Semaphore::currenttime() const { 1953 struct timeval tv; 1954 gettimeofday(&tv, NULL); 1955 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1956} 1957 1958#ifdef __APPLE__ 1959bool Semaphore::trywait() { 1960 return timedwait(0, 0); 1961} 1962 1963bool Semaphore::timedwait(unsigned int sec, int nsec) { 1964 kern_return_t kr = KERN_ABORTED; 1965 mach_timespec_t waitspec; 1966 waitspec.tv_sec = sec; 1967 waitspec.tv_nsec = nsec; 1968 1969 jlong starttime = currenttime(); 1970 1971 kr = semaphore_timedwait(_semaphore, waitspec); 1972 while (kr == KERN_ABORTED) { 1973 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1974 1975 jlong current = currenttime(); 1976 jlong passedtime = current - starttime; 1977 1978 if (passedtime >= totalwait) { 1979 waitspec.tv_sec = 0; 1980 waitspec.tv_nsec = 0; 1981 } else { 1982 jlong waittime = totalwait - (current - starttime); 1983 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1984 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1985 } 1986 1987 kr = semaphore_timedwait(_semaphore, waitspec); 1988 } 1989 1990 return kr == KERN_SUCCESS; 1991} 1992 1993#else 1994 1995bool Semaphore::trywait() { 1996 return sem_trywait(&_semaphore) == 0; 1997} 1998 1999bool Semaphore::timedwait(unsigned int sec, int nsec) { 2000 struct timespec ts; 2001 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2002 2003 while (1) { 2004 int result = sem_timedwait(&_semaphore, &ts); 2005 if (result == 0) { 2006 return true; 2007 } else if (errno == EINTR) { 2008 continue; 2009 } else if (errno == ETIMEDOUT) { 2010 return false; 2011 } else { 2012 return false; 2013 } 2014 } 2015} 2016 2017#endif // __APPLE__ 2018 2019static os_semaphore_t sig_sem; 2020static Semaphore sr_semaphore; 2021 2022void os::signal_init_pd() { 2023 // Initialize signal structures 2024 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2025 2026 // Initialize signal semaphore 2027 ::SEM_INIT(sig_sem, 0); 2028} 2029 2030void os::signal_notify(int sig) { 2031 Atomic::inc(&pending_signals[sig]); 2032 ::SEM_POST(sig_sem); 2033} 2034 2035static int check_pending_signals(bool wait) { 2036 Atomic::store(0, &sigint_count); 2037 for (;;) { 2038 for (int i = 0; i < NSIG + 1; i++) { 2039 jint n = pending_signals[i]; 2040 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2041 return i; 2042 } 2043 } 2044 if (!wait) { 2045 return -1; 2046 } 2047 JavaThread *thread = JavaThread::current(); 2048 ThreadBlockInVM tbivm(thread); 2049 2050 bool threadIsSuspended; 2051 do { 2052 thread->set_suspend_equivalent(); 2053 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2054 ::SEM_WAIT(sig_sem); 2055 2056 // were we externally suspended while we were waiting? 2057 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2058 if (threadIsSuspended) { 2059 // 2060 // The semaphore has been incremented, but while we were waiting 2061 // another thread suspended us. We don't want to continue running 2062 // while suspended because that would surprise the thread that 2063 // suspended us. 2064 // 2065 ::SEM_POST(sig_sem); 2066 2067 thread->java_suspend_self(); 2068 } 2069 } while (threadIsSuspended); 2070 } 2071} 2072 2073int os::signal_lookup() { 2074 return check_pending_signals(false); 2075} 2076 2077int os::signal_wait() { 2078 return check_pending_signals(true); 2079} 2080 2081//////////////////////////////////////////////////////////////////////////////// 2082// Virtual Memory 2083 2084int os::vm_page_size() { 2085 // Seems redundant as all get out 2086 assert(os::Bsd::page_size() != -1, "must call os::init"); 2087 return os::Bsd::page_size(); 2088} 2089 2090// Solaris allocates memory by pages. 2091int os::vm_allocation_granularity() { 2092 assert(os::Bsd::page_size() != -1, "must call os::init"); 2093 return os::Bsd::page_size(); 2094} 2095 2096// Rationale behind this function: 2097// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2098// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2099// samples for JITted code. Here we create private executable mapping over the code cache 2100// and then we can use standard (well, almost, as mapping can change) way to provide 2101// info for the reporting script by storing timestamp and location of symbol 2102void bsd_wrap_code(char* base, size_t size) { 2103 static volatile jint cnt = 0; 2104 2105 if (!UseOprofile) { 2106 return; 2107 } 2108 2109 char buf[PATH_MAX + 1]; 2110 int num = Atomic::add(1, &cnt); 2111 2112 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2113 os::get_temp_directory(), os::current_process_id(), num); 2114 unlink(buf); 2115 2116 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2117 2118 if (fd != -1) { 2119 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2120 if (rv != (off_t)-1) { 2121 if (::write(fd, "", 1) == 1) { 2122 mmap(base, size, 2123 PROT_READ|PROT_WRITE|PROT_EXEC, 2124 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2125 } 2126 } 2127 ::close(fd); 2128 unlink(buf); 2129 } 2130} 2131 2132static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2133 int err) { 2134 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2135 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2136 strerror(err), err); 2137} 2138 2139// NOTE: Bsd kernel does not really reserve the pages for us. 2140// All it does is to check if there are enough free pages 2141// left at the time of mmap(). This could be a potential 2142// problem. 2143bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2144 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2145#ifdef __OpenBSD__ 2146 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2147 if (::mprotect(addr, size, prot) == 0) { 2148 return true; 2149 } 2150#else 2151 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2152 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2153 if (res != (uintptr_t) MAP_FAILED) { 2154 return true; 2155 } 2156#endif 2157 2158 // Warn about any commit errors we see in non-product builds just 2159 // in case mmap() doesn't work as described on the man page. 2160 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2161 2162 return false; 2163} 2164 2165bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2166 bool exec) { 2167 // alignment_hint is ignored on this OS 2168 return pd_commit_memory(addr, size, exec); 2169} 2170 2171void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2172 const char* mesg) { 2173 assert(mesg != NULL, "mesg must be specified"); 2174 if (!pd_commit_memory(addr, size, exec)) { 2175 // add extra info in product mode for vm_exit_out_of_memory(): 2176 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2177 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 2178 } 2179} 2180 2181void os::pd_commit_memory_or_exit(char* addr, size_t size, 2182 size_t alignment_hint, bool exec, 2183 const char* mesg) { 2184 // alignment_hint is ignored on this OS 2185 pd_commit_memory_or_exit(addr, size, exec, mesg); 2186} 2187 2188void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2189} 2190 2191void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2192 ::madvise(addr, bytes, MADV_DONTNEED); 2193} 2194 2195void os::numa_make_global(char *addr, size_t bytes) { 2196} 2197 2198void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2199} 2200 2201bool os::numa_topology_changed() { return false; } 2202 2203size_t os::numa_get_groups_num() { 2204 return 1; 2205} 2206 2207int os::numa_get_group_id() { 2208 return 0; 2209} 2210 2211size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2212 if (size > 0) { 2213 ids[0] = 0; 2214 return 1; 2215 } 2216 return 0; 2217} 2218 2219bool os::get_page_info(char *start, page_info* info) { 2220 return false; 2221} 2222 2223char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2224 return end; 2225} 2226 2227 2228bool os::pd_uncommit_memory(char* addr, size_t size) { 2229#ifdef __OpenBSD__ 2230 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2231 return ::mprotect(addr, size, PROT_NONE) == 0; 2232#else 2233 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2234 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2235 return res != (uintptr_t) MAP_FAILED; 2236#endif 2237} 2238 2239bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2240 return os::commit_memory(addr, size, !ExecMem); 2241} 2242 2243// If this is a growable mapping, remove the guard pages entirely by 2244// munmap()ping them. If not, just call uncommit_memory(). 2245bool os::remove_stack_guard_pages(char* addr, size_t size) { 2246 return os::uncommit_memory(addr, size); 2247} 2248 2249static address _highest_vm_reserved_address = NULL; 2250 2251// If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2252// at 'requested_addr'. If there are existing memory mappings at the same 2253// location, however, they will be overwritten. If 'fixed' is false, 2254// 'requested_addr' is only treated as a hint, the return value may or 2255// may not start from the requested address. Unlike Bsd mmap(), this 2256// function returns NULL to indicate failure. 2257static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2258 char * addr; 2259 int flags; 2260 2261 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2262 if (fixed) { 2263 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2264 flags |= MAP_FIXED; 2265 } 2266 2267 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2268 // touch an uncommitted page. Otherwise, the read/write might 2269 // succeed if we have enough swap space to back the physical page. 2270 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2271 flags, -1, 0); 2272 2273 if (addr != MAP_FAILED) { 2274 // anon_mmap() should only get called during VM initialization, 2275 // don't need lock (actually we can skip locking even it can be called 2276 // from multiple threads, because _highest_vm_reserved_address is just a 2277 // hint about the upper limit of non-stack memory regions.) 2278 if ((address)addr + bytes > _highest_vm_reserved_address) { 2279 _highest_vm_reserved_address = (address)addr + bytes; 2280 } 2281 } 2282 2283 return addr == MAP_FAILED ? NULL : addr; 2284} 2285 2286// Don't update _highest_vm_reserved_address, because there might be memory 2287// regions above addr + size. If so, releasing a memory region only creates 2288// a hole in the address space, it doesn't help prevent heap-stack collision. 2289// 2290static int anon_munmap(char * addr, size_t size) { 2291 return ::munmap(addr, size) == 0; 2292} 2293 2294char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2295 size_t alignment_hint) { 2296 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2297} 2298 2299bool os::pd_release_memory(char* addr, size_t size) { 2300 return anon_munmap(addr, size); 2301} 2302 2303static bool bsd_mprotect(char* addr, size_t size, int prot) { 2304 // Bsd wants the mprotect address argument to be page aligned. 2305 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2306 2307 // According to SUSv3, mprotect() should only be used with mappings 2308 // established by mmap(), and mmap() always maps whole pages. Unaligned 2309 // 'addr' likely indicates problem in the VM (e.g. trying to change 2310 // protection of malloc'ed or statically allocated memory). Check the 2311 // caller if you hit this assert. 2312 assert(addr == bottom, "sanity check"); 2313 2314 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2315 return ::mprotect(bottom, size, prot) == 0; 2316} 2317 2318// Set protections specified 2319bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2320 bool is_committed) { 2321 unsigned int p = 0; 2322 switch (prot) { 2323 case MEM_PROT_NONE: p = PROT_NONE; break; 2324 case MEM_PROT_READ: p = PROT_READ; break; 2325 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2326 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2327 default: 2328 ShouldNotReachHere(); 2329 } 2330 // is_committed is unused. 