1 /* 2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "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/align.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/vmError.hpp" 72 73 // put OS-includes here 74 # include <sys/types.h> 75 # include <sys/mman.h> 76 # include <sys/stat.h> 77 # include <sys/select.h> 78 # include <pthread.h> 79 # include <signal.h> 80 # include <errno.h> 81 # include <dlfcn.h> 82 # include <stdio.h> 83 # include <unistd.h> 84 # include <sys/resource.h> 85 # include <pthread.h> 86 # include <sys/stat.h> 87 # include <sys/time.h> 88 # include <sys/times.h> 89 # include <sys/utsname.h> 90 # include <sys/socket.h> 91 # include <sys/wait.h> 92 # include <time.h> 93 # include <pwd.h> 94 # include <poll.h> 95 # include <semaphore.h> 96 # include <fcntl.h> 97 # include <string.h> 98 # include <sys/param.h> 99 # include <sys/sysctl.h> 100 # include <sys/ipc.h> 101 # include <sys/shm.h> 102 #ifndef __APPLE__ 103 # include <link.h> 104 #endif 105 # include <stdint.h> 106 # include <inttypes.h> 107 # include <sys/ioctl.h> 108 # include <sys/syscall.h> 109 110 #if defined(__FreeBSD__) || defined(__NetBSD__) 111 #include <elf.h> 112 #endif 113 114 #ifdef __APPLE__ 115 #include <mach/mach.h> // semaphore_* API 116 #include <mach-o/dyld.h> 117 #include <sys/proc_info.h> 118 #include <objc/objc-auto.h> 119 #endif 120 121 #ifndef MAP_ANONYMOUS 122 #define MAP_ANONYMOUS MAP_ANON 123 #endif 124 125 #define MAX_PATH (2 * K) 126 127 // for timer info max values which include all bits 128 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 129 130 #define LARGEPAGES_BIT (1 << 6) 131 132 //////////////////////////////////////////////////////////////////////////////// 133 // global variables 134 julong os::Bsd::_physical_memory = 0; 135 136 #ifdef __APPLE__ 137 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; 138 volatile uint64_t os::Bsd::_max_abstime = 0; 139 #else 140 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 141 #endif 142 pthread_t os::Bsd::_main_thread; 143 int os::Bsd::_page_size = -1; 144 145 static jlong initial_time_count=0; 146 147 static int clock_tics_per_sec = 100; 148 149 // For diagnostics to print a message once. see run_periodic_checks 150 static sigset_t check_signal_done; 151 static bool check_signals = true; 152 153 static pid_t _initial_pid = 0; 154 155 // Signal number used to suspend/resume a thread 156 157 // do not use any signal number less than SIGSEGV, see 4355769 158 static int SR_signum = SIGUSR2; 159 sigset_t SR_sigset; 160 161 162 //////////////////////////////////////////////////////////////////////////////// 163 // utility functions 164 165 static int SR_initialize(); 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; 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 sigaddset(&unblocked_sigs, SIGILL); 568 sigaddset(&unblocked_sigs, SIGSEGV); 569 sigaddset(&unblocked_sigs, SIGBUS); 570 sigaddset(&unblocked_sigs, SIGFPE); 571 sigaddset(&unblocked_sigs, SR_signum); 572 573 if (!ReduceSignalUsage) { 574 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 575 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 576 577 } 578 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 579 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 580 } 581 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 582 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 583 } 584 } 585 // Fill in signals that are blocked by all but the VM thread. 586 sigemptyset(&vm_sigs); 587 if (!ReduceSignalUsage) { 588 sigaddset(&vm_sigs, BREAK_SIGNAL); 589 } 590 debug_only(signal_sets_initialized = true); 591 592 } 593 594 // These are signals that are unblocked while a thread is running Java. 595 // (For some reason, they get blocked by default.) 596 sigset_t* os::Bsd::unblocked_signals() { 597 assert(signal_sets_initialized, "Not initialized"); 598 return &unblocked_sigs; 599 } 600 601 // These are the signals that are blocked while a (non-VM) thread is 602 // running Java. Only the VM thread handles these signals. 603 sigset_t* os::Bsd::vm_signals() { 604 assert(signal_sets_initialized, "Not initialized"); 605 return &vm_sigs; 606 } 607 608 void os::Bsd::hotspot_sigmask(Thread* thread) { 609 610 //Save caller's signal mask before setting VM signal mask 611 sigset_t caller_sigmask; 612 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 613 614 OSThread* osthread = thread->osthread(); 615 osthread->set_caller_sigmask(caller_sigmask); 616 617 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 618 619 if (!ReduceSignalUsage) { 620 if (thread->is_VM_thread()) { 621 // Only the VM thread handles BREAK_SIGNAL ... 622 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 623 } else { 624 // ... all other threads block BREAK_SIGNAL 625 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 626 } 627 } 628 } 629 630 631 ////////////////////////////////////////////////////////////////////////////// 632 // create new thread 633 634 #ifdef __APPLE__ 635 // library handle for calling objc_registerThreadWithCollector() 636 // without static linking to the libobjc library 637 #define OBJC_LIB "/usr/lib/libobjc.dylib" 638 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 639 typedef void (*objc_registerThreadWithCollector_t)(); 640 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 641 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 642 #endif 643 644 #ifdef __APPLE__ 645 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 646 // Additional thread_id used to correlate threads in SA 647 thread_identifier_info_data_t m_ident_info; 648 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 649 650 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 651 (thread_info_t) &m_ident_info, &count); 652 653 return m_ident_info.thread_id; 654 } 655 #endif 656 657 // Thread start routine for all newly created threads 658 static void *thread_native_entry(Thread *thread) { 659 // Try to randomize the cache line index of hot stack frames. 660 // This helps when threads of the same stack traces evict each other's 661 // cache lines. The threads can be either from the same JVM instance, or 662 // from different JVM instances. The benefit is especially true for 663 // processors with hyperthreading technology. 664 static int counter = 0; 665 int pid = os::current_process_id(); 666 alloca(((pid ^ counter++) & 7) * 128); 667 668 thread->initialize_thread_current(); 669 670 OSThread* osthread = thread->osthread(); 671 Monitor* sync = osthread->startThread_lock(); 672 673 osthread->set_thread_id(os::Bsd::gettid()); 674 675 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 676 os::current_thread_id(), (uintx) pthread_self()); 677 678 #ifdef __APPLE__ 679 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 680 guarantee(unique_thread_id != 0, "unique thread id was not found"); 681 osthread->set_unique_thread_id(unique_thread_id); 682 #endif 683 // initialize signal mask for this thread 684 os::Bsd::hotspot_sigmask(thread); 685 686 // initialize floating point control register 687 os::Bsd::init_thread_fpu_state(); 688 689 #ifdef __APPLE__ 690 // register thread with objc gc 691 if (objc_registerThreadWithCollectorFunction != NULL) { 692 objc_registerThreadWithCollectorFunction(); 693 } 694 #endif 695 696 // handshaking with parent thread 697 { 698 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 699 700 // notify parent thread 701 osthread->set_state(INITIALIZED); 702 sync->notify_all(); 703 704 // wait until os::start_thread() 705 while (osthread->get_state() == INITIALIZED) { 706 sync->wait(Mutex::_no_safepoint_check_flag); 707 } 708 } 709 710 // call one more level start routine 711 thread->run(); 712 713 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 714 os::current_thread_id(), (uintx) pthread_self()); 715 716 // If a thread has not deleted itself ("delete this") as part of its 717 // termination sequence, we have to ensure thread-local-storage is 718 // cleared before we actually terminate. No threads should ever be 719 // deleted asynchronously with respect to their termination. 720 if (Thread::current_or_null_safe() != NULL) { 721 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 722 thread->clear_thread_current(); 723 } 724 725 return 0; 726 } 727 728 bool os::create_thread(Thread* thread, ThreadType thr_type, 729 size_t req_stack_size) { 730 assert(thread->osthread() == NULL, "caller responsible"); 731 732 // Allocate the OSThread object 733 OSThread* osthread = new OSThread(NULL, NULL); 734 if (osthread == NULL) { 735 return false; 736 } 737 738 // set the correct thread state 739 osthread->set_thread_type(thr_type); 740 741 // Initial state is ALLOCATED but not INITIALIZED 742 osthread->set_state(ALLOCATED); 743 744 thread->set_osthread(osthread); 745 746 // init thread attributes 747 pthread_attr_t attr; 748 pthread_attr_init(&attr); 749 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 750 751 // calculate stack size if it's not specified by caller 752 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 753 int status = pthread_attr_setstacksize(&attr, stack_size); 754 assert_status(status == 0, status, "pthread_attr_setstacksize"); 755 756 ThreadState state; 757 758 { 759 pthread_t tid; 760 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 761 762 char buf[64]; 763 if (ret == 0) { 764 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 765 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 766 } else { 767 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 768 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 769 } 770 771 pthread_attr_destroy(&attr); 772 773 if (ret != 0) { 774 // Need to clean up stuff we've allocated so far 775 thread->set_osthread(NULL); 776 delete osthread; 777 return false; 778 } 779 780 // Store pthread info into the OSThread 781 osthread->set_pthread_id(tid); 782 783 // Wait until child thread is either initialized or aborted 784 { 785 Monitor* sync_with_child = osthread->startThread_lock(); 786 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 787 while ((state = osthread->get_state()) == ALLOCATED) { 788 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 789 } 790 } 791 792 } 793 794 // Aborted due to thread limit being reached 795 if (state == ZOMBIE) { 796 thread->set_osthread(NULL); 797 delete osthread; 798 return false; 799 } 800 801 // The thread is returned suspended (in state INITIALIZED), 802 // and is started higher up in the call chain 803 assert(state == INITIALIZED, "race condition"); 804 return true; 805 } 806 807 ///////////////////////////////////////////////////////////////////////////// 808 // attach existing thread 809 810 // bootstrap the main thread 811 bool os::create_main_thread(JavaThread* thread) { 812 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 813 return create_attached_thread(thread); 814 } 815 816 bool os::create_attached_thread(JavaThread* thread) { 817 #ifdef ASSERT 818 thread->verify_not_published(); 819 #endif 820 821 // Allocate the OSThread object 822 OSThread* osthread = new OSThread(NULL, NULL); 823 824 if (osthread == NULL) { 825 return false; 826 } 827 828 osthread->set_thread_id(os::Bsd::gettid()); 829 830 // Store pthread info into the OSThread 831 #ifdef __APPLE__ 832 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 833 guarantee(unique_thread_id != 0, "just checking"); 834 osthread->set_unique_thread_id(unique_thread_id); 835 #endif 836 osthread->set_pthread_id(::pthread_self()); 837 838 // initialize floating point control register 839 os::Bsd::init_thread_fpu_state(); 840 841 // Initial thread state is RUNNABLE 842 osthread->set_state(RUNNABLE); 843 844 thread->set_osthread(osthread); 845 846 // initialize signal mask for this thread 847 // and save the caller's signal mask 848 os::Bsd::hotspot_sigmask(thread); 849 850 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 851 os::current_thread_id(), (uintx) pthread_self()); 852 853 return true; 854 } 855 856 void os::pd_start_thread(Thread* thread) { 857 OSThread * osthread = thread->osthread(); 858 assert(osthread->get_state() != INITIALIZED, "just checking"); 859 Monitor* sync_with_child = osthread->startThread_lock(); 860 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 861 sync_with_child->notify(); 862 } 863 864 // Free Bsd resources related to the OSThread 865 void os::free_thread(OSThread* osthread) { 866 assert(osthread != NULL, "osthread not set"); 867 868 // We are told to free resources of the argument thread, 869 // but we can only really operate on the current thread. 870 assert(Thread::current()->osthread() == osthread, 871 "os::free_thread but not current thread"); 872 873 // Restore caller's signal mask 874 sigset_t sigmask = osthread->caller_sigmask(); 875 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 876 877 delete osthread; 878 } 879 880 //////////////////////////////////////////////////////////////////////////////// 881 // time support 882 883 // Time since start-up in seconds to a fine granularity. 884 // Used by VMSelfDestructTimer and the MemProfiler. 885 double os::elapsedTime() { 886 887 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 888 } 889 890 jlong os::elapsed_counter() { 891 return javaTimeNanos() - initial_time_count; 892 } 893 894 jlong os::elapsed_frequency() { 895 return NANOSECS_PER_SEC; // nanosecond resolution 896 } 897 898 bool os::supports_vtime() { return true; } 899 bool os::enable_vtime() { return false; } 900 bool os::vtime_enabled() { return false; } 901 902 double os::elapsedVTime() { 903 // better than nothing, but not much 904 return elapsedTime(); 905 } 906 907 jlong os::javaTimeMillis() { 908 timeval time; 909 int status = gettimeofday(&time, NULL); 910 assert(status != -1, "bsd error"); 911 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 912 } 913 914 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 915 timeval time; 916 int status = gettimeofday(&time, NULL); 917 assert(status != -1, "bsd error"); 918 seconds = jlong(time.tv_sec); 919 nanos = jlong(time.tv_usec) * 1000; 920 } 921 922 #ifndef __APPLE__ 923 #ifndef CLOCK_MONOTONIC 924 #define CLOCK_MONOTONIC (1) 925 #endif 926 #endif 927 928 #ifdef __APPLE__ 929 void os::Bsd::clock_init() { 930 mach_timebase_info(&_timebase_info); 931 } 932 #else 933 void os::Bsd::clock_init() { 934 struct timespec res; 935 struct timespec tp; 936 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 937 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 938 // yes, monotonic clock is supported 939 _clock_gettime = ::clock_gettime; 940 } 941 } 942 #endif 943 944 945 946 #ifdef __APPLE__ 947 948 jlong os::javaTimeNanos() { 949 const uint64_t tm = mach_absolute_time(); 950 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 951 const uint64_t prev = Bsd::_max_abstime; 952 if (now <= prev) { 953 return prev; // same or retrograde time; 954 } 955 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev); 956 assert(obsv >= prev, "invariant"); // Monotonicity 957 // If the CAS succeeded then we're done and return "now". 