1 /* 2 * Copyright (c) 1999, 2012, 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/runtimeService.hpp" 61 #include "utilities/decoder.hpp" 62 #include "utilities/defaultStream.hpp" 63 #include "utilities/events.hpp" 64 #include "utilities/growableArray.hpp" 65 #include "utilities/vmError.hpp" 66 67 // put OS-includes here 68 # include <sys/types.h> 69 # include <sys/mman.h> 70 # include <sys/stat.h> 71 # include <sys/select.h> 72 # include <pthread.h> 73 # include <signal.h> 74 # include <errno.h> 75 # include <dlfcn.h> 76 # include <stdio.h> 77 # include <unistd.h> 78 # include <sys/resource.h> 79 # include <pthread.h> 80 # include <sys/stat.h> 81 # include <sys/time.h> 82 # include <sys/times.h> 83 # include <sys/utsname.h> 84 # include <sys/socket.h> 85 # include <sys/wait.h> 86 # include <time.h> 87 # include <pwd.h> 88 # include <poll.h> 89 # include <semaphore.h> 90 # include <fcntl.h> 91 # include <string.h> 92 # include <sys/param.h> 93 # include <sys/sysctl.h> 94 # include <sys/ipc.h> 95 # include <sys/shm.h> 96 #ifndef __APPLE__ 97 # include <link.h> 98 #endif 99 # include <stdint.h> 100 # include <inttypes.h> 101 # include <sys/ioctl.h> 102 103 #if defined(__FreeBSD__) || defined(__NetBSD__) 104 # include <elf.h> 105 #endif 106 107 #ifdef __APPLE__ 108 # include <mach/mach.h> // semaphore_* API 109 # include <mach-o/dyld.h> 110 # include <sys/proc_info.h> 111 # include <objc/objc-auto.h> 112 #endif 113 114 #ifndef MAP_ANONYMOUS 115 #define MAP_ANONYMOUS MAP_ANON 116 #endif 117 118 #define MAX_PATH (2 * K) 119 120 // for timer info max values which include all bits 121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122 123 #define LARGEPAGES_BIT (1 << 6) 124 //////////////////////////////////////////////////////////////////////////////// 125 // global variables 126 julong os::Bsd::_physical_memory = 0; 127 128 129 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 130 pthread_t os::Bsd::_main_thread; 131 int os::Bsd::_page_size = -1; 132 133 static jlong initial_time_count=0; 134 135 static int clock_tics_per_sec = 100; 136 137 // For diagnostics to print a message once. see run_periodic_checks 138 static sigset_t check_signal_done; 139 static bool check_signals = true; 140 141 static pid_t _initial_pid = 0; 142 143 /* Signal number used to suspend/resume a thread */ 144 145 /* do not use any signal number less than SIGSEGV, see 4355769 */ 146 static int SR_signum = SIGUSR2; 147 sigset_t SR_sigset; 148 149 150 //////////////////////////////////////////////////////////////////////////////// 151 // utility functions 152 153 static int SR_initialize(); 154 static int SR_finalize(); 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 julong os::allocatable_physical_memory(julong size) { 170 #ifdef _LP64 171 return size; 172 #else 173 julong result = MIN2(size, (julong)3800*M); 174 if (!is_allocatable(result)) { 175 // See comments under solaris for alignment considerations 176 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); 177 result = MIN2(size, reasonable_size); 178 } 179 return result; 180 #endif // _LP64 181 } 182 183 //////////////////////////////////////////////////////////////////////////////// 184 // environment support 185 186 bool os::getenv(const char* name, char* buf, int len) { 187 const char* val = ::getenv(name); 188 if (val != NULL && strlen(val) < (size_t)len) { 189 strcpy(buf, val); 190 return true; 191 } 192 if (len > 0) buf[0] = 0; // return a null string 193 return false; 194 } 195 196 197 // Return true if user is running as root. 198 199 bool os::have_special_privileges() { 200 static bool init = false; 201 static bool privileges = false; 202 if (!init) { 203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 204 init = true; 205 } 206 return privileges; 207 } 208 209 210 211 // Cpu architecture string 212 #if defined(ZERO) 213 static char cpu_arch[] = ZERO_LIBARCH; 214 #elif defined(IA64) 215 static char cpu_arch[] = "ia64"; 216 #elif defined(IA32) 217 static char cpu_arch[] = "i386"; 218 #elif defined(AMD64) 219 static char cpu_arch[] = "amd64"; 220 #elif defined(ARM) 221 static char cpu_arch[] = "arm"; 222 #elif defined(PPC) 223 static char cpu_arch[] = "ppc"; 224 #elif defined(SPARC) 225 # ifdef _LP64 226 static char cpu_arch[] = "sparcv9"; 227 # else 228 static char cpu_arch[] = "sparc"; 229 # endif 230 #else 231 #error Add appropriate cpu_arch setting 232 #endif 233 234 // Compiler variant 235 #ifdef COMPILER2 236 #define COMPILER_VARIANT "server" 237 #else 238 #define COMPILER_VARIANT "client" 239 #endif 240 241 242 void os::Bsd::initialize_system_info() { 243 int mib[2]; 244 size_t len; 245 int cpu_val; 246 u_long mem_val; 247 248 /* get processors count via hw.ncpus sysctl */ 249 mib[0] = CTL_HW; 250 mib[1] = HW_NCPU; 251 len = sizeof(cpu_val); 252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 253 set_processor_count(cpu_val); 254 } 255 else { 256 set_processor_count(1); // fallback 257 } 258 259 /* get physical memory via hw.usermem sysctl (hw.usermem is used 260 * instead of hw.physmem because we need size of allocatable memory 261 */ 262 mib[0] = CTL_HW; 263 mib[1] = HW_USERMEM; 264 len = sizeof(mem_val); 265 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) 266 _physical_memory = mem_val; 267 else 268 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 269 270 #ifdef __OpenBSD__ 271 { 272 // limit _physical_memory memory view on OpenBSD since 273 // datasize rlimit restricts us anyway. 274 struct rlimit limits; 275 getrlimit(RLIMIT_DATA, &limits); 276 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 277 } 278 #endif 279 } 280 281 #ifdef __APPLE__ 282 static const char *get_home() { 283 const char *home_dir = ::getenv("HOME"); 284 if ((home_dir == NULL) || (*home_dir == '\0')) { 285 struct passwd *passwd_info = getpwuid(geteuid()); 286 if (passwd_info != NULL) { 287 home_dir = passwd_info->pw_dir; 288 } 289 } 290 291 return home_dir; 292 } 293 #endif 294 295 void os::init_system_properties_values() { 296 // char arch[12]; 297 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 298 299 // The next steps are taken in the product version: 300 // 301 // Obtain the JAVA_HOME value from the location of libjvm.so. 302 // This library should be located at: 303 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 304 // 305 // If "/jre/lib/" appears at the right place in the path, then we 306 // assume libjvm.so is installed in a JDK and we use this path. 307 // 308 // Otherwise exit with message: "Could not create the Java virtual machine." 309 // 310 // The following extra steps are taken in the debugging version: 311 // 312 // If "/jre/lib/" does NOT appear at the right place in the path 313 // instead of exit check for $JAVA_HOME environment variable. 314 // 315 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 316 // then we append a fake suffix "hotspot/libjvm.so" to this path so 317 // it looks like libjvm.so is installed there 318 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 319 // 320 // Otherwise exit. 321 // 322 // Important note: if the location of libjvm.so changes this 323 // code needs to be changed accordingly. 324 325 // The next few definitions allow the code to be verbatim: 326 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 327 #define getenv(n) ::getenv(n) 328 329 /* 330 * See ld(1): 331 * The linker uses the following search paths to locate required 332 * shared libraries: 333 * 1: ... 334 * ... 335 * 7: The default directories, normally /lib and /usr/lib. 336 */ 337 #ifndef DEFAULT_LIBPATH 338 #define DEFAULT_LIBPATH "/lib:/usr/lib" 339 #endif 340 341 #define EXTENSIONS_DIR "/lib/ext" 342 #define ENDORSED_DIR "/lib/endorsed" 343 #define REG_DIR "/usr/java/packages" 344 345 #ifdef __APPLE__ 346 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 347 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 348 const char *user_home_dir = get_home(); 349 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 350 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 351 sizeof(SYS_EXTENSIONS_DIRS); 352 #endif 353 354 { 355 /* sysclasspath, java_home, dll_dir */ 356 { 357 char *home_path; 358 char *dll_path; 359 char *pslash; 360 char buf[MAXPATHLEN]; 361 os::jvm_path(buf, sizeof(buf)); 362 363 // Found the full path to libjvm.so. 364 // Now cut the path to <java_home>/jre if we can. 365 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 366 pslash = strrchr(buf, '/'); 367 if (pslash != NULL) 368 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 369 dll_path = malloc(strlen(buf) + 1); 370 if (dll_path == NULL) 371 return; 372 strcpy(dll_path, buf); 373 Arguments::set_dll_dir(dll_path); 374 375 if (pslash != NULL) { 376 pslash = strrchr(buf, '/'); 377 if (pslash != NULL) { 378 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 379 #ifndef __APPLE__ 380 pslash = strrchr(buf, '/'); 381 if (pslash != NULL) 382 *pslash = '\0'; /* get rid of /lib */ 383 #endif 384 } 385 } 386 387 home_path = malloc(strlen(buf) + 1); 388 if (home_path == NULL) 389 return; 390 strcpy(home_path, buf); 391 Arguments::set_java_home(home_path); 392 393 if (!set_boot_path('/', ':')) 394 return; 395 } 396 397 /* 398 * Where to look for native libraries 399 * 400 * Note: Due to a legacy implementation, most of the library path 401 * is set in the launcher. This was to accomodate linking restrictions 402 * on legacy Bsd implementations (which are no longer supported). 403 * Eventually, all the library path setting will be done here. 404 * 405 * However, to prevent the proliferation of improperly built native 406 * libraries, the new path component /usr/java/packages is added here. 407 * Eventually, all the library path setting will be done here. 408 */ 409 { 410 char *ld_library_path; 411 412 /* 413 * Construct the invariant part of ld_library_path. Note that the 414 * space for the colon and the trailing null are provided by the 415 * nulls included by the sizeof operator (so actually we allocate 416 * a byte more than necessary). 417 */ 418 #ifdef __APPLE__ 419 ld_library_path = (char *) malloc(system_ext_size); 420 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 421 #else 422 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 423 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 424 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 425 #endif 426 427 /* 428 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 429 * should always exist (until the legacy problem cited above is 430 * addressed). 431 */ 432 #ifdef __APPLE__ 433 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 434 char *l = getenv("JAVA_LIBRARY_PATH"); 435 if (l != NULL) { 436 char *t = ld_library_path; 437 /* That's +1 for the colon and +1 for the trailing '\0' */ 438 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 439 sprintf(ld_library_path, "%s:%s", l, t); 440 free(t); 441 } 442 443 char *v = getenv("DYLD_LIBRARY_PATH"); 444 #else 445 char *v = getenv("LD_LIBRARY_PATH"); 446 #endif 447 if (v != NULL) { 448 char *t = ld_library_path; 449 /* That's +1 for the colon and +1 for the trailing '\0' */ 450 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 451 sprintf(ld_library_path, "%s:%s", v, t); 452 free(t); 453 } 454 455 #ifdef __APPLE__ 456 // Apple's Java6 has "." at the beginning of java.library.path. 457 // OpenJDK on Windows has "." at the end of java.library.path. 458 // OpenJDK on Linux and Solaris don't have "." in java.library.path 459 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 460 // "." is appended to the end of java.library.path. Yes, this 461 // could cause a change in behavior, but Apple's Java6 behavior 462 // can be achieved by putting "." at the beginning of the 463 // JAVA_LIBRARY_PATH environment variable. 464 { 465 char *t = ld_library_path; 466 // that's +3 for appending ":." and the trailing '\0' 467 ld_library_path = (char *) malloc(strlen(t) + 3); 468 sprintf(ld_library_path, "%s:%s", t, "."); 469 free(t); 470 } 471 #endif 472 473 Arguments::set_library_path(ld_library_path); 474 } 475 476 /* 477 * Extensions directories. 478 * 479 * Note that the space for the colon and the trailing null are provided 480 * by the nulls included by the sizeof operator (so actually one byte more 481 * than necessary is allocated). 482 */ 483 { 484 #ifdef __APPLE__ 485 char *buf = malloc(strlen(Arguments::get_java_home()) + 486 sizeof(EXTENSIONS_DIR) + system_ext_size); 487 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 488 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 489 #else 490 char *buf = malloc(strlen(Arguments::get_java_home()) + 491 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 492 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 493 Arguments::get_java_home()); 494 #endif 495 496 Arguments::set_ext_dirs(buf); 497 } 498 499 /* Endorsed standards default directory. */ 500 { 501 char * buf; 502 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 503 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 504 Arguments::set_endorsed_dirs(buf); 505 } 506 } 507 508 #ifdef __APPLE__ 509 #undef SYS_EXTENSIONS_DIR 510 #endif 511 #undef malloc 512 #undef getenv 513 #undef EXTENSIONS_DIR 514 #undef ENDORSED_DIR 515 516 // Done 517 return; 518 } 519 520 //////////////////////////////////////////////////////////////////////////////// 521 // breakpoint support 522 523 void os::breakpoint() { 524 BREAKPOINT; 525 } 526 527 extern "C" void breakpoint() { 528 // use debugger to set breakpoint here 529 } 530 531 //////////////////////////////////////////////////////////////////////////////// 532 // signal support 533 534 debug_only(static bool signal_sets_initialized = false); 535 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 536 537 bool os::Bsd::is_sig_ignored(int sig) { 538 struct sigaction oact; 539 sigaction(sig, (struct sigaction*)NULL, &oact); 540 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 541 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 542 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 543 return true; 544 else 545 return false; 546 } 547 548 void os::Bsd::signal_sets_init() { 549 // Should also have an assertion stating we are still single-threaded. 