os_bsd.cpp revision 4554:f32b6c267d2e
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> 103 104#if defined(__FreeBSD__) || defined(__NetBSD__) 105# include <elf.h> 106#endif 107 108#ifdef __APPLE__ 109# include <mach/mach.h> // semaphore_* API 110# include <mach-o/dyld.h> 111# include <sys/proc_info.h> 112# include <objc/objc-auto.h> 113#endif 114 115#ifndef MAP_ANONYMOUS 116#define MAP_ANONYMOUS MAP_ANON 117#endif 118 119#define MAX_PATH (2 * K) 120 121// for timer info max values which include all bits 122#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 123 124#define LARGEPAGES_BIT (1 << 6) 125//////////////////////////////////////////////////////////////////////////////// 126// global variables 127julong os::Bsd::_physical_memory = 0; 128 129 130int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 131pthread_t os::Bsd::_main_thread; 132int os::Bsd::_page_size = -1; 133 134static jlong initial_time_count=0; 135 136static int clock_tics_per_sec = 100; 137 138// For diagnostics to print a message once. see run_periodic_checks 139static sigset_t check_signal_done; 140static bool check_signals = true; 141 142static pid_t _initial_pid = 0; 143 144/* Signal number used to suspend/resume a thread */ 145 146/* do not use any signal number less than SIGSEGV, see 4355769 */ 147static int SR_signum = SIGUSR2; 148sigset_t SR_sigset; 149 150 151//////////////////////////////////////////////////////////////////////////////// 152// utility functions 153 154static int SR_initialize(); 155 156julong os::available_memory() { 157 return Bsd::available_memory(); 158} 159 160julong os::Bsd::available_memory() { 161 // XXXBSD: this is just a stopgap implementation 162 return physical_memory() >> 2; 163} 164 165julong os::physical_memory() { 166 return Bsd::physical_memory(); 167} 168 169//////////////////////////////////////////////////////////////////////////////// 170// environment support 171 172bool os::getenv(const char* name, char* buf, int len) { 173 const char* val = ::getenv(name); 174 if (val != NULL && strlen(val) < (size_t)len) { 175 strcpy(buf, val); 176 return true; 177 } 178 if (len > 0) buf[0] = 0; // return a null string 179 return false; 180} 181 182 183// Return true if user is running as root. 184 185bool os::have_special_privileges() { 186 static bool init = false; 187 static bool privileges = false; 188 if (!init) { 189 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 190 init = true; 191 } 192 return privileges; 193} 194 195 196 197// Cpu architecture string 198#if defined(ZERO) 199static char cpu_arch[] = ZERO_LIBARCH; 200#elif defined(IA64) 201static char cpu_arch[] = "ia64"; 202#elif defined(IA32) 203static char cpu_arch[] = "i386"; 204#elif defined(AMD64) 205static char cpu_arch[] = "amd64"; 206#elif defined(ARM) 207static char cpu_arch[] = "arm"; 208#elif defined(PPC) 209static char cpu_arch[] = "ppc"; 210#elif defined(SPARC) 211# ifdef _LP64 212static char cpu_arch[] = "sparcv9"; 213# else 214static char cpu_arch[] = "sparc"; 215# endif 216#else 217#error Add appropriate cpu_arch setting 218#endif 219 220// Compiler variant 221#ifdef COMPILER2 222#define COMPILER_VARIANT "server" 223#else 224#define COMPILER_VARIANT "client" 225#endif 226 227 228void os::Bsd::initialize_system_info() { 229 int mib[2]; 230 size_t len; 231 int cpu_val; 232 julong mem_val; 233 234 /* get processors count via hw.ncpus sysctl */ 235 mib[0] = CTL_HW; 236 mib[1] = HW_NCPU; 237 len = sizeof(cpu_val); 238 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 239 assert(len == sizeof(cpu_val), "unexpected data size"); 240 set_processor_count(cpu_val); 241 } 242 else { 243 set_processor_count(1); // fallback 244 } 245 246 /* get physical memory via hw.memsize sysctl (hw.memsize is used 247 * since it returns a 64 bit value) 248 */ 249 mib[0] = CTL_HW; 250 mib[1] = HW_MEMSIZE; 251 len = sizeof(mem_val); 252 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 253 assert(len == sizeof(mem_val), "unexpected data size"); 254 _physical_memory = mem_val; 255 } else { 256 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 257 } 258 259#ifdef __OpenBSD__ 260 { 261 // limit _physical_memory memory view on OpenBSD since 262 // datasize rlimit restricts us anyway. 263 struct rlimit limits; 264 getrlimit(RLIMIT_DATA, &limits); 265 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 266 } 267#endif 268} 269 270#ifdef __APPLE__ 271static const char *get_home() { 272 const char *home_dir = ::getenv("HOME"); 273 if ((home_dir == NULL) || (*home_dir == '\0')) { 274 struct passwd *passwd_info = getpwuid(geteuid()); 275 if (passwd_info != NULL) { 276 home_dir = passwd_info->pw_dir; 277 } 278 } 279 280 return home_dir; 281} 282#endif 283 284void os::init_system_properties_values() { 285// char arch[12]; 286// sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 287 288 // The next steps are taken in the product version: 289 // 290 // Obtain the JAVA_HOME value from the location of libjvm.so. 291 // This library should be located at: 292 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 293 // 294 // If "/jre/lib/" appears at the right place in the path, then we 295 // assume libjvm.so is installed in a JDK and we use this path. 296 // 297 // Otherwise exit with message: "Could not create the Java virtual machine." 298 // 299 // The following extra steps are taken in the debugging version: 300 // 301 // If "/jre/lib/" does NOT appear at the right place in the path 302 // instead of exit check for $JAVA_HOME environment variable. 303 // 304 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 305 // then we append a fake suffix "hotspot/libjvm.so" to this path so 306 // it looks like libjvm.so is installed there 307 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 308 // 309 // Otherwise exit. 310 // 311 // Important note: if the location of libjvm.so changes this 312 // code needs to be changed accordingly. 313 314 // The next few definitions allow the code to be verbatim: 315#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 316#define getenv(n) ::getenv(n) 317 318/* 319 * See ld(1): 320 * The linker uses the following search paths to locate required 321 * shared libraries: 322 * 1: ... 323 * ... 324 * 7: The default directories, normally /lib and /usr/lib. 325 */ 326#ifndef DEFAULT_LIBPATH 327#define DEFAULT_LIBPATH "/lib:/usr/lib" 328#endif 329 330#define EXTENSIONS_DIR "/lib/ext" 331#define ENDORSED_DIR "/lib/endorsed" 332#define REG_DIR "/usr/java/packages" 333 334#ifdef __APPLE__ 335#define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 336#define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 337 const char *user_home_dir = get_home(); 338 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 339 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 340 sizeof(SYS_EXTENSIONS_DIRS); 341#endif 342 343 { 344 /* sysclasspath, java_home, dll_dir */ 345 { 346 char *home_path; 347 char *dll_path; 348 char *pslash; 349 char buf[MAXPATHLEN]; 350 os::jvm_path(buf, sizeof(buf)); 351 352 // Found the full path to libjvm.so. 353 // Now cut the path to <java_home>/jre if we can. 354 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 355 pslash = strrchr(buf, '/'); 356 if (pslash != NULL) 357 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 358 dll_path = malloc(strlen(buf) + 1); 359 if (dll_path == NULL) 360 return; 361 strcpy(dll_path, buf); 362 Arguments::set_dll_dir(dll_path); 363 364 if (pslash != NULL) { 365 pslash = strrchr(buf, '/'); 366 if (pslash != NULL) { 367 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 368#ifndef __APPLE__ 369 pslash = strrchr(buf, '/'); 370 if (pslash != NULL) 371 *pslash = '\0'; /* get rid of /lib */ 372#endif 373 } 374 } 375 376 home_path = malloc(strlen(buf) + 1); 377 if (home_path == NULL) 378 return; 379 strcpy(home_path, buf); 380 Arguments::set_java_home(home_path); 381 382 if (!set_boot_path('/', ':')) 383 return; 384 } 385 386 /* 387 * Where to look for native libraries 388 * 389 * Note: Due to a legacy implementation, most of the library path 390 * is set in the launcher. This was to accomodate linking restrictions 391 * on legacy Bsd implementations (which are no longer supported). 392 * Eventually, all the library path setting will be done here. 393 * 394 * However, to prevent the proliferation of improperly built native 395 * libraries, the new path component /usr/java/packages is added here. 396 * Eventually, all the library path setting will be done here. 397 */ 398 { 399 char *ld_library_path; 400 401 /* 402 * Construct the invariant part of ld_library_path. Note that the 403 * space for the colon and the trailing null are provided by the 404 * nulls included by the sizeof operator (so actually we allocate 405 * a byte more than necessary). 406 */ 407#ifdef __APPLE__ 408 ld_library_path = (char *) malloc(system_ext_size); 409 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 410#else 411 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 412 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 413 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 414#endif 415 416 /* 417 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 418 * should always exist (until the legacy problem cited above is 419 * addressed). 420 */ 421#ifdef __APPLE__ 422 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 423 char *l = getenv("JAVA_LIBRARY_PATH"); 424 if (l != NULL) { 425 char *t = ld_library_path; 426 /* That's +1 for the colon and +1 for the trailing '\0' */ 427 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 428 sprintf(ld_library_path, "%s:%s", l, t); 429 free(t); 430 } 431 432 char *v = getenv("DYLD_LIBRARY_PATH"); 433#else 434 char *v = getenv("LD_LIBRARY_PATH"); 435#endif 436 if (v != 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(v) + 1 + strlen(t) + 1); 440 sprintf(ld_library_path, "%s:%s", v, t); 441 free(t); 442 } 443 444#ifdef __APPLE__ 445 // Apple's Java6 has "." at the beginning of java.library.path. 446 // OpenJDK on Windows has "." at the end of java.library.path. 447 // OpenJDK on Linux and Solaris don't have "." in java.library.path 448 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 449 // "." is appended to the end of java.library.path. Yes, this 450 // could cause a change in behavior, but Apple's Java6 behavior 451 // can be achieved by putting "." at the beginning of the 452 // JAVA_LIBRARY_PATH environment variable. 453 { 454 char *t = ld_library_path; 455 // that's +3 for appending ":." and the trailing '\0' 456 ld_library_path = (char *) malloc(strlen(t) + 3); 457 sprintf(ld_library_path, "%s:%s", t, "."); 458 free(t); 459 } 460#endif 461 462 Arguments::set_library_path(ld_library_path); 463 } 464 465 /* 466 * Extensions directories. 467 * 468 * Note that the space for the colon and the trailing null are provided 469 * by the nulls included by the sizeof operator (so actually one byte more 470 * than necessary is allocated). 471 */ 472 { 473#ifdef __APPLE__ 474 char *buf = malloc(strlen(Arguments::get_java_home()) + 475 sizeof(EXTENSIONS_DIR) + system_ext_size); 476 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 477 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 478#else 479 char *buf = malloc(strlen(Arguments::get_java_home()) + 480 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 481 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 482 Arguments::get_java_home()); 483#endif 484 485 Arguments::set_ext_dirs(buf); 486 } 487 488 /* Endorsed standards default directory. */ 489 { 490 char * buf; 491 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 492 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 493 Arguments::set_endorsed_dirs(buf); 494 } 495 } 496 497#ifdef __APPLE__ 498#undef SYS_EXTENSIONS_DIR 499#endif 500#undef malloc 501#undef getenv 502#undef EXTENSIONS_DIR 503#undef ENDORSED_DIR 504 505 // Done 506 return; 507} 508 509//////////////////////////////////////////////////////////////////////////////// 510// breakpoint support 511 512void os::breakpoint() { 513 BREAKPOINT; 514} 515 516extern "C" void breakpoint() { 517 // use debugger to set breakpoint here 518} 519 520//////////////////////////////////////////////////////////////////////////////// 521// signal support 522 523debug_only(static bool signal_sets_initialized = false); 524static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 525 526bool os::Bsd::is_sig_ignored(int sig) { 527 struct sigaction oact; 528 sigaction(sig, (struct sigaction*)NULL, &oact); 529 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 530 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 531 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 532 return true; 533 else 534 return false; 535} 536 537void os::Bsd::signal_sets_init() { 538 // Should also have an assertion stating we are still single-threaded. 539 assert(!signal_sets_initialized, "Already initialized"); 540 // Fill in signals that are necessarily unblocked for all threads in 541 // the VM. Currently, we unblock the following signals: 542 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 543 // by -Xrs (=ReduceSignalUsage)); 544 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 545 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 546 // the dispositions or masks wrt these signals. 547 // Programs embedding the VM that want to use the above signals for their 548 // own purposes must, at this time, use the "-Xrs" option to prevent 549 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 550 // (See bug 4345157, and other related bugs). 551 // In reality, though, unblocking these signals is really a nop, since 552 // these signals are not blocked by default. 553 sigemptyset(&unblocked_sigs); 554 sigemptyset(&allowdebug_blocked_sigs); 555 sigaddset(&unblocked_sigs, SIGILL); 556 sigaddset(&unblocked_sigs, SIGSEGV); 557 sigaddset(&unblocked_sigs, SIGBUS); 558 sigaddset(&unblocked_sigs, SIGFPE); 559 sigaddset(&unblocked_sigs, SR_signum); 560 561 if (!ReduceSignalUsage) { 562 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 563 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 564 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 565 } 566 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 567 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 568 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 569 } 570 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 571 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 572 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 573 } 574 } 575 // Fill in signals that are blocked by all but the VM thread. 576 sigemptyset(&vm_sigs); 577 if (!ReduceSignalUsage) 578 sigaddset(&vm_sigs, BREAK_SIGNAL); 579 debug_only(signal_sets_initialized = true); 580 581} 582 583// These are signals that are unblocked while a thread is running Java. 584// (For some reason, they get blocked by default.) 585sigset_t* os::Bsd::unblocked_signals() { 586 assert(signal_sets_initialized, "Not initialized"); 587 return &unblocked_sigs; 588} 589 590// These are the signals that are blocked while a (non-VM) thread is 591// running Java. Only the VM thread handles these signals. 592sigset_t* os::Bsd::vm_signals() { 593 assert(signal_sets_initialized, "Not initialized"); 594 return &vm_sigs; 595} 596 597// These are signals that are blocked during cond_wait to allow debugger in 598sigset_t* os::Bsd::allowdebug_blocked_signals() { 599 assert(signal_sets_initialized, "Not initialized"); 600 return &allowdebug_blocked_sigs; 601} 602 603void os::Bsd::hotspot_sigmask(Thread* thread) { 604 605 //Save caller's signal mask before setting VM signal mask 606 sigset_t caller_sigmask; 607 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 608 609 OSThread* osthread = thread->osthread(); 610 osthread->set_caller_sigmask(caller_sigmask); 611 612 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 613 614 if (!ReduceSignalUsage) { 615 if (thread->is_VM_thread()) { 616 // Only the VM thread handles BREAK_SIGNAL ... 617 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 618 } else { 619 // ... all other threads block BREAK_SIGNAL 620 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 621 } 622 } 623} 624 625 626////////////////////////////////////////////////////////////////////////////// 627// create new thread 628 629static address highest_vm_reserved_address(); 630 631// check if it's safe to start a new thread 632static bool _thread_safety_check(Thread* thread) { 633 return true; 634} 635 636#ifdef __APPLE__ 637// library handle for calling objc_registerThreadWithCollector() 638// without static linking to the libobjc library 639#define OBJC_LIB "/usr/lib/libobjc.dylib" 640#define OBJC_GCREGISTER "objc_registerThreadWithCollector" 641typedef void (*objc_registerThreadWithCollector_t)(); 642extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 643objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 644#endif 645 646#ifdef __APPLE__ 647static uint64_t locate_unique_thread_id() { 648 // Additional thread_id used to correlate threads in SA 649 thread_identifier_info_data_t m_ident_info; 650 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 651 652 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, 653 (thread_info_t) &m_ident_info, &count); 654 return m_ident_info.thread_id; 655} 656#endif 657 658// Thread start routine for all newly created threads 659static void *java_start(Thread *thread) { 660 // Try to randomize the cache line index of hot stack frames. 661 // This helps when threads of the same stack traces evict each other's 662 // cache lines. The threads can be either from the same JVM instance, or 663 // from different JVM instances. The benefit is especially true for 664 // processors with hyperthreading technology. 665 static int counter = 0; 666 int pid = os::current_process_id(); 667 alloca(((pid ^ counter++) & 7) * 128); 668 669 ThreadLocalStorage::set_thread(thread); 670 671 OSThread* osthread = thread->osthread(); 672 Monitor* sync = osthread->startThread_lock(); 673 674 // non floating stack BsdThreads needs extra check, see above 675 if (!