1 /* 2 * Copyright (c) 1999, 2012, 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 "interpreter/interpreter.hpp" 33 #include "jvm_bsd.h" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/filemap.hpp" 36 #include "mutex_bsd.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "os_share_bsd.hpp" 39 #include "prims/jniFastGetField.hpp" 40 #include "prims/jvm.h" 41 #include "prims/jvm_misc.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/extendedPC.hpp" 44 #include "runtime/globals.hpp" 45 #include "runtime/interfaceSupport.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/javaCalls.hpp" 48 #include "runtime/mutexLocker.hpp" 49 #include "runtime/objectMonitor.hpp" 50 #include "runtime/osThread.hpp" 51 #include "runtime/perfMemory.hpp" 52 #include "runtime/sharedRuntime.hpp" 53 #include "runtime/statSampler.hpp" 54 #include "runtime/stubRoutines.hpp" 55 #include "runtime/threadCritical.hpp" 56 #include "runtime/timer.hpp" 57 #include "services/attachListener.hpp" 58 #include "services/runtimeService.hpp" 59 #include "thread_bsd.inline.hpp" 60 #include "utilities/decoder.hpp" 61 #include "utilities/defaultStream.hpp" 62 #include "utilities/events.hpp" 63 #include "utilities/growableArray.hpp" 64 #include "utilities/vmError.hpp" 65 #ifdef TARGET_ARCH_x86 66 # include "assembler_x86.inline.hpp" 67 # include "nativeInst_x86.hpp" 68 #endif 69 #ifdef TARGET_ARCH_sparc 70 # include "assembler_sparc.inline.hpp" 71 # include "nativeInst_sparc.hpp" 72 #endif 73 #ifdef TARGET_ARCH_zero 74 # include "assembler_zero.inline.hpp" 75 # include "nativeInst_zero.hpp" 76 #endif 77 #ifdef TARGET_ARCH_arm 78 # include "assembler_arm.inline.hpp" 79 # include "nativeInst_arm.hpp" 80 #endif 81 #ifdef TARGET_ARCH_ppc 82 # include "assembler_ppc.inline.hpp" 83 # include "nativeInst_ppc.hpp" 84 #endif 85 86 // put OS-includes here 87 # include <sys/types.h> 88 # include <sys/mman.h> 89 # include <sys/stat.h> 90 # include <sys/select.h> 91 # include <pthread.h> 92 # include <signal.h> 93 # include <errno.h> 94 # include <dlfcn.h> 95 # include <stdio.h> 96 # include <unistd.h> 97 # include <sys/resource.h> 98 # include <pthread.h> 99 # include <sys/stat.h> 100 # include <sys/time.h> 101 # include <sys/times.h> 102 # include <sys/utsname.h> 103 # include <sys/socket.h> 104 # include <sys/wait.h> 105 # include <time.h> 106 # include <pwd.h> 107 # include <poll.h> 108 # include <semaphore.h> 109 # include <fcntl.h> 110 # include <string.h> 111 # include <sys/param.h> 112 # include <sys/sysctl.h> 113 # include <sys/ipc.h> 114 # include <sys/shm.h> 115 #ifndef __APPLE__ 116 # include <link.h> 117 #endif 118 # include <stdint.h> 119 # include <inttypes.h> 120 # include <sys/ioctl.h> 121 122 #if defined(__FreeBSD__) || defined(__NetBSD__) 123 # include <elf.h> 124 #endif 125 126 #ifdef __APPLE__ 127 # include <mach/mach.h> // semaphore_* API 128 # include <mach-o/dyld.h> 129 # include <sys/proc_info.h> 130 # include <objc/objc-auto.h> 131 #endif 132 133 #ifndef MAP_ANONYMOUS 134 #define MAP_ANONYMOUS MAP_ANON 135 #endif 136 137 #define MAX_PATH (2 * K) 138 139 // for timer info max values which include all bits 140 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 141 142 #define LARGEPAGES_BIT (1 << 6) 143 //////////////////////////////////////////////////////////////////////////////// 144 // global variables 145 julong os::Bsd::_physical_memory = 0; 146 147 148 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 149 pthread_t os::Bsd::_main_thread; 150 int os::Bsd::_page_size = -1; 151 152 static jlong initial_time_count=0; 153 154 static int clock_tics_per_sec = 100; 155 156 // For diagnostics to print a message once. see run_periodic_checks 157 static sigset_t check_signal_done; 158 static bool check_signals = true; 159 160 static pid_t _initial_pid = 0; 161 162 /* Signal number used to suspend/resume a thread */ 163 164 /* do not use any signal number less than SIGSEGV, see 4355769 */ 165 static int SR_signum = SIGUSR2; 166 sigset_t SR_sigset; 167 168 169 //////////////////////////////////////////////////////////////////////////////// 170 // utility functions 171 172 static int SR_initialize(); 173 static int SR_finalize(); 174 175 julong os::available_memory() { 176 return Bsd::available_memory(); 177 } 178 179 julong os::Bsd::available_memory() { 180 // XXXBSD: this is just a stopgap implementation 181 return physical_memory() >> 2; 182 } 183 184 julong os::physical_memory() { 185 return Bsd::physical_memory(); 186 } 187 188 julong os::allocatable_physical_memory(julong size) { 189 #ifdef _LP64 190 return size; 191 #else 192 julong result = MIN2(size, (julong)3800*M); 193 if (!is_allocatable(result)) { 194 // See comments under solaris for alignment considerations 195 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); 196 result = MIN2(size, reasonable_size); 197 } 198 return result; 199 #endif // _LP64 200 } 201 202 //////////////////////////////////////////////////////////////////////////////// 203 // environment support 204 205 bool os::getenv(const char* name, char* buf, int len) { 206 const char* val = ::getenv(name); 207 if (val != NULL && strlen(val) < (size_t)len) { 208 strcpy(buf, val); 209 return true; 210 } 211 if (len > 0) buf[0] = 0; // return a null string 212 return false; 213 } 214 215 216 // Return true if user is running as root. 217 218 bool os::have_special_privileges() { 219 static bool init = false; 220 static bool privileges = false; 221 if (!init) { 222 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 223 init = true; 224 } 225 return privileges; 226 } 227 228 229 230 // Cpu architecture string 231 #if defined(ZERO) 232 static char cpu_arch[] = ZERO_LIBARCH; 233 #elif defined(IA64) 234 static char cpu_arch[] = "ia64"; 235 #elif defined(IA32) 236 static char cpu_arch[] = "i386"; 237 #elif defined(AMD64) 238 static char cpu_arch[] = "amd64"; 239 #elif defined(ARM) 240 static char cpu_arch[] = "arm"; 241 #elif defined(PPC) 242 static char cpu_arch[] = "ppc"; 243 #elif defined(SPARC) 244 # ifdef _LP64 245 static char cpu_arch[] = "sparcv9"; 246 # else 247 static char cpu_arch[] = "sparc"; 248 # endif 249 #else 250 #error Add appropriate cpu_arch setting 251 #endif 252 253 // Compiler variant 254 #ifdef COMPILER2 255 #define COMPILER_VARIANT "server" 256 #else 257 #define COMPILER_VARIANT "client" 258 #endif 259 260 261 void os::Bsd::initialize_system_info() { 262 int mib[2]; 263 size_t len; 264 int cpu_val; 265 u_long mem_val; 266 267 /* get processors count via hw.ncpus sysctl */ 268 mib[0] = CTL_HW; 269 mib[1] = HW_NCPU; 270 len = sizeof(cpu_val); 271 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 272 set_processor_count(cpu_val); 273 } 274 else { 275 set_processor_count(1); // fallback 276 } 277 278 /* get physical memory via hw.usermem sysctl (hw.usermem is used 279 * instead of hw.physmem because we need size of allocatable memory 280 */ 281 mib[0] = CTL_HW; 282 mib[1] = HW_USERMEM; 283 len = sizeof(mem_val); 284 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) 285 _physical_memory = mem_val; 286 else 287 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 288 289 #ifdef __OpenBSD__ 290 { 291 // limit _physical_memory memory view on OpenBSD since 292 // datasize rlimit restricts us anyway. 293 struct rlimit limits; 294 getrlimit(RLIMIT_DATA, &limits); 295 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 296 } 297 #endif 298 } 299 300 #ifdef __APPLE__ 301 static const char *get_home() { 302 const char *home_dir = ::getenv("HOME"); 303 if ((home_dir == NULL) || (*home_dir == '\0')) { 304 struct passwd *passwd_info = getpwuid(geteuid()); 305 if (passwd_info != NULL) { 306 home_dir = passwd_info->pw_dir; 307 } 308 } 309 310 return home_dir; 311 } 312 #endif 313 314 void os::init_system_properties_values() { 315 // char arch[12]; 316 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 317 318 // The next steps are taken in the product version: 319 // 320 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. 321 // This library should be located at: 322 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. 323 // 324 // If "/jre/lib/" appears at the right place in the path, then we 325 // assume libjvm[_g].so is installed in a JDK and we use this path. 326 // 327 // Otherwise exit with message: "Could not create the Java virtual machine." 328 // 329 // The following extra steps are taken in the debugging version: 330 // 331 // If "/jre/lib/" does NOT appear at the right place in the path 332 // instead of exit check for $JAVA_HOME environment variable. 333 // 334 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 335 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so 336 // it looks like libjvm[_g].so is installed there 337 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. 338 // 339 // Otherwise exit. 340 // 341 // Important note: if the location of libjvm.so changes this 342 // code needs to be changed accordingly. 343 344 // The next few definitions allow the code to be verbatim: 345 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 346 #define getenv(n) ::getenv(n) 347 348 /* 349 * See ld(1): 350 * The linker uses the following search paths to locate required 351 * shared libraries: 352 * 1: ... 353 * ... 354 * 7: The default directories, normally /lib and /usr/lib. 355 */ 356 #ifndef DEFAULT_LIBPATH 357 #define DEFAULT_LIBPATH "/lib:/usr/lib" 358 #endif 359 360 #define EXTENSIONS_DIR "/lib/ext" 361 #define ENDORSED_DIR "/lib/endorsed" 362 #define REG_DIR "/usr/java/packages" 363 364 #ifdef __APPLE__ 365 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 366 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 367 const char *user_home_dir = get_home(); 368 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 369 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 370 sizeof(SYS_EXTENSIONS_DIRS); 371 #endif 372 373 { 374 /* sysclasspath, java_home, dll_dir */ 375 { 376 char *home_path; 377 char *dll_path; 378 char *pslash; 379 char buf[MAXPATHLEN]; 380 os::jvm_path(buf, sizeof(buf)); 381 382 // Found the full path to libjvm.so. 383 // Now cut the path to <java_home>/jre if we can. 384 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 385 pslash = strrchr(buf, '/'); 386 if (pslash != NULL) 387 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 388 dll_path = malloc(strlen(buf) + 1); 389 if (dll_path == NULL) 390 return; 391 strcpy(dll_path, buf); 392 Arguments::set_dll_dir(dll_path); 393 394 if (pslash != NULL) { 395 pslash = strrchr(buf, '/'); 396 if (pslash != NULL) { 397 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 398 #ifndef __APPLE__ 399 pslash = strrchr(buf, '/'); 400 if (pslash != NULL) 401 *pslash = '\0'; /* get rid of /lib */ 402 #endif 403 } 404 } 405 406 home_path = malloc(strlen(buf) + 1); 407 if (home_path == NULL) 408 return; 409 strcpy(home_path, buf); 410 Arguments::set_java_home(home_path); 411 412 if (!set_boot_path('/', ':')) 413 return; 414 } 415 416 /* 417 * Where to look for native libraries 418 * 419 * Note: Due to a legacy implementation, most of the library path 420 * is set in the launcher. This was to accomodate linking restrictions 421 * on legacy Bsd implementations (which are no longer supported). 422 * Eventually, all the library path setting will be done here. 423 * 424 * However, to prevent the proliferation of improperly built native 425 * libraries, the new path component /usr/java/packages is added here. 426 * Eventually, all the library path setting will be done here. 427 */ 428 { 429 char *ld_library_path; 430 431 /* 432 * Construct the invariant part of ld_library_path. Note that the 433 * space for the colon and the trailing null are provided by the 434 * nulls included by the sizeof operator (so actually we allocate 435 * a byte more than necessary). 436 */ 437 #ifdef __APPLE__ 438 ld_library_path = (char *) malloc(system_ext_size); 439 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 440 #else 441 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 442 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 443 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 444 #endif 445 446 /* 447 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 448 * should always exist (until the legacy problem cited above is 449 * addressed). 450 */ 451 #ifdef __APPLE__ 452 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 453 char *l = getenv("JAVA_LIBRARY_PATH"); 454 if (l != NULL) { 455 char *t = ld_library_path; 456 /* That's +1 for the colon and +1 for the trailing '\0' */ 457 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 458 sprintf(ld_library_path, "%s:%s", l, t); 459 free(t); 460 } 461 462 char *v = getenv("DYLD_LIBRARY_PATH"); 463 #else 464 char *v = getenv("LD_LIBRARY_PATH"); 465 #endif 466 if (v != NULL) { 467 char *t = ld_library_path; 468 /* That's +1 for the colon and +1 for the trailing '\0' */ 469 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 470 sprintf(ld_library_path, "%s:%s", v, t); 471 free(t); 472 } 473 474 #ifdef __APPLE__ 475 // Apple's Java6 has "." at the beginning of java.library.path. 476 // OpenJDK on Windows has "." at the end of java.library.path. 477 // OpenJDK on Linux and Solaris don't have "." in java.library.path 478 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 479 // "." is appended to the end of java.library.path. Yes, this 480 // could cause a change in behavior, but Apple's Java6 behavior 481 // can be achieved by putting "." at the beginning of the 482 // JAVA_LIBRARY_PATH environment variable. 483 { 484 char *t = ld_library_path; 485 // that's +3 for appending ":." and the trailing '\0' 486 ld_library_path = (char *) malloc(strlen(t) + 3); 487 sprintf(ld_library_path, "%s:%s", t, "."); 488 free(t); 489 } 490 #endif 491 492 Arguments::set_library_path(ld_library_path); 493 } 494 495 /* 496 * Extensions directories. 497 * 498 * Note that the space for the colon and the trailing null are provided 499 * by the nulls included by the sizeof operator (so actually one byte more 500 * than necessary is allocated). 501 */ 502 { 503 #ifdef __APPLE__ 504 char *buf = malloc(strlen(Arguments::get_java_home()) + 505 sizeof(EXTENSIONS_DIR) + system_ext_size); 506 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 507 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 508 #else 509 char *buf = malloc(strlen(Arguments::get_java_home()) + 510 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 511 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 512 Arguments::get_java_home()); 513 #endif 514 515 Arguments::set_ext_dirs(buf); 516 } 517 518 /* Endorsed standards default directory. */ 519 { 520 char * buf; 521 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 522 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 523 Arguments::set_endorsed_dirs(buf); 524 } 525 } 526 527 #ifdef __APPLE__ 528 #undef SYS_EXTENSIONS_DIR 529 #endif 530 #undef malloc 531 #undef getenv 532 #undef EXTENSIONS_DIR 533 #undef ENDORSED_DIR 534 535 // Done 536 return; 537 } 538 539 //////////////////////////////////////////////////////////////////////////////// 540 // breakpoint support 541 542 void os::breakpoint() { 543 BREAKPOINT; 544 } 545 546 extern "C" void breakpoint() { 547 // use debugger to set breakpoint here 548 } 549 550 //////////////////////////////////////////////////////////////////////////////// 551 // signal support 552 553 debug_only(static bool signal_sets_initialized = false); 554 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 555 556 bool os::Bsd::is_sig_ignored(int sig) { 557 struct sigaction oact; 558 sigaction(sig, (struct sigaction*)NULL, &oact); 559 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 560 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 561 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 562 return true; 563 else 564 return false; 565 } 566 567 void os::Bsd::signal_sets_init() { 568 // Should also have an assertion stating we are still single-threaded. 569 assert(!signal_sets_initialized, "Already initialized"); 570 // Fill in signals that are necessarily unblocked for all threads in 571 // the VM. Currently, we unblock the following signals: 572 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 573 // by -Xrs (=ReduceSignalUsage)); 574 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 575 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 576 // the dispositions or masks wrt these signals. 577 // Programs embedding the VM that want to use the above signals for their 578 // own purposes must, at this time, use the "-Xrs" option to prevent 579 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 580 // (See bug 4345157, and other related bugs). 581 // In reality, though, unblocking these signals is really a nop, since 582 // these signals are not blocked by default. 583 sigemptyset(&unblocked_sigs); 584 sigemptyset(&allowdebug_blocked_sigs); 585 sigaddset(&unblocked_sigs, SIGILL); 586 sigaddset(&unblocked_sigs, SIGSEGV); 587 sigaddset(&unblocked_sigs, SIGBUS); 588 sigaddset(&unblocked_sigs, SIGFPE); 589 sigaddset(&unblocked_sigs, SR_signum); 590 591 if (!ReduceSignalUsage) { 592 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 593 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 594 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 595 } 596 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 597 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 598 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 599 } 600 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 601 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 602 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 603 } 604 } 605 // Fill in signals that are blocked by all but the VM thread. 606 sigemptyset(&vm_sigs); 607 if (!ReduceSignalUsage) 608 sigaddset(&vm_sigs, BREAK_SIGNAL); 609 debug_only(signal_sets_initialized = true); 610 611 } 612 613 // These are signals that are unblocked while a thread is running Java. 614 // (For some reason, they get blocked by default.) 615 sigset_t* os::Bsd::unblocked_signals() { 616 assert(signal_sets_initialized, "Not initialized"); 617 return &unblocked_sigs; 618 } 619 620 // These are the signals that are blocked while a (non-VM) thread is 621 // running Java. Only the VM thread handles these signals. 