550 assert(!signal_sets_initialized, "Already initialized"); 551 // Fill in signals that are necessarily unblocked for all threads in 552 // the VM. Currently, we unblock the following signals: 553 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 554 // by -Xrs (=ReduceSignalUsage)); 555 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 556 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 557 // the dispositions or masks wrt these signals. 558 // Programs embedding the VM that want to use the above signals for their 559 // own purposes must, at this time, use the "-Xrs" option to prevent 560 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 561 // (See bug 4345157, and other related bugs). 562 // In reality, though, unblocking these signals is really a nop, since 563 // these signals are not blocked by default. 564 sigemptyset(&unblocked_sigs); 565 sigemptyset(&allowdebug_blocked_sigs); 566 sigaddset(&unblocked_sigs, SIGILL); 567 sigaddset(&unblocked_sigs, SIGSEGV); 568 sigaddset(&unblocked_sigs, SIGBUS); 569 sigaddset(&unblocked_sigs, SIGFPE); 570 sigaddset(&unblocked_sigs, SR_signum); 571 572 if (!ReduceSignalUsage) { 573 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 574 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 575 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 576 } 577 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 578 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 579 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 580 } 581 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 582 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 583 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 584 } 585 } 586 // Fill in signals that are blocked by all but the VM thread. 587 sigemptyset(&vm_sigs); 588 if (!ReduceSignalUsage) 589 sigaddset(&vm_sigs, BREAK_SIGNAL); 590 debug_only(signal_sets_initialized = true); 591 592 } 593 594 // These are signals that are unblocked while a thread is running Java. 595 // (For some reason, they get blocked by default.) 596 sigset_t* os::Bsd::unblocked_signals() { 597 assert(signal_sets_initialized, "Not initialized"); 598 return &unblocked_sigs; 599 } 600 601 // These are the signals that are blocked while a (non-VM) thread is 602 // running Java. Only the VM thread handles these signals. 603 sigset_t* os::Bsd::vm_signals() { 604 assert(signal_sets_initialized, "Not initialized"); 605 return &vm_sigs; 606 } 607 608 // These are signals that are blocked during cond_wait to allow debugger in 609 sigset_t* os::Bsd::allowdebug_blocked_signals() { 610 assert(signal_sets_initialized, "Not initialized"); 611 return &allowdebug_blocked_sigs; 612 } 613 614 void os::Bsd::hotspot_sigmask(Thread* thread) { 615 616 //Save caller's signal mask before setting VM signal mask 617 sigset_t caller_sigmask; 618 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 619 620 OSThread* osthread = thread->osthread(); 621 osthread->set_caller_sigmask(caller_sigmask); 622 623 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 624 625 if (!ReduceSignalUsage) { 626 if (thread->is_VM_thread()) { 627 // Only the VM thread handles BREAK_SIGNAL ... 628 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 629 } else { 630 // ... all other threads block BREAK_SIGNAL 631 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 632 } 633 } 634 } 635 636 637 ////////////////////////////////////////////////////////////////////////////// 638 // create new thread 639 640 static address highest_vm_reserved_address(); 641 642 // check if it's safe to start a new thread 643 static bool _thread_safety_check(Thread* thread) { 644 return true; 645 } 646 647 #ifdef __APPLE__ 648 // library handle for calling objc_registerThreadWithCollector() 649 // without static linking to the libobjc library 650 #define OBJC_LIB "/usr/lib/libobjc.dylib" 651 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 652 typedef void (*objc_registerThreadWithCollector_t)(); 653 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 654 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 655 #endif 656 657 // Thread start routine for all newly created threads 658 static void *java_start(Thread *thread) { 659 // Try to randomize the cache line index of hot stack frames. 660 // This helps when threads of the same stack traces evict each other's 661 // cache lines. The threads can be either from the same JVM instance, or 662 // from different JVM instances. The benefit is especially true for 663 // processors with hyperthreading technology. 664 static int counter = 0; 665 int pid = os::current_process_id(); 666 alloca(((pid ^ counter++) & 7) * 128); 667 668 ThreadLocalStorage::set_thread(thread); 669 670 OSThread* osthread = thread->osthread(); 671 Monitor* sync = osthread->startThread_lock(); 672 673 // non floating stack BsdThreads needs extra check, see above 674 if (!_thread_safety_check(thread)) { 675 // notify parent thread 676 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 677 osthread->set_state(ZOMBIE); 678 sync->notify_all(); 679 return NULL; 680 } 681 682 #ifdef __APPLE__ 683 // thread_id is mach thread on macos 684 osthread->set_thread_id(::mach_thread_self()); 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 #else 848 osthread->set_thread_id(::pthread_self()); 849 #endif 850 osthread->set_pthread_id(::pthread_self()); 851 852 // initialize floating point control register 853 os::Bsd::init_thread_fpu_state(); 854 855 // Initial thread state is RUNNABLE 856 osthread->set_state(RUNNABLE); 857 858 thread->set_osthread(osthread); 859 860 // initialize signal mask for this thread 861 // and save the caller's signal mask 862 os::Bsd::hotspot_sigmask(thread); 863 864 return true; 865 } 866 867 void os::pd_start_thread(Thread* thread) { 868 OSThread * osthread = thread->osthread(); 869 assert(osthread->get_state() != INITIALIZED, "just checking"); 870 Monitor* sync_with_child = osthread->startThread_lock(); 871 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 872 sync_with_child->notify(); 873 } 874 875 // Free Bsd resources related to the OSThread 876 void os::free_thread(OSThread* osthread) { 877 assert(osthread != NULL, "osthread not set"); 878 879 if (Thread::current()->osthread() == osthread) { 880 // Restore caller's signal mask 881 sigset_t sigmask = osthread->caller_sigmask(); 882 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 883 } 884 885 delete osthread; 886 } 887 888 ////////////////////////////////////////////////////////////////////////////// 889 // thread local storage 890 891 int os::allocate_thread_local_storage() { 892 pthread_key_t key; 893 int rslt = pthread_key_create(&key, NULL); 894 assert(rslt == 0, "cannot allocate thread local storage"); 895 return (int)key; 896 } 897 898 // Note: This is currently not used by VM, as we don't destroy TLS key 899 // on VM exit. 900 void os::free_thread_local_storage(int index) { 901 int rslt = pthread_key_delete((pthread_key_t)index); 902 assert(rslt == 0, "invalid index"); 903 } 904 905 void os::thread_local_storage_at_put(int index, void* value) { 906 int rslt = pthread_setspecific((pthread_key_t)index, value); 907 assert(rslt == 0, "pthread_setspecific failed"); 908 } 909 910 extern "C" Thread* get_thread() { 911 return ThreadLocalStorage::thread(); 912 } 913 914 915 //////////////////////////////////////////////////////////////////////////////// 916 // time support 917 918 // Time since start-up in seconds to a fine granularity. 919 // Used by VMSelfDestructTimer and the MemProfiler. 920 double os::elapsedTime() { 921 922 return (double)(os::elapsed_counter()) * 0.000001; 923 } 924 925 jlong os::elapsed_counter() { 926 timeval time; 927 int status = gettimeofday(&time, NULL); 928 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 929 } 930 931 jlong os::elapsed_frequency() { 932 return (1000 * 1000); 933 } 934 935 // XXX: For now, code this as if BSD does not support vtime. 936 bool os::supports_vtime() { return false; } 937 bool os::enable_vtime() { return false; } 938 bool os::vtime_enabled() { return false; } 939 double os::elapsedVTime() { 940 // better than nothing, but not much 941 return elapsedTime(); 942 } 943 944 jlong os::javaTimeMillis() { 945 timeval time; 946 int status = gettimeofday(&time, NULL); 947 assert(status != -1, "bsd error"); 948 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 949 } 950 951 #ifndef CLOCK_MONOTONIC 952 #define CLOCK_MONOTONIC (1) 953 #endif 954 955 #ifdef __APPLE__ 956 void os::Bsd::clock_init() { 957 // XXXDARWIN: Investigate replacement monotonic clock 958 } 959 #else 960 void os::Bsd::clock_init() { 961 struct timespec res; 962 struct timespec tp; 963 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 964 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 965 // yes, monotonic clock is supported 966 _clock_gettime = ::clock_gettime; 967 } 968 } 969 #endif 970 971 972 jlong os::javaTimeNanos() { 973 if (Bsd::supports_monotonic_clock()) { 974 struct timespec tp; 975 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 976 assert(status == 0, "gettime error"); 977 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 978 return result; 979 } else { 980 timeval time; 981 int status = gettimeofday(&time, NULL); 982 assert(status != -1, "bsd error"); 983 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 984 return 1000 * usecs; 985 } 986 } 987 988 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 989 if (Bsd::supports_monotonic_clock()) { 990 info_ptr->max_value = ALL_64_BITS; 991 992 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 993 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 994 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 995 } else { 996 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 997 info_ptr->max_value = ALL_64_BITS; 998 999 // gettimeofday is a real time clock so it skips 1000 info_ptr->may_skip_backward = true; 1001 info_ptr->may_skip_forward = true; 1002 } 1003 1004 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1005 } 1006 1007 // Return the real, user, and system times in seconds from an 1008 // arbitrary fixed point in the past. 1009 bool os::getTimesSecs(double* process_real_time, 1010 double* process_user_time, 1011 double* process_system_time) { 1012 struct tms ticks; 1013 clock_t real_ticks = times(&ticks); 1014 1015 if (real_ticks == (clock_t) (-1)) { 1016 return false; 1017 } else { 1018 double ticks_per_second = (double) clock_tics_per_sec; 1019 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1020 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1021 *process_real_time = ((double) real_ticks) / ticks_per_second; 1022 1023 return true; 1024 } 1025 } 1026 1027 1028 char * os::local_time_string(char *buf, size_t buflen) { 1029 struct tm t; 1030 time_t long_time; 1031 time(&long_time); 1032 localtime_r(&long_time, &t); 1033 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1034 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1035 t.tm_hour, t.tm_min, t.tm_sec); 1036 return buf; 1037 } 1038 1039 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1040 return localtime_r(clock, res); 1041 } 1042 1043 //////////////////////////////////////////////////////////////////////////////// 1044 // runtime exit support 1045 1046 // Note: os::shutdown() might be called very early during initialization, or 1047 // called from signal handler. Before adding something to os::shutdown(), make 1048 // sure it is async-safe and can handle partially initialized VM. 1049 void os::shutdown() { 1050 1051 // allow PerfMemory to attempt cleanup of any persistent resources 1052 perfMemory_exit(); 1053 1054 // needs to remove object in file system 1055 AttachListener::abort(); 1056 1057 // flush buffered output, finish log files 1058 ostream_abort(); 1059 1060 // Check for abort hook 1061 abort_hook_t abort_hook = Arguments::abort_hook(); 1062 if (abort_hook != NULL) { 1063 abort_hook(); 1064 } 1065 1066 } 1067 1068 // Note: os::abort() might be called very early during initialization, or 1069 // called from signal handler. Before adding something to os::abort(), make 1070 // sure it is async-safe and can handle partially initialized VM. 1071 void os::abort(bool dump_core) { 1072 os::shutdown(); 1073 if (dump_core) { 1074 #ifndef PRODUCT 1075 fdStream out(defaultStream::output_fd()); 1076 out.print_raw("Current thread is "); 1077 char buf[16]; 1078 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1079 out.print_raw_cr(buf); 1080 out.print_raw_cr("Dumping core ..."); 1081 #endif 1082 ::abort(); // dump core 1083 } 1084 1085 ::exit(1); 1086 } 1087 1088 // Die immediately, no exit hook, no abort hook, no cleanup. 1089 void os::die() { 1090 // _exit() on BsdThreads only kills current thread 1091 ::abort(); 1092 } 1093 1094 // unused on bsd for now. 1095 void os::set_error_file(const char *logfile) {} 1096 1097 1098 // This method is a copy of JDK's sysGetLastErrorString 1099 // from src/solaris/hpi/src/system_md.c 1100 1101 size_t os::lasterror(char *buf, size_t len) { 1102 1103 if (errno == 0) return 0; 1104 1105 const char *s = ::strerror(errno); 1106 size_t n = ::strlen(s); 1107 if (n >= len) { 1108 n = len - 1; 1109 } 1110 ::strncpy(buf, s, n); 1111 buf[n] = '\0'; 1112 return n; 1113 } 1114 1115 intx os::current_thread_id() { 1116 #ifdef __APPLE__ 1117 return (intx)::mach_thread_self(); 1118 #else 1119 return (intx)::pthread_self(); 1120 #endif 1121 } 1122 int os::current_process_id() { 1123 1124 // Under the old bsd thread library, bsd gives each thread 1125 // its own process id. Because of this each thread will return 1126 // a different pid if this method were to return the result 1127 // of getpid(2). Bsd provides no api that returns the pid 1128 // of the launcher thread for the vm. This implementation 1129 // returns a unique pid, the pid of the launcher thread 1130 // that starts the vm 'process'. 1131 1132 // Under the NPTL, getpid() returns the same pid as the 1133 // launcher thread rather than a unique pid per thread. 1134 // Use gettid() if you want the old pre NPTL behaviour. 