958 // If the CAS failed and the observed value "obsv" is >= now then 959 // we should return "obsv". If the CAS failed and now > obsv > prv then 960 // some other thread raced this thread and installed a new value, in which case 961 // we could either (a) retry the entire operation, (b) retry trying to install now 962 // or (c) just return obsv. We use (c). No loop is required although in some cases 963 // we might discard a higher "now" value in deference to a slightly lower but freshly 964 // installed obsv value. That's entirely benign -- it admits no new orderings compared 965 // to (a) or (b) -- and greatly reduces coherence traffic. 966 // We might also condition (c) on the magnitude of the delta between obsv and now. 967 // Avoiding excessive CAS operations to hot RW locations is critical. 968 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 969 return (prev == obsv) ? now : obsv; 970 } 971 972 #else // __APPLE__ 973 974 jlong os::javaTimeNanos() { 975 if (os::supports_monotonic_clock()) { 976 struct timespec tp; 977 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 978 assert(status == 0, "gettime error"); 979 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 980 return result; 981 } else { 982 timeval time; 983 int status = gettimeofday(&time, NULL); 984 assert(status != -1, "bsd error"); 985 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 986 return 1000 * usecs; 987 } 988 } 989 990 #endif // __APPLE__ 991 992 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 993 if (os::supports_monotonic_clock()) { 994 info_ptr->max_value = ALL_64_BITS; 995 996 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 997 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 998 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 999 } else { 1000 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1001 info_ptr->max_value = ALL_64_BITS; 1002 1003 // gettimeofday is a real time clock so it skips 1004 info_ptr->may_skip_backward = true; 1005 info_ptr->may_skip_forward = true; 1006 } 1007 1008 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1009 } 1010 1011 // Return the real, user, and system times in seconds from an 1012 // arbitrary fixed point in the past. 1013 bool os::getTimesSecs(double* process_real_time, 1014 double* process_user_time, 1015 double* process_system_time) { 1016 struct tms ticks; 1017 clock_t real_ticks = times(&ticks); 1018 1019 if (real_ticks == (clock_t) (-1)) { 1020 return false; 1021 } else { 1022 double ticks_per_second = (double) clock_tics_per_sec; 1023 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1024 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1025 *process_real_time = ((double) real_ticks) / ticks_per_second; 1026 1027 return true; 1028 } 1029 } 1030 1031 1032 char * os::local_time_string(char *buf, size_t buflen) { 1033 struct tm t; 1034 time_t long_time; 1035 time(&long_time); 1036 localtime_r(&long_time, &t); 1037 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1038 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1039 t.tm_hour, t.tm_min, t.tm_sec); 1040 return buf; 1041 } 1042 1043 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1044 return localtime_r(clock, res); 1045 } 1046 1047 //////////////////////////////////////////////////////////////////////////////// 1048 // runtime exit support 1049 1050 // Note: os::shutdown() might be called very early during initialization, or 1051 // called from signal handler. Before adding something to os::shutdown(), make 1052 // sure it is async-safe and can handle partially initialized VM. 1053 void os::shutdown() { 1054 1055 // allow PerfMemory to attempt cleanup of any persistent resources 1056 perfMemory_exit(); 1057 1058 // needs to remove object in file system 1059 AttachListener::abort(); 1060 1061 // flush buffered output, finish log files 1062 ostream_abort(); 1063 1064 // Check for abort hook 1065 abort_hook_t abort_hook = Arguments::abort_hook(); 1066 if (abort_hook != NULL) { 1067 abort_hook(); 1068 } 1069 1070 } 1071 1072 // Note: os::abort() might be called very early during initialization, or 1073 // called from signal handler. Before adding something to os::abort(), make 1074 // sure it is async-safe and can handle partially initialized VM. 1075 void os::abort(bool dump_core, void* siginfo, const void* context) { 1076 os::shutdown(); 1077 if (dump_core) { 1078 #ifndef PRODUCT 1079 fdStream out(defaultStream::output_fd()); 1080 out.print_raw("Current thread is "); 1081 char buf[16]; 1082 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1083 out.print_raw_cr(buf); 1084 out.print_raw_cr("Dumping core ..."); 1085 #endif 1086 ::abort(); // dump core 1087 } 1088 1089 ::exit(1); 1090 } 1091 1092 // Die immediately, no exit hook, no abort hook, no cleanup. 1093 void os::die() { 1094 // _exit() on BsdThreads only kills current thread 1095 ::abort(); 1096 } 1097 1098 // This method is a copy of JDK's sysGetLastErrorString 1099 // from src/solaris/hpi/src/system_md.c 1100 1101 size_t os::lasterror(char *buf, size_t len) { 1102 if (errno == 0) return 0; 1103 1104 const char *s = os::strerror(errno); 1105 size_t n = ::strlen(s); 1106 if (n >= len) { 1107 n = len - 1; 1108 } 1109 ::strncpy(buf, s, n); 1110 buf[n] = '\0'; 1111 return n; 1112 } 1113 1114 // Information of current thread in variety of formats 1115 pid_t os::Bsd::gettid() { 1116 int retval = -1; 1117 1118 #ifdef __APPLE__ //XNU kernel 1119 // despite the fact mach port is actually not a thread id use it 1120 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1121 retval = ::pthread_mach_thread_np(::pthread_self()); 1122 guarantee(retval != 0, "just checking"); 1123 return retval; 1124 1125 #else 1126 #ifdef __FreeBSD__ 1127 retval = syscall(SYS_thr_self); 1128 #else 1129 #ifdef __OpenBSD__ 1130 retval = syscall(SYS_getthrid); 1131 #else 1132 #ifdef __NetBSD__ 1133 retval = (pid_t) syscall(SYS__lwp_self); 1134 #endif 1135 #endif 1136 #endif 1137 #endif 1138 1139 if (retval == -1) { 1140 return getpid(); 1141 } 1142 } 1143 1144 intx os::current_thread_id() { 1145 #ifdef __APPLE__ 1146 return (intx)::pthread_mach_thread_np(::pthread_self()); 1147 #else 1148 return (intx)::pthread_self(); 1149 #endif 1150 } 1151 1152 int os::current_process_id() { 1153 1154 // Under the old bsd thread library, bsd gives each thread 1155 // its own process id. Because of this each thread will return 1156 // a different pid if this method were to return the result 1157 // of getpid(2). Bsd provides no api that returns the pid 1158 // of the launcher thread for the vm. This implementation 1159 // returns a unique pid, the pid of the launcher thread 1160 // that starts the vm 'process'. 1161 1162 // Under the NPTL, getpid() returns the same pid as the 1163 // launcher thread rather than a unique pid per thread. 1164 // Use gettid() if you want the old pre NPTL behaviour. 1165 1166 // if you are looking for the result of a call to getpid() that 1167 // returns a unique pid for the calling thread, then look at the 1168 // OSThread::thread_id() method in osThread_bsd.hpp file 1169 1170 return (int)(_initial_pid ? _initial_pid : getpid()); 1171 } 1172 1173 // DLL functions 1174 1175 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1176 1177 // This must be hard coded because it's the system's temporary 1178 // directory not the java application's temp directory, ala java.io.tmpdir. 1179 #ifdef __APPLE__ 1180 // macosx has a secure per-user temporary directory 1181 char temp_path_storage[PATH_MAX]; 1182 const char* os::get_temp_directory() { 1183 static char *temp_path = NULL; 1184 if (temp_path == NULL) { 1185 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1186 if (pathSize == 0 || pathSize > PATH_MAX) { 1187 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1188 } 1189 temp_path = temp_path_storage; 1190 } 1191 return temp_path; 1192 } 1193 #else // __APPLE__ 1194 const char* os::get_temp_directory() { return "/tmp"; } 1195 #endif // __APPLE__ 1196 1197 // check if addr is inside libjvm.so 1198 bool os::address_is_in_vm(address addr) { 1199 static address libjvm_base_addr; 1200 Dl_info dlinfo; 1201 1202 if (libjvm_base_addr == NULL) { 1203 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1204 libjvm_base_addr = (address)dlinfo.dli_fbase; 1205 } 1206 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1207 } 1208 1209 if (dladdr((void *)addr, &dlinfo) != 0) { 1210 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1211 } 1212 1213 return false; 1214 } 1215 1216 1217 #define MACH_MAXSYMLEN 256 1218 1219 bool os::dll_address_to_function_name(address addr, char *buf, 1220 int buflen, int *offset, 1221 bool demangle) { 1222 // buf is not optional, but offset is optional 1223 assert(buf != NULL, "sanity check"); 1224 1225 Dl_info dlinfo; 1226 char localbuf[MACH_MAXSYMLEN]; 1227 1228 if (dladdr((void*)addr, &dlinfo) != 0) { 1229 // see if we have a matching symbol 1230 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1231 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1232 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1233 } 1234 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1235 return true; 1236 } 1237 // no matching symbol so try for just file info 1238 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1239 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1240 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1241 return true; 1242 } 1243 } 1244 1245 // Handle non-dynamic manually: 1246 if (dlinfo.dli_fbase != NULL && 1247 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1248 dlinfo.dli_fbase)) { 1249 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1250 jio_snprintf(buf, buflen, "%s", localbuf); 1251 } 1252 return true; 1253 } 1254 } 1255 buf[0] = '\0'; 1256 if (offset != NULL) *offset = -1; 1257 return false; 1258 } 1259 1260 // ported from solaris version 1261 bool os::dll_address_to_library_name(address addr, char* buf, 1262 int buflen, int* offset) { 1263 // buf is not optional, but offset is optional 1264 assert(buf != NULL, "sanity check"); 1265 1266 Dl_info dlinfo; 1267 1268 if (dladdr((void*)addr, &dlinfo) != 0) { 1269 if (dlinfo.dli_fname != NULL) { 1270 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1271 } 1272 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1273 *offset = addr - (address)dlinfo.dli_fbase; 1274 } 1275 return true; 1276 } 1277 1278 buf[0] = '\0'; 1279 if (offset) *offset = -1; 1280 return false; 1281 } 1282 1283 // Loads .dll/.so and 1284 // in case of error it checks if .dll/.so was built for the 1285 // same architecture as Hotspot is running on 1286 1287 #ifdef __APPLE__ 1288 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1289 #ifdef STATIC_BUILD 1290 return os::get_default_process_handle(); 1291 #else 1292 void * result= ::dlopen(filename, RTLD_LAZY); 1293 if (result != NULL) { 1294 // Successful loading 1295 return result; 1296 } 1297 1298 // Read system error message into ebuf 1299 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1300 ebuf[ebuflen-1]='\0'; 1301 1302 return NULL; 1303 #endif // STATIC_BUILD 1304 } 1305 #else 1306 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1307 #ifdef STATIC_BUILD 1308 return os::get_default_process_handle(); 1309 #else 1310 void * result= ::dlopen(filename, RTLD_LAZY); 1311 if (result != NULL) { 1312 // Successful loading 1313 return result; 1314 } 1315 1316 Elf32_Ehdr elf_head; 1317 1318 // Read system error message into ebuf 1319 // It may or may not be overwritten below 1320 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1321 ebuf[ebuflen-1]='\0'; 1322 int diag_msg_max_length=ebuflen-strlen(ebuf); 1323 char* diag_msg_buf=ebuf+strlen(ebuf); 1324 1325 if (diag_msg_max_length==0) { 1326 // No more space in ebuf for additional diagnostics message 1327 return NULL; 1328 } 1329 1330 1331 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1332 1333 if (file_descriptor < 0) { 1334 // Can't open library, report dlerror() message 1335 return NULL; 1336 } 1337 1338 bool failed_to_read_elf_head= 1339 (sizeof(elf_head)!