1 /* 2 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_bsd.h" 35 #include "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.h" 43 #include "prims/jvm_misc.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/atomic.hpp" 46 #include "runtime/extendedPC.hpp" 47 #include "runtime/globals.hpp" 48 #include "runtime/interfaceSupport.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/javaCalls.hpp" 51 #include "runtime/mutexLocker.hpp" 52 #include "runtime/objectMonitor.hpp" 53 #include "runtime/orderAccess.inline.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.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 "semaphore_bsd.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/memTracker.hpp" 65 #include "services/runtimeService.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 <semaphore.h> 95 # include <fcntl.h> 96 # include <string.h> 97 # include <sys/param.h> 98 # include <sys/sysctl.h> 99 # include <sys/ipc.h> 100 # include <sys/shm.h> 101 #ifndef __APPLE__ 102 # include <link.h> 103 #endif 104 # include <stdint.h> 105 # include <inttypes.h> 106 # include <sys/ioctl.h> 107 # include <sys/syscall.h> 108 109 #if defined(__FreeBSD__) || defined(__NetBSD__) 110 #include <elf.h> 111 #endif 112 113 #ifdef __APPLE__ 114 #include <mach/mach.h> // semaphore_* API 115 #include <mach-o/dyld.h> 116 #include <sys/proc_info.h> 117 #include <objc/objc-auto.h> 118 #endif 119 120 #ifndef MAP_ANONYMOUS 121 #define MAP_ANONYMOUS MAP_ANON 122 #endif 123 124 #define MAX_PATH (2 * K) 125 126 // for timer info max values which include all bits 127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 128 129 #define LARGEPAGES_BIT (1 << 6) 130 131 //////////////////////////////////////////////////////////////////////////////// 132 // global variables 133 julong os::Bsd::_physical_memory = 0; 134 135 #ifdef __APPLE__ 136 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; 137 volatile uint64_t os::Bsd::_max_abstime = 0; 138 #else 139 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 140 #endif 141 pthread_t os::Bsd::_main_thread; 142 int os::Bsd::_page_size = -1; 143 144 static jlong initial_time_count=0; 145 146 static int clock_tics_per_sec = 100; 147 148 // For diagnostics to print a message once. see run_periodic_checks 149 static sigset_t check_signal_done; 150 static bool check_signals = true; 151 152 static pid_t _initial_pid = 0; 153 154 // Signal number used to suspend/resume a thread 155 156 // do not use any signal number less than SIGSEGV, see 4355769 157 static int SR_signum = SIGUSR2; 158 sigset_t SR_sigset; 159 160 161 //////////////////////////////////////////////////////////////////////////////// 162 // utility functions 163 164 static int SR_initialize(); 165 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 166 167 julong os::available_memory() { 168 return Bsd::available_memory(); 169 } 170 171 // available here means free 172 julong os::Bsd::available_memory() { 173 uint64_t available = physical_memory() >> 2; 174 #ifdef __APPLE__ 175 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; 176 vm_statistics64_data_t vmstat; 177 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, 178 (host_info64_t)&vmstat, &count); 179 assert(kerr == KERN_SUCCESS, 180 "host_statistics64 failed - check mach_host_self() and count"); 181 if (kerr == KERN_SUCCESS) { 182 available = vmstat.free_count * os::vm_page_size(); 183 } 184 #endif 185 return available; 186 } 187 188 julong os::physical_memory() { 189 return Bsd::physical_memory(); 190 } 191 192 // Return true if user is running as root. 193 194 bool os::have_special_privileges() { 195 static bool init = false; 196 static bool privileges = false; 197 if (!init) { 198 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 199 init = true; 200 } 201 return privileges; 202 } 203 204 205 206 // Cpu architecture string 207 #if defined(ZERO) 208 static char cpu_arch[] = ZERO_LIBARCH; 209 #elif defined(IA64) 210 static char cpu_arch[] = "ia64"; 211 #elif defined(IA32) 212 static char cpu_arch[] = "i386"; 213 #elif defined(AMD64) 214 static char cpu_arch[] = "amd64"; 215 #elif defined(ARM) 216 static char cpu_arch[] = "arm"; 217 #elif defined(PPC32) 218 static char cpu_arch[] = "ppc"; 219 #elif defined(SPARC) 220 #ifdef _LP64 221 static char cpu_arch[] = "sparcv9"; 222 #else 223 static char cpu_arch[] = "sparc"; 224 #endif 225 #else 226 #error Add appropriate cpu_arch setting 227 #endif 228 229 // Compiler variant 230 #ifdef COMPILER2 231 #define COMPILER_VARIANT "server" 232 #else 233 #define COMPILER_VARIANT "client" 234 #endif 235 236 237 void os::Bsd::initialize_system_info() { 238 int mib[2]; 239 size_t len; 240 int cpu_val; 241 julong mem_val; 242 243 // get processors count via hw.ncpus sysctl 244 mib[0] = CTL_HW; 245 mib[1] = HW_NCPU; 246 len = sizeof(cpu_val); 247 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 248 assert(len == sizeof(cpu_val), "unexpected data size"); 249 set_processor_count(cpu_val); 250 } else { 251 set_processor_count(1); // fallback 252 } 253 254 // get physical memory via hw.memsize sysctl (hw.memsize is used 255 // since it returns a 64 bit value) 256 mib[0] = CTL_HW; 257 258 #if defined (HW_MEMSIZE) // Apple 259 mib[1] = HW_MEMSIZE; 260 #elif defined(HW_PHYSMEM) // Most of BSD 261 mib[1] = HW_PHYSMEM; 262 #elif defined(HW_REALMEM) // Old FreeBSD 263 mib[1] = HW_REALMEM; 264 #else 265 #error No ways to get physmem 266 #endif 267 268 len = sizeof(mem_val); 269 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 270 assert(len == sizeof(mem_val), "unexpected data size"); 271 _physical_memory = mem_val; 272 } else { 273 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?) 274 } 275 276 #ifdef __OpenBSD__ 277 { 278 // limit _physical_memory memory view on OpenBSD since 279 // datasize rlimit restricts us anyway. 280 struct rlimit limits; 281 getrlimit(RLIMIT_DATA, &limits); 282 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 283 } 284 #endif 285 } 286 287 #ifdef __APPLE__ 288 static const char *get_home() { 289 const char *home_dir = ::getenv("HOME"); 290 if ((home_dir == NULL) || (*home_dir == '\0')) { 291 struct passwd *passwd_info = getpwuid(geteuid()); 292 if (passwd_info != NULL) { 293 home_dir = passwd_info->pw_dir; 294 } 295 } 296 297 return home_dir; 298 } 299 #endif 300 301 void os::init_system_properties_values() { 302 // The next steps are taken in the product version: 303 // 304 // Obtain the JAVA_HOME value from the location of libjvm.so. 305 // This library should be located at: 306 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 307 // 308 // If "/jre/lib/" appears at the right place in the path, then we 309 // assume libjvm.so is installed in a JDK and we use this path. 310 // 311 // Otherwise exit with message: "Could not create the Java virtual machine." 312 // 313 // The following extra steps are taken in the debugging version: 314 // 315 // If "/jre/lib/" does NOT appear at the right place in the path 316 // instead of exit check for $JAVA_HOME environment variable. 317 // 318 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 319 // then we append a fake suffix "hotspot/libjvm.so" to this path so 320 // it looks like libjvm.so is installed there 321 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 322 // 323 // Otherwise exit. 324 // 325 // Important note: if the location of libjvm.so changes this 326 // code needs to be changed accordingly. 327 328 // See ld(1): 329 // The linker uses the following search paths to locate required 330 // shared libraries: 331 // 1: ... 332 // ... 333 // 7: The default directories, normally /lib and /usr/lib. 334 #ifndef DEFAULT_LIBPATH 335 #define DEFAULT_LIBPATH "/lib:/usr/lib" 336 #endif 337 338 // Base path of extensions installed on the system. 339 #define SYS_EXT_DIR "/usr/java/packages" 340 #define EXTENSIONS_DIR "/lib/ext" 341 342 #ifndef __APPLE__ 343 344 // Buffer that fits several sprintfs. 345 // Note that the space for the colon and the trailing null are provided 346 // by the nulls included by the sizeof operator. 347 const size_t bufsize = 348 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 349 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 350 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 351 352 // sysclasspath, java_home, dll_dir 353 { 354 char *pslash; 355 os::jvm_path(buf, bufsize); 356 357 // Found the full path to libjvm.so. 358 // Now cut the path to <java_home>/jre if we can. 359 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 360 pslash = strrchr(buf, '/'); 361 if (pslash != NULL) { 362 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 363 } 364 Arguments::set_dll_dir(buf); 365 366 if (pslash != NULL) { 367 pslash = strrchr(buf, '/'); 368 if (pslash != NULL) { 369 *pslash = '\0'; // Get rid of /<arch>. 370 pslash = strrchr(buf, '/'); 371 if (pslash != NULL) { 372 *pslash = '\0'; // Get rid of /lib. 373 } 374 } 375 } 376 Arguments::set_java_home(buf); 377 set_boot_path('/', ':'); 378 } 379 380 // Where to look for native libraries. 381 // 382 // Note: Due to a legacy implementation, most of the library path 383 // is set in the launcher. This was to accomodate linking restrictions 384 // on legacy Bsd implementations (which are no longer supported). 385 // Eventually, all the library path setting will be done here. 386 // 387 // However, to prevent the proliferation of improperly built native 388 // libraries, the new path component /usr/java/packages is added here. 389 // Eventually, all the library path setting will be done here. 390 { 391 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 392 // should always exist (until the legacy problem cited above is 393 // addressed). 394 const char *v = ::getenv("LD_LIBRARY_PATH"); 395 const char *v_colon = ":"; 396 if (v == NULL) { v = ""; v_colon = ""; } 397 // That's +1 for the colon and +1 for the trailing '\0'. 398 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 399 strlen(v) + 1 + 400 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, 401 mtInternal); 402 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); 403 Arguments::set_library_path(ld_library_path); 404 FREE_C_HEAP_ARRAY(char, ld_library_path); 405 } 406 407 // Extensions directories. 408 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 409 Arguments::set_ext_dirs(buf); 410 411 FREE_C_HEAP_ARRAY(char, buf); 412 413 #else // __APPLE__ 414 415 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 416 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 417 418 const char *user_home_dir = get_home(); 419 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. 420 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 421 sizeof(SYS_EXTENSIONS_DIRS); 422 423 // Buffer that fits several sprintfs. 424 // Note that the space for the colon and the trailing null are provided 425 // by the nulls included by the sizeof operator. 426 const size_t bufsize = 427 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends. 428 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir 429 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 430 431 // sysclasspath, java_home, dll_dir 432 { 433 char *pslash; 434 os::jvm_path(buf, bufsize); 435 436 // Found the full path to libjvm.so. 437 // Now cut the path to <java_home>/jre if we can. 438 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 439 pslash = strrchr(buf, '/'); 440 if (pslash != NULL) { 441 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 442 } 443 #ifdef STATIC_BUILD 444 strcat(buf, "/lib"); 445 #endif 446 447 Arguments::set_dll_dir(buf); 448 449 if (pslash != NULL) { 450 pslash = strrchr(buf, '/'); 451 if (pslash != NULL) { 452 *pslash = '\0'; // Get rid of /lib. 453 } 454 } 455 Arguments::set_java_home(buf); 456 set_boot_path('/', ':'); 457 } 458 459 // Where to look for native libraries. 460 // 461 // Note: Due to a legacy implementation, most of the library path 462 // is set in the launcher. This was to accomodate linking restrictions 463 // on legacy Bsd implementations (which are no longer supported). 464 // Eventually, all the library path setting will be done here. 465 // 466 // However, to prevent the proliferation of improperly built native 467 // libraries, the new path component /usr/java/packages is added here. 468 // Eventually, all the library path setting will be done here. 469 { 470 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 471 // should always exist (until the legacy problem cited above is 472 // addressed). 473 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code 474 // can specify a directory inside an app wrapper 475 const char *l = ::getenv("JAVA_LIBRARY_PATH"); 476 const char *l_colon = ":"; 477 if (l == NULL) { l = ""; l_colon = ""; } 478 479 const char *v = ::getenv("DYLD_LIBRARY_PATH"); 480 const char *v_colon = ":"; 481 if (v == NULL) { v = ""; v_colon = ""; } 482 483 // Apple's Java6 has "." at the beginning of java.library.path. 484 // OpenJDK on Windows has "." at the end of java.library.path. 485 // OpenJDK on Linux and Solaris don't have "." in java.library.path 486 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 487 // "." is appended to the end of java.library.path. Yes, this 488 // could cause a change in behavior, but Apple's Java6 behavior 489 // can be achieved by putting "." at the beginning of the 490 // JAVA_LIBRARY_PATH environment variable. 491 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 492 strlen(v) + 1 + strlen(l) + 1 + 493 system_ext_size + 3, 494 mtInternal); 495 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", 496 v, v_colon, l, l_colon, user_home_dir); 497 Arguments::set_library_path(ld_library_path); 498 FREE_C_HEAP_ARRAY(char, ld_library_path); 499 } 500 501 // Extensions directories. 502 // 503 // Note that the space for the colon and the trailing null are provided 504 // by the nulls included by the sizeof operator (so actually one byte more 505 // than necessary is allocated). 506 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, 507 user_home_dir, Arguments::get_java_home()); 508 Arguments::set_ext_dirs(buf); 509 510 FREE_C_HEAP_ARRAY(char, buf); 511 512 #undef SYS_EXTENSIONS_DIR 513 #undef SYS_EXTENSIONS_DIRS 514 515 #endif // __APPLE__ 516 517 #undef SYS_EXT_DIR 518 #undef EXTENSIONS_DIR 519 } 520 521 //////////////////////////////////////////////////////////////////////////////// 522 // breakpoint support 523 524 void os::breakpoint() { 525 BREAKPOINT; 526 } 527 528 extern "C" void breakpoint() { 529 // use debugger to set breakpoint here 530 } 531 532 //////////////////////////////////////////////////////////////////////////////// 533 // signal support 534 535 debug_only(static bool signal_sets_initialized = false); 536 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 537 538 bool os::Bsd::is_sig_ignored(int sig) { 539 struct sigaction oact; 540 sigaction(sig, (struct sigaction*)NULL, &oact); 541 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 542 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 543 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 544 return true; 545 } else { 546 return false; 547 } 548 } 549 550 void os::Bsd::signal_sets_init() { 551 // Should also have an assertion stating we are still single-threaded. 552 assert(!signal_sets_initialized, "Already initialized"); 553 // Fill in signals that are necessarily unblocked for all threads in 554 // the VM. Currently, we unblock the following signals: 555 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 556 // by -Xrs (=ReduceSignalUsage)); 557 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 558 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 559 // the dispositions or masks wrt these signals. 560 // Programs embedding the VM that want to use the above signals for their 561 // own purposes must, at this time, use the "-Xrs" option to prevent 562 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 563 // (See bug 4345157, and other related bugs). 564 // In reality, though, unblocking these signals is really a nop, since 565 // these signals are not blocked by default. 566 sigemptyset(&unblocked_sigs); 567 sigemptyset(&allowdebug_blocked_sigs); 568 sigaddset(&unblocked_sigs, SIGILL); 569 sigaddset(&unblocked_sigs, SIGSEGV); 570 sigaddset(&unblocked_sigs, SIGBUS); 571 sigaddset(&unblocked_sigs, SIGFPE); 572 sigaddset(&unblocked_sigs, SR_signum); 573 574 if (!ReduceSignalUsage) { 575 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 576 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 577 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 578 } 579 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 580 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 581 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 582 } 583 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 584 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 585 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 586 } 587 } 588 // Fill in signals that are blocked by all but the VM thread. 589 sigemptyset(&vm_sigs); 590 if (!ReduceSignalUsage) { 591 sigaddset(&vm_sigs, BREAK_SIGNAL); 592 } 593 debug_only(signal_sets_initialized = true); 594 595 } 596 597 // These are signals that are unblocked while a thread is running Java. 598 // (For some reason, they get blocked by default.) 599 sigset_t* os::Bsd::unblocked_signals() { 600 assert(signal_sets_initialized, "Not initialized"); 601 return &unblocked_sigs; 602 } 603 604 // These are the signals that are blocked while a (non-VM) thread is 605 // running Java. Only the VM thread handles these signals. 606 sigset_t* os::Bsd::vm_signals() { 607 assert(signal_sets_initialized, "Not initialized"); 608 return &vm_sigs; 609 } 610 611 // These are signals that are blocked during cond_wait to allow debugger in 612 sigset_t* os::Bsd::allowdebug_blocked_signals() { 613 assert(signal_sets_initialized, "Not initialized"); 614 return &allowdebug_blocked_sigs; 615 } 616 617 void os::Bsd::hotspot_sigmask(Thread* thread) { 618 619 //Save caller's signal mask before setting VM signal mask 620 sigset_t caller_sigmask; 621 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 622 623 OSThread* osthread = thread->osthread(); 624 osthread->set_caller_sigmask(caller_sigmask); 625 626 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 627 628 if (!ReduceSignalUsage) { 629 if (thread->is_VM_thread()) { 630 // Only the VM thread handles BREAK_SIGNAL ... 