1 /* 2 * Copyright (c) 1999, 2018, 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 "memory/allocation.inline.hpp" 37 #include "memory/filemap.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_bsd.inline.hpp" 40 #include "os_share_bsd.hpp" 41 #include "prims/jniFastGetField.hpp" 42 #include "prims/jvm_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/atomic.hpp" 45 #include "runtime/extendedPC.hpp" 46 #include "runtime/globals.hpp" 47 #include "runtime/interfaceSupport.inline.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/javaCalls.hpp" 50 #include "runtime/mutexLocker.hpp" 51 #include "runtime/objectMonitor.hpp" 52 #include "runtime/orderAccess.hpp" 53 #include "runtime/osThread.hpp" 54 #include "runtime/perfMemory.hpp" 55 #include "runtime/semaphore.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/statSampler.hpp" 58 #include "runtime/stubRoutines.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/threadCritical.hpp" 61 #include "runtime/timer.hpp" 62 #include "services/attachListener.hpp" 63 #include "services/memTracker.hpp" 64 #include "services/runtimeService.hpp" 65 #include "utilities/align.hpp" 66 #include "utilities/decoder.hpp" 67 #include "utilities/defaultStream.hpp" 68 #include "utilities/events.hpp" 69 #include "utilities/growableArray.hpp" 70 #include "utilities/vmError.hpp" 71 72 // put OS-includes here 73 # include <sys/types.h> 74 # include <sys/mman.h> 75 # include <sys/stat.h> 76 # include <sys/select.h> 77 # include <pthread.h> 78 # include <signal.h> 79 # include <errno.h> 80 # include <dlfcn.h> 81 # include <stdio.h> 82 # include <unistd.h> 83 # include <sys/resource.h> 84 # include <pthread.h> 85 # include <sys/stat.h> 86 # include <sys/time.h> 87 # include <sys/times.h> 88 # include <sys/utsname.h> 89 # include <sys/socket.h> 90 # include <sys/wait.h> 91 # include <time.h> 92 # include <pwd.h> 93 # include <poll.h> 94 # include <fcntl.h> 95 # include <string.h> 96 # include <sys/param.h> 97 # include <sys/sysctl.h> 98 # include <sys/ipc.h> 99 # include <sys/shm.h> 100 #ifndef __APPLE__ 101 # include <link.h> 102 #endif 103 # include <stdint.h> 104 # include <inttypes.h> 105 # include <sys/ioctl.h> 106 # include <sys/syscall.h> 107 108 #if defined(__FreeBSD__) || defined(__NetBSD__) 109 #include <elf.h> 110 #endif 111 112 #ifdef __APPLE__ 113 #include <mach/mach.h> // semaphore_* API 114 #include <mach-o/dyld.h> 115 #include <sys/proc_info.h> 116 #include <objc/objc-auto.h> 117 #endif 118 119 #ifndef MAP_ANONYMOUS 120 #define MAP_ANONYMOUS MAP_ANON 121 #endif 122 123 #define MAX_PATH (2 * K) 124 125 // for timer info max values which include all bits 126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 127 128 #define LARGEPAGES_BIT (1 << 6) 129 130 //////////////////////////////////////////////////////////////////////////////// 131 // global variables 132 julong os::Bsd::_physical_memory = 0; 133 134 #ifdef __APPLE__ 135 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; 136 volatile uint64_t os::Bsd::_max_abstime = 0; 137 #else 138 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 139 #endif 140 pthread_t os::Bsd::_main_thread; 141 int os::Bsd::_page_size = -1; 142 143 static jlong initial_time_count=0; 144 145 static int clock_tics_per_sec = 100; 146 147 // For diagnostics to print a message once. see run_periodic_checks 148 static sigset_t check_signal_done; 149 static bool check_signals = true; 150 151 static pid_t _initial_pid = 0; 152 153 // Signal number used to suspend/resume a thread 154 155 // do not use any signal number less than SIGSEGV, see 4355769 156 static int SR_signum = SIGUSR2; 157 sigset_t SR_sigset; 158 159 160 //////////////////////////////////////////////////////////////////////////////// 161 // utility functions 162 163 static int SR_initialize(); 164 165 julong os::available_memory() { 166 return Bsd::available_memory(); 167 } 168 169 // available here means free 170 julong os::Bsd::available_memory() { 171 uint64_t available = physical_memory() >> 2; 172 #ifdef __APPLE__ 173 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; 174 vm_statistics64_data_t vmstat; 175 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, 176 (host_info64_t)&vmstat, &count); 177 assert(kerr == KERN_SUCCESS, 178 "host_statistics64 failed - check mach_host_self() and count"); 179 if (kerr == KERN_SUCCESS) { 180 available = vmstat.free_count * os::vm_page_size(); 181 } 182 #endif 183 return available; 184 } 185 186 julong os::physical_memory() { 187 return Bsd::physical_memory(); 188 } 189 190 // Return true if user is running as root. 191 192 bool os::have_special_privileges() { 193 static bool init = false; 194 static bool privileges = false; 195 if (!init) { 196 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 197 init = true; 198 } 199 return privileges; 200 } 201 202 203 204 // Cpu architecture string 205 #if defined(ZERO) 206 static char cpu_arch[] = ZERO_LIBARCH; 207 #elif defined(IA64) 208 static char cpu_arch[] = "ia64"; 209 #elif defined(IA32) 210 static char cpu_arch[] = "i386"; 211 #elif defined(AMD64) 212 static char cpu_arch[] = "amd64"; 213 #elif defined(ARM) 214 static char cpu_arch[] = "arm"; 215 #elif defined(PPC32) 216 static char cpu_arch[] = "ppc"; 217 #elif defined(SPARC) 218 #ifdef _LP64 219 static char cpu_arch[] = "sparcv9"; 220 #else 221 static char cpu_arch[] = "sparc"; 222 #endif 223 #else 224 #error Add appropriate cpu_arch setting 225 #endif 226 227 // Compiler variant 228 #ifdef COMPILER2 229 #define COMPILER_VARIANT "server" 230 #else 231 #define COMPILER_VARIANT "client" 232 #endif 233 234 235 void os::Bsd::initialize_system_info() { 236 int mib[2]; 237 size_t len; 238 int cpu_val; 239 julong mem_val; 240 241 // get processors count via hw.ncpus sysctl 242 mib[0] = CTL_HW; 243 mib[1] = HW_NCPU; 244 len = sizeof(cpu_val); 245 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 246 assert(len == sizeof(cpu_val), "unexpected data size"); 247 set_processor_count(cpu_val); 248 } else { 249 set_processor_count(1); // fallback 250 } 251 252 // get physical memory via hw.memsize sysctl (hw.memsize is used 253 // since it returns a 64 bit value) 254 mib[0] = CTL_HW; 255 256 #if defined (HW_MEMSIZE) // Apple 257 mib[1] = HW_MEMSIZE; 258 #elif defined(HW_PHYSMEM) // Most of BSD 259 mib[1] = HW_PHYSMEM; 260 #elif defined(HW_REALMEM) // Old FreeBSD 261 mib[1] = HW_REALMEM; 262 #else 263 #error No ways to get physmem 264 #endif 265 266 len = sizeof(mem_val); 267 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 268 assert(len == sizeof(mem_val), "unexpected data size"); 269 _physical_memory = mem_val; 270 } else { 271 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?) 272 } 273 274 #ifdef __OpenBSD__ 275 { 276 // limit _physical_memory memory view on OpenBSD since 277 // datasize rlimit restricts us anyway. 278 struct rlimit limits; 279 getrlimit(RLIMIT_DATA, &limits); 280 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 281 } 282 #endif 283 } 284 285 #ifdef __APPLE__ 286 static const char *get_home() { 287 const char *home_dir = ::getenv("HOME"); 288 if ((home_dir == NULL) || (*home_dir == '\0')) { 289 struct passwd *passwd_info = getpwuid(geteuid()); 290 if (passwd_info != NULL) { 291 home_dir = passwd_info->pw_dir; 292 } 293 } 294 295 return home_dir; 296 } 297 #endif 298 299 void os::init_system_properties_values() { 300 // The next steps are taken in the product version: 301 // 302 // Obtain the JAVA_HOME value from the location of libjvm.so. 303 // This library should be located at: 304 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 305 // 306 // If "/jre/lib/" appears at the right place in the path, then we 307 // assume libjvm.so is installed in a JDK and we use this path. 308 // 309 // Otherwise exit with message: "Could not create the Java virtual machine." 310 // 311 // The following extra steps are taken in the debugging version: 312 // 313 // If "/jre/lib/" does NOT appear at the right place in the path 314 // instead of exit check for $JAVA_HOME environment variable. 315 // 316 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 317 // then we append a fake suffix "hotspot/libjvm.so" to this path so 318 // it looks like libjvm.so is installed there 319 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 320 // 321 // Otherwise exit. 322 // 323 // Important note: if the location of libjvm.so changes this 324 // code needs to be changed accordingly. 325 326 // See ld(1): 327 // The linker uses the following search paths to locate required 328 // shared libraries: 329 // 1: ... 330 // ... 331 // 7: The default directories, normally /lib and /usr/lib. 332 #ifndef DEFAULT_LIBPATH 333 #define DEFAULT_LIBPATH "/lib:/usr/lib" 334 #endif 335 336 // Base path of extensions installed on the system. 337 #define SYS_EXT_DIR "/usr/java/packages" 338 #define EXTENSIONS_DIR "/lib/ext" 339 340 #ifndef __APPLE__ 341 342 // Buffer that fits several sprintfs. 343 // Note that the space for the colon and the trailing null are provided 344 // by the nulls included by the sizeof operator. 345 const size_t bufsize = 346 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 347 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 348 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 349 350 // sysclasspath, java_home, dll_dir 351 { 352 char *pslash; 353 os::jvm_path(buf, bufsize); 354 355 // Found the full path to libjvm.so. 356 // Now cut the path to <java_home>/jre if we can. 357 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 358 pslash = strrchr(buf, '/'); 359 if (pslash != NULL) { 360 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 361 } 362 Arguments::set_dll_dir(buf); 363 364 if (pslash != NULL) { 365 pslash = strrchr(buf, '/'); 366 if (pslash != NULL) { 367 *pslash = '\0'; // Get rid of /<arch>. 368 pslash = strrchr(buf, '/'); 369 if (pslash != NULL) { 370 *pslash = '\0'; // Get rid of /lib. 371 } 372 } 373 } 374 Arguments::set_java_home(buf); 375 set_boot_path('/', ':'); 376 } 377 378 // Where to look for native libraries. 379 // 380 // Note: Due to a legacy implementation, most of the library path 381 // is set in the launcher. This was to accomodate linking restrictions 382 // on legacy Bsd implementations (which are no longer supported). 383 // Eventually, all the library path setting will be done here. 384 // 385 // However, to prevent the proliferation of improperly built native 386 // libraries, the new path component /usr/java/packages is added here. 387 // Eventually, all the library path setting will be done here. 388 { 389 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 390 // should always exist (until the legacy problem cited above is 391 // addressed). 392 const char *v = ::getenv("LD_LIBRARY_PATH"); 393 const char *v_colon = ":"; 394 if (v == NULL) { v = ""; v_colon = ""; } 395 // That's +1 for the colon and +1 for the trailing '\0'. 396 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 397 strlen(v) + 1 + 398 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, 399 mtInternal); 400 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); 401 Arguments::set_library_path(ld_library_path); 402 FREE_C_HEAP_ARRAY(char, ld_library_path); 403 } 404 405 // Extensions directories. 406 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 407 Arguments::set_ext_dirs(buf); 408 409 FREE_C_HEAP_ARRAY(char, buf); 410 411 #else // __APPLE__ 412 413 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 414 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 415 416 const char *user_home_dir = get_home(); 417 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. 418 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 419 sizeof(SYS_EXTENSIONS_DIRS); 420 421 // Buffer that fits several sprintfs. 422 // Note that the space for the colon and the trailing null are provided 423 // by the nulls included by the sizeof operator. 424 const size_t bufsize = 425 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends. 426 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir 427 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 428 429 // sysclasspath, java_home, dll_dir 430 { 431 char *pslash; 432 os::jvm_path(buf, bufsize); 433 434 // Found the full path to libjvm.so. 435 // Now cut the path to <java_home>/jre if we can. 436 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 437 pslash = strrchr(buf, '/'); 438 if (pslash != NULL) { 439 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 440 } 441 #ifdef STATIC_BUILD 442 strcat(buf, "/lib"); 443 #endif 444 445 Arguments::set_dll_dir(buf); 446 447 if (pslash != NULL) { 448 pslash = strrchr(buf, '/'); 449 if (pslash != NULL) { 450 *pslash = '\0'; // Get rid of /lib. 451 } 452 } 453 Arguments::set_java_home(buf); 454 set_boot_path('/', ':'); 455 } 456 457 // Where to look for native libraries. 458 // 459 // Note: Due to a legacy implementation, most of the library path 460 // is set in the launcher. This was to accomodate linking restrictions 461 // on legacy Bsd implementations (which are no longer supported). 462 // Eventually, all the library path setting will be done here. 463 // 464 // However, to prevent the proliferation of improperly built native 465 // libraries, the new path component /usr/java/packages is added here. 466 // Eventually, all the library path setting will be done here. 467 { 468 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 469 // should always exist (until the legacy problem cited above is 470 // addressed). 471 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code 472 // can specify a directory inside an app wrapper 473 const char *l = ::getenv("JAVA_LIBRARY_PATH"); 474 const char *l_colon = ":"; 475 if (l == NULL) { l = ""; l_colon = ""; } 476 477 const char *v = ::getenv("DYLD_LIBRARY_PATH"); 478 const char *v_colon = ":"; 479 if (v == NULL) { v = ""; v_colon = ""; } 480 481 // Apple's Java6 has "." at the beginning of java.library.path. 482 // OpenJDK on Windows has "." at the end of java.library.path. 483 // OpenJDK on Linux and Solaris don't have "." in java.library.path 484 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 485 // "." is appended to the end of java.library.path. Yes, this 486 // could cause a change in behavior, but Apple's Java6 behavior 487 // can be achieved by putting "." at the beginning of the 488 // JAVA_LIBRARY_PATH environment variable. 489 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 490 strlen(v) + 1 + strlen(l) + 1 + 491 system_ext_size + 3, 492 mtInternal); 493 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", 494 v, v_colon, l, l_colon, user_home_dir); 495 Arguments::set_library_path(ld_library_path); 496 FREE_C_HEAP_ARRAY(char, ld_library_path); 497 } 498 499 // Extensions directories. 500 // 501 // Note that the space for the colon and the trailing null are provided 502 // by the nulls included by the sizeof operator (so actually one byte more 503 // than necessary is allocated). 504 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, 505 user_home_dir, Arguments::get_java_home()); 506 Arguments::set_ext_dirs(buf); 507 508 FREE_C_HEAP_ARRAY(char, buf); 509 510 #undef SYS_EXTENSIONS_DIR 511 #undef SYS_EXTENSIONS_DIRS 512 513 #endif // __APPLE__ 514 515 #undef SYS_EXT_DIR 516 #undef EXTENSIONS_DIR 517 } 518 519 //////////////////////////////////////////////////////////////////////////////// 520 // breakpoint support 521 522 void os::breakpoint() { 523 BREAKPOINT; 524 } 525 526 extern "C" void breakpoint() { 527 // use debugger to set breakpoint here 528 } 529 530 //////////////////////////////////////////////////////////////////////////////// 531 // signal support 532 533 debug_only(static bool signal_sets_initialized = false); 534 static sigset_t unblocked_sigs, vm_sigs; 535 536 void os::Bsd::signal_sets_init() { 537 // Should also have an assertion stating we are still single-threaded. 