1 /* 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_bsd.h" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/filemap.hpp" 37 #include "mutex_bsd.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_bsd.hpp" 40 #include "prims/jniFastGetField.hpp" 41 #include "prims/jvm.h" 42 #include "prims/jvm_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/extendedPC.hpp" 45 #include "runtime/globals.hpp" 46 #include "runtime/interfaceSupport.hpp" 47 #include "runtime/java.hpp" 48 #include "runtime/javaCalls.hpp" 49 #include "runtime/mutexLocker.hpp" 50 #include "runtime/objectMonitor.hpp" 51 #include "runtime/osThread.hpp" 52 #include "runtime/perfMemory.hpp" 53 #include "runtime/sharedRuntime.hpp" 54 #include "runtime/statSampler.hpp" 55 #include "runtime/stubRoutines.hpp" 56 #include "runtime/thread.inline.hpp" 57 #include "runtime/threadCritical.hpp" 58 #include "runtime/timer.hpp" 59 #include "services/attachListener.hpp" 60 #include "services/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 julong 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 assert(len == sizeof(cpu_val), "unexpected data size"); 254 set_processor_count(cpu_val); 255 } 256 else { 257 set_processor_count(1); // fallback 258 } 259 260 /* get physical memory via hw.memsize sysctl (hw.memsize is used 261 * since it returns a 64 bit value) 262 */ 263 mib[0] = CTL_HW; 264 mib[1] = HW_MEMSIZE; 265 len = sizeof(mem_val); 266 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 267 assert(len == sizeof(mem_val), "unexpected data size"); 268 _physical_memory = mem_val; 269 } else { 270 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 271 } 272 273 #ifdef __OpenBSD__ 274 { 275 // limit _physical_memory memory view on OpenBSD since 276 // datasize rlimit restricts us anyway. 277 struct rlimit limits; 278 getrlimit(RLIMIT_DATA, &limits); 279 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 280 } 281 #endif 282 } 283 284 #ifdef __APPLE__ 285 static const char *get_home() { 286 const char *home_dir = ::getenv("HOME"); 287 if ((home_dir == NULL) || (*home_dir == '\0')) { 288 struct passwd *passwd_info = getpwuid(geteuid()); 289 if (passwd_info != NULL) { 290 home_dir = passwd_info->pw_dir; 291 } 292 } 293 294 return home_dir; 295 } 296 #endif 297 298 void os::init_system_properties_values() { 299 // char arch[12]; 300 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 301 302 // The next steps are taken in the product version: 303 // 304 // Obtain the JAVA_HOME value from the location of libjvm.so. 305 // This library should be located at: 306 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 307 // 308 // If "/jre/lib/" appears at the right place in the path, then we 309 // assume libjvm.so is installed in a JDK and we use this path. 310 // 311 // Otherwise exit with message: "Could not create the Java virtual machine." 312 // 313 // The following extra steps are taken in the debugging version: 314 // 315 // If "/jre/lib/" does NOT appear at the right place in the path 316 // instead of exit check for $JAVA_HOME environment variable. 317 // 318 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 319 // then we append a fake suffix "hotspot/libjvm.so" to this path so 320 // it looks like libjvm.so is installed there 321 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 322 // 323 // Otherwise exit. 324 // 325 // Important note: if the location of libjvm.so changes this 326 // code needs to be changed accordingly. 327 328 // The next few definitions allow the code to be verbatim: 329 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 330 #define getenv(n) ::getenv(n) 331 332 /* 333 * See ld(1): 334 * The linker uses the following search paths to locate required 335 * shared libraries: 336 * 1: ... 337 * ... 338 * 7: The default directories, normally /lib and /usr/lib. 339 */ 340 #ifndef DEFAULT_LIBPATH 341 #define DEFAULT_LIBPATH "/lib:/usr/lib" 342 #endif 343 344 #define EXTENSIONS_DIR "/lib/ext" 345 #define ENDORSED_DIR "/lib/endorsed" 346 #define REG_DIR "/usr/java/packages" 347 348 #ifdef __APPLE__ 349 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 350 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 351 const char *user_home_dir = get_home(); 352 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 353 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 354 sizeof(SYS_EXTENSIONS_DIRS); 355 #endif 356 357 { 358 /* sysclasspath, java_home, dll_dir */ 359 { 360 char *home_path; 361 char *dll_path; 362 char *pslash; 363 char buf[MAXPATHLEN]; 364 os::jvm_path(buf, sizeof(buf)); 365 366 // Found the full path to libjvm.so. 367 // Now cut the path to <java_home>/jre if we can. 368 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 369 pslash = strrchr(buf, '/'); 370 if (pslash != NULL) 371 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 372 dll_path = malloc(strlen(buf) + 1); 373 if (dll_path == NULL) 374 return; 375 strcpy(dll_path, buf); 376 Arguments::set_dll_dir(dll_path); 377 378 if (pslash != NULL) { 379 pslash = strrchr(buf, '/'); 380 if (pslash != NULL) { 381 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 382 #ifndef __APPLE__ 383 pslash = strrchr(buf, '/'); 384 if (pslash != NULL) 385 *pslash = '\0'; /* get rid of /lib */ 386 #endif 387 } 388 } 389 390 home_path = malloc(strlen(buf) + 1); 391 if (home_path == NULL) 392 return; 393 strcpy(home_path, buf); 394 Arguments::set_java_home(home_path); 395 396 if (!set_boot_path('/', ':')) 397 return; 398 } 399 400 /* 401 * Where to look for native libraries 402 * 403 * Note: Due to a legacy implementation, most of the library path 404 * is set in the launcher. This was to accomodate linking restrictions 405 * on legacy Bsd implementations (which are no longer supported). 406 * Eventually, all the library path setting will be done here. 407 * 408 * However, to prevent the proliferation of improperly built native 409 * libraries, the new path component /usr/java/packages is added here. 410 * Eventually, all the library path setting will be done here. 411 */ 412 { 413 char *ld_library_path; 414 415 /* 416 * Construct the invariant part of ld_library_path. Note that the 417 * space for the colon and the trailing null are provided by the 418 * nulls included by the sizeof operator (so actually we allocate 419 * a byte more than necessary). 420 */ 421 #ifdef __APPLE__ 422 ld_library_path = (char *) malloc(system_ext_size); 423 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 424 #else 425 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 426 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 427 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 428 #endif 429 430 /* 431 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 432 * should always exist (until the legacy problem cited above is 433 * addressed). 434 */ 435 #ifdef __APPLE__ 436 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 437 char *l = getenv("JAVA_LIBRARY_PATH"); 438 if (l != NULL) { 439 char *t = ld_library_path; 440 /* That's +1 for the colon and +1 for the trailing '\0' */ 441 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 442 sprintf(ld_library_path, "%s:%s", l, t); 443 free(t); 444 } 445 446 char *v = getenv("DYLD_LIBRARY_PATH"); 447 #else 448 char *v = getenv("LD_LIBRARY_PATH"); 449 #endif 450 if (v != NULL) { 451 char *t = ld_library_path; 452 /* That's +1 for the colon and +1 for the trailing '\0' */ 453 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 454 sprintf(ld_library_path, "%s:%s", v, t); 455 free(t); 456 } 457 458 #ifdef __APPLE__ 459 // Apple's Java6 has "." at the beginning of java.library.path. 460 // OpenJDK on Windows has "." at the end of java.library.path. 461 // OpenJDK on Linux and Solaris don't have "." in java.library.path 462 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 463 // "." is appended to the end of java.library.path. Yes, this 464 // could cause a change in behavior, but Apple's Java6 behavior 465 // can be achieved by putting "." at the beginning of the 466 // JAVA_LIBRARY_PATH environment variable. 467 { 468 char *t = ld_library_path; 469 // that's +3 for appending ":." and the trailing '\0' 470 ld_library_path = (char *) malloc(strlen(t) + 3); 471 sprintf(ld_library_path, "%s:%s", t, "."); 472 free(t); 473 } 474 #endif 475 476 Arguments::set_library_path(ld_library_path); 477 } 478 479 /* 480 * Extensions directories. 481 * 482 * Note that the space for the colon and the trailing null are provided 483 * by the nulls included by the sizeof operator (so actually one byte more 484 * than necessary is allocated). 485 */ 486 { 487 #ifdef __APPLE__ 488 char *buf = malloc(strlen(Arguments::get_java_home()) + 489 sizeof(EXTENSIONS_DIR) + system_ext_size); 490 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 491 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 492 #else 493 char *buf = malloc(strlen(Arguments::get_java_home()) + 494 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 495 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 496 Arguments::get_java_home()); 497 #endif 498 499 Arguments::set_ext_dirs(buf); 500 } 501 502 /* Endorsed standards default directory. */ 503 { 504 char * buf; 505 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 506 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 507 Arguments::set_endorsed_dirs(buf); 508 } 509 } 510 511 #ifdef __APPLE__ 512 #undef SYS_EXTENSIONS_DIR 513 #endif 514 #undef malloc 515 #undef getenv 516 #undef EXTENSIONS_DIR 517 #undef ENDORSED_DIR 518 519 // Done 520 return; 521 } 522 523 //////////////////////////////////////////////////////////////////////////////// 524 // breakpoint support 525 526 void os::breakpoint() { 527 BREAKPOINT; 528 } 529 530 extern "C" void breakpoint() { 531 // use debugger to set breakpoint here 532 } 533 534 //////////////////////////////////////////////////////////////////////////////// 535 // signal support 536 537 debug_only(static bool signal_sets_initialized = false); 538 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 539 540 bool os::Bsd::is_sig_ignored(int sig) { 541 struct sigaction oact; 542 sigaction(sig, (struct sigaction*)NULL, &oact); 543 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 544 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 545 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 546 return true; 547 else 548 return false; 549 } 550 551 void os::Bsd::signal_sets_init() { 552 // Should also have an assertion stating we are still single-threaded. 553 assert(!signal_sets_initialized, "Already initialized"); 554 // Fill in signals that are necessarily unblocked for all threads in 555 // the VM. Currently, we unblock the following signals: 556 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 557 // by -Xrs (=ReduceSignalUsage)); 558 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 559 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 560 // the dispositions or masks wrt these signals. 561 // Programs embedding the VM that want to use the above signals for their 562 // own purposes must, at this time, use the "-Xrs" option to prevent 563 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 564 // (See bug 4345157, and other related bugs). 565 // In reality, though, unblocking these signals is really a nop, since 566 // these signals are not blocked by default. 567 sigemptyset(&unblocked_sigs); 568 sigemptyset(&allowdebug_blocked_sigs); 569 sigaddset(&unblocked_sigs, SIGILL); 570 sigaddset(&unblocked_sigs, SIGSEGV); 571 sigaddset(&unblocked_sigs, SIGBUS); 572 sigaddset(&unblocked_sigs, SIGFPE); 573 sigaddset(&unblocked_sigs, SR_signum); 574 575 if (!ReduceSignalUsage) { 576 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 577 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 578 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 579 } 580 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 581 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 582 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 583 } 584 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 585 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 586 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 587 } 588 } 589 // Fill in signals that are blocked by all but the VM thread. 590 sigemptyset(&vm_sigs); 591 if (!ReduceSignalUsage) 592 sigaddset(&vm_sigs, BREAK_SIGNAL); 593 debug_only(signal_sets_initialized = true); 594 595 } 596 597 // These are signals that are unblocked while a thread is running Java. 598 // (For some reason, they get blocked by default.) 599 sigset_t* os::Bsd::unblocked_signals() { 600 assert(signal_sets_initialized, "Not initialized"); 601 return &unblocked_sigs; 602 } 603 604 // These are the signals that are blocked while a (non-VM) thread is 605 // running Java. Only the VM thread handles these signals. 606 sigset_t* os::Bsd::vm_signals() { 607 assert(signal_sets_initialized, "Not initialized"); 608 return &vm_sigs; 609 } 610 611 // These are signals that are blocked during cond_wait to allow debugger in 612 sigset_t* os::Bsd::allowdebug_blocked_signals() { 613 assert(signal_sets_initialized, "Not initialized"); 614 return &allowdebug_blocked_sigs; 615 } 616 617 void os::Bsd::hotspot_sigmask(Thread* thread) { 618 619 //Save caller's signal mask before setting VM signal mask 620 sigset_t caller_sigmask; 621 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 622 623 OSThread* osthread = thread->osthread(); 624 osthread->set_caller_sigmask(caller_sigmask); 625 626 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 627 628 if (!ReduceSignalUsage) { 629 if (thread->is_VM_thread()) { 630 // Only the VM thread handles BREAK_SIGNAL ... 631 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 632 } else { 633 // ... all other threads block BREAK_SIGNAL 634 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 635 } 636 } 637 } 638 639 640 ////////////////////////////////////////////////////////////////////////////// 641 // create new thread 642 643 static address highest_vm_reserved_address(); 644 645 // check if it's safe to start a new thread 646 static bool _thread_safety_check(Thread* thread) { 647 return true; 648 } 649 650 #ifdef __APPLE__ 651 // library handle for calling objc_registerThreadWithCollector() 652 // without static linking to the libobjc library 653 #define OBJC_LIB "/usr/lib/libobjc.dylib" 654 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 655 typedef void (*objc_registerThreadWithCollector_t)(); 656 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 657 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 658 #endif 659 660 #ifdef __APPLE__ 661 static uint64_t locate_unique_thread_id() { 662 // Additional thread_id used to correlate threads in SA 663 thread_identifier_info_data_t m_ident_info; 664 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 665 666 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, 667 (thread_info_t) &m_ident_info, &count); 668 return m_ident_info.thread_id; 669 } 670 #endif 671 672 // Thread start routine for all newly created threads 673 static void *java_start(Thread *thread) { 674 // Try to randomize the cache line index of hot stack frames. 675 // This helps when threads of the same stack traces evict each other's 676 // cache lines. The threads can be either from the same JVM instance, or 677 // from different JVM instances. The benefit is especially true for 678 // processors with hyperthreading technology. 679 static int counter = 0; 680 int pid = os::current_process_id(); 681 alloca(((pid ^ counter++) & 7) * 128); 682 683 ThreadLocalStorage::set_thread(thread); 684 685 OSThread* osthread = thread->osthread(); 686 Monitor* sync = osthread->startThread_lock(); 687 688 // non floating stack BsdThreads needs extra check, see above 689 if (!_thread_safety_check(thread)) { 690 // notify parent thread 691 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 692 osthread->set_state(ZOMBIE); 693 sync->notify_all(); 694 return NULL; 695 } 696 697 #ifdef __APPLE__ 698 // thread_id is mach thread on macos 699 osthread->set_thread_id(::mach_thread_self()); 700 osthread->set_unique_thread_id(locate_unique_thread_id()); 701 #else 702 // thread_id is pthread_id on BSD 703 osthread->set_thread_id(::pthread_self()); 704 #endif 705 // initialize signal mask for this thread 706 os::Bsd::hotspot_sigmask(thread); 707 708 // initialize floating point control register 709 os::Bsd::init_thread_fpu_state(); 710 711 #ifdef __APPLE__ 712 // register thread with objc gc 713 if (objc_registerThreadWithCollectorFunction != NULL) { 714 objc_registerThreadWithCollectorFunction(); 715 } 716 #endif 717 718 // handshaking with parent thread 719 { 720 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 721 722 // notify parent thread 723 osthread->set_state(INITIALIZED); 724 sync->notify_all(); 725 726 // wait until os::start_thread() 727 while (osthread->get_state() == INITIALIZED) { 728 sync->wait(Mutex::_no_safepoint_check_flag); 729 } 730 } 731 732 // call one more level start routine 733 thread->run(); 734 735 return 0; 736 } 737 738 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 739 assert(thread->osthread() == NULL, "caller responsible"); 740 741 // Allocate the OSThread object 742 OSThread* osthread = new OSThread(NULL, NULL); 743 if (osthread == NULL) { 744 return false; 745 } 746 747 // set the correct thread state 748 osthread->set_thread_type(thr_type); 749 750 // Initial state is ALLOCATED but not INITIALIZED 751 osthread->set_state(ALLOCATED); 752 753 thread->set_osthread(osthread); 754 755 // init thread attributes 756 pthread_attr_t attr; 757 pthread_attr_init(&attr); 758 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 759 760 // stack size 761 if (os::Bsd::supports_variable_stack_size()) { 762 // calculate stack size if it's not specified by caller 763 if (stack_size == 0) { 764 stack_size = os::Bsd::default_stack_size(thr_type); 765 766 switch (thr_type) { 767 case os::java_thread: 768 // Java threads use ThreadStackSize which default value can be 769 // changed with the flag -Xss 770 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 771 stack_size = JavaThread::stack_size_at_create(); 772 break; 773 case os::compiler_thread: 774 if (CompilerThreadStackSize > 0) { 775 stack_size = (size_t)(CompilerThreadStackSize * K); 776 break; 777 } // else fall through: 778 // use VMThreadStackSize if CompilerThreadStackSize is not defined 779 case os::vm_thread: 780 case os::pgc_thread: 781 case os::cgc_thread: 782 case os::watcher_thread: 783 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 784 break; 785 } 786 } 787 788 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 789 pthread_attr_setstacksize(&attr, stack_size); 790 } else { 791 // let pthread_create() pick the default value. 