622 sigset_t* os::Bsd::vm_signals() { 623 assert(signal_sets_initialized, "Not initialized"); 624 return &vm_sigs; 625 } 626 627 // These are signals that are blocked during cond_wait to allow debugger in 628 sigset_t* os::Bsd::allowdebug_blocked_signals() { 629 assert(signal_sets_initialized, "Not initialized"); 630 return &allowdebug_blocked_sigs; 631 } 632 633 void os::Bsd::hotspot_sigmask(Thread* thread) { 634 635 //Save caller's signal mask before setting VM signal mask 636 sigset_t caller_sigmask; 637 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 638 639 OSThread* osthread = thread->osthread(); 640 osthread->set_caller_sigmask(caller_sigmask); 641 642 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 643 644 if (!ReduceSignalUsage) { 645 if (thread->is_VM_thread()) { 646 // Only the VM thread handles BREAK_SIGNAL ... 647 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 648 } else { 649 // ... all other threads block BREAK_SIGNAL 650 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 651 } 652 } 653 } 654 655 656 ////////////////////////////////////////////////////////////////////////////// 657 // create new thread 658 659 static address highest_vm_reserved_address(); 660 661 // check if it's safe to start a new thread 662 static bool _thread_safety_check(Thread* thread) { 663 return true; 664 } 665 666 #ifdef __APPLE__ 667 // library handle for calling objc_registerThreadWithCollector() 668 // without static linking to the libobjc library 669 #define OBJC_LIB "/usr/lib/libobjc.dylib" 670 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 671 typedef void (*objc_registerThreadWithCollector_t)(); 672 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 673 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 674 #endif 675 676 // Thread start routine for all newly created threads 677 static void *java_start(Thread *thread) { 678 // Try to randomize the cache line index of hot stack frames. 679 // This helps when threads of the same stack traces evict each other's 680 // cache lines. The threads can be either from the same JVM instance, or 681 // from different JVM instances. The benefit is especially true for 682 // processors with hyperthreading technology. 683 static int counter = 0; 684 int pid = os::current_process_id(); 685 alloca(((pid ^ counter++) & 7) * 128); 686 687 ThreadLocalStorage::set_thread(thread); 688 689 OSThread* osthread = thread->osthread(); 690 Monitor* sync = osthread->startThread_lock(); 691 692 // non floating stack BsdThreads needs extra check, see above 693 if (!_thread_safety_check(thread)) { 694 // notify parent thread 695 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 696 osthread->set_state(ZOMBIE); 697 sync->notify_all(); 698 return NULL; 699 } 700 701 #ifdef __APPLE__ 702 // thread_id is mach thread on macos 703 osthread->set_thread_id(::mach_thread_self()); 704 #else 705 // thread_id is pthread_id on BSD 706 osthread->set_thread_id(::pthread_self()); 707 #endif 708 // initialize signal mask for this thread 709 os::Bsd::hotspot_sigmask(thread); 710 711 // initialize floating point control register 712 os::Bsd::init_thread_fpu_state(); 713 714 #ifdef __APPLE__ 715 // register thread with objc gc 716 if (objc_registerThreadWithCollectorFunction != NULL) { 717 objc_registerThreadWithCollectorFunction(); 718 } 719 #endif 720 721 // handshaking with parent thread 722 { 723 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 724 725 // notify parent thread 726 osthread->set_state(INITIALIZED); 727 sync->notify_all(); 728 729 // wait until os::start_thread() 730 while (osthread->get_state() == INITIALIZED) { 731 sync->wait(Mutex::_no_safepoint_check_flag); 732 } 733 } 734 735 // call one more level start routine 736 thread->run(); 737 738 return 0; 739 } 740 741 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 742 assert(thread->osthread() == NULL, "caller responsible"); 743 744 // Allocate the OSThread object 745 OSThread* osthread = new OSThread(NULL, NULL); 746 if (osthread == NULL) { 747 return false; 748 } 749 750 // set the correct thread state 751 osthread->set_thread_type(thr_type); 752 753 // Initial state is ALLOCATED but not INITIALIZED 754 osthread->set_state(ALLOCATED); 755 756 thread->set_osthread(osthread); 757 758 // init thread attributes 759 pthread_attr_t attr; 760 pthread_attr_init(&attr); 761 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 762 763 // stack size 764 if (os::Bsd::supports_variable_stack_size()) { 765 // calculate stack size if it's not specified by caller 766 if (stack_size == 0) { 767 stack_size = os::Bsd::default_stack_size(thr_type); 768 769 switch (thr_type) { 770 case os::java_thread: 771 // Java threads use ThreadStackSize which default value can be 772 // changed with the flag -Xss 773 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 774 stack_size = JavaThread::stack_size_at_create(); 775 break; 776 case os::compiler_thread: 777 if (CompilerThreadStackSize > 0) { 778 stack_size = (size_t)(CompilerThreadStackSize * K); 779 break; 780 } // else fall through: 781 // use VMThreadStackSize if CompilerThreadStackSize is not defined 782 case os::vm_thread: 783 case os::pgc_thread: 784 case os::cgc_thread: 785 case os::watcher_thread: 786 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 787 break; 788 } 789 } 790 791 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 792 pthread_attr_setstacksize(&attr, stack_size); 793 } else { 794 // let pthread_create() pick the default value. 795 } 796 797 ThreadState state; 798 799 { 800 pthread_t tid; 801 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 802 803 pthread_attr_destroy(&attr); 804 805 if (ret != 0) { 806 if (PrintMiscellaneous && (Verbose || WizardMode)) { 807 perror("pthread_create()"); 808 } 809 // Need to clean up stuff we've allocated so far 810 thread->set_osthread(NULL); 811 delete osthread; 812 return false; 813 } 814 815 // Store pthread info into the OSThread 816 osthread->set_pthread_id(tid); 817 818 // Wait until child thread is either initialized or aborted 819 { 820 Monitor* sync_with_child = osthread->startThread_lock(); 821 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 822 while ((state = osthread->get_state()) == ALLOCATED) { 823 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 824 } 825 } 826 827 } 828 829 // Aborted due to thread limit being reached 830 if (state == ZOMBIE) { 831 thread->set_osthread(NULL); 832 delete osthread; 833 return false; 834 } 835 836 // The thread is returned suspended (in state INITIALIZED), 837 // and is started higher up in the call chain 838 assert(state == INITIALIZED, "race condition"); 839 return true; 840 } 841 842 ///////////////////////////////////////////////////////////////////////////// 843 // attach existing thread 844 845 // bootstrap the main thread 846 bool os::create_main_thread(JavaThread* thread) { 847 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 848 return create_attached_thread(thread); 849 } 850 851 bool os::create_attached_thread(JavaThread* thread) { 852 #ifdef ASSERT 853 thread->verify_not_published(); 854 #endif 855 856 // Allocate the OSThread object 857 OSThread* osthread = new OSThread(NULL, NULL); 858 859 if (osthread == NULL) { 860 return false; 861 } 862 863 // Store pthread info into the OSThread 864 #ifdef __APPLE__ 865 osthread->set_thread_id(::mach_thread_self()); 866 #else 867 osthread->set_thread_id(::pthread_self()); 868 #endif 869 osthread->set_pthread_id(::pthread_self()); 870 871 // initialize floating point control register 872 os::Bsd::init_thread_fpu_state(); 873 874 // Initial thread state is RUNNABLE 875 osthread->set_state(RUNNABLE); 876 877 thread->set_osthread(osthread); 878 879 // initialize signal mask for this thread 880 // and save the caller's signal mask 881 os::Bsd::hotspot_sigmask(thread); 882 883 return true; 884 } 885 886 void os::pd_start_thread(Thread* thread) { 887 OSThread * osthread = thread->osthread(); 888 assert(osthread->get_state() != INITIALIZED, "just checking"); 889 Monitor* sync_with_child = osthread->startThread_lock(); 890 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 891 sync_with_child->notify(); 892 } 893 894 // Free Bsd resources related to the OSThread 895 void os::free_thread(OSThread* osthread) { 896 assert(osthread != NULL, "osthread not set"); 897 898 if (Thread::current()->osthread() == osthread) { 899 // Restore caller's signal mask 900 sigset_t sigmask = osthread->caller_sigmask(); 901 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 902 } 903 904 delete osthread; 905 } 906 907 ////////////////////////////////////////////////////////////////////////////// 908 // thread local storage 909 910 int os::allocate_thread_local_storage() { 911 pthread_key_t key; 912 int rslt = pthread_key_create(&key, NULL); 913 assert(rslt == 0, "cannot allocate thread local storage"); 914 return (int)key; 915 } 916 917 // Note: This is currently not used by VM, as we don't destroy TLS key 918 // on VM exit. 919 void os::free_thread_local_storage(int index) { 920 int rslt = pthread_key_delete((pthread_key_t)index); 921 assert(rslt == 0, "invalid index"); 922 } 923 924 void os::thread_local_storage_at_put(int index, void* value) { 925 int rslt = pthread_setspecific((pthread_key_t)index, value); 926 assert(rslt == 0, "pthread_setspecific failed"); 927 } 928 929 extern "C" Thread* get_thread() { 930 return ThreadLocalStorage::thread(); 931 } 932 933 934 //////////////////////////////////////////////////////////////////////////////// 935 // time support 936 937 // Time since start-up in seconds to a fine granularity. 938 // Used by VMSelfDestructTimer and the MemProfiler. 939 double os::elapsedTime() { 940 941 return (double)(os::elapsed_counter()) * 0.000001; 942 } 943 944 jlong os::elapsed_counter() { 945 timeval time; 946 int status = gettimeofday(&time, NULL); 947 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 948 } 949 950 jlong os::elapsed_frequency() { 951 return (1000 * 1000); 952 } 953 954 // XXX: For now, code this as if BSD does not support vtime. 955 bool os::supports_vtime() { return false; } 956 bool os::enable_vtime() { return false; } 957 bool os::vtime_enabled() { return false; } 958 double os::elapsedVTime() { 959 // better than nothing, but not much 960 return elapsedTime(); 961 } 962 963 jlong os::javaTimeMillis() { 964 timeval time; 965 int status = gettimeofday(&time, NULL); 966 assert(status != -1, "bsd error"); 967 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 968 } 969 970 #ifndef CLOCK_MONOTONIC 971 #define CLOCK_MONOTONIC (1) 972 #endif 973 974 #ifdef __APPLE__ 975 void os::Bsd::clock_init() { 976 // XXXDARWIN: Investigate replacement monotonic clock 977 } 978 #else 979 void os::Bsd::clock_init() { 980 struct timespec res; 981 struct timespec tp; 982 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 983 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 984 // yes, monotonic clock is supported 985 _clock_gettime = ::clock_gettime; 986 } 987 } 988 #endif 989 990 991 jlong os::javaTimeNanos() { 992 if (Bsd::supports_monotonic_clock()) { 993 struct timespec tp; 994 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 995 assert(status == 0, "gettime error"); 996 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 997 return result; 998 } else { 999 timeval time; 1000 int status = gettimeofday(&time, NULL); 1001 assert(status != -1, "bsd error"); 1002 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1003 return 1000 * usecs; 1004 } 1005 } 1006 1007 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1008 if (Bsd::supports_monotonic_clock()) { 1009 info_ptr->max_value = ALL_64_BITS; 1010 1011 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1012 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1013 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1014 } else { 1015 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1016 info_ptr->max_value = ALL_64_BITS; 1017 1018 // gettimeofday is a real time clock so it skips 1019 info_ptr->may_skip_backward = true; 1020 info_ptr->may_skip_forward = true; 1021 } 1022 1023 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1024 } 1025 1026 // Return the real, user, and system times in seconds from an 1027 // arbitrary fixed point in the past. 1028 bool os::getTimesSecs(double* process_real_time, 1029 double* process_user_time, 1030 double* process_system_time) { 1031 struct tms ticks; 1032 clock_t real_ticks = times(&ticks); 1033 1034 if (real_ticks == (clock_t) (-1)) { 1035 return false; 1036 } else { 1037 double ticks_per_second = (double) clock_tics_per_sec; 1038 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1039 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1040 *process_real_time = ((double) real_ticks) / ticks_per_second; 1041 1042 return true; 1043 } 1044 } 1045 1046 1047 char * os::local_time_string(char *buf, size_t buflen) { 1048 struct tm t; 1049 time_t long_time; 1050 time(&long_time); 1051 localtime_r(&long_time, &t); 1052 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1053 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1054 t.tm_hour, t.tm_min, t.tm_sec); 1055 return buf; 1056 } 1057 1058 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1059 return localtime_r(clock, res); 1060 } 1061 1062 //////////////////////////////////////////////////////////////////////////////// 1063 // runtime exit support 1064 1065 // Note: os::shutdown() might be called very early during initialization, or 1066 // called from signal handler. Before adding something to os::shutdown(), make 1067 // sure it is async-safe and can handle partially initialized VM. 1068 void os::shutdown() { 1069 1070 // allow PerfMemory to attempt cleanup of any persistent resources 1071 perfMemory_exit(); 1072 1073 // needs to remove object in file system 1074 AttachListener::abort(); 1075 1076 // flush buffered output, finish log files 1077 ostream_abort(); 1078 1079 // Check for abort hook 1080 abort_hook_t abort_hook = Arguments::abort_hook(); 1081 if (abort_hook != NULL) { 1082 abort_hook(); 1083 } 1084 1085 } 1086 1087 // Note: os::abort() might be called very early during initialization, or 1088 // called from signal handler. Before adding something to os::abort(), make 1089 // sure it is async-safe and can handle partially initialized VM. 1090 void os::abort(bool dump_core) { 1091 os::shutdown(); 1092 if (dump_core) { 1093 #ifndef PRODUCT 1094 fdStream out(defaultStream::output_fd()); 1095 out.print_raw("Current thread is "); 1096 char buf[16]; 1097 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1098 out.print_raw_cr(buf); 1099 out.print_raw_cr("Dumping core ..."); 1100 #endif 1101 ::abort(); // dump core 1102 } 1103 1104 ::exit(1); 1105 } 1106 1107 // Die immediately, no exit hook, no abort hook, no cleanup. 1108 void os::die() { 1109 // _exit() on BsdThreads only kills current thread 1110 ::abort(); 1111 } 1112 1113 // unused on bsd for now. 1114 void os::set_error_file(const char *logfile) {} 1115 1116 1117 // This method is a copy of JDK's sysGetLastErrorString 1118 // from src/solaris/hpi/src/system_md.c 1119 1120 size_t os::lasterror(char *buf, size_t len) { 1121 1122 if (errno == 0) return 0; 1123 1124 const char *s = ::strerror(errno); 1125 size_t n = ::strlen(s); 1126 if (n >= len) { 1127 n = len - 1; 1128 } 1129 ::strncpy(buf, s, n); 1130 buf[n] = '\0'; 1131 return n; 1132 } 1133 1134 intx os::current_thread_id() { 1135 #ifdef __APPLE__ 1136 return (intx)::mach_thread_self(); 1137 #else 1138 return (intx)::pthread_self(); 1139 #endif 1140 } 1141 int os::current_process_id() { 1142 1143 // Under the old bsd thread library, bsd gives each thread 1144 // its own process id. Because of this each thread will return 1145 // a different pid if this method were to return the result 1146 // of getpid(2). Bsd provides no api that returns the pid 1147 // of the launcher thread for the vm. This implementation 1148 // returns a unique pid, the pid of the launcher thread 1149 // that starts the vm 'process'. 1150 1151 // Under the NPTL, getpid() returns the same pid as the 1152 // launcher thread rather than a unique pid per thread. 1153 // Use gettid() if you want the old pre NPTL behaviour. 1154 1155 // if you are looking for the result of a call to getpid() that 1156 // returns a unique pid for the calling thread, then look at the 1157 // OSThread::thread_id() method in osThread_bsd.hpp file 1158 1159 return (int)(_initial_pid ? _initial_pid : getpid()); 1160 } 1161 1162 // DLL functions 1163 1164 #define JNI_LIB_PREFIX "lib" 1165 #ifdef __APPLE__ 1166 #define JNI_LIB_SUFFIX ".dylib" 1167 #else 1168 #define JNI_LIB_SUFFIX ".so" 1169 #endif 1170 1171 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1172 1173 // This must be hard coded because it's the system's temporary 1174 // directory not the java application's temp directory, ala java.io.tmpdir. 1175 #ifdef __APPLE__ 1176 // macosx has a secure per-user temporary directory 1177 char temp_path_storage[PATH_MAX]; 1178 const char* os::get_temp_directory() { 1179 static char *temp_path = NULL; 1180 if (temp_path == NULL) { 1181 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1182 if (pathSize == 0 || pathSize > PATH_MAX) { 1183 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1184 } 1185 temp_path = temp_path_storage; 1186 } 1187 return temp_path; 1188 } 1189 #else /* __APPLE__ */ 1190 const char* os::get_temp_directory() { return "/tmp"; } 1191 #endif /* __APPLE__ */ 1192 1193 static bool file_exists(const char* filename) { 1194 struct stat statbuf; 1195 if (filename == NULL || strlen(filename) == 0) { 1196 return false; 1197 } 1198 return os::stat(filename, &statbuf) == 0; 1199 } 1200 1201 void os::dll_build_name(char* buffer, size_t buflen, 1202 const char* pname, const char* fname) { 1203 // Copied from libhpi 1204 const size_t pnamelen = pname ? strlen(pname) : 0; 1205 1206 // Quietly truncate on buffer overflow. Should be an error. 