1 /* 2 * Copyright (c) 1999, 2019, 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 "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logStream.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/filemap.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "os_bsd.inline.hpp" 41 #include "os_posix.inline.hpp" 42 #include "os_share_bsd.hpp" 43 #include "prims/jniFastGetField.hpp" 44 #include "prims/jvm_misc.hpp" 45 #include "runtime/arguments.hpp" 46 #include "runtime/atomic.hpp" 47 #include "runtime/extendedPC.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/interfaceSupport.inline.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/mutexLocker.hpp" 53 #include "runtime/objectMonitor.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.hpp" 56 #include "runtime/semaphore.hpp" 57 #include "runtime/sharedRuntime.hpp" 58 #include "runtime/statSampler.hpp" 59 #include "runtime/stubRoutines.hpp" 60 #include "runtime/thread.inline.hpp" 61 #include "runtime/threadCritical.hpp" 62 #include "runtime/timer.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/memTracker.hpp" 65 #include "services/runtimeService.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/vmError.hpp" 72 73 // put OS-includes here 74 # include <dlfcn.h> 75 # include <errno.h> 76 # include <fcntl.h> 77 # include <inttypes.h> 78 # include <poll.h> 79 # include <pthread.h> 80 # include <pwd.h> 81 # include <signal.h> 82 # include <stdint.h> 83 # include <stdio.h> 84 # include <string.h> 85 # include <sys/ioctl.h> 86 # include <sys/mman.h> 87 # include <sys/param.h> 88 # include <sys/resource.h> 89 # include <sys/socket.h> 90 # include <sys/stat.h> 91 # include <sys/syscall.h> 92 # include <sys/sysctl.h> 93 # include <sys/time.h> 94 # include <sys/times.h> 95 # include <sys/types.h> 96 # include <sys/wait.h> 97 # include <time.h> 98 # include <unistd.h> 99 100 #if defined(__FreeBSD__) || defined(__NetBSD__) 101 #include <elf.h> 102 #endif 103 104 #ifdef __APPLE__ 105 #include <mach-o/dyld.h> 106 #endif 107 108 #ifndef MAP_ANONYMOUS 109 #define MAP_ANONYMOUS MAP_ANON 110 #endif 111 112 #define MAX_PATH (2 * K) 113 114 // for timer info max values which include all bits 115 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 116 117 //////////////////////////////////////////////////////////////////////////////// 118 // global variables 119 julong os::Bsd::_physical_memory = 0; 120 121 #ifdef __APPLE__ 122 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; 123 volatile uint64_t os::Bsd::_max_abstime = 0; 124 #else 125 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 126 #endif 127 pthread_t os::Bsd::_main_thread; 128 int os::Bsd::_page_size = -1; 129 130 static jlong initial_time_count=0; 131 132 static int clock_tics_per_sec = 100; 133 134 // For diagnostics to print a message once. see run_periodic_checks 135 static sigset_t check_signal_done; 136 static bool check_signals = true; 137 138 // Signal number used to suspend/resume a thread 139 140 // do not use any signal number less than SIGSEGV, see 4355769 141 static int SR_signum = SIGUSR2; 142 sigset_t SR_sigset; 143 144 145 //////////////////////////////////////////////////////////////////////////////// 146 // utility functions 147 148 static int SR_initialize(); 149 150 julong os::available_memory() { 151 return Bsd::available_memory(); 152 } 153 154 // available here means free 155 julong os::Bsd::available_memory() { 156 uint64_t available = physical_memory() >> 2; 157 #ifdef __APPLE__ 158 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; 159 vm_statistics64_data_t vmstat; 160 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, 161 (host_info64_t)&vmstat, &count); 162 assert(kerr == KERN_SUCCESS, 163 "host_statistics64 failed - check mach_host_self() and count"); 164 if (kerr == KERN_SUCCESS) { 165 available = vmstat.free_count * os::vm_page_size(); 166 } 167 #endif 168 return available; 169 } 170 171 // for more info see : 172 // https://man.openbsd.org/sysctl.2 173 void os::Bsd::print_uptime_info(outputStream* st) { 174 struct timeval boottime; 175 size_t len = sizeof(boottime); 176 int mib[2]; 177 mib[0] = CTL_KERN; 178 mib[1] = KERN_BOOTTIME; 179 180 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) { 181 time_t bootsec = boottime.tv_sec; 182 time_t currsec = time(NULL); 183 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec)); 184 } 185 } 186 187 julong os::physical_memory() { 188 return Bsd::physical_memory(); 189 } 190 191 // Return true if user is running as root. 192 193 bool os::have_special_privileges() { 194 static bool init = false; 195 static bool privileges = false; 196 if (!init) { 197 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 198 init = true; 199 } 200 return privileges; 201 } 202 203 204 205 // Cpu architecture string 206 #if defined(ZERO) 207 static char cpu_arch[] = ZERO_LIBARCH; 208 #elif defined(IA64) 209 static char cpu_arch[] = "ia64"; 210 #elif defined(IA32) 211 static char cpu_arch[] = "i386"; 212 #elif defined(AMD64) 213 static char cpu_arch[] = "amd64"; 214 #elif defined(ARM) 215 static char cpu_arch[] = "arm"; 216 #elif defined(PPC32) 217 static char cpu_arch[] = "ppc"; 218 #elif defined(SPARC) 219 #ifdef _LP64 220 static char cpu_arch[] = "sparcv9"; 221 #else 222 static char cpu_arch[] = "sparc"; 223 #endif 224 #else 225 #error Add appropriate cpu_arch setting 226 #endif 227 228 // Compiler variant 229 #ifdef COMPILER2 230 #define COMPILER_VARIANT "server" 231 #else 232 #define COMPILER_VARIANT "client" 233 #endif 234 235 236 void os::Bsd::initialize_system_info() { 237 int mib[2]; 238 size_t len; 239 int cpu_val; 240 julong mem_val; 241 242 // get processors count via hw.ncpus sysctl 243 mib[0] = CTL_HW; 244 mib[1] = HW_NCPU; 245 len = sizeof(cpu_val); 246 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 247 assert(len == sizeof(cpu_val), "unexpected data size"); 248 set_processor_count(cpu_val); 249 } else { 250 set_processor_count(1); // fallback 251 } 252 253 // get physical memory via hw.memsize sysctl (hw.memsize is used 254 // since it returns a 64 bit value) 255 mib[0] = CTL_HW; 256 257 #if defined (HW_MEMSIZE) // Apple 258 mib[1] = HW_MEMSIZE; 259 #elif defined(HW_PHYSMEM) // Most of BSD 260 mib[1] = HW_PHYSMEM; 261 #elif defined(HW_REALMEM) // Old FreeBSD 262 mib[1] = HW_REALMEM; 263 #else 264 #error No ways to get physmem 265 #endif 266 267 len = sizeof(mem_val); 268 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 269 assert(len == sizeof(mem_val), "unexpected data size"); 270 _physical_memory = mem_val; 271 } else { 272 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?) 273 } 274 275 #ifdef __OpenBSD__ 276 { 277 // limit _physical_memory memory view on OpenBSD since 278 // datasize rlimit restricts us anyway. 279 struct rlimit limits; 280 getrlimit(RLIMIT_DATA, &limits); 281 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 282 } 283 #endif 284 } 285 286 #ifdef __APPLE__ 287 static const char *get_home() { 288 const char *home_dir = ::getenv("HOME"); 289 if ((home_dir == NULL) || (*home_dir == '\0')) { 290 struct passwd *passwd_info = getpwuid(geteuid()); 291 if (passwd_info != NULL) { 292 home_dir = passwd_info->pw_dir; 293 } 294 } 295 296 return home_dir; 297 } 298 #endif 299 300 void os::init_system_properties_values() { 301 // The next steps are taken in the product version: 302 // 303 // Obtain the JAVA_HOME value from the location of libjvm.so. 304 // This library should be located at: 305 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 306 // 307 // If "/jre/lib/" appears at the right place in the path, then we 308 // assume libjvm.so is installed in a JDK and we use this path. 309 // 310 // Otherwise exit with message: "Could not create the Java virtual machine." 311 // 312 // The following extra steps are taken in the debugging version: 313 // 314 // If "/jre/lib/" does NOT appear at the right place in the path 315 // instead of exit check for $JAVA_HOME environment variable. 316 // 317 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 318 // then we append a fake suffix "hotspot/libjvm.so" to this path so 319 // it looks like libjvm.so is installed there 320 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 321 // 322 // Otherwise exit. 323 // 324 // Important note: if the location of libjvm.so changes this 325 // code needs to be changed accordingly. 326 327 // See ld(1): 328 // The linker uses the following search paths to locate required 329 // shared libraries: 330 // 1: ... 331 // ... 332 // 7: The default directories, normally /lib and /usr/lib. 333 #ifndef DEFAULT_LIBPATH 334 #ifndef OVERRIDE_LIBPATH 335 #define DEFAULT_LIBPATH "/lib:/usr/lib" 336 #else 337 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH 338 #endif 339 #endif 340 341 // Base path of extensions installed on the system. 342 #define SYS_EXT_DIR "/usr/java/packages" 343 #define EXTENSIONS_DIR "/lib/ext" 344 345 #ifndef __APPLE__ 346 347 // Buffer that fits several sprintfs. 348 // Note that the space for the colon and the trailing null are provided 349 // by the nulls included by the sizeof operator. 350 const size_t bufsize = 351 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 352 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 353 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 354 355 // sysclasspath, java_home, dll_dir 356 { 357 char *pslash; 358 os::jvm_path(buf, bufsize); 359 360 // Found the full path to libjvm.so. 361 // Now cut the path to <java_home>/jre if we can. 362 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 363 pslash = strrchr(buf, '/'); 364 if (pslash != NULL) { 365 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 366 } 367 Arguments::set_dll_dir(buf); 368 369 if (pslash != NULL) { 370 pslash = strrchr(buf, '/'); 371 if (pslash != NULL) { 372 *pslash = '\0'; // Get rid of /<arch>. 373 pslash = strrchr(buf, '/'); 374 if (pslash != NULL) { 375 *pslash = '\0'; // Get rid of /lib. 376 } 377 } 378 } 379 Arguments::set_java_home(buf); 380 if (!set_boot_path('/', ':')) { 381 vm_exit_during_initialization("Failed setting boot class path.", NULL); 382 } 383 } 384 385 // Where to look for native libraries. 386 // 387 // Note: Due to a legacy implementation, most of the library path 388 // is set in the launcher. This was to accomodate linking restrictions 389 // on legacy Bsd implementations (which are no longer supported). 390 // Eventually, all the library path setting will be done here. 391 // 392 // However, to prevent the proliferation of improperly built native 393 // libraries, the new path component /usr/java/packages is added here. 394 // Eventually, all the library path setting will be done here. 395 { 396 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 397 // should always exist (until the legacy problem cited above is 398 // addressed). 399 const char *v = ::getenv("LD_LIBRARY_PATH"); 400 const char *v_colon = ":"; 401 if (v == NULL) { v = ""; v_colon = ""; } 402 // That's +1 for the colon and +1 for the trailing '\0'. 403 char *ld_library_path = NEW_C_HEAP_ARRAY(char, 404 strlen(v) + 1 + 405 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, 406 mtInternal); 407 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); 408 Arguments::set_library_path(ld_library_path); 409 FREE_C_HEAP_ARRAY(char, ld_library_path); 410 } 411 412 // Extensions directories. 413 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 414 Arguments::set_ext_dirs(buf); 415 416 FREE_C_HEAP_ARRAY(char, buf); 417 418 #else // __APPLE__ 419 420 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 421 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 422 423 const char *user_home_dir = get_home(); 424 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. 425 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 426 sizeof(SYS_EXTENSIONS_DIRS); 427 428 // Buffer that fits several sprintfs. 429 // Note that the space for the colon and the trailing null are provided 430 // by the nulls included by the sizeof operator. 431 const size_t bufsize = 432 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends. 433 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir 434 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 435 436 // sysclasspath, java_home, dll_dir 437 { 438 char *pslash; 439 os::jvm_path(buf, bufsize); 440 441 // Found the full path to libjvm.so. 442 // Now cut the path to <java_home>/jre if we can. 443 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 444 pslash = strrchr(buf, '/'); 445 if (pslash != NULL) { 446 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 447 } 448 #ifdef STATIC_BUILD 449 strcat(buf, "/lib"); 450 #endif 451 452 Arguments::set_dll_dir(buf); 453 454 if (pslash != NULL) { 455 pslash = strrchr(buf, '/'); 456 if (pslash != NULL) { 457 *pslash = '\0'; // Get rid of /lib. 458 } 459 } 460 Arguments::set_java_home(buf); 461 set_boot_path('/', ':'); 462 } 463 464 // Where to look for native libraries. 465 // 466 // Note: Due to a legacy implementation, most of the library path 467 // is set in the launcher. This was to accomodate linking restrictions 468 // on legacy Bsd implementations (which are no longer supported). 469 // Eventually, all the library path setting will be done here. 470 // 471 // However, to prevent the proliferation of improperly built native 472 // libraries, the new path component /usr/java/packages is added here. 473 // Eventually, all the library path setting will be done here. 474 { 475 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 476 // should always exist (until the legacy problem cited above is 477 // addressed). 478 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code 479 // can specify a directory inside an app wrapper 480 const char *l = ::getenv("JAVA_LIBRARY_PATH"); 481 const char *l_colon = ":"; 482 if (l == NULL) { l = ""; l_colon = ""; } 483 484 const char *v = ::getenv("DYLD_LIBRARY_PATH"); 485 const char *v_colon = ":"; 486 if (v == NULL) { v = ""; v_colon = ""; } 487 488 // Apple's Java6 has "." at the beginning of java.library.path. 489 // OpenJDK on Windows has "." at the end of java.library.path. 490 // OpenJDK on Linux and Solaris don't have "." in java.library.path 491 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 492 // "." is appended to the end of java.library.path. Yes, this 493 // could cause a change in behavior, but Apple's Java6 behavior 494 // can be achieved by putting "." at the beginning of the 495 // JAVA_LIBRARY_PATH environment variable. 496 char *ld_library_path = NEW_C_HEAP_ARRAY(char, 497 strlen(v) + 1 + strlen(l) + 1 + 498 system_ext_size + 3, 499 mtInternal); 500 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", 501 v, v_colon, l, l_colon, user_home_dir); 502 Arguments::set_library_path(ld_library_path); 503 FREE_C_HEAP_ARRAY(char, ld_library_path); 504 } 505 506 // Extensions directories. 507 // 508 // Note that the space for the colon and the trailing null are provided 509 // by the nulls included by the sizeof operator (so actually one byte more 510 // than necessary is allocated). 