1 /* 2 * Copyright (c) 1999, 2017, 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.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.inline.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 bool os::Bsd::is_sig_ignored(int sig) { 537 struct sigaction oact; 538 sigaction(sig, (struct sigaction*)NULL, &oact); 539 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 540 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 541 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 542 return true; 543 } else { 544 return false; 545 } 546 } 547 548 void os::Bsd::signal_sets_init() { 549 // Should also have an assertion stating we are still single-threaded. 550 assert(!signal_sets_initialized, "Already initialized"); 551 // Fill in signals that are necessarily unblocked for all threads in 552 // the VM. Currently, we unblock the following signals: 553 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 554 // by -Xrs (=ReduceSignalUsage)); 555 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 556 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 557 // the dispositions or masks wrt these signals. 558 // Programs embedding the VM that want to use the above signals for their 559 // own purposes must, at this time, use the "-Xrs" option to prevent 560 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 561 // (See bug 4345157, and other related bugs). 562 // In reality, though, unblocking these signals is really a nop, since 563 // these signals are not blocked by default. 564 sigemptyset(&unblocked_sigs); 565 sigaddset(&unblocked_sigs, SIGILL); 566 sigaddset(&unblocked_sigs, SIGSEGV); 567 sigaddset(&unblocked_sigs, SIGBUS); 568 sigaddset(&unblocked_sigs, SIGFPE); 569 sigaddset(&unblocked_sigs, SR_signum); 570 571 if (!ReduceSignalUsage) { 572 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 573 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 574 575 } 576 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 577 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 578 } 579 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 580 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 581 } 582 } 583 // Fill in signals that are blocked by all but the VM thread. 584 sigemptyset(&vm_sigs); 585 if (!ReduceSignalUsage) { 586 sigaddset(&vm_sigs, BREAK_SIGNAL); 587 } 588 debug_only(signal_sets_initialized = true); 589 590 } 591 592 // These are signals that are unblocked while a thread is running Java. 593 // (For some reason, they get blocked by default.) 594 sigset_t* os::Bsd::unblocked_signals() { 595 assert(signal_sets_initialized, "Not initialized"); 596 return &unblocked_sigs; 597 } 598 599 // These are the signals that are blocked while a (non-VM) thread is 600 // running Java. Only the VM thread handles these signals. 601 sigset_t* os::Bsd::vm_signals() { 602 assert(signal_sets_initialized, "Not initialized"); 603 return &vm_sigs; 604 } 605 606 void os::Bsd::hotspot_sigmask(Thread* thread) { 607 608 //Save caller's signal mask before setting VM signal mask 609 sigset_t caller_sigmask; 610 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 611 612 OSThread* osthread = thread->osthread(); 613 osthread->set_caller_sigmask(caller_sigmask); 614 615 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 616 617 if (!ReduceSignalUsage) { 618 if (thread->is_VM_thread()) { 619 // Only the VM thread handles BREAK_SIGNAL ... 620 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 621 } else { 622 // ... all other threads block BREAK_SIGNAL 623 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 624 } 625 } 626 } 627 628 629 ////////////////////////////////////////////////////////////////////////////// 630 // create new thread 631 632 #ifdef __APPLE__ 633 // library handle for calling objc_registerThreadWithCollector() 634 // without static linking to the libobjc library 635 #define OBJC_LIB "/usr/lib/libobjc.dylib" 636 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 637 typedef void (*objc_registerThreadWithCollector_t)(); 638 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 639 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 640 #endif 641 642 #ifdef __APPLE__ 643 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 644 // Additional thread_id used to correlate threads in SA 645 thread_identifier_info_data_t m_ident_info; 646 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 647 648 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 649 (thread_info_t) &m_ident_info, &count); 650 651 return m_ident_info.thread_id; 652 } 653 #endif 654 655 // Thread start routine for all newly created threads 656 static void *thread_native_entry(Thread *thread) { 657 // Try to randomize the cache line index of hot stack frames. 658 // This helps when threads of the same stack traces evict each other's 659 // cache lines. The threads can be either from the same JVM instance, or 660 // from different JVM instances. The benefit is especially true for 661 // processors with hyperthreading technology. 662 static int counter = 0; 663 int pid = os::current_process_id(); 664 alloca(((pid ^ counter++) & 7) * 128); 665 666 thread->initialize_thread_current(); 667 668 OSThread* osthread = thread->osthread(); 669 Monitor* sync = osthread->startThread_lock(); 670 671 osthread->set_thread_id(os::Bsd::gettid()); 672 673 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 674 os::current_thread_id(), (uintx) pthread_self()); 675 676 #ifdef __APPLE__ 677 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 678 guarantee(unique_thread_id != 0, "unique thread id was not found"); 679 osthread->set_unique_thread_id(unique_thread_id); 680 #endif 681 // initialize signal mask for this thread 682 os::Bsd::hotspot_sigmask(thread); 683 684 // initialize floating point control register 685 os::Bsd::init_thread_fpu_state(); 686 687 #ifdef __APPLE__ 688 // register thread with objc gc 689 if (objc_registerThreadWithCollectorFunction != NULL) { 690 objc_registerThreadWithCollectorFunction(); 691 } 692 #endif 693 694 // handshaking with parent thread 695 { 696 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 697 698 // notify parent thread 699 osthread->set_state(INITIALIZED); 700 sync->notify_all(); 701 702 // wait until os::start_thread() 703 while (osthread->get_state() == INITIALIZED) { 704 sync->wait(Mutex::_no_safepoint_check_flag); 705 } 706 } 707 708 // call one more level start routine 709 thread->run(); 710 711 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 712 os::current_thread_id(), (uintx) pthread_self()); 713 714 // If a thread has not deleted itself ("delete this") as part of its 715 // termination sequence, we have to ensure thread-local-storage is 716 // cleared before we actually terminate. No threads should ever be 717 // deleted asynchronously with respect to their termination. 718 if (Thread::current_or_null_safe() != NULL) { 719 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 720 thread->clear_thread_current(); 721 } 722 723 return 0; 724 } 725 726 bool os::create_thread(Thread* thread, ThreadType thr_type, 727 size_t req_stack_size) { 728 assert(thread->osthread() == NULL, "caller responsible"); 729 730 // Allocate the OSThread object 731 OSThread* osthread = new OSThread(NULL, NULL); 732 if (osthread == NULL) { 733 return false; 734 } 735 736 // set the correct thread state 737 osthread->set_thread_type(thr_type); 738 739 // Initial state is ALLOCATED but not INITIALIZED 740 osthread->set_state(ALLOCATED); 741 742 thread->set_osthread(osthread); 743 744 // init thread attributes 745 pthread_attr_t attr; 746 pthread_attr_init(&attr); 747 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 748 749 // calculate stack size if it's not specified by caller 750 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 751 int status = pthread_attr_setstacksize(&attr, stack_size); 752 assert_status(status == 0, status, "pthread_attr_setstacksize"); 753 754 ThreadState state; 755 756 { 757 pthread_t tid; 758 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 759 760 char buf[64]; 761 if (ret == 0) { 762 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 763 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 764 } else { 765 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 766 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 767 } 768 769 pthread_attr_destroy(&attr); 770 771 if (ret != 0) { 772 // Need to clean up stuff we've allocated so far 773 thread->set_osthread(NULL); 774 delete osthread; 775 return false; 776 } 777 778 // Store pthread info into the OSThread 779 osthread->set_pthread_id(tid); 780 781 // Wait until child thread is either initialized or aborted 782 { 783 Monitor* sync_with_child = osthread->startThread_lock(); 784 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 785 while ((state = osthread->get_state()) == ALLOCATED) { 786 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 787 } 788 } 789 790 } 791 792 // Aborted due to thread limit being reached 793 if (state == ZOMBIE) { 794 thread->set_osthread(NULL); 795 delete osthread; 796 return false; 797 } 798 799 // The thread is returned suspended (in state INITIALIZED), 800 // and is started higher up in the call chain 801 assert(state == INITIALIZED, "race condition"); 802 return true; 803 } 804 805 ///////////////////////////////////////////////////////////////////////////// 806 // attach existing thread 807 808 // bootstrap the main thread 809 bool os::create_main_thread(JavaThread* thread) { 810 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 811 return create_attached_thread(thread); 812 } 813 814 bool os::create_attached_thread(JavaThread* thread) { 815 #ifdef ASSERT 816 thread->verify_not_published(); 817 #endif 818 819 // Allocate the OSThread object 820 OSThread* osthread = new OSThread(NULL, NULL); 821 822 if (osthread == NULL) { 823 return false; 824 } 825 826 osthread->set_thread_id(os::Bsd::gettid()); 827 828 // Store pthread info into the OSThread 829 #ifdef __APPLE__ 830 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 831 guarantee(unique_thread_id != 0, "just checking"); 832 osthread->set_unique_thread_id(unique_thread_id); 833 #endif 834 osthread->set_pthread_id(::pthread_self()); 835 836 // initialize floating point control register 837 os::Bsd::init_thread_fpu_state(); 838 839 // Initial thread state is RUNNABLE 840 osthread->set_state(RUNNABLE); 841 842 thread->set_osthread(osthread); 843 844 // initialize signal mask for this thread 845 // and save the caller's signal mask 846 os::Bsd::hotspot_sigmask(thread); 847 848 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 849 os::current_thread_id(), (uintx) pthread_self()); 850 851 return true; 852 } 853 854 void os::pd_start_thread(Thread* thread) { 855 OSThread * osthread = thread->osthread(); 856 assert(osthread->get_state() != INITIALIZED, "just checking"); 857 Monitor* sync_with_child = osthread->startThread_lock(); 858 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 859 sync_with_child->notify(); 860 } 861 862 // Free Bsd resources related to the OSThread 863 void os::free_thread(OSThread* osthread) { 864 assert(osthread != NULL, "osthread not set"); 865 866 // We are told to free resources of the argument thread, 867 // but we can only really operate on the current thread. 868 assert(Thread::current()->osthread() == osthread, 869 "os::free_thread but not current thread"); 870 871 // Restore caller's signal mask 872 sigset_t sigmask = osthread->caller_sigmask(); 873 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 874 875 delete osthread; 876 } 877 878 //////////////////////////////////////////////////////////////////////////////// 879 // time support 880 881 // Time since start-up in seconds to a fine granularity. 882 // Used by VMSelfDestructTimer and the MemProfiler. 883 double os::elapsedTime() { 884 885 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 886 } 887 888 jlong os::elapsed_counter() { 889 return javaTimeNanos() - initial_time_count; 890 } 891 892 jlong os::elapsed_frequency() { 893 return NANOSECS_PER_SEC; // nanosecond resolution 894 } 895 896 bool os::supports_vtime() { return true; } 897 bool os::enable_vtime() { return false; } 898 bool os::vtime_enabled() { return false; } 899 900 double os::elapsedVTime() { 901 // better than nothing, but not much 902 return elapsedTime(); 903 } 904 905 jlong os::javaTimeMillis() { 906 timeval time; 907 int status = gettimeofday(&time, NULL); 908 assert(status != -1, "bsd error"); 909 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 910 } 911 912 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 913 timeval time; 914 int status = gettimeofday(&time, NULL); 915 assert(status != -1, "bsd error"); 916 seconds = jlong(time.tv_sec); 917 nanos = jlong(time.tv_usec) * 1000; 918 } 919 920 #ifndef __APPLE__ 921 #ifndef CLOCK_MONOTONIC 922 #define CLOCK_MONOTONIC (1) 923 #endif 924 #endif 925 926 #ifdef __APPLE__ 927 void os::Bsd::clock_init() { 928 mach_timebase_info(&_timebase_info); 929 } 930 #else 931 void os::Bsd::clock_init() { 932 struct timespec res; 933 struct timespec tp; 934 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 935 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 936 // yes, monotonic clock is supported 937 _clock_gettime = ::clock_gettime; 938 } 939 } 940 #endif 941 942 943 944 #ifdef __APPLE__ 945 946 jlong os::javaTimeNanos() { 947 const uint64_t tm = mach_absolute_time(); 948 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 949 const uint64_t prev = Bsd::_max_abstime; 950 if (now <= prev) { 951 return prev; // same or retrograde time; 952 } 953 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev); 954 assert(obsv >= prev, "invariant"); // Monotonicity 955 // If the CAS succeeded then we're done and return "now". 