1207 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1208 *buffer = '\0'; 1209 return; 1210 } 1211 1212 if (pnamelen == 0) { 1213 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1214 } else if (strchr(pname, *os::path_separator()) != NULL) { 1215 int n; 1216 char** pelements = split_path(pname, &n); 1217 for (int i = 0 ; i < n ; i++) { 1218 // Really shouldn't be NULL, but check can't hurt 1219 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1220 continue; // skip the empty path values 1221 } 1222 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1223 pelements[i], fname); 1224 if (file_exists(buffer)) { 1225 break; 1226 } 1227 } 1228 // release the storage 1229 for (int i = 0 ; i < n ; i++) { 1230 if (pelements[i] != NULL) { 1231 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1232 } 1233 } 1234 if (pelements != NULL) { 1235 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1236 } 1237 } else { 1238 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1239 } 1240 } 1241 1242 const char* os::get_current_directory(char *buf, int buflen) { 1243 return getcwd(buf, buflen); 1244 } 1245 1246 // check if addr is inside libjvm[_g].so 1247 bool os::address_is_in_vm(address addr) { 1248 static address libjvm_base_addr; 1249 Dl_info dlinfo; 1250 1251 if (libjvm_base_addr == NULL) { 1252 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1253 libjvm_base_addr = (address)dlinfo.dli_fbase; 1254 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1255 } 1256 1257 if (dladdr((void *)addr, &dlinfo)) { 1258 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1259 } 1260 1261 return false; 1262 } 1263 1264 1265 #define MACH_MAXSYMLEN 256 1266 1267 bool os::dll_address_to_function_name(address addr, char *buf, 1268 int buflen, int *offset) { 1269 Dl_info dlinfo; 1270 char localbuf[MACH_MAXSYMLEN]; 1271 1272 // dladdr will find names of dynamic functions only, but does 1273 // it set dli_fbase with mach_header address when it "fails" ? 1274 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1275 if (buf != NULL) { 1276 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1277 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1278 } 1279 } 1280 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1281 return true; 1282 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1283 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1284 buf, buflen, offset, dlinfo.dli_fname)) { 1285 return true; 1286 } 1287 } 1288 1289 // Handle non-dymanic manually: 1290 if (dlinfo.dli_fbase != NULL && 1291 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { 1292 if(!Decoder::demangle(localbuf, buf, buflen)) { 1293 jio_snprintf(buf, buflen, "%s", localbuf); 1294 } 1295 return true; 1296 } 1297 if (buf != NULL) buf[0] = '\0'; 1298 if (offset != NULL) *offset = -1; 1299 return false; 1300 } 1301 1302 // ported from solaris version 1303 bool os::dll_address_to_library_name(address addr, char* buf, 1304 int buflen, int* offset) { 1305 Dl_info dlinfo; 1306 1307 if (dladdr((void*)addr, &dlinfo)){ 1308 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1309 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1310 return true; 1311 } else { 1312 if (buf) buf[0] = '\0'; 1313 if (offset) *offset = -1; 1314 return false; 1315 } 1316 } 1317 1318 // Loads .dll/.so and 1319 // in case of error it checks if .dll/.so was built for the 1320 // same architecture as Hotspot is running on 1321 1322 #ifdef __APPLE__ 1323 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1324 void * result= ::dlopen(filename, RTLD_LAZY); 1325 if (result != NULL) { 1326 // Successful loading 1327 return result; 1328 } 1329 1330 // Read system error message into ebuf 1331 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1332 ebuf[ebuflen-1]='\0'; 1333 1334 return NULL; 1335 } 1336 #else 1337 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1338 { 1339 void * result= ::dlopen(filename, RTLD_LAZY); 1340 if (result != NULL) { 1341 // Successful loading 1342 return result; 1343 } 1344 1345 Elf32_Ehdr elf_head; 1346 1347 // Read system error message into ebuf 1348 // It may or may not be overwritten below 1349 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1350 ebuf[ebuflen-1]='\0'; 1351 int diag_msg_max_length=ebuflen-strlen(ebuf); 1352 char* diag_msg_buf=ebuf+strlen(ebuf); 1353 1354 if (diag_msg_max_length==0) { 1355 // No more space in ebuf for additional diagnostics message 1356 return NULL; 1357 } 1358 1359 1360 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1361 1362 if (file_descriptor < 0) { 1363 // Can't open library, report dlerror() message 1364 return NULL; 1365 } 1366 1367 bool failed_to_read_elf_head= 1368 (sizeof(elf_head)!= 1369 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1370 1371 ::close(file_descriptor); 1372 if (failed_to_read_elf_head) { 1373 // file i/o error - report dlerror() msg 1374 return NULL; 1375 } 1376 1377 typedef struct { 1378 Elf32_Half code; // Actual value as defined in elf.h 1379 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1380 char elf_class; // 32 or 64 bit 1381 char endianess; // MSB or LSB 1382 char* name; // String representation 1383 } arch_t; 1384 1385 #ifndef EM_486 1386 #define EM_486 6 /* Intel 80486 */ 1387 #endif 1388 1389 #ifndef EM_MIPS_RS3_LE 1390 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1391 #endif 1392 1393 #ifndef EM_PPC64 1394 #define EM_PPC64 21 /* PowerPC64 */ 1395 #endif 1396 1397 #ifndef EM_S390 1398 #define EM_S390 22 /* IBM System/390 */ 1399 #endif 1400 1401 #ifndef EM_IA_64 1402 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1403 #endif 1404 1405 #ifndef EM_X86_64 1406 #define EM_X86_64 62 /* AMD x86-64 */ 1407 #endif 1408 1409 static const arch_t arch_array[]={ 1410 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1411 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1412 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1413 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1414 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1415 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1416 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1417 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1418 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1419 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1420 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1421 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1422 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1423 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1424 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1425 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1426 }; 1427 1428 #if (defined IA32) 1429 static Elf32_Half running_arch_code=EM_386; 1430 #elif (defined AMD64) 1431 static Elf32_Half running_arch_code=EM_X86_64; 1432 #elif (defined IA64) 1433 static Elf32_Half running_arch_code=EM_IA_64; 1434 #elif (defined __sparc) && (defined _LP64) 1435 static Elf32_Half running_arch_code=EM_SPARCV9; 1436 #elif (defined __sparc) && (!defined _LP64) 1437 static Elf32_Half running_arch_code=EM_SPARC; 1438 #elif (defined __powerpc64__) 1439 static Elf32_Half running_arch_code=EM_PPC64; 1440 #elif (defined __powerpc__) 1441 static Elf32_Half running_arch_code=EM_PPC; 1442 #elif (defined ARM) 1443 static Elf32_Half running_arch_code=EM_ARM; 1444 #elif (defined S390) 1445 static Elf32_Half running_arch_code=EM_S390; 1446 #elif (defined ALPHA) 1447 static Elf32_Half running_arch_code=EM_ALPHA; 1448 #elif (defined MIPSEL) 1449 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1450 #elif (defined PARISC) 1451 static Elf32_Half running_arch_code=EM_PARISC; 1452 #elif (defined MIPS) 1453 static Elf32_Half running_arch_code=EM_MIPS; 1454 #elif (defined M68K) 1455 static Elf32_Half running_arch_code=EM_68K; 1456 #else 1457 #error Method os::dll_load requires that one of following is defined:\ 1458 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1459 #endif 1460 1461 // Identify compatability class for VM's architecture and library's architecture 1462 // Obtain string descriptions for architectures 1463 1464 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1465 int running_arch_index=-1; 1466 1467 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1468 if (running_arch_code == arch_array[i].code) { 1469 running_arch_index = i; 1470 } 1471 if (lib_arch.code == arch_array[i].code) { 1472 lib_arch.compat_class = arch_array[i].compat_class; 1473 lib_arch.name = arch_array[i].name; 1474 } 1475 } 1476 1477 assert(running_arch_index != -1, 1478 "Didn't find running architecture code (running_arch_code) in arch_array"); 1479 if (running_arch_index == -1) { 1480 // Even though running architecture detection failed 1481 // we may still continue with reporting dlerror() message 1482 return NULL; 1483 } 1484 1485 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1486 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1487 return NULL; 1488 } 1489 1490 #ifndef S390 1491 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1492 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1493 return NULL; 1494 } 1495 #endif // !S390 1496 1497 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1498 if ( lib_arch.name!=NULL ) { 1499 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1500 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1501 lib_arch.name, arch_array[running_arch_index].name); 1502 } else { 1503 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1504 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1505 lib_arch.code, 1506 arch_array[running_arch_index].name); 1507 } 1508 } 1509 1510 return NULL; 1511 } 1512 #endif /* !__APPLE__ */ 1513 1514 // XXX: Do we need a lock around this as per Linux? 1515 void* os::dll_lookup(void* handle, const char* name) { 1516 return dlsym(handle, name); 1517 } 1518 1519 1520 static bool _print_ascii_file(const char* filename, outputStream* st) { 1521 int fd = ::open(filename, O_RDONLY); 1522 if (fd == -1) { 1523 return false; 1524 } 1525 1526 char buf[32]; 1527 int bytes; 1528 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1529 st->print_raw(buf, bytes); 1530 } 1531 1532 ::close(fd); 1533 1534 return true; 1535 } 1536 1537 void os::print_dll_info(outputStream *st) { 1538 st->print_cr("Dynamic libraries:"); 1539 #ifdef RTLD_DI_LINKMAP 1540 Dl_info dli; 1541 void *handle; 1542 Link_map *map; 1543 Link_map *p; 1544 1545 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1546 st->print_cr("Error: Cannot print dynamic libraries."); 1547 return; 1548 } 1549 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1550 if (handle == NULL) { 1551 st->print_cr("Error: Cannot print dynamic libraries."); 1552 return; 1553 } 1554 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1555 if (map == NULL) { 1556 st->print_cr("Error: Cannot print dynamic libraries."); 1557 return; 1558 } 1559 1560 while (map->l_prev != NULL) 1561 map = map->l_prev; 1562 1563 while (map != NULL) { 1564 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1565 map = map->l_next; 1566 } 1567 1568 dlclose(handle); 1569 #elif defined(__APPLE__) 1570 uint32_t count; 1571 uint32_t i; 1572 1573 count = _dyld_image_count(); 1574 for (i = 1; i < count; i++) { 1575 const char *name = _dyld_get_image_name(i); 1576 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1577 st->print_cr(PTR_FORMAT " \t%s", slide, name); 1578 } 1579 #else 1580 st->print_cr("Error: Cannot print dynamic libraries."); 1581 #endif 1582 } 1583 1584 void os::print_os_info_brief(outputStream* st) { 1585 st->print("Bsd"); 1586 1587 os::Posix::print_uname_info(st); 1588 } 1589 1590 void os::print_os_info(outputStream* st) { 1591 st->print("OS:"); 1592 st->print("Bsd"); 1593 1594 os::Posix::print_uname_info(st); 1595 1596 os::Posix::print_rlimit_info(st); 1597 1598 os::Posix::print_load_average(st); 1599 } 1600 1601 void os::pd_print_cpu_info(outputStream* st) { 1602 // Nothing to do for now. 1603 } 1604 1605 void os::print_memory_info(outputStream* st) { 1606 1607 st->print("Memory:"); 1608 st->print(" %dk page", os::vm_page_size()>>10); 1609 1610 st->print(", physical " UINT64_FORMAT "k", 1611 os::physical_memory() >> 10); 1612 st->print("(" UINT64_FORMAT "k free)", 1613 os::available_memory() >> 10); 1614 st->cr(); 1615 1616 // meminfo 1617 st->print("\n/proc/meminfo:\n"); 1618 _print_ascii_file("/proc/meminfo", st); 1619 st->cr(); 1620 } 1621 1622 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1623 // but they're the same for all the bsd arch that we support 1624 // and they're the same for solaris but there's no common place to put this. 1625 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1626 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1627 "ILL_COPROC", "ILL_BADSTK" }; 1628 1629 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1630 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1631 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1632 1633 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1634 1635 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1636 1637 void os::print_siginfo(outputStream* st, void* siginfo) { 1638 st->print("siginfo:"); 1639 1640 const int buflen = 100; 1641 char buf[buflen]; 1642 siginfo_t *si = (siginfo_t*)siginfo; 1643 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1644 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1645 st->print("si_errno=%s", buf); 1646 } else { 1647 st->print("si_errno=%d", si->si_errno); 1648 } 1649 const int c = si->si_code; 1650 assert(c > 0, "unexpected si_code"); 1651 switch (si->si_signo) { 1652 case SIGILL: 1653 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1654 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1655 break; 1656 case SIGFPE: 1657 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1658 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1659 break; 1660 case SIGSEGV: 1661 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1662 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1663 break; 1664 case SIGBUS: 1665 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1666 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1667 break; 1668 default: 1669 st->print(", si_code=%d", si->si_code); 1670 // no si_addr 1671 } 1672 1673 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1674 UseSharedSpaces) { 1675 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1676 if (mapinfo->is_in_shared_space(si->si_addr)) { 1677 st->print("\n\nError accessing class data sharing archive." \ 1678 " Mapped file inaccessible during execution, " \ 1679 " possible disk/network problem."); 1680 } 1681 } 1682 st->cr(); 1683 } 1684 1685 1686 static void print_signal_handler(outputStream* st, int sig, 1687 char* buf, size_t buflen); 1688 1689 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1690 st->print_cr("Signal Handlers:"); 1691 print_signal_handler(st, SIGSEGV, buf, buflen); 1692 print_signal_handler(st, SIGBUS , buf, buflen); 1693 print_signal_handler(st, SIGFPE , buf, buflen); 1694 print_signal_handler(st, SIGPIPE, buf, buflen); 1695 print_signal_handler(st, SIGXFSZ, buf, buflen); 1696 print_signal_handler(st, SIGILL , buf, buflen); 1697 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1698 print_signal_handler(st, SR_signum, buf, buflen); 1699 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1700 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1701 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1702 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1703 } 1704 1705 static char saved_jvm_path[MAXPATHLEN] = {0}; 1706 1707 // Find the full path to the current module, libjvm or libjvm_g 1708 void os::jvm_path(char *buf, jint buflen) { 1709 // Error checking. 1710 if (buflen < MAXPATHLEN) { 1711 assert(false, "must use a large-enough buffer"); 1712 buf[0] = '\0'; 1713 return; 1714 } 1715 // Lazy resolve the path to current module. 1716 if (saved_jvm_path[0] != 0) { 1717 strcpy(buf, saved_jvm_path); 1718 return; 1719 } 1720 1721 char dli_fname[MAXPATHLEN]; 1722 bool ret = dll_address_to_library_name( 1723 CAST_FROM_FN_PTR(address, os::jvm_path), 1724 dli_fname, sizeof(dli_fname), NULL); 1725 assert(ret != 0, "cannot locate libjvm"); 1726 char *rp = realpath(dli_fname, buf); 1727 if (rp == NULL) 1728 return; 1729 1730 if (Arguments::created_by_gamma_launcher()) { 1731 // Support for the gamma launcher. Typical value for buf is 1732 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1733 // the right place in the string, then assume we are installed in a JDK and 1734 // we're done. Otherwise, check for a JAVA_HOME environment variable and 1735 // construct a path to the JVM being overridden. 1736 1737 const char *p = buf + strlen(buf) - 1; 1738 for (int count = 0; p > buf && count < 5; ++count) { 1739 for (--p; p > buf && *p != '/'; --p) 1740 /* empty */ ; 1741 } 1742 1743 if (strncmp(p, "/jre/lib/", 9) != 0) { 1744 // Look for JAVA_HOME in the environment. 1745 char* java_home_var = ::getenv("JAVA_HOME"); 1746 if (java_home_var != NULL && java_home_var[0] != 0) { 1747 char* jrelib_p; 1748 int len; 1749 1750 // Check the current module name "libjvm" or "libjvm_g". 1751 p = strrchr(buf, '/'); 1752 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1753 p = strstr(p, "_g") ? "_g" : ""; 1754 1755 rp = realpath(java_home_var, buf); 1756 if (rp == NULL) 1757 return; 1758 1759 // determine if this is a legacy image or modules image 1760 // modules image doesn't have "jre" subdirectory 1761 len = strlen(buf); 1762 jrelib_p = buf + len; 1763 1764 // Add the appropriate library subdir 1765 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1766 if (0 != access(buf, F_OK)) { 1767 snprintf(jrelib_p, buflen-len, "/lib"); 1768 } 1769 1770 // Add the appropriate client or server subdir 1771 len = strlen(buf); 1772 jrelib_p = buf + len; 1773 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1774 if (0 != access(buf, F_OK)) { 1775 snprintf(jrelib_p, buflen-len, ""); 1776 } 1777 1778 // If the path exists within JAVA_HOME, add the JVM library name 1779 // to complete the path to JVM being overridden. Otherwise fallback 1780 // to the path to the current library. 1781 if (0 == access(buf, F_OK)) { 1782 // Use current module name "libjvm[_g]" instead of 1783 // "libjvm"debug_only("_g")"" since for fastdebug version 1784 // we should have "libjvm" but debug_only("_g") adds "_g"! 