os_bsd.cpp revision 4419:754c24457b20
1/* 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// no precompiled headers 26#include "classfile/classLoader.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "classfile/vmSymbols.hpp" 29#include "code/icBuffer.hpp" 30#include "code/vtableStubs.hpp" 31#include "compiler/compileBroker.hpp" 32#include "compiler/disassembler.hpp" 33#include "interpreter/interpreter.hpp" 34#include "jvm_bsd.h" 35#include "memory/allocation.inline.hpp" 36#include "memory/filemap.hpp" 37#include "mutex_bsd.inline.hpp" 38#include "oops/oop.inline.hpp" 39#include "os_share_bsd.hpp" 40#include "prims/jniFastGetField.hpp" 41#include "prims/jvm.h" 42#include "prims/jvm_misc.hpp" 43#include "runtime/arguments.hpp" 44#include "runtime/extendedPC.hpp" 45#include "runtime/globals.hpp" 46#include "runtime/interfaceSupport.hpp" 47#include "runtime/java.hpp" 48#include "runtime/javaCalls.hpp" 49#include "runtime/mutexLocker.hpp" 50#include "runtime/objectMonitor.hpp" 51#include "runtime/osThread.hpp" 52#include "runtime/perfMemory.hpp" 53#include "runtime/sharedRuntime.hpp" 54#include "runtime/statSampler.hpp" 55#include "runtime/stubRoutines.hpp" 56#include "runtime/thread.inline.hpp" 57#include "runtime/threadCritical.hpp" 58#include "runtime/timer.hpp" 59#include "services/attachListener.hpp" 60#include "services/memTracker.hpp" 61#include "services/runtimeService.hpp" 62#include "utilities/decoder.hpp" 63#include "utilities/defaultStream.hpp" 64#include "utilities/events.hpp" 65#include "utilities/growableArray.hpp" 66#include "utilities/vmError.hpp" 67 68// put OS-includes here 69# include <sys/types.h> 70# include <sys/mman.h> 71# include <sys/stat.h> 72# include <sys/select.h> 73# include <pthread.h> 74# include <signal.h> 75# include <errno.h> 76# include <dlfcn.h> 77# include <stdio.h> 78# include <unistd.h> 79# include <sys/resource.h> 80# include <pthread.h> 81# include <sys/stat.h> 82# include <sys/time.h> 83# include <sys/times.h> 84# include <sys/utsname.h> 85# include <sys/socket.h> 86# include <sys/wait.h> 87# include <time.h> 88# include <pwd.h> 89# include <poll.h> 90# include <semaphore.h> 91# include <fcntl.h> 92# include <string.h> 93# include <sys/param.h> 94# include <sys/sysctl.h> 95# include <sys/ipc.h> 96# include <sys/shm.h> 97#ifndef __APPLE__ 98# include <link.h> 99#endif 100# include <stdint.h> 101# include <inttypes.h> 102# include <sys/ioctl.h> 103 104#if defined(__FreeBSD__) || defined(__NetBSD__) 105# include <elf.h> 106#endif 107 108#ifdef __APPLE__ 109# include <mach/mach.h> // semaphore_* API 110# include <mach-o/dyld.h> 111# include <sys/proc_info.h> 112# include <objc/objc-auto.h> 113#endif 114 115#ifndef MAP_ANONYMOUS 116#define MAP_ANONYMOUS MAP_ANON 117#endif 118 119#define MAX_PATH (2 * K) 120 121// for timer info max values which include all bits 122#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 123 124#define LARGEPAGES_BIT (1 << 6) 125//////////////////////////////////////////////////////////////////////////////// 126// global variables 127julong os::Bsd::_physical_memory = 0; 128 129 130int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 131pthread_t os::Bsd::_main_thread; 132int os::Bsd::_page_size = -1; 133 134static jlong initial_time_count=0; 135 136static int clock_tics_per_sec = 100; 137 138// For diagnostics to print a message once. see run_periodic_checks 139static sigset_t check_signal_done; 140static bool check_signals = true; 141 142static pid_t _initial_pid = 0; 143 144/* Signal number used to suspend/resume a thread */ 145 146/* do not use any signal number less than SIGSEGV, see 4355769 */ 147static int SR_signum = SIGUSR2; 148sigset_t SR_sigset; 149 150 151//////////////////////////////////////////////////////////////////////////////// 152// utility functions 153 154static int SR_initialize(); 155static int SR_finalize(); 156 157julong os::available_memory() { 158 return Bsd::available_memory(); 159} 160 161julong os::Bsd::available_memory() { 162 // XXXBSD: this is just a stopgap implementation 163 return physical_memory() >> 2; 164} 165 166julong os::physical_memory() { 167 return Bsd::physical_memory(); 168} 169 170//////////////////////////////////////////////////////////////////////////////// 171// environment support 172 173bool os::getenv(const char* name, char* buf, int len) { 174 const char* val = ::getenv(name); 175 if (val != NULL && strlen(val) < (size_t)len) { 176 strcpy(buf, val); 177 return true; 178 } 179 if (len > 0) buf[0] = 0; // return a null string 180 return false; 181} 182 183 184// Return true if user is running as root. 185 186bool os::have_special_privileges() { 187 static bool init = false; 188 static bool privileges = false; 189 if (!init) { 190 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 191 init = true; 192 } 193 return privileges; 194} 195 196 197 198// Cpu architecture string 199#if defined(ZERO) 200static char cpu_arch[] = ZERO_LIBARCH; 201#elif defined(IA64) 202static char cpu_arch[] = "ia64"; 203#elif defined(IA32) 204static char cpu_arch[] = "i386"; 205#elif defined(AMD64) 206static char cpu_arch[] = "amd64"; 207#elif defined(ARM) 208static char cpu_arch[] = "arm"; 209#elif defined(PPC) 210static char cpu_arch[] = "ppc"; 211#elif defined(SPARC) 212# ifdef _LP64 213static char cpu_arch[] = "sparcv9"; 214# else 215static char cpu_arch[] = "sparc"; 216# endif 217#else 218#error Add appropriate cpu_arch setting 219#endif 220 221// Compiler variant 222#ifdef COMPILER2 223#define COMPILER_VARIANT "server" 224#else 225#define COMPILER_VARIANT "client" 226#endif 227 228 229void os::Bsd::initialize_system_info() { 230 int mib[2]; 231 size_t len; 232 int cpu_val; 233 julong mem_val; 234 235 /* get processors count via hw.ncpus sysctl */ 236 mib[0] = CTL_HW; 237 mib[1] = HW_NCPU; 238 len = sizeof(cpu_val); 239 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 240 assert(len == sizeof(cpu_val), "unexpected data size"); 241 set_processor_count(cpu_val); 242 } 243 else { 244 set_processor_count(1); // fallback 245 } 246 247 /* get physical memory via hw.memsize sysctl (hw.memsize is used 248 * since it returns a 64 bit value) 249 */ 250 mib[0] = CTL_HW; 251 mib[1] = HW_MEMSIZE; 252 len = sizeof(mem_val); 253 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 254 assert(len == sizeof(mem_val), "unexpected data size"); 255 _physical_memory = mem_val; 256 } else { 257 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 258 } 259 260#ifdef __OpenBSD__ 261 { 262 // limit _physical_memory memory view on OpenBSD since 263 // datasize rlimit restricts us anyway. 264 struct rlimit limits; 265 getrlimit(RLIMIT_DATA, &limits); 266 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 267 } 268#endif 269} 270 271#ifdef __APPLE__ 272static const char *get_home() { 273 const char *home_dir = ::getenv("HOME"); 274 if ((home_dir == NULL) || (*home_dir == '\0')) { 275 struct passwd *passwd_info = getpwuid(geteuid()); 276 if (passwd_info != NULL) { 277 home_dir = passwd_info->pw_dir; 278 } 279 } 280 281 return home_dir; 282} 283#endif 284 285void os::init_system_properties_values() { 286// char arch[12]; 287// sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 288 289 // The next steps are taken in the product version: 290 // 291 // Obtain the JAVA_HOME value from the location of libjvm.so. 292 // This library should be located at: 293 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 294 // 295 // If "/jre/lib/" appears at the right place in the path, then we 296 // assume libjvm.so is installed in a JDK and we use this path. 297 // 298 // Otherwise exit with message: "Could not create the Java virtual machine." 299 // 300 // The following extra steps are taken in the debugging version: 301 // 302 // If "/jre/lib/" does NOT appear at the right place in the path 303 // instead of exit check for $JAVA_HOME environment variable. 304 // 305 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 306 // then we append a fake suffix "hotspot/libjvm.so" to this path so 307 // it looks like libjvm.so is installed there 308 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 309 // 310 // Otherwise exit. 311 // 312 // Important note: if the location of libjvm.so changes this 313 // code needs to be changed accordingly. 314 315 // The next few definitions allow the code to be verbatim: 316#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 317#define getenv(n) ::getenv(n) 318 319/* 320 * See ld(1): 321 * The linker uses the following search paths to locate required 322 * shared libraries: 323 * 1: ... 324 * ... 325 * 7: The default directories, normally /lib and /usr/lib. 326 */ 327#ifndef DEFAULT_LIBPATH 328#define DEFAULT_LIBPATH "/lib:/usr/lib" 329#endif 330 331#define EXTENSIONS_DIR "/lib/ext" 332#define ENDORSED_DIR "/lib/endorsed" 333#define REG_DIR "/usr/java/packages" 334 335#ifdef __APPLE__ 336#define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 337#define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 338 const char *user_home_dir = get_home(); 339 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 340 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 341 sizeof(SYS_EXTENSIONS_DIRS); 342#endif 343 344 { 345 /* sysclasspath, java_home, dll_dir */ 346 { 347 char *home_path; 348 char *dll_path; 349 char *pslash; 350 char buf[MAXPATHLEN]; 351 os::jvm_path(buf, sizeof(buf)); 352 353 // Found the full path to libjvm.so. 354 // Now cut the path to <java_home>/jre if we can. 355 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 356 pslash = strrchr(buf, '/'); 357 if (pslash != NULL) 358 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 359 dll_path = malloc(strlen(buf) + 1); 360 if (dll_path == NULL) 361 return; 362 strcpy(dll_path, buf); 363 Arguments::set_dll_dir(dll_path); 364 365 if (pslash != NULL) { 366 pslash = strrchr(buf, '/'); 367 if (pslash != NULL) { 368 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 369#ifndef __APPLE__ 370 pslash = strrchr(buf, '/'); 371 if (pslash != NULL) 372 *pslash = '\0'; /* get rid of /lib */ 373#endif 374 } 375 } 376 377 home_path = malloc(strlen(buf) + 1); 378 if (home_path == NULL) 379 return; 380 strcpy(home_path, buf); 381 Arguments::set_java_home(home_path); 382 383 if (!set_boot_path('/', ':')) 384 return; 385 } 386 387 /* 388 * Where to look for native libraries 389 * 390 * Note: Due to a legacy implementation, most of the library path 391 * is set in the launcher. This was to accomodate linking restrictions 392 * on legacy Bsd implementations (which are no longer supported). 393 * Eventually, all the library path setting will be done here. 394 * 395 * However, to prevent the proliferation of improperly built native 396 * libraries, the new path component /usr/java/packages is added here. 397 * Eventually, all the library path setting will be done here. 398 */ 399 { 400 char *ld_library_path; 401 402 /* 403 * Construct the invariant part of ld_library_path. Note that the 404 * space for the colon and the trailing null are provided by the 405 * nulls included by the sizeof operator (so actually we allocate 406 * a byte more than necessary). 407 */ 408#ifdef __APPLE__ 409 ld_library_path = (char *) malloc(system_ext_size); 410 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 411#else 412 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 413 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 414 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 415#endif 416 417 /* 418 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 419 * should always exist (until the legacy problem cited above is 420 * addressed). 421 */ 422#ifdef __APPLE__ 423 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 424 char *l = getenv("JAVA_LIBRARY_PATH"); 425 if (l != NULL) { 426 char *t = ld_library_path; 427 /* That's +1 for the colon and +1 for the trailing '\0' */ 428 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 429 sprintf(ld_library_path, "%s:%s", l, t); 430 free(t); 431 } 432 433 char *v = getenv("DYLD_LIBRARY_PATH"); 434#else 435 char *v = getenv("LD_LIBRARY_PATH"); 436#endif 437 if (v != NULL) { 438 char *t = ld_library_path; 439 /* That's +1 for the colon and +1 for the trailing '\0' */ 440 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 441 sprintf(ld_library_path, "%s:%s", v, t); 442 free(t); 443 } 444 445#ifdef __APPLE__ 446 // Apple's Java6 has "." at the beginning of java.library.path. 447 // OpenJDK on Windows has "." at the end of java.library.path. 448 // OpenJDK on Linux and Solaris don't have "." in java.library.path 449 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 450 // "." is appended to the end of java.library.path. Yes, this 451 // could cause a change in behavior, but Apple's Java6 behavior 452 // can be achieved by putting "." at the beginning of the 453 // JAVA_LIBRARY_PATH environment variable. 454 { 455 char *t = ld_library_path; 456 // that's +3 for appending ":." and the trailing '\0' 457 ld_library_path = (char *) malloc(strlen(t) + 3); 458 sprintf(ld_library_path, "%s:%s", t, "."); 459 free(t); 460 } 461#endif 462 463 Arguments::set_library_path(ld_library_path); 464 } 465 466 /* 467 * Extensions directories. 468 * 469 * Note that the space for the colon and the trailing null are provided 470 * by the nulls included by the sizeof operator (so actually one byte more 471 * than necessary is allocated). 472 */ 473 { 474#ifdef __APPLE__ 475 char *buf = malloc(strlen(Arguments::get_java_home()) + 476 sizeof(EXTENSIONS_DIR) + system_ext_size); 477 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 478 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 479#else 480 char *buf = malloc(strlen(Arguments::get_java_home()) + 481 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 482 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 483 Arguments::get_java_home()); 484#endif 485 486 Arguments::set_ext_dirs(buf); 487 } 488 489 /* Endorsed standards default directory. */ 490 { 491 char * buf; 492 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 493 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 494 Arguments::set_endorsed_dirs(buf); 495 } 496 } 497 498#ifdef __APPLE__ 499#undef SYS_EXTENSIONS_DIR 500#endif 501#undef malloc 502#undef getenv 503#undef EXTENSIONS_DIR 504#undef ENDORSED_DIR 505 506 // Done 507 return; 508} 509 510//////////////////////////////////////////////////////////////////////////////// 511// breakpoint support 512 513void os::breakpoint() { 514 BREAKPOINT; 515} 516 517extern "C" void breakpoint() { 518 // use debugger to set breakpoint here 519} 520 521//////////////////////////////////////////////////////////////////////////////// 522// signal support 523 524debug_only(static bool signal_sets_initialized = false); 525static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 526 527bool os::Bsd::is_sig_ignored(int sig) { 528 struct sigaction oact; 529 sigaction(sig, (struct sigaction*)NULL, &oact); 530 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 531 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 532 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 533 return true; 534 else 535 return false; 536} 537 538void os::Bsd::signal_sets_init() { 539 // Should also have an assertion stating we are still single-threaded. 540 assert(!signal_sets_initialized, "Already initialized"); 541 // Fill in signals that are necessarily unblocked for all threads in 542 // the VM. Currently, we unblock the following signals: 543 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 544 // by -Xrs (=ReduceSignalUsage)); 545 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 546 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 547 // the dispositions or masks wrt these signals. 548 // Programs embedding the VM that want to use the above signals for their 549 // own purposes must, at this time, use the "-Xrs" option to prevent 550 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 551 // (See bug 4345157, and other related bugs). 552 // In reality, though, unblocking these signals is really a nop, since 553 // these signals are not blocked by default. 554 sigemptyset(&unblocked_sigs); 555 sigemptyset(&allowdebug_blocked_sigs); 556 sigaddset(&unblocked_sigs, SIGILL); 557 sigaddset(&unblocked_sigs, SIGSEGV); 558 sigaddset(&unblocked_sigs, SIGBUS); 559 sigaddset(&unblocked_sigs, SIGFPE); 560 sigaddset(&unblocked_sigs, SR_signum); 561 562 if (!ReduceSignalUsage) { 563 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 564 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 565 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 566 } 567 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 568 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 569 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 570 } 571 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 572 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 573 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 574 } 575 } 576 // Fill in signals that are blocked by all but the VM thread. 577 sigemptyset(&vm_sigs); 578 if (!ReduceSignalUsage) 579 sigaddset(&vm_sigs, BREAK_SIGNAL); 580 debug_only(signal_sets_initialized = true); 581 582} 583 584// These are signals that are unblocked while a thread is running Java. 585// (For some reason, they get blocked by default.) 586sigset_t* os::Bsd::unblocked_signals() { 587 assert(signal_sets_initialized, "Not initialized"); 588 return &unblocked_sigs; 589} 590 591// These are the signals that are blocked while a (non-VM) thread is 592// running Java. Only the VM thread handles these signals. 593sigset_t* os::Bsd::vm_signals() { 594 assert(signal_sets_initialized, "Not initialized"); 595 return &vm_sigs; 596} 597 598// These are signals that are blocked during cond_wait to allow debugger in 599sigset_t* os::Bsd::allowdebug_blocked_signals() { 600 assert(signal_sets_initialized, "Not initialized"); 601 return &allowdebug_blocked_sigs; 602} 603 604void os::Bsd::hotspot_sigmask(Thread* thread) { 605 606 //Save caller's signal mask before setting VM signal mask 607 sigset_t caller_sigmask; 608 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 609 610 OSThread* osthread = thread->osthread(); 611 osthread->set_caller_sigmask(caller_sigmask); 612 613 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 614 615 if (!ReduceSignalUsage) { 616 if (thread->is_VM_thread()) { 617 // Only the VM thread handles BREAK_SIGNAL ... 