1 /* 2 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_bsd.h" 35 #include "logging/log.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/filemap.hpp" 38 #include "mutex_bsd.inline.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "os_bsd.inline.hpp" 41 #include "os_share_bsd.hpp" 42 #include "prims/jniFastGetField.hpp" 43 #include "prims/jvm.h" 44 #include "prims/jvm_misc.hpp" 45 #include "runtime/arguments.hpp" 46 #include "runtime/atomic.inline.hpp" 47 #include "runtime/extendedPC.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/interfaceSupport.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/mutexLocker.hpp" 53 #include "runtime/objectMonitor.hpp" 54 #include "runtime/orderAccess.inline.hpp" 55 #include "runtime/osThread.hpp" 56 #include "runtime/perfMemory.hpp" 57 #include "runtime/sharedRuntime.hpp" 58 #include "runtime/statSampler.hpp" 59 #include "runtime/stubRoutines.hpp" 60 #include "runtime/thread.inline.hpp" 61 #include "runtime/threadCritical.hpp" 62 #include "runtime/timer.hpp" 63 #include "semaphore_bsd.hpp" 64 #include "services/attachListener.hpp" 65 #include "services/memTracker.hpp" 66 #include "services/runtimeService.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/vmError.hpp" 72 73 // put OS-includes here 74 # include <sys/types.h> 75 # include <sys/mman.h> 76 # include <sys/stat.h> 77 # include <sys/select.h> 78 # include <pthread.h> 79 # include <signal.h> 80 # include <errno.h> 81 # include <dlfcn.h> 82 # include <stdio.h> 83 # include <unistd.h> 84 # include <sys/resource.h> 85 # include <pthread.h> 86 # include <sys/stat.h> 87 # include <sys/time.h> 88 # include <sys/times.h> 89 # include <sys/utsname.h> 90 # include <sys/socket.h> 91 # include <sys/wait.h> 92 # include <time.h> 93 # include <pwd.h> 94 # include <poll.h> 95 # include <semaphore.h> 96 # include <fcntl.h> 97 # include <string.h> 98 # include <sys/param.h> 99 # include <sys/sysctl.h> 100 # include <sys/ipc.h> 101 # include <sys/shm.h> 102 #ifndef __APPLE__ 103 # include <link.h> 104 #endif 105 # include <stdint.h> 106 # include <inttypes.h> 107 # include <sys/ioctl.h> 108 # include <sys/syscall.h> 109 110 #if defined(__FreeBSD__) || defined(__NetBSD__) 111 #include <elf.h> 112 #endif 113 114 #ifdef __APPLE__ 115 #include <mach/mach.h> // semaphore_* API 116 #include <mach-o/dyld.h> 117 #include <sys/proc_info.h> 118 #include <objc/objc-auto.h> 119 #endif 120 121 #ifndef MAP_ANONYMOUS 122 #define MAP_ANONYMOUS MAP_ANON 123 #endif 124 125 #define MAX_PATH (2 * K) 126 127 // for timer info max values which include all bits 128 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 129 130 #define LARGEPAGES_BIT (1 << 6) 131 132 //////////////////////////////////////////////////////////////////////////////// 133 // global variables 134 julong os::Bsd::_physical_memory = 0; 135 136 #ifdef __APPLE__ 137 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; 138 volatile uint64_t os::Bsd::_max_abstime = 0; 139 #else 140 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 141 #endif 142 pthread_t os::Bsd::_main_thread; 143 int os::Bsd::_page_size = -1; 144 145 static jlong initial_time_count=0; 146 147 static int clock_tics_per_sec = 100; 148 149 // For diagnostics to print a message once. see run_periodic_checks 150 static sigset_t check_signal_done; 151 static bool check_signals = true; 152 153 static pid_t _initial_pid = 0; 154 155 // Signal number used to suspend/resume a thread 156 157 // do not use any signal number less than SIGSEGV, see 4355769 158 static int SR_signum = SIGUSR2; 159 sigset_t SR_sigset; 160 161 162 //////////////////////////////////////////////////////////////////////////////// 163 // utility functions 164 165 static int SR_initialize(); 166 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 167 168 julong os::available_memory() { 169 return Bsd::available_memory(); 170 } 171 172 // available here means free 173 julong os::Bsd::available_memory() { 174 uint64_t available = physical_memory() >> 2; 175 #ifdef __APPLE__ 176 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; 177 vm_statistics64_data_t vmstat; 178 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, 179 (host_info64_t)&vmstat, &count); 180 assert(kerr == KERN_SUCCESS, 181 "host_statistics64 failed - check mach_host_self() and count"); 182 if (kerr == KERN_SUCCESS) { 183 available = vmstat.free_count * os::vm_page_size(); 184 } 185 #endif 186 return available; 187 } 188 189 julong os::physical_memory() { 190 return Bsd::physical_memory(); 191 } 192 193 // Return true if user is running as root. 194 195 bool os::have_special_privileges() { 196 static bool init = false; 197 static bool privileges = false; 198 if (!init) { 199 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 200 init = true; 201 } 202 return privileges; 203 } 204 205 206 207 // Cpu architecture string 208 #if defined(ZERO) 209 static char cpu_arch[] = ZERO_LIBARCH; 210 #elif defined(IA64) 211 static char cpu_arch[] = "ia64"; 212 #elif defined(IA32) 213 static char cpu_arch[] = "i386"; 214 #elif defined(AMD64) 215 static char cpu_arch[] = "amd64"; 216 #elif defined(ARM) 217 static char cpu_arch[] = "arm"; 218 #elif defined(PPC32) 219 static char cpu_arch[] = "ppc"; 220 #elif defined(SPARC) 221 #ifdef _LP64 222 static char cpu_arch[] = "sparcv9"; 223 #else 224 static char cpu_arch[] = "sparc"; 225 #endif 226 #else 227 #error Add appropriate cpu_arch setting 228 #endif 229 230 // Compiler variant 231 #ifdef COMPILER2 232 #define COMPILER_VARIANT "server" 233 #else 234 #define COMPILER_VARIANT "client" 235 #endif 236 237 238 void os::Bsd::initialize_system_info() { 239 int mib[2]; 240 size_t len; 241 int cpu_val; 242 julong mem_val; 243 244 // get processors count via hw.ncpus sysctl 245 mib[0] = CTL_HW; 246 mib[1] = HW_NCPU; 247 len = sizeof(cpu_val); 248 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 249 assert(len == sizeof(cpu_val), "unexpected data size"); 250 set_processor_count(cpu_val); 251 } else { 252 set_processor_count(1); // fallback 253 } 254 255 // get physical memory via hw.memsize sysctl (hw.memsize is used 256 // since it returns a 64 bit value) 257 mib[0] = CTL_HW; 258 259 #if defined (HW_MEMSIZE) // Apple 260 mib[1] = HW_MEMSIZE; 261 #elif defined(HW_PHYSMEM) // Most of BSD 262 mib[1] = HW_PHYSMEM; 263 #elif defined(HW_REALMEM) // Old FreeBSD 264 mib[1] = HW_REALMEM; 265 #else 266 #error No ways to get physmem 267 #endif 268 269 len = sizeof(mem_val); 270 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 271 assert(len == sizeof(mem_val), "unexpected data size"); 272 _physical_memory = mem_val; 273 } else { 274 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?) 275 } 276 277 #ifdef __OpenBSD__ 278 { 279 // limit _physical_memory memory view on OpenBSD since 280 // datasize rlimit restricts us anyway. 281 struct rlimit limits; 282 getrlimit(RLIMIT_DATA, &limits); 283 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 284 } 285 #endif 286 } 287 288 #ifdef __APPLE__ 289 static const char *get_home() { 290 const char *home_dir = ::getenv("HOME"); 291 if ((home_dir == NULL) || (*home_dir == '\0')) { 292 struct passwd *passwd_info = getpwuid(geteuid()); 293 if (passwd_info != NULL) { 294 home_dir = passwd_info->pw_dir; 295 } 296 } 297 298 return home_dir; 299 } 300 #endif 301 302 void os::init_system_properties_values() { 303 // The next steps are taken in the product version: 304 // 305 // Obtain the JAVA_HOME value from the location of libjvm.so. 306 // This library should be located at: 307 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 308 // 309 // If "/jre/lib/" appears at the right place in the path, then we 310 // assume libjvm.so is installed in a JDK and we use this path. 311 // 312 // Otherwise exit with message: "Could not create the Java virtual machine." 313 // 314 // The following extra steps are taken in the debugging version: 315 // 316 // If "/jre/lib/" does NOT appear at the right place in the path 317 // instead of exit check for $JAVA_HOME environment variable. 318 // 319 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 320 // then we append a fake suffix "hotspot/libjvm.so" to this path so 321 // it looks like libjvm.so is installed there 322 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 323 // 324 // Otherwise exit. 325 // 326 // Important note: if the location of libjvm.so changes this 327 // code needs to be changed accordingly. 328 329 // See ld(1): 330 // The linker uses the following search paths to locate required 331 // shared libraries: 332 // 1: ... 333 // ... 334 // 7: The default directories, normally /lib and /usr/lib. 335 #ifndef DEFAULT_LIBPATH 336 #define DEFAULT_LIBPATH "/lib:/usr/lib" 337 #endif 338 339 // Base path of extensions installed on the system. 340 #define SYS_EXT_DIR "/usr/java/packages" 341 #define EXTENSIONS_DIR "/lib/ext" 342 343 #ifndef __APPLE__ 344 345 // Buffer that fits several sprintfs. 346 // Note that the space for the colon and the trailing null are provided 347 // by the nulls included by the sizeof operator. 348 const size_t bufsize = 349 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 350 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 351 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 352 353 // sysclasspath, java_home, dll_dir 354 { 355 char *pslash; 356 os::jvm_path(buf, bufsize); 357 358 // Found the full path to libjvm.so. 359 // Now cut the path to <java_home>/jre if we can. 360 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 361 pslash = strrchr(buf, '/'); 362 if (pslash != NULL) { 363 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 364 } 365 Arguments::set_dll_dir(buf); 366 367 if (pslash != NULL) { 368 pslash = strrchr(buf, '/'); 369 if (pslash != NULL) { 370 *pslash = '\0'; // Get rid of /<arch>. 