os_bsd.cpp revision 4802:f2110083203d
1284345Ssjg/* 2284345Ssjg * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3284345Ssjg * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4284345Ssjg * 5284345Ssjg * This code is free software; you can redistribute it and/or modify it 6284345Ssjg * under the terms of the GNU General Public License version 2 only, as 7284345Ssjg * published by the Free Software Foundation. 8284345Ssjg * 9284345Ssjg * This code is distributed in the hope that it will be useful, but WITHOUT 10284345Ssjg * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11284345Ssjg * 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 628 629// check if it's safe to start a new thread 630static bool _thread_safety_check(Thread* thread) { 631 return true; 632} 633 634#ifdef __APPLE__ 635// library handle for calling objc_registerThreadWithCollector() 636// without static linking to the libobjc library 637#define OBJC_LIB "/usr/lib/libobjc.dylib" 638#define OBJC_GCREGISTER "objc_registerThreadWithCollector" 639typedef void (*objc_registerThreadWithCollector_t)(); 640extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 641objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 642#endif 643 644#ifdef __APPLE__ 645static uint64_t locate_unique_thread_id() { 646 // Additional thread_id used to correlate threads in SA 647 thread_identifier_info_data_t m_ident_info; 648 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 649 650 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, 651 (thread_info_t) &m_ident_info, &count); 652 return m_ident_info.thread_id; 653} 654#endif 655 656// Thread start routine for all newly created threads 657static void *java_start(Thread *thread) { 658 // Try to randomize the cache line index of hot stack frames. 659 // This helps when threads of the same stack traces evict each other's 660 // cache lines. The threads can be either from the same JVM instance, or 661 // from different JVM instances. The benefit is especially true for 662 // processors with hyperthreading technology. 663 static int counter = 0; 664 int pid = os::current_process_id(); 665 alloca(((pid ^ counter++) & 7) * 128); 666 667 ThreadLocalStorage::set_thread(thread); 668 669 OSThread* osthread = thread->osthread(); 670 Monitor* sync = osthread->startThread_lock(); 671 672 // non floating stack BsdThreads needs extra check, see above 673 if (!_thread_safety_check(thread)) { 674 // notify parent thread 675 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 676 osthread->set_state(ZOMBIE); 677 sync->notify_all(); 678 return NULL; 679 } 680 681#ifdef __APPLE__ 682 // thread_id is mach thread on macos 683 osthread->set_thread_id(::mach_thread_self()); 684 osthread->set_unique_thread_id(locate_unique_thread_id()); 685#else 686 // thread_id is pthread_id on BSD 687 osthread->set_thread_id(::pthread_self()); 688#endif 689 // initialize signal mask for this thread 690 os::Bsd::hotspot_sigmask(thread); 691 692 // initialize floating point control register 693 os::Bsd::init_thread_fpu_state(); 694 695#ifdef __APPLE__ 696 // register thread with objc gc 697 if (objc_registerThreadWithCollectorFunction != NULL) { 698 objc_registerThreadWithCollectorFunction(); 699 } 700#endif 701 702 // handshaking with parent thread 703 { 704 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 705 706 // notify parent thread 707 osthread->set_state(INITIALIZED); 708 sync->notify_all(); 709 710 // wait until os::start_thread() 711 while (osthread->get_state() == INITIALIZED) { 712 sync->wait(Mutex::_no_safepoint_check_flag); 713 } 714 } 715 716 // call one more level start routine 717 thread->run(); 718 719 return 0; 720} 721 722bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 723 assert(thread->osthread() == NULL, "caller responsible"); 724 725 // Allocate the OSThread object 726 OSThread* osthread = new OSThread(NULL, NULL); 727 if (osthread == NULL) { 728 return false; 729 } 730 731 // set the correct thread state 732 osthread->set_thread_type(thr_type); 733 734 // Initial state is ALLOCATED but not INITIALIZED 735 osthread->set_state(ALLOCATED); 736 737 thread->set_osthread(osthread); 738 739 // init thread attributes 740 pthread_attr_t attr; 741 pthread_attr_init(&attr); 742 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 743 744 // stack size 745 if (os::Bsd::supports_variable_stack_size()) { 746 // calculate stack size if it's not specified by caller 747 if (stack_size == 0) { 748 stack_size = os::Bsd::default_stack_size(thr_type); 749 750 switch (thr_type) { 751 case os::java_thread: 752 // Java threads use ThreadStackSize which default value can be 753 // changed with the flag -Xss 754 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 755 stack_size = JavaThread::stack_size_at_create(); 756 break; 757 case os::compiler_thread: 758 if (CompilerThreadStackSize > 0) { 759 stack_size = (size_t)(CompilerThreadStackSize * K); 760 break; 761 } // else fall through: 762 // use VMThreadStackSize if CompilerThreadStackSize is not defined 763 case os::vm_thread: 764 case os::pgc_thread: 765 case os::cgc_thread: 766 case os::watcher_thread: 767 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 768 break; 769 } 770 } 771 772 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 773 pthread_attr_setstacksize(&attr, stack_size); 774 } else { 775 // let pthread_create() pick the default value. 776 } 777 778 ThreadState state; 779 780 { 781 pthread_t tid; 782 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 783 784 pthread_attr_destroy(&attr); 785 786 if (ret != 0) { 787 if (PrintMiscellaneous && (Verbose || WizardMode)) { 788 perror("pthread_create()"); 789 } 790 // Need to clean up stuff we've allocated so far 791 thread->set_osthread(NULL); 792 delete osthread; 793 return false; 794 } 795 796 // Store pthread info into the OSThread 797 osthread->set_pthread_id(tid); 798 799 // Wait until child thread is either initialized or aborted 800 { 801 Monitor* sync_with_child = osthread->startThread_lock(); 802 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 803 while ((state = osthread->get_state()) == ALLOCATED) { 804 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 805 } 806 } 807 808 } 809 810 // Aborted due to thread limit being reached 811 if (state == ZOMBIE) { 812 thread->set_osthread(NULL); 813 delete osthread; 814 return false; 815 } 816 817 // The thread is returned suspended (in state INITIALIZED), 818 // and is started higher up in the call chain 819 assert(state == INITIALIZED, "race condition"); 820 return true; 821} 822 823///////////////////////////////////////////////////////////////////////////// 824// attach existing thread 825 826// bootstrap the main thread 827bool os::create_main_thread(JavaThread* thread) { 828 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 829 return create_attached_thread(thread); 830} 831 832bool os::create_attached_thread(JavaThread* thread) { 833#ifdef ASSERT 834 thread->verify_not_published(); 835#endif 836 837 // Allocate the OSThread object 838 OSThread* osthread = new OSThread(NULL, NULL); 839 840 if (osthread == NULL) { 841 return false; 842 } 843 844 // Store pthread info into the OSThread 845#ifdef __APPLE__ 846 osthread->set_thread_id(::mach_thread_self()); 847 osthread->set_unique_thread_id(locate_unique_thread_id()); 848#else 849 osthread->set_thread_id(::pthread_self()); 850#endif 851 osthread->set_pthread_id(::pthread_self()); 852 853 // initialize floating point control register 854 os::Bsd::init_thread_fpu_state(); 855 856 // Initial thread state is RUNNABLE 857 osthread->set_state(RUNNABLE); 858 859 thread->set_osthread(osthread); 860 861 // initialize signal mask for this thread 862 // and save the caller's signal mask 863 os::Bsd::hotspot_sigmask(thread); 864 865 return true; 866} 867 868void os::pd_start_thread(Thread* thread) { 869 OSThread * osthread = thread->osthread(); 870 assert(osthread->get_state() != INITIALIZED, "just checking"); 871 Monitor* sync_with_child = osthread->startThread_lock(); 872 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 873 sync_with_child->notify(); 874} 875 876// Free Bsd resources related to the OSThread 877void os::free_thread(OSThread* osthread) { 878 assert(osthread != NULL, "osthread not set"); 879 880 if (Thread::current()->osthread() == osthread) { 881 // Restore caller's signal mask 882 sigset_t sigmask = osthread->caller_sigmask(); 883 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 884 } 885 886 delete osthread; 887} 888 889////////////////////////////////////////////////////////////////////////////// 890// thread local storage 891 892int os::allocate_thread_local_storage() { 893 pthread_key_t key; 894 int rslt = pthread_key_create(&key, NULL); 895 assert(rslt == 0, "cannot allocate thread local storage"); 896 return (int)key; 897} 898 899// Note: This is currently not used by VM, as we don't destroy TLS key 900// on VM exit. 901void os::free_thread_local_storage(int index) { 902 int rslt = pthread_key_delete((pthread_key_t)index); 903 assert(rslt == 0, "invalid index"); 904} 905 906void os::thread_local_storage_at_put(int index, void* value) { 907 int rslt = pthread_setspecific((pthread_key_t)index, value); 908 assert(rslt == 0, "pthread_setspecific failed"); 909} 910 911extern "C" Thread* get_thread() { 912 return ThreadLocalStorage::thread(); 913} 914 915 916//////////////////////////////////////////////////////////////////////////////// 917// time support 918 919// Time since start-up in seconds to a fine granularity. 920// Used by VMSelfDestructTimer and the MemProfiler. 921double os::elapsedTime() { 922 923 return (double)(os::elapsed_counter()) * 0.000001; 924} 925 926jlong os::elapsed_counter() { 927 timeval time; 928 int status = gettimeofday(&time, NULL); 929 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 930} 931 932jlong os::elapsed_frequency() { 933 return (1000 * 1000); 934} 935 936bool os::supports_vtime() { return true; } 937bool os::enable_vtime() { return false; } 938bool os::vtime_enabled() { return false; } 939 940double os::elapsedVTime() { 941 // better than nothing, but not much 942 return elapsedTime(); 943} 944 945jlong os::javaTimeMillis() { 946 timeval time; 947 int status = gettimeofday(&time, NULL); 948 assert(status != -1, "bsd error"); 949 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 950} 951 952#ifndef CLOCK_MONOTONIC 953#define CLOCK_MONOTONIC (1) 954#endif 955 956#ifdef __APPLE__ 957void os::Bsd::clock_init() { 958 // XXXDARWIN: Investigate replacement monotonic clock 959} 960#else 961void os::Bsd::clock_init() { 962 struct timespec res; 963 struct timespec tp; 964 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 965 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 966 // yes, monotonic clock is supported 967 _clock_gettime = ::clock_gettime; 968 } 969} 970#endif 971 972 973jlong os::javaTimeNanos() { 974 if (Bsd::supports_monotonic_clock()) { 975 struct timespec tp; 976 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 977 assert(status == 0, "gettime error"); 978 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 979 return result; 980 } else { 981 timeval time; 982 int status = gettimeofday(&time, NULL); 983 assert(status != -1, "bsd error"); 984 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 985 return 1000 * usecs; 986 } 987} 988 989void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 990 if (Bsd::supports_monotonic_clock()) { 991 info_ptr->max_value = ALL_64_BITS; 992 993 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 994 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 995 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 996 } else { 997 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 998 info_ptr->max_value = ALL_64_BITS; 999 1000 // gettimeofday is a real time clock so it skips 1001 info_ptr->may_skip_backward = true; 1002 info_ptr->may_skip_forward = true; 1003 } 1004 1005 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1006} 1007 1008// Return the real, user, and system times in seconds from an 1009// arbitrary fixed point in the past. 1010bool os::getTimesSecs(double* process_real_time, 1011 double* process_user_time, 1012 double* process_system_time) { 1013 struct tms ticks; 1014 clock_t real_ticks = times(&ticks); 1015 1016 if (real_ticks == (clock_t) (-1)) { 1017 return false; 1018 } else { 1019 double ticks_per_second = (double) clock_tics_per_sec; 1020 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1021 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1022 *process_real_time = ((double) real_ticks) / ticks_per_second; 1023 1024 return true; 1025 } 1026} 1027 1028 1029char * os::local_time_string(char *buf, size_t buflen) { 1030 struct tm t; 1031 time_t long_time; 1032 time(&long_time); 1033 localtime_r(&long_time, &t); 1034 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1035 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1036 t.tm_hour, t.tm_min, t.tm_sec); 1037 return buf; 1038} 1039 1040struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1041 return localtime_r(clock, res); 1042} 1043 1044//////////////////////////////////////////////////////////////////////////////// 1045// runtime exit support 1046 1047// Note: os::shutdown() might be called very early during initialization, or 1048// called from signal handler. Before adding something to os::shutdown(), make 1049// sure it is async-safe and can handle partially initialized VM. 1050void os::shutdown() { 1051 1052 // allow PerfMemory to attempt cleanup of any persistent resources 1053 perfMemory_exit(); 1054 1055 // needs to remove object in file system 1056 AttachListener::abort(); 1057 1058 // flush buffered output, finish log files 1059 ostream_abort(); 1060 1061 // Check for abort hook 1062 abort_hook_t abort_hook = Arguments::abort_hook(); 1063 if (abort_hook != NULL) { 1064 abort_hook(); 1065 } 1066 1067} 1068 1069// Note: os::abort() might be called very early during initialization, or 1070// called from signal handler. Before adding something to os::abort(), make 1071// sure it is async-safe and can handle partially initialized VM. 1072void os::abort(bool dump_core) { 1073 os::shutdown(); 1074 if (dump_core) { 1075#ifndef PRODUCT 1076 fdStream out(defaultStream::output_fd()); 1077 out.print_raw("Current thread is "); 1078 char buf[16]; 1079 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1080 out.print_raw_cr(buf); 1081 out.print_raw_cr("Dumping core ..."); 1082#endif 1083 ::abort(); // dump core 1084 } 1085 1086 ::exit(1); 1087} 1088 1089// Die immediately, no exit hook, no abort hook, no cleanup. 1090void os::die() { 1091 // _exit() on BsdThreads only kills current thread 1092 ::abort(); 1093} 1094 1095// unused on bsd for now. 1096void os::set_error_file(const char *logfile) {} 1097 1098 1099// This method is a copy of JDK's sysGetLastErrorString 1100// from src/solaris/hpi/src/system_md.c 1101 1102size_t os::lasterror(char *buf, size_t len) { 1103 1104 if (errno == 0) return 0; 1105 1106 const char *s = ::strerror(errno); 1107 size_t n = ::strlen(s); 1108 if (n >= len) { 1109 n = len - 1; 1110 } 1111 ::strncpy(buf, s, n); 1112 buf[n] = '\0'; 1113 return n; 1114} 1115 1116intx os::current_thread_id() { 1117#ifdef __APPLE__ 1118 return (intx)::mach_thread_self(); 1119#else 1120 return (intx)::pthread_self(); 1121#endif 1122} 1123int os::current_process_id() { 1124 1125 // Under the old bsd thread library, bsd gives each thread 1126 // its own process id. Because of this each thread will return 1127 // a different pid if this method were to return the result 1128 // of getpid(2). Bsd provides no api that returns the pid 1129 // of the launcher thread for the vm. This implementation 1130 // returns a unique pid, the pid of the launcher thread 1131 // that starts the vm 'process'. 1132 1133 // Under the NPTL, getpid() returns the same pid as the 1134 // launcher thread rather than a unique pid per thread. 1135 // Use gettid() if you want the old pre NPTL behaviour. 1136 1137 // if you are looking for the result of a call to getpid() that 1138 // returns a unique pid for the calling thread, then look at the 1139 // OSThread::thread_id() method in osThread_bsd.hpp file 1140 1141 return (int)(_initial_pid ? _initial_pid : getpid()); 1142} 1143 1144// DLL functions 1145 1146#define JNI_LIB_PREFIX "lib" 1147#ifdef __APPLE__ 1148#define JNI_LIB_SUFFIX ".dylib" 1149#else 1150#define JNI_LIB_SUFFIX ".so" 1151#endif 1152 1153const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1154 1155// This must be hard coded because it's the system's temporary 1156// directory not the java application's temp directory, ala java.io.tmpdir. 