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, (volatile jlong*)&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 #define JNI_LIB_PREFIX "lib" 1176 #ifdef __APPLE__ 1177 #define JNI_LIB_SUFFIX ".dylib" 1178 #else 1179 #define JNI_LIB_SUFFIX ".so" 1180 #endif 1181 1182 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1183 1184 // This must be hard coded because it's the system's temporary 1185 // directory not the java application's temp directory, ala java.io.tmpdir. 1186 #ifdef __APPLE__ 1187 // macosx has a secure per-user temporary directory 1188 char temp_path_storage[PATH_MAX]; 1189 const char* os::get_temp_directory() { 1190 static char *temp_path = NULL; 1191 if (temp_path == NULL) { 1192 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1193 if (pathSize == 0 || pathSize > PATH_MAX) { 1194 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1195 } 1196 temp_path = temp_path_storage; 1197 } 1198 return temp_path; 1199 } 1200 #else // __APPLE__ 1201 const char* os::get_temp_directory() { return "/tmp"; } 1202 #endif // __APPLE__ 1203 1204 static bool file_exists(const char* filename) { 1205 struct stat statbuf; 1206 if (filename == NULL || strlen(filename) == 0) { 1207 return false; 1208 } 1209 return os::stat(filename, &statbuf) == 0; 1210 } 1211 1212 bool os::dll_build_name(char* buffer, size_t buflen, 1213 const char* pname, const char* fname) { 1214 bool retval = false; 1215 // Copied from libhpi 1216 const size_t pnamelen = pname ? strlen(pname) : 0; 1217 1218 // Return error on buffer overflow. 1219 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1220 return retval; 1221 } 1222 1223 if (pnamelen == 0) { 1224 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1225 retval = true; 1226 } else if (strchr(pname, *os::path_separator()) != NULL) { 1227 int n; 1228 char** pelements = split_path(pname, &n); 1229 if (pelements == NULL) { 1230 return false; 1231 } 1232 for (int i = 0; i < n; i++) { 1233 // Really shouldn't be NULL, but check can't hurt 1234 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1235 continue; // skip the empty path values 1236 } 1237 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1238 pelements[i], fname); 1239 if (file_exists(buffer)) { 1240 retval = true; 1241 break; 1242 } 1243 } 1244 // release the storage 1245 for (int i = 0; i < n; i++) { 1246 if (pelements[i] != NULL) { 1247 FREE_C_HEAP_ARRAY(char, pelements[i]); 1248 } 1249 } 1250 if (pelements != NULL) { 1251 FREE_C_HEAP_ARRAY(char*, pelements); 1252 } 1253 } else { 1254 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1255 retval = true; 1256 } 1257 return retval; 1258 } 1259 1260 // check if addr is inside libjvm.so 1261 bool os::address_is_in_vm(address addr) { 1262 static address libjvm_base_addr; 1263 Dl_info dlinfo; 1264 1265 if (libjvm_base_addr == NULL) { 1266 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1267 libjvm_base_addr = (address)dlinfo.dli_fbase; 1268 } 1269 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1270 } 1271 1272 if (dladdr((void *)addr, &dlinfo) != 0) { 1273 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1274 } 1275 1276 return false; 1277 } 1278 1279 1280 #define MACH_MAXSYMLEN 256 1281 1282 bool os::dll_address_to_function_name(address addr, char *buf, 1283 int buflen, int *offset, 1284 bool demangle) { 1285 // buf is not optional, but offset is optional 1286 assert(buf != NULL, "sanity check"); 1287 1288 Dl_info dlinfo; 1289 char localbuf[MACH_MAXSYMLEN]; 1290 1291 if (dladdr((void*)addr, &dlinfo) != 0) { 1292 // see if we have a matching symbol 1293 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1294 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1295 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1296 } 1297 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1298 return true; 1299 } 1300 // no matching symbol so try for just file info 1301 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1302 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1303 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1304 return true; 1305 } 1306 } 1307 1308 // Handle non-dynamic manually: 1309 if (dlinfo.dli_fbase != NULL && 1310 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1311 dlinfo.dli_fbase)) { 1312 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1313 jio_snprintf(buf, buflen, "%s", localbuf); 1314 } 1315 return true; 1316 } 1317 } 1318 buf[0] = '\0'; 1319 if (offset != NULL) *offset = -1; 1320 return false; 1321 } 1322 1323 // ported from solaris version 1324 bool os::dll_address_to_library_name(address addr, char* buf, 1325 int buflen, int* offset) { 1326 // buf is not optional, but offset is optional 1327 assert(buf != NULL, "sanity check"); 1328 1329 Dl_info dlinfo; 1330 1331 if (dladdr((void*)addr, &dlinfo) != 0) { 1332 if (dlinfo.dli_fname != NULL) { 1333 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1334 } 1335 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1336 *offset = addr - (address)dlinfo.dli_fbase; 1337 } 1338 return true; 1339 } 1340 1341 buf[0] = '\0'; 1342 if (offset) *offset = -1; 1343 return false; 1344 } 1345 1346 // Loads .dll/.so and 1347 // in case of error it checks if .dll/.so was built for the 1348 // same architecture as Hotspot is running on 1349 1350 #ifdef __APPLE__ 1351 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1352 #ifdef STATIC_BUILD 1353 return os::get_default_process_handle(); 1354 #else 1355 void * result= ::dlopen(filename, RTLD_LAZY); 1356 if (result != NULL) { 1357 // Successful loading 1358 return result; 1359 } 1360 1361 // Read system error message into ebuf 1362 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1363 ebuf[ebuflen-1]='\0'; 1364 1365 return NULL; 1366 #endif // STATIC_BUILD 1367 } 1368 #else 1369 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1370 #ifdef STATIC_BUILD 1371 return os::get_default_process_handle(); 1372 #else 1373 void * result= ::dlopen(filename, RTLD_LAZY); 1374 if (result != NULL) { 1375 // Successful loading 1376 return result; 1377 } 1378 1379 Elf32_Ehdr elf_head; 1380 1381 // Read system error message into ebuf 1382 // It may or may not be overwritten below 1383 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1384 ebuf[ebuflen-1]='\0'; 1385 int diag_msg_max_length=ebuflen-strlen(ebuf); 1386 char* diag_msg_buf=ebuf+strlen(ebuf); 1387 1388 if (diag_msg_max_length==0) { 1389 // No more space in ebuf for additional diagnostics message 1390 return NULL; 1391 } 1392 1393 1394 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1395 1396 if (file_descriptor < 0) { 1397 // Can't open library, report dlerror() message 1398 return NULL; 1399 } 1400 1401 bool failed_to_read_elf_head= 1402 (sizeof(elf_head)!= 1403 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1404 1405 ::close(file_descriptor); 1406 if (failed_to_read_elf_head) { 1407 // file i/o error - report dlerror() msg 1408 return NULL; 1409 } 1410 1411 typedef struct { 1412 Elf32_Half code; // Actual value as defined in elf.h 1413 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1414 char elf_class; // 32 or 64 bit 1415 char endianess; // MSB or LSB 1416 char* name; // String representation 1417 } arch_t; 1418 1419 #ifndef EM_486 1420 #define EM_486 6 /* Intel 80486 */ 1421 #endif 1422 1423 #ifndef EM_MIPS_RS3_LE 1424 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1425 #endif 1426 1427 #ifndef EM_PPC64 1428 #define EM_PPC64 21 /* PowerPC64 */ 1429 #endif 1430 1431 #ifndef EM_S390 1432 #define EM_S390 22 /* IBM System/390 */ 1433 #endif 1434 1435 #ifndef EM_IA_64 1436 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1437 #endif 1438 1439 #ifndef EM_X86_64 1440 #define EM_X86_64 62 /* AMD x86-64 */ 1441 #endif 1442 1443 static const arch_t arch_array[]={ 1444 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1445 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1446 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1447 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1448 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1449 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1450 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1451 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1452 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1453 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1454 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1455 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1456 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1457 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1458 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1459 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1460 }; 1461 1462 #if (defined IA32) 1463 static Elf32_Half running_arch_code=EM_386; 1464 #elif (defined AMD64) 1465 static Elf32_Half running_arch_code=EM_X86_64; 1466 #elif (defined IA64) 1467 static Elf32_Half running_arch_code=EM_IA_64; 1468 #elif (defined __sparc) && (defined _LP64) 1469 static Elf32_Half running_arch_code=EM_SPARCV9; 1470 #elif (defined __sparc) && (!defined _LP64) 1471 static Elf32_Half running_arch_code=EM_SPARC; 1472 #elif (defined __powerpc64__) 1473 static Elf32_Half running_arch_code=EM_PPC64; 1474 #elif (defined __powerpc__) 1475 static Elf32_Half running_arch_code=EM_PPC; 1476 #elif (defined ARM) 1477 static Elf32_Half running_arch_code=EM_ARM; 1478 #elif (defined S390) 1479 static Elf32_Half running_arch_code=EM_S390; 1480 #elif (defined ALPHA) 1481 static Elf32_Half running_arch_code=EM_ALPHA; 1482 #elif (defined MIPSEL) 1483 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1484 #elif (defined PARISC) 1485 static Elf32_Half running_arch_code=EM_PARISC; 1486 #elif (defined MIPS) 1487 static Elf32_Half running_arch_code=EM_MIPS; 1488 #elif (defined M68K) 1489 static Elf32_Half running_arch_code=EM_68K; 1490 #else 1491 #error Method os::dll_load requires that one of following is defined:\ 1492 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1493 #endif 1494 1495 // Identify compatability class for VM's architecture and library's architecture 1496 // Obtain string descriptions for architectures 1497 1498 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1499 int running_arch_index=-1; 1500 1501 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1502 if (running_arch_code == arch_array[i].code) { 1503 running_arch_index = i; 1504 } 1505 if (lib_arch.code == arch_array[i].code) { 1506 lib_arch.compat_class = arch_array[i].compat_class; 1507 lib_arch.name = arch_array[i].name; 1508 } 1509 } 1510 1511 assert(running_arch_index != -1, 1512 "Didn't find running architecture code (running_arch_code) in arch_array"); 1513 if (running_arch_index == -1) { 1514 // Even though running architecture detection failed 1515 // we may still continue with reporting dlerror() message 1516 return NULL; 1517 } 1518 1519 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1520 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1521 return NULL; 1522 } 1523 1524 #ifndef S390 1525 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1526 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1527 return NULL; 1528 } 1529 #endif // !S390 1530 1531 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1532 if (lib_arch.name!=NULL) { 1533 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1534 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1535 lib_arch.name, arch_array[running_arch_index].name); 1536 } else { 1537 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1538 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1539 lib_arch.code, 1540 arch_array[running_arch_index].name); 1541 } 1542 } 1543 1544 return NULL; 1545 #endif // STATIC_BUILD 1546 } 1547 #endif // !