1785 len = strlen(buf); 1786 snprintf(buf + len, buflen-len, "/libjvm%s%s", p, JNI_LIB_SUFFIX); 1787 } else { 1788 // Fall back to path of current library 1789 rp = realpath(dli_fname, buf); 1790 if (rp == NULL) 1791 return; 1792 } 1793 } 1794 } 1795 } 1796 1797 strcpy(saved_jvm_path, buf); 1798 } 1799 1800 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1801 // no prefix required, not even "_" 1802 } 1803 1804 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1805 // no suffix required 1806 } 1807 1808 //////////////////////////////////////////////////////////////////////////////// 1809 // sun.misc.Signal support 1810 1811 static volatile jint sigint_count = 0; 1812 1813 static void 1814 UserHandler(int sig, void *siginfo, void *context) { 1815 // 4511530 - sem_post is serialized and handled by the manager thread. When 1816 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1817 // don't want to flood the manager thread with sem_post requests. 1818 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1819 return; 1820 1821 // Ctrl-C is pressed during error reporting, likely because the error 1822 // handler fails to abort. Let VM die immediately. 1823 if (sig == SIGINT && is_error_reported()) { 1824 os::die(); 1825 } 1826 1827 os::signal_notify(sig); 1828 } 1829 1830 void* os::user_handler() { 1831 return CAST_FROM_FN_PTR(void*, UserHandler); 1832 } 1833 1834 extern "C" { 1835 typedef void (*sa_handler_t)(int); 1836 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1837 } 1838 1839 void* os::signal(int signal_number, void* handler) { 1840 struct sigaction sigAct, oldSigAct; 1841 1842 sigfillset(&(sigAct.sa_mask)); 1843 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1844 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1845 1846 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1847 // -1 means registration failed 1848 return (void *)-1; 1849 } 1850 1851 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1852 } 1853 1854 void os::signal_raise(int signal_number) { 1855 ::raise(signal_number); 1856 } 1857 1858 /* 1859 * The following code is moved from os.cpp for making this 1860 * code platform specific, which it is by its very nature. 1861 */ 1862 1863 // Will be modified when max signal is changed to be dynamic 1864 int os::sigexitnum_pd() { 1865 return NSIG; 1866 } 1867 1868 // a counter for each possible signal value 1869 static volatile jint pending_signals[NSIG+1] = { 0 }; 1870 1871 // Bsd(POSIX) specific hand shaking semaphore. 1872 #ifdef __APPLE__ 1873 static semaphore_t sig_sem; 1874 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1875 #define SEM_WAIT(sem) semaphore_wait(sem); 1876 #define SEM_POST(sem) semaphore_signal(sem); 1877 #else 1878 static sem_t sig_sem; 1879 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1880 #define SEM_WAIT(sem) sem_wait(&sem); 1881 #define SEM_POST(sem) sem_post(&sem); 1882 #endif 1883 1884 void os::signal_init_pd() { 1885 // Initialize signal structures 1886 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1887 1888 // Initialize signal semaphore 1889 ::SEM_INIT(sig_sem, 0); 1890 } 1891 1892 void os::signal_notify(int sig) { 1893 Atomic::inc(&pending_signals[sig]); 1894 ::SEM_POST(sig_sem); 1895 } 1896 1897 static int check_pending_signals(bool wait) { 1898 Atomic::store(0, &sigint_count); 1899 for (;;) { 1900 for (int i = 0; i < NSIG + 1; i++) { 1901 jint n = pending_signals[i]; 1902 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1903 return i; 1904 } 1905 } 1906 if (!wait) { 1907 return -1; 1908 } 1909 JavaThread *thread = JavaThread::current(); 1910 ThreadBlockInVM tbivm(thread); 1911 1912 bool threadIsSuspended; 1913 do { 1914 thread->set_suspend_equivalent(); 1915 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1916 ::SEM_WAIT(sig_sem); 1917 1918 // were we externally suspended while we were waiting? 1919 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1920 if (threadIsSuspended) { 1921 // 1922 // The semaphore has been incremented, but while we were waiting 1923 // another thread suspended us. We don't want to continue running 1924 // while suspended because that would surprise the thread that 1925 // suspended us. 1926 // 1927 ::SEM_POST(sig_sem); 1928 1929 thread->java_suspend_self(); 1930 } 1931 } while (threadIsSuspended); 1932 } 1933 } 1934 1935 int os::signal_lookup() { 1936 return check_pending_signals(false); 1937 } 1938 1939 int os::signal_wait() { 1940 return check_pending_signals(true); 1941 } 1942 1943 //////////////////////////////////////////////////////////////////////////////// 1944 // Virtual Memory 1945 1946 int os::vm_page_size() { 1947 // Seems redundant as all get out 1948 assert(os::Bsd::page_size() != -1, "must call os::init"); 1949 return os::Bsd::page_size(); 1950 } 1951 1952 // Solaris allocates memory by pages. 1953 int os::vm_allocation_granularity() { 1954 assert(os::Bsd::page_size() != -1, "must call os::init"); 1955 return os::Bsd::page_size(); 1956 } 1957 1958 // Rationale behind this function: 1959 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 1960 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 1961 // samples for JITted code. Here we create private executable mapping over the code cache 1962 // and then we can use standard (well, almost, as mapping can change) way to provide 1963 // info for the reporting script by storing timestamp and location of symbol 1964 void bsd_wrap_code(char* base, size_t size) { 1965 static volatile jint cnt = 0; 1966 1967 if (!UseOprofile) { 1968 return; 1969 } 1970 1971 char buf[PATH_MAX + 1]; 1972 int num = Atomic::add(1, &cnt); 1973 1974 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 1975 os::get_temp_directory(), os::current_process_id(), num); 1976 unlink(buf); 1977 1978 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 1979 1980 if (fd != -1) { 1981 off_t rv = ::lseek(fd, size-2, SEEK_SET); 1982 if (rv != (off_t)-1) { 1983 if (::write(fd, "", 1) == 1) { 1984 mmap(base, size, 1985 PROT_READ|PROT_WRITE|PROT_EXEC, 1986 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 1987 } 1988 } 1989 ::close(fd); 1990 unlink(buf); 1991 } 1992 } 1993 1994 // NOTE: Bsd kernel does not really reserve the pages for us. 1995 // All it does is to check if there are enough free pages 1996 // left at the time of mmap(). This could be a potential 1997 // problem. 1998 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 1999 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2000 #ifdef __OpenBSD__ 2001 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2002 return ::mprotect(addr, size, prot) == 0; 2003 #else 2004 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2005 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2006 return res != (uintptr_t) MAP_FAILED; 2007 #endif 2008 } 2009 2010 2011 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2012 bool exec) { 2013 return commit_memory(addr, size, exec); 2014 } 2015 2016 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2017 } 2018 2019 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2020 ::madvise(addr, bytes, MADV_DONTNEED); 2021 } 2022 2023 void os::numa_make_global(char *addr, size_t bytes) { 2024 } 2025 2026 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2027 } 2028 2029 bool os::numa_topology_changed() { return false; } 2030 2031 size_t os::numa_get_groups_num() { 2032 return 1; 2033 } 2034 2035 int os::numa_get_group_id() { 2036 return 0; 2037 } 2038 2039 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2040 if (size > 0) { 2041 ids[0] = 0; 2042 return 1; 2043 } 2044 return 0; 2045 } 2046 2047 bool os::get_page_info(char *start, page_info* info) { 2048 return false; 2049 } 2050 2051 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2052 return end; 2053 } 2054 2055 2056 bool os::pd_uncommit_memory(char* addr, size_t size) { 2057 #ifdef __OpenBSD__ 2058 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2059 return ::mprotect(addr, size, PROT_NONE) == 0; 2060 #else 2061 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2062 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2063 return res != (uintptr_t) MAP_FAILED; 2064 #endif 2065 } 2066 2067 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2068 return os::commit_memory(addr, size); 2069 } 2070 2071 // If this is a growable mapping, remove the guard pages entirely by 2072 // munmap()ping them. If not, just call uncommit_memory(). 2073 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2074 return os::uncommit_memory(addr, size); 2075 } 2076 2077 static address _highest_vm_reserved_address = NULL; 2078 2079 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2080 // at 'requested_addr'. If there are existing memory mappings at the same 2081 // location, however, they will be overwritten. If 'fixed' is false, 2082 // 'requested_addr' is only treated as a hint, the return value may or 2083 // may not start from the requested address. Unlike Bsd mmap(), this 2084 // function returns NULL to indicate failure. 2085 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2086 char * addr; 2087 int flags; 2088 2089 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2090 if (fixed) { 2091 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2092 flags |= MAP_FIXED; 2093 } 2094 2095 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 2096 // to PROT_EXEC if executable when we commit the page. 2097 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 2098 flags, -1, 0); 2099 2100 if (addr != MAP_FAILED) { 2101 // anon_mmap() should only get called during VM initialization, 2102 // don't need lock (actually we can skip locking even it can be called 2103 // from multiple threads, because _highest_vm_reserved_address is just a 2104 // hint about the upper limit of non-stack memory regions.) 2105 if ((address)addr + bytes > _highest_vm_reserved_address) { 2106 _highest_vm_reserved_address = (address)addr + bytes; 2107 } 2108 } 2109 2110 return addr == MAP_FAILED ? NULL : addr; 2111 } 2112 2113 // Don't update _highest_vm_reserved_address, because there might be memory 2114 // regions above addr + size. If so, releasing a memory region only creates 2115 // a hole in the address space, it doesn't help prevent heap-stack collision. 2116 // 2117 static int anon_munmap(char * addr, size_t size) { 2118 return ::munmap(addr, size) == 0; 2119 } 2120 2121 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2122 size_t alignment_hint) { 2123 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2124 } 2125 2126 bool os::pd_release_memory(char* addr, size_t size) { 2127 return anon_munmap(addr, size); 2128 } 2129 2130 static address highest_vm_reserved_address() { 2131 return _highest_vm_reserved_address; 2132 } 2133 2134 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2135 // Bsd wants the mprotect address argument to be page aligned. 2136 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2137 2138 // According to SUSv3, mprotect() should only be used with mappings 2139 // established by mmap(), and mmap() always maps whole pages. Unaligned 2140 // 'addr' likely indicates problem in the VM (e.g. trying to change 2141 // protection of malloc'ed or statically allocated memory). Check the 2142 // caller if you hit this assert. 2143 assert(addr == bottom, "sanity check"); 2144 2145 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2146 return ::mprotect(bottom, size, prot) == 0; 2147 } 2148 2149 // Set protections specified 2150 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2151 bool is_committed) { 2152 unsigned int p = 0; 2153 switch (prot) { 2154 case MEM_PROT_NONE: p = PROT_NONE; break; 2155 case MEM_PROT_READ: p = PROT_READ; break; 2156 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2157 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2158 default: 2159 ShouldNotReachHere(); 2160 } 2161 // is_committed is unused. 2162 return bsd_mprotect(addr, bytes, p); 2163 } 2164 2165 bool os::guard_memory(char* addr, size_t size) { 2166 return bsd_mprotect(addr, size, PROT_NONE); 2167 } 2168 2169 bool os::unguard_memory(char* addr, size_t size) { 2170 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2171 } 2172 2173 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2174 return false; 2175 } 2176 2177 /* 2178 * Set the coredump_filter bits to include largepages in core dump (bit 6) 2179 * 2180 * From the coredump_filter documentation: 2181 * 2182 * - (bit 0) anonymous private memory 2183 * - (bit 1) anonymous shared memory 2184 * - (bit 2) file-backed private memory 2185 * - (bit 3) file-backed shared memory 2186 * - (bit 4) ELF header pages in file-backed private memory areas (it is 2187 * effective only if the bit 2 is cleared) 2188 * - (bit 5) hugetlb private memory 2189 * - (bit 6) hugetlb shared memory 2190 */ 2191 static void set_coredump_filter(void) { 2192 FILE *f; 2193 long cdm; 2194 2195 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 2196 return; 2197 } 2198 2199 if (fscanf(f, "%lx", &cdm) != 1) { 2200 fclose(f); 2201 return; 2202 } 2203 2204 rewind(f); 2205 2206 if ((cdm & LARGEPAGES_BIT) == 0) { 2207 cdm |= LARGEPAGES_BIT; 2208 fprintf(f, "%#lx", cdm); 2209 } 2210 2211 fclose(f); 2212 } 2213 2214 // Large page support 2215 2216 static size_t _large_page_size = 0; 2217 2218 void os::large_page_init() { 2219 } 2220 2221 2222 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 2223 // "exec" is passed in but not used. Creating the shared image for 2224 // the code cache doesn't have an SHM_X executable permission to check. 2225 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2226 2227 key_t key = IPC_PRIVATE; 2228 char *addr; 2229 2230 bool warn_on_failure = UseLargePages && 2231 (!FLAG_IS_DEFAULT(UseLargePages) || 2232 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2233 ); 2234 char msg[128]; 2235 2236 // Create a large shared memory region to attach to based on size. 2237 // Currently, size is the total size of the heap 2238 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2239 if (shmid == -1) { 2240 // Possible reasons for shmget failure: 2241 // 1. shmmax is too small for Java heap. 2242 // > check shmmax value: cat /proc/sys/kernel/shmmax 2243 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2244 // 2. not enough large page memory. 2245 // > check available large pages: cat /proc/meminfo 2246 // > increase amount of large pages: 2247 // echo new_value > /proc/sys/vm/nr_hugepages 2248 // Note 1: different Bsd may use different name for this property, 2249 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2250 // Note 2: it's possible there's enough physical memory available but 2251 // they are so fragmented after a long run that they can't 2252 // coalesce into large pages. Try to reserve large pages when 2253 // the system is still "fresh". 2254 if (warn_on_failure) { 2255 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2256 warning(msg); 2257 } 2258 return NULL; 2259 } 2260 2261 // attach to the region 2262 addr = (char*)shmat(shmid, req_addr, 0); 2263 int err = errno; 2264 2265 // Remove shmid. If shmat() is successful, the actual shared memory segment 2266 // will be deleted when it's detached by shmdt() or when the process 2267 // terminates. If shmat() is not successful this will remove the shared 2268 // segment immediately. 2269 shmctl(shmid, IPC_RMID, NULL); 2270 2271 if ((intptr_t)addr == -1) { 2272 if (warn_on_failure) { 2273 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2274 warning(msg); 2275 } 2276 return NULL; 2277 } 2278 2279 return addr; 2280 } 2281 2282 bool os::release_memory_special(char* base, size_t bytes) { 2283 // detaching the SHM segment will also delete it, see reserve_memory_special() 2284 int rslt = shmdt(base); 2285 return rslt == 0; 2286 } 2287 2288 size_t os::large_page_size() { 2289 return _large_page_size; 2290 } 2291 2292 // HugeTLBFS allows application to commit large page memory on demand; 2293 // with SysV SHM the entire memory region must be allocated as shared 2294 // memory. 2295 bool os::can_commit_large_page_memory() { 2296 return UseHugeTLBFS; 2297 } 2298 2299 bool os::can_execute_large_page_memory() { 2300 return UseHugeTLBFS; 2301 } 2302 2303 // Reserve memory at an arbitrary address, only if that area is 2304 // available (and not reserved for something else). 2305 2306 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2307 const int max_tries = 10; 2308 char* base[max_tries]; 2309 size_t size[max_tries]; 2310 const size_t gap = 0x000000; 2311 2312 // Assert only that the size is a multiple of the page size, since 2313 // that's all that mmap requires, and since that's all we really know 2314 // about at this low abstraction level. If we need higher alignment, 2315 // we can either pass an alignment to this method or verify alignment 2316 // in one of the methods further up the call chain. See bug 5044738. 2317 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2318 2319 // Repeatedly allocate blocks until the block is allocated at the 2320 // right spot. Give up after max_tries. Note that reserve_memory() will 2321 // automatically update _highest_vm_reserved_address if the call is 2322 // successful. The variable tracks the highest memory address every reserved 2323 // by JVM. It is used to detect heap-stack collision if running with 2324 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2325 // space than needed, it could confuse the collision detecting code. To 2326 // solve the problem, save current _highest_vm_reserved_address and 2327 // calculate the correct value before return. 2328 address old_highest = _highest_vm_reserved_address; 2329 2330 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2331 // if kernel honors the hint then we can return immediately. 2332 char * addr = anon_mmap(requested_addr, bytes, false); 2333 if (addr == requested_addr) { 2334 return requested_addr; 2335 } 2336 2337 if (addr != NULL) { 2338 // mmap() is successful but it fails to reserve at the requested address 2339 anon_munmap(addr, bytes); 2340 } 2341 2342 int i; 2343 for (i = 0; i < max_tries; ++i) { 2344 base[i] = reserve_memory(bytes); 2345 2346 if (base[i] != NULL) { 2347 // Is this the block we wanted? 