618 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 619 } else { 620 // ... all other threads block BREAK_SIGNAL 621 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 622 } 623 } 624} 625 626 627////////////////////////////////////////////////////////////////////////////// 628// create new thread 629 630static address highest_vm_reserved_address(); 631 632// check if it's safe to start a new thread 633static bool _thread_safety_check(Thread* thread) { 634 return true; 635} 636 637#ifdef __APPLE__ 638// library handle for calling objc_registerThreadWithCollector() 639// without static linking to the libobjc library 640#define OBJC_LIB "/usr/lib/libobjc.dylib" 641#define OBJC_GCREGISTER "objc_registerThreadWithCollector" 642typedef void (*objc_registerThreadWithCollector_t)(); 643extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 644objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 645#endif 646 647#ifdef __APPLE__ 648static uint64_t locate_unique_thread_id() { 649 // Additional thread_id used to correlate threads in SA 650 thread_identifier_info_data_t m_ident_info; 651 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 652 653 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, 654 (thread_info_t) &m_ident_info, &count); 655 return m_ident_info.thread_id; 656} 657#endif 658 659// Thread start routine for all newly created threads 660static void *java_start(Thread *thread) { 661 // Try to randomize the cache line index of hot stack frames. 662 // This helps when threads of the same stack traces evict each other's 663 // cache lines. The threads can be either from the same JVM instance, or 664 // from different JVM instances. The benefit is especially true for 665 // processors with hyperthreading technology. 666 static int counter = 0; 667 int pid = os::current_process_id(); 668 alloca(((pid ^ counter++) & 7) * 128); 669 670 ThreadLocalStorage::set_thread(thread); 671 672 OSThread* osthread = thread->osthread(); 673 Monitor* sync = osthread->startThread_lock(); 674 675 // non floating stack BsdThreads needs extra check, see above 676 if (!_thread_safety_check(thread)) { 677 // notify parent thread 678 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 679 osthread->set_state(ZOMBIE); 680 sync->notify_all(); 681 return NULL; 682 } 683 684#ifdef __APPLE__ 685 // thread_id is mach thread on macos 686 osthread->set_thread_id(::mach_thread_self()); 687 osthread->set_unique_thread_id(locate_unique_thread_id()); 688#else 689 // thread_id is pthread_id on BSD 690 osthread->set_thread_id(::pthread_self()); 691#endif 692 // initialize signal mask for this thread 693 os::Bsd::hotspot_sigmask(thread); 694 695 // initialize floating point control register 696 os::Bsd::init_thread_fpu_state(); 697 698#ifdef __APPLE__ 699 // register thread with objc gc 700 if (objc_registerThreadWithCollectorFunction != NULL) { 701 objc_registerThreadWithCollectorFunction(); 702 } 703#endif 704 705 // handshaking with parent thread 706 { 707 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 708 709 // notify parent thread 710 osthread->set_state(INITIALIZED); 711 sync->notify_all(); 712 713 // wait until os::start_thread() 714 while (osthread->get_state() == INITIALIZED) { 715 sync->wait(Mutex::_no_safepoint_check_flag); 716 } 717 } 718 719 // call one more level start routine 720 thread->run(); 721 722 return 0; 723} 724 725bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 726 assert(thread->osthread() == NULL, "caller responsible"); 727 728 // Allocate the OSThread object 729 OSThread* osthread = new OSThread(NULL, NULL); 730 if (osthread == NULL) { 731 return false; 732 } 733 734 // set the correct thread state 735 osthread->set_thread_type(thr_type); 736 737 // Initial state is ALLOCATED but not INITIALIZED 738 osthread->set_state(ALLOCATED); 739 740 thread->set_osthread(osthread); 741 742 // init thread attributes 743 pthread_attr_t attr; 744 pthread_attr_init(&attr); 745 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 746 747 // stack size 748 if (os::Bsd::supports_variable_stack_size()) { 749 // calculate stack size if it's not specified by caller 750 if (stack_size == 0) { 751 stack_size = os::Bsd::default_stack_size(thr_type); 752 753 switch (thr_type) { 754 case os::java_thread: 755 // Java threads use ThreadStackSize which default value can be 756 // changed with the flag -Xss 757 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 758 stack_size = JavaThread::stack_size_at_create(); 759 break; 760 case os::compiler_thread: 761 if (CompilerThreadStackSize > 0) { 762 stack_size = (size_t)(CompilerThreadStackSize * K); 763 break; 764 } // else fall through: 765 // use VMThreadStackSize if CompilerThreadStackSize is not defined 766 case os::vm_thread: 767 case os::pgc_thread: 768 case os::cgc_thread: 769 case os::watcher_thread: 770 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 771 break; 772 } 773 } 774 775 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 776 pthread_attr_setstacksize(&attr, stack_size); 777 } else { 778 // let pthread_create() pick the default value. 779 } 780 781 ThreadState state; 782 783 { 784 pthread_t tid; 785 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 786 787 pthread_attr_destroy(&attr); 788 789 if (ret != 0) { 790 if (PrintMiscellaneous && (Verbose || WizardMode)) { 791 perror("pthread_create()"); 792 } 793 // Need to clean up stuff we've allocated so far 794 thread->set_osthread(NULL); 795 delete osthread; 796 return false; 797 } 798 799 // Store pthread info into the OSThread 800 osthread->set_pthread_id(tid); 801 802 // Wait until child thread is either initialized or aborted 803 { 804 Monitor* sync_with_child = osthread->startThread_lock(); 805 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 806 while ((state = osthread->get_state()) == ALLOCATED) { 807 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 808 } 809 } 810 811 } 812 813 // Aborted due to thread limit being reached 814 if (state == ZOMBIE) { 815 thread->set_osthread(NULL); 816 delete osthread; 817 return false; 818 } 819 820 // The thread is returned suspended (in state INITIALIZED), 821 // and is started higher up in the call chain 822 assert(state == INITIALIZED, "race condition"); 823 return true; 824} 825 826///////////////////////////////////////////////////////////////////////////// 827// attach existing thread 828 829// bootstrap the main thread 830bool os::create_main_thread(JavaThread* thread) { 831 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 832 return create_attached_thread(thread); 833} 834 835bool os::create_attached_thread(JavaThread* thread) { 836#ifdef ASSERT 837 thread->verify_not_published(); 838#endif 839 840 // Allocate the OSThread object 841 OSThread* osthread = new OSThread(NULL, NULL); 842 843 if (osthread == NULL) { 844 return false; 845 } 846 847 // Store pthread info into the OSThread 848#ifdef __APPLE__ 849 osthread->set_thread_id(::mach_thread_self()); 850 osthread->set_unique_thread_id(locate_unique_thread_id()); 851#else 852 osthread->set_thread_id(::pthread_self()); 853#endif 854 osthread->set_pthread_id(::pthread_self()); 855 856 // initialize floating point control register 857 os::Bsd::init_thread_fpu_state(); 858 859 // Initial thread state is RUNNABLE 860 osthread->set_state(RUNNABLE); 861 862 thread->set_osthread(osthread); 863 864 // initialize signal mask for this thread 865 // and save the caller's signal mask 866 os::Bsd::hotspot_sigmask(thread); 867 868 return true; 869} 870 871void os::pd_start_thread(Thread* thread) { 872 OSThread * osthread = thread->osthread(); 873 assert(osthread->get_state() != INITIALIZED, "just checking"); 874 Monitor* sync_with_child = osthread->startThread_lock(); 875 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 876 sync_with_child->notify(); 877} 878 879// Free Bsd resources related to the OSThread 880void os::free_thread(OSThread* osthread) { 881 assert(osthread != NULL, "osthread not set"); 882 883 if (Thread::current()->osthread() == osthread) { 884 // Restore caller's signal mask 885 sigset_t sigmask = osthread->caller_sigmask(); 886 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 887 } 888 889 delete osthread; 890} 891 892////////////////////////////////////////////////////////////////////////////// 893// thread local storage 894 895int os::allocate_thread_local_storage() { 896 pthread_key_t key; 897 int rslt = pthread_key_create(&key, NULL); 898 assert(rslt == 0, "cannot allocate thread local storage"); 899 return (int)key; 900} 901 902// Note: This is currently not used by VM, as we don't destroy TLS key 903// on VM exit. 904void os::free_thread_local_storage(int index) { 905 int rslt = pthread_key_delete((pthread_key_t)index); 906 assert(rslt == 0, "invalid index"); 907} 908 909void os::thread_local_storage_at_put(int index, void* value) { 910 int rslt = pthread_setspecific((pthread_key_t)index, value); 911 assert(rslt == 0, "pthread_setspecific failed"); 912} 913 914extern "C" Thread* get_thread() { 915 return ThreadLocalStorage::thread(); 916} 917 918 919//////////////////////////////////////////////////////////////////////////////// 920// time support 921 922// Time since start-up in seconds to a fine granularity. 923// Used by VMSelfDestructTimer and the MemProfiler. 924double os::elapsedTime() { 925 926 return (double)(os::elapsed_counter()) * 0.000001; 927} 928 929jlong os::elapsed_counter() { 930 timeval time; 931 int status = gettimeofday(&time, NULL); 932 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 933} 934 935jlong os::elapsed_frequency() { 936 return (1000 * 1000); 937} 938 939// XXX: For now, code this as if BSD does not support vtime. 940bool os::supports_vtime() { return false; } 941bool os::enable_vtime() { return false; } 942bool os::vtime_enabled() { return false; } 943double os::elapsedVTime() { 944 // better than nothing, but not much 945 return elapsedTime(); 946} 947 948jlong os::javaTimeMillis() { 949 timeval time; 950 int status = gettimeofday(&time, NULL); 951 assert(status != -1, "bsd error"); 952 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 953} 954 955#ifndef CLOCK_MONOTONIC 956#define CLOCK_MONOTONIC (1) 957#endif 958 959#ifdef __APPLE__ 960void os::Bsd::clock_init() { 961 // XXXDARWIN: Investigate replacement monotonic clock 962} 963#else 964void os::Bsd::clock_init() { 965 struct timespec res; 966 struct timespec tp; 967 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 968 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 969 // yes, monotonic clock is supported 970 _clock_gettime = ::clock_gettime; 971 } 972} 973#endif 974 975 976jlong os::javaTimeNanos() { 977 if (Bsd::supports_monotonic_clock()) { 978 struct timespec tp; 979 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 980 assert(status == 0, "gettime error"); 981 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 982 return result; 983 } else { 984 timeval time; 985 int status = gettimeofday(&time, NULL); 986 assert(status != -1, "bsd error"); 987 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 988 return 1000 * usecs; 989 } 990} 991 992void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 993 if (Bsd::supports_monotonic_clock()) { 994 info_ptr->max_value = ALL_64_BITS; 995 996 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 997 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 998 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 999 } else { 1000 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1001 info_ptr->max_value = ALL_64_BITS; 1002 1003 // gettimeofday is a real time clock so it skips 1004 info_ptr->may_skip_backward = true; 1005 info_ptr->may_skip_forward = true; 1006 } 1007 1008 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1009} 1010 1011// Return the real, user, and system times in seconds from an 1012// arbitrary fixed point in the past. 1013bool os::getTimesSecs(double* process_real_time, 1014 double* process_user_time, 1015 double* process_system_time) { 1016 struct tms ticks; 1017 clock_t real_ticks = times(&ticks); 1018 1019 if (real_ticks == (clock_t) (-1)) { 1020 return false; 1021 } else { 1022 double ticks_per_second = (double) clock_tics_per_sec; 1023 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1024 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1025 *process_real_time = ((double) real_ticks) / ticks_per_second; 1026 1027 return true; 1028 } 1029} 1030 1031 1032char * os::local_time_string(char *buf, size_t buflen) { 1033 struct tm t; 1034 time_t long_time; 1035 time(&long_time); 1036 localtime_r(&long_time, &t); 1037 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1038 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1039 t.tm_hour, t.tm_min, t.tm_sec); 1040 return buf; 1041} 1042 1043struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1044 return localtime_r(clock, res); 1045} 1046 1047//////////////////////////////////////////////////////////////////////////////// 1048// runtime exit support 1049 1050// Note: os::shutdown() might be called very early during initialization, or 1051// called from signal handler. Before adding something to os::shutdown(), make 1052// sure it is async-safe and can handle partially initialized VM. 1053void os::shutdown() { 1054 1055 // allow PerfMemory to attempt cleanup of any persistent resources 1056 perfMemory_exit(); 1057 1058 // needs to remove object in file system 1059 AttachListener::abort(); 1060 1061 // flush buffered output, finish log files 1062 ostream_abort(); 1063 1064 // Check for abort hook 1065 abort_hook_t abort_hook = Arguments::abort_hook(); 1066 if (abort_hook != NULL) { 1067 abort_hook(); 1068 } 1069 1070} 1071 1072// Note: os::abort() might be called very early during initialization, or 1073// called from signal handler. Before adding something to os::abort(), make 1074// sure it is async-safe and can handle partially initialized VM. 1075void os::abort(bool dump_core) { 1076 os::shutdown(); 1077 if (dump_core) { 1078#ifndef PRODUCT 1079 fdStream out(defaultStream::output_fd()); 1080 out.print_raw("Current thread is "); 1081 char buf[16]; 1082 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1083 out.print_raw_cr(buf); 1084 out.print_raw_cr("Dumping core ..."); 1085#endif 1086 ::abort(); // dump core 1087 } 1088 1089 ::exit(1); 1090} 1091 1092// Die immediately, no exit hook, no abort hook, no cleanup. 1093void os::die() { 1094 // _exit() on BsdThreads only kills current thread 1095 ::abort(); 1096} 1097 1098// unused on bsd for now. 1099void os::set_error_file(const char *logfile) {} 1100 1101 1102// This method is a copy of JDK's sysGetLastErrorString 1103// from src/solaris/hpi/src/system_md.c 1104 1105size_t os::lasterror(char *buf, size_t len) { 1106 1107 if (errno == 0) return 0; 1108 1109 const char *s = ::strerror(errno); 1110 size_t n = ::strlen(s); 1111 if (n >= len) { 1112 n = len - 1; 1113 } 1114 ::strncpy(buf, s, n); 1115 buf[n] = '\0'; 1116 return n; 1117} 1118 1119intx os::current_thread_id() { 1120#ifdef __APPLE__ 1121 return (intx)::mach_thread_self(); 1122#else 1123 return (intx)::pthread_self(); 1124#endif 1125} 1126int os::current_process_id() { 1127 1128 // Under the old bsd thread library, bsd gives each thread 1129 // its own process id. Because of this each thread will return 1130 // a different pid if this method were to return the result 1131 // of getpid(2). Bsd provides no api that returns the pid 1132 // of the launcher thread for the vm. This implementation 1133 // returns a unique pid, the pid of the launcher thread 1134 // that starts the vm 'process'. 1135 1136 // Under the NPTL, getpid() returns the same pid as the 1137 // launcher thread rather than a unique pid per thread. 1138 // Use gettid() if you want the old pre NPTL behaviour. 1139 1140 // if you are looking for the result of a call to getpid() that 1141 // returns a unique pid for the calling thread, then look at the 1142 // OSThread::thread_id() method in osThread_bsd.hpp file 1143 1144 return (int)(_initial_pid ? _initial_pid : getpid()); 1145} 1146 1147// DLL functions 1148 1149#define JNI_LIB_PREFIX "lib" 1150#ifdef __APPLE__ 1151#define JNI_LIB_SUFFIX ".dylib" 1152#else 1153#define JNI_LIB_SUFFIX ".so" 1154#endif 1155 1156const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1157 1158// This must be hard coded because it's the system's temporary 1159// directory not the java application's temp directory, ala java.io.tmpdir. 1160#ifdef __APPLE__ 1161// macosx has a secure per-user temporary directory 1162char temp_path_storage[PATH_MAX]; 1163const char* os::get_temp_directory() { 1164 static char *temp_path = NULL; 1165 if (temp_path == NULL) { 1166 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1167 if (pathSize == 0 || pathSize > PATH_MAX) { 1168 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1169 } 1170 temp_path = temp_path_storage; 1171 } 1172 return temp_path; 1173} 1174#else /* __APPLE__ */ 1175const char* os::get_temp_directory() { return "/tmp"; } 1176#endif /* __APPLE__ */ 1177 1178static bool file_exists(const char* filename) { 1179 struct stat statbuf; 1180 if (filename == NULL || strlen(filename) == 0) { 1181 return false; 1182 } 1183 return os::stat(filename, &statbuf) == 0; 1184} 1185 1186bool os::dll_build_name(char* buffer, size_t buflen, 1187 const char* pname, const char* fname) { 1188 bool retval = false; 1189 // Copied from libhpi 1190 const size_t pnamelen = pname ? strlen(pname) : 0; 1191 1192 // Return error on buffer overflow. 