631 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 632 } else { 633 // ... all other threads block BREAK_SIGNAL 634 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 635 } 636 } 637 } 638 639 640 ////////////////////////////////////////////////////////////////////////////// 641 // create new thread 642 643 #ifdef __APPLE__ 644 // library handle for calling objc_registerThreadWithCollector() 645 // without static linking to the libobjc library 646 #define OBJC_LIB "/usr/lib/libobjc.dylib" 647 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 648 typedef void (*objc_registerThreadWithCollector_t)(); 649 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 650 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 651 #endif 652 653 #ifdef __APPLE__ 654 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 655 // Additional thread_id used to correlate threads in SA 656 thread_identifier_info_data_t m_ident_info; 657 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 658 659 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 660 (thread_info_t) &m_ident_info, &count); 661 662 return m_ident_info.thread_id; 663 } 664 #endif 665 666 // Thread start routine for all newly created threads 667 static void *thread_native_entry(Thread *thread) { 668 // Try to randomize the cache line index of hot stack frames. 669 // This helps when threads of the same stack traces evict each other's 670 // cache lines. The threads can be either from the same JVM instance, or 671 // from different JVM instances. The benefit is especially true for 672 // processors with hyperthreading technology. 673 static int counter = 0; 674 int pid = os::current_process_id(); 675 alloca(((pid ^ counter++) & 7) * 128); 676 677 thread->initialize_thread_current(); 678 679 OSThread* osthread = thread->osthread(); 680 Monitor* sync = osthread->startThread_lock(); 681 682 osthread->set_thread_id(os::Bsd::gettid()); 683 684 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 685 os::current_thread_id(), (uintx) pthread_self()); 686 687 #ifdef __APPLE__ 688 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 689 guarantee(unique_thread_id != 0, "unique thread id was not found"); 690 osthread->set_unique_thread_id(unique_thread_id); 691 #endif 692 // initialize signal mask for this thread 693 os::Bsd::hotspot_sigmask(thread); 694 695 // initialize floating point control register 696 os::Bsd::init_thread_fpu_state(); 697 698 #ifdef __APPLE__ 699 // register thread with objc gc 700 if (objc_registerThreadWithCollectorFunction != NULL) { 701 objc_registerThreadWithCollectorFunction(); 702 } 703 #endif 704 705 // handshaking with parent thread 706 { 707 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 708 709 // notify parent thread 710 osthread->set_state(INITIALIZED); 711 sync->notify_all(); 712 713 // wait until os::start_thread() 714 while (osthread->get_state() == INITIALIZED) { 715 sync->wait(Mutex::_no_safepoint_check_flag); 716 } 717 } 718 719 // call one more level start routine 720 thread->run(); 721 722 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 723 os::current_thread_id(), (uintx) pthread_self()); 724 725 // If a thread has not deleted itself ("delete this") as part of its 726 // termination sequence, we have to ensure thread-local-storage is 727 // cleared before we actually terminate. No threads should ever be 728 // deleted asynchronously with respect to their termination. 729 if (Thread::current_or_null_safe() != NULL) { 730 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 731 thread->clear_thread_current(); 732 } 733 734 return 0; 735 } 736 737 bool os::create_thread(Thread* thread, ThreadType thr_type, 738 size_t req_stack_size) { 739 assert(thread->osthread() == NULL, "caller responsible"); 740 741 // Allocate the OSThread object 742 OSThread* osthread = new OSThread(NULL, NULL); 743 if (osthread == NULL) { 744 return false; 745 } 746 747 // set the correct thread state 748 osthread->set_thread_type(thr_type); 749 750 // Initial state is ALLOCATED but not INITIALIZED 751 osthread->set_state(ALLOCATED); 752 753 thread->set_osthread(osthread); 754 755 // init thread attributes 756 pthread_attr_t attr; 757 pthread_attr_init(&attr); 758 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 759 760 // calculate stack size if it's not specified by caller 761 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 762 pthread_attr_setstacksize(&attr, stack_size); 763 764 ThreadState state; 765 766 { 767 pthread_t tid; 768 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 769 770 char buf[64]; 771 if (ret == 0) { 772 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 773 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 774 } else { 775 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 776 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 777 } 778 779 pthread_attr_destroy(&attr); 780 781 if (ret != 0) { 782 // Need to clean up stuff we've allocated so far 783 thread->set_osthread(NULL); 784 delete osthread; 785 return false; 786 } 787 788 // Store pthread info into the OSThread 789 osthread->set_pthread_id(tid); 790 791 // Wait until child thread is either initialized or aborted 792 { 793 Monitor* sync_with_child = osthread->startThread_lock(); 794 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 795 while ((state = osthread->get_state()) == ALLOCATED) { 796 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 797 } 798 } 799 800 } 801 802 // Aborted due to thread limit being reached 803 if (state == ZOMBIE) { 804 thread->set_osthread(NULL); 805 delete osthread; 806 return false; 807 } 808 809 // The thread is returned suspended (in state INITIALIZED), 810 // and is started higher up in the call chain 811 assert(state == INITIALIZED, "race condition"); 812 return true; 813 } 814 815 ///////////////////////////////////////////////////////////////////////////// 816 // attach existing thread 817 818 // bootstrap the main thread 819 bool os::create_main_thread(JavaThread* thread) { 820 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 821 return create_attached_thread(thread); 822 } 823 824 bool os::create_attached_thread(JavaThread* thread) { 825 #ifdef ASSERT 826 thread->verify_not_published(); 827 #endif 828 829 // Allocate the OSThread object 830 OSThread* osthread = new OSThread(NULL, NULL); 831 832 if (osthread == NULL) { 833 return false; 834 } 835 836 osthread->set_thread_id(os::Bsd::gettid()); 837 838 // Store pthread info into the OSThread 839 #ifdef __APPLE__ 840 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 841 guarantee(unique_thread_id != 0, "just checking"); 842 osthread->set_unique_thread_id(unique_thread_id); 843 #endif 844 osthread->set_pthread_id(::pthread_self()); 845 846 // initialize floating point control register 847 os::Bsd::init_thread_fpu_state(); 848 849 // Initial thread state is RUNNABLE 850 osthread->set_state(RUNNABLE); 851 852 thread->set_osthread(osthread); 853 854 // initialize signal mask for this thread 855 // and save the caller's signal mask 856 os::Bsd::hotspot_sigmask(thread); 857 858 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 859 os::current_thread_id(), (uintx) pthread_self()); 860 861 return true; 862 } 863 864 void os::pd_start_thread(Thread* thread) { 865 OSThread * osthread = thread->osthread(); 866 assert(osthread->get_state() != INITIALIZED, "just checking"); 867 Monitor* sync_with_child = osthread->startThread_lock(); 868 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 869 sync_with_child->notify(); 870 } 871 872 // Free Bsd resources related to the OSThread 873 void os::free_thread(OSThread* osthread) { 874 assert(osthread != NULL, "osthread not set"); 875 876 // We are told to free resources of the argument thread, 877 // but we can only really operate on the current thread. 878 assert(Thread::current()->osthread() == osthread, 879 "os::free_thread but not current thread"); 880 881 // Restore caller's signal mask 882 sigset_t sigmask = osthread->caller_sigmask(); 883 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 884 885 delete osthread; 886 } 887 888 //////////////////////////////////////////////////////////////////////////////// 889 // time support 890 891 // Time since start-up in seconds to a fine granularity. 892 // Used by VMSelfDestructTimer and the MemProfiler. 893 double os::elapsedTime() { 894 895 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 896 } 897 898 jlong os::elapsed_counter() { 899 return javaTimeNanos() - initial_time_count; 900 } 901 902 jlong os::elapsed_frequency() { 903 return NANOSECS_PER_SEC; // nanosecond resolution 904 } 905 906 bool os::supports_vtime() { return true; } 907 bool os::enable_vtime() { return false; } 908 bool os::vtime_enabled() { return false; } 909 910 double os::elapsedVTime() { 911 // better than nothing, but not much 912 return elapsedTime(); 913 } 914 915 jlong os::javaTimeMillis() { 916 timeval time; 917 int status = gettimeofday(&time, NULL); 918 assert(status != -1, "bsd error"); 919 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 920 } 921 922 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 923 timeval time; 924 int status = gettimeofday(&time, NULL); 925 assert(status != -1, "bsd error"); 926 seconds = jlong(time.tv_sec); 927 nanos = jlong(time.tv_usec) * 1000; 928 } 929 930 #ifndef __APPLE__ 931 #ifndef CLOCK_MONOTONIC 932 #define CLOCK_MONOTONIC (1) 933 #endif 934 #endif 935 936 #ifdef __APPLE__ 937 void os::Bsd::clock_init() { 938 mach_timebase_info(&_timebase_info); 939 } 940 #else 941 void os::Bsd::clock_init() { 942 struct timespec res; 943 struct timespec tp; 944 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 945 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 946 // yes, monotonic clock is supported 947 _clock_gettime = ::clock_gettime; 948 } 949 } 950 #endif 951 952 953 954 #ifdef __APPLE__ 955 956 jlong os::javaTimeNanos() { 957 const uint64_t tm = mach_absolute_time(); 958 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 959 const uint64_t prev = Bsd::_max_abstime; 960 if (now <= prev) { 961 return prev; // same or retrograde time; 962 } 963 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev); 964 assert(obsv >= prev, "invariant"); // Monotonicity 965 // If the CAS succeeded then we're done and return "now". 966 // If the CAS failed and the observed value "obsv" is >= now then 967 // we should return "obsv". If the CAS failed and now > obsv > prv then 968 // some other thread raced this thread and installed a new value, in which case 969 // we could either (a) retry the entire operation, (b) retry trying to install now 970 // or (c) just return obsv. We use (c). No loop is required although in some cases 971 // we might discard a higher "now" value in deference to a slightly lower but freshly 972 // installed obsv value. That's entirely benign -- it admits no new orderings compared 973 // to (a) or (b) -- and greatly reduces coherence traffic. 974 // We might also condition (c) on the magnitude of the delta between obsv and now. 975 // Avoiding excessive CAS operations to hot RW locations is critical. 976 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 977 return (prev == obsv) ? now : obsv; 978 } 979 980 #else // __APPLE__ 981 982 jlong os::javaTimeNanos() { 983 if (os::supports_monotonic_clock()) { 984 struct timespec tp; 985 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 986 assert(status == 0, "gettime error"); 987 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 988 return result; 989 } else { 990 timeval time; 991 int status = gettimeofday(&time, NULL); 992 assert(status != -1, "bsd error"); 993 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 994 return 1000 * usecs; 995 } 996 } 997 998 #endif // __APPLE__ 999 1000 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1001 if (os::supports_monotonic_clock()) { 1002 info_ptr->max_value = ALL_64_BITS; 1003 1004 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1005 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1006 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1007 } else { 1008 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1009 info_ptr->max_value = ALL_64_BITS; 1010 1011 // gettimeofday is a real time clock so it skips 1012 info_ptr->may_skip_backward = true; 1013 info_ptr->may_skip_forward = true; 1014 } 1015 1016 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1017 } 1018 1019 // Return the real, user, and system times in seconds from an 1020 // arbitrary fixed point in the past. 1021 bool os::getTimesSecs(double* process_real_time, 1022 double* process_user_time, 1023 double* process_system_time) { 1024 struct tms ticks; 1025 clock_t real_ticks = times(&ticks); 1026 1027 if (real_ticks == (clock_t) (-1)) { 1028 return false; 1029 } else { 1030 double ticks_per_second = (double) clock_tics_per_sec; 1031 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1032 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1033 *process_real_time = ((double) real_ticks) / ticks_per_second; 1034 1035 return true; 1036 } 1037 } 1038 1039 1040 char * os::local_time_string(char *buf, size_t buflen) { 1041 struct tm t; 1042 time_t long_time; 1043 time(&long_time); 1044 localtime_r(&long_time, &t); 1045 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1046 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1047 t.tm_hour, t.tm_min, t.tm_sec); 1048 return buf; 1049 } 1050 1051 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1052 return localtime_r(clock, res); 1053 } 1054 1055 //////////////////////////////////////////////////////////////////////////////// 1056 // runtime exit support 1057 1058 // Note: os::shutdown() might be called very early during initialization, or 1059 // called from signal handler. Before adding something to os::shutdown(), make 1060 // sure it is async-safe and can handle partially initialized VM. 1061 void os::shutdown() { 1062 1063 // allow PerfMemory to attempt cleanup of any persistent resources 1064 perfMemory_exit(); 1065 1066 // needs to remove object in file system 1067 AttachListener::abort(); 1068 1069 // flush buffered output, finish log files 1070 ostream_abort(); 1071 1072 // Check for abort hook 1073 abort_hook_t abort_hook = Arguments::abort_hook(); 1074 if (abort_hook != NULL) { 1075 abort_hook(); 1076 } 1077 1078 } 1079 1080 // Note: os::abort() might be called very early during initialization, or 1081 // called from signal handler. Before adding something to os::abort(), make 1082 // sure it is async-safe and can handle partially initialized VM. 1083 void os::abort(bool dump_core, void* siginfo, const void* context) { 1084 os::shutdown(); 1085 if (dump_core) { 1086 #ifndef PRODUCT 1087 fdStream out(defaultStream::output_fd()); 1088 out.print_raw("Current thread is "); 1089 char buf[16]; 1090 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1091 out.print_raw_cr(buf); 1092 out.print_raw_cr("Dumping core ..."); 1093 #endif 1094 ::abort(); // dump core 1095 } 1096 1097 ::exit(1); 1098 } 1099 1100 // Die immediately, no exit hook, no abort hook, no cleanup. 1101 void os::die() { 1102 // _exit() on BsdThreads only kills current thread 1103 ::abort(); 1104 } 1105 1106 // This method is a copy of JDK's sysGetLastErrorString 1107 // from src/solaris/hpi/src/system_md.c 1108 1109 size_t os::lasterror(char *buf, size_t len) { 1110 if (errno == 0) return 0; 1111 1112 const char *s = os::strerror(errno); 1113 size_t n = ::strlen(s); 1114 if (n >= len) { 1115 n = len - 1; 1116 } 1117 ::strncpy(buf, s, n); 1118 buf[n] = '\0'; 1119 return n; 1120 } 1121 1122 // Information of current thread in variety of formats 1123 pid_t os::Bsd::gettid() { 1124 int retval = -1; 1125 1126 #ifdef __APPLE__ //XNU kernel 1127 // despite the fact mach port is actually not a thread id use it 1128 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1129 retval = ::pthread_mach_thread_np(::pthread_self()); 1130 guarantee(retval != 0, "just checking"); 1131 return retval; 1132 1133 #else 1134 #ifdef __FreeBSD__ 1135 retval = syscall(SYS_thr_self); 1136 #else 1137 #ifdef __OpenBSD__ 1138 retval = syscall(SYS_getthrid); 1139 #else 1140 #ifdef __NetBSD__ 1141 retval = (pid_t) syscall(SYS__lwp_self); 1142 #endif 1143 #endif 1144 #endif 1145 #endif 1146 1147 if (retval == -1) { 1148 return getpid(); 1149 } 1150 } 1151 1152 intx os::current_thread_id() { 1153 #ifdef __APPLE__ 1154 return (intx)::pthread_mach_thread_np(::pthread_self()); 1155 #else 1156 return (intx)::pthread_self(); 1157 #endif 1158 } 1159 1160 int os::current_process_id() { 1161 1162 // Under the old bsd thread library, bsd gives each thread 1163 // its own process id. Because of this each thread will return 1164 // a different pid if this method were to return the result 1165 // of getpid(2). Bsd provides no api that returns the pid 1166 // of the launcher thread for the vm. This implementation 1167 // returns a unique pid, the pid of the launcher thread 1168 // that starts the vm 'process'. 1169 1170 // Under the NPTL, getpid() returns the same pid as the 1171 // launcher thread rather than a unique pid per thread. 1172 // Use gettid() if you want the old pre NPTL behaviour. 1173 1174 // if you are looking for the result of a call to getpid() that 1175 // returns a unique pid for the calling thread, then look at the 1176 // OSThread::thread_id() method in osThread_bsd.hpp file 1177 1178 return (int)(_initial_pid ? _initial_pid : getpid()); 1179 } 1180 1181 // DLL functions 1182 1183 #define JNI_LIB_PREFIX "lib" 1184 #ifdef __APPLE__ 1185 #define JNI_LIB_SUFFIX ".dylib" 1186 #else 1187 #define JNI_LIB_SUFFIX ".so" 1188 #endif 1189 1190 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1191 1192 // This must be hard coded because it's the system's temporary 1193 // directory not the java application's temp directory, ala java.io.tmpdir. 