_thread_safety_check(thread)) { 676 // notify parent thread 677 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 678 osthread->set_state(ZOMBIE); 679 sync->notify_all(); 680 return NULL; 681 } 682 683#ifdef __APPLE__ 684 // thread_id is mach thread on macos 685 osthread->set_thread_id(::mach_thread_self()); 686 osthread->set_unique_thread_id(locate_unique_thread_id()); 687#else 688 // thread_id is pthread_id on BSD 689 osthread->set_thread_id(::pthread_self()); 690#endif 691 // initialize signal mask for this thread 692 os::Bsd::hotspot_sigmask(thread); 693 694 // initialize floating point control register 695 os::Bsd::init_thread_fpu_state(); 696 697#ifdef __APPLE__ 698 // register thread with objc gc 699 if (objc_registerThreadWithCollectorFunction != NULL) { 700 objc_registerThreadWithCollectorFunction(); 701 } 702#endif 703 704 // handshaking with parent thread 705 { 706 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 707 708 // notify parent thread 709 osthread->set_state(INITIALIZED); 710 sync->notify_all(); 711 712 // wait until os::start_thread() 713 while (osthread->get_state() == INITIALIZED) { 714 sync->wait(Mutex::_no_safepoint_check_flag); 715 } 716 } 717 718 // call one more level start routine 719 thread->run(); 720 721 return 0; 722} 723 724bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 725 assert(thread->osthread() == NULL, "caller responsible"); 726 727 // Allocate the OSThread object 728 OSThread* osthread = new OSThread(NULL, NULL); 729 if (osthread == NULL) { 730 return false; 731 } 732 733 // set the correct thread state 734 osthread->set_thread_type(thr_type); 735 736 // Initial state is ALLOCATED but not INITIALIZED 737 osthread->set_state(ALLOCATED); 738 739 thread->set_osthread(osthread); 740 741 // init thread attributes 742 pthread_attr_t attr; 743 pthread_attr_init(&attr); 744 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 745 746 // stack size 747 if (os::Bsd::supports_variable_stack_size()) { 748 // calculate stack size if it's not specified by caller 749 if (stack_size == 0) { 750 stack_size = os::Bsd::default_stack_size(thr_type); 751 752 switch (thr_type) { 753 case os::java_thread: 754 // Java threads use ThreadStackSize which default value can be 755 // changed with the flag -Xss 756 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 757 stack_size = JavaThread::stack_size_at_create(); 758 break; 759 case os::compiler_thread: 760 if (CompilerThreadStackSize > 0) { 761 stack_size = (size_t)(CompilerThreadStackSize * K); 762 break; 763 } // else fall through: 764 // use VMThreadStackSize if CompilerThreadStackSize is not defined 765 case os::vm_thread: 766 case os::pgc_thread: 767 case os::cgc_thread: 768 case os::watcher_thread: 769 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 770 break; 771 } 772 } 773 774 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 775 pthread_attr_setstacksize(&attr, stack_size); 776 } else { 777 // let pthread_create() pick the default value. 778 } 779 780 ThreadState state; 781 782 { 783 pthread_t tid; 784 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 785 786 pthread_attr_destroy(&attr); 787 788 if (ret != 0) { 789 if (PrintMiscellaneous && (Verbose || WizardMode)) { 790 perror("pthread_create()"); 791 } 792 // Need to clean up stuff we've allocated so far 793 thread->set_osthread(NULL); 794 delete osthread; 795 return false; 796 } 797 798 // Store pthread info into the OSThread 799 osthread->set_pthread_id(tid); 800 801 // Wait until child thread is either initialized or aborted 802 { 803 Monitor* sync_with_child = osthread->startThread_lock(); 804 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 805 while ((state = osthread->get_state()) == ALLOCATED) { 806 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 807 } 808 } 809 810 } 811 812 // Aborted due to thread limit being reached 813 if (state == ZOMBIE) { 814 thread->set_osthread(NULL); 815 delete osthread; 816 return false; 817 } 818 819 // The thread is returned suspended (in state INITIALIZED), 820 // and is started higher up in the call chain 821 assert(state == INITIALIZED, "race condition"); 822 return true; 823} 824 825///////////////////////////////////////////////////////////////////////////// 826// attach existing thread 827 828// bootstrap the main thread 829bool os::create_main_thread(JavaThread* thread) { 830 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 831 return create_attached_thread(thread); 832} 833 834bool os::create_attached_thread(JavaThread* thread) { 835#ifdef ASSERT 836 thread->verify_not_published(); 837#endif 838 839 // Allocate the OSThread object 840 OSThread* osthread = new OSThread(NULL, NULL); 841 842 if (osthread == NULL) { 843 return false; 844 } 845 846 // Store pthread info into the OSThread 847#ifdef __APPLE__ 848 osthread->set_thread_id(::mach_thread_self()); 849 osthread->set_unique_thread_id(locate_unique_thread_id()); 850#else 851 osthread->set_thread_id(::pthread_self()); 852#endif 853 osthread->set_pthread_id(::pthread_self()); 854 855 // initialize floating point control register 856 os::Bsd::init_thread_fpu_state(); 857 858 // Initial thread state is RUNNABLE 859 osthread->set_state(RUNNABLE); 860 861 thread->set_osthread(osthread); 862 863 // initialize signal mask for this thread 864 // and save the caller's signal mask 865 os::Bsd::hotspot_sigmask(thread); 866 867 return true; 868} 869 870void os::pd_start_thread(Thread* thread) { 871 OSThread * osthread = thread->osthread(); 872 assert(osthread->get_state() != INITIALIZED, "just checking"); 873 Monitor* sync_with_child = osthread->startThread_lock(); 874 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 875 sync_with_child->notify(); 876} 877 878// Free Bsd resources related to the OSThread 879void os::free_thread(OSThread* osthread) { 880 assert(osthread != NULL, "osthread not set"); 881 882 if (Thread::current()->osthread() == osthread) { 883 // Restore caller's signal mask 884 sigset_t sigmask = osthread->caller_sigmask(); 885 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 886 } 887 888 delete osthread; 889} 890 891////////////////////////////////////////////////////////////////////////////// 892// thread local storage 893 894int os::allocate_thread_local_storage() { 895 pthread_key_t key; 896 int rslt = pthread_key_create(&key, NULL); 897 assert(rslt == 0, "cannot allocate thread local storage"); 898 return (int)key; 899} 900 901// Note: This is currently not used by VM, as we don't destroy TLS key 902// on VM exit. 903void os::free_thread_local_storage(int index) { 904 int rslt = pthread_key_delete((pthread_key_t)index); 905 assert(rslt == 0, "invalid index"); 906} 907 908void os::thread_local_storage_at_put(int index, void* value) { 909 int rslt = pthread_setspecific((pthread_key_t)index, value); 910 assert(rslt == 0, "pthread_setspecific failed"); 911} 912 913extern "C" Thread* get_thread() { 914 return ThreadLocalStorage::thread(); 915} 916 917 918//////////////////////////////////////////////////////////////////////////////// 919// time support 920 921// Time since start-up in seconds to a fine granularity. 922// Used by VMSelfDestructTimer and the MemProfiler. 923double os::elapsedTime() { 924 925 return (double)(os::elapsed_counter()) * 0.000001; 926} 927 928jlong os::elapsed_counter() { 929 timeval time; 930 int status = gettimeofday(&time, NULL); 931 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 932} 933 934jlong os::elapsed_frequency() { 935 return (1000 * 1000); 936} 937 938// XXX: For now, code this as if BSD does not support vtime. 939bool os::supports_vtime() { return false; } 940bool os::enable_vtime() { return false; } 941bool os::vtime_enabled() { return false; } 942double os::elapsedVTime() { 943 // better than nothing, but not much 944 return elapsedTime(); 945} 946 947jlong os::javaTimeMillis() { 948 timeval time; 949 int status = gettimeofday(&time, NULL); 950 assert(status != -1, "bsd error"); 951 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 952} 953 954#ifndef CLOCK_MONOTONIC 955#define CLOCK_MONOTONIC (1) 956#endif 957 958#ifdef __APPLE__ 959void os::Bsd::clock_init() { 960 // XXXDARWIN: Investigate replacement monotonic clock 961} 962#else 963void os::Bsd::clock_init() { 964 struct timespec res; 965 struct timespec tp; 966 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 967 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 968 // yes, monotonic clock is supported 969 _clock_gettime = ::clock_gettime; 970 } 971} 972#endif 973 974 975jlong os::javaTimeNanos() { 976 if (Bsd::supports_monotonic_clock()) { 977 struct timespec tp; 978 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 979 assert(status == 0, "gettime error"); 980 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 981 return result; 982 } else { 983 timeval time; 984 int status = gettimeofday(&time, NULL); 985 assert(status != -1, "bsd error"); 986 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 987 return 1000 * usecs; 988 } 989} 990 991void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 992 if (Bsd::supports_monotonic_clock()) { 993 info_ptr->max_value = ALL_64_BITS; 994 995 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 996 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 997 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 998 } else { 999 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1000 info_ptr->max_value = ALL_64_BITS; 1001 1002 // gettimeofday is a real time clock so it skips 1003 info_ptr->may_skip_backward = true; 1004 info_ptr->may_skip_forward = true; 1005 } 1006 1007 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1008} 1009 1010// Return the real, user, and system times in seconds from an 1011// arbitrary fixed point in the past. 1012bool os::getTimesSecs(double* process_real_time, 1013 double* process_user_time, 1014 double* process_system_time) { 1015 struct tms ticks; 1016 clock_t real_ticks = times(&ticks); 1017 1018 if (real_ticks == (clock_t) (-1)) { 1019 return false; 1020 } else { 1021 double ticks_per_second = (double) clock_tics_per_sec; 1022 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1023 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1024 *process_real_time = ((double) real_ticks) / ticks_per_second; 1025 1026 return true; 1027 } 1028} 1029 1030 1031char * os::local_time_string(char *buf, size_t buflen) { 1032 struct tm t; 1033 time_t long_time; 1034 time(&long_time); 1035 localtime_r(&long_time, &t); 1036 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1037 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1038 t.tm_hour, t.tm_min, t.tm_sec); 1039 return buf; 1040} 1041 1042struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1043 return localtime_r(clock, res); 1044} 1045 1046//////////////////////////////////////////////////////////////////////////////// 1047// runtime exit support 1048 1049// Note: os::shutdown() might be called very early during initialization, or 1050// called from signal handler. Before adding something to os::shutdown(), make 1051// sure it is async-safe and can handle partially initialized VM. 1052void os::shutdown() { 1053 1054 // allow PerfMemory to attempt cleanup of any persistent resources 1055 perfMemory_exit(); 1056 1057 // needs to remove object in file system 1058 AttachListener::abort(); 1059 1060 // flush buffered output, finish log files 1061 ostream_abort(); 1062 1063 // Check for abort hook 1064 abort_hook_t abort_hook = Arguments::abort_hook(); 1065 if (abort_hook != NULL) { 1066 abort_hook(); 1067 } 1068 1069} 1070 1071// Note: os::abort() might be called very early during initialization, or 1072// called from signal handler. Before adding something to os::abort(), make 1073// sure it is async-safe and can handle partially initialized VM. 1074void os::abort(bool dump_core) { 1075 os::shutdown(); 1076 if (dump_core) { 1077#ifndef PRODUCT 1078 fdStream out(defaultStream::output_fd()); 1079 out.print_raw("Current thread is "); 1080 char buf[16]; 1081 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1082 out.print_raw_cr(buf); 1083 out.print_raw_cr("Dumping core ..."); 1084#endif 1085 ::abort(); // dump core 1086 } 1087 1088 ::exit(1); 1089} 1090 1091// Die immediately, no exit hook, no abort hook, no cleanup. 1092void os::die() { 1093 // _exit() on BsdThreads only kills current thread 1094 ::abort(); 1095} 1096 1097// unused on bsd for now. 1098void os::set_error_file(const char *logfile) {} 1099 1100 1101// This method is a copy of JDK's sysGetLastErrorString 1102// from src/solaris/hpi/src/system_md.c 1103 1104size_t os::lasterror(char *buf, size_t len) { 1105 1106 if (errno == 0) return 0; 1107 1108 const char *s = ::strerror(errno); 1109 size_t n = ::strlen(s); 1110 if (n >= len) { 1111 n = len - 1; 1112 } 1113 ::strncpy(buf, s, n); 1114 buf[n] = '\0'; 1115 return n; 1116} 1117 1118intx os::current_thread_id() { 1119#ifdef __APPLE__ 1120 return (intx)::mach_thread_self(); 1121#else 1122 return (intx)::pthread_self(); 1123#endif 1124} 1125int os::current_process_id() { 1126 1127 // Under the old bsd thread library, bsd gives each thread 1128 // its own process id. Because of this each thread will return 1129 // a different pid if this method were to return the result 1130 // of getpid(2). Bsd provides no api that returns the pid 1131 // of the launcher thread for the vm. This implementation 1132 // returns a unique pid, the pid of the launcher thread 1133 // that starts the vm 'process'. 1134 1135 // Under the NPTL, getpid() returns the same pid as the 1136 // launcher thread rather than a unique pid per thread. 1137 // Use gettid() if you want the old pre NPTL behaviour. 1138 1139 // if you are looking for the result of a call to getpid() that 1140 // returns a unique pid for the calling thread, then look at the 1141 // OSThread::thread_id() method in osThread_bsd.hpp file 1142 1143 return (int)(_initial_pid ? _initial_pid : getpid()); 1144} 1145 1146// DLL functions 1147 1148#define JNI_LIB_PREFIX "lib" 1149#ifdef __APPLE__ 1150#define JNI_LIB_SUFFIX ".dylib" 1151#else 1152#define JNI_LIB_SUFFIX ".so" 1153#endif 1154 1155const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1156 1157// This must be hard coded because it's the system's temporary 1158// directory not the java application's temp directory, ala java.io.tmpdir. 1159#ifdef __APPLE__ 1160// macosx has a secure per-user temporary directory 1161char temp_path_storage[PATH_MAX]; 1162const char* os::get_temp_directory() { 1163 static char *temp_path = NULL; 1164 if (temp_path == NULL) { 1165 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1166 if (pathSize == 0 || pathSize > PATH_MAX) { 1167 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1168 } 1169 temp_path = temp_path_storage; 1170 } 1171 return temp_path; 1172} 1173#else /* __APPLE__ */ 1174const char* os::get_temp_directory() { return "/tmp"; } 1175#endif /* __APPLE__ */ 1176 1177static bool file_exists(const char* filename) { 1178 struct stat statbuf; 1179 if (filename == NULL || strlen(filename) == 0) { 1180 return false; 1181 } 1182 return os::stat(filename, &statbuf) == 0; 1183} 1184 1185bool os::dll_build_name(char* buffer, size_t buflen, 1186 const char* pname, const char* fname) { 1187 bool retval = false; 1188 // Copied from libhpi 1189 const size_t pnamelen = pname ? strlen(pname) : 0; 1190 1191 // Return error on buffer overflow. 1192 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1193 return retval; 1194 } 1195 1196 if (pnamelen == 0) { 1197 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1198 retval = true; 1199 } else if (strchr(pname, *os::path_separator()) != NULL) { 1200 int n; 1201 char** pelements = split_path(pname, &n); 1202 if (pelements == NULL) { 1203 return false; 1204 } 1205 for (int i = 0 ; i < n ; i++) { 1206 // Really shouldn't be NULL, but check can't hurt 1207 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1208 continue; // skip the empty path values 1209 } 1210 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1211 pelements[i], fname); 1212 if (file_exists(buffer)) { 1213 retval = true; 1214 break; 1215 } 1216 } 1217 // release the storage 1218 for (int i = 0 ; i < n ; i++) { 1219 if (pelements[i] != NULL) { 1220 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1221 } 1222 } 1223 if (pelements != NULL) { 1224 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1225 } 1226 } else { 1227 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1228 retval = true; 1229 } 1230 return retval; 1231} 1232 1233const char* os::get_current_directory(char *buf, int buflen) { 1234 return getcwd(buf, buflen); 1235} 1236 1237// check if addr is inside libjvm.so 1238bool os::address_is_in_vm(address addr) { 1239 static address libjvm_base_addr; 1240 Dl_info dlinfo; 1241 1242 if (libjvm_base_addr == NULL) { 1243 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1244 libjvm_base_addr = (address)dlinfo.dli_fbase; 1245 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1246 } 1247 1248 if (dladdr((void *)addr, &dlinfo)) { 1249 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1250 } 1251 1252 return false; 1253} 1254 1255 1256#define MACH_MAXSYMLEN 256 1257 1258bool os::dll_address_to_function_name(address addr, char *buf, 1259 int buflen, int *offset) { 1260 Dl_info dlinfo; 1261 char localbuf[MACH_MAXSYMLEN]; 1262 1263 // dladdr will find names of dynamic functions only, but does 1264 // it set dli_fbase with mach_header address when it "fails" ? 