1193 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1194 return retval; 1195 } 1196 1197 if (pnamelen == 0) { 1198 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1199 retval = true; 1200 } else if (strchr(pname, *os::path_separator()) != NULL) { 1201 int n; 1202 char** pelements = split_path(pname, &n); 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 1231const char* os::get_current_directory(char *buf, int buflen) { 1232 return getcwd(buf, buflen); 1233} 1234 1235// check if addr is inside libjvm.so 1236bool os::address_is_in_vm(address addr) { 1237 static address libjvm_base_addr; 1238 Dl_info dlinfo; 1239 1240 if (libjvm_base_addr == NULL) { 1241 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1242 libjvm_base_addr = (address)dlinfo.dli_fbase; 1243 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1244 } 1245 1246 if (dladdr((void *)addr, &dlinfo)) { 1247 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1248 } 1249 1250 return false; 1251} 1252 1253 1254#define MACH_MAXSYMLEN 256 1255 1256bool os::dll_address_to_function_name(address addr, char *buf, 1257 int buflen, int *offset) { 1258 Dl_info dlinfo; 1259 char localbuf[MACH_MAXSYMLEN]; 1260 1261 // dladdr will find names of dynamic functions only, but does 1262 // it set dli_fbase with mach_header address when it "fails" ? 1263 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1264 if (buf != NULL) { 1265 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1266 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1267 } 1268 } 1269 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1270 return true; 1271 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1272 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1273 buf, buflen, offset, dlinfo.dli_fname)) { 1274 return true; 1275 } 1276 } 1277 1278 // Handle non-dymanic manually: 1279 if (dlinfo.dli_fbase != NULL && 1280 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { 1281 if(!Decoder::demangle(localbuf, buf, buflen)) { 1282 jio_snprintf(buf, buflen, "%s", localbuf); 1283 } 1284 return true; 1285 } 1286 if (buf != NULL) buf[0] = '\0'; 1287 if (offset != NULL) *offset = -1; 1288 return false; 1289} 1290 1291// ported from solaris version 1292bool os::dll_address_to_library_name(address addr, char* buf, 1293 int buflen, int* offset) { 1294 Dl_info dlinfo; 1295 1296 if (dladdr((void*)addr, &dlinfo)){ 1297 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1298 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1299 return true; 1300 } else { 1301 if (buf) buf[0] = '\0'; 1302 if (offset) *offset = -1; 1303 return false; 1304 } 1305} 1306 1307// Loads .dll/.so and 1308// in case of error it checks if .dll/.so was built for the 1309// same architecture as Hotspot is running on 1310 1311#ifdef __APPLE__ 1312void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1313 void * result= ::dlopen(filename, RTLD_LAZY); 1314 if (result != NULL) { 1315 // Successful loading 1316 return result; 1317 } 1318 1319 // Read system error message into ebuf 1320 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1321 ebuf[ebuflen-1]='\0'; 1322 1323 return NULL; 1324} 1325#else 1326void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1327{ 1328 void * result= ::dlopen(filename, RTLD_LAZY); 1329 if (result != NULL) { 1330 // Successful loading 1331 return result; 1332 } 1333 1334 Elf32_Ehdr elf_head; 1335 1336 // Read system error message into ebuf 1337 // It may or may not be overwritten below 1338 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1339 ebuf[ebuflen-1]='\0'; 1340 int diag_msg_max_length=ebuflen-strlen(ebuf); 1341 char* diag_msg_buf=ebuf+strlen(ebuf); 1342 1343 if (diag_msg_max_length==0) { 1344 // No more space in ebuf for additional diagnostics message 1345 return NULL; 1346 } 1347 1348 1349 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1350 1351 if (file_descriptor < 0) { 1352 // Can't open library, report dlerror() message 1353 return NULL; 1354 } 1355 1356 bool failed_to_read_elf_head= 1357 (sizeof(elf_head)!= 1358 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1359 1360 ::close(file_descriptor); 1361 if (failed_to_read_elf_head) { 1362 // file i/o error - report dlerror() msg 1363 return NULL; 1364 } 1365 1366 typedef struct { 1367 Elf32_Half code; // Actual value as defined in elf.h 1368 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1369 char elf_class; // 32 or 64 bit 1370 char endianess; // MSB or LSB 1371 char* name; // String representation 1372 } arch_t; 1373 1374 #ifndef EM_486 1375 #define EM_486 6 /* Intel 80486 */ 1376 #endif 1377 1378 #ifndef EM_MIPS_RS3_LE 1379 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1380 #endif 1381 1382 #ifndef EM_PPC64 1383 #define EM_PPC64 21 /* PowerPC64 */ 1384 #endif 1385 1386 #ifndef EM_S390 1387 #define EM_S390 22 /* IBM System/390 */ 1388 #endif 1389 1390 #ifndef EM_IA_64 1391 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1392 #endif 1393 1394 #ifndef EM_X86_64 1395 #define EM_X86_64 62 /* AMD x86-64 */ 1396 #endif 1397 1398 static const arch_t arch_array[]={ 1399 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1400 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1401 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1402 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1403 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1404 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1405 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1406 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1407 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1408 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1409 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1410 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1411 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1412 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1413 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1414 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1415 }; 1416 1417 #if (defined IA32) 1418 static Elf32_Half running_arch_code=EM_386; 1419 #elif (defined AMD64) 1420 static Elf32_Half running_arch_code=EM_X86_64; 1421 #elif (defined IA64) 1422 static Elf32_Half running_arch_code=EM_IA_64; 1423 #elif (defined __sparc) && (defined _LP64) 1424 static Elf32_Half running_arch_code=EM_SPARCV9; 1425 #elif (defined __sparc) && (!defined _LP64) 1426 static Elf32_Half running_arch_code=EM_SPARC; 1427 #elif (defined __powerpc64__) 1428 static Elf32_Half running_arch_code=EM_PPC64; 1429 #elif (defined __powerpc__) 1430 static Elf32_Half running_arch_code=EM_PPC; 1431 #elif (defined ARM) 1432 static Elf32_Half running_arch_code=EM_ARM; 1433 #elif (defined S390) 1434 static Elf32_Half running_arch_code=EM_S390; 1435 #elif (defined ALPHA) 1436 static Elf32_Half running_arch_code=EM_ALPHA; 1437 #elif (defined MIPSEL) 1438 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1439 #elif (defined PARISC) 1440 static Elf32_Half running_arch_code=EM_PARISC; 1441 #elif (defined MIPS) 1442 static Elf32_Half running_arch_code=EM_MIPS; 1443 #elif (defined M68K) 1444 static Elf32_Half running_arch_code=EM_68K; 1445 #else 1446 #error Method os::dll_load requires that one of following is defined:\ 1447 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1448 #endif 1449 1450 // Identify compatability class for VM's architecture and library's architecture 1451 // Obtain string descriptions for architectures 1452 1453 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1454 int running_arch_index=-1; 1455 1456 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1457 if (running_arch_code == arch_array[i].code) { 1458 running_arch_index = i; 1459 } 1460 if (lib_arch.code == arch_array[i].code) { 1461 lib_arch.compat_class = arch_array[i].compat_class; 1462 lib_arch.name = arch_array[i].name; 1463 } 1464 } 1465 1466 assert(running_arch_index != -1, 1467 "Didn't find running architecture code (running_arch_code) in arch_array"); 1468 if (running_arch_index == -1) { 1469 // Even though running architecture detection failed 1470 // we may still continue with reporting dlerror() message 1471 return NULL; 1472 } 1473 1474 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1475 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1476 return NULL; 1477 } 1478 1479#ifndef S390 1480 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1481 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1482 return NULL; 1483 } 1484#endif // !S390 1485 1486 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1487 if ( lib_arch.name!=NULL ) { 1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1489 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1490 lib_arch.name, arch_array[running_arch_index].name); 1491 } else { 1492 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1493 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1494 lib_arch.code, 1495 arch_array[running_arch_index].name); 1496 } 1497 } 1498 1499 return NULL; 1500} 1501#endif /* !__APPLE__ */ 1502 1503// XXX: Do we need a lock around this as per Linux? 1504void* os::dll_lookup(void* handle, const char* name) { 1505 return dlsym(handle, name); 1506} 1507 1508 1509static bool _print_ascii_file(const char* filename, outputStream* st) { 1510 int fd = ::open(filename, O_RDONLY); 1511 if (fd == -1) { 1512 return false; 1513 } 1514 1515 char buf[32]; 1516 int bytes; 1517 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1518 st->print_raw(buf, bytes); 1519 } 1520 1521 ::close(fd); 1522 1523 return true; 1524} 1525 1526void os::print_dll_info(outputStream *st) { 1527 st->print_cr("Dynamic libraries:"); 1528#ifdef RTLD_DI_LINKMAP 1529 Dl_info dli; 1530 void *handle; 1531 Link_map *map; 1532 Link_map *p; 1533 1534 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1535 st->print_cr("Error: Cannot print dynamic libraries."); 1536 return; 1537 } 1538 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1539 if (handle == NULL) { 1540 st->print_cr("Error: Cannot print dynamic libraries."); 1541 return; 1542 } 1543 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1544 if (map == NULL) { 1545 st->print_cr("Error: Cannot print dynamic libraries."); 1546 return; 1547 } 1548 1549 while (map->l_prev != NULL) 1550 map = map->l_prev; 1551 1552 while (map != NULL) { 1553 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1554 map = map->l_next; 1555 } 1556 1557 dlclose(handle); 1558#elif defined(__APPLE__) 1559 uint32_t count; 1560 uint32_t i; 1561 1562 count = _dyld_image_count(); 1563 for (i = 1; i < count; i++) { 1564 const char *name = _dyld_get_image_name(i); 1565 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1566 st->print_cr(PTR_FORMAT " \t%s", slide, name); 1567 } 1568#else 1569 st->print_cr("Error: Cannot print dynamic libraries."); 1570#endif 1571} 1572 1573void os::print_os_info_brief(outputStream* st) { 1574 st->print("Bsd"); 1575 1576 os::Posix::print_uname_info(st); 1577} 1578 1579void os::print_os_info(outputStream* st) { 1580 st->print("OS:"); 1581 st->print("Bsd"); 1582 1583 os::Posix::print_uname_info(st); 1584 1585 os::Posix::print_rlimit_info(st); 1586 1587 os::Posix::print_load_average(st); 1588} 1589 1590void os::pd_print_cpu_info(outputStream* st) { 1591 // Nothing to do for now. 1592} 1593 1594void os::print_memory_info(outputStream* st) { 1595 1596 st->print("Memory:"); 1597 st->print(" %dk page", os::vm_page_size()>>10); 1598 1599 st->print(", physical " UINT64_FORMAT "k", 1600 os::physical_memory() >> 10); 1601 st->print("(" UINT64_FORMAT "k free)", 1602 os::available_memory() >> 10); 1603 st->cr(); 1604 1605 // meminfo 1606 st->print("\n/proc/meminfo:\n"); 1607 _print_ascii_file("/proc/meminfo", st); 1608 st->cr(); 1609} 1610 1611// Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1612// but they're the same for all the bsd arch that we support 1613// and they're the same for solaris but there's no common place to put this. 1614const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1615 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1616 "ILL_COPROC", "ILL_BADSTK" }; 1617 1618const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1619 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1620 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1621 1622const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1623 1624const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1625 1626void os::print_siginfo(outputStream* st, void* siginfo) { 1627 st->print("siginfo:"); 1628 1629 const int buflen = 100; 1630 char buf[buflen]; 1631 siginfo_t *si = (siginfo_t*)siginfo; 1632 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1633 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1634 st->print("si_errno=%s", buf); 1635 } else { 1636 st->print("si_errno=%d", si->si_errno); 1637 } 1638 const int c = si->si_code; 1639 assert(c > 0, "unexpected si_code"); 1640 switch (si->si_signo) { 1641 case SIGILL: 1642 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1643 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1644 break; 1645 case SIGFPE: 1646 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1647 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1648 break; 1649 case SIGSEGV: 1650 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1651 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1652 break; 1653 case SIGBUS: 1654 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1655 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1656 break; 1657 default: 1658 st->print(", si_code=%d", si->si_code); 1659 // no si_addr 1660 } 1661 1662 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1663 UseSharedSpaces) { 1664 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1665 if (mapinfo->is_in_shared_space(si->si_addr)) { 1666 st->print("\n\nError accessing class data sharing archive." \ 1667 " Mapped file inaccessible during execution, " \ 1668 " possible disk/network problem."); 1669 } 1670 } 1671 st->cr(); 1672} 1673 1674 1675static void print_signal_handler(outputStream* st, int sig, 1676 char* buf, size_t buflen); 1677 1678void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1679 st->print_cr("Signal Handlers:"); 1680 print_signal_handler(st, SIGSEGV, buf, buflen); 1681 print_signal_handler(st, SIGBUS , buf, buflen); 1682 print_signal_handler(st, SIGFPE , buf, buflen); 1683 print_signal_handler(st, SIGPIPE, buf, buflen); 1684 print_signal_handler(st, SIGXFSZ, buf, buflen); 1685 print_signal_handler(st, SIGILL , buf, buflen); 1686 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1687 print_signal_handler(st, SR_signum, buf, buflen); 1688 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1689 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1690 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1691 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1692} 1693 1694static char saved_jvm_path[MAXPATHLEN] = {0}; 1695 1696// Find the full path to the current module, libjvm 1697void os::jvm_path(char *buf, jint buflen) { 1698 // Error checking. 1699 if (buflen < MAXPATHLEN) { 1700 assert(false, "must use a large-enough buffer"); 1701 buf[0] = '\0'; 1702 return; 1703 } 1704 // Lazy resolve the path to current module. 1705 if (saved_jvm_path[0] != 0) { 1706 strcpy(buf, saved_jvm_path); 1707 return; 1708 } 1709 1710 char dli_fname[MAXPATHLEN]; 1711 bool ret = dll_address_to_library_name( 1712 CAST_FROM_FN_PTR(address, os::jvm_path), 1713 dli_fname, sizeof(dli_fname), NULL); 1714 assert(ret != 0, "cannot locate libjvm"); 1715 char *rp = realpath(dli_fname, buf); 1716 if (rp == NULL) 1717 return; 1718 1719 if (Arguments::created_by_gamma_launcher()) { 1720 // Support for the gamma launcher. Typical value for buf is 1721 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1722 // the right place in the string, then assume we are installed in a JDK and 1723 // we're done. Otherwise, check for a JAVA_HOME environment variable and 1724 // construct a path to the JVM being overridden. 1725 1726 const char *p = buf + strlen(buf) - 1; 1727 for (int count = 0; p > buf && count < 5; ++count) { 1728 for (--p; p > buf && *p != '/'; --p) 1729 /* empty */ ; 1730 } 1731 1732 if (strncmp(p, "/jre/lib/", 9) != 0) { 1733 // Look for JAVA_HOME in the environment. 1734 char* java_home_var = ::getenv("JAVA_HOME"); 1735 if (java_home_var != NULL && java_home_var[0] != 0) { 1736 char* jrelib_p; 1737 int len; 1738 1739 // Check the current module name "libjvm" 1740 p = strrchr(buf, '/'); 1741 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1742 1743 rp = realpath(java_home_var, buf); 1744 if (rp == NULL) 1745 return; 1746 1747 // determine if this is a legacy image or modules image 1748 // modules image doesn't have "jre" subdirectory 1749 len = strlen(buf); 1750 jrelib_p = buf + len; 1751 1752 // Add the appropriate library subdir 1753 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1754 if (0 != access(buf, F_OK)) { 1755 snprintf(jrelib_p, buflen-len, "/lib"); 1756 } 1757 1758 // Add the appropriate client or server subdir 1759 len = strlen(buf); 1760 jrelib_p = buf + len; 1761 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1762 if (0 != access(buf, F_OK)) { 1763 snprintf(jrelib_p, buflen-len, ""); 1764 } 1765 1766 // If the path exists within JAVA_HOME, add the JVM library name 1767 // to complete the path to JVM being overridden. Otherwise fallback 1768 // to the path to the current library. 1769 if (0 == access(buf, F_OK)) { 1770 // Use current module name "libjvm" 1771 len = strlen(buf); 1772 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1773 } else { 1774 // Fall back to path of current library 1775 rp = realpath(dli_fname, buf); 1776 if (rp == NULL) 1777 return; 1778 } 1779 } 1780 } 1781 } 1782 1783 strcpy(saved_jvm_path, buf); 1784} 1785 1786void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1787 // no prefix required, not even "_" 1788} 1789 1790void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1791 // no suffix required 1792} 1793 1794//////////////////////////////////////////////////////////////////////////////// 1795// sun.misc.Signal support 1796 1797static volatile jint sigint_count = 0; 1798 1799static void 1800UserHandler(int sig, void *siginfo, void *context) { 1801 // 4511530 - sem_post is serialized and handled by the manager thread. When 1802 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1803 // don't want to flood the manager thread with sem_post requests. 1804 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1805 return; 1806 1807 // Ctrl-C is pressed during error reporting, likely because the error 1808 // handler fails to abort. Let VM die immediately. 