792 } 793 794 ThreadState state; 795 796 { 797 pthread_t tid; 798 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 799 800 pthread_attr_destroy(&attr); 801 802 if (ret != 0) { 803 if (PrintMiscellaneous && (Verbose || WizardMode)) { 804 perror("pthread_create()"); 805 } 806 // Need to clean up stuff we've allocated so far 807 thread->set_osthread(NULL); 808 delete osthread; 809 return false; 810 } 811 812 // Store pthread info into the OSThread 813 osthread->set_pthread_id(tid); 814 815 // Wait until child thread is either initialized or aborted 816 { 817 Monitor* sync_with_child = osthread->startThread_lock(); 818 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 819 while ((state = osthread->get_state()) == ALLOCATED) { 820 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 821 } 822 } 823 824 } 825 826 // Aborted due to thread limit being reached 827 if (state == ZOMBIE) { 828 thread->set_osthread(NULL); 829 delete osthread; 830 return false; 831 } 832 833 // The thread is returned suspended (in state INITIALIZED), 834 // and is started higher up in the call chain 835 assert(state == INITIALIZED, "race condition"); 836 return true; 837 } 838 839 ///////////////////////////////////////////////////////////////////////////// 840 // attach existing thread 841 842 // bootstrap the main thread 843 bool os::create_main_thread(JavaThread* thread) { 844 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 845 return create_attached_thread(thread); 846 } 847 848 bool os::create_attached_thread(JavaThread* thread) { 849 #ifdef ASSERT 850 thread->verify_not_published(); 851 #endif 852 853 // Allocate the OSThread object 854 OSThread* osthread = new OSThread(NULL, NULL); 855 856 if (osthread == NULL) { 857 return false; 858 } 859 860 // Store pthread info into the OSThread 861 #ifdef __APPLE__ 862 osthread->set_thread_id(::mach_thread_self()); 863 osthread->set_unique_thread_id(locate_unique_thread_id()); 864 #else 865 osthread->set_thread_id(::pthread_self()); 866 #endif 867 osthread->set_pthread_id(::pthread_self()); 868 869 // initialize floating point control register 870 os::Bsd::init_thread_fpu_state(); 871 872 // Initial thread state is RUNNABLE 873 osthread->set_state(RUNNABLE); 874 875 thread->set_osthread(osthread); 876 877 // initialize signal mask for this thread 878 // and save the caller's signal mask 879 os::Bsd::hotspot_sigmask(thread); 880 881 return true; 882 } 883 884 void os::pd_start_thread(Thread* thread) { 885 OSThread * osthread = thread->osthread(); 886 assert(osthread->get_state() != INITIALIZED, "just checking"); 887 Monitor* sync_with_child = osthread->startThread_lock(); 888 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 889 sync_with_child->notify(); 890 } 891 892 // Free Bsd resources related to the OSThread 893 void os::free_thread(OSThread* osthread) { 894 assert(osthread != NULL, "osthread not set"); 895 896 if (Thread::current()->osthread() == osthread) { 897 // Restore caller's signal mask 898 sigset_t sigmask = osthread->caller_sigmask(); 899 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 900 } 901 902 delete osthread; 903 } 904 905 ////////////////////////////////////////////////////////////////////////////// 906 // thread local storage 907 908 int os::allocate_thread_local_storage() { 909 pthread_key_t key; 910 int rslt = pthread_key_create(&key, NULL); 911 assert(rslt == 0, "cannot allocate thread local storage"); 912 return (int)key; 913 } 914 915 // Note: This is currently not used by VM, as we don't destroy TLS key 916 // on VM exit. 917 void os::free_thread_local_storage(int index) { 918 int rslt = pthread_key_delete((pthread_key_t)index); 919 assert(rslt == 0, "invalid index"); 920 } 921 922 void os::thread_local_storage_at_put(int index, void* value) { 923 int rslt = pthread_setspecific((pthread_key_t)index, value); 924 assert(rslt == 0, "pthread_setspecific failed"); 925 } 926 927 extern "C" Thread* get_thread() { 928 return ThreadLocalStorage::thread(); 929 } 930 931 932 //////////////////////////////////////////////////////////////////////////////// 933 // time support 934 935 // Time since start-up in seconds to a fine granularity. 936 // Used by VMSelfDestructTimer and the MemProfiler. 937 double os::elapsedTime() { 938 939 return (double)(os::elapsed_counter()) * 0.000001; 940 } 941 942 jlong os::elapsed_counter() { 943 timeval time; 944 int status = gettimeofday(&time, NULL); 945 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 946 } 947 948 jlong os::elapsed_frequency() { 949 return (1000 * 1000); 950 } 951 952 // XXX: For now, code this as if BSD does not support vtime. 953 bool os::supports_vtime() { return false; } 954 bool os::enable_vtime() { return false; } 955 bool os::vtime_enabled() { return false; } 956 double os::elapsedVTime() { 957 // better than nothing, but not much 958 return elapsedTime(); 959 } 960 961 jlong os::javaTimeMillis() { 962 timeval time; 963 int status = gettimeofday(&time, NULL); 964 assert(status != -1, "bsd error"); 965 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 966 } 967 968 #ifndef CLOCK_MONOTONIC 969 #define CLOCK_MONOTONIC (1) 970 #endif 971 972 #ifdef __APPLE__ 973 void os::Bsd::clock_init() { 974 // XXXDARWIN: Investigate replacement monotonic clock 975 } 976 #else 977 void os::Bsd::clock_init() { 978 struct timespec res; 979 struct timespec tp; 980 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 981 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 982 // yes, monotonic clock is supported 983 _clock_gettime = ::clock_gettime; 984 } 985 } 986 #endif 987 988 989 jlong os::javaTimeNanos() { 990 if (Bsd::supports_monotonic_clock()) { 991 struct timespec tp; 992 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 993 assert(status == 0, "gettime error"); 994 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 995 return result; 996 } else { 997 timeval time; 998 int status = gettimeofday(&time, NULL); 999 assert(status != -1, "bsd error"); 1000 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1001 return 1000 * usecs; 1002 } 1003 } 1004 1005 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1006 if (Bsd::supports_monotonic_clock()) { 1007 info_ptr->max_value = ALL_64_BITS; 1008 1009 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1010 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1011 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1012 } else { 1013 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1014 info_ptr->max_value = ALL_64_BITS; 1015 1016 // gettimeofday is a real time clock so it skips 1017 info_ptr->may_skip_backward = true; 1018 info_ptr->may_skip_forward = true; 1019 } 1020 1021 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1022 } 1023 1024 // Return the real, user, and system times in seconds from an 1025 // arbitrary fixed point in the past. 1026 bool os::getTimesSecs(double* process_real_time, 1027 double* process_user_time, 1028 double* process_system_time) { 1029 struct tms ticks; 1030 clock_t real_ticks = times(&ticks); 1031 1032 if (real_ticks == (clock_t) (-1)) { 1033 return false; 1034 } else { 1035 double ticks_per_second = (double) clock_tics_per_sec; 1036 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1037 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1038 *process_real_time = ((double) real_ticks) / ticks_per_second; 1039 1040 return true; 1041 } 1042 } 1043 1044 1045 char * os::local_time_string(char *buf, size_t buflen) { 1046 struct tm t; 1047 time_t long_time; 1048 time(&long_time); 1049 localtime_r(&long_time, &t); 1050 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1051 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1052 t.tm_hour, t.tm_min, t.tm_sec); 1053 return buf; 1054 } 1055 1056 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1057 return localtime_r(clock, res); 1058 } 1059 1060 //////////////////////////////////////////////////////////////////////////////// 1061 // runtime exit support 1062 1063 // Note: os::shutdown() might be called very early during initialization, or 1064 // called from signal handler. Before adding something to os::shutdown(), make 1065 // sure it is async-safe and can handle partially initialized VM. 1066 void os::shutdown() { 1067 1068 // allow PerfMemory to attempt cleanup of any persistent resources 1069 perfMemory_exit(); 1070 1071 // needs to remove object in file system 1072 AttachListener::abort(); 1073 1074 // flush buffered output, finish log files 1075 ostream_abort(); 1076 1077 // Check for abort hook 1078 abort_hook_t abort_hook = Arguments::abort_hook(); 1079 if (abort_hook != NULL) { 1080 abort_hook(); 1081 } 1082 1083 } 1084 1085 // Note: os::abort() might be called very early during initialization, or 1086 // called from signal handler. Before adding something to os::abort(), make 1087 // sure it is async-safe and can handle partially initialized VM. 1088 void os::abort(bool dump_core) { 1089 os::shutdown(); 1090 if (dump_core) { 1091 #ifndef PRODUCT 1092 fdStream out(defaultStream::output_fd()); 1093 out.print_raw("Current thread is "); 1094 char buf[16]; 1095 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1096 out.print_raw_cr(buf); 1097 out.print_raw_cr("Dumping core ..."); 1098 #endif 1099 ::abort(); // dump core 1100 } 1101 1102 ::exit(1); 1103 } 1104 1105 // Die immediately, no exit hook, no abort hook, no cleanup. 1106 void os::die() { 1107 // _exit() on BsdThreads only kills current thread 1108 ::abort(); 1109 } 1110 1111 // unused on bsd for now. 1112 void os::set_error_file(const char *logfile) {} 1113 1114 1115 // This method is a copy of JDK's sysGetLastErrorString 1116 // from src/solaris/hpi/src/system_md.c 1117 1118 size_t os::lasterror(char *buf, size_t len) { 1119 1120 if (errno == 0) return 0; 1121 1122 const char *s = ::strerror(errno); 1123 size_t n = ::strlen(s); 1124 if (n >= len) { 1125 n = len - 1; 1126 } 1127 ::strncpy(buf, s, n); 1128 buf[n] = '\0'; 1129 return n; 1130 } 1131 1132 intx os::current_thread_id() { 1133 #ifdef __APPLE__ 1134 return (intx)::mach_thread_self(); 1135 #else 1136 return (intx)::pthread_self(); 1137 #endif 1138 } 1139 int os::current_process_id() { 1140 1141 // Under the old bsd thread library, bsd gives each thread 1142 // its own process id. Because of this each thread will return 1143 // a different pid if this method were to return the result 1144 // of getpid(2). Bsd provides no api that returns the pid 1145 // of the launcher thread for the vm. This implementation 1146 // returns a unique pid, the pid of the launcher thread 1147 // that starts the vm 'process'. 1148 1149 // Under the NPTL, getpid() returns the same pid as the 1150 // launcher thread rather than a unique pid per thread. 1151 // Use gettid() if you want the old pre NPTL behaviour. 1152 1153 // if you are looking for the result of a call to getpid() that 1154 // returns a unique pid for the calling thread, then look at the 1155 // OSThread::thread_id() method in osThread_bsd.hpp file 1156 1157 return (int)(_initial_pid ? _initial_pid : getpid()); 1158 } 1159 1160 // DLL functions 1161 1162 #define JNI_LIB_PREFIX "lib" 1163 #ifdef __APPLE__ 1164 #define JNI_LIB_SUFFIX ".dylib" 1165 #else 1166 #define JNI_LIB_SUFFIX ".so" 1167 #endif 1168 1169 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1170 1171 // This must be hard coded because it's the system's temporary 1172 // directory not the java application's temp directory, ala java.io.tmpdir. 1173 #ifdef __APPLE__ 1174 // macosx has a secure per-user temporary directory 1175 char temp_path_storage[PATH_MAX]; 1176 const char* os::get_temp_directory() { 1177 static char *temp_path = NULL; 1178 if (temp_path == NULL) { 1179 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1180 if (pathSize == 0 || pathSize > PATH_MAX) { 1181 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1182 } 1183 temp_path = temp_path_storage; 1184 } 1185 return temp_path; 1186 } 1187 #else /* __APPLE__ */ 1188 const char* os::get_temp_directory() { return "/tmp"; } 1189 #endif /* __APPLE__ */ 1190 1191 static bool file_exists(const char* filename) { 1192 struct stat statbuf; 1193 if (filename == NULL || strlen(filename) == 0) { 1194 return false; 1195 } 1196 return os::stat(filename, &statbuf) == 0; 1197 } 1198 1199 bool os::dll_build_name(char* buffer, size_t buflen, 1200 const char* pname, const char* fname) { 1201 bool retval = false; 1202 // Copied from libhpi 1203 const size_t pnamelen = pname ? strlen(pname) : 0; 1204 1205 // Return error on buffer overflow. 1206 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1207 return retval; 1208 } 1209 1210 if (pnamelen == 0) { 1211 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1212 retval = true; 1213 } else if (strchr(pname, *os::path_separator()) != NULL) { 1214 int n; 1215 char** pelements = split_path(pname, &n); 1216 for (int i = 0 ; i < n ; i++) { 1217 // Really shouldn't be NULL, but check can't hurt 1218 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1219 continue; // skip the empty path values 1220 } 1221 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1222 pelements[i], fname); 1223 if (file_exists(buffer)) { 1224 retval = true; 1225 break; 1226 } 1227 } 1228 // release the storage 1229 for (int i = 0 ; i < n ; i++) { 1230 if (pelements[i] != NULL) { 1231 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1232 } 1233 } 1234 if (pelements != NULL) { 1235 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1236 } 1237 } else { 1238 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1239 retval = true; 1240 } 1241 return retval; 1242 } 1243 1244 const char* os::get_current_directory(char *buf, int buflen) { 1245 return getcwd(buf, buflen); 1246 } 1247 1248 // check if addr is inside libjvm.so 1249 bool os::address_is_in_vm(address addr) { 1250 static address libjvm_base_addr; 1251 Dl_info dlinfo; 1252 1253 if (libjvm_base_addr == NULL) { 1254 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1255 libjvm_base_addr = (address)dlinfo.dli_fbase; 1256 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1257 } 1258 1259 if (dladdr((void *)addr, &dlinfo)) { 1260 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1261 } 1262 1263 return false; 1264 } 1265 1266 1267 #define MACH_MAXSYMLEN 256 1268 1269 bool os::dll_address_to_function_name(address addr, char *buf, 1270 int buflen, int *offset) { 1271 Dl_info dlinfo; 1272 char localbuf[MACH_MAXSYMLEN]; 1273 1274 // dladdr will find names of dynamic functions only, but does 1275 // it set dli_fbase with mach_header address when it "fails" ? 1276 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1277 if (buf != NULL) { 1278 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1279 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1280 } 1281 } 1282 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1283 return true; 1284 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1285 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1286 buf, buflen, offset, dlinfo.dli_fname)) { 1287 return true; 1288 } 1289 } 1290 1291 // Handle non-dymanic manually: 1292 if (dlinfo.dli_fbase != NULL && 1293 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { 1294 if(!Decoder::demangle(localbuf, buf, buflen)) { 1295 jio_snprintf(buf, buflen, "%s", localbuf); 1296 } 1297 return true; 1298 } 1299 if (buf != NULL) buf[0] = '\0'; 1300 if (offset != NULL) *offset = -1; 1301 return false; 1302 } 1303 1304 // ported from solaris version 1305 bool os::dll_address_to_library_name(address addr, char* buf, 1306 int buflen, int* offset) { 1307 Dl_info dlinfo; 1308 1309 if (dladdr((void*)addr, &dlinfo)){ 1310 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1311 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1312 return true; 1313 } else { 1314 if (buf) buf[0] = '\0'; 1315 if (offset) *offset = -1; 1316 return false; 1317 } 1318 } 1319 1320 // Loads .dll/.so and 1321 // in case of error it checks if .dll/.so was built for the 1322 // same architecture as Hotspot is running on 1323 1324 #ifdef __APPLE__ 1325 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1326 void * result= ::dlopen(filename, RTLD_LAZY); 1327 if (result != NULL) { 1328 // Successful loading 1329 return result; 1330 } 1331 1332 // Read system error message into ebuf 1333 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1334 ebuf[ebuflen-1]='\0'; 1335 1336 return NULL; 1337 } 1338 #else 1339 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1340 { 1341 void * result= ::dlopen(filename, RTLD_LAZY); 1342 if (result != NULL) { 1343 // Successful loading 1344 return result; 1345 } 1346 1347 Elf32_Ehdr elf_head; 1348 1349 // Read system error message into ebuf 1350 // It may or may not be overwritten below 1351 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1352 ebuf[ebuflen-1]='\0'; 1353 int diag_msg_max_length=ebuflen-strlen(ebuf); 1354 char* diag_msg_buf=ebuf+strlen(ebuf); 1355 1356 if (diag_msg_max_length==0) { 1357 // No more space in ebuf for additional diagnostics message 1358 return NULL; 1359 } 1360 1361 1362 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1363 1364 if (file_descriptor < 0) { 1365 // Can't open library, report dlerror() message 1366 return NULL; 1367 } 1368 1369 bool failed_to_read_elf_head= 1370 (sizeof(elf_head)!