1135 1136 // if you are looking for the result of a call to getpid() that 1137 // returns a unique pid for the calling thread, then look at the 1138 // OSThread::thread_id() method in osThread_bsd.hpp file 1139 1140 return (int)(_initial_pid ? _initial_pid : getpid()); 1141 } 1142 1143 // DLL functions 1144 1145 #define JNI_LIB_PREFIX "lib" 1146 #ifdef __APPLE__ 1147 #define JNI_LIB_SUFFIX ".dylib" 1148 #else 1149 #define JNI_LIB_SUFFIX ".so" 1150 #endif 1151 1152 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1153 1154 // This must be hard coded because it's the system's temporary 1155 // directory not the java application's temp directory, ala java.io.tmpdir. 1156 #ifdef __APPLE__ 1157 // macosx has a secure per-user temporary directory 1158 char temp_path_storage[PATH_MAX]; 1159 const char* os::get_temp_directory() { 1160 static char *temp_path = NULL; 1161 if (temp_path == NULL) { 1162 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1163 if (pathSize == 0 || pathSize > PATH_MAX) { 1164 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1165 } 1166 temp_path = temp_path_storage; 1167 } 1168 return temp_path; 1169 } 1170 #else /* __APPLE__ */ 1171 const char* os::get_temp_directory() { return "/tmp"; } 1172 #endif /* __APPLE__ */ 1173 1174 static bool file_exists(const char* filename) { 1175 struct stat statbuf; 1176 if (filename == NULL || strlen(filename) == 0) { 1177 return false; 1178 } 1179 return os::stat(filename, &statbuf) == 0; 1180 } 1181 1182 bool os::dll_build_name(char* buffer, size_t buflen, 1183 const char* pname, const char* fname) { 1184 bool retval = false; 1185 // Copied from libhpi 1186 const size_t pnamelen = pname ? strlen(pname) : 0; 1187 1188 // Return error on buffer overflow. 1189 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1190 return retval; 1191 } 1192 1193 if (pnamelen == 0) { 1194 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1195 retval = true; 1196 } else if (strchr(pname, *os::path_separator()) != NULL) { 1197 int n; 1198 char** pelements = split_path(pname, &n); 1199 for (int i = 0 ; i < n ; i++) { 1200 // Really shouldn't be NULL, but check can't hurt 1201 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1202 continue; // skip the empty path values 1203 } 1204 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1205 pelements[i], fname); 1206 if (file_exists(buffer)) { 1207 retval = true; 1208 break; 1209 } 1210 } 1211 // release the storage 1212 for (int i = 0 ; i < n ; i++) { 1213 if (pelements[i] != NULL) { 1214 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1215 } 1216 } 1217 if (pelements != NULL) { 1218 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1219 } 1220 } else { 1221 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1222 retval = true; 1223 } 1224 return retval; 1225 } 1226 1227 const char* os::get_current_directory(char *buf, int buflen) { 1228 return getcwd(buf, buflen); 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 uncommitted pages PROT_READ and PROT_WRITE, change access 2078 // to PROT_EXEC if executable when we commit the page. 2079 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 2080 flags, -1, 0); 2081 2082 if (addr != MAP_FAILED) { 2083 // anon_mmap() should only get called during VM initialization, 2084 // don't need lock (actually we can skip locking even it can be called 2085 // from multiple threads, because _highest_vm_reserved_address is just a 2086 // hint about the upper limit of non-stack memory regions.) 2087 if ((address)addr + bytes > _highest_vm_reserved_address) { 2088 _highest_vm_reserved_address = (address)addr + bytes; 2089 } 2090 } 2091 2092 return addr == MAP_FAILED ? NULL : addr; 2093 } 2094 2095 // Don't update _highest_vm_reserved_address, because there might be memory 2096 // regions above addr + size. If so, releasing a memory region only creates 2097 // a hole in the address space, it doesn't help prevent heap-stack collision. 2098 // 2099 static int anon_munmap(char * addr, size_t size) { 2100 return ::munmap(addr, size) == 0; 2101 } 2102 2103 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2104 size_t alignment_hint) { 2105 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2106 } 2107 2108 bool os::pd_release_memory(char* addr, size_t size) { 2109 return anon_munmap(addr, size); 2110 } 2111 2112 static address highest_vm_reserved_address() { 2113 return _highest_vm_reserved_address; 2114 } 2115 2116 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2117 // Bsd wants the mprotect address argument to be page aligned. 2118 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2119 2120 // According to SUSv3, mprotect() should only be used with mappings 2121 // established by mmap(), and mmap() always maps whole pages. Unaligned 2122 // 'addr' likely indicates problem in the VM (e.g. trying to change 2123 // protection of malloc'ed or statically allocated memory). Check the 2124 // caller if you hit this assert. 2125 assert(addr == bottom, "sanity check"); 2126 2127 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2128 return ::mprotect(bottom, size, prot) == 0; 2129 } 2130 2131 // Set protections specified 2132 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2133 bool is_committed) { 2134 unsigned int p = 0; 2135 switch (prot) { 2136 case MEM_PROT_NONE: p = PROT_NONE; break; 2137 case MEM_PROT_READ: p = PROT_READ; break; 2138 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2139 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2140 default: 2141 ShouldNotReachHere(); 2142 } 2143 // is_committed is unused. 2144 return bsd_mprotect(addr, bytes, p); 2145 } 2146 2147 bool os::guard_memory(char* addr, size_t size) { 2148 return bsd_mprotect(addr, size, PROT_NONE); 2149 } 2150 2151 bool os::unguard_memory(char* addr, size_t size) { 2152 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2153 } 2154 2155 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2156 return false; 2157 } 2158 2159 /* 2160 * Set the coredump_filter bits to include largepages in core dump (bit 6) 2161 * 2162 * From the coredump_filter documentation: 2163 * 2164 * - (bit 0) anonymous private memory 2165 * - (bit 1) anonymous shared memory 2166 * - (bit 2) file-backed private memory 2167 * - (bit 3) file-backed shared memory 2168 * - (bit 4) ELF header pages in file-backed private memory areas (it is 2169 * effective only if the bit 2 is cleared) 2170 * - (bit 5) hugetlb private memory 2171 * - (bit 6) hugetlb shared memory 2172 */ 2173 static void set_coredump_filter(void) { 2174 FILE *f; 2175 long cdm; 2176 2177 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 2178 return; 2179 } 2180 2181 if (fscanf(f, "%lx", &cdm) != 1) { 2182 fclose(f); 2183 return; 2184 } 2185 2186 rewind(f); 2187 2188 if ((cdm & LARGEPAGES_BIT) == 0) { 2189 cdm |= LARGEPAGES_BIT; 2190 fprintf(f, "%#lx", cdm); 2191 } 2192 2193 fclose(f); 2194 } 2195 2196 // Large page support 2197 2198 static size_t _large_page_size = 0; 2199 2200 void os::large_page_init() { 2201 } 2202 2203 2204 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 2205 // "exec" is passed in but not used. Creating the shared image for 2206 // the code cache doesn't have an SHM_X executable permission to check. 2207 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2208 2209 key_t key = IPC_PRIVATE; 2210 char *addr; 2211 2212 bool warn_on_failure = UseLargePages && 2213 (!FLAG_IS_DEFAULT(UseLargePages) || 2214 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2215 ); 2216 char msg[128]; 2217 2218 // Create a large shared memory region to attach to based on size. 2219 // Currently, size is the total size of the heap 2220 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2221 if (shmid == -1) { 2222 // Possible reasons for shmget failure: 2223 // 1. shmmax is too small for Java heap. 2224 // > check shmmax value: cat /proc/sys/kernel/shmmax 2225 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2226 // 2. not enough large page memory. 2227 // > check available large pages: cat /proc/meminfo 2228 // > increase amount of large pages: 2229 // echo new_value > /proc/sys/vm/nr_hugepages 2230 // Note 1: different Bsd may use different name for this property, 2231 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2232 // Note 2: it's possible there's enough physical memory available but 2233 // they are so fragmented after a long run that they can't 2234 // coalesce into large pages. Try to reserve large pages when 2235 // the system is still "fresh". 2236 if (warn_on_failure) { 2237 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2238 warning(msg); 2239 } 2240 return NULL; 2241 } 2242 2243 // attach to the region 2244 addr = (char*)shmat(shmid, req_addr, 0); 2245 int err = errno; 2246 2247 // Remove shmid. If shmat() is successful, the actual shared memory segment 2248 // will be deleted when it's detached by shmdt() or when the process 2249 // terminates. If shmat() is not successful this will remove the shared 2250 // segment immediately. 2251 shmctl(shmid, IPC_RMID, NULL); 2252 2253 if ((intptr_t)addr == -1) { 2254 if (warn_on_failure) { 2255 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2256 warning(msg); 2257 } 2258 return NULL; 2259 } 2260 2261 return addr; 2262 } 2263 2264 bool os::release_memory_special(char* base, size_t bytes) { 2265 // detaching the SHM segment will also delete it, see reserve_memory_special() 2266 int rslt = shmdt(base); 2267 return rslt == 0; 2268 } 2269 2270 size_t os::large_page_size() { 2271 return _large_page_size; 2272 } 2273 2274 // HugeTLBFS allows application to commit large page memory on demand; 2275 // with SysV SHM the entire memory region must be allocated as shared 2276 // memory. 2277 bool os::can_commit_large_page_memory() { 2278 return UseHugeTLBFS; 2279 } 2280 2281 bool os::can_execute_large_page_memory() { 2282 return UseHugeTLBFS; 2283 } 2284 2285 // Reserve memory at an arbitrary address, only if that area is 2286 // available (and not reserved for something else). 2287 2288 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2289 const int max_tries = 10; 2290 char* base[max_tries]; 2291 size_t size[max_tries]; 2292 const size_t gap = 0x000000; 2293 2294 // Assert only that the size is a multiple of the page size, since 2295 // that's all that mmap requires, and since that's all we really know 2296 // about at this low abstraction level. If we need higher alignment, 2297 // we can either pass an alignment to this method or verify alignment 2298 // in one of the methods further up the call chain. See bug 5044738. 2299 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2300 2301 // Repeatedly allocate blocks until the block is allocated at the 2302 // right spot. Give up after max_tries. Note that reserve_memory() will 2303 // automatically update _highest_vm_reserved_address if the call is 2304 // successful. The variable tracks the highest memory address every reserved 2305 // by JVM. It is used to detect heap-stack collision if running with 2306 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2307 // space than needed, it could confuse the collision detecting code. To 2308 // solve the problem, save current _highest_vm_reserved_address and 2309 // calculate the correct value before return. 2310 address old_highest = _highest_vm_reserved_address; 2311 2312 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2313 // if kernel honors the hint then we can return immediately. 2314 char * addr = anon_mmap(requested_addr, bytes, false); 2315 if (addr == requested_addr) { 2316 return requested_addr; 2317 } 2318 2319 if (addr != NULL) { 2320 // mmap() is successful but it fails to reserve at the requested address 2321 anon_munmap(addr, bytes); 2322 } 2323 2324 int i; 2325 for (i = 0; i < max_tries; ++i) { 2326 base[i] = reserve_memory(bytes); 2327 2328 if (base[i] != NULL) { 2329 // Is this the block we wanted? 2330 if (base[i] == requested_addr) { 2331 size[i] = bytes; 2332 break; 2333 } 2334 2335 // Does this overlap the block we wanted? Give back the overlapped 2336 // parts and try again. 2337 2338 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2339 if (top_overlap >= 0 && top_overlap < bytes) { 2340 unmap_memory(base[i], top_overlap); 2341 base[i] += top_overlap; 2342 size[i] = bytes - top_overlap; 2343 } else { 2344 size_t bottom_overlap = base[i] + bytes - requested_addr; 2345 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2346 unmap_memory(requested_addr, bottom_overlap); 2347 size[i] = bytes - bottom_overlap; 2348 } else { 2349 size[i] = bytes; 2350 } 2351 } 2352 } 2353 } 2354 2355 // Give back the unused reserved pieces. 2356 2357 for (int j = 0; j < i; ++j) { 2358 if (base[j] != NULL) { 2359 unmap_memory(base[j], size[j]); 2360 } 2361 } 2362 2363 if (i < max_tries) { 2364 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2365 return requested_addr; 2366 } else { 2367 _highest_vm_reserved_address = old_highest; 2368 return NULL; 2369 } 2370 } 2371 2372 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2373 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2374 } 2375 2376 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2377 // Solaris uses poll(), bsd uses park(). 2378 // Poll() is likely a better choice, assuming that Thread.interrupt() 2379 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2380 // SIGSEGV, see 4355769. 2381 2382 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2383 assert(thread == Thread::current(), "thread consistency check"); 2384 2385 ParkEvent * const slp = thread->_SleepEvent ; 2386 slp->reset() ; 2387 OrderAccess::fence() ; 2388 2389 if (interruptible) { 2390 jlong prevtime = javaTimeNanos(); 2391 2392 for (;;) { 2393 if (os::is_interrupted(thread, true)) { 2394 return OS_INTRPT; 2395 } 2396 2397 jlong newtime = javaTimeNanos(); 2398 2399 if (newtime - prevtime < 0) { 2400 // time moving backwards, should only happen if no monotonic clock 2401 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2402 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2403 } else { 2404 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2405 } 2406 2407 if(millis <= 0) { 2408 return OS_OK; 2409 } 2410 2411 prevtime = newtime; 2412 2413 { 2414 assert(thread->is_Java_thread(), "sanity check"); 2415 JavaThread *jt = (JavaThread *) thread; 2416 ThreadBlockInVM tbivm(jt); 2417 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2418 2419 jt->set_suspend_equivalent(); 2420 // cleared by handle_special_suspend_equivalent_condition() or 2421 // java_suspend_self() via check_and_wait_while_suspended() 2422 2423 slp->park(millis); 2424 2425 // were we externally suspended while we were waiting? 