1809 if (sig == SIGINT && is_error_reported()) { 1810 os::die(); 1811 } 1812 1813 os::signal_notify(sig); 1814} 1815 1816void* os::user_handler() { 1817 return CAST_FROM_FN_PTR(void*, UserHandler); 1818} 1819 1820extern "C" { 1821 typedef void (*sa_handler_t)(int); 1822 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1823} 1824 1825void* os::signal(int signal_number, void* handler) { 1826 struct sigaction sigAct, oldSigAct; 1827 1828 sigfillset(&(sigAct.sa_mask)); 1829 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1830 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1831 1832 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1833 // -1 means registration failed 1834 return (void *)-1; 1835 } 1836 1837 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1838} 1839 1840void os::signal_raise(int signal_number) { 1841 ::raise(signal_number); 1842} 1843 1844/* 1845 * The following code is moved from os.cpp for making this 1846 * code platform specific, which it is by its very nature. 1847 */ 1848 1849// Will be modified when max signal is changed to be dynamic 1850int os::sigexitnum_pd() { 1851 return NSIG; 1852} 1853 1854// a counter for each possible signal value 1855static volatile jint pending_signals[NSIG+1] = { 0 }; 1856 1857// Bsd(POSIX) specific hand shaking semaphore. 1858#ifdef __APPLE__ 1859static semaphore_t sig_sem; 1860#define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1861#define SEM_WAIT(sem) semaphore_wait(sem); 1862#define SEM_POST(sem) semaphore_signal(sem); 1863#else 1864static sem_t sig_sem; 1865#define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1866#define SEM_WAIT(sem) sem_wait(&sem); 1867#define SEM_POST(sem) sem_post(&sem); 1868#endif 1869 1870void os::signal_init_pd() { 1871 // Initialize signal structures 1872 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1873 1874 // Initialize signal semaphore 1875 ::SEM_INIT(sig_sem, 0); 1876} 1877 1878void os::signal_notify(int sig) { 1879 Atomic::inc(&pending_signals[sig]); 1880 ::SEM_POST(sig_sem); 1881} 1882 1883static int check_pending_signals(bool wait) { 1884 Atomic::store(0, &sigint_count); 1885 for (;;) { 1886 for (int i = 0; i < NSIG + 1; i++) { 1887 jint n = pending_signals[i]; 1888 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1889 return i; 1890 } 1891 } 1892 if (!wait) { 1893 return -1; 1894 } 1895 JavaThread *thread = JavaThread::current(); 1896 ThreadBlockInVM tbivm(thread); 1897 1898 bool threadIsSuspended; 1899 do { 1900 thread->set_suspend_equivalent(); 1901 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1902 ::SEM_WAIT(sig_sem); 1903 1904 // were we externally suspended while we were waiting? 1905 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1906 if (threadIsSuspended) { 1907 // 1908 // The semaphore has been incremented, but while we were waiting 1909 // another thread suspended us. We don't want to continue running 1910 // while suspended because that would surprise the thread that 1911 // suspended us. 1912 // 1913 ::SEM_POST(sig_sem); 1914 1915 thread->java_suspend_self(); 1916 } 1917 } while (threadIsSuspended); 1918 } 1919} 1920 1921int os::signal_lookup() { 1922 return check_pending_signals(false); 1923} 1924 1925int os::signal_wait() { 1926 return check_pending_signals(true); 1927} 1928 1929//////////////////////////////////////////////////////////////////////////////// 1930// Virtual Memory 1931 1932int os::vm_page_size() { 1933 // Seems redundant as all get out 1934 assert(os::Bsd::page_size() != -1, "must call os::init"); 1935 return os::Bsd::page_size(); 1936} 1937 1938// Solaris allocates memory by pages. 1939int os::vm_allocation_granularity() { 1940 assert(os::Bsd::page_size() != -1, "must call os::init"); 1941 return os::Bsd::page_size(); 1942} 1943 1944// Rationale behind this function: 1945// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1946// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1947// samples for JITted code. Here we create private executable mapping over the code cache 1948// and then we can use standard (well, almost, as mapping can change) way to provide 1949// info for the reporting script by storing timestamp and location of symbol 1950void bsd_wrap_code(char* base, size_t size) { 1951 static volatile jint cnt = 0; 1952 1953 if (!UseOprofile) { 1954 return; 1955 } 1956 1957 char buf[PATH_MAX + 1]; 1958 int num = Atomic::add(1, &cnt); 1959 1960 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1961 os::get_temp_directory(), os::current_process_id(), num); 1962 unlink(buf); 1963 1964 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1965 1966 if (fd != -1) { 1967 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1968 if (rv != (off_t)-1) { 1969 if (::write(fd, "", 1) == 1) { 1970 mmap(base, size, 1971 PROT_READ|PROT_WRITE|PROT_EXEC, 1972 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1973 } 1974 } 1975 ::close(fd); 1976 unlink(buf); 1977 } 1978} 1979 1980// NOTE: Bsd kernel does not really reserve the pages for us. 1981// All it does is to check if there are enough free pages 1982// left at the time of mmap(). This could be a potential 1983// problem. 1984bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1985 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 1986#ifdef __OpenBSD__ 1987 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 1988 return ::mprotect(addr, size, prot) == 0; 1989#else 1990 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 1991 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 1992 return res != (uintptr_t) MAP_FAILED; 1993#endif 1994} 1995 1996 1997bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 1998 bool exec) { 1999 return commit_memory(addr, size, exec); 2000} 2001 2002void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2003} 2004 2005void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2006 ::madvise(addr, bytes, MADV_DONTNEED); 2007} 2008 2009void os::numa_make_global(char *addr, size_t bytes) { 2010} 2011 2012void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2013} 2014 2015bool os::numa_topology_changed() { return false; } 2016 2017size_t os::numa_get_groups_num() { 2018 return 1; 2019} 2020 2021int os::numa_get_group_id() { 2022 return 0; 2023} 2024 2025size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2026 if (size > 0) { 2027 ids[0] = 0; 2028 return 1; 2029 } 2030 return 0; 2031} 2032 2033bool os::get_page_info(char *start, page_info* info) { 2034 return false; 2035} 2036 2037char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2038 return end; 2039} 2040 2041 2042bool os::pd_uncommit_memory(char* addr, size_t size) { 2043#ifdef __OpenBSD__ 2044 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2045 return ::mprotect(addr, size, PROT_NONE) == 0; 2046#else 2047 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2048 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2049 return res != (uintptr_t) MAP_FAILED; 2050#endif 2051} 2052 2053bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2054 return os::commit_memory(addr, size); 2055} 2056 2057// If this is a growable mapping, remove the guard pages entirely by 2058// munmap()ping them. If not, just call uncommit_memory(). 2059bool os::remove_stack_guard_pages(char* addr, size_t size) { 2060 return os::uncommit_memory(addr, size); 2061} 2062 2063static address _highest_vm_reserved_address = NULL; 2064 2065// If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2066// at 'requested_addr'. If there are existing memory mappings at the same 2067// location, however, they will be overwritten. If 'fixed' is false, 2068// 'requested_addr' is only treated as a hint, the return value may or 2069// may not start from the requested address. Unlike Bsd mmap(), this 2070// function returns NULL to indicate failure. 2071static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2072 char * addr; 2073 int flags; 2074 2075 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2076 if (fixed) { 2077 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2078 flags |= MAP_FIXED; 2079 } 2080 2081 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 2082 // to PROT_EXEC if executable when we commit the page. 2083 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 2084 flags, -1, 0); 2085 2086 if (addr != MAP_FAILED) { 2087 // anon_mmap() should only get called during VM initialization, 2088 // don't need lock (actually we can skip locking even it can be called 2089 // from multiple threads, because _highest_vm_reserved_address is just a 2090 // hint about the upper limit of non-stack memory regions.) 2091 if ((address)addr + bytes > _highest_vm_reserved_address) { 2092 _highest_vm_reserved_address = (address)addr + bytes; 2093 } 2094 } 2095 2096 return addr == MAP_FAILED ? NULL : addr; 2097} 2098 2099// Don't update _highest_vm_reserved_address, because there might be memory 2100// regions above addr + size. If so, releasing a memory region only creates 2101// a hole in the address space, it doesn't help prevent heap-stack collision. 2102// 2103static int anon_munmap(char * addr, size_t size) { 2104 return ::munmap(addr, size) == 0; 2105} 2106 2107char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2108 size_t alignment_hint) { 2109 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2110} 2111 2112bool os::pd_release_memory(char* addr, size_t size) { 2113 return anon_munmap(addr, size); 2114} 2115 2116static address highest_vm_reserved_address() { 2117 return _highest_vm_reserved_address; 2118} 2119 2120static bool bsd_mprotect(char* addr, size_t size, int prot) { 2121 // Bsd wants the mprotect address argument to be page aligned. 2122 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2123 2124 // According to SUSv3, mprotect() should only be used with mappings 2125 // established by mmap(), and mmap() always maps whole pages. Unaligned 2126 // 'addr' likely indicates problem in the VM (e.g. trying to change 2127 // protection of malloc'ed or statically allocated memory). Check the 2128 // caller if you hit this assert. 2129 assert(addr == bottom, "sanity check"); 2130 2131 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2132 return ::mprotect(bottom, size, prot) == 0; 2133} 2134 2135// Set protections specified 2136bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2137 bool is_committed) { 2138 unsigned int p = 0; 2139 switch (prot) { 2140 case MEM_PROT_NONE: p = PROT_NONE; break; 2141 case MEM_PROT_READ: p = PROT_READ; break; 2142 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2143 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2144 default: 2145 ShouldNotReachHere(); 2146 } 2147 // is_committed is unused. 2148 return bsd_mprotect(addr, bytes, p); 2149} 2150 2151bool os::guard_memory(char* addr, size_t size) { 2152 return bsd_mprotect(addr, size, PROT_NONE); 2153} 2154 2155bool os::unguard_memory(char* addr, size_t size) { 2156 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2157} 2158 2159bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2160 return false; 2161} 2162 2163/* 2164* Set the coredump_filter bits to include largepages in core dump (bit 6) 2165* 2166* From the coredump_filter documentation: 2167* 2168* - (bit 0) anonymous private memory 2169* - (bit 1) anonymous shared memory 2170* - (bit 2) file-backed private memory 2171* - (bit 3) file-backed shared memory 2172* - (bit 4) ELF header pages in file-backed private memory areas (it is 2173* effective only if the bit 2 is cleared) 2174* - (bit 5) hugetlb private memory 2175* - (bit 6) hugetlb shared memory 2176*/ 2177static void set_coredump_filter(void) { 2178 FILE *f; 2179 long cdm; 2180 2181 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 2182 return; 2183 } 2184 2185 if (fscanf(f, "%lx", &cdm) != 1) { 2186 fclose(f); 2187 return; 2188 } 2189 2190 rewind(f); 2191 2192 if ((cdm & LARGEPAGES_BIT) == 0) { 2193 cdm |= LARGEPAGES_BIT; 2194 fprintf(f, "%#lx", cdm); 2195 } 2196 2197 fclose(f); 2198} 2199 2200// Large page support 2201 2202static size_t _large_page_size = 0; 2203 2204void os::large_page_init() { 2205} 2206 2207 2208char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 2209 // "exec" is passed in but not used. Creating the shared image for 2210 // the code cache doesn't have an SHM_X executable permission to check. 2211 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2212 2213 key_t key = IPC_PRIVATE; 2214 char *addr; 2215 2216 bool warn_on_failure = UseLargePages && 2217 (!FLAG_IS_DEFAULT(UseLargePages) || 2218 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2219 ); 2220 char msg[128]; 2221 2222 // Create a large shared memory region to attach to based on size. 2223 // Currently, size is the total size of the heap 2224 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2225 if (shmid == -1) { 2226 // Possible reasons for shmget failure: 2227 // 1. shmmax is too small for Java heap. 2228 // > check shmmax value: cat /proc/sys/kernel/shmmax 2229 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2230 // 2. not enough large page memory. 2231 // > check available large pages: cat /proc/meminfo 2232 // > increase amount of large pages: 2233 // echo new_value > /proc/sys/vm/nr_hugepages 2234 // Note 1: different Bsd may use different name for this property, 2235 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2236 // Note 2: it's possible there's enough physical memory available but 2237 // they are so fragmented after a long run that they can't 2238 // coalesce into large pages. Try to reserve large pages when 2239 // the system is still "fresh". 2240 if (warn_on_failure) { 2241 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2242 warning(msg); 2243 } 2244 return NULL; 2245 } 2246 2247 // attach to the region 2248 addr = (char*)shmat(shmid, req_addr, 0); 2249 int err = errno; 2250 2251 // Remove shmid. If shmat() is successful, the actual shared memory segment 2252 // will be deleted when it's detached by shmdt() or when the process 2253 // terminates. If shmat() is not successful this will remove the shared 2254 // segment immediately. 2255 shmctl(shmid, IPC_RMID, NULL); 2256 2257 if ((intptr_t)addr == -1) { 2258 if (warn_on_failure) { 2259 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2260 warning(msg); 2261 } 2262 return NULL; 2263 } 2264 2265 // The memory is committed 2266 address pc = CALLER_PC; 2267 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); 2268 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); 2269 2270 return addr; 2271} 2272 2273bool os::release_memory_special(char* base, size_t bytes) { 2274 // detaching the SHM segment will also delete it, see reserve_memory_special() 2275 int rslt = shmdt(base); 2276 if (rslt == 0) { 2277 MemTracker::record_virtual_memory_uncommit((address)base, bytes); 2278 MemTracker::record_virtual_memory_release((address)base, bytes); 2279 return true; 2280 } else { 2281 return false; 2282 } 2283 2284} 2285 2286size_t os::large_page_size() { 2287 return _large_page_size; 2288} 2289 2290// HugeTLBFS allows application to commit large page memory on demand; 2291// with SysV SHM the entire memory region must be allocated as shared 2292// memory. 2293bool os::can_commit_large_page_memory() { 2294 return UseHugeTLBFS; 2295} 2296 2297bool os::can_execute_large_page_memory() { 2298 return UseHugeTLBFS; 2299} 2300 2301// Reserve memory at an arbitrary address, only if that area is 2302// available (and not reserved for something else). 2303 2304char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2305 const int max_tries = 10; 2306 char* base[max_tries]; 2307 size_t size[max_tries]; 2308 const size_t gap = 0x000000; 2309 2310 // Assert only that the size is a multiple of the page size, since 2311 // that's all that mmap requires, and since that's all we really know 2312 // about at this low abstraction level. If we need higher alignment, 2313 // we can either pass an alignment to this method or verify alignment 2314 // in one of the methods further up the call chain. See bug 5044738. 2315 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2316 2317 // Repeatedly allocate blocks until the block is allocated at the 2318 // right spot. Give up after max_tries. Note that reserve_memory() will 2319 // automatically update _highest_vm_reserved_address if the call is 2320 // successful. The variable tracks the highest memory address every reserved 2321 // by JVM. It is used to detect heap-stack collision if running with 2322 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2323 // space than needed, it could confuse the collision detecting code. To 2324 // solve the problem, save current _highest_vm_reserved_address and 2325 // calculate the correct value before return. 2326 address old_highest = _highest_vm_reserved_address; 2327 2328 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2329 // if kernel honors the hint then we can return immediately. 2330 char * addr = anon_mmap(requested_addr, bytes, false); 2331 if (addr == requested_addr) { 2332 return requested_addr; 2333 } 2334 2335 if (addr != NULL) { 2336 // mmap() is successful but it fails to reserve at the requested address 2337 anon_munmap(addr, bytes); 2338 } 2339 2340 int i; 2341 for (i = 0; i < max_tries; ++i) { 2342 base[i] = reserve_memory(bytes); 2343 2344 if (base[i] != NULL) { 2345 // Is this the block we wanted? 2346 if (base[i] == requested_addr) { 2347 size[i] = bytes; 2348 break; 2349 } 2350 2351 // Does this overlap the block we wanted? Give back the overlapped 2352 // parts and try again. 2353 2354 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2355 if (top_overlap >= 0 && top_overlap < bytes) { 2356 unmap_memory(base[i], top_overlap); 2357 base[i] += top_overlap; 2358 size[i] = bytes - top_overlap; 2359 } else { 2360 size_t bottom_overlap = base[i] + bytes - requested_addr; 2361 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2362 unmap_memory(requested_addr, bottom_overlap); 2363 size[i] = bytes - bottom_overlap; 2364 } else { 2365 size[i] = bytes; 2366 } 2367 } 2368 } 2369 } 2370 2371 // Give back the unused reserved pieces. 2372 2373 for (int j = 0; j < i; ++j) { 2374 if (base[j] != NULL) { 2375 unmap_memory(base[j], size[j]); 2376 } 2377 } 2378 2379 if (i < max_tries) { 2380 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2381 return requested_addr; 2382 } else { 2383 _highest_vm_reserved_address = old_highest; 2384 return NULL; 2385 } 2386} 2387 2388size_t os::read(int fd, void *buf, unsigned int nBytes) { 2389 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2390} 2391 2392// TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2393// Solaris uses poll(), bsd uses park(). 