1157#ifdef __APPLE__ 1158// macosx has a secure per-user temporary directory 1159char temp_path_storage[PATH_MAX]; 1160const char* os::get_temp_directory() { 1161 static char *temp_path = NULL; 1162 if (temp_path == NULL) { 1163 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1164 if (pathSize == 0 || pathSize > PATH_MAX) { 1165 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1166 } 1167 temp_path = temp_path_storage; 1168 } 1169 return temp_path; 1170} 1171#else /* __APPLE__ */ 1172const char* os::get_temp_directory() { return "/tmp"; } 1173#endif /* __APPLE__ */ 1174 1175static bool file_exists(const char* filename) { 1176 struct stat statbuf; 1177 if (filename == NULL || strlen(filename) == 0) { 1178 return false; 1179 } 1180 return os::stat(filename, &statbuf) == 0; 1181} 1182 1183bool os::dll_build_name(char* buffer, size_t buflen, 1184 const char* pname, const char* fname) { 1185 bool retval = false; 1186 // Copied from libhpi 1187 const size_t pnamelen = pname ? strlen(pname) : 0; 1188 1189 // Return error on buffer overflow. 1190 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1191 return retval; 1192 } 1193 1194 if (pnamelen == 0) { 1195 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1196 retval = true; 1197 } else if (strchr(pname, *os::path_separator()) != NULL) { 1198 int n; 1199 char** pelements = split_path(pname, &n); 1200 if (pelements == NULL) { 1201 return false; 1202 } 1203 for (int i = 0 ; i < n ; i++) { 1204 // Really shouldn't be NULL, but check can't hurt 1205 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1206 continue; // skip the empty path values 1207 } 1208 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1209 pelements[i], fname); 1210 if (file_exists(buffer)) { 1211 retval = true; 1212 break; 1213 } 1214 } 1215 // release the storage 1216 for (int i = 0 ; i < n ; i++) { 1217 if (pelements[i] != NULL) { 1218 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1219 } 1220 } 1221 if (pelements != NULL) { 1222 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1223 } 1224 } else { 1225 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1226 retval = true; 1227 } 1228 return retval; 1229} 1230 1231// check if addr is inside libjvm.so 1232bool os::address_is_in_vm(address addr) { 1233 static address libjvm_base_addr; 1234 Dl_info dlinfo; 1235 1236 if (libjvm_base_addr == NULL) { 1237 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1238 libjvm_base_addr = (address)dlinfo.dli_fbase; 1239 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1240 } 1241 1242 if (dladdr((void *)addr, &dlinfo)) { 1243 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1244 } 1245 1246 return false; 1247} 1248 1249 1250#define MACH_MAXSYMLEN 256 1251 1252bool os::dll_address_to_function_name(address addr, char *buf, 1253 int buflen, int *offset) { 1254 Dl_info dlinfo; 1255 char localbuf[MACH_MAXSYMLEN]; 1256 1257 // dladdr will find names of dynamic functions only, but does 1258 // it set dli_fbase with mach_header address when it "fails" ? 1259 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1260 if (buf != NULL) { 1261 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1262 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1263 } 1264 } 1265 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1266 return true; 1267 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1269 buf, buflen, offset, dlinfo.dli_fname)) { 1270 return true; 1271 } 1272 } 1273 1274 // Handle non-dymanic manually: 1275 if (dlinfo.dli_fbase != NULL && 1276 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { 1277 if(!Decoder::demangle(localbuf, buf, buflen)) { 1278 jio_snprintf(buf, buflen, "%s", localbuf); 1279 } 1280 return true; 1281 } 1282 if (buf != NULL) buf[0] = '\0'; 1283 if (offset != NULL) *offset = -1; 1284 return false; 1285} 1286 1287// ported from solaris version 1288bool os::dll_address_to_library_name(address addr, char* buf, 1289 int buflen, int* offset) { 1290 Dl_info dlinfo; 1291 1292 if (dladdr((void*)addr, &dlinfo)){ 1293 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1294 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1295 return true; 1296 } else { 1297 if (buf) buf[0] = '\0'; 1298 if (offset) *offset = -1; 1299 return false; 1300 } 1301} 1302 1303// Loads .dll/.so and 1304// in case of error it checks if .dll/.so was built for the 1305// same architecture as Hotspot is running on 1306 1307#ifdef __APPLE__ 1308void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1309 void * result= ::dlopen(filename, RTLD_LAZY); 1310 if (result != NULL) { 1311 // Successful loading 1312 return result; 1313 } 1314 1315 // Read system error message into ebuf 1316 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1317 ebuf[ebuflen-1]='\0'; 1318 1319 return NULL; 1320} 1321#else 1322void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1323{ 1324 void * result= ::dlopen(filename, RTLD_LAZY); 1325 if (result != NULL) { 1326 // Successful loading 1327 return result; 1328 } 1329 1330 Elf32_Ehdr elf_head; 1331 1332 // Read system error message into ebuf 1333 // It may or may not be overwritten below 1334 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1335 ebuf[ebuflen-1]='\0'; 1336 int diag_msg_max_length=ebuflen-strlen(ebuf); 1337 char* diag_msg_buf=ebuf+strlen(ebuf); 1338 1339 if (diag_msg_max_length==0) { 1340 // No more space in ebuf for additional diagnostics message 1341 return NULL; 1342 } 1343 1344 1345 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1346 1347 if (file_descriptor < 0) { 1348 // Can't open library, report dlerror() message 1349 return NULL; 1350 } 1351 1352 bool failed_to_read_elf_head= 1353 (sizeof(elf_head)!= 1354 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1355 1356 ::close(file_descriptor); 1357 if (failed_to_read_elf_head) { 1358 // file i/o error - report dlerror() msg 1359 return NULL; 1360 } 1361 1362 typedef struct { 1363 Elf32_Half code; // Actual value as defined in elf.h 1364 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1365 char elf_class; // 32 or 64 bit 1366 char endianess; // MSB or LSB 1367 char* name; // String representation 1368 } arch_t; 1369 1370 #ifndef EM_486 1371 #define EM_486 6 /* Intel 80486 */ 1372 #endif 1373 1374 #ifndef EM_MIPS_RS3_LE 1375 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1376 #endif 1377 1378 #ifndef EM_PPC64 1379 #define EM_PPC64 21 /* PowerPC64 */ 1380 #endif 1381 1382 #ifndef EM_S390 1383 #define EM_S390 22 /* IBM System/390 */ 1384 #endif 1385 1386 #ifndef EM_IA_64 1387 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1388 #endif 1389 1390 #ifndef EM_X86_64 1391 #define EM_X86_64 62 /* AMD x86-64 */ 1392 #endif 1393 1394 static const arch_t arch_array[]={ 1395 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1396 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1397 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1398 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1399 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1400 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1401 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1402 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1403 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1404 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1405 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1406 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1407 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1408 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1409 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1410 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1411 }; 1412 1413 #if (defined IA32) 1414 static Elf32_Half running_arch_code=EM_386; 1415 #elif (defined AMD64) 1416 static Elf32_Half running_arch_code=EM_X86_64; 1417 #elif (defined IA64) 1418 static Elf32_Half running_arch_code=EM_IA_64; 1419 #elif (defined __sparc) && (defined _LP64) 1420 static Elf32_Half running_arch_code=EM_SPARCV9; 1421 #elif (defined __sparc) && (!defined _LP64) 1422 static Elf32_Half running_arch_code=EM_SPARC; 1423 #elif (defined __powerpc64__) 1424 static Elf32_Half running_arch_code=EM_PPC64; 1425 #elif (defined __powerpc__) 1426 static Elf32_Half running_arch_code=EM_PPC; 1427 #elif (defined ARM) 1428 static Elf32_Half running_arch_code=EM_ARM; 1429 #elif (defined S390) 1430 static Elf32_Half running_arch_code=EM_S390; 1431 #elif (defined ALPHA) 1432 static Elf32_Half running_arch_code=EM_ALPHA; 1433 #elif (defined MIPSEL) 1434 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1435 #elif (defined PARISC) 1436 static Elf32_Half running_arch_code=EM_PARISC; 1437 #elif (defined MIPS) 1438 static Elf32_Half running_arch_code=EM_MIPS; 1439 #elif (defined M68K) 1440 static Elf32_Half running_arch_code=EM_68K; 1441 #else 1442 #error Method os::dll_load requires that one of following is defined:\ 1443 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1444 #endif 1445 1446 // Identify compatability class for VM's architecture and library's architecture 1447 // Obtain string descriptions for architectures 1448 1449 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1450 int running_arch_index=-1; 1451 1452 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1453 if (running_arch_code == arch_array[i].code) { 1454 running_arch_index = i; 1455 } 1456 if (lib_arch.code == arch_array[i].code) { 1457 lib_arch.compat_class = arch_array[i].compat_class; 1458 lib_arch.name = arch_array[i].name; 1459 } 1460 } 1461 1462 assert(running_arch_index != -1, 1463 "Didn't find running architecture code (running_arch_code) in arch_array"); 1464 if (running_arch_index == -1) { 1465 // Even though running architecture detection failed 1466 // we may still continue with reporting dlerror() message 1467 return NULL; 1468 } 1469 1470 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1471 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1472 return NULL; 1473 } 1474 1475#ifndef S390 1476 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1477 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1478 return NULL; 1479 } 1480#endif // !S390 1481 1482 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1483 if ( lib_arch.name!=NULL ) { 1484 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1485 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1486 lib_arch.name, arch_array[running_arch_index].name); 1487 } else { 1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1489 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1490 lib_arch.code, 1491 arch_array[running_arch_index].name); 1492 } 1493 } 1494 1495 return NULL; 1496} 1497#endif /* !__APPLE__ */ 1498 1499// XXX: Do we need a lock around this as per Linux? 1500void* os::dll_lookup(void* handle, const char* name) { 1501 return dlsym(handle, name); 1502} 1503 1504 1505static bool _print_ascii_file(const char* filename, outputStream* st) { 1506 int fd = ::open(filename, O_RDONLY); 1507 if (fd == -1) { 1508 return false; 1509 } 1510 1511 char buf[32]; 1512 int bytes; 1513 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1514 st->print_raw(buf, bytes); 1515 } 1516 1517 ::close(fd); 1518 1519 return true; 1520} 1521 1522void os::print_dll_info(outputStream *st) { 1523 st->print_cr("Dynamic libraries:"); 1524#ifdef RTLD_DI_LINKMAP 1525 Dl_info dli; 1526 void *handle; 1527 Link_map *map; 1528 Link_map *p; 1529 1530 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1531 st->print_cr("Error: Cannot print dynamic libraries."); 1532 return; 1533 } 1534 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1535 if (handle == NULL) { 1536 st->print_cr("Error: Cannot print dynamic libraries."); 1537 return; 1538 } 1539 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1540 if (map == NULL) { 1541 st->print_cr("Error: Cannot print dynamic libraries."); 1542 return; 1543 } 1544 1545 while (map->l_prev != NULL) 1546 map = map->l_prev; 1547 1548 while (map != NULL) { 1549 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1550 map = map->l_next; 1551 } 1552 1553 dlclose(handle); 1554#elif defined(__APPLE__) 1555 uint32_t count; 1556 uint32_t i; 1557 1558 count = _dyld_image_count(); 1559 for (i = 1; i < count; i++) { 1560 const char *name = _dyld_get_image_name(i); 1561 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1562 st->print_cr(PTR_FORMAT " \t%s", slide, name); 1563 } 1564#else 1565 st->print_cr("Error: Cannot print dynamic libraries."); 1566#endif 1567} 1568 1569void os::print_os_info_brief(outputStream* st) { 1570 st->print("Bsd"); 1571 1572 os::Posix::print_uname_info(st); 1573} 1574 1575void os::print_os_info(outputStream* st) { 1576 st->print("OS:"); 1577 st->print("Bsd"); 1578 1579 os::Posix::print_uname_info(st); 1580 1581 os::Posix::print_rlimit_info(st); 1582 1583 os::Posix::print_load_average(st); 1584} 1585 1586void os::pd_print_cpu_info(outputStream* st) { 1587 // Nothing to do for now. 1588} 1589 1590void os::print_memory_info(outputStream* st) { 1591 1592 st->print("Memory:"); 1593 st->print(" %dk page", os::vm_page_size()>>10); 1594 1595 st->print(", physical " UINT64_FORMAT "k", 1596 os::physical_memory() >> 10); 1597 st->print("(" UINT64_FORMAT "k free)", 1598 os::available_memory() >> 10); 1599 st->cr(); 1600 1601 // meminfo 1602 st->print("\n/proc/meminfo:\n"); 1603 _print_ascii_file("/proc/meminfo", st); 1604 st->cr(); 1605} 1606 1607// Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1608// but they're the same for all the bsd arch that we support 1609// and they're the same for solaris but there's no common place to put this. 1610const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1611 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1612 "ILL_COPROC", "ILL_BADSTK" }; 1613 1614const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1615 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1616 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1617 1618const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1619 1620const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1621 1622void os::print_siginfo(outputStream* st, void* siginfo) { 1623 st->print("siginfo:"); 1624 1625 const int buflen = 100; 1626 char buf[buflen]; 1627 siginfo_t *si = (siginfo_t*)siginfo; 1628 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1629 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1630 st->print("si_errno=%s", buf); 1631 } else { 1632 st->print("si_errno=%d", si->si_errno); 1633 } 1634 const int c = si->si_code; 1635 assert(c > 0, "unexpected si_code"); 1636 switch (si->si_signo) { 1637 case SIGILL: 1638 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1639 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1640 break; 1641 case SIGFPE: 1642 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1643 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1644 break; 1645 case SIGSEGV: 1646 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1647 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1648 break; 1649 case SIGBUS: 1650 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1651 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1652 break; 1653 default: 1654 st->print(", si_code=%d", si->si_code); 1655 // no si_addr 1656 } 1657 1658 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1659 UseSharedSpaces) { 1660 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1661 if (mapinfo->is_in_shared_space(si->si_addr)) { 1662 st->print("\n\nError accessing class data sharing archive." \ 1663 " Mapped file inaccessible during execution, " \ 1664 " possible disk/network problem."); 1665 } 1666 } 1667 st->cr(); 1668} 1669 1670 1671static void print_signal_handler(outputStream* st, int sig, 1672 char* buf, size_t buflen); 1673 1674void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1675 st->print_cr("Signal Handlers:"); 1676 print_signal_handler(st, SIGSEGV, buf, buflen); 1677 print_signal_handler(st, SIGBUS , buf, buflen); 1678 print_signal_handler(st, SIGFPE , buf, buflen); 1679 print_signal_handler(st, SIGPIPE, buf, buflen); 1680 print_signal_handler(st, SIGXFSZ, buf, buflen); 1681 print_signal_handler(st, SIGILL , buf, buflen); 1682 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1683 print_signal_handler(st, SR_signum, buf, buflen); 1684 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1685 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1686 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1687 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1688} 1689 1690static char saved_jvm_path[MAXPATHLEN] = {0}; 1691 1692// Find the full path to the current module, libjvm 1693void os::jvm_path(char *buf, jint buflen) { 1694 // Error checking. 