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/decoder.hpp" 67 #include "utilities/defaultStream.hpp" 68 #include "utilities/events.hpp" 69 #include "utilities/growableArray.hpp" 70 #include "utilities/vmError.hpp" 71 72 // put OS-includes here 73 # include <sys/types.h> 74 # include <sys/mman.h> 75 # include <sys/stat.h> 76 # include <sys/select.h> 77 # include <pthread.h> 78 # include <signal.h> 79 # include <errno.h> 80 # include <dlfcn.h> 81 # include <stdio.h> 82 # include <unistd.h> 83 # include <sys/resource.h> 84 # include <pthread.h> 85 # include <sys/stat.h> 86 # include <sys/time.h> 87 # include <sys/times.h> 88 # include <sys/utsname.h> 89 # include <sys/socket.h> 90 # include <sys/wait.h> 91 # include <time.h> 92 # include <pwd.h> 93 # include <poll.h> 94 # include <semaphore.h> 95 # include <fcntl.h> 96 # include <string.h> 97 # include <sys/param.h> 98 # include <sys/sysctl.h> 99 # include <sys/ipc.h> 100 # include <sys/shm.h> 101 #ifndef __APPLE__ 102 # include <link.h> 103 #endif 104 # include <stdint.h> 105 # include <inttypes.h> 106 # include <sys/ioctl.h> 107 # include <sys/syscall.h> 108 109 #if defined(__FreeBSD__) || defined(__NetBSD__) 110 #include <elf.h> 111 #endif 112 113 #ifdef __APPLE__ 114 #include <mach/mach.h> // semaphore_* API 115 #include <mach-o/dyld.h> 116 #include <sys/proc_info.h> 117 #include <objc/objc-auto.h> 118 #endif 119 120 #ifndef MAP_ANONYMOUS 121 #define MAP_ANONYMOUS MAP_ANON 122 #endif 123 124 #define MAX_PATH (2 * K) 125 126 // for timer info max values which include all bits 127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 128 129 #define LARGEPAGES_BIT (1 << 6) 130 131 //////////////////////////////////////////////////////////////////////////////// 132 // global variables 133 julong os::Bsd::_physical_memory = 0; 134 135 #ifdef __APPLE__ 136 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; 137 volatile uint64_t os::Bsd::_max_abstime = 0; 138 #else 139 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 140 #endif 141 pthread_t os::Bsd::_main_thread; 142 int os::Bsd::_page_size = -1; 143 144 static jlong initial_time_count=0; 145 146 static int clock_tics_per_sec = 100; 147 148 // For diagnostics to print a message once. see run_periodic_checks 149 static sigset_t check_signal_done; 150 static bool check_signals = true; 151 152 static pid_t _initial_pid = 0; 153 154 // Signal number used to suspend/resume a thread 155 156 // do not use any signal number less than SIGSEGV, see 4355769 157 static int SR_signum = SIGUSR2; 158 sigset_t SR_sigset; 159 160 161 //////////////////////////////////////////////////////////////////////////////// 162 // utility functions 163 164 static int SR_initialize(); 165 166 julong os::available_memory() { 167 return Bsd::available_memory(); 168 } 169 170 // available here means free 171 julong os::Bsd::available_memory() { 172 uint64_t available = physical_memory() >> 2; 173 #ifdef __APPLE__ 174 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; 175 vm_statistics64_data_t vmstat; 176 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, 177 (host_info64_t)&vmstat, &count); 178 assert(kerr == KERN_SUCCESS, 179 "host_statistics64 failed - check mach_host_self() and count"); 180 if (kerr == KERN_SUCCESS) { 181 available = vmstat.free_count * os::vm_page_size(); 182 } 183 #endif 184 return available; 185 } 186 187 julong os::physical_memory() { 188 return Bsd::physical_memory(); 189 } 190 191 // Return true if user is running as root. 192 193 bool os::have_special_privileges() { 194 static bool init = false; 195 static bool privileges = false; 196 if (!init) { 197 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 198 init = true; 199 } 200 return privileges; 201 } 202 203 204 205 // Cpu architecture string 206 #if defined(ZERO) 207 static char cpu_arch[] = ZERO_LIBARCH; 208 #elif defined(IA64) 209 static char cpu_arch[] = "ia64"; 210 #elif defined(IA32) 211 static char cpu_arch[] = "i386"; 212 #elif defined(AMD64) 213 static char cpu_arch[] = "amd64"; 214 #elif defined(ARM) 215 static char cpu_arch[] = "arm"; 216 #elif defined(PPC32) 217 static char cpu_arch[] = "ppc"; 218 #elif defined(SPARC) 219 #ifdef _LP64 220 static char cpu_arch[] = "sparcv9"; 221 #else 222 static char cpu_arch[] = "sparc"; 223 #endif 224 #else 225 #error Add appropriate cpu_arch setting 226 #endif 227 228 // Compiler variant 229 #ifdef COMPILER2 230 #define COMPILER_VARIANT "server" 231 #else 232 #define COMPILER_VARIANT "client" 233 #endif 234 235 236 void os::Bsd::initialize_system_info() { 237 int mib[2]; 238 size_t len; 239 int cpu_val; 240 julong mem_val; 241 242 // get processors count via hw.ncpus sysctl 243 mib[0] = CTL_HW; 244 mib[1] = HW_NCPU; 245 len = sizeof(cpu_val); 246 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 247 assert(len == sizeof(cpu_val), "unexpected data size"); 248 set_processor_count(cpu_val); 249 } else { 250 set_processor_count(1); // fallback 251 } 252 253 // get physical memory via hw.memsize sysctl (hw.memsize is used 254 // since it returns a 64 bit value) 255 mib[0] = CTL_HW; 256 257 #if defined (HW_MEMSIZE) // Apple 258 mib[1] = HW_MEMSIZE; 259 #elif defined(HW_PHYSMEM) // Most of BSD 260 mib[1] = HW_PHYSMEM; 261 #elif defined(HW_REALMEM) // Old FreeBSD 262 mib[1] = HW_REALMEM; 263 #else 264 #error No ways to get physmem 265 #endif 266 267 len = sizeof(mem_val); 268 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 269 assert(len == sizeof(mem_val), "unexpected data size"); 270 _physical_memory = mem_val; 271 } else { 272 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?) 273 } 274 275 #ifdef __OpenBSD__ 276 { 277 // limit _physical_memory memory view on OpenBSD since 278 // datasize rlimit restricts us anyway. 279 struct rlimit limits; 280 getrlimit(RLIMIT_DATA, &limits); 281 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 282 } 283 #endif 284 } 285 286 #ifdef __APPLE__ 287 static const char *get_home() { 288 const char *home_dir = ::getenv("HOME"); 289 if ((home_dir == NULL) || (*home_dir == '\0')) { 290 struct passwd *passwd_info = getpwuid(geteuid()); 291 if (passwd_info != NULL) { 292 home_dir = passwd_info->pw_dir; 293 } 294 } 295 296 return home_dir; 297 } 298 #endif 299 300 void os::init_system_properties_values() { 301 // The next steps are taken in the product version: 302 // 303 // Obtain the JAVA_HOME value from the location of libjvm.so. 304 // This library should be located at: 305 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 306 // 307 // If "/jre/lib/" appears at the right place in the path, then we 308 // assume libjvm.so is installed in a JDK and we use this path. 309 // 310 // Otherwise exit with message: "Could not create the Java virtual machine." 311 // 312 // The following extra steps are taken in the debugging version: 313 // 314 // If "/jre/lib/" does NOT appear at the right place in the path 315 // instead of exit check for $JAVA_HOME environment variable. 316 // 317 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 318 // then we append a fake suffix "hotspot/libjvm.so" to this path so 319 // it looks like libjvm.so is installed there 320 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 321 // 322 // Otherwise exit. 323 // 324 // Important note: if the location of libjvm.so changes this 325 // code needs to be changed accordingly. 326 327 // See ld(1): 328 // The linker uses the following search paths to locate required 329 // shared libraries: 330 // 1: ... 331 // ... 332 // 7: The default directories, normally /lib and /usr/lib. 333 #ifndef DEFAULT_LIBPATH 334 #define DEFAULT_LIBPATH "/lib:/usr/lib" 335 #endif 336 337 // Base path of extensions installed on the system. 338 #define SYS_EXT_DIR "/usr/java/packages" 339 #define EXTENSIONS_DIR "/lib/ext" 340 341 #ifndef __APPLE__ 342 343 // Buffer that fits several sprintfs. 344 // Note that the space for the colon and the trailing null are provided 345 // by the nulls included by the sizeof operator. 346 const size_t bufsize = 347 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 348 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 349 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 350 351 // sysclasspath, java_home, dll_dir 352 { 353 char *pslash; 354 os::jvm_path(buf, bufsize); 355 356 // Found the full path to libjvm.so. 357 // Now cut the path to <java_home>/jre if we can. 358 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 359 pslash = strrchr(buf, '/'); 360 if (pslash != NULL) { 361 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 362 } 363 Arguments::set_dll_dir(buf); 364 365 if (pslash != NULL) { 366 pslash = strrchr(buf, '/'); 367 if (pslash != NULL) { 368 *pslash = '\0'; // Get rid of /<arch>. 369 pslash = strrchr(buf, '/'); 370 if (pslash != NULL) { 371 *pslash = '\0'; // Get rid of /lib. 372 } 373 } 374 } 375 Arguments::set_java_home(buf); 376 set_boot_path('/', ':'); 377 } 378 379 // Where to look for native libraries. 380 // 381 // Note: Due to a legacy implementation, most of the library path 382 // is set in the launcher. This was to accomodate linking restrictions 383 // on legacy Bsd implementations (which are no longer supported). 384 // Eventually, all the library path setting will be done here. 385 // 386 // However, to prevent the proliferation of improperly built native 387 // libraries, the new path component /usr/java/packages is added here. 388 // Eventually, all the library path setting will be done here. 389 { 390 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 391 // should always exist (until the legacy problem cited above is 392 // addressed). 393 const char *v = ::getenv("LD_LIBRARY_PATH"); 394 const char *v_colon = ":"; 395 if (v == NULL) { v = ""; v_colon = ""; } 396 // That's +1 for the colon and +1 for the trailing '\0'. 397 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 398 strlen(v) + 1 + 399 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, 400 mtInternal); 401 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); 402 Arguments::set_library_path(ld_library_path); 403 FREE_C_HEAP_ARRAY(char, ld_library_path); 404 } 405 406 // Extensions directories. 407 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 408 Arguments::set_ext_dirs(buf); 409 410 FREE_C_HEAP_ARRAY(char, buf); 411 412 #else // __APPLE__ 413 414 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 415 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 416 417 const char *user_home_dir = get_home(); 418 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. 419 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 420 sizeof(SYS_EXTENSIONS_DIRS); 421 422 // Buffer that fits several sprintfs. 423 // Note that the space for the colon and the trailing null are provided 424 // by the nulls included by the sizeof operator. 425 const size_t bufsize = 426 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends. 427 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir 428 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 429 430 // sysclasspath, java_home, dll_dir 431 { 432 char *pslash; 433 os::jvm_path(buf, bufsize); 434 435 // Found the full path to libjvm.so. 436 // Now cut the path to <java_home>/jre if we can. 437 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 438 pslash = strrchr(buf, '/'); 439 if (pslash != NULL) { 440 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 441 } 442 #ifdef STATIC_BUILD 443 strcat(buf, "/lib"); 444 #endif 445 446 Arguments::set_dll_dir(buf); 447 448 if (pslash != NULL) { 449 pslash = strrchr(buf, '/'); 450 if (pslash != NULL) { 451 *pslash = '\0'; // Get rid of /lib. 452 } 453 } 454 Arguments::set_java_home(buf); 455 set_boot_path('/', ':'); 456 } 457 458 // Where to look for native libraries. 459 // 460 // Note: Due to a legacy implementation, most of the library path 461 // is set in the launcher. This was to accomodate linking restrictions 462 // on legacy Bsd implementations (which are no longer supported). 463 // Eventually, all the library path setting will be done here. 464 // 465 // However, to prevent the proliferation of improperly built native 466 // libraries, the new path component /usr/java/packages is added here. 467 // Eventually, all the library path setting will be done here. 468 { 469 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 470 // should always exist (until the legacy problem cited above is 471 // addressed). 472 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code 473 // can specify a directory inside an app wrapper 474 const char *l = ::getenv("JAVA_LIBRARY_PATH"); 475 const char *l_colon = ":"; 476 if (l == NULL) { l = ""; l_colon = ""; } 477 478 const char *v = ::getenv("DYLD_LIBRARY_PATH"); 479 const char *v_colon = ":"; 480 if (v == NULL) { v = ""; v_colon = ""; } 481 482 // Apple's Java6 has "." at the beginning of java.library.path. 483 // OpenJDK on Windows has "." at the end of java.library.path. 484 // OpenJDK on Linux and Solaris don't have "." in java.library.path 485 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 486 // "." is appended to the end of java.library.path. Yes, this 487 // could cause a change in behavior, but Apple's Java6 behavior 488 // can be achieved by putting "." at the beginning of the 489 // JAVA_LIBRARY_PATH environment variable. 490 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 491 strlen(v) + 1 + strlen(l) + 1 + 492 system_ext_size + 3, 493 mtInternal); 494 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", 495 v, v_colon, l, l_colon, user_home_dir); 496 Arguments::set_library_path(ld_library_path); 497 FREE_C_HEAP_ARRAY(char, ld_library_path); 498 } 499 500 // Extensions directories. 501 // 502 // Note that the space for the colon and the trailing null are provided 503 // by the nulls included by the sizeof operator (so actually one byte more 504 // than necessary is allocated). 505 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, 506 user_home_dir, Arguments::get_java_home()); 507 Arguments::set_ext_dirs(buf); 508 509 FREE_C_HEAP_ARRAY(char, buf); 510 511 #undef SYS_EXTENSIONS_DIR 512 #undef SYS_EXTENSIONS_DIRS 513 514 #endif // __APPLE__ 515 516 #undef SYS_EXT_DIR 517 #undef EXTENSIONS_DIR 518 } 519 520 //////////////////////////////////////////////////////////////////////////////// 521 // breakpoint support 522 523 void os::breakpoint() { 524 BREAKPOINT; 525 } 526 527 extern "C" void breakpoint() { 528 // use debugger to set breakpoint here 529 } 530 531 //////////////////////////////////////////////////////////////////////////////// 532 // signal support 533 534 debug_only(static bool signal_sets_initialized = false); 535 static sigset_t unblocked_sigs, vm_sigs; 536 537 bool os::Bsd::is_sig_ignored(int sig) { 538 struct sigaction oact; 539 sigaction(sig, (struct sigaction*)NULL, &oact); 540 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 541 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 542 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 543 return true; 544 } else { 545 return false; 546 } 547 } 548 549 void os::Bsd::signal_sets_init() { 550 // Should also have an assertion stating we are still single-threaded. 551 assert(!signal_sets_initialized, "Already initialized"); 552 // Fill in signals that are necessarily unblocked for all threads in 553 // the VM. Currently, we unblock the following signals: 554 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 555 // by -Xrs (=ReduceSignalUsage)); 556 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 557 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 558 // the dispositions or masks wrt these signals. 559 // Programs embedding the VM that want to use the above signals for their 560 // own purposes must, at this time, use the "-Xrs" option to prevent 561 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 562 // (See bug 4345157, and other related bugs). 563 // In reality, though, unblocking these signals is really a nop, since 564 // these signals are not blocked by default. 565 sigemptyset(&unblocked_sigs); 566 sigaddset(&unblocked_sigs, SIGILL); 567 sigaddset(&unblocked_sigs, SIGSEGV); 568 sigaddset(&unblocked_sigs, SIGBUS); 569 sigaddset(&unblocked_sigs, SIGFPE); 570 sigaddset(&unblocked_sigs, SR_signum); 571 572 if (!ReduceSignalUsage) { 573 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 574 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 575 576 } 577 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 578 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 579 } 580 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 581 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 582 } 583 } 584 // Fill in signals that are blocked by all but the VM thread. 