1265 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1266 if (buf != NULL) { 1267 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1268 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1269 } 1270 } 1271 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1272 return true; 1273 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1274 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1275 buf, buflen, offset, dlinfo.dli_fname)) { 1276 return true; 1277 } 1278 } 1279 1280 // Handle non-dymanic manually: 1281 if (dlinfo.dli_fbase != NULL && 1282 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { 1283 if(!Decoder::demangle(localbuf, buf, buflen)) { 1284 jio_snprintf(buf, buflen, "%s", localbuf); 1285 } 1286 return true; 1287 } 1288 if (buf != NULL) buf[0] = '\0'; 1289 if (offset != NULL) *offset = -1; 1290 return false; 1291} 1292 1293// ported from solaris version 1294bool os::dll_address_to_library_name(address addr, char* buf, 1295 int buflen, int* offset) { 1296 Dl_info dlinfo; 1297 1298 if (dladdr((void*)addr, &dlinfo)){ 1299 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1300 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1301 return true; 1302 } else { 1303 if (buf) buf[0] = '\0'; 1304 if (offset) *offset = -1; 1305 return false; 1306 } 1307} 1308 1309// Loads .dll/.so and 1310// in case of error it checks if .dll/.so was built for the 1311// same architecture as Hotspot is running on 1312 1313#ifdef __APPLE__ 1314void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1315 void * result= ::dlopen(filename, RTLD_LAZY); 1316 if (result != NULL) { 1317 // Successful loading 1318 return result; 1319 } 1320 1321 // Read system error message into ebuf 1322 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1323 ebuf[ebuflen-1]='\0'; 1324 1325 return NULL; 1326} 1327#else 1328void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1329{ 1330 void * result= ::dlopen(filename, RTLD_LAZY); 1331 if (result != NULL) { 1332 // Successful loading 1333 return result; 1334 } 1335 1336 Elf32_Ehdr elf_head; 1337 1338 // Read system error message into ebuf 1339 // It may or may not be overwritten below 1340 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1341 ebuf[ebuflen-1]='\0'; 1342 int diag_msg_max_length=ebuflen-strlen(ebuf); 1343 char* diag_msg_buf=ebuf+strlen(ebuf); 1344 1345 if (diag_msg_max_length==0) { 1346 // No more space in ebuf for additional diagnostics message 1347 return NULL; 1348 } 1349 1350 1351 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1352 1353 if (file_descriptor < 0) { 1354 // Can't open library, report dlerror() message 1355 return NULL; 1356 } 1357 1358 bool failed_to_read_elf_head= 1359 (sizeof(elf_head)!= 1360 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1361 1362 ::close(file_descriptor); 1363 if (failed_to_read_elf_head) { 1364 // file i/o error - report dlerror() msg 1365 return NULL; 1366 } 1367 1368 typedef struct { 1369 Elf32_Half code; // Actual value as defined in elf.h 1370 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1371 char elf_class; // 32 or 64 bit 1372 char endianess; // MSB or LSB 1373 char* name; // String representation 1374 } arch_t; 1375 1376 #ifndef EM_486 1377 #define EM_486 6 /* Intel 80486 */ 1378 #endif 1379 1380 #ifndef EM_MIPS_RS3_LE 1381 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1382 #endif 1383 1384 #ifndef EM_PPC64 1385 #define EM_PPC64 21 /* PowerPC64 */ 1386 #endif 1387 1388 #ifndef EM_S390 1389 #define EM_S390 22 /* IBM System/390 */ 1390 #endif 1391 1392 #ifndef EM_IA_64 1393 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1394 #endif 1395 1396 #ifndef EM_X86_64 1397 #define EM_X86_64 62 /* AMD x86-64 */ 1398 #endif 1399 1400 static const arch_t arch_array[]={ 1401 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1402 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1403 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1404 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1405 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1406 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1407 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1408 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1409 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1410 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1411 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1412 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1413 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1414 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1415 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1416 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1417 }; 1418 1419 #if (defined IA32) 1420 static Elf32_Half running_arch_code=EM_386; 1421 #elif (defined AMD64) 1422 static Elf32_Half running_arch_code=EM_X86_64; 1423 #elif (defined IA64) 1424 static Elf32_Half running_arch_code=EM_IA_64; 1425 #elif (defined __sparc) && (defined _LP64) 1426 static Elf32_Half running_arch_code=EM_SPARCV9; 1427 #elif (defined __sparc) && (!defined _LP64) 1428 static Elf32_Half running_arch_code=EM_SPARC; 1429 #elif (defined __powerpc64__) 1430 static Elf32_Half running_arch_code=EM_PPC64; 1431 #elif (defined __powerpc__) 1432 static Elf32_Half running_arch_code=EM_PPC; 1433 #elif (defined ARM) 1434 static Elf32_Half running_arch_code=EM_ARM; 1435 #elif (defined S390) 1436 static Elf32_Half running_arch_code=EM_S390; 1437 #elif (defined ALPHA) 1438 static Elf32_Half running_arch_code=EM_ALPHA; 1439 #elif (defined MIPSEL) 1440 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1441 #elif (defined PARISC) 1442 static Elf32_Half running_arch_code=EM_PARISC; 1443 #elif (defined MIPS) 1444 static Elf32_Half running_arch_code=EM_MIPS; 1445 #elif (defined M68K) 1446 static Elf32_Half running_arch_code=EM_68K; 1447 #else 1448 #error Method os::dll_load requires that one of following is defined:\ 1449 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1450 #endif 1451 1452 // Identify compatability class for VM's architecture and library's architecture 1453 // Obtain string descriptions for architectures 1454 1455 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1456 int running_arch_index=-1; 1457 1458 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1459 if (running_arch_code == arch_array[i].code) { 1460 running_arch_index = i; 1461 } 1462 if (lib_arch.code == arch_array[i].code) { 1463 lib_arch.compat_class = arch_array[i].compat_class; 1464 lib_arch.name = arch_array[i].name; 1465 } 1466 } 1467 1468 assert(running_arch_index != -1, 1469 "Didn't find running architecture code (running_arch_code) in arch_array"); 1470 if (running_arch_index == -1) { 1471 // Even though running architecture detection failed 1472 // we may still continue with reporting dlerror() message 1473 return NULL; 1474 } 1475 1476 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1477 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1478 return NULL; 1479 } 1480 1481#ifndef S390 1482 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1483 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1484 return NULL; 1485 } 1486#endif // !S390 1487 1488 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1489 if ( lib_arch.name!=NULL ) { 1490 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1491 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1492 lib_arch.name, arch_array[running_arch_index].name); 1493 } else { 1494 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1495 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1496 lib_arch.code, 1497 arch_array[running_arch_index].name); 1498 } 1499 } 1500 1501 return NULL; 1502} 1503#endif /* !__APPLE__ */ 1504 1505// XXX: Do we need a lock around this as per Linux? 1506void* os::dll_lookup(void* handle, const char* name) { 1507 return dlsym(handle, name); 1508} 1509 1510 1511static bool _print_ascii_file(const char* filename, outputStream* st) { 1512 int fd = ::open(filename, O_RDONLY); 1513 if (fd == -1) { 1514 return false; 1515 } 1516 1517 char buf[32]; 1518 int bytes; 1519 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1520 st->print_raw(buf, bytes); 1521 } 1522 1523 ::close(fd); 1524 1525 return true; 1526} 1527 1528void os::print_dll_info(outputStream *st) { 1529 st->print_cr("Dynamic libraries:"); 1530#ifdef RTLD_DI_LINKMAP 1531 Dl_info dli; 1532 void *handle; 1533 Link_map *map; 1534 Link_map *p; 1535 1536 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1537 st->print_cr("Error: Cannot print dynamic libraries."); 1538 return; 1539 } 1540 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1541 if (handle == NULL) { 1542 st->print_cr("Error: Cannot print dynamic libraries."); 1543 return; 1544 } 1545 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1546 if (map == NULL) { 1547 st->print_cr("Error: Cannot print dynamic libraries."); 1548 return; 1549 } 1550 1551 while (map->l_prev != NULL) 1552 map = map->l_prev; 1553 1554 while (map != NULL) { 1555 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1556 map = map->l_next; 1557 } 1558 1559 dlclose(handle); 1560#elif defined(__APPLE__) 1561 uint32_t count; 1562 uint32_t i; 1563 1564 count = _dyld_image_count(); 1565 for (i = 1; i < count; i++) { 1566 const char *name = _dyld_get_image_name(i); 1567 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1568 st->print_cr(PTR_FORMAT " \t%s", slide, name); 1569 } 1570#else 1571 st->print_cr("Error: Cannot print dynamic libraries."); 1572#endif 1573} 1574 1575void os::print_os_info_brief(outputStream* st) { 1576 st->print("Bsd"); 1577 1578 os::Posix::print_uname_info(st); 1579} 1580 1581void os::print_os_info(outputStream* st) { 1582 st->print("OS:"); 1583 st->print("Bsd"); 1584 1585 os::Posix::print_uname_info(st); 1586 1587 os::Posix::print_rlimit_info(st); 1588 1589 os::Posix::print_load_average(st); 1590} 1591 1592void os::pd_print_cpu_info(outputStream* st) { 1593 // Nothing to do for now. 1594} 1595 1596void os::print_memory_info(outputStream* st) { 1597 1598 st->print("Memory:"); 1599 st->print(" %dk page", os::vm_page_size()>>10); 1600 1601 st->print(", physical " UINT64_FORMAT "k", 1602 os::physical_memory() >> 10); 1603 st->print("(" UINT64_FORMAT "k free)", 1604 os::available_memory() >> 10); 1605 st->cr(); 1606 1607 // meminfo 1608 st->print("\n/proc/meminfo:\n"); 1609 _print_ascii_file("/proc/meminfo", st); 1610 st->cr(); 1611} 1612 1613// Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1614// but they're the same for all the bsd arch that we support 1615// and they're the same for solaris but there's no common place to put this. 1616const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1617 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1618 "ILL_COPROC", "ILL_BADSTK" }; 1619 1620const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1621 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1622 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1623 1624const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1625 1626const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1627 1628void os::print_siginfo(outputStream* st, void* siginfo) { 1629 st->print("siginfo:"); 1630 1631 const int buflen = 100; 1632 char buf[buflen]; 1633 siginfo_t *si = (siginfo_t*)siginfo; 1634 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1635 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1636 st->print("si_errno=%s", buf); 1637 } else { 1638 st->print("si_errno=%d", si->si_errno); 1639 } 1640 const int c = si->si_code; 1641 assert(c > 0, "unexpected si_code"); 1642 switch (si->si_signo) { 1643 case SIGILL: 1644 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1645 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1646 break; 1647 case SIGFPE: 1648 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1649 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1650 break; 1651 case SIGSEGV: 1652 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1653 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1654 break; 1655 case SIGBUS: 1656 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1657 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1658 break; 1659 default: 1660 st->print(", si_code=%d", si->si_code); 1661 // no si_addr 1662 } 1663 1664 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1665 UseSharedSpaces) { 1666 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1667 if (mapinfo->is_in_shared_space(si->si_addr)) { 1668 st->print("\n\nError accessing class data sharing archive." \ 1669 " Mapped file inaccessible during execution, " \ 1670 " possible disk/network problem."); 1671 } 1672 } 1673 st->cr(); 1674} 1675 1676 1677static void print_signal_handler(outputStream* st, int sig, 1678 char* buf, size_t buflen); 1679 1680void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1681 st->print_cr("Signal Handlers:"); 1682 print_signal_handler(st, SIGSEGV, buf, buflen); 1683 print_signal_handler(st, SIGBUS , buf, buflen); 1684 print_signal_handler(st, SIGFPE , buf, buflen); 1685 print_signal_handler(st, SIGPIPE, buf, buflen); 1686 print_signal_handler(st, SIGXFSZ, buf, buflen); 1687 print_signal_handler(st, SIGILL , buf, buflen); 1688 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1689 print_signal_handler(st, SR_signum, buf, buflen); 1690 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1691 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1692 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1693 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1694} 1695 1696static char saved_jvm_path[MAXPATHLEN] = {0}; 1697 1698// Find the full path to the current module, libjvm 1699void os::jvm_path(char *buf, jint buflen) { 1700 // Error checking. 1701 if (buflen < MAXPATHLEN) { 1702 assert(false, "must use a large-enough buffer"); 1703 buf[0] = '\0'; 1704 return; 1705 } 1706 // Lazy resolve the path to current module. 1707 if (saved_jvm_path[0] != 0) { 1708 strcpy(buf, saved_jvm_path); 1709 return; 1710 } 1711 1712 char dli_fname[MAXPATHLEN]; 1713 bool ret = dll_address_to_library_name( 1714 CAST_FROM_FN_PTR(address, os::jvm_path), 1715 dli_fname, sizeof(dli_fname), NULL); 1716 assert(ret != 0, "cannot locate libjvm"); 1717 char *rp = realpath(dli_fname, buf); 1718 if (rp == NULL) 1719 return; 1720 1721 if (Arguments::created_by_gamma_launcher()) { 1722 // Support for the gamma launcher. Typical value for buf is 1723 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1724 // the right place in the string, then assume we are installed in a JDK and 1725 // we're done. Otherwise, check for a JAVA_HOME environment variable and 1726 // construct a path to the JVM being overridden. 1727 1728 const char *p = buf + strlen(buf) - 1; 1729 for (int count = 0; p > buf && count < 5; ++count) { 1730 for (--p; p > buf && *p != '/'; --p) 1731 /* empty */ ; 1732 } 1733 1734 if (strncmp(p, "/jre/lib/", 9) != 0) { 1735 // Look for JAVA_HOME in the environment. 1736 char* java_home_var = ::getenv("JAVA_HOME"); 1737 if (java_home_var != NULL && java_home_var[0] != 0) { 1738 char* jrelib_p; 1739 int len; 1740 1741 // Check the current module name "libjvm" 1742 p = strrchr(buf, '/'); 1743 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1744 1745 rp = realpath(java_home_var, buf); 1746 if (rp == NULL) 1747 return; 1748 1749 // determine if this is a legacy image or modules image 1750 // modules image doesn't have "jre" subdirectory 1751 len = strlen(buf); 1752 jrelib_p = buf + len; 1753 1754 // Add the appropriate library subdir 1755 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1756 if (0 != access(buf, F_OK)) { 1757 snprintf(jrelib_p, buflen-len, "/lib"); 1758 } 1759 1760 // Add the appropriate client or server subdir 1761 len = strlen(buf); 1762 jrelib_p = buf + len; 1763 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1764 if (0 != access(buf, F_OK)) { 1765 snprintf(jrelib_p, buflen-len, ""); 1766 } 1767 1768 // If the path exists within JAVA_HOME, add the JVM library name 1769 // to complete the path to JVM being overridden. Otherwise fallback 1770 // to the path to the current library. 1771 if (0 == access(buf, F_OK)) { 1772 // Use current module name "libjvm" 1773 len = strlen(buf); 1774 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1775 } else { 1776 // Fall back to path of current library 1777 rp = realpath(dli_fname, buf); 1778 if (rp == NULL) 1779 return; 1780 } 1781 } 1782 } 1783 } 1784 1785 strcpy(saved_jvm_path, buf); 1786} 1787 1788void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1789 // no prefix required, not even "_" 1790} 1791 1792void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1793 // no suffix required 1794} 1795 1796//////////////////////////////////////////////////////////////////////////////// 1797// sun.misc.Signal support 1798 1799static volatile jint sigint_count = 0; 1800 1801static void 1802UserHandler(int sig, void *siginfo, void *context) { 1803 // 4511530 - sem_post is serialized and handled by the manager thread. When 1804 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1805 // don't want to flood the manager thread with sem_post requests. 1806 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1807 return; 1808 1809 // Ctrl-C is pressed during error reporting, likely because the error 1810 // handler fails to abort. Let VM die immediately. 1811 if (sig == SIGINT && is_error_reported()) { 1812 os::die(); 1813 } 1814 1815 os::signal_notify(sig); 1816} 1817 1818void* os::user_handler() { 1819 return CAST_FROM_FN_PTR(void*, UserHandler); 1820} 1821 1822extern "C" { 1823 typedef void (*sa_handler_t)(int); 1824 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1825} 1826 1827void* os::signal(int signal_number, void* handler) { 1828 struct sigaction sigAct, oldSigAct; 1829 1830 sigfillset(&(sigAct.sa_mask)); 1831 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1832 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1833 1834 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1835 // -1 means registration failed 1836 return (void *)-1; 1837 } 1838 1839 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1840} 1841 1842void os::signal_raise(int signal_number) { 1843 ::raise(signal_number); 1844} 1845 1846/* 1847 * The following code is moved from os.cpp for making this 1848 * code platform specific, which it is by its very nature. 