1194 #ifdef __APPLE__ 1195 // macosx has a secure per-user temporary directory 1196 char temp_path_storage[PATH_MAX]; 1197 const char* os::get_temp_directory() { 1198 static char *temp_path = NULL; 1199 if (temp_path == NULL) { 1200 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1201 if (pathSize == 0 || pathSize > PATH_MAX) { 1202 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1203 } 1204 temp_path = temp_path_storage; 1205 } 1206 return temp_path; 1207 } 1208 #else // __APPLE__ 1209 const char* os::get_temp_directory() { return "/tmp"; } 1210 #endif // __APPLE__ 1211 1212 static bool file_exists(const char* filename) { 1213 struct stat statbuf; 1214 if (filename == NULL || strlen(filename) == 0) { 1215 return false; 1216 } 1217 return os::stat(filename, &statbuf) == 0; 1218 } 1219 1220 bool os::dll_build_name(char* buffer, size_t buflen, 1221 const char* pname, const char* fname) { 1222 bool retval = false; 1223 // Copied from libhpi 1224 const size_t pnamelen = pname ? strlen(pname) : 0; 1225 1226 // Return error on buffer overflow. 1227 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1228 return retval; 1229 } 1230 1231 if (pnamelen == 0) { 1232 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1233 retval = true; 1234 } else if (strchr(pname, *os::path_separator()) != NULL) { 1235 int n; 1236 char** pelements = split_path(pname, &n); 1237 if (pelements == NULL) { 1238 return false; 1239 } 1240 for (int i = 0; i < n; i++) { 1241 // Really shouldn't be NULL, but check can't hurt 1242 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1243 continue; // skip the empty path values 1244 } 1245 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1246 pelements[i], fname); 1247 if (file_exists(buffer)) { 1248 retval = true; 1249 break; 1250 } 1251 } 1252 // release the storage 1253 for (int i = 0; i < n; i++) { 1254 if (pelements[i] != NULL) { 1255 FREE_C_HEAP_ARRAY(char, pelements[i]); 1256 } 1257 } 1258 if (pelements != NULL) { 1259 FREE_C_HEAP_ARRAY(char*, pelements); 1260 } 1261 } else { 1262 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1263 retval = true; 1264 } 1265 return retval; 1266 } 1267 1268 // check if addr is inside libjvm.so 1269 bool os::address_is_in_vm(address addr) { 1270 static address libjvm_base_addr; 1271 Dl_info dlinfo; 1272 1273 if (libjvm_base_addr == NULL) { 1274 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1275 libjvm_base_addr = (address)dlinfo.dli_fbase; 1276 } 1277 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1278 } 1279 1280 if (dladdr((void *)addr, &dlinfo) != 0) { 1281 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1282 } 1283 1284 return false; 1285 } 1286 1287 1288 #define MACH_MAXSYMLEN 256 1289 1290 bool os::dll_address_to_function_name(address addr, char *buf, 1291 int buflen, int *offset, 1292 bool demangle) { 1293 // buf is not optional, but offset is optional 1294 assert(buf != NULL, "sanity check"); 1295 1296 Dl_info dlinfo; 1297 char localbuf[MACH_MAXSYMLEN]; 1298 1299 if (dladdr((void*)addr, &dlinfo) != 0) { 1300 // see if we have a matching symbol 1301 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1302 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1303 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1304 } 1305 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1306 return true; 1307 } 1308 // no matching symbol so try for just file info 1309 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1310 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1311 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1312 return true; 1313 } 1314 } 1315 1316 // Handle non-dynamic manually: 1317 if (dlinfo.dli_fbase != NULL && 1318 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1319 dlinfo.dli_fbase)) { 1320 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1321 jio_snprintf(buf, buflen, "%s", localbuf); 1322 } 1323 return true; 1324 } 1325 } 1326 buf[0] = '\0'; 1327 if (offset != NULL) *offset = -1; 1328 return false; 1329 } 1330 1331 // ported from solaris version 1332 bool os::dll_address_to_library_name(address addr, char* buf, 1333 int buflen, int* offset) { 1334 // buf is not optional, but offset is optional 1335 assert(buf != NULL, "sanity check"); 1336 1337 Dl_info dlinfo; 1338 1339 if (dladdr((void*)addr, &dlinfo) != 0) { 1340 if (dlinfo.dli_fname != NULL) { 1341 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1342 } 1343 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1344 *offset = addr - (address)dlinfo.dli_fbase; 1345 } 1346 return true; 1347 } 1348 1349 buf[0] = '\0'; 1350 if (offset) *offset = -1; 1351 return false; 1352 } 1353 1354 // Loads .dll/.so and 1355 // in case of error it checks if .dll/.so was built for the 1356 // same architecture as Hotspot is running on 1357 1358 #ifdef __APPLE__ 1359 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1360 #ifdef STATIC_BUILD 1361 return os::get_default_process_handle(); 1362 #else 1363 void * result= ::dlopen(filename, RTLD_LAZY); 1364 if (result != NULL) { 1365 // Successful loading 1366 return result; 1367 } 1368 1369 // Read system error message into ebuf 1370 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1371 ebuf[ebuflen-1]='\0'; 1372 1373 return NULL; 1374 #endif // STATIC_BUILD 1375 } 1376 #else 1377 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1378 #ifdef STATIC_BUILD 1379 return os::get_default_process_handle(); 1380 #else 1381 void * result= ::dlopen(filename, RTLD_LAZY); 1382 if (result != NULL) { 1383 // Successful loading 1384 return result; 1385 } 1386 1387 Elf32_Ehdr elf_head; 1388 1389 // Read system error message into ebuf 1390 // It may or may not be overwritten below 1391 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1392 ebuf[ebuflen-1]='\0'; 1393 int diag_msg_max_length=ebuflen-strlen(ebuf); 1394 char* diag_msg_buf=ebuf+strlen(ebuf); 1395 1396 if (diag_msg_max_length==0) { 1397 // No more space in ebuf for additional diagnostics message 1398 return NULL; 1399 } 1400 1401 1402 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1403 1404 if (file_descriptor < 0) { 1405 // Can't open library, report dlerror() message 1406 return NULL; 1407 } 1408 1409 bool failed_to_read_elf_head= 1410 (sizeof(elf_head)!= 1411 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1412 1413 ::close(file_descriptor); 1414 if (failed_to_read_elf_head) { 1415 // file i/o error - report dlerror() msg 1416 return NULL; 1417 } 1418 1419 typedef struct { 1420 Elf32_Half code; // Actual value as defined in elf.h 1421 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1422 char elf_class; // 32 or 64 bit 1423 char endianess; // MSB or LSB 1424 char* name; // String representation 1425 } arch_t; 1426 1427 #ifndef EM_486 1428 #define EM_486 6 /* Intel 80486 */ 1429 #endif 1430 1431 #ifndef EM_MIPS_RS3_LE 1432 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1433 #endif 1434 1435 #ifndef EM_PPC64 1436 #define EM_PPC64 21 /* PowerPC64 */ 1437 #endif 1438 1439 #ifndef EM_S390 1440 #define EM_S390 22 /* IBM System/390 */ 1441 #endif 1442 1443 #ifndef EM_IA_64 1444 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1445 #endif 1446 1447 #ifndef EM_X86_64 1448 #define EM_X86_64 62 /* AMD x86-64 */ 1449 #endif 1450 1451 static const arch_t arch_array[]={ 1452 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1453 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1454 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1455 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1456 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1457 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1458 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1459 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1460 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1461 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1462 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1463 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1464 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1465 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1466 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1467 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1468 }; 1469 1470 #if (defined IA32) 1471 static Elf32_Half running_arch_code=EM_386; 1472 #elif (defined AMD64) 1473 static Elf32_Half running_arch_code=EM_X86_64; 1474 #elif (defined IA64) 1475 static Elf32_Half running_arch_code=EM_IA_64; 1476 #elif (defined __sparc) && (defined _LP64) 1477 static Elf32_Half running_arch_code=EM_SPARCV9; 1478 #elif (defined __sparc) && (!defined _LP64) 1479 static Elf32_Half running_arch_code=EM_SPARC; 1480 #elif (defined __powerpc64__) 1481 static Elf32_Half running_arch_code=EM_PPC64; 1482 #elif (defined __powerpc__) 1483 static Elf32_Half running_arch_code=EM_PPC; 1484 #elif (defined ARM) 1485 static Elf32_Half running_arch_code=EM_ARM; 1486 #elif (defined S390) 1487 static Elf32_Half running_arch_code=EM_S390; 1488 #elif (defined ALPHA) 1489 static Elf32_Half running_arch_code=EM_ALPHA; 1490 #elif (defined MIPSEL) 1491 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1492 #elif (defined PARISC) 1493 static Elf32_Half running_arch_code=EM_PARISC; 1494 #elif (defined MIPS) 1495 static Elf32_Half running_arch_code=EM_MIPS; 1496 #elif (defined M68K) 1497 static Elf32_Half running_arch_code=EM_68K; 1498 #else 1499 #error Method os::dll_load requires that one of following is defined:\ 1500 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1501 #endif 1502 1503 // Identify compatability class for VM's architecture and library's architecture 1504 // Obtain string descriptions for architectures 1505 1506 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1507 int running_arch_index=-1; 1508 1509 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1510 if (running_arch_code == arch_array[i].code) { 1511 running_arch_index = i; 1512 } 1513 if (lib_arch.code == arch_array[i].code) { 1514 lib_arch.compat_class = arch_array[i].compat_class; 1515 lib_arch.name = arch_array[i].name; 1516 } 1517 } 1518 1519 assert(running_arch_index != -1, 1520 "Didn't find running architecture code (running_arch_code) in arch_array"); 1521 if (running_arch_index == -1) { 1522 // Even though running architecture detection failed 1523 // we may still continue with reporting dlerror() message 1524 return NULL; 1525 } 1526 1527 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1528 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1529 return NULL; 1530 } 1531 1532 #ifndef S390 1533 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1534 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1535 return NULL; 1536 } 1537 #endif // !S390 1538 1539 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1540 if (lib_arch.name!=NULL) { 1541 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1542 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1543 lib_arch.name, arch_array[running_arch_index].name); 1544 } else { 1545 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1546 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1547 lib_arch.code, 1548 arch_array[running_arch_index].name); 1549 } 1550 } 1551 1552 return NULL; 1553 #endif // STATIC_BUILD 1554 } 1555 #endif // !__APPLE__ 1556 1557 void* os::get_default_process_handle() { 1558 #ifdef __APPLE__ 1559 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1560 // to avoid finding unexpected symbols on second (or later) 1561 // loads of a library. 1562 return (void*)::dlopen(NULL, RTLD_FIRST); 1563 #else 1564 return (void*)::dlopen(NULL, RTLD_LAZY); 1565 #endif 1566 } 1567 1568 // XXX: Do we need a lock around this as per Linux? 1569 void* os::dll_lookup(void* handle, const char* name) { 1570 return dlsym(handle, name); 1571 } 1572 1573 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1574 outputStream * out = (outputStream *) param; 1575 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1576 return 0; 1577 } 1578 1579 void os::print_dll_info(outputStream *st) { 1580 st->print_cr("Dynamic libraries:"); 1581 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1582 st->print_cr("Error: Cannot print dynamic libraries."); 1583 } 1584 } 1585 1586 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1587 #ifdef RTLD_DI_LINKMAP 1588 Dl_info dli; 1589 void *handle; 1590 Link_map *map; 1591 Link_map *p; 1592 1593 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1594 dli.dli_fname == NULL) { 1595 return 1; 1596 } 1597 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1598 if (handle == NULL) { 1599 return 1; 1600 } 1601 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1602 if (map == NULL) { 1603 dlclose(handle); 1604 return 1; 1605 } 1606 1607 while (map->l_prev != NULL) 1608 map = map->l_prev; 1609 1610 while (map != NULL) { 1611 // Value for top_address is returned as 0 since we don't have any information about module size 1612 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1613 dlclose(handle); 1614 return 1; 1615 } 1616 map = map->l_next; 1617 } 1618 1619 dlclose(handle); 1620 #elif defined(__APPLE__) 1621 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1622 // Value for top_address is returned as 0 since we don't have any information about module size 1623 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1624 return 1; 1625 } 1626 } 1627 return 0; 1628 #else 1629 return 1; 1630 #endif 1631 } 1632 1633 void os::get_summary_os_info(char* buf, size_t buflen) { 1634 // These buffers are small because we want this to be brief 1635 // and not use a lot of stack while generating the hs_err file. 1636 char os[100]; 1637 size_t size = sizeof(os); 1638 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1639 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1640 #ifdef __APPLE__ 1641 strncpy(os, "Darwin", sizeof(os)); 1642 #elif __OpenBSD__ 1643 strncpy(os, "OpenBSD", sizeof(os)); 1644 #else 1645 strncpy(os, "BSD", sizeof(os)); 1646 #endif 1647 } 1648 1649 char release[100]; 1650 size = sizeof(release); 1651 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1652 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1653 // if error, leave blank 1654 strncpy(release, "", sizeof(release)); 1655 } 1656 snprintf(buf, buflen, "%s %s", os, release); 1657 } 1658 1659 void os::print_os_info_brief(outputStream* st) { 1660 os::Posix::print_uname_info(st); 1661 } 1662 1663 void os::print_os_info(outputStream* st) { 1664 st->print("OS:"); 1665 1666 os::Posix::print_uname_info(st); 1667 1668 os::Posix::print_rlimit_info(st); 1669 1670 os::Posix::print_load_average(st); 1671 } 1672 1673 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1674 // Nothing to do for now. 1675 } 1676 1677 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1678 unsigned int mhz; 1679 size_t size = sizeof(mhz); 1680 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1681 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1682 mhz = 1; // looks like an error but can be divided by 1683 } else { 1684 mhz /= 1000000; // reported in millions 1685 } 1686 1687 char model[100]; 1688 size = sizeof(model); 1689 int mib_model[] = { CTL_HW, HW_MODEL }; 1690 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1691 strncpy(model, cpu_arch, sizeof(model)); 1692 } 1693 1694 char machine[100]; 1695 size = sizeof(machine); 1696 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1697 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1698 strncpy(machine, "", sizeof(machine)); 1699 } 1700 1701 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1702 } 1703 1704 void os::print_memory_info(outputStream* st) { 1705 1706 st->print("Memory:"); 1707 st->print(" %dk page", os::vm_page_size()>>10); 1708 1709 st->print(", physical " UINT64_FORMAT "k", 1710 os::physical_memory() >> 10); 1711 st->print("(" UINT64_FORMAT "k free)", 1712 os::available_memory() >> 10); 1713 st->cr(); 1714 } 1715 1716 static void print_signal_handler(outputStream* st, int sig, 1717 char* buf, size_t buflen); 1718 1719 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1720 st->print_cr("Signal Handlers:"); 1721 print_signal_handler(st, SIGSEGV, buf, buflen); 1722 print_signal_handler(st, SIGBUS , buf, buflen); 1723 print_signal_handler(st, SIGFPE , buf, buflen); 1724 print_signal_handler(st, SIGPIPE, buf, buflen); 1725 print_signal_handler(st, SIGXFSZ, buf, buflen); 1726 print_signal_handler(st, SIGILL , buf, buflen); 1727 print_signal_handler(st, SR_signum, buf, buflen); 1728 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1729 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1730 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1731 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1732 } 1733 1734 static char saved_jvm_path[MAXPATHLEN] = {0}; 1735 1736 // Find the full path to the current module, libjvm 1737 void os::jvm_path(char *buf, jint buflen) { 1738 // Error checking. 1739 if (buflen < MAXPATHLEN) { 1740 assert(false, "must use a large-enough buffer"); 1741 buf[0] = '\0'; 1742 return; 1743 } 1744 // Lazy resolve the path to current module. 1745 if (saved_jvm_path[0] != 0) { 1746 strcpy(buf, saved_jvm_path); 1747 return; 1748 } 1749 1750 char dli_fname[MAXPATHLEN]; 1751 bool ret = dll_address_to_library_name( 1752 CAST_FROM_FN_PTR(address, os::jvm_path), 1753 dli_fname, sizeof(dli_fname), NULL); 1754 assert(ret, "cannot locate libjvm"); 1755 char *rp = NULL; 1756 if (ret && dli_fname[0] != '\0') { 1757 rp = realpath(dli_fname, buf); 1758 } 1759 if (rp == NULL) { 1760 return; 1761 } 1762 1763 if (Arguments::sun_java_launcher_is_altjvm()) { 1764 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1765 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1766 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1767 // appears at the right place in the string, then assume we are 1768 // installed in a JDK and we're done. Otherwise, check for a 1769 // JAVA_HOME environment variable and construct a path to the JVM 1770 // being overridden. 