= 1371 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1372 1373 ::close(file_descriptor); 1374 if (failed_to_read_elf_head) { 1375 // file i/o error - report dlerror() msg 1376 return NULL; 1377 } 1378 1379 typedef struct { 1380 Elf32_Half code; // Actual value as defined in elf.h 1381 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1382 char elf_class; // 32 or 64 bit 1383 char endianess; // MSB or LSB 1384 char* name; // String representation 1385 } arch_t; 1386 1387 #ifndef EM_486 1388 #define EM_486 6 /* Intel 80486 */ 1389 #endif 1390 1391 #ifndef EM_MIPS_RS3_LE 1392 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1393 #endif 1394 1395 #ifndef EM_PPC64 1396 #define EM_PPC64 21 /* PowerPC64 */ 1397 #endif 1398 1399 #ifndef EM_S390 1400 #define EM_S390 22 /* IBM System/390 */ 1401 #endif 1402 1403 #ifndef EM_IA_64 1404 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1405 #endif 1406 1407 #ifndef EM_X86_64 1408 #define EM_X86_64 62 /* AMD x86-64 */ 1409 #endif 1410 1411 static const arch_t arch_array[]={ 1412 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1413 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1414 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1415 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1416 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1417 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1418 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1419 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1420 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1421 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1422 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1423 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1424 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1425 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1426 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1427 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1428 }; 1429 1430 #if (defined IA32) 1431 static Elf32_Half running_arch_code=EM_386; 1432 #elif (defined AMD64) 1433 static Elf32_Half running_arch_code=EM_X86_64; 1434 #elif (defined IA64) 1435 static Elf32_Half running_arch_code=EM_IA_64; 1436 #elif (defined __sparc) && (defined _LP64) 1437 static Elf32_Half running_arch_code=EM_SPARCV9; 1438 #elif (defined __sparc) && (!defined _LP64) 1439 static Elf32_Half running_arch_code=EM_SPARC; 1440 #elif (defined __powerpc64__) 1441 static Elf32_Half running_arch_code=EM_PPC64; 1442 #elif (defined __powerpc__) 1443 static Elf32_Half running_arch_code=EM_PPC; 1444 #elif (defined ARM) 1445 static Elf32_Half running_arch_code=EM_ARM; 1446 #elif (defined S390) 1447 static Elf32_Half running_arch_code=EM_S390; 1448 #elif (defined ALPHA) 1449 static Elf32_Half running_arch_code=EM_ALPHA; 1450 #elif (defined MIPSEL) 1451 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1452 #elif (defined PARISC) 1453 static Elf32_Half running_arch_code=EM_PARISC; 1454 #elif (defined MIPS) 1455 static Elf32_Half running_arch_code=EM_MIPS; 1456 #elif (defined M68K) 1457 static Elf32_Half running_arch_code=EM_68K; 1458 #else 1459 #error Method os::dll_load requires that one of following is defined:\ 1460 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1461 #endif 1462 1463 // Identify compatability class for VM's architecture and library's architecture 1464 // Obtain string descriptions for architectures 1465 1466 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1467 int running_arch_index=-1; 1468 1469 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1470 if (running_arch_code == arch_array[i].code) { 1471 running_arch_index = i; 1472 } 1473 if (lib_arch.code == arch_array[i].code) { 1474 lib_arch.compat_class = arch_array[i].compat_class; 1475 lib_arch.name = arch_array[i].name; 1476 } 1477 } 1478 1479 assert(running_arch_index != -1, 1480 "Didn't find running architecture code (running_arch_code) in arch_array"); 1481 if (running_arch_index == -1) { 1482 // Even though running architecture detection failed 1483 // we may still continue with reporting dlerror() message 1484 return NULL; 1485 } 1486 1487 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1489 return NULL; 1490 } 1491 1492 #ifndef S390 1493 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1494 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1495 return NULL; 1496 } 1497 #endif // !S390 1498 1499 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1500 if ( lib_arch.name!=NULL ) { 1501 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1502 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1503 lib_arch.name, arch_array[running_arch_index].name); 1504 } else { 1505 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1506 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1507 lib_arch.code, 1508 arch_array[running_arch_index].name); 1509 } 1510 } 1511 1512 return NULL; 1513 } 1514 #endif /* !__APPLE__ */ 1515 1516 // XXX: Do we need a lock around this as per Linux? 1517 void* os::dll_lookup(void* handle, const char* name) { 1518 return dlsym(handle, name); 1519 } 1520 1521 1522 static bool _print_ascii_file(const char* filename, outputStream* st) { 1523 int fd = ::open(filename, O_RDONLY); 1524 if (fd == -1) { 1525 return false; 1526 } 1527 1528 char buf[32]; 1529 int bytes; 1530 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1531 st->print_raw(buf, bytes); 1532 } 1533 1534 ::close(fd); 1535 1536 return true; 1537 } 1538 1539 void os::print_dll_info(outputStream *st) { 1540 st->print_cr("Dynamic libraries:"); 1541 #ifdef RTLD_DI_LINKMAP 1542 Dl_info dli; 1543 void *handle; 1544 Link_map *map; 1545 Link_map *p; 1546 1547 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1548 st->print_cr("Error: Cannot print dynamic libraries."); 1549 return; 1550 } 1551 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1552 if (handle == NULL) { 1553 st->print_cr("Error: Cannot print dynamic libraries."); 1554 return; 1555 } 1556 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1557 if (map == NULL) { 1558 st->print_cr("Error: Cannot print dynamic libraries."); 1559 return; 1560 } 1561 1562 while (map->l_prev != NULL) 1563 map = map->l_prev; 1564 1565 while (map != NULL) { 1566 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1567 map = map->l_next; 1568 } 1569 1570 dlclose(handle); 1571 #elif defined(__APPLE__) 1572 uint32_t count; 1573 uint32_t i; 1574 1575 count = _dyld_image_count(); 1576 for (i = 1; i < count; i++) { 1577 const char *name = _dyld_get_image_name(i); 1578 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1579 st->print_cr(PTR_FORMAT " \t%s", slide, name); 1580 } 1581 #else 1582 st->print_cr("Error: Cannot print dynamic libraries."); 1583 #endif 1584 } 1585 1586 void os::print_os_info_brief(outputStream* st) { 1587 st->print("Bsd"); 1588 1589 os::Posix::print_uname_info(st); 1590 } 1591 1592 void os::print_os_info(outputStream* st) { 1593 st->print("OS:"); 1594 st->print("Bsd"); 1595 1596 os::Posix::print_uname_info(st); 1597 1598 os::Posix::print_rlimit_info(st); 1599 1600 os::Posix::print_load_average(st); 1601 } 1602 1603 void os::pd_print_cpu_info(outputStream* st) { 1604 // Nothing to do for now. 1605 } 1606 1607 void os::print_memory_info(outputStream* st) { 1608 1609 st->print("Memory:"); 1610 st->print(" %dk page", os::vm_page_size()>>10); 1611 1612 st->print(", physical " UINT64_FORMAT "k", 1613 os::physical_memory() >> 10); 1614 st->print("(" UINT64_FORMAT "k free)", 1615 os::available_memory() >> 10); 1616 st->cr(); 1617 1618 // meminfo 1619 st->print("\n/proc/meminfo:\n"); 1620 _print_ascii_file("/proc/meminfo", st); 1621 st->cr(); 1622 } 1623 1624 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1625 // but they're the same for all the bsd arch that we support 1626 // and they're the same for solaris but there's no common place to put this. 1627 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1628 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1629 "ILL_COPROC", "ILL_BADSTK" }; 1630 1631 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1632 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1633 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1634 1635 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1636 1637 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1638 1639 void os::print_siginfo(outputStream* st, void* siginfo) { 1640 st->print("siginfo:"); 1641 1642 const int buflen = 100; 1643 char buf[buflen]; 1644 siginfo_t *si = (siginfo_t*)siginfo; 1645 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1646 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1647 st->print("si_errno=%s", buf); 1648 } else { 1649 st->print("si_errno=%d", si->si_errno); 1650 } 1651 const int c = si->si_code; 1652 assert(c > 0, "unexpected si_code"); 1653 switch (si->si_signo) { 1654 case SIGILL: 1655 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1656 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1657 break; 1658 case SIGFPE: 1659 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1660 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1661 break; 1662 case SIGSEGV: 1663 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1664 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1665 break; 1666 case SIGBUS: 1667 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1668 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1669 break; 1670 default: 1671 st->print(", si_code=%d", si->si_code); 1672 // no si_addr 1673 } 1674 1675 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1676 UseSharedSpaces) { 1677 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1678 if (mapinfo->is_in_shared_space(si->si_addr)) { 1679 st->print("\n\nError accessing class data sharing archive." \ 1680 " Mapped file inaccessible during execution, " \ 1681 " possible disk/network problem."); 1682 } 1683 } 1684 st->cr(); 1685 } 1686 1687 1688 static void print_signal_handler(outputStream* st, int sig, 1689 char* buf, size_t buflen); 1690 1691 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1692 st->print_cr("Signal Handlers:"); 1693 print_signal_handler(st, SIGSEGV, buf, buflen); 1694 print_signal_handler(st, SIGBUS , buf, buflen); 1695 print_signal_handler(st, SIGFPE , buf, buflen); 1696 print_signal_handler(st, SIGPIPE, buf, buflen); 1697 print_signal_handler(st, SIGXFSZ, buf, buflen); 1698 print_signal_handler(st, SIGILL , buf, buflen); 1699 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1700 print_signal_handler(st, SR_signum, buf, buflen); 1701 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1702 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1703 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1704 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1705 } 1706 1707 static char saved_jvm_path[MAXPATHLEN] = {0}; 1708 1709 // Find the full path to the current module, libjvm 1710 void os::jvm_path(char *buf, jint buflen) { 1711 // Error checking. 1712 if (buflen < MAXPATHLEN) { 1713 assert(false, "must use a large-enough buffer"); 1714 buf[0] = '\0'; 1715 return; 1716 } 1717 // Lazy resolve the path to current module. 1718 if (saved_jvm_path[0] != 0) { 1719 strcpy(buf, saved_jvm_path); 1720 return; 1721 } 1722 1723 char dli_fname[MAXPATHLEN]; 1724 bool ret = dll_address_to_library_name( 1725 CAST_FROM_FN_PTR(address, os::jvm_path), 1726 dli_fname, sizeof(dli_fname), NULL); 1727 assert(ret != 0, "cannot locate libjvm"); 1728 char *rp = realpath(dli_fname, buf); 1729 if (rp == NULL) 1730 return; 1731 1732 if (Arguments::created_by_gamma_launcher()) { 1733 // Support for the gamma launcher. Typical value for buf is 1734 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1735 // the right place in the string, then assume we are installed in a JDK and 1736 // we're done. Otherwise, check for a JAVA_HOME environment variable and 1737 // construct a path to the JVM being overridden. 1738 1739 const char *p = buf + strlen(buf) - 1; 1740 for (int count = 0; p > buf && count < 5; ++count) { 1741 for (--p; p > buf && *p != '/'; --p) 1742 /* empty */ ; 1743 } 1744 1745 if (strncmp(p, "/jre/lib/", 9) != 0) { 1746 // Look for JAVA_HOME in the environment. 1747 char* java_home_var = ::getenv("JAVA_HOME"); 1748 if (java_home_var != NULL && java_home_var[0] != 0) { 1749 char* jrelib_p; 1750 int len; 1751 1752 // Check the current module name "libjvm" 1753 p = strrchr(buf, '/'); 1754 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1755 1756 rp = realpath(java_home_var, buf); 1757 if (rp == NULL) 1758 return; 1759 1760 // determine if this is a legacy image or modules image 1761 // modules image doesn't have "jre" subdirectory 1762 len = strlen(buf); 1763 jrelib_p = buf + len; 1764 1765 // Add the appropriate library subdir 1766 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1767 if (0 != access(buf, F_OK)) { 1768 snprintf(jrelib_p, buflen-len, "/lib"); 1769 } 1770 1771 // Add the appropriate client or server subdir 1772 len = strlen(buf); 1773 jrelib_p = buf + len; 1774 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1775 if (0 != access(buf, F_OK)) { 1776 snprintf(jrelib_p, buflen-len, ""); 1777 } 1778 1779 // If the path exists within JAVA_HOME, add the JVM library name 1780 // to complete the path to JVM being overridden. Otherwise fallback 1781 // to the path to the current library. 1782 if (0 == access(buf, F_OK)) { 1783 // Use current module name "libjvm" 1784 len = strlen(buf); 1785 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1786 } else { 1787 // Fall back to path of current library 1788 rp = realpath(dli_fname, buf); 1789 if (rp == NULL) 1790 return; 1791 } 1792 } 1793 } 1794 } 1795 1796 strcpy(saved_jvm_path, buf); 1797 } 1798 1799 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1800 // no prefix required, not even "_" 1801 } 1802 1803 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1804 // no suffix required 1805 } 1806 1807 //////////////////////////////////////////////////////////////////////////////// 1808 // sun.misc.Signal support 1809 1810 static volatile jint sigint_count = 0; 1811 1812 static void 1813 UserHandler(int sig, void *siginfo, void *context) { 1814 // 4511530 - sem_post is serialized and handled by the manager thread. When 1815 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1816 // don't want to flood the manager thread with sem_post requests. 1817 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1818 return; 1819 1820 // Ctrl-C is pressed during error reporting, likely because the error 1821 // handler fails to abort. Let VM die immediately. 1822 if (sig == SIGINT && is_error_reported()) { 1823 os::die(); 1824 } 1825 1826 os::signal_notify(sig); 1827 } 1828 1829 void* os::user_handler() { 1830 return CAST_FROM_FN_PTR(void*, UserHandler); 1831 } 1832 1833 extern "C" { 1834 typedef void (*sa_handler_t)(int); 1835 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1836 } 1837 1838 void* os::signal(int signal_number, void* handler) { 1839 struct sigaction sigAct, oldSigAct; 1840 1841 sigfillset(&(sigAct.sa_mask)); 1842 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1843 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1844 1845 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1846 // -1 means registration failed 1847 return (void *)-1; 1848 } 1849 1850 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1851 } 1852 1853 void os::signal_raise(int signal_number) { 1854 ::raise(signal_number); 1855 } 1856 1857 /* 1858 * The following code is moved from os.cpp for making this 1859 * code platform specific, which it is by its very nature. 1860 */ 1861 1862 // Will be modified when max signal is changed to be dynamic 1863 int os::sigexitnum_pd() { 1864 return NSIG; 1865 } 1866 1867 // a counter for each possible signal value 1868 static volatile jint pending_signals[NSIG+1] = { 0 }; 1869 1870 // Bsd(POSIX) specific hand shaking semaphore. 1871 #ifdef __APPLE__ 1872 static semaphore_t sig_sem; 1873 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1874 #define SEM_WAIT(sem) semaphore_wait(sem); 1875 #define SEM_POST(sem) semaphore_signal(sem); 1876 #else 1877 static sem_t sig_sem; 1878 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1879 #define SEM_WAIT(sem) sem_wait(&sem); 1880 #define SEM_POST(sem) sem_post(&sem); 1881 #endif 1882 1883 void os::signal_init_pd() { 1884 // Initialize signal structures 1885 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1886 1887 // Initialize signal semaphore 1888 ::SEM_INIT(sig_sem, 0); 1889 } 1890 1891 void os::signal_notify(int sig) { 1892 Atomic::inc(&pending_signals[sig]); 1893 ::SEM_POST(sig_sem); 1894 } 1895 1896 static int check_pending_signals(bool wait) { 1897 Atomic::store(0, &sigint_count); 1898 for (;;) { 1899 for (int i = 0; i < NSIG + 1; i++) { 1900 jint n = pending_signals[i]; 1901 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1902 return i; 1903 } 1904 } 1905 if (!wait) { 1906 return -1; 1907 } 1908 JavaThread *thread = JavaThread::current(); 1909 ThreadBlockInVM tbivm(thread); 1910 1911 bool threadIsSuspended; 1912 do { 1913 thread->set_suspend_equivalent(); 1914 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1915 ::SEM_WAIT(sig_sem); 1916 1917 // were we externally suspended while we were waiting? 