511 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, 512 user_home_dir, Arguments::get_java_home()); 513 Arguments::set_ext_dirs(buf); 514 515 FREE_C_HEAP_ARRAY(char, buf); 516 517 #undef SYS_EXTENSIONS_DIR 518 #undef SYS_EXTENSIONS_DIRS 519 520 #endif // __APPLE__ 521 522 #undef SYS_EXT_DIR 523 #undef EXTENSIONS_DIR 524 } 525 526 //////////////////////////////////////////////////////////////////////////////// 527 // breakpoint support 528 529 void os::breakpoint() { 530 BREAKPOINT; 531 } 532 533 extern "C" void breakpoint() { 534 // use debugger to set breakpoint here 535 } 536 537 //////////////////////////////////////////////////////////////////////////////// 538 // signal support 539 540 debug_only(static bool signal_sets_initialized = false); 541 static sigset_t unblocked_sigs, vm_sigs; 542 543 void os::Bsd::signal_sets_init() { 544 // Should also have an assertion stating we are still single-threaded. 545 assert(!signal_sets_initialized, "Already initialized"); 546 // Fill in signals that are necessarily unblocked for all threads in 547 // the VM. Currently, we unblock the following signals: 548 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 549 // by -Xrs (=ReduceSignalUsage)); 550 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 551 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 552 // the dispositions or masks wrt these signals. 553 // Programs embedding the VM that want to use the above signals for their 554 // own purposes must, at this time, use the "-Xrs" option to prevent 555 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 556 // (See bug 4345157, and other related bugs). 557 // In reality, though, unblocking these signals is really a nop, since 558 // these signals are not blocked by default. 559 sigemptyset(&unblocked_sigs); 560 sigaddset(&unblocked_sigs, SIGILL); 561 sigaddset(&unblocked_sigs, SIGSEGV); 562 sigaddset(&unblocked_sigs, SIGBUS); 563 sigaddset(&unblocked_sigs, SIGFPE); 564 sigaddset(&unblocked_sigs, SR_signum); 565 566 if (!ReduceSignalUsage) { 567 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 568 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 569 570 } 571 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 572 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 573 } 574 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 575 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 576 } 577 } 578 // Fill in signals that are blocked by all but the VM thread. 579 sigemptyset(&vm_sigs); 580 if (!ReduceSignalUsage) { 581 sigaddset(&vm_sigs, BREAK_SIGNAL); 582 } 583 debug_only(signal_sets_initialized = true); 584 585 } 586 587 // These are signals that are unblocked while a thread is running Java. 588 // (For some reason, they get blocked by default.) 589 sigset_t* os::Bsd::unblocked_signals() { 590 assert(signal_sets_initialized, "Not initialized"); 591 return &unblocked_sigs; 592 } 593 594 // These are the signals that are blocked while a (non-VM) thread is 595 // running Java. Only the VM thread handles these signals. 596 sigset_t* os::Bsd::vm_signals() { 597 assert(signal_sets_initialized, "Not initialized"); 598 return &vm_sigs; 599 } 600 601 void os::Bsd::hotspot_sigmask(Thread* thread) { 602 603 //Save caller's signal mask before setting VM signal mask 604 sigset_t caller_sigmask; 605 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 606 607 OSThread* osthread = thread->osthread(); 608 osthread->set_caller_sigmask(caller_sigmask); 609 610 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 611 612 if (!ReduceSignalUsage) { 613 if (thread->is_VM_thread()) { 614 // Only the VM thread handles BREAK_SIGNAL ... 615 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 616 } else { 617 // ... all other threads block BREAK_SIGNAL 618 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 619 } 620 } 621 } 622 623 624 ////////////////////////////////////////////////////////////////////////////// 625 // create new thread 626 627 #ifdef __APPLE__ 628 // library handle for calling objc_registerThreadWithCollector() 629 // without static linking to the libobjc library 630 #define OBJC_LIB "/usr/lib/libobjc.dylib" 631 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 632 typedef void (*objc_registerThreadWithCollector_t)(); 633 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 634 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 635 #endif 636 637 #ifdef __APPLE__ 638 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 639 // Additional thread_id used to correlate threads in SA 640 thread_identifier_info_data_t m_ident_info; 641 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 642 643 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 644 (thread_info_t) &m_ident_info, &count); 645 646 return m_ident_info.thread_id; 647 } 648 #endif 649 650 // Thread start routine for all newly created threads 651 static void *thread_native_entry(Thread *thread) { 652 653 thread->record_stack_base_and_size(); 654 655 // Try to randomize the cache line index of hot stack frames. 656 // This helps when threads of the same stack traces evict each other's 657 // cache lines. The threads can be either from the same JVM instance, or 658 // from different JVM instances. The benefit is especially true for 659 // processors with hyperthreading technology. 660 static int counter = 0; 661 int pid = os::current_process_id(); 662 alloca(((pid ^ counter++) & 7) * 128); 663 664 thread->initialize_thread_current(); 665 666 OSThread* osthread = thread->osthread(); 667 Monitor* sync = osthread->startThread_lock(); 668 669 osthread->set_thread_id(os::Bsd::gettid()); 670 671 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 672 os::current_thread_id(), (uintx) pthread_self()); 673 674 #ifdef __APPLE__ 675 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 676 guarantee(unique_thread_id != 0, "unique thread id was not found"); 677 osthread->set_unique_thread_id(unique_thread_id); 678 #endif 679 // initialize signal mask for this thread 680 os::Bsd::hotspot_sigmask(thread); 681 682 // initialize floating point control register 683 os::Bsd::init_thread_fpu_state(); 684 685 #ifdef __APPLE__ 686 // register thread with objc gc 687 if (objc_registerThreadWithCollectorFunction != NULL) { 688 objc_registerThreadWithCollectorFunction(); 689 } 690 #endif 691 692 // handshaking with parent thread 693 { 694 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag); 695 696 // notify parent thread 697 osthread->set_state(INITIALIZED); 698 sync->notify_all(); 699 700 // wait until os::start_thread() 701 while (osthread->get_state() == INITIALIZED) { 702 sync->wait_without_safepoint_check(); 703 } 704 } 705 706 // call one more level start routine 707 thread->call_run(); 708 709 // Note: at this point the thread object may already have deleted itself. 710 // Prevent dereferencing it from here on out. 711 thread = NULL; 712 713 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 714 os::current_thread_id(), (uintx) pthread_self()); 715 716 return 0; 717 } 718 719 bool os::create_thread(Thread* thread, ThreadType thr_type, 720 size_t req_stack_size) { 721 assert(thread->osthread() == NULL, "caller responsible"); 722 723 // Allocate the OSThread object 724 OSThread* osthread = new OSThread(NULL, NULL); 725 if (osthread == NULL) { 726 return false; 727 } 728 729 // set the correct thread state 730 osthread->set_thread_type(thr_type); 731 732 // Initial state is ALLOCATED but not INITIALIZED 733 osthread->set_state(ALLOCATED); 734 735 thread->set_osthread(osthread); 736 737 // init thread attributes 738 pthread_attr_t attr; 739 pthread_attr_init(&attr); 740 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 741 742 // calculate stack size if it's not specified by caller 743 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 744 int status = pthread_attr_setstacksize(&attr, stack_size); 745 assert_status(status == 0, status, "pthread_attr_setstacksize"); 746 747 ThreadState state; 748 749 { 750 pthread_t tid; 751 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 752 753 char buf[64]; 754 if (ret == 0) { 755 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 756 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 757 } else { 758 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 759 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 760 // Log some OS information which might explain why creating the thread failed. 761 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 762 LogStream st(Log(os, thread)::info()); 763 os::Posix::print_rlimit_info(&st); 764 os::print_memory_info(&st); 765 } 766 767 pthread_attr_destroy(&attr); 768 769 if (ret != 0) { 770 // Need to clean up stuff we've allocated so far 771 thread->set_osthread(NULL); 772 delete osthread; 773 return false; 774 } 775 776 // Store pthread info into the OSThread 777 osthread->set_pthread_id(tid); 778 779 // Wait until child thread is either initialized or aborted 780 { 781 Monitor* sync_with_child = osthread->startThread_lock(); 782 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag); 783 while ((state = osthread->get_state()) == ALLOCATED) { 784 sync_with_child->wait_without_safepoint_check(); 785 } 786 } 787 788 } 789 790 // Aborted due to thread limit being reached 791 if (state == ZOMBIE) { 792 thread->set_osthread(NULL); 793 delete osthread; 794 return false; 795 } 796 797 // The thread is returned suspended (in state INITIALIZED), 798 // and is started higher up in the call chain 799 assert(state == INITIALIZED, "race condition"); 800 return true; 801 } 802 803 ///////////////////////////////////////////////////////////////////////////// 804 // attach existing thread 805 806 // bootstrap the main thread 807 bool os::create_main_thread(JavaThread* thread) { 808 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 809 return create_attached_thread(thread); 810 } 811 812 bool os::create_attached_thread(JavaThread* thread) { 813 #ifdef ASSERT 814 thread->verify_not_published(); 815 #endif 816 817 // Allocate the OSThread object 818 OSThread* osthread = new OSThread(NULL, NULL); 819 820 if (osthread == NULL) { 821 return false; 822 } 823 824 osthread->set_thread_id(os::Bsd::gettid()); 825 826 // Store pthread info into the OSThread 827 #ifdef __APPLE__ 828 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 829 guarantee(unique_thread_id != 0, "just checking"); 830 osthread->set_unique_thread_id(unique_thread_id); 831 #endif 832 osthread->set_pthread_id(::pthread_self()); 833 834 // initialize floating point control register 835 os::Bsd::init_thread_fpu_state(); 836 837 // Initial thread state is RUNNABLE 838 osthread->set_state(RUNNABLE); 839 840 thread->set_osthread(osthread); 841 842 // initialize signal mask for this thread 843 // and save the caller's signal mask 844 os::Bsd::hotspot_sigmask(thread); 845 846 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 847 os::current_thread_id(), (uintx) pthread_self()); 848 849 return true; 850 } 851 852 void os::pd_start_thread(Thread* thread) { 853 OSThread * osthread = thread->osthread(); 854 assert(osthread->get_state() != INITIALIZED, "just checking"); 855 Monitor* sync_with_child = osthread->startThread_lock(); 856 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag); 857 sync_with_child->notify(); 858 } 859 860 // Free Bsd resources related to the OSThread 861 void os::free_thread(OSThread* osthread) { 862 assert(osthread != NULL, "osthread not set"); 863 864 // We are told to free resources of the argument thread, 865 // but we can only really operate on the current thread. 866 assert(Thread::current()->osthread() == osthread, 867 "os::free_thread but not current thread"); 868 869 // Restore caller's signal mask 870 sigset_t sigmask = osthread->caller_sigmask(); 871 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 872 873 delete osthread; 874 } 875 876 //////////////////////////////////////////////////////////////////////////////// 877 // time support 878 879 // Time since start-up in seconds to a fine granularity. 880 // Used by VMSelfDestructTimer and the MemProfiler. 881 double os::elapsedTime() { 882 883 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 884 } 885 886 jlong os::elapsed_counter() { 887 return javaTimeNanos() - initial_time_count; 888 } 889 890 jlong os::elapsed_frequency() { 891 return NANOSECS_PER_SEC; // nanosecond resolution 892 } 893 894 bool os::supports_vtime() { return true; } 895 896 double os::elapsedVTime() { 897 // better than nothing, but not much 898 return elapsedTime(); 899 } 900 901 jlong os::javaTimeMillis() { 902 timeval time; 903 int status = gettimeofday(&time, NULL); 904 assert(status != -1, "bsd error"); 905 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 906 } 907 908 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 909 timeval time; 910 int status = gettimeofday(&time, NULL); 911 assert(status != -1, "bsd error"); 912 seconds = jlong(time.tv_sec); 913 nanos = jlong(time.tv_usec) * 1000; 914 } 915 916 #ifndef __APPLE__ 917 #ifndef CLOCK_MONOTONIC 918 #define CLOCK_MONOTONIC (1) 919 #endif 920 #endif 921 922 #ifdef __APPLE__ 923 void os::Bsd::clock_init() { 924 mach_timebase_info(&_timebase_info); 925 } 926 #else 927 void os::Bsd::clock_init() { 928 struct timespec res; 929 struct timespec tp; 930 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 931 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 932 // yes, monotonic clock is supported 933 _clock_gettime = ::clock_gettime; 934 } 935 } 936 #endif 937 938 939 940 #ifdef __APPLE__ 941 942 jlong os::javaTimeNanos() { 943 const uint64_t tm = mach_absolute_time(); 944 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 945 const uint64_t prev = Bsd::_max_abstime; 946 if (now <= prev) { 947 return prev; // same or retrograde time; 948 } 949 const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now); 950 assert(obsv >= prev, "invariant"); // Monotonicity 951 // If the CAS succeeded then we're done and return "now". 952 // If the CAS failed and the observed value "obsv" is >= now then 953 // we should return "obsv". If the CAS failed and now > obsv > prv then 954 // some other thread raced this thread and installed a new value, in which case 955 // we could either (a) retry the entire operation, (b) retry trying to install now 956 // or (c) just return obsv. We use (c). No loop is required although in some cases 957 // we might discard a higher "now" value in deference to a slightly lower but freshly 958 // installed obsv value. That's entirely benign -- it admits no new orderings compared 959 // to (a) or (b) -- and greatly reduces coherence traffic. 960 // We might also condition (c) on the magnitude of the delta between obsv and now. 961 // Avoiding excessive CAS operations to hot RW locations is critical. 