1771 1772 const char *p = buf + strlen(buf) - 1; 1773 for (int count = 0; p > buf && count < 5; ++count) { 1774 for (--p; p > buf && *p != '/'; --p) 1775 /* empty */ ; 1776 } 1777 1778 if (strncmp(p, "/jre/lib/", 9) != 0) { 1779 // Look for JAVA_HOME in the environment. 1780 char* java_home_var = ::getenv("JAVA_HOME"); 1781 if (java_home_var != NULL && java_home_var[0] != 0) { 1782 char* jrelib_p; 1783 int len; 1784 1785 // Check the current module name "libjvm" 1786 p = strrchr(buf, '/'); 1787 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1788 1789 rp = realpath(java_home_var, buf); 1790 if (rp == NULL) { 1791 return; 1792 } 1793 1794 // determine if this is a legacy image or modules image 1795 // modules image doesn't have "jre" subdirectory 1796 len = strlen(buf); 1797 assert(len < buflen, "Ran out of buffer space"); 1798 jrelib_p = buf + len; 1799 1800 // Add the appropriate library subdir 1801 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1802 if (0 != access(buf, F_OK)) { 1803 snprintf(jrelib_p, buflen-len, "/lib"); 1804 } 1805 1806 // Add the appropriate client or server subdir 1807 len = strlen(buf); 1808 jrelib_p = buf + len; 1809 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1810 if (0 != access(buf, F_OK)) { 1811 snprintf(jrelib_p, buflen-len, "%s", ""); 1812 } 1813 1814 // If the path exists within JAVA_HOME, add the JVM library name 1815 // to complete the path to JVM being overridden. Otherwise fallback 1816 // to the path to the current library. 1817 if (0 == access(buf, F_OK)) { 1818 // Use current module name "libjvm" 1819 len = strlen(buf); 1820 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1821 } else { 1822 // Fall back to path of current library 1823 rp = realpath(dli_fname, buf); 1824 if (rp == NULL) { 1825 return; 1826 } 1827 } 1828 } 1829 } 1830 } 1831 1832 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1833 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1834 } 1835 1836 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1837 // no prefix required, not even "_" 1838 } 1839 1840 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1841 // no suffix required 1842 } 1843 1844 //////////////////////////////////////////////////////////////////////////////// 1845 // sun.misc.Signal support 1846 1847 static volatile jint sigint_count = 0; 1848 1849 static void UserHandler(int sig, void *siginfo, void *context) { 1850 // 4511530 - sem_post is serialized and handled by the manager thread. When 1851 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1852 // don't want to flood the manager thread with sem_post requests. 1853 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1854 return; 1855 } 1856 1857 // Ctrl-C is pressed during error reporting, likely because the error 1858 // handler fails to abort. Let VM die immediately. 1859 if (sig == SIGINT && is_error_reported()) { 1860 os::die(); 1861 } 1862 1863 os::signal_notify(sig); 1864 } 1865 1866 void* os::user_handler() { 1867 return CAST_FROM_FN_PTR(void*, UserHandler); 1868 } 1869 1870 extern "C" { 1871 typedef void (*sa_handler_t)(int); 1872 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1873 } 1874 1875 void* os::signal(int signal_number, void* handler) { 1876 struct sigaction sigAct, oldSigAct; 1877 1878 sigfillset(&(sigAct.sa_mask)); 1879 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1880 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1881 1882 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1883 // -1 means registration failed 1884 return (void *)-1; 1885 } 1886 1887 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1888 } 1889 1890 void os::signal_raise(int signal_number) { 1891 ::raise(signal_number); 1892 } 1893 1894 // The following code is moved from os.cpp for making this 1895 // code platform specific, which it is by its very nature. 1896 1897 // Will be modified when max signal is changed to be dynamic 1898 int os::sigexitnum_pd() { 1899 return NSIG; 1900 } 1901 1902 // a counter for each possible signal value 1903 static volatile jint pending_signals[NSIG+1] = { 0 }; 1904 1905 // Bsd(POSIX) specific hand shaking semaphore. 1906 #ifdef __APPLE__ 1907 typedef semaphore_t os_semaphore_t; 1908 1909 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1910 #define SEM_WAIT(sem) semaphore_wait(sem) 1911 #define SEM_POST(sem) semaphore_signal(sem) 1912 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1913 #else 1914 typedef sem_t os_semaphore_t; 1915 1916 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1917 #define SEM_WAIT(sem) sem_wait(&sem) 1918 #define SEM_POST(sem) sem_post(&sem) 1919 #define SEM_DESTROY(sem) sem_destroy(&sem) 1920 #endif 1921 1922 #ifdef __APPLE__ 1923 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. 1924 1925 static const char* sem_init_strerror(kern_return_t value) { 1926 switch (value) { 1927 case KERN_INVALID_ARGUMENT: return "Invalid argument"; 1928 case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; 1929 default: return "Unknown"; 1930 } 1931 } 1932 1933 OSXSemaphore::OSXSemaphore(uint value) { 1934 kern_return_t ret = SEM_INIT(_semaphore, value); 1935 1936 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); 1937 } 1938 1939 OSXSemaphore::~OSXSemaphore() { 1940 SEM_DESTROY(_semaphore); 1941 } 1942 1943 void OSXSemaphore::signal(uint count) { 1944 for (uint i = 0; i < count; i++) { 1945 kern_return_t ret = SEM_POST(_semaphore); 1946 1947 assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); 1948 } 1949 } 1950 1951 void OSXSemaphore::wait() { 1952 kern_return_t ret; 1953 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) { 1954 // Semaphore was interrupted. Retry. 1955 } 1956 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); 1957 } 1958 1959 jlong OSXSemaphore::currenttime() { 1960 struct timeval tv; 1961 gettimeofday(&tv, NULL); 1962 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1963 } 1964 1965 bool OSXSemaphore::trywait() { 1966 return timedwait(0, 0); 1967 } 1968 1969 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { 1970 kern_return_t kr = KERN_ABORTED; 1971 mach_timespec_t waitspec; 1972 waitspec.tv_sec = sec; 1973 waitspec.tv_nsec = nsec; 1974 1975 jlong starttime = currenttime(); 1976 1977 kr = semaphore_timedwait(_semaphore, waitspec); 1978 while (kr == KERN_ABORTED) { 1979 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1980 1981 jlong current = currenttime(); 1982 jlong passedtime = current - starttime; 1983 1984 if (passedtime >= totalwait) { 1985 waitspec.tv_sec = 0; 1986 waitspec.tv_nsec = 0; 1987 } else { 1988 jlong waittime = totalwait - (current - starttime); 1989 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1990 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1991 } 1992 1993 kr = semaphore_timedwait(_semaphore, waitspec); 1994 } 1995 1996 return kr == KERN_SUCCESS; 1997 } 1998 1999 #else 2000 // Use POSIX implementation of semaphores. 2001 2002 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2003 struct timespec ts; 2004 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2005 2006 return ts; 2007 } 2008 2009 #endif // __APPLE__ 2010 2011 static os_semaphore_t sig_sem; 2012 2013 #ifdef __APPLE__ 2014 static OSXSemaphore sr_semaphore; 2015 #else 2016 static PosixSemaphore sr_semaphore; 2017 #endif 2018 2019 void os::signal_init_pd() { 2020 // Initialize signal structures 2021 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2022 2023 // Initialize signal semaphore 2024 ::SEM_INIT(sig_sem, 0); 2025 } 2026 2027 void os::signal_notify(int sig) { 2028 Atomic::inc(&pending_signals[sig]); 2029 ::SEM_POST(sig_sem); 2030 } 2031 2032 static int check_pending_signals(bool wait) { 2033 Atomic::store(0, &sigint_count); 2034 for (;;) { 2035 for (int i = 0; i < NSIG + 1; i++) { 2036 jint n = pending_signals[i]; 2037 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2038 return i; 2039 } 2040 } 2041 if (!wait) { 2042 return -1; 2043 } 2044 JavaThread *thread = JavaThread::current(); 2045 ThreadBlockInVM tbivm(thread); 2046 2047 bool threadIsSuspended; 2048 do { 2049 thread->set_suspend_equivalent(); 2050 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2051 ::SEM_WAIT(sig_sem); 2052 2053 // were we externally suspended while we were waiting? 2054 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2055 if (threadIsSuspended) { 2056 // The semaphore has been incremented, but while we were waiting 2057 // another thread suspended us. We don't want to continue running 2058 // while suspended because that would surprise the thread that 2059 // suspended us. 2060 ::SEM_POST(sig_sem); 2061 2062 thread->java_suspend_self(); 2063 } 2064 } while (threadIsSuspended); 2065 } 2066 } 2067 2068 int os::signal_lookup() { 2069 return check_pending_signals(false); 2070 } 2071 2072 int os::signal_wait() { 2073 return check_pending_signals(true); 2074 } 2075 2076 //////////////////////////////////////////////////////////////////////////////// 2077 // Virtual Memory 2078 2079 int os::vm_page_size() { 2080 // Seems redundant as all get out 2081 assert(os::Bsd::page_size() != -1, "must call os::init"); 2082 return os::Bsd::page_size(); 2083 } 2084 2085 // Solaris allocates memory by pages. 2086 int os::vm_allocation_granularity() { 2087 assert(os::Bsd::page_size() != -1, "must call os::init"); 2088 return os::Bsd::page_size(); 2089 } 2090 2091 // Rationale behind this function: 2092 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2093 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2094 // samples for JITted code. Here we create private executable mapping over the code cache 2095 // and then we can use standard (well, almost, as mapping can change) way to provide 2096 // info for the reporting script by storing timestamp and location of symbol 2097 void bsd_wrap_code(char* base, size_t size) { 2098 static volatile jint cnt = 0; 2099 2100 if (!UseOprofile) { 2101 return; 2102 } 2103 2104 char buf[PATH_MAX + 1]; 2105 int num = Atomic::add(1, &cnt); 2106 2107 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2108 os::get_temp_directory(), os::current_process_id(), num); 2109 unlink(buf); 2110 2111 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2112 2113 if (fd != -1) { 2114 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2115 if (rv != (off_t)-1) { 2116 if (::write(fd, "", 1) == 1) { 2117 mmap(base, size, 2118 PROT_READ|PROT_WRITE|PROT_EXEC, 2119 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2120 } 2121 } 2122 ::close(fd); 2123 unlink(buf); 2124 } 2125 } 2126 2127 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2128 int err) { 2129 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2130 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2131 os::errno_name(err), err); 2132 } 2133 2134 // NOTE: Bsd kernel does not really reserve the pages for us. 2135 // All it does is to check if there are enough free pages 2136 // left at the time of mmap(). This could be a potential 2137 // problem. 2138 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2139 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2140 #ifdef __OpenBSD__ 2141 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2142 if (::mprotect(addr, size, prot) == 0) { 2143 return true; 2144 } 2145 #else 2146 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2147 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2148 if (res != (uintptr_t) MAP_FAILED) { 2149 return true; 2150 } 2151 #endif 2152 2153 // Warn about any commit errors we see in non-product builds just 2154 // in case mmap() doesn't work as described on the man page. 2155 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2156 2157 return false; 2158 } 2159 2160 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2161 bool exec) { 2162 // alignment_hint is ignored on this OS 2163 return pd_commit_memory(addr, size, exec); 2164 } 2165 2166 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2167 const char* mesg) { 2168 assert(mesg != NULL, "mesg must be specified"); 2169 if (!pd_commit_memory(addr, size, exec)) { 2170 // add extra info in product mode for vm_exit_out_of_memory(): 2171 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2172 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2173 } 2174 } 2175 2176 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2177 size_t alignment_hint, bool exec, 2178 const char* mesg) { 2179 // alignment_hint is ignored on this OS 2180 pd_commit_memory_or_exit(addr, size, exec, mesg); 2181 } 2182 2183 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2184 } 2185 2186 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2187 ::madvise(addr, bytes, MADV_DONTNEED); 2188 } 2189 2190 void os::numa_make_global(char *addr, size_t bytes) { 2191 } 2192 2193 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2194 } 2195 2196 bool os::numa_topology_changed() { return false; } 2197 2198 size_t os::numa_get_groups_num() { 2199 return 1; 2200 } 2201 2202 int os::numa_get_group_id() { 2203 return 0; 2204 } 2205 2206 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2207 if (size > 0) { 2208 ids[0] = 0; 2209 return 1; 2210 } 2211 return 0; 2212 } 2213 2214 bool os::get_page_info(char *start, page_info* info) { 2215 return false; 2216 } 2217 2218 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2219 return end; 2220 } 2221 2222 2223 bool os::pd_uncommit_memory(char* addr, size_t size) { 2224 #ifdef __OpenBSD__ 2225 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2226 return ::mprotect(addr, size, PROT_NONE) == 0; 2227 #else 2228 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2229 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2230 return res != (uintptr_t) MAP_FAILED; 2231 #endif 2232 } 2233 2234 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2235 return os::commit_memory(addr, size, !ExecMem); 2236 } 2237 2238 // If this is a growable mapping, remove the guard pages entirely by 2239 // munmap()ping them. If not, just call uncommit_memory(). 2240 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2241 return os::uncommit_memory(addr, size); 2242 } 2243 2244 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2245 // at 'requested_addr'. If there are existing memory mappings at the same 2246 // location, however, they will be overwritten. If 'fixed' is false, 2247 // 'requested_addr' is only treated as a hint, the return value may or 2248 // may not start from the requested address. Unlike Bsd mmap(), this 2249 // function returns NULL to indicate failure. 2250 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2251 char * addr; 2252 int flags; 2253 2254 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2255 if (fixed) { 2256 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2257 flags |= MAP_FIXED; 2258 } 2259 2260 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2261 // touch an uncommitted page. Otherwise, the read/write might 2262 // succeed if we have enough swap space to back the physical page. 2263 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2264 flags, -1, 0); 2265 2266 return addr == MAP_FAILED ? NULL : addr; 2267 } 2268 2269 static int anon_munmap(char * addr, size_t size) { 2270 return ::munmap(addr, size) == 0; 2271 } 2272 2273 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2274 size_t alignment_hint) { 2275 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2276 } 2277 2278 bool os::pd_release_memory(char* addr, size_t size) { 2279 return anon_munmap(addr, size); 2280 } 2281 2282 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2283 // Bsd wants the mprotect address argument to be page aligned. 2284 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2285 2286 // According to SUSv3, mprotect() should only be used with mappings 2287 // established by mmap(), and mmap() always maps whole pages. Unaligned 2288 // 'addr' likely indicates problem in the VM (e.g. trying to change 2289 // protection of malloc'ed or statically allocated memory). Check the 2290 // caller if you hit this assert. 2291 assert(addr == bottom, "sanity check"); 2292 2293 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2294 return ::mprotect(bottom, size, prot) == 0; 2295 } 2296 2297 // Set protections specified 2298 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2299 bool is_committed) { 2300 unsigned int p = 0; 2301 switch (prot) { 2302 case MEM_PROT_NONE: p = PROT_NONE; break; 2303 case MEM_PROT_READ: p = PROT_READ; break; 2304 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2305 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2306 default: 2307 ShouldNotReachHere(); 2308 } 2309 // is_committed is unused. 2310 return bsd_mprotect(addr, bytes, p); 2311 } 2312 2313 bool os::guard_memory(char* addr, size_t size) { 2314 return bsd_mprotect(addr, size, PROT_NONE); 2315 } 2316 2317 bool os::unguard_memory(char* addr, size_t size) { 2318 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2319 } 2320 2321 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2322 return false; 2323 } 2324 2325 // Large page support 2326 2327 static size_t _large_page_size = 0; 2328 2329 void os::large_page_init() { 2330 } 2331 2332 2333 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2334 fatal("This code is not used or maintained."); 2335 2336 // "exec" is passed in but not used. Creating the shared image for 2337 // the code cache doesn't have an SHM_X executable permission to check. 2338 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2339 2340 key_t key = IPC_PRIVATE; 2341 char *addr; 2342 2343 bool warn_on_failure = UseLargePages && 2344 (!FLAG_IS_DEFAULT(UseLargePages) || 2345 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2346 2347 // Create a large shared memory region to attach to based on size. 2348 // Currently, size is the total size of the heap 2349 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2350 if (shmid == -1) { 2351 // Possible reasons for shmget failure: 2352 // 1. shmmax is too small for Java heap. 2353 // > check shmmax value: cat /proc/sys/kernel/shmmax 2354 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2355 // 2. not enough large page memory. 