1695 if (buflen < MAXPATHLEN) { 1696 assert(false, "must use a large-enough buffer"); 1697 buf[0] = '\0'; 1698 return; 1699 } 1700 // Lazy resolve the path to current module. 1701 if (saved_jvm_path[0] != 0) { 1702 strcpy(buf, saved_jvm_path); 1703 return; 1704 } 1705 1706 char dli_fname[MAXPATHLEN]; 1707 bool ret = dll_address_to_library_name( 1708 CAST_FROM_FN_PTR(address, os::jvm_path), 1709 dli_fname, sizeof(dli_fname), NULL); 1710 assert(ret != 0, "cannot locate libjvm"); 1711 char *rp = realpath(dli_fname, buf); 1712 if (rp == NULL) 1713 return; 1714 1715 if (Arguments::created_by_gamma_launcher()) { 1716 // Support for the gamma launcher. Typical value for buf is 1717 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1718 // the right place in the string, then assume we are installed in a JDK and 1719 // we're done. Otherwise, check for a JAVA_HOME environment variable and 1720 // construct a path to the JVM being overridden. 1721 1722 const char *p = buf + strlen(buf) - 1; 1723 for (int count = 0; p > buf && count < 5; ++count) { 1724 for (--p; p > buf && *p != '/'; --p) 1725 /* empty */ ; 1726 } 1727 1728 if (strncmp(p, "/jre/lib/", 9) != 0) { 1729 // Look for JAVA_HOME in the environment. 1730 char* java_home_var = ::getenv("JAVA_HOME"); 1731 if (java_home_var != NULL && java_home_var[0] != 0) { 1732 char* jrelib_p; 1733 int len; 1734 1735 // Check the current module name "libjvm" 1736 p = strrchr(buf, '/'); 1737 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1738 1739 rp = realpath(java_home_var, buf); 1740 if (rp == NULL) 1741 return; 1742 1743 // determine if this is a legacy image or modules image 1744 // modules image doesn't have "jre" subdirectory 1745 len = strlen(buf); 1746 jrelib_p = buf + len; 1747 1748 // Add the appropriate library subdir 1749 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1750 if (0 != access(buf, F_OK)) { 1751 snprintf(jrelib_p, buflen-len, "/lib"); 1752 } 1753 1754 // Add the appropriate client or server subdir 1755 len = strlen(buf); 1756 jrelib_p = buf + len; 1757 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1758 if (0 != access(buf, F_OK)) { 1759 snprintf(jrelib_p, buflen-len, ""); 1760 } 1761 1762 // If the path exists within JAVA_HOME, add the JVM library name 1763 // to complete the path to JVM being overridden. Otherwise fallback 1764 // to the path to the current library. 1765 if (0 == access(buf, F_OK)) { 1766 // Use current module name "libjvm" 1767 len = strlen(buf); 1768 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1769 } else { 1770 // Fall back to path of current library 1771 rp = realpath(dli_fname, buf); 1772 if (rp == NULL) 1773 return; 1774 } 1775 } 1776 } 1777 } 1778 1779 strcpy(saved_jvm_path, buf); 1780} 1781 1782void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1783 // no prefix required, not even "_" 1784} 1785 1786void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1787 // no suffix required 1788} 1789 1790//////////////////////////////////////////////////////////////////////////////// 1791// sun.misc.Signal support 1792 1793static volatile jint sigint_count = 0; 1794 1795static void 1796UserHandler(int sig, void *siginfo, void *context) { 1797 // 4511530 - sem_post is serialized and handled by the manager thread. When 1798 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1799 // don't want to flood the manager thread with sem_post requests. 1800 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1801 return; 1802 1803 // Ctrl-C is pressed during error reporting, likely because the error 1804 // handler fails to abort. Let VM die immediately. 1805 if (sig == SIGINT && is_error_reported()) { 1806 os::die(); 1807 } 1808 1809 os::signal_notify(sig); 1810} 1811 1812void* os::user_handler() { 1813 return CAST_FROM_FN_PTR(void*, UserHandler); 1814} 1815 1816extern "C" { 1817 typedef void (*sa_handler_t)(int); 1818 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1819} 1820 1821void* os::signal(int signal_number, void* handler) { 1822 struct sigaction sigAct, oldSigAct; 1823 1824 sigfillset(&(sigAct.sa_mask)); 1825 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1826 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1827 1828 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1829 // -1 means registration failed 1830 return (void *)-1; 1831 } 1832 1833 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1834} 1835 1836void os::signal_raise(int signal_number) { 1837 ::raise(signal_number); 1838} 1839 1840/* 1841 * The following code is moved from os.cpp for making this 1842 * code platform specific, which it is by its very nature. 1843 */ 1844 1845// Will be modified when max signal is changed to be dynamic 1846int os::sigexitnum_pd() { 1847 return NSIG; 1848} 1849 1850// a counter for each possible signal value 1851static volatile jint pending_signals[NSIG+1] = { 0 }; 1852 1853// Bsd(POSIX) specific hand shaking semaphore. 1854#ifdef __APPLE__ 1855typedef semaphore_t os_semaphore_t; 1856#define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1857#define SEM_WAIT(sem) semaphore_wait(sem) 1858#define SEM_POST(sem) semaphore_signal(sem) 1859#define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1860#else 1861typedef sem_t os_semaphore_t; 1862#define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1863#define SEM_WAIT(sem) sem_wait(&sem) 1864#define SEM_POST(sem) sem_post(&sem) 1865#define SEM_DESTROY(sem) sem_destroy(&sem) 1866#endif 1867 1868class Semaphore : public StackObj { 1869 public: 1870 Semaphore(); 1871 ~Semaphore(); 1872 void signal(); 1873 void wait(); 1874 bool trywait(); 1875 bool timedwait(unsigned int sec, int nsec); 1876 private: 1877 jlong currenttime() const; 1878 semaphore_t _semaphore; 1879}; 1880 1881Semaphore::Semaphore() : _semaphore(0) { 1882 SEM_INIT(_semaphore, 0); 1883} 1884 1885Semaphore::~Semaphore() { 1886 SEM_DESTROY(_semaphore); 1887} 1888 1889void Semaphore::signal() { 1890 SEM_POST(_semaphore); 1891} 1892 1893void Semaphore::wait() { 1894 SEM_WAIT(_semaphore); 1895} 1896 1897jlong Semaphore::currenttime() const { 1898 struct timeval tv; 1899 gettimeofday(&tv, NULL); 1900 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1901} 1902 1903#ifdef __APPLE__ 1904bool Semaphore::trywait() { 1905 return timedwait(0, 0); 1906} 1907 1908bool Semaphore::timedwait(unsigned int sec, int nsec) { 1909 kern_return_t kr = KERN_ABORTED; 1910 mach_timespec_t waitspec; 1911 waitspec.tv_sec = sec; 1912 waitspec.tv_nsec = nsec; 1913 1914 jlong starttime = currenttime(); 1915 1916 kr = semaphore_timedwait(_semaphore, waitspec); 1917 while (kr == KERN_ABORTED) { 1918 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1919 1920 jlong current = currenttime(); 1921 jlong passedtime = current - starttime; 1922 1923 if (passedtime >= totalwait) { 1924 waitspec.tv_sec = 0; 1925 waitspec.tv_nsec = 0; 1926 } else { 1927 jlong waittime = totalwait - (current - starttime); 1928 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1929 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1930 } 1931 1932 kr = semaphore_timedwait(_semaphore, waitspec); 1933 } 1934 1935 return kr == KERN_SUCCESS; 1936} 1937 1938#else 1939 1940bool Semaphore::trywait() { 1941 return sem_trywait(&_semaphore) == 0; 1942} 1943 1944bool Semaphore::timedwait(unsigned int sec, int nsec) { 1945 struct timespec ts; 1946 jlong endtime = unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 1947 1948 while (1) { 1949 int result = sem_timedwait(&_semaphore, &ts); 1950 if (result == 0) { 1951 return true; 1952 } else if (errno == EINTR) { 1953 continue; 1954 } else if (errno == ETIMEDOUT) { 1955 return false; 1956 } else { 1957 return false; 1958 } 1959 } 1960} 1961 1962#endif // __APPLE__ 1963 1964static os_semaphore_t sig_sem; 1965static Semaphore sr_semaphore; 1966 1967void os::signal_init_pd() { 1968 // Initialize signal structures 1969 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1970 1971 // Initialize signal semaphore 1972 ::SEM_INIT(sig_sem, 0); 1973} 1974 1975void os::signal_notify(int sig) { 1976 Atomic::inc(&pending_signals[sig]); 1977 ::SEM_POST(sig_sem); 1978} 1979 1980static int check_pending_signals(bool wait) { 1981 Atomic::store(0, &sigint_count); 1982 for (;;) { 1983 for (int i = 0; i < NSIG + 1; i++) { 1984 jint n = pending_signals[i]; 1985 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1986 return i; 1987 } 1988 } 1989 if (!wait) { 1990 return -1; 1991 } 1992 JavaThread *thread = JavaThread::current(); 1993 ThreadBlockInVM tbivm(thread); 1994 1995 bool threadIsSuspended; 1996 do { 1997 thread->set_suspend_equivalent(); 1998 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1999 ::SEM_WAIT(sig_sem); 2000 2001 // were we externally suspended while we were waiting? 2002 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2003 if (threadIsSuspended) { 2004 // 2005 // The semaphore has been incremented, but while we were waiting 2006 // another thread suspended us. We don't want to continue running 2007 // while suspended because that would surprise the thread that 2008 // suspended us. 2009 // 2010 ::SEM_POST(sig_sem); 2011 2012 thread->java_suspend_self(); 2013 } 2014 } while (threadIsSuspended); 2015 } 2016} 2017 2018int os::signal_lookup() { 2019 return check_pending_signals(false); 2020} 2021 2022int os::signal_wait() { 2023 return check_pending_signals(true); 2024} 2025 2026//////////////////////////////////////////////////////////////////////////////// 2027// Virtual Memory 2028 2029int os::vm_page_size() { 2030 // Seems redundant as all get out 2031 assert(os::Bsd::page_size() != -1, "must call os::init"); 2032 return os::Bsd::page_size(); 2033} 2034 2035// Solaris allocates memory by pages. 2036int os::vm_allocation_granularity() { 2037 assert(os::Bsd::page_size() != -1, "must call os::init"); 2038 return os::Bsd::page_size(); 2039} 2040 2041// Rationale behind this function: 2042// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2043// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2044// samples for JITted code. Here we create private executable mapping over the code cache 2045// and then we can use standard (well, almost, as mapping can change) way to provide 2046// info for the reporting script by storing timestamp and location of symbol 2047void bsd_wrap_code(char* base, size_t size) { 2048 static volatile jint cnt = 0; 2049 2050 if (!UseOprofile) { 2051 return; 2052 } 2053 2054 char buf[PATH_MAX + 1]; 2055 int num = Atomic::add(1, &cnt); 2056 2057 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2058 os::get_temp_directory(), os::current_process_id(), num); 2059 unlink(buf); 2060 2061 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2062 2063 if (fd != -1) { 2064 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2065 if (rv != (off_t)-1) { 2066 if (::write(fd, "", 1) == 1) { 2067 mmap(base, size, 2068 PROT_READ|PROT_WRITE|PROT_EXEC, 2069 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2070 } 2071 } 2072 ::close(fd); 2073 unlink(buf); 2074 } 2075} 2076 2077// NOTE: Bsd kernel does not really reserve the pages for us. 2078// All it does is to check if there are enough free pages 2079// left at the time of mmap(). This could be a potential 2080// problem. 2081bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2082 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2083#ifdef __OpenBSD__ 2084 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2085 return ::mprotect(addr, size, prot) == 0; 2086#else 2087 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2088 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2089 return res != (uintptr_t) MAP_FAILED; 2090#endif 2091} 2092 2093 2094bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2095 bool exec) { 2096 return commit_memory(addr, size, exec); 2097} 2098 2099void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2100} 2101 2102void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2103 ::madvise(addr, bytes, MADV_DONTNEED); 2104} 2105 2106void os::numa_make_global(char *addr, size_t bytes) { 2107} 2108 2109void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2110} 2111 2112bool os::numa_topology_changed() { return false; } 2113 2114size_t os::numa_get_groups_num() { 2115 return 1; 2116} 2117 2118int os::numa_get_group_id() { 2119 return 0; 2120} 2121 2122size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2123 if (size > 0) { 2124 ids[0] = 0; 2125 return 1; 2126 } 2127 return 0; 2128} 2129 2130bool os::get_page_info(char *start, page_info* info) { 2131 return false; 2132} 2133 2134char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2135 return end; 2136} 2137 2138 2139bool os::pd_uncommit_memory(char* addr, size_t size) { 2140#ifdef __OpenBSD__ 2141 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2142 return ::mprotect(addr, size, PROT_NONE) == 0; 2143#else 2144 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2145 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2146 return res != (uintptr_t) MAP_FAILED; 2147#endif 2148} 2149 2150bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2151 return os::commit_memory(addr, size); 2152} 2153 2154// If this is a growable mapping, remove the guard pages entirely by 2155// munmap()ping them. If not, just call uncommit_memory(). 2156bool os::remove_stack_guard_pages(char* addr, size_t size) { 2157 return os::uncommit_memory(addr, size); 2158} 2159 2160static address _highest_vm_reserved_address = NULL; 2161 2162// If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2163// at 'requested_addr'. If there are existing memory mappings at the same 2164// location, however, they will be overwritten. If 'fixed' is false, 2165// 'requested_addr' is only treated as a hint, the return value may or 2166// may not start from the requested address. Unlike Bsd mmap(), this 2167// function returns NULL to indicate failure. 2168static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2169 char * addr; 2170 int flags; 2171 2172 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2173 if (fixed) { 2174 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2175 flags |= MAP_FIXED; 2176 } 2177 2178 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2179 // touch an uncommitted page. Otherwise, the read/write might 2180 // succeed if we have enough swap space to back the physical page. 2181 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2182 flags, -1, 0); 2183 2184 if (addr != MAP_FAILED) { 2185 // anon_mmap() should only get called during VM initialization, 2186 // don't need lock (actually we can skip locking even it can be called 2187 // from multiple threads, because _highest_vm_reserved_address is just a 2188 // hint about the upper limit of non-stack memory regions.) 2189 if ((address)addr + bytes > _highest_vm_reserved_address) { 2190 _highest_vm_reserved_address = (address)addr + bytes; 2191 } 2192 } 2193 2194 return addr == MAP_FAILED ? NULL : addr; 2195} 2196 2197// Don't update _highest_vm_reserved_address, because there might be memory 2198// regions above addr + size. If so, releasing a memory region only creates 2199// a hole in the address space, it doesn't help prevent heap-stack collision. 2200// 2201static int anon_munmap(char * addr, size_t size) { 2202 return ::munmap(addr, size) == 0; 2203} 2204 2205char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2206 size_t alignment_hint) { 2207 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2208} 2209 2210bool os::pd_release_memory(char* addr, size_t size) { 2211 return anon_munmap(addr, size); 2212} 2213 2214static bool bsd_mprotect(char* addr, size_t size, int prot) { 2215 // Bsd wants the mprotect address argument to be page aligned. 2216 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2217 2218 // According to SUSv3, mprotect() should only be used with mappings 2219 // established by mmap(), and mmap() always maps whole pages. Unaligned 2220 // 'addr' likely indicates problem in the VM (e.g. trying to change 2221 // protection of malloc'ed or statically allocated memory). Check the 2222 // caller if you hit this assert. 