2331 return bsd_mprotect(addr, bytes, p); 2332} 2333 2334bool os::guard_memory(char* addr, size_t size) { 2335 return bsd_mprotect(addr, size, PROT_NONE); 2336} 2337 2338bool os::unguard_memory(char* addr, size_t size) { 2339 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2340} 2341 2342bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2343 return false; 2344} 2345 2346// Large page support 2347 2348static size_t _large_page_size = 0; 2349 2350void os::large_page_init() { 2351} 2352 2353 2354char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2355 fatal("This code is not used or maintained."); 2356 2357 // "exec" is passed in but not used. Creating the shared image for 2358 // the code cache doesn't have an SHM_X executable permission to check. 2359 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2360 2361 key_t key = IPC_PRIVATE; 2362 char *addr; 2363 2364 bool warn_on_failure = UseLargePages && 2365 (!FLAG_IS_DEFAULT(UseLargePages) || 2366 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2367 ); 2368 char msg[128]; 2369 2370 // Create a large shared memory region to attach to based on size. 2371 // Currently, size is the total size of the heap 2372 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2373 if (shmid == -1) { 2374 // Possible reasons for shmget failure: 2375 // 1. shmmax is too small for Java heap. 2376 // > check shmmax value: cat /proc/sys/kernel/shmmax 2377 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2378 // 2. not enough large page memory. 2379 // > check available large pages: cat /proc/meminfo 2380 // > increase amount of large pages: 2381 // echo new_value > /proc/sys/vm/nr_hugepages 2382 // Note 1: different Bsd may use different name for this property, 2383 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2384 // Note 2: it's possible there's enough physical memory available but 2385 // they are so fragmented after a long run that they can't 2386 // coalesce into large pages. Try to reserve large pages when 2387 // the system is still "fresh". 2388 if (warn_on_failure) { 2389 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2390 warning(msg); 2391 } 2392 return NULL; 2393 } 2394 2395 // attach to the region 2396 addr = (char*)shmat(shmid, req_addr, 0); 2397 int err = errno; 2398 2399 // Remove shmid. If shmat() is successful, the actual shared memory segment 2400 // will be deleted when it's detached by shmdt() or when the process 2401 // terminates. If shmat() is not successful this will remove the shared 2402 // segment immediately. 2403 shmctl(shmid, IPC_RMID, NULL); 2404 2405 if ((intptr_t)addr == -1) { 2406 if (warn_on_failure) { 2407 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2408 warning(msg); 2409 } 2410 return NULL; 2411 } 2412 2413 // The memory is committed 2414 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); 2415 2416 return addr; 2417} 2418 2419bool os::release_memory_special(char* base, size_t bytes) { 2420 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2421 // detaching the SHM segment will also delete it, see reserve_memory_special() 2422 int rslt = shmdt(base); 2423 if (rslt == 0) { 2424 tkr.record((address)base, bytes); 2425 return true; 2426 } else { 2427 tkr.discard(); 2428 return false; 2429 } 2430 2431} 2432 2433size_t os::large_page_size() { 2434 return _large_page_size; 2435} 2436 2437// HugeTLBFS allows application to commit large page memory on demand; 2438// with SysV SHM the entire memory region must be allocated as shared 2439// memory. 2440bool os::can_commit_large_page_memory() { 2441 return UseHugeTLBFS; 2442} 2443 2444bool os::can_execute_large_page_memory() { 2445 return UseHugeTLBFS; 2446} 2447 2448// Reserve memory at an arbitrary address, only if that area is 2449// available (and not reserved for something else). 2450 2451char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2452 const int max_tries = 10; 2453 char* base[max_tries]; 2454 size_t size[max_tries]; 2455 const size_t gap = 0x000000; 2456 2457 // Assert only that the size is a multiple of the page size, since 2458 // that's all that mmap requires, and since that's all we really know 2459 // about at this low abstraction level. If we need higher alignment, 2460 // we can either pass an alignment to this method or verify alignment 2461 // in one of the methods further up the call chain. See bug 5044738. 2462 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2463 2464 // Repeatedly allocate blocks until the block is allocated at the 2465 // right spot. Give up after max_tries. Note that reserve_memory() will 2466 // automatically update _highest_vm_reserved_address if the call is 2467 // successful. The variable tracks the highest memory address every reserved 2468 // by JVM. It is used to detect heap-stack collision if running with 2469 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2470 // space than needed, it could confuse the collision detecting code. To 2471 // solve the problem, save current _highest_vm_reserved_address and 2472 // calculate the correct value before return. 2473 address old_highest = _highest_vm_reserved_address; 2474 2475 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2476 // if kernel honors the hint then we can return immediately. 2477 char * addr = anon_mmap(requested_addr, bytes, false); 2478 if (addr == requested_addr) { 2479 return requested_addr; 2480 } 2481 2482 if (addr != NULL) { 2483 // mmap() is successful but it fails to reserve at the requested address 2484 anon_munmap(addr, bytes); 2485 } 2486 2487 int i; 2488 for (i = 0; i < max_tries; ++i) { 2489 base[i] = reserve_memory(bytes); 2490 2491 if (base[i] != NULL) { 2492 // Is this the block we wanted? 2493 if (base[i] == requested_addr) { 2494 size[i] = bytes; 2495 break; 2496 } 2497 2498 // Does this overlap the block we wanted? Give back the overlapped 2499 // parts and try again. 2500 2501 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2502 if (top_overlap >= 0 && top_overlap < bytes) { 2503 unmap_memory(base[i], top_overlap); 2504 base[i] += top_overlap; 2505 size[i] = bytes - top_overlap; 2506 } else { 2507 size_t bottom_overlap = base[i] + bytes - requested_addr; 2508 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2509 unmap_memory(requested_addr, bottom_overlap); 2510 size[i] = bytes - bottom_overlap; 2511 } else { 2512 size[i] = bytes; 2513 } 2514 } 2515 } 2516 } 2517 2518 // Give back the unused reserved pieces. 2519 2520 for (int j = 0; j < i; ++j) { 2521 if (base[j] != NULL) { 2522 unmap_memory(base[j], size[j]); 2523 } 2524 } 2525 2526 if (i < max_tries) { 2527 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2528 return requested_addr; 2529 } else { 2530 _highest_vm_reserved_address = old_highest; 2531 return NULL; 2532 } 2533} 2534 2535size_t os::read(int fd, void *buf, unsigned int nBytes) { 2536 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2537} 2538 2539// TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2540// Solaris uses poll(), bsd uses park(). 2541// Poll() is likely a better choice, assuming that Thread.interrupt() 2542// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2543// SIGSEGV, see 4355769. 2544 2545int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2546 assert(thread == Thread::current(), "thread consistency check"); 2547 2548 ParkEvent * const slp = thread->_SleepEvent ; 2549 slp->reset() ; 2550 OrderAccess::fence() ; 2551 2552 if (interruptible) { 2553 jlong prevtime = javaTimeNanos(); 2554 2555 for (;;) { 2556 if (os::is_interrupted(thread, true)) { 2557 return OS_INTRPT; 2558 } 2559 2560 jlong newtime = javaTimeNanos(); 2561 2562 if (newtime - prevtime < 0) { 2563 // time moving backwards, should only happen if no monotonic clock 2564 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2565 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2566 } else { 2567 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2568 } 2569 2570 if(millis <= 0) { 2571 return OS_OK; 2572 } 2573 2574 prevtime = newtime; 2575 2576 { 2577 assert(thread->is_Java_thread(), "sanity check"); 2578 JavaThread *jt = (JavaThread *) thread; 2579 ThreadBlockInVM tbivm(jt); 2580 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2581 2582 jt->set_suspend_equivalent(); 2583 // cleared by handle_special_suspend_equivalent_condition() or 2584 // java_suspend_self() via check_and_wait_while_suspended() 2585 2586 slp->park(millis); 2587 2588 // were we externally suspended while we were waiting? 2589 jt->check_and_wait_while_suspended(); 2590 } 2591 } 2592 } else { 2593 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2594 jlong prevtime = javaTimeNanos(); 2595 2596 for (;;) { 2597 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2598 // the 1st iteration ... 2599 jlong newtime = javaTimeNanos(); 2600 2601 if (newtime - prevtime < 0) { 2602 // time moving backwards, should only happen if no monotonic clock 2603 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2604 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2605 } else { 2606 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2607 } 2608 2609 if(millis <= 0) break ; 2610 2611 prevtime = newtime; 2612 slp->park(millis); 2613 } 2614 return OS_OK ; 2615 } 2616} 2617 2618int os::naked_sleep() { 2619 // %% make the sleep time an integer flag. for now use 1 millisec. 2620 return os::sleep(Thread::current(), 1, false); 2621} 2622 2623// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2624void os::infinite_sleep() { 2625 while (true) { // sleep forever ... 2626 ::sleep(100); // ... 100 seconds at a time 2627 } 2628} 2629 2630// Used to convert frequent JVM_Yield() to nops 2631bool os::dont_yield() { 2632 return DontYieldALot; 2633} 2634 2635void os::yield() { 2636 sched_yield(); 2637} 2638 2639os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2640 2641void os::yield_all(int attempts) { 2642 // Yields to all threads, including threads with lower priorities 2643 // Threads on Bsd are all with same priority. The Solaris style 2644 // os::yield_all() with nanosleep(1ms) is not necessary. 2645 sched_yield(); 2646} 2647 2648// Called from the tight loops to possibly influence time-sharing heuristics 2649void os::loop_breaker(int attempts) { 2650 os::yield_all(attempts); 2651} 2652 2653//////////////////////////////////////////////////////////////////////////////// 2654// thread priority support 2655 2656// Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2657// only supports dynamic priority, static priority must be zero. For real-time 2658// applications, Bsd supports SCHED_RR which allows static priority (1-99). 2659// However, for large multi-threaded applications, SCHED_RR is not only slower 2660// than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2661// of 5 runs - Sep 2005). 