= 1340 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1341 1342 ::close(file_descriptor); 1343 if (failed_to_read_elf_head) { 1344 // file i/o error - report dlerror() msg 1345 return NULL; 1346 } 1347 1348 typedef struct { 1349 Elf32_Half code; // Actual value as defined in elf.h 1350 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1351 char elf_class; // 32 or 64 bit 1352 char endianess; // MSB or LSB 1353 char* name; // String representation 1354 } arch_t; 1355 1356 #ifndef EM_486 1357 #define EM_486 6 /* Intel 80486 */ 1358 #endif 1359 1360 #ifndef EM_MIPS_RS3_LE 1361 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1362 #endif 1363 1364 #ifndef EM_PPC64 1365 #define EM_PPC64 21 /* PowerPC64 */ 1366 #endif 1367 1368 #ifndef EM_S390 1369 #define EM_S390 22 /* IBM System/390 */ 1370 #endif 1371 1372 #ifndef EM_IA_64 1373 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1374 #endif 1375 1376 #ifndef EM_X86_64 1377 #define EM_X86_64 62 /* AMD x86-64 */ 1378 #endif 1379 1380 static const arch_t arch_array[]={ 1381 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1382 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1383 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1384 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1385 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1386 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1387 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1388 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1389 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1390 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1391 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1392 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1393 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1394 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1395 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1396 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1397 }; 1398 1399 #if (defined IA32) 1400 static Elf32_Half running_arch_code=EM_386; 1401 #elif (defined AMD64) 1402 static Elf32_Half running_arch_code=EM_X86_64; 1403 #elif (defined IA64) 1404 static Elf32_Half running_arch_code=EM_IA_64; 1405 #elif (defined __sparc) && (defined _LP64) 1406 static Elf32_Half running_arch_code=EM_SPARCV9; 1407 #elif (defined __sparc) && (!defined _LP64) 1408 static Elf32_Half running_arch_code=EM_SPARC; 1409 #elif (defined __powerpc64__) 1410 static Elf32_Half running_arch_code=EM_PPC64; 1411 #elif (defined __powerpc__) 1412 static Elf32_Half running_arch_code=EM_PPC; 1413 #elif (defined ARM) 1414 static Elf32_Half running_arch_code=EM_ARM; 1415 #elif (defined S390) 1416 static Elf32_Half running_arch_code=EM_S390; 1417 #elif (defined ALPHA) 1418 static Elf32_Half running_arch_code=EM_ALPHA; 1419 #elif (defined MIPSEL) 1420 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1421 #elif (defined PARISC) 1422 static Elf32_Half running_arch_code=EM_PARISC; 1423 #elif (defined MIPS) 1424 static Elf32_Half running_arch_code=EM_MIPS; 1425 #elif (defined M68K) 1426 static Elf32_Half running_arch_code=EM_68K; 1427 #else 1428 #error Method os::dll_load requires that one of following is defined:\ 1429 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1430 #endif 1431 1432 // Identify compatability class for VM's architecture and library's architecture 1433 // Obtain string descriptions for architectures 1434 1435 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1436 int running_arch_index=-1; 1437 1438 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1439 if (running_arch_code == arch_array[i].code) { 1440 running_arch_index = i; 1441 } 1442 if (lib_arch.code == arch_array[i].code) { 1443 lib_arch.compat_class = arch_array[i].compat_class; 1444 lib_arch.name = arch_array[i].name; 1445 } 1446 } 1447 1448 assert(running_arch_index != -1, 1449 "Didn't find running architecture code (running_arch_code) in arch_array"); 1450 if (running_arch_index == -1) { 1451 // Even though running architecture detection failed 1452 // we may still continue with reporting dlerror() message 1453 return NULL; 1454 } 1455 1456 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1457 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1458 return NULL; 1459 } 1460 1461 #ifndef S390 1462 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1463 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1464 return NULL; 1465 } 1466 #endif // !S390 1467 1468 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1469 if (lib_arch.name!=NULL) { 1470 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1471 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1472 lib_arch.name, arch_array[running_arch_index].name); 1473 } else { 1474 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1475 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1476 lib_arch.code, 1477 arch_array[running_arch_index].name); 1478 } 1479 } 1480 1481 return NULL; 1482 #endif // STATIC_BUILD 1483 } 1484 #endif // !__APPLE__ 1485 1486 void* os::get_default_process_handle() { 1487 #ifdef __APPLE__ 1488 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1489 // to avoid finding unexpected symbols on second (or later) 1490 // loads of a library. 1491 return (void*)::dlopen(NULL, RTLD_FIRST); 1492 #else 1493 return (void*)::dlopen(NULL, RTLD_LAZY); 1494 #endif 1495 } 1496 1497 // XXX: Do we need a lock around this as per Linux? 1498 void* os::dll_lookup(void* handle, const char* name) { 1499 return dlsym(handle, name); 1500 } 1501 1502 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1503 outputStream * out = (outputStream *) param; 1504 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name); 1505 return 0; 1506 } 1507 1508 void os::print_dll_info(outputStream *st) { 1509 st->print_cr("Dynamic libraries:"); 1510 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1511 st->print_cr("Error: Cannot print dynamic libraries."); 1512 } 1513 } 1514 1515 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1516 #ifdef RTLD_DI_LINKMAP 1517 Dl_info dli; 1518 void *handle; 1519 Link_map *map; 1520 Link_map *p; 1521 1522 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1523 dli.dli_fname == NULL) { 1524 return 1; 1525 } 1526 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1527 if (handle == NULL) { 1528 return 1; 1529 } 1530 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1531 if (map == NULL) { 1532 dlclose(handle); 1533 return 1; 1534 } 1535 1536 while (map->l_prev != NULL) 1537 map = map->l_prev; 1538 1539 while (map != NULL) { 1540 // Value for top_address is returned as 0 since we don't have any information about module size 1541 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1542 dlclose(handle); 1543 return 1; 1544 } 1545 map = map->l_next; 1546 } 1547 1548 dlclose(handle); 1549 #elif defined(__APPLE__) 1550 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1551 // Value for top_address is returned as 0 since we don't have any information about module size 1552 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1553 return 1; 1554 } 1555 } 1556 return 0; 1557 #else 1558 return 1; 1559 #endif 1560 } 1561 1562 void os::get_summary_os_info(char* buf, size_t buflen) { 1563 // These buffers are small because we want this to be brief 1564 // and not use a lot of stack while generating the hs_err file. 1565 char os[100]; 1566 size_t size = sizeof(os); 1567 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1568 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1569 #ifdef __APPLE__ 1570 strncpy(os, "Darwin", sizeof(os)); 1571 #elif __OpenBSD__ 1572 strncpy(os, "OpenBSD", sizeof(os)); 1573 #else 1574 strncpy(os, "BSD", sizeof(os)); 1575 #endif 1576 } 1577 1578 char release[100]; 1579 size = sizeof(release); 1580 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1581 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1582 // if error, leave blank 1583 strncpy(release, "", sizeof(release)); 1584 } 1585 snprintf(buf, buflen, "%s %s", os, release); 1586 } 1587 1588 void os::print_os_info_brief(outputStream* st) { 1589 os::Posix::print_uname_info(st); 1590 } 1591 1592 void os::print_os_info(outputStream* st) { 1593 st->print("OS:"); 1594 1595 os::Posix::print_uname_info(st); 1596 1597 os::Posix::print_rlimit_info(st); 1598 1599 os::Posix::print_load_average(st); 1600 } 1601 1602 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1603 // Nothing to do for now. 1604 } 1605 1606 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1607 unsigned int mhz; 1608 size_t size = sizeof(mhz); 1609 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1610 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1611 mhz = 1; // looks like an error but can be divided by 1612 } else { 1613 mhz /= 1000000; // reported in millions 1614 } 1615 1616 char model[100]; 1617 size = sizeof(model); 1618 int mib_model[] = { CTL_HW, HW_MODEL }; 1619 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1620 strncpy(model, cpu_arch, sizeof(model)); 1621 } 1622 1623 char machine[100]; 1624 size = sizeof(machine); 1625 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1626 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1627 strncpy(machine, "", sizeof(machine)); 1628 } 1629 1630 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1631 } 1632 1633 void os::print_memory_info(outputStream* st) { 1634 1635 st->print("Memory:"); 1636 st->print(" %dk page", os::vm_page_size()>>10); 1637 1638 st->print(", physical " UINT64_FORMAT "k", 1639 os::physical_memory() >> 10); 1640 st->print("(" UINT64_FORMAT "k free)", 1641 os::available_memory() >> 10); 1642 st->cr(); 1643 } 1644 1645 static void print_signal_handler(outputStream* st, int sig, 1646 char* buf, size_t buflen); 1647 1648 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1649 st->print_cr("Signal Handlers:"); 1650 print_signal_handler(st, SIGSEGV, buf, buflen); 1651 print_signal_handler(st, SIGBUS , buf, buflen); 1652 print_signal_handler(st, SIGFPE , buf, buflen); 1653 print_signal_handler(st, SIGPIPE, buf, buflen); 1654 print_signal_handler(st, SIGXFSZ, buf, buflen); 1655 print_signal_handler(st, SIGILL , buf, buflen); 1656 print_signal_handler(st, SR_signum, buf, buflen); 1657 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1658 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1659 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1660 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1661 } 1662 1663 static char saved_jvm_path[MAXPATHLEN] = {0}; 1664 1665 // Find the full path to the current module, libjvm 1666 void os::jvm_path(char *buf, jint buflen) { 1667 // Error checking. 1668 if (buflen < MAXPATHLEN) { 1669 assert(false, "must use a large-enough buffer"); 1670 buf[0] = '\0'; 1671 return; 1672 } 1673 // Lazy resolve the path to current module. 1674 if (saved_jvm_path[0] != 0) { 1675 strcpy(buf, saved_jvm_path); 1676 return; 1677 } 1678 1679 char dli_fname[MAXPATHLEN]; 1680 bool ret = dll_address_to_library_name( 1681 CAST_FROM_FN_PTR(address, os::jvm_path), 1682 dli_fname, sizeof(dli_fname), NULL); 1683 assert(ret, "cannot locate libjvm"); 1684 char *rp = NULL; 1685 if (ret && dli_fname[0] != '\0') { 1686 rp = os::Posix::realpath(dli_fname, buf, buflen); 1687 } 1688 if (rp == NULL) { 1689 return; 1690 } 1691 1692 if (Arguments::sun_java_launcher_is_altjvm()) { 1693 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1694 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1695 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1696 // appears at the right place in the string, then assume we are 1697 // installed in a JDK and we're done. Otherwise, check for a 1698 // JAVA_HOME environment variable and construct a path to the JVM 1699 // being overridden. 1700 1701 const char *p = buf + strlen(buf) - 1; 1702 for (int count = 0; p > buf && count < 5; ++count) { 1703 for (--p; p > buf && *p != '/'; --p) 1704 /* empty */ ; 1705 } 1706 1707 if (strncmp(p, "/jre/lib/", 9) != 0) { 1708 // Look for JAVA_HOME in the environment. 1709 char* java_home_var = ::getenv("JAVA_HOME"); 1710 if (java_home_var != NULL && java_home_var[0] != 0) { 1711 char* jrelib_p; 1712 int len; 1713 1714 // Check the current module name "libjvm" 1715 p = strrchr(buf, '/'); 1716 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1717 1718 rp = os::Posix::realpath(java_home_var, buf, buflen); 1719 if (rp == NULL) { 1720 return; 1721 } 1722 1723 // determine if this is a legacy image or modules image 1724 // modules image doesn't have "jre" subdirectory 1725 len = strlen(buf); 1726 assert(len < buflen, "Ran out of buffer space"); 1727 jrelib_p = buf + len; 1728 1729 // Add the appropriate library subdir 1730 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1731 if (0 != access(buf, F_OK)) { 1732 snprintf(jrelib_p, buflen-len, "/lib"); 1733 } 1734 1735 // Add the appropriate client or server subdir 1736 len = strlen(buf); 1737 jrelib_p = buf + len; 1738 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1739 if (0 != access(buf, F_OK)) { 1740 snprintf(jrelib_p, buflen-len, "%s", ""); 1741 } 1742 1743 // If the path exists within JAVA_HOME, add the JVM library name 1744 // to complete the path to JVM being overridden. Otherwise fallback 1745 // to the path to the current library. 1746 if (0 == access(buf, F_OK)) { 1747 // Use current module name "libjvm" 1748 len = strlen(buf); 1749 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1750 } else { 1751 // Fall back to path of current library 1752 rp = os::Posix::realpath(dli_fname, buf, buflen); 1753 if (rp == NULL) { 1754 return; 1755 } 1756 } 1757 } 1758 } 1759 } 1760 1761 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1762 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1763 } 1764 1765 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1766 // no prefix required, not even "_" 1767 } 1768 1769 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1770 // no suffix required 1771 } 1772 1773 //////////////////////////////////////////////////////////////////////////////// 1774 // sun.misc.Signal support 1775 1776 static volatile jint sigint_count = 0; 1777 1778 static void UserHandler(int sig, void *siginfo, void *context) { 1779 // 4511530 - sem_post is serialized and handled by the manager thread. When 1780 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1781 // don't want to flood the manager thread with sem_post requests. 1782 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1783 return; 1784 } 1785 1786 // Ctrl-C is pressed during error reporting, likely because the error 1787 // handler fails to abort. Let VM die immediately. 1788 if (sig == SIGINT && VMError::is_error_reported()) { 1789 os::die(); 1790 } 1791 1792 os::signal_notify(sig); 1793 } 1794 1795 void* os::user_handler() { 1796 return CAST_FROM_FN_PTR(void*, UserHandler); 1797 } 1798 1799 extern "C" { 1800 typedef void (*sa_handler_t)(int); 1801 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1802 } 1803 1804 void* os::signal(int signal_number, void* handler) { 1805 struct sigaction sigAct, oldSigAct; 1806 1807 sigfillset(&(sigAct.sa_mask)); 1808 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1809 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1810 1811 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1812 // -1 means registration failed 1813 return (void *)-1; 1814 } 1815 1816 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1817 } 1818 1819 void os::signal_raise(int signal_number) { 1820 ::raise(signal_number); 1821 } 1822 1823 // The following code is moved from os.cpp for making this 1824 // code platform specific, which it is by its very nature. 1825 1826 // Will be modified when max signal is changed to be dynamic 1827 int os::sigexitnum_pd() { 1828 return NSIG; 1829 } 1830 1831 // a counter for each possible signal value 1832 static volatile jint pending_signals[NSIG+1] = { 0 }; 1833 1834 // Bsd(POSIX) specific hand shaking semaphore. 