1918 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1919 if (threadIsSuspended) { 1920 // 1921 // The semaphore has been incremented, but while we were waiting 1922 // another thread suspended us. We don't want to continue running 1923 // while suspended because that would surprise the thread that 1924 // suspended us. 1925 // 1926 ::SEM_POST(sig_sem); 1927 1928 thread->java_suspend_self(); 1929 } 1930 } while (threadIsSuspended); 1931 } 1932 } 1933 1934 int os::signal_lookup() { 1935 return check_pending_signals(false); 1936 } 1937 1938 int os::signal_wait() { 1939 return check_pending_signals(true); 1940 } 1941 1942 //////////////////////////////////////////////////////////////////////////////// 1943 // Virtual Memory 1944 1945 int os::vm_page_size() { 1946 // Seems redundant as all get out 1947 assert(os::Bsd::page_size() != -1, "must call os::init"); 1948 return os::Bsd::page_size(); 1949 } 1950 1951 // Solaris allocates memory by pages. 1952 int os::vm_allocation_granularity() { 1953 assert(os::Bsd::page_size() != -1, "must call os::init"); 1954 return os::Bsd::page_size(); 1955 } 1956 1957 // Rationale behind this function: 1958 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1959 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1960 // samples for JITted code. Here we create private executable mapping over the code cache 1961 // and then we can use standard (well, almost, as mapping can change) way to provide 1962 // info for the reporting script by storing timestamp and location of symbol 1963 void bsd_wrap_code(char* base, size_t size) { 1964 static volatile jint cnt = 0; 1965 1966 if (!UseOprofile) { 1967 return; 1968 } 1969 1970 char buf[PATH_MAX + 1]; 1971 int num = Atomic::add(1, &cnt); 1972 1973 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1974 os::get_temp_directory(), os::current_process_id(), num); 1975 unlink(buf); 1976 1977 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1978 1979 if (fd != -1) { 1980 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1981 if (rv != (off_t)-1) { 1982 if (::write(fd, "", 1) == 1) { 1983 mmap(base, size, 1984 PROT_READ|PROT_WRITE|PROT_EXEC, 1985 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1986 } 1987 } 1988 ::close(fd); 1989 unlink(buf); 1990 } 1991 } 1992 1993 // NOTE: Bsd kernel does not really reserve the pages for us. 1994 // All it does is to check if there are enough free pages 1995 // left at the time of mmap(). This could be a potential 1996 // problem. 1997 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1998 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 1999 #ifdef __OpenBSD__ 2000 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2001 return ::mprotect(addr, size, prot) == 0; 2002 #else 2003 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2004 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2005 return res != (uintptr_t) MAP_FAILED; 2006 #endif 2007 } 2008 2009 2010 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2011 bool exec) { 2012 return commit_memory(addr, size, exec); 2013 } 2014 2015 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2016 } 2017 2018 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2019 ::madvise(addr, bytes, MADV_DONTNEED); 2020 } 2021 2022 void os::numa_make_global(char *addr, size_t bytes) { 2023 } 2024 2025 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2026 } 2027 2028 bool os::numa_topology_changed() { return false; } 2029 2030 size_t os::numa_get_groups_num() { 2031 return 1; 2032 } 2033 2034 int os::numa_get_group_id() { 2035 return 0; 2036 } 2037 2038 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2039 if (size > 0) { 2040 ids[0] = 0; 2041 return 1; 2042 } 2043 return 0; 2044 } 2045 2046 bool os::get_page_info(char *start, page_info* info) { 2047 return false; 2048 } 2049 2050 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2051 return end; 2052 } 2053 2054 2055 bool os::pd_uncommit_memory(char* addr, size_t size) { 2056 #ifdef __OpenBSD__ 2057 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2058 return ::mprotect(addr, size, PROT_NONE) == 0; 2059 #else 2060 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2061 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2062 return res != (uintptr_t) MAP_FAILED; 2063 #endif 2064 } 2065 2066 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2067 return os::commit_memory(addr, size); 2068 } 2069 2070 // If this is a growable mapping, remove the guard pages entirely by 2071 // munmap()ping them. If not, just call uncommit_memory(). 2072 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2073 return os::uncommit_memory(addr, size); 2074 } 2075 2076 static address _highest_vm_reserved_address = NULL; 2077 2078 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2079 // at 'requested_addr'. If there are existing memory mappings at the same 2080 // location, however, they will be overwritten. If 'fixed' is false, 2081 // 'requested_addr' is only treated as a hint, the return value may or 2082 // may not start from the requested address. Unlike Bsd mmap(), this 2083 // function returns NULL to indicate failure. 2084 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2085 char * addr; 2086 int flags; 2087 2088 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2089 if (fixed) { 2090 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2091 flags |= MAP_FIXED; 2092 } 2093 2094 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 2095 // to PROT_EXEC if executable when we commit the page. 2096 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 2097 flags, -1, 0); 2098 2099 if (addr != MAP_FAILED) { 2100 // anon_mmap() should only get called during VM initialization, 2101 // don't need lock (actually we can skip locking even it can be called 2102 // from multiple threads, because _highest_vm_reserved_address is just a 2103 // hint about the upper limit of non-stack memory regions.) 2104 if ((address)addr + bytes > _highest_vm_reserved_address) { 2105 _highest_vm_reserved_address = (address)addr + bytes; 2106 } 2107 } 2108 2109 return addr == MAP_FAILED ? NULL : addr; 2110 } 2111 2112 // Don't update _highest_vm_reserved_address, because there might be memory 2113 // regions above addr + size. If so, releasing a memory region only creates 2114 // a hole in the address space, it doesn't help prevent heap-stack collision. 2115 // 2116 static int anon_munmap(char * addr, size_t size) { 2117 return ::munmap(addr, size) == 0; 2118 } 2119 2120 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2121 size_t alignment_hint) { 2122 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2123 } 2124 2125 bool os::pd_release_memory(char* addr, size_t size) { 2126 return anon_munmap(addr, size); 2127 } 2128 2129 static address highest_vm_reserved_address() { 2130 return _highest_vm_reserved_address; 2131 } 2132 2133 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2134 // Bsd wants the mprotect address argument to be page aligned. 2135 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2136 2137 // According to SUSv3, mprotect() should only be used with mappings 2138 // established by mmap(), and mmap() always maps whole pages. Unaligned 2139 // 'addr' likely indicates problem in the VM (e.g. trying to change 2140 // protection of malloc'ed or statically allocated memory). Check the 2141 // caller if you hit this assert. 2142 assert(addr == bottom, "sanity check"); 2143 2144 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2145 return ::mprotect(bottom, size, prot) == 0; 2146 } 2147 2148 // Set protections specified 2149 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2150 bool is_committed) { 2151 unsigned int p = 0; 2152 switch (prot) { 2153 case MEM_PROT_NONE: p = PROT_NONE; break; 2154 case MEM_PROT_READ: p = PROT_READ; break; 2155 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2156 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2157 default: 2158 ShouldNotReachHere(); 2159 } 2160 // is_committed is unused. 2161 return bsd_mprotect(addr, bytes, p); 2162 } 2163 2164 bool os::guard_memory(char* addr, size_t size) { 2165 return bsd_mprotect(addr, size, PROT_NONE); 2166 } 2167 2168 bool os::unguard_memory(char* addr, size_t size) { 2169 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2170 } 2171 2172 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2173 return false; 2174 } 2175 2176 /* 2177 * Set the coredump_filter bits to include largepages in core dump (bit 6) 2178 * 2179 * From the coredump_filter documentation: 2180 * 2181 * - (bit 0) anonymous private memory 2182 * - (bit 1) anonymous shared memory 2183 * - (bit 2) file-backed private memory 2184 * - (bit 3) file-backed shared memory 2185 * - (bit 4) ELF header pages in file-backed private memory areas (it is 2186 * effective only if the bit 2 is cleared) 2187 * - (bit 5) hugetlb private memory 2188 * - (bit 6) hugetlb shared memory 2189 */ 2190 static void set_coredump_filter(void) { 2191 FILE *f; 2192 long cdm; 2193 2194 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 2195 return; 2196 } 2197 2198 if (fscanf(f, "%lx", &cdm) != 1) { 2199 fclose(f); 2200 return; 2201 } 2202 2203 rewind(f); 2204 2205 if ((cdm & LARGEPAGES_BIT) == 0) { 2206 cdm |= LARGEPAGES_BIT; 2207 fprintf(f, "%#lx", cdm); 2208 } 2209 2210 fclose(f); 2211 } 2212 2213 // Large page support 2214 2215 static size_t _large_page_size = 0; 2216 2217 void os::large_page_init() { 2218 } 2219 2220 2221 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 2222 // "exec" is passed in but not used. Creating the shared image for 2223 // the code cache doesn't have an SHM_X executable permission to check. 2224 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2225 2226 key_t key = IPC_PRIVATE; 2227 char *addr; 2228 2229 bool warn_on_failure = UseLargePages && 2230 (!FLAG_IS_DEFAULT(UseLargePages) || 2231 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2232 ); 2233 char msg[128]; 2234 2235 // Create a large shared memory region to attach to based on size. 2236 // Currently, size is the total size of the heap 2237 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2238 if (shmid == -1) { 2239 // Possible reasons for shmget failure: 2240 // 1. shmmax is too small for Java heap. 2241 // > check shmmax value: cat /proc/sys/kernel/shmmax 2242 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2243 // 2. not enough large page memory. 2244 // > check available large pages: cat /proc/meminfo 2245 // > increase amount of large pages: 2246 // echo new_value > /proc/sys/vm/nr_hugepages 2247 // Note 1: different Bsd may use different name for this property, 2248 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2249 // Note 2: it's possible there's enough physical memory available but 2250 // they are so fragmented after a long run that they can't 2251 // coalesce into large pages. Try to reserve large pages when 2252 // the system is still "fresh". 2253 if (warn_on_failure) { 2254 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2255 warning(msg); 2256 } 2257 return NULL; 2258 } 2259 2260 // attach to the region 2261 addr = (char*)shmat(shmid, req_addr, 0); 2262 int err = errno; 2263 2264 // Remove shmid. If shmat() is successful, the actual shared memory segment 2265 // will be deleted when it's detached by shmdt() or when the process 2266 // terminates. If shmat() is not successful this will remove the shared 2267 // segment immediately. 2268 shmctl(shmid, IPC_RMID, NULL); 2269 2270 if ((intptr_t)addr == -1) { 2271 if (warn_on_failure) { 2272 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2273 warning(msg); 2274 } 2275 return NULL; 2276 } 2277 2278 return addr; 2279 } 2280 2281 bool os::release_memory_special(char* base, size_t bytes) { 2282 // detaching the SHM segment will also delete it, see reserve_memory_special() 2283 int rslt = shmdt(base); 2284 return rslt == 0; 2285 } 2286 2287 size_t os::large_page_size() { 2288 return _large_page_size; 2289 } 2290 2291 // HugeTLBFS allows application to commit large page memory on demand; 2292 // with SysV SHM the entire memory region must be allocated as shared 2293 // memory. 2294 bool os::can_commit_large_page_memory() { 2295 return UseHugeTLBFS; 2296 } 2297 2298 bool os::can_execute_large_page_memory() { 2299 return UseHugeTLBFS; 2300 } 2301 2302 // Reserve memory at an arbitrary address, only if that area is 2303 // available (and not reserved for something else). 2304 2305 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2306 const int max_tries = 10; 2307 char* base[max_tries]; 2308 size_t size[max_tries]; 2309 const size_t gap = 0x000000; 2310 2311 // Assert only that the size is a multiple of the page size, since 2312 // that's all that mmap requires, and since that's all we really know 2313 // about at this low abstraction level. If we need higher alignment, 2314 // we can either pass an alignment to this method or verify alignment 2315 // in one of the methods further up the call chain. See bug 5044738. 2316 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2317 2318 // Repeatedly allocate blocks until the block is allocated at the 2319 // right spot. Give up after max_tries. Note that reserve_memory() will 2320 // automatically update _highest_vm_reserved_address if the call is 2321 // successful. The variable tracks the highest memory address every reserved 2322 // by JVM. It is used to detect heap-stack collision if running with 2323 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2324 // space than needed, it could confuse the collision detecting code. To 2325 // solve the problem, save current _highest_vm_reserved_address and 2326 // calculate the correct value before return. 2327 address old_highest = _highest_vm_reserved_address; 2328 2329 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2330 // if kernel honors the hint then we can return immediately. 2331 char * addr = anon_mmap(requested_addr, bytes, false); 2332 if (addr == requested_addr) { 2333 return requested_addr; 2334 } 2335 2336 if (addr != NULL) { 2337 // mmap() is successful but it fails to reserve at the requested address 2338 anon_munmap(addr, bytes); 2339 } 2340 2341 int i; 2342 for (i = 0; i < max_tries; ++i) { 2343 base[i] = reserve_memory(bytes); 2344 2345 if (base[i] != NULL) { 2346 // Is this the block we wanted? 2347 if (base[i] == requested_addr) { 2348 size[i] = bytes; 2349 break; 2350 } 2351 2352 // Does this overlap the block we wanted? Give back the overlapped 2353 // parts and try again. 2354 2355 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2356 if (top_overlap >= 0 && top_overlap < bytes) { 2357 unmap_memory(base[i], top_overlap); 2358 base[i] += top_overlap; 2359 size[i] = bytes - top_overlap; 2360 } else { 2361 size_t bottom_overlap = base[i] + bytes - requested_addr; 2362 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2363 unmap_memory(requested_addr, bottom_overlap); 2364 size[i] = bytes - bottom_overlap; 2365 } else { 2366 size[i] = bytes; 2367 } 2368 } 2369 } 2370 } 2371 2372 // Give back the unused reserved pieces. 2373 2374 for (int j = 0; j < i; ++j) { 2375 if (base[j] != NULL) { 2376 unmap_memory(base[j], size[j]); 2377 } 2378 } 2379 2380 if (i < max_tries) { 2381 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2382 return requested_addr; 2383 } else { 2384 _highest_vm_reserved_address = old_highest; 2385 return NULL; 2386 } 2387 } 2388 2389 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2390 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2391 } 2392 2393 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2394 // Solaris uses poll(), bsd uses park(). 2395 // Poll() is likely a better choice, assuming that Thread.interrupt() 2396 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2397 // SIGSEGV, see 4355769. 2398 2399 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2400 assert(thread == Thread::current(), "thread consistency check"); 2401 2402 ParkEvent * const slp = thread->_SleepEvent ; 2403 slp->reset() ; 2404 OrderAccess::fence() ; 2405 2406 if (interruptible) { 2407 jlong prevtime = javaTimeNanos(); 2408 2409 for (;;) { 2410 if (os::is_interrupted(thread, true)) { 2411 return OS_INTRPT; 2412 } 2413 2414 jlong newtime = javaTimeNanos(); 2415 2416 if (newtime - prevtime < 0) { 2417 // time moving backwards, should only happen if no monotonic clock 2418 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2419 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2420 } else { 2421 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2422 } 2423 2424 if(millis <= 0) { 2425 return OS_OK; 2426 } 2427 2428 prevtime = newtime; 2429 2430 { 2431 assert(thread->is_Java_thread(), "sanity check"); 2432 JavaThread *jt = (JavaThread *) thread; 2433 ThreadBlockInVM tbivm(jt); 2434 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2435 2436 jt->set_suspend_equivalent(); 2437 // cleared by handle_special_suspend_equivalent_condition() or 2438 // java_suspend_self() via check_and_wait_while_suspended() 2439 2440 slp->park(millis); 2441 2442 // were we externally suspended while we were waiting? 2443 jt->check_and_wait_while_suspended(); 2444 } 2445 } 2446 } else { 2447 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2448 jlong prevtime = javaTimeNanos(); 2449 2450 for (;;) { 2451 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2452 // the 1st iteration ... 