2662// 2663// The following code actually changes the niceness of kernel-thread/LWP. It 2664// has an assumption that setpriority() only modifies one kernel-thread/LWP, 2665// not the entire user process, and user level threads are 1:1 mapped to kernel 2666// threads. It has always been the case, but could change in the future. For 2667// this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2668// It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2669 2670#if !defined(__APPLE__) 2671int os::java_to_os_priority[CriticalPriority + 1] = { 2672 19, // 0 Entry should never be used 2673 2674 0, // 1 MinPriority 2675 3, // 2 2676 6, // 3 2677 2678 10, // 4 2679 15, // 5 NormPriority 2680 18, // 6 2681 2682 21, // 7 2683 25, // 8 2684 28, // 9 NearMaxPriority 2685 2686 31, // 10 MaxPriority 2687 2688 31 // 11 CriticalPriority 2689}; 2690#else 2691/* Using Mach high-level priority assignments */ 2692int os::java_to_os_priority[CriticalPriority + 1] = { 2693 0, // 0 Entry should never be used (MINPRI_USER) 2694 2695 27, // 1 MinPriority 2696 28, // 2 2697 29, // 3 2698 2699 30, // 4 2700 31, // 5 NormPriority (BASEPRI_DEFAULT) 2701 32, // 6 2702 2703 33, // 7 2704 34, // 8 2705 35, // 9 NearMaxPriority 2706 2707 36, // 10 MaxPriority 2708 2709 36 // 11 CriticalPriority 2710}; 2711#endif 2712 2713static int prio_init() { 2714 if (ThreadPriorityPolicy == 1) { 2715 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2716 // if effective uid is not root. Perhaps, a more elegant way of doing 2717 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2718 if (geteuid() != 0) { 2719 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2720 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2721 } 2722 ThreadPriorityPolicy = 0; 2723 } 2724 } 2725 if (UseCriticalJavaThreadPriority) { 2726 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2727 } 2728 return 0; 2729} 2730 2731OSReturn os::set_native_priority(Thread* thread, int newpri) { 2732 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2733 2734#ifdef __OpenBSD__ 2735 // OpenBSD pthread_setprio starves low priority threads 2736 return OS_OK; 2737#elif defined(__FreeBSD__) 2738 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2739#elif defined(__APPLE__) || defined(__NetBSD__) 2740 struct sched_param sp; 2741 int policy; 2742 pthread_t self = pthread_self(); 2743 2744 if (pthread_getschedparam(self, &policy, &sp) != 0) 2745 return OS_ERR; 2746 2747 sp.sched_priority = newpri; 2748 if (pthread_setschedparam(self, policy, &sp) != 0) 2749 return OS_ERR; 2750 2751 return OS_OK; 2752#else 2753 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2754 return (ret == 0) ? OS_OK : OS_ERR; 2755#endif 2756} 2757 2758OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2759 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2760 *priority_ptr = java_to_os_priority[NormPriority]; 2761 return OS_OK; 2762 } 2763 2764 errno = 0; 2765#if defined(__OpenBSD__) || defined(__FreeBSD__) 2766 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2767#elif defined(__APPLE__) || defined(__NetBSD__) 2768 int policy; 2769 struct sched_param sp; 2770 2771 pthread_getschedparam(pthread_self(), &policy, &sp); 2772 *priority_ptr = sp.sched_priority; 2773#else 2774 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2775#endif 2776 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2777} 2778 2779// Hint to the underlying OS that a task switch would not be good. 2780// Void return because it's a hint and can fail. 2781void os::hint_no_preempt() {} 2782 2783//////////////////////////////////////////////////////////////////////////////// 2784// suspend/resume support 2785 2786// the low-level signal-based suspend/resume support is a remnant from the 2787// old VM-suspension that used to be for java-suspension, safepoints etc, 2788// within hotspot. Now there is a single use-case for this: 2789// - calling get_thread_pc() on the VMThread by the flat-profiler task 2790// that runs in the watcher thread. 2791// The remaining code is greatly simplified from the more general suspension 2792// code that used to be used. 2793// 2794// The protocol is quite simple: 2795// - suspend: 2796// - sends a signal to the target thread 2797// - polls the suspend state of the osthread using a yield loop 2798// - target thread signal handler (SR_handler) sets suspend state 2799// and blocks in sigsuspend until continued 2800// - resume: 2801// - sets target osthread state to continue 2802// - sends signal to end the sigsuspend loop in the SR_handler 2803// 2804// Note that the SR_lock plays no role in this suspend/resume protocol. 2805// 2806 2807static void resume_clear_context(OSThread *osthread) { 2808 osthread->set_ucontext(NULL); 2809 osthread->set_siginfo(NULL); 2810} 2811 2812static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2813 osthread->set_ucontext(context); 2814 osthread->set_siginfo(siginfo); 2815} 2816 2817// 2818// Handler function invoked when a thread's execution is suspended or 2819// resumed. We have to be careful that only async-safe functions are 2820// called here (Note: most pthread functions are not async safe and 2821// should be avoided.) 2822// 2823// Note: sigwait() is a more natural fit than sigsuspend() from an 2824// interface point of view, but sigwait() prevents the signal hander 2825// from being run. libpthread would get very confused by not having 2826// its signal handlers run and prevents sigwait()'s use with the 2827// mutex granting granting signal. 2828// 2829// Currently only ever called on the VMThread or JavaThread 2830// 2831static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2832 // Save and restore errno to avoid confusing native code with EINTR 2833 // after sigsuspend. 2834 int old_errno = errno; 2835 2836 Thread* thread = Thread::current(); 2837 OSThread* osthread = thread->osthread(); 2838 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2839 2840 os::SuspendResume::State current = osthread->sr.state(); 2841 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2842 suspend_save_context(osthread, siginfo, context); 2843 2844 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2845 os::SuspendResume::State state = osthread->sr.suspended(); 2846 if (state == os::SuspendResume::SR_SUSPENDED) { 2847 sigset_t suspend_set; // signals for sigsuspend() 2848 2849 // get current set of blocked signals and unblock resume signal 2850 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2851 sigdelset(&suspend_set, SR_signum); 2852 2853 sr_semaphore.signal(); 2854 // wait here until we are resumed 2855 while (1) { 2856 sigsuspend(&suspend_set); 2857 2858 os::SuspendResume::State result = osthread->sr.running(); 2859 if (result == os::SuspendResume::SR_RUNNING) { 2860 sr_semaphore.signal(); 2861 break; 2862 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2863 ShouldNotReachHere(); 2864 } 2865 } 2866 2867 } else if (state == os::SuspendResume::SR_RUNNING) { 2868 // request was cancelled, continue 2869 } else { 2870 ShouldNotReachHere(); 2871 } 2872 2873 resume_clear_context(osthread); 2874 } else if (current == os::SuspendResume::SR_RUNNING) { 2875 // request was cancelled, continue 2876 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2877 // ignore 2878 } else { 2879 // ignore 2880 } 2881 2882 errno = old_errno; 2883} 2884 2885 2886static int SR_initialize() { 2887 struct sigaction act; 2888 char *s; 2889 /* Get signal number to use for suspend/resume */ 2890 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2891 int sig = ::strtol(s, 0, 10); 2892 if (sig > 0 || sig < NSIG) { 2893 SR_signum = sig; 2894 } 2895 } 2896 2897 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2898 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2899 2900 sigemptyset(&SR_sigset); 2901 sigaddset(&SR_sigset, SR_signum); 2902 2903 /* Set up signal handler for suspend/resume */ 2904 act.sa_flags = SA_RESTART|SA_SIGINFO; 2905 act.sa_handler = (void (*)(int)) SR_handler; 2906 2907 // SR_signum is blocked by default. 2908 // 4528190 - We also need to block pthread restart signal (32 on all 2909 // supported Bsd platforms). Note that BsdThreads need to block 2910 // this signal for all threads to work properly. So we don't have 2911 // to use hard-coded signal number when setting up the mask. 2912 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2913 2914 if (sigaction(SR_signum, &act, 0) == -1) { 2915 return -1; 2916 } 2917 2918 // Save signal flag 2919 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2920 return 0; 2921} 2922 2923static int sr_notify(OSThread* osthread) { 2924 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2925 assert_status(status == 0, status, "pthread_kill"); 2926 return status; 2927} 2928 2929// "Randomly" selected value for how long we want to spin 2930// before bailing out on suspending a thread, also how often 2931// we send a signal to a thread we want to resume 2932static const int RANDOMLY_LARGE_INTEGER = 1000000; 2933static const int RANDOMLY_LARGE_INTEGER2 = 100; 2934 2935// returns true on success and false on error - really an error is fatal 2936// but this seems the normal response to library errors 2937static bool do_suspend(OSThread* osthread) { 2938 assert(osthread->sr.is_running(), "thread should be running"); 2939 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2940 2941 // mark as suspended and send signal 2942 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2943 // failed to switch, state wasn't running? 2944 ShouldNotReachHere(); 2945 return false; 2946 } 2947 2948 if (sr_notify(osthread) != 0) { 2949 ShouldNotReachHere(); 2950 } 2951 2952 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2953 while (true) { 2954 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2955 break; 2956 } else { 2957 // timeout 2958 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2959 if (cancelled == os::SuspendResume::SR_RUNNING) { 2960 return false; 2961 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2962 // make sure that we consume the signal on the semaphore as well 2963 sr_semaphore.wait(); 2964 break; 2965 } else { 2966 ShouldNotReachHere(); 2967 return false; 2968 } 2969 } 2970 } 2971 2972 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2973 return true; 2974} 2975 2976static void do_resume(OSThread* osthread) { 2977 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2978 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2979 2980 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2981 // failed to switch to WAKEUP_REQUEST 2982 ShouldNotReachHere(); 2983 return; 2984 } 2985 2986 while (true) { 2987 if (sr_notify(osthread) == 0) { 2988 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2989 if (osthread->sr.is_running()) { 2990 return; 2991 } 2992 } 2993 } else { 2994 ShouldNotReachHere(); 2995 } 2996 } 2997 2998 guarantee(osthread->sr.is_running(), "Must be running!"); 2999} 3000 3001//////////////////////////////////////////////////////////////////////////////// 3002// interrupt support 3003 3004void os::interrupt(Thread* thread) { 3005 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3006 "possibility of dangling Thread pointer"); 3007 3008 OSThread* osthread = thread->osthread(); 3009 3010 if (!osthread->interrupted()) { 3011 osthread->set_interrupted(true); 3012 // More than one thread can get here with the same value of osthread, 3013 // resulting in multiple notifications. We do, however, want the store 3014 // to interrupted() to be visible to other threads before we execute unpark(). 3015 OrderAccess::fence(); 3016 ParkEvent * const slp = thread->_SleepEvent ; 3017 if (slp != NULL) slp->unpark() ; 3018 } 3019 3020 // For JSR166. Unpark even if interrupt status already was set 3021 if (thread->is_Java_thread()) 3022 ((JavaThread*)thread)->parker()->unpark(); 3023 3024 ParkEvent * ev = thread->_ParkEvent ; 3025 if (ev != NULL) ev->unpark() ; 3026 3027} 3028 3029bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3030 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3031 "possibility of dangling Thread pointer"); 3032 3033 OSThread* osthread = thread->osthread(); 3034 3035 bool interrupted = osthread->interrupted(); 3036 3037 if (interrupted && clear_interrupted) { 3038 osthread->set_interrupted(false); 3039 // consider thread->_SleepEvent->reset() ... optional optimization 3040 } 3041 3042 return interrupted; 3043} 3044 3045/////////////////////////////////////////////////////////////////////////////////// 3046// signal handling (except suspend/resume) 3047 3048// This routine may be used by user applications as a "hook" to catch signals. 