1835 #ifdef __APPLE__ 1836 typedef semaphore_t os_semaphore_t; 1837 1838 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1839 #define SEM_WAIT(sem) semaphore_wait(sem) 1840 #define SEM_POST(sem) semaphore_signal(sem) 1841 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1842 #else 1843 typedef sem_t os_semaphore_t; 1844 1845 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1846 #define SEM_WAIT(sem) sem_wait(&sem) 1847 #define SEM_POST(sem) sem_post(&sem) 1848 #define SEM_DESTROY(sem) sem_destroy(&sem) 1849 #endif 1850 1851 #ifdef __APPLE__ 1852 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. 1853 1854 static const char* sem_init_strerror(kern_return_t value) { 1855 switch (value) { 1856 case KERN_INVALID_ARGUMENT: return "Invalid argument"; 1857 case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; 1858 default: return "Unknown"; 1859 } 1860 } 1861 1862 OSXSemaphore::OSXSemaphore(uint value) { 1863 kern_return_t ret = SEM_INIT(_semaphore, value); 1864 1865 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); 1866 } 1867 1868 OSXSemaphore::~OSXSemaphore() { 1869 SEM_DESTROY(_semaphore); 1870 } 1871 1872 void OSXSemaphore::signal(uint count) { 1873 for (uint i = 0; i < count; i++) { 1874 kern_return_t ret = SEM_POST(_semaphore); 1875 1876 assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); 1877 } 1878 } 1879 1880 void OSXSemaphore::wait() { 1881 kern_return_t ret; 1882 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) { 1883 // Semaphore was interrupted. Retry. 1884 } 1885 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); 1886 } 1887 1888 jlong OSXSemaphore::currenttime() { 1889 struct timeval tv; 1890 gettimeofday(&tv, NULL); 1891 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1892 } 1893 1894 bool OSXSemaphore::trywait() { 1895 return timedwait(0, 0); 1896 } 1897 1898 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { 1899 kern_return_t kr = KERN_ABORTED; 1900 mach_timespec_t waitspec; 1901 waitspec.tv_sec = sec; 1902 waitspec.tv_nsec = nsec; 1903 1904 jlong starttime = currenttime(); 1905 1906 kr = semaphore_timedwait(_semaphore, waitspec); 1907 while (kr == KERN_ABORTED) { 1908 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1909 1910 jlong current = currenttime(); 1911 jlong passedtime = current - starttime; 1912 1913 if (passedtime >= totalwait) { 1914 waitspec.tv_sec = 0; 1915 waitspec.tv_nsec = 0; 1916 } else { 1917 jlong waittime = totalwait - (current - starttime); 1918 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1919 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1920 } 1921 1922 kr = semaphore_timedwait(_semaphore, waitspec); 1923 } 1924 1925 return kr == KERN_SUCCESS; 1926 } 1927 1928 #else 1929 // Use POSIX implementation of semaphores. 1930 1931 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 1932 struct timespec ts; 1933 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 1934 1935 return ts; 1936 } 1937 1938 #endif // __APPLE__ 1939 1940 static os_semaphore_t sig_sem; 1941 1942 #ifdef __APPLE__ 1943 static OSXSemaphore sr_semaphore; 1944 #else 1945 static PosixSemaphore sr_semaphore; 1946 #endif 1947 1948 void os::signal_init_pd() { 1949 // Initialize signal structures 1950 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1951 1952 // Initialize signal semaphore 1953 ::SEM_INIT(sig_sem, 0); 1954 } 1955 1956 void os::signal_notify(int sig) { 1957 Atomic::inc(&pending_signals[sig]); 1958 ::SEM_POST(sig_sem); 1959 } 1960 1961 static int check_pending_signals(bool wait) { 1962 Atomic::store(0, &sigint_count); 1963 for (;;) { 1964 for (int i = 0; i < NSIG + 1; i++) { 1965 jint n = pending_signals[i]; 1966 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1967 return i; 1968 } 1969 } 1970 if (!wait) { 1971 return -1; 1972 } 1973 JavaThread *thread = JavaThread::current(); 1974 ThreadBlockInVM tbivm(thread); 1975 1976 bool threadIsSuspended; 1977 do { 1978 thread->set_suspend_equivalent(); 1979 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1980 ::SEM_WAIT(sig_sem); 1981 1982 // were we externally suspended while we were waiting? 1983 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1984 if (threadIsSuspended) { 1985 // The semaphore has been incremented, but while we were waiting 1986 // another thread suspended us. We don't want to continue running 1987 // while suspended because that would surprise the thread that 1988 // suspended us. 1989 ::SEM_POST(sig_sem); 1990 1991 thread->java_suspend_self(); 1992 } 1993 } while (threadIsSuspended); 1994 } 1995 } 1996 1997 int os::signal_lookup() { 1998 return check_pending_signals(false); 1999 } 2000 2001 int os::signal_wait() { 2002 return check_pending_signals(true); 2003 } 2004 2005 //////////////////////////////////////////////////////////////////////////////// 2006 // Virtual Memory 2007 2008 int os::vm_page_size() { 2009 // Seems redundant as all get out 2010 assert(os::Bsd::page_size() != -1, "must call os::init"); 2011 return os::Bsd::page_size(); 2012 } 2013 2014 // Solaris allocates memory by pages. 2015 int os::vm_allocation_granularity() { 2016 assert(os::Bsd::page_size() != -1, "must call os::init"); 2017 return os::Bsd::page_size(); 2018 } 2019 2020 // Rationale behind this function: 2021 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2022 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2023 // samples for JITted code. Here we create private executable mapping over the code cache 2024 // and then we can use standard (well, almost, as mapping can change) way to provide 2025 // info for the reporting script by storing timestamp and location of symbol 2026 void bsd_wrap_code(char* base, size_t size) { 2027 static volatile jint cnt = 0; 2028 2029 if (!UseOprofile) { 2030 return; 2031 } 2032 2033 char buf[PATH_MAX + 1]; 2034 int num = Atomic::add(1, &cnt); 2035 2036 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2037 os::get_temp_directory(), os::current_process_id(), num); 2038 unlink(buf); 2039 2040 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2041 2042 if (fd != -1) { 2043 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2044 if (rv != (off_t)-1) { 2045 if (::write(fd, "", 1) == 1) { 2046 mmap(base, size, 2047 PROT_READ|PROT_WRITE|PROT_EXEC, 2048 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2049 } 2050 } 2051 ::close(fd); 2052 unlink(buf); 2053 } 2054 } 2055 2056 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2057 int err) { 2058 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT 2059 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec, 2060 os::errno_name(err), err); 2061 } 2062 2063 // NOTE: Bsd kernel does not really reserve the pages for us. 2064 // All it does is to check if there are enough free pages 2065 // left at the time of mmap(). This could be a potential 2066 // problem. 2067 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2068 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2069 #ifdef __OpenBSD__ 2070 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2071 if (::mprotect(addr, size, prot) == 0) { 2072 return true; 2073 } 2074 #else 2075 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2076 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2077 if (res != (uintptr_t) MAP_FAILED) { 2078 return true; 2079 } 2080 #endif 2081 2082 // Warn about any commit errors we see in non-product builds just 2083 // in case mmap() doesn't work as described on the man page. 2084 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2085 2086 return false; 2087 } 2088 2089 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2090 bool exec) { 2091 // alignment_hint is ignored on this OS 2092 return pd_commit_memory(addr, size, exec); 2093 } 2094 2095 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2096 const char* mesg) { 2097 assert(mesg != NULL, "mesg must be specified"); 2098 if (!pd_commit_memory(addr, size, exec)) { 2099 // add extra info in product mode for vm_exit_out_of_memory(): 2100 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2101 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2102 } 2103 } 2104 2105 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2106 size_t alignment_hint, bool exec, 2107 const char* mesg) { 2108 // alignment_hint is ignored on this OS 2109 pd_commit_memory_or_exit(addr, size, exec, mesg); 2110 } 2111 2112 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2113 } 2114 2115 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2116 ::madvise(addr, bytes, MADV_DONTNEED); 2117 } 2118 2119 void os::numa_make_global(char *addr, size_t bytes) { 2120 } 2121 2122 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2123 } 2124 2125 bool os::numa_topology_changed() { return false; } 2126 2127 size_t os::numa_get_groups_num() { 2128 return 1; 2129 } 2130 2131 int os::numa_get_group_id() { 2132 return 0; 2133 } 2134 2135 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2136 if (size > 0) { 2137 ids[0] = 0; 2138 return 1; 2139 } 2140 return 0; 2141 } 2142 2143 bool os::get_page_info(char *start, page_info* info) { 2144 return false; 2145 } 2146 2147 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2148 return end; 2149 } 2150 2151 2152 bool os::pd_uncommit_memory(char* addr, size_t size) { 2153 #ifdef __OpenBSD__ 2154 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2155 return ::mprotect(addr, size, PROT_NONE) == 0; 2156 #else 2157 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2158 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2159 return res != (uintptr_t) MAP_FAILED; 2160 #endif 2161 } 2162 2163 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2164 return os::commit_memory(addr, size, !ExecMem); 2165 } 2166 2167 // If this is a growable mapping, remove the guard pages entirely by 2168 // munmap()ping them. If not, just call uncommit_memory(). 2169 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2170 return os::uncommit_memory(addr, size); 2171 } 2172 2173 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2174 // at 'requested_addr'. If there are existing memory mappings at the same 2175 // location, however, they will be overwritten. If 'fixed' is false, 2176 // 'requested_addr' is only treated as a hint, the return value may or 2177 // may not start from the requested address. Unlike Bsd mmap(), this 2178 // function returns NULL to indicate failure. 2179 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2180 char * addr; 2181 int flags; 2182 2183 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2184 if (fixed) { 2185 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2186 flags |= MAP_FIXED; 2187 } 2188 2189 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2190 // touch an uncommitted page. Otherwise, the read/write might 2191 // succeed if we have enough swap space to back the physical page. 2192 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2193 flags, -1, 0); 2194 2195 return addr == MAP_FAILED ? NULL : addr; 2196 } 2197 2198 static int anon_munmap(char * addr, size_t size) { 2199 return ::munmap(addr, size) == 0; 2200 } 2201 2202 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2203 size_t alignment_hint) { 2204 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2205 } 2206 2207 bool os::pd_release_memory(char* addr, size_t size) { 2208 return anon_munmap(addr, size); 2209 } 2210 2211 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2212 // Bsd wants the mprotect address argument to be page aligned. 2213 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size()); 2214 2215 // According to SUSv3, mprotect() should only be used with mappings 2216 // established by mmap(), and mmap() always maps whole pages. Unaligned 2217 // 'addr' likely indicates problem in the VM (e.g. trying to change 2218 // protection of malloc'ed or statically allocated memory). Check the 2219 // caller if you hit this assert. 2220 assert(addr == bottom, "sanity check"); 2221 2222 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2223 return ::mprotect(bottom, size, prot) == 0; 2224 } 2225 2226 // Set protections specified 2227 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2228 bool is_committed) { 2229 unsigned int p = 0; 2230 switch (prot) { 2231 case MEM_PROT_NONE: p = PROT_NONE; break; 2232 case MEM_PROT_READ: p = PROT_READ; break; 2233 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2234 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2235 default: 2236 ShouldNotReachHere(); 2237 } 2238 // is_committed is unused. 2239 return bsd_mprotect(addr, bytes, p); 2240 } 2241 2242 bool os::guard_memory(char* addr, size_t size) { 2243 return bsd_mprotect(addr, size, PROT_NONE); 2244 } 2245 2246 bool os::unguard_memory(char* addr, size_t size) { 2247 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2248 } 2249 2250 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2251 return false; 2252 } 2253 2254 // Large page support 2255 2256 static size_t _large_page_size = 0; 2257 2258 void os::large_page_init() { 2259 } 2260 2261 2262 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2263 fatal("This code is not used or maintained."); 2264 2265 // "exec" is passed in but not used. Creating the shared image for 2266 // the code cache doesn't have an SHM_X executable permission to check. 2267 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2268 2269 key_t key = IPC_PRIVATE; 2270 char *addr; 2271 2272 bool warn_on_failure = UseLargePages && 2273 (!FLAG_IS_DEFAULT(UseLargePages) || 2274 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2275 2276 // Create a large shared memory region to attach to based on size. 2277 // Currently, size is the total size of the heap 2278 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2279 if (shmid == -1) { 2280 // Possible reasons for shmget failure: 2281 // 1. shmmax is too small for Java heap. 2282 // > check shmmax value: cat /proc/sys/kernel/shmmax 2283 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2284 // 2. not enough large page memory. 2285 // > check available large pages: cat /proc/meminfo 2286 // > increase amount of large pages: 2287 // echo new_value > /proc/sys/vm/nr_hugepages 2288 // Note 1: different Bsd may use different name for this property, 2289 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2290 // Note 2: it's possible there's enough physical memory available but 2291 // they are so fragmented after a long run that they can't 2292 // coalesce into large pages. Try to reserve large pages when 2293 // the system is still "fresh". 