2394// Poll() is likely a better choice, assuming that Thread.interrupt() 2395// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2396// SIGSEGV, see 4355769. 2397 2398int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2399 assert(thread == Thread::current(), "thread consistency check"); 2400 2401 ParkEvent * const slp = thread->_SleepEvent ; 2402 slp->reset() ; 2403 OrderAccess::fence() ; 2404 2405 if (interruptible) { 2406 jlong prevtime = javaTimeNanos(); 2407 2408 for (;;) { 2409 if (os::is_interrupted(thread, true)) { 2410 return OS_INTRPT; 2411 } 2412 2413 jlong newtime = javaTimeNanos(); 2414 2415 if (newtime - prevtime < 0) { 2416 // time moving backwards, should only happen if no monotonic clock 2417 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2418 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2419 } else { 2420 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2421 } 2422 2423 if(millis <= 0) { 2424 return OS_OK; 2425 } 2426 2427 prevtime = newtime; 2428 2429 { 2430 assert(thread->is_Java_thread(), "sanity check"); 2431 JavaThread *jt = (JavaThread *) thread; 2432 ThreadBlockInVM tbivm(jt); 2433 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2434 2435 jt->set_suspend_equivalent(); 2436 // cleared by handle_special_suspend_equivalent_condition() or 2437 // java_suspend_self() via check_and_wait_while_suspended() 2438 2439 slp->park(millis); 2440 2441 // were we externally suspended while we were waiting? 2442 jt->check_and_wait_while_suspended(); 2443 } 2444 } 2445 } else { 2446 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2447 jlong prevtime = javaTimeNanos(); 2448 2449 for (;;) { 2450 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2451 // the 1st iteration ... 2452 jlong newtime = javaTimeNanos(); 2453 2454 if (newtime - prevtime < 0) { 2455 // time moving backwards, should only happen if no monotonic clock 2456 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2457 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2458 } else { 2459 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2460 } 2461 2462 if(millis <= 0) break ; 2463 2464 prevtime = newtime; 2465 slp->park(millis); 2466 } 2467 return OS_OK ; 2468 } 2469} 2470 2471int os::naked_sleep() { 2472 // %% make the sleep time an integer flag. for now use 1 millisec. 2473 return os::sleep(Thread::current(), 1, false); 2474} 2475 2476// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2477void os::infinite_sleep() { 2478 while (true) { // sleep forever ... 2479 ::sleep(100); // ... 100 seconds at a time 2480 } 2481} 2482 2483// Used to convert frequent JVM_Yield() to nops 2484bool os::dont_yield() { 2485 return DontYieldALot; 2486} 2487 2488void os::yield() { 2489 sched_yield(); 2490} 2491 2492os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2493 2494void os::yield_all(int attempts) { 2495 // Yields to all threads, including threads with lower priorities 2496 // Threads on Bsd are all with same priority. The Solaris style 2497 // os::yield_all() with nanosleep(1ms) is not necessary. 2498 sched_yield(); 2499} 2500 2501// Called from the tight loops to possibly influence time-sharing heuristics 2502void os::loop_breaker(int attempts) { 2503 os::yield_all(attempts); 2504} 2505 2506//////////////////////////////////////////////////////////////////////////////// 2507// thread priority support 2508 2509// Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2510// only supports dynamic priority, static priority must be zero. For real-time 2511// applications, Bsd supports SCHED_RR which allows static priority (1-99). 2512// However, for large multi-threaded applications, SCHED_RR is not only slower 2513// than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2514// of 5 runs - Sep 2005). 2515// 2516// The following code actually changes the niceness of kernel-thread/LWP. It 2517// has an assumption that setpriority() only modifies one kernel-thread/LWP, 2518// not the entire user process, and user level threads are 1:1 mapped to kernel 2519// threads. It has always been the case, but could change in the future. For 2520// this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2521// It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2522 2523#if !defined(__APPLE__) 2524int os::java_to_os_priority[CriticalPriority + 1] = { 2525 19, // 0 Entry should never be used 2526 2527 0, // 1 MinPriority 2528 3, // 2 2529 6, // 3 2530 2531 10, // 4 2532 15, // 5 NormPriority 2533 18, // 6 2534 2535 21, // 7 2536 25, // 8 2537 28, // 9 NearMaxPriority 2538 2539 31, // 10 MaxPriority 2540 2541 31 // 11 CriticalPriority 2542}; 2543#else 2544/* Using Mach high-level priority assignments */ 2545int os::java_to_os_priority[CriticalPriority + 1] = { 2546 0, // 0 Entry should never be used (MINPRI_USER) 2547 2548 27, // 1 MinPriority 2549 28, // 2 2550 29, // 3 2551 2552 30, // 4 2553 31, // 5 NormPriority (BASEPRI_DEFAULT) 2554 32, // 6 2555 2556 33, // 7 2557 34, // 8 2558 35, // 9 NearMaxPriority 2559 2560 36, // 10 MaxPriority 2561 2562 36 // 11 CriticalPriority 2563}; 2564#endif 2565 2566static int prio_init() { 2567 if (ThreadPriorityPolicy == 1) { 2568 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2569 // if effective uid is not root. Perhaps, a more elegant way of doing 2570 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2571 if (geteuid() != 0) { 2572 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2573 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2574 } 2575 ThreadPriorityPolicy = 0; 2576 } 2577 } 2578 if (UseCriticalJavaThreadPriority) { 2579 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2580 } 2581 return 0; 2582} 2583 2584OSReturn os::set_native_priority(Thread* thread, int newpri) { 2585 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2586 2587#ifdef __OpenBSD__ 2588 // OpenBSD pthread_setprio starves low priority threads 2589 return OS_OK; 2590#elif defined(__FreeBSD__) 2591 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2592#elif defined(__APPLE__) || defined(__NetBSD__) 2593 struct sched_param sp; 2594 int policy; 2595 pthread_t self = pthread_self(); 2596 2597 if (pthread_getschedparam(self, &policy, &sp) != 0) 2598 return OS_ERR; 2599 2600 sp.sched_priority = newpri; 2601 if (pthread_setschedparam(self, policy, &sp) != 0) 2602 return OS_ERR; 2603 2604 return OS_OK; 2605#else 2606 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2607 return (ret == 0) ? OS_OK : OS_ERR; 2608#endif 2609} 2610 2611OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2612 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2613 *priority_ptr = java_to_os_priority[NormPriority]; 2614 return OS_OK; 2615 } 2616 2617 errno = 0; 2618#if defined(__OpenBSD__) || defined(__FreeBSD__) 2619 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2620#elif defined(__APPLE__) || defined(__NetBSD__) 2621 int policy; 2622 struct sched_param sp; 2623 2624 pthread_getschedparam(pthread_self(), &policy, &sp); 2625 *priority_ptr = sp.sched_priority; 2626#else 2627 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2628#endif 2629 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2630} 2631 2632// Hint to the underlying OS that a task switch would not be good. 2633// Void return because it's a hint and can fail. 2634void os::hint_no_preempt() {} 2635 2636//////////////////////////////////////////////////////////////////////////////// 2637// suspend/resume support 2638 2639// the low-level signal-based suspend/resume support is a remnant from the 2640// old VM-suspension that used to be for java-suspension, safepoints etc, 2641// within hotspot. Now there is a single use-case for this: 2642// - calling get_thread_pc() on the VMThread by the flat-profiler task 2643// that runs in the watcher thread. 2644// The remaining code is greatly simplified from the more general suspension 2645// code that used to be used. 2646// 2647// The protocol is quite simple: 2648// - suspend: 2649// - sends a signal to the target thread 2650// - polls the suspend state of the osthread using a yield loop 2651// - target thread signal handler (SR_handler) sets suspend state 2652// and blocks in sigsuspend until continued 2653// - resume: 2654// - sets target osthread state to continue 2655// - sends signal to end the sigsuspend loop in the SR_handler 2656// 2657// Note that the SR_lock plays no role in this suspend/resume protocol. 2658// 2659 2660static void resume_clear_context(OSThread *osthread) { 2661 osthread->set_ucontext(NULL); 2662 osthread->set_siginfo(NULL); 2663 2664 // notify the suspend action is completed, we have now resumed 2665 osthread->sr.clear_suspended(); 2666} 2667 2668static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2669 osthread->set_ucontext(context); 2670 osthread->set_siginfo(siginfo); 2671} 2672 2673// 2674// Handler function invoked when a thread's execution is suspended or 2675// resumed. We have to be careful that only async-safe functions are 2676// called here (Note: most pthread functions are not async safe and 2677// should be avoided.) 2678// 2679// Note: sigwait() is a more natural fit than sigsuspend() from an 2680// interface point of view, but sigwait() prevents the signal hander 2681// from being run. libpthread would get very confused by not having 2682// its signal handlers run and prevents sigwait()'s use with the 2683// mutex granting granting signal. 2684// 2685// Currently only ever called on the VMThread 2686// 2687static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2688 // Save and restore errno to avoid confusing native code with EINTR 2689 // after sigsuspend. 2690 int old_errno = errno; 2691 2692 Thread* thread = Thread::current(); 2693 OSThread* osthread = thread->osthread(); 2694 assert(thread->is_VM_thread(), "Must be VMThread"); 2695 // read current suspend action 2696 int action = osthread->sr.suspend_action(); 2697 if (action == os::Bsd::SuspendResume::SR_SUSPEND) { 2698 suspend_save_context(osthread, siginfo, context); 2699 2700 // Notify the suspend action is about to be completed. do_suspend() 2701 // waits until SR_SUSPENDED is set and then returns. We will wait 2702 // here for a resume signal and that completes the suspend-other 2703 // action. do_suspend/do_resume is always called as a pair from 2704 // the same thread - so there are no races 2705 2706 // notify the caller 2707 osthread->sr.set_suspended(); 2708 2709 sigset_t suspend_set; // signals for sigsuspend() 2710 2711 // get current set of blocked signals and unblock resume signal 2712 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2713 sigdelset(&suspend_set, SR_signum); 2714 2715 // wait here until we are resumed 2716 do { 2717 sigsuspend(&suspend_set); 2718 // ignore all returns until we get a resume signal 2719 } while (osthread->sr.suspend_action() != os::Bsd::SuspendResume::SR_CONTINUE); 2720 2721 resume_clear_context(osthread); 2722 2723 } else { 2724 assert(action == os::Bsd::SuspendResume::SR_CONTINUE, "unexpected sr action"); 2725 // nothing special to do - just leave the handler 2726 } 2727 2728 errno = old_errno; 2729} 2730 2731 2732static int SR_initialize() { 2733 struct sigaction act; 2734 char *s; 2735 /* Get signal number to use for suspend/resume */ 2736 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2737 int sig = ::strtol(s, 0, 10); 2738 if (sig > 0 || sig < NSIG) { 2739 SR_signum = sig; 2740 } 2741 } 2742 2743 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2744 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2745 2746 sigemptyset(&SR_sigset); 2747 sigaddset(&SR_sigset, SR_signum); 2748 2749 /* Set up signal handler for suspend/resume */ 2750 act.sa_flags = SA_RESTART|SA_SIGINFO; 2751 act.sa_handler = (void (*)(int)) SR_handler; 2752 2753 // SR_signum is blocked by default. 2754 // 4528190 - We also need to block pthread restart signal (32 on all 2755 // supported Bsd platforms). Note that BsdThreads need to block 2756 // this signal for all threads to work properly. So we don't have 2757 // to use hard-coded signal number when setting up the mask. 2758 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2759 2760 if (sigaction(SR_signum, &act, 0) == -1) { 2761 return -1; 2762 } 2763 2764 // Save signal flag 2765 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2766 return 0; 2767} 2768 2769static int SR_finalize() { 2770 return 0; 2771} 2772 2773 2774// returns true on success and false on error - really an error is fatal 2775// but this seems the normal response to library errors 2776static bool do_suspend(OSThread* osthread) { 2777 // mark as suspended and send signal 2778 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_SUSPEND); 2779 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2780 assert_status(status == 0, status, "pthread_kill"); 2781 2782 // check status and wait until notified of suspension 2783 if (status == 0) { 2784 for (int i = 0; !osthread->sr.is_suspended(); i++) { 2785 os::yield_all(i); 2786 } 2787 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); 2788 return true; 2789 } 2790 else { 2791 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); 2792 return false; 2793 } 2794} 2795 2796static void do_resume(OSThread* osthread) { 2797 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2798 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_CONTINUE); 2799 2800 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2801 assert_status(status == 0, status, "pthread_kill"); 2802 // check status and wait unit notified of resumption 2803 if (status == 0) { 2804 for (int i = 0; osthread->sr.is_suspended(); i++) { 2805 os::yield_all(i); 2806 } 2807 } 2808 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); 2809} 2810 2811//////////////////////////////////////////////////////////////////////////////// 2812// interrupt support 2813 2814void os::interrupt(Thread* thread) { 2815 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2816 "possibility of dangling Thread pointer"); 2817 2818 OSThread* osthread = thread->osthread(); 2819 2820 if (!osthread->interrupted()) { 2821 osthread->set_interrupted(true); 2822 // More than one thread can get here with the same value of osthread, 2823 // resulting in multiple notifications. We do, however, want the store 2824 // to interrupted() to be visible to other threads before we execute unpark(). 2825 OrderAccess::fence(); 2826 ParkEvent * const slp = thread->_SleepEvent ; 2827 if (slp != NULL) slp->unpark() ; 2828 } 2829 2830 // For JSR166. Unpark even if interrupt status already was set 2831 if (thread->is_Java_thread()) 2832 ((JavaThread*)thread)->parker()->unpark(); 2833 2834 ParkEvent * ev = thread->_ParkEvent ; 2835 if (ev != NULL) ev->unpark() ; 2836 2837} 2838 2839bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2840 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2841 "possibility of dangling Thread pointer"); 2842 2843 OSThread* osthread = thread->osthread(); 2844 2845 bool interrupted = osthread->interrupted(); 2846 2847 if (interrupted && clear_interrupted) { 2848 osthread->set_interrupted(false); 2849 // consider thread->_SleepEvent->reset() ... optional optimization 2850 } 2851 2852 return interrupted; 2853} 2854 2855/////////////////////////////////////////////////////////////////////////////////// 2856// signal handling (except suspend/resume) 2857 2858// This routine may be used by user applications as a "hook" to catch signals. 2859// The user-defined signal handler must pass unrecognized signals to this 2860// routine, and if it returns true (non-zero), then the signal handler must 2861// return immediately. If the flag "abort_if_unrecognized" is true, then this 2862// routine will never retun false (zero), but instead will execute a VM panic 2863// routine kill the process. 2864// 2865// If this routine returns false, it is OK to call it again. This allows 2866// the user-defined signal handler to perform checks either before or after 2867// the VM performs its own checks. Naturally, the user code would be making 2868// a serious error if it tried to handle an exception (such as a null check 2869// or breakpoint) that the VM was generating for its own correct operation. 2870// 2871// This routine may recognize any of the following kinds of signals: 2872// SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2873// It should be consulted by handlers for any of those signals. 2874// 2875// The caller of this routine must pass in the three arguments supplied 2876// to the function referred to in the "sa_sigaction" (not the "sa_handler") 2877// field of the structure passed to sigaction(). This routine assumes that 2878// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2879// 2880// Note that the VM will print warnings if it detects conflicting signal 2881// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2882// 2883extern "C" JNIEXPORT int 2884JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2885 void* ucontext, int abort_if_unrecognized); 2886 2887void signalHandler(int sig, siginfo_t* info, void* uc) { 2888 assert(info != NULL && uc != NULL, "it must be old kernel"); 2889 int orig_errno = errno; // Preserve errno value over signal handler. 2890 JVM_handle_bsd_signal(sig, info, uc, true); 2891 errno = orig_errno; 2892} 2893 2894 2895// This boolean allows users to forward their own non-matching signals 2896// to JVM_handle_bsd_signal, harmlessly. 2897bool os::Bsd::signal_handlers_are_installed = false; 2898 2899// For signal-chaining 2900struct sigaction os::Bsd::sigact[MAXSIGNUM]; 2901unsigned int os::Bsd::sigs = 0; 2902bool os::Bsd::libjsig_is_loaded = false; 2903typedef struct sigaction *(*get_signal_t)(int); 2904get_signal_t os::Bsd::get_signal_action = NULL; 2905 2906struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2907 struct sigaction *actp = NULL; 2908 2909 if (libjsig_is_loaded) { 2910 // Retrieve the old signal handler from libjsig 2911 actp = (*get_signal_action)(sig); 2912 } 2913 if (actp == NULL) { 2914 // Retrieve the preinstalled signal handler from jvm 2915 actp = get_preinstalled_handler(sig); 2916 } 2917 2918 return actp; 2919} 2920 2921static bool call_chained_handler(struct sigaction *actp, int sig, 2922 siginfo_t *siginfo, void *context) { 2923 // Call the old signal handler 2924 if (actp->sa_handler == SIG_DFL) { 2925 // It's more reasonable to let jvm treat it as an unexpected exception 2926 // instead of taking the default action. 