3049// The user-defined signal handler must pass unrecognized signals to this 3050// routine, and if it returns true (non-zero), then the signal handler must 3051// return immediately. If the flag "abort_if_unrecognized" is true, then this 3052// routine will never retun false (zero), but instead will execute a VM panic 3053// routine kill the process. 3054// 3055// If this routine returns false, it is OK to call it again. This allows 3056// the user-defined signal handler to perform checks either before or after 3057// the VM performs its own checks. Naturally, the user code would be making 3058// a serious error if it tried to handle an exception (such as a null check 3059// or breakpoint) that the VM was generating for its own correct operation. 3060// 3061// This routine may recognize any of the following kinds of signals: 3062// SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 3063// It should be consulted by handlers for any of those signals. 3064// 3065// The caller of this routine must pass in the three arguments supplied 3066// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3067// field of the structure passed to sigaction(). This routine assumes that 3068// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3069// 3070// Note that the VM will print warnings if it detects conflicting signal 3071// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3072// 3073extern "C" JNIEXPORT int 3074JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 3075 void* ucontext, int abort_if_unrecognized); 3076 3077void signalHandler(int sig, siginfo_t* info, void* uc) { 3078 assert(info != NULL && uc != NULL, "it must be old kernel"); 3079 int orig_errno = errno; // Preserve errno value over signal handler. 3080 JVM_handle_bsd_signal(sig, info, uc, true); 3081 errno = orig_errno; 3082} 3083 3084 3085// This boolean allows users to forward their own non-matching signals 3086// to JVM_handle_bsd_signal, harmlessly. 3087bool os::Bsd::signal_handlers_are_installed = false; 3088 3089// For signal-chaining 3090struct sigaction os::Bsd::sigact[MAXSIGNUM]; 3091unsigned int os::Bsd::sigs = 0; 3092bool os::Bsd::libjsig_is_loaded = false; 3093typedef struct sigaction *(*get_signal_t)(int); 3094get_signal_t os::Bsd::get_signal_action = NULL; 3095 3096struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 3097 struct sigaction *actp = NULL; 3098 3099 if (libjsig_is_loaded) { 3100 // Retrieve the old signal handler from libjsig 3101 actp = (*get_signal_action)(sig); 3102 } 3103 if (actp == NULL) { 3104 // Retrieve the preinstalled signal handler from jvm 3105 actp = get_preinstalled_handler(sig); 3106 } 3107 3108 return actp; 3109} 3110 3111static bool call_chained_handler(struct sigaction *actp, int sig, 3112 siginfo_t *siginfo, void *context) { 3113 // Call the old signal handler 3114 if (actp->sa_handler == SIG_DFL) { 3115 // It's more reasonable to let jvm treat it as an unexpected exception 3116 // instead of taking the default action. 3117 return false; 3118 } else if (actp->sa_handler != SIG_IGN) { 3119 if ((actp->sa_flags & SA_NODEFER) == 0) { 3120 // automaticlly block the signal 3121 sigaddset(&(actp->sa_mask), sig); 3122 } 3123 3124 sa_handler_t hand; 3125 sa_sigaction_t sa; 3126 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3127 // retrieve the chained handler 3128 if (siginfo_flag_set) { 3129 sa = actp->sa_sigaction; 3130 } else { 3131 hand = actp->sa_handler; 3132 } 3133 3134 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3135 actp->sa_handler = SIG_DFL; 3136 } 3137 3138 // try to honor the signal mask 3139 sigset_t oset; 3140 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3141 3142 // call into the chained handler 3143 if (siginfo_flag_set) { 3144 (*sa)(sig, siginfo, context); 3145 } else { 3146 (*hand)(sig); 3147 } 3148 3149 // restore the signal mask 3150 pthread_sigmask(SIG_SETMASK, &oset, 0); 3151 } 3152 // Tell jvm's signal handler the signal is taken care of. 3153 return true; 3154} 3155 3156bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3157 bool chained = false; 3158 // signal-chaining 3159 if (UseSignalChaining) { 3160 struct sigaction *actp = get_chained_signal_action(sig); 3161 if (actp != NULL) { 3162 chained = call_chained_handler(actp, sig, siginfo, context); 3163 } 3164 } 3165 return chained; 3166} 3167 3168struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3169 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 3170 return &sigact[sig]; 3171 } 3172 return NULL; 3173} 3174 3175void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3176 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3177 sigact[sig] = oldAct; 3178 sigs |= (unsigned int)1 << sig; 3179} 3180 3181// for diagnostic 3182int os::Bsd::sigflags[MAXSIGNUM]; 3183 3184int os::Bsd::get_our_sigflags(int sig) { 3185 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3186 return sigflags[sig]; 3187} 3188 3189void os::Bsd::set_our_sigflags(int sig, int flags) { 3190 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3191 sigflags[sig] = flags; 3192} 3193 3194void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3195 // Check for overwrite. 3196 struct sigaction oldAct; 3197 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3198 3199 void* oldhand = oldAct.sa_sigaction 3200 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3201 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3202 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3203 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3204 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3205 if (AllowUserSignalHandlers || !set_installed) { 3206 // Do not overwrite; user takes responsibility to forward to us. 3207 return; 3208 } else if (UseSignalChaining) { 3209 // save the old handler in jvm 3210 save_preinstalled_handler(sig, oldAct); 3211 // libjsig also interposes the sigaction() call below and saves the 3212 // old sigaction on it own. 3213 } else { 3214 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3215 "%#lx for signal %d.", (long)oldhand, sig)); 3216 } 3217 } 3218 3219 struct sigaction sigAct; 3220 sigfillset(&(sigAct.sa_mask)); 3221 sigAct.sa_handler = SIG_DFL; 3222 if (!set_installed) { 3223 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3224 } else { 3225 sigAct.sa_sigaction = signalHandler; 3226 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3227 } 3228#if __APPLE__ 3229 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3230 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3231 // if the signal handler declares it will handle it on alternate stack. 3232 // Notice we only declare we will handle it on alt stack, but we are not 3233 // actually going to use real alt stack - this is just a workaround. 3234 // Please see ux_exception.c, method catch_mach_exception_raise for details 3235 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3236 if (sig == SIGSEGV) { 3237 sigAct.sa_flags |= SA_ONSTACK; 3238 } 3239#endif 3240 3241 // Save flags, which are set by ours 3242 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3243 sigflags[sig] = sigAct.sa_flags; 3244 3245 int ret = sigaction(sig, &sigAct, &oldAct); 3246 assert(ret == 0, "check"); 3247 3248 void* oldhand2 = oldAct.sa_sigaction 3249 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3250 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3251 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3252} 3253 3254// install signal handlers for signals that HotSpot needs to 3255// handle in order to support Java-level exception handling. 3256 3257void os::Bsd::install_signal_handlers() { 3258 if (!signal_handlers_are_installed) { 3259 signal_handlers_are_installed = true; 3260 3261 // signal-chaining 3262 typedef void (*signal_setting_t)(); 3263 signal_setting_t begin_signal_setting = NULL; 3264 signal_setting_t end_signal_setting = NULL; 3265 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3266 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3267 if (begin_signal_setting != NULL) { 3268 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3269 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3270 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3271 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3272 libjsig_is_loaded = true; 3273 assert(UseSignalChaining, "should enable signal-chaining"); 3274 } 3275 if (libjsig_is_loaded) { 3276 // Tell libjsig jvm is setting signal handlers 3277 (*begin_signal_setting)(); 3278 } 3279 3280 set_signal_handler(SIGSEGV, true); 3281 set_signal_handler(SIGPIPE, true); 3282 set_signal_handler(SIGBUS, true); 3283 set_signal_handler(SIGILL, true); 3284 set_signal_handler(SIGFPE, true); 3285 set_signal_handler(SIGXFSZ, true); 3286 3287#if defined(__APPLE__) 3288 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3289 // signals caught and handled by the JVM. To work around this, we reset the mach task 3290 // signal handler that's placed on our process by CrashReporter. This disables 3291 // CrashReporter-based reporting. 3292 // 3293 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3294 // on caught fatal signals. 3295 // 3296 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3297 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3298 // exception handling, while leaving the standard BSD signal handlers functional. 3299 kern_return_t kr; 3300 kr = task_set_exception_ports(mach_task_self(), 3301 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3302 MACH_PORT_NULL, 3303 EXCEPTION_STATE_IDENTITY, 3304 MACHINE_THREAD_STATE); 3305 3306 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3307#endif 3308 3309 if (libjsig_is_loaded) { 3310 // Tell libjsig jvm finishes setting signal handlers 3311 (*end_signal_setting)(); 3312 } 3313 3314 // We don't activate signal checker if libjsig is in place, we trust ourselves 3315 // and if UserSignalHandler is installed all bets are off 3316 if (CheckJNICalls) { 3317 if (libjsig_is_loaded) { 3318 if (PrintJNIResolving) { 3319 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3320 } 3321 check_signals = false; 3322 } 3323 if (AllowUserSignalHandlers) { 3324 if (PrintJNIResolving) { 3325 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3326 } 3327 check_signals = false; 3328 } 3329 } 3330 } 3331} 3332 3333 3334///// 3335// glibc on Bsd platform uses non-documented flag 3336// to indicate, that some special sort of signal 3337// trampoline is used. 3338// We will never set this flag, and we should 3339// ignore this flag in our diagnostic 3340#ifdef SIGNIFICANT_SIGNAL_MASK 3341#undef SIGNIFICANT_SIGNAL_MASK 3342#endif 3343#define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3344 3345static const char* get_signal_handler_name(address handler, 3346 char* buf, int buflen) { 3347 int offset; 3348 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3349 if (found) { 3350 // skip directory names 3351 const char *p1, *p2; 3352 p1 = buf; 3353 size_t len = strlen(os::file_separator()); 3354 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3355 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3356 } else { 3357 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3358 } 3359 return buf; 3360} 3361 3362static void print_signal_handler(outputStream* st, int sig, 3363 char* buf, size_t buflen) { 3364 struct sigaction sa; 3365 3366 sigaction(sig, NULL, &sa); 3367 3368 // See comment for SIGNIFICANT_SIGNAL_MASK define 3369 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3370 3371 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3372 3373 address handler = (sa.sa_flags & SA_SIGINFO) 3374 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3375 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3376 3377 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3378 st->print("SIG_DFL"); 3379 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3380 st->print("SIG_IGN"); 3381 } else { 3382 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3383 } 3384 3385 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3386 3387 address rh = VMError::get_resetted_sighandler(sig); 3388 // May be, handler was resetted by VMError? 