1849 */ 1850 1851// Will be modified when max signal is changed to be dynamic 1852int os::sigexitnum_pd() { 1853 return NSIG; 1854} 1855 1856// a counter for each possible signal value 1857static volatile jint pending_signals[NSIG+1] = { 0 }; 1858 1859// Bsd(POSIX) specific hand shaking semaphore. 1860#ifdef __APPLE__ 1861static semaphore_t sig_sem; 1862#define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1863#define SEM_WAIT(sem) semaphore_wait(sem); 1864#define SEM_POST(sem) semaphore_signal(sem); 1865#else 1866static sem_t sig_sem; 1867#define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1868#define SEM_WAIT(sem) sem_wait(&sem); 1869#define SEM_POST(sem) sem_post(&sem); 1870#endif 1871 1872void os::signal_init_pd() { 1873 // Initialize signal structures 1874 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1875 1876 // Initialize signal semaphore 1877 ::SEM_INIT(sig_sem, 0); 1878} 1879 1880void os::signal_notify(int sig) { 1881 Atomic::inc(&pending_signals[sig]); 1882 ::SEM_POST(sig_sem); 1883} 1884 1885static int check_pending_signals(bool wait) { 1886 Atomic::store(0, &sigint_count); 1887 for (;;) { 1888 for (int i = 0; i < NSIG + 1; i++) { 1889 jint n = pending_signals[i]; 1890 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1891 return i; 1892 } 1893 } 1894 if (!wait) { 1895 return -1; 1896 } 1897 JavaThread *thread = JavaThread::current(); 1898 ThreadBlockInVM tbivm(thread); 1899 1900 bool threadIsSuspended; 1901 do { 1902 thread->set_suspend_equivalent(); 1903 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1904 ::SEM_WAIT(sig_sem); 1905 1906 // were we externally suspended while we were waiting? 1907 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1908 if (threadIsSuspended) { 1909 // 1910 // The semaphore has been incremented, but while we were waiting 1911 // another thread suspended us. We don't want to continue running 1912 // while suspended because that would surprise the thread that 1913 // suspended us. 1914 // 1915 ::SEM_POST(sig_sem); 1916 1917 thread->java_suspend_self(); 1918 } 1919 } while (threadIsSuspended); 1920 } 1921} 1922 1923int os::signal_lookup() { 1924 return check_pending_signals(false); 1925} 1926 1927int os::signal_wait() { 1928 return check_pending_signals(true); 1929} 1930 1931//////////////////////////////////////////////////////////////////////////////// 1932// Virtual Memory 1933 1934int os::vm_page_size() { 1935 // Seems redundant as all get out 1936 assert(os::Bsd::page_size() != -1, "must call os::init"); 1937 return os::Bsd::page_size(); 1938} 1939 1940// Solaris allocates memory by pages. 1941int os::vm_allocation_granularity() { 1942 assert(os::Bsd::page_size() != -1, "must call os::init"); 1943 return os::Bsd::page_size(); 1944} 1945 1946// Rationale behind this function: 1947// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1948// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1949// samples for JITted code. Here we create private executable mapping over the code cache 1950// and then we can use standard (well, almost, as mapping can change) way to provide 1951// info for the reporting script by storing timestamp and location of symbol 1952void bsd_wrap_code(char* base, size_t size) { 1953 static volatile jint cnt = 0; 1954 1955 if (!UseOprofile) { 1956 return; 1957 } 1958 1959 char buf[PATH_MAX + 1]; 1960 int num = Atomic::add(1, &cnt); 1961 1962 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1963 os::get_temp_directory(), os::current_process_id(), num); 1964 unlink(buf); 1965 1966 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1967 1968 if (fd != -1) { 1969 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1970 if (rv != (off_t)-1) { 1971 if (::write(fd, "", 1) == 1) { 1972 mmap(base, size, 1973 PROT_READ|PROT_WRITE|PROT_EXEC, 1974 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1975 } 1976 } 1977 ::close(fd); 1978 unlink(buf); 1979 } 1980} 1981 1982// NOTE: Bsd kernel does not really reserve the pages for us. 1983// All it does is to check if there are enough free pages 1984// left at the time of mmap(). This could be a potential 1985// problem. 1986bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1987 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 1988#ifdef __OpenBSD__ 1989 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 1990 return ::mprotect(addr, size, prot) == 0; 1991#else 1992 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 1993 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 1994 return res != (uintptr_t) MAP_FAILED; 1995#endif 1996} 1997 1998 1999bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2000 bool exec) { 2001 return commit_memory(addr, size, exec); 2002} 2003 2004void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2005} 2006 2007void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2008 ::madvise(addr, bytes, MADV_DONTNEED); 2009} 2010 2011void os::numa_make_global(char *addr, size_t bytes) { 2012} 2013 2014void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2015} 2016 2017bool os::numa_topology_changed() { return false; } 2018 2019size_t os::numa_get_groups_num() { 2020 return 1; 2021} 2022 2023int os::numa_get_group_id() { 2024 return 0; 2025} 2026 2027size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2028 if (size > 0) { 2029 ids[0] = 0; 2030 return 1; 2031 } 2032 return 0; 2033} 2034 2035bool os::get_page_info(char *start, page_info* info) { 2036 return false; 2037} 2038 2039char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2040 return end; 2041} 2042 2043 2044bool os::pd_uncommit_memory(char* addr, size_t size) { 2045#ifdef __OpenBSD__ 2046 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2047 return ::mprotect(addr, size, PROT_NONE) == 0; 2048#else 2049 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2050 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2051 return res != (uintptr_t) MAP_FAILED; 2052#endif 2053} 2054 2055bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2056 return os::commit_memory(addr, size); 2057} 2058 2059// If this is a growable mapping, remove the guard pages entirely by 2060// munmap()ping them. If not, just call uncommit_memory(). 2061bool os::remove_stack_guard_pages(char* addr, size_t size) { 2062 return os::uncommit_memory(addr, size); 2063} 2064 2065static address _highest_vm_reserved_address = NULL; 2066 2067// If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2068// at 'requested_addr'. If there are existing memory mappings at the same 2069// location, however, they will be overwritten. If 'fixed' is false, 2070// 'requested_addr' is only treated as a hint, the return value may or 2071// may not start from the requested address. Unlike Bsd mmap(), this 2072// function returns NULL to indicate failure. 2073static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2074 char * addr; 2075 int flags; 2076 2077 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2078 if (fixed) { 2079 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2080 flags |= MAP_FIXED; 2081 } 2082 2083 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2084 // touch an uncommitted page. Otherwise, the read/write might 2085 // succeed if we have enough swap space to back the physical page. 2086 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2087 flags, -1, 0); 2088 2089 if (addr != MAP_FAILED) { 2090 // anon_mmap() should only get called during VM initialization, 2091 // don't need lock (actually we can skip locking even it can be called 2092 // from multiple threads, because _highest_vm_reserved_address is just a 2093 // hint about the upper limit of non-stack memory regions.) 2094 if ((address)addr + bytes > _highest_vm_reserved_address) { 2095 _highest_vm_reserved_address = (address)addr + bytes; 2096 } 2097 } 2098 2099 return addr == MAP_FAILED ? NULL : addr; 2100} 2101 2102// Don't update _highest_vm_reserved_address, because there might be memory 2103// regions above addr + size. If so, releasing a memory region only creates 2104// a hole in the address space, it doesn't help prevent heap-stack collision. 2105// 2106static int anon_munmap(char * addr, size_t size) { 2107 return ::munmap(addr, size) == 0; 2108} 2109 2110char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2111 size_t alignment_hint) { 2112 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2113} 2114 2115bool os::pd_release_memory(char* addr, size_t size) { 2116 return anon_munmap(addr, size); 2117} 2118 2119static address highest_vm_reserved_address() { 2120 return _highest_vm_reserved_address; 2121} 2122 2123static bool bsd_mprotect(char* addr, size_t size, int prot) { 2124 // Bsd wants the mprotect address argument to be page aligned. 2125 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2126 2127 // According to SUSv3, mprotect() should only be used with mappings 2128 // established by mmap(), and mmap() always maps whole pages. Unaligned 2129 // 'addr' likely indicates problem in the VM (e.g. trying to change 2130 // protection of malloc'ed or statically allocated memory). Check the 2131 // caller if you hit this assert. 2132 assert(addr == bottom, "sanity check"); 2133 2134 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2135 return ::mprotect(bottom, size, prot) == 0; 2136} 2137 2138// Set protections specified 2139bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2140 bool is_committed) { 2141 unsigned int p = 0; 2142 switch (prot) { 2143 case MEM_PROT_NONE: p = PROT_NONE; break; 2144 case MEM_PROT_READ: p = PROT_READ; break; 2145 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2146 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2147 default: 2148 ShouldNotReachHere(); 2149 } 2150 // is_committed is unused. 2151 return bsd_mprotect(addr, bytes, p); 2152} 2153 2154bool os::guard_memory(char* addr, size_t size) { 2155 return bsd_mprotect(addr, size, PROT_NONE); 2156} 2157 2158bool os::unguard_memory(char* addr, size_t size) { 2159 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2160} 2161 2162bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2163 return false; 2164} 2165 2166/* 2167* Set the coredump_filter bits to include largepages in core dump (bit 6) 2168* 2169* From the coredump_filter documentation: 2170* 2171* - (bit 0) anonymous private memory 2172* - (bit 1) anonymous shared memory 2173* - (bit 2) file-backed private memory 2174* - (bit 3) file-backed shared memory 2175* - (bit 4) ELF header pages in file-backed private memory areas (it is 2176* effective only if the bit 2 is cleared) 2177* - (bit 5) hugetlb private memory 2178* - (bit 6) hugetlb shared memory 2179*/ 2180static void set_coredump_filter(void) { 2181 FILE *f; 2182 long cdm; 2183 2184 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 2185 return; 2186 } 2187 2188 if (fscanf(f, "%lx", &cdm) != 1) { 2189 fclose(f); 2190 return; 2191 } 2192 2193 rewind(f); 2194 2195 if ((cdm & LARGEPAGES_BIT) == 0) { 2196 cdm |= LARGEPAGES_BIT; 2197 fprintf(f, "%#lx", cdm); 2198 } 2199 2200 fclose(f); 2201} 2202 2203// Large page support 2204 2205static size_t _large_page_size = 0; 2206 2207void os::large_page_init() { 2208} 2209 2210 2211char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 2212 // "exec" is passed in but not used. Creating the shared image for 2213 // the code cache doesn't have an SHM_X executable permission to check. 2214 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2215 2216 key_t key = IPC_PRIVATE; 2217 char *addr; 2218 2219 bool warn_on_failure = UseLargePages && 2220 (!FLAG_IS_DEFAULT(UseLargePages) || 2221 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2222 ); 2223 char msg[128]; 2224 2225 // Create a large shared memory region to attach to based on size. 2226 // Currently, size is the total size of the heap 2227 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2228 if (shmid == -1) { 2229 // Possible reasons for shmget failure: 2230 // 1. shmmax is too small for Java heap. 2231 // > check shmmax value: cat /proc/sys/kernel/shmmax 2232 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2233 // 2. not enough large page memory. 2234 // > check available large pages: cat /proc/meminfo 2235 // > increase amount of large pages: 2236 // echo new_value > /proc/sys/vm/nr_hugepages 2237 // Note 1: different Bsd may use different name for this property, 2238 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2239 // Note 2: it's possible there's enough physical memory available but 2240 // they are so fragmented after a long run that they can't 2241 // coalesce into large pages. Try to reserve large pages when 2242 // the system is still "fresh". 2243 if (warn_on_failure) { 2244 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2245 warning(msg); 2246 } 2247 return NULL; 2248 } 2249 2250 // attach to the region 2251 addr = (char*)shmat(shmid, req_addr, 0); 2252 int err = errno; 2253 2254 // Remove shmid. If shmat() is successful, the actual shared memory segment 2255 // will be deleted when it's detached by shmdt() or when the process 2256 // terminates. If shmat() is not successful this will remove the shared 2257 // segment immediately. 2258 shmctl(shmid, IPC_RMID, NULL); 2259 2260 if ((intptr_t)addr == -1) { 2261 if (warn_on_failure) { 2262 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2263 warning(msg); 2264 } 2265 return NULL; 2266 } 2267 2268 // The memory is committed 2269 address pc = CALLER_PC; 2270 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); 2271 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); 2272 2273 return addr; 2274} 2275 2276bool os::release_memory_special(char* base, size_t bytes) { 2277 // detaching the SHM segment will also delete it, see reserve_memory_special() 2278 int rslt = shmdt(base); 2279 if (rslt == 0) { 2280 MemTracker::record_virtual_memory_uncommit((address)base, bytes); 2281 MemTracker::record_virtual_memory_release((address)base, bytes); 2282 return true; 2283 } else { 2284 return false; 2285 } 2286 2287} 2288 2289size_t os::large_page_size() { 2290 return _large_page_size; 2291} 2292 2293// HugeTLBFS allows application to commit large page memory on demand; 2294// with SysV SHM the entire memory region must be allocated as shared 2295// memory. 2296bool os::can_commit_large_page_memory() { 2297 return UseHugeTLBFS; 2298} 2299 2300bool os::can_execute_large_page_memory() { 2301 return UseHugeTLBFS; 2302} 2303 2304// Reserve memory at an arbitrary address, only if that area is 2305// available (and not reserved for something else). 2306 2307char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2308 const int max_tries = 10; 2309 char* base[max_tries]; 2310 size_t size[max_tries]; 2311 const size_t gap = 0x000000; 2312 2313 // Assert only that the size is a multiple of the page size, since 2314 // that's all that mmap requires, and since that's all we really know 2315 // about at this low abstraction level. If we need higher alignment, 2316 // we can either pass an alignment to this method or verify alignment 2317 // in one of the methods further up the call chain. See bug 5044738. 2318 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2319 2320 // Repeatedly allocate blocks until the block is allocated at the 2321 // right spot. Give up after max_tries. Note that reserve_memory() will 2322 // automatically update _highest_vm_reserved_address if the call is 2323 // successful. The variable tracks the highest memory address every reserved 2324 // by JVM. It is used to detect heap-stack collision if running with 2325 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2326 // space than needed, it could confuse the collision detecting code. To 2327 // solve the problem, save current _highest_vm_reserved_address and 2328 // calculate the correct value before return. 2329 address old_highest = _highest_vm_reserved_address; 2330 2331 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2332 // if kernel honors the hint then we can return immediately. 2333 char * addr = anon_mmap(requested_addr, bytes, false); 2334 if (addr == requested_addr) { 2335 return requested_addr; 2336 } 2337 2338 if (addr != NULL) { 2339 // mmap() is successful but it fails to reserve at the requested address 2340 anon_munmap(addr, bytes); 2341 } 2342 2343 int i; 2344 for (i = 0; i < max_tries; ++i) { 2345 base[i] = reserve_memory(bytes); 2346 2347 if (base[i] != NULL) { 2348 // Is this the block we wanted? 2349 if (base[i] == requested_addr) { 2350 size[i] = bytes; 2351 break; 2352 } 2353 2354 // Does this overlap the block we wanted? Give back the overlapped 2355 // parts and try again. 2356 2357 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2358 if (top_overlap >= 0 && top_overlap < bytes) { 2359 unmap_memory(base[i], top_overlap); 2360 base[i] += top_overlap; 2361 size[i] = bytes - top_overlap; 2362 } else { 2363 size_t bottom_overlap = base[i] + bytes - requested_addr; 2364 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2365 unmap_memory(requested_addr, bottom_overlap); 2366 size[i] = bytes - bottom_overlap; 2367 } else { 2368 size[i] = bytes; 2369 } 2370 } 2371 } 2372 } 2373 2374 // Give back the unused reserved pieces. 2375 2376 for (int j = 0; j < i; ++j) { 2377 if (base[j] != NULL) { 2378 unmap_memory(base[j], size[j]); 2379 } 2380 } 2381 2382 if (i < max_tries) { 2383 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2384 return requested_addr; 2385 } else { 2386 _highest_vm_reserved_address = old_highest; 2387 return NULL; 2388 } 2389} 2390 2391size_t os::read(int fd, void *buf, unsigned int nBytes) { 2392 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2393} 2394 2395// TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2396// Solaris uses poll(), bsd uses park(). 2397// Poll() is likely a better choice, assuming that Thread.interrupt() 2398// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2399// SIGSEGV, see 4355769. 