2426 jt->check_and_wait_while_suspended(); 2427 } 2428 } 2429 } else { 2430 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2431 jlong prevtime = javaTimeNanos(); 2432 2433 for (;;) { 2434 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2435 // the 1st iteration ... 2436 jlong newtime = javaTimeNanos(); 2437 2438 if (newtime - prevtime < 0) { 2439 // time moving backwards, should only happen if no monotonic clock 2440 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2441 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2442 } else { 2443 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2444 } 2445 2446 if(millis <= 0) break ; 2447 2448 prevtime = newtime; 2449 slp->park(millis); 2450 } 2451 return OS_OK ; 2452 } 2453 } 2454 2455 int os::naked_sleep() { 2456 // %% make the sleep time an integer flag. for now use 1 millisec. 2457 return os::sleep(Thread::current(), 1, false); 2458 } 2459 2460 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2461 void os::infinite_sleep() { 2462 while (true) { // sleep forever ... 2463 ::sleep(100); // ... 100 seconds at a time 2464 } 2465 } 2466 2467 // Used to convert frequent JVM_Yield() to nops 2468 bool os::dont_yield() { 2469 return DontYieldALot; 2470 } 2471 2472 void os::yield() { 2473 sched_yield(); 2474 } 2475 2476 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2477 2478 void os::yield_all(int attempts) { 2479 // Yields to all threads, including threads with lower priorities 2480 // Threads on Bsd are all with same priority. The Solaris style 2481 // os::yield_all() with nanosleep(1ms) is not necessary. 2482 sched_yield(); 2483 } 2484 2485 // Called from the tight loops to possibly influence time-sharing heuristics 2486 void os::loop_breaker(int attempts) { 2487 os::yield_all(attempts); 2488 } 2489 2490 //////////////////////////////////////////////////////////////////////////////// 2491 // thread priority support 2492 2493 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2494 // only supports dynamic priority, static priority must be zero. For real-time 2495 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2496 // However, for large multi-threaded applications, SCHED_RR is not only slower 2497 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2498 // of 5 runs - Sep 2005). 2499 // 2500 // The following code actually changes the niceness of kernel-thread/LWP. It 2501 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2502 // not the entire user process, and user level threads are 1:1 mapped to kernel 2503 // threads. It has always been the case, but could change in the future. For 2504 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2505 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2506 2507 #if !defined(__APPLE__) 2508 int os::java_to_os_priority[CriticalPriority + 1] = { 2509 19, // 0 Entry should never be used 2510 2511 0, // 1 MinPriority 2512 3, // 2 2513 6, // 3 2514 2515 10, // 4 2516 15, // 5 NormPriority 2517 18, // 6 2518 2519 21, // 7 2520 25, // 8 2521 28, // 9 NearMaxPriority 2522 2523 31, // 10 MaxPriority 2524 2525 31 // 11 CriticalPriority 2526 }; 2527 #else 2528 /* Using Mach high-level priority assignments */ 2529 int os::java_to_os_priority[CriticalPriority + 1] = { 2530 0, // 0 Entry should never be used (MINPRI_USER) 2531 2532 27, // 1 MinPriority 2533 28, // 2 2534 29, // 3 2535 2536 30, // 4 2537 31, // 5 NormPriority (BASEPRI_DEFAULT) 2538 32, // 6 2539 2540 33, // 7 2541 34, // 8 2542 35, // 9 NearMaxPriority 2543 2544 36, // 10 MaxPriority 2545 2546 36 // 11 CriticalPriority 2547 }; 2548 #endif 2549 2550 static int prio_init() { 2551 if (ThreadPriorityPolicy == 1) { 2552 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2553 // if effective uid is not root. Perhaps, a more elegant way of doing 2554 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2555 if (geteuid() != 0) { 2556 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2557 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2558 } 2559 ThreadPriorityPolicy = 0; 2560 } 2561 } 2562 if (UseCriticalJavaThreadPriority) { 2563 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2564 } 2565 return 0; 2566 } 2567 2568 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2569 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2570 2571 #ifdef __OpenBSD__ 2572 // OpenBSD pthread_setprio starves low priority threads 2573 return OS_OK; 2574 #elif defined(__FreeBSD__) 2575 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2576 #elif defined(__APPLE__) || defined(__NetBSD__) 2577 struct sched_param sp; 2578 int policy; 2579 pthread_t self = pthread_self(); 2580 2581 if (pthread_getschedparam(self, &policy, &sp) != 0) 2582 return OS_ERR; 2583 2584 sp.sched_priority = newpri; 2585 if (pthread_setschedparam(self, policy, &sp) != 0) 2586 return OS_ERR; 2587 2588 return OS_OK; 2589 #else 2590 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2591 return (ret == 0) ? OS_OK : OS_ERR; 2592 #endif 2593 } 2594 2595 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2596 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2597 *priority_ptr = java_to_os_priority[NormPriority]; 2598 return OS_OK; 2599 } 2600 2601 errno = 0; 2602 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2603 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2604 #elif defined(__APPLE__) || defined(__NetBSD__) 2605 int policy; 2606 struct sched_param sp; 2607 2608 pthread_getschedparam(pthread_self(), &policy, &sp); 2609 *priority_ptr = sp.sched_priority; 2610 #else 2611 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2612 #endif 2613 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2614 } 2615 2616 // Hint to the underlying OS that a task switch would not be good. 2617 // Void return because it's a hint and can fail. 2618 void os::hint_no_preempt() {} 2619 2620 //////////////////////////////////////////////////////////////////////////////// 2621 // suspend/resume support 2622 2623 // the low-level signal-based suspend/resume support is a remnant from the 2624 // old VM-suspension that used to be for java-suspension, safepoints etc, 2625 // within hotspot. Now there is a single use-case for this: 2626 // - calling get_thread_pc() on the VMThread by the flat-profiler task 2627 // that runs in the watcher thread. 2628 // The remaining code is greatly simplified from the more general suspension 2629 // code that used to be used. 2630 // 2631 // The protocol is quite simple: 2632 // - suspend: 2633 // - sends a signal to the target thread 2634 // - polls the suspend state of the osthread using a yield loop 2635 // - target thread signal handler (SR_handler) sets suspend state 2636 // and blocks in sigsuspend until continued 2637 // - resume: 2638 // - sets target osthread state to continue 2639 // - sends signal to end the sigsuspend loop in the SR_handler 2640 // 2641 // Note that the SR_lock plays no role in this suspend/resume protocol. 2642 // 2643 2644 static void resume_clear_context(OSThread *osthread) { 2645 osthread->set_ucontext(NULL); 2646 osthread->set_siginfo(NULL); 2647 2648 // notify the suspend action is completed, we have now resumed 2649 osthread->sr.clear_suspended(); 2650 } 2651 2652 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2653 osthread->set_ucontext(context); 2654 osthread->set_siginfo(siginfo); 2655 } 2656 2657 // 2658 // Handler function invoked when a thread's execution is suspended or 2659 // resumed. We have to be careful that only async-safe functions are 2660 // called here (Note: most pthread functions are not async safe and 2661 // should be avoided.) 2662 // 2663 // Note: sigwait() is a more natural fit than sigsuspend() from an 2664 // interface point of view, but sigwait() prevents the signal hander 2665 // from being run. libpthread would get very confused by not having 2666 // its signal handlers run and prevents sigwait()'s use with the 2667 // mutex granting granting signal. 2668 // 2669 // Currently only ever called on the VMThread 2670 // 2671 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2672 // Save and restore errno to avoid confusing native code with EINTR 2673 // after sigsuspend. 2674 int old_errno = errno; 2675 2676 Thread* thread = Thread::current(); 2677 OSThread* osthread = thread->osthread(); 2678 assert(thread->is_VM_thread(), "Must be VMThread"); 2679 // read current suspend action 2680 int action = osthread->sr.suspend_action(); 2681 if (action == SR_SUSPEND) { 2682 suspend_save_context(osthread, siginfo, context); 2683 2684 // Notify the suspend action is about to be completed. do_suspend() 2685 // waits until SR_SUSPENDED is set and then returns. We will wait 2686 // here for a resume signal and that completes the suspend-other 2687 // action. do_suspend/do_resume is always called as a pair from 2688 // the same thread - so there are no races 2689 2690 // notify the caller 2691 osthread->sr.set_suspended(); 2692 2693 sigset_t suspend_set; // signals for sigsuspend() 2694 2695 // get current set of blocked signals and unblock resume signal 2696 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2697 sigdelset(&suspend_set, SR_signum); 2698 2699 // wait here until we are resumed 2700 do { 2701 sigsuspend(&suspend_set); 2702 // ignore all returns until we get a resume signal 2703 } while (osthread->sr.suspend_action() != SR_CONTINUE); 2704 2705 resume_clear_context(osthread); 2706 2707 } else { 2708 assert(action == SR_CONTINUE, "unexpected sr action"); 2709 // nothing special to do - just leave the handler 2710 } 2711 2712 errno = old_errno; 2713 } 2714 2715 2716 static int SR_initialize() { 2717 struct sigaction act; 2718 char *s; 2719 /* Get signal number to use for suspend/resume */ 2720 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2721 int sig = ::strtol(s, 0, 10); 2722 if (sig > 0 || sig < NSIG) { 2723 SR_signum = sig; 2724 } 2725 } 2726 2727 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2728 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2729 2730 sigemptyset(&SR_sigset); 2731 sigaddset(&SR_sigset, SR_signum); 2732 2733 /* Set up signal handler for suspend/resume */ 2734 act.sa_flags = SA_RESTART|SA_SIGINFO; 2735 act.sa_handler = (void (*)(int)) SR_handler; 2736 2737 // SR_signum is blocked by default. 2738 // 4528190 - We also need to block pthread restart signal (32 on all 2739 // supported Bsd platforms). Note that BsdThreads need to block 2740 // this signal for all threads to work properly. So we don't have 2741 // to use hard-coded signal number when setting up the mask. 2742 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2743 2744 if (sigaction(SR_signum, &act, 0) == -1) { 2745 return -1; 2746 } 2747 2748 // Save signal flag 2749 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2750 return 0; 2751 } 2752 2753 static int SR_finalize() { 2754 return 0; 2755 } 2756 2757 2758 // returns true on success and false on error - really an error is fatal 2759 // but this seems the normal response to library errors 2760 static bool do_suspend(OSThread* osthread) { 2761 // mark as suspended and send signal 2762 osthread->sr.set_suspend_action(SR_SUSPEND); 2763 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2764 assert_status(status == 0, status, "pthread_kill"); 2765 2766 // check status and wait until notified of suspension 2767 if (status == 0) { 2768 for (int i = 0; !osthread->sr.is_suspended(); i++) { 2769 os::yield_all(i); 2770 } 2771 osthread->sr.set_suspend_action(SR_NONE); 2772 return true; 2773 } 2774 else { 2775 osthread->sr.set_suspend_action(SR_NONE); 2776 return false; 2777 } 2778 } 2779 2780 static void do_resume(OSThread* osthread) { 2781 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2782 osthread->sr.set_suspend_action(SR_CONTINUE); 2783 2784 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2785 assert_status(status == 0, status, "pthread_kill"); 2786 // check status and wait unit notified of resumption 2787 if (status == 0) { 2788 for (int i = 0; osthread->sr.is_suspended(); i++) { 2789 os::yield_all(i); 2790 } 2791 } 2792 osthread->sr.set_suspend_action(SR_NONE); 2793 } 2794 2795 //////////////////////////////////////////////////////////////////////////////// 2796 // interrupt support 2797 2798 void os::interrupt(Thread* thread) { 2799 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2800 "possibility of dangling Thread pointer"); 2801 2802 OSThread* osthread = thread->osthread(); 2803 2804 if (!osthread->interrupted()) { 2805 osthread->set_interrupted(true); 2806 // More than one thread can get here with the same value of osthread, 2807 // resulting in multiple notifications. We do, however, want the store 2808 // to interrupted() to be visible to other threads before we execute unpark(). 2809 OrderAccess::fence(); 2810 ParkEvent * const slp = thread->_SleepEvent ; 2811 if (slp != NULL) slp->unpark() ; 2812 } 2813 2814 // For JSR166. Unpark even if interrupt status already was set 2815 if (thread->is_Java_thread()) 2816 ((JavaThread*)thread)->parker()->unpark(); 2817 2818 ParkEvent * ev = thread->_ParkEvent ; 2819 if (ev != NULL) ev->unpark() ; 2820 2821 } 2822 2823 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2824 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2825 "possibility of dangling Thread pointer"); 2826 2827 OSThread* osthread = thread->osthread(); 2828 2829 bool interrupted = osthread->interrupted(); 2830 2831 if (interrupted && clear_interrupted) { 2832 osthread->set_interrupted(false); 2833 // consider thread->_SleepEvent->reset() ... optional optimization 2834 } 2835 2836 return interrupted; 2837 } 2838 2839 /////////////////////////////////////////////////////////////////////////////////// 2840 // signal handling (except suspend/resume) 2841 2842 // This routine may be used by user applications as a "hook" to catch signals. 