538 assert(!signal_sets_initialized, "Already initialized"); 539 // Fill in signals that are necessarily unblocked for all threads in 540 // the VM. Currently, we unblock the following signals: 541 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 542 // by -Xrs (=ReduceSignalUsage)); 543 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 544 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 545 // the dispositions or masks wrt these signals. 546 // Programs embedding the VM that want to use the above signals for their 547 // own purposes must, at this time, use the "-Xrs" option to prevent 548 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 549 // (See bug 4345157, and other related bugs). 550 // In reality, though, unblocking these signals is really a nop, since 551 // these signals are not blocked by default. 552 sigemptyset(&unblocked_sigs); 553 sigaddset(&unblocked_sigs, SIGILL); 554 sigaddset(&unblocked_sigs, SIGSEGV); 555 sigaddset(&unblocked_sigs, SIGBUS); 556 sigaddset(&unblocked_sigs, SIGFPE); 557 sigaddset(&unblocked_sigs, SR_signum); 558 559 if (!ReduceSignalUsage) { 560 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 561 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 562 563 } 564 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 565 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 566 } 567 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 568 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 569 } 570 } 571 // Fill in signals that are blocked by all but the VM thread. 572 sigemptyset(&vm_sigs); 573 if (!ReduceSignalUsage) { 574 sigaddset(&vm_sigs, BREAK_SIGNAL); 575 } 576 debug_only(signal_sets_initialized = true); 577 578 } 579 580 // These are signals that are unblocked while a thread is running Java. 581 // (For some reason, they get blocked by default.) 582 sigset_t* os::Bsd::unblocked_signals() { 583 assert(signal_sets_initialized, "Not initialized"); 584 return &unblocked_sigs; 585 } 586 587 // These are the signals that are blocked while a (non-VM) thread is 588 // running Java. Only the VM thread handles these signals. 589 sigset_t* os::Bsd::vm_signals() { 590 assert(signal_sets_initialized, "Not initialized"); 591 return &vm_sigs; 592 } 593 594 void os::Bsd::hotspot_sigmask(Thread* thread) { 595 596 //Save caller's signal mask before setting VM signal mask 597 sigset_t caller_sigmask; 598 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 599 600 OSThread* osthread = thread->osthread(); 601 osthread->set_caller_sigmask(caller_sigmask); 602 603 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 604 605 if (!ReduceSignalUsage) { 606 if (thread->is_VM_thread()) { 607 // Only the VM thread handles BREAK_SIGNAL ... 608 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 609 } else { 610 // ... all other threads block BREAK_SIGNAL 611 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 612 } 613 } 614 } 615 616 617 ////////////////////////////////////////////////////////////////////////////// 618 // create new thread 619 620 #ifdef __APPLE__ 621 // library handle for calling objc_registerThreadWithCollector() 622 // without static linking to the libobjc library 623 #define OBJC_LIB "/usr/lib/libobjc.dylib" 624 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 625 typedef void (*objc_registerThreadWithCollector_t)(); 626 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 627 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 628 #endif 629 630 #ifdef __APPLE__ 631 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 632 // Additional thread_id used to correlate threads in SA 633 thread_identifier_info_data_t m_ident_info; 634 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 635 636 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 637 (thread_info_t) &m_ident_info, &count); 638 639 return m_ident_info.thread_id; 640 } 641 #endif 642 643 // Thread start routine for all newly created threads 644 static void *thread_native_entry(Thread *thread) { 645 // Try to randomize the cache line index of hot stack frames. 646 // This helps when threads of the same stack traces evict each other's 647 // cache lines. The threads can be either from the same JVM instance, or 648 // from different JVM instances. The benefit is especially true for 649 // processors with hyperthreading technology. 650 static int counter = 0; 651 int pid = os::current_process_id(); 652 alloca(((pid ^ counter++) & 7) * 128); 653 654 thread->initialize_thread_current(); 655 656 OSThread* osthread = thread->osthread(); 657 Monitor* sync = osthread->startThread_lock(); 658 659 osthread->set_thread_id(os::Bsd::gettid()); 660 661 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 662 os::current_thread_id(), (uintx) pthread_self()); 663 664 #ifdef __APPLE__ 665 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 666 guarantee(unique_thread_id != 0, "unique thread id was not found"); 667 osthread->set_unique_thread_id(unique_thread_id); 668 #endif 669 // initialize signal mask for this thread 670 os::Bsd::hotspot_sigmask(thread); 671 672 // initialize floating point control register 673 os::Bsd::init_thread_fpu_state(); 674 675 #ifdef __APPLE__ 676 // register thread with objc gc 677 if (objc_registerThreadWithCollectorFunction != NULL) { 678 objc_registerThreadWithCollectorFunction(); 679 } 680 #endif 681 682 // handshaking with parent thread 683 { 684 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 685 686 // notify parent thread 687 osthread->set_state(INITIALIZED); 688 sync->notify_all(); 689 690 // wait until os::start_thread() 691 while (osthread->get_state() == INITIALIZED) { 692 sync->wait(Mutex::_no_safepoint_check_flag); 693 } 694 } 695 696 // call one more level start routine 697 thread->run(); 698 699 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 700 os::current_thread_id(), (uintx) pthread_self()); 701 702 // If a thread has not deleted itself ("delete this") as part of its 703 // termination sequence, we have to ensure thread-local-storage is 704 // cleared before we actually terminate. No threads should ever be 705 // deleted asynchronously with respect to their termination. 706 if (Thread::current_or_null_safe() != NULL) { 707 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 708 thread->clear_thread_current(); 709 } 710 711 return 0; 712 } 713 714 bool os::create_thread(Thread* thread, ThreadType thr_type, 715 size_t req_stack_size) { 716 assert(thread->osthread() == NULL, "caller responsible"); 717 718 // Allocate the OSThread object 719 OSThread* osthread = new OSThread(NULL, NULL); 720 if (osthread == NULL) { 721 return false; 722 } 723 724 // set the correct thread state 725 osthread->set_thread_type(thr_type); 726 727 // Initial state is ALLOCATED but not INITIALIZED 728 osthread->set_state(ALLOCATED); 729 730 thread->set_osthread(osthread); 731 732 // init thread attributes 733 pthread_attr_t attr; 734 pthread_attr_init(&attr); 735 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 736 737 // calculate stack size if it's not specified by caller 738 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 739 int status = pthread_attr_setstacksize(&attr, stack_size); 740 assert_status(status == 0, status, "pthread_attr_setstacksize"); 741 742 ThreadState state; 743 744 { 745 pthread_t tid; 746 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 747 748 char buf[64]; 749 if (ret == 0) { 750 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 751 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 752 } else { 753 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 754 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 755 } 756 757 pthread_attr_destroy(&attr); 758 759 if (ret != 0) { 760 // Need to clean up stuff we've allocated so far 761 thread->set_osthread(NULL); 762 delete osthread; 763 return false; 764 } 765 766 // Store pthread info into the OSThread 767 osthread->set_pthread_id(tid); 768 769 // Wait until child thread is either initialized or aborted 770 { 771 Monitor* sync_with_child = osthread->startThread_lock(); 772 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 773 while ((state = osthread->get_state()) == ALLOCATED) { 774 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 775 } 776 } 777 778 } 779 780 // Aborted due to thread limit being reached 781 if (state == ZOMBIE) { 782 thread->set_osthread(NULL); 783 delete osthread; 784 return false; 785 } 786 787 // The thread is returned suspended (in state INITIALIZED), 788 // and is started higher up in the call chain 789 assert(state == INITIALIZED, "race condition"); 790 return true; 791 } 792 793 ///////////////////////////////////////////////////////////////////////////// 794 // attach existing thread 795 796 // bootstrap the main thread 797 bool os::create_main_thread(JavaThread* thread) { 798 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 799 return create_attached_thread(thread); 800 } 801 802 bool os::create_attached_thread(JavaThread* thread) { 803 #ifdef ASSERT 804 thread->verify_not_published(); 805 #endif 806 807 // Allocate the OSThread object 808 OSThread* osthread = new OSThread(NULL, NULL); 809 810 if (osthread == NULL) { 811 return false; 812 } 813 814 osthread->set_thread_id(os::Bsd::gettid()); 815 816 // Store pthread info into the OSThread 817 #ifdef __APPLE__ 818 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 819 guarantee(unique_thread_id != 0, "just checking"); 820 osthread->set_unique_thread_id(unique_thread_id); 821 #endif 822 osthread->set_pthread_id(::pthread_self()); 823 824 // initialize floating point control register 825 os::Bsd::init_thread_fpu_state(); 826 827 // Initial thread state is RUNNABLE 828 osthread->set_state(RUNNABLE); 829 830 thread->set_osthread(osthread); 831 832 // initialize signal mask for this thread 833 // and save the caller's signal mask 834 os::Bsd::hotspot_sigmask(thread); 835 836 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 837 os::current_thread_id(), (uintx) pthread_self()); 838 839 return true; 840 } 841 842 void os::pd_start_thread(Thread* thread) { 843 OSThread * osthread = thread->osthread(); 844 assert(osthread->get_state() != INITIALIZED, "just checking"); 845 Monitor* sync_with_child = osthread->startThread_lock(); 846 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 847 sync_with_child->notify(); 848 } 849 850 // Free Bsd resources related to the OSThread 851 void os::free_thread(OSThread* osthread) { 852 assert(osthread != NULL, "osthread not set"); 853 854 // We are told to free resources of the argument thread, 855 // but we can only really operate on the current thread. 856 assert(Thread::current()->osthread() == osthread, 857 "os::free_thread but not current thread"); 858 859 // Restore caller's signal mask 860 sigset_t sigmask = osthread->caller_sigmask(); 861 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 862 863 delete osthread; 864 } 865 866 //////////////////////////////////////////////////////////////////////////////// 867 // time support 868 869 // Time since start-up in seconds to a fine granularity. 870 // Used by VMSelfDestructTimer and the MemProfiler. 871 double os::elapsedTime() { 872 873 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 874 } 875 876 jlong os::elapsed_counter() { 877 return javaTimeNanos() - initial_time_count; 878 } 879 880 jlong os::elapsed_frequency() { 881 return NANOSECS_PER_SEC; // nanosecond resolution 882 } 883 884 bool os::supports_vtime() { return true; } 885 bool os::enable_vtime() { return false; } 886 bool os::vtime_enabled() { return false; } 887 888 double os::elapsedVTime() { 889 // better than nothing, but not much 890 return elapsedTime(); 891 } 892 893 jlong os::javaTimeMillis() { 894 timeval time; 895 int status = gettimeofday(&time, NULL); 896 assert(status != -1, "bsd error"); 897 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 898 } 899 900 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 901 timeval time; 902 int status = gettimeofday(&time, NULL); 903 assert(status != -1, "bsd error"); 904 seconds = jlong(time.tv_sec); 905 nanos = jlong(time.tv_usec) * 1000; 906 } 907 908 #ifndef __APPLE__ 909 #ifndef CLOCK_MONOTONIC 910 #define CLOCK_MONOTONIC (1) 911 #endif 912 #endif 913 914 #ifdef __APPLE__ 915 void os::Bsd::clock_init() { 916 mach_timebase_info(&_timebase_info); 917 } 918 #else 919 void os::Bsd::clock_init() { 920 struct timespec res; 921 struct timespec tp; 922 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 923 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 924 // yes, monotonic clock is supported 925 _clock_gettime = ::clock_gettime; 926 } 927 } 928 #endif 929 930 931 932 #ifdef __APPLE__ 933 934 jlong os::javaTimeNanos() { 935 const uint64_t tm = mach_absolute_time(); 936 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 937 const uint64_t prev = Bsd::_max_abstime; 938 if (now <= prev) { 939 return prev; // same or retrograde time; 940 } 941 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev); 942 assert(obsv >= prev, "invariant"); // Monotonicity 943 // If the CAS succeeded then we're done and return "now". 944 // If the CAS failed and the observed value "obsv" is >= now then 945 // we should return "obsv". If the CAS failed and now > obsv > prv then 946 // some other thread raced this thread and installed a new value, in which case 947 // we could either (a) retry the entire operation, (b) retry trying to install now 948 // or (c) just return obsv. We use (c). No loop is required although in some cases 949 // we might discard a higher "now" value in deference to a slightly lower but freshly 950 // installed obsv value. That's entirely benign -- it admits no new orderings compared 951 // to (a) or (b) -- and greatly reduces coherence traffic. 952 // We might also condition (c) on the magnitude of the delta between obsv and now. 953 // Avoiding excessive CAS operations to hot RW locations is critical. 