962 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 963 return (prev == obsv) ? now : obsv; 964 } 965 966 #else // __APPLE__ 967 968 jlong os::javaTimeNanos() { 969 if (os::supports_monotonic_clock()) { 970 struct timespec tp; 971 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 972 assert(status == 0, "gettime error"); 973 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 974 return result; 975 } else { 976 timeval time; 977 int status = gettimeofday(&time, NULL); 978 assert(status != -1, "bsd error"); 979 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 980 return 1000 * usecs; 981 } 982 } 983 984 #endif // __APPLE__ 985 986 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 987 if (os::supports_monotonic_clock()) { 988 info_ptr->max_value = ALL_64_BITS; 989 990 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 991 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 992 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 993 } else { 994 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 995 info_ptr->max_value = ALL_64_BITS; 996 997 // gettimeofday is a real time clock so it skips 998 info_ptr->may_skip_backward = true; 999 info_ptr->may_skip_forward = true; 1000 } 1001 1002 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1003 } 1004 1005 // Return the real, user, and system times in seconds from an 1006 // arbitrary fixed point in the past. 1007 bool os::getTimesSecs(double* process_real_time, 1008 double* process_user_time, 1009 double* process_system_time) { 1010 struct tms ticks; 1011 clock_t real_ticks = times(&ticks); 1012 1013 if (real_ticks == (clock_t) (-1)) { 1014 return false; 1015 } else { 1016 double ticks_per_second = (double) clock_tics_per_sec; 1017 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1018 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1019 *process_real_time = ((double) real_ticks) / ticks_per_second; 1020 1021 return true; 1022 } 1023 } 1024 1025 1026 char * os::local_time_string(char *buf, size_t buflen) { 1027 struct tm t; 1028 time_t long_time; 1029 time(&long_time); 1030 localtime_r(&long_time, &t); 1031 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1032 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1033 t.tm_hour, t.tm_min, t.tm_sec); 1034 return buf; 1035 } 1036 1037 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1038 return localtime_r(clock, res); 1039 } 1040 1041 //////////////////////////////////////////////////////////////////////////////// 1042 // runtime exit support 1043 1044 // Note: os::shutdown() might be called very early during initialization, or 1045 // called from signal handler. Before adding something to os::shutdown(), make 1046 // sure it is async-safe and can handle partially initialized VM. 1047 void os::shutdown() { 1048 1049 // allow PerfMemory to attempt cleanup of any persistent resources 1050 perfMemory_exit(); 1051 1052 // needs to remove object in file system 1053 AttachListener::abort(); 1054 1055 // flush buffered output, finish log files 1056 ostream_abort(); 1057 1058 // Check for abort hook 1059 abort_hook_t abort_hook = Arguments::abort_hook(); 1060 if (abort_hook != NULL) { 1061 abort_hook(); 1062 } 1063 1064 } 1065 1066 // Note: os::abort() might be called very early during initialization, or 1067 // called from signal handler. Before adding something to os::abort(), make 1068 // sure it is async-safe and can handle partially initialized VM. 1069 void os::abort(bool dump_core, void* siginfo, const void* context) { 1070 os::shutdown(); 1071 if (dump_core) { 1072 #ifndef PRODUCT 1073 fdStream out(defaultStream::output_fd()); 1074 out.print_raw("Current thread is "); 1075 char buf[16]; 1076 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1077 out.print_raw_cr(buf); 1078 out.print_raw_cr("Dumping core ..."); 1079 #endif 1080 ::abort(); // dump core 1081 } 1082 1083 ::exit(1); 1084 } 1085 1086 // Die immediately, no exit hook, no abort hook, no cleanup. 1087 // Dump a core file, if possible, for debugging. 1088 void os::die() { 1089 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1090 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1091 // and don't take the time to generate a core file. 1092 os::signal_raise(SIGKILL); 1093 } else { 1094 // _exit() on BsdThreads only kills current thread 1095 ::abort(); 1096 } 1097 } 1098 1099 // Information of current thread in variety of formats 1100 pid_t os::Bsd::gettid() { 1101 int retval = -1; 1102 1103 #ifdef __APPLE__ //XNU kernel 1104 // despite the fact mach port is actually not a thread id use it 1105 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1106 retval = ::pthread_mach_thread_np(::pthread_self()); 1107 guarantee(retval != 0, "just checking"); 1108 return retval; 1109 1110 #else 1111 #ifdef __FreeBSD__ 1112 retval = syscall(SYS_thr_self); 1113 #else 1114 #ifdef __OpenBSD__ 1115 retval = syscall(SYS_getthrid); 1116 #else 1117 #ifdef __NetBSD__ 1118 retval = (pid_t) syscall(SYS__lwp_self); 1119 #endif 1120 #endif 1121 #endif 1122 #endif 1123 1124 if (retval == -1) { 1125 return getpid(); 1126 } 1127 } 1128 1129 intx os::current_thread_id() { 1130 #ifdef __APPLE__ 1131 return (intx)::pthread_mach_thread_np(::pthread_self()); 1132 #else 1133 return (intx)::pthread_self(); 1134 #endif 1135 } 1136 1137 int os::current_process_id() { 1138 return (int)(getpid()); 1139 } 1140 1141 // DLL functions 1142 1143 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1144 1145 // This must be hard coded because it's the system's temporary 1146 // directory not the java application's temp directory, ala java.io.tmpdir. 1147 #ifdef __APPLE__ 1148 // macosx has a secure per-user temporary directory 1149 char temp_path_storage[PATH_MAX]; 1150 const char* os::get_temp_directory() { 1151 static char *temp_path = NULL; 1152 if (temp_path == NULL) { 1153 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1154 if (pathSize == 0 || pathSize > PATH_MAX) { 1155 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1156 } 1157 temp_path = temp_path_storage; 1158 } 1159 return temp_path; 1160 } 1161 #else // __APPLE__ 1162 const char* os::get_temp_directory() { return "/tmp"; } 1163 #endif // __APPLE__ 1164 1165 // check if addr is inside libjvm.so 1166 bool os::address_is_in_vm(address addr) { 1167 static address libjvm_base_addr; 1168 Dl_info dlinfo; 1169 1170 if (libjvm_base_addr == NULL) { 1171 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1172 libjvm_base_addr = (address)dlinfo.dli_fbase; 1173 } 1174 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1175 } 1176 1177 if (dladdr((void *)addr, &dlinfo) != 0) { 1178 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1179 } 1180 1181 return false; 1182 } 1183 1184 1185 #define MACH_MAXSYMLEN 256 1186 1187 bool os::dll_address_to_function_name(address addr, char *buf, 1188 int buflen, int *offset, 1189 bool demangle) { 1190 // buf is not optional, but offset is optional 1191 assert(buf != NULL, "sanity check"); 1192 1193 Dl_info dlinfo; 1194 char localbuf[MACH_MAXSYMLEN]; 1195 1196 if (dladdr((void*)addr, &dlinfo) != 0) { 1197 // see if we have a matching symbol 1198 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1199 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1200 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1201 } 1202 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1203 return true; 1204 } 1205 // no matching symbol so try for just file info 1206 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1207 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1208 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1209 return true; 1210 } 1211 } 1212 1213 // Handle non-dynamic manually: 1214 if (dlinfo.dli_fbase != NULL && 1215 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1216 dlinfo.dli_fbase)) { 1217 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1218 jio_snprintf(buf, buflen, "%s", localbuf); 1219 } 1220 return true; 1221 } 1222 } 1223 buf[0] = '\0'; 1224 if (offset != NULL) *offset = -1; 1225 return false; 1226 } 1227 1228 // ported from solaris version 1229 bool os::dll_address_to_library_name(address addr, char* buf, 1230 int buflen, int* offset) { 1231 // buf is not optional, but offset is optional 1232 assert(buf != NULL, "sanity check"); 1233 1234 Dl_info dlinfo; 1235 1236 if (dladdr((void*)addr, &dlinfo) != 0) { 1237 if (dlinfo.dli_fname != NULL) { 1238 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1239 } 1240 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1241 *offset = addr - (address)dlinfo.dli_fbase; 1242 } 1243 return true; 1244 } 1245 1246 buf[0] = '\0'; 1247 if (offset) *offset = -1; 1248 return false; 1249 } 1250 1251 // Loads .dll/.so and 1252 // in case of error it checks if .dll/.so was built for the 1253 // same architecture as Hotspot is running on 1254 1255 #ifdef __APPLE__ 1256 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1257 #ifdef STATIC_BUILD 1258 return os::get_default_process_handle(); 1259 #else 1260 log_info(os)("attempting shared library load of %s", filename); 1261 1262 void * result= ::dlopen(filename, RTLD_LAZY); 1263 if (result != NULL) { 1264 Events::log(NULL, "Loaded shared library %s", filename); 1265 // Successful loading 1266 log_info(os)("shared library load of %s was successful", filename); 1267 return result; 1268 } 1269 1270 const char* error_report = ::dlerror(); 1271 if (error_report == NULL) { 1272 error_report = "dlerror returned no error description"; 1273 } 1274 if (ebuf != NULL && ebuflen > 0) { 1275 // Read system error message into ebuf 1276 ::strncpy(ebuf, error_report, ebuflen-1); 1277 ebuf[ebuflen-1]='\0'; 1278 } 1279 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1280 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1281 1282 return NULL; 1283 #endif // STATIC_BUILD 1284 } 1285 #else 1286 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1287 #ifdef STATIC_BUILD 1288 return os::get_default_process_handle(); 1289 #else 1290 log_info(os)("attempting shared library load of %s", filename); 1291 void * result= ::dlopen(filename, RTLD_LAZY); 1292 if (result != NULL) { 1293 Events::log(NULL, "Loaded shared library %s", filename); 1294 // Successful loading 1295 log_info(os)("shared library load of %s was successful", filename); 1296 return result; 1297 } 1298 1299 Elf32_Ehdr elf_head; 1300 1301 const char* const error_report = ::dlerror(); 1302 if (error_report == NULL) { 1303 error_report = "dlerror returned no error description"; 1304 } 1305 if (ebuf != NULL && ebuflen > 0) { 1306 // Read system error message into ebuf 1307 ::strncpy(ebuf, error_report, ebuflen-1); 1308 ebuf[ebuflen-1]='\0'; 1309 } 1310 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1311 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1312 1313 int diag_msg_max_length=ebuflen-strlen(ebuf); 1314 char* diag_msg_buf=ebuf+strlen(ebuf); 1315 1316 if (diag_msg_max_length==0) { 1317 // No more space in ebuf for additional diagnostics message 1318 return NULL; 1319 } 1320 1321 1322 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1323 1324 if (file_descriptor < 0) { 1325 // Can't open library, report dlerror() message 1326 return NULL; 1327 } 1328 1329 bool failed_to_read_elf_head= 1330 (sizeof(elf_head)!= 1331 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1332 1333 ::close(file_descriptor); 1334 if (failed_to_read_elf_head) { 1335 // file i/o error - report dlerror() msg 1336 return NULL; 1337 } 1338 1339 typedef struct { 1340 Elf32_Half code; // Actual value as defined in elf.h 1341 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1342 char elf_class; // 32 or 64 bit 1343 char endianess; // MSB or LSB 1344 char* name; // String representation 1345 } arch_t; 1346 1347 #ifndef EM_486 1348 #define EM_486 6 /* Intel 80486 */ 1349 #endif 1350 1351 #ifndef EM_MIPS_RS3_LE 1352 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1353 #endif 1354 1355 #ifndef EM_PPC64 1356 #define EM_PPC64 21 /* PowerPC64 */ 1357 #endif 1358 1359 #ifndef EM_S390 1360 #define EM_S390 22 /* IBM System/390 */ 1361 #endif 1362 1363 #ifndef EM_IA_64 1364 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1365 #endif 1366 1367 #ifndef EM_X86_64 1368 #define EM_X86_64 62 /* AMD x86-64 */ 1369 #endif 1370 1371 static const arch_t arch_array[]={ 1372 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1373 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1374 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1375 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1376 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1377 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1378 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1379 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1380 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1381 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1382 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1383 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1384 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1385 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1386 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1387 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1388 }; 1389 1390 #if (defined IA32) 1391 static Elf32_Half running_arch_code=EM_386; 1392 #elif (defined AMD64) 1393 static Elf32_Half running_arch_code=EM_X86_64; 1394 #elif (defined IA64) 1395 static Elf32_Half running_arch_code=EM_IA_64; 1396 #elif (defined __sparc) && (defined _LP64) 1397 static Elf32_Half running_arch_code=EM_SPARCV9; 1398 #elif (defined __sparc) && (!defined _LP64) 1399 static Elf32_Half running_arch_code=EM_SPARC; 1400 #elif (defined __powerpc64__) 1401 static Elf32_Half running_arch_code=EM_PPC64; 1402 #elif (defined __powerpc__) 1403 static Elf32_Half running_arch_code=EM_PPC; 1404 #elif (defined ARM) 1405 static Elf32_Half running_arch_code=EM_ARM; 1406 #elif (defined S390) 1407 static Elf32_Half running_arch_code=EM_S390; 1408 #elif (defined ALPHA) 1409 static Elf32_Half running_arch_code=EM_ALPHA; 1410 #elif (defined MIPSEL) 1411 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1412 #elif (defined PARISC) 1413 static Elf32_Half running_arch_code=EM_PARISC; 1414 #elif (defined MIPS) 1415 static Elf32_Half running_arch_code=EM_MIPS; 1416 #elif (defined M68K) 1417 static Elf32_Half running_arch_code=EM_68K; 1418 #else 1419 #error Method os::dll_load requires that one of following is defined:\ 1420 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1421 #endif 1422 1423 // Identify compatability class for VM's architecture and library's architecture 1424 // Obtain string descriptions for architectures 1425 1426 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1427 int running_arch_index=-1; 1428 1429 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1430 if (running_arch_code == arch_array[i].code) { 1431 running_arch_index = i; 1432 } 1433 if (lib_arch.code == arch_array[i].code) { 1434 lib_arch.compat_class = arch_array[i].compat_class; 1435 lib_arch.name = arch_array[i].name; 1436 } 1437 } 1438 1439 assert(running_arch_index != -1, 1440 "Didn't find running architecture code (running_arch_code) in arch_array"); 1441 if (running_arch_index == -1) { 1442 // Even though running architecture detection failed 1443 // we may still continue with reporting dlerror() message 1444 return NULL; 1445 } 1446 1447 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1448 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1449 return NULL; 1450 } 1451 1452 #ifndef S390 1453 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1454 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1455 return NULL; 1456 } 1457 #endif // !S390 1458 1459 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1460 if (lib_arch.name!