2843 // The user-defined signal handler must pass unrecognized signals to this 2844 // routine, and if it returns true (non-zero), then the signal handler must 2845 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2846 // routine will never retun false (zero), but instead will execute a VM panic 2847 // routine kill the process. 2848 // 2849 // If this routine returns false, it is OK to call it again. This allows 2850 // the user-defined signal handler to perform checks either before or after 2851 // the VM performs its own checks. Naturally, the user code would be making 2852 // a serious error if it tried to handle an exception (such as a null check 2853 // or breakpoint) that the VM was generating for its own correct operation. 2854 // 2855 // This routine may recognize any of the following kinds of signals: 2856 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2857 // It should be consulted by handlers for any of those signals. 2858 // 2859 // The caller of this routine must pass in the three arguments supplied 2860 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2861 // field of the structure passed to sigaction(). This routine assumes that 2862 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2863 // 2864 // Note that the VM will print warnings if it detects conflicting signal 2865 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2866 // 2867 extern "C" JNIEXPORT int 2868 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2869 void* ucontext, int abort_if_unrecognized); 2870 2871 void signalHandler(int sig, siginfo_t* info, void* uc) { 2872 assert(info != NULL && uc != NULL, "it must be old kernel"); 2873 JVM_handle_bsd_signal(sig, info, uc, true); 2874 } 2875 2876 2877 // This boolean allows users to forward their own non-matching signals 2878 // to JVM_handle_bsd_signal, harmlessly. 2879 bool os::Bsd::signal_handlers_are_installed = false; 2880 2881 // For signal-chaining 2882 struct sigaction os::Bsd::sigact[MAXSIGNUM]; 2883 unsigned int os::Bsd::sigs = 0; 2884 bool os::Bsd::libjsig_is_loaded = false; 2885 typedef struct sigaction *(*get_signal_t)(int); 2886 get_signal_t os::Bsd::get_signal_action = NULL; 2887 2888 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2889 struct sigaction *actp = NULL; 2890 2891 if (libjsig_is_loaded) { 2892 // Retrieve the old signal handler from libjsig 2893 actp = (*get_signal_action)(sig); 2894 } 2895 if (actp == NULL) { 2896 // Retrieve the preinstalled signal handler from jvm 2897 actp = get_preinstalled_handler(sig); 2898 } 2899 2900 return actp; 2901 } 2902 2903 static bool call_chained_handler(struct sigaction *actp, int sig, 2904 siginfo_t *siginfo, void *context) { 2905 // Call the old signal handler 2906 if (actp->sa_handler == SIG_DFL) { 2907 // It's more reasonable to let jvm treat it as an unexpected exception 2908 // instead of taking the default action. 2909 return false; 2910 } else if (actp->sa_handler != SIG_IGN) { 2911 if ((actp->sa_flags & SA_NODEFER) == 0) { 2912 // automaticlly block the signal 2913 sigaddset(&(actp->sa_mask), sig); 2914 } 2915 2916 sa_handler_t hand; 2917 sa_sigaction_t sa; 2918 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2919 // retrieve the chained handler 2920 if (siginfo_flag_set) { 2921 sa = actp->sa_sigaction; 2922 } else { 2923 hand = actp->sa_handler; 2924 } 2925 2926 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2927 actp->sa_handler = SIG_DFL; 2928 } 2929 2930 // try to honor the signal mask 2931 sigset_t oset; 2932 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2933 2934 // call into the chained handler 2935 if (siginfo_flag_set) { 2936 (*sa)(sig, siginfo, context); 2937 } else { 2938 (*hand)(sig); 2939 } 2940 2941 // restore the signal mask 2942 pthread_sigmask(SIG_SETMASK, &oset, 0); 2943 } 2944 // Tell jvm's signal handler the signal is taken care of. 2945 return true; 2946 } 2947 2948 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2949 bool chained = false; 2950 // signal-chaining 2951 if (UseSignalChaining) { 2952 struct sigaction *actp = get_chained_signal_action(sig); 2953 if (actp != NULL) { 2954 chained = call_chained_handler(actp, sig, siginfo, context); 2955 } 2956 } 2957 return chained; 2958 } 2959 2960 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2961 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 2962 return &sigact[sig]; 2963 } 2964 return NULL; 2965 } 2966 2967 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2968 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2969 sigact[sig] = oldAct; 2970 sigs |= (unsigned int)1 << sig; 2971 } 2972 2973 // for diagnostic 2974 int os::Bsd::sigflags[MAXSIGNUM]; 2975 2976 int os::Bsd::get_our_sigflags(int sig) { 2977 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2978 return sigflags[sig]; 2979 } 2980 2981 void os::Bsd::set_our_sigflags(int sig, int flags) { 2982 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2983 sigflags[sig] = flags; 2984 } 2985 2986 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 2987 // Check for overwrite. 2988 struct sigaction oldAct; 2989 sigaction(sig, (struct sigaction*)NULL, &oldAct); 2990 2991 void* oldhand = oldAct.sa_sigaction 2992 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2993 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2994 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 2995 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 2996 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 2997 if (AllowUserSignalHandlers || !set_installed) { 2998 // Do not overwrite; user takes responsibility to forward to us. 2999 return; 3000 } else if (UseSignalChaining) { 3001 // save the old handler in jvm 3002 save_preinstalled_handler(sig, oldAct); 3003 // libjsig also interposes the sigaction() call below and saves the 3004 // old sigaction on it own. 3005 } else { 3006 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3007 "%#lx for signal %d.", (long)oldhand, sig)); 3008 } 3009 } 3010 3011 struct sigaction sigAct; 3012 sigfillset(&(sigAct.sa_mask)); 3013 sigAct.sa_handler = SIG_DFL; 3014 if (!set_installed) { 3015 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3016 } else { 3017 sigAct.sa_sigaction = signalHandler; 3018 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3019 } 3020 // Save flags, which are set by ours 3021 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3022 sigflags[sig] = sigAct.sa_flags; 3023 3024 int ret = sigaction(sig, &sigAct, &oldAct); 3025 assert(ret == 0, "check"); 3026 3027 void* oldhand2 = oldAct.sa_sigaction 3028 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3029 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3030 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3031 } 3032 3033 // install signal handlers for signals that HotSpot needs to 3034 // handle in order to support Java-level exception handling. 3035 3036 void os::Bsd::install_signal_handlers() { 3037 if (!signal_handlers_are_installed) { 3038 signal_handlers_are_installed = true; 3039 3040 // signal-chaining 3041 typedef void (*signal_setting_t)(); 3042 signal_setting_t begin_signal_setting = NULL; 3043 signal_setting_t end_signal_setting = NULL; 3044 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3045 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3046 if (begin_signal_setting != NULL) { 3047 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3048 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3049 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3050 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3051 libjsig_is_loaded = true; 3052 assert(UseSignalChaining, "should enable signal-chaining"); 3053 } 3054 if (libjsig_is_loaded) { 3055 // Tell libjsig jvm is setting signal handlers 3056 (*begin_signal_setting)(); 3057 } 3058 3059 set_signal_handler(SIGSEGV, true); 3060 set_signal_handler(SIGPIPE, true); 3061 set_signal_handler(SIGBUS, true); 3062 set_signal_handler(SIGILL, true); 3063 set_signal_handler(SIGFPE, true); 3064 set_signal_handler(SIGXFSZ, true); 3065 3066 #if defined(__APPLE__) 3067 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3068 // signals caught and handled by the JVM. To work around this, we reset the mach task 3069 // signal handler that's placed on our process by CrashReporter. This disables 3070 // CrashReporter-based reporting. 3071 // 3072 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3073 // on caught fatal signals. 3074 // 3075 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3076 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3077 // exception handling, while leaving the standard BSD signal handlers functional. 3078 kern_return_t kr; 3079 kr = task_set_exception_ports(mach_task_self(), 3080 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3081 MACH_PORT_NULL, 3082 EXCEPTION_STATE_IDENTITY, 3083 MACHINE_THREAD_STATE); 3084 3085 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3086 #endif 3087 3088 if (libjsig_is_loaded) { 3089 // Tell libjsig jvm finishes setting signal handlers 3090 (*end_signal_setting)(); 3091 } 3092 3093 // We don't activate signal checker if libjsig is in place, we trust ourselves 3094 // and if UserSignalHandler is installed all bets are off 3095 if (CheckJNICalls) { 3096 if (libjsig_is_loaded) { 3097 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3098 check_signals = false; 3099 } 3100 if (AllowUserSignalHandlers) { 3101 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3102 check_signals = false; 3103 } 3104 } 3105 } 3106 } 3107 3108 3109 ///// 3110 // glibc on Bsd platform uses non-documented flag 3111 // to indicate, that some special sort of signal 3112 // trampoline is used. 3113 // We will never set this flag, and we should 3114 // ignore this flag in our diagnostic 3115 #ifdef SIGNIFICANT_SIGNAL_MASK 3116 #undef SIGNIFICANT_SIGNAL_MASK 3117 #endif 3118 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3119 3120 static const char* get_signal_handler_name(address handler, 3121 char* buf, int buflen) { 3122 int offset; 3123 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3124 if (found) { 3125 // skip directory names 3126 const char *p1, *p2; 3127 p1 = buf; 3128 size_t len = strlen(os::file_separator()); 3129 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3130 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3131 } else { 3132 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3133 } 3134 return buf; 3135 } 3136 3137 static void print_signal_handler(outputStream* st, int sig, 3138 char* buf, size_t buflen) { 3139 struct sigaction sa; 3140 3141 sigaction(sig, NULL, &sa); 3142 3143 // See comment for SIGNIFICANT_SIGNAL_MASK define 3144 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3145 3146 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3147 3148 address handler = (sa.sa_flags & SA_SIGINFO) 3149 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3150 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3151 3152 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3153 st->print("SIG_DFL"); 3154 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3155 st->print("SIG_IGN"); 3156 } else { 3157 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3158 } 3159 3160 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3161 3162 address rh = VMError::get_resetted_sighandler(sig); 3163 // May be, handler was resetted by VMError? 3164 if(rh != NULL) { 3165 handler = rh; 3166 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3167 } 3168 3169 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3170 3171 // Check: is it our handler? 3172 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3173 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3174 // It is our signal handler 3175 // check for flags, reset system-used one! 3176 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3177 st->print( 3178 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3179 os::Bsd::get_our_sigflags(sig)); 3180 } 3181 } 3182 st->cr(); 3183 } 3184 3185 3186 #define DO_SIGNAL_CHECK(sig) \ 3187 if (!sigismember(&check_signal_done, sig)) \ 3188 os::Bsd::check_signal_handler(sig) 3189 3190 // This method is a periodic task to check for misbehaving JNI applications 3191 // under CheckJNI, we can add any periodic checks here 3192 3193 void os::run_periodic_checks() { 3194 3195 if (check_signals == false) return; 3196 3197 // SEGV and BUS if overridden could potentially prevent 3198 // generation of hs*.log in the event of a crash, debugging 3199 // such a case can be very challenging, so we absolutely 3200 // check the following for a good measure: 3201 DO_SIGNAL_CHECK(SIGSEGV); 3202 DO_SIGNAL_CHECK(SIGILL); 3203 DO_SIGNAL_CHECK(SIGFPE); 3204 DO_SIGNAL_CHECK(SIGBUS); 3205 DO_SIGNAL_CHECK(SIGPIPE); 3206 DO_SIGNAL_CHECK(SIGXFSZ); 3207 3208 3209 // ReduceSignalUsage allows the user to override these handlers 3210 // see comments at the very top and jvm_solaris.h 3211 if (!ReduceSignalUsage) { 3212 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3213 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3214 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3215 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3216 } 3217 3218 DO_SIGNAL_CHECK(SR_signum); 3219 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3220 } 3221 3222 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3223 3224 static os_sigaction_t os_sigaction = NULL; 3225 3226 void os::Bsd::check_signal_handler(int sig) { 3227 char buf[O_BUFLEN]; 3228 address jvmHandler = NULL; 3229 3230 3231 struct sigaction act; 3232 if (os_sigaction == NULL) { 3233 // only trust the default sigaction, in case it has been interposed 3234 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3235 if (os_sigaction == NULL) return; 3236 } 3237 3238 os_sigaction(sig, (struct sigaction*)NULL, &act); 3239 3240 3241 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3242 3243 address thisHandler = (act.sa_flags & SA_SIGINFO) 