371 pslash = strrchr(buf, '/'); 372 if (pslash != NULL) { 373 *pslash = '\0'; // Get rid of /lib. 374 } 375 } 376 } 377 Arguments::set_java_home(buf); 378 set_boot_path('/', ':'); 379 } 380 381 // Where to look for native libraries. 382 // 383 // Note: Due to a legacy implementation, most of the library path 384 // is set in the launcher. This was to accomodate linking restrictions 385 // on legacy Bsd implementations (which are no longer supported). 386 // Eventually, all the library path setting will be done here. 387 // 388 // However, to prevent the proliferation of improperly built native 389 // libraries, the new path component /usr/java/packages is added here. 390 // Eventually, all the library path setting will be done here. 391 { 392 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 393 // should always exist (until the legacy problem cited above is 394 // addressed). 395 const char *v = ::getenv("LD_LIBRARY_PATH"); 396 const char *v_colon = ":"; 397 if (v == NULL) { v = ""; v_colon = ""; } 398 // That's +1 for the colon and +1 for the trailing '\0'. 399 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 400 strlen(v) + 1 + 401 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, 402 mtInternal); 403 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); 404 Arguments::set_library_path(ld_library_path); 405 FREE_C_HEAP_ARRAY(char, ld_library_path); 406 } 407 408 // Extensions directories. 409 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 410 Arguments::set_ext_dirs(buf); 411 412 FREE_C_HEAP_ARRAY(char, buf); 413 414 #else // __APPLE__ 415 416 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 417 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 418 419 const char *user_home_dir = get_home(); 420 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. 421 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 422 sizeof(SYS_EXTENSIONS_DIRS); 423 424 // Buffer that fits several sprintfs. 425 // Note that the space for the colon and the trailing null are provided 426 // by the nulls included by the sizeof operator. 427 const size_t bufsize = 428 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends. 429 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir 430 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 431 432 // sysclasspath, java_home, dll_dir 433 { 434 char *pslash; 435 os::jvm_path(buf, bufsize); 436 437 // Found the full path to libjvm.so. 438 // Now cut the path to <java_home>/jre if we can. 439 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 440 pslash = strrchr(buf, '/'); 441 if (pslash != NULL) { 442 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 443 } 444 #ifdef STATIC_BUILD 445 strcat(buf, "/lib"); 446 #endif 447 448 Arguments::set_dll_dir(buf); 449 450 if (pslash != NULL) { 451 pslash = strrchr(buf, '/'); 452 if (pslash != NULL) { 453 *pslash = '\0'; // Get rid of /lib. 454 } 455 } 456 Arguments::set_java_home(buf); 457 set_boot_path('/', ':'); 458 } 459 460 // Where to look for native libraries. 461 // 462 // Note: Due to a legacy implementation, most of the library path 463 // is set in the launcher. This was to accomodate linking restrictions 464 // on legacy Bsd implementations (which are no longer supported). 465 // Eventually, all the library path setting will be done here. 466 // 467 // However, to prevent the proliferation of improperly built native 468 // libraries, the new path component /usr/java/packages is added here. 469 // Eventually, all the library path setting will be done here. 470 { 471 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It 472 // should always exist (until the legacy problem cited above is 473 // addressed). 474 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code 475 // can specify a directory inside an app wrapper 476 const char *l = ::getenv("JAVA_LIBRARY_PATH"); 477 const char *l_colon = ":"; 478 if (l == NULL) { l = ""; l_colon = ""; } 479 480 const char *v = ::getenv("DYLD_LIBRARY_PATH"); 481 const char *v_colon = ":"; 482 if (v == NULL) { v = ""; v_colon = ""; } 483 484 // Apple's Java6 has "." at the beginning of java.library.path. 485 // OpenJDK on Windows has "." at the end of java.library.path. 486 // OpenJDK on Linux and Solaris don't have "." in java.library.path 487 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 488 // "." is appended to the end of java.library.path. Yes, this 489 // could cause a change in behavior, but Apple's Java6 behavior 490 // can be achieved by putting "." at the beginning of the 491 // JAVA_LIBRARY_PATH environment variable. 492 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, 493 strlen(v) + 1 + strlen(l) + 1 + 494 system_ext_size + 3, 495 mtInternal); 496 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", 497 v, v_colon, l, l_colon, user_home_dir); 498 Arguments::set_library_path(ld_library_path); 499 FREE_C_HEAP_ARRAY(char, ld_library_path); 500 } 501 502 // Extensions directories. 503 // 504 // Note that the space for the colon and the trailing null are provided 505 // by the nulls included by the sizeof operator (so actually one byte more 506 // than necessary is allocated). 507 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, 508 user_home_dir, Arguments::get_java_home()); 509 Arguments::set_ext_dirs(buf); 510 511 FREE_C_HEAP_ARRAY(char, buf); 512 513 #undef SYS_EXTENSIONS_DIR 514 #undef SYS_EXTENSIONS_DIRS 515 516 #endif // __APPLE__ 517 518 #undef SYS_EXT_DIR 519 #undef EXTENSIONS_DIR 520 } 521 522 //////////////////////////////////////////////////////////////////////////////// 523 // breakpoint support 524 525 void os::breakpoint() { 526 BREAKPOINT; 527 } 528 529 extern "C" void breakpoint() { 530 // use debugger to set breakpoint here 531 } 532 533 //////////////////////////////////////////////////////////////////////////////// 534 // signal support 535 536 debug_only(static bool signal_sets_initialized = false); 537 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 538 539 bool os::Bsd::is_sig_ignored(int sig) { 540 struct sigaction oact; 541 sigaction(sig, (struct sigaction*)NULL, &oact); 542 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 543 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 544 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 545 return true; 546 } else { 547 return false; 548 } 549 } 550 551 void os::Bsd::signal_sets_init() { 552 // Should also have an assertion stating we are still single-threaded. 553 assert(!signal_sets_initialized, "Already initialized"); 554 // Fill in signals that are necessarily unblocked for all threads in 555 // the VM. Currently, we unblock the following signals: 556 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 557 // by -Xrs (=ReduceSignalUsage)); 558 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 559 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 560 // the dispositions or masks wrt these signals. 561 // Programs embedding the VM that want to use the above signals for their 562 // own purposes must, at this time, use the "-Xrs" option to prevent 563 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 564 // (See bug 4345157, and other related bugs). 565 // In reality, though, unblocking these signals is really a nop, since 566 // these signals are not blocked by default. 567 sigemptyset(&unblocked_sigs); 568 sigemptyset(&allowdebug_blocked_sigs); 569 sigaddset(&unblocked_sigs, SIGILL); 570 sigaddset(&unblocked_sigs, SIGSEGV); 571 sigaddset(&unblocked_sigs, SIGBUS); 572 sigaddset(&unblocked_sigs, SIGFPE); 573 sigaddset(&unblocked_sigs, SR_signum); 574 575 if (!ReduceSignalUsage) { 576 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 577 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 578 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 579 } 580 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 581 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 582 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 583 } 584 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 585 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 586 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 587 } 588 } 589 // Fill in signals that are blocked by all but the VM thread. 590 sigemptyset(&vm_sigs); 591 if (!ReduceSignalUsage) { 592 sigaddset(&vm_sigs, BREAK_SIGNAL); 593 } 594 debug_only(signal_sets_initialized = true); 595 596 } 597 598 // These are signals that are unblocked while a thread is running Java. 599 // (For some reason, they get blocked by default.) 600 sigset_t* os::Bsd::unblocked_signals() { 601 assert(signal_sets_initialized, "Not initialized"); 602 return &unblocked_sigs; 603 } 604 605 // These are the signals that are blocked while a (non-VM) thread is 606 // running Java. Only the VM thread handles these signals. 