=NULL) { 1461 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1462 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1463 lib_arch.name, arch_array[running_arch_index].name); 1464 } else { 1465 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1466 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1467 lib_arch.code, 1468 arch_array[running_arch_index].name); 1469 } 1470 } 1471 1472 return NULL; 1473 #endif // STATIC_BUILD 1474 } 1475 #endif // !__APPLE__ 1476 1477 void* os::get_default_process_handle() { 1478 #ifdef __APPLE__ 1479 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1480 // to avoid finding unexpected symbols on second (or later) 1481 // loads of a library. 1482 return (void*)::dlopen(NULL, RTLD_FIRST); 1483 #else 1484 return (void*)::dlopen(NULL, RTLD_LAZY); 1485 #endif 1486 } 1487 1488 // XXX: Do we need a lock around this as per Linux? 1489 void* os::dll_lookup(void* handle, const char* name) { 1490 return dlsym(handle, name); 1491 } 1492 1493 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1494 outputStream * out = (outputStream *) param; 1495 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name); 1496 return 0; 1497 } 1498 1499 void os::print_dll_info(outputStream *st) { 1500 st->print_cr("Dynamic libraries:"); 1501 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1502 st->print_cr("Error: Cannot print dynamic libraries."); 1503 } 1504 } 1505 1506 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1507 #ifdef RTLD_DI_LINKMAP 1508 Dl_info dli; 1509 void *handle; 1510 Link_map *map; 1511 Link_map *p; 1512 1513 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1514 dli.dli_fname == NULL) { 1515 return 1; 1516 } 1517 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1518 if (handle == NULL) { 1519 return 1; 1520 } 1521 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1522 if (map == NULL) { 1523 dlclose(handle); 1524 return 1; 1525 } 1526 1527 while (map->l_prev != NULL) 1528 map = map->l_prev; 1529 1530 while (map != NULL) { 1531 // Value for top_address is returned as 0 since we don't have any information about module size 1532 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1533 dlclose(handle); 1534 return 1; 1535 } 1536 map = map->l_next; 1537 } 1538 1539 dlclose(handle); 1540 #elif defined(__APPLE__) 1541 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1542 // Value for top_address is returned as 0 since we don't have any information about module size 1543 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1544 return 1; 1545 } 1546 } 1547 return 0; 1548 #else 1549 return 1; 1550 #endif 1551 } 1552 1553 void os::get_summary_os_info(char* buf, size_t buflen) { 1554 // These buffers are small because we want this to be brief 1555 // and not use a lot of stack while generating the hs_err file. 1556 char os[100]; 1557 size_t size = sizeof(os); 1558 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1559 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1560 #ifdef __APPLE__ 1561 strncpy(os, "Darwin", sizeof(os)); 1562 #elif __OpenBSD__ 1563 strncpy(os, "OpenBSD", sizeof(os)); 1564 #else 1565 strncpy(os, "BSD", sizeof(os)); 1566 #endif 1567 } 1568 1569 char release[100]; 1570 size = sizeof(release); 1571 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1572 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1573 // if error, leave blank 1574 strncpy(release, "", sizeof(release)); 1575 } 1576 snprintf(buf, buflen, "%s %s", os, release); 1577 } 1578 1579 void os::print_os_info_brief(outputStream* st) { 1580 os::Posix::print_uname_info(st); 1581 } 1582 1583 void os::print_os_info(outputStream* st) { 1584 st->print("OS:"); 1585 1586 os::Posix::print_uname_info(st); 1587 1588 os::Bsd::print_uptime_info(st); 1589 1590 os::Posix::print_rlimit_info(st); 1591 1592 os::Posix::print_load_average(st); 1593 } 1594 1595 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1596 // Nothing to do for now. 1597 } 1598 1599 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1600 unsigned int mhz; 1601 size_t size = sizeof(mhz); 1602 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1603 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1604 mhz = 1; // looks like an error but can be divided by 1605 } else { 1606 mhz /= 1000000; // reported in millions 1607 } 1608 1609 char model[100]; 1610 size = sizeof(model); 1611 int mib_model[] = { CTL_HW, HW_MODEL }; 1612 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1613 strncpy(model, cpu_arch, sizeof(model)); 1614 } 1615 1616 char machine[100]; 1617 size = sizeof(machine); 1618 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1619 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1620 strncpy(machine, "", sizeof(machine)); 1621 } 1622 1623 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1624 } 1625 1626 void os::print_memory_info(outputStream* st) { 1627 xsw_usage swap_usage; 1628 size_t size = sizeof(swap_usage); 1629 1630 st->print("Memory:"); 1631 st->print(" %dk page", os::vm_page_size()>>10); 1632 1633 st->print(", physical " UINT64_FORMAT "k", 1634 os::physical_memory() >> 10); 1635 st->print("(" UINT64_FORMAT "k free)", 1636 os::available_memory() >> 10); 1637 1638 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) { 1639 if (size >= offset_of(xsw_usage, xsu_used)) { 1640 st->print(", swap " UINT64_FORMAT "k", 1641 ((julong) swap_usage.xsu_total) >> 10); 1642 st->print("(" UINT64_FORMAT "k free)", 1643 ((julong) swap_usage.xsu_avail) >> 10); 1644 } 1645 } 1646 1647 st->cr(); 1648 } 1649 1650 static void print_signal_handler(outputStream* st, int sig, 1651 char* buf, size_t buflen); 1652 1653 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1654 st->print_cr("Signal Handlers:"); 1655 print_signal_handler(st, SIGSEGV, buf, buflen); 1656 print_signal_handler(st, SIGBUS , buf, buflen); 1657 print_signal_handler(st, SIGFPE , buf, buflen); 1658 print_signal_handler(st, SIGPIPE, buf, buflen); 1659 print_signal_handler(st, SIGXFSZ, buf, buflen); 1660 print_signal_handler(st, SIGILL , buf, buflen); 1661 print_signal_handler(st, SR_signum, buf, buflen); 1662 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1663 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1664 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1665 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1666 } 1667 1668 static char saved_jvm_path[MAXPATHLEN] = {0}; 1669 1670 // Find the full path to the current module, libjvm 1671 void os::jvm_path(char *buf, jint buflen) { 1672 // Error checking. 1673 if (buflen < MAXPATHLEN) { 1674 assert(false, "must use a large-enough buffer"); 1675 buf[0] = '\0'; 1676 return; 1677 } 1678 // Lazy resolve the path to current module. 1679 if (saved_jvm_path[0] != 0) { 1680 strcpy(buf, saved_jvm_path); 1681 return; 1682 } 1683 1684 char dli_fname[MAXPATHLEN]; 1685 bool ret = dll_address_to_library_name( 1686 CAST_FROM_FN_PTR(address, os::jvm_path), 1687 dli_fname, sizeof(dli_fname), NULL); 1688 assert(ret, "cannot locate libjvm"); 1689 char *rp = NULL; 1690 if (ret && dli_fname[0] != '\0') { 1691 rp = os::Posix::realpath(dli_fname, buf, buflen); 1692 } 1693 if (rp == NULL) { 1694 return; 1695 } 1696 1697 if (Arguments::sun_java_launcher_is_altjvm()) { 1698 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1699 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1700 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1701 // appears at the right place in the string, then assume we are 1702 // installed in a JDK and we're done. Otherwise, check for a 1703 // JAVA_HOME environment variable and construct a path to the JVM 1704 // being overridden. 1705 1706 const char *p = buf + strlen(buf) - 1; 1707 for (int count = 0; p > buf && count < 5; ++count) { 1708 for (--p; p > buf && *p != '/'; --p) 1709 /* empty */ ; 1710 } 1711 1712 if (strncmp(p, "/jre/lib/", 9) != 0) { 1713 // Look for JAVA_HOME in the environment. 1714 char* java_home_var = ::getenv("JAVA_HOME"); 1715 if (java_home_var != NULL && java_home_var[0] != 0) { 1716 char* jrelib_p; 1717 int len; 1718 1719 // Check the current module name "libjvm" 1720 p = strrchr(buf, '/'); 1721 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1722 1723 rp = os::Posix::realpath(java_home_var, buf, buflen); 1724 if (rp == NULL) { 1725 return; 1726 } 1727 1728 // determine if this is a legacy image or modules image 1729 // modules image doesn't have "jre" subdirectory 1730 len = strlen(buf); 1731 assert(len < buflen, "Ran out of buffer space"); 1732 jrelib_p = buf + len; 1733 1734 // Add the appropriate library subdir 1735 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1736 if (0 != access(buf, F_OK)) { 1737 snprintf(jrelib_p, buflen-len, "/lib"); 1738 } 1739 1740 // Add the appropriate client or server subdir 1741 len = strlen(buf); 1742 jrelib_p = buf + len; 1743 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1744 if (0 != access(buf, F_OK)) { 1745 snprintf(jrelib_p, buflen-len, "%s", ""); 1746 } 1747 1748 // If the path exists within JAVA_HOME, add the JVM library name 1749 // to complete the path to JVM being overridden. Otherwise fallback 1750 // to the path to the current library. 1751 if (0 == access(buf, F_OK)) { 1752 // Use current module name "libjvm" 1753 len = strlen(buf); 1754 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1755 } else { 1756 // Fall back to path of current library 1757 rp = os::Posix::realpath(dli_fname, buf, buflen); 1758 if (rp == NULL) { 1759 return; 1760 } 1761 } 1762 } 1763 } 1764 } 1765 1766 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1767 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1768 } 1769 1770 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1771 // no prefix required, not even "_" 1772 } 1773 1774 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1775 // no suffix required 1776 } 1777 1778 //////////////////////////////////////////////////////////////////////////////// 1779 // sun.misc.Signal support 1780 1781 static void UserHandler(int sig, void *siginfo, void *context) { 1782 // Ctrl-C is pressed during error reporting, likely because the error 1783 // handler fails to abort. Let VM die immediately. 1784 if (sig == SIGINT && VMError::is_error_reported()) { 1785 os::die(); 1786 } 1787 1788 os::signal_notify(sig); 1789 } 1790 1791 void* os::user_handler() { 1792 return CAST_FROM_FN_PTR(void*, UserHandler); 1793 } 1794 1795 extern "C" { 1796 typedef void (*sa_handler_t)(int); 1797 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1798 } 1799 1800 void* os::signal(int signal_number, void* handler) { 1801 struct sigaction sigAct, oldSigAct; 1802 1803 sigfillset(&(sigAct.sa_mask)); 1804 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1805 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1806 1807 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1808 // -1 means registration failed 1809 return (void *)-1; 1810 } 1811 1812 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1813 } 1814 1815 void os::signal_raise(int signal_number) { 1816 ::raise(signal_number); 1817 } 1818 1819 // The following code is moved from os.cpp for making this 1820 // code platform specific, which it is by its very nature. 1821 1822 // Will be modified when max signal is changed to be dynamic 1823 int os::sigexitnum_pd() { 1824 return NSIG; 1825 } 1826 1827 // a counter for each possible signal value 1828 static volatile jint pending_signals[NSIG+1] = { 0 }; 1829 static Semaphore* sig_sem = NULL; 1830 1831 static void jdk_misc_signal_init() { 1832 // Initialize signal structures 1833 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1834 1835 // Initialize signal semaphore 1836 sig_sem = new Semaphore(); 1837 } 1838 1839 void os::signal_notify(int sig) { 1840 if (sig_sem != NULL) { 1841 Atomic::inc(&pending_signals[sig]); 1842 sig_sem->signal(); 1843 } else { 1844 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 1845 // initialization isn't called. 1846 assert(ReduceSignalUsage, "signal semaphore should be created"); 1847 } 1848 } 1849 1850 static int check_pending_signals() { 1851 for (;;) { 1852 for (int i = 0; i < NSIG + 1; i++) { 1853 jint n = pending_signals[i]; 1854 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) { 1855 return i; 1856 } 1857 } 1858 JavaThread *thread = JavaThread::current(); 1859 ThreadBlockInVM tbivm(thread); 1860 1861 bool threadIsSuspended; 1862 do { 1863 thread->set_suspend_equivalent(); 1864 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1865 sig_sem->wait(); 1866 1867 // were we externally suspended while we were waiting? 1868 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1869 if (threadIsSuspended) { 1870 // The semaphore has been incremented, but while we were waiting 1871 // another thread suspended us. We don't want to continue running 1872 // while suspended because that would surprise the thread that 1873 // suspended us. 1874 sig_sem->signal(); 1875 1876 thread->java_suspend_self(); 1877 } 1878 } while (threadIsSuspended); 1879 } 1880 } 1881 1882 int os::signal_wait() { 1883 return check_pending_signals(); 1884 } 1885 1886 //////////////////////////////////////////////////////////////////////////////// 1887 // Virtual Memory 1888 1889 int os::vm_page_size() { 1890 // Seems redundant as all get out 1891 assert(os::Bsd::page_size() != -1, "must call os::init"); 1892 return os::Bsd::page_size(); 1893 } 1894 1895 // Solaris allocates memory by pages. 1896 int os::vm_allocation_granularity() { 1897 assert(os::Bsd::page_size() != -1, "must call os::init"); 1898 return os::Bsd::page_size(); 1899 } 1900 1901 // Rationale behind this function: 1902 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1903 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1904 // samples for JITted code. Here we create private executable mapping over the code cache 1905 // and then we can use standard (well, almost, as mapping can change) way to provide 1906 // info for the reporting script by storing timestamp and location of symbol 1907 void bsd_wrap_code(char* base, size_t size) { 1908 static volatile jint cnt = 0; 1909 1910 if (!UseOprofile) { 1911 return; 1912 } 1913 1914 char buf[PATH_MAX + 1]; 1915 int num = Atomic::add(&cnt, 1); 1916 1917 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1918 os::get_temp_directory(), os::current_process_id(), num); 1919 unlink(buf); 1920 1921 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1922 1923 if (fd != -1) { 1924 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1925 if (rv != (off_t)-1) { 1926 if (::write(fd, "", 1) == 1) { 1927 mmap(base, size, 1928 PROT_READ|PROT_WRITE|PROT_EXEC, 1929 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1930 } 1931 } 1932 ::close(fd); 1933 unlink(buf); 1934 } 1935 } 1936 1937 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 1938 int err) { 1939 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT 1940 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec, 1941 os::errno_name(err), err); 1942 } 1943 1944 // NOTE: Bsd kernel does not really reserve the pages for us. 1945 // All it does is to check if there are enough free pages 1946 // left at the time of mmap(). This could be a potential 1947 // problem. 