2223 assert(addr == bottom, "sanity check"); 2224 2225 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2226 return ::mprotect(bottom, size, prot) == 0; 2227} 2228 2229// Set protections specified 2230bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2231 bool is_committed) { 2232 unsigned int p = 0; 2233 switch (prot) { 2234 case MEM_PROT_NONE: p = PROT_NONE; break; 2235 case MEM_PROT_READ: p = PROT_READ; break; 2236 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2237 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2238 default: 2239 ShouldNotReachHere(); 2240 } 2241 // is_committed is unused. 2242 return bsd_mprotect(addr, bytes, p); 2243} 2244 2245bool os::guard_memory(char* addr, size_t size) { 2246 return bsd_mprotect(addr, size, PROT_NONE); 2247} 2248 2249bool os::unguard_memory(char* addr, size_t size) { 2250 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2251} 2252 2253bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2254 return false; 2255} 2256 2257// Large page support 2258 2259static size_t _large_page_size = 0; 2260 2261void os::large_page_init() { 2262} 2263 2264 2265char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 2266 // "exec" is passed in but not used. Creating the shared image for 2267 // the code cache doesn't have an SHM_X executable permission to check. 2268 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2269 2270 key_t key = IPC_PRIVATE; 2271 char *addr; 2272 2273 bool warn_on_failure = UseLargePages && 2274 (!FLAG_IS_DEFAULT(UseLargePages) || 2275 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2276 ); 2277 char msg[128]; 2278 2279 // Create a large shared memory region to attach to based on size. 2280 // Currently, size is the total size of the heap 2281 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2282 if (shmid == -1) { 2283 // Possible reasons for shmget failure: 2284 // 1. shmmax is too small for Java heap. 2285 // > check shmmax value: cat /proc/sys/kernel/shmmax 2286 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2287 // 2. not enough large page memory. 2288 // > check available large pages: cat /proc/meminfo 2289 // > increase amount of large pages: 2290 // echo new_value > /proc/sys/vm/nr_hugepages 2291 // Note 1: different Bsd may use different name for this property, 2292 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2293 // Note 2: it's possible there's enough physical memory available but 2294 // they are so fragmented after a long run that they can't 2295 // coalesce into large pages. Try to reserve large pages when 2296 // the system is still "fresh". 2297 if (warn_on_failure) { 2298 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2299 warning(msg); 2300 } 2301 return NULL; 2302 } 2303 2304 // attach to the region 2305 addr = (char*)shmat(shmid, req_addr, 0); 2306 int err = errno; 2307 2308 // Remove shmid. If shmat() is successful, the actual shared memory segment 2309 // will be deleted when it's detached by shmdt() or when the process 2310 // terminates. If shmat() is not successful this will remove the shared 2311 // segment immediately. 2312 shmctl(shmid, IPC_RMID, NULL); 2313 2314 if ((intptr_t)addr == -1) { 2315 if (warn_on_failure) { 2316 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2317 warning(msg); 2318 } 2319 return NULL; 2320 } 2321 2322 // The memory is committed 2323 address pc = CALLER_PC; 2324 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); 2325 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); 2326 2327 return addr; 2328} 2329 2330bool os::release_memory_special(char* base, size_t bytes) { 2331 // detaching the SHM segment will also delete it, see reserve_memory_special() 2332 int rslt = shmdt(base); 2333 if (rslt == 0) { 2334 MemTracker::record_virtual_memory_uncommit((address)base, bytes); 2335 MemTracker::record_virtual_memory_release((address)base, bytes); 2336 return true; 2337 } else { 2338 return false; 2339 } 2340 2341} 2342 2343size_t os::large_page_size() { 2344 return _large_page_size; 2345} 2346 2347// HugeTLBFS allows application to commit large page memory on demand; 2348// with SysV SHM the entire memory region must be allocated as shared 2349// memory. 2350bool os::can_commit_large_page_memory() { 2351 return UseHugeTLBFS; 2352} 2353 2354bool os::can_execute_large_page_memory() { 2355 return UseHugeTLBFS; 2356} 2357 2358// Reserve memory at an arbitrary address, only if that area is 2359// available (and not reserved for something else). 2360 2361char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2362 const int max_tries = 10; 2363 char* base[max_tries]; 2364 size_t size[max_tries]; 2365 const size_t gap = 0x000000; 2366 2367 // Assert only that the size is a multiple of the page size, since 2368 // that's all that mmap requires, and since that's all we really know 2369 // about at this low abstraction level. If we need higher alignment, 2370 // we can either pass an alignment to this method or verify alignment 2371 // in one of the methods further up the call chain. See bug 5044738. 2372 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2373 2374 // Repeatedly allocate blocks until the block is allocated at the 2375 // right spot. Give up after max_tries. Note that reserve_memory() will 2376 // automatically update _highest_vm_reserved_address if the call is 2377 // successful. The variable tracks the highest memory address every reserved 2378 // by JVM. It is used to detect heap-stack collision if running with 2379 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2380 // space than needed, it could confuse the collision detecting code. To 2381 // solve the problem, save current _highest_vm_reserved_address and 2382 // calculate the correct value before return. 2383 address old_highest = _highest_vm_reserved_address; 2384 2385 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2386 // if kernel honors the hint then we can return immediately. 2387 char * addr = anon_mmap(requested_addr, bytes, false); 2388 if (addr == requested_addr) { 2389 return requested_addr; 2390 } 2391 2392 if (addr != NULL) { 2393 // mmap() is successful but it fails to reserve at the requested address 2394 anon_munmap(addr, bytes); 2395 } 2396 2397 int i; 2398 for (i = 0; i < max_tries; ++i) { 2399 base[i] = reserve_memory(bytes); 2400 2401 if (base[i] != NULL) { 2402 // Is this the block we wanted? 2403 if (base[i] == requested_addr) { 2404 size[i] = bytes; 2405 break; 2406 } 2407 2408 // Does this overlap the block we wanted? Give back the overlapped 2409 // parts and try again. 2410 2411 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2412 if (top_overlap >= 0 && top_overlap < bytes) { 2413 unmap_memory(base[i], top_overlap); 2414 base[i] += top_overlap; 2415 size[i] = bytes - top_overlap; 2416 } else { 2417 size_t bottom_overlap = base[i] + bytes - requested_addr; 2418 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2419 unmap_memory(requested_addr, bottom_overlap); 2420 size[i] = bytes - bottom_overlap; 2421 } else { 2422 size[i] = bytes; 2423 } 2424 } 2425 } 2426 } 2427 2428 // Give back the unused reserved pieces. 2429 2430 for (int j = 0; j < i; ++j) { 2431 if (base[j] != NULL) { 2432 unmap_memory(base[j], size[j]); 2433 } 2434 } 2435 2436 if (i < max_tries) { 2437 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2438 return requested_addr; 2439 } else { 2440 _highest_vm_reserved_address = old_highest; 2441 return NULL; 2442 } 2443} 2444 2445size_t os::read(int fd, void *buf, unsigned int nBytes) { 2446 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2447} 2448 2449// TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2450// Solaris uses poll(), bsd uses park(). 2451// Poll() is likely a better choice, assuming that Thread.interrupt() 2452// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2453// SIGSEGV, see 4355769. 2454 2455int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2456 assert(thread == Thread::current(), "thread consistency check"); 2457 2458 ParkEvent * const slp = thread->_SleepEvent ; 2459 slp->reset() ; 2460 OrderAccess::fence() ; 2461 2462 if (interruptible) { 2463 jlong prevtime = javaTimeNanos(); 2464 2465 for (;;) { 2466 if (os::is_interrupted(thread, true)) { 2467 return OS_INTRPT; 2468 } 2469 2470 jlong newtime = javaTimeNanos(); 2471 2472 if (newtime - prevtime < 0) { 2473 // time moving backwards, should only happen if no monotonic clock 2474 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2475 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2476 } else { 2477 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2478 } 2479 2480 if(millis <= 0) { 2481 return OS_OK; 2482 } 2483 2484 prevtime = newtime; 2485 2486 { 2487 assert(thread->is_Java_thread(), "sanity check"); 2488 JavaThread *jt = (JavaThread *) thread; 2489 ThreadBlockInVM tbivm(jt); 2490 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2491 2492 jt->set_suspend_equivalent(); 2493 // cleared by handle_special_suspend_equivalent_condition() or 2494 // java_suspend_self() via check_and_wait_while_suspended() 2495 2496 slp->park(millis); 2497 2498 // were we externally suspended while we were waiting? 2499 jt->check_and_wait_while_suspended(); 2500 } 2501 } 2502 } else { 2503 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2504 jlong prevtime = javaTimeNanos(); 2505 2506 for (;;) { 2507 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2508 // the 1st iteration ... 2509 jlong newtime = javaTimeNanos(); 2510 2511 if (newtime - prevtime < 0) { 2512 // time moving backwards, should only happen if no monotonic clock 2513 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2514 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2515 } else { 2516 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2517 } 2518 2519 if(millis <= 0) break ; 2520 2521 prevtime = newtime; 2522 slp->park(millis); 2523 } 2524 return OS_OK ; 2525 } 2526} 2527 2528int os::naked_sleep() { 2529 // %% make the sleep time an integer flag. for now use 1 millisec. 2530 return os::sleep(Thread::current(), 1, false); 2531} 2532 2533// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2534void os::infinite_sleep() { 2535 while (true) { // sleep forever ... 2536 ::sleep(100); // ... 100 seconds at a time 2537 } 2538} 2539 2540// Used to convert frequent JVM_Yield() to nops 2541bool os::dont_yield() { 2542 return DontYieldALot; 2543} 2544 2545void os::yield() { 2546 sched_yield(); 2547} 2548 2549os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2550 2551void os::yield_all(int attempts) { 2552 // Yields to all threads, including threads with lower priorities 2553 // Threads on Bsd are all with same priority. The Solaris style 2554 // os::yield_all() with nanosleep(1ms) is not necessary. 2555 sched_yield(); 2556} 2557 2558// Called from the tight loops to possibly influence time-sharing heuristics 2559void os::loop_breaker(int attempts) { 2560 os::yield_all(attempts); 2561} 2562 2563//////////////////////////////////////////////////////////////////////////////// 2564// thread priority support 2565 2566// Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2567// only supports dynamic priority, static priority must be zero. For real-time 2568// applications, Bsd supports SCHED_RR which allows static priority (1-99). 2569// However, for large multi-threaded applications, SCHED_RR is not only slower 2570// than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2571// of 5 runs - Sep 2005). 2572// 2573// The following code actually changes the niceness of kernel-thread/LWP. It 2574// has an assumption that setpriority() only modifies one kernel-thread/LWP, 2575// not the entire user process, and user level threads are 1:1 mapped to kernel 2576// threads. It has always been the case, but could change in the future. For 2577// this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2578// It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2579 2580#if !defined(__APPLE__) 2581int os::java_to_os_priority[CriticalPriority + 1] = { 2582 19, // 0 Entry should never be used 2583 2584 0, // 1 MinPriority 2585 3, // 2 2586 6, // 3 2587 2588 10, // 4 2589 15, // 5 NormPriority 2590 18, // 6 2591 2592 21, // 7 2593 25, // 8 2594 28, // 9 NearMaxPriority 2595 2596 31, // 10 MaxPriority 2597 2598 31 // 11 CriticalPriority 2599}; 2600#else 2601/* Using Mach high-level priority assignments */ 2602int os::java_to_os_priority[CriticalPriority + 1] = { 2603 0, // 0 Entry should never be used (MINPRI_USER) 2604 2605 27, // 1 MinPriority 2606 28, // 2 2607 29, // 3 2608 2609 30, // 4 2610 31, // 5 NormPriority (BASEPRI_DEFAULT) 2611 32, // 6 2612 2613 33, // 7 2614 34, // 8 2615 35, // 9 NearMaxPriority 2616 2617 36, // 10 MaxPriority 2618 2619 36 // 11 CriticalPriority 2620}; 2621#endif 2622 2623static int prio_init() { 2624 if (ThreadPriorityPolicy == 1) { 2625 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2626 // if effective uid is not root. Perhaps, a more elegant way of doing 2627 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2628 if (geteuid() != 0) { 2629 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2630 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2631 } 2632 ThreadPriorityPolicy = 0; 2633 } 2634 } 2635 if (UseCriticalJavaThreadPriority) { 2636 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2637 } 2638 return 0; 2639} 2640 2641OSReturn os::set_native_priority(Thread* thread, int newpri) { 2642 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2643 2644#ifdef __OpenBSD__ 2645 // OpenBSD pthread_setprio starves low priority threads 2646 return OS_OK; 2647#elif defined(__FreeBSD__) 2648 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2649#elif defined(__APPLE__) || defined(__NetBSD__) 2650 struct sched_param sp; 2651 int policy; 2652 pthread_t self = pthread_self(); 2653 2654 if (pthread_getschedparam(self, &policy, &sp) != 0) 2655 return OS_ERR; 2656 2657 sp.sched_priority = newpri; 2658 if (pthread_setschedparam(self, policy, &sp) != 0) 2659 return OS_ERR; 2660 2661 return OS_OK; 2662#else 2663 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2664 return (ret == 0) ? OS_OK : OS_ERR; 2665#endif 2666} 2667 2668OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2669 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2670 *priority_ptr = java_to_os_priority[NormPriority]; 2671 return OS_OK; 2672 } 2673 2674 errno = 0; 2675#if defined(__OpenBSD__) || defined(__FreeBSD__) 2676 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2677#elif defined(__APPLE__) || defined(__NetBSD__) 2678 int policy; 2679 struct sched_param sp; 2680 2681 pthread_getschedparam(pthread_self(), &policy, &sp); 2682 *priority_ptr = sp.sched_priority; 2683#else 2684 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2685#endif 2686 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2687} 2688 2689// Hint to the underlying OS that a task switch would not be good. 2690// Void return because it's a hint and can fail. 2691void os::hint_no_preempt() {} 2692 2693//////////////////////////////////////////////////////////////////////////////// 2694// suspend/resume support 2695 2696// the low-level signal-based suspend/resume support is a remnant from the 2697// old VM-suspension that used to be for java-suspension, safepoints etc, 2698// within hotspot. Now there is a single use-case for this: 2699// - calling get_thread_pc() on the VMThread by the flat-profiler task 2700// that runs in the watcher thread. 2701// The remaining code is greatly simplified from the more general suspension 2702// code that used to be used. 2703// 2704// The protocol is quite simple: 2705// - suspend: 2706// - sends a signal to the target thread 2707// - polls the suspend state of the osthread using a yield loop 2708// - target thread signal handler (SR_handler) sets suspend state 2709// and blocks in sigsuspend until continued 2710// - resume: 2711// - sets target osthread state to continue 2712// - sends signal to end the sigsuspend loop in the SR_handler 2713// 2714// Note that the SR_lock plays no role in this suspend/resume protocol. 2715// 2716 2717static void resume_clear_context(OSThread *osthread) { 2718 osthread->set_ucontext(NULL); 2719 osthread->set_siginfo(NULL); 2720} 2721 2722static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2723 osthread->set_ucontext(context); 2724 osthread->set_siginfo(siginfo); 2725} 2726 2727// 2728// Handler function invoked when a thread's execution is suspended or 2729// resumed. We have to be careful that only async-safe functions are 2730// called here (Note: most pthread functions are not async safe and 2731// should be avoided.) 