2453 jlong newtime = javaTimeNanos(); 2454 2455 if (newtime - prevtime < 0) { 2456 // time moving backwards, should only happen if no monotonic clock 2457 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2458 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2459 } else { 2460 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2461 } 2462 2463 if(millis <= 0) break ; 2464 2465 prevtime = newtime; 2466 slp->park(millis); 2467 } 2468 return OS_OK ; 2469 } 2470 } 2471 2472 int os::naked_sleep() { 2473 // %% make the sleep time an integer flag. for now use 1 millisec. 2474 return os::sleep(Thread::current(), 1, false); 2475 } 2476 2477 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2478 void os::infinite_sleep() { 2479 while (true) { // sleep forever ... 2480 ::sleep(100); // ... 100 seconds at a time 2481 } 2482 } 2483 2484 // Used to convert frequent JVM_Yield() to nops 2485 bool os::dont_yield() { 2486 return DontYieldALot; 2487 } 2488 2489 void os::yield() { 2490 sched_yield(); 2491 } 2492 2493 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2494 2495 void os::yield_all(int attempts) { 2496 // Yields to all threads, including threads with lower priorities 2497 // Threads on Bsd are all with same priority. The Solaris style 2498 // os::yield_all() with nanosleep(1ms) is not necessary. 2499 sched_yield(); 2500 } 2501 2502 // Called from the tight loops to possibly influence time-sharing heuristics 2503 void os::loop_breaker(int attempts) { 2504 os::yield_all(attempts); 2505 } 2506 2507 //////////////////////////////////////////////////////////////////////////////// 2508 // thread priority support 2509 2510 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2511 // only supports dynamic priority, static priority must be zero. For real-time 2512 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2513 // However, for large multi-threaded applications, SCHED_RR is not only slower 2514 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2515 // of 5 runs - Sep 2005). 2516 // 2517 // The following code actually changes the niceness of kernel-thread/LWP. It 2518 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2519 // not the entire user process, and user level threads are 1:1 mapped to kernel 2520 // threads. It has always been the case, but could change in the future. For 2521 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2522 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2523 2524 #if !defined(__APPLE__) 2525 int os::java_to_os_priority[CriticalPriority + 1] = { 2526 19, // 0 Entry should never be used 2527 2528 0, // 1 MinPriority 2529 3, // 2 2530 6, // 3 2531 2532 10, // 4 2533 15, // 5 NormPriority 2534 18, // 6 2535 2536 21, // 7 2537 25, // 8 2538 28, // 9 NearMaxPriority 2539 2540 31, // 10 MaxPriority 2541 2542 31 // 11 CriticalPriority 2543 }; 2544 #else 2545 /* Using Mach high-level priority assignments */ 2546 int os::java_to_os_priority[CriticalPriority + 1] = { 2547 0, // 0 Entry should never be used (MINPRI_USER) 2548 2549 27, // 1 MinPriority 2550 28, // 2 2551 29, // 3 2552 2553 30, // 4 2554 31, // 5 NormPriority (BASEPRI_DEFAULT) 2555 32, // 6 2556 2557 33, // 7 2558 34, // 8 2559 35, // 9 NearMaxPriority 2560 2561 36, // 10 MaxPriority 2562 2563 36 // 11 CriticalPriority 2564 }; 2565 #endif 2566 2567 static int prio_init() { 2568 if (ThreadPriorityPolicy == 1) { 2569 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2570 // if effective uid is not root. Perhaps, a more elegant way of doing 2571 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2572 if (geteuid() != 0) { 2573 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2574 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2575 } 2576 ThreadPriorityPolicy = 0; 2577 } 2578 } 2579 if (UseCriticalJavaThreadPriority) { 2580 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2581 } 2582 return 0; 2583 } 2584 2585 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2586 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2587 2588 #ifdef __OpenBSD__ 2589 // OpenBSD pthread_setprio starves low priority threads 2590 return OS_OK; 2591 #elif defined(__FreeBSD__) 2592 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2593 #elif defined(__APPLE__) || defined(__NetBSD__) 2594 struct sched_param sp; 2595 int policy; 2596 pthread_t self = pthread_self(); 2597 2598 if (pthread_getschedparam(self, &policy, &sp) != 0) 2599 return OS_ERR; 2600 2601 sp.sched_priority = newpri; 2602 if (pthread_setschedparam(self, policy, &sp) != 0) 2603 return OS_ERR; 2604 2605 return OS_OK; 2606 #else 2607 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2608 return (ret == 0) ? OS_OK : OS_ERR; 2609 #endif 2610 } 2611 2612 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2613 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2614 *priority_ptr = java_to_os_priority[NormPriority]; 2615 return OS_OK; 2616 } 2617 2618 errno = 0; 2619 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2620 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2621 #elif defined(__APPLE__) || defined(__NetBSD__) 2622 int policy; 2623 struct sched_param sp; 2624 2625 pthread_getschedparam(pthread_self(), &policy, &sp); 2626 *priority_ptr = sp.sched_priority; 2627 #else 2628 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2629 #endif 2630 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2631 } 2632 2633 // Hint to the underlying OS that a task switch would not be good. 2634 // Void return because it's a hint and can fail. 2635 void os::hint_no_preempt() {} 2636 2637 //////////////////////////////////////////////////////////////////////////////// 2638 // suspend/resume support 2639 2640 // the low-level signal-based suspend/resume support is a remnant from the 2641 // old VM-suspension that used to be for java-suspension, safepoints etc, 2642 // within hotspot. Now there is a single use-case for this: 2643 // - calling get_thread_pc() on the VMThread by the flat-profiler task 2644 // that runs in the watcher thread. 2645 // The remaining code is greatly simplified from the more general suspension 2646 // code that used to be used. 2647 // 2648 // The protocol is quite simple: 2649 // - suspend: 2650 // - sends a signal to the target thread 2651 // - polls the suspend state of the osthread using a yield loop 2652 // - target thread signal handler (SR_handler) sets suspend state 2653 // and blocks in sigsuspend until continued 2654 // - resume: 2655 // - sets target osthread state to continue 2656 // - sends signal to end the sigsuspend loop in the SR_handler 2657 // 2658 // Note that the SR_lock plays no role in this suspend/resume protocol. 2659 // 2660 2661 static void resume_clear_context(OSThread *osthread) { 2662 osthread->set_ucontext(NULL); 2663 osthread->set_siginfo(NULL); 2664 2665 // notify the suspend action is completed, we have now resumed 2666 osthread->sr.clear_suspended(); 2667 } 2668 2669 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2670 osthread->set_ucontext(context); 2671 osthread->set_siginfo(siginfo); 2672 } 2673 2674 // 2675 // Handler function invoked when a thread's execution is suspended or 2676 // resumed. We have to be careful that only async-safe functions are 2677 // called here (Note: most pthread functions are not async safe and 2678 // should be avoided.) 2679 // 2680 // Note: sigwait() is a more natural fit than sigsuspend() from an 2681 // interface point of view, but sigwait() prevents the signal hander 2682 // from being run. libpthread would get very confused by not having 2683 // its signal handlers run and prevents sigwait()'s use with the 2684 // mutex granting granting signal. 2685 // 2686 // Currently only ever called on the VMThread 2687 // 2688 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2689 // Save and restore errno to avoid confusing native code with EINTR 2690 // after sigsuspend. 2691 int old_errno = errno; 2692 2693 Thread* thread = Thread::current(); 2694 OSThread* osthread = thread->osthread(); 2695 assert(thread->is_VM_thread(), "Must be VMThread"); 2696 // read current suspend action 2697 int action = osthread->sr.suspend_action(); 2698 if (action == SR_SUSPEND) { 2699 suspend_save_context(osthread, siginfo, context); 2700 2701 // Notify the suspend action is about to be completed. do_suspend() 2702 // waits until SR_SUSPENDED is set and then returns. We will wait 2703 // here for a resume signal and that completes the suspend-other 2704 // action. do_suspend/do_resume is always called as a pair from 2705 // the same thread - so there are no races 2706 2707 // notify the caller 2708 osthread->sr.set_suspended(); 2709 2710 sigset_t suspend_set; // signals for sigsuspend() 2711 2712 // get current set of blocked signals and unblock resume signal 2713 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2714 sigdelset(&suspend_set, SR_signum); 2715 2716 // wait here until we are resumed 2717 do { 2718 sigsuspend(&suspend_set); 2719 // ignore all returns until we get a resume signal 2720 } while (osthread->sr.suspend_action() != SR_CONTINUE); 2721 2722 resume_clear_context(osthread); 2723 2724 } else { 2725 assert(action == SR_CONTINUE, "unexpected sr action"); 2726 // nothing special to do - just leave the handler 2727 } 2728 2729 errno = old_errno; 2730 } 2731 2732 2733 static int SR_initialize() { 2734 struct sigaction act; 2735 char *s; 2736 /* Get signal number to use for suspend/resume */ 2737 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2738 int sig = ::strtol(s, 0, 10); 2739 if (sig > 0 || sig < NSIG) { 2740 SR_signum = sig; 2741 } 2742 } 2743 2744 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2745 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2746 2747 sigemptyset(&SR_sigset); 2748 sigaddset(&SR_sigset, SR_signum); 2749 2750 /* Set up signal handler for suspend/resume */ 2751 act.sa_flags = SA_RESTART|SA_SIGINFO; 2752 act.sa_handler = (void (*)(int)) SR_handler; 2753 2754 // SR_signum is blocked by default. 2755 // 4528190 - We also need to block pthread restart signal (32 on all 2756 // supported Bsd platforms). Note that BsdThreads need to block 2757 // this signal for all threads to work properly. So we don't have 2758 // to use hard-coded signal number when setting up the mask. 2759 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2760 2761 if (sigaction(SR_signum, &act, 0) == -1) { 2762 return -1; 2763 } 2764 2765 // Save signal flag 2766 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2767 return 0; 2768 } 2769 2770 static int SR_finalize() { 2771 return 0; 2772 } 2773 2774 2775 // returns true on success and false on error - really an error is fatal 2776 // but this seems the normal response to library errors 2777 static bool do_suspend(OSThread* osthread) { 2778 // mark as suspended and send signal 2779 osthread->sr.set_suspend_action(SR_SUSPEND); 2780 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2781 assert_status(status == 0, status, "pthread_kill"); 2782 2783 // check status and wait until notified of suspension 2784 if (status == 0) { 2785 for (int i = 0; !osthread->sr.is_suspended(); i++) { 2786 os::yield_all(i); 2787 } 2788 osthread->sr.set_suspend_action(SR_NONE); 2789 return true; 2790 } 2791 else { 2792 osthread->sr.set_suspend_action(SR_NONE); 2793 return false; 2794 } 2795 } 2796 2797 static void do_resume(OSThread* osthread) { 2798 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2799 osthread->sr.set_suspend_action(SR_CONTINUE); 2800 2801 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2802 assert_status(status == 0, status, "pthread_kill"); 2803 // check status and wait unit notified of resumption 2804 if (status == 0) { 2805 for (int i = 0; osthread->sr.is_suspended(); i++) { 2806 os::yield_all(i); 2807 } 2808 } 2809 osthread->sr.set_suspend_action(SR_NONE); 2810 } 2811 2812 //////////////////////////////////////////////////////////////////////////////// 2813 // interrupt support 2814 2815 void os::interrupt(Thread* thread) { 2816 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2817 "possibility of dangling Thread pointer"); 2818 2819 OSThread* osthread = thread->osthread(); 2820 2821 if (!osthread->interrupted()) { 2822 osthread->set_interrupted(true); 2823 // More than one thread can get here with the same value of osthread, 2824 // resulting in multiple notifications. We do, however, want the store 2825 // to interrupted() to be visible to other threads before we execute unpark(). 2826 OrderAccess::fence(); 2827 ParkEvent * const slp = thread->_SleepEvent ; 2828 if (slp != NULL) slp->unpark() ; 2829 } 2830 2831 // For JSR166. Unpark even if interrupt status already was set 2832 if (thread->is_Java_thread()) 2833 ((JavaThread*)thread)->parker()->unpark(); 2834 2835 ParkEvent * ev = thread->_ParkEvent ; 2836 if (ev != NULL) ev->unpark() ; 2837 2838 } 2839 2840 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2841 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2842 "possibility of dangling Thread pointer"); 2843 2844 OSThread* osthread = thread->osthread(); 2845 2846 bool interrupted = osthread->interrupted(); 2847 2848 if (interrupted && clear_interrupted) { 2849 osthread->set_interrupted(false); 2850 // consider thread->_SleepEvent->reset() ... optional optimization 2851 } 2852 2853 return interrupted; 2854 } 2855 2856 /////////////////////////////////////////////////////////////////////////////////// 2857 // signal handling (except suspend/resume) 2858 2859 // This routine may be used by user applications as a "hook" to catch signals. 2860 // The user-defined signal handler must pass unrecognized signals to this 2861 // routine, and if it returns true (non-zero), then the signal handler must 2862 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2863 // routine will never retun false (zero), but instead will execute a VM panic 2864 // routine kill the process. 2865 // 2866 // If this routine returns false, it is OK to call it again. This allows 2867 // the user-defined signal handler to perform checks either before or after 2868 // the VM performs its own checks. Naturally, the user code would be making 2869 // a serious error if it tried to handle an exception (such as a null check 2870 // or breakpoint) that the VM was generating for its own correct operation. 2871 // 2872 // This routine may recognize any of the following kinds of signals: 2873 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2874 // It should be consulted by handlers for any of those signals. 2875 // 2876 // The caller of this routine must pass in the three arguments supplied 2877 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2878 // field of the structure passed to sigaction(). This routine assumes that 2879 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2880 // 2881 // Note that the VM will print warnings if it detects conflicting signal 2882 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2883 // 2884 extern "C" JNIEXPORT int 2885 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2886 void* ucontext, int abort_if_unrecognized); 2887 2888 void signalHandler(int sig, siginfo_t* info, void* uc) { 2889 assert(info != NULL && uc != NULL, "it must be old kernel"); 2890 int orig_errno = errno; // Preserve errno value over signal handler. 2891 JVM_handle_bsd_signal(sig, info, uc, true); 2892 errno = orig_errno; 2893 } 2894 2895 2896 // This boolean allows users to forward their own non-matching signals 2897 // to JVM_handle_bsd_signal, harmlessly. 2898 bool os::Bsd::signal_handlers_are_installed = false; 2899 2900 // For signal-chaining 2901 struct sigaction os::Bsd::sigact[MAXSIGNUM]; 2902 unsigned int os::Bsd::sigs = 0; 2903 bool os::Bsd::libjsig_is_loaded = false; 2904 typedef struct sigaction *(*get_signal_t)(int); 2905 get_signal_t os::Bsd::get_signal_action = NULL; 2906 2907 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2908 struct sigaction *actp = NULL; 2909 2910 if (libjsig_is_loaded) { 2911 // Retrieve the old signal handler from libjsig 2912 actp = (*get_signal_action)(sig); 2913 } 2914 if (actp == NULL) { 2915 // Retrieve the preinstalled signal handler from jvm 2916 actp = get_preinstalled_handler(sig); 2917 } 2918 2919 return actp; 2920 } 2921 2922 static bool call_chained_handler(struct sigaction *actp, int sig, 2923 siginfo_t *siginfo, void *context) { 2924 // Call the old signal handler 2925 if (actp->sa_handler == SIG_DFL) { 2926 // It's more reasonable to let jvm treat it as an unexpected exception 2927 // instead of taking the default action. 2928 return false; 2929 } else if (actp->sa_handler != SIG_IGN) { 2930 if ((actp->sa_flags & SA_NODEFER) == 0) { 2931 // automaticlly block the signal 2932 sigaddset(&(actp->sa_mask), sig); 2933 } 2934 2935 sa_handler_t hand; 2936 sa_sigaction_t sa; 2937 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2938 // retrieve the chained handler 2939 if (siginfo_flag_set) { 2940 sa = actp->sa_sigaction; 2941 } else { 2942 hand = actp->sa_handler; 2943 } 2944 2945 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2946 actp->sa_handler = SIG_DFL; 2947 } 2948 2949 // try to honor the signal mask 2950 sigset_t oset; 2951 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2952 2953 // call into the chained handler 2954 if (siginfo_flag_set) { 2955 (*sa)(sig, siginfo, context); 2956 } else { 2957 (*hand)(sig); 2958 } 2959 2960 // restore the signal mask 2961 pthread_sigmask(SIG_SETMASK, &oset, 0); 2962 } 2963 // Tell jvm's signal handler the signal is taken care of. 2964 return true; 2965 } 2966 2967 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2968 bool chained = false; 2969 // signal-chaining 2970 if (UseSignalChaining) { 2971 struct sigaction *actp = get_chained_signal_action(sig); 2972 if (actp != NULL) { 2973 chained = call_chained_handler(actp, sig, siginfo, context); 2974 } 2975 } 2976 return chained; 2977 } 2978 2979 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2980 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 2981 return &sigact[sig]; 2982 } 2983 return NULL; 2984 } 2985 2986 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2987 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2988 sigact[sig] = oldAct; 2989 sigs |= (unsigned int)1 << sig; 2990 } 2991 2992 // for diagnostic 2993 int os::Bsd::sigflags[MAXSIGNUM]; 2994 2995 int os::Bsd::get_our_sigflags(int sig) { 2996 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2997 return sigflags[sig]; 2998 } 2999 3000 void os::Bsd::set_our_sigflags(int sig, int flags) { 3001 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3002 sigflags[sig] = flags; 3003 } 3004 3005 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3006 // Check for overwrite. 