2400 2401int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2402 assert(thread == Thread::current(), "thread consistency check"); 2403 2404 ParkEvent * const slp = thread->_SleepEvent ; 2405 slp->reset() ; 2406 OrderAccess::fence() ; 2407 2408 if (interruptible) { 2409 jlong prevtime = javaTimeNanos(); 2410 2411 for (;;) { 2412 if (os::is_interrupted(thread, true)) { 2413 return OS_INTRPT; 2414 } 2415 2416 jlong newtime = javaTimeNanos(); 2417 2418 if (newtime - prevtime < 0) { 2419 // time moving backwards, should only happen if no monotonic clock 2420 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2421 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2422 } else { 2423 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2424 } 2425 2426 if(millis <= 0) { 2427 return OS_OK; 2428 } 2429 2430 prevtime = newtime; 2431 2432 { 2433 assert(thread->is_Java_thread(), "sanity check"); 2434 JavaThread *jt = (JavaThread *) thread; 2435 ThreadBlockInVM tbivm(jt); 2436 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2437 2438 jt->set_suspend_equivalent(); 2439 // cleared by handle_special_suspend_equivalent_condition() or 2440 // java_suspend_self() via check_and_wait_while_suspended() 2441 2442 slp->park(millis); 2443 2444 // were we externally suspended while we were waiting? 2445 jt->check_and_wait_while_suspended(); 2446 } 2447 } 2448 } else { 2449 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2450 jlong prevtime = javaTimeNanos(); 2451 2452 for (;;) { 2453 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2454 // the 1st iteration ... 2455 jlong newtime = javaTimeNanos(); 2456 2457 if (newtime - prevtime < 0) { 2458 // time moving backwards, should only happen if no monotonic clock 2459 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2460 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2461 } else { 2462 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2463 } 2464 2465 if(millis <= 0) break ; 2466 2467 prevtime = newtime; 2468 slp->park(millis); 2469 } 2470 return OS_OK ; 2471 } 2472} 2473 2474int os::naked_sleep() { 2475 // %% make the sleep time an integer flag. for now use 1 millisec. 2476 return os::sleep(Thread::current(), 1, false); 2477} 2478 2479// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2480void os::infinite_sleep() { 2481 while (true) { // sleep forever ... 2482 ::sleep(100); // ... 100 seconds at a time 2483 } 2484} 2485 2486// Used to convert frequent JVM_Yield() to nops 2487bool os::dont_yield() { 2488 return DontYieldALot; 2489} 2490 2491void os::yield() { 2492 sched_yield(); 2493} 2494 2495os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2496 2497void os::yield_all(int attempts) { 2498 // Yields to all threads, including threads with lower priorities 2499 // Threads on Bsd are all with same priority. The Solaris style 2500 // os::yield_all() with nanosleep(1ms) is not necessary. 2501 sched_yield(); 2502} 2503 2504// Called from the tight loops to possibly influence time-sharing heuristics 2505void os::loop_breaker(int attempts) { 2506 os::yield_all(attempts); 2507} 2508 2509//////////////////////////////////////////////////////////////////////////////// 2510// thread priority support 2511 2512// Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2513// only supports dynamic priority, static priority must be zero. For real-time 2514// applications, Bsd supports SCHED_RR which allows static priority (1-99). 2515// However, for large multi-threaded applications, SCHED_RR is not only slower 2516// than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2517// of 5 runs - Sep 2005). 2518// 2519// The following code actually changes the niceness of kernel-thread/LWP. It 2520// has an assumption that setpriority() only modifies one kernel-thread/LWP, 2521// not the entire user process, and user level threads are 1:1 mapped to kernel 2522// threads. It has always been the case, but could change in the future. For 2523// this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2524// It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2525 2526#if !defined(__APPLE__) 2527int os::java_to_os_priority[CriticalPriority + 1] = { 2528 19, // 0 Entry should never be used 2529 2530 0, // 1 MinPriority 2531 3, // 2 2532 6, // 3 2533 2534 10, // 4 2535 15, // 5 NormPriority 2536 18, // 6 2537 2538 21, // 7 2539 25, // 8 2540 28, // 9 NearMaxPriority 2541 2542 31, // 10 MaxPriority 2543 2544 31 // 11 CriticalPriority 2545}; 2546#else 2547/* Using Mach high-level priority assignments */ 2548int os::java_to_os_priority[CriticalPriority + 1] = { 2549 0, // 0 Entry should never be used (MINPRI_USER) 2550 2551 27, // 1 MinPriority 2552 28, // 2 2553 29, // 3 2554 2555 30, // 4 2556 31, // 5 NormPriority (BASEPRI_DEFAULT) 2557 32, // 6 2558 2559 33, // 7 2560 34, // 8 2561 35, // 9 NearMaxPriority 2562 2563 36, // 10 MaxPriority 2564 2565 36 // 11 CriticalPriority 2566}; 2567#endif 2568 2569static int prio_init() { 2570 if (ThreadPriorityPolicy == 1) { 2571 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2572 // if effective uid is not root. Perhaps, a more elegant way of doing 2573 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2574 if (geteuid() != 0) { 2575 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2576 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2577 } 2578 ThreadPriorityPolicy = 0; 2579 } 2580 } 2581 if (UseCriticalJavaThreadPriority) { 2582 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2583 } 2584 return 0; 2585} 2586 2587OSReturn os::set_native_priority(Thread* thread, int newpri) { 2588 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2589 2590#ifdef __OpenBSD__ 2591 // OpenBSD pthread_setprio starves low priority threads 2592 return OS_OK; 2593#elif defined(__FreeBSD__) 2594 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2595#elif defined(__APPLE__) || defined(__NetBSD__) 2596 struct sched_param sp; 2597 int policy; 2598 pthread_t self = pthread_self(); 2599 2600 if (pthread_getschedparam(self, &policy, &sp) != 0) 2601 return OS_ERR; 2602 2603 sp.sched_priority = newpri; 2604 if (pthread_setschedparam(self, policy, &sp) != 0) 2605 return OS_ERR; 2606 2607 return OS_OK; 2608#else 2609 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2610 return (ret == 0) ? OS_OK : OS_ERR; 2611#endif 2612} 2613 2614OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2615 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2616 *priority_ptr = java_to_os_priority[NormPriority]; 2617 return OS_OK; 2618 } 2619 2620 errno = 0; 2621#if defined(__OpenBSD__) || defined(__FreeBSD__) 2622 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2623#elif defined(__APPLE__) || defined(__NetBSD__) 2624 int policy; 2625 struct sched_param sp; 2626 2627 pthread_getschedparam(pthread_self(), &policy, &sp); 2628 *priority_ptr = sp.sched_priority; 2629#else 2630 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2631#endif 2632 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2633} 2634 2635// Hint to the underlying OS that a task switch would not be good. 2636// Void return because it's a hint and can fail. 2637void os::hint_no_preempt() {} 2638 2639//////////////////////////////////////////////////////////////////////////////// 2640// suspend/resume support 2641 2642// the low-level signal-based suspend/resume support is a remnant from the 2643// old VM-suspension that used to be for java-suspension, safepoints etc, 2644// within hotspot. Now there is a single use-case for this: 2645// - calling get_thread_pc() on the VMThread by the flat-profiler task 2646// that runs in the watcher thread. 2647// The remaining code is greatly simplified from the more general suspension 2648// code that used to be used. 2649// 2650// The protocol is quite simple: 2651// - suspend: 2652// - sends a signal to the target thread 2653// - polls the suspend state of the osthread using a yield loop 2654// - target thread signal handler (SR_handler) sets suspend state 2655// and blocks in sigsuspend until continued 2656// - resume: 2657// - sets target osthread state to continue 2658// - sends signal to end the sigsuspend loop in the SR_handler 2659// 2660// Note that the SR_lock plays no role in this suspend/resume protocol. 2661// 2662 2663static void resume_clear_context(OSThread *osthread) { 2664 osthread->set_ucontext(NULL); 2665 osthread->set_siginfo(NULL); 2666 2667 // notify the suspend action is completed, we have now resumed 2668 osthread->sr.clear_suspended(); 2669} 2670 2671static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2672 osthread->set_ucontext(context); 2673 osthread->set_siginfo(siginfo); 2674} 2675 2676// 2677// Handler function invoked when a thread's execution is suspended or 2678// resumed. We have to be careful that only async-safe functions are 2679// called here (Note: most pthread functions are not async safe and 2680// should be avoided.) 2681// 2682// Note: sigwait() is a more natural fit than sigsuspend() from an 2683// interface point of view, but sigwait() prevents the signal hander 2684// from being run. libpthread would get very confused by not having 2685// its signal handlers run and prevents sigwait()'s use with the 2686// mutex granting granting signal. 2687// 2688// Currently only ever called on the VMThread 2689// 2690static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2691 // Save and restore errno to avoid confusing native code with EINTR 2692 // after sigsuspend. 2693 int old_errno = errno; 2694 2695 Thread* thread = Thread::current(); 2696 OSThread* osthread = thread->osthread(); 2697 assert(thread->is_VM_thread(), "Must be VMThread"); 2698 // read current suspend action 2699 int action = osthread->sr.suspend_action(); 2700 if (action == os::Bsd::SuspendResume::SR_SUSPEND) { 2701 suspend_save_context(osthread, siginfo, context); 2702 2703 // Notify the suspend action is about to be completed. do_suspend() 2704 // waits until SR_SUSPENDED is set and then returns. We will wait 2705 // here for a resume signal and that completes the suspend-other 2706 // action. do_suspend/do_resume is always called as a pair from 2707 // the same thread - so there are no races 2708 2709 // notify the caller 2710 osthread->sr.set_suspended(); 2711 2712 sigset_t suspend_set; // signals for sigsuspend() 2713 2714 // get current set of blocked signals and unblock resume signal 2715 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2716 sigdelset(&suspend_set, SR_signum); 2717 2718 // wait here until we are resumed 2719 do { 2720 sigsuspend(&suspend_set); 2721 // ignore all returns until we get a resume signal 2722 } while (osthread->sr.suspend_action() != os::Bsd::SuspendResume::SR_CONTINUE); 2723 2724 resume_clear_context(osthread); 2725 2726 } else { 2727 assert(action == os::Bsd::SuspendResume::SR_CONTINUE, "unexpected sr action"); 2728 // nothing special to do - just leave the handler 2729 } 2730 2731 errno = old_errno; 2732} 2733 2734 2735static int SR_initialize() { 2736 struct sigaction act; 2737 char *s; 2738 /* Get signal number to use for suspend/resume */ 2739 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2740 int sig = ::strtol(s, 0, 10); 2741 if (sig > 0 || sig < NSIG) { 2742 SR_signum = sig; 2743 } 2744 } 2745 2746 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2747 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2748 2749 sigemptyset(&SR_sigset); 2750 sigaddset(&SR_sigset, SR_signum); 2751 2752 /* Set up signal handler for suspend/resume */ 2753 act.sa_flags = SA_RESTART|SA_SIGINFO; 2754 act.sa_handler = (void (*)(int)) SR_handler; 2755 2756 // SR_signum is blocked by default. 2757 // 4528190 - We also need to block pthread restart signal (32 on all 2758 // supported Bsd platforms). Note that BsdThreads need to block 2759 // this signal for all threads to work properly. So we don't have 2760 // to use hard-coded signal number when setting up the mask. 2761 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2762 2763 if (sigaction(SR_signum, &act, 0) == -1) { 2764 return -1; 2765 } 2766 2767 // Save signal flag 2768 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2769 return 0; 2770} 2771 2772 2773// returns true on success and false on error - really an error is fatal 2774// but this seems the normal response to library errors 2775static bool do_suspend(OSThread* osthread) { 2776 // mark as suspended and send signal 2777 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_SUSPEND); 2778 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2779 assert_status(status == 0, status, "pthread_kill"); 2780 2781 // check status and wait until notified of suspension 2782 if (status == 0) { 2783 for (int i = 0; !osthread->sr.is_suspended(); i++) { 2784 os::yield_all(i); 2785 } 2786 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); 2787 return true; 2788 } 2789 else { 2790 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); 2791 return false; 2792 } 2793} 2794 2795static void do_resume(OSThread* osthread) { 2796 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2797 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_CONTINUE); 2798 2799 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2800 assert_status(status == 0, status, "pthread_kill"); 2801 // check status and wait unit notified of resumption 2802 if (status == 0) { 2803 for (int i = 0; osthread->sr.is_suspended(); i++) { 2804 os::yield_all(i); 2805 } 2806 } 2807 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); 2808} 2809 2810//////////////////////////////////////////////////////////////////////////////// 2811// interrupt support 2812 2813void os::interrupt(Thread* thread) { 2814 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2815 "possibility of dangling Thread pointer"); 2816 2817 OSThread* osthread = thread->osthread(); 2818 2819 if (!osthread->interrupted()) { 2820 osthread->set_interrupted(true); 2821 // More than one thread can get here with the same value of osthread, 2822 // resulting in multiple notifications. We do, however, want the store 2823 // to interrupted() to be visible to other threads before we execute unpark(). 2824 OrderAccess::fence(); 2825 ParkEvent * const slp = thread->_SleepEvent ; 2826 if (slp != NULL) slp->unpark() ; 2827 } 2828 2829 // For JSR166. Unpark even if interrupt status already was set 2830 if (thread->is_Java_thread()) 2831 ((JavaThread*)thread)->parker()->unpark(); 2832 2833 ParkEvent * ev = thread->_ParkEvent ; 2834 if (ev != NULL) ev->unpark() ; 2835 2836} 2837 2838bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2839 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2840 "possibility of dangling Thread pointer"); 2841 2842 OSThread* osthread = thread->osthread(); 2843 2844 bool interrupted = osthread->interrupted(); 2845 2846 if (interrupted && clear_interrupted) { 2847 osthread->set_interrupted(false); 2848 // consider thread->_SleepEvent->reset() ... optional optimization 2849 } 2850 2851 return interrupted; 2852} 2853 2854/////////////////////////////////////////////////////////////////////////////////// 2855// signal handling (except suspend/resume) 2856 2857// This routine may be used by user applications as a "hook" to catch signals. 2858// The user-defined signal handler must pass unrecognized signals to this 2859// routine, and if it returns true (non-zero), then the signal handler must 2860// return immediately. If the flag "abort_if_unrecognized" is true, then this 2861// routine will never retun false (zero), but instead will execute a VM panic 2862// routine kill the process. 2863// 2864// If this routine returns false, it is OK to call it again. This allows 2865// the user-defined signal handler to perform checks either before or after 2866// the VM performs its own checks. Naturally, the user code would be making 2867// a serious error if it tried to handle an exception (such as a null check 2868// or breakpoint) that the VM was generating for its own correct operation. 2869// 2870// This routine may recognize any of the following kinds of signals: 2871// SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2872// It should be consulted by handlers for any of those signals. 2873// 2874// The caller of this routine must pass in the three arguments supplied 2875// to the function referred to in the "sa_sigaction" (not the "sa_handler") 2876// field of the structure passed to sigaction(). This routine assumes that 2877// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2878// 2879// Note that the VM will print warnings if it detects conflicting signal 2880// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2881// 2882extern "C" JNIEXPORT int 2883JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2884 void* ucontext, int abort_if_unrecognized); 2885 2886void signalHandler(int sig, siginfo_t* info, void* uc) { 2887 assert(info != NULL && uc != NULL, "it must be old kernel"); 2888 int orig_errno = errno; // Preserve errno value over signal handler. 2889 JVM_handle_bsd_signal(sig, info, uc, true); 2890 errno = orig_errno; 2891} 2892 2893 2894// This boolean allows users to forward their own non-matching signals 2895// to JVM_handle_bsd_signal, harmlessly. 2896bool os::Bsd::signal_handlers_are_installed = false; 2897 2898// For signal-chaining 2899struct sigaction os::Bsd::sigact[MAXSIGNUM]; 2900unsigned int os::Bsd::sigs = 0; 2901bool os::Bsd::libjsig_is_loaded = false; 2902typedef struct sigaction *(*get_signal_t)(int); 2903get_signal_t os::Bsd::get_signal_action = NULL; 2904 2905struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2906 struct sigaction *actp = NULL; 2907 2908 if (libjsig_is_loaded) { 2909 // Retrieve the old signal handler from libjsig 2910 actp = (*get_signal_action)(sig); 2911 } 2912 if (actp == NULL) { 2913 // Retrieve the preinstalled signal handler from jvm 2914 actp = get_preinstalled_handler(sig); 2915 } 2916 2917 return actp; 2918} 2919 2920static bool call_chained_handler(struct sigaction *actp, int sig, 2921 siginfo_t *siginfo, void *context) { 2922 // Call the old signal handler 2923 if (actp->sa_handler == SIG_DFL) { 2924 // It's more reasonable to let jvm treat it as an unexpected exception 2925 // instead of taking the default action. 