607 sigset_t* os::Bsd::vm_signals() { 608 assert(signal_sets_initialized, "Not initialized"); 609 return &vm_sigs; 610 } 611 612 // These are signals that are blocked during cond_wait to allow debugger in 613 sigset_t* os::Bsd::allowdebug_blocked_signals() { 614 assert(signal_sets_initialized, "Not initialized"); 615 return &allowdebug_blocked_sigs; 616 } 617 618 void os::Bsd::hotspot_sigmask(Thread* thread) { 619 620 //Save caller's signal mask before setting VM signal mask 621 sigset_t caller_sigmask; 622 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 623 624 OSThread* osthread = thread->osthread(); 625 osthread->set_caller_sigmask(caller_sigmask); 626 627 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 628 629 if (!ReduceSignalUsage) { 630 if (thread->is_VM_thread()) { 631 // Only the VM thread handles BREAK_SIGNAL ... 632 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 633 } else { 634 // ... all other threads block BREAK_SIGNAL 635 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 636 } 637 } 638 } 639 640 641 ////////////////////////////////////////////////////////////////////////////// 642 // create new thread 643 644 #ifdef __APPLE__ 645 // library handle for calling objc_registerThreadWithCollector() 646 // without static linking to the libobjc library 647 #define OBJC_LIB "/usr/lib/libobjc.dylib" 648 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 649 typedef void (*objc_registerThreadWithCollector_t)(); 650 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 651 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 652 #endif 653 654 #ifdef __APPLE__ 655 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 656 // Additional thread_id used to correlate threads in SA 657 thread_identifier_info_data_t m_ident_info; 658 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 659 660 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 661 (thread_info_t) &m_ident_info, &count); 662 663 return m_ident_info.thread_id; 664 } 665 #endif 666 667 // Thread start routine for all newly created threads 668 static void *thread_native_entry(Thread *thread) { 669 // Try to randomize the cache line index of hot stack frames. 670 // This helps when threads of the same stack traces evict each other's 671 // cache lines. The threads can be either from the same JVM instance, or 672 // from different JVM instances. The benefit is especially true for 673 // processors with hyperthreading technology. 674 static int counter = 0; 675 int pid = os::current_process_id(); 676 alloca(((pid ^ counter++) & 7) * 128); 677 678 thread->initialize_thread_current(); 679 680 OSThread* osthread = thread->osthread(); 681 Monitor* sync = osthread->startThread_lock(); 682 683 osthread->set_thread_id(os::Bsd::gettid()); 684 685 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 686 os::current_thread_id(), (uintx) pthread_self()); 687 688 #ifdef __APPLE__ 689 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 690 guarantee(unique_thread_id != 0, "unique thread id was not found"); 691 osthread->set_unique_thread_id(unique_thread_id); 692 #endif 693 // initialize signal mask for this thread 694 os::Bsd::hotspot_sigmask(thread); 695 696 // initialize floating point control register 697 os::Bsd::init_thread_fpu_state(); 698 699 #ifdef __APPLE__ 700 // register thread with objc gc 701 if (objc_registerThreadWithCollectorFunction != NULL) { 702 objc_registerThreadWithCollectorFunction(); 703 } 704 #endif 705 706 // handshaking with parent thread 707 { 708 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 709 710 // notify parent thread 711 osthread->set_state(INITIALIZED); 712 sync->notify_all(); 713 714 // wait until os::start_thread() 715 while (osthread->get_state() == INITIALIZED) { 716 sync->wait(Mutex::_no_safepoint_check_flag); 717 } 718 } 719 720 // call one more level start routine 721 thread->run(); 722 723 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 724 os::current_thread_id(), (uintx) pthread_self()); 725 726 // If a thread has not deleted itself ("delete this") as part of its 727 // termination sequence, we have to ensure thread-local-storage is 728 // cleared before we actually terminate. No threads should ever be 729 // deleted asynchronously with respect to their termination. 730 if (Thread::current_or_null_safe() != NULL) { 731 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 732 thread->clear_thread_current(); 733 } 734 735 return 0; 736 } 737 738 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 739 assert(thread->osthread() == NULL, "caller responsible"); 740 741 // Allocate the OSThread object 742 OSThread* osthread = new OSThread(NULL, NULL); 743 if (osthread == NULL) { 744 return false; 745 } 746 747 // set the correct thread state 748 osthread->set_thread_type(thr_type); 749 750 // Initial state is ALLOCATED but not INITIALIZED 751 osthread->set_state(ALLOCATED); 752 753 thread->set_osthread(osthread); 754 755 // init thread attributes 756 pthread_attr_t attr; 757 pthread_attr_init(&attr); 758 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 759 760 // calculate stack size if it's not specified by caller 761 if (stack_size == 0) { 762 stack_size = os::Bsd::default_stack_size(thr_type); 763 764 switch (thr_type) { 765 case os::java_thread: 766 // Java threads use ThreadStackSize which default value can be 767 // changed with the flag -Xss 768 assert(JavaThread::stack_size_at_create() > 0, "this should be set"); 769 stack_size = JavaThread::stack_size_at_create(); 770 break; 771 case os::compiler_thread: 772 if (CompilerThreadStackSize > 0) { 773 stack_size = (size_t)(CompilerThreadStackSize * K); 774 break; 775 } // else fall through: 776 // use VMThreadStackSize if CompilerThreadStackSize is not defined 777 case os::vm_thread: 778 case os::pgc_thread: 779 case os::cgc_thread: 780 case os::watcher_thread: 781 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 782 break; 783 } 784 } 785 786 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 787 pthread_attr_setstacksize(&attr, stack_size); 788 789 ThreadState state; 790 791 { 792 pthread_t tid; 793 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 794 795 char buf[64]; 796 if (ret == 0) { 797 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 798 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 799 } else { 800 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 801 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 802 } 803 804 pthread_attr_destroy(&attr); 805 806 if (ret != 0) { 807 // Need to clean up stuff we've allocated so far 808 thread->set_osthread(NULL); 809 delete osthread; 810 return false; 811 } 812 813 // Store pthread info into the OSThread 814 osthread->set_pthread_id(tid); 815 816 // Wait until child thread is either initialized or aborted 817 { 818 Monitor* sync_with_child = osthread->startThread_lock(); 819 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 820 while ((state = osthread->get_state()) == ALLOCATED) { 821 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 822 } 823 } 824 825 } 826 827 // Aborted due to thread limit being reached 828 if (state == ZOMBIE) { 829 thread->set_osthread(NULL); 830 delete osthread; 831 return false; 832 } 833 834 // The thread is returned suspended (in state INITIALIZED), 835 // and is started higher up in the call chain 836 assert(state == INITIALIZED, "race condition"); 837 return true; 838 } 839 840 ///////////////////////////////////////////////////////////////////////////// 841 // attach existing thread 842 843 // bootstrap the main thread 844 bool os::create_main_thread(JavaThread* thread) { 845 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 846 return create_attached_thread(thread); 847 } 848 849 bool os::create_attached_thread(JavaThread* thread) { 850 #ifdef ASSERT 851 thread->verify_not_published(); 852 #endif 853 854 // Allocate the OSThread object 855 OSThread* osthread = new OSThread(NULL, NULL); 856 857 if (osthread == NULL) { 858 return false; 859 } 860 861 osthread->set_thread_id(os::Bsd::gettid()); 862 863 // Store pthread info into the OSThread 864 #ifdef __APPLE__ 865 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 866 guarantee(unique_thread_id != 0, "just checking"); 867 osthread->set_unique_thread_id(unique_thread_id); 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 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 884 os::current_thread_id(), (uintx) pthread_self()); 885 886 return true; 887 } 888 889 void os::pd_start_thread(Thread* thread) { 890 OSThread * osthread = thread->osthread(); 891 assert(osthread->get_state() != INITIALIZED, "just checking"); 892 Monitor* sync_with_child = osthread->startThread_lock(); 893 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 894 sync_with_child->notify(); 895 } 896 897 // Free Bsd resources related to the OSThread 898 void os::free_thread(OSThread* osthread) { 899 assert(osthread != NULL, "osthread not set"); 900 901 // We are told to free resources of the argument thread, 902 // but we can only really operate on the current thread. 903 assert(Thread::current()->osthread() == osthread, 904 "os::free_thread but not current thread"); 905 906 // Restore caller's signal mask 907 sigset_t sigmask = osthread->caller_sigmask(); 908 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 909 910 delete osthread; 911 } 912 913 //////////////////////////////////////////////////////////////////////////////// 914 // time support 915 916 // Time since start-up in seconds to a fine granularity. 917 // Used by VMSelfDestructTimer and the MemProfiler. 