2927 return false; 2928 } else if (actp->sa_handler != SIG_IGN) { 2929 if ((actp->sa_flags & SA_NODEFER) == 0) { 2930 // automaticlly block the signal 2931 sigaddset(&(actp->sa_mask), sig); 2932 } 2933 2934 sa_handler_t hand; 2935 sa_sigaction_t sa; 2936 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2937 // retrieve the chained handler 2938 if (siginfo_flag_set) { 2939 sa = actp->sa_sigaction; 2940 } else { 2941 hand = actp->sa_handler; 2942 } 2943 2944 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2945 actp->sa_handler = SIG_DFL; 2946 } 2947 2948 // try to honor the signal mask 2949 sigset_t oset; 2950 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2951 2952 // call into the chained handler 2953 if (siginfo_flag_set) { 2954 (*sa)(sig, siginfo, context); 2955 } else { 2956 (*hand)(sig); 2957 } 2958 2959 // restore the signal mask 2960 pthread_sigmask(SIG_SETMASK, &oset, 0); 2961 } 2962 // Tell jvm's signal handler the signal is taken care of. 2963 return true; 2964} 2965 2966bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2967 bool chained = false; 2968 // signal-chaining 2969 if (UseSignalChaining) { 2970 struct sigaction *actp = get_chained_signal_action(sig); 2971 if (actp != NULL) { 2972 chained = call_chained_handler(actp, sig, siginfo, context); 2973 } 2974 } 2975 return chained; 2976} 2977 2978struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2979 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 2980 return &sigact[sig]; 2981 } 2982 return NULL; 2983} 2984 2985void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2986 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2987 sigact[sig] = oldAct; 2988 sigs |= (unsigned int)1 << sig; 2989} 2990 2991// for diagnostic 2992int os::Bsd::sigflags[MAXSIGNUM]; 2993 2994int os::Bsd::get_our_sigflags(int sig) { 2995 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2996 return sigflags[sig]; 2997} 2998 2999void os::Bsd::set_our_sigflags(int sig, int flags) { 3000 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3001 sigflags[sig] = flags; 3002} 3003 3004void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3005 // Check for overwrite. 3006 struct sigaction oldAct; 3007 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3008 3009 void* oldhand = oldAct.sa_sigaction 3010 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3011 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3012 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3013 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3014 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3015 if (AllowUserSignalHandlers || !set_installed) { 3016 // Do not overwrite; user takes responsibility to forward to us. 3017 return; 3018 } else if (UseSignalChaining) { 3019 // save the old handler in jvm 3020 save_preinstalled_handler(sig, oldAct); 3021 // libjsig also interposes the sigaction() call below and saves the 3022 // old sigaction on it own. 3023 } else { 3024 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3025 "%#lx for signal %d.", (long)oldhand, sig)); 3026 } 3027 } 3028 3029 struct sigaction sigAct; 3030 sigfillset(&(sigAct.sa_mask)); 3031 sigAct.sa_handler = SIG_DFL; 3032 if (!set_installed) { 3033 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3034 } else { 3035 sigAct.sa_sigaction = signalHandler; 3036 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3037 } 3038 // Save flags, which are set by ours 3039 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3040 sigflags[sig] = sigAct.sa_flags; 3041 3042 int ret = sigaction(sig, &sigAct, &oldAct); 3043 assert(ret == 0, "check"); 3044 3045 void* oldhand2 = oldAct.sa_sigaction 3046 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3047 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3048 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3049} 3050 3051// install signal handlers for signals that HotSpot needs to 3052// handle in order to support Java-level exception handling. 3053 3054void os::Bsd::install_signal_handlers() { 3055 if (!signal_handlers_are_installed) { 3056 signal_handlers_are_installed = true; 3057 3058 // signal-chaining 3059 typedef void (*signal_setting_t)(); 3060 signal_setting_t begin_signal_setting = NULL; 3061 signal_setting_t end_signal_setting = NULL; 3062 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3063 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3064 if (begin_signal_setting != NULL) { 3065 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3066 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3067 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3068 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3069 libjsig_is_loaded = true; 3070 assert(UseSignalChaining, "should enable signal-chaining"); 3071 } 3072 if (libjsig_is_loaded) { 3073 // Tell libjsig jvm is setting signal handlers 3074 (*begin_signal_setting)(); 3075 } 3076 3077 set_signal_handler(SIGSEGV, true); 3078 set_signal_handler(SIGPIPE, true); 3079 set_signal_handler(SIGBUS, true); 3080 set_signal_handler(SIGILL, true); 3081 set_signal_handler(SIGFPE, true); 3082 set_signal_handler(SIGXFSZ, true); 3083 3084#if defined(__APPLE__) 3085 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3086 // signals caught and handled by the JVM. To work around this, we reset the mach task 3087 // signal handler that's placed on our process by CrashReporter. This disables 3088 // CrashReporter-based reporting. 3089 // 3090 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3091 // on caught fatal signals. 3092 // 3093 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3094 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3095 // exception handling, while leaving the standard BSD signal handlers functional. 3096 kern_return_t kr; 3097 kr = task_set_exception_ports(mach_task_self(), 3098 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3099 MACH_PORT_NULL, 3100 EXCEPTION_STATE_IDENTITY, 3101 MACHINE_THREAD_STATE); 3102 3103 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3104#endif 3105 3106 if (libjsig_is_loaded) { 3107 // Tell libjsig jvm finishes setting signal handlers 3108 (*end_signal_setting)(); 3109 } 3110 3111 // We don't activate signal checker if libjsig is in place, we trust ourselves 3112 // and if UserSignalHandler is installed all bets are off 3113 if (CheckJNICalls) { 3114 if (libjsig_is_loaded) { 3115 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3116 check_signals = false; 3117 } 3118 if (AllowUserSignalHandlers) { 3119 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3120 check_signals = false; 3121 } 3122 } 3123 } 3124} 3125 3126 3127///// 3128// glibc on Bsd platform uses non-documented flag 3129// to indicate, that some special sort of signal 3130// trampoline is used. 3131// We will never set this flag, and we should 3132// ignore this flag in our diagnostic 3133#ifdef SIGNIFICANT_SIGNAL_MASK 3134#undef SIGNIFICANT_SIGNAL_MASK 3135#endif 3136#define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3137 3138static const char* get_signal_handler_name(address handler, 3139 char* buf, int buflen) { 3140 int offset; 3141 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3142 if (found) { 3143 // skip directory names 3144 const char *p1, *p2; 3145 p1 = buf; 3146 size_t len = strlen(os::file_separator()); 3147 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3148 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3149 } else { 3150 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3151 } 3152 return buf; 3153} 3154 3155static void print_signal_handler(outputStream* st, int sig, 3156 char* buf, size_t buflen) { 3157 struct sigaction sa; 3158 3159 sigaction(sig, NULL, &sa); 3160 3161 // See comment for SIGNIFICANT_SIGNAL_MASK define 3162 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3163 3164 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3165 3166 address handler = (sa.sa_flags & SA_SIGINFO) 3167 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3168 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3169 3170 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3171 st->print("SIG_DFL"); 3172 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3173 st->print("SIG_IGN"); 3174 } else { 3175 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3176 } 3177 3178 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3179 3180 address rh = VMError::get_resetted_sighandler(sig); 3181 // May be, handler was resetted by VMError? 3182 if(rh != NULL) { 3183 handler = rh; 3184 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3185 } 3186 3187 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3188 3189 // Check: is it our handler? 3190 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3191 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3192 // It is our signal handler 3193 // check for flags, reset system-used one! 3194 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3195 st->print( 3196 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3197 os::Bsd::get_our_sigflags(sig)); 3198 } 3199 } 3200 st->cr(); 3201} 3202 3203 3204#define DO_SIGNAL_CHECK(sig) \ 3205 if (!sigismember(&check_signal_done, sig)) \ 3206 os::Bsd::check_signal_handler(sig) 3207 3208// This method is a periodic task to check for misbehaving JNI applications 3209// under CheckJNI, we can add any periodic checks here 3210 3211void os::run_periodic_checks() { 3212 3213 if (check_signals == false) return; 3214 3215 // SEGV and BUS if overridden could potentially prevent 3216 // generation of hs*.log in the event of a crash, debugging 3217 // such a case can be very challenging, so we absolutely 3218 // check the following for a good measure: 3219 DO_SIGNAL_CHECK(SIGSEGV); 3220 DO_SIGNAL_CHECK(SIGILL); 3221 DO_SIGNAL_CHECK(SIGFPE); 3222 DO_SIGNAL_CHECK(SIGBUS); 3223 DO_SIGNAL_CHECK(SIGPIPE); 3224 DO_SIGNAL_CHECK(SIGXFSZ); 3225 3226 3227 // ReduceSignalUsage allows the user to override these handlers 3228 // see comments at the very top and jvm_solaris.h 3229 if (!ReduceSignalUsage) { 3230 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3231 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3232 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3233 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3234 } 3235 3236 DO_SIGNAL_CHECK(SR_signum); 3237 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3238} 3239 3240typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3241 3242static os_sigaction_t os_sigaction = NULL; 3243 3244void os::Bsd::check_signal_handler(int sig) { 3245 char buf[O_BUFLEN]; 3246 address jvmHandler = NULL; 3247 3248 3249 struct sigaction act; 3250 if (os_sigaction == NULL) { 3251 // only trust the default sigaction, in case it has been interposed 3252 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3253 if (os_sigaction == NULL) return; 3254 } 3255 3256 os_sigaction(sig, (struct sigaction*)NULL, &act); 3257 3258 3259 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3260 3261 address thisHandler = (act.sa_flags & SA_SIGINFO) 3262 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3263 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3264 3265 3266 switch(sig) { 3267 case SIGSEGV: 3268 case SIGBUS: 3269 case SIGFPE: 3270 case SIGPIPE: 3271 case SIGILL: 3272 case SIGXFSZ: 3273 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3274 break; 3275 3276 case SHUTDOWN1_SIGNAL: 3277 case SHUTDOWN2_SIGNAL: 3278 case SHUTDOWN3_SIGNAL: 3279 case BREAK_SIGNAL: 3280 jvmHandler = (address)user_handler(); 3281 break; 3282 3283 case INTERRUPT_SIGNAL: 3284 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3285 break; 3286 3287 default: 3288 if (sig == SR_signum) { 3289 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3290 } else { 3291 return; 3292 } 3293 break; 3294 } 3295 3296 if (thisHandler != jvmHandler) { 3297 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3298 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3299 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3300 // No need to check this sig any longer 3301 sigaddset(&check_signal_done, sig); 3302 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3303 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3304 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3305 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3306 // No need to check this sig any longer 3307 sigaddset(&check_signal_done, sig); 3308 } 3309 3310 // Dump all the signal 3311 if (sigismember(&check_signal_done, sig)) { 3312 print_signal_handlers(tty, buf, O_BUFLEN); 3313 } 3314} 3315 3316extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3317 3318extern bool signal_name(int signo, char* buf, size_t len); 3319 3320const char* os::exception_name(int exception_code, char* buf, size_t size) { 3321 if (0 < exception_code && exception_code <= SIGRTMAX) { 3322 // signal 3323 if (!signal_name(exception_code, buf, size)) { 3324 jio_snprintf(buf, size, "SIG%d", exception_code); 3325 } 3326 return buf; 3327 } else { 3328 return NULL; 3329 } 3330} 3331 3332// this is called _before_ the most of global arguments have been parsed 3333void os::init(void) { 3334 char dummy; /* used to get a guess on initial stack address */ 3335// first_hrtime = gethrtime(); 3336 3337 // With BsdThreads the JavaMain thread pid (primordial thread) 3338 // is different than the pid of the java launcher thread. 3339 // So, on Bsd, the launcher thread pid is passed to the VM 3340 // via the sun.java.launcher.pid property. 3341 // Use this property instead of getpid() if it was correctly passed. 3342 // See bug 6351349. 3343 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3344 3345 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3346 3347 clock_tics_per_sec = CLK_TCK; 3348 3349 init_random(1234567); 3350 3351 ThreadCritical::initialize(); 3352 3353 Bsd::set_page_size(getpagesize()); 3354 if (Bsd::page_size() == -1) { 3355 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3356 strerror(errno))); 3357 } 3358 init_page_sizes((size_t) Bsd::page_size()); 3359 3360 Bsd::initialize_system_info(); 3361 3362 // main_thread points to the aboriginal thread 3363 Bsd::_main_thread = pthread_self(); 3364 3365 Bsd::clock_init(); 3366 initial_time_count = os::elapsed_counter(); 3367 3368#ifdef __APPLE__ 3369 // XXXDARWIN 3370 // Work around the unaligned VM callbacks in hotspot's 3371 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3372 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3373 // alignment when doing symbol lookup. To work around this, we force early 3374 // binding of all symbols now, thus binding when alignment is known-good. 3375 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3376#endif 3377} 3378 3379// To install functions for atexit system call 3380extern "C" { 3381 static void perfMemory_exit_helper() { 3382 perfMemory_exit(); 3383 } 3384} 3385 3386// this is called _after_ the global arguments have been parsed 3387jint os::init_2(void) 3388{ 3389 // Allocate a single page and mark it as readable for safepoint polling 3390 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3391 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3392 3393 os::set_polling_page( polling_page ); 3394 3395#ifndef PRODUCT 3396 if(Verbose && PrintMiscellaneous) 3397 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3398#endif 3399 3400 if (!UseMembar) { 3401 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3402 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 3403 os::set_memory_serialize_page( mem_serialize_page ); 3404 3405#ifndef PRODUCT 3406 if(Verbose && PrintMiscellaneous) 3407 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3408#endif 3409 } 3410 3411 os::large_page_init(); 3412 3413 // initialize suspend/resume support - must do this before signal_sets_init() 3414 if (SR_initialize() != 0) { 3415 perror("SR_initialize failed"); 3416 return JNI_ERR; 3417 } 3418 3419 Bsd::signal_sets_init(); 3420 Bsd::install_signal_handlers(); 3421 3422 // Check minimum allowable stack size for thread creation and to initialize 3423 // the java system classes, including StackOverflowError - depends on page 3424 // size. Add a page for compiler2 recursion in main thread. 3425 // Add in 2*BytesPerWord times page size to account for VM stack during 3426 // class initialization depending on 32 or 64 bit VM. 3427 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3428 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3429 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3430 3431 size_t threadStackSizeInBytes = ThreadStackSize * K; 3432 if (threadStackSizeInBytes != 0 && 3433 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3434 tty->print_cr("\nThe stack size specified is too small, " 3435 "Specify at least %dk", 3436 os::Bsd::min_stack_allowed/ K); 3437 return JNI_ERR; 3438 } 3439 3440 // Make the stack size a multiple of the page size so that 3441 // the yellow/red zones can be guarded. 3442 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3443 vm_page_size())); 3444 3445 if (MaxFDLimit) { 3446 // set the number of file descriptors to max. print out error 3447 // if getrlimit/setrlimit fails but continue regardless. 3448 struct rlimit nbr_files; 3449 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3450 if (status != 0) { 3451 if (PrintMiscellaneous && (Verbose || WizardMode)) 3452 perror("os::init_2 getrlimit failed"); 3453 } else { 3454 nbr_files.rlim_cur = nbr_files.rlim_max; 3455 3456#ifdef __APPLE__ 3457 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3458 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3459 // be used instead 3460 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3461#endif 3462 3463 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3464 if (status != 0) { 3465 if (PrintMiscellaneous && (Verbose || WizardMode)) 3466 perror("os::init_2 setrlimit failed"); 3467 } 3468 } 3469 } 3470 3471 // at-exit methods are called in the reverse order of their registration. 