2926 return false; 2927 } else if (actp->sa_handler != SIG_IGN) { 2928 if ((actp->sa_flags & SA_NODEFER) == 0) { 2929 // automaticlly block the signal 2930 sigaddset(&(actp->sa_mask), sig); 2931 } 2932 2933 sa_handler_t hand; 2934 sa_sigaction_t sa; 2935 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2936 // retrieve the chained handler 2937 if (siginfo_flag_set) { 2938 sa = actp->sa_sigaction; 2939 } else { 2940 hand = actp->sa_handler; 2941 } 2942 2943 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2944 actp->sa_handler = SIG_DFL; 2945 } 2946 2947 // try to honor the signal mask 2948 sigset_t oset; 2949 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2950 2951 // call into the chained handler 2952 if (siginfo_flag_set) { 2953 (*sa)(sig, siginfo, context); 2954 } else { 2955 (*hand)(sig); 2956 } 2957 2958 // restore the signal mask 2959 pthread_sigmask(SIG_SETMASK, &oset, 0); 2960 } 2961 // Tell jvm's signal handler the signal is taken care of. 2962 return true; 2963} 2964 2965bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2966 bool chained = false; 2967 // signal-chaining 2968 if (UseSignalChaining) { 2969 struct sigaction *actp = get_chained_signal_action(sig); 2970 if (actp != NULL) { 2971 chained = call_chained_handler(actp, sig, siginfo, context); 2972 } 2973 } 2974 return chained; 2975} 2976 2977struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2978 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 2979 return &sigact[sig]; 2980 } 2981 return NULL; 2982} 2983 2984void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2985 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2986 sigact[sig] = oldAct; 2987 sigs |= (unsigned int)1 << sig; 2988} 2989 2990// for diagnostic 2991int os::Bsd::sigflags[MAXSIGNUM]; 2992 2993int os::Bsd::get_our_sigflags(int sig) { 2994 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2995 return sigflags[sig]; 2996} 2997 2998void os::Bsd::set_our_sigflags(int sig, int flags) { 2999 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3000 sigflags[sig] = flags; 3001} 3002 3003void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3004 // Check for overwrite. 3005 struct sigaction oldAct; 3006 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3007 3008 void* oldhand = oldAct.sa_sigaction 3009 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3010 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3011 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3012 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3013 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3014 if (AllowUserSignalHandlers || !set_installed) { 3015 // Do not overwrite; user takes responsibility to forward to us. 3016 return; 3017 } else if (UseSignalChaining) { 3018 // save the old handler in jvm 3019 save_preinstalled_handler(sig, oldAct); 3020 // libjsig also interposes the sigaction() call below and saves the 3021 // old sigaction on it own. 3022 } else { 3023 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3024 "%#lx for signal %d.", (long)oldhand, sig)); 3025 } 3026 } 3027 3028 struct sigaction sigAct; 3029 sigfillset(&(sigAct.sa_mask)); 3030 sigAct.sa_handler = SIG_DFL; 3031 if (!set_installed) { 3032 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3033 } else { 3034 sigAct.sa_sigaction = signalHandler; 3035 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3036 } 3037 // Save flags, which are set by ours 3038 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3039 sigflags[sig] = sigAct.sa_flags; 3040 3041 int ret = sigaction(sig, &sigAct, &oldAct); 3042 assert(ret == 0, "check"); 3043 3044 void* oldhand2 = oldAct.sa_sigaction 3045 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3046 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3047 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3048} 3049 3050// install signal handlers for signals that HotSpot needs to 3051// handle in order to support Java-level exception handling. 3052 3053void os::Bsd::install_signal_handlers() { 3054 if (!signal_handlers_are_installed) { 3055 signal_handlers_are_installed = true; 3056 3057 // signal-chaining 3058 typedef void (*signal_setting_t)(); 3059 signal_setting_t begin_signal_setting = NULL; 3060 signal_setting_t end_signal_setting = NULL; 3061 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3062 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3063 if (begin_signal_setting != NULL) { 3064 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3065 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3066 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3067 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3068 libjsig_is_loaded = true; 3069 assert(UseSignalChaining, "should enable signal-chaining"); 3070 } 3071 if (libjsig_is_loaded) { 3072 // Tell libjsig jvm is setting signal handlers 3073 (*begin_signal_setting)(); 3074 } 3075 3076 set_signal_handler(SIGSEGV, true); 3077 set_signal_handler(SIGPIPE, true); 3078 set_signal_handler(SIGBUS, true); 3079 set_signal_handler(SIGILL, true); 3080 set_signal_handler(SIGFPE, true); 3081 set_signal_handler(SIGXFSZ, true); 3082 3083#if defined(__APPLE__) 3084 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3085 // signals caught and handled by the JVM. To work around this, we reset the mach task 3086 // signal handler that's placed on our process by CrashReporter. This disables 3087 // CrashReporter-based reporting. 3088 // 3089 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3090 // on caught fatal signals. 3091 // 3092 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3093 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3094 // exception handling, while leaving the standard BSD signal handlers functional. 3095 kern_return_t kr; 3096 kr = task_set_exception_ports(mach_task_self(), 3097 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3098 MACH_PORT_NULL, 3099 EXCEPTION_STATE_IDENTITY, 3100 MACHINE_THREAD_STATE); 3101 3102 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3103#endif 3104 3105 if (libjsig_is_loaded) { 3106 // Tell libjsig jvm finishes setting signal handlers 3107 (*end_signal_setting)(); 3108 } 3109 3110 // We don't activate signal checker if libjsig is in place, we trust ourselves 3111 // and if UserSignalHandler is installed all bets are off 3112 if (CheckJNICalls) { 3113 if (libjsig_is_loaded) { 3114 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3115 check_signals = false; 3116 } 3117 if (AllowUserSignalHandlers) { 3118 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3119 check_signals = false; 3120 } 3121 } 3122 } 3123} 3124 3125 3126///// 3127// glibc on Bsd platform uses non-documented flag 3128// to indicate, that some special sort of signal 3129// trampoline is used. 3130// We will never set this flag, and we should 3131// ignore this flag in our diagnostic 3132#ifdef SIGNIFICANT_SIGNAL_MASK 3133#undef SIGNIFICANT_SIGNAL_MASK 3134#endif 3135#define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3136 3137static const char* get_signal_handler_name(address handler, 3138 char* buf, int buflen) { 3139 int offset; 3140 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3141 if (found) { 3142 // skip directory names 3143 const char *p1, *p2; 3144 p1 = buf; 3145 size_t len = strlen(os::file_separator()); 3146 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3147 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3148 } else { 3149 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3150 } 3151 return buf; 3152} 3153 3154static void print_signal_handler(outputStream* st, int sig, 3155 char* buf, size_t buflen) { 3156 struct sigaction sa; 3157 3158 sigaction(sig, NULL, &sa); 3159 3160 // See comment for SIGNIFICANT_SIGNAL_MASK define 3161 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3162 3163 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3164 3165 address handler = (sa.sa_flags & SA_SIGINFO) 3166 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3167 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3168 3169 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3170 st->print("SIG_DFL"); 3171 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3172 st->print("SIG_IGN"); 3173 } else { 3174 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3175 } 3176 3177 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3178 3179 address rh = VMError::get_resetted_sighandler(sig); 3180 // May be, handler was resetted by VMError? 3181 if(rh != NULL) { 3182 handler = rh; 3183 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3184 } 3185 3186 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3187 3188 // Check: is it our handler? 3189 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3190 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3191 // It is our signal handler 3192 // check for flags, reset system-used one! 3193 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3194 st->print( 3195 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3196 os::Bsd::get_our_sigflags(sig)); 3197 } 3198 } 3199 st->cr(); 3200} 3201 3202 3203#define DO_SIGNAL_CHECK(sig) \ 3204 if (!sigismember(&check_signal_done, sig)) \ 3205 os::Bsd::check_signal_handler(sig) 3206 3207// This method is a periodic task to check for misbehaving JNI applications 3208// under CheckJNI, we can add any periodic checks here 3209 3210void os::run_periodic_checks() { 3211 3212 if (check_signals == false) return; 3213 3214 // SEGV and BUS if overridden could potentially prevent 3215 // generation of hs*.log in the event of a crash, debugging 3216 // such a case can be very challenging, so we absolutely 3217 // check the following for a good measure: 3218 DO_SIGNAL_CHECK(SIGSEGV); 3219 DO_SIGNAL_CHECK(SIGILL); 3220 DO_SIGNAL_CHECK(SIGFPE); 3221 DO_SIGNAL_CHECK(SIGBUS); 3222 DO_SIGNAL_CHECK(SIGPIPE); 3223 DO_SIGNAL_CHECK(SIGXFSZ); 3224 3225 3226 // ReduceSignalUsage allows the user to override these handlers 3227 // see comments at the very top and jvm_solaris.h 3228 if (!ReduceSignalUsage) { 3229 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3230 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3231 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3232 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3233 } 3234 3235 DO_SIGNAL_CHECK(SR_signum); 3236 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3237} 3238 3239typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3240 3241static os_sigaction_t os_sigaction = NULL; 3242 3243void os::Bsd::check_signal_handler(int sig) { 3244 char buf[O_BUFLEN]; 3245 address jvmHandler = NULL; 3246 3247 3248 struct sigaction act; 3249 if (os_sigaction == NULL) { 3250 // only trust the default sigaction, in case it has been interposed 3251 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3252 if (os_sigaction == NULL) return; 3253 } 3254 3255 os_sigaction(sig, (struct sigaction*)NULL, &act); 3256 3257 3258 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3259 3260 address thisHandler = (act.sa_flags & SA_SIGINFO) 3261 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3262 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3263 3264 3265 switch(sig) { 3266 case SIGSEGV: 3267 case SIGBUS: 3268 case SIGFPE: 3269 case SIGPIPE: 3270 case SIGILL: 3271 case SIGXFSZ: 3272 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3273 break; 3274 3275 case SHUTDOWN1_SIGNAL: 3276 case SHUTDOWN2_SIGNAL: 3277 case SHUTDOWN3_SIGNAL: 3278 case BREAK_SIGNAL: 3279 jvmHandler = (address)user_handler(); 3280 break; 3281 3282 case INTERRUPT_SIGNAL: 3283 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3284 break; 3285 3286 default: 3287 if (sig == SR_signum) { 3288 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3289 } else { 3290 return; 3291 } 3292 break; 3293 } 3294 3295 if (thisHandler != jvmHandler) { 3296 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3297 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3298 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3299 // No need to check this sig any longer 3300 sigaddset(&check_signal_done, sig); 3301 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3302 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3303 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3304 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3305 // No need to check this sig any longer 3306 sigaddset(&check_signal_done, sig); 3307 } 3308 3309 // Dump all the signal 3310 if (sigismember(&check_signal_done, sig)) { 3311 print_signal_handlers(tty, buf, O_BUFLEN); 3312 } 3313} 3314 3315extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3316 3317extern bool signal_name(int signo, char* buf, size_t len); 3318 3319const char* os::exception_name(int exception_code, char* buf, size_t size) { 3320 if (0 < exception_code && exception_code <= SIGRTMAX) { 3321 // signal 3322 if (!signal_name(exception_code, buf, size)) { 3323 jio_snprintf(buf, size, "SIG%d", exception_code); 3324 } 3325 return buf; 3326 } else { 3327 return NULL; 3328 } 3329} 3330 3331// this is called _before_ the most of global arguments have been parsed 3332void os::init(void) { 3333 char dummy; /* used to get a guess on initial stack address */ 3334// first_hrtime = gethrtime(); 3335 3336 // With BsdThreads the JavaMain thread pid (primordial thread) 3337 // is different than the pid of the java launcher thread. 3338 // So, on Bsd, the launcher thread pid is passed to the VM 3339 // via the sun.java.launcher.pid property. 3340 // Use this property instead of getpid() if it was correctly passed. 3341 // See bug 6351349. 3342 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3343 3344 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3345 3346 clock_tics_per_sec = CLK_TCK; 3347 3348 init_random(1234567); 3349 3350 ThreadCritical::initialize(); 3351 3352 Bsd::set_page_size(getpagesize()); 3353 if (Bsd::page_size() == -1) { 3354 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3355 strerror(errno))); 3356 } 3357 init_page_sizes((size_t) Bsd::page_size()); 3358 3359 Bsd::initialize_system_info(); 3360 3361 // main_thread points to the aboriginal thread 3362 Bsd::_main_thread = pthread_self(); 3363 3364 Bsd::clock_init(); 3365 initial_time_count = os::elapsed_counter(); 3366 3367#ifdef __APPLE__ 3368 // XXXDARWIN 3369 // Work around the unaligned VM callbacks in hotspot's 3370 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3371 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3372 // alignment when doing symbol lookup. To work around this, we force early 3373 // binding of all symbols now, thus binding when alignment is known-good. 3374 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3375#endif 3376} 3377 3378// To install functions for atexit system call 3379extern "C" { 3380 static void perfMemory_exit_helper() { 3381 perfMemory_exit(); 3382 } 3383} 3384 3385// this is called _after_ the global arguments have been parsed 3386jint os::init_2(void) 3387{ 3388 // Allocate a single page and mark it as readable for safepoint polling 3389 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3390 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3391 3392 os::set_polling_page( polling_page ); 3393 3394#ifndef PRODUCT 3395 if(Verbose && PrintMiscellaneous) 3396 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3397#endif 3398 3399 if (!UseMembar) { 3400 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3401 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 3402 os::set_memory_serialize_page( mem_serialize_page ); 3403 3404#ifndef PRODUCT 3405 if(Verbose && PrintMiscellaneous) 3406 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3407#endif 3408 } 3409 3410 os::large_page_init(); 3411 3412 // initialize suspend/resume support - must do this before signal_sets_init() 3413 if (SR_initialize() != 0) { 3414 perror("SR_initialize failed"); 3415 return JNI_ERR; 3416 } 3417 3418 Bsd::signal_sets_init(); 3419 Bsd::install_signal_handlers(); 3420 3421 // Check minimum allowable stack size for thread creation and to initialize 3422 // the java system classes, including StackOverflowError - depends on page 3423 // size. Add a page for compiler2 recursion in main thread. 3424 // Add in 2*BytesPerWord times page size to account for VM stack during 3425 // class initialization depending on 32 or 64 bit VM. 3426 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3427 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3428 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3429 3430 size_t threadStackSizeInBytes = ThreadStackSize * K; 3431 if (threadStackSizeInBytes != 0 && 3432 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3433 tty->print_cr("\nThe stack size specified is too small, " 3434 "Specify at least %dk", 3435 os::Bsd::min_stack_allowed/ K); 3436 return JNI_ERR; 3437 } 3438 3439 // Make the stack size a multiple of the page size so that 3440 // the yellow/red zones can be guarded. 3441 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3442 vm_page_size())); 3443 3444 if (MaxFDLimit) { 3445 // set the number of file descriptors to max. print out error 3446 // if getrlimit/setrlimit fails but continue regardless. 3447 struct rlimit nbr_files; 3448 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3449 if (status != 0) { 3450 if (PrintMiscellaneous && (Verbose || WizardMode)) 3451 perror("os::init_2 getrlimit failed"); 3452 } else { 3453 nbr_files.rlim_cur = nbr_files.rlim_max; 3454 3455#ifdef __APPLE__ 3456 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3457 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3458 // be used instead 3459 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3460#endif 3461 3462 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3463 if (status != 0) { 3464 if (PrintMiscellaneous && (Verbose || WizardMode)) 3465 perror("os::init_2 setrlimit failed"); 3466 } 3467 } 3468 } 3469 3470 // at-exit methods are called in the reverse order of their registration. 3471 // atexit functions are called on return from main or as a result of a 3472 // call to exit(3C). There can be only 32 of these functions registered 3473 // and atexit() does not set errno. 