2348 if (base[i] == requested_addr) { 2349 size[i] = bytes; 2350 break; 2351 } 2352 2353 // Does this overlap the block we wanted? Give back the overlapped 2354 // parts and try again. 2355 2356 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2357 if (top_overlap >= 0 && top_overlap < bytes) { 2358 unmap_memory(base[i], top_overlap); 2359 base[i] += top_overlap; 2360 size[i] = bytes - top_overlap; 2361 } else { 2362 size_t bottom_overlap = base[i] + bytes - requested_addr; 2363 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2364 unmap_memory(requested_addr, bottom_overlap); 2365 size[i] = bytes - bottom_overlap; 2366 } else { 2367 size[i] = bytes; 2368 } 2369 } 2370 } 2371 } 2372 2373 // Give back the unused reserved pieces. 2374 2375 for (int j = 0; j < i; ++j) { 2376 if (base[j] != NULL) { 2377 unmap_memory(base[j], size[j]); 2378 } 2379 } 2380 2381 if (i < max_tries) { 2382 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2383 return requested_addr; 2384 } else { 2385 _highest_vm_reserved_address = old_highest; 2386 return NULL; 2387 } 2388 } 2389 2390 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2391 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2392 } 2393 2394 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2395 // Solaris uses poll(), bsd uses park(). 2396 // Poll() is likely a better choice, assuming that Thread.interrupt() 2397 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2398 // SIGSEGV, see 4355769. 2399 2400 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2401 assert(thread == Thread::current(), "thread consistency check"); 2402 2403 ParkEvent * const slp = thread->_SleepEvent ; 2404 slp->reset() ; 2405 OrderAccess::fence() ; 2406 2407 if (interruptible) { 2408 jlong prevtime = javaTimeNanos(); 2409 2410 for (;;) { 2411 if (os::is_interrupted(thread, true)) { 2412 return OS_INTRPT; 2413 } 2414 2415 jlong newtime = javaTimeNanos(); 2416 2417 if (newtime - prevtime < 0) { 2418 // time moving backwards, should only happen if no monotonic clock 2419 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2420 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2421 } else { 2422 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2423 } 2424 2425 if(millis <= 0) { 2426 return OS_OK; 2427 } 2428 2429 prevtime = newtime; 2430 2431 { 2432 assert(thread->is_Java_thread(), "sanity check"); 2433 JavaThread *jt = (JavaThread *) thread; 2434 ThreadBlockInVM tbivm(jt); 2435 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2436 2437 jt->set_suspend_equivalent(); 2438 // cleared by handle_special_suspend_equivalent_condition() or 2439 // java_suspend_self() via check_and_wait_while_suspended() 2440 2441 slp->park(millis); 2442 2443 // were we externally suspended while we were waiting? 2444 jt->check_and_wait_while_suspended(); 2445 } 2446 } 2447 } else { 2448 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2449 jlong prevtime = javaTimeNanos(); 2450 2451 for (;;) { 2452 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2453 // the 1st iteration ... 2454 jlong newtime = javaTimeNanos(); 2455 2456 if (newtime - prevtime < 0) { 2457 // time moving backwards, should only happen if no monotonic clock 2458 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2459 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2460 } else { 2461 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2462 } 2463 2464 if(millis <= 0) break ; 2465 2466 prevtime = newtime; 2467 slp->park(millis); 2468 } 2469 return OS_OK ; 2470 } 2471 } 2472 2473 int os::naked_sleep() { 2474 // %% make the sleep time an integer flag. for now use 1 millisec. 2475 return os::sleep(Thread::current(), 1, false); 2476 } 2477 2478 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2479 void os::infinite_sleep() { 2480 while (true) { // sleep forever ... 2481 ::sleep(100); // ... 100 seconds at a time 2482 } 2483 } 2484 2485 // Used to convert frequent JVM_Yield() to nops 2486 bool os::dont_yield() { 2487 return DontYieldALot; 2488 } 2489 2490 void os::yield() { 2491 sched_yield(); 2492 } 2493 2494 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2495 2496 void os::yield_all(int attempts) { 2497 // Yields to all threads, including threads with lower priorities 2498 // Threads on Bsd are all with same priority. The Solaris style 2499 // os::yield_all() with nanosleep(1ms) is not necessary. 2500 sched_yield(); 2501 } 2502 2503 // Called from the tight loops to possibly influence time-sharing heuristics 2504 void os::loop_breaker(int attempts) { 2505 os::yield_all(attempts); 2506 } 2507 2508 //////////////////////////////////////////////////////////////////////////////// 2509 // thread priority support 2510 2511 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2512 // only supports dynamic priority, static priority must be zero. For real-time 2513 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2514 // However, for large multi-threaded applications, SCHED_RR is not only slower 2515 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2516 // of 5 runs - Sep 2005). 2517 // 2518 // The following code actually changes the niceness of kernel-thread/LWP. It 2519 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2520 // not the entire user process, and user level threads are 1:1 mapped to kernel 2521 // threads. It has always been the case, but could change in the future. For 2522 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2523 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2524 2525 #if !defined(__APPLE__) 2526 int os::java_to_os_priority[CriticalPriority + 1] = { 2527 19, // 0 Entry should never be used 2528 2529 0, // 1 MinPriority 2530 3, // 2 2531 6, // 3 2532 2533 10, // 4 2534 15, // 5 NormPriority 2535 18, // 6 2536 2537 21, // 7 2538 25, // 8 2539 28, // 9 NearMaxPriority 2540 2541 31, // 10 MaxPriority 2542 2543 31 // 11 CriticalPriority 2544 }; 2545 #else 2546 /* Using Mach high-level priority assignments */ 2547 int os::java_to_os_priority[CriticalPriority + 1] = { 2548 0, // 0 Entry should never be used (MINPRI_USER) 2549 2550 27, // 1 MinPriority 2551 28, // 2 2552 29, // 3 2553 2554 30, // 4 2555 31, // 5 NormPriority (BASEPRI_DEFAULT) 2556 32, // 6 2557 2558 33, // 7 2559 34, // 8 2560 35, // 9 NearMaxPriority 2561 2562 36, // 10 MaxPriority 2563 2564 36 // 11 CriticalPriority 2565 }; 2566 #endif 2567 2568 static int prio_init() { 2569 if (ThreadPriorityPolicy == 1) { 2570 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2571 // if effective uid is not root. Perhaps, a more elegant way of doing 2572 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2573 if (geteuid() != 0) { 2574 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2575 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2576 } 2577 ThreadPriorityPolicy = 0; 2578 } 2579 } 2580 if (UseCriticalJavaThreadPriority) { 2581 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2582 } 2583 return 0; 2584 } 2585 2586 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2587 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2588 2589 #ifdef __OpenBSD__ 2590 // OpenBSD pthread_setprio starves low priority threads 2591 return OS_OK; 2592 #elif defined(__FreeBSD__) 2593 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2594 #elif defined(__APPLE__) || defined(__NetBSD__) 2595 struct sched_param sp; 2596 int policy; 2597 pthread_t self = pthread_self(); 2598 2599 if (pthread_getschedparam(self, &policy, &sp) != 0) 2600 return OS_ERR; 2601 2602 sp.sched_priority = newpri; 2603 if (pthread_setschedparam(self, policy, &sp) != 0) 2604 return OS_ERR; 2605 2606 return OS_OK; 2607 #else 2608 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2609 return (ret == 0) ? OS_OK : OS_ERR; 2610 #endif 2611 } 2612 2613 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2614 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2615 *priority_ptr = java_to_os_priority[NormPriority]; 2616 return OS_OK; 2617 } 2618 2619 errno = 0; 2620 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2621 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2622 #elif defined(__APPLE__) || defined(__NetBSD__) 2623 int policy; 2624 struct sched_param sp; 2625 2626 pthread_getschedparam(pthread_self(), &policy, &sp); 2627 *priority_ptr = sp.sched_priority; 2628 #else 2629 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2630 #endif 2631 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2632 } 2633 2634 // Hint to the underlying OS that a task switch would not be good. 2635 // Void return because it's a hint and can fail. 2636 void os::hint_no_preempt() {} 2637 2638 //////////////////////////////////////////////////////////////////////////////// 2639 // suspend/resume support 2640 2641 // the low-level signal-based suspend/resume support is a remnant from the 2642 // old VM-suspension that used to be for java-suspension, safepoints etc, 2643 // within hotspot. Now there is a single use-case for this: 2644 // - calling get_thread_pc() on the VMThread by the flat-profiler task 2645 // that runs in the watcher thread. 2646 // The remaining code is greatly simplified from the more general suspension 2647 // code that used to be used. 2648 // 2649 // The protocol is quite simple: 2650 // - suspend: 2651 // - sends a signal to the target thread 2652 // - polls the suspend state of the osthread using a yield loop 2653 // - target thread signal handler (SR_handler) sets suspend state 2654 // and blocks in sigsuspend until continued 2655 // - resume: 2656 // - sets target osthread state to continue 2657 // - sends signal to end the sigsuspend loop in the SR_handler 2658 // 2659 // Note that the SR_lock plays no role in this suspend/resume protocol. 2660 // 2661 2662 static void resume_clear_context(OSThread *osthread) { 2663 osthread->set_ucontext(NULL); 2664 osthread->set_siginfo(NULL); 2665 2666 // notify the suspend action is completed, we have now resumed 2667 osthread->sr.clear_suspended(); 2668 } 2669 2670 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2671 osthread->set_ucontext(context); 2672 osthread->set_siginfo(siginfo); 2673 } 2674 2675 // 2676 // Handler function invoked when a thread's execution is suspended or 2677 // resumed. We have to be careful that only async-safe functions are 2678 // called here (Note: most pthread functions are not async safe and 2679 // should be avoided.) 2680 // 2681 // Note: sigwait() is a more natural fit than sigsuspend() from an 2682 // interface point of view, but sigwait() prevents the signal hander 2683 // from being run. libpthread would get very confused by not having 2684 // its signal handlers run and prevents sigwait()'s use with the 2685 // mutex granting granting signal. 2686 // 2687 // Currently only ever called on the VMThread 2688 // 2689 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2690 // Save and restore errno to avoid confusing native code with EINTR 2691 // after sigsuspend. 2692 int old_errno = errno; 2693 2694 Thread* thread = Thread::current(); 2695 OSThread* osthread = thread->osthread(); 2696 assert(thread->is_VM_thread(), "Must be VMThread"); 2697 // read current suspend action 2698 int action = osthread->sr.suspend_action(); 2699 if (action == SR_SUSPEND) { 2700 suspend_save_context(osthread, siginfo, context); 2701 2702 // Notify the suspend action is about to be completed. do_suspend() 2703 // waits until SR_SUSPENDED is set and then returns. We will wait 2704 // here for a resume signal and that completes the suspend-other 2705 // action. do_suspend/do_resume is always called as a pair from 2706 // the same thread - so there are no races 2707 2708 // notify the caller 2709 osthread->sr.set_suspended(); 2710 2711 sigset_t suspend_set; // signals for sigsuspend() 2712 2713 // get current set of blocked signals and unblock resume signal 2714 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2715 sigdelset(&suspend_set, SR_signum); 2716 2717 // wait here until we are resumed 2718 do { 2719 sigsuspend(&suspend_set); 2720 // ignore all returns until we get a resume signal 2721 } while (osthread->sr.suspend_action() != SR_CONTINUE); 2722 2723 resume_clear_context(osthread); 2724 2725 } else { 2726 assert(action == SR_CONTINUE, "unexpected sr action"); 2727 // nothing special to do - just leave the handler 2728 } 2729 2730 errno = old_errno; 2731 } 2732 2733 2734 static int SR_initialize() { 2735 struct sigaction act; 2736 char *s; 2737 /* Get signal number to use for suspend/resume */ 2738 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2739 int sig = ::strtol(s, 0, 10); 2740 if (sig > 0 || sig < NSIG) { 2741 SR_signum = sig; 2742 } 2743 } 2744 2745 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2746 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2747 2748 sigemptyset(&SR_sigset); 2749 sigaddset(&SR_sigset, SR_signum); 2750 2751 /* Set up signal handler for suspend/resume */ 2752 act.sa_flags = SA_RESTART|SA_SIGINFO; 2753 act.sa_handler = (void (*)(int)) SR_handler; 2754 2755 // SR_signum is blocked by default. 2756 // 4528190 - We also need to block pthread restart signal (32 on all 2757 // supported Bsd platforms). Note that BsdThreads need to block 2758 // this signal for all threads to work properly. So we don't have 2759 // to use hard-coded signal number when setting up the mask. 2760 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2761 2762 if (sigaction(SR_signum, &act, 0) == -1) { 2763 return -1; 2764 } 2765 2766 // Save signal flag 2767 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2768 return 0; 2769 } 2770 2771 static int SR_finalize() { 2772 return 0; 2773 } 2774 2775 2776 // returns true on success and false on error - really an error is fatal 2777 // but this seems the normal response to library errors 2778 static bool do_suspend(OSThread* osthread) { 2779 // mark as suspended and send signal 2780 osthread->sr.set_suspend_action(SR_SUSPEND); 2781 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2782 assert_status(status == 0, status, "pthread_kill"); 2783 2784 // check status and wait until notified of suspension 2785 if (status == 0) { 2786 for (int i = 0; !osthread->sr.is_suspended(); i++) { 2787 os::yield_all(i); 2788 } 2789 osthread->sr.set_suspend_action(SR_NONE); 2790 return true; 2791 } 2792 else { 2793 osthread->sr.set_suspend_action(SR_NONE); 2794 return false; 2795 } 2796 } 2797 2798 static void do_resume(OSThread* osthread) { 2799 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2800 osthread->sr.set_suspend_action(SR_CONTINUE); 2801 2802 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2803 assert_status(status == 0, status, "pthread_kill"); 2804 // check status and wait unit notified of resumption 2805 if (status == 0) { 2806 for (int i = 0; osthread->sr.is_suspended(); i++) { 2807 os::yield_all(i); 2808 } 2809 } 2810 osthread->sr.set_suspend_action(SR_NONE); 2811 } 2812 2813 //////////////////////////////////////////////////////////////////////////////// 2814 // interrupt support 2815 2816 void os::interrupt(Thread* thread) { 2817 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2818 "possibility of dangling Thread pointer"); 2819 2820 OSThread* osthread = thread->osthread(); 2821 2822 if (!osthread->interrupted()) { 2823 osthread->set_interrupted(true); 2824 // More than one thread can get here with the same value of osthread, 2825 // resulting in multiple notifications. We do, however, want the store 2826 // to interrupted() to be visible to other threads before we execute unpark(). 2827 OrderAccess::fence(); 2828 ParkEvent * const slp = thread->_SleepEvent ; 2829 if (slp != NULL) slp->unpark() ; 2830 } 2831 2832 // For JSR166. Unpark even if interrupt status already was set 2833 if (thread->is_Java_thread()) 2834 ((JavaThread*)thread)->parker()->unpark(); 2835 2836 ParkEvent * ev = thread->_ParkEvent ; 2837 if (ev != NULL) ev->unpark() ; 2838 2839 } 2840 2841 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2842 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2843 "possibility of dangling Thread pointer"); 2844 2845 OSThread* osthread = thread->osthread(); 2846 2847 bool interrupted = osthread->interrupted(); 2848 2849 if (interrupted && clear_interrupted) { 2850 osthread->set_interrupted(false); 2851 // consider thread->_SleepEvent->reset() ... optional optimization 2852 } 2853 2854 return interrupted; 2855 } 2856 2857 /////////////////////////////////////////////////////////////////////////////////// 2858 // signal handling (except suspend/resume) 2859 2860 // This routine may be used by user applications as a "hook" to catch signals. 2861 // The user-defined signal handler must pass unrecognized signals to this 2862 // routine, and if it returns true (non-zero), then the signal handler must 2863 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2864 // routine will never retun false (zero), but instead will execute a VM panic 2865 // routine kill the process. 2866 // 2867 // If this routine returns false, it is OK to call it again. This allows 2868 // the user-defined signal handler to perform checks either before or after 2869 // the VM performs its own checks. Naturally, the user code would be making 2870 // a serious error if it tried to handle an exception (such as a null check 2871 // or breakpoint) that the VM was generating for its own correct operation. 2872 // 2873 // This routine may recognize any of the following kinds of signals: 2874 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2875 // It should be consulted by handlers for any of those signals. 2876 // 2877 // The caller of this routine must pass in the three arguments supplied 2878 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2879 // field of the structure passed to sigaction(). This routine assumes that 2880 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2881 // 2882 // Note that the VM will print warnings if it detects conflicting signal 2883 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2884 // 2885 extern "C" JNIEXPORT int 2886 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2887 void* ucontext, int abort_if_unrecognized); 2888 2889 void signalHandler(int sig, siginfo_t* info, void* uc) { 2890 assert(info != NULL && uc != NULL, "it must be old kernel"); 2891 JVM_handle_bsd_signal(sig, info, uc, true); 2892 } 2893 2894 2895 // This boolean allows users to forward their own non-matching signals 2896 // to JVM_handle_bsd_signal, harmlessly. 