2356 // > check available large pages: cat /proc/meminfo 2357 // > increase amount of large pages: 2358 // echo new_value > /proc/sys/vm/nr_hugepages 2359 // Note 1: different Bsd may use different name for this property, 2360 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2361 // Note 2: it's possible there's enough physical memory available but 2362 // they are so fragmented after a long run that they can't 2363 // coalesce into large pages. Try to reserve large pages when 2364 // the system is still "fresh". 2365 if (warn_on_failure) { 2366 warning("Failed to reserve shared memory (errno = %d).", errno); 2367 } 2368 return NULL; 2369 } 2370 2371 // attach to the region 2372 addr = (char*)shmat(shmid, req_addr, 0); 2373 int err = errno; 2374 2375 // Remove shmid. If shmat() is successful, the actual shared memory segment 2376 // will be deleted when it's detached by shmdt() or when the process 2377 // terminates. If shmat() is not successful this will remove the shared 2378 // segment immediately. 2379 shmctl(shmid, IPC_RMID, NULL); 2380 2381 if ((intptr_t)addr == -1) { 2382 if (warn_on_failure) { 2383 warning("Failed to attach shared memory (errno = %d).", err); 2384 } 2385 return NULL; 2386 } 2387 2388 // The memory is committed 2389 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2390 2391 return addr; 2392 } 2393 2394 bool os::release_memory_special(char* base, size_t bytes) { 2395 if (MemTracker::tracking_level() > NMT_minimal) { 2396 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2397 // detaching the SHM segment will also delete it, see reserve_memory_special() 2398 int rslt = shmdt(base); 2399 if (rslt == 0) { 2400 tkr.record((address)base, bytes); 2401 return true; 2402 } else { 2403 return false; 2404 } 2405 } else { 2406 return shmdt(base) == 0; 2407 } 2408 } 2409 2410 size_t os::large_page_size() { 2411 return _large_page_size; 2412 } 2413 2414 // HugeTLBFS allows application to commit large page memory on demand; 2415 // with SysV SHM the entire memory region must be allocated as shared 2416 // memory. 2417 bool os::can_commit_large_page_memory() { 2418 return UseHugeTLBFS; 2419 } 2420 2421 bool os::can_execute_large_page_memory() { 2422 return UseHugeTLBFS; 2423 } 2424 2425 // Reserve memory at an arbitrary address, only if that area is 2426 // available (and not reserved for something else). 2427 2428 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2429 const int max_tries = 10; 2430 char* base[max_tries]; 2431 size_t size[max_tries]; 2432 const size_t gap = 0x000000; 2433 2434 // Assert only that the size is a multiple of the page size, since 2435 // that's all that mmap requires, and since that's all we really know 2436 // about at this low abstraction level. If we need higher alignment, 2437 // we can either pass an alignment to this method or verify alignment 2438 // in one of the methods further up the call chain. See bug 5044738. 2439 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2440 2441 // Repeatedly allocate blocks until the block is allocated at the 2442 // right spot. 2443 2444 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2445 // if kernel honors the hint then we can return immediately. 2446 char * addr = anon_mmap(requested_addr, bytes, false); 2447 if (addr == requested_addr) { 2448 return requested_addr; 2449 } 2450 2451 if (addr != NULL) { 2452 // mmap() is successful but it fails to reserve at the requested address 2453 anon_munmap(addr, bytes); 2454 } 2455 2456 int i; 2457 for (i = 0; i < max_tries; ++i) { 2458 base[i] = reserve_memory(bytes); 2459 2460 if (base[i] != NULL) { 2461 // Is this the block we wanted? 2462 if (base[i] == requested_addr) { 2463 size[i] = bytes; 2464 break; 2465 } 2466 2467 // Does this overlap the block we wanted? Give back the overlapped 2468 // parts and try again. 2469 2470 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2471 if (top_overlap >= 0 && top_overlap < bytes) { 2472 unmap_memory(base[i], top_overlap); 2473 base[i] += top_overlap; 2474 size[i] = bytes - top_overlap; 2475 } else { 2476 size_t bottom_overlap = base[i] + bytes - requested_addr; 2477 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2478 unmap_memory(requested_addr, bottom_overlap); 2479 size[i] = bytes - bottom_overlap; 2480 } else { 2481 size[i] = bytes; 2482 } 2483 } 2484 } 2485 } 2486 2487 // Give back the unused reserved pieces. 2488 2489 for (int j = 0; j < i; ++j) { 2490 if (base[j] != NULL) { 2491 unmap_memory(base[j], size[j]); 2492 } 2493 } 2494 2495 if (i < max_tries) { 2496 return requested_addr; 2497 } else { 2498 return NULL; 2499 } 2500 } 2501 2502 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2503 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2504 } 2505 2506 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2507 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2508 } 2509 2510 void os::naked_short_sleep(jlong ms) { 2511 struct timespec req; 2512 2513 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2514 req.tv_sec = 0; 2515 if (ms > 0) { 2516 req.tv_nsec = (ms % 1000) * 1000000; 2517 } else { 2518 req.tv_nsec = 1; 2519 } 2520 2521 nanosleep(&req, NULL); 2522 2523 return; 2524 } 2525 2526 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2527 void os::infinite_sleep() { 2528 while (true) { // sleep forever ... 2529 ::sleep(100); // ... 100 seconds at a time 2530 } 2531 } 2532 2533 // Used to convert frequent JVM_Yield() to nops 2534 bool os::dont_yield() { 2535 return DontYieldALot; 2536 } 2537 2538 void os::naked_yield() { 2539 sched_yield(); 2540 } 2541 2542 //////////////////////////////////////////////////////////////////////////////// 2543 // thread priority support 2544 2545 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2546 // only supports dynamic priority, static priority must be zero. For real-time 2547 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2548 // However, for large multi-threaded applications, SCHED_RR is not only slower 2549 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2550 // of 5 runs - Sep 2005). 2551 // 2552 // The following code actually changes the niceness of kernel-thread/LWP. It 2553 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2554 // not the entire user process, and user level threads are 1:1 mapped to kernel 2555 // threads. It has always been the case, but could change in the future. For 2556 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2557 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2558 2559 #if !defined(__APPLE__) 2560 int os::java_to_os_priority[CriticalPriority + 1] = { 2561 19, // 0 Entry should never be used 2562 2563 0, // 1 MinPriority 2564 3, // 2 2565 6, // 3 2566 2567 10, // 4 2568 15, // 5 NormPriority 2569 18, // 6 2570 2571 21, // 7 2572 25, // 8 2573 28, // 9 NearMaxPriority 2574 2575 31, // 10 MaxPriority 2576 2577 31 // 11 CriticalPriority 2578 }; 2579 #else 2580 // Using Mach high-level priority assignments 2581 int os::java_to_os_priority[CriticalPriority + 1] = { 2582 0, // 0 Entry should never be used (MINPRI_USER) 2583 2584 27, // 1 MinPriority 2585 28, // 2 2586 29, // 3 2587 2588 30, // 4 2589 31, // 5 NormPriority (BASEPRI_DEFAULT) 2590 32, // 6 2591 2592 33, // 7 2593 34, // 8 2594 35, // 9 NearMaxPriority 2595 2596 36, // 10 MaxPriority 2597 2598 36 // 11 CriticalPriority 2599 }; 2600 #endif 2601 2602 static int prio_init() { 2603 if (ThreadPriorityPolicy == 1) { 2604 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2605 // if effective uid is not root. Perhaps, a more elegant way of doing 2606 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2607 if (geteuid() != 0) { 2608 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2609 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2610 } 2611 ThreadPriorityPolicy = 0; 2612 } 2613 } 2614 if (UseCriticalJavaThreadPriority) { 2615 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2616 } 2617 return 0; 2618 } 2619 2620 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2621 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2622 2623 #ifdef __OpenBSD__ 2624 // OpenBSD pthread_setprio starves low priority threads 2625 return OS_OK; 2626 #elif defined(__FreeBSD__) 2627 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2628 #elif defined(__APPLE__) || defined(__NetBSD__) 2629 struct sched_param sp; 2630 int policy; 2631 pthread_t self = pthread_self(); 2632 2633 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2634 return OS_ERR; 2635 } 2636 2637 sp.sched_priority = newpri; 2638 if (pthread_setschedparam(self, policy, &sp) != 0) { 2639 return OS_ERR; 2640 } 2641 2642 return OS_OK; 2643 #else 2644 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2645 return (ret == 0) ? OS_OK : OS_ERR; 2646 #endif 2647 } 2648 2649 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2650 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2651 *priority_ptr = java_to_os_priority[NormPriority]; 2652 return OS_OK; 2653 } 2654 2655 errno = 0; 2656 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2657 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2658 #elif defined(__APPLE__) || defined(__NetBSD__) 2659 int policy; 2660 struct sched_param sp; 2661 2662 pthread_getschedparam(pthread_self(), &policy, &sp); 2663 *priority_ptr = sp.sched_priority; 2664 #else 2665 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2666 #endif 2667 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2668 } 2669 2670 // Hint to the underlying OS that a task switch would not be good. 2671 // Void return because it's a hint and can fail. 2672 void os::hint_no_preempt() {} 2673 2674 //////////////////////////////////////////////////////////////////////////////// 2675 // suspend/resume support 2676 2677 // the low-level signal-based suspend/resume support is a remnant from the 2678 // old VM-suspension that used to be for java-suspension, safepoints etc, 2679 // within hotspot. Now there is a single use-case for this: 2680 // - calling get_thread_pc() on the VMThread by the flat-profiler task 2681 // that runs in the watcher thread. 2682 // The remaining code is greatly simplified from the more general suspension 2683 // code that used to be used. 2684 // 2685 // The protocol is quite simple: 2686 // - suspend: 2687 // - sends a signal to the target thread 2688 // - polls the suspend state of the osthread using a yield loop 2689 // - target thread signal handler (SR_handler) sets suspend state 2690 // and blocks in sigsuspend until continued 2691 // - resume: 2692 // - sets target osthread state to continue 2693 // - sends signal to end the sigsuspend loop in the SR_handler 2694 // 2695 // Note that the SR_lock plays no role in this suspend/resume protocol, 2696 // but is checked for NULL in SR_handler as a thread termination indicator. 2697 2698 static void resume_clear_context(OSThread *osthread) { 2699 osthread->set_ucontext(NULL); 2700 osthread->set_siginfo(NULL); 2701 } 2702 2703 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2704 osthread->set_ucontext(context); 2705 osthread->set_siginfo(siginfo); 2706 } 2707 2708 // Handler function invoked when a thread's execution is suspended or 2709 // resumed. We have to be careful that only async-safe functions are 2710 // called here (Note: most pthread functions are not async safe and 2711 // should be avoided.) 2712 // 2713 // Note: sigwait() is a more natural fit than sigsuspend() from an 2714 // interface point of view, but sigwait() prevents the signal hander 2715 // from being run. libpthread would get very confused by not having 2716 // its signal handlers run and prevents sigwait()'s use with the 2717 // mutex granting granting signal. 2718 // 2719 // Currently only ever called on the VMThread or JavaThread 2720 // 2721 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2722 // Save and restore errno to avoid confusing native code with EINTR 2723 // after sigsuspend. 2724 int old_errno = errno; 2725 2726 Thread* thread = Thread::current_or_null_safe(); 2727 assert(thread != NULL, "Missing current thread in SR_handler"); 2728 2729 // On some systems we have seen signal delivery get "stuck" until the signal 2730 // mask is changed as part of thread termination. Check that the current thread 2731 // has not already terminated (via SR_lock()) - else the following assertion 2732 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2733 // destructor has completed. 2734 2735 if (thread->SR_lock() == NULL) { 2736 return; 2737 } 2738 2739 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2740 2741 OSThread* osthread = thread->osthread(); 2742 2743 os::SuspendResume::State current = osthread->sr.state(); 2744 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2745 suspend_save_context(osthread, siginfo, context); 2746 2747 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2748 os::SuspendResume::State state = osthread->sr.suspended(); 2749 if (state == os::SuspendResume::SR_SUSPENDED) { 2750 sigset_t suspend_set; // signals for sigsuspend() 2751 2752 // get current set of blocked signals and unblock resume signal 2753 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2754 sigdelset(&suspend_set, SR_signum); 2755 2756 sr_semaphore.signal(); 2757 // wait here until we are resumed 2758 while (1) { 2759 sigsuspend(&suspend_set); 2760 2761 os::SuspendResume::State result = osthread->sr.running(); 2762 if (result == os::SuspendResume::SR_RUNNING) { 2763 sr_semaphore.signal(); 2764 break; 2765 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2766 ShouldNotReachHere(); 2767 } 2768 } 2769 2770 } else if (state == os::SuspendResume::SR_RUNNING) { 2771 // request was cancelled, continue 2772 } else { 2773 ShouldNotReachHere(); 2774 } 2775 2776 resume_clear_context(osthread); 2777 } else if (current == os::SuspendResume::SR_RUNNING) { 2778 // request was cancelled, continue 2779 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2780 // ignore 2781 } else { 2782 // ignore 2783 } 2784 2785 errno = old_errno; 2786 } 2787 2788 2789 static int SR_initialize() { 2790 struct sigaction act; 2791 char *s; 2792 // Get signal number to use for suspend/resume 2793 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2794 int sig = ::strtol(s, 0, 10); 2795 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2796 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2797 SR_signum = sig; 2798 } else { 2799 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2800 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2801 } 2802 } 2803 2804 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2805 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2806 2807 sigemptyset(&SR_sigset); 2808 sigaddset(&SR_sigset, SR_signum); 2809 2810 // Set up signal handler for suspend/resume 2811 act.sa_flags = SA_RESTART|SA_SIGINFO; 2812 act.sa_handler = (void (*)(int)) SR_handler; 2813 2814 // SR_signum is blocked by default. 2815 // 4528190 - We also need to block pthread restart signal (32 on all 2816 // supported Bsd platforms). Note that BsdThreads need to block 2817 // this signal for all threads to work properly. So we don't have 2818 // to use hard-coded signal number when setting up the mask. 2819 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2820 2821 if (sigaction(SR_signum, &act, 0) == -1) { 2822 return -1; 2823 } 2824 2825 // Save signal flag 2826 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2827 return 0; 2828 } 2829 2830 static int sr_notify(OSThread* osthread) { 2831 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2832 assert_status(status == 0, status, "pthread_kill"); 2833 return status; 2834 } 2835 2836 // "Randomly" selected value for how long we want to spin 2837 // before bailing out on suspending a thread, also how often 2838 // we send a signal to a thread we want to resume 2839 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2840 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2841 2842 // returns true on success and false on error - really an error is fatal 2843 // but this seems the normal response to library errors 2844 static bool do_suspend(OSThread* osthread) { 2845 assert(osthread->sr.is_running(), "thread should be running"); 2846 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2847 2848 // mark as suspended and send signal 2849 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2850 // failed to switch, state wasn't running? 2851 ShouldNotReachHere(); 2852 return false; 2853 } 2854 2855 if (sr_notify(osthread) != 0) { 2856 ShouldNotReachHere(); 2857 } 2858 2859 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2860 while (true) { 2861 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2862 break; 2863 } else { 2864 // timeout 2865 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2866 if (cancelled == os::SuspendResume::SR_RUNNING) { 2867 return false; 2868 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2869 // make sure that we consume the signal on the semaphore as well 2870 sr_semaphore.wait(); 2871 break; 2872 } else { 2873 ShouldNotReachHere(); 2874 return false; 2875 } 2876 } 2877 } 2878 2879 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2880 return true; 2881 } 2882 2883 static void do_resume(OSThread* osthread) { 2884 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2885 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2886 2887 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2888 // failed to switch to WAKEUP_REQUEST 2889 ShouldNotReachHere(); 2890 return; 2891 } 2892 2893 while (true) { 2894 if (sr_notify(osthread) == 0) { 2895 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2896 if (osthread->sr.is_running()) { 2897 return; 2898 } 2899 } 2900 } else { 2901 ShouldNotReachHere(); 2902 } 2903 } 2904 2905 guarantee(osthread->sr.is_running(), "Must be running!"); 2906 } 2907 2908 /////////////////////////////////////////////////////////////////////////////////// 2909 // signal handling (except suspend/resume) 2910 2911 // This routine may be used by user applications as a "hook" to catch signals. 