3474 3475 if (PerfAllowAtExitRegistration) { 3476 // only register atexit functions if PerfAllowAtExitRegistration is set. 3477 // atexit functions can be delayed until process exit time, which 3478 // can be problematic for embedded VM situations. Embedded VMs should 3479 // call DestroyJavaVM() to assure that VM resources are released. 3480 3481 // note: perfMemory_exit_helper atexit function may be removed in 3482 // the future if the appropriate cleanup code can be added to the 3483 // VM_Exit VMOperation's doit method. 3484 if (atexit(perfMemory_exit_helper) != 0) { 3485 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3486 } 3487 } 3488 3489 // initialize thread priority policy 3490 prio_init(); 3491 3492#ifdef __APPLE__ 3493 // dynamically link to objective c gc registration 3494 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3495 if (handleLibObjc != NULL) { 3496 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3497 } 3498#endif 3499 3500 return JNI_OK; 3501} 3502 3503// this is called at the end of vm_initialization 3504void os::init_3(void) { } 3505 3506// Mark the polling page as unreadable 3507void os::make_polling_page_unreadable(void) { 3508 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3509 fatal("Could not disable polling page"); 3510}; 3511 3512// Mark the polling page as readable 3513void os::make_polling_page_readable(void) { 3514 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3515 fatal("Could not enable polling page"); 3516 } 3517}; 3518 3519int os::active_processor_count() { 3520 return _processor_count; 3521} 3522 3523void os::set_native_thread_name(const char *name) { 3524#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3525 // This is only supported in Snow Leopard and beyond 3526 if (name != NULL) { 3527 // Add a "Java: " prefix to the name 3528 char buf[MAXTHREADNAMESIZE]; 3529 snprintf(buf, sizeof(buf), "Java: %s", name); 3530 pthread_setname_np(buf); 3531 } 3532#endif 3533} 3534 3535bool os::distribute_processes(uint length, uint* distribution) { 3536 // Not yet implemented. 3537 return false; 3538} 3539 3540bool os::bind_to_processor(uint processor_id) { 3541 // Not yet implemented. 3542 return false; 3543} 3544 3545/// 3546 3547// Suspends the target using the signal mechanism and then grabs the PC before 3548// resuming the target. Used by the flat-profiler only 3549ExtendedPC os::get_thread_pc(Thread* thread) { 3550 // Make sure that it is called by the watcher for the VMThread 3551 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3552 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3553 3554 ExtendedPC epc; 3555 3556 OSThread* osthread = thread->osthread(); 3557 if (do_suspend(osthread)) { 3558 if (osthread->ucontext() != NULL) { 3559 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 3560 } else { 3561 // NULL context is unexpected, double-check this is the VMThread 3562 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3563 } 3564 do_resume(osthread); 3565 } 3566 // failure means pthread_kill failed for some reason - arguably this is 3567 // a fatal problem, but such problems are ignored elsewhere 3568 3569 return epc; 3570} 3571 3572int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3573{ 3574 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3575} 3576 3577//////////////////////////////////////////////////////////////////////////////// 3578// debug support 3579 3580bool os::find(address addr, outputStream* st) { 3581 Dl_info dlinfo; 3582 memset(&dlinfo, 0, sizeof(dlinfo)); 3583 if (dladdr(addr, &dlinfo)) { 3584 st->print(PTR_FORMAT ": ", addr); 3585 if (dlinfo.dli_sname != NULL) { 3586 st->print("%s+%#x", dlinfo.dli_sname, 3587 addr - (intptr_t)dlinfo.dli_saddr); 3588 } else if (dlinfo.dli_fname) { 3589 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3590 } else { 3591 st->print("<absolute address>"); 3592 } 3593 if (dlinfo.dli_fname) { 3594 st->print(" in %s", dlinfo.dli_fname); 3595 } 3596 if (dlinfo.dli_fbase) { 3597 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3598 } 3599 st->cr(); 3600 3601 if (Verbose) { 3602 // decode some bytes around the PC 3603 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3604 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3605 address lowest = (address) dlinfo.dli_sname; 3606 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3607 if (begin < lowest) begin = lowest; 3608 Dl_info dlinfo2; 3609 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 3610 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3611 end = (address) dlinfo2.dli_saddr; 3612 Disassembler::decode(begin, end, st); 3613 } 3614 return true; 3615 } 3616 return false; 3617} 3618 3619//////////////////////////////////////////////////////////////////////////////// 3620// misc 3621 3622// This does not do anything on Bsd. This is basically a hook for being 3623// able to use structured exception handling (thread-local exception filters) 3624// on, e.g., Win32. 3625void 3626os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3627 JavaCallArguments* args, Thread* thread) { 3628 f(value, method, args, thread); 3629} 3630 3631void os::print_statistics() { 3632} 3633 3634int os::message_box(const char* title, const char* message) { 3635 int i; 3636 fdStream err(defaultStream::error_fd()); 3637 for (i = 0; i < 78; i++) err.print_raw("="); 3638 err.cr(); 3639 err.print_raw_cr(title); 3640 for (i = 0; i < 78; i++) err.print_raw("-"); 3641 err.cr(); 3642 err.print_raw_cr(message); 3643 for (i = 0; i < 78; i++) err.print_raw("="); 3644 err.cr(); 3645 3646 char buf[16]; 3647 // Prevent process from exiting upon "read error" without consuming all CPU 3648 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3649 3650 return buf[0] == 'y' || buf[0] == 'Y'; 3651} 3652 3653int os::stat(const char *path, struct stat *sbuf) { 3654 char pathbuf[MAX_PATH]; 3655 if (strlen(path) > MAX_PATH - 1) { 3656 errno = ENAMETOOLONG; 3657 return -1; 3658 } 3659 os::native_path(strcpy(pathbuf, path)); 3660 return ::stat(pathbuf, sbuf); 3661} 3662 3663bool os::check_heap(bool force) { 3664 return true; 3665} 3666 3667int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3668 return ::vsnprintf(buf, count, format, args); 3669} 3670 3671// Is a (classpath) directory empty? 3672bool os::dir_is_empty(const char* path) { 3673 DIR *dir = NULL; 3674 struct dirent *ptr; 3675 3676 dir = opendir(path); 3677 if (dir == NULL) return true; 3678 3679 /* Scan the directory */ 3680 bool result = true; 3681 char buf[sizeof(struct dirent) + MAX_PATH]; 3682 while (result && (ptr = ::readdir(dir)) != NULL) { 3683 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3684 result = false; 3685 } 3686 } 3687 closedir(dir); 3688 return result; 3689} 3690 3691// This code originates from JDK's sysOpen and open64_w 3692// from src/solaris/hpi/src/system_md.c 3693 3694#ifndef O_DELETE 3695#define O_DELETE 0x10000 3696#endif 3697 3698// Open a file. Unlink the file immediately after open returns 3699// if the specified oflag has the O_DELETE flag set. 3700// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3701 3702int os::open(const char *path, int oflag, int mode) { 3703 3704 if (strlen(path) > MAX_PATH - 1) { 3705 errno = ENAMETOOLONG; 3706 return -1; 3707 } 3708 int fd; 3709 int o_delete = (oflag & O_DELETE); 3710 oflag = oflag & ~O_DELETE; 3711 3712 fd = ::open(path, oflag, mode); 3713 if (fd == -1) return -1; 3714 3715 //If the open succeeded, the file might still be a directory 3716 { 3717 struct stat buf; 3718 int ret = ::fstat(fd, &buf); 3719 int st_mode = buf.st_mode; 3720 3721 if (ret != -1) { 3722 if ((st_mode & S_IFMT) == S_IFDIR) { 3723 errno = EISDIR; 3724 ::close(fd); 3725 return -1; 3726 } 3727 } else { 3728 ::close(fd); 3729 return -1; 3730 } 3731 } 3732 3733 /* 3734 * All file descriptors that are opened in the JVM and not 3735 * specifically destined for a subprocess should have the 3736 * close-on-exec flag set. If we don't set it, then careless 3rd 3737 * party native code might fork and exec without closing all 3738 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3739 * UNIXProcess.c), and this in turn might: 3740 * 3741 * - cause end-of-file to fail to be detected on some file 3742 * descriptors, resulting in mysterious hangs, or 3743 * 3744 * - might cause an fopen in the subprocess to fail on a system 3745 * suffering from bug 1085341. 3746 * 3747 * (Yes, the default setting of the close-on-exec flag is a Unix 3748 * design flaw) 3749 * 3750 * See: 3751 * 1085341: 32-bit stdio routines should support file descriptors >255 3752 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3753 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3754 */ 3755#ifdef FD_CLOEXEC 3756 { 3757 int flags = ::fcntl(fd, F_GETFD); 3758 if (flags != -1) 3759 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3760 } 3761#endif 3762 3763 if (o_delete != 0) { 3764 ::unlink(path); 3765 } 3766 return fd; 3767} 3768 3769 3770// create binary file, rewriting existing file if required 3771int os::create_binary_file(const char* path, bool rewrite_existing) { 3772 int oflags = O_WRONLY | O_CREAT; 3773 if (!rewrite_existing) { 3774 oflags |= O_EXCL; 3775 } 3776 return ::open(path, oflags, S_IREAD | S_IWRITE); 3777} 3778 3779// return current position of file pointer 3780jlong os::current_file_offset(int fd) { 3781 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3782} 3783 3784// move file pointer to the specified offset 3785jlong os::seek_to_file_offset(int fd, jlong offset) { 3786 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3787} 3788 3789// This code originates from JDK's sysAvailable 3790// from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3791 3792int os::available(int fd, jlong *bytes) { 3793 jlong cur, end; 3794 int mode; 3795 struct stat buf; 3796 3797 if (::fstat(fd, &buf) >= 0) { 3798 mode = buf.st_mode; 3799 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3800 /* 3801 * XXX: is the following call interruptible? If so, this might 3802 * need to go through the INTERRUPT_IO() wrapper as for other 3803 * blocking, interruptible calls in this file. 3804 */ 3805 int n; 3806 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3807 *bytes = n; 3808 return 1; 3809 } 3810 } 3811 } 3812 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3813 return 0; 3814 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3815 return 0; 3816 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3817 return 0; 3818 } 3819 *bytes = end - cur; 3820 return 1; 3821} 3822 3823int os::socket_available(int fd, jint *pbytes) { 3824 if (fd < 0) 3825 return OS_OK; 3826 3827 int ret; 3828 3829 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 3830 3831 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 3832 // is expected to return 0 on failure and 1 on success to the jdk. 3833 3834 return (ret == OS_ERR) ? 0 : 1; 3835} 3836 3837// Map a block of memory. 3838char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3839 char *addr, size_t bytes, bool read_only, 3840 bool allow_exec) { 3841 int prot; 3842 int flags; 3843 3844 if (read_only) { 3845 prot = PROT_READ; 3846 flags = MAP_SHARED; 3847 } else { 3848 prot = PROT_READ | PROT_WRITE; 3849 flags = MAP_PRIVATE; 3850 } 3851 3852 if (allow_exec) { 3853 prot |= PROT_EXEC; 3854 } 3855 3856 if (addr != NULL) { 3857 flags |= MAP_FIXED; 3858 } 3859 3860 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3861 fd, file_offset); 3862 if (mapped_address == MAP_FAILED) { 3863 return NULL; 3864 } 3865 return mapped_address; 3866} 3867 3868 3869// Remap a block of memory. 3870char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3871 char *addr, size_t bytes, bool read_only, 3872 bool allow_exec) { 3873 // same as map_memory() on this OS 3874 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3875 allow_exec); 3876} 3877 3878 3879// Unmap a block of memory. 3880bool os::pd_unmap_memory(char* addr, size_t bytes) { 3881 return munmap(addr, bytes) == 0; 3882} 3883 3884// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3885// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3886// of a thread. 3887// 3888// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3889// the fast estimate available on the platform. 3890 3891jlong os::current_thread_cpu_time() { 3892#ifdef __APPLE__ 3893 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3894#else 3895 Unimplemented(); 3896 return 0; 3897#endif 3898} 3899 3900jlong os::thread_cpu_time(Thread* thread) { 3901#ifdef __APPLE__ 3902 return os::thread_cpu_time(thread, true /* user + sys */); 3903#else 3904 Unimplemented(); 3905 return 0; 3906#endif 3907} 3908 3909jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3910#ifdef __APPLE__ 3911 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3912#else 3913 Unimplemented(); 3914 return 0; 3915#endif 3916} 3917 3918jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3919#ifdef __APPLE__ 3920 struct thread_basic_info tinfo; 3921 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3922 kern_return_t kr; 3923 thread_t mach_thread; 3924 3925 mach_thread = thread->osthread()->thread_id(); 3926 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3927 if (kr != KERN_SUCCESS) 3928 return -1; 3929 3930 if (user_sys_cpu_time) { 3931 jlong nanos; 3932 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3933 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3934 return nanos; 3935 } else { 3936 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3937 } 3938#else 3939 Unimplemented(); 3940 return 0; 3941#endif 3942} 3943 3944 3945void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3946 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3947 info_ptr->may_skip_backward = false; // elapsed time not wall time 3948 info_ptr->may_skip_forward = false; // elapsed time not wall time 3949 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3950} 3951 3952void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3953 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3954 info_ptr->may_skip_backward = false; // elapsed time not wall time 3955 info_ptr->may_skip_forward = false; // elapsed time not wall time 3956 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3957} 3958 3959bool os::is_thread_cpu_time_supported() { 3960#ifdef __APPLE__ 3961 return true; 3962#else 3963 return false; 3964#endif 3965} 3966 3967// System loadavg support. Returns -1 if load average cannot be obtained. 3968// Bsd doesn't yet have a (official) notion of processor sets, 3969// so just return the system wide load average. 3970int os::loadavg(double loadavg[], int nelem) { 3971 return ::getloadavg(loadavg, nelem); 3972} 3973 3974void os::pause() { 3975 char filename[MAX_PATH]; 3976 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3977 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3978 } else { 3979 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3980 } 3981 3982 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3983 if (fd != -1) { 3984 struct stat buf; 3985 ::close(fd); 3986 while (::stat(filename, &buf) == 0) { 3987 (void)::poll(NULL, 0, 100); 3988 } 3989 } else { 3990 jio_fprintf(stderr, 3991 "Could not open pause file '%s', continuing immediately.\n", filename); 3992 } 3993} 3994 3995 3996// Refer to the comments in os_solaris.cpp park-unpark. 3997// 3998// Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 3999// hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 4000// For specifics regarding the bug see GLIBC BUGID 261237 : 4001// http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 4002// Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 4003// will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4004// is used. (The simple C test-case provided in the GLIBC bug report manifests the 4005// hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4006// and monitorenter when we're using 1-0 locking. All those operations may result in 4007// calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4008// of libpthread avoids the problem, but isn't practical. 4009// 4010// Possible remedies: 4011// 4012// 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4013// This is palliative and probabilistic, however. If the thread is preempted 4014// between the call to compute_abstime() and pthread_cond_timedwait(), more 4015// than the minimum period may have passed, and the abstime may be stale (in the 4016// past) resultin in a hang. Using this technique reduces the odds of a hang 4017// but the JVM is still vulnerable, particularly on heavily loaded systems. 4018// 4019// 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4020// of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4021// NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4022// reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4023// thread. 4024// 4025// 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4026// that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4027// a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4028// This also works well. In fact it avoids kernel-level scalability impediments 4029// on certain platforms that don't handle lots of active pthread_cond_timedwait() 4030// timers in a graceful fashion. 4031// 4032// 4. When the abstime value is in the past it appears that control returns 4033// correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4034// Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4035// can avoid the problem by reinitializing the condvar -- by cond_destroy() 4036// followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4037// It may be possible to avoid reinitialization by checking the return 4038// value from pthread_cond_timedwait(). In addition to reinitializing the 4039// condvar we must establish the invariant that cond_signal() is only called 4040// within critical sections protected by the adjunct mutex. This prevents 4041// cond_signal() from "seeing" a condvar that's in the midst of being 4042// reinitialized or that is corrupt. Sadly, this invariant obviates the 4043// desirable signal-after-unlock optimization that avoids futile context switching. 