585 sigemptyset(&vm_sigs); 586 if (!ReduceSignalUsage) { 587 sigaddset(&vm_sigs, BREAK_SIGNAL); 588 } 589 debug_only(signal_sets_initialized = true); 590 591 } 592 593 // These are signals that are unblocked while a thread is running Java. 594 // (For some reason, they get blocked by default.) 595 sigset_t* os::Bsd::unblocked_signals() { 596 assert(signal_sets_initialized, "Not initialized"); 597 return &unblocked_sigs; 598 } 599 600 // These are the signals that are blocked while a (non-VM) thread is 601 // running Java. Only the VM thread handles these signals. 602 sigset_t* os::Bsd::vm_signals() { 603 assert(signal_sets_initialized, "Not initialized"); 604 return &vm_sigs; 605 } 606 607 void os::Bsd::hotspot_sigmask(Thread* thread) { 608 609 //Save caller's signal mask before setting VM signal mask 610 sigset_t caller_sigmask; 611 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 612 613 OSThread* osthread = thread->osthread(); 614 osthread->set_caller_sigmask(caller_sigmask); 615 616 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 617 618 if (!ReduceSignalUsage) { 619 if (thread->is_VM_thread()) { 620 // Only the VM thread handles BREAK_SIGNAL ... 621 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 622 } else { 623 // ... all other threads block BREAK_SIGNAL 624 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 625 } 626 } 627 } 628 629 630 ////////////////////////////////////////////////////////////////////////////// 631 // create new thread 632 633 #ifdef __APPLE__ 634 // library handle for calling objc_registerThreadWithCollector() 635 // without static linking to the libobjc library 636 #define OBJC_LIB "/usr/lib/libobjc.dylib" 637 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 638 typedef void (*objc_registerThreadWithCollector_t)(); 639 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 640 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 641 #endif 642 643 #ifdef __APPLE__ 644 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 645 // Additional thread_id used to correlate threads in SA 646 thread_identifier_info_data_t m_ident_info; 647 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 648 649 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 650 (thread_info_t) &m_ident_info, &count); 651 652 return m_ident_info.thread_id; 653 } 654 #endif 655 656 // Thread start routine for all newly created threads 657 static void *thread_native_entry(Thread *thread) { 658 // Try to randomize the cache line index of hot stack frames. 659 // This helps when threads of the same stack traces evict each other's 660 // cache lines. The threads can be either from the same JVM instance, or 661 // from different JVM instances. The benefit is especially true for 662 // processors with hyperthreading technology. 663 static int counter = 0; 664 int pid = os::current_process_id(); 665 alloca(((pid ^ counter++) & 7) * 128); 666 667 thread->initialize_thread_current(); 668 669 OSThread* osthread = thread->osthread(); 670 Monitor* sync = osthread->startThread_lock(); 671 672 osthread->set_thread_id(os::Bsd::gettid()); 673 674 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 675 os::current_thread_id(), (uintx) pthread_self()); 676 677 #ifdef __APPLE__ 678 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 679 guarantee(unique_thread_id != 0, "unique thread id was not found"); 680 osthread->set_unique_thread_id(unique_thread_id); 681 #endif 682 // initialize signal mask for this thread 683 os::Bsd::hotspot_sigmask(thread); 684 685 // initialize floating point control register 686 os::Bsd::init_thread_fpu_state(); 687 688 #ifdef __APPLE__ 689 // register thread with objc gc 690 if (objc_registerThreadWithCollectorFunction != NULL) { 691 objc_registerThreadWithCollectorFunction(); 692 } 693 #endif 694 695 // handshaking with parent thread 696 { 697 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 698 699 // notify parent thread 700 osthread->set_state(INITIALIZED); 701 sync->notify_all(); 702 703 // wait until os::start_thread() 704 while (osthread->get_state() == INITIALIZED) { 705 sync->wait(Mutex::_no_safepoint_check_flag); 706 } 707 } 708 709 // call one more level start routine 710 thread->run(); 711 712 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 713 os::current_thread_id(), (uintx) pthread_self()); 714 715 // If a thread has not deleted itself ("delete this") as part of its 716 // termination sequence, we have to ensure thread-local-storage is 717 // cleared before we actually terminate. No threads should ever be 718 // deleted asynchronously with respect to their termination. 719 if (Thread::current_or_null_safe() != NULL) { 720 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 721 thread->clear_thread_current(); 722 } 723 724 return 0; 725 } 726 727 bool os::create_thread(Thread* thread, ThreadType thr_type, 728 size_t req_stack_size) { 729 assert(thread->osthread() == NULL, "caller responsible"); 730 731 // Allocate the OSThread object 732 OSThread* osthread = new OSThread(NULL, NULL); 733 if (osthread == NULL) { 734 return false; 735 } 736 737 // set the correct thread state 738 osthread->set_thread_type(thr_type); 739 740 // Initial state is ALLOCATED but not INITIALIZED 741 osthread->set_state(ALLOCATED); 742 743 thread->set_osthread(osthread); 744 745 // init thread attributes 746 pthread_attr_t attr; 747 pthread_attr_init(&attr); 748 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 749 750 // calculate stack size if it's not specified by caller 751 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 752 int status = pthread_attr_setstacksize(&attr, stack_size); 753 assert_status(status == 0, status, "pthread_attr_setstacksize"); 754 755 ThreadState state; 756 757 { 758 pthread_t tid; 759 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 760 761 char buf[64]; 762 if (ret == 0) { 763 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 764 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 765 } else { 766 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 767 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 768 } 769 770 pthread_attr_destroy(&attr); 771 772 if (ret != 0) { 773 // Need to clean up stuff we've allocated so far 774 thread->set_osthread(NULL); 775 delete osthread; 776 return false; 777 } 778 779 // Store pthread info into the OSThread 780 osthread->set_pthread_id(tid); 781 782 // Wait until child thread is either initialized or aborted 783 { 784 Monitor* sync_with_child = osthread->startThread_lock(); 785 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 786 while ((state = osthread->get_state()) == ALLOCATED) { 787 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 788 } 789 } 790 791 } 792 793 // Aborted due to thread limit being reached 794 if (state == ZOMBIE) { 795 thread->set_osthread(NULL); 796 delete osthread; 797 return false; 798 } 799 800 // The thread is returned suspended (in state INITIALIZED), 801 // and is started higher up in the call chain 802 assert(state == INITIALIZED, "race condition"); 803 return true; 804 } 805 806 ///////////////////////////////////////////////////////////////////////////// 807 // attach existing thread 808 809 // bootstrap the main thread 810 bool os::create_main_thread(JavaThread* thread) { 811 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 812 return create_attached_thread(thread); 813 } 814 815 bool os::create_attached_thread(JavaThread* thread) { 816 #ifdef ASSERT 817 thread->verify_not_published(); 818 #endif 819 820 // Allocate the OSThread object 821 OSThread* osthread = new OSThread(NULL, NULL); 822 823 if (osthread == NULL) { 824 return false; 825 } 826 827 osthread->set_thread_id(os::Bsd::gettid()); 828 829 // Store pthread info into the OSThread 830 #ifdef __APPLE__ 831 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 832 guarantee(unique_thread_id != 0, "just checking"); 833 osthread->set_unique_thread_id(unique_thread_id); 834 #endif 835 osthread->set_pthread_id(::pthread_self()); 836 837 // initialize floating point control register 838 os::Bsd::init_thread_fpu_state(); 839 840 // Initial thread state is RUNNABLE 841 osthread->set_state(RUNNABLE); 842 843 thread->set_osthread(osthread); 844 845 // initialize signal mask for this thread 846 // and save the caller's signal mask 847 os::Bsd::hotspot_sigmask(thread); 848 849 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 850 os::current_thread_id(), (uintx) pthread_self()); 851 852 return true; 853 } 854 855 void os::pd_start_thread(Thread* thread) { 856 OSThread * osthread = thread->osthread(); 857 assert(osthread->get_state() != INITIALIZED, "just checking"); 858 Monitor* sync_with_child = osthread->startThread_lock(); 859 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 860 sync_with_child->notify(); 861 } 862 863 // Free Bsd resources related to the OSThread 864 void os::free_thread(OSThread* osthread) { 865 assert(osthread != NULL, "osthread not set"); 866 867 // We are told to free resources of the argument thread, 868 // but we can only really operate on the current thread. 869 assert(Thread::current()->osthread() == osthread, 870 "os::free_thread but not current thread"); 871 872 // Restore caller's signal mask 873 sigset_t sigmask = osthread->caller_sigmask(); 874 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 875 876 delete osthread; 877 } 878 879 //////////////////////////////////////////////////////////////////////////////// 880 // time support 881 882 // Time since start-up in seconds to a fine granularity. 883 // Used by VMSelfDestructTimer and the MemProfiler. 884 double os::elapsedTime() { 885 886 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 887 } 888 889 jlong os::elapsed_counter() { 890 return javaTimeNanos() - initial_time_count; 891 } 892 893 jlong os::elapsed_frequency() { 894 return NANOSECS_PER_SEC; // nanosecond resolution 895 } 896 897 bool os::supports_vtime() { return true; } 898 bool os::enable_vtime() { return false; } 899 bool os::vtime_enabled() { return false; } 900 901 double os::elapsedVTime() { 902 // better than nothing, but not much 903 return elapsedTime(); 904 } 905 906 jlong os::javaTimeMillis() { 907 timeval time; 908 int status = gettimeofday(&time, NULL); 909 assert(status != -1, "bsd error"); 910 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 911 } 912 913 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 914 timeval time; 915 int status = gettimeofday(&time, NULL); 916 assert(status != -1, "bsd error"); 917 seconds = jlong(time.tv_sec); 918 nanos = jlong(time.tv_usec) * 1000; 919 } 920 921 #ifndef __APPLE__ 922 #ifndef CLOCK_MONOTONIC 923 #define CLOCK_MONOTONIC (1) 924 #endif 925 #endif 926 927 #ifdef __APPLE__ 928 void os::Bsd::clock_init() { 929 mach_timebase_info(&_timebase_info); 930 } 931 #else 932 void os::Bsd::clock_init() { 933 struct timespec res; 934 struct timespec tp; 935 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 936 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 937 // yes, monotonic clock is supported 938 _clock_gettime = ::clock_gettime; 939 } 940 } 941 #endif 942 943 944 945 #ifdef __APPLE__ 946 947 jlong os::javaTimeNanos() { 948 const uint64_t tm = mach_absolute_time(); 949 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 950 const uint64_t prev = Bsd::_max_abstime; 951 if (now <= prev) { 952 return prev; // same or retrograde time; 953 } 954 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev); 955 assert(obsv >= prev, "invariant"); // Monotonicity 956 // If the CAS succeeded then we're done and return "now". 957 // If the CAS failed and the observed value "obsv" is >= now then 958 // we should return "obsv". If the CAS failed and now > obsv > prv then 959 // some other thread raced this thread and installed a new value, in which case 960 // we could either (a) retry the entire operation, (b) retry trying to install now 961 // or (c) just return obsv. We use (c). No loop is required although in some cases 962 // we might discard a higher "now" value in deference to a slightly lower but freshly 963 // installed obsv value. That's entirely benign -- it admits no new orderings compared 964 // to (a) or (b) -- and greatly reduces coherence traffic. 965 // We might also condition (c) on the magnitude of the delta between obsv and now. 966 // Avoiding excessive CAS operations to hot RW locations is critical. 967 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 968 return (prev == obsv) ? now : obsv; 969 } 970 971 #else // __APPLE__ 972 973 jlong os::javaTimeNanos() { 974 if (os::supports_monotonic_clock()) { 975 struct timespec tp; 976 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 977 assert(status == 0, "gettime error"); 978 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 979 return result; 980 } else { 981 timeval time; 982 int status = gettimeofday(&time, NULL); 983 assert(status != -1, "bsd error"); 984 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 985 return 1000 * usecs; 986 } 987 } 988 989 #endif // __APPLE__ 990 991 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 992 if (os::supports_monotonic_clock()) { 993 info_ptr->max_value = ALL_64_BITS; 994 995 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 996 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 997 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 998 } else { 999 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1000 info_ptr->max_value = ALL_64_BITS; 1001 1002 // gettimeofday is a real time clock so it skips 1003 info_ptr->may_skip_backward = true; 1004 info_ptr->may_skip_forward = true; 1005 } 1006 1007 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1008 } 1009 1010 // Return the real, user, and system times in seconds from an 1011 // arbitrary fixed point in the past. 1012 bool os::getTimesSecs(double* process_real_time, 1013 double* process_user_time, 1014 double* process_system_time) { 1015 struct tms ticks; 1016 clock_t real_ticks = times(&ticks); 1017 1018 if (real_ticks == (clock_t) (-1)) { 1019 return false; 1020 } else { 1021 double ticks_per_second = (double) clock_tics_per_sec; 1022 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1023 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1024 *process_real_time = ((double) real_ticks) / ticks_per_second; 1025 1026 return true; 1027 } 1028 } 1029 1030 1031 char * os::local_time_string(char *buf, size_t buflen) { 1032 struct tm t; 1033 time_t long_time; 1034 time(&long_time); 1035 localtime_r(&long_time, &t); 1036 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1037 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1038 t.tm_hour, t.tm_min, t.tm_sec); 1039 return buf; 1040 } 1041 1042 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1043 return localtime_r(clock, res); 1044 } 1045 1046 //////////////////////////////////////////////////////////////////////////////// 1047 // runtime exit support 1048 1049 // Note: os::shutdown() might be called very early during initialization, or 1050 // called from signal handler. Before adding something to os::shutdown(), make 1051 // sure it is async-safe and can handle partially initialized VM. 1052 void os::shutdown() { 1053 1054 // allow PerfMemory to attempt cleanup of any persistent resources 1055 perfMemory_exit(); 1056 1057 // needs to remove object in file system 1058 AttachListener::abort(); 1059 1060 // flush buffered output, finish log files 1061 ostream_abort(); 1062 1063 // Check for abort hook 1064 abort_hook_t abort_hook = Arguments::abort_hook(); 1065 if (abort_hook != NULL) { 1066 abort_hook(); 1067 } 1068 1069 } 1070 1071 // Note: os::abort() might be called very early during initialization, or 1072 // called from signal handler. Before adding something to os::abort(), make 1073 // sure it is async-safe and can handle partially initialized VM. 1074 void os::abort(bool dump_core, void* siginfo, const void* context) { 1075 os::shutdown(); 1076 if (dump_core) { 1077 #ifndef PRODUCT 1078 fdStream out(defaultStream::output_fd()); 1079 out.print_raw("Current thread is "); 1080 char buf[16]; 1081 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1082 out.print_raw_cr(buf); 1083 out.print_raw_cr("Dumping core ..."); 1084 #endif 1085 ::abort(); // dump core 1086 } 1087 1088 ::exit(1); 1089 } 1090 1091 // Die immediately, no exit hook, no abort hook, no cleanup. 