2294 if (warn_on_failure) { 2295 warning("Failed to reserve shared memory (errno = %d).", errno); 2296 } 2297 return NULL; 2298 } 2299 2300 // attach to the region 2301 addr = (char*)shmat(shmid, req_addr, 0); 2302 int err = errno; 2303 2304 // Remove shmid. If shmat() is successful, the actual shared memory segment 2305 // will be deleted when it's detached by shmdt() or when the process 2306 // terminates. If shmat() is not successful this will remove the shared 2307 // segment immediately. 2308 shmctl(shmid, IPC_RMID, NULL); 2309 2310 if ((intptr_t)addr == -1) { 2311 if (warn_on_failure) { 2312 warning("Failed to attach shared memory (errno = %d).", err); 2313 } 2314 return NULL; 2315 } 2316 2317 // The memory is committed 2318 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2319 2320 return addr; 2321 } 2322 2323 bool os::release_memory_special(char* base, size_t bytes) { 2324 if (MemTracker::tracking_level() > NMT_minimal) { 2325 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2326 // detaching the SHM segment will also delete it, see reserve_memory_special() 2327 int rslt = shmdt(base); 2328 if (rslt == 0) { 2329 tkr.record((address)base, bytes); 2330 return true; 2331 } else { 2332 return false; 2333 } 2334 } else { 2335 return shmdt(base) == 0; 2336 } 2337 } 2338 2339 size_t os::large_page_size() { 2340 return _large_page_size; 2341 } 2342 2343 // HugeTLBFS allows application to commit large page memory on demand; 2344 // with SysV SHM the entire memory region must be allocated as shared 2345 // memory. 2346 bool os::can_commit_large_page_memory() { 2347 return UseHugeTLBFS; 2348 } 2349 2350 bool os::can_execute_large_page_memory() { 2351 return UseHugeTLBFS; 2352 } 2353 2354 // Reserve memory at an arbitrary address, only if that area is 2355 // available (and not reserved for something else). 2356 2357 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2358 const int max_tries = 10; 2359 char* base[max_tries]; 2360 size_t size[max_tries]; 2361 const size_t gap = 0x000000; 2362 2363 // Assert only that the size is a multiple of the page size, since 2364 // that's all that mmap requires, and since that's all we really know 2365 // about at this low abstraction level. If we need higher alignment, 2366 // we can either pass an alignment to this method or verify alignment 2367 // in one of the methods further up the call chain. See bug 5044738. 2368 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2369 2370 // Repeatedly allocate blocks until the block is allocated at the 2371 // right spot. 2372 2373 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2374 // if kernel honors the hint then we can return immediately. 2375 char * addr = anon_mmap(requested_addr, bytes, false); 2376 if (addr == requested_addr) { 2377 return requested_addr; 2378 } 2379 2380 if (addr != NULL) { 2381 // mmap() is successful but it fails to reserve at the requested address 2382 anon_munmap(addr, bytes); 2383 } 2384 2385 int i; 2386 for (i = 0; i < max_tries; ++i) { 2387 base[i] = reserve_memory(bytes); 2388 2389 if (base[i] != NULL) { 2390 // Is this the block we wanted? 2391 if (base[i] == requested_addr) { 2392 size[i] = bytes; 2393 break; 2394 } 2395 2396 // Does this overlap the block we wanted? Give back the overlapped 2397 // parts and try again. 2398 2399 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2400 if (top_overlap >= 0 && top_overlap < bytes) { 2401 unmap_memory(base[i], top_overlap); 2402 base[i] += top_overlap; 2403 size[i] = bytes - top_overlap; 2404 } else { 2405 size_t bottom_overlap = base[i] + bytes - requested_addr; 2406 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2407 unmap_memory(requested_addr, bottom_overlap); 2408 size[i] = bytes - bottom_overlap; 2409 } else { 2410 size[i] = bytes; 2411 } 2412 } 2413 } 2414 } 2415 2416 // Give back the unused reserved pieces. 2417 2418 for (int j = 0; j < i; ++j) { 2419 if (base[j] != NULL) { 2420 unmap_memory(base[j], size[j]); 2421 } 2422 } 2423 2424 if (i < max_tries) { 2425 return requested_addr; 2426 } else { 2427 return NULL; 2428 } 2429 } 2430 2431 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2432 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2433 } 2434 2435 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2436 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2437 } 2438 2439 void os::naked_short_sleep(jlong ms) { 2440 struct timespec req; 2441 2442 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2443 req.tv_sec = 0; 2444 if (ms > 0) { 2445 req.tv_nsec = (ms % 1000) * 1000000; 2446 } else { 2447 req.tv_nsec = 1; 2448 } 2449 2450 nanosleep(&req, NULL); 2451 2452 return; 2453 } 2454 2455 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2456 void os::infinite_sleep() { 2457 while (true) { // sleep forever ... 2458 ::sleep(100); // ... 100 seconds at a time 2459 } 2460 } 2461 2462 // Used to convert frequent JVM_Yield() to nops 2463 bool os::dont_yield() { 2464 return DontYieldALot; 2465 } 2466 2467 void os::naked_yield() { 2468 sched_yield(); 2469 } 2470 2471 //////////////////////////////////////////////////////////////////////////////// 2472 // thread priority support 2473 2474 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2475 // only supports dynamic priority, static priority must be zero. For real-time 2476 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2477 // However, for large multi-threaded applications, SCHED_RR is not only slower 2478 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2479 // of 5 runs - Sep 2005). 2480 // 2481 // The following code actually changes the niceness of kernel-thread/LWP. It 2482 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2483 // not the entire user process, and user level threads are 1:1 mapped to kernel 2484 // threads. It has always been the case, but could change in the future. For 2485 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2486 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2487 2488 #if !defined(__APPLE__) 2489 int os::java_to_os_priority[CriticalPriority + 1] = { 2490 19, // 0 Entry should never be used 2491 2492 0, // 1 MinPriority 2493 3, // 2 2494 6, // 3 2495 2496 10, // 4 2497 15, // 5 NormPriority 2498 18, // 6 2499 2500 21, // 7 2501 25, // 8 2502 28, // 9 NearMaxPriority 2503 2504 31, // 10 MaxPriority 2505 2506 31 // 11 CriticalPriority 2507 }; 2508 #else 2509 // Using Mach high-level priority assignments 2510 int os::java_to_os_priority[CriticalPriority + 1] = { 2511 0, // 0 Entry should never be used (MINPRI_USER) 2512 2513 27, // 1 MinPriority 2514 28, // 2 2515 29, // 3 2516 2517 30, // 4 2518 31, // 5 NormPriority (BASEPRI_DEFAULT) 2519 32, // 6 2520 2521 33, // 7 2522 34, // 8 2523 35, // 9 NearMaxPriority 2524 2525 36, // 10 MaxPriority 2526 2527 36 // 11 CriticalPriority 2528 }; 2529 #endif 2530 2531 static int prio_init() { 2532 if (ThreadPriorityPolicy == 1) { 2533 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2534 // if effective uid is not root. Perhaps, a more elegant way of doing 2535 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2536 if (geteuid() != 0) { 2537 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2538 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2539 } 2540 ThreadPriorityPolicy = 0; 2541 } 2542 } 2543 if (UseCriticalJavaThreadPriority) { 2544 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2545 } 2546 return 0; 2547 } 2548 2549 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2550 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2551 2552 #ifdef __OpenBSD__ 2553 // OpenBSD pthread_setprio starves low priority threads 2554 return OS_OK; 2555 #elif defined(__FreeBSD__) 2556 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2557 #elif defined(__APPLE__) || defined(__NetBSD__) 2558 struct sched_param sp; 2559 int policy; 2560 pthread_t self = pthread_self(); 2561 2562 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2563 return OS_ERR; 2564 } 2565 2566 sp.sched_priority = newpri; 2567 if (pthread_setschedparam(self, policy, &sp) != 0) { 2568 return OS_ERR; 2569 } 2570 2571 return OS_OK; 2572 #else 2573 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2574 return (ret == 0) ? OS_OK : OS_ERR; 2575 #endif 2576 } 2577 2578 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2579 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2580 *priority_ptr = java_to_os_priority[NormPriority]; 2581 return OS_OK; 2582 } 2583 2584 errno = 0; 2585 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2586 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2587 #elif defined(__APPLE__) || defined(__NetBSD__) 2588 int policy; 2589 struct sched_param sp; 2590 2591 pthread_getschedparam(pthread_self(), &policy, &sp); 2592 *priority_ptr = sp.sched_priority; 2593 #else 2594 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2595 #endif 2596 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2597 } 2598 2599 // Hint to the underlying OS that a task switch would not be good. 2600 // Void return because it's a hint and can fail. 2601 void os::hint_no_preempt() {} 2602 2603 //////////////////////////////////////////////////////////////////////////////// 2604 // suspend/resume support 2605 2606 // The low-level signal-based suspend/resume support is a remnant from the 2607 // old VM-suspension that used to be for java-suspension, safepoints etc, 2608 // within hotspot. Currently used by JFR's OSThreadSampler 2609 // 2610 // The remaining code is greatly simplified from the more general suspension 2611 // code that used to be used. 2612 // 2613 // The protocol is quite simple: 2614 // - suspend: 2615 // - sends a signal to the target thread 2616 // - polls the suspend state of the osthread using a yield loop 2617 // - target thread signal handler (SR_handler) sets suspend state 2618 // and blocks in sigsuspend until continued 2619 // - resume: 2620 // - sets target osthread state to continue 2621 // - sends signal to end the sigsuspend loop in the SR_handler 2622 // 2623 // Note that the SR_lock plays no role in this suspend/resume protocol, 2624 // but is checked for NULL in SR_handler as a thread termination indicator. 2625 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2626 // 2627 // Note that resume_clear_context() and suspend_save_context() are needed 2628 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2629 // which in part is used by: 2630 // - Forte Analyzer: AsyncGetCallTrace() 2631 // - StackBanging: get_frame_at_stack_banging_point() 2632 2633 static void resume_clear_context(OSThread *osthread) { 2634 osthread->set_ucontext(NULL); 2635 osthread->set_siginfo(NULL); 2636 } 2637 2638 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2639 osthread->set_ucontext(context); 2640 osthread->set_siginfo(siginfo); 2641 } 2642 2643 // Handler function invoked when a thread's execution is suspended or 2644 // resumed. We have to be careful that only async-safe functions are 2645 // called here (Note: most pthread functions are not async safe and 2646 // should be avoided.) 2647 // 2648 // Note: sigwait() is a more natural fit than sigsuspend() from an 2649 // interface point of view, but sigwait() prevents the signal hander 2650 // from being run. libpthread would get very confused by not having 2651 // its signal handlers run and prevents sigwait()'s use with the 2652 // mutex granting granting signal. 2653 // 2654 // Currently only ever called on the VMThread or JavaThread 2655 // 2656 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2657 // Save and restore errno to avoid confusing native code with EINTR 2658 // after sigsuspend. 2659 int old_errno = errno; 2660 2661 Thread* thread = Thread::current_or_null_safe(); 2662 assert(thread != NULL, "Missing current thread in SR_handler"); 2663 2664 // On some systems we have seen signal delivery get "stuck" until the signal 2665 // mask is changed as part of thread termination. Check that the current thread 2666 // has not already terminated (via SR_lock()) - else the following assertion 2667 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2668 // destructor has completed. 2669 2670 if (thread->SR_lock() == NULL) { 2671 return; 2672 } 2673 2674 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2675 2676 OSThread* osthread = thread->osthread(); 2677 2678 os::SuspendResume::State current = osthread->sr.state(); 2679 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2680 suspend_save_context(osthread, siginfo, context); 2681 2682 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2683 os::SuspendResume::State state = osthread->sr.suspended(); 2684 if (state == os::SuspendResume::SR_SUSPENDED) { 2685 sigset_t suspend_set; // signals for sigsuspend() 2686 2687 // get current set of blocked signals and unblock resume signal 2688 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2689 sigdelset(&suspend_set, SR_signum); 2690 2691 sr_semaphore.signal(); 2692 // wait here until we are resumed 2693 while (1) { 2694 sigsuspend(&suspend_set); 2695 2696 os::SuspendResume::State result = osthread->sr.running(); 2697 if (result == os::SuspendResume::SR_RUNNING) { 2698 sr_semaphore.signal(); 2699 break; 2700 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2701 ShouldNotReachHere(); 2702 } 2703 } 2704 2705 } else if (state == os::SuspendResume::SR_RUNNING) { 2706 // request was cancelled, continue 2707 } else { 2708 ShouldNotReachHere(); 2709 } 2710 2711 resume_clear_context(osthread); 2712 } else if (current == os::SuspendResume::SR_RUNNING) { 2713 // request was cancelled, continue 2714 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2715 // ignore 2716 } else { 2717 // ignore 2718 } 2719 2720 errno = old_errno; 2721 } 2722 2723 2724 static int SR_initialize() { 2725 struct sigaction act; 2726 char *s; 2727 // Get signal number to use for suspend/resume 2728 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2729 int sig = ::strtol(s, 0, 10); 2730 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2731 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2732 SR_signum = sig; 2733 } else { 2734 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2735 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2736 } 2737 } 2738 2739 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2740 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2741 2742 sigemptyset(&SR_sigset); 2743 sigaddset(&SR_sigset, SR_signum); 2744 2745 // Set up signal handler for suspend/resume 2746 act.sa_flags = SA_RESTART|SA_SIGINFO; 2747 act.sa_handler = (void (*)(int)) SR_handler; 2748 2749 // SR_signum is blocked by default. 