3472 // atexit functions are called on return from main or as a result of a 3473 // call to exit(3C). There can be only 32 of these functions registered 3474 // and atexit() does not set errno. 3475 3476 if (PerfAllowAtExitRegistration) { 3477 // only register atexit functions if PerfAllowAtExitRegistration is set. 3478 // atexit functions can be delayed until process exit time, which 3479 // can be problematic for embedded VM situations. Embedded VMs should 3480 // call DestroyJavaVM() to assure that VM resources are released. 3481 3482 // note: perfMemory_exit_helper atexit function may be removed in 3483 // the future if the appropriate cleanup code can be added to the 3484 // VM_Exit VMOperation's doit method. 3485 if (atexit(perfMemory_exit_helper) != 0) { 3486 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3487 } 3488 } 3489 3490 // initialize thread priority policy 3491 prio_init(); 3492 3493#ifdef __APPLE__ 3494 // dynamically link to objective c gc registration 3495 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3496 if (handleLibObjc != NULL) { 3497 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3498 } 3499#endif 3500 3501 return JNI_OK; 3502} 3503 3504// this is called at the end of vm_initialization 3505void os::init_3(void) { } 3506 3507// Mark the polling page as unreadable 3508void os::make_polling_page_unreadable(void) { 3509 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3510 fatal("Could not disable polling page"); 3511}; 3512 3513// Mark the polling page as readable 3514void os::make_polling_page_readable(void) { 3515 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3516 fatal("Could not enable polling page"); 3517 } 3518}; 3519 3520int os::active_processor_count() { 3521 return _processor_count; 3522} 3523 3524void os::set_native_thread_name(const char *name) { 3525#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3526 // This is only supported in Snow Leopard and beyond 3527 if (name != NULL) { 3528 // Add a "Java: " prefix to the name 3529 char buf[MAXTHREADNAMESIZE]; 3530 snprintf(buf, sizeof(buf), "Java: %s", name); 3531 pthread_setname_np(buf); 3532 } 3533#endif 3534} 3535 3536bool os::distribute_processes(uint length, uint* distribution) { 3537 // Not yet implemented. 3538 return false; 3539} 3540 3541bool os::bind_to_processor(uint processor_id) { 3542 // Not yet implemented. 3543 return false; 3544} 3545 3546/// 3547 3548// Suspends the target using the signal mechanism and then grabs the PC before 3549// resuming the target. Used by the flat-profiler only 3550ExtendedPC os::get_thread_pc(Thread* thread) { 3551 // Make sure that it is called by the watcher for the VMThread 3552 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3553 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3554 3555 ExtendedPC epc; 3556 3557 OSThread* osthread = thread->osthread(); 3558 if (do_suspend(osthread)) { 3559 if (osthread->ucontext() != NULL) { 3560 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 3561 } else { 3562 // NULL context is unexpected, double-check this is the VMThread 3563 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3564 } 3565 do_resume(osthread); 3566 } 3567 // failure means pthread_kill failed for some reason - arguably this is 3568 // a fatal problem, but such problems are ignored elsewhere 3569 3570 return epc; 3571} 3572 3573int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3574{ 3575 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3576} 3577 3578//////////////////////////////////////////////////////////////////////////////// 3579// debug support 3580 3581static address same_page(address x, address y) { 3582 int page_bits = -os::vm_page_size(); 3583 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 3584 return x; 3585 else if (x > y) 3586 return (address)(intptr_t(y) | ~page_bits) + 1; 3587 else 3588 return (address)(intptr_t(y) & page_bits); 3589} 3590 3591bool os::find(address addr, outputStream* st) { 3592 Dl_info dlinfo; 3593 memset(&dlinfo, 0, sizeof(dlinfo)); 3594 if (dladdr(addr, &dlinfo)) { 3595 st->print(PTR_FORMAT ": ", addr); 3596 if (dlinfo.dli_sname != NULL) { 3597 st->print("%s+%#x", dlinfo.dli_sname, 3598 addr - (intptr_t)dlinfo.dli_saddr); 3599 } else if (dlinfo.dli_fname) { 3600 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3601 } else { 3602 st->print("<absolute address>"); 3603 } 3604 if (dlinfo.dli_fname) { 3605 st->print(" in %s", dlinfo.dli_fname); 3606 } 3607 if (dlinfo.dli_fbase) { 3608 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3609 } 3610 st->cr(); 3611 3612 if (Verbose) { 3613 // decode some bytes around the PC 3614 address begin = same_page(addr-40, addr); 3615 address end = same_page(addr+40, addr); 3616 address lowest = (address) dlinfo.dli_sname; 3617 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3618 if (begin < lowest) begin = lowest; 3619 Dl_info dlinfo2; 3620 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 3621 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3622 end = (address) dlinfo2.dli_saddr; 3623 Disassembler::decode(begin, end, st); 3624 } 3625 return true; 3626 } 3627 return false; 3628} 3629 3630//////////////////////////////////////////////////////////////////////////////// 3631// misc 3632 3633// This does not do anything on Bsd. This is basically a hook for being 3634// able to use structured exception handling (thread-local exception filters) 3635// on, e.g., Win32. 3636void 3637os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3638 JavaCallArguments* args, Thread* thread) { 3639 f(value, method, args, thread); 3640} 3641 3642void os::print_statistics() { 3643} 3644 3645int os::message_box(const char* title, const char* message) { 3646 int i; 3647 fdStream err(defaultStream::error_fd()); 3648 for (i = 0; i < 78; i++) err.print_raw("="); 3649 err.cr(); 3650 err.print_raw_cr(title); 3651 for (i = 0; i < 78; i++) err.print_raw("-"); 3652 err.cr(); 3653 err.print_raw_cr(message); 3654 for (i = 0; i < 78; i++) err.print_raw("="); 3655 err.cr(); 3656 3657 char buf[16]; 3658 // Prevent process from exiting upon "read error" without consuming all CPU 3659 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3660 3661 return buf[0] == 'y' || buf[0] == 'Y'; 3662} 3663 3664int os::stat(const char *path, struct stat *sbuf) { 3665 char pathbuf[MAX_PATH]; 3666 if (strlen(path) > MAX_PATH - 1) { 3667 errno = ENAMETOOLONG; 3668 return -1; 3669 } 3670 os::native_path(strcpy(pathbuf, path)); 3671 return ::stat(pathbuf, sbuf); 3672} 3673 3674bool os::check_heap(bool force) { 3675 return true; 3676} 3677 3678int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3679 return ::vsnprintf(buf, count, format, args); 3680} 3681 3682// Is a (classpath) directory empty? 3683bool os::dir_is_empty(const char* path) { 3684 DIR *dir = NULL; 3685 struct dirent *ptr; 3686 3687 dir = opendir(path); 3688 if (dir == NULL) return true; 3689 3690 /* Scan the directory */ 3691 bool result = true; 3692 char buf[sizeof(struct dirent) + MAX_PATH]; 3693 while (result && (ptr = ::readdir(dir)) != NULL) { 3694 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3695 result = false; 3696 } 3697 } 3698 closedir(dir); 3699 return result; 3700} 3701 3702// This code originates from JDK's sysOpen and open64_w 3703// from src/solaris/hpi/src/system_md.c 3704 3705#ifndef O_DELETE 3706#define O_DELETE 0x10000 3707#endif 3708 3709// Open a file. Unlink the file immediately after open returns 3710// if the specified oflag has the O_DELETE flag set. 3711// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3712 3713int os::open(const char *path, int oflag, int mode) { 3714 3715 if (strlen(path) > MAX_PATH - 1) { 3716 errno = ENAMETOOLONG; 3717 return -1; 3718 } 3719 int fd; 3720 int o_delete = (oflag & O_DELETE); 3721 oflag = oflag & ~O_DELETE; 3722 3723 fd = ::open(path, oflag, mode); 3724 if (fd == -1) return -1; 3725 3726 //If the open succeeded, the file might still be a directory 3727 { 3728 struct stat buf; 3729 int ret = ::fstat(fd, &buf); 3730 int st_mode = buf.st_mode; 3731 3732 if (ret != -1) { 3733 if ((st_mode & S_IFMT) == S_IFDIR) { 3734 errno = EISDIR; 3735 ::close(fd); 3736 return -1; 3737 } 3738 } else { 3739 ::close(fd); 3740 return -1; 3741 } 3742 } 3743 3744 /* 3745 * All file descriptors that are opened in the JVM and not 3746 * specifically destined for a subprocess should have the 3747 * close-on-exec flag set. If we don't set it, then careless 3rd 3748 * party native code might fork and exec without closing all 3749 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3750 * UNIXProcess.c), and this in turn might: 3751 * 3752 * - cause end-of-file to fail to be detected on some file 3753 * descriptors, resulting in mysterious hangs, or 3754 * 3755 * - might cause an fopen in the subprocess to fail on a system 3756 * suffering from bug 1085341. 3757 * 3758 * (Yes, the default setting of the close-on-exec flag is a Unix 3759 * design flaw) 3760 * 3761 * See: 3762 * 1085341: 32-bit stdio routines should support file descriptors >255 3763 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3764 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3765 */ 3766#ifdef FD_CLOEXEC 3767 { 3768 int flags = ::fcntl(fd, F_GETFD); 3769 if (flags != -1) 3770 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3771 } 3772#endif 3773 3774 if (o_delete != 0) { 3775 ::unlink(path); 3776 } 3777 return fd; 3778} 3779 3780 3781// create binary file, rewriting existing file if required 3782int os::create_binary_file(const char* path, bool rewrite_existing) { 3783 int oflags = O_WRONLY | O_CREAT; 3784 if (!rewrite_existing) { 3785 oflags |= O_EXCL; 3786 } 3787 return ::open(path, oflags, S_IREAD | S_IWRITE); 3788} 3789 3790// return current position of file pointer 3791jlong os::current_file_offset(int fd) { 3792 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3793} 3794 3795// move file pointer to the specified offset 3796jlong os::seek_to_file_offset(int fd, jlong offset) { 3797 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3798} 3799 3800// This code originates from JDK's sysAvailable 3801// from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3802 3803int os::available(int fd, jlong *bytes) { 3804 jlong cur, end; 3805 int mode; 3806 struct stat buf; 3807 3808 if (::fstat(fd, &buf) >= 0) { 3809 mode = buf.st_mode; 3810 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3811 /* 3812 * XXX: is the following call interruptible? If so, this might 3813 * need to go through the INTERRUPT_IO() wrapper as for other 3814 * blocking, interruptible calls in this file. 3815 */ 3816 int n; 3817 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3818 *bytes = n; 3819 return 1; 3820 } 3821 } 3822 } 3823 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3824 return 0; 3825 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3826 return 0; 3827 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3828 return 0; 3829 } 3830 *bytes = end - cur; 3831 return 1; 3832} 3833 3834int os::socket_available(int fd, jint *pbytes) { 3835 if (fd < 0) 3836 return OS_OK; 3837 3838 int ret; 3839 3840 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 3841 3842 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 3843 // is expected to return 0 on failure and 1 on success to the jdk. 3844 3845 return (ret == OS_ERR) ? 0 : 1; 3846} 3847 3848// Map a block of memory. 3849char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3850 char *addr, size_t bytes, bool read_only, 3851 bool allow_exec) { 3852 int prot; 3853 int flags; 3854 3855 if (read_only) { 3856 prot = PROT_READ; 3857 flags = MAP_SHARED; 3858 } else { 3859 prot = PROT_READ | PROT_WRITE; 3860 flags = MAP_PRIVATE; 3861 } 3862 3863 if (allow_exec) { 3864 prot |= PROT_EXEC; 3865 } 3866 3867 if (addr != NULL) { 3868 flags |= MAP_FIXED; 3869 } 3870 3871 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3872 fd, file_offset); 3873 if (mapped_address == MAP_FAILED) { 3874 return NULL; 3875 } 3876 return mapped_address; 3877} 3878 3879 3880// Remap a block of memory. 3881char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3882 char *addr, size_t bytes, bool read_only, 3883 bool allow_exec) { 3884 // same as map_memory() on this OS 3885 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3886 allow_exec); 3887} 3888 3889 3890// Unmap a block of memory. 3891bool os::pd_unmap_memory(char* addr, size_t bytes) { 3892 return munmap(addr, bytes) == 0; 3893} 3894 3895// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3896// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3897// of a thread. 3898// 3899// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3900// the fast estimate available on the platform. 3901 3902jlong os::current_thread_cpu_time() { 3903#ifdef __APPLE__ 3904 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3905#else 3906 Unimplemented(); 3907 return 0; 3908#endif 3909} 3910 3911jlong os::thread_cpu_time(Thread* thread) { 3912#ifdef __APPLE__ 3913 return os::thread_cpu_time(thread, true /* user + sys */); 3914#else 3915 Unimplemented(); 3916 return 0; 3917#endif 3918} 3919 3920jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3921#ifdef __APPLE__ 3922 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3923#else 3924 Unimplemented(); 3925 return 0; 3926#endif 3927} 3928 3929jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3930#ifdef __APPLE__ 3931 struct thread_basic_info tinfo; 3932 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3933 kern_return_t kr; 3934 thread_t mach_thread; 3935 3936 mach_thread = thread->osthread()->thread_id(); 3937 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3938 if (kr != KERN_SUCCESS) 3939 return -1; 3940 3941 if (user_sys_cpu_time) { 3942 jlong nanos; 3943 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3944 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3945 return nanos; 3946 } else { 3947 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3948 } 3949#else 3950 Unimplemented(); 3951 return 0; 3952#endif 3953} 3954 3955 3956void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3957 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3958 info_ptr->may_skip_backward = false; // elapsed time not wall time 3959 info_ptr->may_skip_forward = false; // elapsed time not wall time 3960 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3961} 3962 3963void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3964 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3965 info_ptr->may_skip_backward = false; // elapsed time not wall time 3966 info_ptr->may_skip_forward = false; // elapsed time not wall time 3967 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3968} 3969 3970bool os::is_thread_cpu_time_supported() { 3971#ifdef __APPLE__ 3972 return true; 3973#else 3974 return false; 3975#endif 3976} 3977 3978// System loadavg support. Returns -1 if load average cannot be obtained. 3979// Bsd doesn't yet have a (official) notion of processor sets, 3980// so just return the system wide load average. 3981int os::loadavg(double loadavg[], int nelem) { 3982 return ::getloadavg(loadavg, nelem); 3983} 3984 3985void os::pause() { 3986 char filename[MAX_PATH]; 3987 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3988 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3989 } else { 3990 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3991 } 3992 3993 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3994 if (fd != -1) { 3995 struct stat buf; 3996 ::close(fd); 3997 while (::stat(filename, &buf) == 0) { 3998 (void)::poll(NULL, 0, 100); 3999 } 4000 } else { 4001 jio_fprintf(stderr, 4002 "Could not open pause file '%s', continuing immediately.\n", filename); 4003 } 4004} 4005 4006 4007// Refer to the comments in os_solaris.cpp park-unpark. 4008// 4009// Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 4010// hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 4011// For specifics regarding the bug see GLIBC BUGID 261237 : 4012// http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 4013// Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 4014// will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4015// is used. (The simple C test-case provided in the GLIBC bug report manifests the 4016// hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4017// and monitorenter when we're using 1-0 locking. All those operations may result in 4018// calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4019// of libpthread avoids the problem, but isn't practical. 4020// 4021// Possible remedies: 4022// 4023// 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4024// This is palliative and probabilistic, however. If the thread is preempted 4025// between the call to compute_abstime() and pthread_cond_timedwait(), more 4026// than the minimum period may have passed, and the abstime may be stale (in the 4027// past) resultin in a hang. Using this technique reduces the odds of a hang 4028// but the JVM is still vulnerable, particularly on heavily loaded systems. 4029// 4030// 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4031// of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4032// NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4033// reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4034// thread. 4035// 4036// 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4037// that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4038// a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4039// This also works well. In fact it avoids kernel-level scalability impediments 4040// on certain platforms that don't handle lots of active pthread_cond_timedwait() 4041// timers in a graceful fashion. 4042// 4043// 4. When the abstime value is in the past it appears that control returns 4044// correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4045// Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4046// can avoid the problem by reinitializing the condvar -- by cond_destroy() 4047// followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4048// It may be possible to avoid reinitialization by checking the return 4049// value from pthread_cond_timedwait(). In addition to reinitializing the 4050// condvar we must establish the invariant that cond_signal() is only called 4051// within critical sections protected by the adjunct mutex. This prevents 4052// cond_signal() from "seeing" a condvar that's in the midst of being 4053// reinitialized or that is corrupt. Sadly, this invariant obviates the 4054// desirable signal-after-unlock optimization that avoids futile context switching. 