1092 void os::die() { 1093 // _exit() on BsdThreads only kills current thread 1094 ::abort(); 1095 } 1096 1097 // This method is a copy of JDK's sysGetLastErrorString 1098 // from src/solaris/hpi/src/system_md.c 1099 1100 size_t os::lasterror(char *buf, size_t len) { 1101 if (errno == 0) return 0; 1102 1103 const char *s = os::strerror(errno); 1104 size_t n = ::strlen(s); 1105 if (n >= len) { 1106 n = len - 1; 1107 } 1108 ::strncpy(buf, s, n); 1109 buf[n] = '\0'; 1110 return n; 1111 } 1112 1113 // Information of current thread in variety of formats 1114 pid_t os::Bsd::gettid() { 1115 int retval = -1; 1116 1117 #ifdef __APPLE__ //XNU kernel 1118 // despite the fact mach port is actually not a thread id use it 1119 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1120 retval = ::pthread_mach_thread_np(::pthread_self()); 1121 guarantee(retval != 0, "just checking"); 1122 return retval; 1123 1124 #else 1125 #ifdef __FreeBSD__ 1126 retval = syscall(SYS_thr_self); 1127 #else 1128 #ifdef __OpenBSD__ 1129 retval = syscall(SYS_getthrid); 1130 #else 1131 #ifdef __NetBSD__ 1132 retval = (pid_t) syscall(SYS__lwp_self); 1133 #endif 1134 #endif 1135 #endif 1136 #endif 1137 1138 if (retval == -1) { 1139 return getpid(); 1140 } 1141 } 1142 1143 intx os::current_thread_id() { 1144 #ifdef __APPLE__ 1145 return (intx)::pthread_mach_thread_np(::pthread_self()); 1146 #else 1147 return (intx)::pthread_self(); 1148 #endif 1149 } 1150 1151 int os::current_process_id() { 1152 1153 // Under the old bsd thread library, bsd gives each thread 1154 // its own process id. Because of this each thread will return 1155 // a different pid if this method were to return the result 1156 // of getpid(2). Bsd provides no api that returns the pid 1157 // of the launcher thread for the vm. This implementation 1158 // returns a unique pid, the pid of the launcher thread 1159 // that starts the vm 'process'. 1160 1161 // Under the NPTL, getpid() returns the same pid as the 1162 // launcher thread rather than a unique pid per thread. 1163 // Use gettid() if you want the old pre NPTL behaviour. 1164 1165 // if you are looking for the result of a call to getpid() that 1166 // returns a unique pid for the calling thread, then look at the 1167 // OSThread::thread_id() method in osThread_bsd.hpp file 1168 1169 return (int)(_initial_pid ? _initial_pid : getpid()); 1170 } 1171 1172 // DLL functions 1173 1174 #define JNI_LIB_PREFIX "lib" 1175 #ifdef __APPLE__ 1176 #define JNI_LIB_SUFFIX ".dylib" 1177 #else 1178 #define JNI_LIB_SUFFIX ".so" 1179 #endif 1180 1181 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1182 1183 // This must be hard coded because it's the system's temporary 1184 // directory not the java application's temp directory, ala java.io.tmpdir. 1185 #ifdef __APPLE__ 1186 // macosx has a secure per-user temporary directory 1187 char temp_path_storage[PATH_MAX]; 1188 const char* os::get_temp_directory() { 1189 static char *temp_path = NULL; 1190 if (temp_path == NULL) { 1191 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1192 if (pathSize == 0 || pathSize > PATH_MAX) { 1193 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1194 } 1195 temp_path = temp_path_storage; 1196 } 1197 return temp_path; 1198 } 1199 #else // __APPLE__ 1200 const char* os::get_temp_directory() { return "/tmp"; } 1201 #endif // __APPLE__ 1202 1203 static bool file_exists(const char* filename) { 1204 struct stat statbuf; 1205 if (filename == NULL || strlen(filename) == 0) { 1206 return false; 1207 } 1208 return os::stat(filename, &statbuf) == 0; 1209 } 1210 1211 bool os::dll_build_name(char* buffer, size_t buflen, 1212 const char* pname, const char* fname) { 1213 bool retval = false; 1214 // Copied from libhpi 1215 const size_t pnamelen = pname ? strlen(pname) : 0; 1216 1217 // Return error on buffer overflow. 1218 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1219 return retval; 1220 } 1221 1222 if (pnamelen == 0) { 1223 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1224 retval = true; 1225 } else if (strchr(pname, *os::path_separator()) != NULL) { 1226 int n; 1227 char** pelements = split_path(pname, &n); 1228 if (pelements == NULL) { 1229 return false; 1230 } 1231 for (int i = 0; i < n; i++) { 1232 // Really shouldn't be NULL, but check can't hurt 1233 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1234 continue; // skip the empty path values 1235 } 1236 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1237 pelements[i], fname); 1238 if (file_exists(buffer)) { 1239 retval = true; 1240 break; 1241 } 1242 } 1243 // release the storage 1244 for (int i = 0; i < n; i++) { 1245 if (pelements[i] != NULL) { 1246 FREE_C_HEAP_ARRAY(char, pelements[i]); 1247 } 1248 } 1249 if (pelements != NULL) { 1250 FREE_C_HEAP_ARRAY(char*, pelements); 1251 } 1252 } else { 1253 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1254 retval = true; 1255 } 1256 return retval; 1257 } 1258 1259 // check if addr is inside libjvm.so 1260 bool os::address_is_in_vm(address addr) { 1261 static address libjvm_base_addr; 1262 Dl_info dlinfo; 1263 1264 if (libjvm_base_addr == NULL) { 1265 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1266 libjvm_base_addr = (address)dlinfo.dli_fbase; 1267 } 1268 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1269 } 1270 1271 if (dladdr((void *)addr, &dlinfo) != 0) { 1272 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1273 } 1274 1275 return false; 1276 } 1277 1278 1279 #define MACH_MAXSYMLEN 256 1280 1281 bool os::dll_address_to_function_name(address addr, char *buf, 1282 int buflen, int *offset, 1283 bool demangle) { 1284 // buf is not optional, but offset is optional 1285 assert(buf != NULL, "sanity check"); 1286 1287 Dl_info dlinfo; 1288 char localbuf[MACH_MAXSYMLEN]; 1289 1290 if (dladdr((void*)addr, &dlinfo) != 0) { 1291 // see if we have a matching symbol 1292 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1293 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1294 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1295 } 1296 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1297 return true; 1298 } 1299 // no matching symbol so try for just file info 1300 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1301 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1302 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1303 return true; 1304 } 1305 } 1306 1307 // Handle non-dynamic manually: 1308 if (dlinfo.dli_fbase != NULL && 1309 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1310 dlinfo.dli_fbase)) { 1311 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1312 jio_snprintf(buf, buflen, "%s", localbuf); 1313 } 1314 return true; 1315 } 1316 } 1317 buf[0] = '\0'; 1318 if (offset != NULL) *offset = -1; 1319 return false; 1320 } 1321 1322 // ported from solaris version 1323 bool os::dll_address_to_library_name(address addr, char* buf, 1324 int buflen, int* offset) { 1325 // buf is not optional, but offset is optional 1326 assert(buf != NULL, "sanity check"); 1327 1328 Dl_info dlinfo; 1329 1330 if (dladdr((void*)addr, &dlinfo) != 0) { 1331 if (dlinfo.dli_fname != NULL) { 1332 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1333 } 1334 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1335 *offset = addr - (address)dlinfo.dli_fbase; 1336 } 1337 return true; 1338 } 1339 1340 buf[0] = '\0'; 1341 if (offset) *offset = -1; 1342 return false; 1343 } 1344 1345 // Loads .dll/.so and 1346 // in case of error it checks if .dll/.so was built for the 1347 // same architecture as Hotspot is running on 1348 1349 #ifdef __APPLE__ 1350 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1351 #ifdef STATIC_BUILD 1352 return os::get_default_process_handle(); 1353 #else 1354 void * result= ::dlopen(filename, RTLD_LAZY); 1355 if (result != NULL) { 1356 // Successful loading 1357 return result; 1358 } 1359 1360 // Read system error message into ebuf 1361 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1362 ebuf[ebuflen-1]='\0'; 1363 1364 return NULL; 1365 #endif // STATIC_BUILD 1366 } 1367 #else 1368 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1369 #ifdef STATIC_BUILD 1370 return os::get_default_process_handle(); 1371 #else 1372 void * result= ::dlopen(filename, RTLD_LAZY); 1373 if (result != NULL) { 1374 // Successful loading 1375 return result; 1376 } 1377 1378 Elf32_Ehdr elf_head; 1379 1380 // Read system error message into ebuf 1381 // It may or may not be overwritten below 1382 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1383 ebuf[ebuflen-1]='\0'; 1384 int diag_msg_max_length=ebuflen-strlen(ebuf); 1385 char* diag_msg_buf=ebuf+strlen(ebuf); 1386 1387 if (diag_msg_max_length==0) { 1388 // No more space in ebuf for additional diagnostics message 1389 return NULL; 1390 } 1391 1392 1393 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1394 1395 if (file_descriptor < 0) { 1396 // Can't open library, report dlerror() message 1397 return NULL; 1398 } 1399 1400 bool failed_to_read_elf_head= 1401 (sizeof(elf_head)!= 1402 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1403 1404 ::close(file_descriptor); 1405 if (failed_to_read_elf_head) { 1406 // file i/o error - report dlerror() msg 1407 return NULL; 1408 } 1409 1410 typedef struct { 1411 Elf32_Half code; // Actual value as defined in elf.h 1412 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1413 char elf_class; // 32 or 64 bit 1414 char endianess; // MSB or LSB 1415 char* name; // String representation 1416 } arch_t; 1417 1418 #ifndef EM_486 1419 #define EM_486 6 /* Intel 80486 */ 1420 #endif 1421 1422 #ifndef EM_MIPS_RS3_LE 1423 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1424 #endif 1425 1426 #ifndef EM_PPC64 1427 #define EM_PPC64 21 /* PowerPC64 */ 1428 #endif 1429 1430 #ifndef EM_S390 1431 #define EM_S390 22 /* IBM System/390 */ 1432 #endif 1433 1434 #ifndef EM_IA_64 1435 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1436 #endif 1437 1438 #ifndef EM_X86_64 1439 #define EM_X86_64 62 /* AMD x86-64 */ 1440 #endif 1441 1442 static const arch_t arch_array[]={ 1443 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1444 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1445 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1446 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1447 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1448 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1449 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1450 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1451 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1452 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1453 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1454 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1455 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1456 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1457 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1458 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1459 }; 1460 1461 #if (defined IA32) 1462 static Elf32_Half running_arch_code=EM_386; 1463 #elif (defined AMD64) 1464 static Elf32_Half running_arch_code=EM_X86_64; 1465 #elif (defined IA64) 1466 static Elf32_Half running_arch_code=EM_IA_64; 1467 #elif (defined __sparc) && (defined _LP64) 1468 static Elf32_Half running_arch_code=EM_SPARCV9; 1469 #elif (defined __sparc) && (!defined _LP64) 1470 static Elf32_Half running_arch_code=EM_SPARC; 1471 #elif (defined __powerpc64__) 1472 static Elf32_Half running_arch_code=EM_PPC64; 1473 #elif (defined __powerpc__) 1474 static Elf32_Half running_arch_code=EM_PPC; 1475 #elif (defined ARM) 1476 static Elf32_Half running_arch_code=EM_ARM; 1477 #elif (defined S390) 1478 static Elf32_Half running_arch_code=EM_S390; 1479 #elif (defined ALPHA) 1480 static Elf32_Half running_arch_code=EM_ALPHA; 1481 #elif (defined MIPSEL) 1482 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1483 #elif (defined PARISC) 1484 static Elf32_Half running_arch_code=EM_PARISC; 1485 #elif (defined MIPS) 1486 static Elf32_Half running_arch_code=EM_MIPS; 1487 #elif (defined M68K) 1488 static Elf32_Half running_arch_code=EM_68K; 1489 #else 1490 #error Method os::dll_load requires that one of following is defined:\ 1491 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1492 #endif 1493 1494 // Identify compatability class for VM's architecture and library's architecture 1495 // Obtain string descriptions for architectures 1496 1497 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1498 int running_arch_index=-1; 1499 1500 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1501 if (running_arch_code == arch_array[i].code) { 1502 running_arch_index = i; 1503 } 1504 if (lib_arch.code == arch_array[i].code) { 1505 lib_arch.compat_class = arch_array[i].compat_class; 1506 lib_arch.name = arch_array[i].name; 1507 } 1508 } 1509 1510 assert(running_arch_index != -1, 1511 "Didn't find running architecture code (running_arch_code) in arch_array"); 1512 if (running_arch_index == -1) { 1513 // Even though running architecture detection failed 1514 // we may still continue with reporting dlerror() message 1515 return NULL; 1516 } 1517 1518 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1519 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1520 return NULL; 1521 } 1522 1523 #ifndef S390 1524 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1525 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1526 return NULL; 1527 } 1528 #endif // !S390 1529 1530 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1531 if (lib_arch.name!=NULL) { 1532 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1533 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1534 lib_arch.name, arch_array[running_arch_index].name); 1535 } else { 1536 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1537 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1538 lib_arch.code, 1539 arch_array[running_arch_index].name); 1540 } 1541 } 1542 1543 return NULL; 1544 #endif // STATIC_BUILD 1545 } 1546 #endif // !__APPLE__ 1547 1548 void* os::get_default_process_handle() { 1549 #ifdef __APPLE__ 1550 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1551 // to avoid finding unexpected symbols on second (or later) 1552 // loads of a library. 1553 return (void*)::dlopen(NULL, RTLD_FIRST); 1554 #else 1555 return (void*)::dlopen(NULL, RTLD_LAZY); 1556 #endif 1557 } 1558 1559 // XXX: Do we need a lock around this as per Linux? 