954 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 955 return (prev == obsv) ? now : obsv; 956 } 957 958 #else // __APPLE__ 959 960 jlong os::javaTimeNanos() { 961 if (os::supports_monotonic_clock()) { 962 struct timespec tp; 963 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 964 assert(status == 0, "gettime error"); 965 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 966 return result; 967 } else { 968 timeval time; 969 int status = gettimeofday(&time, NULL); 970 assert(status != -1, "bsd error"); 971 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 972 return 1000 * usecs; 973 } 974 } 975 976 #endif // __APPLE__ 977 978 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 979 if (os::supports_monotonic_clock()) { 980 info_ptr->max_value = ALL_64_BITS; 981 982 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 983 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 984 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 985 } else { 986 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 987 info_ptr->max_value = ALL_64_BITS; 988 989 // gettimeofday is a real time clock so it skips 990 info_ptr->may_skip_backward = true; 991 info_ptr->may_skip_forward = true; 992 } 993 994 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 995 } 996 997 // Return the real, user, and system times in seconds from an 998 // arbitrary fixed point in the past. 999 bool os::getTimesSecs(double* process_real_time, 1000 double* process_user_time, 1001 double* process_system_time) { 1002 struct tms ticks; 1003 clock_t real_ticks = times(&ticks); 1004 1005 if (real_ticks == (clock_t) (-1)) { 1006 return false; 1007 } else { 1008 double ticks_per_second = (double) clock_tics_per_sec; 1009 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1010 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1011 *process_real_time = ((double) real_ticks) / ticks_per_second; 1012 1013 return true; 1014 } 1015 } 1016 1017 1018 char * os::local_time_string(char *buf, size_t buflen) { 1019 struct tm t; 1020 time_t long_time; 1021 time(&long_time); 1022 localtime_r(&long_time, &t); 1023 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1024 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1025 t.tm_hour, t.tm_min, t.tm_sec); 1026 return buf; 1027 } 1028 1029 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1030 return localtime_r(clock, res); 1031 } 1032 1033 //////////////////////////////////////////////////////////////////////////////// 1034 // runtime exit support 1035 1036 // Note: os::shutdown() might be called very early during initialization, or 1037 // called from signal handler. Before adding something to os::shutdown(), make 1038 // sure it is async-safe and can handle partially initialized VM. 1039 void os::shutdown() { 1040 1041 // allow PerfMemory to attempt cleanup of any persistent resources 1042 perfMemory_exit(); 1043 1044 // needs to remove object in file system 1045 AttachListener::abort(); 1046 1047 // flush buffered output, finish log files 1048 ostream_abort(); 1049 1050 // Check for abort hook 1051 abort_hook_t abort_hook = Arguments::abort_hook(); 1052 if (abort_hook != NULL) { 1053 abort_hook(); 1054 } 1055 1056 } 1057 1058 // Note: os::abort() might be called very early during initialization, or 1059 // called from signal handler. Before adding something to os::abort(), make 1060 // sure it is async-safe and can handle partially initialized VM. 1061 void os::abort(bool dump_core, void* siginfo, const void* context) { 1062 os::shutdown(); 1063 if (dump_core) { 1064 #ifndef PRODUCT 1065 fdStream out(defaultStream::output_fd()); 1066 out.print_raw("Current thread is "); 1067 char buf[16]; 1068 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1069 out.print_raw_cr(buf); 1070 out.print_raw_cr("Dumping core ..."); 1071 #endif 1072 ::abort(); // dump core 1073 } 1074 1075 ::exit(1); 1076 } 1077 1078 // Die immediately, no exit hook, no abort hook, no cleanup. 1079 void os::die() { 1080 // _exit() on BsdThreads only kills current thread 1081 ::abort(); 1082 } 1083 1084 // Information of current thread in variety of formats 1085 pid_t os::Bsd::gettid() { 1086 int retval = -1; 1087 1088 #ifdef __APPLE__ //XNU kernel 1089 // despite the fact mach port is actually not a thread id use it 1090 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1091 retval = ::pthread_mach_thread_np(::pthread_self()); 1092 guarantee(retval != 0, "just checking"); 1093 return retval; 1094 1095 #else 1096 #ifdef __FreeBSD__ 1097 retval = syscall(SYS_thr_self); 1098 #else 1099 #ifdef __OpenBSD__ 1100 retval = syscall(SYS_getthrid); 1101 #else 1102 #ifdef __NetBSD__ 1103 retval = (pid_t) syscall(SYS__lwp_self); 1104 #endif 1105 #endif 1106 #endif 1107 #endif 1108 1109 if (retval == -1) { 1110 return getpid(); 1111 } 1112 } 1113 1114 intx os::current_thread_id() { 1115 #ifdef __APPLE__ 1116 return (intx)::pthread_mach_thread_np(::pthread_self()); 1117 #else 1118 return (intx)::pthread_self(); 1119 #endif 1120 } 1121 1122 int os::current_process_id() { 1123 1124 // Under the old bsd thread library, bsd gives each thread 1125 // its own process id. Because of this each thread will return 1126 // a different pid if this method were to return the result 1127 // of getpid(2). Bsd provides no api that returns the pid 1128 // of the launcher thread for the vm. This implementation 1129 // returns a unique pid, the pid of the launcher thread 1130 // that starts the vm 'process'. 1131 1132 // Under the NPTL, getpid() returns the same pid as the 1133 // launcher thread rather than a unique pid per thread. 1134 // Use gettid() if you want the old pre NPTL behaviour. 1135 1136 // if you are looking for the result of a call to getpid() that 1137 // returns a unique pid for the calling thread, then look at the 1138 // OSThread::thread_id() method in osThread_bsd.hpp file 1139 1140 return (int)(_initial_pid ? _initial_pid : getpid()); 1141 } 1142 1143 // DLL functions 1144 1145 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1146 1147 // This must be hard coded because it's the system's temporary 1148 // directory not the java application's temp directory, ala java.io.tmpdir. 1149 #ifdef __APPLE__ 1150 // macosx has a secure per-user temporary directory 1151 char temp_path_storage[PATH_MAX]; 1152 const char* os::get_temp_directory() { 1153 static char *temp_path = NULL; 1154 if (temp_path == NULL) { 1155 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1156 if (pathSize == 0 || pathSize > PATH_MAX) { 1157 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1158 } 1159 temp_path = temp_path_storage; 1160 } 1161 return temp_path; 1162 } 1163 #else // __APPLE__ 1164 const char* os::get_temp_directory() { return "/tmp"; } 1165 #endif // __APPLE__ 1166 1167 // check if addr is inside libjvm.so 1168 bool os::address_is_in_vm(address addr) { 1169 static address libjvm_base_addr; 1170 Dl_info dlinfo; 1171 1172 if (libjvm_base_addr == NULL) { 1173 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1174 libjvm_base_addr = (address)dlinfo.dli_fbase; 1175 } 1176 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1177 } 1178 1179 if (dladdr((void *)addr, &dlinfo) != 0) { 1180 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1181 } 1182 1183 return false; 1184 } 1185 1186 1187 #define MACH_MAXSYMLEN 256 1188 1189 bool os::dll_address_to_function_name(address addr, char *buf, 1190 int buflen, int *offset, 1191 bool demangle) { 1192 // buf is not optional, but offset is optional 1193 assert(buf != NULL, "sanity check"); 1194 1195 Dl_info dlinfo; 1196 char localbuf[MACH_MAXSYMLEN]; 1197 1198 if (dladdr((void*)addr, &dlinfo) != 0) { 1199 // see if we have a matching symbol 1200 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1201 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1202 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1203 } 1204 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1205 return true; 1206 } 1207 // no matching symbol so try for just file info 1208 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1209 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1210 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1211 return true; 1212 } 1213 } 1214 1215 // Handle non-dynamic manually: 1216 if (dlinfo.dli_fbase != NULL && 1217 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1218 dlinfo.dli_fbase)) { 1219 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1220 jio_snprintf(buf, buflen, "%s", localbuf); 1221 } 1222 return true; 1223 } 1224 } 1225 buf[0] = '\0'; 1226 if (offset != NULL) *offset = -1; 1227 return false; 1228 } 1229 1230 // ported from solaris version 1231 bool os::dll_address_to_library_name(address addr, char* buf, 1232 int buflen, int* offset) { 1233 // buf is not optional, but offset is optional 1234 assert(buf != NULL, "sanity check"); 1235 1236 Dl_info dlinfo; 1237 1238 if (dladdr((void*)addr, &dlinfo) != 0) { 1239 if (dlinfo.dli_fname != NULL) { 1240 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1241 } 1242 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1243 *offset = addr - (address)dlinfo.dli_fbase; 1244 } 1245 return true; 1246 } 1247 1248 buf[0] = '\0'; 1249 if (offset) *offset = -1; 1250 return false; 1251 } 1252 1253 // Loads .dll/.so and 1254 // in case of error it checks if .dll/.so was built for the 1255 // same architecture as Hotspot is running on 1256 1257 #ifdef __APPLE__ 1258 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1259 #ifdef STATIC_BUILD 1260 return os::get_default_process_handle(); 1261 #else 1262 void * result= ::dlopen(filename, RTLD_LAZY); 1263 if (result != NULL) { 1264 // Successful loading 1265 return result; 1266 } 1267 1268 // Read system error message into ebuf 1269 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1270 ebuf[ebuflen-1]='\0'; 1271 1272 return NULL; 1273 #endif // STATIC_BUILD 1274 } 1275 #else 1276 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1277 #ifdef STATIC_BUILD 1278 return os::get_default_process_handle(); 1279 #else 1280 void * result= ::dlopen(filename, RTLD_LAZY); 1281 if (result != NULL) { 1282 // Successful loading 1283 return result; 1284 } 1285 1286 Elf32_Ehdr elf_head; 1287 1288 // Read system error message into ebuf 1289 // It may or may not be overwritten below 1290 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1291 ebuf[ebuflen-1]='\0'; 1292 int diag_msg_max_length=ebuflen-strlen(ebuf); 1293 char* diag_msg_buf=ebuf+strlen(ebuf); 1294 1295 if (diag_msg_max_length==0) { 1296 // No more space in ebuf for additional diagnostics message 1297 return NULL; 1298 } 1299 1300 1301 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1302 1303 if (file_descriptor < 0) { 1304 // Can't open library, report dlerror() message 1305 return NULL; 1306 } 1307 1308 bool failed_to_read_elf_head= 1309 (sizeof(elf_head)!= 1310 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1311 1312 ::close(file_descriptor); 1313 if (failed_to_read_elf_head) { 1314 // file i/o error - report dlerror() msg 1315 return NULL; 1316 } 1317 1318 typedef struct { 1319 Elf32_Half code; // Actual value as defined in elf.h 1320 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1321 char elf_class; // 32 or 64 bit 1322 char endianess; // MSB or LSB 1323 char* name; // String representation 1324 } arch_t; 1325 1326 #ifndef EM_486 1327 #define EM_486 6 /* Intel 80486 */ 1328 #endif 1329 1330 #ifndef EM_MIPS_RS3_LE 1331 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1332 #endif 1333 1334 #ifndef EM_PPC64 1335 #define EM_PPC64 21 /* PowerPC64 */ 1336 #endif 1337 1338 #ifndef EM_S390 1339 #define EM_S390 22 /* IBM System/390 */ 1340 #endif 1341 1342 #ifndef EM_IA_64 1343 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1344 #endif 1345 1346 #ifndef EM_X86_64 1347 #define EM_X86_64 62 /* AMD x86-64 */ 1348 #endif 1349 1350 static const arch_t arch_array[]={ 1351 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1352 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1353 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1354 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1355 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1356 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1357 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1358 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1359 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1360 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1361 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1362 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1363 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1364 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1365 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1366 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1367 }; 1368 1369 #if (defined IA32) 1370 static Elf32_Half running_arch_code=EM_386; 1371 #elif (defined AMD64) 1372 static Elf32_Half running_arch_code=EM_X86_64; 1373 #elif (defined IA64) 1374 static Elf32_Half running_arch_code=EM_IA_64; 1375 #elif (defined __sparc) && (defined _LP64) 1376 static Elf32_Half running_arch_code=EM_SPARCV9; 1377 #elif (defined __sparc) && (!defined _LP64) 1378 static Elf32_Half running_arch_code=EM_SPARC; 1379 #elif (defined __powerpc64__) 1380 static Elf32_Half running_arch_code=EM_PPC64; 1381 #elif (defined __powerpc__) 1382 static Elf32_Half running_arch_code=EM_PPC; 1383 #elif (defined ARM) 1384 static Elf32_Half running_arch_code=EM_ARM; 1385 #elif (defined S390) 1386 static Elf32_Half running_arch_code=EM_S390; 1387 #elif (defined ALPHA) 1388 static Elf32_Half running_arch_code=EM_ALPHA; 1389 #elif (defined MIPSEL) 1390 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1391 #elif (defined PARISC) 1392 static Elf32_Half running_arch_code=EM_PARISC; 1393 #elif (defined MIPS) 1394 static Elf32_Half running_arch_code=EM_MIPS; 1395 #elif (defined M68K) 1396 static Elf32_Half running_arch_code=EM_68K; 1397 #else 1398 #error Method os::dll_load requires that one of following is defined:\ 1399 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1400 #endif 1401 1402 // Identify compatability class for VM's architecture and library's architecture 1403 // Obtain string descriptions for architectures 1404 1405 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1406 int running_arch_index=-1; 1407 1408 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1409 if (running_arch_code == arch_array[i].code) { 1410 running_arch_index = i; 1411 } 1412 if (lib_arch.code == arch_array[i].code) { 1413 lib_arch.compat_class = arch_array[i].compat_class; 1414 lib_arch.name = arch_array[i].name; 1415 } 1416 } 1417 1418 assert(running_arch_index != -1, 1419 "Didn't find running architecture code (running_arch_code) in arch_array"); 1420 if (running_arch_index == -1) { 1421 // Even though running architecture detection failed 1422 // we may still continue with reporting dlerror() message 1423 return NULL; 1424 } 1425 1426 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1427 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1428 return NULL; 1429 } 1430 1431 #ifndef S390 1432 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1433 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1434 return NULL; 1435 } 1436 #endif // !S390 1437 1438 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1439 if (lib_arch.name!=NULL) { 1440 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1441 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1442 lib_arch.name, arch_array[running_arch_index].name); 1443 } else { 1444 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1445 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1446 lib_arch.code, 1447 arch_array[running_arch_index].name); 1448 } 1449 } 1450 1451 return NULL; 1452 #endif // STATIC_BUILD 1453 } 1454 #endif // !__APPLE__ 1455 1456 void* os::get_default_process_handle() { 1457 #ifdef __APPLE__ 1458 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1459 // to avoid finding unexpected symbols on second (or later) 1460 // loads of a library. 1461 return (void*)::dlopen(NULL, RTLD_FIRST); 1462 #else 1463 return (void*)::dlopen(NULL, RTLD_LAZY); 1464 #endif 1465 } 1466 1467 // XXX: Do we need a lock around this as per Linux? 