3389 if(rh != NULL) { 3390 handler = rh; 3391 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3392 } 3393 3394 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3395 3396 // Check: is it our handler? 3397 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3398 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3399 // It is our signal handler 3400 // check for flags, reset system-used one! 3401 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3402 st->print( 3403 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3404 os::Bsd::get_our_sigflags(sig)); 3405 } 3406 } 3407 st->cr(); 3408} 3409 3410 3411#define DO_SIGNAL_CHECK(sig) \ 3412 if (!sigismember(&check_signal_done, sig)) \ 3413 os::Bsd::check_signal_handler(sig) 3414 3415// This method is a periodic task to check for misbehaving JNI applications 3416// under CheckJNI, we can add any periodic checks here 3417 3418void os::run_periodic_checks() { 3419 3420 if (check_signals == false) return; 3421 3422 // SEGV and BUS if overridden could potentially prevent 3423 // generation of hs*.log in the event of a crash, debugging 3424 // such a case can be very challenging, so we absolutely 3425 // check the following for a good measure: 3426 DO_SIGNAL_CHECK(SIGSEGV); 3427 DO_SIGNAL_CHECK(SIGILL); 3428 DO_SIGNAL_CHECK(SIGFPE); 3429 DO_SIGNAL_CHECK(SIGBUS); 3430 DO_SIGNAL_CHECK(SIGPIPE); 3431 DO_SIGNAL_CHECK(SIGXFSZ); 3432 3433 3434 // ReduceSignalUsage allows the user to override these handlers 3435 // see comments at the very top and jvm_solaris.h 3436 if (!ReduceSignalUsage) { 3437 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3438 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3439 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3440 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3441 } 3442 3443 DO_SIGNAL_CHECK(SR_signum); 3444 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3445} 3446 3447typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3448 3449static os_sigaction_t os_sigaction = NULL; 3450 3451void os::Bsd::check_signal_handler(int sig) { 3452 char buf[O_BUFLEN]; 3453 address jvmHandler = NULL; 3454 3455 3456 struct sigaction act; 3457 if (os_sigaction == NULL) { 3458 // only trust the default sigaction, in case it has been interposed 3459 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3460 if (os_sigaction == NULL) return; 3461 } 3462 3463 os_sigaction(sig, (struct sigaction*)NULL, &act); 3464 3465 3466 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3467 3468 address thisHandler = (act.sa_flags & SA_SIGINFO) 3469 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3470 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3471 3472 3473 switch(sig) { 3474 case SIGSEGV: 3475 case SIGBUS: 3476 case SIGFPE: 3477 case SIGPIPE: 3478 case SIGILL: 3479 case SIGXFSZ: 3480 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3481 break; 3482 3483 case SHUTDOWN1_SIGNAL: 3484 case SHUTDOWN2_SIGNAL: 3485 case SHUTDOWN3_SIGNAL: 3486 case BREAK_SIGNAL: 3487 jvmHandler = (address)user_handler(); 3488 break; 3489 3490 case INTERRUPT_SIGNAL: 3491 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3492 break; 3493 3494 default: 3495 if (sig == SR_signum) { 3496 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3497 } else { 3498 return; 3499 } 3500 break; 3501 } 3502 3503 if (thisHandler != jvmHandler) { 3504 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3505 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3506 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3507 // No need to check this sig any longer 3508 sigaddset(&check_signal_done, sig); 3509 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3510 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3511 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3512 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3513 // No need to check this sig any longer 3514 sigaddset(&check_signal_done, sig); 3515 } 3516 3517 // Dump all the signal 3518 if (sigismember(&check_signal_done, sig)) { 3519 print_signal_handlers(tty, buf, O_BUFLEN); 3520 } 3521} 3522 3523extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3524 3525extern bool signal_name(int signo, char* buf, size_t len); 3526 3527const char* os::exception_name(int exception_code, char* buf, size_t size) { 3528 if (0 < exception_code && exception_code <= SIGRTMAX) { 3529 // signal 3530 if (!signal_name(exception_code, buf, size)) { 3531 jio_snprintf(buf, size, "SIG%d", exception_code); 3532 } 3533 return buf; 3534 } else { 3535 return NULL; 3536 } 3537} 3538 3539// this is called _before_ the most of global arguments have been parsed 3540void os::init(void) { 3541 char dummy; /* used to get a guess on initial stack address */ 3542// first_hrtime = gethrtime(); 3543 3544 // With BsdThreads the JavaMain thread pid (primordial thread) 3545 // is different than the pid of the java launcher thread. 3546 // So, on Bsd, the launcher thread pid is passed to the VM 3547 // via the sun.java.launcher.pid property. 3548 // Use this property instead of getpid() if it was correctly passed. 3549 // See bug 6351349. 3550 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3551 3552 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3553 3554 clock_tics_per_sec = CLK_TCK; 3555 3556 init_random(1234567); 3557 3558 ThreadCritical::initialize(); 3559 3560 Bsd::set_page_size(getpagesize()); 3561 if (Bsd::page_size() == -1) { 3562 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3563 strerror(errno))); 3564 } 3565 init_page_sizes((size_t) Bsd::page_size()); 3566 3567 Bsd::initialize_system_info(); 3568 3569 // main_thread points to the aboriginal thread 3570 Bsd::_main_thread = pthread_self(); 3571 3572 Bsd::clock_init(); 3573 initial_time_count = os::elapsed_counter(); 3574 3575#ifdef __APPLE__ 3576 // XXXDARWIN 3577 // Work around the unaligned VM callbacks in hotspot's 3578 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3579 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3580 // alignment when doing symbol lookup. To work around this, we force early 3581 // binding of all symbols now, thus binding when alignment is known-good. 3582 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3583#endif 3584} 3585 3586// To install functions for atexit system call 3587extern "C" { 3588 static void perfMemory_exit_helper() { 3589 perfMemory_exit(); 3590 } 3591} 3592 3593// this is called _after_ the global arguments have been parsed 3594jint os::init_2(void) 3595{ 3596 // Allocate a single page and mark it as readable for safepoint polling 3597 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3598 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3599 3600 os::set_polling_page( polling_page ); 3601 3602#ifndef PRODUCT 3603 if(Verbose && PrintMiscellaneous) 3604 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3605#endif 3606 3607 if (!UseMembar) { 3608 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3609 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3610 os::set_memory_serialize_page( mem_serialize_page ); 3611 3612#ifndef PRODUCT 3613 if(Verbose && PrintMiscellaneous) 3614 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3615#endif 3616 } 3617 3618 // initialize suspend/resume support - must do this before signal_sets_init() 3619 if (SR_initialize() != 0) { 3620 perror("SR_initialize failed"); 3621 return JNI_ERR; 3622 } 3623 3624 Bsd::signal_sets_init(); 3625 Bsd::install_signal_handlers(); 3626 3627 // Check minimum allowable stack size for thread creation and to initialize 3628 // the java system classes, including StackOverflowError - depends on page 3629 // size. Add a page for compiler2 recursion in main thread. 3630 // Add in 2*BytesPerWord times page size to account for VM stack during 3631 // class initialization depending on 32 or 64 bit VM. 3632 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3633 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3634 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3635 3636 size_t threadStackSizeInBytes = ThreadStackSize * K; 3637 if (threadStackSizeInBytes != 0 && 3638 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3639 tty->print_cr("\nThe stack size specified is too small, " 3640 "Specify at least %dk", 3641 os::Bsd::min_stack_allowed/ K); 3642 return JNI_ERR; 3643 } 3644 3645 // Make the stack size a multiple of the page size so that 3646 // the yellow/red zones can be guarded. 3647 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3648 vm_page_size())); 3649 3650 if (MaxFDLimit) { 3651 // set the number of file descriptors to max. print out error 3652 // if getrlimit/setrlimit fails but continue regardless. 3653 struct rlimit nbr_files; 3654 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3655 if (status != 0) { 3656 if (PrintMiscellaneous && (Verbose || WizardMode)) 3657 perror("os::init_2 getrlimit failed"); 3658 } else { 3659 nbr_files.rlim_cur = nbr_files.rlim_max; 3660 3661#ifdef __APPLE__ 3662 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3663 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3664 // be used instead 3665 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3666#endif 3667 3668 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3669 if (status != 0) { 3670 if (PrintMiscellaneous && (Verbose || WizardMode)) 3671 perror("os::init_2 setrlimit failed"); 3672 } 3673 } 3674 } 3675 3676 // at-exit methods are called in the reverse order of their registration. 3677 // atexit functions are called on return from main or as a result of a 3678 // call to exit(3C). There can be only 32 of these functions registered 3679 // and atexit() does not set errno. 3680 3681 if (PerfAllowAtExitRegistration) { 3682 // only register atexit functions if PerfAllowAtExitRegistration is set. 3683 // atexit functions can be delayed until process exit time, which 3684 // can be problematic for embedded VM situations. Embedded VMs should 3685 // call DestroyJavaVM() to assure that VM resources are released. 3686 3687 // note: perfMemory_exit_helper atexit function may be removed in 3688 // the future if the appropriate cleanup code can be added to the 3689 // VM_Exit VMOperation's doit method. 3690 if (atexit(perfMemory_exit_helper) != 0) { 3691 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3692 } 3693 } 3694 3695 // initialize thread priority policy 3696 prio_init(); 3697 3698#ifdef __APPLE__ 3699 // dynamically link to objective c gc registration 3700 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3701 if (handleLibObjc != NULL) { 3702 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3703 } 3704#endif 3705 3706 return JNI_OK; 3707} 3708 3709// this is called at the end of vm_initialization 3710void os::init_3(void) { } 3711 3712// Mark the polling page as unreadable 3713void os::make_polling_page_unreadable(void) { 3714 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3715 fatal("Could not disable polling page"); 3716}; 3717 3718// Mark the polling page as readable 3719void os::make_polling_page_readable(void) { 3720 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3721 fatal("Could not enable polling page"); 3722 } 3723}; 3724 3725int os::active_processor_count() { 3726 return _processor_count; 3727} 3728 3729void os::set_native_thread_name(const char *name) { 3730#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3731 // This is only supported in Snow Leopard and beyond 3732 if (name != NULL) { 3733 // Add a "Java: " prefix to the name 3734 char buf[MAXTHREADNAMESIZE]; 3735 snprintf(buf, sizeof(buf), "Java: %s", name); 3736 pthread_setname_np(buf); 3737 } 3738#endif 3739} 3740 3741bool os::distribute_processes(uint length, uint* distribution) { 3742 // Not yet implemented. 