1560 void* os::dll_lookup(void* handle, const char* name) { 1561 return dlsym(handle, name); 1562 } 1563 1564 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1565 outputStream * out = (outputStream *) param; 1566 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1567 return 0; 1568 } 1569 1570 void os::print_dll_info(outputStream *st) { 1571 st->print_cr("Dynamic libraries:"); 1572 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1573 st->print_cr("Error: Cannot print dynamic libraries."); 1574 } 1575 } 1576 1577 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1578 #ifdef RTLD_DI_LINKMAP 1579 Dl_info dli; 1580 void *handle; 1581 Link_map *map; 1582 Link_map *p; 1583 1584 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1585 dli.dli_fname == NULL) { 1586 return 1; 1587 } 1588 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1589 if (handle == NULL) { 1590 return 1; 1591 } 1592 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1593 if (map == NULL) { 1594 dlclose(handle); 1595 return 1; 1596 } 1597 1598 while (map->l_prev != NULL) 1599 map = map->l_prev; 1600 1601 while (map != NULL) { 1602 // Value for top_address is returned as 0 since we don't have any information about module size 1603 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1604 dlclose(handle); 1605 return 1; 1606 } 1607 map = map->l_next; 1608 } 1609 1610 dlclose(handle); 1611 #elif defined(__APPLE__) 1612 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1613 // Value for top_address is returned as 0 since we don't have any information about module size 1614 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1615 return 1; 1616 } 1617 } 1618 return 0; 1619 #else 1620 return 1; 1621 #endif 1622 } 1623 1624 void os::get_summary_os_info(char* buf, size_t buflen) { 1625 // These buffers are small because we want this to be brief 1626 // and not use a lot of stack while generating the hs_err file. 1627 char os[100]; 1628 size_t size = sizeof(os); 1629 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1630 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1631 #ifdef __APPLE__ 1632 strncpy(os, "Darwin", sizeof(os)); 1633 #elif __OpenBSD__ 1634 strncpy(os, "OpenBSD", sizeof(os)); 1635 #else 1636 strncpy(os, "BSD", sizeof(os)); 1637 #endif 1638 } 1639 1640 char release[100]; 1641 size = sizeof(release); 1642 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1643 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1644 // if error, leave blank 1645 strncpy(release, "", sizeof(release)); 1646 } 1647 snprintf(buf, buflen, "%s %s", os, release); 1648 } 1649 1650 void os::print_os_info_brief(outputStream* st) { 1651 os::Posix::print_uname_info(st); 1652 } 1653 1654 void os::print_os_info(outputStream* st) { 1655 st->print("OS:"); 1656 1657 os::Posix::print_uname_info(st); 1658 1659 os::Posix::print_rlimit_info(st); 1660 1661 os::Posix::print_load_average(st); 1662 } 1663 1664 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1665 // Nothing to do for now. 1666 } 1667 1668 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1669 unsigned int mhz; 1670 size_t size = sizeof(mhz); 1671 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1672 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1673 mhz = 1; // looks like an error but can be divided by 1674 } else { 1675 mhz /= 1000000; // reported in millions 1676 } 1677 1678 char model[100]; 1679 size = sizeof(model); 1680 int mib_model[] = { CTL_HW, HW_MODEL }; 1681 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1682 strncpy(model, cpu_arch, sizeof(model)); 1683 } 1684 1685 char machine[100]; 1686 size = sizeof(machine); 1687 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1688 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1689 strncpy(machine, "", sizeof(machine)); 1690 } 1691 1692 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1693 } 1694 1695 void os::print_memory_info(outputStream* st) { 1696 1697 st->print("Memory:"); 1698 st->print(" %dk page", os::vm_page_size()>>10); 1699 1700 st->print(", physical " UINT64_FORMAT "k", 1701 os::physical_memory() >> 10); 1702 st->print("(" UINT64_FORMAT "k free)", 1703 os::available_memory() >> 10); 1704 st->cr(); 1705 } 1706 1707 static void print_signal_handler(outputStream* st, int sig, 1708 char* buf, size_t buflen); 1709 1710 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1711 st->print_cr("Signal Handlers:"); 1712 print_signal_handler(st, SIGSEGV, buf, buflen); 1713 print_signal_handler(st, SIGBUS , buf, buflen); 1714 print_signal_handler(st, SIGFPE , buf, buflen); 1715 print_signal_handler(st, SIGPIPE, buf, buflen); 1716 print_signal_handler(st, SIGXFSZ, buf, buflen); 1717 print_signal_handler(st, SIGILL , buf, buflen); 1718 print_signal_handler(st, SR_signum, buf, buflen); 1719 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1720 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1721 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1722 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1723 } 1724 1725 static char saved_jvm_path[MAXPATHLEN] = {0}; 1726 1727 // Find the full path to the current module, libjvm 1728 void os::jvm_path(char *buf, jint buflen) { 1729 // Error checking. 1730 if (buflen < MAXPATHLEN) { 1731 assert(false, "must use a large-enough buffer"); 1732 buf[0] = '\0'; 1733 return; 1734 } 1735 // Lazy resolve the path to current module. 1736 if (saved_jvm_path[0] != 0) { 1737 strcpy(buf, saved_jvm_path); 1738 return; 1739 } 1740 1741 char dli_fname[MAXPATHLEN]; 1742 bool ret = dll_address_to_library_name( 1743 CAST_FROM_FN_PTR(address, os::jvm_path), 1744 dli_fname, sizeof(dli_fname), NULL); 1745 assert(ret, "cannot locate libjvm"); 1746 char *rp = NULL; 1747 if (ret && dli_fname[0] != '\0') { 1748 rp = os::Posix::realpath(dli_fname, buf, buflen); 1749 } 1750 if (rp == NULL) { 1751 return; 1752 } 1753 1754 if (Arguments::sun_java_launcher_is_altjvm()) { 1755 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1756 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1757 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1758 // appears at the right place in the string, then assume we are 1759 // installed in a JDK and we're done. Otherwise, check for a 1760 // JAVA_HOME environment variable and construct a path to the JVM 1761 // being overridden. 1762 1763 const char *p = buf + strlen(buf) - 1; 1764 for (int count = 0; p > buf && count < 5; ++count) { 1765 for (--p; p > buf && *p != '/'; --p) 1766 /* empty */ ; 1767 } 1768 1769 if (strncmp(p, "/jre/lib/", 9) != 0) { 1770 // Look for JAVA_HOME in the environment. 1771 char* java_home_var = ::getenv("JAVA_HOME"); 1772 if (java_home_var != NULL && java_home_var[0] != 0) { 1773 char* jrelib_p; 1774 int len; 1775 1776 // Check the current module name "libjvm" 1777 p = strrchr(buf, '/'); 1778 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1779 1780 rp = os::Posix::realpath(java_home_var, buf, buflen); 1781 if (rp == NULL) { 1782 return; 1783 } 1784 1785 // determine if this is a legacy image or modules image 1786 // modules image doesn't have "jre" subdirectory 1787 len = strlen(buf); 1788 assert(len < buflen, "Ran out of buffer space"); 1789 jrelib_p = buf + len; 1790 1791 // Add the appropriate library subdir 1792 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1793 if (0 != access(buf, F_OK)) { 1794 snprintf(jrelib_p, buflen-len, "/lib"); 1795 } 1796 1797 // Add the appropriate client or server subdir 1798 len = strlen(buf); 1799 jrelib_p = buf + len; 1800 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1801 if (0 != access(buf, F_OK)) { 1802 snprintf(jrelib_p, buflen-len, "%s", ""); 1803 } 1804 1805 // If the path exists within JAVA_HOME, add the JVM library name 1806 // to complete the path to JVM being overridden. Otherwise fallback 1807 // to the path to the current library. 1808 if (0 == access(buf, F_OK)) { 1809 // Use current module name "libjvm" 1810 len = strlen(buf); 1811 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1812 } else { 1813 // Fall back to path of current library 1814 rp = os::Posix::realpath(dli_fname, buf, buflen); 1815 if (rp == NULL) { 1816 return; 1817 } 1818 } 1819 } 1820 } 1821 } 1822 1823 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1824 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1825 } 1826 1827 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1828 // no prefix required, not even "_" 1829 } 1830 1831 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1832 // no suffix required 1833 } 1834 1835 //////////////////////////////////////////////////////////////////////////////// 1836 // sun.misc.Signal support 1837 1838 static volatile jint sigint_count = 0; 1839 1840 static void UserHandler(int sig, void *siginfo, void *context) { 1841 // 4511530 - sem_post is serialized and handled by the manager thread. When 1842 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1843 // don't want to flood the manager thread with sem_post requests. 1844 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1845 return; 1846 } 1847 1848 // Ctrl-C is pressed during error reporting, likely because the error 1849 // handler fails to abort. Let VM die immediately. 1850 if (sig == SIGINT && VMError::is_error_reported()) { 1851 os::die(); 1852 } 1853 1854 os::signal_notify(sig); 1855 } 1856 1857 void* os::user_handler() { 1858 return CAST_FROM_FN_PTR(void*, UserHandler); 1859 } 1860 1861 extern "C" { 1862 typedef void (*sa_handler_t)(int); 1863 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1864 } 1865 1866 void* os::signal(int signal_number, void* handler) { 1867 struct sigaction sigAct, oldSigAct; 1868 1869 sigfillset(&(sigAct.sa_mask)); 1870 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1871 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1872 1873 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1874 // -1 means registration failed 1875 return (void *)-1; 1876 } 1877 1878 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1879 } 1880 1881 void os::signal_raise(int signal_number) { 1882 ::raise(signal_number); 1883 } 1884 1885 // The following code is moved from os.cpp for making this 1886 // code platform specific, which it is by its very nature. 1887 1888 // Will be modified when max signal is changed to be dynamic 1889 int os::sigexitnum_pd() { 1890 return NSIG; 1891 } 1892 1893 // a counter for each possible signal value 1894 static volatile jint pending_signals[NSIG+1] = { 0 }; 1895 1896 // Bsd(POSIX) specific hand shaking semaphore. 1897 #ifdef __APPLE__ 1898 typedef semaphore_t os_semaphore_t; 1899 1900 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1901 #define SEM_WAIT(sem) semaphore_wait(sem) 1902 #define SEM_POST(sem) semaphore_signal(sem) 1903 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1904 #else 1905 typedef sem_t os_semaphore_t; 1906 1907 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1908 #define SEM_WAIT(sem) sem_wait(&sem) 1909 #define SEM_POST(sem) sem_post(&sem) 1910 #define SEM_DESTROY(sem) sem_destroy(&sem) 1911 #endif 1912 1913 #ifdef __APPLE__ 1914 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. 1915 1916 static const char* sem_init_strerror(kern_return_t value) { 1917 switch (value) { 1918 case KERN_INVALID_ARGUMENT: return "Invalid argument"; 1919 case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; 1920 default: return "Unknown"; 1921 } 1922 } 1923 1924 OSXSemaphore::OSXSemaphore(uint value) { 1925 kern_return_t ret = SEM_INIT(_semaphore, value); 1926 1927 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); 1928 } 1929 1930 OSXSemaphore::~OSXSemaphore() { 1931 SEM_DESTROY(_semaphore); 1932 } 1933 1934 void OSXSemaphore::signal(uint count) { 1935 for (uint i = 0; i < count; i++) { 1936 kern_return_t ret = SEM_POST(_semaphore); 1937 1938 assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); 1939 } 1940 } 1941 1942 void OSXSemaphore::wait() { 1943 kern_return_t ret; 1944 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) { 1945 // Semaphore was interrupted. Retry. 1946 } 1947 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); 1948 } 1949 1950 jlong OSXSemaphore::currenttime() { 1951 struct timeval tv; 1952 gettimeofday(&tv, NULL); 1953 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1954 } 1955 1956 bool OSXSemaphore::trywait() { 1957 return timedwait(0, 0); 1958 } 1959 1960 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { 1961 kern_return_t kr = KERN_ABORTED; 1962 mach_timespec_t waitspec; 1963 waitspec.tv_sec = sec; 1964 waitspec.tv_nsec = nsec; 1965 1966 jlong starttime = currenttime(); 1967 1968 kr = semaphore_timedwait(_semaphore, waitspec); 1969 while (kr == KERN_ABORTED) { 1970 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1971 1972 jlong current = currenttime(); 1973 jlong passedtime = current - starttime; 1974 1975 if (passedtime >= totalwait) { 1976 waitspec.tv_sec = 0; 1977 waitspec.tv_nsec = 0; 1978 } else { 1979 jlong waittime = totalwait - (current - starttime); 1980 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1981 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1982 } 1983 1984 kr = semaphore_timedwait(_semaphore, waitspec); 1985 } 1986 1987 return kr == KERN_SUCCESS; 1988 } 1989 1990 #else 1991 // Use POSIX implementation of semaphores. 1992 1993 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 1994 struct timespec ts; 1995 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 1996 1997 return ts; 1998 } 1999 2000 #endif // __APPLE__ 2001 2002 static os_semaphore_t sig_sem; 2003 2004 #ifdef __APPLE__ 2005 static OSXSemaphore sr_semaphore; 2006 #else 2007 static PosixSemaphore sr_semaphore; 2008 #endif 2009 2010 void os::signal_init_pd() { 2011 // Initialize signal structures 2012 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2013 2014 // Initialize signal semaphore 2015 ::SEM_INIT(sig_sem, 0); 2016 } 2017 2018 void os::signal_notify(int sig) { 2019 Atomic::inc(&pending_signals[sig]); 2020 ::SEM_POST(sig_sem); 2021 } 2022 2023 static int check_pending_signals(bool wait) { 2024 Atomic::store(0, &sigint_count); 2025 for (;;) { 2026 for (int i = 0; i < NSIG + 1; i++) { 2027 jint n = pending_signals[i]; 2028 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2029 return i; 2030 } 2031 } 2032 if (!wait) { 2033 return -1; 2034 } 2035 JavaThread *thread = JavaThread::current(); 2036 ThreadBlockInVM tbivm(thread); 2037 2038 bool threadIsSuspended; 2039 do { 2040 thread->set_suspend_equivalent(); 2041 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2042 ::SEM_WAIT(sig_sem); 2043 2044 // were we externally suspended while we were waiting? 2045 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2046 if (threadIsSuspended) { 2047 // The semaphore has been incremented, but while we were waiting 2048 // another thread suspended us. We don't want to continue running 2049 // while suspended because that would surprise the thread that 2050 // suspended us. 2051 ::SEM_POST(sig_sem); 2052 2053 thread->java_suspend_self(); 2054 } 2055 } while (threadIsSuspended); 2056 } 2057 } 2058 2059 int os::signal_lookup() { 2060 return check_pending_signals(false); 2061 } 2062 2063 int os::signal_wait() { 2064 return check_pending_signals(true); 2065 } 2066 2067 //////////////////////////////////////////////////////////////////////////////// 2068 // Virtual Memory 2069 2070 int os::vm_page_size() { 2071 // Seems redundant as all get out 2072 assert(os::Bsd::page_size() != -1, "must call os::init"); 2073 return os::Bsd::page_size(); 2074 } 2075 2076 // Solaris allocates memory by pages. 2077 int os::vm_allocation_granularity() { 2078 assert(os::Bsd::page_size() != -1, "must call os::init"); 2079 return os::Bsd::page_size(); 2080 } 2081 2082 // Rationale behind this function: 2083 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2084 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2085 // samples for JITted code. Here we create private executable mapping over the code cache 2086 // and then we can use standard (well, almost, as mapping can change) way to provide 2087 // info for the reporting script by storing timestamp and location of symbol 2088 void bsd_wrap_code(char* base, size_t size) { 2089 static volatile jint cnt = 0; 2090 2091 if (!UseOprofile) { 2092 return; 2093 } 2094 2095 char buf[PATH_MAX + 1]; 2096 int num = Atomic::add(1, &cnt); 2097 2098 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2099 os::get_temp_directory(), os::current_process_id(), num); 2100 unlink(buf); 2101 2102 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2103 2104 if (fd != -1) { 2105 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2106 if (rv != (off_t)-1) { 2107 if (::write(fd, "", 1) == 1) { 2108 mmap(base, size, 2109 PROT_READ|PROT_WRITE|PROT_EXEC, 2110 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2111 } 2112 } 2113 ::close(fd); 2114 unlink(buf); 2115 } 2116 } 2117 2118 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2119 int err) { 2120 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2121 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2122 os::errno_name(err), err); 2123 } 2124 2125 // NOTE: Bsd kernel does not really reserve the pages for us. 2126 // All it does is to check if there are enough free pages 2127 // left at the time of mmap(). This could be a potential 2128 // problem. 