1468 void* os::dll_lookup(void* handle, const char* name) { 1469 return dlsym(handle, name); 1470 } 1471 1472 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1473 outputStream * out = (outputStream *) param; 1474 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name); 1475 return 0; 1476 } 1477 1478 void os::print_dll_info(outputStream *st) { 1479 st->print_cr("Dynamic libraries:"); 1480 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1481 st->print_cr("Error: Cannot print dynamic libraries."); 1482 } 1483 } 1484 1485 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1486 #ifdef RTLD_DI_LINKMAP 1487 Dl_info dli; 1488 void *handle; 1489 Link_map *map; 1490 Link_map *p; 1491 1492 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1493 dli.dli_fname == NULL) { 1494 return 1; 1495 } 1496 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1497 if (handle == NULL) { 1498 return 1; 1499 } 1500 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1501 if (map == NULL) { 1502 dlclose(handle); 1503 return 1; 1504 } 1505 1506 while (map->l_prev != NULL) 1507 map = map->l_prev; 1508 1509 while (map != NULL) { 1510 // Value for top_address is returned as 0 since we don't have any information about module size 1511 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1512 dlclose(handle); 1513 return 1; 1514 } 1515 map = map->l_next; 1516 } 1517 1518 dlclose(handle); 1519 #elif defined(__APPLE__) 1520 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1521 // Value for top_address is returned as 0 since we don't have any information about module size 1522 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1523 return 1; 1524 } 1525 } 1526 return 0; 1527 #else 1528 return 1; 1529 #endif 1530 } 1531 1532 void os::get_summary_os_info(char* buf, size_t buflen) { 1533 // These buffers are small because we want this to be brief 1534 // and not use a lot of stack while generating the hs_err file. 1535 char os[100]; 1536 size_t size = sizeof(os); 1537 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1538 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1539 #ifdef __APPLE__ 1540 strncpy(os, "Darwin", sizeof(os)); 1541 #elif __OpenBSD__ 1542 strncpy(os, "OpenBSD", sizeof(os)); 1543 #else 1544 strncpy(os, "BSD", sizeof(os)); 1545 #endif 1546 } 1547 1548 char release[100]; 1549 size = sizeof(release); 1550 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1551 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1552 // if error, leave blank 1553 strncpy(release, "", sizeof(release)); 1554 } 1555 snprintf(buf, buflen, "%s %s", os, release); 1556 } 1557 1558 void os::print_os_info_brief(outputStream* st) { 1559 os::Posix::print_uname_info(st); 1560 } 1561 1562 void os::print_os_info(outputStream* st) { 1563 st->print("OS:"); 1564 1565 os::Posix::print_uname_info(st); 1566 1567 os::Posix::print_rlimit_info(st); 1568 1569 os::Posix::print_load_average(st); 1570 } 1571 1572 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1573 // Nothing to do for now. 1574 } 1575 1576 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1577 unsigned int mhz; 1578 size_t size = sizeof(mhz); 1579 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1580 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1581 mhz = 1; // looks like an error but can be divided by 1582 } else { 1583 mhz /= 1000000; // reported in millions 1584 } 1585 1586 char model[100]; 1587 size = sizeof(model); 1588 int mib_model[] = { CTL_HW, HW_MODEL }; 1589 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1590 strncpy(model, cpu_arch, sizeof(model)); 1591 } 1592 1593 char machine[100]; 1594 size = sizeof(machine); 1595 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1596 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1597 strncpy(machine, "", sizeof(machine)); 1598 } 1599 1600 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1601 } 1602 1603 void os::print_memory_info(outputStream* st) { 1604 1605 st->print("Memory:"); 1606 st->print(" %dk page", os::vm_page_size()>>10); 1607 1608 st->print(", physical " UINT64_FORMAT "k", 1609 os::physical_memory() >> 10); 1610 st->print("(" UINT64_FORMAT "k free)", 1611 os::available_memory() >> 10); 1612 st->cr(); 1613 } 1614 1615 static void print_signal_handler(outputStream* st, int sig, 1616 char* buf, size_t buflen); 1617 1618 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1619 st->print_cr("Signal Handlers:"); 1620 print_signal_handler(st, SIGSEGV, buf, buflen); 1621 print_signal_handler(st, SIGBUS , buf, buflen); 1622 print_signal_handler(st, SIGFPE , buf, buflen); 1623 print_signal_handler(st, SIGPIPE, buf, buflen); 1624 print_signal_handler(st, SIGXFSZ, buf, buflen); 1625 print_signal_handler(st, SIGILL , buf, buflen); 1626 print_signal_handler(st, SR_signum, buf, buflen); 1627 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1628 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1629 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1630 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1631 } 1632 1633 static char saved_jvm_path[MAXPATHLEN] = {0}; 1634 1635 // Find the full path to the current module, libjvm 1636 void os::jvm_path(char *buf, jint buflen) { 1637 // Error checking. 1638 if (buflen < MAXPATHLEN) { 1639 assert(false, "must use a large-enough buffer"); 1640 buf[0] = '\0'; 1641 return; 1642 } 1643 // Lazy resolve the path to current module. 1644 if (saved_jvm_path[0] != 0) { 1645 strcpy(buf, saved_jvm_path); 1646 return; 1647 } 1648 1649 char dli_fname[MAXPATHLEN]; 1650 bool ret = dll_address_to_library_name( 1651 CAST_FROM_FN_PTR(address, os::jvm_path), 1652 dli_fname, sizeof(dli_fname), NULL); 1653 assert(ret, "cannot locate libjvm"); 1654 char *rp = NULL; 1655 if (ret && dli_fname[0] != '\0') { 1656 rp = os::Posix::realpath(dli_fname, buf, buflen); 1657 } 1658 if (rp == NULL) { 1659 return; 1660 } 1661 1662 if (Arguments::sun_java_launcher_is_altjvm()) { 1663 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1664 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1665 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1666 // appears at the right place in the string, then assume we are 1667 // installed in a JDK and we're done. Otherwise, check for a 1668 // JAVA_HOME environment variable and construct a path to the JVM 1669 // being overridden. 1670 1671 const char *p = buf + strlen(buf) - 1; 1672 for (int count = 0; p > buf && count < 5; ++count) { 1673 for (--p; p > buf && *p != '/'; --p) 1674 /* empty */ ; 1675 } 1676 1677 if (strncmp(p, "/jre/lib/", 9) != 0) { 1678 // Look for JAVA_HOME in the environment. 1679 char* java_home_var = ::getenv("JAVA_HOME"); 1680 if (java_home_var != NULL && java_home_var[0] != 0) { 1681 char* jrelib_p; 1682 int len; 1683 1684 // Check the current module name "libjvm" 1685 p = strrchr(buf, '/'); 1686 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1687 1688 rp = os::Posix::realpath(java_home_var, buf, buflen); 1689 if (rp == NULL) { 1690 return; 1691 } 1692 1693 // determine if this is a legacy image or modules image 1694 // modules image doesn't have "jre" subdirectory 1695 len = strlen(buf); 1696 assert(len < buflen, "Ran out of buffer space"); 1697 jrelib_p = buf + len; 1698 1699 // Add the appropriate library subdir 1700 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1701 if (0 != access(buf, F_OK)) { 1702 snprintf(jrelib_p, buflen-len, "/lib"); 1703 } 1704 1705 // Add the appropriate client or server subdir 1706 len = strlen(buf); 1707 jrelib_p = buf + len; 1708 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1709 if (0 != access(buf, F_OK)) { 1710 snprintf(jrelib_p, buflen-len, "%s", ""); 1711 } 1712 1713 // If the path exists within JAVA_HOME, add the JVM library name 1714 // to complete the path to JVM being overridden. Otherwise fallback 1715 // to the path to the current library. 1716 if (0 == access(buf, F_OK)) { 1717 // Use current module name "libjvm" 1718 len = strlen(buf); 1719 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1720 } else { 1721 // Fall back to path of current library 1722 rp = os::Posix::realpath(dli_fname, buf, buflen); 1723 if (rp == NULL) { 1724 return; 1725 } 1726 } 1727 } 1728 } 1729 } 1730 1731 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1732 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1733 } 1734 1735 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1736 // no prefix required, not even "_" 1737 } 1738 1739 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1740 // no suffix required 1741 } 1742 1743 //////////////////////////////////////////////////////////////////////////////// 1744 // sun.misc.Signal support 1745 1746 static volatile jint sigint_count = 0; 1747 1748 static void UserHandler(int sig, void *siginfo, void *context) { 1749 // 4511530 - sem_post is serialized and handled by the manager thread. When 1750 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1751 // don't want to flood the manager thread with sem_post requests. 1752 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1753 return; 1754 } 1755 1756 // Ctrl-C is pressed during error reporting, likely because the error 1757 // handler fails to abort. Let VM die immediately. 1758 if (sig == SIGINT && VMError::is_error_reported()) { 1759 os::die(); 1760 } 1761 1762 os::signal_notify(sig); 1763 } 1764 1765 void* os::user_handler() { 1766 return CAST_FROM_FN_PTR(void*, UserHandler); 1767 } 1768 1769 extern "C" { 1770 typedef void (*sa_handler_t)(int); 1771 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1772 } 1773 1774 void* os::signal(int signal_number, void* handler) { 1775 struct sigaction sigAct, oldSigAct; 1776 1777 sigfillset(&(sigAct.sa_mask)); 1778 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1779 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1780 1781 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1782 // -1 means registration failed 1783 return (void *)-1; 1784 } 1785 1786 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1787 } 1788 1789 void os::signal_raise(int signal_number) { 1790 ::raise(signal_number); 1791 } 1792 1793 // The following code is moved from os.cpp for making this 1794 // code platform specific, which it is by its very nature. 1795 1796 // Will be modified when max signal is changed to be dynamic 1797 int os::sigexitnum_pd() { 1798 return NSIG; 1799 } 1800 1801 // a counter for each possible signal value 1802 static volatile jint pending_signals[NSIG+1] = { 0 }; 1803 static Semaphore* sig_sem = NULL; 1804 1805 static void jdk_misc_signal_init() { 1806 // Initialize signal structures 1807 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1808 1809 // Initialize signal semaphore 1810 sig_sem = new Semaphore(); 1811 } 1812 1813 void os::signal_notify(int sig) { 1814 if (sig_sem != NULL) { 1815 Atomic::inc(&pending_signals[sig]); 1816 sig_sem->signal(); 1817 } else { 1818 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 1819 // initialization isn't called. 1820 assert(ReduceSignalUsage, "signal semaphore should be created"); 1821 } 1822 } 1823 1824 static int check_pending_signals() { 1825 Atomic::store(0, &sigint_count); 1826 for (;;) { 1827 for (int i = 0; i < NSIG + 1; i++) { 1828 jint n = pending_signals[i]; 1829 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1830 return i; 1831 } 1832 } 1833 JavaThread *thread = JavaThread::current(); 1834 ThreadBlockInVM tbivm(thread); 1835 1836 bool threadIsSuspended; 1837 do { 1838 thread->set_suspend_equivalent(); 1839 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1840 sig_sem->wait(); 1841 1842 // were we externally suspended while we were waiting? 1843 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1844 if (threadIsSuspended) { 1845 // The semaphore has been incremented, but while we were waiting 1846 // another thread suspended us. We don't want to continue running 1847 // while suspended because that would surprise the thread that 1848 // suspended us. 1849 sig_sem->signal(); 1850 1851 thread->java_suspend_self(); 1852 } 1853 } while (threadIsSuspended); 1854 } 1855 } 1856 1857 int os::signal_wait() { 1858 return check_pending_signals(); 1859 } 1860 1861 //////////////////////////////////////////////////////////////////////////////// 1862 // Virtual Memory 1863 1864 int os::vm_page_size() { 1865 // Seems redundant as all get out 1866 assert(os::Bsd::page_size() != -1, "must call os::init"); 1867 return os::Bsd::page_size(); 1868 } 1869 1870 // Solaris allocates memory by pages. 1871 int os::vm_allocation_granularity() { 1872 assert(os::Bsd::page_size() != -1, "must call os::init"); 1873 return os::Bsd::page_size(); 1874 } 1875 1876 // Rationale behind this function: 1877 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1878 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1879 // samples for JITted code. Here we create private executable mapping over the code cache 1880 // and then we can use standard (well, almost, as mapping can change) way to provide 1881 // info for the reporting script by storing timestamp and location of symbol 1882 void bsd_wrap_code(char* base, size_t size) { 1883 static volatile jint cnt = 0; 1884 1885 if (!UseOprofile) { 1886 return; 1887 } 1888 1889 char buf[PATH_MAX + 1]; 1890 int num = Atomic::add(1, &cnt); 1891 1892 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1893 os::get_temp_directory(), os::current_process_id(), num); 1894 unlink(buf); 1895 1896 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1897 1898 if (fd != -1) { 1899 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1900 if (rv != (off_t)-1) { 1901 if (::write(fd, "", 1) == 1) { 1902 mmap(base, size, 1903 PROT_READ|PROT_WRITE|PROT_EXEC, 1904 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1905 } 1906 } 1907 ::close(fd); 1908 unlink(buf); 1909 } 1910 } 1911 1912 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 1913 int err) { 1914 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT 1915 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec, 1916 os::errno_name(err), err); 1917 } 1918 1919 // NOTE: Bsd kernel does not really reserve the pages for us. 1920 // All it does is to check if there are enough free pages 1921 // left at the time of mmap(). This could be a potential 1922 // problem. 1923 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1924 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 1925 #ifdef __OpenBSD__ 1926 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 1927 if (::mprotect(addr, size, prot) == 0) { 1928 return true; 1929 } 1930 #else 1931 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 1932 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 1933 if (res != (uintptr_t) MAP_FAILED) { 1934 return true; 1935 } 1936 #endif 1937 1938 // Warn about any commit errors we see in non-product builds just 1939 // in case mmap() doesn't work as described on the man page. 1940 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 1941 1942 return false; 1943 } 1944 1945 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 1946 bool exec) { 1947 // alignment_hint is ignored on this OS 1948 return pd_commit_memory(addr, size, exec); 1949 } 1950 1951 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 1952 const char* mesg) { 1953 assert(mesg != NULL, "mesg must be specified"); 1954 if (!pd_commit_memory(addr, size, exec)) { 1955 // add extra info in product mode for vm_exit_out_of_memory(): 1956 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 1957 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 1958 } 1959 } 1960 1961 void os::pd_commit_memory_or_exit(char* addr, size_t size, 1962 size_t alignment_hint, bool exec, 1963 const char* mesg) { 1964 // alignment_hint is ignored on this OS 1965 pd_commit_memory_or_exit(addr, size, exec, mesg); 1966 } 1967 1968 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1969 } 1970 1971 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 1972 ::madvise(addr, bytes, MADV_DONTNEED); 1973 } 1974 1975 void os::numa_make_global(char *addr, size_t bytes) { 1976 } 1977 1978 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 1979 } 1980 1981 bool os::numa_topology_changed() { return false; } 1982 1983 size_t os::numa_get_groups_num() { 1984 return 1; 1985 } 1986 1987 int os::numa_get_group_id() { 1988 return 0; 1989 } 1990 1991 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 1992 if (size > 0) { 1993 ids[0] = 0; 1994 return 1; 1995 } 1996 return 0; 1997 } 1998 1999 bool os::get_page_info(char *start, page_info* info) { 2000 return false; 2001 } 2002 2003 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2004 return end; 2005 } 2006 2007 2008 bool os::pd_uncommit_memory(char* addr, size_t size) { 2009 #ifdef __OpenBSD__ 2010 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2011 return ::mprotect(addr, size, PROT_NONE) == 0; 2012 #else 2013 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2014 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2015 return res != (uintptr_t) MAP_FAILED; 2016 #endif 2017 } 2018 2019 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2020 return os::commit_memory(addr, size, !ExecMem); 2021 } 2022 2023 // If this is a growable mapping, remove the guard pages entirely by 2024 // munmap()ping them. If not, just call uncommit_memory(). 