3743 return false; 3744} 3745 3746bool os::bind_to_processor(uint processor_id) { 3747 // Not yet implemented. 3748 return false; 3749} 3750 3751void os::SuspendedThreadTask::internal_do_task() { 3752 if (do_suspend(_thread->osthread())) { 3753 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3754 do_task(context); 3755 do_resume(_thread->osthread()); 3756 } 3757} 3758 3759/// 3760class PcFetcher : public os::SuspendedThreadTask { 3761public: 3762 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3763 ExtendedPC result(); 3764protected: 3765 void do_task(const os::SuspendedThreadTaskContext& context); 3766private: 3767 ExtendedPC _epc; 3768}; 3769 3770ExtendedPC PcFetcher::result() { 3771 guarantee(is_done(), "task is not done yet."); 3772 return _epc; 3773} 3774 3775void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3776 Thread* thread = context.thread(); 3777 OSThread* osthread = thread->osthread(); 3778 if (osthread->ucontext() != NULL) { 3779 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); 3780 } else { 3781 // NULL context is unexpected, double-check this is the VMThread 3782 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3783 } 3784} 3785 3786// Suspends the target using the signal mechanism and then grabs the PC before 3787// resuming the target. Used by the flat-profiler only 3788ExtendedPC os::get_thread_pc(Thread* thread) { 3789 // Make sure that it is called by the watcher for the VMThread 3790 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3791 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3792 3793 PcFetcher fetcher(thread); 3794 fetcher.run(); 3795 return fetcher.result(); 3796} 3797 3798int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3799{ 3800 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3801} 3802 3803//////////////////////////////////////////////////////////////////////////////// 3804// debug support 3805 3806bool os::find(address addr, outputStream* st) { 3807 Dl_info dlinfo; 3808 memset(&dlinfo, 0, sizeof(dlinfo)); 3809 if (dladdr(addr, &dlinfo) != 0) { 3810 st->print(PTR_FORMAT ": ", addr); 3811 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3812 st->print("%s+%#x", dlinfo.dli_sname, 3813 addr - (intptr_t)dlinfo.dli_saddr); 3814 } else if (dlinfo.dli_fbase != NULL) { 3815 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3816 } else { 3817 st->print("<absolute address>"); 3818 } 3819 if (dlinfo.dli_fname != NULL) { 3820 st->print(" in %s", dlinfo.dli_fname); 3821 } 3822 if (dlinfo.dli_fbase != NULL) { 3823 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3824 } 3825 st->cr(); 3826 3827 if (Verbose) { 3828 // decode some bytes around the PC 3829 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3830 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3831 address lowest = (address) dlinfo.dli_sname; 3832 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3833 if (begin < lowest) begin = lowest; 3834 Dl_info dlinfo2; 3835 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3836 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3837 end = (address) dlinfo2.dli_saddr; 3838 Disassembler::decode(begin, end, st); 3839 } 3840 return true; 3841 } 3842 return false; 3843} 3844 3845//////////////////////////////////////////////////////////////////////////////// 3846// misc 3847 3848// This does not do anything on Bsd. This is basically a hook for being 3849// able to use structured exception handling (thread-local exception filters) 3850// on, e.g., Win32. 3851void 3852os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3853 JavaCallArguments* args, Thread* thread) { 3854 f(value, method, args, thread); 3855} 3856 3857void os::print_statistics() { 3858} 3859 3860int os::message_box(const char* title, const char* message) { 3861 int i; 3862 fdStream err(defaultStream::error_fd()); 3863 for (i = 0; i < 78; i++) err.print_raw("="); 3864 err.cr(); 3865 err.print_raw_cr(title); 3866 for (i = 0; i < 78; i++) err.print_raw("-"); 3867 err.cr(); 3868 err.print_raw_cr(message); 3869 for (i = 0; i < 78; i++) err.print_raw("="); 3870 err.cr(); 3871 3872 char buf[16]; 3873 // Prevent process from exiting upon "read error" without consuming all CPU 3874 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3875 3876 return buf[0] == 'y' || buf[0] == 'Y'; 3877} 3878 3879int os::stat(const char *path, struct stat *sbuf) { 3880 char pathbuf[MAX_PATH]; 3881 if (strlen(path) > MAX_PATH - 1) { 3882 errno = ENAMETOOLONG; 3883 return -1; 3884 } 3885 os::native_path(strcpy(pathbuf, path)); 3886 return ::stat(pathbuf, sbuf); 3887} 3888 3889bool os::check_heap(bool force) { 3890 return true; 3891} 3892 3893int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3894 return ::vsnprintf(buf, count, format, args); 3895} 3896 3897// Is a (classpath) directory empty? 3898bool os::dir_is_empty(const char* path) { 3899 DIR *dir = NULL; 3900 struct dirent *ptr; 3901 3902 dir = opendir(path); 3903 if (dir == NULL) return true; 3904 3905 /* Scan the directory */ 3906 bool result = true; 3907 char buf[sizeof(struct dirent) + MAX_PATH]; 3908 while (result && (ptr = ::readdir(dir)) != NULL) { 3909 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3910 result = false; 3911 } 3912 } 3913 closedir(dir); 3914 return result; 3915} 3916 3917// This code originates from JDK's sysOpen and open64_w 3918// from src/solaris/hpi/src/system_md.c 3919 3920#ifndef O_DELETE 3921#define O_DELETE 0x10000 3922#endif 3923 3924// Open a file. Unlink the file immediately after open returns 3925// if the specified oflag has the O_DELETE flag set. 3926// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3927 3928int os::open(const char *path, int oflag, int mode) { 3929 3930 if (strlen(path) > MAX_PATH - 1) { 3931 errno = ENAMETOOLONG; 3932 return -1; 3933 } 3934 int fd; 3935 int o_delete = (oflag & O_DELETE); 3936 oflag = oflag & ~O_DELETE; 3937 3938 fd = ::open(path, oflag, mode); 3939 if (fd == -1) return -1; 3940 3941 //If the open succeeded, the file might still be a directory 3942 { 3943 struct stat buf; 3944 int ret = ::fstat(fd, &buf); 3945 int st_mode = buf.st_mode; 3946 3947 if (ret != -1) { 3948 if ((st_mode & S_IFMT) == S_IFDIR) { 3949 errno = EISDIR; 3950 ::close(fd); 3951 return -1; 3952 } 3953 } else { 3954 ::close(fd); 3955 return -1; 3956 } 3957 } 3958 3959 /* 3960 * All file descriptors that are opened in the JVM and not 3961 * specifically destined for a subprocess should have the 3962 * close-on-exec flag set. If we don't set it, then careless 3rd 3963 * party native code might fork and exec without closing all 3964 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3965 * UNIXProcess.c), and this in turn might: 3966 * 3967 * - cause end-of-file to fail to be detected on some file 3968 * descriptors, resulting in mysterious hangs, or 3969 * 3970 * - might cause an fopen in the subprocess to fail on a system 3971 * suffering from bug 1085341. 3972 * 3973 * (Yes, the default setting of the close-on-exec flag is a Unix 3974 * design flaw) 3975 * 3976 * See: 3977 * 1085341: 32-bit stdio routines should support file descriptors >255 3978 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3979 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3980 */ 3981#ifdef FD_CLOEXEC 3982 { 3983 int flags = ::fcntl(fd, F_GETFD); 3984 if (flags != -1) 3985 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3986 } 3987#endif 3988 3989 if (o_delete != 0) { 3990 ::unlink(path); 3991 } 3992 return fd; 3993} 3994 3995 3996// create binary file, rewriting existing file if required 3997int os::create_binary_file(const char* path, bool rewrite_existing) { 3998 int oflags = O_WRONLY | O_CREAT; 3999 if (!rewrite_existing) { 4000 oflags |= O_EXCL; 4001 } 4002 return ::open(path, oflags, S_IREAD | S_IWRITE); 4003} 4004 4005// return current position of file pointer 4006jlong os::current_file_offset(int fd) { 4007 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 4008} 4009 4010// move file pointer to the specified offset 4011jlong os::seek_to_file_offset(int fd, jlong offset) { 4012 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 4013} 4014 4015// This code originates from JDK's sysAvailable 4016// from src/solaris/hpi/src/native_threads/src/sys_api_td.c 4017 4018int os::available(int fd, jlong *bytes) { 4019 jlong cur, end; 4020 int mode; 4021 struct stat buf; 4022 4023 if (::fstat(fd, &buf) >= 0) { 4024 mode = buf.st_mode; 4025 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4026 /* 4027 * XXX: is the following call interruptible? If so, this might 4028 * need to go through the INTERRUPT_IO() wrapper as for other 4029 * blocking, interruptible calls in this file. 4030 */ 4031 int n; 4032 if (::ioctl(fd, FIONREAD, &n) >= 0) { 4033 *bytes = n; 4034 return 1; 4035 } 4036 } 4037 } 4038 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 4039 return 0; 4040 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 4041 return 0; 4042 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 4043 return 0; 4044 } 4045 *bytes = end - cur; 4046 return 1; 4047} 4048 4049int os::socket_available(int fd, jint *pbytes) { 4050 if (fd < 0) 4051 return OS_OK; 4052 4053 int ret; 4054 4055 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 4056 4057 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 4058 // is expected to return 0 on failure and 1 on success to the jdk. 4059 4060 return (ret == OS_ERR) ? 0 : 1; 4061} 4062 4063// Map a block of memory. 4064char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4065 char *addr, size_t bytes, bool read_only, 4066 bool allow_exec) { 4067 int prot; 4068 int flags; 4069 4070 if (read_only) { 4071 prot = PROT_READ; 4072 flags = MAP_SHARED; 4073 } else { 4074 prot = PROT_READ | PROT_WRITE; 4075 flags = MAP_PRIVATE; 4076 } 4077 4078 if (allow_exec) { 4079 prot |= PROT_EXEC; 4080 } 4081 4082 if (addr != NULL) { 4083 flags |= MAP_FIXED; 4084 } 4085 4086 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4087 fd, file_offset); 4088 if (mapped_address == MAP_FAILED) { 4089 return NULL; 4090 } 4091 return mapped_address; 4092} 4093 4094 4095// Remap a block of memory. 4096char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4097 char *addr, size_t bytes, bool read_only, 4098 bool allow_exec) { 4099 // same as map_memory() on this OS 4100 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4101 allow_exec); 4102} 4103 4104 4105// Unmap a block of memory. 4106bool os::pd_unmap_memory(char* addr, size_t bytes) { 4107 return munmap(addr, bytes) == 0; 4108} 4109 4110// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4111// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4112// of a thread. 4113// 4114// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4115// the fast estimate available on the platform. 