2129 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2130 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2131 #ifdef __OpenBSD__ 2132 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2133 if (::mprotect(addr, size, prot) == 0) { 2134 return true; 2135 } 2136 #else 2137 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2138 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2139 if (res != (uintptr_t) MAP_FAILED) { 2140 return true; 2141 } 2142 #endif 2143 2144 // Warn about any commit errors we see in non-product builds just 2145 // in case mmap() doesn't work as described on the man page. 2146 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2147 2148 return false; 2149 } 2150 2151 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2152 bool exec) { 2153 // alignment_hint is ignored on this OS 2154 return pd_commit_memory(addr, size, exec); 2155 } 2156 2157 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2158 const char* mesg) { 2159 assert(mesg != NULL, "mesg must be specified"); 2160 if (!pd_commit_memory(addr, size, exec)) { 2161 // add extra info in product mode for vm_exit_out_of_memory(): 2162 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2163 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2164 } 2165 } 2166 2167 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2168 size_t alignment_hint, bool exec, 2169 const char* mesg) { 2170 // alignment_hint is ignored on this OS 2171 pd_commit_memory_or_exit(addr, size, exec, mesg); 2172 } 2173 2174 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2175 } 2176 2177 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2178 ::madvise(addr, bytes, MADV_DONTNEED); 2179 } 2180 2181 void os::numa_make_global(char *addr, size_t bytes) { 2182 } 2183 2184 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2185 } 2186 2187 bool os::numa_topology_changed() { return false; } 2188 2189 size_t os::numa_get_groups_num() { 2190 return 1; 2191 } 2192 2193 int os::numa_get_group_id() { 2194 return 0; 2195 } 2196 2197 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2198 if (size > 0) { 2199 ids[0] = 0; 2200 return 1; 2201 } 2202 return 0; 2203 } 2204 2205 bool os::get_page_info(char *start, page_info* info) { 2206 return false; 2207 } 2208 2209 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2210 return end; 2211 } 2212 2213 2214 bool os::pd_uncommit_memory(char* addr, size_t size) { 2215 #ifdef __OpenBSD__ 2216 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2217 return ::mprotect(addr, size, PROT_NONE) == 0; 2218 #else 2219 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2220 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2221 return res != (uintptr_t) MAP_FAILED; 2222 #endif 2223 } 2224 2225 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2226 return os::commit_memory(addr, size, !ExecMem); 2227 } 2228 2229 // If this is a growable mapping, remove the guard pages entirely by 2230 // munmap()ping them. If not, just call uncommit_memory(). 2231 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2232 return os::uncommit_memory(addr, size); 2233 } 2234 2235 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2236 // at 'requested_addr'. If there are existing memory mappings at the same 2237 // location, however, they will be overwritten. If 'fixed' is false, 2238 // 'requested_addr' is only treated as a hint, the return value may or 2239 // may not start from the requested address. Unlike Bsd mmap(), this 2240 // function returns NULL to indicate failure. 2241 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2242 char * addr; 2243 int flags; 2244 2245 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2246 if (fixed) { 2247 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2248 flags |= MAP_FIXED; 2249 } 2250 2251 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2252 // touch an uncommitted page. Otherwise, the read/write might 2253 // succeed if we have enough swap space to back the physical page. 2254 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2255 flags, -1, 0); 2256 2257 return addr == MAP_FAILED ? NULL : addr; 2258 } 2259 2260 static int anon_munmap(char * addr, size_t size) { 2261 return ::munmap(addr, size) == 0; 2262 } 2263 2264 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2265 size_t alignment_hint) { 2266 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2267 } 2268 2269 bool os::pd_release_memory(char* addr, size_t size) { 2270 return anon_munmap(addr, size); 2271 } 2272 2273 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2274 // Bsd wants the mprotect address argument to be page aligned. 2275 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2276 2277 // According to SUSv3, mprotect() should only be used with mappings 2278 // established by mmap(), and mmap() always maps whole pages. Unaligned 2279 // 'addr' likely indicates problem in the VM (e.g. trying to change 2280 // protection of malloc'ed or statically allocated memory). Check the 2281 // caller if you hit this assert. 2282 assert(addr == bottom, "sanity check"); 2283 2284 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2285 return ::mprotect(bottom, size, prot) == 0; 2286 } 2287 2288 // Set protections specified 2289 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2290 bool is_committed) { 2291 unsigned int p = 0; 2292 switch (prot) { 2293 case MEM_PROT_NONE: p = PROT_NONE; break; 2294 case MEM_PROT_READ: p = PROT_READ; break; 2295 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2296 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2297 default: 2298 ShouldNotReachHere(); 2299 } 2300 // is_committed is unused. 2301 return bsd_mprotect(addr, bytes, p); 2302 } 2303 2304 bool os::guard_memory(char* addr, size_t size) { 2305 return bsd_mprotect(addr, size, PROT_NONE); 2306 } 2307 2308 bool os::unguard_memory(char* addr, size_t size) { 2309 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2310 } 2311 2312 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2313 return false; 2314 } 2315 2316 // Large page support 2317 2318 static size_t _large_page_size = 0; 2319 2320 void os::large_page_init() { 2321 } 2322 2323 2324 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2325 fatal("This code is not used or maintained."); 2326 2327 // "exec" is passed in but not used. Creating the shared image for 2328 // the code cache doesn't have an SHM_X executable permission to check. 2329 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2330 2331 key_t key = IPC_PRIVATE; 2332 char *addr; 2333 2334 bool warn_on_failure = UseLargePages && 2335 (!FLAG_IS_DEFAULT(UseLargePages) || 2336 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2337 2338 // Create a large shared memory region to attach to based on size. 2339 // Currently, size is the total size of the heap 2340 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2341 if (shmid == -1) { 2342 // Possible reasons for shmget failure: 2343 // 1. shmmax is too small for Java heap. 2344 // > check shmmax value: cat /proc/sys/kernel/shmmax 2345 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2346 // 2. not enough large page memory. 2347 // > check available large pages: cat /proc/meminfo 2348 // > increase amount of large pages: 2349 // echo new_value > /proc/sys/vm/nr_hugepages 2350 // Note 1: different Bsd may use different name for this property, 2351 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2352 // Note 2: it's possible there's enough physical memory available but 2353 // they are so fragmented after a long run that they can't 2354 // coalesce into large pages. Try to reserve large pages when 2355 // the system is still "fresh". 2356 if (warn_on_failure) { 2357 warning("Failed to reserve shared memory (errno = %d).", errno); 2358 } 2359 return NULL; 2360 } 2361 2362 // attach to the region 2363 addr = (char*)shmat(shmid, req_addr, 0); 2364 int err = errno; 2365 2366 // Remove shmid. If shmat() is successful, the actual shared memory segment 2367 // will be deleted when it's detached by shmdt() or when the process 2368 // terminates. If shmat() is not successful this will remove the shared 2369 // segment immediately. 2370 shmctl(shmid, IPC_RMID, NULL); 2371 2372 if ((intptr_t)addr == -1) { 2373 if (warn_on_failure) { 2374 warning("Failed to attach shared memory (errno = %d).", err); 2375 } 2376 return NULL; 2377 } 2378 2379 // The memory is committed 2380 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2381 2382 return addr; 2383 } 2384 2385 bool os::release_memory_special(char* base, size_t bytes) { 2386 if (MemTracker::tracking_level() > NMT_minimal) { 2387 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2388 // detaching the SHM segment will also delete it, see reserve_memory_special() 2389 int rslt = shmdt(base); 2390 if (rslt == 0) { 2391 tkr.record((address)base, bytes); 2392 return true; 2393 } else { 2394 return false; 2395 } 2396 } else { 2397 return shmdt(base) == 0; 2398 } 2399 } 2400 2401 size_t os::large_page_size() { 2402 return _large_page_size; 2403 } 2404 2405 // HugeTLBFS allows application to commit large page memory on demand; 2406 // with SysV SHM the entire memory region must be allocated as shared 2407 // memory. 2408 bool os::can_commit_large_page_memory() { 2409 return UseHugeTLBFS; 2410 } 2411 2412 bool os::can_execute_large_page_memory() { 2413 return UseHugeTLBFS; 2414 } 2415 2416 // Reserve memory at an arbitrary address, only if that area is 2417 // available (and not reserved for something else). 2418 2419 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2420 const int max_tries = 10; 2421 char* base[max_tries]; 2422 size_t size[max_tries]; 2423 const size_t gap = 0x000000; 2424 2425 // Assert only that the size is a multiple of the page size, since 2426 // that's all that mmap requires, and since that's all we really know 2427 // about at this low abstraction level. If we need higher alignment, 2428 // we can either pass an alignment to this method or verify alignment 2429 // in one of the methods further up the call chain. See bug 5044738. 2430 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2431 2432 // Repeatedly allocate blocks until the block is allocated at the 2433 // right spot. 2434 2435 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2436 // if kernel honors the hint then we can return immediately. 2437 char * addr = anon_mmap(requested_addr, bytes, false); 2438 if (addr == requested_addr) { 2439 return requested_addr; 2440 } 2441 2442 if (addr != NULL) { 2443 // mmap() is successful but it fails to reserve at the requested address 2444 anon_munmap(addr, bytes); 2445 } 2446 2447 int i; 2448 for (i = 0; i < max_tries; ++i) { 2449 base[i] = reserve_memory(bytes); 2450 2451 if (base[i] != NULL) { 2452 // Is this the block we wanted? 2453 if (base[i] == requested_addr) { 2454 size[i] = bytes; 2455 break; 2456 } 2457 2458 // Does this overlap the block we wanted? Give back the overlapped 2459 // parts and try again. 2460 2461 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2462 if (top_overlap >= 0 && top_overlap < bytes) { 2463 unmap_memory(base[i], top_overlap); 2464 base[i] += top_overlap; 2465 size[i] = bytes - top_overlap; 2466 } else { 2467 size_t bottom_overlap = base[i] + bytes - requested_addr; 2468 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2469 unmap_memory(requested_addr, bottom_overlap); 2470 size[i] = bytes - bottom_overlap; 2471 } else { 2472 size[i] = bytes; 2473 } 2474 } 2475 } 2476 } 2477 2478 // Give back the unused reserved pieces. 2479 2480 for (int j = 0; j < i; ++j) { 2481 if (base[j] != NULL) { 2482 unmap_memory(base[j], size[j]); 2483 } 2484 } 2485 2486 if (i < max_tries) { 2487 return requested_addr; 2488 } else { 2489 return NULL; 2490 } 2491 } 2492 2493 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2494 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2495 } 2496 2497 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2498 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2499 } 2500 2501 void os::naked_short_sleep(jlong ms) { 2502 struct timespec req; 2503 2504 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2505 req.tv_sec = 0; 2506 if (ms > 0) { 2507 req.tv_nsec = (ms % 1000) * 1000000; 2508 } else { 2509 req.tv_nsec = 1; 2510 } 2511 2512 nanosleep(&req, NULL); 2513 2514 return; 2515 } 2516 2517 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2518 void os::infinite_sleep() { 2519 while (true) { // sleep forever ... 2520 ::sleep(100); // ... 100 seconds at a time 2521 } 2522 } 2523 2524 // Used to convert frequent JVM_Yield() to nops 2525 bool os::dont_yield() { 2526 return DontYieldALot; 2527 } 2528 2529 void os::naked_yield() { 2530 sched_yield(); 2531 } 2532 2533 //////////////////////////////////////////////////////////////////////////////// 2534 // thread priority support 2535 2536 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2537 // only supports dynamic priority, static priority must be zero. For real-time 2538 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2539 // However, for large multi-threaded applications, SCHED_RR is not only slower 2540 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2541 // of 5 runs - Sep 2005). 2542 // 2543 // The following code actually changes the niceness of kernel-thread/LWP. It 2544 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2545 // not the entire user process, and user level threads are 1:1 mapped to kernel 2546 // threads. It has always been the case, but could change in the future. For 2547 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2548 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2549 2550 #if !defined(__APPLE__) 2551 int os::java_to_os_priority[CriticalPriority + 1] = { 2552 19, // 0 Entry should never be used 2553 2554 0, // 1 MinPriority 2555 3, // 2 2556 6, // 3 2557 2558 10, // 4 2559 15, // 5 NormPriority 2560 18, // 6 2561 2562 21, // 7 2563 25, // 8 2564 28, // 9 NearMaxPriority 2565 2566 31, // 10 MaxPriority 2567 2568 31 // 11 CriticalPriority 2569 }; 2570 #else 2571 // Using Mach high-level priority assignments 2572 int os::java_to_os_priority[CriticalPriority + 1] = { 2573 0, // 0 Entry should never be used (MINPRI_USER) 2574 2575 27, // 1 MinPriority 2576 28, // 2 2577 29, // 3 2578 2579 30, // 4 2580 31, // 5 NormPriority (BASEPRI_DEFAULT) 2581 32, // 6 2582 2583 33, // 7 2584 34, // 8 2585 35, // 9 NearMaxPriority 2586 2587 36, // 10 MaxPriority 2588 2589 36 // 11 CriticalPriority 2590 }; 2591 #endif 2592 2593 static int prio_init() { 2594 if (ThreadPriorityPolicy == 1) { 2595 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2596 // if effective uid is not root. Perhaps, a more elegant way of doing 2597 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2598 if (geteuid() != 0) { 2599 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2600 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2601 } 2602 ThreadPriorityPolicy = 0; 2603 } 2604 } 2605 if (UseCriticalJavaThreadPriority) { 2606 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2607 } 2608 return 0; 2609 } 2610 2611 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2612 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2613 2614 #ifdef __OpenBSD__ 2615 // OpenBSD pthread_setprio starves low priority threads 2616 return OS_OK; 2617 #elif defined(__FreeBSD__) 2618 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2619 #elif defined(__APPLE__) || defined(__NetBSD__) 2620 struct sched_param sp; 2621 int policy; 2622 pthread_t self = pthread_self(); 2623 2624 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2625 return OS_ERR; 2626 } 2627 2628 sp.sched_priority = newpri; 2629 if (pthread_setschedparam(self, policy, &sp) != 0) { 2630 return OS_ERR; 2631 } 2632 2633 return OS_OK; 2634 #else 2635 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2636 return (ret == 0) ? OS_OK : OS_ERR; 2637 #endif 2638 } 2639 2640 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2641 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2642 *priority_ptr = java_to_os_priority[NormPriority]; 2643 return OS_OK; 2644 } 2645 2646 errno = 0; 2647 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2648 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2649 #elif defined(__APPLE__) || defined(__NetBSD__) 2650 int policy; 2651 struct sched_param sp; 2652 2653 pthread_getschedparam(pthread_self(), &policy, &sp); 2654 *priority_ptr = sp.sched_priority; 2655 #else 2656 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2657 #endif 2658 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2659 } 2660 2661 // Hint to the underlying OS that a task switch would not be good. 2662 // Void return because it's a hint and can fail. 2663 void os::hint_no_preempt() {} 2664 2665 //////////////////////////////////////////////////////////////////////////////// 2666 // suspend/resume support 2667 2668 // the low-level signal-based suspend/resume support is a remnant from the 2669 // old VM-suspension that used to be for java-suspension, safepoints etc, 2670 // within hotspot. Now there is a single use-case for this: 2671 // - calling get_thread_pc() on the VMThread by the flat-profiler task 2672 // that runs in the watcher thread. 