3244 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3245 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3246 3247 3248 switch(sig) { 3249 case SIGSEGV: 3250 case SIGBUS: 3251 case SIGFPE: 3252 case SIGPIPE: 3253 case SIGILL: 3254 case SIGXFSZ: 3255 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3256 break; 3257 3258 case SHUTDOWN1_SIGNAL: 3259 case SHUTDOWN2_SIGNAL: 3260 case SHUTDOWN3_SIGNAL: 3261 case BREAK_SIGNAL: 3262 jvmHandler = (address)user_handler(); 3263 break; 3264 3265 case INTERRUPT_SIGNAL: 3266 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3267 break; 3268 3269 default: 3270 if (sig == SR_signum) { 3271 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3272 } else { 3273 return; 3274 } 3275 break; 3276 } 3277 3278 if (thisHandler != jvmHandler) { 3279 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3280 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3281 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3282 // No need to check this sig any longer 3283 sigaddset(&check_signal_done, sig); 3284 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3285 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3286 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3287 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3288 // No need to check this sig any longer 3289 sigaddset(&check_signal_done, sig); 3290 } 3291 3292 // Dump all the signal 3293 if (sigismember(&check_signal_done, sig)) { 3294 print_signal_handlers(tty, buf, O_BUFLEN); 3295 } 3296 } 3297 3298 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3299 3300 extern bool signal_name(int signo, char* buf, size_t len); 3301 3302 const char* os::exception_name(int exception_code, char* buf, size_t size) { 3303 if (0 < exception_code && exception_code <= SIGRTMAX) { 3304 // signal 3305 if (!signal_name(exception_code, buf, size)) { 3306 jio_snprintf(buf, size, "SIG%d", exception_code); 3307 } 3308 return buf; 3309 } else { 3310 return NULL; 3311 } 3312 } 3313 3314 // this is called _before_ the most of global arguments have been parsed 3315 void os::init(void) { 3316 char dummy; /* used to get a guess on initial stack address */ 3317 // first_hrtime = gethrtime(); 3318 3319 // With BsdThreads the JavaMain thread pid (primordial thread) 3320 // is different than the pid of the java launcher thread. 3321 // So, on Bsd, the launcher thread pid is passed to the VM 3322 // via the sun.java.launcher.pid property. 3323 // Use this property instead of getpid() if it was correctly passed. 3324 // See bug 6351349. 3325 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3326 3327 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3328 3329 clock_tics_per_sec = CLK_TCK; 3330 3331 init_random(1234567); 3332 3333 ThreadCritical::initialize(); 3334 3335 Bsd::set_page_size(getpagesize()); 3336 if (Bsd::page_size() == -1) { 3337 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3338 strerror(errno))); 3339 } 3340 init_page_sizes((size_t) Bsd::page_size()); 3341 3342 Bsd::initialize_system_info(); 3343 3344 // main_thread points to the aboriginal thread 3345 Bsd::_main_thread = pthread_self(); 3346 3347 Bsd::clock_init(); 3348 initial_time_count = os::elapsed_counter(); 3349 3350 #ifdef __APPLE__ 3351 // XXXDARWIN 3352 // Work around the unaligned VM callbacks in hotspot's 3353 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3354 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3355 // alignment when doing symbol lookup. To work around this, we force early 3356 // binding of all symbols now, thus binding when alignment is known-good. 3357 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3358 #endif 3359 } 3360 3361 // To install functions for atexit system call 3362 extern "C" { 3363 static void perfMemory_exit_helper() { 3364 perfMemory_exit(); 3365 } 3366 } 3367 3368 // this is called _after_ the global arguments have been parsed 3369 jint os::init_2(void) 3370 { 3371 // Allocate a single page and mark it as readable for safepoint polling 3372 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3373 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3374 3375 os::set_polling_page( polling_page ); 3376 3377 #ifndef PRODUCT 3378 if(Verbose && PrintMiscellaneous) 3379 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3380 #endif 3381 3382 if (!UseMembar) { 3383 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3384 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 3385 os::set_memory_serialize_page( mem_serialize_page ); 3386 3387 #ifndef PRODUCT 3388 if(Verbose && PrintMiscellaneous) 3389 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3390 #endif 3391 } 3392 3393 os::large_page_init(); 3394 3395 // initialize suspend/resume support - must do this before signal_sets_init() 3396 if (SR_initialize() != 0) { 3397 perror("SR_initialize failed"); 3398 return JNI_ERR; 3399 } 3400 3401 Bsd::signal_sets_init(); 3402 Bsd::install_signal_handlers(); 3403 3404 // Check minimum allowable stack size for thread creation and to initialize 3405 // the java system classes, including StackOverflowError - depends on page 3406 // size. Add a page for compiler2 recursion in main thread. 3407 // Add in 2*BytesPerWord times page size to account for VM stack during 3408 // class initialization depending on 32 or 64 bit VM. 3409 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3410 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3411 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3412 3413 size_t threadStackSizeInBytes = ThreadStackSize * K; 3414 if (threadStackSizeInBytes != 0 && 3415 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3416 tty->print_cr("\nThe stack size specified is too small, " 3417 "Specify at least %dk", 3418 os::Bsd::min_stack_allowed/ K); 3419 return JNI_ERR; 3420 } 3421 3422 // Make the stack size a multiple of the page size so that 3423 // the yellow/red zones can be guarded. 3424 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3425 vm_page_size())); 3426 3427 if (MaxFDLimit) { 3428 // set the number of file descriptors to max. print out error 3429 // if getrlimit/setrlimit fails but continue regardless. 3430 struct rlimit nbr_files; 3431 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3432 if (status != 0) { 3433 if (PrintMiscellaneous && (Verbose || WizardMode)) 3434 perror("os::init_2 getrlimit failed"); 3435 } else { 3436 nbr_files.rlim_cur = nbr_files.rlim_max; 3437 3438 #ifdef __APPLE__ 3439 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3440 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3441 // be used instead 3442 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3443 #endif 3444 3445 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3446 if (status != 0) { 3447 if (PrintMiscellaneous && (Verbose || WizardMode)) 3448 perror("os::init_2 setrlimit failed"); 3449 } 3450 } 3451 } 3452 3453 // at-exit methods are called in the reverse order of their registration. 3454 // atexit functions are called on return from main or as a result of a 3455 // call to exit(3C). There can be only 32 of these functions registered 3456 // and atexit() does not set errno. 3457 3458 if (PerfAllowAtExitRegistration) { 3459 // only register atexit functions if PerfAllowAtExitRegistration is set. 3460 // atexit functions can be delayed until process exit time, which 3461 // can be problematic for embedded VM situations. Embedded VMs should 3462 // call DestroyJavaVM() to assure that VM resources are released. 3463 3464 // note: perfMemory_exit_helper atexit function may be removed in 3465 // the future if the appropriate cleanup code can be added to the 3466 // VM_Exit VMOperation's doit method. 3467 if (atexit(perfMemory_exit_helper) != 0) { 3468 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3469 } 3470 } 3471 3472 // initialize thread priority policy 3473 prio_init(); 3474 3475 #ifdef __APPLE__ 3476 // dynamically link to objective c gc registration 3477 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3478 if (handleLibObjc != NULL) { 3479 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3480 } 3481 #endif 3482 3483 return JNI_OK; 3484 } 3485 3486 // this is called at the end of vm_initialization 3487 void os::init_3(void) { } 3488 3489 // Mark the polling page as unreadable 3490 void os::make_polling_page_unreadable(void) { 3491 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3492 fatal("Could not disable polling page"); 3493 }; 3494 3495 // Mark the polling page as readable 3496 void os::make_polling_page_readable(void) { 3497 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3498 fatal("Could not enable polling page"); 3499 } 3500 }; 3501 3502 int os::active_processor_count() { 3503 return _processor_count; 3504 } 3505 3506 void os::set_native_thread_name(const char *name) { 3507 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3508 // This is only supported in Snow Leopard and beyond 3509 if (name != NULL) { 3510 // Add a "Java: " prefix to the name 3511 char buf[MAXTHREADNAMESIZE]; 3512 snprintf(buf, sizeof(buf), "Java: %s", name); 3513 pthread_setname_np(buf); 3514 } 3515 #endif 3516 } 3517 3518 bool os::distribute_processes(uint length, uint* distribution) { 3519 // Not yet implemented. 3520 return false; 3521 } 3522 3523 bool os::bind_to_processor(uint processor_id) { 3524 // Not yet implemented. 3525 return false; 3526 } 3527 3528 /// 3529 3530 // Suspends the target using the signal mechanism and then grabs the PC before 3531 // resuming the target. Used by the flat-profiler only 3532 ExtendedPC os::get_thread_pc(Thread* thread) { 3533 // Make sure that it is called by the watcher for the VMThread 3534 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3535 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3536 3537 ExtendedPC epc; 3538 3539 OSThread* osthread = thread->osthread(); 3540 if (do_suspend(osthread)) { 3541 if (osthread->ucontext() != NULL) { 3542 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 3543 } else { 3544 // NULL context is unexpected, double-check this is the VMThread 3545 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3546 } 3547 do_resume(osthread); 3548 } 3549 // failure means pthread_kill failed for some reason - arguably this is 3550 // a fatal problem, but such problems are ignored elsewhere 3551 3552 return epc; 3553 } 3554 3555 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3556 { 3557 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3558 } 3559 3560 //////////////////////////////////////////////////////////////////////////////// 3561 // debug support 3562 3563 static address same_page(address x, address y) { 3564 int page_bits = -os::vm_page_size(); 3565 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 3566 return x; 3567 else if (x > y) 3568 return (address)(intptr_t(y) | ~page_bits) + 1; 3569 else 3570 return (address)(intptr_t(y) & page_bits); 3571 } 3572 3573 bool os::find(address addr, outputStream* st) { 3574 Dl_info dlinfo; 3575 memset(&dlinfo, 0, sizeof(dlinfo)); 3576 if (dladdr(addr, &dlinfo)) { 3577 st->print(PTR_FORMAT ": ", addr); 3578 if (dlinfo.dli_sname != NULL) { 3579 st->print("%s+%#x", dlinfo.dli_sname, 3580 addr - (intptr_t)dlinfo.dli_saddr); 3581 } else if (dlinfo.dli_fname) { 3582 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3583 } else { 3584 st->print("<absolute address>"); 3585 } 3586 if (dlinfo.dli_fname) { 3587 st->print(" in %s", dlinfo.dli_fname); 3588 } 3589 if (dlinfo.dli_fbase) { 3590 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3591 } 3592 st->cr(); 3593 3594 if (Verbose) { 3595 // decode some bytes around the PC 3596 address begin = same_page(addr-40, addr); 3597 address end = same_page(addr+40, addr); 3598 address lowest = (address) dlinfo.dli_sname; 3599 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3600 if (begin < lowest) begin = lowest; 3601 Dl_info dlinfo2; 3602 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 3603 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3604 end = (address) dlinfo2.dli_saddr; 3605 Disassembler::decode(begin, end, st); 3606 } 3607 return true; 3608 } 3609 return false; 3610 } 3611 3612 //////////////////////////////////////////////////////////////////////////////// 3613 // misc 3614 3615 // This does not do anything on Bsd. This is basically a hook for being 3616 // able to use structured exception handling (thread-local exception filters) 3617 // on, e.g., Win32. 3618 void 3619 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3620 JavaCallArguments* args, Thread* thread) { 3621 f(value, method, args, thread); 3622 } 3623 3624 void os::print_statistics() { 3625 } 3626 3627 int os::message_box(const char* title, const char* message) { 3628 int i; 3629 fdStream err(defaultStream::error_fd()); 3630 for (i = 0; i < 78; i++) err.print_raw("="); 3631 err.cr(); 3632 err.print_raw_cr(title); 3633 for (i = 0; i < 78; i++) err.print_raw("-"); 3634 err.cr(); 3635 err.print_raw_cr(message); 3636 for (i = 0; i < 78; i++) err.print_raw("="); 3637 err.cr(); 3638 3639 char buf[16]; 3640 // Prevent process from exiting upon "read error" without consuming all CPU 3641 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3642 3643 return buf[0] == 'y' || buf[0] == 'Y'; 3644 } 3645 3646 int os::stat(const char *path, struct stat *sbuf) { 3647 char pathbuf[MAX_PATH]; 3648 if (strlen(path) > MAX_PATH - 1) { 3649 errno = ENAMETOOLONG; 3650 return -1; 3651 } 3652 os::native_path(strcpy(pathbuf, path)); 3653 return ::stat(pathbuf, sbuf); 3654 } 3655 3656 bool os::check_heap(bool force) { 3657 return true; 3658 } 3659 3660 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3661 return ::vsnprintf(buf, count, format, args); 3662 } 3663 3664 // Is a (classpath) directory empty? 