2732// 2733// Note: sigwait() is a more natural fit than sigsuspend() from an 2734// interface point of view, but sigwait() prevents the signal hander 2735// from being run. libpthread would get very confused by not having 2736// its signal handlers run and prevents sigwait()'s use with the 2737// mutex granting granting signal. 2738// 2739// Currently only ever called on the VMThread or JavaThread 2740// 2741static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2742 // Save and restore errno to avoid confusing native code with EINTR 2743 // after sigsuspend. 2744 int old_errno = errno; 2745 2746 Thread* thread = Thread::current(); 2747 OSThread* osthread = thread->osthread(); 2748 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2749 2750 os::SuspendResume::State current = osthread->sr.state(); 2751 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2752 suspend_save_context(osthread, siginfo, context); 2753 2754 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2755 os::SuspendResume::State state = osthread->sr.suspended(); 2756 if (state == os::SuspendResume::SR_SUSPENDED) { 2757 sigset_t suspend_set; // signals for sigsuspend() 2758 2759 // get current set of blocked signals and unblock resume signal 2760 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2761 sigdelset(&suspend_set, SR_signum); 2762 2763 sr_semaphore.signal(); 2764 // wait here until we are resumed 2765 while (1) { 2766 sigsuspend(&suspend_set); 2767 2768 os::SuspendResume::State result = osthread->sr.running(); 2769 if (result == os::SuspendResume::SR_RUNNING) { 2770 sr_semaphore.signal(); 2771 break; 2772 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2773 ShouldNotReachHere(); 2774 } 2775 } 2776 2777 } else if (state == os::SuspendResume::SR_RUNNING) { 2778 // request was cancelled, continue 2779 } else { 2780 ShouldNotReachHere(); 2781 } 2782 2783 resume_clear_context(osthread); 2784 } else if (current == os::SuspendResume::SR_RUNNING) { 2785 // request was cancelled, continue 2786 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2787 // ignore 2788 } else { 2789 // ignore 2790 } 2791 2792 errno = old_errno; 2793} 2794 2795 2796static int SR_initialize() { 2797 struct sigaction act; 2798 char *s; 2799 /* Get signal number to use for suspend/resume */ 2800 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2801 int sig = ::strtol(s, 0, 10); 2802 if (sig > 0 || sig < NSIG) { 2803 SR_signum = sig; 2804 } 2805 } 2806 2807 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2808 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2809 2810 sigemptyset(&SR_sigset); 2811 sigaddset(&SR_sigset, SR_signum); 2812 2813 /* Set up signal handler for suspend/resume */ 2814 act.sa_flags = SA_RESTART|SA_SIGINFO; 2815 act.sa_handler = (void (*)(int)) SR_handler; 2816 2817 // SR_signum is blocked by default. 2818 // 4528190 - We also need to block pthread restart signal (32 on all 2819 // supported Bsd platforms). Note that BsdThreads need to block 2820 // this signal for all threads to work properly. So we don't have 2821 // to use hard-coded signal number when setting up the mask. 2822 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2823 2824 if (sigaction(SR_signum, &act, 0) == -1) { 2825 return -1; 2826 } 2827 2828 // Save signal flag 2829 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2830 return 0; 2831} 2832 2833static int sr_notify(OSThread* osthread) { 2834 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2835 assert_status(status == 0, status, "pthread_kill"); 2836 return status; 2837} 2838 2839// "Randomly" selected value for how long we want to spin 2840// before bailing out on suspending a thread, also how often 2841// we send a signal to a thread we want to resume 2842static const int RANDOMLY_LARGE_INTEGER = 1000000; 2843static const int RANDOMLY_LARGE_INTEGER2 = 100; 2844 2845// returns true on success and false on error - really an error is fatal 2846// but this seems the normal response to library errors 2847static bool do_suspend(OSThread* osthread) { 2848 assert(osthread->sr.is_running(), "thread should be running"); 2849 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2850 2851 // mark as suspended and send signal 2852 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2853 // failed to switch, state wasn't running? 2854 ShouldNotReachHere(); 2855 return false; 2856 } 2857 2858 if (sr_notify(osthread) != 0) { 2859 ShouldNotReachHere(); 2860 } 2861 2862 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2863 while (true) { 2864 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2865 break; 2866 } else { 2867 // timeout 2868 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2869 if (cancelled == os::SuspendResume::SR_RUNNING) { 2870 return false; 2871 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2872 // make sure that we consume the signal on the semaphore as well 2873 sr_semaphore.wait(); 2874 break; 2875 } else { 2876 ShouldNotReachHere(); 2877 return false; 2878 } 2879 } 2880 } 2881 2882 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2883 return true; 2884} 2885 2886static void do_resume(OSThread* osthread) { 2887 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2888 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2889 2890 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2891 // failed to switch to WAKEUP_REQUEST 2892 ShouldNotReachHere(); 2893 return; 2894 } 2895 2896 while (true) { 2897 if (sr_notify(osthread) == 0) { 2898 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2899 if (osthread->sr.is_running()) { 2900 return; 2901 } 2902 } 2903 } else { 2904 ShouldNotReachHere(); 2905 } 2906 } 2907 2908 guarantee(osthread->sr.is_running(), "Must be running!"); 2909} 2910 2911//////////////////////////////////////////////////////////////////////////////// 2912// interrupt support 2913 2914void os::interrupt(Thread* thread) { 2915 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2916 "possibility of dangling Thread pointer"); 2917 2918 OSThread* osthread = thread->osthread(); 2919 2920 if (!osthread->interrupted()) { 2921 osthread->set_interrupted(true); 2922 // More than one thread can get here with the same value of osthread, 2923 // resulting in multiple notifications. We do, however, want the store 2924 // to interrupted() to be visible to other threads before we execute unpark(). 2925 OrderAccess::fence(); 2926 ParkEvent * const slp = thread->_SleepEvent ; 2927 if (slp != NULL) slp->unpark() ; 2928 } 2929 2930 // For JSR166. Unpark even if interrupt status already was set 2931 if (thread->is_Java_thread()) 2932 ((JavaThread*)thread)->parker()->unpark(); 2933 2934 ParkEvent * ev = thread->_ParkEvent ; 2935 if (ev != NULL) ev->unpark() ; 2936 2937} 2938 2939bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2940 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2941 "possibility of dangling Thread pointer"); 2942 2943 OSThread* osthread = thread->osthread(); 2944 2945 bool interrupted = osthread->interrupted(); 2946 2947 if (interrupted && clear_interrupted) { 2948 osthread->set_interrupted(false); 2949 // consider thread->_SleepEvent->reset() ... optional optimization 2950 } 2951 2952 return interrupted; 2953} 2954 2955/////////////////////////////////////////////////////////////////////////////////// 2956// signal handling (except suspend/resume) 2957 2958// This routine may be used by user applications as a "hook" to catch signals. 2959// The user-defined signal handler must pass unrecognized signals to this 2960// routine, and if it returns true (non-zero), then the signal handler must 2961// return immediately. If the flag "abort_if_unrecognized" is true, then this 2962// routine will never retun false (zero), but instead will execute a VM panic 2963// routine kill the process. 2964// 2965// If this routine returns false, it is OK to call it again. This allows 2966// the user-defined signal handler to perform checks either before or after 2967// the VM performs its own checks. Naturally, the user code would be making 2968// a serious error if it tried to handle an exception (such as a null check 2969// or breakpoint) that the VM was generating for its own correct operation. 2970// 2971// This routine may recognize any of the following kinds of signals: 2972// SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2973// It should be consulted by handlers for any of those signals. 2974// 2975// The caller of this routine must pass in the three arguments supplied 2976// to the function referred to in the "sa_sigaction" (not the "sa_handler") 2977// field of the structure passed to sigaction(). This routine assumes that 2978// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2979// 2980// Note that the VM will print warnings if it detects conflicting signal 2981// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2982// 2983extern "C" JNIEXPORT int 2984JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2985 void* ucontext, int abort_if_unrecognized); 2986 2987void signalHandler(int sig, siginfo_t* info, void* uc) { 2988 assert(info != NULL && uc != NULL, "it must be old kernel"); 2989 int orig_errno = errno; // Preserve errno value over signal handler. 2990 JVM_handle_bsd_signal(sig, info, uc, true); 2991 errno = orig_errno; 2992} 2993 2994 2995// This boolean allows users to forward their own non-matching signals 2996// to JVM_handle_bsd_signal, harmlessly. 2997bool os::Bsd::signal_handlers_are_installed = false; 2998 2999// For signal-chaining 3000struct sigaction os::Bsd::sigact[MAXSIGNUM]; 3001unsigned int os::Bsd::sigs = 0; 3002bool os::Bsd::libjsig_is_loaded = false; 3003typedef struct sigaction *(*get_signal_t)(int); 3004get_signal_t os::Bsd::get_signal_action = NULL; 3005 3006struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 3007 struct sigaction *actp = NULL; 3008 3009 if (libjsig_is_loaded) { 3010 // Retrieve the old signal handler from libjsig 3011 actp = (*get_signal_action)(sig); 3012 } 3013 if (actp == NULL) { 3014 // Retrieve the preinstalled signal handler from jvm 3015 actp = get_preinstalled_handler(sig); 3016 } 3017 3018 return actp; 3019} 3020 3021static bool call_chained_handler(struct sigaction *actp, int sig, 3022 siginfo_t *siginfo, void *context) { 3023 // Call the old signal handler 3024 if (actp->sa_handler == SIG_DFL) { 3025 // It's more reasonable to let jvm treat it as an unexpected exception 3026 // instead of taking the default action. 3027 return false; 3028 } else if (actp->sa_handler != SIG_IGN) { 3029 if ((actp->sa_flags & SA_NODEFER) == 0) { 3030 // automaticlly block the signal 3031 sigaddset(&(actp->sa_mask), sig); 3032 } 3033 3034 sa_handler_t hand; 3035 sa_sigaction_t sa; 3036 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3037 // retrieve the chained handler 3038 if (siginfo_flag_set) { 3039 sa = actp->sa_sigaction; 3040 } else { 3041 hand = actp->sa_handler; 3042 } 3043 3044 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3045 actp->sa_handler = SIG_DFL; 3046 } 3047 3048 // try to honor the signal mask 3049 sigset_t oset; 3050 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3051 3052 // call into the chained handler 3053 if (siginfo_flag_set) { 3054 (*sa)(sig, siginfo, context); 3055 } else { 3056 (*hand)(sig); 3057 } 3058 3059 // restore the signal mask 3060 pthread_sigmask(SIG_SETMASK, &oset, 0); 3061 } 3062 // Tell jvm's signal handler the signal is taken care of. 3063 return true; 3064} 3065 3066bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3067 bool chained = false; 3068 // signal-chaining 3069 if (UseSignalChaining) { 3070 struct sigaction *actp = get_chained_signal_action(sig); 3071 if (actp != NULL) { 3072 chained = call_chained_handler(actp, sig, siginfo, context); 3073 } 3074 } 3075 return chained; 3076} 3077 3078struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3079 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 3080 return &sigact[sig]; 3081 } 3082 return NULL; 3083} 3084 3085void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3086 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3087 sigact[sig] = oldAct; 3088 sigs |= (unsigned int)1 << sig; 3089} 3090 3091// for diagnostic 3092int os::Bsd::sigflags[MAXSIGNUM]; 3093 3094int os::Bsd::get_our_sigflags(int sig) { 3095 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3096 return sigflags[sig]; 3097} 3098 3099void os::Bsd::set_our_sigflags(int sig, int flags) { 3100 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3101 sigflags[sig] = flags; 3102} 3103 3104void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3105 // Check for overwrite. 3106 struct sigaction oldAct; 3107 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3108 3109 void* oldhand = oldAct.sa_sigaction 3110 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3111 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3112 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3113 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3114 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3115 if (AllowUserSignalHandlers || !set_installed) { 3116 // Do not overwrite; user takes responsibility to forward to us. 3117 return; 3118 } else if (UseSignalChaining) { 3119 // save the old handler in jvm 3120 save_preinstalled_handler(sig, oldAct); 3121 // libjsig also interposes the sigaction() call below and saves the 3122 // old sigaction on it own. 3123 } else { 3124 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3125 "%#lx for signal %d.", (long)oldhand, sig)); 3126 } 3127 } 3128 3129 struct sigaction sigAct; 3130 sigfillset(&(sigAct.sa_mask)); 3131 sigAct.sa_handler = SIG_DFL; 3132 if (!set_installed) { 3133 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3134 } else { 3135 sigAct.sa_sigaction = signalHandler; 3136 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3137 } 3138#if __APPLE__ 3139 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3140 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3141 // if the signal handler declares it will handle it on alternate stack. 3142 // Notice we only declare we will handle it on alt stack, but we are not 3143 // actually going to use real alt stack - this is just a workaround. 3144 // Please see ux_exception.c, method catch_mach_exception_raise for details 3145 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3146 if (sig == SIGSEGV) { 3147 sigAct.sa_flags |= SA_ONSTACK; 3148 } 3149#endif 3150 3151 // Save flags, which are set by ours 3152 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3153 sigflags[sig] = sigAct.sa_flags; 3154 3155 int ret = sigaction(sig, &sigAct, &oldAct); 3156 assert(ret == 0, "check"); 3157 3158 void* oldhand2 = oldAct.sa_sigaction 3159 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3160 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3161 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3162} 3163 3164// install signal handlers for signals that HotSpot needs to 3165// handle in order to support Java-level exception handling. 3166 3167void os::Bsd::install_signal_handlers() { 3168 if (!signal_handlers_are_installed) { 3169 signal_handlers_are_installed = true; 3170 3171 // signal-chaining 3172 typedef void (*signal_setting_t)(); 3173 signal_setting_t begin_signal_setting = NULL; 3174 signal_setting_t end_signal_setting = NULL; 3175 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3176 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3177 if (begin_signal_setting != NULL) { 3178 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3179 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3180 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3181 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3182 libjsig_is_loaded = true; 3183 assert(UseSignalChaining, "should enable signal-chaining"); 3184 } 3185 if (libjsig_is_loaded) { 3186 // Tell libjsig jvm is setting signal handlers 3187 (*begin_signal_setting)(); 3188 } 3189 3190 set_signal_handler(SIGSEGV, true); 3191 set_signal_handler(SIGPIPE, true); 3192 set_signal_handler(SIGBUS, true); 3193 set_signal_handler(SIGILL, true); 3194 set_signal_handler(SIGFPE, true); 3195 set_signal_handler(SIGXFSZ, true); 3196 3197#if defined(__APPLE__) 3198 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3199 // signals caught and handled by the JVM. To work around this, we reset the mach task 3200 // signal handler that's placed on our process by CrashReporter. This disables 3201 // CrashReporter-based reporting. 