__APPLE__ 1548 1549 void* os::get_default_process_handle() { 1550 #ifdef __APPLE__ 1551 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1552 // to avoid finding unexpected symbols on second (or later) 1553 // loads of a library. 1554 return (void*)::dlopen(NULL, RTLD_FIRST); 1555 #else 1556 return (void*)::dlopen(NULL, RTLD_LAZY); 1557 #endif 1558 } 1559 1560 // XXX: Do we need a lock around this as per Linux? 1561 void* os::dll_lookup(void* handle, const char* name) { 1562 return dlsym(handle, name); 1563 } 1564 1565 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1566 outputStream * out = (outputStream *) param; 1567 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name); 1568 return 0; 1569 } 1570 1571 void os::print_dll_info(outputStream *st) { 1572 st->print_cr("Dynamic libraries:"); 1573 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1574 st->print_cr("Error: Cannot print dynamic libraries."); 1575 } 1576 } 1577 1578 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1579 #ifdef RTLD_DI_LINKMAP 1580 Dl_info dli; 1581 void *handle; 1582 Link_map *map; 1583 Link_map *p; 1584 1585 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1586 dli.dli_fname == NULL) { 1587 return 1; 1588 } 1589 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1590 if (handle == NULL) { 1591 return 1; 1592 } 1593 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1594 if (map == NULL) { 1595 dlclose(handle); 1596 return 1; 1597 } 1598 1599 while (map->l_prev != NULL) 1600 map = map->l_prev; 1601 1602 while (map != NULL) { 1603 // Value for top_address is returned as 0 since we don't have any information about module size 1604 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1605 dlclose(handle); 1606 return 1; 1607 } 1608 map = map->l_next; 1609 } 1610 1611 dlclose(handle); 1612 #elif defined(__APPLE__) 1613 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1614 // Value for top_address is returned as 0 since we don't have any information about module size 1615 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1616 return 1; 1617 } 1618 } 1619 return 0; 1620 #else 1621 return 1; 1622 #endif 1623 } 1624 1625 void os::get_summary_os_info(char* buf, size_t buflen) { 1626 // These buffers are small because we want this to be brief 1627 // and not use a lot of stack while generating the hs_err file. 1628 char os[100]; 1629 size_t size = sizeof(os); 1630 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1631 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1632 #ifdef __APPLE__ 1633 strncpy(os, "Darwin", sizeof(os)); 1634 #elif __OpenBSD__ 1635 strncpy(os, "OpenBSD", sizeof(os)); 1636 #else 1637 strncpy(os, "BSD", sizeof(os)); 1638 #endif 1639 } 1640 1641 char release[100]; 1642 size = sizeof(release); 1643 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1644 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1645 // if error, leave blank 1646 strncpy(release, "", sizeof(release)); 1647 } 1648 snprintf(buf, buflen, "%s %s", os, release); 1649 } 1650 1651 void os::print_os_info_brief(outputStream* st) { 1652 os::Posix::print_uname_info(st); 1653 } 1654 1655 void os::print_os_info(outputStream* st) { 1656 st->print("OS:"); 1657 1658 os::Posix::print_uname_info(st); 1659 1660 os::Posix::print_rlimit_info(st); 1661 1662 os::Posix::print_load_average(st); 1663 } 1664 1665 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1666 // Nothing to do for now. 1667 } 1668 1669 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1670 unsigned int mhz; 1671 size_t size = sizeof(mhz); 1672 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1673 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1674 mhz = 1; // looks like an error but can be divided by 1675 } else { 1676 mhz /= 1000000; // reported in millions 1677 } 1678 1679 char model[100]; 1680 size = sizeof(model); 1681 int mib_model[] = { CTL_HW, HW_MODEL }; 1682 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1683 strncpy(model, cpu_arch, sizeof(model)); 1684 } 1685 1686 char machine[100]; 1687 size = sizeof(machine); 1688 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1689 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1690 strncpy(machine, "", sizeof(machine)); 1691 } 1692 1693 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1694 } 1695 1696 void os::print_memory_info(outputStream* st) { 1697 1698 st->print("Memory:"); 1699 st->print(" %dk page", os::vm_page_size()>>10); 1700 1701 st->print(", physical " UINT64_FORMAT "k", 1702 os::physical_memory() >> 10); 1703 st->print("(" UINT64_FORMAT "k free)", 1704 os::available_memory() >> 10); 1705 st->cr(); 1706 } 1707 1708 static void print_signal_handler(outputStream* st, int sig, 1709 char* buf, size_t buflen); 1710 1711 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1712 st->print_cr("Signal Handlers:"); 1713 print_signal_handler(st, SIGSEGV, buf, buflen); 1714 print_signal_handler(st, SIGBUS , buf, buflen); 1715 print_signal_handler(st, SIGFPE , buf, buflen); 1716 print_signal_handler(st, SIGPIPE, buf, buflen); 1717 print_signal_handler(st, SIGXFSZ, buf, buflen); 1718 print_signal_handler(st, SIGILL , buf, buflen); 1719 print_signal_handler(st, SR_signum, buf, buflen); 1720 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1721 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1722 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1723 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1724 } 1725 1726 static char saved_jvm_path[MAXPATHLEN] = {0}; 1727 1728 // Find the full path to the current module, libjvm 1729 void os::jvm_path(char *buf, jint buflen) { 1730 // Error checking. 1731 if (buflen < MAXPATHLEN) { 1732 assert(false, "must use a large-enough buffer"); 1733 buf[0] = '\0'; 1734 return; 1735 } 1736 // Lazy resolve the path to current module. 1737 if (saved_jvm_path[0] != 0) { 1738 strcpy(buf, saved_jvm_path); 1739 return; 1740 } 1741 1742 char dli_fname[MAXPATHLEN]; 1743 bool ret = dll_address_to_library_name( 1744 CAST_FROM_FN_PTR(address, os::jvm_path), 1745 dli_fname, sizeof(dli_fname), NULL); 1746 assert(ret, "cannot locate libjvm"); 1747 char *rp = NULL; 1748 if (ret && dli_fname[0] != '\0') { 1749 rp = os::Posix::realpath(dli_fname, buf, buflen); 1750 } 1751 if (rp == NULL) { 1752 return; 1753 } 1754 1755 if (Arguments::sun_java_launcher_is_altjvm()) { 1756 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1757 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1758 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1759 // appears at the right place in the string, then assume we are 1760 // installed in a JDK and we're done. Otherwise, check for a 1761 // JAVA_HOME environment variable and construct a path to the JVM 1762 // being overridden. 1763 1764 const char *p = buf + strlen(buf) - 1; 1765 for (int count = 0; p > buf && count < 5; ++count) { 1766 for (--p; p > buf && *p != '/'; --p) 1767 /* empty */ ; 1768 } 1769 1770 if (strncmp(p, "/jre/lib/", 9) != 0) { 1771 // Look for JAVA_HOME in the environment. 1772 char* java_home_var = ::getenv("JAVA_HOME"); 1773 if (java_home_var != NULL && java_home_var[0] != 0) { 1774 char* jrelib_p; 1775 int len; 1776 1777 // Check the current module name "libjvm" 1778 p = strrchr(buf, '/'); 1779 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1780 1781 rp = os::Posix::realpath(java_home_var, buf, buflen); 1782 if (rp == NULL) { 1783 return; 1784 } 1785 1786 // determine if this is a legacy image or modules image 1787 // modules image doesn't have "jre" subdirectory 1788 len = strlen(buf); 1789 assert(len < buflen, "Ran out of buffer space"); 1790 jrelib_p = buf + len; 1791 1792 // Add the appropriate library subdir 1793 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1794 if (0 != access(buf, F_OK)) { 1795 snprintf(jrelib_p, buflen-len, "/lib"); 1796 } 1797 1798 // Add the appropriate client or server subdir 1799 len = strlen(buf); 1800 jrelib_p = buf + len; 1801 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1802 if (0 != access(buf, F_OK)) { 1803 snprintf(jrelib_p, buflen-len, "%s", ""); 1804 } 1805 1806 // If the path exists within JAVA_HOME, add the JVM library name 1807 // to complete the path to JVM being overridden. Otherwise fallback 1808 // to the path to the current library. 1809 if (0 == access(buf, F_OK)) { 1810 // Use current module name "libjvm" 1811 len = strlen(buf); 1812 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1813 } else { 1814 // Fall back to path of current library 1815 rp = os::Posix::realpath(dli_fname, buf, buflen); 1816 if (rp == NULL) { 1817 return; 1818 } 1819 } 1820 } 1821 } 1822 } 1823 1824 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1825 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1826 } 1827 1828 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1829 // no prefix required, not even "_" 1830 } 1831 1832 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1833 // no suffix required 1834 } 1835 1836 //////////////////////////////////////////////////////////////////////////////// 1837 // sun.misc.Signal support 1838 1839 static volatile jint sigint_count = 0; 1840 1841 static void UserHandler(int sig, void *siginfo, void *context) { 1842 // 4511530 - sem_post is serialized and handled by the manager thread. When 1843 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1844 // don't want to flood the manager thread with sem_post requests. 1845 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1846 return; 1847 } 1848 1849 // Ctrl-C is pressed during error reporting, likely because the error 1850 // handler fails to abort. Let VM die immediately. 1851 if (sig == SIGINT && VMError::is_error_reported()) { 1852 os::die(); 1853 } 1854 1855 os::signal_notify(sig); 1856 } 1857 1858 void* os::user_handler() { 1859 return CAST_FROM_FN_PTR(void*, UserHandler); 1860 } 1861 1862 extern "C" { 1863 typedef void (*sa_handler_t)(int); 1864 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1865 } 1866 1867 void* os::signal(int signal_number, void* handler) { 1868 struct sigaction sigAct, oldSigAct; 1869 1870 sigfillset(&(sigAct.sa_mask)); 1871 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1872 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1873 1874 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1875 // -1 means registration failed 1876 return (void *)-1; 1877 } 1878 1879 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1880 } 1881 1882 void os::signal_raise(int signal_number) { 1883 ::raise(signal_number); 1884 } 1885 1886 // The following code is moved from os.cpp for making this 1887 // code platform specific, which it is by its very nature. 1888 1889 // Will be modified when max signal is changed to be dynamic 1890 int os::sigexitnum_pd() { 1891 return NSIG; 1892 } 1893 1894 // a counter for each possible signal value 1895 static volatile jint pending_signals[NSIG+1] = { 0 }; 1896 1897 // Bsd(POSIX) specific hand shaking semaphore. 1898 #ifdef __APPLE__ 1899 typedef semaphore_t os_semaphore_t; 1900 1901 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1902 #define SEM_WAIT(sem) semaphore_wait(sem) 1903 #define SEM_POST(sem) semaphore_signal(sem) 1904 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1905 #else 1906 typedef sem_t os_semaphore_t; 1907 1908 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1909 #define SEM_WAIT(sem) sem_wait(&sem) 1910 #define SEM_POST(sem) sem_post(&sem) 1911 #define SEM_DESTROY(sem) sem_destroy(&sem) 1912 #endif 1913 1914 #ifdef __APPLE__ 1915 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. 