1948 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1949 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 1950 #ifdef __OpenBSD__ 1951 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 1952 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 1953 if (::mprotect(addr, size, prot) == 0) { 1954 return true; 1955 } 1956 #else 1957 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 1958 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 1959 if (res != (uintptr_t) MAP_FAILED) { 1960 return true; 1961 } 1962 #endif 1963 1964 // Warn about any commit errors we see in non-product builds just 1965 // in case mmap() doesn't work as described on the man page. 1966 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 1967 1968 return false; 1969 } 1970 1971 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 1972 bool exec) { 1973 // alignment_hint is ignored on this OS 1974 return pd_commit_memory(addr, size, exec); 1975 } 1976 1977 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 1978 const char* mesg) { 1979 assert(mesg != NULL, "mesg must be specified"); 1980 if (!pd_commit_memory(addr, size, exec)) { 1981 // add extra info in product mode for vm_exit_out_of_memory(): 1982 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 1983 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 1984 } 1985 } 1986 1987 void os::pd_commit_memory_or_exit(char* addr, size_t size, 1988 size_t alignment_hint, bool exec, 1989 const char* mesg) { 1990 // alignment_hint is ignored on this OS 1991 pd_commit_memory_or_exit(addr, size, exec, mesg); 1992 } 1993 1994 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1995 } 1996 1997 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 1998 ::madvise(addr, bytes, MADV_DONTNEED); 1999 } 2000 2001 void os::numa_make_global(char *addr, size_t bytes) { 2002 } 2003 2004 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2005 } 2006 2007 bool os::numa_topology_changed() { return false; } 2008 2009 size_t os::numa_get_groups_num() { 2010 return 1; 2011 } 2012 2013 int os::numa_get_group_id() { 2014 return 0; 2015 } 2016 2017 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2018 if (size > 0) { 2019 ids[0] = 0; 2020 return 1; 2021 } 2022 return 0; 2023 } 2024 2025 int os::numa_get_group_id_for_address(const void* address) { 2026 return 0; 2027 } 2028 2029 bool os::get_page_info(char *start, page_info* info) { 2030 return false; 2031 } 2032 2033 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2034 return end; 2035 } 2036 2037 2038 bool os::pd_uncommit_memory(char* addr, size_t size) { 2039 #ifdef __OpenBSD__ 2040 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2041 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size)); 2042 return ::mprotect(addr, size, PROT_NONE) == 0; 2043 #else 2044 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2045 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2046 return res != (uintptr_t) MAP_FAILED; 2047 #endif 2048 } 2049 2050 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2051 return os::commit_memory(addr, size, !ExecMem); 2052 } 2053 2054 // If this is a growable mapping, remove the guard pages entirely by 2055 // munmap()ping them. If not, just call uncommit_memory(). 2056 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2057 return os::uncommit_memory(addr, size); 2058 } 2059 2060 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2061 // at 'requested_addr'. If there are existing memory mappings at the same 2062 // location, however, they will be overwritten. If 'fixed' is false, 2063 // 'requested_addr' is only treated as a hint, the return value may or 2064 // may not start from the requested address. Unlike Bsd mmap(), this 2065 // function returns NULL to indicate failure. 2066 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2067 char * addr; 2068 int flags; 2069 2070 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2071 if (fixed) { 2072 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2073 flags |= MAP_FIXED; 2074 } 2075 2076 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2077 // touch an uncommitted page. Otherwise, the read/write might 2078 // succeed if we have enough swap space to back the physical page. 2079 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2080 flags, -1, 0); 2081 2082 return addr == MAP_FAILED ? NULL : addr; 2083 } 2084 2085 static int anon_munmap(char * addr, size_t size) { 2086 return ::munmap(addr, size) == 0; 2087 } 2088 2089 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2090 size_t alignment_hint) { 2091 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2092 } 2093 2094 bool os::pd_release_memory(char* addr, size_t size) { 2095 return anon_munmap(addr, size); 2096 } 2097 2098 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2099 // Bsd wants the mprotect address argument to be page aligned. 2100 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size()); 2101 2102 // According to SUSv3, mprotect() should only be used with mappings 2103 // established by mmap(), and mmap() always maps whole pages. Unaligned 2104 // 'addr' likely indicates problem in the VM (e.g. trying to change 2105 // protection of malloc'ed or statically allocated memory). Check the 2106 // caller if you hit this assert. 2107 assert(addr == bottom, "sanity check"); 2108 2109 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2110 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot); 2111 return ::mprotect(bottom, size, prot) == 0; 2112 } 2113 2114 // Set protections specified 2115 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2116 bool is_committed) { 2117 unsigned int p = 0; 2118 switch (prot) { 2119 case MEM_PROT_NONE: p = PROT_NONE; break; 2120 case MEM_PROT_READ: p = PROT_READ; break; 2121 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2122 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2123 default: 2124 ShouldNotReachHere(); 2125 } 2126 // is_committed is unused. 2127 return bsd_mprotect(addr, bytes, p); 2128 } 2129 2130 bool os::guard_memory(char* addr, size_t size) { 2131 return bsd_mprotect(addr, size, PROT_NONE); 2132 } 2133 2134 bool os::unguard_memory(char* addr, size_t size) { 2135 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2136 } 2137 2138 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2139 return false; 2140 } 2141 2142 // Large page support 2143 2144 static size_t _large_page_size = 0; 2145 2146 void os::large_page_init() { 2147 } 2148 2149 2150 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2151 fatal("os::reserve_memory_special should not be called on BSD."); 2152 return NULL; 2153 } 2154 2155 bool os::release_memory_special(char* base, size_t bytes) { 2156 fatal("os::release_memory_special should not be called on BSD."); 2157 return false; 2158 } 2159 2160 size_t os::large_page_size() { 2161 return _large_page_size; 2162 } 2163 2164 bool os::can_commit_large_page_memory() { 2165 // Does not matter, we do not support huge pages. 2166 return false; 2167 } 2168 2169 bool os::can_execute_large_page_memory() { 2170 // Does not matter, we do not support huge pages. 2171 return false; 2172 } 2173 2174 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2175 assert(file_desc >= 0, "file_desc is not valid"); 2176 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2177 if (result != NULL) { 2178 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2179 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2180 } 2181 } 2182 return result; 2183 } 2184 2185 // Reserve memory at an arbitrary address, only if that area is 2186 // available (and not reserved for something else). 2187 2188 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2189 // Assert only that the size is a multiple of the page size, since 2190 // that's all that mmap requires, and since that's all we really know 2191 // about at this low abstraction level. If we need higher alignment, 2192 // we can either pass an alignment to this method or verify alignment 2193 // in one of the methods further up the call chain. See bug 5044738. 2194 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2195 2196 // Repeatedly allocate blocks until the block is allocated at the 2197 // right spot. 2198 2199 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2200 // if kernel honors the hint then we can return immediately. 2201 char * addr = anon_mmap(requested_addr, bytes, false); 2202 if (addr == requested_addr) { 2203 return requested_addr; 2204 } 2205 2206 if (addr != NULL) { 2207 // mmap() is successful but it fails to reserve at the requested address 2208 anon_munmap(addr, bytes); 2209 } 2210 2211 return NULL; 2212 } 2213 2214 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2215 void os::infinite_sleep() { 2216 while (true) { // sleep forever ... 2217 ::sleep(100); // ... 100 seconds at a time 2218 } 2219 } 2220 2221 // Used to convert frequent JVM_Yield() to nops 2222 bool os::dont_yield() { 2223 return DontYieldALot; 2224 } 2225 2226 void os::naked_yield() { 2227 sched_yield(); 2228 } 2229 2230 //////////////////////////////////////////////////////////////////////////////// 2231 // thread priority support 2232 2233 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2234 // only supports dynamic priority, static priority must be zero. For real-time 2235 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2236 // However, for large multi-threaded applications, SCHED_RR is not only slower 2237 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2238 // of 5 runs - Sep 2005). 2239 // 2240 // The following code actually changes the niceness of kernel-thread/LWP. It 2241 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2242 // not the entire user process, and user level threads are 1:1 mapped to kernel 2243 // threads. It has always been the case, but could change in the future. For 2244 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2245 // It is only used when ThreadPriorityPolicy=1 and may require system level permission 2246 // (e.g., root privilege or CAP_SYS_NICE capability). 2247 2248 #if !defined(__APPLE__) 2249 int os::java_to_os_priority[CriticalPriority + 1] = { 2250 19, // 0 Entry should never be used 2251 2252 0, // 1 MinPriority 2253 3, // 2 2254 6, // 3 2255 2256 10, // 4 2257 15, // 5 NormPriority 2258 18, // 6 2259 2260 21, // 7 2261 25, // 8 2262 28, // 9 NearMaxPriority 2263 2264 31, // 10 MaxPriority 2265 2266 31 // 11 CriticalPriority 2267 }; 2268 #else 2269 // Using Mach high-level priority assignments 2270 int os::java_to_os_priority[CriticalPriority + 1] = { 2271 0, // 0 Entry should never be used (MINPRI_USER) 2272 2273 27, // 1 MinPriority 2274 28, // 2 2275 29, // 3 2276 2277 30, // 4 2278 31, // 5 NormPriority (BASEPRI_DEFAULT) 2279 32, // 6 2280 2281 33, // 7 2282 34, // 8 2283 35, // 9 NearMaxPriority 2284 2285 36, // 10 MaxPriority 2286 2287 36 // 11 CriticalPriority 2288 }; 2289 #endif 2290 2291 static int prio_init() { 2292 if (ThreadPriorityPolicy == 1) { 2293 if (geteuid() != 0) { 2294 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2295 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \ 2296 "e.g., being the root user. If the necessary permission is not " \ 2297 "possessed, changes to priority will be silently ignored."); 2298 } 2299 } 2300 } 2301 if (UseCriticalJavaThreadPriority) { 2302 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2303 } 2304 return 0; 2305 } 2306 2307 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2308 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2309 2310 #ifdef __OpenBSD__ 2311 // OpenBSD pthread_setprio starves low priority threads 2312 return OS_OK; 2313 #elif defined(__FreeBSD__) 2314 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2315 return (ret == 0) ? OS_OK : OS_ERR; 2316 #elif defined(__APPLE__) || defined(__NetBSD__) 2317 struct sched_param sp; 2318 int policy; 2319 2320 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) { 2321 return OS_ERR; 2322 } 2323 2324 sp.sched_priority = newpri; 2325 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) { 2326 return OS_ERR; 2327 } 2328 2329 return OS_OK; 2330 #else 2331 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2332 return (ret == 0) ? OS_OK : OS_ERR; 2333 #endif 2334 } 2335 2336 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2337 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2338 *priority_ptr = java_to_os_priority[NormPriority]; 2339 return OS_OK; 2340 } 2341 2342 errno = 0; 2343 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2344 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2345 #elif defined(__APPLE__) || defined(__NetBSD__) 2346 int policy; 2347 struct sched_param sp; 2348 2349 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp); 2350 if (res != 0) { 2351 *priority_ptr = -1; 2352 return OS_ERR; 2353 } else { 2354 *priority_ptr = sp.sched_priority; 2355 return OS_OK; 2356 } 2357 #else 2358 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2359 #endif 2360 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2361 } 2362 2363 //////////////////////////////////////////////////////////////////////////////// 2364 // suspend/resume support 2365 2366 // The low-level signal-based suspend/resume support is a remnant from the 2367 // old VM-suspension that used to be for java-suspension, safepoints etc, 2368 // within hotspot. Currently used by JFR's OSThreadSampler 2369 // 2370 // The remaining code is greatly simplified from the more general suspension 2371 // code that used to be used. 2372 // 2373 // The protocol is quite simple: 2374 // - suspend: 2375 // - sends a signal to the target thread 2376 // - polls the suspend state of the osthread using a yield loop 2377 // - target thread signal handler (SR_handler) sets suspend state 2378 // and blocks in sigsuspend until continued 2379 // - resume: 2380 // - sets target osthread state to continue 2381 // - sends signal to end the sigsuspend loop in the SR_handler 2382 // 2383 // Note that the SR_lock plays no role in this suspend/resume protocol, 2384 // but is checked for NULL in SR_handler as a thread termination indicator. 2385 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2386 // 2387 // Note that resume_clear_context() and suspend_save_context() are needed 2388 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2389 // which in part is used by: 2390 // - Forte Analyzer: AsyncGetCallTrace() 2391 // - StackBanging: get_frame_at_stack_banging_point() 2392 2393 static void resume_clear_context(OSThread *osthread) { 2394 osthread->set_ucontext(NULL); 2395 osthread->set_siginfo(NULL); 2396 } 2397 2398 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2399 osthread->set_ucontext(context); 2400 osthread->set_siginfo(siginfo); 2401 } 2402 2403 // Handler function invoked when a thread's execution is suspended or 2404 // resumed. We have to be careful that only async-safe functions are 2405 // called here (Note: most pthread functions are not async safe and 2406 // should be avoided.) 2407 // 2408 // Note: sigwait() is a more natural fit than sigsuspend() from an 2409 // interface point of view, but sigwait() prevents the signal hander 2410 // from being run. libpthread would get very confused by not having 2411 // its signal handlers run and prevents sigwait()'s use with the 2412 // mutex granting granting signal. 