3202 // 3203 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3204 // on caught fatal signals. 3205 // 3206 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3207 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3208 // exception handling, while leaving the standard BSD signal handlers functional. 3209 kern_return_t kr; 3210 kr = task_set_exception_ports(mach_task_self(), 3211 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3212 MACH_PORT_NULL, 3213 EXCEPTION_STATE_IDENTITY, 3214 MACHINE_THREAD_STATE); 3215 3216 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3217#endif 3218 3219 if (libjsig_is_loaded) { 3220 // Tell libjsig jvm finishes setting signal handlers 3221 (*end_signal_setting)(); 3222 } 3223 3224 // We don't activate signal checker if libjsig is in place, we trust ourselves 3225 // and if UserSignalHandler is installed all bets are off 3226 if (CheckJNICalls) { 3227 if (libjsig_is_loaded) { 3228 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3229 check_signals = false; 3230 } 3231 if (AllowUserSignalHandlers) { 3232 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3233 check_signals = false; 3234 } 3235 } 3236 } 3237} 3238 3239 3240///// 3241// glibc on Bsd platform uses non-documented flag 3242// to indicate, that some special sort of signal 3243// trampoline is used. 3244// We will never set this flag, and we should 3245// ignore this flag in our diagnostic 3246#ifdef SIGNIFICANT_SIGNAL_MASK 3247#undef SIGNIFICANT_SIGNAL_MASK 3248#endif 3249#define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3250 3251static const char* get_signal_handler_name(address handler, 3252 char* buf, int buflen) { 3253 int offset; 3254 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3255 if (found) { 3256 // skip directory names 3257 const char *p1, *p2; 3258 p1 = buf; 3259 size_t len = strlen(os::file_separator()); 3260 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3261 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3262 } else { 3263 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3264 } 3265 return buf; 3266} 3267 3268static void print_signal_handler(outputStream* st, int sig, 3269 char* buf, size_t buflen) { 3270 struct sigaction sa; 3271 3272 sigaction(sig, NULL, &sa); 3273 3274 // See comment for SIGNIFICANT_SIGNAL_MASK define 3275 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3276 3277 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3278 3279 address handler = (sa.sa_flags & SA_SIGINFO) 3280 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3281 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3282 3283 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3284 st->print("SIG_DFL"); 3285 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3286 st->print("SIG_IGN"); 3287 } else { 3288 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3289 } 3290 3291 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3292 3293 address rh = VMError::get_resetted_sighandler(sig); 3294 // May be, handler was resetted by VMError? 3295 if(rh != NULL) { 3296 handler = rh; 3297 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3298 } 3299 3300 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3301 3302 // Check: is it our handler? 3303 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3304 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3305 // It is our signal handler 3306 // check for flags, reset system-used one! 3307 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3308 st->print( 3309 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3310 os::Bsd::get_our_sigflags(sig)); 3311 } 3312 } 3313 st->cr(); 3314} 3315 3316 3317#define DO_SIGNAL_CHECK(sig) \ 3318 if (!sigismember(&check_signal_done, sig)) \ 3319 os::Bsd::check_signal_handler(sig) 3320 3321// This method is a periodic task to check for misbehaving JNI applications 3322// under CheckJNI, we can add any periodic checks here 3323 3324void os::run_periodic_checks() { 3325 3326 if (check_signals == false) return; 3327 3328 // SEGV and BUS if overridden could potentially prevent 3329 // generation of hs*.log in the event of a crash, debugging 3330 // such a case can be very challenging, so we absolutely 3331 // check the following for a good measure: 3332 DO_SIGNAL_CHECK(SIGSEGV); 3333 DO_SIGNAL_CHECK(SIGILL); 3334 DO_SIGNAL_CHECK(SIGFPE); 3335 DO_SIGNAL_CHECK(SIGBUS); 3336 DO_SIGNAL_CHECK(SIGPIPE); 3337 DO_SIGNAL_CHECK(SIGXFSZ); 3338 3339 3340 // ReduceSignalUsage allows the user to override these handlers 3341 // see comments at the very top and jvm_solaris.h 3342 if (!ReduceSignalUsage) { 3343 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3344 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3345 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3346 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3347 } 3348 3349 DO_SIGNAL_CHECK(SR_signum); 3350 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3351} 3352 3353typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3354 3355static os_sigaction_t os_sigaction = NULL; 3356 3357void os::Bsd::check_signal_handler(int sig) { 3358 char buf[O_BUFLEN]; 3359 address jvmHandler = NULL; 3360 3361 3362 struct sigaction act; 3363 if (os_sigaction == NULL) { 3364 // only trust the default sigaction, in case it has been interposed 3365 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3366 if (os_sigaction == NULL) return; 3367 } 3368 3369 os_sigaction(sig, (struct sigaction*)NULL, &act); 3370 3371 3372 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3373 3374 address thisHandler = (act.sa_flags & SA_SIGINFO) 3375 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3376 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3377 3378 3379 switch(sig) { 3380 case SIGSEGV: 3381 case SIGBUS: 3382 case SIGFPE: 3383 case SIGPIPE: 3384 case SIGILL: 3385 case SIGXFSZ: 3386 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3387 break; 3388 3389 case SHUTDOWN1_SIGNAL: 3390 case SHUTDOWN2_SIGNAL: 3391 case SHUTDOWN3_SIGNAL: 3392 case BREAK_SIGNAL: 3393 jvmHandler = (address)user_handler(); 3394 break; 3395 3396 case INTERRUPT_SIGNAL: 3397 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3398 break; 3399 3400 default: 3401 if (sig == SR_signum) { 3402 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3403 } else { 3404 return; 3405 } 3406 break; 3407 } 3408 3409 if (thisHandler != jvmHandler) { 3410 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3411 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3412 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3413 // No need to check this sig any longer 3414 sigaddset(&check_signal_done, sig); 3415 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3416 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3417 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3418 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3419 // No need to check this sig any longer 3420 sigaddset(&check_signal_done, sig); 3421 } 3422 3423 // Dump all the signal 3424 if (sigismember(&check_signal_done, sig)) { 3425 print_signal_handlers(tty, buf, O_BUFLEN); 3426 } 3427} 3428 3429extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3430 3431extern bool signal_name(int signo, char* buf, size_t len); 3432 3433const char* os::exception_name(int exception_code, char* buf, size_t size) { 3434 if (0 < exception_code && exception_code <= SIGRTMAX) { 3435 // signal 3436 if (!signal_name(exception_code, buf, size)) { 3437 jio_snprintf(buf, size, "SIG%d", exception_code); 3438 } 3439 return buf; 3440 } else { 3441 return NULL; 3442 } 3443} 3444 3445// this is called _before_ the most of global arguments have been parsed 3446void os::init(void) { 3447 char dummy; /* used to get a guess on initial stack address */ 3448// first_hrtime = gethrtime(); 3449 3450 // With BsdThreads the JavaMain thread pid (primordial thread) 3451 // is different than the pid of the java launcher thread. 3452 // So, on Bsd, the launcher thread pid is passed to the VM 3453 // via the sun.java.launcher.pid property. 3454 // Use this property instead of getpid() if it was correctly passed. 3455 // See bug 6351349. 3456 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3457 3458 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3459 3460 clock_tics_per_sec = CLK_TCK; 3461 3462 init_random(1234567); 3463 3464 ThreadCritical::initialize(); 3465 3466 Bsd::set_page_size(getpagesize()); 3467 if (Bsd::page_size() == -1) { 3468 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3469 strerror(errno))); 3470 } 3471 init_page_sizes((size_t) Bsd::page_size()); 3472 3473 Bsd::initialize_system_info(); 3474 3475 // main_thread points to the aboriginal thread 3476 Bsd::_main_thread = pthread_self(); 3477 3478 Bsd::clock_init(); 3479 initial_time_count = os::elapsed_counter(); 3480 3481#ifdef __APPLE__ 3482 // XXXDARWIN 3483 // Work around the unaligned VM callbacks in hotspot's 3484 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3485 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3486 // alignment when doing symbol lookup. To work around this, we force early 3487 // binding of all symbols now, thus binding when alignment is known-good. 3488 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3489#endif 3490} 3491 3492// To install functions for atexit system call 3493extern "C" { 3494 static void perfMemory_exit_helper() { 3495 perfMemory_exit(); 3496 } 3497} 3498 3499// this is called _after_ the global arguments have been parsed 3500jint os::init_2(void) 3501{ 3502 // Allocate a single page and mark it as readable for safepoint polling 3503 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3504 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3505 3506 os::set_polling_page( polling_page ); 3507 3508#ifndef PRODUCT 3509 if(Verbose && PrintMiscellaneous) 3510 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3511#endif 3512 3513 if (!UseMembar) { 3514 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3515 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 3516 os::set_memory_serialize_page( mem_serialize_page ); 3517 3518#ifndef PRODUCT 3519 if(Verbose && PrintMiscellaneous) 3520 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3521#endif 3522 } 3523 3524 os::large_page_init(); 3525 3526 // initialize suspend/resume support - must do this before signal_sets_init() 3527 if (SR_initialize() != 0) { 3528 perror("SR_initialize failed"); 3529 return JNI_ERR; 3530 } 3531 3532 Bsd::signal_sets_init(); 3533 Bsd::install_signal_handlers(); 3534 3535 // Check minimum allowable stack size for thread creation and to initialize 3536 // the java system classes, including StackOverflowError - depends on page 3537 // size. Add a page for compiler2 recursion in main thread. 3538 // Add in 2*BytesPerWord times page size to account for VM stack during 3539 // class initialization depending on 32 or 64 bit VM. 3540 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3541 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3542 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3543 3544 size_t threadStackSizeInBytes = ThreadStackSize * K; 3545 if (threadStackSizeInBytes != 0 && 3546 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3547 tty->print_cr("\nThe stack size specified is too small, " 3548 "Specify at least %dk", 3549 os::Bsd::min_stack_allowed/ K); 3550 return JNI_ERR; 3551 } 3552 3553 // Make the stack size a multiple of the page size so that 3554 // the yellow/red zones can be guarded. 3555 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3556 vm_page_size())); 3557 3558 if (MaxFDLimit) { 3559 // set the number of file descriptors to max. print out error 3560 // if getrlimit/setrlimit fails but continue regardless. 3561 struct rlimit nbr_files; 3562 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3563 if (status != 0) { 3564 if (PrintMiscellaneous && (Verbose || WizardMode)) 3565 perror("os::init_2 getrlimit failed"); 3566 } else { 3567 nbr_files.rlim_cur = nbr_files.rlim_max; 3568 3569#ifdef __APPLE__ 3570 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3571 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3572 // be used instead 3573 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3574#endif 3575 3576 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3577 if (status != 0) { 3578 if (PrintMiscellaneous && (Verbose || WizardMode)) 3579 perror("os::init_2 setrlimit failed"); 3580 } 3581 } 3582 } 3583 3584 // at-exit methods are called in the reverse order of their registration. 3585 // atexit functions are called on return from main or as a result of a 3586 // call to exit(3C). There can be only 32 of these functions registered 3587 // and atexit() does not set errno. 3588 3589 if (PerfAllowAtExitRegistration) { 3590 // only register atexit functions if PerfAllowAtExitRegistration is set. 3591 // atexit functions can be delayed until process exit time, which 3592 // can be problematic for embedded VM situations. Embedded VMs should 3593 // call DestroyJavaVM() to assure that VM resources are released. 3594 3595 // note: perfMemory_exit_helper atexit function may be removed in 3596 // the future if the appropriate cleanup code can be added to the 3597 // VM_Exit VMOperation's doit method. 3598 if (atexit(perfMemory_exit_helper) != 0) { 3599 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3600 } 3601 } 3602 3603 // initialize thread priority policy 3604 prio_init(); 3605 3606#ifdef __APPLE__ 3607 // dynamically link to objective c gc registration 3608 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3609 if (handleLibObjc != NULL) { 3610 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3611 } 3612#endif 3613 3614 return JNI_OK; 3615} 3616 3617// this is called at the end of vm_initialization 3618void os::init_3(void) { } 3619 3620// Mark the polling page as unreadable 3621void os::make_polling_page_unreadable(void) { 3622 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3623 fatal("Could not disable polling page"); 3624}; 3625 3626// Mark the polling page as readable 3627void os::make_polling_page_readable(void) { 3628 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3629 fatal("Could not enable polling page"); 3630 } 3631}; 3632 3633int os::active_processor_count() { 3634 return _processor_count; 3635} 3636 3637void os::set_native_thread_name(const char *name) { 3638#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3639 // This is only supported in Snow Leopard and beyond 3640 if (name != NULL) { 3641 // Add a "Java: " prefix to the name 3642 char buf[MAXTHREADNAMESIZE]; 3643 snprintf(buf, sizeof(buf), "Java: %s", name); 3644 pthread_setname_np(buf); 3645 } 3646#endif 3647} 3648 3649bool os::distribute_processes(uint length, uint* distribution) { 3650 // Not yet implemented. 3651 return false; 3652} 3653 3654bool os::bind_to_processor(uint processor_id) { 3655 // Not yet implemented. 