4055// 4056// I'm also concerned that some versions of NTPL might allocate an auxilliary 4057// structure when a condvar is used or initialized. cond_destroy() would 4058// release the helper structure. Our reinitialize-after-timedwait fix 4059// put excessive stress on malloc/free and locks protecting the c-heap. 4060// 4061// We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4062// It may be possible to refine (4) by checking the kernel and NTPL verisons 4063// and only enabling the work-around for vulnerable environments. 4064 4065// utility to compute the abstime argument to timedwait: 4066// millis is the relative timeout time 4067// abstime will be the absolute timeout time 4068// TODO: replace compute_abstime() with unpackTime() 4069 4070static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4071 if (millis < 0) millis = 0; 4072 struct timeval now; 4073 int status = gettimeofday(&now, NULL); 4074 assert(status == 0, "gettimeofday"); 4075 jlong seconds = millis / 1000; 4076 millis %= 1000; 4077 if (seconds > 50000000) { // see man cond_timedwait(3T) 4078 seconds = 50000000; 4079 } 4080 abstime->tv_sec = now.tv_sec + seconds; 4081 long usec = now.tv_usec + millis * 1000; 4082 if (usec >= 1000000) { 4083 abstime->tv_sec += 1; 4084 usec -= 1000000; 4085 } 4086 abstime->tv_nsec = usec * 1000; 4087 return abstime; 4088} 4089 4090 4091// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4092// Conceptually TryPark() should be equivalent to park(0). 4093 4094int os::PlatformEvent::TryPark() { 4095 for (;;) { 4096 const int v = _Event ; 4097 guarantee ((v == 0) || (v == 1), "invariant") ; 4098 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4099 } 4100} 4101 4102void os::PlatformEvent::park() { // AKA "down()" 4103 // Invariant: Only the thread associated with the Event/PlatformEvent 4104 // may call park(). 4105 // TODO: assert that _Assoc != NULL or _Assoc == Self 4106 int v ; 4107 for (;;) { 4108 v = _Event ; 4109 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4110 } 4111 guarantee (v >= 0, "invariant") ; 4112 if (v == 0) { 4113 // Do this the hard way by blocking ... 4114 int status = pthread_mutex_lock(_mutex); 4115 assert_status(status == 0, status, "mutex_lock"); 4116 guarantee (_nParked == 0, "invariant") ; 4117 ++ _nParked ; 4118 while (_Event < 0) { 4119 status = pthread_cond_wait(_cond, _mutex); 4120 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4121 // Treat this the same as if the wait was interrupted 4122 if (status == ETIMEDOUT) { status = EINTR; } 4123 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4124 } 4125 -- _nParked ; 4126 4127 _Event = 0 ; 4128 status = pthread_mutex_unlock(_mutex); 4129 assert_status(status == 0, status, "mutex_unlock"); 4130 // Paranoia to ensure our locked and lock-free paths interact 4131 // correctly with each other. 4132 OrderAccess::fence(); 4133 } 4134 guarantee (_Event >= 0, "invariant") ; 4135} 4136 4137int os::PlatformEvent::park(jlong millis) { 4138 guarantee (_nParked == 0, "invariant") ; 4139 4140 int v ; 4141 for (;;) { 4142 v = _Event ; 4143 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4144 } 4145 guarantee (v >= 0, "invariant") ; 4146 if (v != 0) return OS_OK ; 4147 4148 // We do this the hard way, by blocking the thread. 4149 // Consider enforcing a minimum timeout value. 4150 struct timespec abst; 4151 compute_abstime(&abst, millis); 4152 4153 int ret = OS_TIMEOUT; 4154 int status = pthread_mutex_lock(_mutex); 4155 assert_status(status == 0, status, "mutex_lock"); 4156 guarantee (_nParked == 0, "invariant") ; 4157 ++_nParked ; 4158 4159 // Object.wait(timo) will return because of 4160 // (a) notification 4161 // (b) timeout 4162 // (c) thread.interrupt 4163 // 4164 // Thread.interrupt and object.notify{All} both call Event::set. 4165 // That is, we treat thread.interrupt as a special case of notification. 4166 // The underlying Solaris implementation, cond_timedwait, admits 4167 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4168 // JVM from making those visible to Java code. As such, we must 4169 // filter out spurious wakeups. We assume all ETIME returns are valid. 4170 // 4171 // TODO: properly differentiate simultaneous notify+interrupt. 4172 // In that case, we should propagate the notify to another waiter. 4173 4174 while (_Event < 0) { 4175 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4176 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4177 pthread_cond_destroy (_cond); 4178 pthread_cond_init (_cond, NULL) ; 4179 } 4180 assert_status(status == 0 || status == EINTR || 4181 status == ETIMEDOUT, 4182 status, "cond_timedwait"); 4183 if (!FilterSpuriousWakeups) break ; // previous semantics 4184 if (status == ETIMEDOUT) break ; 4185 // We consume and ignore EINTR and spurious wakeups. 4186 } 4187 --_nParked ; 4188 if (_Event >= 0) { 4189 ret = OS_OK; 4190 } 4191 _Event = 0 ; 4192 status = pthread_mutex_unlock(_mutex); 4193 assert_status(status == 0, status, "mutex_unlock"); 4194 assert (_nParked == 0, "invariant") ; 4195 // Paranoia to ensure our locked and lock-free paths interact 4196 // correctly with each other. 4197 OrderAccess::fence(); 4198 return ret; 4199} 4200 4201void os::PlatformEvent::unpark() { 4202 // Transitions for _Event: 4203 // 0 :=> 1 4204 // 1 :=> 1 4205 // -1 :=> either 0 or 1; must signal target thread 4206 // That is, we can safely transition _Event from -1 to either 4207 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4208 // unpark() calls. 4209 // See also: "Semaphores in Plan 9" by Mullender & Cox 4210 // 4211 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4212 // that it will take two back-to-back park() calls for the owning 4213 // thread to block. This has the benefit of forcing a spurious return 4214 // from the first park() call after an unpark() call which will help 4215 // shake out uses of park() and unpark() without condition variables. 4216 4217 if (Atomic::xchg(1, &_Event) >= 0) return; 4218 4219 // Wait for the thread associated with the event to vacate 4220 int status = pthread_mutex_lock(_mutex); 4221 assert_status(status == 0, status, "mutex_lock"); 4222 int AnyWaiters = _nParked; 4223 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4224 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4225 AnyWaiters = 0; 4226 pthread_cond_signal(_cond); 4227 } 4228 status = pthread_mutex_unlock(_mutex); 4229 assert_status(status == 0, status, "mutex_unlock"); 4230 if (AnyWaiters != 0) { 4231 status = pthread_cond_signal(_cond); 4232 assert_status(status == 0, status, "cond_signal"); 4233 } 4234 4235 // Note that we signal() _after dropping the lock for "immortal" Events. 4236 // This is safe and avoids a common class of futile wakeups. In rare 4237 // circumstances this can cause a thread to return prematurely from 4238 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4239 // simply re-test the condition and re-park itself. 4240} 4241 4242 4243// JSR166 4244// ------------------------------------------------------- 4245 4246/* 4247 * The solaris and bsd implementations of park/unpark are fairly 4248 * conservative for now, but can be improved. They currently use a 4249 * mutex/condvar pair, plus a a count. 4250 * Park decrements count if > 0, else does a condvar wait. Unpark 4251 * sets count to 1 and signals condvar. Only one thread ever waits 4252 * on the condvar. Contention seen when trying to park implies that someone 4253 * is unparking you, so don't wait. And spurious returns are fine, so there 4254 * is no need to track notifications. 4255 */ 4256 4257#define MAX_SECS 100000000 4258/* 4259 * This code is common to bsd and solaris and will be moved to a 4260 * common place in dolphin. 4261 * 4262 * The passed in time value is either a relative time in nanoseconds 4263 * or an absolute time in milliseconds. Either way it has to be unpacked 4264 * into suitable seconds and nanoseconds components and stored in the 4265 * given timespec structure. 4266 * Given time is a 64-bit value and the time_t used in the timespec is only 4267 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4268 * overflow if times way in the future are given. Further on Solaris versions 4269 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4270 * number of seconds, in abstime, is less than current_time + 100,000,000. 4271 * As it will be 28 years before "now + 100000000" will overflow we can 4272 * ignore overflow and just impose a hard-limit on seconds using the value 4273 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4274 * years from "now". 4275 */ 4276 4277static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4278 assert (time > 0, "convertTime"); 4279 4280 struct timeval now; 4281 int status = gettimeofday(&now, NULL); 4282 assert(status == 0, "gettimeofday"); 4283 4284 time_t max_secs = now.tv_sec + MAX_SECS; 4285 4286 if (isAbsolute) { 4287 jlong secs = time / 1000; 4288 if (secs > max_secs) { 4289 absTime->tv_sec = max_secs; 4290 } 4291 else { 4292 absTime->tv_sec = secs; 4293 } 4294 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4295 } 4296 else { 4297 jlong secs = time / NANOSECS_PER_SEC; 4298 if (secs >= MAX_SECS) { 4299 absTime->tv_sec = max_secs; 4300 absTime->tv_nsec = 0; 4301 } 4302 else { 4303 absTime->tv_sec = now.tv_sec + secs; 4304 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4305 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4306 absTime->tv_nsec -= NANOSECS_PER_SEC; 4307 ++absTime->tv_sec; // note: this must be <= max_secs 4308 } 4309 } 4310 } 4311 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4312 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4313 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4314 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4315} 4316 4317void Parker::park(bool isAbsolute, jlong time) { 4318 // Ideally we'd do something useful while spinning, such 4319 // as calling unpackTime(). 4320 4321 // Optional fast-path check: 4322 // Return immediately if a permit is available. 4323 // We depend on Atomic::xchg() having full barrier semantics 4324 // since we are doing a lock-free update to _counter. 4325 if (Atomic::xchg(0, &_counter) > 0) return; 4326 4327 Thread* thread = Thread::current(); 4328 assert(thread->is_Java_thread(), "Must be JavaThread"); 4329 JavaThread *jt = (JavaThread *)thread; 4330 4331 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4332 // Check interrupt before trying to wait 4333 if (Thread::is_interrupted(thread, false)) { 4334 return; 4335 } 4336 4337 // Next, demultiplex/decode time arguments 4338 struct timespec absTime; 4339 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4340 return; 4341 } 4342 if (time > 0) { 4343 unpackTime(&absTime, isAbsolute, time); 4344 } 4345 4346 4347 // Enter safepoint region 4348 // Beware of deadlocks such as 6317397. 4349 // The per-thread Parker:: mutex is a classic leaf-lock. 4350 // In particular a thread must never block on the Threads_lock while 4351 // holding the Parker:: mutex. If safepoints are pending both the 4352 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4353 ThreadBlockInVM tbivm(jt); 4354 4355 // Don't wait if cannot get lock since interference arises from 4356 // unblocking. Also. check interrupt before trying wait 4357 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4358 return; 4359 } 4360 4361 int status ; 4362 if (_counter > 0) { // no wait needed 4363 _counter = 0; 4364 status = pthread_mutex_unlock(_mutex); 4365 assert (status == 0, "invariant") ; 4366 // Paranoia to ensure our locked and lock-free paths interact 4367 // correctly with each other and Java-level accesses. 4368 OrderAccess::fence(); 4369 return; 4370 } 4371 4372#ifdef ASSERT 4373 // Don't catch signals while blocked; let the running threads have the signals. 4374 // (This allows a debugger to break into the running thread.) 4375 sigset_t oldsigs; 4376 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4377 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4378#endif 4379 4380 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4381 jt->set_suspend_equivalent(); 4382 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4383 4384 if (time == 0) { 4385 status = pthread_cond_wait (_cond, _mutex) ; 4386 } else { 4387 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4388 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4389 pthread_cond_destroy (_cond) ; 4390 pthread_cond_init (_cond, NULL); 4391 } 4392 } 4393 assert_status(status == 0 || status == EINTR || 4394 status == ETIMEDOUT, 4395 status, "cond_timedwait"); 4396 4397#ifdef ASSERT 4398 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4399#endif 4400 4401 _counter = 0 ; 4402 status = pthread_mutex_unlock(_mutex) ; 4403 assert_status(status == 0, status, "invariant") ; 4404 // Paranoia to ensure our locked and lock-free paths interact 4405 // correctly with each other and Java-level accesses. 4406 OrderAccess::fence(); 4407 4408 // If externally suspended while waiting, re-suspend 4409 if (jt->handle_special_suspend_equivalent_condition()) { 4410 jt->java_suspend_self(); 4411 } 4412} 4413 4414void Parker::unpark() { 4415 int s, status ; 4416 status = pthread_mutex_lock(_mutex); 4417 assert (status == 0, "invariant") ; 4418 s = _counter; 4419 _counter = 1; 4420 if (s < 1) { 4421 if (WorkAroundNPTLTimedWaitHang) { 4422 status = pthread_cond_signal (_cond) ; 4423 assert (status == 0, "invariant") ; 4424 status = pthread_mutex_unlock(_mutex); 4425 assert (status == 0, "invariant") ; 4426 } else { 4427 status = pthread_mutex_unlock(_mutex); 4428 assert (status == 0, "invariant") ; 4429 status = pthread_cond_signal (_cond) ; 4430 assert (status == 0, "invariant") ; 4431 } 4432 } else { 4433 pthread_mutex_unlock(_mutex); 4434 assert (status == 0, "invariant") ; 4435 } 4436} 4437 4438 4439/* Darwin has no "environ" in a dynamic library. */ 4440#ifdef __APPLE__ 4441#include <crt_externs.h> 4442#define environ (*_NSGetEnviron()) 4443#else 4444extern char** environ; 4445#endif 4446 4447// Run the specified command in a separate process. Return its exit value, 4448// or -1 on failure (e.g. can't fork a new process). 4449// Unlike system(), this function can be called from signal handler. It 4450// doesn't block SIGINT et al. 4451int os::fork_and_exec(char* cmd) { 4452 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4453 4454 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4455 // pthread_atfork handlers and reset pthread library. All we need is a 4456 // separate process to execve. Make a direct syscall to fork process. 4457 // On IA64 there's no fork syscall, we have to use fork() and hope for 4458 // the best... 4459 pid_t pid = fork(); 4460 4461 if (pid < 0) { 4462 // fork failed 4463 return -1; 4464 4465 } else if (pid == 0) { 4466 // child process 4467 4468 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4469 // first to kill every thread on the thread list. Because this list is 4470 // not reset by fork() (see notes above), execve() will instead kill 4471 // every thread in the parent process. We know this is the only thread 4472 // in the new process, so make a system call directly. 4473 // IA64 should use normal execve() from glibc to match the glibc fork() 4474 // above. 4475 execve("/bin/sh", (char* const*)argv, environ); 4476 4477 // execve failed 4478 _exit(-1); 4479 4480 } else { 4481 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4482 // care about the actual exit code, for now. 4483 4484 int status; 4485 4486 // Wait for the child process to exit. This returns immediately if 4487 // the child has already exited. */ 4488 while (waitpid(pid, &status, 0) < 0) { 4489 switch (errno) { 4490 case ECHILD: return 0; 4491 case EINTR: break; 4492 default: return -1; 4493 } 4494 } 4495 4496 if (WIFEXITED(status)) { 4497 // The child exited normally; get its exit code. 4498 return WEXITSTATUS(status); 4499 } else if (WIFSIGNALED(status)) { 4500 // The child exited because of a signal 4501 // The best value to return is 0x80 + signal number, 4502 // because that is what all Unix shells do, and because 4503 // it allows callers to distinguish between process exit and 4504 // process death by signal. 4505 return 0x80 + WTERMSIG(status); 4506 } else { 4507 // Unknown exit code; pass it through 4508 return status; 4509 } 4510 } 4511} 4512 4513// is_headless_jre() 4514// 4515// Test for the existence of xawt/libmawt.so or libawt_xawt.so 4516// in order to report if we are running in a headless jre 4517// 4518// Since JDK8 xawt/libmawt.so was moved into the same directory 4519// as libawt.so, and renamed libawt_xawt.so 4520// 4521bool os::is_headless_jre() { 4522 struct stat statbuf; 4523 char buf[MAXPATHLEN]; 4524 char libmawtpath[MAXPATHLEN]; 4525 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4526 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4527 char *p; 4528 4529 // Get path to libjvm.so 4530 os::jvm_path(buf, sizeof(buf)); 4531 4532 // Get rid of libjvm.so 4533 p = strrchr(buf, '/'); 4534 if (p == NULL) return false; 4535 else *p = '\0'; 4536 4537 // Get rid of client or server 4538 p = strrchr(buf, '/'); 4539 if (p == NULL) return false; 4540 else *p = '\0'; 4541 4542 // check xawt/libmawt.so 4543 strcpy(libmawtpath, buf); 4544 strcat(libmawtpath, xawtstr); 4545 if (::stat(libmawtpath, &statbuf) == 0) return false; 4546 4547 // check libawt_xawt.so 4548 strcpy(libmawtpath, buf); 4549 strcat(libmawtpath, new_xawtstr); 4550 if (::stat(libmawtpath, &statbuf) == 0) return false; 4551 4552 return true; 4553} 4554 4555// Get the default path to the core file 4556// Returns the length of the string 4557int os::get_core_path(char* buffer, size_t bufferSize) { 4558 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4559 4560 // Truncate if theoretical string was longer than bufferSize 4561 n = MIN2(n, (int)bufferSize); 4562 4563 return n; 4564} 4565