3665 bool os::dir_is_empty(const char* path) { 3666 DIR *dir = NULL; 3667 struct dirent *ptr; 3668 3669 dir = opendir(path); 3670 if (dir == NULL) return true; 3671 3672 /* Scan the directory */ 3673 bool result = true; 3674 char buf[sizeof(struct dirent) + MAX_PATH]; 3675 while (result && (ptr = ::readdir(dir)) != NULL) { 3676 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3677 result = false; 3678 } 3679 } 3680 closedir(dir); 3681 return result; 3682 } 3683 3684 // This code originates from JDK's sysOpen and open64_w 3685 // from src/solaris/hpi/src/system_md.c 3686 3687 #ifndef O_DELETE 3688 #define O_DELETE 0x10000 3689 #endif 3690 3691 // Open a file. Unlink the file immediately after open returns 3692 // if the specified oflag has the O_DELETE flag set. 3693 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3694 3695 int os::open(const char *path, int oflag, int mode) { 3696 3697 if (strlen(path) > MAX_PATH - 1) { 3698 errno = ENAMETOOLONG; 3699 return -1; 3700 } 3701 int fd; 3702 int o_delete = (oflag & O_DELETE); 3703 oflag = oflag & ~O_DELETE; 3704 3705 fd = ::open(path, oflag, mode); 3706 if (fd == -1) return -1; 3707 3708 //If the open succeeded, the file might still be a directory 3709 { 3710 struct stat buf; 3711 int ret = ::fstat(fd, &buf); 3712 int st_mode = buf.st_mode; 3713 3714 if (ret != -1) { 3715 if ((st_mode & S_IFMT) == S_IFDIR) { 3716 errno = EISDIR; 3717 ::close(fd); 3718 return -1; 3719 } 3720 } else { 3721 ::close(fd); 3722 return -1; 3723 } 3724 } 3725 3726 /* 3727 * All file descriptors that are opened in the JVM and not 3728 * specifically destined for a subprocess should have the 3729 * close-on-exec flag set. If we don't set it, then careless 3rd 3730 * party native code might fork and exec without closing all 3731 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3732 * UNIXProcess.c), and this in turn might: 3733 * 3734 * - cause end-of-file to fail to be detected on some file 3735 * descriptors, resulting in mysterious hangs, or 3736 * 3737 * - might cause an fopen in the subprocess to fail on a system 3738 * suffering from bug 1085341. 3739 * 3740 * (Yes, the default setting of the close-on-exec flag is a Unix 3741 * design flaw) 3742 * 3743 * See: 3744 * 1085341: 32-bit stdio routines should support file descriptors >255 3745 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3746 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3747 */ 3748 #ifdef FD_CLOEXEC 3749 { 3750 int flags = ::fcntl(fd, F_GETFD); 3751 if (flags != -1) 3752 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3753 } 3754 #endif 3755 3756 if (o_delete != 0) { 3757 ::unlink(path); 3758 } 3759 return fd; 3760 } 3761 3762 3763 // create binary file, rewriting existing file if required 3764 int os::create_binary_file(const char* path, bool rewrite_existing) { 3765 int oflags = O_WRONLY | O_CREAT; 3766 if (!rewrite_existing) { 3767 oflags |= O_EXCL; 3768 } 3769 return ::open(path, oflags, S_IREAD | S_IWRITE); 3770 } 3771 3772 // return current position of file pointer 3773 jlong os::current_file_offset(int fd) { 3774 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3775 } 3776 3777 // move file pointer to the specified offset 3778 jlong os::seek_to_file_offset(int fd, jlong offset) { 3779 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3780 } 3781 3782 // This code originates from JDK's sysAvailable 3783 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3784 3785 int os::available(int fd, jlong *bytes) { 3786 jlong cur, end; 3787 int mode; 3788 struct stat buf; 3789 3790 if (::fstat(fd, &buf) >= 0) { 3791 mode = buf.st_mode; 3792 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3793 /* 3794 * XXX: is the following call interruptible? If so, this might 3795 * need to go through the INTERRUPT_IO() wrapper as for other 3796 * blocking, interruptible calls in this file. 3797 */ 3798 int n; 3799 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3800 *bytes = n; 3801 return 1; 3802 } 3803 } 3804 } 3805 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3806 return 0; 3807 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3808 return 0; 3809 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3810 return 0; 3811 } 3812 *bytes = end - cur; 3813 return 1; 3814 } 3815 3816 int os::socket_available(int fd, jint *pbytes) { 3817 if (fd < 0) 3818 return OS_OK; 3819 3820 int ret; 3821 3822 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 3823 3824 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 3825 // is expected to return 0 on failure and 1 on success to the jdk. 3826 3827 return (ret == OS_ERR) ? 0 : 1; 3828 } 3829 3830 // Map a block of memory. 3831 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3832 char *addr, size_t bytes, bool read_only, 3833 bool allow_exec) { 3834 int prot; 3835 int flags; 3836 3837 if (read_only) { 3838 prot = PROT_READ; 3839 flags = MAP_SHARED; 3840 } else { 3841 prot = PROT_READ | PROT_WRITE; 3842 flags = MAP_PRIVATE; 3843 } 3844 3845 if (allow_exec) { 3846 prot |= PROT_EXEC; 3847 } 3848 3849 if (addr != NULL) { 3850 flags |= MAP_FIXED; 3851 } 3852 3853 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3854 fd, file_offset); 3855 if (mapped_address == MAP_FAILED) { 3856 return NULL; 3857 } 3858 return mapped_address; 3859 } 3860 3861 3862 // Remap a block of memory. 3863 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3864 char *addr, size_t bytes, bool read_only, 3865 bool allow_exec) { 3866 // same as map_memory() on this OS 3867 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3868 allow_exec); 3869 } 3870 3871 3872 // Unmap a block of memory. 3873 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3874 return munmap(addr, bytes) == 0; 3875 } 3876 3877 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3878 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3879 // of a thread. 3880 // 3881 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3882 // the fast estimate available on the platform. 3883 3884 jlong os::current_thread_cpu_time() { 3885 #ifdef __APPLE__ 3886 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3887 #endif 3888 } 3889 3890 jlong os::thread_cpu_time(Thread* thread) { 3891 } 3892 3893 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3894 #ifdef __APPLE__ 3895 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3896 #endif 3897 } 3898 3899 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3900 #ifdef __APPLE__ 3901 struct thread_basic_info tinfo; 3902 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3903 kern_return_t kr; 3904 thread_t mach_thread; 3905 3906 mach_thread = thread->osthread()->thread_id(); 3907 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3908 if (kr != KERN_SUCCESS) 3909 return -1; 3910 3911 if (user_sys_cpu_time) { 3912 jlong nanos; 3913 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3914 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3915 return nanos; 3916 } else { 3917 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3918 } 3919 #endif 3920 } 3921 3922 3923 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3924 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3925 info_ptr->may_skip_backward = false; // elapsed time not wall time 3926 info_ptr->may_skip_forward = false; // elapsed time not wall time 3927 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3928 } 3929 3930 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3931 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3932 info_ptr->may_skip_backward = false; // elapsed time not wall time 3933 info_ptr->may_skip_forward = false; // elapsed time not wall time 3934 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3935 } 3936 3937 bool os::is_thread_cpu_time_supported() { 3938 #ifdef __APPLE__ 3939 return true; 3940 #else 3941 return false; 3942 #endif 3943 } 3944 3945 // System loadavg support. Returns -1 if load average cannot be obtained. 3946 // Bsd doesn't yet have a (official) notion of processor sets, 3947 // so just return the system wide load average. 3948 int os::loadavg(double loadavg[], int nelem) { 3949 return ::getloadavg(loadavg, nelem); 3950 } 3951 3952 void os::pause() { 3953 char filename[MAX_PATH]; 3954 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3955 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3956 } else { 3957 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3958 } 3959 3960 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3961 if (fd != -1) { 3962 struct stat buf; 3963 ::close(fd); 3964 while (::stat(filename, &buf) == 0) { 3965 (void)::poll(NULL, 0, 100); 3966 } 3967 } else { 3968 jio_fprintf(stderr, 3969 "Could not open pause file '%s', continuing immediately.\n", filename); 3970 } 3971 } 3972 3973 3974 // Refer to the comments in os_solaris.cpp park-unpark. 3975 // 3976 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 3977 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 3978 // For specifics regarding the bug see GLIBC BUGID 261237 : 3979 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 3980 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 3981 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 3982 // is used. (The simple C test-case provided in the GLIBC bug report manifests the 3983 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 3984 // and monitorenter when we're using 1-0 locking. All those operations may result in 3985 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 3986 // of libpthread avoids the problem, but isn't practical. 3987 // 3988 // Possible remedies: 3989 // 3990 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 3991 // This is palliative and probabilistic, however. If the thread is preempted 3992 // between the call to compute_abstime() and pthread_cond_timedwait(), more 3993 // than the minimum period may have passed, and the abstime may be stale (in the 3994 // past) resultin in a hang. Using this technique reduces the odds of a hang 3995 // but the JVM is still vulnerable, particularly on heavily loaded systems. 3996 // 3997 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 3998 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set 3999 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4000 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4001 // thread. 4002 // 4003 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4004 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4005 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4006 // This also works well. In fact it avoids kernel-level scalability impediments 4007 // on certain platforms that don't handle lots of active pthread_cond_timedwait() 4008 // timers in a graceful fashion. 4009 // 4010 // 4. When the abstime value is in the past it appears that control returns 4011 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4012 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4013 // can avoid the problem by reinitializing the condvar -- by cond_destroy() 4014 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4015 // It may be possible to avoid reinitialization by checking the return 4016 // value from pthread_cond_timedwait(). In addition to reinitializing the 4017 // condvar we must establish the invariant that cond_signal() is only called 4018 // within critical sections protected by the adjunct mutex. This prevents 4019 // cond_signal() from "seeing" a condvar that's in the midst of being 4020 // reinitialized or that is corrupt. Sadly, this invariant obviates the 4021 // desirable signal-after-unlock optimization that avoids futile context switching. 4022 // 4023 // I'm also concerned that some versions of NTPL might allocate an auxilliary 4024 // structure when a condvar is used or initialized. cond_destroy() would 4025 // release the helper structure. Our reinitialize-after-timedwait fix 4026 // put excessive stress on malloc/free and locks protecting the c-heap. 4027 // 4028 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4029 // It may be possible to refine (4) by checking the kernel and NTPL verisons 4030 // and only enabling the work-around for vulnerable environments. 4031 4032 // utility to compute the abstime argument to timedwait: 4033 // millis is the relative timeout time 4034 // abstime will be the absolute timeout time 4035 // TODO: replace compute_abstime() with unpackTime() 4036 4037 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4038 if (millis < 0) millis = 0; 4039 struct timeval now; 4040 int status = gettimeofday(&now, NULL); 4041 assert(status == 0, "gettimeofday"); 4042 jlong seconds = millis / 1000; 4043 millis %= 1000; 4044 if (seconds > 50000000) { // see man cond_timedwait(3T) 4045 seconds = 50000000; 4046 } 4047 abstime->tv_sec = now.tv_sec + seconds; 4048 long usec = now.tv_usec + millis * 1000; 4049 if (usec >= 1000000) { 4050 abstime->tv_sec += 1; 4051 usec -= 1000000; 4052 } 4053 abstime->tv_nsec = usec * 1000; 4054 return abstime; 4055 } 4056 4057 4058 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4059 // Conceptually TryPark() should be equivalent to park(0). 4060 4061 int os::PlatformEvent::TryPark() { 4062 for (;;) { 4063 const int v = _Event ; 4064 guarantee ((v == 0) || (v == 1), "invariant") ; 4065 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4066 } 4067 } 4068 4069 void os::PlatformEvent::park() { // AKA "down()" 4070 // Invariant: Only the thread associated with the Event/PlatformEvent 4071 // may call park(). 4072 // TODO: assert that _Assoc != NULL or _Assoc == Self 4073 int v ; 4074 for (;;) { 4075 v = _Event ; 4076 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4077 } 4078 guarantee (v >= 0, "invariant") ; 4079 if (v == 0) { 4080 // Do this the hard way by blocking ... 4081 int status = pthread_mutex_lock(_mutex); 4082 assert_status(status == 0, status, "mutex_lock"); 4083 guarantee (_nParked == 0, "invariant") ; 4084 ++ _nParked ; 4085 while (_Event < 0) { 4086 status = pthread_cond_wait(_cond, _mutex); 4087 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4088 // Treat this the same as if the wait was interrupted 4089 if (status == ETIMEDOUT) { status = EINTR; } 4090 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4091 } 4092 -- _nParked ; 4093 4094 // In theory we could move the ST of 0 into _Event past the unlock(), 4095 // but then we'd need a MEMBAR after the ST. 4096 _Event = 0 ; 4097 status = pthread_mutex_unlock(_mutex); 4098 assert_status(status == 0, status, "mutex_unlock"); 4099 } 4100 guarantee (_Event >= 0, "invariant") ; 4101 } 4102 4103 int os::PlatformEvent::park(jlong millis) { 4104 guarantee (_nParked == 0, "invariant") ; 4105 4106 int v ; 4107 for (;;) { 4108 v = _Event ; 4109 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4110 } 4111 guarantee (v >= 0, "invariant") ; 4112 if (v != 0) return OS_OK ; 4113 4114 // We do this the hard way, by blocking the thread. 