1916 1917 static const char* sem_init_strerror(kern_return_t value) { 1918 switch (value) { 1919 case KERN_INVALID_ARGUMENT: return "Invalid argument"; 1920 case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; 1921 default: return "Unknown"; 1922 } 1923 } 1924 1925 OSXSemaphore::OSXSemaphore(uint value) { 1926 kern_return_t ret = SEM_INIT(_semaphore, value); 1927 1928 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); 1929 } 1930 1931 OSXSemaphore::~OSXSemaphore() { 1932 SEM_DESTROY(_semaphore); 1933 } 1934 1935 void OSXSemaphore::signal(uint count) { 1936 for (uint i = 0; i < count; i++) { 1937 kern_return_t ret = SEM_POST(_semaphore); 1938 1939 assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); 1940 } 1941 } 1942 1943 void OSXSemaphore::wait() { 1944 kern_return_t ret; 1945 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) { 1946 // Semaphore was interrupted. Retry. 1947 } 1948 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); 1949 } 1950 1951 jlong OSXSemaphore::currenttime() { 1952 struct timeval tv; 1953 gettimeofday(&tv, NULL); 1954 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1955 } 1956 1957 bool OSXSemaphore::trywait() { 1958 return timedwait(0, 0); 1959 } 1960 1961 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { 1962 kern_return_t kr = KERN_ABORTED; 1963 mach_timespec_t waitspec; 1964 waitspec.tv_sec = sec; 1965 waitspec.tv_nsec = nsec; 1966 1967 jlong starttime = currenttime(); 1968 1969 kr = semaphore_timedwait(_semaphore, waitspec); 1970 while (kr == KERN_ABORTED) { 1971 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1972 1973 jlong current = currenttime(); 1974 jlong passedtime = current - starttime; 1975 1976 if (passedtime >= totalwait) { 1977 waitspec.tv_sec = 0; 1978 waitspec.tv_nsec = 0; 1979 } else { 1980 jlong waittime = totalwait - (current - starttime); 1981 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1982 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1983 } 1984 1985 kr = semaphore_timedwait(_semaphore, waitspec); 1986 } 1987 1988 return kr == KERN_SUCCESS; 1989 } 1990 1991 #else 1992 // Use POSIX implementation of semaphores. 1993 1994 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 1995 struct timespec ts; 1996 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 1997 1998 return ts; 1999 } 2000 2001 #endif // __APPLE__ 2002 2003 static os_semaphore_t sig_sem; 2004 2005 #ifdef __APPLE__ 2006 static OSXSemaphore sr_semaphore; 2007 #else 2008 static PosixSemaphore sr_semaphore; 2009 #endif 2010 2011 void os::signal_init_pd() { 2012 // Initialize signal structures 2013 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2014 2015 // Initialize signal semaphore 2016 ::SEM_INIT(sig_sem, 0); 2017 } 2018 2019 void os::signal_notify(int sig) { 2020 Atomic::inc(&pending_signals[sig]); 2021 ::SEM_POST(sig_sem); 2022 } 2023 2024 static int check_pending_signals(bool wait) { 2025 Atomic::store(0, &sigint_count); 2026 for (;;) { 2027 for (int i = 0; i < NSIG + 1; i++) { 2028 jint n = pending_signals[i]; 2029 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2030 return i; 2031 } 2032 } 2033 if (!wait) { 2034 return -1; 2035 } 2036 JavaThread *thread = JavaThread::current(); 2037 ThreadBlockInVM tbivm(thread); 2038 2039 bool threadIsSuspended; 2040 do { 2041 thread->set_suspend_equivalent(); 2042 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2043 ::SEM_WAIT(sig_sem); 2044 2045 // were we externally suspended while we were waiting? 2046 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2047 if (threadIsSuspended) { 2048 // The semaphore has been incremented, but while we were waiting 2049 // another thread suspended us. We don't want to continue running 2050 // while suspended because that would surprise the thread that 2051 // suspended us. 2052 ::SEM_POST(sig_sem); 2053 2054 thread->java_suspend_self(); 2055 } 2056 } while (threadIsSuspended); 2057 } 2058 } 2059 2060 int os::signal_lookup() { 2061 return check_pending_signals(false); 2062 } 2063 2064 int os::signal_wait() { 2065 return check_pending_signals(true); 2066 } 2067 2068 //////////////////////////////////////////////////////////////////////////////// 2069 // Virtual Memory 2070 2071 int os::vm_page_size() { 2072 // Seems redundant as all get out 2073 assert(os::Bsd::page_size() != -1, "must call os::init"); 2074 return os::Bsd::page_size(); 2075 } 2076 2077 // Solaris allocates memory by pages. 2078 int os::vm_allocation_granularity() { 2079 assert(os::Bsd::page_size() != -1, "must call os::init"); 2080 return os::Bsd::page_size(); 2081 } 2082 2083 // Rationale behind this function: 2084 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2085 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2086 // samples for JITted code. Here we create private executable mapping over the code cache 2087 // and then we can use standard (well, almost, as mapping can change) way to provide 2088 // info for the reporting script by storing timestamp and location of symbol 2089 void bsd_wrap_code(char* base, size_t size) { 2090 static volatile jint cnt = 0; 2091 2092 if (!UseOprofile) { 2093 return; 2094 } 2095 2096 char buf[PATH_MAX + 1]; 2097 int num = Atomic::add(1, &cnt); 2098 2099 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2100 os::get_temp_directory(), os::current_process_id(), num); 2101 unlink(buf); 2102 2103 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2104 2105 if (fd != -1) { 2106 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2107 if (rv != (off_t)-1) { 2108 if (::write(fd, "", 1) == 1) { 2109 mmap(base, size, 2110 PROT_READ|PROT_WRITE|PROT_EXEC, 2111 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2112 } 2113 } 2114 ::close(fd); 2115 unlink(buf); 2116 } 2117 } 2118 2119 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2120 int err) { 2121 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT 2122 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec, 2123 os::errno_name(err), err); 2124 } 2125 2126 // NOTE: Bsd kernel does not really reserve the pages for us. 2127 // All it does is to check if there are enough free pages 2128 // left at the time of mmap(). This could be a potential 2129 // problem. 2130 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2131 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2132 #ifdef __OpenBSD__ 2133 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2134 if (::mprotect(addr, size, prot) == 0) { 2135 return true; 2136 } 2137 #else 2138 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2139 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2140 if (res != (uintptr_t) MAP_FAILED) { 2141 return true; 2142 } 2143 #endif 2144 2145 // Warn about any commit errors we see in non-product builds just 2146 // in case mmap() doesn't work as described on the man page. 2147 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2148 2149 return false; 2150 } 2151 2152 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2153 bool exec) { 2154 // alignment_hint is ignored on this OS 2155 return pd_commit_memory(addr, size, exec); 2156 } 2157 2158 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2159 const char* mesg) { 2160 assert(mesg != NULL, "mesg must be specified"); 2161 if (!pd_commit_memory(addr, size, exec)) { 2162 // add extra info in product mode for vm_exit_out_of_memory(): 2163 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2164 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2165 } 2166 } 2167 2168 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2169 size_t alignment_hint, bool exec, 2170 const char* mesg) { 2171 // alignment_hint is ignored on this OS 2172 pd_commit_memory_or_exit(addr, size, exec, mesg); 2173 } 2174 2175 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2176 } 2177 2178 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2179 ::madvise(addr, bytes, MADV_DONTNEED); 2180 } 2181 2182 void os::numa_make_global(char *addr, size_t bytes) { 2183 } 2184 2185 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2186 } 2187 2188 bool os::numa_topology_changed() { return false; } 2189 2190 size_t os::numa_get_groups_num() { 2191 return 1; 2192 } 2193 2194 int os::numa_get_group_id() { 2195 return 0; 2196 } 2197 2198 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2199 if (size > 0) { 2200 ids[0] = 0; 2201 return 1; 2202 } 2203 return 0; 2204 } 2205 2206 bool os::get_page_info(char *start, page_info* info) { 2207 return false; 2208 } 2209 2210 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2211 return end; 2212 } 2213 2214 2215 bool os::pd_uncommit_memory(char* addr, size_t size) { 2216 #ifdef __OpenBSD__ 2217 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2218 return ::mprotect(addr, size, PROT_NONE) == 0; 2219 #else 2220 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2221 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2222 return res != (uintptr_t) MAP_FAILED; 2223 #endif 2224 } 2225 2226 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2227 return os::commit_memory(addr, size, !ExecMem); 2228 } 2229 2230 // If this is a growable mapping, remove the guard pages entirely by 2231 // munmap()ping them. If not, just call uncommit_memory(). 2232 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2233 return os::uncommit_memory(addr, size); 2234 } 2235 2236 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2237 // at 'requested_addr'. If there are existing memory mappings at the same 2238 // location, however, they will be overwritten. If 'fixed' is false, 2239 // 'requested_addr' is only treated as a hint, the return value may or 2240 // may not start from the requested address. Unlike Bsd mmap(), this 2241 // function returns NULL to indicate failure. 2242 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2243 char * addr; 2244 int flags; 2245 2246 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2247 if (fixed) { 2248 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2249 flags |= MAP_FIXED; 2250 } 2251 2252 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2253 // touch an uncommitted page. Otherwise, the read/write might 2254 // succeed if we have enough swap space to back the physical page. 2255 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2256 flags, -1, 0); 2257 2258 return addr == MAP_FAILED ? NULL : addr; 2259 } 2260 2261 static int anon_munmap(char * addr, size_t size) { 2262 return ::munmap(addr, size) == 0; 2263 } 2264 2265 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2266 size_t alignment_hint) { 2267 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2268 } 2269 2270 bool os::pd_release_memory(char* addr, size_t size) { 2271 return anon_munmap(addr, size); 2272 } 2273 2274 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2275 // Bsd wants the mprotect address argument to be page aligned. 2276 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size()); 2277 2278 // According to SUSv3, mprotect() should only be used with mappings 2279 // established by mmap(), and mmap() always maps whole pages. Unaligned 2280 // 'addr' likely indicates problem in the VM (e.g. trying to change 2281 // protection of malloc'ed or statically allocated memory). Check the 2282 // caller if you hit this assert. 2283 assert(addr == bottom, "sanity check"); 2284 2285 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2286 return ::mprotect(bottom, size, prot) == 0; 2287 } 2288 2289 // Set protections specified 2290 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2291 bool is_committed) { 2292 unsigned int p = 0; 2293 switch (prot) { 2294 case MEM_PROT_NONE: p = PROT_NONE; break; 2295 case MEM_PROT_READ: p = PROT_READ; break; 2296 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2297 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2298 default: 2299 ShouldNotReachHere(); 2300 } 2301 // is_committed is unused. 