956 // If the CAS failed and the observed value "obsv" is >= now then 957 // we should return "obsv". If the CAS failed and now > obsv > prv then 958 // some other thread raced this thread and installed a new value, in which case 959 // we could either (a) retry the entire operation, (b) retry trying to install now 960 // or (c) just return obsv. We use (c). No loop is required although in some cases 961 // we might discard a higher "now" value in deference to a slightly lower but freshly 962 // installed obsv value. That's entirely benign -- it admits no new orderings compared 963 // to (a) or (b) -- and greatly reduces coherence traffic. 964 // We might also condition (c) on the magnitude of the delta between obsv and now. 965 // Avoiding excessive CAS operations to hot RW locations is critical. 966 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 967 return (prev == obsv) ? now : obsv; 968 } 969 970 #else // __APPLE__ 971 972 jlong os::javaTimeNanos() { 973 if (os::supports_monotonic_clock()) { 974 struct timespec tp; 975 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 976 assert(status == 0, "gettime error"); 977 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 978 return result; 979 } else { 980 timeval time; 981 int status = gettimeofday(&time, NULL); 982 assert(status != -1, "bsd error"); 983 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 984 return 1000 * usecs; 985 } 986 } 987 988 #endif // __APPLE__ 989 990 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 991 if (os::supports_monotonic_clock()) { 992 info_ptr->max_value = ALL_64_BITS; 993 994 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 995 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 996 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 997 } else { 998 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 999 info_ptr->max_value = ALL_64_BITS; 1000 1001 // gettimeofday is a real time clock so it skips 1002 info_ptr->may_skip_backward = true; 1003 info_ptr->may_skip_forward = true; 1004 } 1005 1006 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1007 } 1008 1009 // Return the real, user, and system times in seconds from an 1010 // arbitrary fixed point in the past. 1011 bool os::getTimesSecs(double* process_real_time, 1012 double* process_user_time, 1013 double* process_system_time) { 1014 struct tms ticks; 1015 clock_t real_ticks = times(&ticks); 1016 1017 if (real_ticks == (clock_t) (-1)) { 1018 return false; 1019 } else { 1020 double ticks_per_second = (double) clock_tics_per_sec; 1021 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1022 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1023 *process_real_time = ((double) real_ticks) / ticks_per_second; 1024 1025 return true; 1026 } 1027 } 1028 1029 1030 char * os::local_time_string(char *buf, size_t buflen) { 1031 struct tm t; 1032 time_t long_time; 1033 time(&long_time); 1034 localtime_r(&long_time, &t); 1035 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1036 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1037 t.tm_hour, t.tm_min, t.tm_sec); 1038 return buf; 1039 } 1040 1041 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1042 return localtime_r(clock, res); 1043 } 1044 1045 //////////////////////////////////////////////////////////////////////////////// 1046 // runtime exit support 1047 1048 // Note: os::shutdown() might be called very early during initialization, or 1049 // called from signal handler. Before adding something to os::shutdown(), make 1050 // sure it is async-safe and can handle partially initialized VM. 1051 void os::shutdown() { 1052 1053 // allow PerfMemory to attempt cleanup of any persistent resources 1054 perfMemory_exit(); 1055 1056 // needs to remove object in file system 1057 AttachListener::abort(); 1058 1059 // flush buffered output, finish log files 1060 ostream_abort(); 1061 1062 // Check for abort hook 1063 abort_hook_t abort_hook = Arguments::abort_hook(); 1064 if (abort_hook != NULL) { 1065 abort_hook(); 1066 } 1067 1068 } 1069 1070 // Note: os::abort() might be called very early during initialization, or 1071 // called from signal handler. Before adding something to os::abort(), make 1072 // sure it is async-safe and can handle partially initialized VM. 1073 void os::abort(bool dump_core, void* siginfo, const void* context) { 1074 os::shutdown(); 1075 if (dump_core) { 1076 #ifndef PRODUCT 1077 fdStream out(defaultStream::output_fd()); 1078 out.print_raw("Current thread is "); 1079 char buf[16]; 1080 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1081 out.print_raw_cr(buf); 1082 out.print_raw_cr("Dumping core ..."); 1083 #endif 1084 ::abort(); // dump core 1085 } 1086 1087 ::exit(1); 1088 } 1089 1090 // Die immediately, no exit hook, no abort hook, no cleanup. 1091 void os::die() { 1092 // _exit() on BsdThreads only kills current thread 1093 ::abort(); 1094 } 1095 1096 // This method is a copy of JDK's sysGetLastErrorString 1097 // from src/solaris/hpi/src/system_md.c 1098 1099 size_t os::lasterror(char *buf, size_t len) { 1100 if (errno == 0) return 0; 1101 1102 const char *s = os::strerror(errno); 1103 size_t n = ::strlen(s); 1104 if (n >= len) { 1105 n = len - 1; 1106 } 1107 ::strncpy(buf, s, n); 1108 buf[n] = '\0'; 1109 return n; 1110 } 1111 1112 // Information of current thread in variety of formats 1113 pid_t os::Bsd::gettid() { 1114 int retval = -1; 1115 1116 #ifdef __APPLE__ //XNU kernel 1117 // despite the fact mach port is actually not a thread id use it 1118 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1119 retval = ::pthread_mach_thread_np(::pthread_self()); 1120 guarantee(retval != 0, "just checking"); 1121 return retval; 1122 1123 #else 1124 #ifdef __FreeBSD__ 1125 retval = syscall(SYS_thr_self); 1126 #else 1127 #ifdef __OpenBSD__ 1128 retval = syscall(SYS_getthrid); 1129 #else 1130 #ifdef __NetBSD__ 1131 retval = (pid_t) syscall(SYS__lwp_self); 1132 #endif 1133 #endif 1134 #endif 1135 #endif 1136 1137 if (retval == -1) { 1138 return getpid(); 1139 } 1140 } 1141 1142 intx os::current_thread_id() { 1143 #ifdef __APPLE__ 1144 return (intx)::pthread_mach_thread_np(::pthread_self()); 1145 #else 1146 return (intx)::pthread_self(); 1147 #endif 1148 } 1149 1150 int os::current_process_id() { 1151 1152 // Under the old bsd thread library, bsd gives each thread 1153 // its own process id. Because of this each thread will return 1154 // a different pid if this method were to return the result 1155 // of getpid(2). Bsd provides no api that returns the pid 1156 // of the launcher thread for the vm. This implementation 1157 // returns a unique pid, the pid of the launcher thread 1158 // that starts the vm 'process'. 1159 1160 // Under the NPTL, getpid() returns the same pid as the 1161 // launcher thread rather than a unique pid per thread. 1162 // Use gettid() if you want the old pre NPTL behaviour. 1163 1164 // if you are looking for the result of a call to getpid() that 1165 // returns a unique pid for the calling thread, then look at the 1166 // OSThread::thread_id() method in osThread_bsd.hpp file 1167 1168 return (int)(_initial_pid ? _initial_pid : getpid()); 1169 } 1170 1171 // DLL functions 1172 1173 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1174 1175 // This must be hard coded because it's the system's temporary 1176 // directory not the java application's temp directory, ala java.io.tmpdir. 1177 #ifdef __APPLE__ 1178 // macosx has a secure per-user temporary directory 1179 char temp_path_storage[PATH_MAX]; 1180 const char* os::get_temp_directory() { 1181 static char *temp_path = NULL; 1182 if (temp_path == NULL) { 1183 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1184 if (pathSize == 0 || pathSize > PATH_MAX) { 1185 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1186 } 1187 temp_path = temp_path_storage; 1188 } 1189 return temp_path; 1190 } 1191 #else // __APPLE__ 1192 const char* os::get_temp_directory() { return "/tmp"; } 1193 #endif // __APPLE__ 1194 1195 // check if addr is inside libjvm.so 1196 bool os::address_is_in_vm(address addr) { 1197 static address libjvm_base_addr; 1198 Dl_info dlinfo; 1199 1200 if (libjvm_base_addr == NULL) { 1201 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1202 libjvm_base_addr = (address)dlinfo.dli_fbase; 1203 } 1204 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1205 } 1206 1207 if (dladdr((void *)addr, &dlinfo) != 0) { 1208 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1209 } 1210 1211 return false; 1212 } 1213 1214 1215 #define MACH_MAXSYMLEN 256 1216 1217 bool os::dll_address_to_function_name(address addr, char *buf, 1218 int buflen, int *offset, 1219 bool demangle) { 1220 // buf is not optional, but offset is optional 1221 assert(buf != NULL, "sanity check"); 1222 1223 Dl_info dlinfo; 1224 char localbuf[MACH_MAXSYMLEN]; 1225 1226 if (dladdr((void*)addr, &dlinfo) != 0) { 1227 // see if we have a matching symbol 1228 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1229 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1230 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1231 } 1232 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1233 return true; 1234 } 1235 // no matching symbol so try for just file info 1236 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1237 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1238 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1239 return true; 1240 } 1241 } 1242 1243 // Handle non-dynamic manually: 1244 if (dlinfo.dli_fbase != NULL && 1245 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1246 dlinfo.dli_fbase)) { 1247 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1248 jio_snprintf(buf, buflen, "%s", localbuf); 1249 } 1250 return true; 1251 } 1252 } 1253 buf[0] = '\0'; 1254 if (offset != NULL) *offset = -1; 1255 return false; 1256 } 1257 1258 // ported from solaris version 1259 bool os::dll_address_to_library_name(address addr, char* buf, 1260 int buflen, int* offset) { 1261 // buf is not optional, but offset is optional 1262 assert(buf != NULL, "sanity check"); 1263 1264 Dl_info dlinfo; 1265 1266 if (dladdr((void*)addr, &dlinfo) != 0) { 1267 if (dlinfo.dli_fname != NULL) { 1268 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1269 } 1270 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1271 *offset = addr - (address)dlinfo.dli_fbase; 1272 } 1273 return true; 1274 } 1275 1276 buf[0] = '\0'; 1277 if (offset) *offset = -1; 1278 return false; 1279 } 1280 1281 // Loads .dll/.so and 1282 // in case of error it checks if .dll/.so was built for the 1283 // same architecture as Hotspot is running on 1284 1285 #ifdef __APPLE__ 1286 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1287 #ifdef STATIC_BUILD 1288 return os::get_default_process_handle(); 1289 #else 1290 void * result= ::dlopen(filename, RTLD_LAZY); 1291 if (result != NULL) { 1292 // Successful loading 1293 return result; 1294 } 1295 1296 // Read system error message into ebuf 1297 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1298 ebuf[ebuflen-1]='\0'; 1299 1300 return NULL; 1301 #endif // STATIC_BUILD 1302 } 1303 #else 1304 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1305 #ifdef STATIC_BUILD 1306 return os::get_default_process_handle(); 1307 #else 1308 void * result= ::dlopen(filename, RTLD_LAZY); 1309 if (result != NULL) { 1310 // Successful loading 1311 return result; 1312 } 1313 1314 Elf32_Ehdr elf_head; 1315 1316 // Read system error message into ebuf 1317 // It may or may not be overwritten below 1318 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1319 ebuf[ebuflen-1]='\0'; 1320 int diag_msg_max_length=ebuflen-strlen(ebuf); 1321 char* diag_msg_buf=ebuf+strlen(ebuf); 1322 1323 if (diag_msg_max_length==0) { 1324 // No more space in ebuf for additional diagnostics message 1325 return NULL; 1326 } 1327 1328 1329 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1330 1331 if (file_descriptor < 0) { 1332 // Can't open library, report dlerror() message 1333 return NULL; 1334 } 1335 1336 bool failed_to_read_elf_head= 1337 (sizeof(elf_head)!