4115 // Consider enforcing a minimum timeout value. 4116 struct timespec abst; 4117 compute_abstime(&abst, millis); 4118 4119 int ret = OS_TIMEOUT; 4120 int status = pthread_mutex_lock(_mutex); 4121 assert_status(status == 0, status, "mutex_lock"); 4122 guarantee (_nParked == 0, "invariant") ; 4123 ++_nParked ; 4124 4125 // Object.wait(timo) will return because of 4126 // (a) notification 4127 // (b) timeout 4128 // (c) thread.interrupt 4129 // 4130 // Thread.interrupt and object.notify{All} both call Event::set. 4131 // That is, we treat thread.interrupt as a special case of notification. 4132 // The underlying Solaris implementation, cond_timedwait, admits 4133 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4134 // JVM from making those visible to Java code. As such, we must 4135 // filter out spurious wakeups. We assume all ETIME returns are valid. 4136 // 4137 // TODO: properly differentiate simultaneous notify+interrupt. 4138 // In that case, we should propagate the notify to another waiter. 4139 4140 while (_Event < 0) { 4141 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4142 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4143 pthread_cond_destroy (_cond); 4144 pthread_cond_init (_cond, NULL) ; 4145 } 4146 assert_status(status == 0 || status == EINTR || 4147 status == ETIMEDOUT, 4148 status, "cond_timedwait"); 4149 if (!FilterSpuriousWakeups) break ; // previous semantics 4150 if (status == ETIMEDOUT) break ; 4151 // We consume and ignore EINTR and spurious wakeups. 4152 } 4153 --_nParked ; 4154 if (_Event >= 0) { 4155 ret = OS_OK; 4156 } 4157 _Event = 0 ; 4158 status = pthread_mutex_unlock(_mutex); 4159 assert_status(status == 0, status, "mutex_unlock"); 4160 assert (_nParked == 0, "invariant") ; 4161 return ret; 4162 } 4163 4164 void os::PlatformEvent::unpark() { 4165 int v, AnyWaiters ; 4166 for (;;) { 4167 v = _Event ; 4168 if (v > 0) { 4169 // The LD of _Event could have reordered or be satisfied 4170 // by a read-aside from this processor's write buffer. 4171 // To avoid problems execute a barrier and then 4172 // ratify the value. 4173 OrderAccess::fence() ; 4174 if (_Event == v) return ; 4175 continue ; 4176 } 4177 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 4178 } 4179 if (v < 0) { 4180 // Wait for the thread associated with the event to vacate 4181 int status = pthread_mutex_lock(_mutex); 4182 assert_status(status == 0, status, "mutex_lock"); 4183 AnyWaiters = _nParked ; 4184 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 4185 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4186 AnyWaiters = 0 ; 4187 pthread_cond_signal (_cond); 4188 } 4189 status = pthread_mutex_unlock(_mutex); 4190 assert_status(status == 0, status, "mutex_unlock"); 4191 if (AnyWaiters != 0) { 4192 status = pthread_cond_signal(_cond); 4193 assert_status(status == 0, status, "cond_signal"); 4194 } 4195 } 4196 4197 // Note that we signal() _after dropping the lock for "immortal" Events. 4198 // This is safe and avoids a common class of futile wakeups. In rare 4199 // circumstances this can cause a thread to return prematurely from 4200 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4201 // simply re-test the condition and re-park itself. 4202 } 4203 4204 4205 // JSR166 4206 // ------------------------------------------------------- 4207 4208 /* 4209 * The solaris and bsd implementations of park/unpark are fairly 4210 * conservative for now, but can be improved. They currently use a 4211 * mutex/condvar pair, plus a a count. 4212 * Park decrements count if > 0, else does a condvar wait. Unpark 4213 * sets count to 1 and signals condvar. Only one thread ever waits 4214 * on the condvar. Contention seen when trying to park implies that someone 4215 * is unparking you, so don't wait. And spurious returns are fine, so there 4216 * is no need to track notifications. 4217 */ 4218 4219 #define MAX_SECS 100000000 4220 /* 4221 * This code is common to bsd and solaris and will be moved to a 4222 * common place in dolphin. 4223 * 4224 * The passed in time value is either a relative time in nanoseconds 4225 * or an absolute time in milliseconds. Either way it has to be unpacked 4226 * into suitable seconds and nanoseconds components and stored in the 4227 * given timespec structure. 4228 * Given time is a 64-bit value and the time_t used in the timespec is only 4229 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4230 * overflow if times way in the future are given. Further on Solaris versions 4231 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4232 * number of seconds, in abstime, is less than current_time + 100,000,000. 4233 * As it will be 28 years before "now + 100000000" will overflow we can 4234 * ignore overflow and just impose a hard-limit on seconds using the value 4235 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4236 * years from "now". 4237 */ 4238 4239 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4240 assert (time > 0, "convertTime"); 4241 4242 struct timeval now; 4243 int status = gettimeofday(&now, NULL); 4244 assert(status == 0, "gettimeofday"); 4245 4246 time_t max_secs = now.tv_sec + MAX_SECS; 4247 4248 if (isAbsolute) { 4249 jlong secs = time / 1000; 4250 if (secs > max_secs) { 4251 absTime->tv_sec = max_secs; 4252 } 4253 else { 4254 absTime->tv_sec = secs; 4255 } 4256 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4257 } 4258 else { 4259 jlong secs = time / NANOSECS_PER_SEC; 4260 if (secs >= MAX_SECS) { 4261 absTime->tv_sec = max_secs; 4262 absTime->tv_nsec = 0; 4263 } 4264 else { 4265 absTime->tv_sec = now.tv_sec + secs; 4266 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4267 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4268 absTime->tv_nsec -= NANOSECS_PER_SEC; 4269 ++absTime->tv_sec; // note: this must be <= max_secs 4270 } 4271 } 4272 } 4273 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4274 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4275 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4276 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4277 } 4278 4279 void Parker::park(bool isAbsolute, jlong time) { 4280 // Optional fast-path check: 4281 // Return immediately if a permit is available. 4282 if (_counter > 0) { 4283 _counter = 0 ; 4284 OrderAccess::fence(); 4285 return ; 4286 } 4287 4288 Thread* thread = Thread::current(); 4289 assert(thread->is_Java_thread(), "Must be JavaThread"); 4290 JavaThread *jt = (JavaThread *)thread; 4291 4292 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4293 // Check interrupt before trying to wait 4294 if (Thread::is_interrupted(thread, false)) { 4295 return; 4296 } 4297 4298 // Next, demultiplex/decode time arguments 4299 struct timespec absTime; 4300 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4301 return; 4302 } 4303 if (time > 0) { 4304 unpackTime(&absTime, isAbsolute, time); 4305 } 4306 4307 4308 // Enter safepoint region 4309 // Beware of deadlocks such as 6317397. 4310 // The per-thread Parker:: mutex is a classic leaf-lock. 4311 // In particular a thread must never block on the Threads_lock while 4312 // holding the Parker:: mutex. If safepoints are pending both the 4313 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4314 ThreadBlockInVM tbivm(jt); 4315 4316 // Don't wait if cannot get lock since interference arises from 4317 // unblocking. Also. check interrupt before trying wait 4318 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4319 return; 4320 } 4321 4322 int status ; 4323 if (_counter > 0) { // no wait needed 4324 _counter = 0; 4325 status = pthread_mutex_unlock(_mutex); 4326 assert (status == 0, "invariant") ; 4327 OrderAccess::fence(); 4328 return; 4329 } 4330 4331 #ifdef ASSERT 4332 // Don't catch signals while blocked; let the running threads have the signals. 4333 // (This allows a debugger to break into the running thread.) 4334 sigset_t oldsigs; 4335 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4336 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4337 #endif 4338 4339 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4340 jt->set_suspend_equivalent(); 4341 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4342 4343 if (time == 0) { 4344 status = pthread_cond_wait (_cond, _mutex) ; 4345 } else { 4346 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4347 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4348 pthread_cond_destroy (_cond) ; 4349 pthread_cond_init (_cond, NULL); 4350 } 4351 } 4352 assert_status(status == 0 || status == EINTR || 4353 status == ETIMEDOUT, 4354 status, "cond_timedwait"); 4355 4356 #ifdef ASSERT 4357 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4358 #endif 4359 4360 _counter = 0 ; 4361 status = pthread_mutex_unlock(_mutex) ; 4362 assert_status(status == 0, status, "invariant") ; 4363 // If externally suspended while waiting, re-suspend 4364 if (jt->handle_special_suspend_equivalent_condition()) { 4365 jt->java_suspend_self(); 4366 } 4367 4368 OrderAccess::fence(); 4369 } 4370 4371 void Parker::unpark() { 4372 int s, status ; 4373 status = pthread_mutex_lock(_mutex); 4374 assert (status == 0, "invariant") ; 4375 s = _counter; 4376 _counter = 1; 4377 if (s < 1) { 4378 if (WorkAroundNPTLTimedWaitHang) { 4379 status = pthread_cond_signal (_cond) ; 4380 assert (status == 0, "invariant") ; 4381 status = pthread_mutex_unlock(_mutex); 4382 assert (status == 0, "invariant") ; 4383 } else { 4384 status = pthread_mutex_unlock(_mutex); 4385 assert (status == 0, "invariant") ; 4386 status = pthread_cond_signal (_cond) ; 4387 assert (status == 0, "invariant") ; 4388 } 4389 } else { 4390 pthread_mutex_unlock(_mutex); 4391 assert (status == 0, "invariant") ; 4392 } 4393 } 4394 4395 4396 /* Darwin has no "environ" in a dynamic library. */ 4397 #ifdef __APPLE__ 4398 #include <crt_externs.h> 4399 #define environ (*_NSGetEnviron()) 4400 #else 4401 extern char** environ; 4402 #endif 4403 4404 // Run the specified command in a separate process. Return its exit value, 4405 // or -1 on failure (e.g. can't fork a new process). 4406 // Unlike system(), this function can be called from signal handler. It 4407 // doesn't block SIGINT et al. 4408 int os::fork_and_exec(char* cmd) { 4409 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4410 4411 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4412 // pthread_atfork handlers and reset pthread library. All we need is a 4413 // separate process to execve. Make a direct syscall to fork process. 4414 // On IA64 there's no fork syscall, we have to use fork() and hope for 4415 // the best... 4416 pid_t pid = fork(); 4417 4418 if (pid < 0) { 4419 // fork failed 4420 return -1; 4421 4422 } else if (pid == 0) { 4423 // child process 4424 4425 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4426 // first to kill every thread on the thread list. Because this list is 4427 // not reset by fork() (see notes above), execve() will instead kill 4428 // every thread in the parent process. We know this is the only thread 4429 // in the new process, so make a system call directly. 4430 // IA64 should use normal execve() from glibc to match the glibc fork() 4431 // above. 4432 execve("/bin/sh", (char* const*)argv, environ); 4433 4434 // execve failed 4435 _exit(-1); 4436 4437 } else { 4438 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4439 // care about the actual exit code, for now. 4440 4441 int status; 4442 4443 // Wait for the child process to exit. This returns immediately if 4444 // the child has already exited. */ 4445 while (waitpid(pid, &status, 0) < 0) { 4446 switch (errno) { 4447 case ECHILD: return 0; 4448 case EINTR: break; 4449 default: return -1; 4450 } 4451 } 4452 4453 if (WIFEXITED(status)) { 4454 // The child exited normally; get its exit code. 4455 return WEXITSTATUS(status); 4456 } else if (WIFSIGNALED(status)) { 4457 // The child exited because of a signal 4458 // The best value to return is 0x80 + signal number, 4459 // because that is what all Unix shells do, and because 4460 // it allows callers to distinguish between process exit and 4461 // process death by signal. 4462 return 0x80 + WTERMSIG(status); 4463 } else { 4464 // Unknown exit code; pass it through 4465 return status; 4466 } 4467 } 4468 } 4469 4470 // is_headless_jre() 4471 // 4472 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4473 // in order to report if we are running in a headless jre 4474 // 4475 // Since JDK8 xawt/libmawt.so was moved into the same directory 4476 // as libawt.so, and renamed libawt_xawt.so 4477 // 4478 bool os::is_headless_jre() { 4479 struct stat statbuf; 4480 char buf[MAXPATHLEN]; 4481 char libmawtpath[MAXPATHLEN]; 4482 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4483 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4484 char *p; 4485 4486 // Get path to libjvm.so 4487 os::jvm_path(buf, sizeof(buf)); 4488 4489 // Get rid of libjvm.so 4490 p = strrchr(buf, '/'); 4491 if (p == NULL) return false; 4492 else *p = '\0'; 4493 4494 // Get rid of client or server 4495 p = strrchr(buf, '/'); 4496 if (p == NULL) return false; 4497 else *p = '\0'; 4498 4499 // check xawt/libmawt.so 4500 strcpy(libmawtpath, buf); 4501 strcat(libmawtpath, xawtstr); 4502 if (::stat(libmawtpath, &statbuf) == 0) return false; 4503 4504 // check libawt_xawt.so 4505 strcpy(libmawtpath, buf); 4506 strcat(libmawtpath, new_xawtstr); 4507 if (::stat(libmawtpath, &statbuf) == 0) return false; 4508 4509 return true; 4510 } 4511 4512 // Get the default path to the core file 4513 // Returns the length of the string 4514 int os::get_core_path(char* buffer, size_t bufferSize) { 4515 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4516 4517 // Truncate if theoretical string was longer than bufferSize 4518 n = MIN2(n, (int)bufferSize); 4519 4520 return n; 4521 }