2413 // 2414 // Currently only ever called on the VMThread or JavaThread 2415 // 2416 #ifdef __APPLE__ 2417 static OSXSemaphore sr_semaphore; 2418 #else 2419 static PosixSemaphore sr_semaphore; 2420 #endif 2421 2422 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2423 // Save and restore errno to avoid confusing native code with EINTR 2424 // after sigsuspend. 2425 int old_errno = errno; 2426 2427 Thread* thread = Thread::current_or_null_safe(); 2428 assert(thread != NULL, "Missing current thread in SR_handler"); 2429 2430 // On some systems we have seen signal delivery get "stuck" until the signal 2431 // mask is changed as part of thread termination. Check that the current thread 2432 // has not already terminated (via SR_lock()) - else the following assertion 2433 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2434 // destructor has completed. 2435 2436 if (thread->SR_lock() == NULL) { 2437 return; 2438 } 2439 2440 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2441 2442 OSThread* osthread = thread->osthread(); 2443 2444 os::SuspendResume::State current = osthread->sr.state(); 2445 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2446 suspend_save_context(osthread, siginfo, context); 2447 2448 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2449 os::SuspendResume::State state = osthread->sr.suspended(); 2450 if (state == os::SuspendResume::SR_SUSPENDED) { 2451 sigset_t suspend_set; // signals for sigsuspend() 2452 2453 // get current set of blocked signals and unblock resume signal 2454 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2455 sigdelset(&suspend_set, SR_signum); 2456 2457 sr_semaphore.signal(); 2458 // wait here until we are resumed 2459 while (1) { 2460 sigsuspend(&suspend_set); 2461 2462 os::SuspendResume::State result = osthread->sr.running(); 2463 if (result == os::SuspendResume::SR_RUNNING) { 2464 sr_semaphore.signal(); 2465 break; 2466 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2467 ShouldNotReachHere(); 2468 } 2469 } 2470 2471 } else if (state == os::SuspendResume::SR_RUNNING) { 2472 // request was cancelled, continue 2473 } else { 2474 ShouldNotReachHere(); 2475 } 2476 2477 resume_clear_context(osthread); 2478 } else if (current == os::SuspendResume::SR_RUNNING) { 2479 // request was cancelled, continue 2480 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2481 // ignore 2482 } else { 2483 // ignore 2484 } 2485 2486 errno = old_errno; 2487 } 2488 2489 2490 static int SR_initialize() { 2491 struct sigaction act; 2492 char *s; 2493 // Get signal number to use for suspend/resume 2494 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2495 int sig = ::strtol(s, 0, 10); 2496 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2497 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2498 SR_signum = sig; 2499 } else { 2500 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2501 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2502 } 2503 } 2504 2505 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2506 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2507 2508 sigemptyset(&SR_sigset); 2509 sigaddset(&SR_sigset, SR_signum); 2510 2511 // Set up signal handler for suspend/resume 2512 act.sa_flags = SA_RESTART|SA_SIGINFO; 2513 act.sa_handler = (void (*)(int)) SR_handler; 2514 2515 // SR_signum is blocked by default. 2516 // 4528190 - We also need to block pthread restart signal (32 on all 2517 // supported Bsd platforms). Note that BsdThreads need to block 2518 // this signal for all threads to work properly. So we don't have 2519 // to use hard-coded signal number when setting up the mask. 2520 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2521 2522 if (sigaction(SR_signum, &act, 0) == -1) { 2523 return -1; 2524 } 2525 2526 // Save signal flag 2527 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2528 return 0; 2529 } 2530 2531 static int sr_notify(OSThread* osthread) { 2532 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2533 assert_status(status == 0, status, "pthread_kill"); 2534 return status; 2535 } 2536 2537 // "Randomly" selected value for how long we want to spin 2538 // before bailing out on suspending a thread, also how often 2539 // we send a signal to a thread we want to resume 2540 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2541 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2542 2543 // returns true on success and false on error - really an error is fatal 2544 // but this seems the normal response to library errors 2545 static bool do_suspend(OSThread* osthread) { 2546 assert(osthread->sr.is_running(), "thread should be running"); 2547 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2548 2549 // mark as suspended and send signal 2550 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2551 // failed to switch, state wasn't running? 2552 ShouldNotReachHere(); 2553 return false; 2554 } 2555 2556 if (sr_notify(osthread) != 0) { 2557 ShouldNotReachHere(); 2558 } 2559 2560 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2561 while (true) { 2562 if (sr_semaphore.timedwait(2)) { 2563 break; 2564 } else { 2565 // timeout 2566 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2567 if (cancelled == os::SuspendResume::SR_RUNNING) { 2568 return false; 2569 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2570 // make sure that we consume the signal on the semaphore as well 2571 sr_semaphore.wait(); 2572 break; 2573 } else { 2574 ShouldNotReachHere(); 2575 return false; 2576 } 2577 } 2578 } 2579 2580 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2581 return true; 2582 } 2583 2584 static void do_resume(OSThread* osthread) { 2585 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2586 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2587 2588 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2589 // failed to switch to WAKEUP_REQUEST 2590 ShouldNotReachHere(); 2591 return; 2592 } 2593 2594 while (true) { 2595 if (sr_notify(osthread) == 0) { 2596 if (sr_semaphore.timedwait(2)) { 2597 if (osthread->sr.is_running()) { 2598 return; 2599 } 2600 } 2601 } else { 2602 ShouldNotReachHere(); 2603 } 2604 } 2605 2606 guarantee(osthread->sr.is_running(), "Must be running!"); 2607 } 2608 2609 /////////////////////////////////////////////////////////////////////////////////// 2610 // signal handling (except suspend/resume) 2611 2612 // This routine may be used by user applications as a "hook" to catch signals. 2613 // The user-defined signal handler must pass unrecognized signals to this 2614 // routine, and if it returns true (non-zero), then the signal handler must 2615 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2616 // routine will never retun false (zero), but instead will execute a VM panic 2617 // routine kill the process. 2618 // 2619 // If this routine returns false, it is OK to call it again. This allows 2620 // the user-defined signal handler to perform checks either before or after 2621 // the VM performs its own checks. Naturally, the user code would be making 2622 // a serious error if it tried to handle an exception (such as a null check 2623 // or breakpoint) that the VM was generating for its own correct operation. 2624 // 2625 // This routine may recognize any of the following kinds of signals: 2626 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2627 // It should be consulted by handlers for any of those signals. 2628 // 2629 // The caller of this routine must pass in the three arguments supplied 2630 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2631 // field of the structure passed to sigaction(). This routine assumes that 2632 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2633 // 2634 // Note that the VM will print warnings if it detects conflicting signal 2635 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2636 // 2637 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2638 void* ucontext, 2639 int abort_if_unrecognized); 2640 2641 static void signalHandler(int sig, siginfo_t* info, void* uc) { 2642 assert(info != NULL && uc != NULL, "it must be old kernel"); 2643 int orig_errno = errno; // Preserve errno value over signal handler. 2644 JVM_handle_bsd_signal(sig, info, uc, true); 2645 errno = orig_errno; 2646 } 2647 2648 2649 // This boolean allows users to forward their own non-matching signals 2650 // to JVM_handle_bsd_signal, harmlessly. 2651 bool os::Bsd::signal_handlers_are_installed = false; 2652 2653 // For signal-chaining 2654 bool os::Bsd::libjsig_is_loaded = false; 2655 typedef struct sigaction *(*get_signal_t)(int); 2656 get_signal_t os::Bsd::get_signal_action = NULL; 2657 2658 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2659 struct sigaction *actp = NULL; 2660 2661 if (libjsig_is_loaded) { 2662 // Retrieve the old signal handler from libjsig 2663 actp = (*get_signal_action)(sig); 2664 } 2665 if (actp == NULL) { 2666 // Retrieve the preinstalled signal handler from jvm 2667 actp = os::Posix::get_preinstalled_handler(sig); 2668 } 2669 2670 return actp; 2671 } 2672 2673 static bool call_chained_handler(struct sigaction *actp, int sig, 2674 siginfo_t *siginfo, void *context) { 2675 // Call the old signal handler 2676 if (actp->sa_handler == SIG_DFL) { 2677 // It's more reasonable to let jvm treat it as an unexpected exception 2678 // instead of taking the default action. 2679 return false; 2680 } else if (actp->sa_handler != SIG_IGN) { 2681 if ((actp->sa_flags & SA_NODEFER) == 0) { 2682 // automaticlly block the signal 2683 sigaddset(&(actp->sa_mask), sig); 2684 } 2685 2686 sa_handler_t hand; 2687 sa_sigaction_t sa; 2688 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2689 // retrieve the chained handler 2690 if (siginfo_flag_set) { 2691 sa = actp->sa_sigaction; 2692 } else { 2693 hand = actp->sa_handler; 2694 } 2695 2696 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2697 actp->sa_handler = SIG_DFL; 2698 } 2699 2700 // try to honor the signal mask 2701 sigset_t oset; 2702 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2703 2704 // call into the chained handler 2705 if (siginfo_flag_set) { 2706 (*sa)(sig, siginfo, context); 2707 } else { 2708 (*hand)(sig); 2709 } 2710 2711 // restore the signal mask 2712 pthread_sigmask(SIG_SETMASK, &oset, 0); 2713 } 2714 // Tell jvm's signal handler the signal is taken care of. 2715 return true; 2716 } 2717 2718 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2719 bool chained = false; 2720 // signal-chaining 2721 if (UseSignalChaining) { 2722 struct sigaction *actp = get_chained_signal_action(sig); 2723 if (actp != NULL) { 2724 chained = call_chained_handler(actp, sig, siginfo, context); 2725 } 2726 } 2727 return chained; 2728 } 2729 2730 // for diagnostic 2731 int sigflags[NSIG]; 2732 2733 int os::Bsd::get_our_sigflags(int sig) { 2734 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2735 return sigflags[sig]; 2736 } 2737 2738 void os::Bsd::set_our_sigflags(int sig, int flags) { 2739 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2740 if (sig > 0 && sig < NSIG) { 2741 sigflags[sig] = flags; 2742 } 2743 } 2744 2745 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 2746 // Check for overwrite. 2747 struct sigaction oldAct; 2748 sigaction(sig, (struct sigaction*)NULL, &oldAct); 2749 2750 void* oldhand = oldAct.sa_sigaction 2751 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2752 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2753 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 2754 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 2755 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 2756 if (AllowUserSignalHandlers || !set_installed) { 2757 // Do not overwrite; user takes responsibility to forward to us. 2758 return; 2759 } else if (UseSignalChaining) { 2760 // save the old handler in jvm 2761 os::Posix::save_preinstalled_handler(sig, oldAct); 2762 // libjsig also interposes the sigaction() call below and saves the 2763 // old sigaction on it own. 2764 } else { 2765 fatal("Encountered unexpected pre-existing sigaction handler " 2766 "%#lx for signal %d.", (long)oldhand, sig); 2767 } 2768 } 2769 2770 struct sigaction sigAct; 2771 sigfillset(&(sigAct.sa_mask)); 2772 sigAct.sa_handler = SIG_DFL; 2773 if (!set_installed) { 2774 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2775 } else { 2776 sigAct.sa_sigaction = signalHandler; 2777 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2778 } 2779 #ifdef __APPLE__ 2780 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 2781 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 2782 // if the signal handler declares it will handle it on alternate stack. 2783 // Notice we only declare we will handle it on alt stack, but we are not 2784 // actually going to use real alt stack - this is just a workaround. 2785 // Please see ux_exception.c, method catch_mach_exception_raise for details 2786 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 2787 if (sig == SIGSEGV) { 2788 sigAct.sa_flags |= SA_ONSTACK; 2789 } 2790 #endif 2791 2792 // Save flags, which are set by ours 2793 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2794 sigflags[sig] = sigAct.sa_flags; 2795 2796 int ret = sigaction(sig, &sigAct, &oldAct); 2797 assert(ret == 0, "check"); 2798 2799 void* oldhand2 = oldAct.sa_sigaction 2800 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2801 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2802 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 2803 } 2804 2805 // install signal handlers for signals that HotSpot needs to 2806 // handle in order to support Java-level exception handling. 2807 2808 void os::Bsd::install_signal_handlers() { 2809 if (!signal_handlers_are_installed) { 2810 signal_handlers_are_installed = true; 2811 2812 // signal-chaining 2813 typedef void (*signal_setting_t)(); 2814 signal_setting_t begin_signal_setting = NULL; 2815 signal_setting_t end_signal_setting = NULL; 2816 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2817 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 2818 if (begin_signal_setting != NULL) { 2819 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2820 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 2821 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 2822 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 2823 libjsig_is_loaded = true; 2824 assert(UseSignalChaining, "should enable signal-chaining"); 2825 } 2826 if (libjsig_is_loaded) { 2827 // Tell libjsig jvm is setting signal handlers 2828 (*begin_signal_setting)(); 2829 } 2830 2831 set_signal_handler(SIGSEGV, true); 2832 set_signal_handler(SIGPIPE, true); 2833 set_signal_handler(SIGBUS, true); 2834 set_signal_handler(SIGILL, true); 2835 set_signal_handler(SIGFPE, true); 2836 set_signal_handler(SIGXFSZ, true); 2837 2838 #if defined(__APPLE__) 2839 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 2840 // signals caught and handled by the JVM. To work around this, we reset the mach task 2841 // signal handler that's placed on our process by CrashReporter. This disables 2842 // CrashReporter-based reporting. 2843 // 2844 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 2845 // on caught fatal signals. 2846 // 2847 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 2848 // handlers. By replacing the existing task exception handler, we disable gdb's mach 2849 // exception handling, while leaving the standard BSD signal handlers functional. 