= 1338 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1339 1340 ::close(file_descriptor); 1341 if (failed_to_read_elf_head) { 1342 // file i/o error - report dlerror() msg 1343 return NULL; 1344 } 1345 1346 typedef struct { 1347 Elf32_Half code; // Actual value as defined in elf.h 1348 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1349 char elf_class; // 32 or 64 bit 1350 char endianess; // MSB or LSB 1351 char* name; // String representation 1352 } arch_t; 1353 1354 #ifndef EM_486 1355 #define EM_486 6 /* Intel 80486 */ 1356 #endif 1357 1358 #ifndef EM_MIPS_RS3_LE 1359 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1360 #endif 1361 1362 #ifndef EM_PPC64 1363 #define EM_PPC64 21 /* PowerPC64 */ 1364 #endif 1365 1366 #ifndef EM_S390 1367 #define EM_S390 22 /* IBM System/390 */ 1368 #endif 1369 1370 #ifndef EM_IA_64 1371 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1372 #endif 1373 1374 #ifndef EM_X86_64 1375 #define EM_X86_64 62 /* AMD x86-64 */ 1376 #endif 1377 1378 static const arch_t arch_array[]={ 1379 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1380 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1381 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1382 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1383 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1384 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1385 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1386 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1387 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1388 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1389 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1390 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1391 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1392 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1393 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1394 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1395 }; 1396 1397 #if (defined IA32) 1398 static Elf32_Half running_arch_code=EM_386; 1399 #elif (defined AMD64) 1400 static Elf32_Half running_arch_code=EM_X86_64; 1401 #elif (defined IA64) 1402 static Elf32_Half running_arch_code=EM_IA_64; 1403 #elif (defined __sparc) && (defined _LP64) 1404 static Elf32_Half running_arch_code=EM_SPARCV9; 1405 #elif (defined __sparc) && (!defined _LP64) 1406 static Elf32_Half running_arch_code=EM_SPARC; 1407 #elif (defined __powerpc64__) 1408 static Elf32_Half running_arch_code=EM_PPC64; 1409 #elif (defined __powerpc__) 1410 static Elf32_Half running_arch_code=EM_PPC; 1411 #elif (defined ARM) 1412 static Elf32_Half running_arch_code=EM_ARM; 1413 #elif (defined S390) 1414 static Elf32_Half running_arch_code=EM_S390; 1415 #elif (defined ALPHA) 1416 static Elf32_Half running_arch_code=EM_ALPHA; 1417 #elif (defined MIPSEL) 1418 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1419 #elif (defined PARISC) 1420 static Elf32_Half running_arch_code=EM_PARISC; 1421 #elif (defined MIPS) 1422 static Elf32_Half running_arch_code=EM_MIPS; 1423 #elif (defined M68K) 1424 static Elf32_Half running_arch_code=EM_68K; 1425 #else 1426 #error Method os::dll_load requires that one of following is defined:\ 1427 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1428 #endif 1429 1430 // Identify compatability class for VM's architecture and library's architecture 1431 // Obtain string descriptions for architectures 1432 1433 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1434 int running_arch_index=-1; 1435 1436 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1437 if (running_arch_code == arch_array[i].code) { 1438 running_arch_index = i; 1439 } 1440 if (lib_arch.code == arch_array[i].code) { 1441 lib_arch.compat_class = arch_array[i].compat_class; 1442 lib_arch.name = arch_array[i].name; 1443 } 1444 } 1445 1446 assert(running_arch_index != -1, 1447 "Didn't find running architecture code (running_arch_code) in arch_array"); 1448 if (running_arch_index == -1) { 1449 // Even though running architecture detection failed 1450 // we may still continue with reporting dlerror() message 1451 return NULL; 1452 } 1453 1454 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1455 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1456 return NULL; 1457 } 1458 1459 #ifndef S390 1460 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1461 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1462 return NULL; 1463 } 1464 #endif // !S390 1465 1466 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1467 if (lib_arch.name!=NULL) { 1468 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1469 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1470 lib_arch.name, arch_array[running_arch_index].name); 1471 } else { 1472 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1473 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1474 lib_arch.code, 1475 arch_array[running_arch_index].name); 1476 } 1477 } 1478 1479 return NULL; 1480 #endif // STATIC_BUILD 1481 } 1482 #endif // !__APPLE__ 1483 1484 void* os::get_default_process_handle() { 1485 #ifdef __APPLE__ 1486 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1487 // to avoid finding unexpected symbols on second (or later) 1488 // loads of a library. 1489 return (void*)::dlopen(NULL, RTLD_FIRST); 1490 #else 1491 return (void*)::dlopen(NULL, RTLD_LAZY); 1492 #endif 1493 } 1494 1495 // XXX: Do we need a lock around this as per Linux? 1496 void* os::dll_lookup(void* handle, const char* name) { 1497 return dlsym(handle, name); 1498 } 1499 1500 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1501 outputStream * out = (outputStream *) param; 1502 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name); 1503 return 0; 1504 } 1505 1506 void os::print_dll_info(outputStream *st) { 1507 st->print_cr("Dynamic libraries:"); 1508 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1509 st->print_cr("Error: Cannot print dynamic libraries."); 1510 } 1511 } 1512 1513 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1514 #ifdef RTLD_DI_LINKMAP 1515 Dl_info dli; 1516 void *handle; 1517 Link_map *map; 1518 Link_map *p; 1519 1520 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1521 dli.dli_fname == NULL) { 1522 return 1; 1523 } 1524 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1525 if (handle == NULL) { 1526 return 1; 1527 } 1528 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1529 if (map == NULL) { 1530 dlclose(handle); 1531 return 1; 1532 } 1533 1534 while (map->l_prev != NULL) 1535 map = map->l_prev; 1536 1537 while (map != NULL) { 1538 // Value for top_address is returned as 0 since we don't have any information about module size 1539 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1540 dlclose(handle); 1541 return 1; 1542 } 1543 map = map->l_next; 1544 } 1545 1546 dlclose(handle); 1547 #elif defined(__APPLE__) 1548 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1549 // Value for top_address is returned as 0 since we don't have any information about module size 1550 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1551 return 1; 1552 } 1553 } 1554 return 0; 1555 #else 1556 return 1; 1557 #endif 1558 } 1559 1560 void os::get_summary_os_info(char* buf, size_t buflen) { 1561 // These buffers are small because we want this to be brief 1562 // and not use a lot of stack while generating the hs_err file. 1563 char os[100]; 1564 size_t size = sizeof(os); 1565 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1566 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1567 #ifdef __APPLE__ 1568 strncpy(os, "Darwin", sizeof(os)); 1569 #elif __OpenBSD__ 1570 strncpy(os, "OpenBSD", sizeof(os)); 1571 #else 1572 strncpy(os, "BSD", sizeof(os)); 1573 #endif 1574 } 1575 1576 char release[100]; 1577 size = sizeof(release); 1578 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1579 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1580 // if error, leave blank 1581 strncpy(release, "", sizeof(release)); 1582 } 1583 snprintf(buf, buflen, "%s %s", os, release); 1584 } 1585 1586 void os::print_os_info_brief(outputStream* st) { 1587 os::Posix::print_uname_info(st); 1588 } 1589 1590 void os::print_os_info(outputStream* st) { 1591 st->print("OS:"); 1592 1593 os::Posix::print_uname_info(st); 1594 1595 os::Posix::print_rlimit_info(st); 1596 1597 os::Posix::print_load_average(st); 1598 } 1599 1600 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1601 // Nothing to do for now. 1602 } 1603 1604 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1605 unsigned int mhz; 1606 size_t size = sizeof(mhz); 1607 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1608 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1609 mhz = 1; // looks like an error but can be divided by 1610 } else { 1611 mhz /= 1000000; // reported in millions 1612 } 1613 1614 char model[100]; 1615 size = sizeof(model); 1616 int mib_model[] = { CTL_HW, HW_MODEL }; 1617 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1618 strncpy(model, cpu_arch, sizeof(model)); 1619 } 1620 1621 char machine[100]; 1622 size = sizeof(machine); 1623 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1624 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1625 strncpy(machine, "", sizeof(machine)); 1626 } 1627 1628 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1629 } 1630 1631 void os::print_memory_info(outputStream* st) { 1632 1633 st->print("Memory:"); 1634 st->print(" %dk page", os::vm_page_size()>>10); 1635 1636 st->print(", physical " UINT64_FORMAT "k", 1637 os::physical_memory() >> 10); 1638 st->print("(" UINT64_FORMAT "k free)", 1639 os::available_memory() >> 10); 1640 st->cr(); 1641 } 1642 1643 static void print_signal_handler(outputStream* st, int sig, 1644 char* buf, size_t buflen); 1645 1646 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1647 st->print_cr("Signal Handlers:"); 1648 print_signal_handler(st, SIGSEGV, buf, buflen); 1649 print_signal_handler(st, SIGBUS , buf, buflen); 1650 print_signal_handler(st, SIGFPE , buf, buflen); 1651 print_signal_handler(st, SIGPIPE, buf, buflen); 1652 print_signal_handler(st, SIGXFSZ, buf, buflen); 1653 print_signal_handler(st, SIGILL , buf, buflen); 1654 print_signal_handler(st, SR_signum, buf, buflen); 1655 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1656 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1657 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1658 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1659 } 1660 1661 static char saved_jvm_path[MAXPATHLEN] = {0}; 1662 1663 // Find the full path to the current module, libjvm 1664 void os::jvm_path(char *buf, jint buflen) { 1665 // Error checking. 1666 if (buflen < MAXPATHLEN) { 1667 assert(false, "must use a large-enough buffer"); 1668 buf[0] = '\0'; 1669 return; 1670 } 1671 // Lazy resolve the path to current module. 1672 if (saved_jvm_path[0] != 0) { 1673 strcpy(buf, saved_jvm_path); 1674 return; 1675 } 1676 1677 char dli_fname[MAXPATHLEN]; 1678 bool ret = dll_address_to_library_name( 1679 CAST_FROM_FN_PTR(address, os::jvm_path), 1680 dli_fname, sizeof(dli_fname), NULL); 1681 assert(ret, "cannot locate libjvm"); 1682 char *rp = NULL; 1683 if (ret && dli_fname[0] != '\0') { 1684 rp = os::Posix::realpath(dli_fname, buf, buflen); 1685 } 1686 if (rp == NULL) { 1687 return; 1688 } 1689 1690 if (Arguments::sun_java_launcher_is_altjvm()) { 1691 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1692 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1693 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1694 // appears at the right place in the string, then assume we are 1695 // installed in a JDK and we're done. Otherwise, check for a 1696 // JAVA_HOME environment variable and construct a path to the JVM 1697 // being overridden. 1698 1699 const char *p = buf + strlen(buf) - 1; 1700 for (int count = 0; p > buf && count < 5; ++count) { 1701 for (--p; p > buf && *p != '/'; --p) 1702 /* empty */ ; 1703 } 1704 1705 if (strncmp(p, "/jre/lib/", 9) != 0) { 1706 // Look for JAVA_HOME in the environment. 1707 char* java_home_var = ::getenv("JAVA_HOME"); 1708 if (java_home_var != NULL && java_home_var[0] != 0) { 1709 char* jrelib_p; 1710 int len; 1711 1712 // Check the current module name "libjvm" 1713 p = strrchr(buf, '/'); 1714 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1715 1716 rp = os::Posix::realpath(java_home_var, buf, buflen); 1717 if (rp == NULL) { 1718 return; 1719 } 1720 1721 // determine if this is a legacy image or modules image 1722 // modules image doesn't have "jre" subdirectory 1723 len = strlen(buf); 1724 assert(len < buflen, "Ran out of buffer space"); 1725 jrelib_p = buf + len; 1726 1727 // Add the appropriate library subdir 1728 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1729 if (0 != access(buf, F_OK)) { 1730 snprintf(jrelib_p, buflen-len, "/lib"); 1731 } 1732 1733 // Add the appropriate client or server subdir 1734 len = strlen(buf); 1735 jrelib_p = buf + len; 1736 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1737 if (0 != access(buf, F_OK)) { 1738 snprintf(jrelib_p, buflen-len, "%s", ""); 1739 } 1740 1741 // If the path exists within JAVA_HOME, add the JVM library name 1742 // to complete the path to JVM being overridden. Otherwise fallback 1743 // to the path to the current library. 1744 if (0 == access(buf, F_OK)) { 1745 // Use current module name "libjvm" 1746 len = strlen(buf); 1747 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1748 } else { 1749 // Fall back to path of current library 1750 rp = os::Posix::realpath(dli_fname, buf, buflen); 1751 if (rp == NULL) { 1752 return; 1753 } 1754 } 1755 } 1756 } 1757 } 1758 1759 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1760 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1761 } 1762 1763 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1764 // no prefix required, not even "_" 1765 } 1766 1767 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1768 // no suffix required 1769 } 1770 1771 //////////////////////////////////////////////////////////////////////////////// 1772 // sun.misc.Signal support 1773 1774 static volatile jint sigint_count = 0; 1775 1776 static void UserHandler(int sig, void *siginfo, void *context) { 1777 // 4511530 - sem_post is serialized and handled by the manager thread. When 1778 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1779 // don't want to flood the manager thread with sem_post requests. 1780 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1781 return; 1782 } 1783 1784 // Ctrl-C is pressed during error reporting, likely because the error 1785 // handler fails to abort. Let VM die immediately. 1786 if (sig == SIGINT && VMError::is_error_reported()) { 1787 os::die(); 1788 } 1789 1790 os::signal_notify(sig); 1791 } 1792 1793 void* os::user_handler() { 1794 return CAST_FROM_FN_PTR(void*, UserHandler); 1795 } 1796 1797 extern "C" { 1798 typedef void (*sa_handler_t)(int); 1799 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1800 } 1801 1802 void* os::signal(int signal_number, void* handler) { 1803 struct sigaction sigAct, oldSigAct; 1804 1805 sigfillset(&(sigAct.sa_mask)); 1806 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1807 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1808 1809 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1810 // -1 means registration failed 1811 return (void *)-1; 1812 } 1813 1814 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1815 } 1816 1817 void os::signal_raise(int signal_number) { 1818 ::raise(signal_number); 1819 } 1820 1821 // The following code is moved from os.cpp for making this 1822 // code platform specific, which it is by its very nature. 