918 double os::elapsedTime() { 919 920 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 921 } 922 923 jlong os::elapsed_counter() { 924 return javaTimeNanos() - initial_time_count; 925 } 926 927 jlong os::elapsed_frequency() { 928 return NANOSECS_PER_SEC; // nanosecond resolution 929 } 930 931 bool os::supports_vtime() { return true; } 932 bool os::enable_vtime() { return false; } 933 bool os::vtime_enabled() { return false; } 934 935 double os::elapsedVTime() { 936 // better than nothing, but not much 937 return elapsedTime(); 938 } 939 940 jlong os::javaTimeMillis() { 941 timeval time; 942 int status = gettimeofday(&time, NULL); 943 assert(status != -1, "bsd error"); 944 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 945 } 946 947 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 948 timeval time; 949 int status = gettimeofday(&time, NULL); 950 assert(status != -1, "bsd error"); 951 seconds = jlong(time.tv_sec); 952 nanos = jlong(time.tv_usec) * 1000; 953 } 954 955 #ifndef __APPLE__ 956 #ifndef CLOCK_MONOTONIC 957 #define CLOCK_MONOTONIC (1) 958 #endif 959 #endif 960 961 #ifdef __APPLE__ 962 void os::Bsd::clock_init() { 963 mach_timebase_info(&_timebase_info); 964 } 965 #else 966 void os::Bsd::clock_init() { 967 struct timespec res; 968 struct timespec tp; 969 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 970 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 971 // yes, monotonic clock is supported 972 _clock_gettime = ::clock_gettime; 973 } 974 } 975 #endif 976 977 978 979 #ifdef __APPLE__ 980 981 jlong os::javaTimeNanos() { 982 const uint64_t tm = mach_absolute_time(); 983 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 984 const uint64_t prev = Bsd::_max_abstime; 985 if (now <= prev) { 986 return prev; // same or retrograde time; 987 } 988 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev); 989 assert(obsv >= prev, "invariant"); // Monotonicity 990 // If the CAS succeeded then we're done and return "now". 991 // If the CAS failed and the observed value "obsv" is >= now then 992 // we should return "obsv". If the CAS failed and now > obsv > prv then 993 // some other thread raced this thread and installed a new value, in which case 994 // we could either (a) retry the entire operation, (b) retry trying to install now 995 // or (c) just return obsv. We use (c). No loop is required although in some cases 996 // we might discard a higher "now" value in deference to a slightly lower but freshly 997 // installed obsv value. That's entirely benign -- it admits no new orderings compared 998 // to (a) or (b) -- and greatly reduces coherence traffic. 999 // We might also condition (c) on the magnitude of the delta between obsv and now. 1000 // Avoiding excessive CAS operations to hot RW locations is critical. 1001 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1002 return (prev == obsv) ? now : obsv; 1003 } 1004 1005 #else // __APPLE__ 1006 1007 jlong os::javaTimeNanos() { 1008 if (os::supports_monotonic_clock()) { 1009 struct timespec tp; 1010 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 1011 assert(status == 0, "gettime error"); 1012 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 1013 return result; 1014 } else { 1015 timeval time; 1016 int status = gettimeofday(&time, NULL); 1017 assert(status != -1, "bsd error"); 1018 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1019 return 1000 * usecs; 1020 } 1021 } 1022 1023 #endif // __APPLE__ 1024 1025 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1026 if (os::supports_monotonic_clock()) { 1027 info_ptr->max_value = ALL_64_BITS; 1028 1029 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1030 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1031 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1032 } else { 1033 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1034 info_ptr->max_value = ALL_64_BITS; 1035 1036 // gettimeofday is a real time clock so it skips 1037 info_ptr->may_skip_backward = true; 1038 info_ptr->may_skip_forward = true; 1039 } 1040 1041 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1042 } 1043 1044 // Return the real, user, and system times in seconds from an 1045 // arbitrary fixed point in the past. 1046 bool os::getTimesSecs(double* process_real_time, 1047 double* process_user_time, 1048 double* process_system_time) { 1049 struct tms ticks; 1050 clock_t real_ticks = times(&ticks); 1051 1052 if (real_ticks == (clock_t) (-1)) { 1053 return false; 1054 } else { 1055 double ticks_per_second = (double) clock_tics_per_sec; 1056 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1057 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1058 *process_real_time = ((double) real_ticks) / ticks_per_second; 1059 1060 return true; 1061 } 1062 } 1063 1064 1065 char * os::local_time_string(char *buf, size_t buflen) { 1066 struct tm t; 1067 time_t long_time; 1068 time(&long_time); 1069 localtime_r(&long_time, &t); 1070 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1071 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1072 t.tm_hour, t.tm_min, t.tm_sec); 1073 return buf; 1074 } 1075 1076 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1077 return localtime_r(clock, res); 1078 } 1079 1080 //////////////////////////////////////////////////////////////////////////////// 1081 // runtime exit support 1082 1083 // Note: os::shutdown() might be called very early during initialization, or 1084 // called from signal handler. Before adding something to os::shutdown(), make 1085 // sure it is async-safe and can handle partially initialized VM. 1086 void os::shutdown() { 1087 1088 // allow PerfMemory to attempt cleanup of any persistent resources 1089 perfMemory_exit(); 1090 1091 // needs to remove object in file system 1092 AttachListener::abort(); 1093 1094 // flush buffered output, finish log files 1095 ostream_abort(); 1096 1097 // Check for abort hook 1098 abort_hook_t abort_hook = Arguments::abort_hook(); 1099 if (abort_hook != NULL) { 1100 abort_hook(); 1101 } 1102 1103 } 1104 1105 // Note: os::abort() might be called very early during initialization, or 1106 // called from signal handler. Before adding something to os::abort(), make 1107 // sure it is async-safe and can handle partially initialized VM. 1108 void os::abort(bool dump_core, void* siginfo, const void* context) { 1109 os::shutdown(); 1110 if (dump_core) { 1111 #ifndef PRODUCT 1112 fdStream out(defaultStream::output_fd()); 1113 out.print_raw("Current thread is "); 1114 char buf[16]; 1115 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1116 out.print_raw_cr(buf); 1117 out.print_raw_cr("Dumping core ..."); 1118 #endif 1119 ::abort(); // dump core 1120 } 1121 1122 ::exit(1); 1123 } 1124 1125 // Die immediately, no exit hook, no abort hook, no cleanup. 1126 void os::die() { 1127 // _exit() on BsdThreads only kills current thread 1128 ::abort(); 1129 } 1130 1131 // This method is a copy of JDK's sysGetLastErrorString 1132 // from src/solaris/hpi/src/system_md.c 1133 1134 size_t os::lasterror(char *buf, size_t len) { 1135 if (errno == 0) return 0; 1136 1137 const char *s = os::strerror(errno); 1138 size_t n = ::strlen(s); 1139 if (n >= len) { 1140 n = len - 1; 1141 } 1142 ::strncpy(buf, s, n); 1143 buf[n] = '\0'; 1144 return n; 1145 } 1146 1147 // Information of current thread in variety of formats 1148 pid_t os::Bsd::gettid() { 1149 int retval = -1; 1150 1151 #ifdef __APPLE__ //XNU kernel 1152 // despite the fact mach port is actually not a thread id use it 1153 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1154 retval = ::pthread_mach_thread_np(::pthread_self()); 1155 guarantee(retval != 0, "just checking"); 1156 return retval; 1157 1158 #else 1159 #ifdef __FreeBSD__ 1160 retval = syscall(SYS_thr_self); 1161 #else 1162 #ifdef __OpenBSD__ 1163 retval = syscall(SYS_getthrid); 1164 #else 1165 #ifdef __NetBSD__ 1166 retval = (pid_t) syscall(SYS__lwp_self); 1167 #endif 1168 #endif 1169 #endif 1170 #endif 1171 1172 if (retval == -1) { 1173 return getpid(); 1174 } 1175 } 1176 1177 intx os::current_thread_id() { 1178 #ifdef __APPLE__ 1179 return (intx)::pthread_mach_thread_np(::pthread_self()); 1180 #else 1181 return (intx)::pthread_self(); 1182 #endif 1183 } 1184 1185 int os::current_process_id() { 1186 1187 // Under the old bsd thread library, bsd gives each thread 1188 // its own process id. Because of this each thread will return 1189 // a different pid if this method were to return the result 1190 // of getpid(2). Bsd provides no api that returns the pid 1191 // of the launcher thread for the vm. This implementation 1192 // returns a unique pid, the pid of the launcher thread 1193 // that starts the vm 'process'. 1194 1195 // Under the NPTL, getpid() returns the same pid as the 1196 // launcher thread rather than a unique pid per thread. 1197 // Use gettid() if you want the old pre NPTL behaviour. 1198 1199 // if you are looking for the result of a call to getpid() that 1200 // returns a unique pid for the calling thread, then look at the 1201 // OSThread::thread_id() method in osThread_bsd.hpp file 1202 1203 return (int)(_initial_pid ? _initial_pid : getpid()); 1204 } 1205 1206 // DLL functions 1207 1208 #define JNI_LIB_PREFIX "lib" 1209 #ifdef __APPLE__ 1210 #define JNI_LIB_SUFFIX ".dylib" 1211 #else 1212 #define JNI_LIB_SUFFIX ".so" 1213 #endif 1214 1215 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1216 1217 // This must be hard coded because it's the system's temporary 1218 // directory not the java application's temp directory, ala java.io.tmpdir. 