2850 kern_return_t kr; 2851 kr = task_set_exception_ports(mach_task_self(), 2852 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 2853 MACH_PORT_NULL, 2854 EXCEPTION_STATE_IDENTITY, 2855 MACHINE_THREAD_STATE); 2856 2857 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 2858 #endif 2859 2860 if (libjsig_is_loaded) { 2861 // Tell libjsig jvm finishes setting signal handlers 2862 (*end_signal_setting)(); 2863 } 2864 2865 // We don't activate signal checker if libjsig is in place, we trust ourselves 2866 // and if UserSignalHandler is installed all bets are off 2867 if (CheckJNICalls) { 2868 if (libjsig_is_loaded) { 2869 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled"); 2870 check_signals = false; 2871 } 2872 if (AllowUserSignalHandlers) { 2873 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 2874 check_signals = false; 2875 } 2876 } 2877 } 2878 } 2879 2880 2881 ///// 2882 // glibc on Bsd platform uses non-documented flag 2883 // to indicate, that some special sort of signal 2884 // trampoline is used. 2885 // We will never set this flag, and we should 2886 // ignore this flag in our diagnostic 2887 #ifdef SIGNIFICANT_SIGNAL_MASK 2888 #undef SIGNIFICANT_SIGNAL_MASK 2889 #endif 2890 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 2891 2892 static const char* get_signal_handler_name(address handler, 2893 char* buf, int buflen) { 2894 int offset; 2895 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2896 if (found) { 2897 // skip directory names 2898 const char *p1, *p2; 2899 p1 = buf; 2900 size_t len = strlen(os::file_separator()); 2901 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2902 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2903 } else { 2904 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2905 } 2906 return buf; 2907 } 2908 2909 static void print_signal_handler(outputStream* st, int sig, 2910 char* buf, size_t buflen) { 2911 struct sigaction sa; 2912 2913 sigaction(sig, NULL, &sa); 2914 2915 // See comment for SIGNIFICANT_SIGNAL_MASK define 2916 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 2917 2918 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2919 2920 address handler = (sa.sa_flags & SA_SIGINFO) 2921 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2922 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2923 2924 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2925 st->print("SIG_DFL"); 2926 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2927 st->print("SIG_IGN"); 2928 } else { 2929 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2930 } 2931 2932 st->print(", sa_mask[0]="); 2933 os::Posix::print_signal_set_short(st, &sa.sa_mask); 2934 2935 address rh = VMError::get_resetted_sighandler(sig); 2936 // May be, handler was resetted by VMError? 2937 if (rh != NULL) { 2938 handler = rh; 2939 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 2940 } 2941 2942 st->print(", sa_flags="); 2943 os::Posix::print_sa_flags(st, sa.sa_flags); 2944 2945 // Check: is it our handler? 2946 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 2947 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 2948 // It is our signal handler 2949 // check for flags, reset system-used one! 2950 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 2951 st->print( 2952 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2953 os::Bsd::get_our_sigflags(sig)); 2954 } 2955 } 2956 st->cr(); 2957 } 2958 2959 2960 #define DO_SIGNAL_CHECK(sig) \ 2961 do { \ 2962 if (!sigismember(&check_signal_done, sig)) { \ 2963 os::Bsd::check_signal_handler(sig); \ 2964 } \ 2965 } while (0) 2966 2967 // This method is a periodic task to check for misbehaving JNI applications 2968 // under CheckJNI, we can add any periodic checks here 2969 2970 void os::run_periodic_checks() { 2971 2972 if (check_signals == false) return; 2973 2974 // SEGV and BUS if overridden could potentially prevent 2975 // generation of hs*.log in the event of a crash, debugging 2976 // such a case can be very challenging, so we absolutely 2977 // check the following for a good measure: 2978 DO_SIGNAL_CHECK(SIGSEGV); 2979 DO_SIGNAL_CHECK(SIGILL); 2980 DO_SIGNAL_CHECK(SIGFPE); 2981 DO_SIGNAL_CHECK(SIGBUS); 2982 DO_SIGNAL_CHECK(SIGPIPE); 2983 DO_SIGNAL_CHECK(SIGXFSZ); 2984 2985 2986 // ReduceSignalUsage allows the user to override these handlers 2987 // see comments at the very top and jvm_md.h 2988 if (!ReduceSignalUsage) { 2989 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 2990 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 2991 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 2992 DO_SIGNAL_CHECK(BREAK_SIGNAL); 2993 } 2994 2995 DO_SIGNAL_CHECK(SR_signum); 2996 } 2997 2998 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 2999 3000 static os_sigaction_t os_sigaction = NULL; 3001 3002 void os::Bsd::check_signal_handler(int sig) { 3003 char buf[O_BUFLEN]; 3004 address jvmHandler = NULL; 3005 3006 3007 struct sigaction act; 3008 if (os_sigaction == NULL) { 3009 // only trust the default sigaction, in case it has been interposed 3010 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3011 if (os_sigaction == NULL) return; 3012 } 3013 3014 os_sigaction(sig, (struct sigaction*)NULL, &act); 3015 3016 3017 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3018 3019 address thisHandler = (act.sa_flags & SA_SIGINFO) 3020 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3021 : CAST_FROM_FN_PTR(address, act.sa_handler); 3022 3023 3024 switch (sig) { 3025 case SIGSEGV: 3026 case SIGBUS: 3027 case SIGFPE: 3028 case SIGPIPE: 3029 case SIGILL: 3030 case SIGXFSZ: 3031 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3032 break; 3033 3034 case SHUTDOWN1_SIGNAL: 3035 case SHUTDOWN2_SIGNAL: 3036 case SHUTDOWN3_SIGNAL: 3037 case BREAK_SIGNAL: 3038 jvmHandler = (address)user_handler(); 3039 break; 3040 3041 default: 3042 if (sig == SR_signum) { 3043 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3044 } else { 3045 return; 3046 } 3047 break; 3048 } 3049 3050 if (thisHandler != jvmHandler) { 3051 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3052 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3053 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3054 // No need to check this sig any longer 3055 sigaddset(&check_signal_done, sig); 3056 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3057 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3058 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3059 exception_name(sig, buf, O_BUFLEN)); 3060 } 3061 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3062 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3063 tty->print("expected:"); 3064 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3065 tty->cr(); 3066 tty->print(" found:"); 3067 os::Posix::print_sa_flags(tty, act.sa_flags); 3068 tty->cr(); 3069 // No need to check this sig any longer 3070 sigaddset(&check_signal_done, sig); 3071 } 3072 3073 // Dump all the signal 3074 if (sigismember(&check_signal_done, sig)) { 3075 print_signal_handlers(tty, buf, O_BUFLEN); 3076 } 3077 } 3078 3079 extern void report_error(char* file_name, int line_no, char* title, 3080 char* format, ...); 3081 3082 // this is called _before_ the most of global arguments have been parsed 3083 void os::init(void) { 3084 char dummy; // used to get a guess on initial stack address 3085 3086 clock_tics_per_sec = CLK_TCK; 3087 3088 init_random(1234567); 3089 3090 Bsd::set_page_size(getpagesize()); 3091 if (Bsd::page_size() == -1) { 3092 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3093 } 3094 init_page_sizes((size_t) Bsd::page_size()); 3095 3096 Bsd::initialize_system_info(); 3097 3098 // _main_thread points to the thread that created/loaded the JVM. 3099 Bsd::_main_thread = pthread_self(); 3100 3101 Bsd::clock_init(); 3102 initial_time_count = javaTimeNanos(); 3103 3104 os::Posix::init(); 3105 } 3106 3107 // To install functions for atexit system call 3108 extern "C" { 3109 static void perfMemory_exit_helper() { 3110 perfMemory_exit(); 3111 } 3112 } 3113 3114 // this is called _after_ the global arguments have been parsed 3115 jint os::init_2(void) { 3116 3117 // This could be set after os::Posix::init() but all platforms 3118 // have to set it the same so we have to mirror Solaris. 3119 DEBUG_ONLY(os::set_mutex_init_done();) 3120 3121 os::Posix::init_2(); 3122 3123 // initialize suspend/resume support - must do this before signal_sets_init() 3124 if (SR_initialize() != 0) { 3125 perror("SR_initialize failed"); 3126 return JNI_ERR; 3127 } 3128 3129 Bsd::signal_sets_init(); 3130 Bsd::install_signal_handlers(); 3131 // Initialize data for jdk.internal.misc.Signal 3132 if (!ReduceSignalUsage) { 3133 jdk_misc_signal_init(); 3134 } 3135 3136 // Check and sets minimum stack sizes against command line options 3137 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3138 return JNI_ERR; 3139 } 3140 3141 if (MaxFDLimit) { 3142 // set the number of file descriptors to max. print out error 3143 // if getrlimit/setrlimit fails but continue regardless. 3144 struct rlimit nbr_files; 3145 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3146 if (status != 0) { 3147 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3148 } else { 3149 nbr_files.rlim_cur = nbr_files.rlim_max; 3150 3151 #ifdef __APPLE__ 3152 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3153 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3154 // be used instead 3155 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3156 #endif 3157 3158 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3159 if (status != 0) { 3160 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3161 } 3162 } 3163 } 3164 3165 // at-exit methods are called in the reverse order of their registration. 3166 // atexit functions are called on return from main or as a result of a 3167 // call to exit(3C). There can be only 32 of these functions registered 3168 // and atexit() does not set errno. 3169 3170 if (PerfAllowAtExitRegistration) { 3171 // only register atexit functions if PerfAllowAtExitRegistration is set. 3172 // atexit functions can be delayed until process exit time, which 3173 // can be problematic for embedded VM situations. Embedded VMs should 3174 // call DestroyJavaVM() to assure that VM resources are released. 3175 3176 // note: perfMemory_exit_helper atexit function may be removed in 3177 // the future if the appropriate cleanup code can be added to the 3178 // VM_Exit VMOperation's doit method. 3179 if (atexit(perfMemory_exit_helper) != 0) { 3180 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3181 } 3182 } 3183 3184 // initialize thread priority policy 3185 prio_init(); 3186 3187 #ifdef __APPLE__ 3188 // dynamically link to objective c gc registration 3189 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3190 if (handleLibObjc != NULL) { 3191 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3192 } 3193 #endif 3194 3195 return JNI_OK; 3196 } 3197 3198 // Mark the polling page as unreadable 3199 void os::make_polling_page_unreadable(void) { 3200 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3201 fatal("Could not disable polling page"); 3202 } 3203 } 3204 3205 // Mark the polling page as readable 3206 void os::make_polling_page_readable(void) { 3207 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3208 fatal("Could not enable polling page"); 3209 } 3210 } 3211 3212 int os::active_processor_count() { 3213 // User has overridden the number of active processors 3214 if (ActiveProcessorCount > 0) { 3215 log_trace(os)("active_processor_count: " 3216 "active processor count set by user : %d", 3217 ActiveProcessorCount); 3218 return ActiveProcessorCount; 3219 } 3220 3221 return _processor_count; 3222 } 3223 3224 #ifdef __APPLE__ 3225 static volatile int* volatile apic_to_processor_mapping = NULL; 3226 static volatile int next_processor_id = 0; 3227 3228 static inline volatile int* get_apic_to_processor_mapping() { 3229 volatile int* mapping = Atomic::load_acquire(&apic_to_processor_mapping); 3230 if (mapping == NULL) { 3231 // Calculate possible number space for APIC ids. This space is not necessarily 3232 // in the range [0, number_of_processors). 3233 uint total_bits = 0; 3234 for (uint i = 0;; ++i) { 3235 uint eax = 0xb; // Query topology leaf 3236 uint ebx; 3237 uint ecx = i; 3238 uint edx; 3239 3240 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : ); 3241 3242 uint level_type = (ecx >> 8) & 0xFF; 3243 if (level_type == 0) { 3244 // Invalid level; end of topology 3245 break; 3246 } 3247 uint level_apic_id_shift = eax & ((1u << 5) - 1); 3248 total_bits += level_apic_id_shift; 3249 } 3250 3251 uint max_apic_ids = 1u << total_bits; 3252 mapping = NEW_C_HEAP_ARRAY(int, max_apic_ids, mtInternal); 3253 3254 for (uint i = 0; i < max_apic_ids; ++i) { 3255 mapping[i] = -1; 3256 } 3257 3258 if (!Atomic::replace_if_null(&apic_to_processor_mapping, mapping)) { 3259 FREE_C_HEAP_ARRAY(int, mapping); 3260 mapping = Atomic::load_acquire(&apic_to_processor_mapping); 3261 } 3262 } 3263 3264 return mapping; 3265 } 3266 3267 uint os::processor_id() { 3268 volatile int* mapping = get_apic_to_processor_mapping(); 3269 3270 uint eax = 0xb; 3271 uint ebx; 3272 uint ecx = 0; 3273 uint edx; 3274 3275 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : ); 3276 3277 // Map from APIC id to a unique logical processor ID in the expected 3278 // [0, num_processors) range. 3279 3280 uint apic_id = edx; 3281 int processor_id = Atomic::load(&mapping[apic_id]); 3282 3283 while (processor_id < 0) { 3284 if (Atomic::cmpxchg(&mapping[apic_id], -1, -2) == -1) { 3285 Atomic::store(&mapping[apic_id], Atomic::add(&next_processor_id, 1) - 1); 3286 } 3287 processor_id = Atomic::load(&mapping[apic_id]); 3288 } 3289 3290 assert(processor_id >= 0 && processor_id < os::processor_count(), "invalid processor id"); 3291 3292 return (uint)processor_id; 3293 } 3294 #endif 3295 3296 void os::set_native_thread_name(const char *name) { 3297 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3298 // This is only supported in Snow Leopard and beyond 3299 if (name != NULL) { 3300 // Add a "Java: " prefix to the name 3301 char buf[MAXTHREADNAMESIZE]; 3302 snprintf(buf, sizeof(buf), "Java: %s", name); 3303 pthread_setname_np(buf); 3304 } 3305 #endif 3306 } 3307 3308 bool os::bind_to_processor(uint processor_id) { 3309 // Not yet implemented. 