2302 return bsd_mprotect(addr, bytes, p); 2303 } 2304 2305 bool os::guard_memory(char* addr, size_t size) { 2306 return bsd_mprotect(addr, size, PROT_NONE); 2307 } 2308 2309 bool os::unguard_memory(char* addr, size_t size) { 2310 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2311 } 2312 2313 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2314 return false; 2315 } 2316 2317 // Large page support 2318 2319 static size_t _large_page_size = 0; 2320 2321 void os::large_page_init() { 2322 } 2323 2324 2325 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2326 fatal("This code is not used or maintained."); 2327 2328 // "exec" is passed in but not used. Creating the shared image for 2329 // the code cache doesn't have an SHM_X executable permission to check. 2330 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2331 2332 key_t key = IPC_PRIVATE; 2333 char *addr; 2334 2335 bool warn_on_failure = UseLargePages && 2336 (!FLAG_IS_DEFAULT(UseLargePages) || 2337 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2338 2339 // Create a large shared memory region to attach to based on size. 2340 // Currently, size is the total size of the heap 2341 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2342 if (shmid == -1) { 2343 // Possible reasons for shmget failure: 2344 // 1. shmmax is too small for Java heap. 2345 // > check shmmax value: cat /proc/sys/kernel/shmmax 2346 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2347 // 2. not enough large page memory. 2348 // > check available large pages: cat /proc/meminfo 2349 // > increase amount of large pages: 2350 // echo new_value > /proc/sys/vm/nr_hugepages 2351 // Note 1: different Bsd may use different name for this property, 2352 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2353 // Note 2: it's possible there's enough physical memory available but 2354 // they are so fragmented after a long run that they can't 2355 // coalesce into large pages. Try to reserve large pages when 2356 // the system is still "fresh". 2357 if (warn_on_failure) { 2358 warning("Failed to reserve shared memory (errno = %d).", errno); 2359 } 2360 return NULL; 2361 } 2362 2363 // attach to the region 2364 addr = (char*)shmat(shmid, req_addr, 0); 2365 int err = errno; 2366 2367 // Remove shmid. If shmat() is successful, the actual shared memory segment 2368 // will be deleted when it's detached by shmdt() or when the process 2369 // terminates. If shmat() is not successful this will remove the shared 2370 // segment immediately. 2371 shmctl(shmid, IPC_RMID, NULL); 2372 2373 if ((intptr_t)addr == -1) { 2374 if (warn_on_failure) { 2375 warning("Failed to attach shared memory (errno = %d).", err); 2376 } 2377 return NULL; 2378 } 2379 2380 // The memory is committed 2381 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2382 2383 return addr; 2384 } 2385 2386 bool os::release_memory_special(char* base, size_t bytes) { 2387 if (MemTracker::tracking_level() > NMT_minimal) { 2388 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2389 // detaching the SHM segment will also delete it, see reserve_memory_special() 2390 int rslt = shmdt(base); 2391 if (rslt == 0) { 2392 tkr.record((address)base, bytes); 2393 return true; 2394 } else { 2395 return false; 2396 } 2397 } else { 2398 return shmdt(base) == 0; 2399 } 2400 } 2401 2402 size_t os::large_page_size() { 2403 return _large_page_size; 2404 } 2405 2406 // HugeTLBFS allows application to commit large page memory on demand; 2407 // with SysV SHM the entire memory region must be allocated as shared 2408 // memory. 2409 bool os::can_commit_large_page_memory() { 2410 return UseHugeTLBFS; 2411 } 2412 2413 bool os::can_execute_large_page_memory() { 2414 return UseHugeTLBFS; 2415 } 2416 2417 // Reserve memory at an arbitrary address, only if that area is 2418 // available (and not reserved for something else). 2419 2420 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2421 const int max_tries = 10; 2422 char* base[max_tries]; 2423 size_t size[max_tries]; 2424 const size_t gap = 0x000000; 2425 2426 // Assert only that the size is a multiple of the page size, since 2427 // that's all that mmap requires, and since that's all we really know 2428 // about at this low abstraction level. If we need higher alignment, 2429 // we can either pass an alignment to this method or verify alignment 2430 // in one of the methods further up the call chain. See bug 5044738. 2431 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2432 2433 // Repeatedly allocate blocks until the block is allocated at the 2434 // right spot. 2435 2436 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2437 // if kernel honors the hint then we can return immediately. 2438 char * addr = anon_mmap(requested_addr, bytes, false); 2439 if (addr == requested_addr) { 2440 return requested_addr; 2441 } 2442 2443 if (addr != NULL) { 2444 // mmap() is successful but it fails to reserve at the requested address 2445 anon_munmap(addr, bytes); 2446 } 2447 2448 int i; 2449 for (i = 0; i < max_tries; ++i) { 2450 base[i] = reserve_memory(bytes); 2451 2452 if (base[i] != NULL) { 2453 // Is this the block we wanted? 2454 if (base[i] == requested_addr) { 2455 size[i] = bytes; 2456 break; 2457 } 2458 2459 // Does this overlap the block we wanted? Give back the overlapped 2460 // parts and try again. 2461 2462 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2463 if (top_overlap >= 0 && top_overlap < bytes) { 2464 unmap_memory(base[i], top_overlap); 2465 base[i] += top_overlap; 2466 size[i] = bytes - top_overlap; 2467 } else { 2468 size_t bottom_overlap = base[i] + bytes - requested_addr; 2469 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2470 unmap_memory(requested_addr, bottom_overlap); 2471 size[i] = bytes - bottom_overlap; 2472 } else { 2473 size[i] = bytes; 2474 } 2475 } 2476 } 2477 } 2478 2479 // Give back the unused reserved pieces. 2480 2481 for (int j = 0; j < i; ++j) { 2482 if (base[j] != NULL) { 2483 unmap_memory(base[j], size[j]); 2484 } 2485 } 2486 2487 if (i < max_tries) { 2488 return requested_addr; 2489 } else { 2490 return NULL; 2491 } 2492 } 2493 2494 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2495 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2496 } 2497 2498 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2499 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2500 } 2501 2502 void os::naked_short_sleep(jlong ms) { 2503 struct timespec req; 2504 2505 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2506 req.tv_sec = 0; 2507 if (ms > 0) { 2508 req.tv_nsec = (ms % 1000) * 1000000; 2509 } else { 2510 req.tv_nsec = 1; 2511 } 2512 2513 nanosleep(&req, NULL); 2514 2515 return; 2516 } 2517 2518 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2519 void os::infinite_sleep() { 2520 while (true) { // sleep forever ... 2521 ::sleep(100); // ... 100 seconds at a time 2522 } 2523 } 2524 2525 // Used to convert frequent JVM_Yield() to nops 2526 bool os::dont_yield() { 2527 return DontYieldALot; 2528 } 2529 2530 void os::naked_yield() { 2531 sched_yield(); 2532 } 2533 2534 //////////////////////////////////////////////////////////////////////////////// 2535 // thread priority support 2536 2537 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2538 // only supports dynamic priority, static priority must be zero. For real-time 2539 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2540 // However, for large multi-threaded applications, SCHED_RR is not only slower 2541 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2542 // of 5 runs - Sep 2005). 2543 // 2544 // The following code actually changes the niceness of kernel-thread/LWP. It 2545 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2546 // not the entire user process, and user level threads are 1:1 mapped to kernel 2547 // threads. It has always been the case, but could change in the future. For 2548 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2549 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2550 2551 #if !defined(__APPLE__) 2552 int os::java_to_os_priority[CriticalPriority + 1] = { 2553 19, // 0 Entry should never be used 2554 2555 0, // 1 MinPriority 2556 3, // 2 2557 6, // 3 2558 2559 10, // 4 2560 15, // 5 NormPriority 2561 18, // 6 2562 2563 21, // 7 2564 25, // 8 2565 28, // 9 NearMaxPriority 2566 2567 31, // 10 MaxPriority 2568 2569 31 // 11 CriticalPriority 2570 }; 2571 #else 2572 // Using Mach high-level priority assignments 2573 int os::java_to_os_priority[CriticalPriority + 1] = { 2574 0, // 0 Entry should never be used (MINPRI_USER) 2575 2576 27, // 1 MinPriority 2577 28, // 2 2578 29, // 3 2579 2580 30, // 4 2581 31, // 5 NormPriority (BASEPRI_DEFAULT) 2582 32, // 6 2583 2584 33, // 7 2585 34, // 8 2586 35, // 9 NearMaxPriority 2587 2588 36, // 10 MaxPriority 2589 2590 36 // 11 CriticalPriority 2591 }; 2592 #endif 2593 2594 static int prio_init() { 2595 if (ThreadPriorityPolicy == 1) { 2596 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2597 // if effective uid is not root. Perhaps, a more elegant way of doing 2598 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2599 if (geteuid() != 0) { 2600 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2601 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2602 } 2603 ThreadPriorityPolicy = 0; 2604 } 2605 } 2606 if (UseCriticalJavaThreadPriority) { 2607 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2608 } 2609 return 0; 2610 } 2611 2612 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2613 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2614 2615 #ifdef __OpenBSD__ 2616 // OpenBSD pthread_setprio starves low priority threads 2617 return OS_OK; 2618 #elif defined(__FreeBSD__) 2619 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2620 #elif defined(__APPLE__) || defined(__NetBSD__) 2621 struct sched_param sp; 2622 int policy; 2623 pthread_t self = pthread_self(); 2624 2625 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2626 return OS_ERR; 2627 } 2628 2629 sp.sched_priority = newpri; 2630 if (pthread_setschedparam(self, policy, &sp) != 0) { 2631 return OS_ERR; 2632 } 2633 2634 return OS_OK; 2635 #else 2636 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2637 return (ret == 0) ? OS_OK : OS_ERR; 2638 #endif 2639 } 2640 2641 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2642 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2643 *priority_ptr = java_to_os_priority[NormPriority]; 2644 return OS_OK; 2645 } 2646 2647 errno = 0; 2648 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2649 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2650 #elif defined(__APPLE__) || defined(__NetBSD__) 2651 int policy; 2652 struct sched_param sp; 2653 2654 pthread_getschedparam(pthread_self(), &policy, &sp); 2655 *priority_ptr = sp.sched_priority; 2656 #else 2657 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2658 #endif 2659 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2660 } 2661 2662 // Hint to the underlying OS that a task switch would not be good. 2663 // Void return because it's a hint and can fail. 2664 void os::hint_no_preempt() {} 2665 2666 //////////////////////////////////////////////////////////////////////////////// 2667 // suspend/resume support 2668 2669 // The low-level signal-based suspend/resume support is a remnant from the 2670 // old VM-suspension that used to be for java-suspension, safepoints etc, 2671 // within hotspot. Needed for fetch_frame_from_ucontext(), which is used by: 2672 // - Forte Analyzer: AsyncGetCallTrace() 2673 // - StackBanging: get_frame_at_stack_banging_point() 2674 // 2675 // The remaining code is greatly simplified from the more general suspension 2676 // code that used to be used. 2677 // 2678 // The protocol is quite simple: 2679 // - suspend: 2680 // - sends a signal to the target thread 2681 // - polls the suspend state of the osthread using a yield loop 2682 // - target thread signal handler (SR_handler) sets suspend state 2683 // and blocks in sigsuspend until continued 2684 // - resume: 2685 // - sets target osthread state to continue 2686 // - sends signal to end the sigsuspend loop in the SR_handler 2687 // 2688 // Note that the SR_lock plays no role in this suspend/resume protocol, 2689 // but is checked for NULL in SR_handler as a thread termination indicator. 