4116 4117jlong os::current_thread_cpu_time() { 4118#ifdef __APPLE__ 4119 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 4120#else 4121 Unimplemented(); 4122 return 0; 4123#endif 4124} 4125 4126jlong os::thread_cpu_time(Thread* thread) { 4127#ifdef __APPLE__ 4128 return os::thread_cpu_time(thread, true /* user + sys */); 4129#else 4130 Unimplemented(); 4131 return 0; 4132#endif 4133} 4134 4135jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4136#ifdef __APPLE__ 4137 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4138#else 4139 Unimplemented(); 4140 return 0; 4141#endif 4142} 4143 4144jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4145#ifdef __APPLE__ 4146 struct thread_basic_info tinfo; 4147 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 4148 kern_return_t kr; 4149 thread_t mach_thread; 4150 4151 mach_thread = thread->osthread()->thread_id(); 4152 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 4153 if (kr != KERN_SUCCESS) 4154 return -1; 4155 4156 if (user_sys_cpu_time) { 4157 jlong nanos; 4158 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 4159 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 4160 return nanos; 4161 } else { 4162 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 4163 } 4164#else 4165 Unimplemented(); 4166 return 0; 4167#endif 4168} 4169 4170 4171void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4172 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4173 info_ptr->may_skip_backward = false; // elapsed time not wall time 4174 info_ptr->may_skip_forward = false; // elapsed time not wall time 4175 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4176} 4177 4178void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4179 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4180 info_ptr->may_skip_backward = false; // elapsed time not wall time 4181 info_ptr->may_skip_forward = false; // elapsed time not wall time 4182 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4183} 4184 4185bool os::is_thread_cpu_time_supported() { 4186#ifdef __APPLE__ 4187 return true; 4188#else 4189 return false; 4190#endif 4191} 4192 4193// System loadavg support. Returns -1 if load average cannot be obtained. 4194// Bsd doesn't yet have a (official) notion of processor sets, 4195// so just return the system wide load average. 4196int os::loadavg(double loadavg[], int nelem) { 4197 return ::getloadavg(loadavg, nelem); 4198} 4199 4200void os::pause() { 4201 char filename[MAX_PATH]; 4202 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4203 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4204 } else { 4205 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4206 } 4207 4208 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4209 if (fd != -1) { 4210 struct stat buf; 4211 ::close(fd); 4212 while (::stat(filename, &buf) == 0) { 4213 (void)::poll(NULL, 0, 100); 4214 } 4215 } else { 4216 jio_fprintf(stderr, 4217 "Could not open pause file '%s', continuing immediately.\n", filename); 4218 } 4219} 4220 4221 4222// Refer to the comments in os_solaris.cpp park-unpark. 4223// 4224// Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 4225// hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 4226// For specifics regarding the bug see GLIBC BUGID 261237 : 4227// http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 4228// Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 4229// will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4230// is used. (The simple C test-case provided in the GLIBC bug report manifests the 4231// hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4232// and monitorenter when we're using 1-0 locking. All those operations may result in 4233// calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4234// of libpthread avoids the problem, but isn't practical. 4235// 4236// Possible remedies: 4237// 4238// 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4239// This is palliative and probabilistic, however. If the thread is preempted 4240// between the call to compute_abstime() and pthread_cond_timedwait(), more 4241// than the minimum period may have passed, and the abstime may be stale (in the 4242// past) resultin in a hang. Using this technique reduces the odds of a hang 4243// but the JVM is still vulnerable, particularly on heavily loaded systems. 4244// 4245// 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4246// of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4247// NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4248// reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4249// thread. 4250// 4251// 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4252// that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4253// a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4254// This also works well. In fact it avoids kernel-level scalability impediments 4255// on certain platforms that don't handle lots of active pthread_cond_timedwait() 4256// timers in a graceful fashion. 4257// 4258// 4. When the abstime value is in the past it appears that control returns 4259// correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4260// Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4261// can avoid the problem by reinitializing the condvar -- by cond_destroy() 4262// followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4263// It may be possible to avoid reinitialization by checking the return 4264// value from pthread_cond_timedwait(). In addition to reinitializing the 4265// condvar we must establish the invariant that cond_signal() is only called 4266// within critical sections protected by the adjunct mutex. This prevents 4267// cond_signal() from "seeing" a condvar that's in the midst of being 4268// reinitialized or that is corrupt. Sadly, this invariant obviates the 4269// desirable signal-after-unlock optimization that avoids futile context switching. 4270// 4271// I'm also concerned that some versions of NTPL might allocate an auxilliary 4272// structure when a condvar is used or initialized. cond_destroy() would 4273// release the helper structure. Our reinitialize-after-timedwait fix 4274// put excessive stress on malloc/free and locks protecting the c-heap. 4275// 4276// We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4277// It may be possible to refine (4) by checking the kernel and NTPL verisons 4278// and only enabling the work-around for vulnerable environments. 4279 4280// utility to compute the abstime argument to timedwait: 4281// millis is the relative timeout time 4282// abstime will be the absolute timeout time 4283// TODO: replace compute_abstime() with unpackTime() 4284 4285static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4286 if (millis < 0) millis = 0; 4287 struct timeval now; 4288 int status = gettimeofday(&now, NULL); 4289 assert(status == 0, "gettimeofday"); 4290 jlong seconds = millis / 1000; 4291 millis %= 1000; 4292 if (seconds > 50000000) { // see man cond_timedwait(3T) 4293 seconds = 50000000; 4294 } 4295 abstime->tv_sec = now.tv_sec + seconds; 4296 long usec = now.tv_usec + millis * 1000; 4297 if (usec >= 1000000) { 4298 abstime->tv_sec += 1; 4299 usec -= 1000000; 4300 } 4301 abstime->tv_nsec = usec * 1000; 4302 return abstime; 4303} 4304 4305 4306// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4307// Conceptually TryPark() should be equivalent to park(0). 4308 4309int os::PlatformEvent::TryPark() { 4310 for (;;) { 4311 const int v = _Event ; 4312 guarantee ((v == 0) || (v == 1), "invariant") ; 4313 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4314 } 4315} 4316 4317void os::PlatformEvent::park() { // AKA "down()" 4318 // Invariant: Only the thread associated with the Event/PlatformEvent 4319 // may call park(). 4320 // TODO: assert that _Assoc != NULL or _Assoc == Self 4321 int v ; 4322 for (;;) { 4323 v = _Event ; 4324 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4325 } 4326 guarantee (v >= 0, "invariant") ; 4327 if (v == 0) { 4328 // Do this the hard way by blocking ... 4329 int status = pthread_mutex_lock(_mutex); 4330 assert_status(status == 0, status, "mutex_lock"); 4331 guarantee (_nParked == 0, "invariant") ; 4332 ++ _nParked ; 4333 while (_Event < 0) { 4334 status = pthread_cond_wait(_cond, _mutex); 4335 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4336 // Treat this the same as if the wait was interrupted 4337 if (status == ETIMEDOUT) { status = EINTR; } 4338 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4339 } 4340 -- _nParked ; 4341 4342 _Event = 0 ; 4343 status = pthread_mutex_unlock(_mutex); 4344 assert_status(status == 0, status, "mutex_unlock"); 4345 // Paranoia to ensure our locked and lock-free paths interact 4346 // correctly with each other. 4347 OrderAccess::fence(); 4348 } 4349 guarantee (_Event >= 0, "invariant") ; 4350} 4351 4352int os::PlatformEvent::park(jlong millis) { 4353 guarantee (_nParked == 0, "invariant") ; 4354 4355 int v ; 4356 for (;;) { 4357 v = _Event ; 4358 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4359 } 4360 guarantee (v >= 0, "invariant") ; 4361 if (v != 0) return OS_OK ; 4362 4363 // We do this the hard way, by blocking the thread. 4364 // Consider enforcing a minimum timeout value. 4365 struct timespec abst; 4366 compute_abstime(&abst, millis); 4367 4368 int ret = OS_TIMEOUT; 4369 int status = pthread_mutex_lock(_mutex); 4370 assert_status(status == 0, status, "mutex_lock"); 4371 guarantee (_nParked == 0, "invariant") ; 4372 ++_nParked ; 4373 4374 // Object.wait(timo) will return because of 4375 // (a) notification 4376 // (b) timeout 4377 // (c) thread.interrupt 4378 // 4379 // Thread.interrupt and object.notify{All} both call Event::set. 4380 // That is, we treat thread.interrupt as a special case of notification. 4381 // The underlying Solaris implementation, cond_timedwait, admits 4382 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4383 // JVM from making those visible to Java code. As such, we must 4384 // filter out spurious wakeups. We assume all ETIME returns are valid. 4385 // 4386 // TODO: properly differentiate simultaneous notify+interrupt. 4387 // In that case, we should propagate the notify to another waiter. 4388 4389 while (_Event < 0) { 4390 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4391 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4392 pthread_cond_destroy (_cond); 4393 pthread_cond_init (_cond, NULL) ; 4394 } 4395 assert_status(status == 0 || status == EINTR || 4396 status == ETIMEDOUT, 4397 status, "cond_timedwait"); 4398 if (!FilterSpuriousWakeups) break ; // previous semantics 4399 if (status == ETIMEDOUT) break ; 4400 // We consume and ignore EINTR and spurious wakeups. 4401 } 4402 --_nParked ; 4403 if (_Event >= 0) { 4404 ret = OS_OK; 4405 } 4406 _Event = 0 ; 4407 status = pthread_mutex_unlock(_mutex); 4408 assert_status(status == 0, status, "mutex_unlock"); 4409 assert (_nParked == 0, "invariant") ; 4410 // Paranoia to ensure our locked and lock-free paths interact 4411 // correctly with each other. 4412 OrderAccess::fence(); 4413 return ret; 4414} 4415 4416void os::PlatformEvent::unpark() { 4417 // Transitions for _Event: 4418 // 0 :=> 1 4419 // 1 :=> 1 4420 // -1 :=> either 0 or 1; must signal target thread 4421 // That is, we can safely transition _Event from -1 to either 4422 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4423 // unpark() calls. 4424 // See also: "Semaphores in Plan 9" by Mullender & Cox 4425 // 4426 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4427 // that it will take two back-to-back park() calls for the owning 4428 // thread to block. This has the benefit of forcing a spurious return 4429 // from the first park() call after an unpark() call which will help 4430 // shake out uses of park() and unpark() without condition variables. 