2750 // 4528190 - We also need to block pthread restart signal (32 on all 2751 // supported Bsd platforms). Note that BsdThreads need to block 2752 // this signal for all threads to work properly. So we don't have 2753 // to use hard-coded signal number when setting up the mask. 2754 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2755 2756 if (sigaction(SR_signum, &act, 0) == -1) { 2757 return -1; 2758 } 2759 2760 // Save signal flag 2761 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2762 return 0; 2763 } 2764 2765 static int sr_notify(OSThread* osthread) { 2766 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2767 assert_status(status == 0, status, "pthread_kill"); 2768 return status; 2769 } 2770 2771 // "Randomly" selected value for how long we want to spin 2772 // before bailing out on suspending a thread, also how often 2773 // we send a signal to a thread we want to resume 2774 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2775 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2776 2777 // returns true on success and false on error - really an error is fatal 2778 // but this seems the normal response to library errors 2779 static bool do_suspend(OSThread* osthread) { 2780 assert(osthread->sr.is_running(), "thread should be running"); 2781 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2782 2783 // mark as suspended and send signal 2784 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2785 // failed to switch, state wasn't running? 2786 ShouldNotReachHere(); 2787 return false; 2788 } 2789 2790 if (sr_notify(osthread) != 0) { 2791 ShouldNotReachHere(); 2792 } 2793 2794 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2795 while (true) { 2796 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2797 break; 2798 } else { 2799 // timeout 2800 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2801 if (cancelled == os::SuspendResume::SR_RUNNING) { 2802 return false; 2803 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2804 // make sure that we consume the signal on the semaphore as well 2805 sr_semaphore.wait(); 2806 break; 2807 } else { 2808 ShouldNotReachHere(); 2809 return false; 2810 } 2811 } 2812 } 2813 2814 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2815 return true; 2816 } 2817 2818 static void do_resume(OSThread* osthread) { 2819 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2820 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2821 2822 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2823 // failed to switch to WAKEUP_REQUEST 2824 ShouldNotReachHere(); 2825 return; 2826 } 2827 2828 while (true) { 2829 if (sr_notify(osthread) == 0) { 2830 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2831 if (osthread->sr.is_running()) { 2832 return; 2833 } 2834 } 2835 } else { 2836 ShouldNotReachHere(); 2837 } 2838 } 2839 2840 guarantee(osthread->sr.is_running(), "Must be running!"); 2841 } 2842 2843 /////////////////////////////////////////////////////////////////////////////////// 2844 // signal handling (except suspend/resume) 2845 2846 // This routine may be used by user applications as a "hook" to catch signals. 2847 // The user-defined signal handler must pass unrecognized signals to this 2848 // routine, and if it returns true (non-zero), then the signal handler must 2849 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2850 // routine will never retun false (zero), but instead will execute a VM panic 2851 // routine kill the process. 2852 // 2853 // If this routine returns false, it is OK to call it again. This allows 2854 // the user-defined signal handler to perform checks either before or after 2855 // the VM performs its own checks. Naturally, the user code would be making 2856 // a serious error if it tried to handle an exception (such as a null check 2857 // or breakpoint) that the VM was generating for its own correct operation. 2858 // 2859 // This routine may recognize any of the following kinds of signals: 2860 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2861 // It should be consulted by handlers for any of those signals. 2862 // 2863 // The caller of this routine must pass in the three arguments supplied 2864 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2865 // field of the structure passed to sigaction(). This routine assumes that 2866 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2867 // 2868 // Note that the VM will print warnings if it detects conflicting signal 2869 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2870 // 2871 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2872 void* ucontext, 2873 int abort_if_unrecognized); 2874 2875 void signalHandler(int sig, siginfo_t* info, void* uc) { 2876 assert(info != NULL && uc != NULL, "it must be old kernel"); 2877 int orig_errno = errno; // Preserve errno value over signal handler. 2878 JVM_handle_bsd_signal(sig, info, uc, true); 2879 errno = orig_errno; 2880 } 2881 2882 2883 // This boolean allows users to forward their own non-matching signals 2884 // to JVM_handle_bsd_signal, harmlessly. 2885 bool os::Bsd::signal_handlers_are_installed = false; 2886 2887 // For signal-chaining 2888 struct sigaction sigact[NSIG]; 2889 uint32_t sigs = 0; 2890 #if (32 < NSIG-1) 2891 #error "Not all signals can be encoded in sigs. Adapt its type!" 2892 #endif 2893 bool os::Bsd::libjsig_is_loaded = false; 2894 typedef struct sigaction *(*get_signal_t)(int); 2895 get_signal_t os::Bsd::get_signal_action = NULL; 2896 2897 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2898 struct sigaction *actp = NULL; 2899 2900 if (libjsig_is_loaded) { 2901 // Retrieve the old signal handler from libjsig 2902 actp = (*get_signal_action)(sig); 2903 } 2904 if (actp == NULL) { 2905 // Retrieve the preinstalled signal handler from jvm 2906 actp = get_preinstalled_handler(sig); 2907 } 2908 2909 return actp; 2910 } 2911 2912 static bool call_chained_handler(struct sigaction *actp, int sig, 2913 siginfo_t *siginfo, void *context) { 2914 // Call the old signal handler 2915 if (actp->sa_handler == SIG_DFL) { 2916 // It's more reasonable to let jvm treat it as an unexpected exception 2917 // instead of taking the default action. 2918 return false; 2919 } else if (actp->sa_handler != SIG_IGN) { 2920 if ((actp->sa_flags & SA_NODEFER) == 0) { 2921 // automaticlly block the signal 2922 sigaddset(&(actp->sa_mask), sig); 2923 } 2924 2925 sa_handler_t hand; 2926 sa_sigaction_t sa; 2927 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2928 // retrieve the chained handler 2929 if (siginfo_flag_set) { 2930 sa = actp->sa_sigaction; 2931 } else { 2932 hand = actp->sa_handler; 2933 } 2934 2935 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2936 actp->sa_handler = SIG_DFL; 2937 } 2938 2939 // try to honor the signal mask 2940 sigset_t oset; 2941 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2942 2943 // call into the chained handler 2944 if (siginfo_flag_set) { 2945 (*sa)(sig, siginfo, context); 2946 } else { 2947 (*hand)(sig); 2948 } 2949 2950 // restore the signal mask 2951 pthread_sigmask(SIG_SETMASK, &oset, 0); 2952 } 2953 // Tell jvm's signal handler the signal is taken care of. 2954 return true; 2955 } 2956 2957 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2958 bool chained = false; 2959 // signal-chaining 2960 if (UseSignalChaining) { 2961 struct sigaction *actp = get_chained_signal_action(sig); 2962 if (actp != NULL) { 2963 chained = call_chained_handler(actp, sig, siginfo, context); 2964 } 2965 } 2966 return chained; 2967 } 2968 2969 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2970 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 2971 return &sigact[sig]; 2972 } 2973 return NULL; 2974 } 2975 2976 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2977 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2978 sigact[sig] = oldAct; 2979 sigs |= (uint32_t)1 << (sig-1); 2980 } 2981 2982 // for diagnostic 2983 int sigflags[NSIG]; 2984 2985 int os::Bsd::get_our_sigflags(int sig) { 2986 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2987 return sigflags[sig]; 2988 } 2989 2990 void os::Bsd::set_our_sigflags(int sig, int flags) { 2991 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 2992 if (sig > 0 && sig < NSIG) { 2993 sigflags[sig] = flags; 2994 } 2995 } 2996 2997 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 2998 // Check for overwrite. 2999 struct sigaction oldAct; 3000 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3001 3002 void* oldhand = oldAct.sa_sigaction 3003 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3004 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3005 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3006 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3007 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3008 if (AllowUserSignalHandlers || !set_installed) { 3009 // Do not overwrite; user takes responsibility to forward to us. 3010 return; 3011 } else if (UseSignalChaining) { 3012 // save the old handler in jvm 3013 save_preinstalled_handler(sig, oldAct); 3014 // libjsig also interposes the sigaction() call below and saves the 3015 // old sigaction on it own. 3016 } else { 3017 fatal("Encountered unexpected pre-existing sigaction handler " 3018 "%#lx for signal %d.", (long)oldhand, sig); 3019 } 3020 } 3021 3022 struct sigaction sigAct; 3023 sigfillset(&(sigAct.sa_mask)); 3024 sigAct.sa_handler = SIG_DFL; 3025 if (!set_installed) { 3026 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3027 } else { 3028 sigAct.sa_sigaction = signalHandler; 3029 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3030 } 3031 #ifdef __APPLE__ 3032 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3033 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3034 // if the signal handler declares it will handle it on alternate stack. 3035 // Notice we only declare we will handle it on alt stack, but we are not 3036 // actually going to use real alt stack - this is just a workaround. 3037 // Please see ux_exception.c, method catch_mach_exception_raise for details 3038 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3039 if (sig == SIGSEGV) { 3040 sigAct.sa_flags |= SA_ONSTACK; 3041 } 3042 #endif 3043 3044 // Save flags, which are set by ours 3045 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3046 sigflags[sig] = sigAct.sa_flags; 3047 3048 int ret = sigaction(sig, &sigAct, &oldAct); 3049 assert(ret == 0, "check"); 3050 3051 void* oldhand2 = oldAct.sa_sigaction 3052 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3053 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3054 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3055 } 3056 3057 // install signal handlers for signals that HotSpot needs to 3058 // handle in order to support Java-level exception handling. 3059 3060 void os::Bsd::install_signal_handlers() { 3061 if (!signal_handlers_are_installed) { 3062 signal_handlers_are_installed = true; 3063 3064 // signal-chaining 3065 typedef void (*signal_setting_t)(); 3066 signal_setting_t begin_signal_setting = NULL; 3067 signal_setting_t end_signal_setting = NULL; 3068 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3069 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3070 if (begin_signal_setting != NULL) { 3071 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3072 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3073 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3074 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3075 libjsig_is_loaded = true; 3076 assert(UseSignalChaining, "should enable signal-chaining"); 3077 } 3078 if (libjsig_is_loaded) { 3079 // Tell libjsig jvm is setting signal handlers 3080 (*begin_signal_setting)(); 3081 } 3082 3083 set_signal_handler(SIGSEGV, true); 3084 set_signal_handler(SIGPIPE, true); 3085 set_signal_handler(SIGBUS, true); 3086 set_signal_handler(SIGILL, true); 3087 set_signal_handler(SIGFPE, true); 3088 set_signal_handler(SIGXFSZ, true); 3089 3090 #if defined(__APPLE__) 3091 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3092 // signals caught and handled by the JVM. To work around this, we reset the mach task 3093 // signal handler that's placed on our process by CrashReporter. This disables 3094 // CrashReporter-based reporting. 3095 // 3096 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3097 // on caught fatal signals. 3098 // 3099 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3100 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3101 // exception handling, while leaving the standard BSD signal handlers functional. 3102 kern_return_t kr; 3103 kr = task_set_exception_ports(mach_task_self(), 3104 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3105 MACH_PORT_NULL, 3106 EXCEPTION_STATE_IDENTITY, 3107 MACHINE_THREAD_STATE); 3108 3109 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3110 #endif 3111 3112 if (libjsig_is_loaded) { 3113 // Tell libjsig jvm finishes setting signal handlers 3114 (*end_signal_setting)(); 3115 } 3116 3117 // We don't activate signal checker if libjsig is in place, we trust ourselves 3118 // and if UserSignalHandler is installed all bets are off 3119 if (CheckJNICalls) { 3120 if (libjsig_is_loaded) { 3121 if (PrintJNIResolving) { 3122 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3123 } 3124 check_signals = false; 3125 } 3126 if (AllowUserSignalHandlers) { 3127 if (PrintJNIResolving) { 3128 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3129 } 3130 check_signals = false; 3131 } 3132 } 3133 } 3134 } 3135 3136 3137 ///// 3138 // glibc on Bsd platform uses non-documented flag 3139 // to indicate, that some special sort of signal 3140 // trampoline is used. 3141 // We will never set this flag, and we should 3142 // ignore this flag in our diagnostic 3143 #ifdef SIGNIFICANT_SIGNAL_MASK 3144 #undef SIGNIFICANT_SIGNAL_MASK 3145 #endif 3146 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3147 3148 static const char* get_signal_handler_name(address handler, 3149 char* buf, int buflen) { 3150 int offset; 3151 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3152 if (found) { 3153 // skip directory names 3154 const char *p1, *p2; 3155 p1 = buf; 3156 size_t len = strlen(os::file_separator()); 3157 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3158 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3159 } else { 3160 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3161 } 3162 return buf; 3163 } 3164 3165 static void print_signal_handler(outputStream* st, int sig, 3166 char* buf, size_t buflen) { 3167 struct sigaction sa; 3168 3169 sigaction(sig, NULL, &sa); 3170 3171 // See comment for SIGNIFICANT_SIGNAL_MASK define 3172 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3173 3174 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3175 3176 address handler = (sa.sa_flags & SA_SIGINFO) 3177 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3178 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3179 3180 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3181 st->print("SIG_DFL"); 3182 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3183 st->print("SIG_IGN"); 3184 } else { 3185 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3186 } 3187 3188 st->print(", sa_mask[0]="); 3189 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3190 3191 address rh = VMError::get_resetted_sighandler(sig); 3192 // May be, handler was resetted by VMError? 