3656 return false; 3657} 3658 3659void os::SuspendedThreadTask::internal_do_task() { 3660 if (do_suspend(_thread->osthread())) { 3661 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3662 do_task(context); 3663 do_resume(_thread->osthread()); 3664 } 3665} 3666 3667/// 3668class PcFetcher : public os::SuspendedThreadTask { 3669public: 3670 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3671 ExtendedPC result(); 3672protected: 3673 void do_task(const os::SuspendedThreadTaskContext& context); 3674private: 3675 ExtendedPC _epc; 3676}; 3677 3678ExtendedPC PcFetcher::result() { 3679 guarantee(is_done(), "task is not done yet."); 3680 return _epc; 3681} 3682 3683void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3684 Thread* thread = context.thread(); 3685 OSThread* osthread = thread->osthread(); 3686 if (osthread->ucontext() != NULL) { 3687 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); 3688 } else { 3689 // NULL context is unexpected, double-check this is the VMThread 3690 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3691 } 3692} 3693 3694// Suspends the target using the signal mechanism and then grabs the PC before 3695// resuming the target. Used by the flat-profiler only 3696ExtendedPC os::get_thread_pc(Thread* thread) { 3697 // Make sure that it is called by the watcher for the VMThread 3698 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3699 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3700 3701 PcFetcher fetcher(thread); 3702 fetcher.run(); 3703 return fetcher.result(); 3704} 3705 3706int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3707{ 3708 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3709} 3710 3711//////////////////////////////////////////////////////////////////////////////// 3712// debug support 3713 3714bool os::find(address addr, outputStream* st) { 3715 Dl_info dlinfo; 3716 memset(&dlinfo, 0, sizeof(dlinfo)); 3717 if (dladdr(addr, &dlinfo)) { 3718 st->print(PTR_FORMAT ": ", addr); 3719 if (dlinfo.dli_sname != NULL) { 3720 st->print("%s+%#x", dlinfo.dli_sname, 3721 addr - (intptr_t)dlinfo.dli_saddr); 3722 } else if (dlinfo.dli_fname) { 3723 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3724 } else { 3725 st->print("<absolute address>"); 3726 } 3727 if (dlinfo.dli_fname) { 3728 st->print(" in %s", dlinfo.dli_fname); 3729 } 3730 if (dlinfo.dli_fbase) { 3731 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3732 } 3733 st->cr(); 3734 3735 if (Verbose) { 3736 // decode some bytes around the PC 3737 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3738 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3739 address lowest = (address) dlinfo.dli_sname; 3740 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3741 if (begin < lowest) begin = lowest; 3742 Dl_info dlinfo2; 3743 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 3744 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3745 end = (address) dlinfo2.dli_saddr; 3746 Disassembler::decode(begin, end, st); 3747 } 3748 return true; 3749 } 3750 return false; 3751} 3752 3753//////////////////////////////////////////////////////////////////////////////// 3754// misc 3755 3756// This does not do anything on Bsd. This is basically a hook for being 3757// able to use structured exception handling (thread-local exception filters) 3758// on, e.g., Win32. 3759void 3760os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3761 JavaCallArguments* args, Thread* thread) { 3762 f(value, method, args, thread); 3763} 3764 3765void os::print_statistics() { 3766} 3767 3768int os::message_box(const char* title, const char* message) { 3769 int i; 3770 fdStream err(defaultStream::error_fd()); 3771 for (i = 0; i < 78; i++) err.print_raw("="); 3772 err.cr(); 3773 err.print_raw_cr(title); 3774 for (i = 0; i < 78; i++) err.print_raw("-"); 3775 err.cr(); 3776 err.print_raw_cr(message); 3777 for (i = 0; i < 78; i++) err.print_raw("="); 3778 err.cr(); 3779 3780 char buf[16]; 3781 // Prevent process from exiting upon "read error" without consuming all CPU 3782 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3783 3784 return buf[0] == 'y' || buf[0] == 'Y'; 3785} 3786 3787int os::stat(const char *path, struct stat *sbuf) { 3788 char pathbuf[MAX_PATH]; 3789 if (strlen(path) > MAX_PATH - 1) { 3790 errno = ENAMETOOLONG; 3791 return -1; 3792 } 3793 os::native_path(strcpy(pathbuf, path)); 3794 return ::stat(pathbuf, sbuf); 3795} 3796 3797bool os::check_heap(bool force) { 3798 return true; 3799} 3800 3801int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3802 return ::vsnprintf(buf, count, format, args); 3803} 3804 3805// Is a (classpath) directory empty? 3806bool os::dir_is_empty(const char* path) { 3807 DIR *dir = NULL; 3808 struct dirent *ptr; 3809 3810 dir = opendir(path); 3811 if (dir == NULL) return true; 3812 3813 /* Scan the directory */ 3814 bool result = true; 3815 char buf[sizeof(struct dirent) + MAX_PATH]; 3816 while (result && (ptr = ::readdir(dir)) != NULL) { 3817 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3818 result = false; 3819 } 3820 } 3821 closedir(dir); 3822 return result; 3823} 3824 3825// This code originates from JDK's sysOpen and open64_w 3826// from src/solaris/hpi/src/system_md.c 3827 3828#ifndef O_DELETE 3829#define O_DELETE 0x10000 3830#endif 3831 3832// Open a file. Unlink the file immediately after open returns 3833// if the specified oflag has the O_DELETE flag set. 3834// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3835 3836int os::open(const char *path, int oflag, int mode) { 3837 3838 if (strlen(path) > MAX_PATH - 1) { 3839 errno = ENAMETOOLONG; 3840 return -1; 3841 } 3842 int fd; 3843 int o_delete = (oflag & O_DELETE); 3844 oflag = oflag & ~O_DELETE; 3845 3846 fd = ::open(path, oflag, mode); 3847 if (fd == -1) return -1; 3848 3849 //If the open succeeded, the file might still be a directory 3850 { 3851 struct stat buf; 3852 int ret = ::fstat(fd, &buf); 3853 int st_mode = buf.st_mode; 3854 3855 if (ret != -1) { 3856 if ((st_mode & S_IFMT) == S_IFDIR) { 3857 errno = EISDIR; 3858 ::close(fd); 3859 return -1; 3860 } 3861 } else { 3862 ::close(fd); 3863 return -1; 3864 } 3865 } 3866 3867 /* 3868 * All file descriptors that are opened in the JVM and not 3869 * specifically destined for a subprocess should have the 3870 * close-on-exec flag set. If we don't set it, then careless 3rd 3871 * party native code might fork and exec without closing all 3872 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3873 * UNIXProcess.c), and this in turn might: 3874 * 3875 * - cause end-of-file to fail to be detected on some file 3876 * descriptors, resulting in mysterious hangs, or 3877 * 3878 * - might cause an fopen in the subprocess to fail on a system 3879 * suffering from bug 1085341. 3880 * 3881 * (Yes, the default setting of the close-on-exec flag is a Unix 3882 * design flaw) 3883 * 3884 * See: 3885 * 1085341: 32-bit stdio routines should support file descriptors >255 3886 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3887 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3888 */ 3889#ifdef FD_CLOEXEC 3890 { 3891 int flags = ::fcntl(fd, F_GETFD); 3892 if (flags != -1) 3893 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3894 } 3895#endif 3896 3897 if (o_delete != 0) { 3898 ::unlink(path); 3899 } 3900 return fd; 3901} 3902 3903 3904// create binary file, rewriting existing file if required 3905int os::create_binary_file(const char* path, bool rewrite_existing) { 3906 int oflags = O_WRONLY | O_CREAT; 3907 if (!rewrite_existing) { 3908 oflags |= O_EXCL; 3909 } 3910 return ::open(path, oflags, S_IREAD | S_IWRITE); 3911} 3912 3913// return current position of file pointer 3914jlong os::current_file_offset(int fd) { 3915 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3916} 3917 3918// move file pointer to the specified offset 3919jlong os::seek_to_file_offset(int fd, jlong offset) { 3920 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3921} 3922 3923// This code originates from JDK's sysAvailable 3924// from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3925 3926int os::available(int fd, jlong *bytes) { 3927 jlong cur, end; 3928 int mode; 3929 struct stat buf; 3930 3931 if (::fstat(fd, &buf) >= 0) { 3932 mode = buf.st_mode; 3933 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3934 /* 3935 * XXX: is the following call interruptible? If so, this might 3936 * need to go through the INTERRUPT_IO() wrapper as for other 3937 * blocking, interruptible calls in this file. 3938 */ 3939 int n; 3940 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3941 *bytes = n; 3942 return 1; 3943 } 3944 } 3945 } 3946 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3947 return 0; 3948 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3949 return 0; 3950 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3951 return 0; 3952 } 3953 *bytes = end - cur; 3954 return 1; 3955} 3956 3957int os::socket_available(int fd, jint *pbytes) { 3958 if (fd < 0) 3959 return OS_OK; 3960 3961 int ret; 3962 3963 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 3964 3965 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 3966 // is expected to return 0 on failure and 1 on success to the jdk. 3967 3968 return (ret == OS_ERR) ? 0 : 1; 3969} 3970 3971// Map a block of memory. 3972char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3973 char *addr, size_t bytes, bool read_only, 3974 bool allow_exec) { 3975 int prot; 3976 int flags; 3977 3978 if (read_only) { 3979 prot = PROT_READ; 3980 flags = MAP_SHARED; 3981 } else { 3982 prot = PROT_READ | PROT_WRITE; 3983 flags = MAP_PRIVATE; 3984 } 3985 3986 if (allow_exec) { 3987 prot |= PROT_EXEC; 3988 } 3989 3990 if (addr != NULL) { 3991 flags |= MAP_FIXED; 3992 } 3993 3994 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3995 fd, file_offset); 3996 if (mapped_address == MAP_FAILED) { 3997 return NULL; 3998 } 3999 return mapped_address; 4000} 4001 4002 4003// Remap a block of memory. 4004char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4005 char *addr, size_t bytes, bool read_only, 4006 bool allow_exec) { 4007 // same as map_memory() on this OS 4008 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4009 allow_exec); 4010} 4011 4012 4013// Unmap a block of memory. 4014bool os::pd_unmap_memory(char* addr, size_t bytes) { 4015 return munmap(addr, bytes) == 0; 4016} 4017 4018// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4019// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4020// of a thread. 4021// 4022// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4023// the fast estimate available on the platform. 4024 4025jlong os::current_thread_cpu_time() { 4026#ifdef __APPLE__ 4027 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 4028#else 4029 Unimplemented(); 4030 return 0; 4031#endif 4032} 4033 4034jlong os::thread_cpu_time(Thread* thread) { 4035#ifdef __APPLE__ 4036 return os::thread_cpu_time(thread, true /* user + sys */); 4037#else 4038 Unimplemented(); 4039 return 0; 4040#endif 4041} 4042 4043jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4044#ifdef __APPLE__ 4045 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4046#else 4047 Unimplemented(); 4048 return 0; 4049#endif 4050} 4051 4052jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4053#ifdef __APPLE__ 4054 struct thread_basic_info tinfo; 4055 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 4056 kern_return_t kr; 4057 thread_t mach_thread; 4058 4059 mach_thread = thread->osthread()->thread_id(); 4060 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 4061 if (kr != KERN_SUCCESS) 4062 return -1; 4063 4064 if (user_sys_cpu_time) { 4065 jlong nanos; 4066 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 4067 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 4068 return nanos; 4069 } else { 4070 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 4071 } 4072#else 4073 Unimplemented(); 4074 return 0; 4075#endif 4076} 4077 4078 4079void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4080 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4081 info_ptr->may_skip_backward = false; // elapsed time not wall time 4082 info_ptr->may_skip_forward = false; // elapsed time not wall time 4083 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4084} 4085 4086void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4087 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4088 info_ptr->may_skip_backward = false; // elapsed time not wall time 4089 info_ptr->may_skip_forward = false; // elapsed time not wall time 4090 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4091} 4092 4093bool os::is_thread_cpu_time_supported() { 4094#ifdef __APPLE__ 4095 return true; 4096#else 4097 return false; 4098#endif 4099} 4100 4101// System loadavg support. Returns -1 if load average cannot be obtained. 4102// Bsd doesn't yet have a (official) notion of processor sets, 4103// so just return the system wide load average. 4104int os::loadavg(double loadavg[], int nelem) { 4105 return ::getloadavg(loadavg, nelem); 4106} 4107 4108void os::pause() { 4109 char filename[MAX_PATH]; 4110 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4111 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4112 } else { 4113 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4114 } 4115 4116 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4117 if (fd != -1) { 4118 struct stat buf; 4119 ::close(fd); 4120 while (::stat(filename, &buf) == 0) { 4121 (void)::poll(NULL, 0, 100); 4122 } 4123 } else { 4124 jio_fprintf(stderr, 4125 "Could not open pause file '%s', continuing immediately.\n", filename); 4126 } 4127} 4128 4129 4130// Refer to the comments in os_solaris.cpp park-unpark. 4131// 4132// Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 4133// hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 4134// For specifics regarding the bug see GLIBC BUGID 261237 : 4135// http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 4136// Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 4137// will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4138// is used. (The simple C test-case provided in the GLIBC bug report manifests the 4139// hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4140// and monitorenter when we're using 1-0 locking. All those operations may result in 4141// calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4142// of libpthread avoids the problem, but isn't practical. 4143// 4144// Possible remedies: 4145// 4146// 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4147// This is palliative and probabilistic, however. If the thread is preempted 4148// between the call to compute_abstime() and pthread_cond_timedwait(), more 4149// than the minimum period may have passed, and the abstime may be stale (in the 4150// past) resultin in a hang. Using this technique reduces the odds of a hang 4151// but the JVM is still vulnerable, particularly on heavily loaded systems. 4152// 4153// 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4154// of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4155// NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4156// reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4157// thread. 4158// 4159// 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4160// that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4161// a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4162// This also works well. In fact it avoids kernel-level scalability impediments 4163// on certain platforms that don't handle lots of active pthread_cond_timedwait() 4164// timers in a graceful fashion. 4165// 4166// 4. When the abstime value is in the past it appears that control returns 4167// correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4168// Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4169// can avoid the problem by reinitializing the condvar -- by cond_destroy() 4170// followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4171// It may be possible to avoid reinitialization by checking the return 4172// value from pthread_cond_timedwait(). In addition to reinitializing the 4173// condvar we must establish the invariant that cond_signal() is only called 4174// within critical sections protected by the adjunct mutex. This prevents 4175// cond_signal() from "seeing" a condvar that's in the midst of being 4176// reinitialized or that is corrupt. Sadly, this invariant obviates the 4177// desirable signal-after-unlock optimization that avoids futile context switching. 4178// 4179// I'm also concerned that some versions of NTPL might allocate an auxilliary 4180// structure when a condvar is used or initialized. cond_destroy() would 4181// release the helper structure. Our reinitialize-after-timedwait fix 4182// put excessive stress on malloc/free and locks protecting the c-heap. 4183// 4184// We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4185// It may be possible to refine (4) by checking the kernel and NTPL verisons 4186// and only enabling the work-around for vulnerable environments. 4187 4188// utility to compute the abstime argument to timedwait: 4189// millis is the relative timeout time 4190// abstime will be the absolute timeout time 4191// TODO: replace compute_abstime() with unpackTime() 4192 4193static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4194 if (millis < 0) millis = 0; 4195 struct timeval now; 4196 int status = gettimeofday(&now, NULL); 4197 assert(status == 0, "gettimeofday"); 4198 jlong seconds = millis / 1000; 4199 millis %= 1000; 4200 if (seconds > 50000000) { // see man cond_timedwait(3T) 4201 seconds = 50000000; 4202 } 4203 abstime->tv_sec = now.tv_sec + seconds; 4204 long usec = now.tv_usec + millis * 1000; 4205 if (usec >= 1000000) { 4206 abstime->tv_sec += 1; 4207 usec -= 1000000; 4208 } 4209 abstime->tv_nsec = usec * 1000; 4210 return abstime; 4211} 4212 4213 4214// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4215// Conceptually TryPark() should be equivalent to park(0). 