4431 4432 if (Atomic::xchg(1, &_Event) >= 0) return; 4433 4434 // Wait for the thread associated with the event to vacate 4435 int status = pthread_mutex_lock(_mutex); 4436 assert_status(status == 0, status, "mutex_lock"); 4437 int AnyWaiters = _nParked; 4438 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4439 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4440 AnyWaiters = 0; 4441 pthread_cond_signal(_cond); 4442 } 4443 status = pthread_mutex_unlock(_mutex); 4444 assert_status(status == 0, status, "mutex_unlock"); 4445 if (AnyWaiters != 0) { 4446 status = pthread_cond_signal(_cond); 4447 assert_status(status == 0, status, "cond_signal"); 4448 } 4449 4450 // Note that we signal() _after dropping the lock for "immortal" Events. 4451 // This is safe and avoids a common class of futile wakeups. In rare 4452 // circumstances this can cause a thread to return prematurely from 4453 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4454 // simply re-test the condition and re-park itself. 4455} 4456 4457 4458// JSR166 4459// ------------------------------------------------------- 4460 4461/* 4462 * The solaris and bsd implementations of park/unpark are fairly 4463 * conservative for now, but can be improved. They currently use a 4464 * mutex/condvar pair, plus a a count. 4465 * Park decrements count if > 0, else does a condvar wait. Unpark 4466 * sets count to 1 and signals condvar. Only one thread ever waits 4467 * on the condvar. Contention seen when trying to park implies that someone 4468 * is unparking you, so don't wait. And spurious returns are fine, so there 4469 * is no need to track notifications. 4470 */ 4471 4472#define MAX_SECS 100000000 4473/* 4474 * This code is common to bsd and solaris and will be moved to a 4475 * common place in dolphin. 4476 * 4477 * The passed in time value is either a relative time in nanoseconds 4478 * or an absolute time in milliseconds. Either way it has to be unpacked 4479 * into suitable seconds and nanoseconds components and stored in the 4480 * given timespec structure. 4481 * Given time is a 64-bit value and the time_t used in the timespec is only 4482 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4483 * overflow if times way in the future are given. Further on Solaris versions 4484 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4485 * number of seconds, in abstime, is less than current_time + 100,000,000. 4486 * As it will be 28 years before "now + 100000000" will overflow we can 4487 * ignore overflow and just impose a hard-limit on seconds using the value 4488 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4489 * years from "now". 4490 */ 4491 4492static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4493 assert (time > 0, "convertTime"); 4494 4495 struct timeval now; 4496 int status = gettimeofday(&now, NULL); 4497 assert(status == 0, "gettimeofday"); 4498 4499 time_t max_secs = now.tv_sec + MAX_SECS; 4500 4501 if (isAbsolute) { 4502 jlong secs = time / 1000; 4503 if (secs > max_secs) { 4504 absTime->tv_sec = max_secs; 4505 } 4506 else { 4507 absTime->tv_sec = secs; 4508 } 4509 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4510 } 4511 else { 4512 jlong secs = time / NANOSECS_PER_SEC; 4513 if (secs >= MAX_SECS) { 4514 absTime->tv_sec = max_secs; 4515 absTime->tv_nsec = 0; 4516 } 4517 else { 4518 absTime->tv_sec = now.tv_sec + secs; 4519 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4520 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4521 absTime->tv_nsec -= NANOSECS_PER_SEC; 4522 ++absTime->tv_sec; // note: this must be <= max_secs 4523 } 4524 } 4525 } 4526 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4527 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4528 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4529 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4530} 4531 4532void Parker::park(bool isAbsolute, jlong time) { 4533 // Ideally we'd do something useful while spinning, such 4534 // as calling unpackTime(). 4535 4536 // Optional fast-path check: 4537 // Return immediately if a permit is available. 4538 // We depend on Atomic::xchg() having full barrier semantics 4539 // since we are doing a lock-free update to _counter. 4540 if (Atomic::xchg(0, &_counter) > 0) return; 4541 4542 Thread* thread = Thread::current(); 4543 assert(thread->is_Java_thread(), "Must be JavaThread"); 4544 JavaThread *jt = (JavaThread *)thread; 4545 4546 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4547 // Check interrupt before trying to wait 4548 if (Thread::is_interrupted(thread, false)) { 4549 return; 4550 } 4551 4552 // Next, demultiplex/decode time arguments 4553 struct timespec absTime; 4554 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4555 return; 4556 } 4557 if (time > 0) { 4558 unpackTime(&absTime, isAbsolute, time); 4559 } 4560 4561 4562 // Enter safepoint region 4563 // Beware of deadlocks such as 6317397. 4564 // The per-thread Parker:: mutex is a classic leaf-lock. 4565 // In particular a thread must never block on the Threads_lock while 4566 // holding the Parker:: mutex. If safepoints are pending both the 4567 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4568 ThreadBlockInVM tbivm(jt); 4569 4570 // Don't wait if cannot get lock since interference arises from 4571 // unblocking. Also. check interrupt before trying wait 4572 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4573 return; 4574 } 4575 4576 int status ; 4577 if (_counter > 0) { // no wait needed 4578 _counter = 0; 4579 status = pthread_mutex_unlock(_mutex); 4580 assert (status == 0, "invariant") ; 4581 // Paranoia to ensure our locked and lock-free paths interact 4582 // correctly with each other and Java-level accesses. 4583 OrderAccess::fence(); 4584 return; 4585 } 4586 4587#ifdef ASSERT 4588 // Don't catch signals while blocked; let the running threads have the signals. 4589 // (This allows a debugger to break into the running thread.) 4590 sigset_t oldsigs; 4591 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4592 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4593#endif 4594 4595 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4596 jt->set_suspend_equivalent(); 4597 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4598 4599 if (time == 0) { 4600 status = pthread_cond_wait (_cond, _mutex) ; 4601 } else { 4602 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4603 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4604 pthread_cond_destroy (_cond) ; 4605 pthread_cond_init (_cond, NULL); 4606 } 4607 } 4608 assert_status(status == 0 || status == EINTR || 4609 status == ETIMEDOUT, 4610 status, "cond_timedwait"); 4611 4612#ifdef ASSERT 4613 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4614#endif 4615 4616 _counter = 0 ; 4617 status = pthread_mutex_unlock(_mutex) ; 4618 assert_status(status == 0, status, "invariant") ; 4619 // Paranoia to ensure our locked and lock-free paths interact 4620 // correctly with each other and Java-level accesses. 4621 OrderAccess::fence(); 4622 4623 // If externally suspended while waiting, re-suspend 4624 if (jt->handle_special_suspend_equivalent_condition()) { 4625 jt->java_suspend_self(); 4626 } 4627} 4628 4629void Parker::unpark() { 4630 int s, status ; 4631 status = pthread_mutex_lock(_mutex); 4632 assert (status == 0, "invariant") ; 4633 s = _counter; 4634 _counter = 1; 4635 if (s < 1) { 4636 if (WorkAroundNPTLTimedWaitHang) { 4637 status = pthread_cond_signal (_cond) ; 4638 assert (status == 0, "invariant") ; 4639 status = pthread_mutex_unlock(_mutex); 4640 assert (status == 0, "invariant") ; 4641 } else { 4642 status = pthread_mutex_unlock(_mutex); 4643 assert (status == 0, "invariant") ; 4644 status = pthread_cond_signal (_cond) ; 4645 assert (status == 0, "invariant") ; 4646 } 4647 } else { 4648 pthread_mutex_unlock(_mutex); 4649 assert (status == 0, "invariant") ; 4650 } 4651} 4652 4653 4654/* Darwin has no "environ" in a dynamic library. */ 4655#ifdef __APPLE__ 4656#include <crt_externs.h> 4657#define environ (*_NSGetEnviron()) 4658#else 4659extern char** environ; 4660#endif 4661 4662// Run the specified command in a separate process. Return its exit value, 4663// or -1 on failure (e.g. can't fork a new process). 4664// Unlike system(), this function can be called from signal handler. It 4665// doesn't block SIGINT et al. 4666int os::fork_and_exec(char* cmd) { 4667 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4668 4669 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4670 // pthread_atfork handlers and reset pthread library. All we need is a 4671 // separate process to execve. Make a direct syscall to fork process. 4672 // On IA64 there's no fork syscall, we have to use fork() and hope for 4673 // the best... 4674 pid_t pid = fork(); 4675 4676 if (pid < 0) { 4677 // fork failed 4678 return -1; 4679 4680 } else if (pid == 0) { 4681 // child process 4682 4683 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4684 // first to kill every thread on the thread list. Because this list is 4685 // not reset by fork() (see notes above), execve() will instead kill 4686 // every thread in the parent process. We know this is the only thread 4687 // in the new process, so make a system call directly. 4688 // IA64 should use normal execve() from glibc to match the glibc fork() 4689 // above. 4690 execve("/bin/sh", (char* const*)argv, environ); 4691 4692 // execve failed 4693 _exit(-1); 4694 4695 } else { 4696 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4697 // care about the actual exit code, for now. 4698 4699 int status; 4700 4701 // Wait for the child process to exit. This returns immediately if 4702 // the child has already exited. */ 4703 while (waitpid(pid, &status, 0) < 0) { 4704 switch (errno) { 4705 case ECHILD: return 0; 4706 case EINTR: break; 4707 default: return -1; 4708 } 4709 } 4710 4711 if (WIFEXITED(status)) { 4712 // The child exited normally; get its exit code. 4713 return WEXITSTATUS(status); 4714 } else if (WIFSIGNALED(status)) { 4715 // The child exited because of a signal 4716 // The best value to return is 0x80 + signal number, 4717 // because that is what all Unix shells do, and because 4718 // it allows callers to distinguish between process exit and 4719 // process death by signal. 4720 return 0x80 + WTERMSIG(status); 4721 } else { 4722 // Unknown exit code; pass it through 4723 return status; 4724 } 4725 } 4726} 4727 4728// is_headless_jre() 4729// 4730// Test for the existence of xawt/libmawt.so or libawt_xawt.so 4731// in order to report if we are running in a headless jre 4732// 4733// Since JDK8 xawt/libmawt.so was moved into the same directory 4734// as libawt.so, and renamed libawt_xawt.so 4735// 4736bool os::is_headless_jre() { 4737 struct stat statbuf; 4738 char buf[MAXPATHLEN]; 4739 char libmawtpath[MAXPATHLEN]; 4740 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4741 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4742 char *p; 4743 4744 // Get path to libjvm.so 4745 os::jvm_path(buf, sizeof(buf)); 4746 4747 // Get rid of libjvm.so 4748 p = strrchr(buf, '/'); 4749 if (p == NULL) return false; 4750 else *p = '\0'; 4751 4752 // Get rid of client or server 4753 p = strrchr(buf, '/'); 4754 if (p == NULL) return false; 4755 else *p = '\0'; 4756 4757 // check xawt/libmawt.so 4758 strcpy(libmawtpath, buf); 4759 strcat(libmawtpath, xawtstr); 4760 if (::stat(libmawtpath, &statbuf) == 0) return false; 4761 4762 // check libawt_xawt.so 4763 strcpy(libmawtpath, buf); 4764 strcat(libmawtpath, new_xawtstr); 4765 if (::stat(libmawtpath, &statbuf) == 0) return false; 4766 4767 return true; 4768} 4769 4770// Get the default path to the core file 4771// Returns the length of the string 4772int os::get_core_path(char* buffer, size_t bufferSize) { 4773 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4774 4775 // Truncate if theoretical string was longer than bufferSize 4776 n = MIN2(n, (int)bufferSize); 4777 4778 return n; 4779} 4780 4781#ifndef PRODUCT 4782void TestReserveMemorySpecial_test() { 4783 // No tests available for this platform 4784} 4785#endif 4786