3007 struct sigaction oldAct; 3008 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3009 3010 void* oldhand = oldAct.sa_sigaction 3011 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3012 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3013 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3014 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3015 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3016 if (AllowUserSignalHandlers || !set_installed) { 3017 // Do not overwrite; user takes responsibility to forward to us. 3018 return; 3019 } else if (UseSignalChaining) { 3020 // save the old handler in jvm 3021 save_preinstalled_handler(sig, oldAct); 3022 // libjsig also interposes the sigaction() call below and saves the 3023 // old sigaction on it own. 3024 } else { 3025 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3026 "%#lx for signal %d.", (long)oldhand, sig)); 3027 } 3028 } 3029 3030 struct sigaction sigAct; 3031 sigfillset(&(sigAct.sa_mask)); 3032 sigAct.sa_handler = SIG_DFL; 3033 if (!set_installed) { 3034 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3035 } else { 3036 sigAct.sa_sigaction = signalHandler; 3037 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3038 } 3039 // Save flags, which are set by ours 3040 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3041 sigflags[sig] = sigAct.sa_flags; 3042 3043 int ret = sigaction(sig, &sigAct, &oldAct); 3044 assert(ret == 0, "check"); 3045 3046 void* oldhand2 = oldAct.sa_sigaction 3047 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3048 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3049 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3050 } 3051 3052 // install signal handlers for signals that HotSpot needs to 3053 // handle in order to support Java-level exception handling. 3054 3055 void os::Bsd::install_signal_handlers() { 3056 if (!signal_handlers_are_installed) { 3057 signal_handlers_are_installed = true; 3058 3059 // signal-chaining 3060 typedef void (*signal_setting_t)(); 3061 signal_setting_t begin_signal_setting = NULL; 3062 signal_setting_t end_signal_setting = NULL; 3063 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3064 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3065 if (begin_signal_setting != NULL) { 3066 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3067 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3068 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3069 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3070 libjsig_is_loaded = true; 3071 assert(UseSignalChaining, "should enable signal-chaining"); 3072 } 3073 if (libjsig_is_loaded) { 3074 // Tell libjsig jvm is setting signal handlers 3075 (*begin_signal_setting)(); 3076 } 3077 3078 set_signal_handler(SIGSEGV, true); 3079 set_signal_handler(SIGPIPE, true); 3080 set_signal_handler(SIGBUS, true); 3081 set_signal_handler(SIGILL, true); 3082 set_signal_handler(SIGFPE, true); 3083 set_signal_handler(SIGXFSZ, true); 3084 3085 #if defined(__APPLE__) 3086 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3087 // signals caught and handled by the JVM. To work around this, we reset the mach task 3088 // signal handler that's placed on our process by CrashReporter. This disables 3089 // CrashReporter-based reporting. 3090 // 3091 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3092 // on caught fatal signals. 3093 // 3094 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3095 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3096 // exception handling, while leaving the standard BSD signal handlers functional. 3097 kern_return_t kr; 3098 kr = task_set_exception_ports(mach_task_self(), 3099 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3100 MACH_PORT_NULL, 3101 EXCEPTION_STATE_IDENTITY, 3102 MACHINE_THREAD_STATE); 3103 3104 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3105 #endif 3106 3107 if (libjsig_is_loaded) { 3108 // Tell libjsig jvm finishes setting signal handlers 3109 (*end_signal_setting)(); 3110 } 3111 3112 // We don't activate signal checker if libjsig is in place, we trust ourselves 3113 // and if UserSignalHandler is installed all bets are off 3114 if (CheckJNICalls) { 3115 if (libjsig_is_loaded) { 3116 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3117 check_signals = false; 3118 } 3119 if (AllowUserSignalHandlers) { 3120 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3121 check_signals = false; 3122 } 3123 } 3124 } 3125 } 3126 3127 3128 ///// 3129 // glibc on Bsd platform uses non-documented flag 3130 // to indicate, that some special sort of signal 3131 // trampoline is used. 3132 // We will never set this flag, and we should 3133 // ignore this flag in our diagnostic 3134 #ifdef SIGNIFICANT_SIGNAL_MASK 3135 #undef SIGNIFICANT_SIGNAL_MASK 3136 #endif 3137 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3138 3139 static const char* get_signal_handler_name(address handler, 3140 char* buf, int buflen) { 3141 int offset; 3142 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3143 if (found) { 3144 // skip directory names 3145 const char *p1, *p2; 3146 p1 = buf; 3147 size_t len = strlen(os::file_separator()); 3148 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3149 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3150 } else { 3151 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3152 } 3153 return buf; 3154 } 3155 3156 static void print_signal_handler(outputStream* st, int sig, 3157 char* buf, size_t buflen) { 3158 struct sigaction sa; 3159 3160 sigaction(sig, NULL, &sa); 3161 3162 // See comment for SIGNIFICANT_SIGNAL_MASK define 3163 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3164 3165 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3166 3167 address handler = (sa.sa_flags & SA_SIGINFO) 3168 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3169 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3170 3171 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3172 st->print("SIG_DFL"); 3173 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3174 st->print("SIG_IGN"); 3175 } else { 3176 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3177 } 3178 3179 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3180 3181 address rh = VMError::get_resetted_sighandler(sig); 3182 // May be, handler was resetted by VMError? 3183 if(rh != NULL) { 3184 handler = rh; 3185 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3186 } 3187 3188 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3189 3190 // Check: is it our handler? 3191 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3192 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3193 // It is our signal handler 3194 // check for flags, reset system-used one! 3195 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3196 st->print( 3197 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3198 os::Bsd::get_our_sigflags(sig)); 3199 } 3200 } 3201 st->cr(); 3202 } 3203 3204 3205 #define DO_SIGNAL_CHECK(sig) \ 3206 if (!sigismember(&check_signal_done, sig)) \ 3207 os::Bsd::check_signal_handler(sig) 3208 3209 // This method is a periodic task to check for misbehaving JNI applications 3210 // under CheckJNI, we can add any periodic checks here 3211 3212 void os::run_periodic_checks() { 3213 3214 if (check_signals == false) return; 3215 3216 // SEGV and BUS if overridden could potentially prevent 3217 // generation of hs*.log in the event of a crash, debugging 3218 // such a case can be very challenging, so we absolutely 3219 // check the following for a good measure: 3220 DO_SIGNAL_CHECK(SIGSEGV); 3221 DO_SIGNAL_CHECK(SIGILL); 3222 DO_SIGNAL_CHECK(SIGFPE); 3223 DO_SIGNAL_CHECK(SIGBUS); 3224 DO_SIGNAL_CHECK(SIGPIPE); 3225 DO_SIGNAL_CHECK(SIGXFSZ); 3226 3227 3228 // ReduceSignalUsage allows the user to override these handlers 3229 // see comments at the very top and jvm_solaris.h 3230 if (!ReduceSignalUsage) { 3231 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3232 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3233 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3234 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3235 } 3236 3237 DO_SIGNAL_CHECK(SR_signum); 3238 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3239 } 3240 3241 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3242 3243 static os_sigaction_t os_sigaction = NULL; 3244 3245 void os::Bsd::check_signal_handler(int sig) { 3246 char buf[O_BUFLEN]; 3247 address jvmHandler = NULL; 3248 3249 3250 struct sigaction act; 3251 if (os_sigaction == NULL) { 3252 // only trust the default sigaction, in case it has been interposed 3253 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3254 if (os_sigaction == NULL) return; 3255 } 3256 3257 os_sigaction(sig, (struct sigaction*)NULL, &act); 3258 3259 3260 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3261 3262 address thisHandler = (act.sa_flags & SA_SIGINFO) 3263 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3264 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3265 3266 3267 switch(sig) { 3268 case SIGSEGV: 3269 case SIGBUS: 3270 case SIGFPE: 3271 case SIGPIPE: 3272 case SIGILL: 3273 case SIGXFSZ: 3274 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3275 break; 3276 3277 case SHUTDOWN1_SIGNAL: 3278 case SHUTDOWN2_SIGNAL: 3279 case SHUTDOWN3_SIGNAL: 3280 case BREAK_SIGNAL: 3281 jvmHandler = (address)user_handler(); 3282 break; 3283 3284 case INTERRUPT_SIGNAL: 3285 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3286 break; 3287 3288 default: 3289 if (sig == SR_signum) { 3290 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3291 } else { 3292 return; 3293 } 3294 break; 3295 } 3296 3297 if (thisHandler != jvmHandler) { 3298 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3299 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3300 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3301 // No need to check this sig any longer 3302 sigaddset(&check_signal_done, sig); 3303 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3304 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3305 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3306 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3307 // No need to check this sig any longer 3308 sigaddset(&check_signal_done, sig); 3309 } 3310 3311 // Dump all the signal 3312 if (sigismember(&check_signal_done, sig)) { 3313 print_signal_handlers(tty, buf, O_BUFLEN); 3314 } 3315 } 3316 3317 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3318 3319 extern bool signal_name(int signo, char* buf, size_t len); 3320 3321 const char* os::exception_name(int exception_code, char* buf, size_t size) { 3322 if (0 < exception_code && exception_code <= SIGRTMAX) { 3323 // signal 3324 if (!signal_name(exception_code, buf, size)) { 3325 jio_snprintf(buf, size, "SIG%d", exception_code); 3326 } 3327 return buf; 3328 } else { 3329 return NULL; 3330 } 3331 } 3332 3333 // this is called _before_ the most of global arguments have been parsed 3334 void os::init(void) { 3335 char dummy; /* used to get a guess on initial stack address */ 3336 // first_hrtime = gethrtime(); 3337 3338 // With BsdThreads the JavaMain thread pid (primordial thread) 3339 // is different than the pid of the java launcher thread. 3340 // So, on Bsd, the launcher thread pid is passed to the VM 3341 // via the sun.java.launcher.pid property. 3342 // Use this property instead of getpid() if it was correctly passed. 3343 // See bug 6351349. 3344 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3345 3346 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3347 3348 clock_tics_per_sec = CLK_TCK; 3349 3350 init_random(1234567); 3351 3352 ThreadCritical::initialize(); 3353 3354 Bsd::set_page_size(getpagesize()); 3355 if (Bsd::page_size() == -1) { 3356 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3357 strerror(errno))); 3358 } 3359 init_page_sizes((size_t) Bsd::page_size()); 3360 3361 Bsd::initialize_system_info(); 3362 3363 // main_thread points to the aboriginal thread 3364 Bsd::_main_thread = pthread_self(); 3365 3366 Bsd::clock_init(); 3367 initial_time_count = os::elapsed_counter(); 3368 3369 #ifdef __APPLE__ 3370 // XXXDARWIN 3371 // Work around the unaligned VM callbacks in hotspot's 3372 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3373 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3374 // alignment when doing symbol lookup. To work around this, we force early 3375 // binding of all symbols now, thus binding when alignment is known-good. 3376 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3377 #endif 3378 } 3379 3380 // To install functions for atexit system call 3381 extern "C" { 3382 static void perfMemory_exit_helper() { 3383 perfMemory_exit(); 3384 } 3385 } 3386 3387 // this is called _after_ the global arguments have been parsed 3388 jint os::init_2(void) 3389 { 3390 // Allocate a single page and mark it as readable for safepoint polling 3391 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3392 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3393 3394 os::set_polling_page( polling_page ); 3395 3396 #ifndef PRODUCT 3397 if(Verbose && PrintMiscellaneous) 3398 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3399 #endif 3400 3401 if (!UseMembar) { 3402 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3403 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 3404 os::set_memory_serialize_page( mem_serialize_page ); 3405 3406 #ifndef PRODUCT 3407 if(Verbose && PrintMiscellaneous) 3408 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3409 #endif 3410 } 3411 3412 os::large_page_init(); 3413 3414 // initialize suspend/resume support - must do this before signal_sets_init() 3415 if (SR_initialize() != 0) { 3416 perror("SR_initialize failed"); 3417 return JNI_ERR; 3418 } 3419 3420 Bsd::signal_sets_init(); 3421 Bsd::install_signal_handlers(); 3422 3423 // Check minimum allowable stack size for thread creation and to initialize 3424 // the java system classes, including StackOverflowError - depends on page 3425 // size. Add a page for compiler2 recursion in main thread. 3426 // Add in 2*BytesPerWord times page size to account for VM stack during 3427 // class initialization depending on 32 or 64 bit VM. 3428 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3429 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3430 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3431 3432 size_t threadStackSizeInBytes = ThreadStackSize * K; 3433 if (threadStackSizeInBytes != 0 && 3434 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3435 tty->print_cr("\nThe stack size specified is too small, " 3436 "Specify at least %dk", 3437 os::Bsd::min_stack_allowed/ K); 3438 return JNI_ERR; 3439 } 3440 3441 // Make the stack size a multiple of the page size so that 3442 // the yellow/red zones can be guarded. 3443 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3444 vm_page_size())); 3445 3446 if (MaxFDLimit) { 3447 // set the number of file descriptors to max. print out error 3448 // if getrlimit/setrlimit fails but continue regardless. 3449 struct rlimit nbr_files; 3450 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3451 if (status != 0) { 3452 if (PrintMiscellaneous && (Verbose || WizardMode)) 3453 perror("os::init_2 getrlimit failed"); 3454 } else { 3455 nbr_files.rlim_cur = nbr_files.rlim_max; 3456 3457 #ifdef __APPLE__ 3458 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3459 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3460 // be used instead 3461 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3462 #endif 3463 3464 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3465 if (status != 0) { 3466 if (PrintMiscellaneous && (Verbose || WizardMode)) 3467 perror("os::init_2 setrlimit failed"); 3468 } 3469 } 3470 } 3471 3472 // at-exit methods are called in the reverse order of their registration. 3473 // atexit functions are called on return from main or as a result of a 3474 // call to exit(3C). There can be only 32 of these functions registered 3475 // and atexit() does not set errno. 3476 3477 if (PerfAllowAtExitRegistration) { 3478 // only register atexit functions if PerfAllowAtExitRegistration is set. 3479 // atexit functions can be delayed until process exit time, which 3480 // can be problematic for embedded VM situations. Embedded VMs should 3481 // call DestroyJavaVM() to assure that VM resources are released. 3482 3483 // note: perfMemory_exit_helper atexit function may be removed in 3484 // the future if the appropriate cleanup code can be added to the 3485 // VM_Exit VMOperation's doit method. 