1823 1824 // Will be modified when max signal is changed to be dynamic 1825 int os::sigexitnum_pd() { 1826 return NSIG; 1827 } 1828 1829 // a counter for each possible signal value 1830 static volatile jint pending_signals[NSIG+1] = { 0 }; 1831 static Semaphore* sig_sem = NULL; 1832 1833 void os::signal_init_pd() { 1834 // Initialize signal structures 1835 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1836 1837 // Initialize signal semaphore 1838 sig_sem = new Semaphore(); 1839 } 1840 1841 void os::signal_notify(int sig) { 1842 if (sig_sem != NULL) { 1843 Atomic::inc(&pending_signals[sig]); 1844 sig_sem->signal(); 1845 } else { 1846 // Signal thread is not created with ReduceSignalUsage and signal_init_pd 1847 // initialization isn't called. 1848 assert(ReduceSignalUsage, "signal semaphore should be created"); 1849 } 1850 } 1851 1852 static int check_pending_signals(bool wait) { 1853 Atomic::store(0, &sigint_count); 1854 for (;;) { 1855 for (int i = 0; i < NSIG + 1; i++) { 1856 jint n = pending_signals[i]; 1857 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1858 return i; 1859 } 1860 } 1861 if (!wait) { 1862 return -1; 1863 } 1864 JavaThread *thread = JavaThread::current(); 1865 ThreadBlockInVM tbivm(thread); 1866 1867 bool threadIsSuspended; 1868 do { 1869 thread->set_suspend_equivalent(); 1870 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1871 sig_sem->wait(); 1872 1873 // were we externally suspended while we were waiting? 1874 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1875 if (threadIsSuspended) { 1876 // The semaphore has been incremented, but while we were waiting 1877 // another thread suspended us. We don't want to continue running 1878 // while suspended because that would surprise the thread that 1879 // suspended us. 1880 sig_sem->signal(); 1881 1882 thread->java_suspend_self(); 1883 } 1884 } while (threadIsSuspended); 1885 } 1886 } 1887 1888 int os::signal_wait() { 1889 return check_pending_signals(true); 1890 } 1891 1892 //////////////////////////////////////////////////////////////////////////////// 1893 // Virtual Memory 1894 1895 int os::vm_page_size() { 1896 // Seems redundant as all get out 1897 assert(os::Bsd::page_size() != -1, "must call os::init"); 1898 return os::Bsd::page_size(); 1899 } 1900 1901 // Solaris allocates memory by pages. 1902 int os::vm_allocation_granularity() { 1903 assert(os::Bsd::page_size() != -1, "must call os::init"); 1904 return os::Bsd::page_size(); 1905 } 1906 1907 // Rationale behind this function: 1908 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1909 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1910 // samples for JITted code. Here we create private executable mapping over the code cache 1911 // and then we can use standard (well, almost, as mapping can change) way to provide 1912 // info for the reporting script by storing timestamp and location of symbol 1913 void bsd_wrap_code(char* base, size_t size) { 1914 static volatile jint cnt = 0; 1915 1916 if (!UseOprofile) { 1917 return; 1918 } 1919 1920 char buf[PATH_MAX + 1]; 1921 int num = Atomic::add(1, &cnt); 1922 1923 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1924 os::get_temp_directory(), os::current_process_id(), num); 1925 unlink(buf); 1926 1927 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1928 1929 if (fd != -1) { 1930 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1931 if (rv != (off_t)-1) { 1932 if (::write(fd, "", 1) == 1) { 1933 mmap(base, size, 1934 PROT_READ|PROT_WRITE|PROT_EXEC, 1935 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1936 } 1937 } 1938 ::close(fd); 1939 unlink(buf); 1940 } 1941 } 1942 1943 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 1944 int err) { 1945 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT 1946 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec, 1947 os::errno_name(err), err); 1948 } 1949 1950 // NOTE: Bsd kernel does not really reserve the pages for us. 1951 // All it does is to check if there are enough free pages 1952 // left at the time of mmap(). This could be a potential 1953 // problem. 1954 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1955 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 1956 #ifdef __OpenBSD__ 1957 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 1958 if (::mprotect(addr, size, prot) == 0) { 1959 return true; 1960 } 1961 #else 1962 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 1963 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 1964 if (res != (uintptr_t) MAP_FAILED) { 1965 return true; 1966 } 1967 #endif 1968 1969 // Warn about any commit errors we see in non-product builds just 1970 // in case mmap() doesn't work as described on the man page. 1971 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 1972 1973 return false; 1974 } 1975 1976 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 1977 bool exec) { 1978 // alignment_hint is ignored on this OS 1979 return pd_commit_memory(addr, size, exec); 1980 } 1981 1982 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 1983 const char* mesg) { 1984 assert(mesg != NULL, "mesg must be specified"); 1985 if (!pd_commit_memory(addr, size, exec)) { 1986 // add extra info in product mode for vm_exit_out_of_memory(): 1987 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 1988 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 1989 } 1990 } 1991 1992 void os::pd_commit_memory_or_exit(char* addr, size_t size, 1993 size_t alignment_hint, bool exec, 1994 const char* mesg) { 1995 // alignment_hint is ignored on this OS 1996 pd_commit_memory_or_exit(addr, size, exec, mesg); 1997 } 1998 1999 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2000 } 2001 2002 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2003 ::madvise(addr, bytes, MADV_DONTNEED); 2004 } 2005 2006 void os::numa_make_global(char *addr, size_t bytes) { 2007 } 2008 2009 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2010 } 2011 2012 bool os::numa_topology_changed() { return false; } 2013 2014 size_t os::numa_get_groups_num() { 2015 return 1; 2016 } 2017 2018 int os::numa_get_group_id() { 2019 return 0; 2020 } 2021 2022 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2023 if (size > 0) { 2024 ids[0] = 0; 2025 return 1; 2026 } 2027 return 0; 2028 } 2029 2030 bool os::get_page_info(char *start, page_info* info) { 2031 return false; 2032 } 2033 2034 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2035 return end; 2036 } 2037 2038 2039 bool os::pd_uncommit_memory(char* addr, size_t size) { 2040 #ifdef __OpenBSD__ 2041 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2042 return ::mprotect(addr, size, PROT_NONE) == 0; 2043 #else 2044 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2045 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2046 return res != (uintptr_t) MAP_FAILED; 2047 #endif 2048 } 2049 2050 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2051 return os::commit_memory(addr, size, !ExecMem); 2052 } 2053 2054 // If this is a growable mapping, remove the guard pages entirely by 2055 // munmap()ping them. If not, just call uncommit_memory(). 2056 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2057 return os::uncommit_memory(addr, size); 2058 } 2059 2060 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2061 // at 'requested_addr'. If there are existing memory mappings at the same 2062 // location, however, they will be overwritten. If 'fixed' is false, 2063 // 'requested_addr' is only treated as a hint, the return value may or 2064 // may not start from the requested address. Unlike Bsd mmap(), this 2065 // function returns NULL to indicate failure. 2066 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2067 char * addr; 2068 int flags; 2069 2070 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2071 if (fixed) { 2072 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2073 flags |= MAP_FIXED; 2074 } 2075 2076 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2077 // touch an uncommitted page. Otherwise, the read/write might 2078 // succeed if we have enough swap space to back the physical page. 2079 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2080 flags, -1, 0); 2081 2082 return addr == MAP_FAILED ? NULL : addr; 2083 } 2084 2085 static int anon_munmap(char * addr, size_t size) { 2086 return ::munmap(addr, size) == 0; 2087 } 2088 2089 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2090 size_t alignment_hint) { 2091 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2092 } 2093 2094 bool os::pd_release_memory(char* addr, size_t size) { 2095 return anon_munmap(addr, size); 2096 } 2097 2098 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2099 // Bsd wants the mprotect address argument to be page aligned. 2100 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size()); 2101 2102 // According to SUSv3, mprotect() should only be used with mappings 2103 // established by mmap(), and mmap() always maps whole pages. Unaligned 2104 // 'addr' likely indicates problem in the VM (e.g. trying to change 2105 // protection of malloc'ed or statically allocated memory). Check the 2106 // caller if you hit this assert. 2107 assert(addr == bottom, "sanity check"); 2108 2109 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2110 return ::mprotect(bottom, size, prot) == 0; 2111 } 2112 2113 // Set protections specified 2114 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2115 bool is_committed) { 2116 unsigned int p = 0; 2117 switch (prot) { 2118 case MEM_PROT_NONE: p = PROT_NONE; break; 2119 case MEM_PROT_READ: p = PROT_READ; break; 2120 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2121 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2122 default: 2123 ShouldNotReachHere(); 2124 } 2125 // is_committed is unused. 2126 return bsd_mprotect(addr, bytes, p); 2127 } 2128 2129 bool os::guard_memory(char* addr, size_t size) { 2130 return bsd_mprotect(addr, size, PROT_NONE); 2131 } 2132 2133 bool os::unguard_memory(char* addr, size_t size) { 2134 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2135 } 2136 2137 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2138 return false; 2139 } 2140 2141 // Large page support 2142 2143 static size_t _large_page_size = 0; 2144 2145 void os::large_page_init() { 2146 } 2147 2148 2149 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2150 fatal("This code is not used or maintained."); 2151 2152 // "exec" is passed in but not used. Creating the shared image for 2153 // the code cache doesn't have an SHM_X executable permission to check. 2154 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2155 2156 key_t key = IPC_PRIVATE; 2157 char *addr; 2158 2159 bool warn_on_failure = UseLargePages && 2160 (!FLAG_IS_DEFAULT(UseLargePages) || 2161 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2162 2163 // Create a large shared memory region to attach to based on size. 2164 // Currently, size is the total size of the heap 2165 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2166 if (shmid == -1) { 2167 // Possible reasons for shmget failure: 2168 // 1. shmmax is too small for Java heap. 2169 // > check shmmax value: cat /proc/sys/kernel/shmmax 2170 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2171 // 2. not enough large page memory. 2172 // > check available large pages: cat /proc/meminfo 2173 // > increase amount of large pages: 2174 // echo new_value > /proc/sys/vm/nr_hugepages 2175 // Note 1: different Bsd may use different name for this property, 2176 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2177 // Note 2: it's possible there's enough physical memory available but 2178 // they are so fragmented after a long run that they can't 2179 // coalesce into large pages. Try to reserve large pages when 2180 // the system is still "fresh". 2181 if (warn_on_failure) { 2182 warning("Failed to reserve shared memory (errno = %d).", errno); 2183 } 2184 return NULL; 2185 } 2186 2187 // attach to the region 2188 addr = (char*)shmat(shmid, req_addr, 0); 2189 int err = errno; 2190 2191 // Remove shmid. If shmat() is successful, the actual shared memory segment 2192 // will be deleted when it's detached by shmdt() or when the process 2193 // terminates. If shmat() is not successful this will remove the shared 2194 // segment immediately. 2195 shmctl(shmid, IPC_RMID, NULL); 2196 2197 if ((intptr_t)addr == -1) { 2198 if (warn_on_failure) { 2199 warning("Failed to attach shared memory (errno = %d).", err); 2200 } 2201 return NULL; 2202 } 2203 2204 // The memory is committed 2205 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2206 2207 return addr; 2208 } 2209 2210 bool os::release_memory_special(char* base, size_t bytes) { 2211 if (MemTracker::tracking_level() > NMT_minimal) { 2212 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2213 // detaching the SHM segment will also delete it, see reserve_memory_special() 2214 int rslt = shmdt(base); 2215 if (rslt == 0) { 2216 tkr.record((address)base, bytes); 2217 return true; 2218 } else { 2219 return false; 2220 } 2221 } else { 2222 return shmdt(base) == 0; 2223 } 2224 } 2225 2226 size_t os::large_page_size() { 2227 return _large_page_size; 2228 } 2229 2230 // HugeTLBFS allows application to commit large page memory on demand; 2231 // with SysV SHM the entire memory region must be allocated as shared 2232 // memory. 2233 bool os::can_commit_large_page_memory() { 2234 return UseHugeTLBFS; 2235 } 2236 2237 bool os::can_execute_large_page_memory() { 2238 return UseHugeTLBFS; 2239 } 2240 2241 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2242 assert(file_desc >= 0, "file_desc is not valid"); 2243 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2244 if (result != NULL) { 2245 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2246 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2247 } 2248 } 2249 return result; 2250 } 2251 2252 // Reserve memory at an arbitrary address, only if that area is 2253 // available (and not reserved for something else). 