2912 // The user-defined signal handler must pass unrecognized signals to this 2913 // routine, and if it returns true (non-zero), then the signal handler must 2914 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2915 // routine will never retun false (zero), but instead will execute a VM panic 2916 // routine kill the process. 2917 // 2918 // If this routine returns false, it is OK to call it again. This allows 2919 // the user-defined signal handler to perform checks either before or after 2920 // the VM performs its own checks. Naturally, the user code would be making 2921 // a serious error if it tried to handle an exception (such as a null check 2922 // or breakpoint) that the VM was generating for its own correct operation. 2923 // 2924 // This routine may recognize any of the following kinds of signals: 2925 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2926 // It should be consulted by handlers for any of those signals. 2927 // 2928 // The caller of this routine must pass in the three arguments supplied 2929 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2930 // field of the structure passed to sigaction(). This routine assumes that 2931 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2932 // 2933 // Note that the VM will print warnings if it detects conflicting signal 2934 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2935 // 2936 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2937 void* ucontext, 2938 int abort_if_unrecognized); 2939 2940 void signalHandler(int sig, siginfo_t* info, void* uc) { 2941 assert(info != NULL && uc != NULL, "it must be old kernel"); 2942 int orig_errno = errno; // Preserve errno value over signal handler. 2943 JVM_handle_bsd_signal(sig, info, uc, true); 2944 errno = orig_errno; 2945 } 2946 2947 2948 // This boolean allows users to forward their own non-matching signals 2949 // to JVM_handle_bsd_signal, harmlessly. 2950 bool os::Bsd::signal_handlers_are_installed = false; 2951 2952 // For signal-chaining 2953 struct sigaction sigact[NSIG]; 2954 uint32_t sigs = 0; 2955 #if (32 < NSIG-1) 2956 #error "Not all signals can be encoded in sigs. Adapt its type!" 2957 #endif 2958 bool os::Bsd::libjsig_is_loaded = false; 2959 typedef struct sigaction *(*get_signal_t)(int); 2960 get_signal_t os::Bsd::get_signal_action = NULL; 2961 2962 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2963 struct sigaction *actp = NULL; 2964 2965 if (libjsig_is_loaded) { 2966 // Retrieve the old signal handler from libjsig 2967 actp = (*get_signal_action)(sig); 2968 } 2969 if (actp == NULL) { 2970 // Retrieve the preinstalled signal handler from jvm 2971 actp = get_preinstalled_handler(sig); 2972 } 2973 2974 return actp; 2975 } 2976 2977 static bool call_chained_handler(struct sigaction *actp, int sig, 2978 siginfo_t *siginfo, void *context) { 2979 // Call the old signal handler 2980 if (actp->sa_handler == SIG_DFL) { 2981 // It's more reasonable to let jvm treat it as an unexpected exception 2982 // instead of taking the default action. 2983 return false; 2984 } else if (actp->sa_handler != SIG_IGN) { 2985 if ((actp->sa_flags & SA_NODEFER) == 0) { 2986 // automaticlly block the signal 2987 sigaddset(&(actp->sa_mask), sig); 2988 } 2989 2990 sa_handler_t hand; 2991 sa_sigaction_t sa; 2992 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2993 // retrieve the chained handler 2994 if (siginfo_flag_set) { 2995 sa = actp->sa_sigaction; 2996 } else { 2997 hand = actp->sa_handler; 2998 } 2999 3000 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3001 actp->sa_handler = SIG_DFL; 3002 } 3003 3004 // try to honor the signal mask 3005 sigset_t oset; 3006 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3007 3008 // call into the chained handler 3009 if (siginfo_flag_set) { 3010 (*sa)(sig, siginfo, context); 3011 } else { 3012 (*hand)(sig); 3013 } 3014 3015 // restore the signal mask 3016 pthread_sigmask(SIG_SETMASK, &oset, 0); 3017 } 3018 // Tell jvm's signal handler the signal is taken care of. 3019 return true; 3020 } 3021 3022 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3023 bool chained = false; 3024 // signal-chaining 3025 if (UseSignalChaining) { 3026 struct sigaction *actp = get_chained_signal_action(sig); 3027 if (actp != NULL) { 3028 chained = call_chained_handler(actp, sig, siginfo, context); 3029 } 3030 } 3031 return chained; 3032 } 3033 3034 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3035 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 3036 return &sigact[sig]; 3037 } 3038 return NULL; 3039 } 3040 3041 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3042 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3043 sigact[sig] = oldAct; 3044 sigs |= (uint32_t)1 << (sig-1); 3045 } 3046 3047 // for diagnostic 3048 int sigflags[NSIG]; 3049 3050 int os::Bsd::get_our_sigflags(int sig) { 3051 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3052 return sigflags[sig]; 3053 } 3054 3055 void os::Bsd::set_our_sigflags(int sig, int flags) { 3056 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3057 if (sig > 0 && sig < NSIG) { 3058 sigflags[sig] = flags; 3059 } 3060 } 3061 3062 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3063 // Check for overwrite. 3064 struct sigaction oldAct; 3065 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3066 3067 void* oldhand = oldAct.sa_sigaction 3068 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3069 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3070 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3071 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3072 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3073 if (AllowUserSignalHandlers || !set_installed) { 3074 // Do not overwrite; user takes responsibility to forward to us. 3075 return; 3076 } else if (UseSignalChaining) { 3077 // save the old handler in jvm 3078 save_preinstalled_handler(sig, oldAct); 3079 // libjsig also interposes the sigaction() call below and saves the 3080 // old sigaction on it own. 3081 } else { 3082 fatal("Encountered unexpected pre-existing sigaction handler " 3083 "%#lx for signal %d.", (long)oldhand, sig); 3084 } 3085 } 3086 3087 struct sigaction sigAct; 3088 sigfillset(&(sigAct.sa_mask)); 3089 sigAct.sa_handler = SIG_DFL; 3090 if (!set_installed) { 3091 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3092 } else { 3093 sigAct.sa_sigaction = signalHandler; 3094 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3095 } 3096 #ifdef __APPLE__ 3097 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3098 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3099 // if the signal handler declares it will handle it on alternate stack. 3100 // Notice we only declare we will handle it on alt stack, but we are not 3101 // actually going to use real alt stack - this is just a workaround. 3102 // Please see ux_exception.c, method catch_mach_exception_raise for details 3103 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3104 if (sig == SIGSEGV) { 3105 sigAct.sa_flags |= SA_ONSTACK; 3106 } 3107 #endif 3108 3109 // Save flags, which are set by ours 3110 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3111 sigflags[sig] = sigAct.sa_flags; 3112 3113 int ret = sigaction(sig, &sigAct, &oldAct); 3114 assert(ret == 0, "check"); 3115 3116 void* oldhand2 = oldAct.sa_sigaction 3117 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3118 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3119 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3120 } 3121 3122 // install signal handlers for signals that HotSpot needs to 3123 // handle in order to support Java-level exception handling. 3124 3125 void os::Bsd::install_signal_handlers() { 3126 if (!signal_handlers_are_installed) { 3127 signal_handlers_are_installed = true; 3128 3129 // signal-chaining 3130 typedef void (*signal_setting_t)(); 3131 signal_setting_t begin_signal_setting = NULL; 3132 signal_setting_t end_signal_setting = NULL; 3133 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3134 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3135 if (begin_signal_setting != NULL) { 3136 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3137 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3138 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3139 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3140 libjsig_is_loaded = true; 3141 assert(UseSignalChaining, "should enable signal-chaining"); 3142 } 3143 if (libjsig_is_loaded) { 3144 // Tell libjsig jvm is setting signal handlers 3145 (*begin_signal_setting)(); 3146 } 3147 3148 set_signal_handler(SIGSEGV, true); 3149 set_signal_handler(SIGPIPE, true); 3150 set_signal_handler(SIGBUS, true); 3151 set_signal_handler(SIGILL, true); 3152 set_signal_handler(SIGFPE, true); 3153 set_signal_handler(SIGXFSZ, true); 3154 3155 #if defined(__APPLE__) 3156 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3157 // signals caught and handled by the JVM. To work around this, we reset the mach task 3158 // signal handler that's placed on our process by CrashReporter. This disables 3159 // CrashReporter-based reporting. 3160 // 3161 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3162 // on caught fatal signals. 3163 // 3164 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3165 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3166 // exception handling, while leaving the standard BSD signal handlers functional. 3167 kern_return_t kr; 3168 kr = task_set_exception_ports(mach_task_self(), 3169 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3170 MACH_PORT_NULL, 3171 EXCEPTION_STATE_IDENTITY, 3172 MACHINE_THREAD_STATE); 3173 3174 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3175 #endif 3176 3177 if (libjsig_is_loaded) { 3178 // Tell libjsig jvm finishes setting signal handlers 3179 (*end_signal_setting)(); 3180 } 3181 3182 // We don't activate signal checker if libjsig is in place, we trust ourselves 3183 // and if UserSignalHandler is installed all bets are off 3184 if (CheckJNICalls) { 3185 if (libjsig_is_loaded) { 3186 if (PrintJNIResolving) { 3187 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3188 } 3189 check_signals = false; 3190 } 3191 if (AllowUserSignalHandlers) { 3192 if (PrintJNIResolving) { 3193 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3194 } 3195 check_signals = false; 3196 } 3197 } 3198 } 3199 } 3200 3201 3202 ///// 3203 // glibc on Bsd platform uses non-documented flag 3204 // to indicate, that some special sort of signal 3205 // trampoline is used. 3206 // We will never set this flag, and we should 3207 // ignore this flag in our diagnostic 3208 #ifdef SIGNIFICANT_SIGNAL_MASK 3209 #undef SIGNIFICANT_SIGNAL_MASK 3210 #endif 3211 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3212 3213 static const char* get_signal_handler_name(address handler, 3214 char* buf, int buflen) { 3215 int offset; 3216 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3217 if (found) { 3218 // skip directory names 3219 const char *p1, *p2; 3220 p1 = buf; 3221 size_t len = strlen(os::file_separator()); 3222 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3223 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3224 } else { 3225 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3226 } 3227 return buf; 3228 } 3229 3230 static void print_signal_handler(outputStream* st, int sig, 3231 char* buf, size_t buflen) { 3232 struct sigaction sa; 3233 3234 sigaction(sig, NULL, &sa); 3235 3236 // See comment for SIGNIFICANT_SIGNAL_MASK define 3237 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3238 3239 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3240 3241 address handler = (sa.sa_flags & SA_SIGINFO) 3242 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3243 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3244 3245 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3246 st->print("SIG_DFL"); 3247 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3248 st->print("SIG_IGN"); 3249 } else { 3250 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3251 } 3252 3253 st->print(", sa_mask[0]="); 3254 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3255 3256 address rh = VMError::get_resetted_sighandler(sig); 3257 // May be, handler was resetted by VMError? 3258 if (rh != NULL) { 3259 handler = rh; 3260 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3261 } 3262 3263 st->print(", sa_flags="); 3264 os::Posix::print_sa_flags(st, sa.sa_flags); 3265 3266 // Check: is it our handler? 3267 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3268 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3269 // It is our signal handler 3270 // check for flags, reset system-used one! 3271 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3272 st->print( 3273 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3274 os::Bsd::get_our_sigflags(sig)); 3275 } 3276 } 3277 st->cr(); 3278 } 3279 3280 3281 #define DO_SIGNAL_CHECK(sig) \ 3282 do { \ 3283 if (!sigismember(&check_signal_done, sig)) { \ 3284 os::Bsd::check_signal_handler(sig); \ 3285 } \ 3286 } while (0) 3287 3288 // This method is a periodic task to check for misbehaving JNI applications 3289 // under CheckJNI, we can add any periodic checks here 3290 3291 void os::run_periodic_checks() { 3292 3293 if (check_signals == false) return; 3294 3295 // SEGV and BUS if overridden could potentially prevent 3296 // generation of hs*.log in the event of a crash, debugging 3297 // such a case can be very challenging, so we absolutely 3298 // check the following for a good measure: 3299 DO_SIGNAL_CHECK(SIGSEGV); 3300 DO_SIGNAL_CHECK(SIGILL); 3301 DO_SIGNAL_CHECK(SIGFPE); 3302 DO_SIGNAL_CHECK(SIGBUS); 3303 DO_SIGNAL_CHECK(SIGPIPE); 3304 DO_SIGNAL_CHECK(SIGXFSZ); 3305 3306 3307 // ReduceSignalUsage allows the user to override these handlers 3308 // see comments at the very top and jvm_solaris.h 3309 if (!ReduceSignalUsage) { 3310 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3311 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3312 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3313 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3314 } 3315 3316 DO_SIGNAL_CHECK(SR_signum); 3317 } 3318 3319 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3320 3321 static os_sigaction_t os_sigaction = NULL; 3322 3323 void os::Bsd::check_signal_handler(int sig) { 3324 char buf[O_BUFLEN]; 3325 address jvmHandler = NULL; 3326 3327 3328 struct sigaction act; 3329 if (os_sigaction == NULL) { 3330 // only trust the default sigaction, in case it has been interposed 3331 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3332 if (os_sigaction == NULL) return; 3333 } 3334 3335 os_sigaction(sig, (struct sigaction*)NULL, &act); 3336 3337 3338 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3339 3340 address thisHandler = (act.sa_flags & SA_SIGINFO) 3341 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3342 : CAST_FROM_FN_PTR(address, act.sa_handler); 3343 3344 3345 switch (sig) { 3346 case SIGSEGV: 3347 case SIGBUS: 3348 case SIGFPE: 3349 case SIGPIPE: 3350 case SIGILL: 3351 case SIGXFSZ: 3352 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3353 break; 3354 3355 case SHUTDOWN1_SIGNAL: 3356 case SHUTDOWN2_SIGNAL: 3357 case SHUTDOWN3_SIGNAL: 3358 case BREAK_SIGNAL: 3359 jvmHandler = (address)user_handler(); 3360 break; 3361 3362 default: 3363 if (sig == SR_signum) { 3364 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3365 } else { 3366 return; 3367 } 3368 break; 3369 } 3370 3371 if (thisHandler != jvmHandler) { 3372 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3373 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3374 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3375 // No need to check this sig any longer 3376 sigaddset(&check_signal_done, sig); 3377 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3378 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3379 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3380 exception_name(sig, buf, O_BUFLEN)); 3381 } 3382 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3383 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3384 tty->print("expected:"); 3385 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3386 tty->cr(); 3387 tty->print(" found:"); 3388 os::Posix::print_sa_flags(tty, act.sa_flags); 3389 tty->cr(); 3390 // No need to check this sig any longer 3391 sigaddset(&check_signal_done, sig); 3392 } 3393 3394 // Dump all the signal 3395 if (sigismember(&check_signal_done, sig)) { 3396 print_signal_handlers(tty, buf, O_BUFLEN); 3397 } 3398 } 3399 3400 extern void report_error(char* file_name, int line_no, char* title, 3401 char* format, ...); 3402 3403 // this is called _before_ the most of global arguments have been parsed 3404 void os::init(void) { 3405 char dummy; // used to get a guess on initial stack address 3406 // first_hrtime = gethrtime(); 3407 3408 // With BsdThreads the JavaMain thread pid (primordial thread) 3409 // is different than the pid of the java launcher thread. 3410 // So, on Bsd, the launcher thread pid is passed to the VM 3411 // via the sun.java.launcher.pid property. 3412 // Use this property instead of getpid() if it was correctly passed. 3413 // See bug 6351349. 