1219 #ifdef __APPLE__ 1220 // macosx has a secure per-user temporary directory 1221 char temp_path_storage[PATH_MAX]; 1222 const char* os::get_temp_directory() { 1223 static char *temp_path = NULL; 1224 if (temp_path == NULL) { 1225 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1226 if (pathSize == 0 || pathSize > PATH_MAX) { 1227 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1228 } 1229 temp_path = temp_path_storage; 1230 } 1231 return temp_path; 1232 } 1233 #else // __APPLE__ 1234 const char* os::get_temp_directory() { return "/tmp"; } 1235 #endif // __APPLE__ 1236 1237 static bool file_exists(const char* filename) { 1238 struct stat statbuf; 1239 if (filename == NULL || strlen(filename) == 0) { 1240 return false; 1241 } 1242 return os::stat(filename, &statbuf) == 0; 1243 } 1244 1245 bool os::dll_build_name(char* buffer, size_t buflen, 1246 const char* pname, const char* fname) { 1247 bool retval = false; 1248 // Copied from libhpi 1249 const size_t pnamelen = pname ? strlen(pname) : 0; 1250 1251 // Return error on buffer overflow. 1252 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1253 return retval; 1254 } 1255 1256 if (pnamelen == 0) { 1257 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1258 retval = true; 1259 } else if (strchr(pname, *os::path_separator()) != NULL) { 1260 int n; 1261 char** pelements = split_path(pname, &n); 1262 if (pelements == NULL) { 1263 return false; 1264 } 1265 for (int i = 0; i < n; i++) { 1266 // Really shouldn't be NULL, but check can't hurt 1267 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1268 continue; // skip the empty path values 1269 } 1270 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1271 pelements[i], fname); 1272 if (file_exists(buffer)) { 1273 retval = true; 1274 break; 1275 } 1276 } 1277 // release the storage 1278 for (int i = 0; i < n; i++) { 1279 if (pelements[i] != NULL) { 1280 FREE_C_HEAP_ARRAY(char, pelements[i]); 1281 } 1282 } 1283 if (pelements != NULL) { 1284 FREE_C_HEAP_ARRAY(char*, pelements); 1285 } 1286 } else { 1287 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1288 retval = true; 1289 } 1290 return retval; 1291 } 1292 1293 // check if addr is inside libjvm.so 1294 bool os::address_is_in_vm(address addr) { 1295 static address libjvm_base_addr; 1296 Dl_info dlinfo; 1297 1298 if (libjvm_base_addr == NULL) { 1299 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1300 libjvm_base_addr = (address)dlinfo.dli_fbase; 1301 } 1302 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1303 } 1304 1305 if (dladdr((void *)addr, &dlinfo) != 0) { 1306 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1307 } 1308 1309 return false; 1310 } 1311 1312 1313 #define MACH_MAXSYMLEN 256 1314 1315 bool os::dll_address_to_function_name(address addr, char *buf, 1316 int buflen, int *offset, 1317 bool demangle) { 1318 // buf is not optional, but offset is optional 1319 assert(buf != NULL, "sanity check"); 1320 1321 Dl_info dlinfo; 1322 char localbuf[MACH_MAXSYMLEN]; 1323 1324 if (dladdr((void*)addr, &dlinfo) != 0) { 1325 // see if we have a matching symbol 1326 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1327 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1328 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1329 } 1330 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1331 return true; 1332 } 1333 // no matching symbol so try for just file info 1334 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1335 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1336 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1337 return true; 1338 } 1339 } 1340 1341 // Handle non-dynamic manually: 1342 if (dlinfo.dli_fbase != NULL && 1343 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1344 dlinfo.dli_fbase)) { 1345 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1346 jio_snprintf(buf, buflen, "%s", localbuf); 1347 } 1348 return true; 1349 } 1350 } 1351 buf[0] = '\0'; 1352 if (offset != NULL) *offset = -1; 1353 return false; 1354 } 1355 1356 // ported from solaris version 1357 bool os::dll_address_to_library_name(address addr, char* buf, 1358 int buflen, int* offset) { 1359 // buf is not optional, but offset is optional 1360 assert(buf != NULL, "sanity check"); 1361 1362 Dl_info dlinfo; 1363 1364 if (dladdr((void*)addr, &dlinfo) != 0) { 1365 if (dlinfo.dli_fname != NULL) { 1366 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1367 } 1368 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1369 *offset = addr - (address)dlinfo.dli_fbase; 1370 } 1371 return true; 1372 } 1373 1374 buf[0] = '\0'; 1375 if (offset) *offset = -1; 1376 return false; 1377 } 1378 1379 // Loads .dll/.so and 1380 // in case of error it checks if .dll/.so was built for the 1381 // same architecture as Hotspot is running on 1382 1383 #ifdef __APPLE__ 1384 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1385 #ifdef STATIC_BUILD 1386 return os::get_default_process_handle(); 1387 #else 1388 void * result= ::dlopen(filename, RTLD_LAZY); 1389 if (result != NULL) { 1390 // Successful loading 1391 return result; 1392 } 1393 1394 // Read system error message into ebuf 1395 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1396 ebuf[ebuflen-1]='\0'; 1397 1398 return NULL; 1399 #endif // STATIC_BUILD 1400 } 1401 #else 1402 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1403 #ifdef STATIC_BUILD 1404 return os::get_default_process_handle(); 1405 #else 1406 void * result= ::dlopen(filename, RTLD_LAZY); 1407 if (result != NULL) { 1408 // Successful loading 1409 return result; 1410 } 1411 1412 Elf32_Ehdr elf_head; 1413 1414 // Read system error message into ebuf 1415 // It may or may not be overwritten below 1416 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1417 ebuf[ebuflen-1]='\0'; 1418 int diag_msg_max_length=ebuflen-strlen(ebuf); 1419 char* diag_msg_buf=ebuf+strlen(ebuf); 1420 1421 if (diag_msg_max_length==0) { 1422 // No more space in ebuf for additional diagnostics message 1423 return NULL; 1424 } 1425 1426 1427 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1428 1429 if (file_descriptor < 0) { 1430 // Can't open library, report dlerror() message 1431 return NULL; 1432 } 1433 1434 bool failed_to_read_elf_head= 1435 (sizeof(elf_head)!= 1436 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1437 1438 ::close(file_descriptor); 1439 if (failed_to_read_elf_head) { 1440 // file i/o error - report dlerror() msg 1441 return NULL; 1442 } 1443 1444 typedef struct { 1445 Elf32_Half code; // Actual value as defined in elf.h 1446 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1447 char elf_class; // 32 or 64 bit 1448 char endianess; // MSB or LSB 1449 char* name; // String representation 1450 } arch_t; 1451 1452 #ifndef EM_486 1453 #define EM_486 6 /* Intel 80486 */ 1454 #endif 1455 1456 #ifndef EM_MIPS_RS3_LE 1457 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1458 #endif 1459 1460 #ifndef EM_PPC64 1461 #define EM_PPC64 21 /* PowerPC64 */ 1462 #endif 1463 1464 #ifndef EM_S390 1465 #define EM_S390 22 /* IBM System/390 */ 1466 #endif 1467 1468 #ifndef EM_IA_64 1469 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1470 #endif 1471 1472 #ifndef EM_X86_64 1473 #define EM_X86_64 62 /* AMD x86-64 */ 1474 #endif 1475 1476 static const arch_t arch_array[]={ 1477 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1478 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1479 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1480 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1481 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1482 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1483 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1484 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1485 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1486 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1487 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1488 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1489 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1490 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1491 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1492 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1493 }; 1494 1495 #if (defined IA32) 1496 static Elf32_Half running_arch_code=EM_386; 1497 #elif (defined AMD64) 1498 static Elf32_Half running_arch_code=EM_X86_64; 1499 #elif (defined IA64) 1500 static Elf32_Half running_arch_code=EM_IA_64; 1501 #elif (defined __sparc) && (defined _LP64) 1502 static Elf32_Half running_arch_code=EM_SPARCV9; 1503 #elif (defined __sparc) && (!defined _LP64) 1504 static Elf32_Half running_arch_code=EM_SPARC; 1505 #elif (defined __powerpc64__) 1506 static Elf32_Half running_arch_code=EM_PPC64; 1507 #elif (defined __powerpc__) 1508 static Elf32_Half running_arch_code=EM_PPC; 1509 #elif (defined ARM) 1510 static Elf32_Half running_arch_code=EM_ARM; 1511 #elif (defined S390) 1512 static Elf32_Half running_arch_code=EM_S390; 1513 #elif (defined ALPHA) 1514 static Elf32_Half running_arch_code=EM_ALPHA; 1515 #elif (defined MIPSEL) 1516 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1517 #elif (defined PARISC) 1518 static Elf32_Half running_arch_code=EM_PARISC; 1519 #elif (defined MIPS) 1520 static Elf32_Half running_arch_code=EM_MIPS; 1521 #elif (defined M68K) 1522 static Elf32_Half running_arch_code=EM_68K; 1523 #else 1524 #error Method os::dll_load requires that one of following is defined:\ 1525 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1526 #endif 1527 1528 // Identify compatability class for VM's architecture and library's architecture 1529 // Obtain string descriptions for architectures 1530 1531 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1532 int running_arch_index=-1; 1533 1534 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1535 if (running_arch_code == arch_array[i].code) { 1536 running_arch_index = i; 1537 } 1538 if (lib_arch.code == arch_array[i].code) { 1539 lib_arch.compat_class = arch_array[i].compat_class; 1540 lib_arch.name = arch_array[i].name; 1541 } 1542 } 1543 1544 assert(running_arch_index != -1, 1545 "Didn't find running architecture code (running_arch_code) in arch_array"); 1546 if (running_arch_index == -1) { 1547 // Even though running architecture detection failed 1548 // we may still continue with reporting dlerror() message 1549 return NULL; 1550 } 1551 1552 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1553 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1554 return NULL; 1555 } 1556 1557 #ifndef S390 1558 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1559 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1560 return NULL; 1561 } 1562 #endif // !S390 1563 1564 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1565 if (lib_arch.name!