2254 2255 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2256 const int max_tries = 10; 2257 char* base[max_tries]; 2258 size_t size[max_tries]; 2259 const size_t gap = 0x000000; 2260 2261 // Assert only that the size is a multiple of the page size, since 2262 // that's all that mmap requires, and since that's all we really know 2263 // about at this low abstraction level. If we need higher alignment, 2264 // we can either pass an alignment to this method or verify alignment 2265 // in one of the methods further up the call chain. See bug 5044738. 2266 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2267 2268 // Repeatedly allocate blocks until the block is allocated at the 2269 // right spot. 2270 2271 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2272 // if kernel honors the hint then we can return immediately. 2273 char * addr = anon_mmap(requested_addr, bytes, false); 2274 if (addr == requested_addr) { 2275 return requested_addr; 2276 } 2277 2278 if (addr != NULL) { 2279 // mmap() is successful but it fails to reserve at the requested address 2280 anon_munmap(addr, bytes); 2281 } 2282 2283 int i; 2284 for (i = 0; i < max_tries; ++i) { 2285 base[i] = reserve_memory(bytes); 2286 2287 if (base[i] != NULL) { 2288 // Is this the block we wanted? 2289 if (base[i] == requested_addr) { 2290 size[i] = bytes; 2291 break; 2292 } 2293 2294 // Does this overlap the block we wanted? Give back the overlapped 2295 // parts and try again. 2296 2297 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2298 if (top_overlap >= 0 && top_overlap < bytes) { 2299 unmap_memory(base[i], top_overlap); 2300 base[i] += top_overlap; 2301 size[i] = bytes - top_overlap; 2302 } else { 2303 size_t bottom_overlap = base[i] + bytes - requested_addr; 2304 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2305 unmap_memory(requested_addr, bottom_overlap); 2306 size[i] = bytes - bottom_overlap; 2307 } else { 2308 size[i] = bytes; 2309 } 2310 } 2311 } 2312 } 2313 2314 // Give back the unused reserved pieces. 2315 2316 for (int j = 0; j < i; ++j) { 2317 if (base[j] != NULL) { 2318 unmap_memory(base[j], size[j]); 2319 } 2320 } 2321 2322 if (i < max_tries) { 2323 return requested_addr; 2324 } else { 2325 return NULL; 2326 } 2327 } 2328 2329 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2330 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2331 } 2332 2333 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2334 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2335 } 2336 2337 void os::naked_short_sleep(jlong ms) { 2338 struct timespec req; 2339 2340 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2341 req.tv_sec = 0; 2342 if (ms > 0) { 2343 req.tv_nsec = (ms % 1000) * 1000000; 2344 } else { 2345 req.tv_nsec = 1; 2346 } 2347 2348 nanosleep(&req, NULL); 2349 2350 return; 2351 } 2352 2353 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2354 void os::infinite_sleep() { 2355 while (true) { // sleep forever ... 2356 ::sleep(100); // ... 100 seconds at a time 2357 } 2358 } 2359 2360 // Used to convert frequent JVM_Yield() to nops 2361 bool os::dont_yield() { 2362 return DontYieldALot; 2363 } 2364 2365 void os::naked_yield() { 2366 sched_yield(); 2367 } 2368 2369 //////////////////////////////////////////////////////////////////////////////// 2370 // thread priority support 2371 2372 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2373 // only supports dynamic priority, static priority must be zero. For real-time 2374 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2375 // However, for large multi-threaded applications, SCHED_RR is not only slower 2376 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2377 // of 5 runs - Sep 2005). 2378 // 2379 // The following code actually changes the niceness of kernel-thread/LWP. It 2380 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2381 // not the entire user process, and user level threads are 1:1 mapped to kernel 2382 // threads. It has always been the case, but could change in the future. For 2383 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2384 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2385 2386 #if !defined(__APPLE__) 2387 int os::java_to_os_priority[CriticalPriority + 1] = { 2388 19, // 0 Entry should never be used 2389 2390 0, // 1 MinPriority 2391 3, // 2 2392 6, // 3 2393 2394 10, // 4 2395 15, // 5 NormPriority 2396 18, // 6 2397 2398 21, // 7 2399 25, // 8 2400 28, // 9 NearMaxPriority 2401 2402 31, // 10 MaxPriority 2403 2404 31 // 11 CriticalPriority 2405 }; 2406 #else 2407 // Using Mach high-level priority assignments 2408 int os::java_to_os_priority[CriticalPriority + 1] = { 2409 0, // 0 Entry should never be used (MINPRI_USER) 2410 2411 27, // 1 MinPriority 2412 28, // 2 2413 29, // 3 2414 2415 30, // 4 2416 31, // 5 NormPriority (BASEPRI_DEFAULT) 2417 32, // 6 2418 2419 33, // 7 2420 34, // 8 2421 35, // 9 NearMaxPriority 2422 2423 36, // 10 MaxPriority 2424 2425 36 // 11 CriticalPriority 2426 }; 2427 #endif 2428 2429 static int prio_init() { 2430 if (ThreadPriorityPolicy == 1) { 2431 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2432 // if effective uid is not root. Perhaps, a more elegant way of doing 2433 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2434 if (geteuid() != 0) { 2435 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2436 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2437 } 2438 ThreadPriorityPolicy = 0; 2439 } 2440 } 2441 if (UseCriticalJavaThreadPriority) { 2442 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2443 } 2444 return 0; 2445 } 2446 2447 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2448 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2449 2450 #ifdef __OpenBSD__ 2451 // OpenBSD pthread_setprio starves low priority threads 2452 return OS_OK; 2453 #elif defined(__FreeBSD__) 2454 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2455 #elif defined(__APPLE__) || defined(__NetBSD__) 2456 struct sched_param sp; 2457 int policy; 2458 pthread_t self = pthread_self(); 2459 2460 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2461 return OS_ERR; 2462 } 2463 2464 sp.sched_priority = newpri; 2465 if (pthread_setschedparam(self, policy, &sp) != 0) { 2466 return OS_ERR; 2467 } 2468 2469 return OS_OK; 2470 #else 2471 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2472 return (ret == 0) ? OS_OK : OS_ERR; 2473 #endif 2474 } 2475 2476 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2477 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2478 *priority_ptr = java_to_os_priority[NormPriority]; 2479 return OS_OK; 2480 } 2481 2482 errno = 0; 2483 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2484 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2485 #elif defined(__APPLE__) || defined(__NetBSD__) 2486 int policy; 2487 struct sched_param sp; 2488 2489 pthread_getschedparam(pthread_self(), &policy, &sp); 2490 *priority_ptr = sp.sched_priority; 2491 #else 2492 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2493 #endif 2494 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2495 } 2496 2497 // Hint to the underlying OS that a task switch would not be good. 2498 // Void return because it's a hint and can fail. 2499 void os::hint_no_preempt() {} 2500 2501 //////////////////////////////////////////////////////////////////////////////// 2502 // suspend/resume support 2503 2504 // The low-level signal-based suspend/resume support is a remnant from the 2505 // old VM-suspension that used to be for java-suspension, safepoints etc, 2506 // within hotspot. Currently used by JFR's OSThreadSampler 2507 // 2508 // The remaining code is greatly simplified from the more general suspension 2509 // code that used to be used. 2510 // 2511 // The protocol is quite simple: 2512 // - suspend: 2513 // - sends a signal to the target thread 2514 // - polls the suspend state of the osthread using a yield loop 2515 // - target thread signal handler (SR_handler) sets suspend state 2516 // and blocks in sigsuspend until continued 2517 // - resume: 2518 // - sets target osthread state to continue 2519 // - sends signal to end the sigsuspend loop in the SR_handler 2520 // 2521 // Note that the SR_lock plays no role in this suspend/resume protocol, 2522 // but is checked for NULL in SR_handler as a thread termination indicator. 2523 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2524 // 2525 // Note that resume_clear_context() and suspend_save_context() are needed 2526 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2527 // which in part is used by: 2528 // - Forte Analyzer: AsyncGetCallTrace() 2529 // - StackBanging: get_frame_at_stack_banging_point() 2530 2531 static void resume_clear_context(OSThread *osthread) { 2532 osthread->set_ucontext(NULL); 2533 osthread->set_siginfo(NULL); 2534 } 2535 2536 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2537 osthread->set_ucontext(context); 2538 osthread->set_siginfo(siginfo); 2539 } 2540 2541 // Handler function invoked when a thread's execution is suspended or 2542 // resumed. We have to be careful that only async-safe functions are 2543 // called here (Note: most pthread functions are not async safe and 2544 // should be avoided.) 2545 // 2546 // Note: sigwait() is a more natural fit than sigsuspend() from an 2547 // interface point of view, but sigwait() prevents the signal hander 2548 // from being run. libpthread would get very confused by not having 2549 // its signal handlers run and prevents sigwait()'s use with the 2550 // mutex granting granting signal. 2551 // 2552 // Currently only ever called on the VMThread or JavaThread 2553 // 2554 #ifdef __APPLE__ 2555 static OSXSemaphore sr_semaphore; 2556 #else 2557 static PosixSemaphore sr_semaphore; 2558 #endif 2559 2560 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2561 // Save and restore errno to avoid confusing native code with EINTR 2562 // after sigsuspend. 2563 int old_errno = errno; 2564 2565 Thread* thread = Thread::current_or_null_safe(); 2566 assert(thread != NULL, "Missing current thread in SR_handler"); 2567 2568 // On some systems we have seen signal delivery get "stuck" until the signal 2569 // mask is changed as part of thread termination. Check that the current thread 2570 // has not already terminated (via SR_lock()) - else the following assertion 2571 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2572 // destructor has completed. 2573 2574 if (thread->SR_lock() == NULL) { 2575 return; 2576 } 2577 2578 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2579 2580 OSThread* osthread = thread->osthread(); 2581 2582 os::SuspendResume::State current = osthread->sr.state(); 2583 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2584 suspend_save_context(osthread, siginfo, context); 2585 2586 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2587 os::SuspendResume::State state = osthread->sr.suspended(); 2588 if (state == os::SuspendResume::SR_SUSPENDED) { 2589 sigset_t suspend_set; // signals for sigsuspend() 2590 2591 // get current set of blocked signals and unblock resume signal 2592 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2593 sigdelset(&suspend_set, SR_signum); 2594 2595 sr_semaphore.signal(); 2596 // wait here until we are resumed 2597 while (1) { 2598 sigsuspend(&suspend_set); 2599 2600 os::SuspendResume::State result = osthread->sr.running(); 2601 if (result == os::SuspendResume::SR_RUNNING) { 2602 sr_semaphore.signal(); 2603 break; 2604 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2605 ShouldNotReachHere(); 2606 } 2607 } 2608 2609 } else if (state == os::SuspendResume::SR_RUNNING) { 2610 // request was cancelled, continue 2611 } else { 2612 ShouldNotReachHere(); 2613 } 2614 2615 resume_clear_context(osthread); 2616 } else if (current == os::SuspendResume::SR_RUNNING) { 2617 // request was cancelled, continue 2618 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2619 // ignore 2620 } else { 2621 // ignore 2622 } 2623 2624 errno = old_errno; 2625 } 2626 2627 2628 static int SR_initialize() { 2629 struct sigaction act; 2630 char *s; 2631 // Get signal number to use for suspend/resume 2632 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2633 int sig = ::strtol(s, 0, 10); 2634 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2635 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2636 SR_signum = sig; 2637 } else { 2638 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2639 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2640 } 2641 } 2642 2643 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2644 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2645 2646 sigemptyset(&SR_sigset); 2647 sigaddset(&SR_sigset, SR_signum); 2648 2649 // Set up signal handler for suspend/resume 2650 act.sa_flags = SA_RESTART|SA_SIGINFO; 2651 act.sa_handler = (void (*)(int)) SR_handler; 2652 2653 // SR_signum is blocked by default. 2654 // 4528190 - We also need to block pthread restart signal (32 on all 2655 // supported Bsd platforms). Note that BsdThreads need to block 2656 // this signal for all threads to work properly. So we don't have 2657 // to use hard-coded signal number when setting up the mask. 2658 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2659 2660 if (sigaction(SR_signum, &act, 0) == -1) { 2661 return -1; 2662 } 2663 2664 // Save signal flag 2665 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2666 return 0; 2667 } 2668 2669 static int sr_notify(OSThread* osthread) { 2670 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2671 assert_status(status == 0, status, "pthread_kill"); 2672 return status; 2673 } 2674 2675 // "Randomly" selected value for how long we want to spin 2676 // before bailing out on suspending a thread, also how often 2677 // we send a signal to a thread we want to resume 2678 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2679 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2680 2681 // returns true on success and false on error - really an error is fatal 2682 // but this seems the normal response to library errors 2683 static bool do_suspend(OSThread* osthread) { 2684 assert(osthread->sr.is_running(), "thread should be running"); 2685 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2686 2687 // mark as suspended and send signal 2688 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2689 // failed to switch, state wasn't running? 