2690 2691 static void resume_clear_context(OSThread *osthread) { 2692 osthread->set_ucontext(NULL); 2693 osthread->set_siginfo(NULL); 2694 } 2695 2696 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2697 osthread->set_ucontext(context); 2698 osthread->set_siginfo(siginfo); 2699 } 2700 2701 // Handler function invoked when a thread's execution is suspended or 2702 // resumed. We have to be careful that only async-safe functions are 2703 // called here (Note: most pthread functions are not async safe and 2704 // should be avoided.) 2705 // 2706 // Note: sigwait() is a more natural fit than sigsuspend() from an 2707 // interface point of view, but sigwait() prevents the signal hander 2708 // from being run. libpthread would get very confused by not having 2709 // its signal handlers run and prevents sigwait()'s use with the 2710 // mutex granting granting signal. 2711 // 2712 // Currently only ever called on the VMThread or JavaThread 2713 // 2714 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2715 // Save and restore errno to avoid confusing native code with EINTR 2716 // after sigsuspend. 2717 int old_errno = errno; 2718 2719 Thread* thread = Thread::current_or_null_safe(); 2720 assert(thread != NULL, "Missing current thread in SR_handler"); 2721 2722 // On some systems we have seen signal delivery get "stuck" until the signal 2723 // mask is changed as part of thread termination. Check that the current thread 2724 // has not already terminated (via SR_lock()) - else the following assertion 2725 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2726 // destructor has completed. 2727 2728 if (thread->SR_lock() == NULL) { 2729 return; 2730 } 2731 2732 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2733 2734 OSThread* osthread = thread->osthread(); 2735 2736 os::SuspendResume::State current = osthread->sr.state(); 2737 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2738 suspend_save_context(osthread, siginfo, context); 2739 2740 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2741 os::SuspendResume::State state = osthread->sr.suspended(); 2742 if (state == os::SuspendResume::SR_SUSPENDED) { 2743 sigset_t suspend_set; // signals for sigsuspend() 2744 2745 // get current set of blocked signals and unblock resume signal 2746 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2747 sigdelset(&suspend_set, SR_signum); 2748 2749 sr_semaphore.signal(); 2750 // wait here until we are resumed 2751 while (1) { 2752 sigsuspend(&suspend_set); 2753 2754 os::SuspendResume::State result = osthread->sr.running(); 2755 if (result == os::SuspendResume::SR_RUNNING) { 2756 sr_semaphore.signal(); 2757 break; 2758 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2759 ShouldNotReachHere(); 2760 } 2761 } 2762 2763 } else if (state == os::SuspendResume::SR_RUNNING) { 2764 // request was cancelled, continue 2765 } else { 2766 ShouldNotReachHere(); 2767 } 2768 2769 resume_clear_context(osthread); 2770 } else if (current == os::SuspendResume::SR_RUNNING) { 2771 // request was cancelled, continue 2772 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2773 // ignore 2774 } else { 2775 // ignore 2776 } 2777 2778 errno = old_errno; 2779 } 2780 2781 2782 static int SR_initialize() { 2783 struct sigaction act; 2784 char *s; 2785 // Get signal number to use for suspend/resume 2786 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2787 int sig = ::strtol(s, 0, 10); 2788 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2789 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2790 SR_signum = sig; 2791 } else { 2792 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2793 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2794 } 2795 } 2796 2797 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2798 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2799 2800 sigemptyset(&SR_sigset); 2801 sigaddset(&SR_sigset, SR_signum); 2802 2803 // Set up signal handler for suspend/resume 2804 act.sa_flags = SA_RESTART|SA_SIGINFO; 2805 act.sa_handler = (void (*)(int)) SR_handler; 2806 2807 // SR_signum is blocked by default. 2808 // 4528190 - We also need to block pthread restart signal (32 on all 2809 // supported Bsd platforms). Note that BsdThreads need to block 2810 // this signal for all threads to work properly. So we don't have 2811 // to use hard-coded signal number when setting up the mask. 2812 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2813 2814 if (sigaction(SR_signum, &act, 0) == -1) { 2815 return -1; 2816 } 2817 2818 // Save signal flag 2819 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2820 return 0; 2821 } 2822 2823 static int sr_notify(OSThread* osthread) { 2824 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2825 assert_status(status == 0, status, "pthread_kill"); 2826 return status; 2827 } 2828 2829 // "Randomly" selected value for how long we want to spin 2830 // before bailing out on suspending a thread, also how often 2831 // we send a signal to a thread we want to resume 2832 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2833 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2834 2835 // returns true on success and false on error - really an error is fatal 2836 // but this seems the normal response to library errors 2837 static bool do_suspend(OSThread* osthread) { 2838 assert(osthread->sr.is_running(), "thread should be running"); 2839 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2840 2841 // mark as suspended and send signal 2842 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2843 // failed to switch, state wasn't running? 2844 ShouldNotReachHere(); 2845 return false; 2846 } 2847 2848 if (sr_notify(osthread) != 0) { 2849 ShouldNotReachHere(); 2850 } 2851 2852 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2853 while (true) { 2854 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2855 break; 2856 } else { 2857 // timeout 2858 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2859 if (cancelled == os::SuspendResume::SR_RUNNING) { 2860 return false; 2861 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2862 // make sure that we consume the signal on the semaphore as well 2863 sr_semaphore.wait(); 2864 break; 2865 } else { 2866 ShouldNotReachHere(); 2867 return false; 2868 } 2869 } 2870 } 2871 2872 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2873 return true; 2874 } 2875 2876 static void do_resume(OSThread* osthread) { 2877 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2878 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2879 2880 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2881 // failed to switch to WAKEUP_REQUEST 2882 ShouldNotReachHere(); 2883 return; 2884 } 2885 2886 while (true) { 2887 if (sr_notify(osthread) == 0) { 2888 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2889 if (osthread->sr.is_running()) { 2890 return; 2891 } 2892 } 2893 } else { 2894 ShouldNotReachHere(); 2895 } 2896 } 2897 2898 guarantee(osthread->sr.is_running(), "Must be running!"); 2899 } 2900 2901 /////////////////////////////////////////////////////////////////////////////////// 2902 // signal handling (except suspend/resume) 2903 2904 // This routine may be used by user applications as a "hook" to catch signals. 2905 // The user-defined signal handler must pass unrecognized signals to this 2906 // routine, and if it returns true (non-zero), then the signal handler must 2907 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2908 // routine will never retun false (zero), but instead will execute a VM panic 2909 // routine kill the process. 2910 // 2911 // If this routine returns false, it is OK to call it again. This allows 2912 // the user-defined signal handler to perform checks either before or after 2913 // the VM performs its own checks. Naturally, the user code would be making 2914 // a serious error if it tried to handle an exception (such as a null check 2915 // or breakpoint) that the VM was generating for its own correct operation. 2916 // 2917 // This routine may recognize any of the following kinds of signals: 2918 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2919 // It should be consulted by handlers for any of those signals. 2920 // 2921 // The caller of this routine must pass in the three arguments supplied 2922 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2923 // field of the structure passed to sigaction(). This routine assumes that 2924 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2925 // 2926 // Note that the VM will print warnings if it detects conflicting signal 2927 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2928 // 2929 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2930 void* ucontext, 2931 int abort_if_unrecognized); 2932 2933 void signalHandler(int sig, siginfo_t* info, void* uc) { 2934 assert(info != NULL && uc != NULL, "it must be old kernel"); 2935 int orig_errno = errno; // Preserve errno value over signal handler. 2936 JVM_handle_bsd_signal(sig, info, uc, true); 2937 errno = orig_errno; 2938 } 2939 2940 2941 // This boolean allows users to forward their own non-matching signals 2942 // to JVM_handle_bsd_signal, harmlessly. 2943 bool os::Bsd::signal_handlers_are_installed = false; 2944 2945 // For signal-chaining 2946 struct sigaction sigact[NSIG]; 2947 uint32_t sigs = 0; 2948 #if (32 < NSIG-1) 2949 #error "Not all signals can be encoded in sigs. Adapt its type!" 2950 #endif 2951 bool os::Bsd::libjsig_is_loaded = false; 2952 typedef struct sigaction *(*get_signal_t)(int); 2953 get_signal_t os::Bsd::get_signal_action = NULL; 2954 2955 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2956 struct sigaction *actp = NULL; 2957 2958 if (libjsig_is_loaded) { 2959 // Retrieve the old signal handler from libjsig 2960 actp = (*get_signal_action)(sig); 2961 } 2962 if (actp == NULL) { 2963 // Retrieve the preinstalled signal handler from jvm 2964 actp = get_preinstalled_handler(sig); 2965 } 2966 2967 return actp; 2968 } 2969 2970 static bool call_chained_handler(struct sigaction *actp, int sig, 2971 siginfo_t *siginfo, void *context) { 2972 // Call the old signal handler 2973 if (actp->sa_handler == SIG_DFL) { 2974 // It's more reasonable to let jvm treat it as an unexpected exception 2975 // instead of taking the default action. 2976 return false; 2977 } else if (actp->sa_handler != SIG_IGN) { 2978 if ((actp->sa_flags & SA_NODEFER) == 0) { 2979 // automaticlly block the signal 2980 sigaddset(&(actp->sa_mask), sig); 2981 } 2982 2983 sa_handler_t hand; 2984 sa_sigaction_t sa; 2985 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2986 // retrieve the chained handler 2987 if (siginfo_flag_set) { 2988 sa = actp->sa_sigaction; 2989 } else { 2990 hand = actp->sa_handler; 2991 } 2992 2993 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2994 actp->sa_handler = SIG_DFL; 2995 } 2996 2997 // try to honor the signal mask 2998 sigset_t oset; 2999 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3000 3001 // call into the chained handler 3002 if (siginfo_flag_set) { 3003 (*sa)(sig, siginfo, context); 3004 } else { 3005 (*hand)(sig); 3006 } 3007 3008 // restore the signal mask 3009 pthread_sigmask(SIG_SETMASK, &oset, 0); 3010 } 3011 // Tell jvm's signal handler the signal is taken care of. 3012 return true; 3013 } 3014 3015 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3016 bool chained = false; 3017 // signal-chaining 3018 if (UseSignalChaining) { 3019 struct sigaction *actp = get_chained_signal_action(sig); 3020 if (actp != NULL) { 3021 chained = call_chained_handler(actp, sig, siginfo, context); 3022 } 3023 } 3024 return chained; 3025 } 3026 3027 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3028 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 3029 return &sigact[sig]; 3030 } 3031 return NULL; 3032 } 3033 3034 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3035 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3036 sigact[sig] = oldAct; 3037 sigs |= (uint32_t)1 << (sig-1); 3038 } 3039 3040 // for diagnostic 3041 int sigflags[NSIG]; 3042 3043 int os::Bsd::get_our_sigflags(int sig) { 3044 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3045 return sigflags[sig]; 3046 } 3047 3048 void os::Bsd::set_our_sigflags(int sig, int flags) { 3049 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3050 if (sig > 0 && sig < NSIG) { 3051 sigflags[sig] = flags; 3052 } 3053 } 3054 3055 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3056 // Check for overwrite. 