=NULL) { 1566 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1567 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1568 lib_arch.name, arch_array[running_arch_index].name); 1569 } else { 1570 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1571 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1572 lib_arch.code, 1573 arch_array[running_arch_index].name); 1574 } 1575 } 1576 1577 return NULL; 1578 #endif // STATIC_BUILD 1579 } 1580 #endif // !__APPLE__ 1581 1582 void* os::get_default_process_handle() { 1583 #ifdef __APPLE__ 1584 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1585 // to avoid finding unexpected symbols on second (or later) 1586 // loads of a library. 1587 return (void*)::dlopen(NULL, RTLD_FIRST); 1588 #else 1589 return (void*)::dlopen(NULL, RTLD_LAZY); 1590 #endif 1591 } 1592 1593 // XXX: Do we need a lock around this as per Linux? 1594 void* os::dll_lookup(void* handle, const char* name) { 1595 return dlsym(handle, name); 1596 } 1597 1598 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1599 outputStream * out = (outputStream *) param; 1600 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1601 return 0; 1602 } 1603 1604 void os::print_dll_info(outputStream *st) { 1605 st->print_cr("Dynamic libraries:"); 1606 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1607 st->print_cr("Error: Cannot print dynamic libraries."); 1608 } 1609 } 1610 1611 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1612 #ifdef RTLD_DI_LINKMAP 1613 Dl_info dli; 1614 void *handle; 1615 Link_map *map; 1616 Link_map *p; 1617 1618 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1619 dli.dli_fname == NULL) { 1620 return 1; 1621 } 1622 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1623 if (handle == NULL) { 1624 return 1; 1625 } 1626 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1627 if (map == NULL) { 1628 dlclose(handle); 1629 return 1; 1630 } 1631 1632 while (map->l_prev != NULL) 1633 map = map->l_prev; 1634 1635 while (map != NULL) { 1636 // Value for top_address is returned as 0 since we don't have any information about module size 1637 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1638 dlclose(handle); 1639 return 1; 1640 } 1641 map = map->l_next; 1642 } 1643 1644 dlclose(handle); 1645 #elif defined(__APPLE__) 1646 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1647 // Value for top_address is returned as 0 since we don't have any information about module size 1648 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1649 return 1; 1650 } 1651 } 1652 return 0; 1653 #else 1654 return 1; 1655 #endif 1656 } 1657 1658 void os::get_summary_os_info(char* buf, size_t buflen) { 1659 // These buffers are small because we want this to be brief 1660 // and not use a lot of stack while generating the hs_err file. 1661 char os[100]; 1662 size_t size = sizeof(os); 1663 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1664 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1665 #ifdef __APPLE__ 1666 strncpy(os, "Darwin", sizeof(os)); 1667 #elif __OpenBSD__ 1668 strncpy(os, "OpenBSD", sizeof(os)); 1669 #else 1670 strncpy(os, "BSD", sizeof(os)); 1671 #endif 1672 } 1673 1674 char release[100]; 1675 size = sizeof(release); 1676 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1677 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1678 // if error, leave blank 1679 strncpy(release, "", sizeof(release)); 1680 } 1681 snprintf(buf, buflen, "%s %s", os, release); 1682 } 1683 1684 void os::print_os_info_brief(outputStream* st) { 1685 os::Posix::print_uname_info(st); 1686 } 1687 1688 void os::print_os_info(outputStream* st) { 1689 st->print("OS:"); 1690 1691 os::Posix::print_uname_info(st); 1692 1693 os::Posix::print_rlimit_info(st); 1694 1695 os::Posix::print_load_average(st); 1696 } 1697 1698 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1699 // Nothing to do for now. 1700 } 1701 1702 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1703 unsigned int mhz; 1704 size_t size = sizeof(mhz); 1705 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1706 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1707 mhz = 1; // looks like an error but can be divided by 1708 } else { 1709 mhz /= 1000000; // reported in millions 1710 } 1711 1712 char model[100]; 1713 size = sizeof(model); 1714 int mib_model[] = { CTL_HW, HW_MODEL }; 1715 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1716 strncpy(model, cpu_arch, sizeof(model)); 1717 } 1718 1719 char machine[100]; 1720 size = sizeof(machine); 1721 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1722 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1723 strncpy(machine, "", sizeof(machine)); 1724 } 1725 1726 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1727 } 1728 1729 void os::print_memory_info(outputStream* st) { 1730 1731 st->print("Memory:"); 1732 st->print(" %dk page", os::vm_page_size()>>10); 1733 1734 st->print(", physical " UINT64_FORMAT "k", 1735 os::physical_memory() >> 10); 1736 st->print("(" UINT64_FORMAT "k free)", 1737 os::available_memory() >> 10); 1738 st->cr(); 1739 } 1740 1741 static void print_signal_handler(outputStream* st, int sig, 1742 char* buf, size_t buflen); 1743 1744 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1745 st->print_cr("Signal Handlers:"); 1746 print_signal_handler(st, SIGSEGV, buf, buflen); 1747 print_signal_handler(st, SIGBUS , buf, buflen); 1748 print_signal_handler(st, SIGFPE , buf, buflen); 1749 print_signal_handler(st, SIGPIPE, buf, buflen); 1750 print_signal_handler(st, SIGXFSZ, buf, buflen); 1751 print_signal_handler(st, SIGILL , buf, buflen); 1752 print_signal_handler(st, SR_signum, buf, buflen); 1753 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1754 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1755 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1756 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1757 } 1758 1759 static char saved_jvm_path[MAXPATHLEN] = {0}; 1760 1761 // Find the full path to the current module, libjvm 1762 void os::jvm_path(char *buf, jint buflen) { 1763 // Error checking. 1764 if (buflen < MAXPATHLEN) { 1765 assert(false, "must use a large-enough buffer"); 1766 buf[0] = '\0'; 1767 return; 1768 } 1769 // Lazy resolve the path to current module. 1770 if (saved_jvm_path[0] != 0) { 1771 strcpy(buf, saved_jvm_path); 1772 return; 1773 } 1774 1775 char dli_fname[MAXPATHLEN]; 1776 bool ret = dll_address_to_library_name( 1777 CAST_FROM_FN_PTR(address, os::jvm_path), 1778 dli_fname, sizeof(dli_fname), NULL); 1779 assert(ret, "cannot locate libjvm"); 1780 char *rp = NULL; 1781 if (ret && dli_fname[0] != '\0') { 1782 rp = realpath(dli_fname, buf); 1783 } 1784 if (rp == NULL) { 1785 return; 1786 } 1787 1788 if (Arguments::sun_java_launcher_is_altjvm()) { 1789 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1790 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1791 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1792 // appears at the right place in the string, then assume we are 1793 // installed in a JDK and we're done. Otherwise, check for a 1794 // JAVA_HOME environment variable and construct a path to the JVM 1795 // being overridden. 1796 1797 const char *p = buf + strlen(buf) - 1; 1798 for (int count = 0; p > buf && count < 5; ++count) { 1799 for (--p; p > buf && *p != '/'; --p) 1800 /* empty */ ; 1801 } 1802 1803 if (strncmp(p, "/jre/lib/", 9) != 0) { 1804 // Look for JAVA_HOME in the environment. 1805 char* java_home_var = ::getenv("JAVA_HOME"); 1806 if (java_home_var != NULL && java_home_var[0] != 0) { 1807 char* jrelib_p; 1808 int len; 1809 1810 // Check the current module name "libjvm" 1811 p = strrchr(buf, '/'); 1812 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1813 1814 rp = realpath(java_home_var, buf); 1815 if (rp == NULL) { 1816 return; 1817 } 1818 1819 // determine if this is a legacy image or modules image 1820 // modules image doesn't have "jre" subdirectory 1821 len = strlen(buf); 1822 assert(len < buflen, "Ran out of buffer space"); 1823 jrelib_p = buf + len; 1824 1825 // Add the appropriate library subdir 1826 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1827 if (0 != access(buf, F_OK)) { 1828 snprintf(jrelib_p, buflen-len, "/lib"); 1829 } 1830 1831 // Add the appropriate client or server subdir 1832 len = strlen(buf); 1833 jrelib_p = buf + len; 1834 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1835 if (0 != access(buf, F_OK)) { 1836 snprintf(jrelib_p, buflen-len, "%s", ""); 1837 } 1838 1839 // If the path exists within JAVA_HOME, add the JVM library name 1840 // to complete the path to JVM being overridden. Otherwise fallback 1841 // to the path to the current library. 