3193 if (rh != NULL) { 3194 handler = rh; 3195 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3196 } 3197 3198 st->print(", sa_flags="); 3199 os::Posix::print_sa_flags(st, sa.sa_flags); 3200 3201 // Check: is it our handler? 3202 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3203 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3204 // It is our signal handler 3205 // check for flags, reset system-used one! 3206 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3207 st->print( 3208 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3209 os::Bsd::get_our_sigflags(sig)); 3210 } 3211 } 3212 st->cr(); 3213 } 3214 3215 3216 #define DO_SIGNAL_CHECK(sig) \ 3217 do { \ 3218 if (!sigismember(&check_signal_done, sig)) { \ 3219 os::Bsd::check_signal_handler(sig); \ 3220 } \ 3221 } while (0) 3222 3223 // This method is a periodic task to check for misbehaving JNI applications 3224 // under CheckJNI, we can add any periodic checks here 3225 3226 void os::run_periodic_checks() { 3227 3228 if (check_signals == false) return; 3229 3230 // SEGV and BUS if overridden could potentially prevent 3231 // generation of hs*.log in the event of a crash, debugging 3232 // such a case can be very challenging, so we absolutely 3233 // check the following for a good measure: 3234 DO_SIGNAL_CHECK(SIGSEGV); 3235 DO_SIGNAL_CHECK(SIGILL); 3236 DO_SIGNAL_CHECK(SIGFPE); 3237 DO_SIGNAL_CHECK(SIGBUS); 3238 DO_SIGNAL_CHECK(SIGPIPE); 3239 DO_SIGNAL_CHECK(SIGXFSZ); 3240 3241 3242 // ReduceSignalUsage allows the user to override these handlers 3243 // see comments at the very top and jvm_solaris.h 3244 if (!ReduceSignalUsage) { 3245 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3246 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3247 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3248 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3249 } 3250 3251 DO_SIGNAL_CHECK(SR_signum); 3252 } 3253 3254 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3255 3256 static os_sigaction_t os_sigaction = NULL; 3257 3258 void os::Bsd::check_signal_handler(int sig) { 3259 char buf[O_BUFLEN]; 3260 address jvmHandler = NULL; 3261 3262 3263 struct sigaction act; 3264 if (os_sigaction == NULL) { 3265 // only trust the default sigaction, in case it has been interposed 3266 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3267 if (os_sigaction == NULL) return; 3268 } 3269 3270 os_sigaction(sig, (struct sigaction*)NULL, &act); 3271 3272 3273 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3274 3275 address thisHandler = (act.sa_flags & SA_SIGINFO) 3276 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3277 : CAST_FROM_FN_PTR(address, act.sa_handler); 3278 3279 3280 switch (sig) { 3281 case SIGSEGV: 3282 case SIGBUS: 3283 case SIGFPE: 3284 case SIGPIPE: 3285 case SIGILL: 3286 case SIGXFSZ: 3287 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3288 break; 3289 3290 case SHUTDOWN1_SIGNAL: 3291 case SHUTDOWN2_SIGNAL: 3292 case SHUTDOWN3_SIGNAL: 3293 case BREAK_SIGNAL: 3294 jvmHandler = (address)user_handler(); 3295 break; 3296 3297 default: 3298 if (sig == SR_signum) { 3299 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3300 } else { 3301 return; 3302 } 3303 break; 3304 } 3305 3306 if (thisHandler != jvmHandler) { 3307 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3308 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3309 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3310 // No need to check this sig any longer 3311 sigaddset(&check_signal_done, sig); 3312 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3313 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3314 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3315 exception_name(sig, buf, O_BUFLEN)); 3316 } 3317 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3318 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3319 tty->print("expected:"); 3320 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3321 tty->cr(); 3322 tty->print(" found:"); 3323 os::Posix::print_sa_flags(tty, act.sa_flags); 3324 tty->cr(); 3325 // No need to check this sig any longer 3326 sigaddset(&check_signal_done, sig); 3327 } 3328 3329 // Dump all the signal 3330 if (sigismember(&check_signal_done, sig)) { 3331 print_signal_handlers(tty, buf, O_BUFLEN); 3332 } 3333 } 3334 3335 extern void report_error(char* file_name, int line_no, char* title, 3336 char* format, ...); 3337 3338 // this is called _before_ the most of global arguments have been parsed 3339 void os::init(void) { 3340 char dummy; // used to get a guess on initial stack address 3341 3342 // With BsdThreads the JavaMain thread pid (primordial thread) 3343 // is different than the pid of the java launcher thread. 3344 // So, on Bsd, the launcher thread pid is passed to the VM 3345 // via the sun.java.launcher.pid property. 3346 // Use this property instead of getpid() if it was correctly passed. 3347 // See bug 6351349. 3348 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3349 3350 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3351 3352 clock_tics_per_sec = CLK_TCK; 3353 3354 init_random(1234567); 3355 3356 Bsd::set_page_size(getpagesize()); 3357 if (Bsd::page_size() == -1) { 3358 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3359 } 3360 init_page_sizes((size_t) Bsd::page_size()); 3361 3362 Bsd::initialize_system_info(); 3363 3364 // main_thread points to the aboriginal thread 3365 Bsd::_main_thread = pthread_self(); 3366 3367 Bsd::clock_init(); 3368 initial_time_count = javaTimeNanos(); 3369 3370 #ifdef __APPLE__ 3371 // XXXDARWIN 3372 // Work around the unaligned VM callbacks in hotspot's 3373 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3374 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3375 // alignment when doing symbol lookup. To work around this, we force early 3376 // binding of all symbols now, thus binding when alignment is known-good. 3377 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3378 #endif 3379 3380 os::Posix::init(); 3381 } 3382 3383 // To install functions for atexit system call 3384 extern "C" { 3385 static void perfMemory_exit_helper() { 3386 perfMemory_exit(); 3387 } 3388 } 3389 3390 // this is called _after_ the global arguments have been parsed 3391 jint os::init_2(void) { 3392 3393 os::Posix::init_2(); 3394 3395 // Allocate a single page and mark it as readable for safepoint polling 3396 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3397 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page"); 3398 3399 os::set_polling_page(polling_page); 3400 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 3401 3402 if (!UseMembar) { 3403 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3404 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3405 os::set_memory_serialize_page(mem_serialize_page); 3406 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 3407 } 3408 3409 // initialize suspend/resume support - must do this before signal_sets_init() 3410 if (SR_initialize() != 0) { 3411 perror("SR_initialize failed"); 3412 return JNI_ERR; 3413 } 3414 3415 Bsd::signal_sets_init(); 3416 Bsd::install_signal_handlers(); 3417 3418 // Check and sets minimum stack sizes against command line options 3419 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3420 return JNI_ERR; 3421 } 3422 3423 if (MaxFDLimit) { 3424 // set the number of file descriptors to max. print out error 3425 // if getrlimit/setrlimit fails but continue regardless. 3426 struct rlimit nbr_files; 3427 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3428 if (status != 0) { 3429 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3430 } else { 3431 nbr_files.rlim_cur = nbr_files.rlim_max; 3432 3433 #ifdef __APPLE__ 3434 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3435 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3436 // be used instead 3437 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3438 #endif 3439 3440 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3441 if (status != 0) { 3442 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3443 } 3444 } 3445 } 3446 3447 // at-exit methods are called in the reverse order of their registration. 3448 // atexit functions are called on return from main or as a result of a 3449 // call to exit(3C). There can be only 32 of these functions registered 3450 // and atexit() does not set errno. 3451 3452 if (PerfAllowAtExitRegistration) { 3453 // only register atexit functions if PerfAllowAtExitRegistration is set. 3454 // atexit functions can be delayed until process exit time, which 3455 // can be problematic for embedded VM situations. Embedded VMs should 3456 // call DestroyJavaVM() to assure that VM resources are released. 3457 3458 // note: perfMemory_exit_helper atexit function may be removed in 3459 // the future if the appropriate cleanup code can be added to the 3460 // VM_Exit VMOperation's doit method. 3461 if (atexit(perfMemory_exit_helper) != 0) { 3462 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3463 } 3464 } 3465 3466 // initialize thread priority policy 3467 prio_init(); 3468 3469 #ifdef __APPLE__ 3470 // dynamically link to objective c gc registration 3471 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3472 if (handleLibObjc != NULL) { 3473 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3474 } 3475 #endif 3476 3477 return JNI_OK; 3478 } 3479 3480 // Mark the polling page as unreadable 3481 void os::make_polling_page_unreadable(void) { 3482 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3483 fatal("Could not disable polling page"); 3484 } 3485 } 3486 3487 // Mark the polling page as readable 3488 void os::make_polling_page_readable(void) { 3489 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3490 fatal("Could not enable polling page"); 3491 } 3492 } 3493 3494 int os::active_processor_count() { 3495 return _processor_count; 3496 } 3497 3498 void os::set_native_thread_name(const char *name) { 3499 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3500 // This is only supported in Snow Leopard and beyond 3501 if (name != NULL) { 3502 // Add a "Java: " prefix to the name 3503 char buf[MAXTHREADNAMESIZE]; 3504 snprintf(buf, sizeof(buf), "Java: %s", name); 3505 pthread_setname_np(buf); 3506 } 3507 #endif 3508 } 3509 3510 bool os::distribute_processes(uint length, uint* distribution) { 3511 // Not yet implemented. 3512 return false; 3513 } 3514 3515 bool os::bind_to_processor(uint processor_id) { 3516 // Not yet implemented. 3517 return false; 3518 } 3519 3520 void os::SuspendedThreadTask::internal_do_task() { 3521 if (do_suspend(_thread->osthread())) { 3522 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3523 do_task(context); 3524 do_resume(_thread->osthread()); 3525 } 3526 } 3527 3528 //////////////////////////////////////////////////////////////////////////////// 3529 // debug support 3530 3531 bool os::find(address addr, outputStream* st) { 3532 Dl_info dlinfo; 3533 memset(&dlinfo, 0, sizeof(dlinfo)); 3534 if (dladdr(addr, &dlinfo) != 0) { 3535 st->print(INTPTR_FORMAT ": ", (intptr_t)addr); 3536 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3537 st->print("%s+%#x", dlinfo.dli_sname, 3538 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr)); 3539 } else if (dlinfo.dli_fbase != NULL) { 3540 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase)); 3541 } else { 3542 st->print("<absolute address>"); 3543 } 3544 if (dlinfo.dli_fname != NULL) { 3545 st->print(" in %s", dlinfo.dli_fname); 3546 } 3547 if (dlinfo.dli_fbase != NULL) { 3548 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase); 3549 } 3550 st->cr(); 3551 3552 if (Verbose) { 3553 // decode some bytes around the PC 3554 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3555 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3556 address lowest = (address) dlinfo.dli_sname; 3557 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3558 if (begin < lowest) begin = lowest; 3559 Dl_info dlinfo2; 3560 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3561 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3562 end = (address) dlinfo2.dli_saddr; 3563 } 3564 Disassembler::decode(begin, end, st); 3565 } 3566 return true; 3567 } 3568 return false; 3569 } 3570 3571 //////////////////////////////////////////////////////////////////////////////// 3572 // misc 3573 3574 // This does not do anything on Bsd. This is basically a hook for being 3575 // able to use structured exception handling (thread-local exception filters) 3576 // on, e.g., Win32. 