2025 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2026 return os::uncommit_memory(addr, size); 2027 } 2028 2029 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2030 // at 'requested_addr'. If there are existing memory mappings at the same 2031 // location, however, they will be overwritten. If 'fixed' is false, 2032 // 'requested_addr' is only treated as a hint, the return value may or 2033 // may not start from the requested address. Unlike Bsd mmap(), this 2034 // function returns NULL to indicate failure. 2035 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2036 char * addr; 2037 int flags; 2038 2039 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2040 if (fixed) { 2041 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2042 flags |= MAP_FIXED; 2043 } 2044 2045 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2046 // touch an uncommitted page. Otherwise, the read/write might 2047 // succeed if we have enough swap space to back the physical page. 2048 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2049 flags, -1, 0); 2050 2051 return addr == MAP_FAILED ? NULL : addr; 2052 } 2053 2054 static int anon_munmap(char * addr, size_t size) { 2055 return ::munmap(addr, size) == 0; 2056 } 2057 2058 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2059 size_t alignment_hint) { 2060 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2061 } 2062 2063 bool os::pd_release_memory(char* addr, size_t size) { 2064 return anon_munmap(addr, size); 2065 } 2066 2067 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2068 // Bsd wants the mprotect address argument to be page aligned. 2069 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size()); 2070 2071 // According to SUSv3, mprotect() should only be used with mappings 2072 // established by mmap(), and mmap() always maps whole pages. Unaligned 2073 // 'addr' likely indicates problem in the VM (e.g. trying to change 2074 // protection of malloc'ed or statically allocated memory). Check the 2075 // caller if you hit this assert. 2076 assert(addr == bottom, "sanity check"); 2077 2078 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2079 return ::mprotect(bottom, size, prot) == 0; 2080 } 2081 2082 // Set protections specified 2083 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2084 bool is_committed) { 2085 unsigned int p = 0; 2086 switch (prot) { 2087 case MEM_PROT_NONE: p = PROT_NONE; break; 2088 case MEM_PROT_READ: p = PROT_READ; break; 2089 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2090 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2091 default: 2092 ShouldNotReachHere(); 2093 } 2094 // is_committed is unused. 2095 return bsd_mprotect(addr, bytes, p); 2096 } 2097 2098 bool os::guard_memory(char* addr, size_t size) { 2099 return bsd_mprotect(addr, size, PROT_NONE); 2100 } 2101 2102 bool os::unguard_memory(char* addr, size_t size) { 2103 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2104 } 2105 2106 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2107 return false; 2108 } 2109 2110 // Large page support 2111 2112 static size_t _large_page_size = 0; 2113 2114 void os::large_page_init() { 2115 } 2116 2117 2118 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2119 fatal("This code is not used or maintained."); 2120 2121 // "exec" is passed in but not used. Creating the shared image for 2122 // the code cache doesn't have an SHM_X executable permission to check. 2123 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2124 2125 key_t key = IPC_PRIVATE; 2126 char *addr; 2127 2128 bool warn_on_failure = UseLargePages && 2129 (!FLAG_IS_DEFAULT(UseLargePages) || 2130 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2131 2132 // Create a large shared memory region to attach to based on size. 2133 // Currently, size is the total size of the heap 2134 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2135 if (shmid == -1) { 2136 // Possible reasons for shmget failure: 2137 // 1. shmmax is too small for Java heap. 2138 // > check shmmax value: cat /proc/sys/kernel/shmmax 2139 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2140 // 2. not enough large page memory. 2141 // > check available large pages: cat /proc/meminfo 2142 // > increase amount of large pages: 2143 // echo new_value > /proc/sys/vm/nr_hugepages 2144 // Note 1: different Bsd may use different name for this property, 2145 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2146 // Note 2: it's possible there's enough physical memory available but 2147 // they are so fragmented after a long run that they can't 2148 // coalesce into large pages. Try to reserve large pages when 2149 // the system is still "fresh". 2150 if (warn_on_failure) { 2151 warning("Failed to reserve shared memory (errno = %d).", errno); 2152 } 2153 return NULL; 2154 } 2155 2156 // attach to the region 2157 addr = (char*)shmat(shmid, req_addr, 0); 2158 int err = errno; 2159 2160 // Remove shmid. If shmat() is successful, the actual shared memory segment 2161 // will be deleted when it's detached by shmdt() or when the process 2162 // terminates. If shmat() is not successful this will remove the shared 2163 // segment immediately. 2164 shmctl(shmid, IPC_RMID, NULL); 2165 2166 if ((intptr_t)addr == -1) { 2167 if (warn_on_failure) { 2168 warning("Failed to attach shared memory (errno = %d).", err); 2169 } 2170 return NULL; 2171 } 2172 2173 // The memory is committed 2174 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2175 2176 return addr; 2177 } 2178 2179 bool os::release_memory_special(char* base, size_t bytes) { 2180 if (MemTracker::tracking_level() > NMT_minimal) { 2181 Tracker tkr(Tracker::release); 2182 // detaching the SHM segment will also delete it, see reserve_memory_special() 2183 int rslt = shmdt(base); 2184 if (rslt == 0) { 2185 tkr.record((address)base, bytes); 2186 return true; 2187 } else { 2188 return false; 2189 } 2190 } else { 2191 return shmdt(base) == 0; 2192 } 2193 } 2194 2195 size_t os::large_page_size() { 2196 return _large_page_size; 2197 } 2198 2199 // HugeTLBFS allows application to commit large page memory on demand; 2200 // with SysV SHM the entire memory region must be allocated as shared 2201 // memory. 2202 bool os::can_commit_large_page_memory() { 2203 return UseHugeTLBFS; 2204 } 2205 2206 bool os::can_execute_large_page_memory() { 2207 return UseHugeTLBFS; 2208 } 2209 2210 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2211 assert(file_desc >= 0, "file_desc is not valid"); 2212 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2213 if (result != NULL) { 2214 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2215 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2216 } 2217 } 2218 return result; 2219 } 2220 2221 // Reserve memory at an arbitrary address, only if that area is 2222 // available (and not reserved for something else). 2223 2224 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2225 const int max_tries = 10; 2226 char* base[max_tries]; 2227 size_t size[max_tries]; 2228 const size_t gap = 0x000000; 2229 2230 // Assert only that the size is a multiple of the page size, since 2231 // that's all that mmap requires, and since that's all we really know 2232 // about at this low abstraction level. If we need higher alignment, 2233 // we can either pass an alignment to this method or verify alignment 2234 // in one of the methods further up the call chain. See bug 5044738. 2235 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2236 2237 // Repeatedly allocate blocks until the block is allocated at the 2238 // right spot. 2239 2240 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2241 // if kernel honors the hint then we can return immediately. 2242 char * addr = anon_mmap(requested_addr, bytes, false); 2243 if (addr == requested_addr) { 2244 return requested_addr; 2245 } 2246 2247 if (addr != NULL) { 2248 // mmap() is successful but it fails to reserve at the requested address 2249 anon_munmap(addr, bytes); 2250 } 2251 2252 int i; 2253 for (i = 0; i < max_tries; ++i) { 2254 base[i] = reserve_memory(bytes); 2255 2256 if (base[i] != NULL) { 2257 // Is this the block we wanted? 2258 if (base[i] == requested_addr) { 2259 size[i] = bytes; 2260 break; 2261 } 2262 2263 // Does this overlap the block we wanted? Give back the overlapped 2264 // parts and try again. 2265 2266 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2267 if (top_overlap >= 0 && top_overlap < bytes) { 2268 unmap_memory(base[i], top_overlap); 2269 base[i] += top_overlap; 2270 size[i] = bytes - top_overlap; 2271 } else { 2272 size_t bottom_overlap = base[i] + bytes - requested_addr; 2273 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2274 unmap_memory(requested_addr, bottom_overlap); 2275 size[i] = bytes - bottom_overlap; 2276 } else { 2277 size[i] = bytes; 2278 } 2279 } 2280 } 2281 } 2282 2283 // Give back the unused reserved pieces. 2284 2285 for (int j = 0; j < i; ++j) { 2286 if (base[j] != NULL) { 2287 unmap_memory(base[j], size[j]); 2288 } 2289 } 2290 2291 if (i < max_tries) { 2292 return requested_addr; 2293 } else { 2294 return NULL; 2295 } 2296 } 2297 2298 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2299 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2300 } 2301 2302 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2303 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2304 } 2305 2306 void os::naked_short_sleep(jlong ms) { 2307 struct timespec req; 2308 2309 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2310 req.tv_sec = 0; 2311 if (ms > 0) { 2312 req.tv_nsec = (ms % 1000) * 1000000; 2313 } else { 2314 req.tv_nsec = 1; 2315 } 2316 2317 nanosleep(&req, NULL); 2318 2319 return; 2320 } 2321 2322 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2323 void os::infinite_sleep() { 2324 while (true) { // sleep forever ... 2325 ::sleep(100); // ... 100 seconds at a time 2326 } 2327 } 2328 2329 // Used to convert frequent JVM_Yield() to nops 2330 bool os::dont_yield() { 2331 return DontYieldALot; 2332 } 2333 2334 void os::naked_yield() { 2335 sched_yield(); 2336 } 2337 2338 //////////////////////////////////////////////////////////////////////////////// 2339 // thread priority support 2340 2341 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2342 // only supports dynamic priority, static priority must be zero. For real-time 2343 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2344 // However, for large multi-threaded applications, SCHED_RR is not only slower 2345 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2346 // of 5 runs - Sep 2005). 2347 // 2348 // The following code actually changes the niceness of kernel-thread/LWP. It 2349 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2350 // not the entire user process, and user level threads are 1:1 mapped to kernel 2351 // threads. It has always been the case, but could change in the future. For 2352 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2353 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2354 2355 #if !defined(__APPLE__) 2356 int os::java_to_os_priority[CriticalPriority + 1] = { 2357 19, // 0 Entry should never be used 2358 2359 0, // 1 MinPriority 2360 3, // 2 2361 6, // 3 2362 2363 10, // 4 2364 15, // 5 NormPriority 2365 18, // 6 2366 2367 21, // 7 2368 25, // 8 2369 28, // 9 NearMaxPriority 2370 2371 31, // 10 MaxPriority 2372 2373 31 // 11 CriticalPriority 2374 }; 2375 #else 2376 // Using Mach high-level priority assignments 2377 int os::java_to_os_priority[CriticalPriority + 1] = { 2378 0, // 0 Entry should never be used (MINPRI_USER) 2379 2380 27, // 1 MinPriority 2381 28, // 2 2382 29, // 3 2383 2384 30, // 4 2385 31, // 5 NormPriority (BASEPRI_DEFAULT) 2386 32, // 6 2387 2388 33, // 7 2389 34, // 8 2390 35, // 9 NearMaxPriority 2391 2392 36, // 10 MaxPriority 2393 2394 36 // 11 CriticalPriority 2395 }; 2396 #endif 2397 2398 static int prio_init() { 2399 if (ThreadPriorityPolicy == 1) { 2400 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2401 // if effective uid is not root. Perhaps, a more elegant way of doing 2402 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2403 if (geteuid() != 0) { 2404 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2405 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2406 } 2407 ThreadPriorityPolicy = 0; 2408 } 2409 } 2410 if (UseCriticalJavaThreadPriority) { 2411 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2412 } 2413 return 0; 2414 } 2415 2416 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2417 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2418 2419 #ifdef __OpenBSD__ 2420 // OpenBSD pthread_setprio starves low priority threads 2421 return OS_OK; 2422 #elif defined(__FreeBSD__) 2423 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2424 #elif defined(__APPLE__) || defined(__NetBSD__) 2425 struct sched_param sp; 2426 int policy; 2427 pthread_t self = pthread_self(); 2428 2429 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2430 return OS_ERR; 2431 } 2432 2433 sp.sched_priority = newpri; 2434 if (pthread_setschedparam(self, policy, &sp) != 0) { 2435 return OS_ERR; 2436 } 2437 2438 return OS_OK; 2439 #else 2440 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2441 return (ret == 0) ? OS_OK : OS_ERR; 2442 #endif 2443 } 2444 2445 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2446 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2447 *priority_ptr = java_to_os_priority[NormPriority]; 2448 return OS_OK; 2449 } 2450 2451 errno = 0; 2452 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2453 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2454 #elif defined(__APPLE__) || defined(__NetBSD__) 2455 int policy; 2456 struct sched_param sp; 2457 2458 pthread_getschedparam(pthread_self(), &policy, &sp); 2459 *priority_ptr = sp.sched_priority; 2460 #else 2461 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2462 #endif 2463 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2464 } 2465 2466 // Hint to the underlying OS that a task switch would not be good. 2467 // Void return because it's a hint and can fail. 2468 void os::hint_no_preempt() {} 2469 2470 //////////////////////////////////////////////////////////////////////////////// 2471 // suspend/resume support 2472 2473 // The low-level signal-based suspend/resume support is a remnant from the 2474 // old VM-suspension that used to be for java-suspension, safepoints etc, 2475 // within hotspot. Currently used by JFR's OSThreadSampler 2476 // 2477 // The remaining code is greatly simplified from the more general suspension 2478 // code that used to be used. 2479 // 2480 // The protocol is quite simple: 2481 // - suspend: 2482 // - sends a signal to the target thread 2483 // - polls the suspend state of the osthread using a yield loop 2484 // - target thread signal handler (SR_handler) sets suspend state 2485 // and blocks in sigsuspend until continued 2486 // - resume: 2487 // - sets target osthread state to continue 2488 // - sends signal to end the sigsuspend loop in the SR_handler 2489 // 2490 // Note that the SR_lock plays no role in this suspend/resume protocol, 2491 // but is checked for NULL in SR_handler as a thread termination indicator. 