4044// 4045// I'm also concerned that some versions of NTPL might allocate an auxilliary 4046// structure when a condvar is used or initialized. cond_destroy() would 4047// release the helper structure. Our reinitialize-after-timedwait fix 4048// put excessive stress on malloc/free and locks protecting the c-heap. 4049// 4050// We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4051// It may be possible to refine (4) by checking the kernel and NTPL verisons 4052// and only enabling the work-around for vulnerable environments. 4053 4054// utility to compute the abstime argument to timedwait: 4055// millis is the relative timeout time 4056// abstime will be the absolute timeout time 4057// TODO: replace compute_abstime() with unpackTime() 4058 4059static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4060 if (millis < 0) millis = 0; 4061 struct timeval now; 4062 int status = gettimeofday(&now, NULL); 4063 assert(status == 0, "gettimeofday"); 4064 jlong seconds = millis / 1000; 4065 millis %= 1000; 4066 if (seconds > 50000000) { // see man cond_timedwait(3T) 4067 seconds = 50000000; 4068 } 4069 abstime->tv_sec = now.tv_sec + seconds; 4070 long usec = now.tv_usec + millis * 1000; 4071 if (usec >= 1000000) { 4072 abstime->tv_sec += 1; 4073 usec -= 1000000; 4074 } 4075 abstime->tv_nsec = usec * 1000; 4076 return abstime; 4077} 4078 4079 4080// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4081// Conceptually TryPark() should be equivalent to park(0). 4082 4083int os::PlatformEvent::TryPark() { 4084 for (;;) { 4085 const int v = _Event ; 4086 guarantee ((v == 0) || (v == 1), "invariant") ; 4087 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4088 } 4089} 4090 4091void os::PlatformEvent::park() { // AKA "down()" 4092 // Invariant: Only the thread associated with the Event/PlatformEvent 4093 // may call park(). 4094 // TODO: assert that _Assoc != NULL or _Assoc == Self 4095 int v ; 4096 for (;;) { 4097 v = _Event ; 4098 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4099 } 4100 guarantee (v >= 0, "invariant") ; 4101 if (v == 0) { 4102 // Do this the hard way by blocking ... 4103 int status = pthread_mutex_lock(_mutex); 4104 assert_status(status == 0, status, "mutex_lock"); 4105 guarantee (_nParked == 0, "invariant") ; 4106 ++ _nParked ; 4107 while (_Event < 0) { 4108 status = pthread_cond_wait(_cond, _mutex); 4109 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4110 // Treat this the same as if the wait was interrupted 4111 if (status == ETIMEDOUT) { status = EINTR; } 4112 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4113 } 4114 -- _nParked ; 4115 4116 _Event = 0 ; 4117 status = pthread_mutex_unlock(_mutex); 4118 assert_status(status == 0, status, "mutex_unlock"); 4119 // Paranoia to ensure our locked and lock-free paths interact 4120 // correctly with each other. 4121 OrderAccess::fence(); 4122 } 4123 guarantee (_Event >= 0, "invariant") ; 4124} 4125 4126int os::PlatformEvent::park(jlong millis) { 4127 guarantee (_nParked == 0, "invariant") ; 4128 4129 int v ; 4130 for (;;) { 4131 v = _Event ; 4132 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4133 } 4134 guarantee (v >= 0, "invariant") ; 4135 if (v != 0) return OS_OK ; 4136 4137 // We do this the hard way, by blocking the thread. 4138 // Consider enforcing a minimum timeout value. 4139 struct timespec abst; 4140 compute_abstime(&abst, millis); 4141 4142 int ret = OS_TIMEOUT; 4143 int status = pthread_mutex_lock(_mutex); 4144 assert_status(status == 0, status, "mutex_lock"); 4145 guarantee (_nParked == 0, "invariant") ; 4146 ++_nParked ; 4147 4148 // Object.wait(timo) will return because of 4149 // (a) notification 4150 // (b) timeout 4151 // (c) thread.interrupt 4152 // 4153 // Thread.interrupt and object.notify{All} both call Event::set. 4154 // That is, we treat thread.interrupt as a special case of notification. 4155 // The underlying Solaris implementation, cond_timedwait, admits 4156 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4157 // JVM from making those visible to Java code. As such, we must 4158 // filter out spurious wakeups. We assume all ETIME returns are valid. 4159 // 4160 // TODO: properly differentiate simultaneous notify+interrupt. 4161 // In that case, we should propagate the notify to another waiter. 4162 4163 while (_Event < 0) { 4164 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4165 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4166 pthread_cond_destroy (_cond); 4167 pthread_cond_init (_cond, NULL) ; 4168 } 4169 assert_status(status == 0 || status == EINTR || 4170 status == ETIMEDOUT, 4171 status, "cond_timedwait"); 4172 if (!FilterSpuriousWakeups) break ; // previous semantics 4173 if (status == ETIMEDOUT) break ; 4174 // We consume and ignore EINTR and spurious wakeups. 4175 } 4176 --_nParked ; 4177 if (_Event >= 0) { 4178 ret = OS_OK; 4179 } 4180 _Event = 0 ; 4181 status = pthread_mutex_unlock(_mutex); 4182 assert_status(status == 0, status, "mutex_unlock"); 4183 assert (_nParked == 0, "invariant") ; 4184 // Paranoia to ensure our locked and lock-free paths interact 4185 // correctly with each other. 4186 OrderAccess::fence(); 4187 return ret; 4188} 4189 4190void os::PlatformEvent::unpark() { 4191 // Transitions for _Event: 4192 // 0 :=> 1 4193 // 1 :=> 1 4194 // -1 :=> either 0 or 1; must signal target thread 4195 // That is, we can safely transition _Event from -1 to either 4196 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4197 // unpark() calls. 4198 // See also: "Semaphores in Plan 9" by Mullender & Cox 4199 // 4200 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4201 // that it will take two back-to-back park() calls for the owning 4202 // thread to block. This has the benefit of forcing a spurious return 4203 // from the first park() call after an unpark() call which will help 4204 // shake out uses of park() and unpark() without condition variables. 4205 4206 if (Atomic::xchg(1, &_Event) >= 0) return; 4207 4208 // Wait for the thread associated with the event to vacate 4209 int status = pthread_mutex_lock(_mutex); 4210 assert_status(status == 0, status, "mutex_lock"); 4211 int AnyWaiters = _nParked; 4212 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4213 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4214 AnyWaiters = 0; 4215 pthread_cond_signal(_cond); 4216 } 4217 status = pthread_mutex_unlock(_mutex); 4218 assert_status(status == 0, status, "mutex_unlock"); 4219 if (AnyWaiters != 0) { 4220 status = pthread_cond_signal(_cond); 4221 assert_status(status == 0, status, "cond_signal"); 4222 } 4223 4224 // Note that we signal() _after dropping the lock for "immortal" Events. 4225 // This is safe and avoids a common class of futile wakeups. In rare 4226 // circumstances this can cause a thread to return prematurely from 4227 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4228 // simply re-test the condition and re-park itself. 4229} 4230 4231 4232// JSR166 4233// ------------------------------------------------------- 4234 4235/* 4236 * The solaris and bsd implementations of park/unpark are fairly 4237 * conservative for now, but can be improved. They currently use a 4238 * mutex/condvar pair, plus a a count. 4239 * Park decrements count if > 0, else does a condvar wait. Unpark 4240 * sets count to 1 and signals condvar. Only one thread ever waits 4241 * on the condvar. Contention seen when trying to park implies that someone 4242 * is unparking you, so don't wait. And spurious returns are fine, so there 4243 * is no need to track notifications. 4244 */ 4245 4246#define MAX_SECS 100000000 4247/* 4248 * This code is common to bsd and solaris and will be moved to a 4249 * common place in dolphin. 4250 * 4251 * The passed in time value is either a relative time in nanoseconds 4252 * or an absolute time in milliseconds. Either way it has to be unpacked 4253 * into suitable seconds and nanoseconds components and stored in the 4254 * given timespec structure. 4255 * Given time is a 64-bit value and the time_t used in the timespec is only 4256 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4257 * overflow if times way in the future are given. Further on Solaris versions 4258 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4259 * number of seconds, in abstime, is less than current_time + 100,000,000. 4260 * As it will be 28 years before "now + 100000000" will overflow we can 4261 * ignore overflow and just impose a hard-limit on seconds using the value 4262 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4263 * years from "now". 4264 */ 4265 4266static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4267 assert (time > 0, "convertTime"); 4268 4269 struct timeval now; 4270 int status = gettimeofday(&now, NULL); 4271 assert(status == 0, "gettimeofday"); 4272 4273 time_t max_secs = now.tv_sec + MAX_SECS; 4274 4275 if (isAbsolute) { 4276 jlong secs = time / 1000; 4277 if (secs > max_secs) { 4278 absTime->tv_sec = max_secs; 4279 } 4280 else { 4281 absTime->tv_sec = secs; 4282 } 4283 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4284 } 4285 else { 4286 jlong secs = time / NANOSECS_PER_SEC; 4287 if (secs >= MAX_SECS) { 4288 absTime->tv_sec = max_secs; 4289 absTime->tv_nsec = 0; 4290 } 4291 else { 4292 absTime->tv_sec = now.tv_sec + secs; 4293 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4294 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4295 absTime->tv_nsec -= NANOSECS_PER_SEC; 4296 ++absTime->tv_sec; // note: this must be <= max_secs 4297 } 4298 } 4299 } 4300 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4301 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4302 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4303 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4304} 4305 4306void Parker::park(bool isAbsolute, jlong time) { 4307 // Ideally we'd do something useful while spinning, such 4308 // as calling unpackTime(). 4309 4310 // Optional fast-path check: 4311 // Return immediately if a permit is available. 4312 // We depend on Atomic::xchg() having full barrier semantics 4313 // since we are doing a lock-free update to _counter. 4314 if (Atomic::xchg(0, &_counter) > 0) return; 4315 4316 Thread* thread = Thread::current(); 4317 assert(thread->is_Java_thread(), "Must be JavaThread"); 4318 JavaThread *jt = (JavaThread *)thread; 4319 4320 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4321 // Check interrupt before trying to wait 4322 if (Thread::is_interrupted(thread, false)) { 4323 return; 4324 } 4325 4326 // Next, demultiplex/decode time arguments 4327 struct timespec absTime; 4328 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4329 return; 4330 } 4331 if (time > 0) { 4332 unpackTime(&absTime, isAbsolute, time); 4333 } 4334 4335 4336 // Enter safepoint region 4337 // Beware of deadlocks such as 6317397. 4338 // The per-thread Parker:: mutex is a classic leaf-lock. 4339 // In particular a thread must never block on the Threads_lock while 4340 // holding the Parker:: mutex. If safepoints are pending both the 4341 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4342 ThreadBlockInVM tbivm(jt); 4343 4344 // Don't wait if cannot get lock since interference arises from 4345 // unblocking. Also. check interrupt before trying wait 4346 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4347 return; 4348 } 4349 4350 int status ; 4351 if (_counter > 0) { // no wait needed 4352 _counter = 0; 4353 status = pthread_mutex_unlock(_mutex); 4354 assert (status == 0, "invariant") ; 4355 // Paranoia to ensure our locked and lock-free paths interact 4356 // correctly with each other and Java-level accesses. 4357 OrderAccess::fence(); 4358 return; 4359 } 4360 4361#ifdef ASSERT 4362 // Don't catch signals while blocked; let the running threads have the signals. 4363 // (This allows a debugger to break into the running thread.) 4364 sigset_t oldsigs; 4365 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4366 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4367#endif 4368 4369 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4370 jt->set_suspend_equivalent(); 4371 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4372 4373 if (time == 0) { 4374 status = pthread_cond_wait (_cond, _mutex) ; 4375 } else { 4376 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4377 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4378 pthread_cond_destroy (_cond) ; 4379 pthread_cond_init (_cond, NULL); 4380 } 4381 } 4382 assert_status(status == 0 || status == EINTR || 4383 status == ETIMEDOUT, 4384 status, "cond_timedwait"); 4385 4386#ifdef ASSERT 4387 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4388#endif 4389 4390 _counter = 0 ; 4391 status = pthread_mutex_unlock(_mutex) ; 4392 assert_status(status == 0, status, "invariant") ; 4393 // Paranoia to ensure our locked and lock-free paths interact 4394 // correctly with each other and Java-level accesses. 4395 OrderAccess::fence(); 4396 4397 // If externally suspended while waiting, re-suspend 4398 if (jt->handle_special_suspend_equivalent_condition()) { 4399 jt->java_suspend_self(); 4400 } 4401} 4402 4403void Parker::unpark() { 4404 int s, status ; 4405 status = pthread_mutex_lock(_mutex); 4406 assert (status == 0, "invariant") ; 4407 s = _counter; 4408 _counter = 1; 4409 if (s < 1) { 4410 if (WorkAroundNPTLTimedWaitHang) { 4411 status = pthread_cond_signal (_cond) ; 4412 assert (status == 0, "invariant") ; 4413 status = pthread_mutex_unlock(_mutex); 4414 assert (status == 0, "invariant") ; 4415 } else { 4416 status = pthread_mutex_unlock(_mutex); 4417 assert (status == 0, "invariant") ; 4418 status = pthread_cond_signal (_cond) ; 4419 assert (status == 0, "invariant") ; 4420 } 4421 } else { 4422 pthread_mutex_unlock(_mutex); 4423 assert (status == 0, "invariant") ; 4424 } 4425} 4426 4427 4428/* Darwin has no "environ" in a dynamic library. */ 4429#ifdef __APPLE__ 4430#include <crt_externs.h> 4431#define environ (*_NSGetEnviron()) 4432#else 4433extern char** environ; 4434#endif 4435 4436// Run the specified command in a separate process. Return its exit value, 4437// or -1 on failure (e.g. can't fork a new process). 4438// Unlike system(), this function can be called from signal handler. It 4439// doesn't block SIGINT et al. 4440int os::fork_and_exec(char* cmd) { 4441 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4442 4443 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4444 // pthread_atfork handlers and reset pthread library. All we need is a 4445 // separate process to execve. Make a direct syscall to fork process. 4446 // On IA64 there's no fork syscall, we have to use fork() and hope for 4447 // the best... 4448 pid_t pid = fork(); 4449 4450 if (pid < 0) { 4451 // fork failed 4452 return -1; 4453 4454 } else if (pid == 0) { 4455 // child process 4456 4457 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4458 // first to kill every thread on the thread list. Because this list is 4459 // not reset by fork() (see notes above), execve() will instead kill 4460 // every thread in the parent process. We know this is the only thread 4461 // in the new process, so make a system call directly. 4462 // IA64 should use normal execve() from glibc to match the glibc fork() 4463 // above. 4464 execve("/bin/sh", (char* const*)argv, environ); 4465 4466 // execve failed 4467 _exit(-1); 4468 4469 } else { 4470 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4471 // care about the actual exit code, for now. 4472 4473 int status; 4474 4475 // Wait for the child process to exit. This returns immediately if 4476 // the child has already exited. */ 4477 while (waitpid(pid, &status, 0) < 0) { 4478 switch (errno) { 4479 case ECHILD: return 0; 4480 case EINTR: break; 4481 default: return -1; 4482 } 4483 } 4484 4485 if (WIFEXITED(status)) { 4486 // The child exited normally; get its exit code. 4487 return WEXITSTATUS(status); 4488 } else if (WIFSIGNALED(status)) { 4489 // The child exited because of a signal 4490 // The best value to return is 0x80 + signal number, 4491 // because that is what all Unix shells do, and because 4492 // it allows callers to distinguish between process exit and 4493 // process death by signal. 4494 return 0x80 + WTERMSIG(status); 4495 } else { 4496 // Unknown exit code; pass it through 4497 return status; 4498 } 4499 } 4500} 4501 4502// is_headless_jre() 4503// 4504// Test for the existence of xawt/libmawt.so or libawt_xawt.so 4505// in order to report if we are running in a headless jre 4506// 4507// Since JDK8 xawt/libmawt.so was moved into the same directory 4508// as libawt.so, and renamed libawt_xawt.so 4509// 4510bool os::is_headless_jre() { 4511 struct stat statbuf; 4512 char buf[MAXPATHLEN]; 4513 char libmawtpath[MAXPATHLEN]; 4514 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4515 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4516 char *p; 4517 4518 // Get path to libjvm.so 4519 os::jvm_path(buf, sizeof(buf)); 4520 4521 // Get rid of libjvm.so 4522 p = strrchr(buf, '/'); 4523 if (p == NULL) return false; 4524 else *p = '\0'; 4525 4526 // Get rid of client or server 4527 p = strrchr(buf, '/'); 4528 if (p == NULL) return false; 4529 else *p = '\0'; 4530 4531 // check xawt/libmawt.so 4532 strcpy(libmawtpath, buf); 4533 strcat(libmawtpath, xawtstr); 4534 if (::stat(libmawtpath, &statbuf) == 0) return false; 4535 4536 // check libawt_xawt.so 4537 strcpy(libmawtpath, buf); 4538 strcat(libmawtpath, new_xawtstr); 4539 if (::stat(libmawtpath, &statbuf) == 0) return false; 4540 4541 return true; 4542} 4543 4544// Get the default path to the core file 4545// Returns the length of the string 4546int os::get_core_path(char* buffer, size_t bufferSize) { 4547 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4548 4549 // Truncate if theoretical string was longer than bufferSize 4550 n = MIN2(n, (int)bufferSize); 4551 4552 return n; 4553} 4554