2897 bool os::Bsd::signal_handlers_are_installed = false; 2898 2899 // For signal-chaining 2900 struct sigaction os::Bsd::sigact[MAXSIGNUM]; 2901 unsigned int os::Bsd::sigs = 0; 2902 bool os::Bsd::libjsig_is_loaded = false; 2903 typedef struct sigaction *(*get_signal_t)(int); 2904 get_signal_t os::Bsd::get_signal_action = NULL; 2905 2906 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2907 struct sigaction *actp = NULL; 2908 2909 if (libjsig_is_loaded) { 2910 // Retrieve the old signal handler from libjsig 2911 actp = (*get_signal_action)(sig); 2912 } 2913 if (actp == NULL) { 2914 // Retrieve the preinstalled signal handler from jvm 2915 actp = get_preinstalled_handler(sig); 2916 } 2917 2918 return actp; 2919 } 2920 2921 static bool call_chained_handler(struct sigaction *actp, int sig, 2922 siginfo_t *siginfo, void *context) { 2923 // Call the old signal handler 2924 if (actp->sa_handler == SIG_DFL) { 2925 // It's more reasonable to let jvm treat it as an unexpected exception 2926 // instead of taking the default action. 2927 return false; 2928 } else if (actp->sa_handler != SIG_IGN) { 2929 if ((actp->sa_flags & SA_NODEFER) == 0) { 2930 // automaticlly block the signal 2931 sigaddset(&(actp->sa_mask), sig); 2932 } 2933 2934 sa_handler_t hand; 2935 sa_sigaction_t sa; 2936 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2937 // retrieve the chained handler 2938 if (siginfo_flag_set) { 2939 sa = actp->sa_sigaction; 2940 } else { 2941 hand = actp->sa_handler; 2942 } 2943 2944 if ((actp->sa_flags & SA_RESETHAND) != 0) { 2945 actp->sa_handler = SIG_DFL; 2946 } 2947 2948 // try to honor the signal mask 2949 sigset_t oset; 2950 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 2951 2952 // call into the chained handler 2953 if (siginfo_flag_set) { 2954 (*sa)(sig, siginfo, context); 2955 } else { 2956 (*hand)(sig); 2957 } 2958 2959 // restore the signal mask 2960 pthread_sigmask(SIG_SETMASK, &oset, 0); 2961 } 2962 // Tell jvm's signal handler the signal is taken care of. 2963 return true; 2964 } 2965 2966 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 2967 bool chained = false; 2968 // signal-chaining 2969 if (UseSignalChaining) { 2970 struct sigaction *actp = get_chained_signal_action(sig); 2971 if (actp != NULL) { 2972 chained = call_chained_handler(actp, sig, siginfo, context); 2973 } 2974 } 2975 return chained; 2976 } 2977 2978 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 2979 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 2980 return &sigact[sig]; 2981 } 2982 return NULL; 2983 } 2984 2985 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 2986 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2987 sigact[sig] = oldAct; 2988 sigs |= (unsigned int)1 << sig; 2989 } 2990 2991 // for diagnostic 2992 int os::Bsd::sigflags[MAXSIGNUM]; 2993 2994 int os::Bsd::get_our_sigflags(int sig) { 2995 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 2996 return sigflags[sig]; 2997 } 2998 2999 void os::Bsd::set_our_sigflags(int sig, int flags) { 3000 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3001 sigflags[sig] = flags; 3002 } 3003 3004 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3005 // Check for overwrite. 3006 struct sigaction oldAct; 3007 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3008 3009 void* oldhand = oldAct.sa_sigaction 3010 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3011 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3012 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3013 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3014 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3015 if (AllowUserSignalHandlers || !set_installed) { 3016 // Do not overwrite; user takes responsibility to forward to us. 3017 return; 3018 } else if (UseSignalChaining) { 3019 // save the old handler in jvm 3020 save_preinstalled_handler(sig, oldAct); 3021 // libjsig also interposes the sigaction() call below and saves the 3022 // old sigaction on it own. 3023 } else { 3024 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3025 "%#lx for signal %d.", (long)oldhand, sig)); 3026 } 3027 } 3028 3029 struct sigaction sigAct; 3030 sigfillset(&(sigAct.sa_mask)); 3031 sigAct.sa_handler = SIG_DFL; 3032 if (!set_installed) { 3033 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3034 } else { 3035 sigAct.sa_sigaction = signalHandler; 3036 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3037 } 3038 // Save flags, which are set by ours 3039 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3040 sigflags[sig] = sigAct.sa_flags; 3041 3042 int ret = sigaction(sig, &sigAct, &oldAct); 3043 assert(ret == 0, "check"); 3044 3045 void* oldhand2 = oldAct.sa_sigaction 3046 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3047 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3048 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3049 } 3050 3051 // install signal handlers for signals that HotSpot needs to 3052 // handle in order to support Java-level exception handling. 3053 3054 void os::Bsd::install_signal_handlers() { 3055 if (!signal_handlers_are_installed) { 3056 signal_handlers_are_installed = true; 3057 3058 // signal-chaining 3059 typedef void (*signal_setting_t)(); 3060 signal_setting_t begin_signal_setting = NULL; 3061 signal_setting_t end_signal_setting = NULL; 3062 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3063 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3064 if (begin_signal_setting != NULL) { 3065 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3066 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3067 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3068 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3069 libjsig_is_loaded = true; 3070 assert(UseSignalChaining, "should enable signal-chaining"); 3071 } 3072 if (libjsig_is_loaded) { 3073 // Tell libjsig jvm is setting signal handlers 3074 (*begin_signal_setting)(); 3075 } 3076 3077 set_signal_handler(SIGSEGV, true); 3078 set_signal_handler(SIGPIPE, true); 3079 set_signal_handler(SIGBUS, true); 3080 set_signal_handler(SIGILL, true); 3081 set_signal_handler(SIGFPE, true); 3082 set_signal_handler(SIGXFSZ, true); 3083 3084 #if defined(__APPLE__) 3085 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3086 // signals caught and handled by the JVM. To work around this, we reset the mach task 3087 // signal handler that's placed on our process by CrashReporter. This disables 3088 // CrashReporter-based reporting. 3089 // 3090 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3091 // on caught fatal signals. 3092 // 3093 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3094 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3095 // exception handling, while leaving the standard BSD signal handlers functional. 3096 kern_return_t kr; 3097 kr = task_set_exception_ports(mach_task_self(), 3098 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3099 MACH_PORT_NULL, 3100 EXCEPTION_STATE_IDENTITY, 3101 MACHINE_THREAD_STATE); 3102 3103 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3104 #endif 3105 3106 if (libjsig_is_loaded) { 3107 // Tell libjsig jvm finishes setting signal handlers 3108 (*end_signal_setting)(); 3109 } 3110 3111 // We don't activate signal checker if libjsig is in place, we trust ourselves 3112 // and if UserSignalHandler is installed all bets are off 3113 if (CheckJNICalls) { 3114 if (libjsig_is_loaded) { 3115 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3116 check_signals = false; 3117 } 3118 if (AllowUserSignalHandlers) { 3119 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3120 check_signals = false; 3121 } 3122 } 3123 } 3124 } 3125 3126 3127 ///// 3128 // glibc on Bsd platform uses non-documented flag 3129 // to indicate, that some special sort of signal 3130 // trampoline is used. 3131 // We will never set this flag, and we should 3132 // ignore this flag in our diagnostic 3133 #ifdef SIGNIFICANT_SIGNAL_MASK 3134 #undef SIGNIFICANT_SIGNAL_MASK 3135 #endif 3136 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3137 3138 static const char* get_signal_handler_name(address handler, 3139 char* buf, int buflen) { 3140 int offset; 3141 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3142 if (found) { 3143 // skip directory names 3144 const char *p1, *p2; 3145 p1 = buf; 3146 size_t len = strlen(os::file_separator()); 3147 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3148 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3149 } else { 3150 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3151 } 3152 return buf; 3153 } 3154 3155 static void print_signal_handler(outputStream* st, int sig, 3156 char* buf, size_t buflen) { 3157 struct sigaction sa; 3158 3159 sigaction(sig, NULL, &sa); 3160 3161 // See comment for SIGNIFICANT_SIGNAL_MASK define 3162 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3163 3164 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3165 3166 address handler = (sa.sa_flags & SA_SIGINFO) 3167 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3168 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3169 3170 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3171 st->print("SIG_DFL"); 3172 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3173 st->print("SIG_IGN"); 3174 } else { 3175 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3176 } 3177 3178 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3179 3180 address rh = VMError::get_resetted_sighandler(sig); 3181 // May be, handler was resetted by VMError? 3182 if(rh != NULL) { 3183 handler = rh; 3184 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3185 } 3186 3187 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3188 3189 // Check: is it our handler? 3190 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3191 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3192 // It is our signal handler 3193 // check for flags, reset system-used one! 3194 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3195 st->print( 3196 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3197 os::Bsd::get_our_sigflags(sig)); 3198 } 3199 } 3200 st->cr(); 3201 } 3202 3203 3204 #define DO_SIGNAL_CHECK(sig) \ 3205 if (!sigismember(&check_signal_done, sig)) \ 3206 os::Bsd::check_signal_handler(sig) 3207 3208 // This method is a periodic task to check for misbehaving JNI applications 3209 // under CheckJNI, we can add any periodic checks here 3210 3211 void os::run_periodic_checks() { 3212 3213 if (check_signals == false) return; 3214 3215 // SEGV and BUS if overridden could potentially prevent 3216 // generation of hs*.log in the event of a crash, debugging 3217 // such a case can be very challenging, so we absolutely 3218 // check the following for a good measure: 3219 DO_SIGNAL_CHECK(SIGSEGV); 3220 DO_SIGNAL_CHECK(SIGILL); 3221 DO_SIGNAL_CHECK(SIGFPE); 3222 DO_SIGNAL_CHECK(SIGBUS); 3223 DO_SIGNAL_CHECK(SIGPIPE); 3224 DO_SIGNAL_CHECK(SIGXFSZ); 3225 3226 3227 // ReduceSignalUsage allows the user to override these handlers 3228 // see comments at the very top and jvm_solaris.h 3229 if (!ReduceSignalUsage) { 3230 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3231 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3232 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3233 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3234 } 3235 3236 DO_SIGNAL_CHECK(SR_signum); 3237 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3238 } 3239 3240 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3241 3242 static os_sigaction_t os_sigaction = NULL; 3243 3244 void os::Bsd::check_signal_handler(int sig) { 3245 char buf[O_BUFLEN]; 3246 address jvmHandler = NULL; 3247 3248 3249 struct sigaction act; 3250 if (os_sigaction == NULL) { 3251 // only trust the default sigaction, in case it has been interposed 3252 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3253 if (os_sigaction == NULL) return; 3254 } 3255 3256 os_sigaction(sig, (struct sigaction*)NULL, &act); 3257 3258 3259 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3260 3261 address thisHandler = (act.sa_flags & SA_SIGINFO) 3262 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3263 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3264 3265 3266 switch(sig) { 3267 case SIGSEGV: 3268 case SIGBUS: 3269 case SIGFPE: 3270 case SIGPIPE: 3271 case SIGILL: 3272 case SIGXFSZ: 3273 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3274 break; 3275 3276 case SHUTDOWN1_SIGNAL: 3277 case SHUTDOWN2_SIGNAL: 3278 case SHUTDOWN3_SIGNAL: 3279 case BREAK_SIGNAL: 3280 jvmHandler = (address)user_handler(); 3281 break; 3282 3283 case INTERRUPT_SIGNAL: 3284 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3285 break; 3286 3287 default: 3288 if (sig == SR_signum) { 3289 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3290 } else { 3291 return; 3292 } 3293 break; 3294 } 3295 3296 if (thisHandler != jvmHandler) { 3297 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3298 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3299 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3300 // No need to check this sig any longer 3301 sigaddset(&check_signal_done, sig); 3302 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3303 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3304 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3305 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3306 // No need to check this sig any longer 3307 sigaddset(&check_signal_done, sig); 3308 } 3309 3310 // Dump all the signal 3311 if (sigismember(&check_signal_done, sig)) { 3312 print_signal_handlers(tty, buf, O_BUFLEN); 3313 } 3314 } 3315 3316 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3317 3318 extern bool signal_name(int signo, char* buf, size_t len); 3319 3320 const char* os::exception_name(int exception_code, char* buf, size_t size) { 3321 if (0 < exception_code && exception_code <= SIGRTMAX) { 3322 // signal 3323 if (!signal_name(exception_code, buf, size)) { 3324 jio_snprintf(buf, size, "SIG%d", exception_code); 3325 } 3326 return buf; 3327 } else { 3328 return NULL; 3329 } 3330 } 3331 3332 // this is called _before_ the most of global arguments have been parsed 3333 void os::init(void) { 3334 char dummy; /* used to get a guess on initial stack address */ 3335 // first_hrtime = gethrtime(); 3336 3337 // With BsdThreads the JavaMain thread pid (primordial thread) 3338 // is different than the pid of the java launcher thread. 3339 // So, on Bsd, the launcher thread pid is passed to the VM 3340 // via the sun.java.launcher.pid property. 3341 // Use this property instead of getpid() if it was correctly passed. 3342 // See bug 6351349. 3343 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3344 3345 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3346 3347 clock_tics_per_sec = CLK_TCK; 3348 3349 init_random(1234567); 3350 3351 ThreadCritical::initialize(); 3352 3353 Bsd::set_page_size(getpagesize()); 3354 if (Bsd::page_size() == -1) { 3355 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3356 strerror(errno))); 3357 } 3358 init_page_sizes((size_t) Bsd::page_size()); 3359 3360 Bsd::initialize_system_info(); 3361 3362 // main_thread points to the aboriginal thread 3363 Bsd::_main_thread = pthread_self(); 3364 3365 Bsd::clock_init(); 3366 initial_time_count = os::elapsed_counter(); 3367 3368 #ifdef __APPLE__ 3369 // XXXDARWIN 3370 // Work around the unaligned VM callbacks in hotspot's 3371 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3372 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3373 // alignment when doing symbol lookup. To work around this, we force early 3374 // binding of all symbols now, thus binding when alignment is known-good. 3375 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3376 #endif 3377 } 3378 3379 // To install functions for atexit system call 3380 extern "C" { 3381 static void perfMemory_exit_helper() { 3382 perfMemory_exit(); 3383 } 3384 } 3385 3386 // this is called _after_ the global arguments have been parsed 3387 jint os::init_2(void) 3388 { 3389 // Allocate a single page and mark it as readable for safepoint polling 3390 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3391 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3392 3393 os::set_polling_page( polling_page ); 3394 3395 #ifndef PRODUCT 3396 if(Verbose && PrintMiscellaneous) 3397 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3398 #endif 3399 3400 if (!UseMembar) { 3401 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3402 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 3403 os::set_memory_serialize_page( mem_serialize_page ); 3404 3405 #ifndef PRODUCT 3406 if(Verbose && PrintMiscellaneous) 3407 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3408 #endif 3409 } 3410 3411 os::large_page_init(); 3412 3413 // initialize suspend/resume support - must do this before signal_sets_init() 3414 if (SR_initialize() != 0) { 3415 perror("SR_initialize failed"); 3416 return JNI_ERR; 3417 } 3418 3419 Bsd::signal_sets_init(); 3420 Bsd::install_signal_handlers(); 3421 3422 // Check minimum allowable stack size for thread creation and to initialize 3423 // the java system classes, including StackOverflowError - depends on page 3424 // size. Add a page for compiler2 recursion in main thread. 3425 // Add in 2*BytesPerWord times page size to account for VM stack during 3426 // class initialization depending on 32 or 64 bit VM. 3427 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3428 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3429 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3430 3431 size_t threadStackSizeInBytes = ThreadStackSize * K; 3432 if (threadStackSizeInBytes != 0 && 3433 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3434 tty->print_cr("\nThe stack size specified is too small, " 3435 "Specify at least %dk", 3436 os::Bsd::min_stack_allowed/ K); 3437 return JNI_ERR; 3438 } 3439 3440 // Make the stack size a multiple of the page size so that 3441 // the yellow/red zones can be guarded. 