2492 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2493 // 2494 // Note that resume_clear_context() and suspend_save_context() are needed 2495 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2496 // which in part is used by: 2497 // - Forte Analyzer: AsyncGetCallTrace() 2498 // - StackBanging: get_frame_at_stack_banging_point() 2499 2500 static void resume_clear_context(OSThread *osthread) { 2501 osthread->set_ucontext(NULL); 2502 osthread->set_siginfo(NULL); 2503 } 2504 2505 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2506 osthread->set_ucontext(context); 2507 osthread->set_siginfo(siginfo); 2508 } 2509 2510 // Handler function invoked when a thread's execution is suspended or 2511 // resumed. We have to be careful that only async-safe functions are 2512 // called here (Note: most pthread functions are not async safe and 2513 // should be avoided.) 2514 // 2515 // Note: sigwait() is a more natural fit than sigsuspend() from an 2516 // interface point of view, but sigwait() prevents the signal hander 2517 // from being run. libpthread would get very confused by not having 2518 // its signal handlers run and prevents sigwait()'s use with the 2519 // mutex granting granting signal. 2520 // 2521 // Currently only ever called on the VMThread or JavaThread 2522 // 2523 #ifdef __APPLE__ 2524 static OSXSemaphore sr_semaphore; 2525 #else 2526 static PosixSemaphore sr_semaphore; 2527 #endif 2528 2529 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2530 // Save and restore errno to avoid confusing native code with EINTR 2531 // after sigsuspend. 2532 int old_errno = errno; 2533 2534 Thread* thread = Thread::current_or_null_safe(); 2535 assert(thread != NULL, "Missing current thread in SR_handler"); 2536 2537 // On some systems we have seen signal delivery get "stuck" until the signal 2538 // mask is changed as part of thread termination. Check that the current thread 2539 // has not already terminated (via SR_lock()) - else the following assertion 2540 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2541 // destructor has completed. 2542 2543 if (thread->SR_lock() == NULL) { 2544 return; 2545 } 2546 2547 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2548 2549 OSThread* osthread = thread->osthread(); 2550 2551 os::SuspendResume::State current = osthread->sr.state(); 2552 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2553 suspend_save_context(osthread, siginfo, context); 2554 2555 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2556 os::SuspendResume::State state = osthread->sr.suspended(); 2557 if (state == os::SuspendResume::SR_SUSPENDED) { 2558 sigset_t suspend_set; // signals for sigsuspend() 2559 2560 // get current set of blocked signals and unblock resume signal 2561 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2562 sigdelset(&suspend_set, SR_signum); 2563 2564 sr_semaphore.signal(); 2565 // wait here until we are resumed 2566 while (1) { 2567 sigsuspend(&suspend_set); 2568 2569 os::SuspendResume::State result = osthread->sr.running(); 2570 if (result == os::SuspendResume::SR_RUNNING) { 2571 sr_semaphore.signal(); 2572 break; 2573 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2574 ShouldNotReachHere(); 2575 } 2576 } 2577 2578 } else if (state == os::SuspendResume::SR_RUNNING) { 2579 // request was cancelled, continue 2580 } else { 2581 ShouldNotReachHere(); 2582 } 2583 2584 resume_clear_context(osthread); 2585 } else if (current == os::SuspendResume::SR_RUNNING) { 2586 // request was cancelled, continue 2587 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2588 // ignore 2589 } else { 2590 // ignore 2591 } 2592 2593 errno = old_errno; 2594 } 2595 2596 2597 static int SR_initialize() { 2598 struct sigaction act; 2599 char *s; 2600 // Get signal number to use for suspend/resume 2601 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2602 int sig = ::strtol(s, 0, 10); 2603 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2604 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2605 SR_signum = sig; 2606 } else { 2607 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2608 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2609 } 2610 } 2611 2612 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2613 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2614 2615 sigemptyset(&SR_sigset); 2616 sigaddset(&SR_sigset, SR_signum); 2617 2618 // Set up signal handler for suspend/resume 2619 act.sa_flags = SA_RESTART|SA_SIGINFO; 2620 act.sa_handler = (void (*)(int)) SR_handler; 2621 2622 // SR_signum is blocked by default. 2623 // 4528190 - We also need to block pthread restart signal (32 on all 2624 // supported Bsd platforms). Note that BsdThreads need to block 2625 // this signal for all threads to work properly. So we don't have 2626 // to use hard-coded signal number when setting up the mask. 2627 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2628 2629 if (sigaction(SR_signum, &act, 0) == -1) { 2630 return -1; 2631 } 2632 2633 // Save signal flag 2634 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2635 return 0; 2636 } 2637 2638 static int sr_notify(OSThread* osthread) { 2639 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2640 assert_status(status == 0, status, "pthread_kill"); 2641 return status; 2642 } 2643 2644 // "Randomly" selected value for how long we want to spin 2645 // before bailing out on suspending a thread, also how often 2646 // we send a signal to a thread we want to resume 2647 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2648 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2649 2650 // returns true on success and false on error - really an error is fatal 2651 // but this seems the normal response to library errors 2652 static bool do_suspend(OSThread* osthread) { 2653 assert(osthread->sr.is_running(), "thread should be running"); 2654 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2655 2656 // mark as suspended and send signal 2657 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2658 // failed to switch, state wasn't running? 2659 ShouldNotReachHere(); 2660 return false; 2661 } 2662 2663 if (sr_notify(osthread) != 0) { 2664 ShouldNotReachHere(); 2665 } 2666 2667 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2668 while (true) { 2669 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2670 break; 2671 } else { 2672 // timeout 2673 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2674 if (cancelled == os::SuspendResume::SR_RUNNING) { 2675 return false; 2676 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2677 // make sure that we consume the signal on the semaphore as well 2678 sr_semaphore.wait(); 2679 break; 2680 } else { 2681 ShouldNotReachHere(); 2682 return false; 2683 } 2684 } 2685 } 2686 2687 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2688 return true; 2689 } 2690 2691 static void do_resume(OSThread* osthread) { 2692 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2693 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2694 2695 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2696 // failed to switch to WAKEUP_REQUEST 2697 ShouldNotReachHere(); 2698 return; 2699 } 2700 2701 while (true) { 2702 if (sr_notify(osthread) == 0) { 2703 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2704 if (osthread->sr.is_running()) { 2705 return; 2706 } 2707 } 2708 } else { 2709 ShouldNotReachHere(); 2710 } 2711 } 2712 2713 guarantee(osthread->sr.is_running(), "Must be running!"); 2714 } 2715 2716 /////////////////////////////////////////////////////////////////////////////////// 2717 // signal handling (except suspend/resume) 2718 2719 // This routine may be used by user applications as a "hook" to catch signals. 2720 // The user-defined signal handler must pass unrecognized signals to this 2721 // routine, and if it returns true (non-zero), then the signal handler must 2722 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2723 // routine will never retun false (zero), but instead will execute a VM panic 2724 // routine kill the process. 2725 // 2726 // If this routine returns false, it is OK to call it again. This allows 2727 // the user-defined signal handler to perform checks either before or after 2728 // the VM performs its own checks. Naturally, the user code would be making 2729 // a serious error if it tried to handle an exception (such as a null check 2730 // or breakpoint) that the VM was generating for its own correct operation. 2731 // 2732 // This routine may recognize any of the following kinds of signals: 2733 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2734 // It should be consulted by handlers for any of those signals. 2735 // 2736 // The caller of this routine must pass in the three arguments supplied 2737 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2738 // field of the structure passed to sigaction(). This routine assumes that 2739 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2740 // 2741 // Note that the VM will print warnings if it detects conflicting signal 2742 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2743 // 2744 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2745 void* ucontext, 2746 int abort_if_unrecognized); 2747 2748 static void signalHandler(int sig, siginfo_t* info, void* uc) { 2749 assert(info != NULL && uc != NULL, "it must be old kernel"); 2750 int orig_errno = errno; // Preserve errno value over signal handler. 2751 JVM_handle_bsd_signal(sig, info, uc, true); 2752 errno = orig_errno; 2753 } 2754 2755 2756 // This boolean allows users to forward their own non-matching signals 2757 // to JVM_handle_bsd_signal, harmlessly. 2758 bool os::Bsd::signal_handlers_are_installed = false; 2759 2760 // For signal-chaining 2761 struct sigaction sigact[NSIG]; 2762 uint32_t sigs = 0; 2763 #if (32 < NSIG-1) 2764 #error "Not all signals can be encoded in sigs. Adapt its type!" 2765 #endif 2766 bool os::Bsd::libjsig_is_loaded = false; 2767 typedef struct sigaction *(*get_signal_t)(int); 2768 get_signal_t os::Bsd::get_signal_action = NULL; 2769 2770 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2771 struct sigaction *actp = NULL; 2772 2773 if (libjsig_is_loaded) { 2774 // Retrieve the old signal handler from libjsig 2775 actp = (*get_signal_action)(sig); 2776 } 2777 if (actp == NULL) { 2778 // Retrieve the preinstalled signal handler from jvm 2779 actp = get_preinstalled_handler(sig); 2780 } 2781 2782 return actp; 2783 } 2784 2785 static bool call_chained_handler(struct sigaction *actp, int sig, 2786 siginfo_t *siginfo, void *context) { 2787 // Call the old signal handler 2788 if (actp->sa_handler == SIG_DFL) { 2789 // It's more reasonable to let jvm treat it as an unexpected exception 2790 // instead of taking the default action. 2791 return false; 2792 } else if (actp->sa_handler != SIG_IGN) { 2793 if ((actp->sa_flags & SA_NODEFER) == 0) { 2794 // automaticlly block the signal 2795 sigaddset(&(actp->sa_mask), sig); 2796 } 2797 2798 sa_handler_t hand; 2799 sa_sigaction_t sa; 2800 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2801 // retrieve the chained handler 2802 if (siginfo_flag_set) { 2803 sa = actp->sa_sigaction; 2804 } else { 2805 hand = actp->sa_handler; 2806 } 2807 2808 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2809 actp->sa_handler = SIG_DFL; 2810 } 2811 2812 // try to honor the signal mask 2813 sigset_t oset; 2814 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2815 2816 // call into the chained handler 2817 if (siginfo_flag_set) { 2818 (*sa)(sig, siginfo, context); 2819 } else { 2820 (*hand)(sig); 2821 } 2822 2823 // restore the signal mask 2824 pthread_sigmask(SIG_SETMASK, &oset, 0); 2825 } 2826 // Tell jvm's signal handler the signal is taken care of. 2827 return true; 2828 } 2829 2830 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2831 bool chained = false; 2832 // signal-chaining 2833 if (UseSignalChaining) { 2834 struct sigaction *actp = get_chained_signal_action(sig); 2835 if (actp != NULL) { 2836 chained = call_chained_handler(actp, sig, siginfo, context); 2837 } 2838 } 2839 return chained; 2840 } 2841 2842 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2843 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 2844 return &sigact[sig]; 2845 } 2846 return NULL; 2847 } 2848 2849 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2850 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2851 sigact[sig] = oldAct; 2852 sigs |= (uint32_t)1 << (sig-1); 2853 } 2854 2855 // for diagnostic 2856 int sigflags[NSIG]; 2857 2858 int os::Bsd::get_our_sigflags(int sig) { 2859 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2860 return sigflags[sig]; 2861 } 2862 2863 void os::Bsd::set_our_sigflags(int sig, int flags) { 2864 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2865 if (sig > 0 && sig < NSIG) { 2866 sigflags[sig] = flags; 2867 } 2868 } 2869 2870 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 2871 // Check for overwrite. 2872 struct sigaction oldAct; 2873 sigaction(sig, (struct sigaction*)NULL, &oldAct); 2874 2875 void* oldhand = oldAct.sa_sigaction 2876 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2877 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2878 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 2879 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 2880 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 2881 if (AllowUserSignalHandlers || !set_installed) { 2882 // Do not overwrite; user takes responsibility to forward to us. 2883 return; 2884 } else if (UseSignalChaining) { 2885 // save the old handler in jvm 2886 save_preinstalled_handler(sig, oldAct); 2887 // libjsig also interposes the sigaction() call below and saves the 2888 // old sigaction on it own. 2889 } else { 2890 fatal("Encountered unexpected pre-existing sigaction handler " 2891 "%#lx for signal %d.", (long)oldhand, sig); 2892 } 2893 } 2894 2895 struct sigaction sigAct; 2896 sigfillset(&(sigAct.sa_mask)); 2897 sigAct.sa_handler = SIG_DFL; 2898 if (!set_installed) { 2899 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2900 } else { 2901 sigAct.sa_sigaction = signalHandler; 2902 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2903 } 2904 #ifdef __APPLE__ 2905 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 2906 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 2907 // if the signal handler declares it will handle it on alternate stack. 2908 // Notice we only declare we will handle it on alt stack, but we are not 2909 // actually going to use real alt stack - this is just a workaround. 