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