2673 // The remaining code is greatly simplified from the more general suspension 2674 // code that used to be used. 2675 // 2676 // The protocol is quite simple: 2677 // - suspend: 2678 // - sends a signal to the target thread 2679 // - polls the suspend state of the osthread using a yield loop 2680 // - target thread signal handler (SR_handler) sets suspend state 2681 // and blocks in sigsuspend until continued 2682 // - resume: 2683 // - sets target osthread state to continue 2684 // - sends signal to end the sigsuspend loop in the SR_handler 2685 // 2686 // Note that the SR_lock plays no role in this suspend/resume protocol, 2687 // but is checked for NULL in SR_handler as a thread termination indicator. 2688 2689 static void resume_clear_context(OSThread *osthread) { 2690 osthread->set_ucontext(NULL); 2691 osthread->set_siginfo(NULL); 2692 } 2693 2694 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2695 osthread->set_ucontext(context); 2696 osthread->set_siginfo(siginfo); 2697 } 2698 2699 // Handler function invoked when a thread's execution is suspended or 2700 // resumed. We have to be careful that only async-safe functions are 2701 // called here (Note: most pthread functions are not async safe and 2702 // should be avoided.) 2703 // 2704 // Note: sigwait() is a more natural fit than sigsuspend() from an 2705 // interface point of view, but sigwait() prevents the signal hander 2706 // from being run. libpthread would get very confused by not having 2707 // its signal handlers run and prevents sigwait()'s use with the 2708 // mutex granting granting signal. 2709 // 2710 // Currently only ever called on the VMThread or JavaThread 2711 // 2712 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2713 // Save and restore errno to avoid confusing native code with EINTR 2714 // after sigsuspend. 2715 int old_errno = errno; 2716 2717 Thread* thread = Thread::current_or_null_safe(); 2718 assert(thread != NULL, "Missing current thread in SR_handler"); 2719 2720 // On some systems we have seen signal delivery get "stuck" until the signal 2721 // mask is changed as part of thread termination. Check that the current thread 2722 // has not already terminated (via SR_lock()) - else the following assertion 2723 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2724 // destructor has completed. 2725 2726 if (thread->SR_lock() == NULL) { 2727 return; 2728 } 2729 2730 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2731 2732 OSThread* osthread = thread->osthread(); 2733 2734 os::SuspendResume::State current = osthread->sr.state(); 2735 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2736 suspend_save_context(osthread, siginfo, context); 2737 2738 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2739 os::SuspendResume::State state = osthread->sr.suspended(); 2740 if (state == os::SuspendResume::SR_SUSPENDED) { 2741 sigset_t suspend_set; // signals for sigsuspend() 2742 2743 // get current set of blocked signals and unblock resume signal 2744 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2745 sigdelset(&suspend_set, SR_signum); 2746 2747 sr_semaphore.signal(); 2748 // wait here until we are resumed 2749 while (1) { 2750 sigsuspend(&suspend_set); 2751 2752 os::SuspendResume::State result = osthread->sr.running(); 2753 if (result == os::SuspendResume::SR_RUNNING) { 2754 sr_semaphore.signal(); 2755 break; 2756 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2757 ShouldNotReachHere(); 2758 } 2759 } 2760 2761 } else if (state == os::SuspendResume::SR_RUNNING) { 2762 // request was cancelled, continue 2763 } else { 2764 ShouldNotReachHere(); 2765 } 2766 2767 resume_clear_context(osthread); 2768 } else if (current == os::SuspendResume::SR_RUNNING) { 2769 // request was cancelled, continue 2770 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2771 // ignore 2772 } else { 2773 // ignore 2774 } 2775 2776 errno = old_errno; 2777 } 2778 2779 2780 static int SR_initialize() { 2781 struct sigaction act; 2782 char *s; 2783 // Get signal number to use for suspend/resume 2784 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2785 int sig = ::strtol(s, 0, 10); 2786 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2787 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2788 SR_signum = sig; 2789 } else { 2790 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2791 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2792 } 2793 } 2794 2795 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2796 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2797 2798 sigemptyset(&SR_sigset); 2799 sigaddset(&SR_sigset, SR_signum); 2800 2801 // Set up signal handler for suspend/resume 2802 act.sa_flags = SA_RESTART|SA_SIGINFO; 2803 act.sa_handler = (void (*)(int)) SR_handler; 2804 2805 // SR_signum is blocked by default. 2806 // 4528190 - We also need to block pthread restart signal (32 on all 2807 // supported Bsd platforms). Note that BsdThreads need to block 2808 // this signal for all threads to work properly. So we don't have 2809 // to use hard-coded signal number when setting up the mask. 2810 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2811 2812 if (sigaction(SR_signum, &act, 0) == -1) { 2813 return -1; 2814 } 2815 2816 // Save signal flag 2817 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2818 return 0; 2819 } 2820 2821 static int sr_notify(OSThread* osthread) { 2822 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2823 assert_status(status == 0, status, "pthread_kill"); 2824 return status; 2825 } 2826 2827 // "Randomly" selected value for how long we want to spin 2828 // before bailing out on suspending a thread, also how often 2829 // we send a signal to a thread we want to resume 2830 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2831 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2832 2833 // returns true on success and false on error - really an error is fatal 2834 // but this seems the normal response to library errors 2835 static bool do_suspend(OSThread* osthread) { 2836 assert(osthread->sr.is_running(), "thread should be running"); 2837 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2838 2839 // mark as suspended and send signal 2840 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2841 // failed to switch, state wasn't running? 2842 ShouldNotReachHere(); 2843 return false; 2844 } 2845 2846 if (sr_notify(osthread) != 0) { 2847 ShouldNotReachHere(); 2848 } 2849 2850 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2851 while (true) { 2852 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2853 break; 2854 } else { 2855 // timeout 2856 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2857 if (cancelled == os::SuspendResume::SR_RUNNING) { 2858 return false; 2859 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2860 // make sure that we consume the signal on the semaphore as well 2861 sr_semaphore.wait(); 2862 break; 2863 } else { 2864 ShouldNotReachHere(); 2865 return false; 2866 } 2867 } 2868 } 2869 2870 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2871 return true; 2872 } 2873 2874 static void do_resume(OSThread* osthread) { 2875 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2876 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2877 2878 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2879 // failed to switch to WAKEUP_REQUEST 2880 ShouldNotReachHere(); 2881 return; 2882 } 2883 2884 while (true) { 2885 if (sr_notify(osthread) == 0) { 2886 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2887 if (osthread->sr.is_running()) { 2888 return; 2889 } 2890 } 2891 } else { 2892 ShouldNotReachHere(); 2893 } 2894 } 2895 2896 guarantee(osthread->sr.is_running(), "Must be running!"); 2897 } 2898 2899 /////////////////////////////////////////////////////////////////////////////////// 2900 // signal handling (except suspend/resume) 2901 2902 // This routine may be used by user applications as a "hook" to catch signals. 2903 // The user-defined signal handler must pass unrecognized signals to this 2904 // routine, and if it returns true (non-zero), then the signal handler must 2905 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2906 // routine will never retun false (zero), but instead will execute a VM panic 2907 // routine kill the process. 2908 // 2909 // If this routine returns false, it is OK to call it again. This allows 2910 // the user-defined signal handler to perform checks either before or after 2911 // the VM performs its own checks. Naturally, the user code would be making 2912 // a serious error if it tried to handle an exception (such as a null check 2913 // or breakpoint) that the VM was generating for its own correct operation. 2914 // 2915 // This routine may recognize any of the following kinds of signals: 2916 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2917 // It should be consulted by handlers for any of those signals. 2918 // 2919 // The caller of this routine must pass in the three arguments supplied 2920 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2921 // field of the structure passed to sigaction(). This routine assumes that 2922 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2923 // 2924 // Note that the VM will print warnings if it detects conflicting signal 2925 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2926 // 2927 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2928 void* ucontext, 2929 int abort_if_unrecognized); 2930 2931 void signalHandler(int sig, siginfo_t* info, void* uc) { 2932 assert(info != NULL && uc != NULL, "it must be old kernel"); 2933 int orig_errno = errno; // Preserve errno value over signal handler. 2934 JVM_handle_bsd_signal(sig, info, uc, true); 2935 errno = orig_errno; 2936 } 2937 2938 2939 // This boolean allows users to forward their own non-matching signals 2940 // to JVM_handle_bsd_signal, harmlessly. 2941 bool os::Bsd::signal_handlers_are_installed = false; 2942 2943 // For signal-chaining 2944 struct sigaction sigact[NSIG]; 2945 uint32_t sigs = 0; 2946 #if (32 < NSIG-1) 2947 #error "Not all signals can be encoded in sigs. Adapt its type!" 2948 #endif 2949 bool os::Bsd::libjsig_is_loaded = false; 2950 typedef struct sigaction *(*get_signal_t)(int); 2951 get_signal_t os::Bsd::get_signal_action = NULL; 2952 2953 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2954 struct sigaction *actp = NULL; 2955 2956 if (libjsig_is_loaded) { 2957 // Retrieve the old signal handler from libjsig 2958 actp = (*get_signal_action)(sig); 2959 } 2960 if (actp == NULL) { 2961 // Retrieve the preinstalled signal handler from jvm 2962 actp = get_preinstalled_handler(sig); 2963 } 2964 2965 return actp; 2966 } 2967 2968 static bool call_chained_handler(struct sigaction *actp, int sig, 2969 siginfo_t *siginfo, void *context) { 2970 // Call the old signal handler 2971 if (actp->sa_handler == SIG_DFL) { 2972 // It's more reasonable to let jvm treat it as an unexpected exception 2973 // instead of taking the default action. 2974 return false; 2975 } else if (actp->sa_handler != SIG_IGN) { 2976 if ((actp->sa_flags & SA_NODEFER) == 0) { 2977 // automaticlly block the signal 2978 sigaddset(&(actp->sa_mask), sig); 2979 } 2980 2981 sa_handler_t hand; 2982 sa_sigaction_t sa; 2983 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2984 // retrieve the chained handler 2985 if (siginfo_flag_set) { 2986 sa = actp->sa_sigaction; 2987 } else { 2988 hand = actp->sa_handler; 2989 } 2990 2991 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2992 actp->sa_handler = SIG_DFL; 2993 } 2994 2995 // try to honor the signal mask 2996 sigset_t oset; 2997 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2998 2999 // call into the chained handler 3000 if (siginfo_flag_set) { 3001 (*sa)(sig, siginfo, context); 3002 } else { 3003 (*hand)(sig); 3004 } 3005 3006 // restore the signal mask 3007 pthread_sigmask(SIG_SETMASK, &oset, 0); 3008 } 3009 // Tell jvm's signal handler the signal is taken care of. 3010 return true; 3011 } 3012 3013 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3014 bool chained = false; 3015 // signal-chaining 3016 if (UseSignalChaining) { 3017 struct sigaction *actp = get_chained_signal_action(sig); 3018 if (actp != NULL) { 3019 chained = call_chained_handler(actp, sig, siginfo, context); 3020 } 3021 } 3022 return chained; 3023 } 3024 3025 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3026 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 3027 return &sigact[sig]; 3028 } 3029 return NULL; 3030 } 3031 3032 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3033 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3034 sigact[sig] = oldAct; 3035 sigs |= (uint32_t)1 << (sig-1); 3036 } 3037 3038 // for diagnostic 3039 int sigflags[NSIG]; 3040 3041 int os::Bsd::get_our_sigflags(int sig) { 3042 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3043 return sigflags[sig]; 3044 } 3045 3046 void os::Bsd::set_our_sigflags(int sig, int flags) { 3047 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3048 if (sig > 0 && sig < NSIG) { 3049 sigflags[sig] = flags; 3050 } 3051 } 3052 3053 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3054 // Check for overwrite. 3055 struct sigaction oldAct; 3056 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3057 3058 void* oldhand = oldAct.sa_sigaction 3059 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3060 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3061 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3062 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3063 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3064 if (AllowUserSignalHandlers || !set_installed) { 3065 // Do not overwrite; user takes responsibility to forward to us. 3066 return; 3067 } else if (UseSignalChaining) { 3068 // save the old handler in jvm 3069 save_preinstalled_handler(sig, oldAct); 3070 // libjsig also interposes the sigaction() call below and saves the 3071 // old sigaction on it own. 3072 } else { 3073 fatal("Encountered unexpected pre-existing sigaction handler " 3074 "%#lx for signal %d.", (long)oldhand, sig); 3075 } 3076 } 3077 3078 struct sigaction sigAct; 3079 sigfillset(&(sigAct.sa_mask)); 3080 sigAct.sa_handler = SIG_DFL; 3081 if (!set_installed) { 3082 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3083 } else { 3084 sigAct.sa_sigaction = signalHandler; 3085 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3086 } 3087 #ifdef __APPLE__ 3088 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3089 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3090 // if the signal handler declares it will handle it on alternate stack. 3091 // Notice we only declare we will handle it on alt stack, but we are not 3092 // actually going to use real alt stack - this is just a workaround. 3093 // Please see ux_exception.c, method catch_mach_exception_raise for details 3094 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3095 if (sig == SIGSEGV) { 3096 sigAct.sa_flags |= SA_ONSTACK; 3097 } 3098 #endif 3099 3100 // Save flags, which are set by ours 3101 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3102 sigflags[sig] = sigAct.sa_flags; 3103 3104 int ret = sigaction(sig, &sigAct, &oldAct); 3105 assert(ret == 0, "check"); 3106 3107 void* oldhand2 = oldAct.sa_sigaction 3108 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3109 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3110 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3111 } 3112 3113 // install signal handlers for signals that HotSpot needs to 3114 // handle in order to support Java-level exception handling. 3115 3116 void os::Bsd::install_signal_handlers() { 3117 if (!signal_handlers_are_installed) { 3118 signal_handlers_are_installed = true; 3119 3120 // signal-chaining 3121 typedef void (*signal_setting_t)(); 3122 signal_setting_t begin_signal_setting = NULL; 3123 signal_setting_t end_signal_setting = NULL; 3124 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3125 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3126 if (begin_signal_setting != NULL) { 3127 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3128 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3129 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3130 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3131 libjsig_is_loaded = true; 3132 assert(UseSignalChaining, "should enable signal-chaining"); 3133 } 3134 if (libjsig_is_loaded) { 3135 // Tell libjsig jvm is setting signal handlers 3136 (*begin_signal_setting)(); 3137 } 3138 3139 set_signal_handler(SIGSEGV, true); 3140 set_signal_handler(SIGPIPE, true); 3141 set_signal_handler(SIGBUS, true); 3142 set_signal_handler(SIGILL, true); 3143 set_signal_handler(SIGFPE, true); 3144 set_signal_handler(SIGXFSZ, true); 3145 3146 #if defined(__APPLE__) 3147 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3148 // signals caught and handled by the JVM. To work around this, we reset the mach task 3149 // signal handler that's placed on our process by CrashReporter. This disables 3150 // CrashReporter-based reporting. 