2910 // Please see ux_exception.c, method catch_mach_exception_raise for details 2911 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 2912 if (sig == SIGSEGV) { 2913 sigAct.sa_flags |= SA_ONSTACK; 2914 } 2915 #endif 2916 2917 // Save flags, which are set by ours 2918 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2919 sigflags[sig] = sigAct.sa_flags; 2920 2921 int ret = sigaction(sig, &sigAct, &oldAct); 2922 assert(ret == 0, "check"); 2923 2924 void* oldhand2 = oldAct.sa_sigaction 2925 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2926 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2927 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 2928 } 2929 2930 // install signal handlers for signals that HotSpot needs to 2931 // handle in order to support Java-level exception handling. 2932 2933 void os::Bsd::install_signal_handlers() { 2934 if (!signal_handlers_are_installed) { 2935 signal_handlers_are_installed = true; 2936 2937 // signal-chaining 2938 typedef void (*signal_setting_t)(); 2939 signal_setting_t begin_signal_setting = NULL; 2940 signal_setting_t end_signal_setting = NULL; 2941 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2942 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 2943 if (begin_signal_setting != NULL) { 2944 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2945 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 2946 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 2947 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 2948 libjsig_is_loaded = true; 2949 assert(UseSignalChaining, "should enable signal-chaining"); 2950 } 2951 if (libjsig_is_loaded) { 2952 // Tell libjsig jvm is setting signal handlers 2953 (*begin_signal_setting)(); 2954 } 2955 2956 set_signal_handler(SIGSEGV, true); 2957 set_signal_handler(SIGPIPE, true); 2958 set_signal_handler(SIGBUS, true); 2959 set_signal_handler(SIGILL, true); 2960 set_signal_handler(SIGFPE, true); 2961 set_signal_handler(SIGXFSZ, true); 2962 2963 #if defined(__APPLE__) 2964 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 2965 // signals caught and handled by the JVM. To work around this, we reset the mach task 2966 // signal handler that's placed on our process by CrashReporter. This disables 2967 // CrashReporter-based reporting. 2968 // 2969 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 2970 // on caught fatal signals. 2971 // 2972 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 2973 // handlers. By replacing the existing task exception handler, we disable gdb's mach 2974 // exception handling, while leaving the standard BSD signal handlers functional. 2975 kern_return_t kr; 2976 kr = task_set_exception_ports(mach_task_self(), 2977 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 2978 MACH_PORT_NULL, 2979 EXCEPTION_STATE_IDENTITY, 2980 MACHINE_THREAD_STATE); 2981 2982 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 2983 #endif 2984 2985 if (libjsig_is_loaded) { 2986 // Tell libjsig jvm finishes setting signal handlers 2987 (*end_signal_setting)(); 2988 } 2989 2990 // We don't activate signal checker if libjsig is in place, we trust ourselves 2991 // and if UserSignalHandler is installed all bets are off 2992 if (CheckJNICalls) { 2993 if (libjsig_is_loaded) { 2994 if (PrintJNIResolving) { 2995 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 2996 } 2997 check_signals = false; 2998 } 2999 if (AllowUserSignalHandlers) { 3000 if (PrintJNIResolving) { 3001 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3002 } 3003 check_signals = false; 3004 } 3005 } 3006 } 3007 } 3008 3009 3010 ///// 3011 // glibc on Bsd platform uses non-documented flag 3012 // to indicate, that some special sort of signal 3013 // trampoline is used. 3014 // We will never set this flag, and we should 3015 // ignore this flag in our diagnostic 3016 #ifdef SIGNIFICANT_SIGNAL_MASK 3017 #undef SIGNIFICANT_SIGNAL_MASK 3018 #endif 3019 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3020 3021 static const char* get_signal_handler_name(address handler, 3022 char* buf, int buflen) { 3023 int offset; 3024 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3025 if (found) { 3026 // skip directory names 3027 const char *p1, *p2; 3028 p1 = buf; 3029 size_t len = strlen(os::file_separator()); 3030 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3031 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3032 } else { 3033 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3034 } 3035 return buf; 3036 } 3037 3038 static void print_signal_handler(outputStream* st, int sig, 3039 char* buf, size_t buflen) { 3040 struct sigaction sa; 3041 3042 sigaction(sig, NULL, &sa); 3043 3044 // See comment for SIGNIFICANT_SIGNAL_MASK define 3045 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3046 3047 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3048 3049 address handler = (sa.sa_flags & SA_SIGINFO) 3050 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3051 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3052 3053 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3054 st->print("SIG_DFL"); 3055 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3056 st->print("SIG_IGN"); 3057 } else { 3058 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3059 } 3060 3061 st->print(", sa_mask[0]="); 3062 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3063 3064 address rh = VMError::get_resetted_sighandler(sig); 3065 // May be, handler was resetted by VMError? 3066 if (rh != NULL) { 3067 handler = rh; 3068 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3069 } 3070 3071 st->print(", sa_flags="); 3072 os::Posix::print_sa_flags(st, sa.sa_flags); 3073 3074 // Check: is it our handler? 3075 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3076 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3077 // It is our signal handler 3078 // check for flags, reset system-used one! 3079 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3080 st->print( 3081 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3082 os::Bsd::get_our_sigflags(sig)); 3083 } 3084 } 3085 st->cr(); 3086 } 3087 3088 3089 #define DO_SIGNAL_CHECK(sig) \ 3090 do { \ 3091 if (!sigismember(&check_signal_done, sig)) { \ 3092 os::Bsd::check_signal_handler(sig); \ 3093 } \ 3094 } while (0) 3095 3096 // This method is a periodic task to check for misbehaving JNI applications 3097 // under CheckJNI, we can add any periodic checks here 3098 3099 void os::run_periodic_checks() { 3100 3101 if (check_signals == false) return; 3102 3103 // SEGV and BUS if overridden could potentially prevent 3104 // generation of hs*.log in the event of a crash, debugging 3105 // such a case can be very challenging, so we absolutely 3106 // check the following for a good measure: 3107 DO_SIGNAL_CHECK(SIGSEGV); 3108 DO_SIGNAL_CHECK(SIGILL); 3109 DO_SIGNAL_CHECK(SIGFPE); 3110 DO_SIGNAL_CHECK(SIGBUS); 3111 DO_SIGNAL_CHECK(SIGPIPE); 3112 DO_SIGNAL_CHECK(SIGXFSZ); 3113 3114 3115 // ReduceSignalUsage allows the user to override these handlers 3116 // see comments at the very top and jvm_md.h 3117 if (!ReduceSignalUsage) { 3118 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3119 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3120 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3121 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3122 } 3123 3124 DO_SIGNAL_CHECK(SR_signum); 3125 } 3126 3127 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3128 3129 static os_sigaction_t os_sigaction = NULL; 3130 3131 void os::Bsd::check_signal_handler(int sig) { 3132 char buf[O_BUFLEN]; 3133 address jvmHandler = NULL; 3134 3135 3136 struct sigaction act; 3137 if (os_sigaction == NULL) { 3138 // only trust the default sigaction, in case it has been interposed 3139 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3140 if (os_sigaction == NULL) return; 3141 } 3142 3143 os_sigaction(sig, (struct sigaction*)NULL, &act); 3144 3145 3146 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3147 3148 address thisHandler = (act.sa_flags & SA_SIGINFO) 3149 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3150 : CAST_FROM_FN_PTR(address, act.sa_handler); 3151 3152 3153 switch (sig) { 3154 case SIGSEGV: 3155 case SIGBUS: 3156 case SIGFPE: 3157 case SIGPIPE: 3158 case SIGILL: 3159 case SIGXFSZ: 3160 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3161 break; 3162 3163 case SHUTDOWN1_SIGNAL: 3164 case SHUTDOWN2_SIGNAL: 3165 case SHUTDOWN3_SIGNAL: 3166 case BREAK_SIGNAL: 3167 jvmHandler = (address)user_handler(); 3168 break; 3169 3170 default: 3171 if (sig == SR_signum) { 3172 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3173 } else { 3174 return; 3175 } 3176 break; 3177 } 3178 3179 if (thisHandler != jvmHandler) { 3180 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3181 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3182 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3183 // No need to check this sig any longer 3184 sigaddset(&check_signal_done, sig); 3185 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3186 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3187 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3188 exception_name(sig, buf, O_BUFLEN)); 3189 } 3190 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3191 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3192 tty->print("expected:"); 3193 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3194 tty->cr(); 3195 tty->print(" found:"); 3196 os::Posix::print_sa_flags(tty, act.sa_flags); 3197 tty->cr(); 3198 // No need to check this sig any longer 3199 sigaddset(&check_signal_done, sig); 3200 } 3201 3202 // Dump all the signal 3203 if (sigismember(&check_signal_done, sig)) { 3204 print_signal_handlers(tty, buf, O_BUFLEN); 3205 } 3206 } 3207 3208 extern void report_error(char* file_name, int line_no, char* title, 3209 char* format, ...); 3210 3211 // this is called _before_ the most of global arguments have been parsed 3212 void os::init(void) { 3213 char dummy; // used to get a guess on initial stack address 3214 3215 // With BsdThreads the JavaMain thread pid (primordial thread) 3216 // is different than the pid of the java launcher thread. 3217 // So, on Bsd, the launcher thread pid is passed to the VM 3218 // via the sun.java.launcher.pid property. 3219 // Use this property instead of getpid() if it was correctly passed. 3220 // See bug 6351349. 3221 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3222 3223 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3224 3225 clock_tics_per_sec = CLK_TCK; 3226 3227 init_random(1234567); 3228 3229 Bsd::set_page_size(getpagesize()); 3230 if (Bsd::page_size() == -1) { 3231 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3232 } 3233 init_page_sizes((size_t) Bsd::page_size()); 3234 3235 Bsd::initialize_system_info(); 3236 3237 // _main_thread points to the thread that created/loaded the JVM. 3238 Bsd::_main_thread = pthread_self(); 3239 3240 Bsd::clock_init(); 3241 initial_time_count = javaTimeNanos(); 3242 3243 #ifdef __APPLE__ 3244 // XXXDARWIN 3245 // Work around the unaligned VM callbacks in hotspot's 3246 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3247 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3248 // alignment when doing symbol lookup. To work around this, we force early 3249 // binding of all symbols now, thus binding when alignment is known-good. 3250 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3251 #endif 3252 3253 os::Posix::init(); 3254 } 3255 3256 // To install functions for atexit system call 3257 extern "C" { 3258 static void perfMemory_exit_helper() { 3259 perfMemory_exit(); 3260 } 3261 } 3262 3263 // this is called _after_ the global arguments have been parsed 3264 jint os::init_2(void) { 3265 3266 os::Posix::init_2(); 3267 3268 // initialize suspend/resume support - must do this before signal_sets_init() 3269 if (SR_initialize() != 0) { 3270 perror("SR_initialize failed"); 3271 return JNI_ERR; 3272 } 3273 3274 Bsd::signal_sets_init(); 3275 Bsd::install_signal_handlers(); 3276 // Initialize data for jdk.internal.misc.Signal 3277 if (!ReduceSignalUsage) { 3278 jdk_misc_signal_init(); 3279 } 3280 3281 // Check and sets minimum stack sizes against command line options 3282 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3283 return JNI_ERR; 3284 } 3285 3286 if (MaxFDLimit) { 3287 // set the number of file descriptors to max. print out error 3288 // if getrlimit/setrlimit fails but continue regardless. 3289 struct rlimit nbr_files; 3290 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3291 if (status != 0) { 3292 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3293 } else { 3294 nbr_files.rlim_cur = nbr_files.rlim_max; 3295 3296 #ifdef __APPLE__ 3297 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3298 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3299 // be used instead 3300 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3301 #endif 3302 3303 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3304 if (status != 0) { 3305 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3306 } 3307 } 3308 } 3309 3310 // at-exit methods are called in the reverse order of their registration. 3311 // atexit functions are called on return from main or as a result of a 3312 // call to exit(3C). There can be only 32 of these functions registered 3313 // and atexit() does not set errno. 3314 3315 if (PerfAllowAtExitRegistration) { 3316 // only register atexit functions if PerfAllowAtExitRegistration is set. 3317 // atexit functions can be delayed until process exit time, which 3318 // can be problematic for embedded VM situations. Embedded VMs should 3319 // call DestroyJavaVM() to assure that VM resources are released. 3320 3321 // note: perfMemory_exit_helper atexit function may be removed in 3322 // the future if the appropriate cleanup code can be added to the 3323 // VM_Exit VMOperation's doit method. 3324 if (atexit(perfMemory_exit_helper) != 0) { 3325 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3326 } 3327 } 3328 3329 // initialize thread priority policy 3330 prio_init(); 3331 3332 #ifdef __APPLE__ 3333 // dynamically link to objective c gc registration 3334 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3335 if (handleLibObjc != NULL) { 3336 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3337 } 3338 #endif 3339 3340 return JNI_OK; 3341 } 3342 3343 // Mark the polling page as unreadable 3344 void os::make_polling_page_unreadable(void) { 3345 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3346 fatal("Could not disable polling page"); 3347 } 3348 } 3349 3350 // Mark the polling page as readable 3351 void os::make_polling_page_readable(void) { 3352 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3353 fatal("Could not enable polling page"); 3354 } 3355 } 3356 3357 int os::active_processor_count() { 3358 // User has overridden the number of active processors 3359 if (ActiveProcessorCount > 0) { 3360 log_trace(os)("active_processor_count: " 3361 "active processor count set by user : %d", 3362 ActiveProcessorCount); 3363 return ActiveProcessorCount; 3364 } 3365 3366 return _processor_count; 3367 } 3368 3369 void os::set_native_thread_name(const char *name) { 3370 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3371 // This is only supported in Snow Leopard and beyond 3372 if (name != NULL) { 3373 // Add a "Java: " prefix to the name 3374 char buf[MAXTHREADNAMESIZE]; 3375 snprintf(buf, sizeof(buf), "Java: %s", name); 3376 pthread_setname_np(buf); 3377 } 3378 #endif 3379 } 3380 3381 bool os::distribute_processes(uint length, uint* distribution) { 3382 // Not yet implemented. 