1842 if (0 == access(buf, F_OK)) { 1843 // Use current module name "libjvm" 1844 len = strlen(buf); 1845 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1846 } else { 1847 // Fall back to path of current library 1848 rp = realpath(dli_fname, buf); 1849 if (rp == NULL) { 1850 return; 1851 } 1852 } 1853 } 1854 } 1855 } 1856 1857 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1858 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1859 } 1860 1861 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1862 // no prefix required, not even "_" 1863 } 1864 1865 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1866 // no suffix required 1867 } 1868 1869 //////////////////////////////////////////////////////////////////////////////// 1870 // sun.misc.Signal support 1871 1872 static volatile jint sigint_count = 0; 1873 1874 static void UserHandler(int sig, void *siginfo, void *context) { 1875 // 4511530 - sem_post is serialized and handled by the manager thread. When 1876 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1877 // don't want to flood the manager thread with sem_post requests. 1878 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1879 return; 1880 } 1881 1882 // Ctrl-C is pressed during error reporting, likely because the error 1883 // handler fails to abort. Let VM die immediately. 1884 if (sig == SIGINT && is_error_reported()) { 1885 os::die(); 1886 } 1887 1888 os::signal_notify(sig); 1889 } 1890 1891 void* os::user_handler() { 1892 return CAST_FROM_FN_PTR(void*, UserHandler); 1893 } 1894 1895 extern "C" { 1896 typedef void (*sa_handler_t)(int); 1897 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1898 } 1899 1900 void* os::signal(int signal_number, void* handler) { 1901 struct sigaction sigAct, oldSigAct; 1902 1903 sigfillset(&(sigAct.sa_mask)); 1904 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1905 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1906 1907 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1908 // -1 means registration failed 1909 return (void *)-1; 1910 } 1911 1912 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1913 } 1914 1915 void os::signal_raise(int signal_number) { 1916 ::raise(signal_number); 1917 } 1918 1919 // The following code is moved from os.cpp for making this 1920 // code platform specific, which it is by its very nature. 1921 1922 // Will be modified when max signal is changed to be dynamic 1923 int os::sigexitnum_pd() { 1924 return NSIG; 1925 } 1926 1927 // a counter for each possible signal value 1928 static volatile jint pending_signals[NSIG+1] = { 0 }; 1929 1930 // Bsd(POSIX) specific hand shaking semaphore. 1931 #ifdef __APPLE__ 1932 typedef semaphore_t os_semaphore_t; 1933 1934 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1935 #define SEM_WAIT(sem) semaphore_wait(sem) 1936 #define SEM_POST(sem) semaphore_signal(sem) 1937 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1938 #else 1939 typedef sem_t os_semaphore_t; 1940 1941 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1942 #define SEM_WAIT(sem) sem_wait(&sem) 1943 #define SEM_POST(sem) sem_post(&sem) 1944 #define SEM_DESTROY(sem) sem_destroy(&sem) 1945 #endif 1946 1947 #ifdef __APPLE__ 1948 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. 1949 1950 static const char* sem_init_strerror(kern_return_t value) { 1951 switch (value) { 1952 case KERN_INVALID_ARGUMENT: return "Invalid argument"; 1953 case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; 1954 default: return "Unknown"; 1955 } 1956 } 1957 1958 OSXSemaphore::OSXSemaphore(uint value) { 1959 kern_return_t ret = SEM_INIT(_semaphore, value); 1960 1961 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); 1962 } 1963 1964 OSXSemaphore::~OSXSemaphore() { 1965 SEM_DESTROY(_semaphore); 1966 } 1967 1968 void OSXSemaphore::signal(uint count) { 1969 for (uint i = 0; i < count; i++) { 1970 kern_return_t ret = SEM_POST(_semaphore); 1971 1972 assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); 1973 } 1974 } 1975 1976 void OSXSemaphore::wait() { 1977 kern_return_t ret; 1978 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) { 1979 // Semaphore was interrupted. Retry. 1980 } 1981 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); 1982 } 1983 1984 jlong OSXSemaphore::currenttime() { 1985 struct timeval tv; 1986 gettimeofday(&tv, NULL); 1987 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1988 } 1989 1990 bool OSXSemaphore::trywait() { 1991 return timedwait(0, 0); 1992 } 1993 1994 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { 1995 kern_return_t kr = KERN_ABORTED; 1996 mach_timespec_t waitspec; 1997 waitspec.tv_sec = sec; 1998 waitspec.tv_nsec = nsec; 1999 2000 jlong starttime = currenttime(); 2001 2002 kr = semaphore_timedwait(_semaphore, waitspec); 2003 while (kr == KERN_ABORTED) { 2004 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 2005 2006 jlong current = currenttime(); 2007 jlong passedtime = current - starttime; 2008 2009 if (passedtime >= totalwait) { 2010 waitspec.tv_sec = 0; 2011 waitspec.tv_nsec = 0; 2012 } else { 2013 jlong waittime = totalwait - (current - starttime); 2014 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 2015 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 2016 } 2017 2018 kr = semaphore_timedwait(_semaphore, waitspec); 2019 } 2020 2021 return kr == KERN_SUCCESS; 2022 } 2023 2024 #else 2025 // Use POSIX implementation of semaphores. 2026 2027 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2028 struct timespec ts; 2029 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2030 2031 return ts; 2032 } 2033 2034 #endif // __APPLE__ 2035 2036 static os_semaphore_t sig_sem; 2037 2038 #ifdef __APPLE__ 2039 static OSXSemaphore sr_semaphore; 2040 #else 2041 static PosixSemaphore sr_semaphore; 2042 #endif 2043 2044 void os::signal_init_pd() { 2045 // Initialize signal structures 2046 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2047 2048 // Initialize signal semaphore 2049 ::SEM_INIT(sig_sem, 0); 2050 } 2051 2052 void os::signal_notify(int sig) { 2053 Atomic::inc(&pending_signals[sig]); 2054 ::SEM_POST(sig_sem); 2055 } 2056 2057 static int check_pending_signals(bool wait) { 2058 Atomic::store(0, &sigint_count); 2059 for (;;) { 2060 for (int i = 0; i < NSIG + 1; i++) { 2061 jint n = pending_signals[i]; 2062 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2063 return i; 2064 } 2065 } 2066 if (!wait) { 2067 return -1; 2068 } 2069 JavaThread *thread = JavaThread::current(); 2070 ThreadBlockInVM tbivm(thread); 2071 2072 bool threadIsSuspended; 2073 do { 2074 thread->set_suspend_equivalent(); 2075 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2076 ::SEM_WAIT(sig_sem); 2077 2078 // were we externally suspended while we were waiting? 2079 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2080 if (threadIsSuspended) { 2081 // The semaphore has been incremented, but while we were waiting 2082 // another thread suspended us. We don't want to continue running 2083 // while suspended because that would surprise the thread that 2084 // suspended us. 2085 ::SEM_POST(sig_sem); 2086 2087 thread->java_suspend_self(); 2088 } 2089 } while (threadIsSuspended); 2090 } 2091 } 2092 2093 int os::signal_lookup() { 2094 return check_pending_signals(false); 2095 } 2096 2097 int os::signal_wait() { 2098 return check_pending_signals(true); 2099 } 2100 2101 //////////////////////////////////////////////////////////////////////////////// 2102 // Virtual Memory 2103 2104 int os::vm_page_size() { 2105 // Seems redundant as all get out 2106 assert(os::Bsd::page_size() != -1, "must call os::init"); 2107 return os::Bsd::page_size(); 2108 } 2109 2110 // Solaris allocates memory by pages. 2111 int os::vm_allocation_granularity() { 2112 assert(os::Bsd::page_size() != -1, "must call os::init"); 2113 return os::Bsd::page_size(); 2114 } 2115 2116 // Rationale behind this function: 2117 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2118 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2119 // samples for JITted code. Here we create private executable mapping over the code cache 2120 // and then we can use standard (well, almost, as mapping can change) way to provide 2121 // info for the reporting script by storing timestamp and location of symbol 2122 void bsd_wrap_code(char* base, size_t size) { 2123 static volatile jint cnt = 0; 2124 2125 if (!UseOprofile) { 2126 return; 2127 } 2128 2129 char buf[PATH_MAX + 1]; 2130 int num = Atomic::add(1, &cnt); 2131 2132 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2133 os::get_temp_directory(), os::current_process_id(), num); 2134 unlink(buf); 2135 2136 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2137 2138 if (fd != -1) { 2139 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2140 if (rv != (off_t)-1) { 2141 if (::write(fd, "", 1) == 1) { 2142 mmap(base, size, 2143 PROT_READ|PROT_WRITE|PROT_EXEC, 2144 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2145 } 2146 } 2147 ::close(fd); 2148 unlink(buf); 2149 } 2150 } 2151 2152 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2153 int err) { 2154 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2155 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2156 os::errno_name(err), err); 2157 } 2158 2159 // NOTE: Bsd kernel does not really reserve the pages for us. 2160 // All it does is to check if there are enough free pages 2161 // left at the time of mmap(). This could be a potential 2162 // problem. 