3442 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3443 vm_page_size())); 3444 3445 if (MaxFDLimit) { 3446 // set the number of file descriptors to max. print out error 3447 // if getrlimit/setrlimit fails but continue regardless. 3448 struct rlimit nbr_files; 3449 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3450 if (status != 0) { 3451 if (PrintMiscellaneous && (Verbose || WizardMode)) 3452 perror("os::init_2 getrlimit failed"); 3453 } else { 3454 nbr_files.rlim_cur = nbr_files.rlim_max; 3455 3456 #ifdef __APPLE__ 3457 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3458 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3459 // be used instead 3460 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3461 #endif 3462 3463 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3464 if (status != 0) { 3465 if (PrintMiscellaneous && (Verbose || WizardMode)) 3466 perror("os::init_2 setrlimit failed"); 3467 } 3468 } 3469 } 3470 3471 // at-exit methods are called in the reverse order of their registration. 3472 // atexit functions are called on return from main or as a result of a 3473 // call to exit(3C). There can be only 32 of these functions registered 3474 // and atexit() does not set errno. 3475 3476 if (PerfAllowAtExitRegistration) { 3477 // only register atexit functions if PerfAllowAtExitRegistration is set. 3478 // atexit functions can be delayed until process exit time, which 3479 // can be problematic for embedded VM situations. Embedded VMs should 3480 // call DestroyJavaVM() to assure that VM resources are released. 3481 3482 // note: perfMemory_exit_helper atexit function may be removed in 3483 // the future if the appropriate cleanup code can be added to the 3484 // VM_Exit VMOperation's doit method. 3485 if (atexit(perfMemory_exit_helper) != 0) { 3486 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3487 } 3488 } 3489 3490 // initialize thread priority policy 3491 prio_init(); 3492 3493 #ifdef __APPLE__ 3494 // dynamically link to objective c gc registration 3495 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3496 if (handleLibObjc != NULL) { 3497 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3498 } 3499 #endif 3500 3501 return JNI_OK; 3502 } 3503 3504 // this is called at the end of vm_initialization 3505 void os::init_3(void) { } 3506 3507 // Mark the polling page as unreadable 3508 void os::make_polling_page_unreadable(void) { 3509 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3510 fatal("Could not disable polling page"); 3511 }; 3512 3513 // Mark the polling page as readable 3514 void os::make_polling_page_readable(void) { 3515 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3516 fatal("Could not enable polling page"); 3517 } 3518 }; 3519 3520 int os::active_processor_count() { 3521 return _processor_count; 3522 } 3523 3524 void os::set_native_thread_name(const char *name) { 3525 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3526 // This is only supported in Snow Leopard and beyond 3527 if (name != NULL) { 3528 // Add a "Java: " prefix to the name 3529 char buf[MAXTHREADNAMESIZE]; 3530 snprintf(buf, sizeof(buf), "Java: %s", name); 3531 pthread_setname_np(buf); 3532 } 3533 #endif 3534 } 3535 3536 bool os::distribute_processes(uint length, uint* distribution) { 3537 // Not yet implemented. 3538 return false; 3539 } 3540 3541 bool os::bind_to_processor(uint processor_id) { 3542 // Not yet implemented. 3543 return false; 3544 } 3545 3546 /// 3547 3548 // Suspends the target using the signal mechanism and then grabs the PC before 3549 // resuming the target. Used by the flat-profiler only 3550 ExtendedPC os::get_thread_pc(Thread* thread) { 3551 // Make sure that it is called by the watcher for the VMThread 3552 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3553 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3554 3555 ExtendedPC epc; 3556 3557 OSThread* osthread = thread->osthread(); 3558 if (do_suspend(osthread)) { 3559 if (osthread->ucontext() != NULL) { 3560 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 3561 } else { 3562 // NULL context is unexpected, double-check this is the VMThread 3563 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3564 } 3565 do_resume(osthread); 3566 } 3567 // failure means pthread_kill failed for some reason - arguably this is 3568 // a fatal problem, but such problems are ignored elsewhere 3569 3570 return epc; 3571 } 3572 3573 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3574 { 3575 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3576 } 3577 3578 //////////////////////////////////////////////////////////////////////////////// 3579 // debug support 3580 3581 static address same_page(address x, address y) { 3582 int page_bits = -os::vm_page_size(); 3583 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 3584 return x; 3585 else if (x > y) 3586 return (address)(intptr_t(y) | ~page_bits) + 1; 3587 else 3588 return (address)(intptr_t(y) & page_bits); 3589 } 3590 3591 bool os::find(address addr, outputStream* st) { 3592 Dl_info dlinfo; 3593 memset(&dlinfo, 0, sizeof(dlinfo)); 3594 if (dladdr(addr, &dlinfo)) { 3595 st->print(PTR_FORMAT ": ", addr); 3596 if (dlinfo.dli_sname != NULL) { 3597 st->print("%s+%#x", dlinfo.dli_sname, 3598 addr - (intptr_t)dlinfo.dli_saddr); 3599 } else if (dlinfo.dli_fname) { 3600 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3601 } else { 3602 st->print("<absolute address>"); 3603 } 3604 if (dlinfo.dli_fname) { 3605 st->print(" in %s", dlinfo.dli_fname); 3606 } 3607 if (dlinfo.dli_fbase) { 3608 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3609 } 3610 st->cr(); 3611 3612 if (Verbose) { 3613 // decode some bytes around the PC 3614 address begin = same_page(addr-40, addr); 3615 address end = same_page(addr+40, addr); 3616 address lowest = (address) dlinfo.dli_sname; 3617 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3618 if (begin < lowest) begin = lowest; 3619 Dl_info dlinfo2; 3620 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 3621 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3622 end = (address) dlinfo2.dli_saddr; 3623 Disassembler::decode(begin, end, st); 3624 } 3625 return true; 3626 } 3627 return false; 3628 } 3629 3630 //////////////////////////////////////////////////////////////////////////////// 3631 // misc 3632 3633 // This does not do anything on Bsd. This is basically a hook for being 3634 // able to use structured exception handling (thread-local exception filters) 3635 // on, e.g., Win32. 3636 void 3637 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3638 JavaCallArguments* args, Thread* thread) { 3639 f(value, method, args, thread); 3640 } 3641 3642 void os::print_statistics() { 3643 } 3644 3645 int os::message_box(const char* title, const char* message) { 3646 int i; 3647 fdStream err(defaultStream::error_fd()); 3648 for (i = 0; i < 78; i++) err.print_raw("="); 3649 err.cr(); 3650 err.print_raw_cr(title); 3651 for (i = 0; i < 78; i++) err.print_raw("-"); 3652 err.cr(); 3653 err.print_raw_cr(message); 3654 for (i = 0; i < 78; i++) err.print_raw("="); 3655 err.cr(); 3656 3657 char buf[16]; 3658 // Prevent process from exiting upon "read error" without consuming all CPU 3659 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3660 3661 return buf[0] == 'y' || buf[0] == 'Y'; 3662 } 3663 3664 int os::stat(const char *path, struct stat *sbuf) { 3665 char pathbuf[MAX_PATH]; 3666 if (strlen(path) > MAX_PATH - 1) { 3667 errno = ENAMETOOLONG; 3668 return -1; 3669 } 3670 os::native_path(strcpy(pathbuf, path)); 3671 return ::stat(pathbuf, sbuf); 3672 } 3673 3674 bool os::check_heap(bool force) { 3675 return true; 3676 } 3677 3678 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3679 return ::vsnprintf(buf, count, format, args); 3680 } 3681 3682 // Is a (classpath) directory empty? 3683 bool os::dir_is_empty(const char* path) { 3684 DIR *dir = NULL; 3685 struct dirent *ptr; 3686 3687 dir = opendir(path); 3688 if (dir == NULL) return true; 3689 3690 /* Scan the directory */ 3691 bool result = true; 3692 char buf[sizeof(struct dirent) + MAX_PATH]; 3693 while (result && (ptr = ::readdir(dir)) != NULL) { 3694 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3695 result = false; 3696 } 3697 } 3698 closedir(dir); 3699 return result; 3700 } 3701 3702 // This code originates from JDK's sysOpen and open64_w 3703 // from src/solaris/hpi/src/system_md.c 3704 3705 #ifndef O_DELETE 3706 #define O_DELETE 0x10000 3707 #endif 3708 3709 // Open a file. Unlink the file immediately after open returns 3710 // if the specified oflag has the O_DELETE flag set. 3711 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3712 3713 int os::open(const char *path, int oflag, int mode) { 3714 3715 if (strlen(path) > MAX_PATH - 1) { 3716 errno = ENAMETOOLONG; 3717 return -1; 3718 } 3719 int fd; 3720 int o_delete = (oflag & O_DELETE); 3721 oflag = oflag & ~O_DELETE; 3722 3723 fd = ::open(path, oflag, mode); 3724 if (fd == -1) return -1; 3725 3726 //If the open succeeded, the file might still be a directory 3727 { 3728 struct stat buf; 3729 int ret = ::fstat(fd, &buf); 3730 int st_mode = buf.st_mode; 3731 3732 if (ret != -1) { 3733 if ((st_mode & S_IFMT) == S_IFDIR) { 3734 errno = EISDIR; 3735 ::close(fd); 3736 return -1; 3737 } 3738 } else { 3739 ::close(fd); 3740 return -1; 3741 } 3742 } 3743 3744 /* 3745 * All file descriptors that are opened in the JVM and not 3746 * specifically destined for a subprocess should have the 3747 * close-on-exec flag set. If we don't set it, then careless 3rd 3748 * party native code might fork and exec without closing all 3749 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3750 * UNIXProcess.c), and this in turn might: 3751 * 3752 * - cause end-of-file to fail to be detected on some file 3753 * descriptors, resulting in mysterious hangs, or 3754 * 3755 * - might cause an fopen in the subprocess to fail on a system 3756 * suffering from bug 1085341. 3757 * 3758 * (Yes, the default setting of the close-on-exec flag is a Unix 3759 * design flaw) 3760 * 3761 * See: 3762 * 1085341: 32-bit stdio routines should support file descriptors >255 3763 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3764 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3765 */ 3766 #ifdef FD_CLOEXEC 3767 { 3768 int flags = ::fcntl(fd, F_GETFD); 3769 if (flags != -1) 3770 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3771 } 3772 #endif 3773 3774 if (o_delete != 0) { 3775 ::unlink(path); 3776 } 3777 return fd; 3778 } 3779 3780 3781 // create binary file, rewriting existing file if required 3782 int os::create_binary_file(const char* path, bool rewrite_existing) { 3783 int oflags = O_WRONLY | O_CREAT; 3784 if (!rewrite_existing) { 3785 oflags |= O_EXCL; 3786 } 3787 return ::open(path, oflags, S_IREAD | S_IWRITE); 3788 } 3789 3790 // return current position of file pointer 3791 jlong os::current_file_offset(int fd) { 3792 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3793 } 3794 3795 // move file pointer to the specified offset 3796 jlong os::seek_to_file_offset(int fd, jlong offset) { 3797 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3798 } 3799 3800 // This code originates from JDK's sysAvailable 3801 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3802 3803 int os::available(int fd, jlong *bytes) { 3804 jlong cur, end; 3805 int mode; 3806 struct stat buf; 3807 3808 if (::fstat(fd, &buf) >= 0) { 3809 mode = buf.st_mode; 3810 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3811 /* 3812 * XXX: is the following call interruptible? If so, this might 3813 * need to go through the INTERRUPT_IO() wrapper as for other 3814 * blocking, interruptible calls in this file. 3815 */ 3816 int n; 3817 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3818 *bytes = n; 3819 return 1; 3820 } 3821 } 3822 } 3823 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3824 return 0; 3825 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3826 return 0; 3827 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3828 return 0; 3829 } 3830 *bytes = end - cur; 3831 return 1; 3832 } 3833 3834 int os::socket_available(int fd, jint *pbytes) { 3835 if (fd < 0) 3836 return OS_OK; 3837 3838 int ret; 3839 3840 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 3841 3842 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 3843 // is expected to return 0 on failure and 1 on success to the jdk. 3844 3845 return (ret == OS_ERR) ? 0 : 1; 3846 } 3847 3848 // Map a block of memory. 3849 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3850 char *addr, size_t bytes, bool read_only, 3851 bool allow_exec) { 3852 int prot; 3853 int flags; 3854 3855 if (read_only) { 3856 prot = PROT_READ; 3857 flags = MAP_SHARED; 3858 } else { 3859 prot = PROT_READ | PROT_WRITE; 3860 flags = MAP_PRIVATE; 3861 } 3862 3863 if (allow_exec) { 3864 prot |= PROT_EXEC; 3865 } 3866 3867 if (addr != NULL) { 3868 flags |= MAP_FIXED; 3869 } 3870 3871 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3872 fd, file_offset); 3873 if (mapped_address == MAP_FAILED) { 3874 return NULL; 3875 } 3876 return mapped_address; 3877 } 3878 3879 3880 // Remap a block of memory. 3881 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3882 char *addr, size_t bytes, bool read_only, 3883 bool allow_exec) { 3884 // same as map_memory() on this OS 3885 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3886 allow_exec); 3887 } 3888 3889 3890 // Unmap a block of memory. 3891 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3892 return munmap(addr, bytes) == 0; 3893 } 3894 3895 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3896 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3897 // of a thread. 3898 // 3899 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3900 // the fast estimate available on the platform. 3901 3902 jlong os::current_thread_cpu_time() { 3903 #ifdef __APPLE__ 3904 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3905 #endif 3906 } 3907 3908 jlong os::thread_cpu_time(Thread* thread) { 3909 } 3910 3911 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3912 #ifdef __APPLE__ 3913 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3914 #endif 3915 } 3916 3917 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3918 #ifdef __APPLE__ 3919 struct thread_basic_info tinfo; 3920 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3921 kern_return_t kr; 3922 thread_t mach_thread; 3923 3924 mach_thread = thread->osthread()->thread_id(); 3925 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3926 if (kr != KERN_SUCCESS) 3927 return -1; 3928 3929 if (user_sys_cpu_time) { 3930 jlong nanos; 3931 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3932 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3933 return nanos; 3934 } else { 3935 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3936 } 3937 #endif 3938 } 3939 3940 3941 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3942 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3943 info_ptr->may_skip_backward = false; // elapsed time not wall time 3944 info_ptr->may_skip_forward = false; // elapsed time not wall time 3945 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3946 } 3947 3948 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3949 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3950 info_ptr->may_skip_backward = false; // elapsed time not wall time 3951 info_ptr->may_skip_forward = false; // elapsed time not wall time 3952 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3953 } 3954 3955 bool os::is_thread_cpu_time_supported() { 3956 #ifdef __APPLE__ 3957 return true; 3958 #else 3959 return false; 3960 #endif 3961 } 3962 3963 // System loadavg support. Returns -1 if load average cannot be obtained. 3964 // Bsd doesn't yet have a (official) notion of processor sets, 3965 // so just return the system wide load average. 3966 int os::loadavg(double loadavg[], int nelem) { 3967 return ::getloadavg(loadavg, nelem); 3968 } 3969 3970 void os::pause() { 3971 char filename[MAX_PATH]; 3972 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3973 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3974 } else { 3975 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3976 } 3977 3978 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3979 if (fd != -1) { 3980 struct stat buf; 3981 ::close(fd); 3982 while (::stat(filename, &buf) == 0) { 3983 (void)::poll(NULL, 0, 100); 3984 } 3985 } else { 3986 jio_fprintf(stderr, 3987 "Could not open pause file '%s', continuing immediately.\n", filename); 3988 } 3989 } 3990 3991 3992 // Refer to the comments in os_solaris.cpp park-unpark. 3993 // 3994 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 3995 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 3996 // For specifics regarding the bug see GLIBC BUGID 261237 : 3997 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 3998 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 3999 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4000 // is used. (The simple C test-case provided in the GLIBC bug report manifests the 4001 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4002 // and monitorenter when we're using 1-0 locking. All those operations may result in 4003 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4004 // of libpthread avoids the problem, but isn't practical. 4005 // 4006 // Possible remedies: 4007 // 4008 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4009 // This is palliative and probabilistic, however. If the thread is preempted 4010 // between the call to compute_abstime() and pthread_cond_timedwait(), more 4011 // than the minimum period may have passed, and the abstime may be stale (in the 4012 // past) resultin in a hang. Using this technique reduces the odds of a hang 4013 // but the JVM is still vulnerable, particularly on heavily loaded systems. 4014 // 4015 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4016 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4017 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4018 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4019 // thread. 