3057 struct sigaction oldAct; 3058 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3059 3060 void* oldhand = oldAct.sa_sigaction 3061 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3062 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3063 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3064 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3065 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3066 if (AllowUserSignalHandlers || !set_installed) { 3067 // Do not overwrite; user takes responsibility to forward to us. 3068 return; 3069 } else if (UseSignalChaining) { 3070 // save the old handler in jvm 3071 save_preinstalled_handler(sig, oldAct); 3072 // libjsig also interposes the sigaction() call below and saves the 3073 // old sigaction on it own. 3074 } else { 3075 fatal("Encountered unexpected pre-existing sigaction handler " 3076 "%#lx for signal %d.", (long)oldhand, sig); 3077 } 3078 } 3079 3080 struct sigaction sigAct; 3081 sigfillset(&(sigAct.sa_mask)); 3082 sigAct.sa_handler = SIG_DFL; 3083 if (!set_installed) { 3084 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3085 } else { 3086 sigAct.sa_sigaction = signalHandler; 3087 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3088 } 3089 #ifdef __APPLE__ 3090 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3091 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3092 // if the signal handler declares it will handle it on alternate stack. 3093 // Notice we only declare we will handle it on alt stack, but we are not 3094 // actually going to use real alt stack - this is just a workaround. 3095 // Please see ux_exception.c, method catch_mach_exception_raise for details 3096 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3097 if (sig == SIGSEGV) { 3098 sigAct.sa_flags |= SA_ONSTACK; 3099 } 3100 #endif 3101 3102 // Save flags, which are set by ours 3103 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3104 sigflags[sig] = sigAct.sa_flags; 3105 3106 int ret = sigaction(sig, &sigAct, &oldAct); 3107 assert(ret == 0, "check"); 3108 3109 void* oldhand2 = oldAct.sa_sigaction 3110 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3111 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3112 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3113 } 3114 3115 // install signal handlers for signals that HotSpot needs to 3116 // handle in order to support Java-level exception handling. 3117 3118 void os::Bsd::install_signal_handlers() { 3119 if (!signal_handlers_are_installed) { 3120 signal_handlers_are_installed = true; 3121 3122 // signal-chaining 3123 typedef void (*signal_setting_t)(); 3124 signal_setting_t begin_signal_setting = NULL; 3125 signal_setting_t end_signal_setting = NULL; 3126 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3127 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3128 if (begin_signal_setting != NULL) { 3129 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3130 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3131 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3132 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3133 libjsig_is_loaded = true; 3134 assert(UseSignalChaining, "should enable signal-chaining"); 3135 } 3136 if (libjsig_is_loaded) { 3137 // Tell libjsig jvm is setting signal handlers 3138 (*begin_signal_setting)(); 3139 } 3140 3141 set_signal_handler(SIGSEGV, true); 3142 set_signal_handler(SIGPIPE, true); 3143 set_signal_handler(SIGBUS, true); 3144 set_signal_handler(SIGILL, true); 3145 set_signal_handler(SIGFPE, true); 3146 set_signal_handler(SIGXFSZ, true); 3147 3148 #if defined(__APPLE__) 3149 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3150 // signals caught and handled by the JVM. To work around this, we reset the mach task 3151 // signal handler that's placed on our process by CrashReporter. This disables 3152 // CrashReporter-based reporting. 3153 // 3154 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3155 // on caught fatal signals. 3156 // 3157 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3158 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3159 // exception handling, while leaving the standard BSD signal handlers functional. 3160 kern_return_t kr; 3161 kr = task_set_exception_ports(mach_task_self(), 3162 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3163 MACH_PORT_NULL, 3164 EXCEPTION_STATE_IDENTITY, 3165 MACHINE_THREAD_STATE); 3166 3167 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3168 #endif 3169 3170 if (libjsig_is_loaded) { 3171 // Tell libjsig jvm finishes setting signal handlers 3172 (*end_signal_setting)(); 3173 } 3174 3175 // We don't activate signal checker if libjsig is in place, we trust ourselves 3176 // and if UserSignalHandler is installed all bets are off 3177 if (CheckJNICalls) { 3178 if (libjsig_is_loaded) { 3179 if (PrintJNIResolving) { 3180 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3181 } 3182 check_signals = false; 3183 } 3184 if (AllowUserSignalHandlers) { 3185 if (PrintJNIResolving) { 3186 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3187 } 3188 check_signals = false; 3189 } 3190 } 3191 } 3192 } 3193 3194 3195 ///// 3196 // glibc on Bsd platform uses non-documented flag 3197 // to indicate, that some special sort of signal 3198 // trampoline is used. 3199 // We will never set this flag, and we should 3200 // ignore this flag in our diagnostic 3201 #ifdef SIGNIFICANT_SIGNAL_MASK 3202 #undef SIGNIFICANT_SIGNAL_MASK 3203 #endif 3204 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3205 3206 static const char* get_signal_handler_name(address handler, 3207 char* buf, int buflen) { 3208 int offset; 3209 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3210 if (found) { 3211 // skip directory names 3212 const char *p1, *p2; 3213 p1 = buf; 3214 size_t len = strlen(os::file_separator()); 3215 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3216 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3217 } else { 3218 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3219 } 3220 return buf; 3221 } 3222 3223 static void print_signal_handler(outputStream* st, int sig, 3224 char* buf, size_t buflen) { 3225 struct sigaction sa; 3226 3227 sigaction(sig, NULL, &sa); 3228 3229 // See comment for SIGNIFICANT_SIGNAL_MASK define 3230 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3231 3232 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3233 3234 address handler = (sa.sa_flags & SA_SIGINFO) 3235 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3236 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3237 3238 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3239 st->print("SIG_DFL"); 3240 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3241 st->print("SIG_IGN"); 3242 } else { 3243 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3244 } 3245 3246 st->print(", sa_mask[0]="); 3247 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3248 3249 address rh = VMError::get_resetted_sighandler(sig); 3250 // May be, handler was resetted by VMError? 3251 if (rh != NULL) { 3252 handler = rh; 3253 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3254 } 3255 3256 st->print(", sa_flags="); 3257 os::Posix::print_sa_flags(st, sa.sa_flags); 3258 3259 // Check: is it our handler? 3260 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3261 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3262 // It is our signal handler 3263 // check for flags, reset system-used one! 3264 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3265 st->print( 3266 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3267 os::Bsd::get_our_sigflags(sig)); 3268 } 3269 } 3270 st->cr(); 3271 } 3272 3273 3274 #define DO_SIGNAL_CHECK(sig) \ 3275 do { \ 3276 if (!sigismember(&check_signal_done, sig)) { \ 3277 os::Bsd::check_signal_handler(sig); \ 3278 } \ 3279 } while (0) 3280 3281 // This method is a periodic task to check for misbehaving JNI applications 3282 // under CheckJNI, we can add any periodic checks here 3283 3284 void os::run_periodic_checks() { 3285 3286 if (check_signals == false) return; 3287 3288 // SEGV and BUS if overridden could potentially prevent 3289 // generation of hs*.log in the event of a crash, debugging 3290 // such a case can be very challenging, so we absolutely 3291 // check the following for a good measure: 3292 DO_SIGNAL_CHECK(SIGSEGV); 3293 DO_SIGNAL_CHECK(SIGILL); 3294 DO_SIGNAL_CHECK(SIGFPE); 3295 DO_SIGNAL_CHECK(SIGBUS); 3296 DO_SIGNAL_CHECK(SIGPIPE); 3297 DO_SIGNAL_CHECK(SIGXFSZ); 3298 3299 3300 // ReduceSignalUsage allows the user to override these handlers 3301 // see comments at the very top and jvm_solaris.h 3302 if (!ReduceSignalUsage) { 3303 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3304 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3305 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3306 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3307 } 3308 3309 DO_SIGNAL_CHECK(SR_signum); 3310 } 3311 3312 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3313 3314 static os_sigaction_t os_sigaction = NULL; 3315 3316 void os::Bsd::check_signal_handler(int sig) { 3317 char buf[O_BUFLEN]; 3318 address jvmHandler = NULL; 3319 3320 3321 struct sigaction act; 3322 if (os_sigaction == NULL) { 3323 // only trust the default sigaction, in case it has been interposed 3324 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3325 if (os_sigaction == NULL) return; 3326 } 3327 3328 os_sigaction(sig, (struct sigaction*)NULL, &act); 3329 3330 3331 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3332 3333 address thisHandler = (act.sa_flags & SA_SIGINFO) 3334 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3335 : CAST_FROM_FN_PTR(address, act.sa_handler); 3336 3337 3338 switch (sig) { 3339 case SIGSEGV: 3340 case SIGBUS: 3341 case SIGFPE: 3342 case SIGPIPE: 3343 case SIGILL: 3344 case SIGXFSZ: 3345 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3346 break; 3347 3348 case SHUTDOWN1_SIGNAL: 3349 case SHUTDOWN2_SIGNAL: 3350 case SHUTDOWN3_SIGNAL: 3351 case BREAK_SIGNAL: 3352 jvmHandler = (address)user_handler(); 3353 break; 3354 3355 default: 3356 if (sig == SR_signum) { 3357 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3358 } else { 3359 return; 3360 } 3361 break; 3362 } 3363 3364 if (thisHandler != jvmHandler) { 3365 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3366 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3367 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3368 // No need to check this sig any longer 3369 sigaddset(&check_signal_done, sig); 3370 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3371 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3372 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3373 exception_name(sig, buf, O_BUFLEN)); 3374 } 3375 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3376 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3377 tty->print("expected:"); 3378 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3379 tty->cr(); 3380 tty->print(" found:"); 3381 os::Posix::print_sa_flags(tty, act.sa_flags); 3382 tty->cr(); 3383 // No need to check this sig any longer 3384 sigaddset(&check_signal_done, sig); 3385 } 3386 3387 // Dump all the signal 3388 if (sigismember(&check_signal_done, sig)) { 3389 print_signal_handlers(tty, buf, O_BUFLEN); 3390 } 3391 } 3392 3393 extern void report_error(char* file_name, int line_no, char* title, 3394 char* format, ...); 3395 3396 // this is called _before_ the most of global arguments have been parsed 3397 void os::init(void) { 3398 char dummy; // used to get a guess on initial stack address 3399 3400 // With BsdThreads the JavaMain thread pid (primordial thread) 3401 // is different than the pid of the java launcher thread. 