3383 return false; 3384 } 3385 3386 bool os::bind_to_processor(uint processor_id) { 3387 // Not yet implemented. 3388 return false; 3389 } 3390 3391 void os::SuspendedThreadTask::internal_do_task() { 3392 if (do_suspend(_thread->osthread())) { 3393 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3394 do_task(context); 3395 do_resume(_thread->osthread()); 3396 } 3397 } 3398 3399 //////////////////////////////////////////////////////////////////////////////// 3400 // debug support 3401 3402 bool os::find(address addr, outputStream* st) { 3403 Dl_info dlinfo; 3404 memset(&dlinfo, 0, sizeof(dlinfo)); 3405 if (dladdr(addr, &dlinfo) != 0) { 3406 st->print(INTPTR_FORMAT ": ", (intptr_t)addr); 3407 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3408 st->print("%s+%#x", dlinfo.dli_sname, 3409 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr)); 3410 } else if (dlinfo.dli_fbase != NULL) { 3411 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase)); 3412 } else { 3413 st->print("<absolute address>"); 3414 } 3415 if (dlinfo.dli_fname != NULL) { 3416 st->print(" in %s", dlinfo.dli_fname); 3417 } 3418 if (dlinfo.dli_fbase != NULL) { 3419 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase); 3420 } 3421 st->cr(); 3422 3423 if (Verbose) { 3424 // decode some bytes around the PC 3425 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3426 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3427 address lowest = (address) dlinfo.dli_sname; 3428 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3429 if (begin < lowest) begin = lowest; 3430 Dl_info dlinfo2; 3431 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3432 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3433 end = (address) dlinfo2.dli_saddr; 3434 } 3435 Disassembler::decode(begin, end, st); 3436 } 3437 return true; 3438 } 3439 return false; 3440 } 3441 3442 //////////////////////////////////////////////////////////////////////////////// 3443 // misc 3444 3445 // This does not do anything on Bsd. This is basically a hook for being 3446 // able to use structured exception handling (thread-local exception filters) 3447 // on, e.g., Win32. 3448 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3449 const methodHandle& method, JavaCallArguments* args, 3450 Thread* thread) { 3451 f(value, method, args, thread); 3452 } 3453 3454 void os::print_statistics() { 3455 } 3456 3457 bool os::message_box(const char* title, const char* message) { 3458 int i; 3459 fdStream err(defaultStream::error_fd()); 3460 for (i = 0; i < 78; i++) err.print_raw("="); 3461 err.cr(); 3462 err.print_raw_cr(title); 3463 for (i = 0; i < 78; i++) err.print_raw("-"); 3464 err.cr(); 3465 err.print_raw_cr(message); 3466 for (i = 0; i < 78; i++) err.print_raw("="); 3467 err.cr(); 3468 3469 char buf[16]; 3470 // Prevent process from exiting upon "read error" without consuming all CPU 3471 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3472 3473 return buf[0] == 'y' || buf[0] == 'Y'; 3474 } 3475 3476 static inline struct timespec get_mtime(const char* filename) { 3477 struct stat st; 3478 int ret = os::stat(filename, &st); 3479 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3480 #ifdef __APPLE__ 3481 return st.st_mtimespec; 3482 #else 3483 return st.st_mtim; 3484 #endif 3485 } 3486 3487 int os::compare_file_modified_times(const char* file1, const char* file2) { 3488 struct timespec filetime1 = get_mtime(file1); 3489 struct timespec filetime2 = get_mtime(file2); 3490 int diff = filetime1.tv_sec - filetime2.tv_sec; 3491 if (diff == 0) { 3492 return filetime1.tv_nsec - filetime2.tv_nsec; 3493 } 3494 return diff; 3495 } 3496 3497 // Is a (classpath) directory empty? 3498 bool os::dir_is_empty(const char* path) { 3499 DIR *dir = NULL; 3500 struct dirent *ptr; 3501 3502 dir = opendir(path); 3503 if (dir == NULL) return true; 3504 3505 // Scan the directory 3506 bool result = true; 3507 while (result && (ptr = readdir(dir)) != NULL) { 3508 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3509 result = false; 3510 } 3511 } 3512 closedir(dir); 3513 return result; 3514 } 3515 3516 // This code originates from JDK's sysOpen and open64_w 3517 // from src/solaris/hpi/src/system_md.c 3518 3519 int os::open(const char *path, int oflag, int mode) { 3520 if (strlen(path) > MAX_PATH - 1) { 3521 errno = ENAMETOOLONG; 3522 return -1; 3523 } 3524 int fd; 3525 3526 fd = ::open(path, oflag, mode); 3527 if (fd == -1) return -1; 3528 3529 // If the open succeeded, the file might still be a directory 3530 { 3531 struct stat buf; 3532 int ret = ::fstat(fd, &buf); 3533 int st_mode = buf.st_mode; 3534 3535 if (ret != -1) { 3536 if ((st_mode & S_IFMT) == S_IFDIR) { 3537 errno = EISDIR; 3538 ::close(fd); 3539 return -1; 3540 } 3541 } else { 3542 ::close(fd); 3543 return -1; 3544 } 3545 } 3546 3547 // All file descriptors that are opened in the JVM and not 3548 // specifically destined for a subprocess should have the 3549 // close-on-exec flag set. If we don't set it, then careless 3rd 3550 // party native code might fork and exec without closing all 3551 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3552 // UNIXProcess.c), and this in turn might: 3553 // 3554 // - cause end-of-file to fail to be detected on some file 3555 // descriptors, resulting in mysterious hangs, or 3556 // 3557 // - might cause an fopen in the subprocess to fail on a system 3558 // suffering from bug 1085341. 3559 // 3560 // (Yes, the default setting of the close-on-exec flag is a Unix 3561 // design flaw) 3562 // 3563 // See: 3564 // 1085341: 32-bit stdio routines should support file descriptors >255 3565 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3566 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3567 // 3568 #ifdef FD_CLOEXEC 3569 { 3570 int flags = ::fcntl(fd, F_GETFD); 3571 if (flags != -1) { 3572 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3573 } 3574 } 3575 #endif 3576 3577 return fd; 3578 } 3579 3580 3581 // create binary file, rewriting existing file if required 3582 int os::create_binary_file(const char* path, bool rewrite_existing) { 3583 int oflags = O_WRONLY | O_CREAT; 3584 if (!rewrite_existing) { 3585 oflags |= O_EXCL; 3586 } 3587 return ::open(path, oflags, S_IREAD | S_IWRITE); 3588 } 3589 3590 // return current position of file pointer 3591 jlong os::current_file_offset(int fd) { 3592 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3593 } 3594 3595 // move file pointer to the specified offset 3596 jlong os::seek_to_file_offset(int fd, jlong offset) { 3597 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3598 } 3599 3600 // This code originates from JDK's sysAvailable 3601 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3602 3603 int os::available(int fd, jlong *bytes) { 3604 jlong cur, end; 3605 int mode; 3606 struct stat buf; 3607 3608 if (::fstat(fd, &buf) >= 0) { 3609 mode = buf.st_mode; 3610 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3611 int n; 3612 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3613 *bytes = n; 3614 return 1; 3615 } 3616 } 3617 } 3618 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3619 return 0; 3620 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3621 return 0; 3622 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3623 return 0; 3624 } 3625 *bytes = end - cur; 3626 return 1; 3627 } 3628 3629 // Map a block of memory. 3630 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3631 char *addr, size_t bytes, bool read_only, 3632 bool allow_exec) { 3633 int prot; 3634 int flags; 3635 3636 if (read_only) { 3637 prot = PROT_READ; 3638 flags = MAP_SHARED; 3639 } else { 3640 prot = PROT_READ | PROT_WRITE; 3641 flags = MAP_PRIVATE; 3642 } 3643 3644 if (allow_exec) { 3645 prot |= PROT_EXEC; 3646 } 3647 3648 if (addr != NULL) { 3649 flags |= MAP_FIXED; 3650 } 3651 3652 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3653 fd, file_offset); 3654 if (mapped_address == MAP_FAILED) { 3655 return NULL; 3656 } 3657 return mapped_address; 3658 } 3659 3660 3661 // Remap a block of memory. 3662 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3663 char *addr, size_t bytes, bool read_only, 3664 bool allow_exec) { 3665 // same as map_memory() on this OS 3666 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3667 allow_exec); 3668 } 3669 3670 3671 // Unmap a block of memory. 3672 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3673 return munmap(addr, bytes) == 0; 3674 } 3675 3676 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3677 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3678 // of a thread. 3679 // 3680 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3681 // the fast estimate available on the platform. 3682 3683 jlong os::current_thread_cpu_time() { 3684 #ifdef __APPLE__ 3685 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3686 #else 3687 Unimplemented(); 3688 return 0; 3689 #endif 3690 } 3691 3692 jlong os::thread_cpu_time(Thread* thread) { 3693 #ifdef __APPLE__ 3694 return os::thread_cpu_time(thread, true /* user + sys */); 3695 #else 3696 Unimplemented(); 3697 return 0; 3698 #endif 3699 } 3700 3701 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3702 #ifdef __APPLE__ 3703 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3704 #else 3705 Unimplemented(); 3706 return 0; 3707 #endif 3708 } 3709 3710 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3711 #ifdef __APPLE__ 3712 struct thread_basic_info tinfo; 3713 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3714 kern_return_t kr; 3715 thread_t mach_thread; 3716 3717 mach_thread = thread->osthread()->thread_id(); 3718 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3719 if (kr != KERN_SUCCESS) { 3720 return -1; 3721 } 3722 3723 if (user_sys_cpu_time) { 3724 jlong nanos; 3725 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3726 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3727 return nanos; 3728 } else { 3729 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3730 } 3731 #else 3732 Unimplemented(); 3733 return 0; 3734 #endif 3735 } 3736 3737 3738 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3739 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3740 info_ptr->may_skip_backward = false; // elapsed time not wall time 3741 info_ptr->may_skip_forward = false; // elapsed time not wall time 3742 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3743 } 3744 3745 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3746 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3747 info_ptr->may_skip_backward = false; // elapsed time not wall time 3748 info_ptr->may_skip_forward = false; // elapsed time not wall time 3749 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3750 } 3751 3752 bool os::is_thread_cpu_time_supported() { 3753 #ifdef __APPLE__ 3754 return true; 3755 #else 3756 return false; 3757 #endif 3758 } 3759 3760 // System loadavg support. Returns -1 if load average cannot be obtained. 3761 // Bsd doesn't yet have a (official) notion of processor sets, 3762 // so just return the system wide load average. 3763 int os::loadavg(double loadavg[], int nelem) { 3764 return ::getloadavg(loadavg, nelem); 3765 } 3766 3767 void os::pause() { 3768 char filename[MAX_PATH]; 3769 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3770 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3771 } else { 3772 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3773 } 3774 3775 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3776 if (fd != -1) { 3777 struct stat buf; 3778 ::close(fd); 3779 while (::stat(filename, &buf) == 0) { 3780 (void)::poll(NULL, 0, 100); 3781 } 3782 } else { 3783 jio_fprintf(stderr, 3784 "Could not open pause file '%s', continuing immediately.\n", filename); 3785 } 3786 } 3787 3788 // Darwin has no "environ" in a dynamic library. 3789 #ifdef __APPLE__ 3790 #include <crt_externs.h> 3791 #define environ (*_NSGetEnviron()) 3792 #else 3793 extern char** environ; 3794 #endif 3795 3796 // Run the specified command in a separate process. Return its exit value, 3797 // or -1 on failure (e.g. can't fork a new process). 3798 // Unlike system(), this function can be called from signal handler. It 3799 // doesn't block SIGINT et al. 3800 int os::fork_and_exec(char* cmd) { 3801 const char * argv[4] = {"sh", "-c", cmd, NULL}; 3802 3803 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 3804 // pthread_atfork handlers and reset pthread library. All we need is a 3805 // separate process to execve. Make a direct syscall to fork process. 3806 // On IA64 there's no fork syscall, we have to use fork() and hope for 3807 // the best... 3808 pid_t pid = fork(); 3809 3810 if (pid < 0) { 3811 // fork failed 3812 return -1; 3813 3814 } else if (pid == 0) { 3815 // child process 3816 3817 // execve() in BsdThreads will call pthread_kill_other_threads_np() 3818 // first to kill every thread on the thread list. Because this list is 3819 // not reset by fork() (see notes above), execve() will instead kill 3820 // every thread in the parent process. We know this is the only thread 3821 // in the new process, so make a system call directly. 3822 // IA64 should use normal execve() from glibc to match the glibc fork() 3823 // above. 3824 execve("/bin/sh", (char* const*)argv, environ); 3825 3826 // execve failed 3827 _exit(-1); 3828 3829 } else { 3830 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 3831 // care about the actual exit code, for now. 3832 3833 int status; 3834 3835 // Wait for the child process to exit. This returns immediately if 3836 // the child has already exited. */ 3837 while (waitpid(pid, &status, 0) < 0) { 3838 switch (errno) { 3839 case ECHILD: return 0; 3840 case EINTR: break; 3841 default: return -1; 3842 } 3843 } 3844 3845 if (WIFEXITED(status)) { 3846 // The child exited normally; get its exit code. 3847 return WEXITSTATUS(status); 3848 } else if (WIFSIGNALED(status)) { 3849 // The child exited because of a signal 3850 // The best value to return is 0x80 + signal number, 3851 // because that is what all Unix shells do, and because 3852 // it allows callers to distinguish between process exit and 3853 // process death by signal. 3854 return 0x80 + WTERMSIG(status); 3855 } else { 3856 // Unknown exit code; pass it through 3857 return status; 3858 } 3859 } 3860 } 3861 3862 // Get the default path to the core file 3863 // Returns the length of the string 3864 int os::get_core_path(char* buffer, size_t bufferSize) { 3865 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 3866 3867 // Truncate if theoretical string was longer than bufferSize 3868 n = MIN2(n, (int)bufferSize); 3869 3870 return n; 3871 } 3872 3873 #ifndef PRODUCT 3874 void TestReserveMemorySpecial_test() { 3875 // No tests available for this platform 3876 } 3877 #endif 3878 3879 bool os::start_debugging(char *buf, int buflen) { 3880 int len = (int)strlen(buf); 3881 char *p = &buf[len]; 3882 3883 jio_snprintf(p, buflen-len, 3884 "\n\n" 3885 "Do you want to debug the problem?\n\n" 3886 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 3887 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 3888 "Otherwise, press RETURN to abort...", 3889 os::current_process_id(), os::current_process_id(), 3890 os::current_thread_id(), os::current_thread_id()); 3891 3892 bool yes = os::message_box("Unexpected Error", buf); 3893 3894 if (yes) { 3895 // yes, user asked VM to launch debugger 3896 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 3897 os::current_process_id(), os::current_process_id()); 3898 3899 os::fork_and_exec(buf); 3900 yes = false; 3901 } 3902 return yes; 3903 }