3414 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3415 3416 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3417 3418 clock_tics_per_sec = CLK_TCK; 3419 3420 init_random(1234567); 3421 3422 ThreadCritical::initialize(); 3423 3424 Bsd::set_page_size(getpagesize()); 3425 if (Bsd::page_size() == -1) { 3426 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3427 } 3428 init_page_sizes((size_t) Bsd::page_size()); 3429 3430 Bsd::initialize_system_info(); 3431 3432 // main_thread points to the aboriginal thread 3433 Bsd::_main_thread = pthread_self(); 3434 3435 Bsd::clock_init(); 3436 initial_time_count = javaTimeNanos(); 3437 3438 #ifdef __APPLE__ 3439 // XXXDARWIN 3440 // Work around the unaligned VM callbacks in hotspot's 3441 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3442 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3443 // alignment when doing symbol lookup. To work around this, we force early 3444 // binding of all symbols now, thus binding when alignment is known-good. 3445 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3446 #endif 3447 } 3448 3449 // To install functions for atexit system call 3450 extern "C" { 3451 static void perfMemory_exit_helper() { 3452 perfMemory_exit(); 3453 } 3454 } 3455 3456 // this is called _after_ the global arguments have been parsed 3457 jint os::init_2(void) { 3458 // Allocate a single page and mark it as readable for safepoint polling 3459 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3460 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page"); 3461 3462 os::set_polling_page(polling_page); 3463 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 3464 3465 if (!UseMembar) { 3466 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3467 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3468 os::set_memory_serialize_page(mem_serialize_page); 3469 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 3470 } 3471 3472 // initialize suspend/resume support - must do this before signal_sets_init() 3473 if (SR_initialize() != 0) { 3474 perror("SR_initialize failed"); 3475 return JNI_ERR; 3476 } 3477 3478 Bsd::signal_sets_init(); 3479 Bsd::install_signal_handlers(); 3480 3481 // Check and sets minimum stack sizes against command line options 3482 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3483 return JNI_ERR; 3484 } 3485 3486 if (MaxFDLimit) { 3487 // set the number of file descriptors to max. print out error 3488 // if getrlimit/setrlimit fails but continue regardless. 3489 struct rlimit nbr_files; 3490 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3491 if (status != 0) { 3492 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3493 } else { 3494 nbr_files.rlim_cur = nbr_files.rlim_max; 3495 3496 #ifdef __APPLE__ 3497 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3498 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3499 // be used instead 3500 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3501 #endif 3502 3503 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3504 if (status != 0) { 3505 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3506 } 3507 } 3508 } 3509 3510 // at-exit methods are called in the reverse order of their registration. 3511 // atexit functions are called on return from main or as a result of a 3512 // call to exit(3C). There can be only 32 of these functions registered 3513 // and atexit() does not set errno. 3514 3515 if (PerfAllowAtExitRegistration) { 3516 // only register atexit functions if PerfAllowAtExitRegistration is set. 3517 // atexit functions can be delayed until process exit time, which 3518 // can be problematic for embedded VM situations. Embedded VMs should 3519 // call DestroyJavaVM() to assure that VM resources are released. 3520 3521 // note: perfMemory_exit_helper atexit function may be removed in 3522 // the future if the appropriate cleanup code can be added to the 3523 // VM_Exit VMOperation's doit method. 3524 if (atexit(perfMemory_exit_helper) != 0) { 3525 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3526 } 3527 } 3528 3529 // initialize thread priority policy 3530 prio_init(); 3531 3532 #ifdef __APPLE__ 3533 // dynamically link to objective c gc registration 3534 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3535 if (handleLibObjc != NULL) { 3536 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3537 } 3538 #endif 3539 3540 return JNI_OK; 3541 } 3542 3543 // Mark the polling page as unreadable 3544 void os::make_polling_page_unreadable(void) { 3545 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3546 fatal("Could not disable polling page"); 3547 } 3548 } 3549 3550 // Mark the polling page as readable 3551 void os::make_polling_page_readable(void) { 3552 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3553 fatal("Could not enable polling page"); 3554 } 3555 } 3556 3557 int os::active_processor_count() { 3558 return _processor_count; 3559 } 3560 3561 void os::set_native_thread_name(const char *name) { 3562 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3563 // This is only supported in Snow Leopard and beyond 3564 if (name != NULL) { 3565 // Add a "Java: " prefix to the name 3566 char buf[MAXTHREADNAMESIZE]; 3567 snprintf(buf, sizeof(buf), "Java: %s", name); 3568 pthread_setname_np(buf); 3569 } 3570 #endif 3571 } 3572 3573 bool os::distribute_processes(uint length, uint* distribution) { 3574 // Not yet implemented. 3575 return false; 3576 } 3577 3578 bool os::bind_to_processor(uint processor_id) { 3579 // Not yet implemented. 3580 return false; 3581 } 3582 3583 void os::SuspendedThreadTask::internal_do_task() { 3584 if (do_suspend(_thread->osthread())) { 3585 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3586 do_task(context); 3587 do_resume(_thread->osthread()); 3588 } 3589 } 3590 3591 /// 3592 class PcFetcher : public os::SuspendedThreadTask { 3593 public: 3594 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3595 ExtendedPC result(); 3596 protected: 3597 void do_task(const os::SuspendedThreadTaskContext& context); 3598 private: 3599 ExtendedPC _epc; 3600 }; 3601 3602 ExtendedPC PcFetcher::result() { 3603 guarantee(is_done(), "task is not done yet."); 3604 return _epc; 3605 } 3606 3607 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3608 Thread* thread = context.thread(); 3609 OSThread* osthread = thread->osthread(); 3610 if (osthread->ucontext() != NULL) { 3611 _epc = os::Bsd::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3612 } else { 3613 // NULL context is unexpected, double-check this is the VMThread 3614 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3615 } 3616 } 3617 3618 // Suspends the target using the signal mechanism and then grabs the PC before 3619 // resuming the target. Used by the flat-profiler only 3620 ExtendedPC os::get_thread_pc(Thread* thread) { 3621 // Make sure that it is called by the watcher for the VMThread 3622 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3623 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3624 3625 PcFetcher fetcher(thread); 3626 fetcher.run(); 3627 return fetcher.result(); 3628 } 3629 3630 //////////////////////////////////////////////////////////////////////////////// 3631 // debug support 3632 3633 bool os::find(address addr, outputStream* st) { 3634 Dl_info dlinfo; 3635 memset(&dlinfo, 0, sizeof(dlinfo)); 3636 if (dladdr(addr, &dlinfo) != 0) { 3637 st->print(PTR_FORMAT ": ", addr); 3638 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3639 st->print("%s+%#x", dlinfo.dli_sname, 3640 addr - (intptr_t)dlinfo.dli_saddr); 3641 } else if (dlinfo.dli_fbase != NULL) { 3642 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3643 } else { 3644 st->print("<absolute address>"); 3645 } 3646 if (dlinfo.dli_fname != NULL) { 3647 st->print(" in %s", dlinfo.dli_fname); 3648 } 3649 if (dlinfo.dli_fbase != NULL) { 3650 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3651 } 3652 st->cr(); 3653 3654 if (Verbose) { 3655 // decode some bytes around the PC 3656 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3657 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3658 address lowest = (address) dlinfo.dli_sname; 3659 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3660 if (begin < lowest) begin = lowest; 3661 Dl_info dlinfo2; 3662 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3663 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3664 end = (address) dlinfo2.dli_saddr; 3665 } 3666 Disassembler::decode(begin, end, st); 3667 } 3668 return true; 3669 } 3670 return false; 3671 } 3672 3673 //////////////////////////////////////////////////////////////////////////////// 3674 // misc 3675 3676 // This does not do anything on Bsd. This is basically a hook for being 3677 // able to use structured exception handling (thread-local exception filters) 3678 // on, e.g., Win32. 3679 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3680 const methodHandle& method, JavaCallArguments* args, 3681 Thread* thread) { 3682 f(value, method, args, thread); 3683 } 3684 3685 void os::print_statistics() { 3686 } 3687 3688 bool os::message_box(const char* title, const char* message) { 3689 int i; 3690 fdStream err(defaultStream::error_fd()); 3691 for (i = 0; i < 78; i++) err.print_raw("="); 3692 err.cr(); 3693 err.print_raw_cr(title); 3694 for (i = 0; i < 78; i++) err.print_raw("-"); 3695 err.cr(); 3696 err.print_raw_cr(message); 3697 for (i = 0; i < 78; i++) err.print_raw("="); 3698 err.cr(); 3699 3700 char buf[16]; 3701 // Prevent process from exiting upon "read error" without consuming all CPU 3702 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3703 3704 return buf[0] == 'y' || buf[0] == 'Y'; 3705 } 3706 3707 int os::stat(const char *path, struct stat *sbuf) { 3708 char pathbuf[MAX_PATH]; 3709 if (strlen(path) > MAX_PATH - 1) { 3710 errno = ENAMETOOLONG; 3711 return -1; 3712 } 3713 os::native_path(strcpy(pathbuf, path)); 3714 return ::stat(pathbuf, sbuf); 3715 } 3716 3717 static inline struct timespec get_mtime(const char* filename) { 3718 struct stat st; 3719 int ret = os::stat(filename, &st); 3720 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3721 #ifdef __APPLE__ 3722 return st.st_mtimespec; 3723 #else 3724 return st.st_mtim; 3725 #endif 3726 } 3727 3728 int os::compare_file_modified_times(const char* file1, const char* file2) { 3729 struct timespec filetime1 = get_mtime(file1); 3730 struct timespec filetime2 = get_mtime(file2); 3731 int diff = filetime1.tv_sec - filetime2.tv_sec; 3732 if (diff == 0) { 3733 return filetime1.tv_nsec - filetime2.tv_nsec; 3734 } 3735 return diff; 3736 } 3737 3738 // Is a (classpath) directory empty? 3739 bool os::dir_is_empty(const char* path) { 3740 DIR *dir = NULL; 3741 struct dirent *ptr; 3742 3743 dir = opendir(path); 3744 if (dir == NULL) return true; 3745 3746 // Scan the directory 3747 bool result = true; 3748 char buf[sizeof(struct dirent) + MAX_PATH]; 3749 while (result && (ptr = ::readdir(dir)) != NULL) { 3750 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3751 result = false; 3752 } 3753 } 3754 closedir(dir); 3755 return result; 3756 } 3757 3758 // This code originates from JDK's sysOpen and open64_w 3759 // from src/solaris/hpi/src/system_md.c 3760 3761 int os::open(const char *path, int oflag, int mode) { 3762 if (strlen(path) > MAX_PATH - 1) { 3763 errno = ENAMETOOLONG; 3764 return -1; 3765 } 3766 int fd; 3767 3768 fd = ::open(path, oflag, mode); 3769 if (fd == -1) return -1; 3770 3771 // If the open succeeded, the file might still be a directory 3772 { 3773 struct stat buf; 3774 int ret = ::fstat(fd, &buf); 3775 int st_mode = buf.st_mode; 3776 3777 if (ret != -1) { 3778 if ((st_mode & S_IFMT) == S_IFDIR) { 3779 errno = EISDIR; 3780 ::close(fd); 3781 return -1; 3782 } 3783 } else { 3784 ::close(fd); 3785 return -1; 3786 } 3787 } 3788 3789 // All file descriptors that are opened in the JVM and not 3790 // specifically destined for a subprocess should have the 3791 // close-on-exec flag set. If we don't set it, then careless 3rd 3792 // party native code might fork and exec without closing all 3793 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3794 // UNIXProcess.c), and this in turn might: 3795 // 3796 // - cause end-of-file to fail to be detected on some file 3797 // descriptors, resulting in mysterious hangs, or 3798 // 3799 // - might cause an fopen in the subprocess to fail on a system 3800 // suffering from bug 1085341. 3801 // 3802 // (Yes, the default setting of the close-on-exec flag is a Unix 3803 // design flaw) 3804 // 3805 // See: 3806 // 1085341: 32-bit stdio routines should support file descriptors >255 3807 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3808 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3809 // 3810 #ifdef FD_CLOEXEC 3811 { 3812 int flags = ::fcntl(fd, F_GETFD); 3813 if (flags != -1) { 3814 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3815 } 3816 } 3817 #endif 3818 3819 return fd; 3820 } 3821 3822 3823 // create binary file, rewriting existing file if required 3824 int os::create_binary_file(const char* path, bool rewrite_existing) { 3825 int oflags = O_WRONLY | O_CREAT; 3826 if (!rewrite_existing) { 3827 oflags |= O_EXCL; 3828 } 3829 return ::open(path, oflags, S_IREAD | S_IWRITE); 3830 } 3831 3832 // return current position of file pointer 3833 jlong os::current_file_offset(int fd) { 3834 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3835 } 3836 3837 // move file pointer to the specified offset 3838 jlong os::seek_to_file_offset(int fd, jlong offset) { 3839 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3840 } 3841 3842 // This code originates from JDK's sysAvailable 3843 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3844 3845 int os::available(int fd, jlong *bytes) { 3846 jlong cur, end; 3847 int mode; 3848 struct stat buf; 3849 3850 if (::fstat(fd, &buf) >= 0) { 3851 mode = buf.st_mode; 3852 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3853 int n; 3854 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3855 *bytes = n; 3856 return 1; 3857 } 3858 } 3859 } 3860 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3861 return 0; 3862 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3863 return 0; 3864 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3865 return 0; 3866 } 3867 *bytes = end - cur; 3868 return 1; 3869 } 3870 3871 // Map a block of memory. 3872 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3873 char *addr, size_t bytes, bool read_only, 3874 bool allow_exec) { 3875 int prot; 3876 int flags; 3877 3878 if (read_only) { 3879 prot = PROT_READ; 3880 flags = MAP_SHARED; 3881 } else { 3882 prot = PROT_READ | PROT_WRITE; 3883 flags = MAP_PRIVATE; 3884 } 3885 3886 if (allow_exec) { 3887 prot |= PROT_EXEC; 3888 } 3889 3890 if (addr != NULL) { 3891 flags |= MAP_FIXED; 3892 } 3893 3894 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3895 fd, file_offset); 3896 if (mapped_address == MAP_FAILED) { 3897 return NULL; 3898 } 3899 return mapped_address; 3900 } 3901 3902 3903 // Remap a block of memory. 3904 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3905 char *addr, size_t bytes, bool read_only, 3906 bool allow_exec) { 3907 // same as map_memory() on this OS 3908 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3909 allow_exec); 3910 } 3911 3912 3913 // Unmap a block of memory. 3914 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3915 return munmap(addr, bytes) == 0; 3916 } 3917 3918 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3919 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3920 // of a thread. 3921 // 3922 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3923 // the fast estimate available on the platform. 3924 3925 jlong os::current_thread_cpu_time() { 3926 #ifdef __APPLE__ 3927 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3928 #else 3929 Unimplemented(); 3930 return 0; 3931 #endif 3932 } 3933 3934 jlong os::thread_cpu_time(Thread* thread) { 3935 #ifdef __APPLE__ 3936 return os::thread_cpu_time(thread, true /* user + sys */); 3937 #else 3938 Unimplemented(); 3939 return 0; 3940 #endif 3941 } 3942 3943 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3944 #ifdef __APPLE__ 3945 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3946 #else 3947 Unimplemented(); 3948 return 0; 3949 #endif 3950 } 3951 3952 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3953 #ifdef __APPLE__ 3954 struct thread_basic_info tinfo; 3955 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3956 kern_return_t kr; 3957 thread_t mach_thread; 3958 3959 mach_thread = thread->osthread()->thread_id(); 3960 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3961 if (kr != KERN_SUCCESS) { 3962 return -1; 3963 } 3964 3965 if (user_sys_cpu_time) { 3966 jlong nanos; 3967 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3968 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3969 return nanos; 3970 } else { 3971 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3972 } 3973 #else 3974 Unimplemented(); 3975 return 0; 3976 #endif 3977 } 3978 3979 3980 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3981 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3982 info_ptr->may_skip_backward = false; // elapsed time not wall time 3983 info_ptr->may_skip_forward = false; // elapsed time not wall time 3984 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3985 } 3986 3987 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3988 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3989 info_ptr->may_skip_backward = false; // elapsed time not wall time 3990 info_ptr->may_skip_forward = false; // elapsed time not wall time 3991 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3992 } 3993 3994 bool os::is_thread_cpu_time_supported() { 3995 #ifdef __APPLE__ 3996 return true; 3997 #else 3998 return false; 3999 #endif 4000 } 4001 4002 // System loadavg support. Returns -1 if load average cannot be obtained. 4003 // Bsd doesn't yet have a (official) notion of processor sets, 4004 // so just return the system wide load average. 4005 int os::loadavg(double loadavg[], int nelem) { 4006 return ::getloadavg(loadavg, nelem); 4007 } 4008 4009 void os::pause() { 4010 char filename[MAX_PATH]; 4011 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4012 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4013 } else { 4014 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4015 } 4016 4017 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4018 if (fd != -1) { 4019 struct stat buf; 4020 ::close(fd); 4021 while (::stat(filename, &buf) == 0) { 4022 (void)::poll(NULL, 0, 100); 4023 } 4024 } else { 4025 jio_fprintf(stderr, 4026 "Could not open pause file '%s', continuing immediately.\n", filename); 4027 } 4028 } 4029 4030 4031 // Refer to the comments in os_solaris.cpp park-unpark. The next two 4032 // comment paragraphs are worth repeating here: 4033 // 4034 // Assumption: 4035 // Only one parker can exist on an event, which is why we allocate 4036 // them per-thread. Multiple unparkers can coexist. 