3402 // So, on Bsd, the launcher thread pid is passed to the VM 3403 // via the sun.java.launcher.pid property. 3404 // Use this property instead of getpid() if it was correctly passed. 3405 // See bug 6351349. 3406 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3407 3408 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3409 3410 clock_tics_per_sec = CLK_TCK; 3411 3412 init_random(1234567); 3413 3414 ThreadCritical::initialize(); 3415 3416 Bsd::set_page_size(getpagesize()); 3417 if (Bsd::page_size() == -1) { 3418 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3419 } 3420 init_page_sizes((size_t) Bsd::page_size()); 3421 3422 Bsd::initialize_system_info(); 3423 3424 // main_thread points to the aboriginal thread 3425 Bsd::_main_thread = pthread_self(); 3426 3427 Bsd::clock_init(); 3428 initial_time_count = javaTimeNanos(); 3429 3430 #ifdef __APPLE__ 3431 // XXXDARWIN 3432 // Work around the unaligned VM callbacks in hotspot's 3433 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3434 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3435 // alignment when doing symbol lookup. To work around this, we force early 3436 // binding of all symbols now, thus binding when alignment is known-good. 3437 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3438 #endif 3439 3440 os::Posix::init(); 3441 } 3442 3443 // To install functions for atexit system call 3444 extern "C" { 3445 static void perfMemory_exit_helper() { 3446 perfMemory_exit(); 3447 } 3448 } 3449 3450 // this is called _after_ the global arguments have been parsed 3451 jint os::init_2(void) { 3452 3453 os::Posix::init_2(); 3454 3455 // Allocate a single page and mark it as readable for safepoint polling 3456 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3457 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page"); 3458 3459 os::set_polling_page(polling_page); 3460 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 3461 3462 if (!UseMembar) { 3463 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3464 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3465 os::set_memory_serialize_page(mem_serialize_page); 3466 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 3467 } 3468 3469 // initialize suspend/resume support - must do this before signal_sets_init() 3470 if (SR_initialize() != 0) { 3471 perror("SR_initialize failed"); 3472 return JNI_ERR; 3473 } 3474 3475 Bsd::signal_sets_init(); 3476 Bsd::install_signal_handlers(); 3477 3478 // Check and sets minimum stack sizes against command line options 3479 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3480 return JNI_ERR; 3481 } 3482 3483 if (MaxFDLimit) { 3484 // set the number of file descriptors to max. print out error 3485 // if getrlimit/setrlimit fails but continue regardless. 3486 struct rlimit nbr_files; 3487 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3488 if (status != 0) { 3489 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3490 } else { 3491 nbr_files.rlim_cur = nbr_files.rlim_max; 3492 3493 #ifdef __APPLE__ 3494 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3495 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3496 // be used instead 3497 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3498 #endif 3499 3500 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3501 if (status != 0) { 3502 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3503 } 3504 } 3505 } 3506 3507 // at-exit methods are called in the reverse order of their registration. 3508 // atexit functions are called on return from main or as a result of a 3509 // call to exit(3C). There can be only 32 of these functions registered 3510 // and atexit() does not set errno. 3511 3512 if (PerfAllowAtExitRegistration) { 3513 // only register atexit functions if PerfAllowAtExitRegistration is set. 3514 // atexit functions can be delayed until process exit time, which 3515 // can be problematic for embedded VM situations. Embedded VMs should 3516 // call DestroyJavaVM() to assure that VM resources are released. 3517 3518 // note: perfMemory_exit_helper atexit function may be removed in 3519 // the future if the appropriate cleanup code can be added to the 3520 // VM_Exit VMOperation's doit method. 3521 if (atexit(perfMemory_exit_helper) != 0) { 3522 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3523 } 3524 } 3525 3526 // initialize thread priority policy 3527 prio_init(); 3528 3529 #ifdef __APPLE__ 3530 // dynamically link to objective c gc registration 3531 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3532 if (handleLibObjc != NULL) { 3533 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3534 } 3535 #endif 3536 3537 return JNI_OK; 3538 } 3539 3540 // Mark the polling page as unreadable 3541 void os::make_polling_page_unreadable(void) { 3542 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3543 fatal("Could not disable polling page"); 3544 } 3545 } 3546 3547 // Mark the polling page as readable 3548 void os::make_polling_page_readable(void) { 3549 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3550 fatal("Could not enable polling page"); 3551 } 3552 } 3553 3554 int os::active_processor_count() { 3555 return _processor_count; 3556 } 3557 3558 void os::set_native_thread_name(const char *name) { 3559 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3560 // This is only supported in Snow Leopard and beyond 3561 if (name != NULL) { 3562 // Add a "Java: " prefix to the name 3563 char buf[MAXTHREADNAMESIZE]; 3564 snprintf(buf, sizeof(buf), "Java: %s", name); 3565 pthread_setname_np(buf); 3566 } 3567 #endif 3568 } 3569 3570 bool os::distribute_processes(uint length, uint* distribution) { 3571 // Not yet implemented. 3572 return false; 3573 } 3574 3575 bool os::bind_to_processor(uint processor_id) { 3576 // Not yet implemented. 3577 return false; 3578 } 3579 3580 void os::SuspendedThreadTask::internal_do_task() { 3581 if (do_suspend(_thread->osthread())) { 3582 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3583 do_task(context); 3584 do_resume(_thread->osthread()); 3585 } 3586 } 3587 3588 //////////////////////////////////////////////////////////////////////////////// 3589 // debug support 3590 3591 bool os::find(address addr, outputStream* st) { 3592 Dl_info dlinfo; 3593 memset(&dlinfo, 0, sizeof(dlinfo)); 3594 if (dladdr(addr, &dlinfo) != 0) { 3595 st->print(INTPTR_FORMAT ": ", (intptr_t)addr); 3596 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3597 st->print("%s+%#x", dlinfo.dli_sname, 3598 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr)); 3599 } else if (dlinfo.dli_fbase != NULL) { 3600 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase)); 3601 } else { 3602 st->print("<absolute address>"); 3603 } 3604 if (dlinfo.dli_fname != NULL) { 3605 st->print(" in %s", dlinfo.dli_fname); 3606 } 3607 if (dlinfo.dli_fbase != NULL) { 3608 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase); 3609 } 3610 st->cr(); 3611 3612 if (Verbose) { 3613 // decode some bytes around the PC 3614 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3615 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3616 address lowest = (address) dlinfo.dli_sname; 3617 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3618 if (begin < lowest) begin = lowest; 3619 Dl_info dlinfo2; 3620 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3621 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3622 end = (address) dlinfo2.dli_saddr; 3623 } 3624 Disassembler::decode(begin, end, st); 3625 } 3626 return true; 3627 } 3628 return false; 3629 } 3630 3631 //////////////////////////////////////////////////////////////////////////////// 3632 // misc 3633 3634 // This does not do anything on Bsd. This is basically a hook for being 3635 // able to use structured exception handling (thread-local exception filters) 3636 // on, e.g., Win32. 3637 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3638 const methodHandle& method, JavaCallArguments* args, 3639 Thread* thread) { 3640 f(value, method, args, thread); 3641 } 3642 3643 void os::print_statistics() { 3644 } 3645 3646 bool os::message_box(const char* title, const char* message) { 3647 int i; 3648 fdStream err(defaultStream::error_fd()); 3649 for (i = 0; i < 78; i++) err.print_raw("="); 3650 err.cr(); 3651 err.print_raw_cr(title); 3652 for (i = 0; i < 78; i++) err.print_raw("-"); 3653 err.cr(); 3654 err.print_raw_cr(message); 3655 for (i = 0; i < 78; i++) err.print_raw("="); 3656 err.cr(); 3657 3658 char buf[16]; 3659 // Prevent process from exiting upon "read error" without consuming all CPU 3660 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3661 3662 return buf[0] == 'y' || buf[0] == 'Y'; 3663 } 3664 3665 int os::stat(const char *path, struct stat *sbuf) { 3666 char pathbuf[MAX_PATH]; 3667 if (strlen(path) > MAX_PATH - 1) { 3668 errno = ENAMETOOLONG; 3669 return -1; 3670 } 3671 os::native_path(strcpy(pathbuf, path)); 3672 return ::stat(pathbuf, sbuf); 3673 } 3674 3675 static inline struct timespec get_mtime(const char* filename) { 3676 struct stat st; 3677 int ret = os::stat(filename, &st); 3678 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3679 #ifdef __APPLE__ 3680 return st.st_mtimespec; 3681 #else 3682 return st.st_mtim; 3683 #endif 3684 } 3685 3686 int os::compare_file_modified_times(const char* file1, const char* file2) { 3687 struct timespec filetime1 = get_mtime(file1); 3688 struct timespec filetime2 = get_mtime(file2); 3689 int diff = filetime1.tv_sec - filetime2.tv_sec; 3690 if (diff == 0) { 3691 return filetime1.tv_nsec - filetime2.tv_nsec; 3692 } 3693 return diff; 3694 } 3695 3696 // Is a (classpath) directory empty? 3697 bool os::dir_is_empty(const char* path) { 3698 DIR *dir = NULL; 3699 struct dirent *ptr; 3700 3701 dir = opendir(path); 3702 if (dir == NULL) return true; 3703 3704 // Scan the directory 3705 bool result = true; 3706 char buf[sizeof(struct dirent) + MAX_PATH]; 3707 while (result && (ptr = ::readdir(dir)) != NULL) { 3708 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3709 result = false; 3710 } 3711 } 3712 closedir(dir); 3713 return result; 3714 } 3715 3716 // This code originates from JDK's sysOpen and open64_w 3717 // from src/solaris/hpi/src/system_md.c 3718 3719 int os::open(const char *path, int oflag, int mode) { 3720 if (strlen(path) > MAX_PATH - 1) { 3721 errno = ENAMETOOLONG; 3722 return -1; 3723 } 3724 int fd; 3725 3726 fd = ::open(path, oflag, mode); 3727 if (fd == -1) return -1; 3728 3729 // If the open succeeded, the file might still be a directory 3730 { 3731 struct stat buf; 3732 int ret = ::fstat(fd, &buf); 3733 int st_mode = buf.st_mode; 3734 3735 if (ret != -1) { 3736 if ((st_mode & S_IFMT) == S_IFDIR) { 3737 errno = EISDIR; 3738 ::close(fd); 3739 return -1; 3740 } 3741 } else { 3742 ::close(fd); 3743 return -1; 3744 } 3745 } 3746 3747 // All file descriptors that are opened in the JVM and not 3748 // specifically destined for a subprocess should have the 3749 // close-on-exec flag set. If we don't set it, then careless 3rd 3750 // party native code might fork and exec without closing all 3751 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3752 // UNIXProcess.c), and this in turn might: 3753 // 3754 // - cause end-of-file to fail to be detected on some file 3755 // descriptors, resulting in mysterious hangs, or 3756 // 3757 // - might cause an fopen in the subprocess to fail on a system 3758 // suffering from bug 1085341. 