3151 // 3152 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3153 // on caught fatal signals. 3154 // 3155 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3156 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3157 // exception handling, while leaving the standard BSD signal handlers functional. 3158 kern_return_t kr; 3159 kr = task_set_exception_ports(mach_task_self(), 3160 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3161 MACH_PORT_NULL, 3162 EXCEPTION_STATE_IDENTITY, 3163 MACHINE_THREAD_STATE); 3164 3165 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3166 #endif 3167 3168 if (libjsig_is_loaded) { 3169 // Tell libjsig jvm finishes setting signal handlers 3170 (*end_signal_setting)(); 3171 } 3172 3173 // We don't activate signal checker if libjsig is in place, we trust ourselves 3174 // and if UserSignalHandler is installed all bets are off 3175 if (CheckJNICalls) { 3176 if (libjsig_is_loaded) { 3177 if (PrintJNIResolving) { 3178 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3179 } 3180 check_signals = false; 3181 } 3182 if (AllowUserSignalHandlers) { 3183 if (PrintJNIResolving) { 3184 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3185 } 3186 check_signals = false; 3187 } 3188 } 3189 } 3190 } 3191 3192 3193 ///// 3194 // glibc on Bsd platform uses non-documented flag 3195 // to indicate, that some special sort of signal 3196 // trampoline is used. 3197 // We will never set this flag, and we should 3198 // ignore this flag in our diagnostic 3199 #ifdef SIGNIFICANT_SIGNAL_MASK 3200 #undef SIGNIFICANT_SIGNAL_MASK 3201 #endif 3202 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3203 3204 static const char* get_signal_handler_name(address handler, 3205 char* buf, int buflen) { 3206 int offset; 3207 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3208 if (found) { 3209 // skip directory names 3210 const char *p1, *p2; 3211 p1 = buf; 3212 size_t len = strlen(os::file_separator()); 3213 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3214 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3215 } else { 3216 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3217 } 3218 return buf; 3219 } 3220 3221 static void print_signal_handler(outputStream* st, int sig, 3222 char* buf, size_t buflen) { 3223 struct sigaction sa; 3224 3225 sigaction(sig, NULL, &sa); 3226 3227 // See comment for SIGNIFICANT_SIGNAL_MASK define 3228 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3229 3230 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3231 3232 address handler = (sa.sa_flags & SA_SIGINFO) 3233 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3234 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3235 3236 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3237 st->print("SIG_DFL"); 3238 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3239 st->print("SIG_IGN"); 3240 } else { 3241 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3242 } 3243 3244 st->print(", sa_mask[0]="); 3245 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3246 3247 address rh = VMError::get_resetted_sighandler(sig); 3248 // May be, handler was resetted by VMError? 3249 if (rh != NULL) { 3250 handler = rh; 3251 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3252 } 3253 3254 st->print(", sa_flags="); 3255 os::Posix::print_sa_flags(st, sa.sa_flags); 3256 3257 // Check: is it our handler? 3258 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3259 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3260 // It is our signal handler 3261 // check for flags, reset system-used one! 3262 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3263 st->print( 3264 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3265 os::Bsd::get_our_sigflags(sig)); 3266 } 3267 } 3268 st->cr(); 3269 } 3270 3271 3272 #define DO_SIGNAL_CHECK(sig) \ 3273 do { \ 3274 if (!sigismember(&check_signal_done, sig)) { \ 3275 os::Bsd::check_signal_handler(sig); \ 3276 } \ 3277 } while (0) 3278 3279 // This method is a periodic task to check for misbehaving JNI applications 3280 // under CheckJNI, we can add any periodic checks here 3281 3282 void os::run_periodic_checks() { 3283 3284 if (check_signals == false) return; 3285 3286 // SEGV and BUS if overridden could potentially prevent 3287 // generation of hs*.log in the event of a crash, debugging 3288 // such a case can be very challenging, so we absolutely 3289 // check the following for a good measure: 3290 DO_SIGNAL_CHECK(SIGSEGV); 3291 DO_SIGNAL_CHECK(SIGILL); 3292 DO_SIGNAL_CHECK(SIGFPE); 3293 DO_SIGNAL_CHECK(SIGBUS); 3294 DO_SIGNAL_CHECK(SIGPIPE); 3295 DO_SIGNAL_CHECK(SIGXFSZ); 3296 3297 3298 // ReduceSignalUsage allows the user to override these handlers 3299 // see comments at the very top and jvm_solaris.h 3300 if (!ReduceSignalUsage) { 3301 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3302 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3303 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3304 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3305 } 3306 3307 DO_SIGNAL_CHECK(SR_signum); 3308 } 3309 3310 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3311 3312 static os_sigaction_t os_sigaction = NULL; 3313 3314 void os::Bsd::check_signal_handler(int sig) { 3315 char buf[O_BUFLEN]; 3316 address jvmHandler = NULL; 3317 3318 3319 struct sigaction act; 3320 if (os_sigaction == NULL) { 3321 // only trust the default sigaction, in case it has been interposed 3322 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3323 if (os_sigaction == NULL) return; 3324 } 3325 3326 os_sigaction(sig, (struct sigaction*)NULL, &act); 3327 3328 3329 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3330 3331 address thisHandler = (act.sa_flags & SA_SIGINFO) 3332 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3333 : CAST_FROM_FN_PTR(address, act.sa_handler); 3334 3335 3336 switch (sig) { 3337 case SIGSEGV: 3338 case SIGBUS: 3339 case SIGFPE: 3340 case SIGPIPE: 3341 case SIGILL: 3342 case SIGXFSZ: 3343 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3344 break; 3345 3346 case SHUTDOWN1_SIGNAL: 3347 case SHUTDOWN2_SIGNAL: 3348 case SHUTDOWN3_SIGNAL: 3349 case BREAK_SIGNAL: 3350 jvmHandler = (address)user_handler(); 3351 break; 3352 3353 default: 3354 if (sig == SR_signum) { 3355 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3356 } else { 3357 return; 3358 } 3359 break; 3360 } 3361 3362 if (thisHandler != jvmHandler) { 3363 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3364 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3365 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3366 // No need to check this sig any longer 3367 sigaddset(&check_signal_done, sig); 3368 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3369 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3370 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3371 exception_name(sig, buf, O_BUFLEN)); 3372 } 3373 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3374 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3375 tty->print("expected:"); 3376 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3377 tty->cr(); 3378 tty->print(" found:"); 3379 os::Posix::print_sa_flags(tty, act.sa_flags); 3380 tty->cr(); 3381 // No need to check this sig any longer 3382 sigaddset(&check_signal_done, sig); 3383 } 3384 3385 // Dump all the signal 3386 if (sigismember(&check_signal_done, sig)) { 3387 print_signal_handlers(tty, buf, O_BUFLEN); 3388 } 3389 } 3390 3391 extern void report_error(char* file_name, int line_no, char* title, 3392 char* format, ...); 3393 3394 // this is called _before_ the most of global arguments have been parsed 3395 void os::init(void) { 3396 char dummy; // used to get a guess on initial stack address 3397 3398 // With BsdThreads the JavaMain thread pid (primordial thread) 3399 // is different than the pid of the java launcher thread. 3400 // So, on Bsd, the launcher thread pid is passed to the VM 3401 // via the sun.java.launcher.pid property. 3402 // Use this property instead of getpid() if it was correctly passed. 3403 // See bug 6351349. 3404 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3405 3406 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3407 3408 clock_tics_per_sec = CLK_TCK; 3409 3410 init_random(1234567); 3411 3412 ThreadCritical::initialize(); 3413 3414 Bsd::set_page_size(getpagesize()); 3415 if (Bsd::page_size() == -1) { 3416 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3417 } 3418 init_page_sizes((size_t) Bsd::page_size()); 3419 3420 Bsd::initialize_system_info(); 3421 3422 // main_thread points to the aboriginal thread 3423 Bsd::_main_thread = pthread_self(); 3424 3425 Bsd::clock_init(); 3426 initial_time_count = javaTimeNanos(); 3427 3428 #ifdef __APPLE__ 3429 // XXXDARWIN 3430 // Work around the unaligned VM callbacks in hotspot's 3431 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3432 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3433 // alignment when doing symbol lookup. To work around this, we force early 3434 // binding of all symbols now, thus binding when alignment is known-good. 3435 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3436 #endif 3437 3438 os::Posix::init(); 3439 } 3440 3441 // To install functions for atexit system call 3442 extern "C" { 3443 static void perfMemory_exit_helper() { 3444 perfMemory_exit(); 3445 } 3446 } 3447 3448 // this is called _after_ the global arguments have been parsed 3449 jint os::init_2(void) { 3450 3451 os::Posix::init_2(); 3452 3453 // Allocate a single page and mark it as readable for safepoint polling 3454 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3455 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page"); 3456 3457 os::set_polling_page(polling_page); 3458 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 3459 3460 if (!UseMembar) { 3461 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3462 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3463 os::set_memory_serialize_page(mem_serialize_page); 3464 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 3465 } 3466 3467 // initialize suspend/resume support - must do this before signal_sets_init() 3468 if (SR_initialize() != 0) { 3469 perror("SR_initialize failed"); 3470 return JNI_ERR; 3471 } 3472 3473 Bsd::signal_sets_init(); 3474 Bsd::install_signal_handlers(); 3475 3476 // Check and sets minimum stack sizes against command line options 3477 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3478 return JNI_ERR; 3479 } 3480 3481 if (MaxFDLimit) { 3482 // set the number of file descriptors to max. print out error 3483 // if getrlimit/setrlimit fails but continue regardless. 3484 struct rlimit nbr_files; 3485 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3486 if (status != 0) { 3487 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3488 } else { 3489 nbr_files.rlim_cur = nbr_files.rlim_max; 3490 3491 #ifdef __APPLE__ 3492 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3493 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3494 // be used instead 3495 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3496 #endif 3497 3498 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3499 if (status != 0) { 3500 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3501 } 3502 } 3503 } 3504 3505 // at-exit methods are called in the reverse order of their registration. 3506 // atexit functions are called on return from main or as a result of a 3507 // call to exit(3C). There can be only 32 of these functions registered 3508 // and atexit() does not set errno. 3509 3510 if (PerfAllowAtExitRegistration) { 3511 // only register atexit functions if PerfAllowAtExitRegistration is set. 3512 // atexit functions can be delayed until process exit time, which 3513 // can be problematic for embedded VM situations. Embedded VMs should 3514 // call DestroyJavaVM() to assure that VM resources are released. 3515 3516 // note: perfMemory_exit_helper atexit function may be removed in 3517 // the future if the appropriate cleanup code can be added to the 3518 // VM_Exit VMOperation's doit method. 3519 if (atexit(perfMemory_exit_helper) != 0) { 3520 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3521 } 3522 } 3523 3524 // initialize thread priority policy 3525 prio_init(); 3526 3527 #ifdef __APPLE__ 3528 // dynamically link to objective c gc registration 3529 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3530 if (handleLibObjc != NULL) { 3531 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3532 } 3533 #endif 3534 3535 return JNI_OK; 3536 } 3537 3538 // Mark the polling page as unreadable 3539 void os::make_polling_page_unreadable(void) { 3540 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3541 fatal("Could not disable polling page"); 3542 } 3543 } 3544 3545 // Mark the polling page as readable 3546 void os::make_polling_page_readable(void) { 3547 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3548 fatal("Could not enable polling page"); 3549 } 3550 } 3551 3552 int os::active_processor_count() { 3553 return _processor_count; 3554 } 3555 3556 void os::set_native_thread_name(const char *name) { 3557 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3558 // This is only supported in Snow Leopard and beyond 3559 if (name != NULL) { 3560 // Add a "Java: " prefix to the name 3561 char buf[MAXTHREADNAMESIZE]; 3562 snprintf(buf, sizeof(buf), "Java: %s", name); 3563 pthread_setname_np(buf); 3564 } 3565 #endif 3566 } 3567 3568 bool os::distribute_processes(uint length, uint* distribution) { 3569 // Not yet implemented. 3570 return false; 3571 } 3572 3573 bool os::bind_to_processor(uint processor_id) { 3574 // Not yet implemented. 3575 return false; 3576 } 3577 3578 void os::SuspendedThreadTask::internal_do_task() { 3579 if (do_suspend(_thread->osthread())) { 3580 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3581 do_task(context); 3582 do_resume(_thread->osthread()); 3583 } 3584 } 3585 3586 /// 3587 class PcFetcher : public os::SuspendedThreadTask { 3588 public: 3589 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3590 ExtendedPC result(); 3591 protected: 3592 void do_task(const os::SuspendedThreadTaskContext& context); 3593 private: 3594 ExtendedPC _epc; 3595 }; 3596 3597 ExtendedPC PcFetcher::result() { 3598 guarantee(is_done(), "task is not done yet."); 3599 return _epc; 3600 } 3601 3602 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3603 Thread* thread = context.thread(); 3604 OSThread* osthread = thread->osthread(); 3605 if (osthread->ucontext() != NULL) { 3606 _epc = os::Bsd::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3607 } else { 3608 // NULL context is unexpected, double-check this is the VMThread 3609 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3610 } 3611 } 3612 3613 // Suspends the target using the signal mechanism and then grabs the PC before 3614 // resuming the target. Used by the flat-profiler only 3615 ExtendedPC os::get_thread_pc(Thread* thread) { 3616 // Make sure that it is called by the watcher for the VMThread 3617 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3618 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3619 3620 PcFetcher fetcher(thread); 3621 fetcher.run(); 3622 return fetcher.result(); 3623 } 3624 3625 //////////////////////////////////////////////////////////////////////////////// 3626 // debug support 3627 3628 bool os::find(address addr, outputStream* st) { 3629 Dl_info dlinfo; 3630 memset(&dlinfo, 0, sizeof(dlinfo)); 3631 if (dladdr(addr, &dlinfo) != 0) { 3632 st->print(PTR_FORMAT ": ", addr); 3633 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3634 st->print("%s+%#x", dlinfo.dli_sname, 3635 addr - (intptr_t)dlinfo.dli_saddr); 3636 } else if (dlinfo.dli_fbase != NULL) { 3637 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3638 } else { 3639 st->print("<absolute address>"); 3640 } 3641 if (dlinfo.dli_fname != NULL) { 3642 st->print(" in %s", dlinfo.dli_fname); 3643 } 3644 if (dlinfo.dli_fbase != NULL) { 3645 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3646 } 3647 st->cr(); 3648 3649 if (Verbose) { 3650 // decode some bytes around the PC 3651 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3652 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3653 address lowest = (address) dlinfo.dli_sname; 3654 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3655 if (begin < lowest) begin = lowest; 3656 Dl_info dlinfo2; 3657 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3658 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3659 end = (address) dlinfo2.dli_saddr; 3660 } 3661 Disassembler::decode(begin, end, st); 3662 } 3663 return true; 3664 } 3665 return false; 3666 } 3667 3668 //////////////////////////////////////////////////////////////////////////////// 3669 // misc 3670 3671 // This does not do anything on Bsd. This is basically a hook for being 3672 // able to use structured exception handling (thread-local exception filters) 3673 // on, e.g., Win32. 