2690 ShouldNotReachHere(); 2691 return false; 2692 } 2693 2694 if (sr_notify(osthread) != 0) { 2695 ShouldNotReachHere(); 2696 } 2697 2698 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2699 while (true) { 2700 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2701 break; 2702 } else { 2703 // timeout 2704 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2705 if (cancelled == os::SuspendResume::SR_RUNNING) { 2706 return false; 2707 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2708 // make sure that we consume the signal on the semaphore as well 2709 sr_semaphore.wait(); 2710 break; 2711 } else { 2712 ShouldNotReachHere(); 2713 return false; 2714 } 2715 } 2716 } 2717 2718 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2719 return true; 2720 } 2721 2722 static void do_resume(OSThread* osthread) { 2723 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2724 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2725 2726 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2727 // failed to switch to WAKEUP_REQUEST 2728 ShouldNotReachHere(); 2729 return; 2730 } 2731 2732 while (true) { 2733 if (sr_notify(osthread) == 0) { 2734 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2735 if (osthread->sr.is_running()) { 2736 return; 2737 } 2738 } 2739 } else { 2740 ShouldNotReachHere(); 2741 } 2742 } 2743 2744 guarantee(osthread->sr.is_running(), "Must be running!"); 2745 } 2746 2747 /////////////////////////////////////////////////////////////////////////////////// 2748 // signal handling (except suspend/resume) 2749 2750 // This routine may be used by user applications as a "hook" to catch signals. 2751 // The user-defined signal handler must pass unrecognized signals to this 2752 // routine, and if it returns true (non-zero), then the signal handler must 2753 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2754 // routine will never retun false (zero), but instead will execute a VM panic 2755 // routine kill the process. 2756 // 2757 // If this routine returns false, it is OK to call it again. This allows 2758 // the user-defined signal handler to perform checks either before or after 2759 // the VM performs its own checks. Naturally, the user code would be making 2760 // a serious error if it tried to handle an exception (such as a null check 2761 // or breakpoint) that the VM was generating for its own correct operation. 2762 // 2763 // This routine may recognize any of the following kinds of signals: 2764 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2765 // It should be consulted by handlers for any of those signals. 2766 // 2767 // The caller of this routine must pass in the three arguments supplied 2768 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2769 // field of the structure passed to sigaction(). This routine assumes that 2770 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2771 // 2772 // Note that the VM will print warnings if it detects conflicting signal 2773 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2774 // 2775 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2776 void* ucontext, 2777 int abort_if_unrecognized); 2778 2779 void signalHandler(int sig, siginfo_t* info, void* uc) { 2780 assert(info != NULL && uc != NULL, "it must be old kernel"); 2781 int orig_errno = errno; // Preserve errno value over signal handler. 2782 JVM_handle_bsd_signal(sig, info, uc, true); 2783 errno = orig_errno; 2784 } 2785 2786 2787 // This boolean allows users to forward their own non-matching signals 2788 // to JVM_handle_bsd_signal, harmlessly. 2789 bool os::Bsd::signal_handlers_are_installed = false; 2790 2791 // For signal-chaining 2792 struct sigaction sigact[NSIG]; 2793 uint32_t sigs = 0; 2794 #if (32 < NSIG-1) 2795 #error "Not all signals can be encoded in sigs. Adapt its type!" 2796 #endif 2797 bool os::Bsd::libjsig_is_loaded = false; 2798 typedef struct sigaction *(*get_signal_t)(int); 2799 get_signal_t os::Bsd::get_signal_action = NULL; 2800 2801 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2802 struct sigaction *actp = NULL; 2803 2804 if (libjsig_is_loaded) { 2805 // Retrieve the old signal handler from libjsig 2806 actp = (*get_signal_action)(sig); 2807 } 2808 if (actp == NULL) { 2809 // Retrieve the preinstalled signal handler from jvm 2810 actp = get_preinstalled_handler(sig); 2811 } 2812 2813 return actp; 2814 } 2815 2816 static bool call_chained_handler(struct sigaction *actp, int sig, 2817 siginfo_t *siginfo, void *context) { 2818 // Call the old signal handler 2819 if (actp->sa_handler == SIG_DFL) { 2820 // It's more reasonable to let jvm treat it as an unexpected exception 2821 // instead of taking the default action. 2822 return false; 2823 } else if (actp->sa_handler != SIG_IGN) { 2824 if ((actp->sa_flags & SA_NODEFER) == 0) { 2825 // automaticlly block the signal 2826 sigaddset(&(actp->sa_mask), sig); 2827 } 2828 2829 sa_handler_t hand; 2830 sa_sigaction_t sa; 2831 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2832 // retrieve the chained handler 2833 if (siginfo_flag_set) { 2834 sa = actp->sa_sigaction; 2835 } else { 2836 hand = actp->sa_handler; 2837 } 2838 2839 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2840 actp->sa_handler = SIG_DFL; 2841 } 2842 2843 // try to honor the signal mask 2844 sigset_t oset; 2845 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2846 2847 // call into the chained handler 2848 if (siginfo_flag_set) { 2849 (*sa)(sig, siginfo, context); 2850 } else { 2851 (*hand)(sig); 2852 } 2853 2854 // restore the signal mask 2855 pthread_sigmask(SIG_SETMASK, &oset, 0); 2856 } 2857 // Tell jvm's signal handler the signal is taken care of. 2858 return true; 2859 } 2860 2861 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2862 bool chained = false; 2863 // signal-chaining 2864 if (UseSignalChaining) { 2865 struct sigaction *actp = get_chained_signal_action(sig); 2866 if (actp != NULL) { 2867 chained = call_chained_handler(actp, sig, siginfo, context); 2868 } 2869 } 2870 return chained; 2871 } 2872 2873 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2874 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 2875 return &sigact[sig]; 2876 } 2877 return NULL; 2878 } 2879 2880 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2881 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2882 sigact[sig] = oldAct; 2883 sigs |= (uint32_t)1 << (sig-1); 2884 } 2885 2886 // for diagnostic 2887 int sigflags[NSIG]; 2888 2889 int os::Bsd::get_our_sigflags(int sig) { 2890 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2891 return sigflags[sig]; 2892 } 2893 2894 void os::Bsd::set_our_sigflags(int sig, int flags) { 2895 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2896 if (sig > 0 && sig < NSIG) { 2897 sigflags[sig] = flags; 2898 } 2899 } 2900 2901 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 2902 // Check for overwrite. 2903 struct sigaction oldAct; 2904 sigaction(sig, (struct sigaction*)NULL, &oldAct); 2905 2906 void* oldhand = oldAct.sa_sigaction 2907 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2908 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2909 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 2910 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 2911 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 2912 if (AllowUserSignalHandlers || !set_installed) { 2913 // Do not overwrite; user takes responsibility to forward to us. 2914 return; 2915 } else if (UseSignalChaining) { 2916 // save the old handler in jvm 2917 save_preinstalled_handler(sig, oldAct); 2918 // libjsig also interposes the sigaction() call below and saves the 2919 // old sigaction on it own. 2920 } else { 2921 fatal("Encountered unexpected pre-existing sigaction handler " 2922 "%#lx for signal %d.", (long)oldhand, sig); 2923 } 2924 } 2925 2926 struct sigaction sigAct; 2927 sigfillset(&(sigAct.sa_mask)); 2928 sigAct.sa_handler = SIG_DFL; 2929 if (!set_installed) { 2930 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2931 } else { 2932 sigAct.sa_sigaction = signalHandler; 2933 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 2934 } 2935 #ifdef __APPLE__ 2936 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 2937 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 2938 // if the signal handler declares it will handle it on alternate stack. 2939 // Notice we only declare we will handle it on alt stack, but we are not 2940 // actually going to use real alt stack - this is just a workaround. 2941 // Please see ux_exception.c, method catch_mach_exception_raise for details 2942 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 2943 if (sig == SIGSEGV) { 2944 sigAct.sa_flags |= SA_ONSTACK; 2945 } 2946 #endif 2947 2948 // Save flags, which are set by ours 2949 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2950 sigflags[sig] = sigAct.sa_flags; 2951 2952 int ret = sigaction(sig, &sigAct, &oldAct); 2953 assert(ret == 0, "check"); 2954 2955 void* oldhand2 = oldAct.sa_sigaction 2956 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 2957 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 2958 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 2959 } 2960 2961 // install signal handlers for signals that HotSpot needs to 2962 // handle in order to support Java-level exception handling. 2963 2964 void os::Bsd::install_signal_handlers() { 2965 if (!signal_handlers_are_installed) { 2966 signal_handlers_are_installed = true; 2967 2968 // signal-chaining 2969 typedef void (*signal_setting_t)(); 2970 signal_setting_t begin_signal_setting = NULL; 2971 signal_setting_t end_signal_setting = NULL; 2972 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2973 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 2974 if (begin_signal_setting != NULL) { 2975 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 2976 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 2977 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 2978 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 2979 libjsig_is_loaded = true; 2980 assert(UseSignalChaining, "should enable signal-chaining"); 2981 } 2982 if (libjsig_is_loaded) { 2983 // Tell libjsig jvm is setting signal handlers 2984 (*begin_signal_setting)(); 2985 } 2986 2987 set_signal_handler(SIGSEGV, true); 2988 set_signal_handler(SIGPIPE, true); 2989 set_signal_handler(SIGBUS, true); 2990 set_signal_handler(SIGILL, true); 2991 set_signal_handler(SIGFPE, true); 2992 set_signal_handler(SIGXFSZ, true); 2993 2994 #if defined(__APPLE__) 2995 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 2996 // signals caught and handled by the JVM. To work around this, we reset the mach task 2997 // signal handler that's placed on our process by CrashReporter. This disables 2998 // CrashReporter-based reporting. 2999 // 3000 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3001 // on caught fatal signals. 3002 // 3003 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3004 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3005 // exception handling, while leaving the standard BSD signal handlers functional. 3006 kern_return_t kr; 3007 kr = task_set_exception_ports(mach_task_self(), 3008 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3009 MACH_PORT_NULL, 3010 EXCEPTION_STATE_IDENTITY, 3011 MACHINE_THREAD_STATE); 3012 3013 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3014 #endif 3015 3016 if (libjsig_is_loaded) { 3017 // Tell libjsig jvm finishes setting signal handlers 3018 (*end_signal_setting)(); 3019 } 3020 3021 // We don't activate signal checker if libjsig is in place, we trust ourselves 3022 // and if UserSignalHandler is installed all bets are off 3023 if (CheckJNICalls) { 3024 if (libjsig_is_loaded) { 3025 if (PrintJNIResolving) { 3026 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3027 } 3028 check_signals = false; 3029 } 3030 if (AllowUserSignalHandlers) { 3031 if (PrintJNIResolving) { 3032 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3033 } 3034 check_signals = false; 3035 } 3036 } 3037 } 3038 } 3039 3040 3041 ///// 3042 // glibc on Bsd platform uses non-documented flag 3043 // to indicate, that some special sort of signal 3044 // trampoline is used. 3045 // We will never set this flag, and we should 3046 // ignore this flag in our diagnostic 3047 #ifdef SIGNIFICANT_SIGNAL_MASK 3048 #undef SIGNIFICANT_SIGNAL_MASK 3049 #endif 3050 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3051 3052 static const char* get_signal_handler_name(address handler, 3053 char* buf, int buflen) { 3054 int offset; 3055 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3056 if (found) { 3057 // skip directory names 3058 const char *p1, *p2; 3059 p1 = buf; 3060 size_t len = strlen(os::file_separator()); 3061 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3062 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3063 } else { 3064 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3065 } 3066 return buf; 3067 } 3068 3069 static void print_signal_handler(outputStream* st, int sig, 3070 char* buf, size_t buflen) { 3071 struct sigaction sa; 3072 3073 sigaction(sig, NULL, &sa); 3074 3075 // See comment for SIGNIFICANT_SIGNAL_MASK define 3076 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3077 3078 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3079 3080 address handler = (sa.sa_flags & SA_SIGINFO) 3081 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3082 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3083 3084 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3085 st->print("SIG_DFL"); 3086 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3087 st->print("SIG_IGN"); 3088 } else { 3089 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3090 } 3091 3092 st->print(", sa_mask[0]="); 3093 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3094 3095 address rh = VMError::get_resetted_sighandler(sig); 3096 // May be, handler was resetted by VMError? 