3486 if (atexit(perfMemory_exit_helper) != 0) { 3487 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3488 } 3489 } 3490 3491 // initialize thread priority policy 3492 prio_init(); 3493 3494 #ifdef __APPLE__ 3495 // dynamically link to objective c gc registration 3496 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3497 if (handleLibObjc != NULL) { 3498 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3499 } 3500 #endif 3501 3502 return JNI_OK; 3503 } 3504 3505 // this is called at the end of vm_initialization 3506 void os::init_3(void) { } 3507 3508 // Mark the polling page as unreadable 3509 void os::make_polling_page_unreadable(void) { 3510 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3511 fatal("Could not disable polling page"); 3512 }; 3513 3514 // Mark the polling page as readable 3515 void os::make_polling_page_readable(void) { 3516 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3517 fatal("Could not enable polling page"); 3518 } 3519 }; 3520 3521 int os::active_processor_count() { 3522 return _processor_count; 3523 } 3524 3525 void os::set_native_thread_name(const char *name) { 3526 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3527 // This is only supported in Snow Leopard and beyond 3528 if (name != NULL) { 3529 // Add a "Java: " prefix to the name 3530 char buf[MAXTHREADNAMESIZE]; 3531 snprintf(buf, sizeof(buf), "Java: %s", name); 3532 pthread_setname_np(buf); 3533 } 3534 #endif 3535 } 3536 3537 bool os::distribute_processes(uint length, uint* distribution) { 3538 // Not yet implemented. 3539 return false; 3540 } 3541 3542 bool os::bind_to_processor(uint processor_id) { 3543 // Not yet implemented. 3544 return false; 3545 } 3546 3547 /// 3548 3549 // Suspends the target using the signal mechanism and then grabs the PC before 3550 // resuming the target. Used by the flat-profiler only 3551 ExtendedPC os::get_thread_pc(Thread* thread) { 3552 // Make sure that it is called by the watcher for the VMThread 3553 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3554 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3555 3556 ExtendedPC epc; 3557 3558 OSThread* osthread = thread->osthread(); 3559 if (do_suspend(osthread)) { 3560 if (osthread->ucontext() != NULL) { 3561 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 3562 } else { 3563 // NULL context is unexpected, double-check this is the VMThread 3564 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3565 } 3566 do_resume(osthread); 3567 } 3568 // failure means pthread_kill failed for some reason - arguably this is 3569 // a fatal problem, but such problems are ignored elsewhere 3570 3571 return epc; 3572 } 3573 3574 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3575 { 3576 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3577 } 3578 3579 //////////////////////////////////////////////////////////////////////////////// 3580 // debug support 3581 3582 static address same_page(address x, address y) { 3583 int page_bits = -os::vm_page_size(); 3584 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 3585 return x; 3586 else if (x > y) 3587 return (address)(intptr_t(y) | ~page_bits) + 1; 3588 else 3589 return (address)(intptr_t(y) & page_bits); 3590 } 3591 3592 bool os::find(address addr, outputStream* st) { 3593 Dl_info dlinfo; 3594 memset(&dlinfo, 0, sizeof(dlinfo)); 3595 if (dladdr(addr, &dlinfo)) { 3596 st->print(PTR_FORMAT ": ", addr); 3597 if (dlinfo.dli_sname != NULL) { 3598 st->print("%s+%#x", dlinfo.dli_sname, 3599 addr - (intptr_t)dlinfo.dli_saddr); 3600 } else if (dlinfo.dli_fname) { 3601 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3602 } else { 3603 st->print("<absolute address>"); 3604 } 3605 if (dlinfo.dli_fname) { 3606 st->print(" in %s", dlinfo.dli_fname); 3607 } 3608 if (dlinfo.dli_fbase) { 3609 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3610 } 3611 st->cr(); 3612 3613 if (Verbose) { 3614 // decode some bytes around the PC 3615 address begin = same_page(addr-40, addr); 3616 address end = same_page(addr+40, addr); 3617 address lowest = (address) dlinfo.dli_sname; 3618 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3619 if (begin < lowest) begin = lowest; 3620 Dl_info dlinfo2; 3621 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 3622 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3623 end = (address) dlinfo2.dli_saddr; 3624 Disassembler::decode(begin, end, st); 3625 } 3626 return true; 3627 } 3628 return false; 3629 } 3630 3631 //////////////////////////////////////////////////////////////////////////////// 3632 // misc 3633 3634 // This does not do anything on Bsd. This is basically a hook for being 3635 // able to use structured exception handling (thread-local exception filters) 3636 // on, e.g., Win32. 3637 void 3638 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3639 JavaCallArguments* args, Thread* thread) { 3640 f(value, method, args, thread); 3641 } 3642 3643 void os::print_statistics() { 3644 } 3645 3646 int os::message_box(const char* title, const char* message) { 3647 int i; 3648 fdStream err(defaultStream::error_fd()); 3649 for (i = 0; i < 78; i++) err.print_raw("="); 3650 err.cr(); 3651 err.print_raw_cr(title); 3652 for (i = 0; i < 78; i++) err.print_raw("-"); 3653 err.cr(); 3654 err.print_raw_cr(message); 3655 for (i = 0; i < 78; i++) err.print_raw("="); 3656 err.cr(); 3657 3658 char buf[16]; 3659 // Prevent process from exiting upon "read error" without consuming all CPU 3660 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3661 3662 return buf[0] == 'y' || buf[0] == 'Y'; 3663 } 3664 3665 int os::stat(const char *path, struct stat *sbuf) { 3666 char pathbuf[MAX_PATH]; 3667 if (strlen(path) > MAX_PATH - 1) { 3668 errno = ENAMETOOLONG; 3669 return -1; 3670 } 3671 os::native_path(strcpy(pathbuf, path)); 3672 return ::stat(pathbuf, sbuf); 3673 } 3674 3675 bool os::check_heap(bool force) { 3676 return true; 3677 } 3678 3679 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3680 return ::vsnprintf(buf, count, format, args); 3681 } 3682 3683 // Is a (classpath) directory empty? 3684 bool os::dir_is_empty(const char* path) { 3685 DIR *dir = NULL; 3686 struct dirent *ptr; 3687 3688 dir = opendir(path); 3689 if (dir == NULL) return true; 3690 3691 /* Scan the directory */ 3692 bool result = true; 3693 char buf[sizeof(struct dirent) + MAX_PATH]; 3694 while (result && (ptr = ::readdir(dir)) != NULL) { 3695 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3696 result = false; 3697 } 3698 } 3699 closedir(dir); 3700 return result; 3701 } 3702 3703 // This code originates from JDK's sysOpen and open64_w 3704 // from src/solaris/hpi/src/system_md.c 3705 3706 #ifndef O_DELETE 3707 #define O_DELETE 0x10000 3708 #endif 3709 3710 // Open a file. Unlink the file immediately after open returns 3711 // if the specified oflag has the O_DELETE flag set. 3712 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3713 3714 int os::open(const char *path, int oflag, int mode) { 3715 3716 if (strlen(path) > MAX_PATH - 1) { 3717 errno = ENAMETOOLONG; 3718 return -1; 3719 } 3720 int fd; 3721 int o_delete = (oflag & O_DELETE); 3722 oflag = oflag & ~O_DELETE; 3723 3724 fd = ::open(path, oflag, mode); 3725 if (fd == -1) return -1; 3726 3727 //If the open succeeded, the file might still be a directory 3728 { 3729 struct stat buf; 3730 int ret = ::fstat(fd, &buf); 3731 int st_mode = buf.st_mode; 3732 3733 if (ret != -1) { 3734 if ((st_mode & S_IFMT) == S_IFDIR) { 3735 errno = EISDIR; 3736 ::close(fd); 3737 return -1; 3738 } 3739 } else { 3740 ::close(fd); 3741 return -1; 3742 } 3743 } 3744 3745 /* 3746 * All file descriptors that are opened in the JVM and not 3747 * specifically destined for a subprocess should have the 3748 * close-on-exec flag set. If we don't set it, then careless 3rd 3749 * party native code might fork and exec without closing all 3750 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3751 * UNIXProcess.c), and this in turn might: 3752 * 3753 * - cause end-of-file to fail to be detected on some file 3754 * descriptors, resulting in mysterious hangs, or 3755 * 3756 * - might cause an fopen in the subprocess to fail on a system 3757 * suffering from bug 1085341. 3758 * 3759 * (Yes, the default setting of the close-on-exec flag is a Unix 3760 * design flaw) 3761 * 3762 * See: 3763 * 1085341: 32-bit stdio routines should support file descriptors >255 3764 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3765 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3766 */ 3767 #ifdef FD_CLOEXEC 3768 { 3769 int flags = ::fcntl(fd, F_GETFD); 3770 if (flags != -1) 3771 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3772 } 3773 #endif 3774 3775 if (o_delete != 0) { 3776 ::unlink(path); 3777 } 3778 return fd; 3779 } 3780 3781 3782 // create binary file, rewriting existing file if required 3783 int os::create_binary_file(const char* path, bool rewrite_existing) { 3784 int oflags = O_WRONLY | O_CREAT; 3785 if (!rewrite_existing) { 3786 oflags |= O_EXCL; 3787 } 3788 return ::open(path, oflags, S_IREAD | S_IWRITE); 3789 } 3790 3791 // return current position of file pointer 3792 jlong os::current_file_offset(int fd) { 3793 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3794 } 3795 3796 // move file pointer to the specified offset 3797 jlong os::seek_to_file_offset(int fd, jlong offset) { 3798 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3799 } 3800 3801 // This code originates from JDK's sysAvailable 3802 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3803 3804 int os::available(int fd, jlong *bytes) { 3805 jlong cur, end; 3806 int mode; 3807 struct stat buf; 3808 3809 if (::fstat(fd, &buf) >= 0) { 3810 mode = buf.st_mode; 3811 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3812 /* 3813 * XXX: is the following call interruptible? If so, this might 3814 * need to go through the INTERRUPT_IO() wrapper as for other 3815 * blocking, interruptible calls in this file. 3816 */ 3817 int n; 3818 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3819 *bytes = n; 3820 return 1; 3821 } 3822 } 3823 } 3824 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3825 return 0; 3826 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3827 return 0; 3828 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3829 return 0; 3830 } 3831 *bytes = end - cur; 3832 return 1; 3833 } 3834 3835 int os::socket_available(int fd, jint *pbytes) { 3836 if (fd < 0) 3837 return OS_OK; 3838 3839 int ret; 3840 3841 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 3842 3843 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 3844 // is expected to return 0 on failure and 1 on success to the jdk. 3845 3846 return (ret == OS_ERR) ? 0 : 1; 3847 } 3848 3849 // Map a block of memory. 3850 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3851 char *addr, size_t bytes, bool read_only, 3852 bool allow_exec) { 3853 int prot; 3854 int flags; 3855 3856 if (read_only) { 3857 prot = PROT_READ; 3858 flags = MAP_SHARED; 3859 } else { 3860 prot = PROT_READ | PROT_WRITE; 3861 flags = MAP_PRIVATE; 3862 } 3863 3864 if (allow_exec) { 3865 prot |= PROT_EXEC; 3866 } 3867 3868 if (addr != NULL) { 3869 flags |= MAP_FIXED; 3870 } 3871 3872 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3873 fd, file_offset); 3874 if (mapped_address == MAP_FAILED) { 3875 return NULL; 3876 } 3877 return mapped_address; 3878 } 3879 3880 3881 // Remap a block of memory. 3882 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3883 char *addr, size_t bytes, bool read_only, 3884 bool allow_exec) { 3885 // same as map_memory() on this OS 3886 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3887 allow_exec); 3888 } 3889 3890 3891 // Unmap a block of memory. 3892 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3893 return munmap(addr, bytes) == 0; 3894 } 3895 3896 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3897 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3898 // of a thread. 3899 // 3900 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3901 // the fast estimate available on the platform. 3902 3903 jlong os::current_thread_cpu_time() { 3904 #ifdef __APPLE__ 3905 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3906 #endif 3907 } 3908 3909 jlong os::thread_cpu_time(Thread* thread) { 3910 } 3911 3912 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3913 #ifdef __APPLE__ 3914 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3915 #endif 3916 } 3917 3918 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3919 #ifdef __APPLE__ 3920 struct thread_basic_info tinfo; 3921 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3922 kern_return_t kr; 3923 thread_t mach_thread; 3924 3925 mach_thread = thread->osthread()->thread_id(); 3926 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3927 if (kr != KERN_SUCCESS) 3928 return -1; 3929 3930 if (user_sys_cpu_time) { 3931 jlong nanos; 3932 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3933 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3934 return nanos; 3935 } else { 3936 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3937 } 3938 #endif 3939 } 3940 3941 3942 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3943 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3944 info_ptr->may_skip_backward = false; // elapsed time not wall time 3945 info_ptr->may_skip_forward = false; // elapsed time not wall time 3946 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3947 } 3948 3949 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3950 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3951 info_ptr->may_skip_backward = false; // elapsed time not wall time 3952 info_ptr->may_skip_forward = false; // elapsed time not wall time 3953 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3954 } 3955 3956 bool os::is_thread_cpu_time_supported() { 3957 #ifdef __APPLE__ 3958 return true; 3959 #else 3960 return false; 3961 #endif 3962 } 3963 3964 // System loadavg support. Returns -1 if load average cannot be obtained. 3965 // Bsd doesn't yet have a (official) notion of processor sets, 3966 // so just return the system wide load average. 3967 int os::loadavg(double loadavg[], int nelem) { 3968 return ::getloadavg(loadavg, nelem); 3969 } 3970 3971 void os::pause() { 3972 char filename[MAX_PATH]; 3973 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3974 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3975 } else { 3976 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3977 } 3978 3979 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3980 if (fd != -1) { 3981 struct stat buf; 3982 ::close(fd); 3983 while (::stat(filename, &buf) == 0) { 3984 (void)::poll(NULL, 0, 100); 3985 } 3986 } else { 3987 jio_fprintf(stderr, 3988 "Could not open pause file '%s', continuing immediately.\n", filename); 3989 } 3990 } 3991 3992 3993 // Refer to the comments in os_solaris.cpp park-unpark. 3994 // 3995 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 3996 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 3997 // For specifics regarding the bug see GLIBC BUGID 261237 : 3998 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 3999 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 4000 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4001 // is used. (The simple C test-case provided in the GLIBC bug report manifests the 4002 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4003 // and monitorenter when we're using 1-0 locking. All those operations may result in 4004 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4005 // of libpthread avoids the problem, but isn't practical. 4006 // 4007 // Possible remedies: 4008 // 4009 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4010 // This is palliative and probabilistic, however. If the thread is preempted 4011 // between the call to compute_abstime() and pthread_cond_timedwait(), more 4012 // than the minimum period may have passed, and the abstime may be stale (in the 4013 // past) resultin in a hang. Using this technique reduces the odds of a hang 4014 // but the JVM is still vulnerable, particularly on heavily loaded systems. 4015 // 4016 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4017 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4018 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4019 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4020 // thread. 4021 // 4022 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4023 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4024 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4025 // This also works well. In fact it avoids kernel-level scalability impediments 4026 // on certain platforms that don't handle lots of active pthread_cond_timedwait() 4027 // timers in a graceful fashion. 4028 // 4029 // 4. When the abstime value is in the past it appears that control returns 4030 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4031 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4032 // can avoid the problem by reinitializing the condvar -- by cond_destroy() 4033 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4034 // It may be possible to avoid reinitialization by checking the return 4035 // value from pthread_cond_timedwait(). In addition to reinitializing the 4036 // condvar we must establish the invariant that cond_signal() is only called 4037 // within critical sections protected by the adjunct mutex. This prevents 4038 // cond_signal() from "seeing" a condvar that's in the midst of being 4039 // reinitialized or that is corrupt. Sadly, this invariant obviates the 4040 // desirable signal-after-unlock optimization that avoids futile context switching. 