3577 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3578 const methodHandle& method, JavaCallArguments* args, 3579 Thread* thread) { 3580 f(value, method, args, thread); 3581 } 3582 3583 void os::print_statistics() { 3584 } 3585 3586 bool os::message_box(const char* title, const char* message) { 3587 int i; 3588 fdStream err(defaultStream::error_fd()); 3589 for (i = 0; i < 78; i++) err.print_raw("="); 3590 err.cr(); 3591 err.print_raw_cr(title); 3592 for (i = 0; i < 78; i++) err.print_raw("-"); 3593 err.cr(); 3594 err.print_raw_cr(message); 3595 for (i = 0; i < 78; i++) err.print_raw("="); 3596 err.cr(); 3597 3598 char buf[16]; 3599 // Prevent process from exiting upon "read error" without consuming all CPU 3600 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3601 3602 return buf[0] == 'y' || buf[0] == 'Y'; 3603 } 3604 3605 int os::stat(const char *path, struct stat *sbuf) { 3606 char pathbuf[MAX_PATH]; 3607 if (strlen(path) > MAX_PATH - 1) { 3608 errno = ENAMETOOLONG; 3609 return -1; 3610 } 3611 os::native_path(strcpy(pathbuf, path)); 3612 return ::stat(pathbuf, sbuf); 3613 } 3614 3615 static inline struct timespec get_mtime(const char* filename) { 3616 struct stat st; 3617 int ret = os::stat(filename, &st); 3618 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3619 #ifdef __APPLE__ 3620 return st.st_mtimespec; 3621 #else 3622 return st.st_mtim; 3623 #endif 3624 } 3625 3626 int os::compare_file_modified_times(const char* file1, const char* file2) { 3627 struct timespec filetime1 = get_mtime(file1); 3628 struct timespec filetime2 = get_mtime(file2); 3629 int diff = filetime1.tv_sec - filetime2.tv_sec; 3630 if (diff == 0) { 3631 return filetime1.tv_nsec - filetime2.tv_nsec; 3632 } 3633 return diff; 3634 } 3635 3636 // Is a (classpath) directory empty? 3637 bool os::dir_is_empty(const char* path) { 3638 DIR *dir = NULL; 3639 struct dirent *ptr; 3640 3641 dir = opendir(path); 3642 if (dir == NULL) return true; 3643 3644 // Scan the directory 3645 bool result = true; 3646 char buf[sizeof(struct dirent) + MAX_PATH]; 3647 while (result && (ptr = ::readdir(dir)) != NULL) { 3648 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3649 result = false; 3650 } 3651 } 3652 closedir(dir); 3653 return result; 3654 } 3655 3656 // This code originates from JDK's sysOpen and open64_w 3657 // from src/solaris/hpi/src/system_md.c 3658 3659 int os::open(const char *path, int oflag, int mode) { 3660 if (strlen(path) > MAX_PATH - 1) { 3661 errno = ENAMETOOLONG; 3662 return -1; 3663 } 3664 int fd; 3665 3666 fd = ::open(path, oflag, mode); 3667 if (fd == -1) return -1; 3668 3669 // If the open succeeded, the file might still be a directory 3670 { 3671 struct stat buf; 3672 int ret = ::fstat(fd, &buf); 3673 int st_mode = buf.st_mode; 3674 3675 if (ret != -1) { 3676 if ((st_mode & S_IFMT) == S_IFDIR) { 3677 errno = EISDIR; 3678 ::close(fd); 3679 return -1; 3680 } 3681 } else { 3682 ::close(fd); 3683 return -1; 3684 } 3685 } 3686 3687 // All file descriptors that are opened in the JVM and not 3688 // specifically destined for a subprocess should have the 3689 // close-on-exec flag set. If we don't set it, then careless 3rd 3690 // party native code might fork and exec without closing all 3691 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3692 // UNIXProcess.c), and this in turn might: 3693 // 3694 // - cause end-of-file to fail to be detected on some file 3695 // descriptors, resulting in mysterious hangs, or 3696 // 3697 // - might cause an fopen in the subprocess to fail on a system 3698 // suffering from bug 1085341. 3699 // 3700 // (Yes, the default setting of the close-on-exec flag is a Unix 3701 // design flaw) 3702 // 3703 // See: 3704 // 1085341: 32-bit stdio routines should support file descriptors >255 3705 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3706 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3707 // 3708 #ifdef FD_CLOEXEC 3709 { 3710 int flags = ::fcntl(fd, F_GETFD); 3711 if (flags != -1) { 3712 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3713 } 3714 } 3715 #endif 3716 3717 return fd; 3718 } 3719 3720 3721 // create binary file, rewriting existing file if required 3722 int os::create_binary_file(const char* path, bool rewrite_existing) { 3723 int oflags = O_WRONLY | O_CREAT; 3724 if (!rewrite_existing) { 3725 oflags |= O_EXCL; 3726 } 3727 return ::open(path, oflags, S_IREAD | S_IWRITE); 3728 } 3729 3730 // return current position of file pointer 3731 jlong os::current_file_offset(int fd) { 3732 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3733 } 3734 3735 // move file pointer to the specified offset 3736 jlong os::seek_to_file_offset(int fd, jlong offset) { 3737 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3738 } 3739 3740 // This code originates from JDK's sysAvailable 3741 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3742 3743 int os::available(int fd, jlong *bytes) { 3744 jlong cur, end; 3745 int mode; 3746 struct stat buf; 3747 3748 if (::fstat(fd, &buf) >= 0) { 3749 mode = buf.st_mode; 3750 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3751 int n; 3752 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3753 *bytes = n; 3754 return 1; 3755 } 3756 } 3757 } 3758 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3759 return 0; 3760 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3761 return 0; 3762 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3763 return 0; 3764 } 3765 *bytes = end - cur; 3766 return 1; 3767 } 3768 3769 // Map a block of memory. 3770 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3771 char *addr, size_t bytes, bool read_only, 3772 bool allow_exec) { 3773 int prot; 3774 int flags; 3775 3776 if (read_only) { 3777 prot = PROT_READ; 3778 flags = MAP_SHARED; 3779 } else { 3780 prot = PROT_READ | PROT_WRITE; 3781 flags = MAP_PRIVATE; 3782 } 3783 3784 if (allow_exec) { 3785 prot |= PROT_EXEC; 3786 } 3787 3788 if (addr != NULL) { 3789 flags |= MAP_FIXED; 3790 } 3791 3792 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3793 fd, file_offset); 3794 if (mapped_address == MAP_FAILED) { 3795 return NULL; 3796 } 3797 return mapped_address; 3798 } 3799 3800 3801 // Remap a block of memory. 3802 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3803 char *addr, size_t bytes, bool read_only, 3804 bool allow_exec) { 3805 // same as map_memory() on this OS 3806 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3807 allow_exec); 3808 } 3809 3810 3811 // Unmap a block of memory. 3812 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3813 return munmap(addr, bytes) == 0; 3814 } 3815 3816 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3817 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3818 // of a thread. 3819 // 3820 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3821 // the fast estimate available on the platform. 3822 3823 jlong os::current_thread_cpu_time() { 3824 #ifdef __APPLE__ 3825 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3826 #else 3827 Unimplemented(); 3828 return 0; 3829 #endif 3830 } 3831 3832 jlong os::thread_cpu_time(Thread* thread) { 3833 #ifdef __APPLE__ 3834 return os::thread_cpu_time(thread, true /* user + sys */); 3835 #else 3836 Unimplemented(); 3837 return 0; 3838 #endif 3839 } 3840 3841 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3842 #ifdef __APPLE__ 3843 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3844 #else 3845 Unimplemented(); 3846 return 0; 3847 #endif 3848 } 3849 3850 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3851 #ifdef __APPLE__ 3852 struct thread_basic_info tinfo; 3853 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3854 kern_return_t kr; 3855 thread_t mach_thread; 3856 3857 mach_thread = thread->osthread()->thread_id(); 3858 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3859 if (kr != KERN_SUCCESS) { 3860 return -1; 3861 } 3862 3863 if (user_sys_cpu_time) { 3864 jlong nanos; 3865 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3866 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3867 return nanos; 3868 } else { 3869 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3870 } 3871 #else 3872 Unimplemented(); 3873 return 0; 3874 #endif 3875 } 3876 3877 3878 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3879 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3880 info_ptr->may_skip_backward = false; // elapsed time not wall time 3881 info_ptr->may_skip_forward = false; // elapsed time not wall time 3882 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3883 } 3884 3885 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3886 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3887 info_ptr->may_skip_backward = false; // elapsed time not wall time 3888 info_ptr->may_skip_forward = false; // elapsed time not wall time 3889 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3890 } 3891 3892 bool os::is_thread_cpu_time_supported() { 3893 #ifdef __APPLE__ 3894 return true; 3895 #else 3896 return false; 3897 #endif 3898 } 3899 3900 // System loadavg support. Returns -1 if load average cannot be obtained. 3901 // Bsd doesn't yet have a (official) notion of processor sets, 3902 // so just return the system wide load average. 3903 int os::loadavg(double loadavg[], int nelem) { 3904 return ::getloadavg(loadavg, nelem); 3905 } 3906 3907 void os::pause() { 3908 char filename[MAX_PATH]; 3909 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3910 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3911 } else { 3912 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3913 } 3914 3915 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3916 if (fd != -1) { 3917 struct stat buf; 3918 ::close(fd); 3919 while (::stat(filename, &buf) == 0) { 3920 (void)::poll(NULL, 0, 100); 3921 } 3922 } else { 3923 jio_fprintf(stderr, 3924 "Could not open pause file '%s', continuing immediately.\n", filename); 3925 } 3926 } 3927 3928 // Darwin has no "environ" in a dynamic library. 3929 #ifdef __APPLE__ 3930 #include <crt_externs.h> 3931 #define environ (*_NSGetEnviron()) 3932 #else 3933 extern char** environ; 3934 #endif 3935 3936 // Run the specified command in a separate process. Return its exit value, 3937 // or -1 on failure (e.g. can't fork a new process). 3938 // Unlike system(), this function can be called from signal handler. It 3939 // doesn't block SIGINT et al. 3940 int os::fork_and_exec(char* cmd) { 3941 const char * argv[4] = {"sh", "-c", cmd, NULL}; 3942 3943 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 3944 // pthread_atfork handlers and reset pthread library. All we need is a 3945 // separate process to execve. Make a direct syscall to fork process. 3946 // On IA64 there's no fork syscall, we have to use fork() and hope for 3947 // the best... 3948 pid_t pid = fork(); 3949 3950 if (pid < 0) { 3951 // fork failed 3952 return -1; 3953 3954 } else if (pid == 0) { 3955 // child process 3956 3957 // execve() in BsdThreads will call pthread_kill_other_threads_np() 3958 // first to kill every thread on the thread list. Because this list is 3959 // not reset by fork() (see notes above), execve() will instead kill 3960 // every thread in the parent process. We know this is the only thread 3961 // in the new process, so make a system call directly. 3962 // IA64 should use normal execve() from glibc to match the glibc fork() 3963 // above. 3964 execve("/bin/sh", (char* const*)argv, environ); 3965 3966 // execve failed 3967 _exit(-1); 3968 3969 } else { 3970 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 3971 // care about the actual exit code, for now. 3972 3973 int status; 3974 3975 // Wait for the child process to exit. This returns immediately if 3976 // the child has already exited. */ 3977 while (waitpid(pid, &status, 0) < 0) { 3978 switch (errno) { 3979 case ECHILD: return 0; 3980 case EINTR: break; 3981 default: return -1; 3982 } 3983 } 3984 3985 if (WIFEXITED(status)) { 3986 // The child exited normally; get its exit code. 3987 return WEXITSTATUS(status); 3988 } else if (WIFSIGNALED(status)) { 3989 // The child exited because of a signal 3990 // The best value to return is 0x80 + signal number, 3991 // because that is what all Unix shells do, and because 3992 // it allows callers to distinguish between process exit and 3993 // process death by signal. 3994 return 0x80 + WTERMSIG(status); 3995 } else { 3996 // Unknown exit code; pass it through 3997 return status; 3998 } 3999 } 4000 } 4001 4002 // is_headless_jre() 4003 // 4004 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4005 // in order to report if we are running in a headless jre 4006 // 4007 // Since JDK8 xawt/libmawt.so was moved into the same directory 4008 // as libawt.so, and renamed libawt_xawt.so 4009 // 4010 bool os::is_headless_jre() { 4011 #ifdef __APPLE__ 4012 // We no longer build headless-only on Mac OS X 4013 return false; 4014 #else 4015 struct stat statbuf; 4016 char buf[MAXPATHLEN]; 4017 char libmawtpath[MAXPATHLEN]; 4018 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4019 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4020 char *p; 4021 4022 // Get path to libjvm.so 4023 os::jvm_path(buf, sizeof(buf)); 4024 4025 // Get rid of libjvm.so 4026 p = strrchr(buf, '/'); 4027 if (p == NULL) { 4028 return false; 4029 } else { 4030 *p = '\0'; 4031 } 4032 4033 // Get rid of client or server 4034 p = strrchr(buf, '/'); 4035 if (p == NULL) { 4036 return false; 4037 } else { 4038 *p = '\0'; 4039 } 4040 4041 // check xawt/libmawt.so 4042 strcpy(libmawtpath, buf); 4043 strcat(libmawtpath, xawtstr); 4044 if (::stat(libmawtpath, &statbuf) == 0) return false; 4045 4046 // check libawt_xawt.so 4047 strcpy(libmawtpath, buf); 4048 strcat(libmawtpath, new_xawtstr); 4049 if (::stat(libmawtpath, &statbuf) == 0) return false; 4050 4051 return true; 4052 #endif 4053 } 4054 4055 // Get the default path to the core file 4056 // Returns the length of the string 4057 int os::get_core_path(char* buffer, size_t bufferSize) { 4058 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 4059 4060 // Truncate if theoretical string was longer than bufferSize 4061 n = MIN2(n, (int)bufferSize); 4062 4063 return n; 4064 } 4065 4066 #ifndef PRODUCT 4067 void TestReserveMemorySpecial_test() { 4068 // No tests available for this platform 4069 } 4070 #endif 4071 4072 bool os::start_debugging(char *buf, int buflen) { 4073 int len = (int)strlen(buf); 4074 char *p = &buf[len]; 4075 4076 jio_snprintf(p, buflen-len, 4077 "\n\n" 4078 "Do you want to debug the problem?\n\n" 4079 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 4080 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 4081 "Otherwise, press RETURN to abort...", 4082 os::current_process_id(), os::current_process_id(), 4083 os::current_thread_id(), os::current_thread_id()); 4084 4085 bool yes = os::message_box("Unexpected Error", buf); 4086 4087 if (yes) { 4088 // yes, user asked VM to launch debugger 4089 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 4090 os::current_process_id(), os::current_process_id()); 4091 4092 os::fork_and_exec(buf); 4093 yes = false; 4094 } 4095 return yes; 4096 }