3097 if (rh != NULL) { 3098 handler = rh; 3099 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3100 } 3101 3102 st->print(", sa_flags="); 3103 os::Posix::print_sa_flags(st, sa.sa_flags); 3104 3105 // Check: is it our handler? 3106 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3107 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3108 // It is our signal handler 3109 // check for flags, reset system-used one! 3110 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3111 st->print( 3112 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3113 os::Bsd::get_our_sigflags(sig)); 3114 } 3115 } 3116 st->cr(); 3117 } 3118 3119 3120 #define DO_SIGNAL_CHECK(sig) \ 3121 do { \ 3122 if (!sigismember(&check_signal_done, sig)) { \ 3123 os::Bsd::check_signal_handler(sig); \ 3124 } \ 3125 } while (0) 3126 3127 // This method is a periodic task to check for misbehaving JNI applications 3128 // under CheckJNI, we can add any periodic checks here 3129 3130 void os::run_periodic_checks() { 3131 3132 if (check_signals == false) return; 3133 3134 // SEGV and BUS if overridden could potentially prevent 3135 // generation of hs*.log in the event of a crash, debugging 3136 // such a case can be very challenging, so we absolutely 3137 // check the following for a good measure: 3138 DO_SIGNAL_CHECK(SIGSEGV); 3139 DO_SIGNAL_CHECK(SIGILL); 3140 DO_SIGNAL_CHECK(SIGFPE); 3141 DO_SIGNAL_CHECK(SIGBUS); 3142 DO_SIGNAL_CHECK(SIGPIPE); 3143 DO_SIGNAL_CHECK(SIGXFSZ); 3144 3145 3146 // ReduceSignalUsage allows the user to override these handlers 3147 // see comments at the very top and jvm_md.h 3148 if (!ReduceSignalUsage) { 3149 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3150 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3151 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3152 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3153 } 3154 3155 DO_SIGNAL_CHECK(SR_signum); 3156 } 3157 3158 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3159 3160 static os_sigaction_t os_sigaction = NULL; 3161 3162 void os::Bsd::check_signal_handler(int sig) { 3163 char buf[O_BUFLEN]; 3164 address jvmHandler = NULL; 3165 3166 3167 struct sigaction act; 3168 if (os_sigaction == NULL) { 3169 // only trust the default sigaction, in case it has been interposed 3170 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3171 if (os_sigaction == NULL) return; 3172 } 3173 3174 os_sigaction(sig, (struct sigaction*)NULL, &act); 3175 3176 3177 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3178 3179 address thisHandler = (act.sa_flags & SA_SIGINFO) 3180 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3181 : CAST_FROM_FN_PTR(address, act.sa_handler); 3182 3183 3184 switch (sig) { 3185 case SIGSEGV: 3186 case SIGBUS: 3187 case SIGFPE: 3188 case SIGPIPE: 3189 case SIGILL: 3190 case SIGXFSZ: 3191 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3192 break; 3193 3194 case SHUTDOWN1_SIGNAL: 3195 case SHUTDOWN2_SIGNAL: 3196 case SHUTDOWN3_SIGNAL: 3197 case BREAK_SIGNAL: 3198 jvmHandler = (address)user_handler(); 3199 break; 3200 3201 default: 3202 if (sig == SR_signum) { 3203 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3204 } else { 3205 return; 3206 } 3207 break; 3208 } 3209 3210 if (thisHandler != jvmHandler) { 3211 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3212 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3213 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3214 // No need to check this sig any longer 3215 sigaddset(&check_signal_done, sig); 3216 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3217 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3218 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3219 exception_name(sig, buf, O_BUFLEN)); 3220 } 3221 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3222 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3223 tty->print("expected:"); 3224 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3225 tty->cr(); 3226 tty->print(" found:"); 3227 os::Posix::print_sa_flags(tty, act.sa_flags); 3228 tty->cr(); 3229 // No need to check this sig any longer 3230 sigaddset(&check_signal_done, sig); 3231 } 3232 3233 // Dump all the signal 3234 if (sigismember(&check_signal_done, sig)) { 3235 print_signal_handlers(tty, buf, O_BUFLEN); 3236 } 3237 } 3238 3239 extern void report_error(char* file_name, int line_no, char* title, 3240 char* format, ...); 3241 3242 // this is called _before_ the most of global arguments have been parsed 3243 void os::init(void) { 3244 char dummy; // used to get a guess on initial stack address 3245 3246 // With BsdThreads the JavaMain thread pid (primordial thread) 3247 // is different than the pid of the java launcher thread. 3248 // So, on Bsd, the launcher thread pid is passed to the VM 3249 // via the sun.java.launcher.pid property. 3250 // Use this property instead of getpid() if it was correctly passed. 3251 // See bug 6351349. 3252 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3253 3254 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3255 3256 clock_tics_per_sec = CLK_TCK; 3257 3258 init_random(1234567); 3259 3260 Bsd::set_page_size(getpagesize()); 3261 if (Bsd::page_size() == -1) { 3262 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3263 } 3264 init_page_sizes((size_t) Bsd::page_size()); 3265 3266 Bsd::initialize_system_info(); 3267 3268 // _main_thread points to the thread that created/loaded the JVM. 3269 Bsd::_main_thread = pthread_self(); 3270 3271 Bsd::clock_init(); 3272 initial_time_count = javaTimeNanos(); 3273 3274 #ifdef __APPLE__ 3275 // XXXDARWIN 3276 // Work around the unaligned VM callbacks in hotspot's 3277 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3278 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3279 // alignment when doing symbol lookup. To work around this, we force early 3280 // binding of all symbols now, thus binding when alignment is known-good. 3281 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3282 #endif 3283 3284 os::Posix::init(); 3285 } 3286 3287 // To install functions for atexit system call 3288 extern "C" { 3289 static void perfMemory_exit_helper() { 3290 perfMemory_exit(); 3291 } 3292 } 3293 3294 // this is called _after_ the global arguments have been parsed 3295 jint os::init_2(void) { 3296 3297 os::Posix::init_2(); 3298 3299 // initialize suspend/resume support - must do this before signal_sets_init() 3300 if (SR_initialize() != 0) { 3301 perror("SR_initialize failed"); 3302 return JNI_ERR; 3303 } 3304 3305 Bsd::signal_sets_init(); 3306 Bsd::install_signal_handlers(); 3307 3308 // Check and sets minimum stack sizes against command line options 3309 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3310 return JNI_ERR; 3311 } 3312 3313 if (MaxFDLimit) { 3314 // set the number of file descriptors to max. print out error 3315 // if getrlimit/setrlimit fails but continue regardless. 3316 struct rlimit nbr_files; 3317 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3318 if (status != 0) { 3319 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3320 } else { 3321 nbr_files.rlim_cur = nbr_files.rlim_max; 3322 3323 #ifdef __APPLE__ 3324 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3325 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3326 // be used instead 3327 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3328 #endif 3329 3330 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3331 if (status != 0) { 3332 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3333 } 3334 } 3335 } 3336 3337 // at-exit methods are called in the reverse order of their registration. 3338 // atexit functions are called on return from main or as a result of a 3339 // call to exit(3C). There can be only 32 of these functions registered 3340 // and atexit() does not set errno. 3341 3342 if (PerfAllowAtExitRegistration) { 3343 // only register atexit functions if PerfAllowAtExitRegistration is set. 3344 // atexit functions can be delayed until process exit time, which 3345 // can be problematic for embedded VM situations. Embedded VMs should 3346 // call DestroyJavaVM() to assure that VM resources are released. 3347 3348 // note: perfMemory_exit_helper atexit function may be removed in 3349 // the future if the appropriate cleanup code can be added to the 3350 // VM_Exit VMOperation's doit method. 3351 if (atexit(perfMemory_exit_helper) != 0) { 3352 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3353 } 3354 } 3355 3356 // initialize thread priority policy 3357 prio_init(); 3358 3359 #ifdef __APPLE__ 3360 // dynamically link to objective c gc registration 3361 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3362 if (handleLibObjc != NULL) { 3363 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3364 } 3365 #endif 3366 3367 return JNI_OK; 3368 } 3369 3370 // Mark the polling page as unreadable 3371 void os::make_polling_page_unreadable(void) { 3372 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3373 fatal("Could not disable polling page"); 3374 } 3375 } 3376 3377 // Mark the polling page as readable 3378 void os::make_polling_page_readable(void) { 3379 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3380 fatal("Could not enable polling page"); 3381 } 3382 } 3383 3384 int os::active_processor_count() { 3385 // User has overridden the number of active processors 3386 if (ActiveProcessorCount > 0) { 3387 log_trace(os)("active_processor_count: " 3388 "active processor count set by user : %d", 3389 ActiveProcessorCount); 3390 return ActiveProcessorCount; 3391 } 3392 3393 return _processor_count; 3394 } 3395 3396 void os::set_native_thread_name(const char *name) { 3397 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3398 // This is only supported in Snow Leopard and beyond 3399 if (name != NULL) { 3400 // Add a "Java: " prefix to the name 3401 char buf[MAXTHREADNAMESIZE]; 3402 snprintf(buf, sizeof(buf), "Java: %s", name); 3403 pthread_setname_np(buf); 3404 } 3405 #endif 3406 } 3407 3408 bool os::distribute_processes(uint length, uint* distribution) { 3409 // Not yet implemented. 3410 return false; 3411 } 3412 3413 bool os::bind_to_processor(uint processor_id) { 3414 // Not yet implemented. 3415 return false; 3416 } 3417 3418 void os::SuspendedThreadTask::internal_do_task() { 3419 if (do_suspend(_thread->osthread())) { 3420 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3421 do_task(context); 3422 do_resume(_thread->osthread()); 3423 } 3424 } 3425 3426 //////////////////////////////////////////////////////////////////////////////// 3427 // debug support 3428 3429 bool os::find(address addr, outputStream* st) { 3430 Dl_info dlinfo; 3431 memset(&dlinfo, 0, sizeof(dlinfo)); 3432 if (dladdr(addr, &dlinfo) != 0) { 3433 st->print(INTPTR_FORMAT ": ", (intptr_t)addr); 3434 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3435 st->print("%s+%#x", dlinfo.dli_sname, 3436 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr)); 3437 } else if (dlinfo.dli_fbase != NULL) { 3438 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase)); 3439 } else { 3440 st->print("<absolute address>"); 3441 } 3442 if (dlinfo.dli_fname != NULL) { 3443 st->print(" in %s", dlinfo.dli_fname); 3444 } 3445 if (dlinfo.dli_fbase != NULL) { 3446 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase); 3447 } 3448 st->cr(); 3449 3450 if (Verbose) { 3451 // decode some bytes around the PC 3452 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3453 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3454 address lowest = (address) dlinfo.dli_sname; 3455 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3456 if (begin < lowest) begin = lowest; 3457 Dl_info dlinfo2; 3458 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3459 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3460 end = (address) dlinfo2.dli_saddr; 3461 } 3462 Disassembler::decode(begin, end, st); 3463 } 3464 return true; 3465 } 3466 return false; 3467 } 3468 3469 //////////////////////////////////////////////////////////////////////////////// 3470 // misc 3471 3472 // This does not do anything on Bsd. This is basically a hook for being 3473 // able to use structured exception handling (thread-local exception filters) 3474 // on, e.g., Win32. 3475 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3476 const methodHandle& method, JavaCallArguments* args, 3477 Thread* thread) { 3478 f(value, method, args, thread); 3479 } 3480 3481 void os::print_statistics() { 3482 } 3483 3484 bool os::message_box(const char* title, const char* message) { 3485 int i; 3486 fdStream err(defaultStream::error_fd()); 3487 for (i = 0; i < 78; i++) err.print_raw("="); 3488 err.cr(); 3489 err.print_raw_cr(title); 3490 for (i = 0; i < 78; i++) err.print_raw("-"); 3491 err.cr(); 3492 err.print_raw_cr(message); 3493 for (i = 0; i < 78; i++) err.print_raw("="); 3494 err.cr(); 3495 3496 char buf[16]; 3497 // Prevent process from exiting upon "read error" without consuming all CPU 3498 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3499 3500 return buf[0] == 'y' || buf[0] == 'Y'; 3501 } 3502 3503 int os::stat(const char *path, struct stat *sbuf) { 3504 char pathbuf[MAX_PATH]; 3505 if (strlen(path) > MAX_PATH - 1) { 3506 errno = ENAMETOOLONG; 3507 return -1; 3508 } 3509 os::native_path(strcpy(pathbuf, path)); 3510 return ::stat(pathbuf, sbuf); 3511 } 3512 3513 static inline struct timespec get_mtime(const char* filename) { 3514 struct stat st; 3515 int ret = os::stat(filename, &st); 3516 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3517 #ifdef __APPLE__ 3518 return st.st_mtimespec; 3519 #else 3520 return st.st_mtim; 3521 #endif 3522 } 3523 3524 int os::compare_file_modified_times(const char* file1, const char* file2) { 3525 struct timespec filetime1 = get_mtime(file1); 3526 struct timespec filetime2 = get_mtime(file2); 3527 int diff = filetime1.tv_sec - filetime2.tv_sec; 3528 if (diff == 0) { 3529 return filetime1.tv_nsec - filetime2.tv_nsec; 3530 } 3531 return diff; 3532 } 3533 3534 // Is a (classpath) directory empty? 