3310 return false; 3311 } 3312 3313 void os::SuspendedThreadTask::internal_do_task() { 3314 if (do_suspend(_thread->osthread())) { 3315 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3316 do_task(context); 3317 do_resume(_thread->osthread()); 3318 } 3319 } 3320 3321 //////////////////////////////////////////////////////////////////////////////// 3322 // debug support 3323 3324 bool os::find(address addr, outputStream* st) { 3325 Dl_info dlinfo; 3326 memset(&dlinfo, 0, sizeof(dlinfo)); 3327 if (dladdr(addr, &dlinfo) != 0) { 3328 st->print(INTPTR_FORMAT ": ", (intptr_t)addr); 3329 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3330 st->print("%s+%#x", dlinfo.dli_sname, 3331 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr)); 3332 } else if (dlinfo.dli_fbase != NULL) { 3333 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase)); 3334 } else { 3335 st->print("<absolute address>"); 3336 } 3337 if (dlinfo.dli_fname != NULL) { 3338 st->print(" in %s", dlinfo.dli_fname); 3339 } 3340 if (dlinfo.dli_fbase != NULL) { 3341 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase); 3342 } 3343 st->cr(); 3344 3345 if (Verbose) { 3346 // decode some bytes around the PC 3347 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3348 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3349 address lowest = (address) dlinfo.dli_sname; 3350 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3351 if (begin < lowest) begin = lowest; 3352 Dl_info dlinfo2; 3353 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3354 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3355 end = (address) dlinfo2.dli_saddr; 3356 } 3357 Disassembler::decode(begin, end, st); 3358 } 3359 return true; 3360 } 3361 return false; 3362 } 3363 3364 //////////////////////////////////////////////////////////////////////////////// 3365 // misc 3366 3367 // This does not do anything on Bsd. This is basically a hook for being 3368 // able to use structured exception handling (thread-local exception filters) 3369 // on, e.g., Win32. 3370 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3371 const methodHandle& method, JavaCallArguments* args, 3372 Thread* thread) { 3373 f(value, method, args, thread); 3374 } 3375 3376 void os::print_statistics() { 3377 } 3378 3379 bool os::message_box(const char* title, const char* message) { 3380 int i; 3381 fdStream err(defaultStream::error_fd()); 3382 for (i = 0; i < 78; i++) err.print_raw("="); 3383 err.cr(); 3384 err.print_raw_cr(title); 3385 for (i = 0; i < 78; i++) err.print_raw("-"); 3386 err.cr(); 3387 err.print_raw_cr(message); 3388 for (i = 0; i < 78; i++) err.print_raw("="); 3389 err.cr(); 3390 3391 char buf[16]; 3392 // Prevent process from exiting upon "read error" without consuming all CPU 3393 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3394 3395 return buf[0] == 'y' || buf[0] == 'Y'; 3396 } 3397 3398 static inline struct timespec get_mtime(const char* filename) { 3399 struct stat st; 3400 int ret = os::stat(filename, &st); 3401 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 3402 #ifdef __APPLE__ 3403 return st.st_mtimespec; 3404 #else 3405 return st.st_mtim; 3406 #endif 3407 } 3408 3409 int os::compare_file_modified_times(const char* file1, const char* file2) { 3410 struct timespec filetime1 = get_mtime(file1); 3411 struct timespec filetime2 = get_mtime(file2); 3412 int diff = filetime1.tv_sec - filetime2.tv_sec; 3413 if (diff == 0) { 3414 return filetime1.tv_nsec - filetime2.tv_nsec; 3415 } 3416 return diff; 3417 } 3418 3419 // Is a (classpath) directory empty? 3420 bool os::dir_is_empty(const char* path) { 3421 DIR *dir = NULL; 3422 struct dirent *ptr; 3423 3424 dir = opendir(path); 3425 if (dir == NULL) return true; 3426 3427 // Scan the directory 3428 bool result = true; 3429 while (result && (ptr = readdir(dir)) != NULL) { 3430 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3431 result = false; 3432 } 3433 } 3434 closedir(dir); 3435 return result; 3436 } 3437 3438 // This code originates from JDK's sysOpen and open64_w 3439 // from src/solaris/hpi/src/system_md.c 3440 3441 int os::open(const char *path, int oflag, int mode) { 3442 if (strlen(path) > MAX_PATH - 1) { 3443 errno = ENAMETOOLONG; 3444 return -1; 3445 } 3446 int fd; 3447 3448 fd = ::open(path, oflag, mode); 3449 if (fd == -1) return -1; 3450 3451 // If the open succeeded, the file might still be a directory 3452 { 3453 struct stat buf; 3454 int ret = ::fstat(fd, &buf); 3455 int st_mode = buf.st_mode; 3456 3457 if (ret != -1) { 3458 if ((st_mode & S_IFMT) == S_IFDIR) { 3459 errno = EISDIR; 3460 ::close(fd); 3461 return -1; 3462 } 3463 } else { 3464 ::close(fd); 3465 return -1; 3466 } 3467 } 3468 3469 // All file descriptors that are opened in the JVM and not 3470 // specifically destined for a subprocess should have the 3471 // close-on-exec flag set. If we don't set it, then careless 3rd 3472 // party native code might fork and exec without closing all 3473 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3474 // UNIXProcess.c), and this in turn might: 3475 // 3476 // - cause end-of-file to fail to be detected on some file 3477 // descriptors, resulting in mysterious hangs, or 3478 // 3479 // - might cause an fopen in the subprocess to fail on a system 3480 // suffering from bug 1085341. 3481 // 3482 // (Yes, the default setting of the close-on-exec flag is a Unix 3483 // design flaw) 3484 // 3485 // See: 3486 // 1085341: 32-bit stdio routines should support file descriptors >255 3487 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3488 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3489 // 3490 #ifdef FD_CLOEXEC 3491 { 3492 int flags = ::fcntl(fd, F_GETFD); 3493 if (flags != -1) { 3494 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3495 } 3496 } 3497 #endif 3498 3499 return fd; 3500 } 3501 3502 3503 // create binary file, rewriting existing file if required 3504 int os::create_binary_file(const char* path, bool rewrite_existing) { 3505 int oflags = O_WRONLY | O_CREAT; 3506 if (!rewrite_existing) { 3507 oflags |= O_EXCL; 3508 } 3509 return ::open(path, oflags, S_IREAD | S_IWRITE); 3510 } 3511 3512 // return current position of file pointer 3513 jlong os::current_file_offset(int fd) { 3514 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3515 } 3516 3517 // move file pointer to the specified offset 3518 jlong os::seek_to_file_offset(int fd, jlong offset) { 3519 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3520 } 3521 3522 // This code originates from JDK's sysAvailable 3523 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3524 3525 int os::available(int fd, jlong *bytes) { 3526 jlong cur, end; 3527 int mode; 3528 struct stat buf; 3529 3530 if (::fstat(fd, &buf) >= 0) { 3531 mode = buf.st_mode; 3532 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3533 int n; 3534 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3535 *bytes = n; 3536 return 1; 3537 } 3538 } 3539 } 3540 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3541 return 0; 3542 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3543 return 0; 3544 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3545 return 0; 3546 } 3547 *bytes = end - cur; 3548 return 1; 3549 } 3550 3551 // Map a block of memory. 3552 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3553 char *addr, size_t bytes, bool read_only, 3554 bool allow_exec) { 3555 int prot; 3556 int flags; 3557 3558 if (read_only) { 3559 prot = PROT_READ; 3560 flags = MAP_SHARED; 3561 } else { 3562 prot = PROT_READ | PROT_WRITE; 3563 flags = MAP_PRIVATE; 3564 } 3565 3566 if (allow_exec) { 3567 prot |= PROT_EXEC; 3568 } 3569 3570 if (addr != NULL) { 3571 flags |= MAP_FIXED; 3572 } 3573 3574 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3575 fd, file_offset); 3576 if (mapped_address == MAP_FAILED) { 3577 return NULL; 3578 } 3579 return mapped_address; 3580 } 3581 3582 3583 // Remap a block of memory. 3584 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3585 char *addr, size_t bytes, bool read_only, 3586 bool allow_exec) { 3587 // same as map_memory() on this OS 3588 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3589 allow_exec); 3590 } 3591 3592 3593 // Unmap a block of memory. 3594 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3595 return munmap(addr, bytes) == 0; 3596 } 3597 3598 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3599 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3600 // of a thread. 3601 // 3602 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3603 // the fast estimate available on the platform. 3604 3605 jlong os::current_thread_cpu_time() { 3606 #ifdef __APPLE__ 3607 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3608 #else 3609 Unimplemented(); 3610 return 0; 3611 #endif 3612 } 3613 3614 jlong os::thread_cpu_time(Thread* thread) { 3615 #ifdef __APPLE__ 3616 return os::thread_cpu_time(thread, true /* user + sys */); 3617 #else 3618 Unimplemented(); 3619 return 0; 3620 #endif 3621 } 3622 3623 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3624 #ifdef __APPLE__ 3625 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3626 #else 3627 Unimplemented(); 3628 return 0; 3629 #endif 3630 } 3631 3632 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3633 #ifdef __APPLE__ 3634 struct thread_basic_info tinfo; 3635 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3636 kern_return_t kr; 3637 thread_t mach_thread; 3638 3639 mach_thread = thread->osthread()->thread_id(); 3640 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3641 if (kr != KERN_SUCCESS) { 3642 return -1; 3643 } 3644 3645 if (user_sys_cpu_time) { 3646 jlong nanos; 3647 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3648 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3649 return nanos; 3650 } else { 3651 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3652 } 3653 #else 3654 Unimplemented(); 3655 return 0; 3656 #endif 3657 } 3658 3659 3660 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3661 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3662 info_ptr->may_skip_backward = false; // elapsed time not wall time 3663 info_ptr->may_skip_forward = false; // elapsed time not wall time 3664 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3665 } 3666 3667 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3668 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3669 info_ptr->may_skip_backward = false; // elapsed time not wall time 3670 info_ptr->may_skip_forward = false; // elapsed time not wall time 3671 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3672 } 3673 3674 bool os::is_thread_cpu_time_supported() { 3675 #ifdef __APPLE__ 3676 return true; 3677 #else 3678 return false; 3679 #endif 3680 } 3681 3682 // System loadavg support. Returns -1 if load average cannot be obtained. 3683 // Bsd doesn't yet have a (official) notion of processor sets, 3684 // so just return the system wide load average. 3685 int os::loadavg(double loadavg[], int nelem) { 3686 return ::getloadavg(loadavg, nelem); 3687 } 3688 3689 void os::pause() { 3690 char filename[MAX_PATH]; 3691 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3692 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 3693 } else { 3694 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3695 } 3696 3697 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3698 if (fd != -1) { 3699 struct stat buf; 3700 ::close(fd); 3701 while (::stat(filename, &buf) == 0) { 3702 (void)::poll(NULL, 0, 100); 3703 } 3704 } else { 3705 jio_fprintf(stderr, 3706 "Could not open pause file '%s', continuing immediately.\n", filename); 3707 } 3708 } 3709 3710 // Darwin has no "environ" in a dynamic library. 3711 #ifdef __APPLE__ 3712 #include <crt_externs.h> 3713 #define environ (*_NSGetEnviron()) 3714 #else 3715 extern char** environ; 3716 #endif 3717 3718 // Run the specified command in a separate process. Return its exit value, 3719 // or -1 on failure (e.g. can't fork a new process). 3720 // Unlike system(), this function can be called from signal handler. It 3721 // doesn't block SIGINT et al. 3722 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 3723 const char * argv[4] = {"sh", "-c", cmd, NULL}; 3724 3725 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 3726 // pthread_atfork handlers and reset pthread library. All we need is a 3727 // separate process to execve. Make a direct syscall to fork process. 3728 // On IA64 there's no fork syscall, we have to use fork() and hope for 3729 // the best... 3730 pid_t pid = fork(); 3731 3732 if (pid < 0) { 3733 // fork failed 3734 return -1; 3735 3736 } else if (pid == 0) { 3737 // child process 3738 3739 // execve() in BsdThreads will call pthread_kill_other_threads_np() 3740 // first to kill every thread on the thread list. Because this list is 3741 // not reset by fork() (see notes above), execve() will instead kill 3742 // every thread in the parent process. We know this is the only thread 3743 // in the new process, so make a system call directly. 3744 // IA64 should use normal execve() from glibc to match the glibc fork() 3745 // above. 3746 execve("/bin/sh", (char* const*)argv, environ); 3747 3748 // execve failed 3749 _exit(-1); 3750 3751 } else { 3752 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 3753 // care about the actual exit code, for now. 3754 3755 int status; 3756 3757 // Wait for the child process to exit. This returns immediately if 3758 // the child has already exited. */ 3759 while (waitpid(pid, &status, 0) < 0) { 3760 switch (errno) { 3761 case ECHILD: return 0; 3762 case EINTR: break; 3763 default: return -1; 3764 } 3765 } 3766 3767 if (WIFEXITED(status)) { 3768 // The child exited normally; get its exit code. 3769 return WEXITSTATUS(status); 3770 } else if (WIFSIGNALED(status)) { 3771 // The child exited because of a signal 3772 // The best value to return is 0x80 + signal number, 3773 // because that is what all Unix shells do, and because 3774 // it allows callers to distinguish between process exit and 3775 // process death by signal. 3776 return 0x80 + WTERMSIG(status); 3777 } else { 3778 // Unknown exit code; pass it through 3779 return status; 3780 } 3781 } 3782 } 3783 3784 // Get the kern.corefile setting, or otherwise the default path to the core file 3785 // Returns the length of the string 3786 int os::get_core_path(char* buffer, size_t bufferSize) { 3787 int n = 0; 3788 #ifdef __APPLE__ 3789 char coreinfo[MAX_PATH]; 3790 size_t sz = sizeof(coreinfo); 3791 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0); 3792 if (ret == 0) { 3793 char *pid_pos = strstr(coreinfo, "%P"); 3794 // skip over the "%P" to preserve any optional custom user pattern 3795 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : ""; 3796 3797 if (pid_pos != NULL) { 3798 *pid_pos = '\0'; 3799 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail); 3800 } else { 3801 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo); 3802 } 3803 } else 3804 #endif 3805 { 3806 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id()); 3807 } 3808 // Truncate if theoretical string was longer than bufferSize 3809 n = MIN2(n, (int)bufferSize); 3810 3811 return n; 3812 } 3813 3814 bool os::supports_map_sync() { 3815 return false; 3816 } 3817 3818 #ifndef PRODUCT 3819 void TestReserveMemorySpecial_test() { 3820 // No tests available for this platform 3821 } 3822 #endif 3823 3824 bool os::start_debugging(char *buf, int buflen) { 3825 int len = (int)strlen(buf); 3826 char *p = &buf[len]; 3827 3828 jio_snprintf(p, buflen-len, 3829 "\n\n" 3830 "Do you want to debug the problem?\n\n" 3831 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 3832 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 3833 "Otherwise, press RETURN to abort...", 3834 os::current_process_id(), os::current_process_id(), 3835 os::current_thread_id(), os::current_thread_id()); 3836 3837 bool yes = os::message_box("Unexpected Error", buf); 3838 3839 if (yes) { 3840 // yes, user asked VM to launch debugger 3841 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 3842 os::current_process_id(), os::current_process_id()); 3843 3844 os::fork_and_exec(buf); 3845 yes = false; 3846 } 3847 return yes; 3848 }