3759 // 3760 // (Yes, the default setting of the close-on-exec flag is a Unix 3761 // design flaw) 3762 // 3763 // See: 3764 // 1085341: 32-bit stdio routines should support file descriptors >255 3765 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3766 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3767 // 3768 #ifdef FD_CLOEXEC 3769 { 3770 int flags = ::fcntl(fd, F_GETFD); 3771 if (flags != -1) { 3772 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3773 } 3774 } 3775 #endif 3776 3777 return fd; 3778 } 3779 3780 3781 // create binary file, rewriting existing file if required 3782 int os::create_binary_file(const char* path, bool rewrite_existing) { 3783 int oflags = O_WRONLY | O_CREAT; 3784 if (!rewrite_existing) { 3785 oflags |= O_EXCL; 3786 } 3787 return ::open(path, oflags, S_IREAD | S_IWRITE); 3788 } 3789 3790 // return current position of file pointer 3791 jlong os::current_file_offset(int fd) { 3792 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3793 } 3794 3795 // move file pointer to the specified offset 3796 jlong os::seek_to_file_offset(int fd, jlong offset) { 3797 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3798 } 3799 3800 // This code originates from JDK's sysAvailable 3801 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3802 3803 int os::available(int fd, jlong *bytes) { 3804 jlong cur, end; 3805 int mode; 3806 struct stat buf; 3807 3808 if (::fstat(fd, &buf) >= 0) { 3809 mode = buf.st_mode; 3810 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3811 int n; 3812 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3813 *bytes = n; 3814 return 1; 3815 } 3816 } 3817 } 3818 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3819 return 0; 3820 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3821 return 0; 3822 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3823 return 0; 3824 } 3825 *bytes = end - cur; 3826 return 1; 3827 } 3828 3829 // Map a block of memory. 3830 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3831 char *addr, size_t bytes, bool read_only, 3832 bool allow_exec) { 3833 int prot; 3834 int flags; 3835 3836 if (read_only) { 3837 prot = PROT_READ; 3838 flags = MAP_SHARED; 3839 } else { 3840 prot = PROT_READ | PROT_WRITE; 3841 flags = MAP_PRIVATE; 3842 } 3843 3844 if (allow_exec) { 3845 prot |= PROT_EXEC; 3846 } 3847 3848 if (addr != NULL) { 3849 flags |= MAP_FIXED; 3850 } 3851 3852 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3853 fd, file_offset); 3854 if (mapped_address == MAP_FAILED) { 3855 return NULL; 3856 } 3857 return mapped_address; 3858 } 3859 3860 3861 // Remap a block of memory. 3862 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3863 char *addr, size_t bytes, bool read_only, 3864 bool allow_exec) { 3865 // same as map_memory() on this OS 3866 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3867 allow_exec); 3868 } 3869 3870 3871 // Unmap a block of memory. 3872 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3873 return munmap(addr, bytes) == 0; 3874 } 3875 3876 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3877 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3878 // of a thread. 3879 // 3880 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3881 // the fast estimate available on the platform. 3882 3883 jlong os::current_thread_cpu_time() { 3884 #ifdef __APPLE__ 3885 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3886 #else 3887 Unimplemented(); 3888 return 0; 3889 #endif 3890 } 3891 3892 jlong os::thread_cpu_time(Thread* thread) { 3893 #ifdef __APPLE__ 3894 return os::thread_cpu_time(thread, true /* user + sys */); 3895 #else 3896 Unimplemented(); 3897 return 0; 3898 #endif 3899 } 3900 3901 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3902 #ifdef __APPLE__ 3903 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3904 #else 3905 Unimplemented(); 3906 return 0; 3907 #endif 3908 } 3909 3910 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3911 #ifdef __APPLE__ 3912 struct thread_basic_info tinfo; 3913 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3914 kern_return_t kr; 3915 thread_t mach_thread; 3916 3917 mach_thread = thread->osthread()->thread_id(); 3918 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3919 if (kr != KERN_SUCCESS) { 3920 return -1; 3921 } 3922 3923 if (user_sys_cpu_time) { 3924 jlong nanos; 3925 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3926 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3927 return nanos; 3928 } else { 3929 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3930 } 3931 #else 3932 Unimplemented(); 3933 return 0; 3934 #endif 3935 } 3936 3937 3938 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3939 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3940 info_ptr->may_skip_backward = false; // elapsed time not wall time 3941 info_ptr->may_skip_forward = false; // elapsed time not wall time 3942 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3943 } 3944 3945 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3946 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3947 info_ptr->may_skip_backward = false; // elapsed time not wall time 3948 info_ptr->may_skip_forward = false; // elapsed time not wall time 3949 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3950 } 3951 3952 bool os::is_thread_cpu_time_supported() { 3953 #ifdef __APPLE__ 3954 return true; 3955 #else 3956 return false; 3957 #endif 3958 } 3959 3960 // System loadavg support. Returns -1 if load average cannot be obtained. 3961 // Bsd doesn't yet have a (official) notion of processor sets, 3962 // so just return the system wide load average. 3963 int os::loadavg(double loadavg[], int nelem) { 3964 return ::getloadavg(loadavg, nelem); 3965 } 3966 3967 void os::pause() { 3968 char filename[MAX_PATH]; 3969 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3970 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3971 } else { 3972 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3973 } 3974 3975 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3976 if (fd != -1) { 3977 struct stat buf; 3978 ::close(fd); 3979 while (::stat(filename, &buf) == 0) { 3980 (void)::poll(NULL, 0, 100); 3981 } 3982 } else { 3983 jio_fprintf(stderr, 3984 "Could not open pause file '%s', continuing immediately.\n", filename); 3985 } 3986 } 3987 3988 // Darwin has no "environ" in a dynamic library. 3989 #ifdef __APPLE__ 3990 #include <crt_externs.h> 3991 #define environ (*_NSGetEnviron()) 3992 #else 3993 extern char** environ; 3994 #endif 3995 3996 // Run the specified command in a separate process. Return its exit value, 3997 // or -1 on failure (e.g. can't fork a new process). 3998 // Unlike system(), this function can be called from signal handler. It 3999 // doesn't block SIGINT et al. 4000 int os::fork_and_exec(char* cmd) { 4001 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4002 4003 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4004 // pthread_atfork handlers and reset pthread library. All we need is a 4005 // separate process to execve. Make a direct syscall to fork process. 4006 // On IA64 there's no fork syscall, we have to use fork() and hope for 4007 // the best... 4008 pid_t pid = fork(); 4009 4010 if (pid < 0) { 4011 // fork failed 4012 return -1; 4013 4014 } else if (pid == 0) { 4015 // child process 4016 4017 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4018 // first to kill every thread on the thread list. Because this list is 4019 // not reset by fork() (see notes above), execve() will instead kill 4020 // every thread in the parent process. We know this is the only thread 4021 // in the new process, so make a system call directly. 4022 // IA64 should use normal execve() from glibc to match the glibc fork() 4023 // above. 4024 execve("/bin/sh", (char* const*)argv, environ); 4025 4026 // execve failed 4027 _exit(-1); 4028 4029 } else { 4030 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4031 // care about the actual exit code, for now. 4032 4033 int status; 4034 4035 // Wait for the child process to exit. This returns immediately if 4036 // the child has already exited. */ 4037 while (waitpid(pid, &status, 0) < 0) { 4038 switch (errno) { 4039 case ECHILD: return 0; 4040 case EINTR: break; 4041 default: return -1; 4042 } 4043 } 4044 4045 if (WIFEXITED(status)) { 4046 // The child exited normally; get its exit code. 4047 return WEXITSTATUS(status); 4048 } else if (WIFSIGNALED(status)) { 4049 // The child exited because of a signal 4050 // The best value to return is 0x80 + signal number, 4051 // because that is what all Unix shells do, and because 4052 // it allows callers to distinguish between process exit and 4053 // process death by signal. 4054 return 0x80 + WTERMSIG(status); 4055 } else { 4056 // Unknown exit code; pass it through 4057 return status; 4058 } 4059 } 4060 } 4061 4062 // is_headless_jre() 4063 // 4064 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4065 // in order to report if we are running in a headless jre 4066 // 4067 // Since JDK8 xawt/libmawt.so was moved into the same directory 4068 // as libawt.so, and renamed libawt_xawt.so 4069 // 4070 bool os::is_headless_jre() { 4071 #ifdef __APPLE__ 4072 // We no longer build headless-only on Mac OS X 4073 return false; 4074 #else 4075 struct stat statbuf; 4076 char buf[MAXPATHLEN]; 4077 char libmawtpath[MAXPATHLEN]; 4078 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4079 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4080 char *p; 4081 4082 // Get path to libjvm.so 4083 os::jvm_path(buf, sizeof(buf)); 4084 4085 // Get rid of libjvm.so 4086 p = strrchr(buf, '/'); 4087 if (p == NULL) { 4088 return false; 4089 } else { 4090 *p = '\0'; 4091 } 4092 4093 // Get rid of client or server 4094 p = strrchr(buf, '/'); 4095 if (p == NULL) { 4096 return false; 4097 } else { 4098 *p = '\0'; 4099 } 4100 4101 // check xawt/libmawt.so 4102 strcpy(libmawtpath, buf); 4103 strcat(libmawtpath, xawtstr); 4104 if (::stat(libmawtpath, &statbuf) == 0) return false; 4105 4106 // check libawt_xawt.so 4107 strcpy(libmawtpath, buf); 4108 strcat(libmawtpath, new_xawtstr); 4109 if (::stat(libmawtpath, &statbuf) == 0) return false; 4110 4111 return true; 4112 #endif 4113 } 4114 4115 // Get the default path to the core file 4116 // Returns the length of the string 4117 int os::get_core_path(char* buffer, size_t bufferSize) { 4118 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 4119 4120 // Truncate if theoretical string was longer than bufferSize 4121 n = MIN2(n, (int)bufferSize); 4122 4123 return n; 4124 } 4125 4126 #ifndef PRODUCT 4127 void TestReserveMemorySpecial_test() { 4128 // No tests available for this platform 4129 } 4130 #endif 4131 4132 bool os::start_debugging(char *buf, int buflen) { 4133 int len = (int)strlen(buf); 4134 char *p = &buf[len]; 4135 4136 jio_snprintf(p, buflen-len, 4137 "\n\n" 4138 "Do you want to debug the problem?\n\n" 4139 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 4140 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 4141 "Otherwise, press RETURN to abort...", 4142 os::current_process_id(), os::current_process_id(), 4143 os::current_thread_id(), os::current_thread_id()); 4144 4145 bool yes = os::message_box("Unexpected Error", buf); 4146 4147 if (yes) { 4148 // yes, user asked VM to launch debugger 4149 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 4150 os::current_process_id(), os::current_process_id()); 4151 4152 os::fork_and_exec(buf); 4153 yes = false; 4154 } 4155 return yes; 4156 }