4041 // 4042 // I'm also concerned that some versions of NTPL might allocate an auxilliary 4043 // structure when a condvar is used or initialized. cond_destroy() would 4044 // release the helper structure. Our reinitialize-after-timedwait fix 4045 // put excessive stress on malloc/free and locks protecting the c-heap. 4046 // 4047 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4048 // It may be possible to refine (4) by checking the kernel and NTPL verisons 4049 // and only enabling the work-around for vulnerable environments. 4050 4051 // utility to compute the abstime argument to timedwait: 4052 // millis is the relative timeout time 4053 // abstime will be the absolute timeout time 4054 // TODO: replace compute_abstime() with unpackTime() 4055 4056 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4057 if (millis < 0) millis = 0; 4058 struct timeval now; 4059 int status = gettimeofday(&now, NULL); 4060 assert(status == 0, "gettimeofday"); 4061 jlong seconds = millis / 1000; 4062 millis %= 1000; 4063 if (seconds > 50000000) { // see man cond_timedwait(3T) 4064 seconds = 50000000; 4065 } 4066 abstime->tv_sec = now.tv_sec + seconds; 4067 long usec = now.tv_usec + millis * 1000; 4068 if (usec >= 1000000) { 4069 abstime->tv_sec += 1; 4070 usec -= 1000000; 4071 } 4072 abstime->tv_nsec = usec * 1000; 4073 return abstime; 4074 } 4075 4076 4077 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4078 // Conceptually TryPark() should be equivalent to park(0). 4079 4080 int os::PlatformEvent::TryPark() { 4081 for (;;) { 4082 const int v = _Event ; 4083 guarantee ((v == 0) || (v == 1), "invariant") ; 4084 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4085 } 4086 } 4087 4088 void os::PlatformEvent::park() { // AKA "down()" 4089 // Invariant: Only the thread associated with the Event/PlatformEvent 4090 // may call park(). 4091 // TODO: assert that _Assoc != NULL or _Assoc == Self 4092 int v ; 4093 for (;;) { 4094 v = _Event ; 4095 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4096 } 4097 guarantee (v >= 0, "invariant") ; 4098 if (v == 0) { 4099 // Do this the hard way by blocking ... 4100 int status = pthread_mutex_lock(_mutex); 4101 assert_status(status == 0, status, "mutex_lock"); 4102 guarantee (_nParked == 0, "invariant") ; 4103 ++ _nParked ; 4104 while (_Event < 0) { 4105 status = pthread_cond_wait(_cond, _mutex); 4106 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4107 // Treat this the same as if the wait was interrupted 4108 if (status == ETIMEDOUT) { status = EINTR; } 4109 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4110 } 4111 -- _nParked ; 4112 4113 _Event = 0 ; 4114 status = pthread_mutex_unlock(_mutex); 4115 assert_status(status == 0, status, "mutex_unlock"); 4116 // Paranoia to ensure our locked and lock-free paths interact 4117 // correctly with each other. 4118 OrderAccess::fence(); 4119 } 4120 guarantee (_Event >= 0, "invariant") ; 4121 } 4122 4123 int os::PlatformEvent::park(jlong millis) { 4124 guarantee (_nParked == 0, "invariant") ; 4125 4126 int v ; 4127 for (;;) { 4128 v = _Event ; 4129 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4130 } 4131 guarantee (v >= 0, "invariant") ; 4132 if (v != 0) return OS_OK ; 4133 4134 // We do this the hard way, by blocking the thread. 4135 // Consider enforcing a minimum timeout value. 4136 struct timespec abst; 4137 compute_abstime(&abst, millis); 4138 4139 int ret = OS_TIMEOUT; 4140 int status = pthread_mutex_lock(_mutex); 4141 assert_status(status == 0, status, "mutex_lock"); 4142 guarantee (_nParked == 0, "invariant") ; 4143 ++_nParked ; 4144 4145 // Object.wait(timo) will return because of 4146 // (a) notification 4147 // (b) timeout 4148 // (c) thread.interrupt 4149 // 4150 // Thread.interrupt and object.notify{All} both call Event::set. 4151 // That is, we treat thread.interrupt as a special case of notification. 4152 // The underlying Solaris implementation, cond_timedwait, admits 4153 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4154 // JVM from making those visible to Java code. As such, we must 4155 // filter out spurious wakeups. We assume all ETIME returns are valid. 4156 // 4157 // TODO: properly differentiate simultaneous notify+interrupt. 4158 // In that case, we should propagate the notify to another waiter. 4159 4160 while (_Event < 0) { 4161 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4162 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4163 pthread_cond_destroy (_cond); 4164 pthread_cond_init (_cond, NULL) ; 4165 } 4166 assert_status(status == 0 || status == EINTR || 4167 status == ETIMEDOUT, 4168 status, "cond_timedwait"); 4169 if (!FilterSpuriousWakeups) break ; // previous semantics 4170 if (status == ETIMEDOUT) break ; 4171 // We consume and ignore EINTR and spurious wakeups. 4172 } 4173 --_nParked ; 4174 if (_Event >= 0) { 4175 ret = OS_OK; 4176 } 4177 _Event = 0 ; 4178 status = pthread_mutex_unlock(_mutex); 4179 assert_status(status == 0, status, "mutex_unlock"); 4180 assert (_nParked == 0, "invariant") ; 4181 // Paranoia to ensure our locked and lock-free paths interact 4182 // correctly with each other. 4183 OrderAccess::fence(); 4184 return ret; 4185 } 4186 4187 void os::PlatformEvent::unpark() { 4188 // Transitions for _Event: 4189 // 0 :=> 1 4190 // 1 :=> 1 4191 // -1 :=> either 0 or 1; must signal target thread 4192 // That is, we can safely transition _Event from -1 to either 4193 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4194 // unpark() calls. 4195 // See also: "Semaphores in Plan 9" by Mullender & Cox 4196 // 4197 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4198 // that it will take two back-to-back park() calls for the owning 4199 // thread to block. This has the benefit of forcing a spurious return 4200 // from the first park() call after an unpark() call which will help 4201 // shake out uses of park() and unpark() without condition variables. 4202 4203 if (Atomic::xchg(1, &_Event) >= 0) return; 4204 4205 // Wait for the thread associated with the event to vacate 4206 int status = pthread_mutex_lock(_mutex); 4207 assert_status(status == 0, status, "mutex_lock"); 4208 int AnyWaiters = _nParked; 4209 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4210 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4211 AnyWaiters = 0; 4212 pthread_cond_signal(_cond); 4213 } 4214 status = pthread_mutex_unlock(_mutex); 4215 assert_status(status == 0, status, "mutex_unlock"); 4216 if (AnyWaiters != 0) { 4217 status = pthread_cond_signal(_cond); 4218 assert_status(status == 0, status, "cond_signal"); 4219 } 4220 4221 // Note that we signal() _after dropping the lock for "immortal" Events. 4222 // This is safe and avoids a common class of futile wakeups. In rare 4223 // circumstances this can cause a thread to return prematurely from 4224 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4225 // simply re-test the condition and re-park itself. 4226 } 4227 4228 4229 // JSR166 4230 // ------------------------------------------------------- 4231 4232 /* 4233 * The solaris and bsd implementations of park/unpark are fairly 4234 * conservative for now, but can be improved. They currently use a 4235 * mutex/condvar pair, plus a a count. 4236 * Park decrements count if > 0, else does a condvar wait. Unpark 4237 * sets count to 1 and signals condvar. Only one thread ever waits 4238 * on the condvar. Contention seen when trying to park implies that someone 4239 * is unparking you, so don't wait. And spurious returns are fine, so there 4240 * is no need to track notifications. 4241 */ 4242 4243 #define MAX_SECS 100000000 4244 /* 4245 * This code is common to bsd and solaris and will be moved to a 4246 * common place in dolphin. 4247 * 4248 * The passed in time value is either a relative time in nanoseconds 4249 * or an absolute time in milliseconds. Either way it has to be unpacked 4250 * into suitable seconds and nanoseconds components and stored in the 4251 * given timespec structure. 4252 * Given time is a 64-bit value and the time_t used in the timespec is only 4253 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4254 * overflow if times way in the future are given. Further on Solaris versions 4255 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4256 * number of seconds, in abstime, is less than current_time + 100,000,000. 4257 * As it will be 28 years before "now + 100000000" will overflow we can 4258 * ignore overflow and just impose a hard-limit on seconds using the value 4259 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4260 * years from "now". 4261 */ 4262 4263 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4264 assert (time > 0, "convertTime"); 4265 4266 struct timeval now; 4267 int status = gettimeofday(&now, NULL); 4268 assert(status == 0, "gettimeofday"); 4269 4270 time_t max_secs = now.tv_sec + MAX_SECS; 4271 4272 if (isAbsolute) { 4273 jlong secs = time / 1000; 4274 if (secs > max_secs) { 4275 absTime->tv_sec = max_secs; 4276 } 4277 else { 4278 absTime->tv_sec = secs; 4279 } 4280 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4281 } 4282 else { 4283 jlong secs = time / NANOSECS_PER_SEC; 4284 if (secs >= MAX_SECS) { 4285 absTime->tv_sec = max_secs; 4286 absTime->tv_nsec = 0; 4287 } 4288 else { 4289 absTime->tv_sec = now.tv_sec + secs; 4290 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4291 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4292 absTime->tv_nsec -= NANOSECS_PER_SEC; 4293 ++absTime->tv_sec; // note: this must be <= max_secs 4294 } 4295 } 4296 } 4297 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4298 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4299 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4300 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4301 } 4302 4303 void Parker::park(bool isAbsolute, jlong time) { 4304 // Ideally we'd do something useful while spinning, such 4305 // as calling unpackTime(). 4306 4307 // Optional fast-path check: 4308 // Return immediately if a permit is available. 4309 // We depend on Atomic::xchg() having full barrier semantics 4310 // since we are doing a lock-free update to _counter. 4311 if (Atomic::xchg(0, &_counter) > 0) return; 4312 4313 Thread* thread = Thread::current(); 4314 assert(thread->is_Java_thread(), "Must be JavaThread"); 4315 JavaThread *jt = (JavaThread *)thread; 4316 4317 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4318 // Check interrupt before trying to wait 4319 if (Thread::is_interrupted(thread, false)) { 4320 return; 4321 } 4322 4323 // Next, demultiplex/decode time arguments 4324 struct timespec absTime; 4325 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4326 return; 4327 } 4328 if (time > 0) { 4329 unpackTime(&absTime, isAbsolute, time); 4330 } 4331 4332 4333 // Enter safepoint region 4334 // Beware of deadlocks such as 6317397. 4335 // The per-thread Parker:: mutex is a classic leaf-lock. 4336 // In particular a thread must never block on the Threads_lock while 4337 // holding the Parker:: mutex. If safepoints are pending both the 4338 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4339 ThreadBlockInVM tbivm(jt); 4340 4341 // Don't wait if cannot get lock since interference arises from 4342 // unblocking. Also. check interrupt before trying wait 4343 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4344 return; 4345 } 4346 4347 int status ; 4348 if (_counter > 0) { // no wait needed 4349 _counter = 0; 4350 status = pthread_mutex_unlock(_mutex); 4351 assert (status == 0, "invariant") ; 4352 // Paranoia to ensure our locked and lock-free paths interact 4353 // correctly with each other and Java-level accesses. 4354 OrderAccess::fence(); 4355 return; 4356 } 4357 4358 #ifdef ASSERT 4359 // Don't catch signals while blocked; let the running threads have the signals. 4360 // (This allows a debugger to break into the running thread.) 4361 sigset_t oldsigs; 4362 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4363 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4364 #endif 4365 4366 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4367 jt->set_suspend_equivalent(); 4368 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4369 4370 if (time == 0) { 4371 status = pthread_cond_wait (_cond, _mutex) ; 4372 } else { 4373 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4374 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4375 pthread_cond_destroy (_cond) ; 4376 pthread_cond_init (_cond, NULL); 4377 } 4378 } 4379 assert_status(status == 0 || status == EINTR || 4380 status == ETIMEDOUT, 4381 status, "cond_timedwait"); 4382 4383 #ifdef ASSERT 4384 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4385 #endif 4386 4387 _counter = 0 ; 4388 status = pthread_mutex_unlock(_mutex) ; 4389 assert_status(status == 0, status, "invariant") ; 4390 // Paranoia to ensure our locked and lock-free paths interact 4391 // correctly with each other and Java-level accesses. 4392 OrderAccess::fence(); 4393 4394 // If externally suspended while waiting, re-suspend 4395 if (jt->handle_special_suspend_equivalent_condition()) { 4396 jt->java_suspend_self(); 4397 } 4398 } 4399 4400 void Parker::unpark() { 4401 int s, status ; 4402 status = pthread_mutex_lock(_mutex); 4403 assert (status == 0, "invariant") ; 4404 s = _counter; 4405 _counter = 1; 4406 if (s < 1) { 4407 if (WorkAroundNPTLTimedWaitHang) { 4408 status = pthread_cond_signal (_cond) ; 4409 assert (status == 0, "invariant") ; 4410 status = pthread_mutex_unlock(_mutex); 4411 assert (status == 0, "invariant") ; 4412 } else { 4413 status = pthread_mutex_unlock(_mutex); 4414 assert (status == 0, "invariant") ; 4415 status = pthread_cond_signal (_cond) ; 4416 assert (status == 0, "invariant") ; 4417 } 4418 } else { 4419 pthread_mutex_unlock(_mutex); 4420 assert (status == 0, "invariant") ; 4421 } 4422 } 4423 4424 4425 /* Darwin has no "environ" in a dynamic library. */ 4426 #ifdef __APPLE__ 4427 #include <crt_externs.h> 4428 #define environ (*_NSGetEnviron()) 4429 #else 4430 extern char** environ; 4431 #endif 4432 4433 // Run the specified command in a separate process. Return its exit value, 4434 // or -1 on failure (e.g. can't fork a new process). 4435 // Unlike system(), this function can be called from signal handler. It 4436 // doesn't block SIGINT et al. 4437 int os::fork_and_exec(char* cmd) { 4438 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4439 4440 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4441 // pthread_atfork handlers and reset pthread library. All we need is a 4442 // separate process to execve. Make a direct syscall to fork process. 4443 // On IA64 there's no fork syscall, we have to use fork() and hope for 4444 // the best... 4445 pid_t pid = fork(); 4446 4447 if (pid < 0) { 4448 // fork failed 4449 return -1; 4450 4451 } else if (pid == 0) { 4452 // child process 4453 4454 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4455 // first to kill every thread on the thread list. Because this list is 4456 // not reset by fork() (see notes above), execve() will instead kill 4457 // every thread in the parent process. We know this is the only thread 4458 // in the new process, so make a system call directly. 4459 // IA64 should use normal execve() from glibc to match the glibc fork() 4460 // above. 4461 execve("/bin/sh", (char* const*)argv, environ); 4462 4463 // execve failed 4464 _exit(-1); 4465 4466 } else { 4467 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4468 // care about the actual exit code, for now. 4469 4470 int status; 4471 4472 // Wait for the child process to exit. This returns immediately if 4473 // the child has already exited. */ 4474 while (waitpid(pid, &status, 0) < 0) { 4475 switch (errno) { 4476 case ECHILD: return 0; 4477 case EINTR: break; 4478 default: return -1; 4479 } 4480 } 4481 4482 if (WIFEXITED(status)) { 4483 // The child exited normally; get its exit code. 4484 return WEXITSTATUS(status); 4485 } else if (WIFSIGNALED(status)) { 4486 // The child exited because of a signal 4487 // The best value to return is 0x80 + signal number, 4488 // because that is what all Unix shells do, and because 4489 // it allows callers to distinguish between process exit and 4490 // process death by signal. 4491 return 0x80 + WTERMSIG(status); 4492 } else { 4493 // Unknown exit code; pass it through 4494 return status; 4495 } 4496 } 4497 } 4498 4499 // is_headless_jre() 4500 // 4501 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4502 // in order to report if we are running in a headless jre 4503 // 4504 // Since JDK8 xawt/libmawt.so was moved into the same directory 4505 // as libawt.so, and renamed libawt_xawt.so 4506 // 4507 bool os::is_headless_jre() { 4508 struct stat statbuf; 4509 char buf[MAXPATHLEN]; 4510 char libmawtpath[MAXPATHLEN]; 4511 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4512 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4513 char *p; 4514 4515 // Get path to libjvm.so 4516 os::jvm_path(buf, sizeof(buf)); 4517 4518 // Get rid of libjvm.so 4519 p = strrchr(buf, '/'); 4520 if (p == NULL) return false; 4521 else *p = '\0'; 4522 4523 // Get rid of client or server 4524 p = strrchr(buf, '/'); 4525 if (p == NULL) return false; 4526 else *p = '\0'; 4527 4528 // check xawt/libmawt.so 4529 strcpy(libmawtpath, buf); 4530 strcat(libmawtpath, xawtstr); 4531 if (::stat(libmawtpath, &statbuf) == 0) return false; 4532 4533 // check libawt_xawt.so 4534 strcpy(libmawtpath, buf); 4535 strcat(libmawtpath, new_xawtstr); 4536 if (::stat(libmawtpath, &statbuf) == 0) return false; 4537 4538 return true; 4539 } 4540 4541 // Get the default path to the core file 4542 // Returns the length of the string 4543 int os::get_core_path(char* buffer, size_t bufferSize) { 4544 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4545 4546 // Truncate if theoretical string was longer than bufferSize 4547 n = MIN2(n, (int)bufferSize); 4548 4549 return n; 4550 }