3535 bool os::dir_is_empty(const char* path) { 3536 DIR *dir = NULL; 3537 struct dirent *ptr; 3538 3539 dir = opendir(path); 3540 if (dir == NULL) return true; 3541 3542 // Scan the directory 3543 bool result = true; 3544 char buf[sizeof(struct dirent) + MAX_PATH]; 3545 while (result && (ptr = ::readdir(dir)) != NULL) { 3546 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3547 result = false; 3548 } 3549 } 3550 closedir(dir); 3551 return result; 3552 } 3553 3554 // This code originates from JDK's sysOpen and open64_w 3555 // from src/solaris/hpi/src/system_md.c 3556 3557 int os::open(const char *path, int oflag, int mode) { 3558 if (strlen(path) > MAX_PATH - 1) { 3559 errno = ENAMETOOLONG; 3560 return -1; 3561 } 3562 int fd; 3563 3564 fd = ::open(path, oflag, mode); 3565 if (fd == -1) return -1; 3566 3567 // If the open succeeded, the file might still be a directory 3568 { 3569 struct stat buf; 3570 int ret = ::fstat(fd, &buf); 3571 int st_mode = buf.st_mode; 3572 3573 if (ret != -1) { 3574 if ((st_mode & S_IFMT) == S_IFDIR) { 3575 errno = EISDIR; 3576 ::close(fd); 3577 return -1; 3578 } 3579 } else { 3580 ::close(fd); 3581 return -1; 3582 } 3583 } 3584 3585 // All file descriptors that are opened in the JVM and not 3586 // specifically destined for a subprocess should have the 3587 // close-on-exec flag set. If we don't set it, then careless 3rd 3588 // party native code might fork and exec without closing all 3589 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3590 // UNIXProcess.c), and this in turn might: 3591 // 3592 // - cause end-of-file to fail to be detected on some file 3593 // descriptors, resulting in mysterious hangs, or 3594 // 3595 // - might cause an fopen in the subprocess to fail on a system 3596 // suffering from bug 1085341. 3597 // 3598 // (Yes, the default setting of the close-on-exec flag is a Unix 3599 // design flaw) 3600 // 3601 // See: 3602 // 1085341: 32-bit stdio routines should support file descriptors >255 3603 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3604 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3605 // 3606 #ifdef FD_CLOEXEC 3607 { 3608 int flags = ::fcntl(fd, F_GETFD); 3609 if (flags != -1) { 3610 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3611 } 3612 } 3613 #endif 3614 3615 return fd; 3616 } 3617 3618 3619 // create binary file, rewriting existing file if required 3620 int os::create_binary_file(const char* path, bool rewrite_existing) { 3621 int oflags = O_WRONLY | O_CREAT; 3622 if (!rewrite_existing) { 3623 oflags |= O_EXCL; 3624 } 3625 return ::open(path, oflags, S_IREAD | S_IWRITE); 3626 } 3627 3628 // return current position of file pointer 3629 jlong os::current_file_offset(int fd) { 3630 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3631 } 3632 3633 // move file pointer to the specified offset 3634 jlong os::seek_to_file_offset(int fd, jlong offset) { 3635 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3636 } 3637 3638 // This code originates from JDK's sysAvailable 3639 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3640 3641 int os::available(int fd, jlong *bytes) { 3642 jlong cur, end; 3643 int mode; 3644 struct stat buf; 3645 3646 if (::fstat(fd, &buf) >= 0) { 3647 mode = buf.st_mode; 3648 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3649 int n; 3650 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3651 *bytes = n; 3652 return 1; 3653 } 3654 } 3655 } 3656 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3657 return 0; 3658 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3659 return 0; 3660 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3661 return 0; 3662 } 3663 *bytes = end - cur; 3664 return 1; 3665 } 3666 3667 // Map a block of memory. 3668 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3669 char *addr, size_t bytes, bool read_only, 3670 bool allow_exec) { 3671 int prot; 3672 int flags; 3673 3674 if (read_only) { 3675 prot = PROT_READ; 3676 flags = MAP_SHARED; 3677 } else { 3678 prot = PROT_READ | PROT_WRITE; 3679 flags = MAP_PRIVATE; 3680 } 3681 3682 if (allow_exec) { 3683 prot |= PROT_EXEC; 3684 } 3685 3686 if (addr != NULL) { 3687 flags |= MAP_FIXED; 3688 } 3689 3690 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3691 fd, file_offset); 3692 if (mapped_address == MAP_FAILED) { 3693 return NULL; 3694 } 3695 return mapped_address; 3696 } 3697 3698 3699 // Remap a block of memory. 3700 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3701 char *addr, size_t bytes, bool read_only, 3702 bool allow_exec) { 3703 // same as map_memory() on this OS 3704 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3705 allow_exec); 3706 } 3707 3708 3709 // Unmap a block of memory. 3710 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3711 return munmap(addr, bytes) == 0; 3712 } 3713 3714 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3715 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3716 // of a thread. 3717 // 3718 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3719 // the fast estimate available on the platform. 3720 3721 jlong os::current_thread_cpu_time() { 3722 #ifdef __APPLE__ 3723 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3724 #else 3725 Unimplemented(); 3726 return 0; 3727 #endif 3728 } 3729 3730 jlong os::thread_cpu_time(Thread* thread) { 3731 #ifdef __APPLE__ 3732 return os::thread_cpu_time(thread, true /* user + sys */); 3733 #else 3734 Unimplemented(); 3735 return 0; 3736 #endif 3737 } 3738 3739 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3740 #ifdef __APPLE__ 3741 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3742 #else 3743 Unimplemented(); 3744 return 0; 3745 #endif 3746 } 3747 3748 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3749 #ifdef __APPLE__ 3750 struct thread_basic_info tinfo; 3751 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3752 kern_return_t kr; 3753 thread_t mach_thread; 3754 3755 mach_thread = thread->osthread()->thread_id(); 3756 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3757 if (kr != KERN_SUCCESS) { 3758 return -1; 3759 } 3760 3761 if (user_sys_cpu_time) { 3762 jlong nanos; 3763 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3764 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3765 return nanos; 3766 } else { 3767 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3768 } 3769 #else 3770 Unimplemented(); 3771 return 0; 3772 #endif 3773 } 3774 3775 3776 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3777 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3778 info_ptr->may_skip_backward = false; // elapsed time not wall time 3779 info_ptr->may_skip_forward = false; // elapsed time not wall time 3780 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3781 } 3782 3783 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3784 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3785 info_ptr->may_skip_backward = false; // elapsed time not wall time 3786 info_ptr->may_skip_forward = false; // elapsed time not wall time 3787 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3788 } 3789 3790 bool os::is_thread_cpu_time_supported() { 3791 #ifdef __APPLE__ 3792 return true; 3793 #else 3794 return false; 3795 #endif 3796 } 3797 3798 // System loadavg support. Returns -1 if load average cannot be obtained. 3799 // Bsd doesn't yet have a (official) notion of processor sets, 3800 // so just return the system wide load average. 3801 int os::loadavg(double loadavg[], int nelem) { 3802 return ::getloadavg(loadavg, nelem); 3803 } 3804 3805 void os::pause() { 3806 char filename[MAX_PATH]; 3807 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3808 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3809 } else { 3810 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3811 } 3812 3813 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3814 if (fd != -1) { 3815 struct stat buf; 3816 ::close(fd); 3817 while (::stat(filename, &buf) == 0) { 3818 (void)::poll(NULL, 0, 100); 3819 } 3820 } else { 3821 jio_fprintf(stderr, 3822 "Could not open pause file '%s', continuing immediately.\n", filename); 3823 } 3824 } 3825 3826 // Darwin has no "environ" in a dynamic library. 3827 #ifdef __APPLE__ 3828 #include <crt_externs.h> 3829 #define environ (*_NSGetEnviron()) 3830 #else 3831 extern char** environ; 3832 #endif 3833 3834 // Run the specified command in a separate process. Return its exit value, 3835 // or -1 on failure (e.g. can't fork a new process). 3836 // Unlike system(), this function can be called from signal handler. It 3837 // doesn't block SIGINT et al. 3838 int os::fork_and_exec(char* cmd) { 3839 const char * argv[4] = {"sh", "-c", cmd, NULL}; 3840 3841 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 3842 // pthread_atfork handlers and reset pthread library. All we need is a 3843 // separate process to execve. Make a direct syscall to fork process. 3844 // On IA64 there's no fork syscall, we have to use fork() and hope for 3845 // the best... 3846 pid_t pid = fork(); 3847 3848 if (pid < 0) { 3849 // fork failed 3850 return -1; 3851 3852 } else if (pid == 0) { 3853 // child process 3854 3855 // execve() in BsdThreads will call pthread_kill_other_threads_np() 3856 // first to kill every thread on the thread list. Because this list is 3857 // not reset by fork() (see notes above), execve() will instead kill 3858 // every thread in the parent process. We know this is the only thread 3859 // in the new process, so make a system call directly. 3860 // IA64 should use normal execve() from glibc to match the glibc fork() 3861 // above. 3862 execve("/bin/sh", (char* const*)argv, environ); 3863 3864 // execve failed 3865 _exit(-1); 3866 3867 } else { 3868 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 3869 // care about the actual exit code, for now. 3870 3871 int status; 3872 3873 // Wait for the child process to exit. This returns immediately if 3874 // the child has already exited. */ 3875 while (waitpid(pid, &status, 0) < 0) { 3876 switch (errno) { 3877 case ECHILD: return 0; 3878 case EINTR: break; 3879 default: return -1; 3880 } 3881 } 3882 3883 if (WIFEXITED(status)) { 3884 // The child exited normally; get its exit code. 3885 return WEXITSTATUS(status); 3886 } else if (WIFSIGNALED(status)) { 3887 // The child exited because of a signal 3888 // The best value to return is 0x80 + signal number, 3889 // because that is what all Unix shells do, and because 3890 // it allows callers to distinguish between process exit and 3891 // process death by signal. 3892 return 0x80 + WTERMSIG(status); 3893 } else { 3894 // Unknown exit code; pass it through 3895 return status; 3896 } 3897 } 3898 } 3899 3900 // is_headless_jre() 3901 // 3902 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 3903 // in order to report if we are running in a headless jre 3904 // 3905 // Since JDK8 xawt/libmawt.so was moved into the same directory 3906 // as libawt.so, and renamed libawt_xawt.so 3907 // 3908 bool os::is_headless_jre() { 3909 #ifdef __APPLE__ 3910 // We no longer build headless-only on Mac OS X 3911 return false; 3912 #else 3913 struct stat statbuf; 3914 char buf[MAXPATHLEN]; 3915 char libmawtpath[MAXPATHLEN]; 3916 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 3917 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 3918 char *p; 3919 3920 // Get path to libjvm.so 3921 os::jvm_path(buf, sizeof(buf)); 3922 3923 // Get rid of libjvm.so 3924 p = strrchr(buf, '/'); 3925 if (p == NULL) { 3926 return false; 3927 } else { 3928 *p = '\0'; 3929 } 3930 3931 // Get rid of client or server 3932 p = strrchr(buf, '/'); 3933 if (p == NULL) { 3934 return false; 3935 } else { 3936 *p = '\0'; 3937 } 3938 3939 // check xawt/libmawt.so 3940 strcpy(libmawtpath, buf); 3941 strcat(libmawtpath, xawtstr); 3942 if (::stat(libmawtpath, &statbuf) == 0) return false; 3943 3944 // check libawt_xawt.so 3945 strcpy(libmawtpath, buf); 3946 strcat(libmawtpath, new_xawtstr); 3947 if (::stat(libmawtpath, &statbuf) == 0) return false; 3948 3949 return true; 3950 #endif 3951 } 3952 3953 // Get the default path to the core file 3954 // Returns the length of the string 3955 int os::get_core_path(char* buffer, size_t bufferSize) { 3956 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 3957 3958 // Truncate if theoretical string was longer than bufferSize 3959 n = MIN2(n, (int)bufferSize); 3960 3961 return n; 3962 } 3963 3964 #ifndef PRODUCT 3965 void TestReserveMemorySpecial_test() { 3966 // No tests available for this platform 3967 } 3968 #endif 3969 3970 bool os::start_debugging(char *buf, int buflen) { 3971 int len = (int)strlen(buf); 3972 char *p = &buf[len]; 3973 3974 jio_snprintf(p, buflen-len, 3975 "\n\n" 3976 "Do you want to debug the problem?\n\n" 3977 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 3978 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 3979 "Otherwise, press RETURN to abort...", 3980 os::current_process_id(), os::current_process_id(), 3981 os::current_thread_id(), os::current_thread_id()); 3982 3983 bool yes = os::message_box("Unexpected Error", buf); 3984 3985 if (yes) { 3986 // yes, user asked VM to launch debugger 3987 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 3988 os::current_process_id(), os::current_process_id()); 3989 3990 os::fork_and_exec(buf); 3991 yes = false; 3992 } 3993 return yes; 3994 }