4037 // 4038 // _Event serves as a restricted-range semaphore. 4039 // -1 : thread is blocked, i.e. there is a waiter 4040 // 0 : neutral: thread is running or ready, 4041 // could have been signaled after a wait started 4042 // 1 : signaled - thread is running or ready 4043 // 4044 4045 // utility to compute the abstime argument to timedwait: 4046 // millis is the relative timeout time 4047 // abstime will be the absolute timeout time 4048 // TODO: replace compute_abstime() with unpackTime() 4049 4050 static struct timespec* compute_abstime(struct timespec* abstime, 4051 jlong millis) { 4052 if (millis < 0) millis = 0; 4053 struct timeval now; 4054 int status = gettimeofday(&now, NULL); 4055 assert(status == 0, "gettimeofday"); 4056 jlong seconds = millis / 1000; 4057 millis %= 1000; 4058 if (seconds > 50000000) { // see man cond_timedwait(3T) 4059 seconds = 50000000; 4060 } 4061 abstime->tv_sec = now.tv_sec + seconds; 4062 long usec = now.tv_usec + millis * 1000; 4063 if (usec >= 1000000) { 4064 abstime->tv_sec += 1; 4065 usec -= 1000000; 4066 } 4067 abstime->tv_nsec = usec * 1000; 4068 return abstime; 4069 } 4070 4071 void os::PlatformEvent::park() { // AKA "down()" 4072 // Transitions for _Event: 4073 // -1 => -1 : illegal 4074 // 1 => 0 : pass - return immediately 4075 // 0 => -1 : block; then set _Event to 0 before returning 4076 4077 // Invariant: Only the thread associated with the Event/PlatformEvent 4078 // may call park(). 4079 // TODO: assert that _Assoc != NULL or _Assoc == Self 4080 assert(_nParked == 0, "invariant"); 4081 4082 int v; 4083 for (;;) { 4084 v = _Event; 4085 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4086 } 4087 guarantee(v >= 0, "invariant"); 4088 if (v == 0) { 4089 // Do this the hard way by blocking ... 4090 int status = pthread_mutex_lock(_mutex); 4091 assert_status(status == 0, status, "mutex_lock"); 4092 guarantee(_nParked == 0, "invariant"); 4093 ++_nParked; 4094 while (_Event < 0) { 4095 status = pthread_cond_wait(_cond, _mutex); 4096 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4097 // Treat this the same as if the wait was interrupted 4098 if (status == ETIMEDOUT) { status = EINTR; } 4099 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4100 } 4101 --_nParked; 4102 4103 _Event = 0; 4104 status = pthread_mutex_unlock(_mutex); 4105 assert_status(status == 0, status, "mutex_unlock"); 4106 // Paranoia to ensure our locked and lock-free paths interact 4107 // correctly with each other. 4108 OrderAccess::fence(); 4109 } 4110 guarantee(_Event >= 0, "invariant"); 4111 } 4112 4113 int os::PlatformEvent::park(jlong millis) { 4114 // Transitions for _Event: 4115 // -1 => -1 : illegal 4116 // 1 => 0 : pass - return immediately 4117 // 0 => -1 : block; then set _Event to 0 before returning 4118 4119 guarantee(_nParked == 0, "invariant"); 4120 4121 int v; 4122 for (;;) { 4123 v = _Event; 4124 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4125 } 4126 guarantee(v >= 0, "invariant"); 4127 if (v != 0) return OS_OK; 4128 4129 // We do this the hard way, by blocking the thread. 4130 // Consider enforcing a minimum timeout value. 4131 struct timespec abst; 4132 compute_abstime(&abst, millis); 4133 4134 int ret = OS_TIMEOUT; 4135 int status = pthread_mutex_lock(_mutex); 4136 assert_status(status == 0, status, "mutex_lock"); 4137 guarantee(_nParked == 0, "invariant"); 4138 ++_nParked; 4139 4140 // Object.wait(timo) will return because of 4141 // (a) notification 4142 // (b) timeout 4143 // (c) thread.interrupt 4144 // 4145 // Thread.interrupt and object.notify{All} both call Event::set. 4146 // That is, we treat thread.interrupt as a special case of notification. 4147 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false. 4148 // We assume all ETIME returns are valid. 4149 // 4150 // TODO: properly differentiate simultaneous notify+interrupt. 4151 // In that case, we should propagate the notify to another waiter. 4152 4153 while (_Event < 0) { 4154 status = pthread_cond_timedwait(_cond, _mutex, &abst); 4155 assert_status(status == 0 || status == EINTR || 4156 status == ETIMEDOUT, 4157 status, "cond_timedwait"); 4158 if (!FilterSpuriousWakeups) break; // previous semantics 4159 if (status == ETIMEDOUT) break; 4160 // We consume and ignore EINTR and spurious wakeups. 4161 } 4162 --_nParked; 4163 if (_Event >= 0) { 4164 ret = OS_OK; 4165 } 4166 _Event = 0; 4167 status = pthread_mutex_unlock(_mutex); 4168 assert_status(status == 0, status, "mutex_unlock"); 4169 assert(_nParked == 0, "invariant"); 4170 // Paranoia to ensure our locked and lock-free paths interact 4171 // correctly with each other. 4172 OrderAccess::fence(); 4173 return ret; 4174 } 4175 4176 void os::PlatformEvent::unpark() { 4177 // Transitions for _Event: 4178 // 0 => 1 : just return 4179 // 1 => 1 : just return 4180 // -1 => either 0 or 1; must signal target thread 4181 // That is, we can safely transition _Event from -1 to either 4182 // 0 or 1. 4183 // See also: "Semaphores in Plan 9" by Mullender & Cox 4184 // 4185 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4186 // that it will take two back-to-back park() calls for the owning 4187 // thread to block. This has the benefit of forcing a spurious return 4188 // from the first park() call after an unpark() call which will help 4189 // shake out uses of park() and unpark() without condition variables. 4190 4191 if (Atomic::xchg(1, &_Event) >= 0) return; 4192 4193 // Wait for the thread associated with the event to vacate 4194 int status = pthread_mutex_lock(_mutex); 4195 assert_status(status == 0, status, "mutex_lock"); 4196 int AnyWaiters = _nParked; 4197 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4198 status = pthread_mutex_unlock(_mutex); 4199 assert_status(status == 0, status, "mutex_unlock"); 4200 if (AnyWaiters != 0) { 4201 // Note that we signal() *after* dropping the lock for "immortal" Events. 4202 // This is safe and avoids a common class of futile wakeups. In rare 4203 // circumstances this can cause a thread to return prematurely from 4204 // cond_{timed}wait() but the spurious wakeup is benign and the victim 4205 // will simply re-test the condition and re-park itself. 4206 // This provides particular benefit if the underlying platform does not 4207 // provide wait morphing. 4208 status = pthread_cond_signal(_cond); 4209 assert_status(status == 0, status, "cond_signal"); 4210 } 4211 } 4212 4213 4214 // JSR166 4215 // ------------------------------------------------------- 4216 4217 // The solaris and bsd implementations of park/unpark are fairly 4218 // conservative for now, but can be improved. They currently use a 4219 // mutex/condvar pair, plus a a count. 4220 // Park decrements count if > 0, else does a condvar wait. Unpark 4221 // sets count to 1 and signals condvar. Only one thread ever waits 4222 // on the condvar. Contention seen when trying to park implies that someone 4223 // is unparking you, so don't wait. And spurious returns are fine, so there 4224 // is no need to track notifications. 4225 4226 #define MAX_SECS 100000000 4227 4228 // This code is common to bsd and solaris and will be moved to a 4229 // common place in dolphin. 4230 // 4231 // The passed in time value is either a relative time in nanoseconds 4232 // or an absolute time in milliseconds. Either way it has to be unpacked 4233 // into suitable seconds and nanoseconds components and stored in the 4234 // given timespec structure. 4235 // Given time is a 64-bit value and the time_t used in the timespec is only 4236 // a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4237 // overflow if times way in the future are given. Further on Solaris versions 4238 // prior to 10 there is a restriction (see cond_timedwait) that the specified 4239 // number of seconds, in abstime, is less than current_time + 100,000,000. 4240 // As it will be 28 years before "now + 100000000" will overflow we can 4241 // ignore overflow and just impose a hard-limit on seconds using the value 4242 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 4243 // years from "now". 4244 4245 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4246 assert(time > 0, "convertTime"); 4247 4248 struct timeval now; 4249 int status = gettimeofday(&now, NULL); 4250 assert(status == 0, "gettimeofday"); 4251 4252 time_t max_secs = now.tv_sec + MAX_SECS; 4253 4254 if (isAbsolute) { 4255 jlong secs = time / 1000; 4256 if (secs > max_secs) { 4257 absTime->tv_sec = max_secs; 4258 } else { 4259 absTime->tv_sec = secs; 4260 } 4261 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4262 } else { 4263 jlong secs = time / NANOSECS_PER_SEC; 4264 if (secs >= MAX_SECS) { 4265 absTime->tv_sec = max_secs; 4266 absTime->tv_nsec = 0; 4267 } else { 4268 absTime->tv_sec = now.tv_sec + secs; 4269 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4270 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4271 absTime->tv_nsec -= NANOSECS_PER_SEC; 4272 ++absTime->tv_sec; // note: this must be <= max_secs 4273 } 4274 } 4275 } 4276 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4277 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4278 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4279 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4280 } 4281 4282 void Parker::park(bool isAbsolute, jlong time) { 4283 // Ideally we'd do something useful while spinning, such 4284 // as calling unpackTime(). 4285 4286 // Optional fast-path check: 4287 // Return immediately if a permit is available. 4288 // We depend on Atomic::xchg() having full barrier semantics 4289 // since we are doing a lock-free update to _counter. 4290 if (Atomic::xchg(0, &_counter) > 0) return; 4291 4292 Thread* thread = Thread::current(); 4293 assert(thread->is_Java_thread(), "Must be JavaThread"); 4294 JavaThread *jt = (JavaThread *)thread; 4295 4296 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4297 // Check interrupt before trying to wait 4298 if (Thread::is_interrupted(thread, false)) { 4299 return; 4300 } 4301 4302 // Next, demultiplex/decode time arguments 4303 struct timespec absTime; 4304 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 4305 return; 4306 } 4307 if (time > 0) { 4308 unpackTime(&absTime, isAbsolute, time); 4309 } 4310 4311 4312 // Enter safepoint region 4313 // Beware of deadlocks such as 6317397. 4314 // The per-thread Parker:: mutex is a classic leaf-lock. 4315 // In particular a thread must never block on the Threads_lock while 4316 // holding the Parker:: mutex. If safepoints are pending both the 4317 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4318 ThreadBlockInVM tbivm(jt); 4319 4320 // Don't wait if cannot get lock since interference arises from 4321 // unblocking. Also. check interrupt before trying wait 4322 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4323 return; 4324 } 4325 4326 int status; 4327 if (_counter > 0) { // no wait needed 4328 _counter = 0; 4329 status = pthread_mutex_unlock(_mutex); 4330 assert_status(status == 0, status, "invariant"); 4331 // Paranoia to ensure our locked and lock-free paths interact 4332 // correctly with each other and Java-level accesses. 4333 OrderAccess::fence(); 4334 return; 4335 } 4336 4337 #ifdef ASSERT 4338 // Don't catch signals while blocked; let the running threads have the signals. 4339 // (This allows a debugger to break into the running thread.) 4340 sigset_t oldsigs; 4341 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4342 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4343 #endif 4344 4345 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4346 jt->set_suspend_equivalent(); 4347 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4348 4349 if (time == 0) { 4350 status = pthread_cond_wait(_cond, _mutex); 4351 } else { 4352 status = pthread_cond_timedwait(_cond, _mutex, &absTime); 4353 } 4354 assert_status(status == 0 || status == EINTR || 4355 status == ETIMEDOUT, 4356 status, "cond_timedwait"); 4357 4358 #ifdef ASSERT 4359 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4360 #endif 4361 4362 _counter = 0; 4363 status = pthread_mutex_unlock(_mutex); 4364 assert_status(status == 0, status, "invariant"); 4365 // Paranoia to ensure our locked and lock-free paths interact 4366 // correctly with each other and Java-level accesses. 4367 OrderAccess::fence(); 4368 4369 // If externally suspended while waiting, re-suspend 4370 if (jt->handle_special_suspend_equivalent_condition()) { 4371 jt->java_suspend_self(); 4372 } 4373 } 4374 4375 void Parker::unpark() { 4376 int status = pthread_mutex_lock(_mutex); 4377 assert_status(status == 0, status, "invariant"); 4378 const int s = _counter; 4379 _counter = 1; 4380 status = pthread_mutex_unlock(_mutex); 4381 assert_status(status == 0, status, "invariant"); 4382 if (s < 1) { 4383 status = pthread_cond_signal(_cond); 4384 assert_status(status == 0, status, "invariant"); 4385 } 4386 } 4387 4388 4389 // Darwin has no "environ" in a dynamic library. 4390 #ifdef __APPLE__ 4391 #include <crt_externs.h> 4392 #define environ (*_NSGetEnviron()) 4393 #else 4394 extern char** environ; 4395 #endif 4396 4397 // Run the specified command in a separate process. Return its exit value, 4398 // or -1 on failure (e.g. can't fork a new process). 4399 // Unlike system(), this function can be called from signal handler. It 4400 // doesn't block SIGINT et al. 4401 int os::fork_and_exec(char* cmd) { 4402 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4403 4404 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4405 // pthread_atfork handlers and reset pthread library. All we need is a 4406 // separate process to execve. Make a direct syscall to fork process. 4407 // On IA64 there's no fork syscall, we have to use fork() and hope for 4408 // the best... 4409 pid_t pid = fork(); 4410 4411 if (pid < 0) { 4412 // fork failed 4413 return -1; 4414 4415 } else if (pid == 0) { 4416 // child process 4417 4418 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4419 // first to kill every thread on the thread list. Because this list is 4420 // not reset by fork() (see notes above), execve() will instead kill 4421 // every thread in the parent process. We know this is the only thread 4422 // in the new process, so make a system call directly. 4423 // IA64 should use normal execve() from glibc to match the glibc fork() 4424 // above. 4425 execve("/bin/sh", (char* const*)argv, environ); 4426 4427 // execve failed 4428 _exit(-1); 4429 4430 } else { 4431 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4432 // care about the actual exit code, for now. 4433 4434 int status; 4435 4436 // Wait for the child process to exit. This returns immediately if 4437 // the child has already exited. */ 4438 while (waitpid(pid, &status, 0) < 0) { 4439 switch (errno) { 4440 case ECHILD: return 0; 4441 case EINTR: break; 4442 default: return -1; 4443 } 4444 } 4445 4446 if (WIFEXITED(status)) { 4447 // The child exited normally; get its exit code. 4448 return WEXITSTATUS(status); 4449 } else if (WIFSIGNALED(status)) { 4450 // The child exited because of a signal 4451 // The best value to return is 0x80 + signal number, 4452 // because that is what all Unix shells do, and because 4453 // it allows callers to distinguish between process exit and 4454 // process death by signal. 4455 return 0x80 + WTERMSIG(status); 4456 } else { 4457 // Unknown exit code; pass it through 4458 return status; 4459 } 4460 } 4461 } 4462 4463 // is_headless_jre() 4464 // 4465 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4466 // in order to report if we are running in a headless jre 4467 // 4468 // Since JDK8 xawt/libmawt.so was moved into the same directory 4469 // as libawt.so, and renamed libawt_xawt.so 4470 // 4471 bool os::is_headless_jre() { 4472 #ifdef __APPLE__ 4473 // We no longer build headless-only on Mac OS X 4474 return false; 4475 #else 4476 struct stat statbuf; 4477 char buf[MAXPATHLEN]; 4478 char libmawtpath[MAXPATHLEN]; 4479 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4480 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4481 char *p; 4482 4483 // Get path to libjvm.so 4484 os::jvm_path(buf, sizeof(buf)); 4485 4486 // Get rid of libjvm.so 4487 p = strrchr(buf, '/'); 4488 if (p == NULL) { 4489 return false; 4490 } else { 4491 *p = '\0'; 4492 } 4493 4494 // Get rid of client or server 4495 p = strrchr(buf, '/'); 4496 if (p == NULL) { 4497 return false; 4498 } else { 4499 *p = '\0'; 4500 } 4501 4502 // check xawt/libmawt.so 4503 strcpy(libmawtpath, buf); 4504 strcat(libmawtpath, xawtstr); 4505 if (::stat(libmawtpath, &statbuf) == 0) return false; 4506 4507 // check libawt_xawt.so 4508 strcpy(libmawtpath, buf); 4509 strcat(libmawtpath, new_xawtstr); 4510 if (::stat(libmawtpath, &statbuf) == 0) return false; 4511 4512 return true; 4513 #endif 4514 } 4515 4516 // Get the default path to the core file 4517 // Returns the length of the string 4518 int os::get_core_path(char* buffer, size_t bufferSize) { 4519 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 4520 4521 // Truncate if theoretical string was longer than bufferSize 4522 n = MIN2(n, (int)bufferSize); 4523 4524 return n; 4525 } 4526 4527 #ifndef PRODUCT 4528 void TestReserveMemorySpecial_test() { 4529 // No tests available for this platform 4530 } 4531 #endif 4532 4533 bool os::start_debugging(char *buf, int buflen) { 4534 int len = (int)strlen(buf); 4535 char *p = &buf[len]; 4536 4537 jio_snprintf(p, buflen-len, 4538 "\n\n" 4539 "Do you want to debug the problem?\n\n" 4540 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 4541 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 4542 "Otherwise, press RETURN to abort...", 4543 os::current_process_id(), os::current_process_id(), 4544 os::current_thread_id(), os::current_thread_id()); 4545 4546 bool yes = os::message_box("Unexpected Error", buf); 4547 4548 if (yes) { 4549 // yes, user asked VM to launch debugger 4550 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 4551 os::current_process_id(), os::current_process_id()); 4552 4553 os::fork_and_exec(buf); 4554 yes = false; 4555 } 4556 return yes; 4557 }