3674 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3675 const methodHandle& method, JavaCallArguments* args, 3676 Thread* thread) { 3677 f(value, method, args, thread); 3678 } 3679 3680 void os::print_statistics() { 3681 } 3682 3683 bool os::message_box(const char* title, const char* message) { 3684 int i; 3685 fdStream err(defaultStream::error_fd()); 3686 for (i = 0; i < 78; i++) err.print_raw("="); 3687 err.cr(); 3688 err.print_raw_cr(title); 3689 for (i = 0; i < 78; i++) err.print_raw("-"); 3690 err.cr(); 3691 err.print_raw_cr(message); 3692 for (i = 0; i < 78; i++) err.print_raw("="); 3693 err.cr(); 3694 3695 char buf[16]; 3696 // Prevent process from exiting upon "read error" without consuming all CPU 3697 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3698 3699 return buf[0] == 'y' || buf[0] == 'Y'; 3700 } 3701 3702 int os::stat(const char *path, struct stat *sbuf) { 3703 char pathbuf[MAX_PATH]; 3704 if (strlen(path) > MAX_PATH - 1) { 3705 errno = ENAMETOOLONG; 3706 return -1; 3707 } 3708 os::native_path(strcpy(pathbuf, path)); 3709 return ::stat(pathbuf, sbuf); 3710 } 3711 3712 static inline struct timespec get_mtime(const char* filename) { 3713 struct stat st; 3714 int ret = os::stat(filename, &st); 3715 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3716 #ifdef __APPLE__ 3717 return st.st_mtimespec; 3718 #else 3719 return st.st_mtim; 3720 #endif 3721 } 3722 3723 int os::compare_file_modified_times(const char* file1, const char* file2) { 3724 struct timespec filetime1 = get_mtime(file1); 3725 struct timespec filetime2 = get_mtime(file2); 3726 int diff = filetime1.tv_sec - filetime2.tv_sec; 3727 if (diff == 0) { 3728 return filetime1.tv_nsec - filetime2.tv_nsec; 3729 } 3730 return diff; 3731 } 3732 3733 // Is a (classpath) directory empty? 3734 bool os::dir_is_empty(const char* path) { 3735 DIR *dir = NULL; 3736 struct dirent *ptr; 3737 3738 dir = opendir(path); 3739 if (dir == NULL) return true; 3740 3741 // Scan the directory 3742 bool result = true; 3743 char buf[sizeof(struct dirent) + MAX_PATH]; 3744 while (result && (ptr = ::readdir(dir)) != NULL) { 3745 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3746 result = false; 3747 } 3748 } 3749 closedir(dir); 3750 return result; 3751 } 3752 3753 // This code originates from JDK's sysOpen and open64_w 3754 // from src/solaris/hpi/src/system_md.c 3755 3756 int os::open(const char *path, int oflag, int mode) { 3757 if (strlen(path) > MAX_PATH - 1) { 3758 errno = ENAMETOOLONG; 3759 return -1; 3760 } 3761 int fd; 3762 3763 fd = ::open(path, oflag, mode); 3764 if (fd == -1) return -1; 3765 3766 // If the open succeeded, the file might still be a directory 3767 { 3768 struct stat buf; 3769 int ret = ::fstat(fd, &buf); 3770 int st_mode = buf.st_mode; 3771 3772 if (ret != -1) { 3773 if ((st_mode & S_IFMT) == S_IFDIR) { 3774 errno = EISDIR; 3775 ::close(fd); 3776 return -1; 3777 } 3778 } else { 3779 ::close(fd); 3780 return -1; 3781 } 3782 } 3783 3784 // All file descriptors that are opened in the JVM and not 3785 // specifically destined for a subprocess should have the 3786 // close-on-exec flag set. If we don't set it, then careless 3rd 3787 // party native code might fork and exec without closing all 3788 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3789 // UNIXProcess.c), and this in turn might: 3790 // 3791 // - cause end-of-file to fail to be detected on some file 3792 // descriptors, resulting in mysterious hangs, or 3793 // 3794 // - might cause an fopen in the subprocess to fail on a system 3795 // suffering from bug 1085341. 3796 // 3797 // (Yes, the default setting of the close-on-exec flag is a Unix 3798 // design flaw) 3799 // 3800 // See: 3801 // 1085341: 32-bit stdio routines should support file descriptors >255 3802 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3803 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3804 // 3805 #ifdef FD_CLOEXEC 3806 { 3807 int flags = ::fcntl(fd, F_GETFD); 3808 if (flags != -1) { 3809 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3810 } 3811 } 3812 #endif 3813 3814 return fd; 3815 } 3816 3817 3818 // create binary file, rewriting existing file if required 3819 int os::create_binary_file(const char* path, bool rewrite_existing) { 3820 int oflags = O_WRONLY | O_CREAT; 3821 if (!rewrite_existing) { 3822 oflags |= O_EXCL; 3823 } 3824 return ::open(path, oflags, S_IREAD | S_IWRITE); 3825 } 3826 3827 // return current position of file pointer 3828 jlong os::current_file_offset(int fd) { 3829 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3830 } 3831 3832 // move file pointer to the specified offset 3833 jlong os::seek_to_file_offset(int fd, jlong offset) { 3834 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3835 } 3836 3837 // This code originates from JDK's sysAvailable 3838 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3839 3840 int os::available(int fd, jlong *bytes) { 3841 jlong cur, end; 3842 int mode; 3843 struct stat buf; 3844 3845 if (::fstat(fd, &buf) >= 0) { 3846 mode = buf.st_mode; 3847 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3848 int n; 3849 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3850 *bytes = n; 3851 return 1; 3852 } 3853 } 3854 } 3855 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3856 return 0; 3857 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3858 return 0; 3859 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3860 return 0; 3861 } 3862 *bytes = end - cur; 3863 return 1; 3864 } 3865 3866 // Map a block of memory. 3867 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3868 char *addr, size_t bytes, bool read_only, 3869 bool allow_exec) { 3870 int prot; 3871 int flags; 3872 3873 if (read_only) { 3874 prot = PROT_READ; 3875 flags = MAP_SHARED; 3876 } else { 3877 prot = PROT_READ | PROT_WRITE; 3878 flags = MAP_PRIVATE; 3879 } 3880 3881 if (allow_exec) { 3882 prot |= PROT_EXEC; 3883 } 3884 3885 if (addr != NULL) { 3886 flags |= MAP_FIXED; 3887 } 3888 3889 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3890 fd, file_offset); 3891 if (mapped_address == MAP_FAILED) { 3892 return NULL; 3893 } 3894 return mapped_address; 3895 } 3896 3897 3898 // Remap a block of memory. 3899 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3900 char *addr, size_t bytes, bool read_only, 3901 bool allow_exec) { 3902 // same as map_memory() on this OS 3903 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3904 allow_exec); 3905 } 3906 3907 3908 // Unmap a block of memory. 3909 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3910 return munmap(addr, bytes) == 0; 3911 } 3912 3913 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3914 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3915 // of a thread. 3916 // 3917 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3918 // the fast estimate available on the platform. 3919 3920 jlong os::current_thread_cpu_time() { 3921 #ifdef __APPLE__ 3922 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3923 #else 3924 Unimplemented(); 3925 return 0; 3926 #endif 3927 } 3928 3929 jlong os::thread_cpu_time(Thread* thread) { 3930 #ifdef __APPLE__ 3931 return os::thread_cpu_time(thread, true /* user + sys */); 3932 #else 3933 Unimplemented(); 3934 return 0; 3935 #endif 3936 } 3937 3938 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3939 #ifdef __APPLE__ 3940 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3941 #else 3942 Unimplemented(); 3943 return 0; 3944 #endif 3945 } 3946 3947 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3948 #ifdef __APPLE__ 3949 struct thread_basic_info tinfo; 3950 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3951 kern_return_t kr; 3952 thread_t mach_thread; 3953 3954 mach_thread = thread->osthread()->thread_id(); 3955 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3956 if (kr != KERN_SUCCESS) { 3957 return -1; 3958 } 3959 3960 if (user_sys_cpu_time) { 3961 jlong nanos; 3962 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3963 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3964 return nanos; 3965 } else { 3966 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3967 } 3968 #else 3969 Unimplemented(); 3970 return 0; 3971 #endif 3972 } 3973 3974 3975 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3976 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3977 info_ptr->may_skip_backward = false; // elapsed time not wall time 3978 info_ptr->may_skip_forward = false; // elapsed time not wall time 3979 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3980 } 3981 3982 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3983 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3984 info_ptr->may_skip_backward = false; // elapsed time not wall time 3985 info_ptr->may_skip_forward = false; // elapsed time not wall time 3986 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3987 } 3988 3989 bool os::is_thread_cpu_time_supported() { 3990 #ifdef __APPLE__ 3991 return true; 3992 #else 3993 return false; 3994 #endif 3995 } 3996 3997 // System loadavg support. Returns -1 if load average cannot be obtained. 3998 // Bsd doesn't yet have a (official) notion of processor sets, 3999 // so just return the system wide load average. 4000 int os::loadavg(double loadavg[], int nelem) { 4001 return ::getloadavg(loadavg, nelem); 4002 } 4003 4004 void os::pause() { 4005 char filename[MAX_PATH]; 4006 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4007 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4008 } else { 4009 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4010 } 4011 4012 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4013 if (fd != -1) { 4014 struct stat buf; 4015 ::close(fd); 4016 while (::stat(filename, &buf) == 0) { 4017 (void)::poll(NULL, 0, 100); 4018 } 4019 } else { 4020 jio_fprintf(stderr, 4021 "Could not open pause file '%s', continuing immediately.\n", filename); 4022 } 4023 } 4024 4025 // Darwin has no "environ" in a dynamic library. 4026 #ifdef __APPLE__ 4027 #include <crt_externs.h> 4028 #define environ (*_NSGetEnviron()) 4029 #else 4030 extern char** environ; 4031 #endif 4032 4033 // Run the specified command in a separate process. Return its exit value, 4034 // or -1 on failure (e.g. can't fork a new process). 4035 // Unlike system(), this function can be called from signal handler. It 4036 // doesn't block SIGINT et al. 4037 int os::fork_and_exec(char* cmd) { 4038 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4039 4040 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4041 // pthread_atfork handlers and reset pthread library. All we need is a 4042 // separate process to execve. Make a direct syscall to fork process. 4043 // On IA64 there's no fork syscall, we have to use fork() and hope for 4044 // the best... 4045 pid_t pid = fork(); 4046 4047 if (pid < 0) { 4048 // fork failed 4049 return -1; 4050 4051 } else if (pid == 0) { 4052 // child process 4053 4054 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4055 // first to kill every thread on the thread list. Because this list is 4056 // not reset by fork() (see notes above), execve() will instead kill 4057 // every thread in the parent process. We know this is the only thread 4058 // in the new process, so make a system call directly. 4059 // IA64 should use normal execve() from glibc to match the glibc fork() 4060 // above. 4061 execve("/bin/sh", (char* const*)argv, environ); 4062 4063 // execve failed 4064 _exit(-1); 4065 4066 } else { 4067 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4068 // care about the actual exit code, for now. 4069 4070 int status; 4071 4072 // Wait for the child process to exit. This returns immediately if 4073 // the child has already exited. */ 4074 while (waitpid(pid, &status, 0) < 0) { 4075 switch (errno) { 4076 case ECHILD: return 0; 4077 case EINTR: break; 4078 default: return -1; 4079 } 4080 } 4081 4082 if (WIFEXITED(status)) { 4083 // The child exited normally; get its exit code. 4084 return WEXITSTATUS(status); 4085 } else if (WIFSIGNALED(status)) { 4086 // The child exited because of a signal 4087 // The best value to return is 0x80 + signal number, 4088 // because that is what all Unix shells do, and because 4089 // it allows callers to distinguish between process exit and 4090 // process death by signal. 4091 return 0x80 + WTERMSIG(status); 4092 } else { 4093 // Unknown exit code; pass it through 4094 return status; 4095 } 4096 } 4097 } 4098 4099 // is_headless_jre() 4100 // 4101 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4102 // in order to report if we are running in a headless jre 4103 // 4104 // Since JDK8 xawt/libmawt.so was moved into the same directory 4105 // as libawt.so, and renamed libawt_xawt.so 4106 // 4107 bool os::is_headless_jre() { 4108 #ifdef __APPLE__ 4109 // We no longer build headless-only on Mac OS X 4110 return false; 4111 #else 4112 struct stat statbuf; 4113 char buf[MAXPATHLEN]; 4114 char libmawtpath[MAXPATHLEN]; 4115 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4116 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4117 char *p; 4118 4119 // Get path to libjvm.so 4120 os::jvm_path(buf, sizeof(buf)); 4121 4122 // Get rid of libjvm.so 4123 p = strrchr(buf, '/'); 4124 if (p == NULL) { 4125 return false; 4126 } else { 4127 *p = '\0'; 4128 } 4129 4130 // Get rid of client or server 4131 p = strrchr(buf, '/'); 4132 if (p == NULL) { 4133 return false; 4134 } else { 4135 *p = '\0'; 4136 } 4137 4138 // check xawt/libmawt.so 4139 strcpy(libmawtpath, buf); 4140 strcat(libmawtpath, xawtstr); 4141 if (::stat(libmawtpath, &statbuf) == 0) return false; 4142 4143 // check libawt_xawt.so 4144 strcpy(libmawtpath, buf); 4145 strcat(libmawtpath, new_xawtstr); 4146 if (::stat(libmawtpath, &statbuf) == 0) return false; 4147 4148 return true; 4149 #endif 4150 } 4151 4152 // Get the default path to the core file 4153 // Returns the length of the string 4154 int os::get_core_path(char* buffer, size_t bufferSize) { 4155 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 4156 4157 // Truncate if theoretical string was longer than bufferSize 4158 n = MIN2(n, (int)bufferSize); 4159 4160 return n; 4161 } 4162 4163 #ifndef PRODUCT 4164 void TestReserveMemorySpecial_test() { 4165 // No tests available for this platform 4166 } 4167 #endif 4168 4169 bool os::start_debugging(char *buf, int buflen) { 4170 int len = (int)strlen(buf); 4171 char *p = &buf[len]; 4172 4173 jio_snprintf(p, buflen-len, 4174 "\n\n" 4175 "Do you want to debug the problem?\n\n" 4176 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 4177 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 4178 "Otherwise, press RETURN to abort...", 4179 os::current_process_id(), os::current_process_id(), 4180 os::current_thread_id(), os::current_thread_id()); 4181 4182 bool yes = os::message_box("Unexpected Error", buf); 4183 4184 if (yes) { 4185 // yes, user asked VM to launch debugger 4186 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 4187 os::current_process_id(), os::current_process_id()); 4188 4189 os::fork_and_exec(buf); 4190 yes = false; 4191 } 4192 return yes; 4193 }