4020 // 4021 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4022 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4023 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4024 // This also works well. In fact it avoids kernel-level scalability impediments 4025 // on certain platforms that don't handle lots of active pthread_cond_timedwait() 4026 // timers in a graceful fashion. 4027 // 4028 // 4. When the abstime value is in the past it appears that control returns 4029 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4030 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4031 // can avoid the problem by reinitializing the condvar -- by cond_destroy() 4032 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4033 // It may be possible to avoid reinitialization by checking the return 4034 // value from pthread_cond_timedwait(). In addition to reinitializing the 4035 // condvar we must establish the invariant that cond_signal() is only called 4036 // within critical sections protected by the adjunct mutex. This prevents 4037 // cond_signal() from "seeing" a condvar that's in the midst of being 4038 // reinitialized or that is corrupt. Sadly, this invariant obviates the 4039 // desirable signal-after-unlock optimization that avoids futile context switching. 4040 // 4041 // I'm also concerned that some versions of NTPL might allocate an auxilliary 4042 // structure when a condvar is used or initialized. cond_destroy() would 4043 // release the helper structure. Our reinitialize-after-timedwait fix 4044 // put excessive stress on malloc/free and locks protecting the c-heap. 4045 // 4046 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4047 // It may be possible to refine (4) by checking the kernel and NTPL verisons 4048 // and only enabling the work-around for vulnerable environments. 4049 4050 // utility to compute the abstime argument to timedwait: 4051 // millis is the relative timeout time 4052 // abstime will be the absolute timeout time 4053 // TODO: replace compute_abstime() with unpackTime() 4054 4055 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4056 if (millis < 0) millis = 0; 4057 struct timeval now; 4058 int status = gettimeofday(&now, NULL); 4059 assert(status == 0, "gettimeofday"); 4060 jlong seconds = millis / 1000; 4061 millis %= 1000; 4062 if (seconds > 50000000) { // see man cond_timedwait(3T) 4063 seconds = 50000000; 4064 } 4065 abstime->tv_sec = now.tv_sec + seconds; 4066 long usec = now.tv_usec + millis * 1000; 4067 if (usec >= 1000000) { 4068 abstime->tv_sec += 1; 4069 usec -= 1000000; 4070 } 4071 abstime->tv_nsec = usec * 1000; 4072 return abstime; 4073 } 4074 4075 4076 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4077 // Conceptually TryPark() should be equivalent to park(0). 4078 4079 int os::PlatformEvent::TryPark() { 4080 for (;;) { 4081 const int v = _Event ; 4082 guarantee ((v == 0) || (v == 1), "invariant") ; 4083 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4084 } 4085 } 4086 4087 void os::PlatformEvent::park() { // AKA "down()" 4088 // Invariant: Only the thread associated with the Event/PlatformEvent 4089 // may call park(). 4090 // TODO: assert that _Assoc != NULL or _Assoc == Self 4091 int v ; 4092 for (;;) { 4093 v = _Event ; 4094 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4095 } 4096 guarantee (v >= 0, "invariant") ; 4097 if (v == 0) { 4098 // Do this the hard way by blocking ... 4099 int status = pthread_mutex_lock(_mutex); 4100 assert_status(status == 0, status, "mutex_lock"); 4101 guarantee (_nParked == 0, "invariant") ; 4102 ++ _nParked ; 4103 while (_Event < 0) { 4104 status = pthread_cond_wait(_cond, _mutex); 4105 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4106 // Treat this the same as if the wait was interrupted 4107 if (status == ETIMEDOUT) { status = EINTR; } 4108 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4109 } 4110 -- _nParked ; 4111 4112 // In theory we could move the ST of 0 into _Event past the unlock(), 4113 // but then we'd need a MEMBAR after the ST. 4114 _Event = 0 ; 4115 status = pthread_mutex_unlock(_mutex); 4116 assert_status(status == 0, status, "mutex_unlock"); 4117 } 4118 guarantee (_Event >= 0, "invariant") ; 4119 } 4120 4121 int os::PlatformEvent::park(jlong millis) { 4122 guarantee (_nParked == 0, "invariant") ; 4123 4124 int v ; 4125 for (;;) { 4126 v = _Event ; 4127 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4128 } 4129 guarantee (v >= 0, "invariant") ; 4130 if (v != 0) return OS_OK ; 4131 4132 // We do this the hard way, by blocking the thread. 4133 // Consider enforcing a minimum timeout value. 4134 struct timespec abst; 4135 compute_abstime(&abst, millis); 4136 4137 int ret = OS_TIMEOUT; 4138 int status = pthread_mutex_lock(_mutex); 4139 assert_status(status == 0, status, "mutex_lock"); 4140 guarantee (_nParked == 0, "invariant") ; 4141 ++_nParked ; 4142 4143 // Object.wait(timo) will return because of 4144 // (a) notification 4145 // (b) timeout 4146 // (c) thread.interrupt 4147 // 4148 // Thread.interrupt and object.notify{All} both call Event::set. 4149 // That is, we treat thread.interrupt as a special case of notification. 4150 // The underlying Solaris implementation, cond_timedwait, admits 4151 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4152 // JVM from making those visible to Java code. As such, we must 4153 // filter out spurious wakeups. We assume all ETIME returns are valid. 4154 // 4155 // TODO: properly differentiate simultaneous notify+interrupt. 4156 // In that case, we should propagate the notify to another waiter. 4157 4158 while (_Event < 0) { 4159 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4160 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4161 pthread_cond_destroy (_cond); 4162 pthread_cond_init (_cond, NULL) ; 4163 } 4164 assert_status(status == 0 || status == EINTR || 4165 status == ETIMEDOUT, 4166 status, "cond_timedwait"); 4167 if (!FilterSpuriousWakeups) break ; // previous semantics 4168 if (status == ETIMEDOUT) break ; 4169 // We consume and ignore EINTR and spurious wakeups. 4170 } 4171 --_nParked ; 4172 if (_Event >= 0) { 4173 ret = OS_OK; 4174 } 4175 _Event = 0 ; 4176 status = pthread_mutex_unlock(_mutex); 4177 assert_status(status == 0, status, "mutex_unlock"); 4178 assert (_nParked == 0, "invariant") ; 4179 return ret; 4180 } 4181 4182 void os::PlatformEvent::unpark() { 4183 int v, AnyWaiters ; 4184 for (;;) { 4185 v = _Event ; 4186 if (v > 0) { 4187 // The LD of _Event could have reordered or be satisfied 4188 // by a read-aside from this processor's write buffer. 4189 // To avoid problems execute a barrier and then 4190 // ratify the value. 4191 OrderAccess::fence() ; 4192 if (_Event == v) return ; 4193 continue ; 4194 } 4195 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 4196 } 4197 if (v < 0) { 4198 // Wait for the thread associated with the event to vacate 4199 int status = pthread_mutex_lock(_mutex); 4200 assert_status(status == 0, status, "mutex_lock"); 4201 AnyWaiters = _nParked ; 4202 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 4203 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4204 AnyWaiters = 0 ; 4205 pthread_cond_signal (_cond); 4206 } 4207 status = pthread_mutex_unlock(_mutex); 4208 assert_status(status == 0, status, "mutex_unlock"); 4209 if (AnyWaiters != 0) { 4210 status = pthread_cond_signal(_cond); 4211 assert_status(status == 0, status, "cond_signal"); 4212 } 4213 } 4214 4215 // Note that we signal() _after dropping the lock for "immortal" Events. 4216 // This is safe and avoids a common class of futile wakeups. In rare 4217 // circumstances this can cause a thread to return prematurely from 4218 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4219 // simply re-test the condition and re-park itself. 4220 } 4221 4222 4223 // JSR166 4224 // ------------------------------------------------------- 4225 4226 /* 4227 * The solaris and bsd implementations of park/unpark are fairly 4228 * conservative for now, but can be improved. They currently use a 4229 * mutex/condvar pair, plus a a count. 4230 * Park decrements count if > 0, else does a condvar wait. Unpark 4231 * sets count to 1 and signals condvar. Only one thread ever waits 4232 * on the condvar. Contention seen when trying to park implies that someone 4233 * is unparking you, so don't wait. And spurious returns are fine, so there 4234 * is no need to track notifications. 4235 */ 4236 4237 #define MAX_SECS 100000000 4238 /* 4239 * This code is common to bsd and solaris and will be moved to a 4240 * common place in dolphin. 4241 * 4242 * The passed in time value is either a relative time in nanoseconds 4243 * or an absolute time in milliseconds. Either way it has to be unpacked 4244 * into suitable seconds and nanoseconds components and stored in the 4245 * given timespec structure. 4246 * Given time is a 64-bit value and the time_t used in the timespec is only 4247 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4248 * overflow if times way in the future are given. Further on Solaris versions 4249 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4250 * number of seconds, in abstime, is less than current_time + 100,000,000. 4251 * As it will be 28 years before "now + 100000000" will overflow we can 4252 * ignore overflow and just impose a hard-limit on seconds using the value 4253 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4254 * years from "now". 4255 */ 4256 4257 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4258 assert (time > 0, "convertTime"); 4259 4260 struct timeval now; 4261 int status = gettimeofday(&now, NULL); 4262 assert(status == 0, "gettimeofday"); 4263 4264 time_t max_secs = now.tv_sec + MAX_SECS; 4265 4266 if (isAbsolute) { 4267 jlong secs = time / 1000; 4268 if (secs > max_secs) { 4269 absTime->tv_sec = max_secs; 4270 } 4271 else { 4272 absTime->tv_sec = secs; 4273 } 4274 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4275 } 4276 else { 4277 jlong secs = time / NANOSECS_PER_SEC; 4278 if (secs >= MAX_SECS) { 4279 absTime->tv_sec = max_secs; 4280 absTime->tv_nsec = 0; 4281 } 4282 else { 4283 absTime->tv_sec = now.tv_sec + secs; 4284 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4285 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4286 absTime->tv_nsec -= NANOSECS_PER_SEC; 4287 ++absTime->tv_sec; // note: this must be <= max_secs 4288 } 4289 } 4290 } 4291 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4292 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4293 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4294 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4295 } 4296 4297 void Parker::park(bool isAbsolute, jlong time) { 4298 // Optional fast-path check: 4299 // Return immediately if a permit is available. 4300 if (_counter > 0) { 4301 _counter = 0 ; 4302 OrderAccess::fence(); 4303 return ; 4304 } 4305 4306 Thread* thread = Thread::current(); 4307 assert(thread->is_Java_thread(), "Must be JavaThread"); 4308 JavaThread *jt = (JavaThread *)thread; 4309 4310 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4311 // Check interrupt before trying to wait 4312 if (Thread::is_interrupted(thread, false)) { 4313 return; 4314 } 4315 4316 // Next, demultiplex/decode time arguments 4317 struct timespec absTime; 4318 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4319 return; 4320 } 4321 if (time > 0) { 4322 unpackTime(&absTime, isAbsolute, time); 4323 } 4324 4325 4326 // Enter safepoint region 4327 // Beware of deadlocks such as 6317397. 4328 // The per-thread Parker:: mutex is a classic leaf-lock. 4329 // In particular a thread must never block on the Threads_lock while 4330 // holding the Parker:: mutex. If safepoints are pending both the 4331 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4332 ThreadBlockInVM tbivm(jt); 4333 4334 // Don't wait if cannot get lock since interference arises from 4335 // unblocking. Also. check interrupt before trying wait 4336 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4337 return; 4338 } 4339 4340 int status ; 4341 if (_counter > 0) { // no wait needed 4342 _counter = 0; 4343 status = pthread_mutex_unlock(_mutex); 4344 assert (status == 0, "invariant") ; 4345 OrderAccess::fence(); 4346 return; 4347 } 4348 4349 #ifdef ASSERT 4350 // Don't catch signals while blocked; let the running threads have the signals. 4351 // (This allows a debugger to break into the running thread.) 4352 sigset_t oldsigs; 4353 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4354 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4355 #endif 4356 4357 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4358 jt->set_suspend_equivalent(); 4359 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4360 4361 if (time == 0) { 4362 status = pthread_cond_wait (_cond, _mutex) ; 4363 } else { 4364 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4365 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4366 pthread_cond_destroy (_cond) ; 4367 pthread_cond_init (_cond, NULL); 4368 } 4369 } 4370 assert_status(status == 0 || status == EINTR || 4371 status == ETIMEDOUT, 4372 status, "cond_timedwait"); 4373 4374 #ifdef ASSERT 4375 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4376 #endif 4377 4378 _counter = 0 ; 4379 status = pthread_mutex_unlock(_mutex) ; 4380 assert_status(status == 0, status, "invariant") ; 4381 // If externally suspended while waiting, re-suspend 4382 if (jt->handle_special_suspend_equivalent_condition()) { 4383 jt->java_suspend_self(); 4384 } 4385 4386 OrderAccess::fence(); 4387 } 4388 4389 void Parker::unpark() { 4390 int s, status ; 4391 status = pthread_mutex_lock(_mutex); 4392 assert (status == 0, "invariant") ; 4393 s = _counter; 4394 _counter = 1; 4395 if (s < 1) { 4396 if (WorkAroundNPTLTimedWaitHang) { 4397 status = pthread_cond_signal (_cond) ; 4398 assert (status == 0, "invariant") ; 4399 status = pthread_mutex_unlock(_mutex); 4400 assert (status == 0, "invariant") ; 4401 } else { 4402 status = pthread_mutex_unlock(_mutex); 4403 assert (status == 0, "invariant") ; 4404 status = pthread_cond_signal (_cond) ; 4405 assert (status == 0, "invariant") ; 4406 } 4407 } else { 4408 pthread_mutex_unlock(_mutex); 4409 assert (status == 0, "invariant") ; 4410 } 4411 } 4412 4413 4414 /* Darwin has no "environ" in a dynamic library. */ 4415 #ifdef __APPLE__ 4416 #include <crt_externs.h> 4417 #define environ (*_NSGetEnviron()) 4418 #else 4419 extern char** environ; 4420 #endif 4421 4422 // Run the specified command in a separate process. Return its exit value, 4423 // or -1 on failure (e.g. can't fork a new process). 4424 // Unlike system(), this function can be called from signal handler. It 4425 // doesn't block SIGINT et al. 4426 int os::fork_and_exec(char* cmd) { 4427 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4428 4429 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4430 // pthread_atfork handlers and reset pthread library. All we need is a 4431 // separate process to execve. Make a direct syscall to fork process. 4432 // On IA64 there's no fork syscall, we have to use fork() and hope for 4433 // the best... 4434 pid_t pid = fork(); 4435 4436 if (pid < 0) { 4437 // fork failed 4438 return -1; 4439 4440 } else if (pid == 0) { 4441 // child process 4442 4443 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4444 // first to kill every thread on the thread list. Because this list is 4445 // not reset by fork() (see notes above), execve() will instead kill 4446 // every thread in the parent process. We know this is the only thread 4447 // in the new process, so make a system call directly. 4448 // IA64 should use normal execve() from glibc to match the glibc fork() 4449 // above. 4450 execve("/bin/sh", (char* const*)argv, environ); 4451 4452 // execve failed 4453 _exit(-1); 4454 4455 } else { 4456 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4457 // care about the actual exit code, for now. 4458 4459 int status; 4460 4461 // Wait for the child process to exit. This returns immediately if 4462 // the child has already exited. */ 4463 while (waitpid(pid, &status, 0) < 0) { 4464 switch (errno) { 4465 case ECHILD: return 0; 4466 case EINTR: break; 4467 default: return -1; 4468 } 4469 } 4470 4471 if (WIFEXITED(status)) { 4472 // The child exited normally; get its exit code. 4473 return WEXITSTATUS(status); 4474 } else if (WIFSIGNALED(status)) { 4475 // The child exited because of a signal 4476 // The best value to return is 0x80 + signal number, 4477 // because that is what all Unix shells do, and because 4478 // it allows callers to distinguish between process exit and 4479 // process death by signal. 4480 return 0x80 + WTERMSIG(status); 4481 } else { 4482 // Unknown exit code; pass it through 4483 return status; 4484 } 4485 } 4486 } 4487 4488 // is_headless_jre() 4489 // 4490 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4491 // in order to report if we are running in a headless jre 4492 // 4493 // Since JDK8 xawt/libmawt.so was moved into the same directory 4494 // as libawt.so, and renamed libawt_xawt.so 4495 // 4496 bool os::is_headless_jre() { 4497 struct stat statbuf; 4498 char buf[MAXPATHLEN]; 4499 char libmawtpath[MAXPATHLEN]; 4500 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4501 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4502 char *p; 4503 4504 // Get path to libjvm.so 4505 os::jvm_path(buf, sizeof(buf)); 4506 4507 // Get rid of libjvm.so 4508 p = strrchr(buf, '/'); 4509 if (p == NULL) return false; 4510 else *p = '\0'; 4511 4512 // Get rid of client or server 4513 p = strrchr(buf, '/'); 4514 if (p == NULL) return false; 4515 else *p = '\0'; 4516 4517 // check xawt/libmawt.so 4518 strcpy(libmawtpath, buf); 4519 strcat(libmawtpath, xawtstr); 4520 if (::stat(libmawtpath, &statbuf) == 0) return false; 4521 4522 // check libawt_xawt.so 4523 strcpy(libmawtpath, buf); 4524 strcat(libmawtpath, new_xawtstr); 4525 if (::stat(libmawtpath, &statbuf) == 0) return false; 4526 4527 return true; 4528 } 4529 4530 // Get the default path to the core file 4531 // Returns the length of the string 4532 int os::get_core_path(char* buffer, size_t bufferSize) { 4533 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4534 4535 // Truncate if theoretical string was longer than bufferSize 4536 n = MIN2(n, (int)bufferSize); 4537 4538 return n; 4539 }