4216 4217int os::PlatformEvent::TryPark() { 4218 for (;;) { 4219 const int v = _Event ; 4220 guarantee ((v == 0) || (v == 1), "invariant") ; 4221 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4222 } 4223} 4224 4225void os::PlatformEvent::park() { // AKA "down()" 4226 // Invariant: Only the thread associated with the Event/PlatformEvent 4227 // may call park(). 4228 // TODO: assert that _Assoc != NULL or _Assoc == Self 4229 int v ; 4230 for (;;) { 4231 v = _Event ; 4232 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4233 } 4234 guarantee (v >= 0, "invariant") ; 4235 if (v == 0) { 4236 // Do this the hard way by blocking ... 4237 int status = pthread_mutex_lock(_mutex); 4238 assert_status(status == 0, status, "mutex_lock"); 4239 guarantee (_nParked == 0, "invariant") ; 4240 ++ _nParked ; 4241 while (_Event < 0) { 4242 status = pthread_cond_wait(_cond, _mutex); 4243 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4244 // Treat this the same as if the wait was interrupted 4245 if (status == ETIMEDOUT) { status = EINTR; } 4246 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4247 } 4248 -- _nParked ; 4249 4250 _Event = 0 ; 4251 status = pthread_mutex_unlock(_mutex); 4252 assert_status(status == 0, status, "mutex_unlock"); 4253 // Paranoia to ensure our locked and lock-free paths interact 4254 // correctly with each other. 4255 OrderAccess::fence(); 4256 } 4257 guarantee (_Event >= 0, "invariant") ; 4258} 4259 4260int os::PlatformEvent::park(jlong millis) { 4261 guarantee (_nParked == 0, "invariant") ; 4262 4263 int v ; 4264 for (;;) { 4265 v = _Event ; 4266 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4267 } 4268 guarantee (v >= 0, "invariant") ; 4269 if (v != 0) return OS_OK ; 4270 4271 // We do this the hard way, by blocking the thread. 4272 // Consider enforcing a minimum timeout value. 4273 struct timespec abst; 4274 compute_abstime(&abst, millis); 4275 4276 int ret = OS_TIMEOUT; 4277 int status = pthread_mutex_lock(_mutex); 4278 assert_status(status == 0, status, "mutex_lock"); 4279 guarantee (_nParked == 0, "invariant") ; 4280 ++_nParked ; 4281 4282 // Object.wait(timo) will return because of 4283 // (a) notification 4284 // (b) timeout 4285 // (c) thread.interrupt 4286 // 4287 // Thread.interrupt and object.notify{All} both call Event::set. 4288 // That is, we treat thread.interrupt as a special case of notification. 4289 // The underlying Solaris implementation, cond_timedwait, admits 4290 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4291 // JVM from making those visible to Java code. As such, we must 4292 // filter out spurious wakeups. We assume all ETIME returns are valid. 4293 // 4294 // TODO: properly differentiate simultaneous notify+interrupt. 4295 // In that case, we should propagate the notify to another waiter. 4296 4297 while (_Event < 0) { 4298 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4299 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4300 pthread_cond_destroy (_cond); 4301 pthread_cond_init (_cond, NULL) ; 4302 } 4303 assert_status(status == 0 || status == EINTR || 4304 status == ETIMEDOUT, 4305 status, "cond_timedwait"); 4306 if (!FilterSpuriousWakeups) break ; // previous semantics 4307 if (status == ETIMEDOUT) break ; 4308 // We consume and ignore EINTR and spurious wakeups. 4309 } 4310 --_nParked ; 4311 if (_Event >= 0) { 4312 ret = OS_OK; 4313 } 4314 _Event = 0 ; 4315 status = pthread_mutex_unlock(_mutex); 4316 assert_status(status == 0, status, "mutex_unlock"); 4317 assert (_nParked == 0, "invariant") ; 4318 // Paranoia to ensure our locked and lock-free paths interact 4319 // correctly with each other. 4320 OrderAccess::fence(); 4321 return ret; 4322} 4323 4324void os::PlatformEvent::unpark() { 4325 // Transitions for _Event: 4326 // 0 :=> 1 4327 // 1 :=> 1 4328 // -1 :=> either 0 or 1; must signal target thread 4329 // That is, we can safely transition _Event from -1 to either 4330 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4331 // unpark() calls. 4332 // See also: "Semaphores in Plan 9" by Mullender & Cox 4333 // 4334 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4335 // that it will take two back-to-back park() calls for the owning 4336 // thread to block. This has the benefit of forcing a spurious return 4337 // from the first park() call after an unpark() call which will help 4338 // shake out uses of park() and unpark() without condition variables. 4339 4340 if (Atomic::xchg(1, &_Event) >= 0) return; 4341 4342 // Wait for the thread associated with the event to vacate 4343 int status = pthread_mutex_lock(_mutex); 4344 assert_status(status == 0, status, "mutex_lock"); 4345 int AnyWaiters = _nParked; 4346 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4347 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4348 AnyWaiters = 0; 4349 pthread_cond_signal(_cond); 4350 } 4351 status = pthread_mutex_unlock(_mutex); 4352 assert_status(status == 0, status, "mutex_unlock"); 4353 if (AnyWaiters != 0) { 4354 status = pthread_cond_signal(_cond); 4355 assert_status(status == 0, status, "cond_signal"); 4356 } 4357 4358 // Note that we signal() _after dropping the lock for "immortal" Events. 4359 // This is safe and avoids a common class of futile wakeups. In rare 4360 // circumstances this can cause a thread to return prematurely from 4361 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4362 // simply re-test the condition and re-park itself. 4363} 4364 4365 4366// JSR166 4367// ------------------------------------------------------- 4368 4369/* 4370 * The solaris and bsd implementations of park/unpark are fairly 4371 * conservative for now, but can be improved. They currently use a 4372 * mutex/condvar pair, plus a a count. 4373 * Park decrements count if > 0, else does a condvar wait. Unpark 4374 * sets count to 1 and signals condvar. Only one thread ever waits 4375 * on the condvar. Contention seen when trying to park implies that someone 4376 * is unparking you, so don't wait. And spurious returns are fine, so there 4377 * is no need to track notifications. 4378 */ 4379 4380#define MAX_SECS 100000000 4381/* 4382 * This code is common to bsd and solaris and will be moved to a 4383 * common place in dolphin. 4384 * 4385 * The passed in time value is either a relative time in nanoseconds 4386 * or an absolute time in milliseconds. Either way it has to be unpacked 4387 * into suitable seconds and nanoseconds components and stored in the 4388 * given timespec structure. 4389 * Given time is a 64-bit value and the time_t used in the timespec is only 4390 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4391 * overflow if times way in the future are given. Further on Solaris versions 4392 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4393 * number of seconds, in abstime, is less than current_time + 100,000,000. 4394 * As it will be 28 years before "now + 100000000" will overflow we can 4395 * ignore overflow and just impose a hard-limit on seconds using the value 4396 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4397 * years from "now". 4398 */ 4399 4400static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4401 assert (time > 0, "convertTime"); 4402 4403 struct timeval now; 4404 int status = gettimeofday(&now, NULL); 4405 assert(status == 0, "gettimeofday"); 4406 4407 time_t max_secs = now.tv_sec + MAX_SECS; 4408 4409 if (isAbsolute) { 4410 jlong secs = time / 1000; 4411 if (secs > max_secs) { 4412 absTime->tv_sec = max_secs; 4413 } 4414 else { 4415 absTime->tv_sec = secs; 4416 } 4417 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4418 } 4419 else { 4420 jlong secs = time / NANOSECS_PER_SEC; 4421 if (secs >= MAX_SECS) { 4422 absTime->tv_sec = max_secs; 4423 absTime->tv_nsec = 0; 4424 } 4425 else { 4426 absTime->tv_sec = now.tv_sec + secs; 4427 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4428 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4429 absTime->tv_nsec -= NANOSECS_PER_SEC; 4430 ++absTime->tv_sec; // note: this must be <= max_secs 4431 } 4432 } 4433 } 4434 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4435 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4436 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4437 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4438} 4439 4440void Parker::park(bool isAbsolute, jlong time) { 4441 // Ideally we'd do something useful while spinning, such 4442 // as calling unpackTime(). 4443 4444 // Optional fast-path check: 4445 // Return immediately if a permit is available. 4446 // We depend on Atomic::xchg() having full barrier semantics 4447 // since we are doing a lock-free update to _counter. 4448 if (Atomic::xchg(0, &_counter) > 0) return; 4449 4450 Thread* thread = Thread::current(); 4451 assert(thread->is_Java_thread(), "Must be JavaThread"); 4452 JavaThread *jt = (JavaThread *)thread; 4453 4454 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4455 // Check interrupt before trying to wait 4456 if (Thread::is_interrupted(thread, false)) { 4457 return; 4458 } 4459 4460 // Next, demultiplex/decode time arguments 4461 struct timespec absTime; 4462 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4463 return; 4464 } 4465 if (time > 0) { 4466 unpackTime(&absTime, isAbsolute, time); 4467 } 4468 4469 4470 // Enter safepoint region 4471 // Beware of deadlocks such as 6317397. 4472 // The per-thread Parker:: mutex is a classic leaf-lock. 4473 // In particular a thread must never block on the Threads_lock while 4474 // holding the Parker:: mutex. If safepoints are pending both the 4475 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4476 ThreadBlockInVM tbivm(jt); 4477 4478 // Don't wait if cannot get lock since interference arises from 4479 // unblocking. Also. check interrupt before trying wait 4480 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4481 return; 4482 } 4483 4484 int status ; 4485 if (_counter > 0) { // no wait needed 4486 _counter = 0; 4487 status = pthread_mutex_unlock(_mutex); 4488 assert (status == 0, "invariant") ; 4489 // Paranoia to ensure our locked and lock-free paths interact 4490 // correctly with each other and Java-level accesses. 4491 OrderAccess::fence(); 4492 return; 4493 } 4494 4495#ifdef ASSERT 4496 // Don't catch signals while blocked; let the running threads have the signals. 4497 // (This allows a debugger to break into the running thread.) 4498 sigset_t oldsigs; 4499 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4500 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4501#endif 4502 4503 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4504 jt->set_suspend_equivalent(); 4505 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4506 4507 if (time == 0) { 4508 status = pthread_cond_wait (_cond, _mutex) ; 4509 } else { 4510 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4511 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4512 pthread_cond_destroy (_cond) ; 4513 pthread_cond_init (_cond, NULL); 4514 } 4515 } 4516 assert_status(status == 0 || status == EINTR || 4517 status == ETIMEDOUT, 4518 status, "cond_timedwait"); 4519 4520#ifdef ASSERT 4521 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4522#endif 4523 4524 _counter = 0 ; 4525 status = pthread_mutex_unlock(_mutex) ; 4526 assert_status(status == 0, status, "invariant") ; 4527 // Paranoia to ensure our locked and lock-free paths interact 4528 // correctly with each other and Java-level accesses. 4529 OrderAccess::fence(); 4530 4531 // If externally suspended while waiting, re-suspend 4532 if (jt->handle_special_suspend_equivalent_condition()) { 4533 jt->java_suspend_self(); 4534 } 4535} 4536 4537void Parker::unpark() { 4538 int s, status ; 4539 status = pthread_mutex_lock(_mutex); 4540 assert (status == 0, "invariant") ; 4541 s = _counter; 4542 _counter = 1; 4543 if (s < 1) { 4544 if (WorkAroundNPTLTimedWaitHang) { 4545 status = pthread_cond_signal (_cond) ; 4546 assert (status == 0, "invariant") ; 4547 status = pthread_mutex_unlock(_mutex); 4548 assert (status == 0, "invariant") ; 4549 } else { 4550 status = pthread_mutex_unlock(_mutex); 4551 assert (status == 0, "invariant") ; 4552 status = pthread_cond_signal (_cond) ; 4553 assert (status == 0, "invariant") ; 4554 } 4555 } else { 4556 pthread_mutex_unlock(_mutex); 4557 assert (status == 0, "invariant") ; 4558 } 4559} 4560 4561 4562/* Darwin has no "environ" in a dynamic library. */ 4563#ifdef __APPLE__ 4564#include <crt_externs.h> 4565#define environ (*_NSGetEnviron()) 4566#else 4567extern char** environ; 4568#endif 4569 4570// Run the specified command in a separate process. Return its exit value, 4571// or -1 on failure (e.g. can't fork a new process). 4572// Unlike system(), this function can be called from signal handler. It 4573// doesn't block SIGINT et al. 4574int os::fork_and_exec(char* cmd) { 4575 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4576 4577 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4578 // pthread_atfork handlers and reset pthread library. All we need is a 4579 // separate process to execve. Make a direct syscall to fork process. 4580 // On IA64 there's no fork syscall, we have to use fork() and hope for 4581 // the best... 4582 pid_t pid = fork(); 4583 4584 if (pid < 0) { 4585 // fork failed 4586 return -1; 4587 4588 } else if (pid == 0) { 4589 // child process 4590 4591 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4592 // first to kill every thread on the thread list. Because this list is 4593 // not reset by fork() (see notes above), execve() will instead kill 4594 // every thread in the parent process. We know this is the only thread 4595 // in the new process, so make a system call directly. 4596 // IA64 should use normal execve() from glibc to match the glibc fork() 4597 // above. 4598 execve("/bin/sh", (char* const*)argv, environ); 4599 4600 // execve failed 4601 _exit(-1); 4602 4603 } else { 4604 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4605 // care about the actual exit code, for now. 4606 4607 int status; 4608 4609 // Wait for the child process to exit. This returns immediately if 4610 // the child has already exited. */ 4611 while (waitpid(pid, &status, 0) < 0) { 4612 switch (errno) { 4613 case ECHILD: return 0; 4614 case EINTR: break; 4615 default: return -1; 4616 } 4617 } 4618 4619 if (WIFEXITED(status)) { 4620 // The child exited normally; get its exit code. 4621 return WEXITSTATUS(status); 4622 } else if (WIFSIGNALED(status)) { 4623 // The child exited because of a signal 4624 // The best value to return is 0x80 + signal number, 4625 // because that is what all Unix shells do, and because 4626 // it allows callers to distinguish between process exit and 4627 // process death by signal. 4628 return 0x80 + WTERMSIG(status); 4629 } else { 4630 // Unknown exit code; pass it through 4631 return status; 4632 } 4633 } 4634} 4635 4636// is_headless_jre() 4637// 4638// Test for the existence of xawt/libmawt.so or libawt_xawt.so 4639// in order to report if we are running in a headless jre 4640// 4641// Since JDK8 xawt/libmawt.so was moved into the same directory 4642// as libawt.so, and renamed libawt_xawt.so 4643// 4644bool os::is_headless_jre() { 4645 struct stat statbuf; 4646 char buf[MAXPATHLEN]; 4647 char libmawtpath[MAXPATHLEN]; 4648 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4649 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4650 char *p; 4651 4652 // Get path to libjvm.so 4653 os::jvm_path(buf, sizeof(buf)); 4654 4655 // Get rid of libjvm.so 4656 p = strrchr(buf, '/'); 4657 if (p == NULL) return false; 4658 else *p = '\0'; 4659 4660 // Get rid of client or server 4661 p = strrchr(buf, '/'); 4662 if (p == NULL) return false; 4663 else *p = '\0'; 4664 4665 // check xawt/libmawt.so 4666 strcpy(libmawtpath, buf); 4667 strcat(libmawtpath, xawtstr); 4668 if (::stat(libmawtpath, &statbuf) == 0) return false; 4669 4670 // check libawt_xawt.so 4671 strcpy(libmawtpath, buf); 4672 strcat(libmawtpath, new_xawtstr); 4673 if (::stat(libmawtpath, &statbuf) == 0) return false; 4674 4675 return true; 4676} 4677 4678// Get the default path to the core file 4679// Returns the length of the string 4680int os::get_core_path(char* buffer, size_t bufferSize) { 4681 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4682 4683 // Truncate if theoretical string was longer than bufferSize 4684 n = MIN2(n, (int)bufferSize); 4685 4686 return n; 4687} 4688 4689