2163 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2164 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2165 #ifdef __OpenBSD__ 2166 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2167 if (::mprotect(addr, size, prot) == 0) { 2168 return true; 2169 } 2170 #else 2171 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2172 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2173 if (res != (uintptr_t) MAP_FAILED) { 2174 return true; 2175 } 2176 #endif 2177 2178 // Warn about any commit errors we see in non-product builds just 2179 // in case mmap() doesn't work as described on the man page. 2180 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2181 2182 return false; 2183 } 2184 2185 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2186 bool exec) { 2187 // alignment_hint is ignored on this OS 2188 return pd_commit_memory(addr, size, exec); 2189 } 2190 2191 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2192 const char* mesg) { 2193 assert(mesg != NULL, "mesg must be specified"); 2194 if (!pd_commit_memory(addr, size, exec)) { 2195 // add extra info in product mode for vm_exit_out_of_memory(): 2196 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2197 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2198 } 2199 } 2200 2201 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2202 size_t alignment_hint, bool exec, 2203 const char* mesg) { 2204 // alignment_hint is ignored on this OS 2205 pd_commit_memory_or_exit(addr, size, exec, mesg); 2206 } 2207 2208 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2209 } 2210 2211 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2212 ::madvise(addr, bytes, MADV_DONTNEED); 2213 } 2214 2215 void os::numa_make_global(char *addr, size_t bytes) { 2216 } 2217 2218 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2219 } 2220 2221 bool os::numa_topology_changed() { return false; } 2222 2223 size_t os::numa_get_groups_num() { 2224 return 1; 2225 } 2226 2227 int os::numa_get_group_id() { 2228 return 0; 2229 } 2230 2231 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2232 if (size > 0) { 2233 ids[0] = 0; 2234 return 1; 2235 } 2236 return 0; 2237 } 2238 2239 bool os::get_page_info(char *start, page_info* info) { 2240 return false; 2241 } 2242 2243 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2244 return end; 2245 } 2246 2247 2248 bool os::pd_uncommit_memory(char* addr, size_t size) { 2249 #ifdef __OpenBSD__ 2250 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2251 return ::mprotect(addr, size, PROT_NONE) == 0; 2252 #else 2253 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2254 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2255 return res != (uintptr_t) MAP_FAILED; 2256 #endif 2257 } 2258 2259 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2260 return os::commit_memory(addr, size, !ExecMem); 2261 } 2262 2263 // If this is a growable mapping, remove the guard pages entirely by 2264 // munmap()ping them. If not, just call uncommit_memory(). 2265 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2266 return os::uncommit_memory(addr, size); 2267 } 2268 2269 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2270 // at 'requested_addr'. If there are existing memory mappings at the same 2271 // location, however, they will be overwritten. If 'fixed' is false, 2272 // 'requested_addr' is only treated as a hint, the return value may or 2273 // may not start from the requested address. Unlike Bsd mmap(), this 2274 // function returns NULL to indicate failure. 2275 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2276 char * addr; 2277 int flags; 2278 2279 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2280 if (fixed) { 2281 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2282 flags |= MAP_FIXED; 2283 } 2284 2285 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2286 // touch an uncommitted page. Otherwise, the read/write might 2287 // succeed if we have enough swap space to back the physical page. 2288 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2289 flags, -1, 0); 2290 2291 return addr == MAP_FAILED ? NULL : addr; 2292 } 2293 2294 static int anon_munmap(char * addr, size_t size) { 2295 return ::munmap(addr, size) == 0; 2296 } 2297 2298 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2299 size_t alignment_hint) { 2300 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2301 } 2302 2303 bool os::pd_release_memory(char* addr, size_t size) { 2304 return anon_munmap(addr, size); 2305 } 2306 2307 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2308 // Bsd wants the mprotect address argument to be page aligned. 2309 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2310 2311 // According to SUSv3, mprotect() should only be used with mappings 2312 // established by mmap(), and mmap() always maps whole pages. Unaligned 2313 // 'addr' likely indicates problem in the VM (e.g. trying to change 2314 // protection of malloc'ed or statically allocated memory). Check the 2315 // caller if you hit this assert. 2316 assert(addr == bottom, "sanity check"); 2317 2318 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2319 return ::mprotect(bottom, size, prot) == 0; 2320 } 2321 2322 // Set protections specified 2323 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2324 bool is_committed) { 2325 unsigned int p = 0; 2326 switch (prot) { 2327 case MEM_PROT_NONE: p = PROT_NONE; break; 2328 case MEM_PROT_READ: p = PROT_READ; break; 2329 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2330 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2331 default: 2332 ShouldNotReachHere(); 2333 } 2334 // is_committed is unused. 2335 return bsd_mprotect(addr, bytes, p); 2336 } 2337 2338 bool os::guard_memory(char* addr, size_t size) { 2339 return bsd_mprotect(addr, size, PROT_NONE); 2340 } 2341 2342 bool os::unguard_memory(char* addr, size_t size) { 2343 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2344 } 2345 2346 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2347 return false; 2348 } 2349 2350 // Large page support 2351 2352 static size_t _large_page_size = 0; 2353 2354 void os::large_page_init() { 2355 } 2356 2357 2358 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2359 fatal("This code is not used or maintained."); 2360 2361 // "exec" is passed in but not used. Creating the shared image for 2362 // the code cache doesn't have an SHM_X executable permission to check. 2363 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2364 2365 key_t key = IPC_PRIVATE; 2366 char *addr; 2367 2368 bool warn_on_failure = UseLargePages && 2369 (!FLAG_IS_DEFAULT(UseLargePages) || 2370 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2371 2372 // Create a large shared memory region to attach to based on size. 2373 // Currently, size is the total size of the heap 2374 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2375 if (shmid == -1) { 2376 // Possible reasons for shmget failure: 2377 // 1. shmmax is too small for Java heap. 2378 // > check shmmax value: cat /proc/sys/kernel/shmmax 2379 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2380 // 2. not enough large page memory. 2381 // > check available large pages: cat /proc/meminfo 2382 // > increase amount of large pages: 2383 // echo new_value > /proc/sys/vm/nr_hugepages 2384 // Note 1: different Bsd may use different name for this property, 2385 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2386 // Note 2: it's possible there's enough physical memory available but 2387 // they are so fragmented after a long run that they can't 2388 // coalesce into large pages. Try to reserve large pages when 2389 // the system is still "fresh". 2390 if (warn_on_failure) { 2391 warning("Failed to reserve shared memory (errno = %d).", errno); 2392 } 2393 return NULL; 2394 } 2395 2396 // attach to the region 2397 addr = (char*)shmat(shmid, req_addr, 0); 2398 int err = errno; 2399 2400 // Remove shmid. If shmat() is successful, the actual shared memory segment 2401 // will be deleted when it's detached by shmdt() or when the process 2402 // terminates. If shmat() is not successful this will remove the shared 2403 // segment immediately. 2404 shmctl(shmid, IPC_RMID, NULL); 2405 2406 if ((intptr_t)addr == -1) { 2407 if (warn_on_failure) { 2408 warning("Failed to attach shared memory (errno = %d).", err); 2409 } 2410 return NULL; 2411 } 2412 2413 // The memory is committed 2414 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2415 2416 return addr; 2417 } 2418 2419 bool os::release_memory_special(char* base, size_t bytes) { 2420 if (MemTracker::tracking_level() > NMT_minimal) { 2421 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2422 // detaching the SHM segment will also delete it, see reserve_memory_special() 2423 int rslt = shmdt(base); 2424 if (rslt == 0) { 2425 tkr.record((address)base, bytes); 2426 return true; 2427 } else { 2428 return false; 2429 } 2430 } else { 2431 return shmdt(base) == 0; 2432 } 2433 } 2434 2435 size_t os::large_page_size() { 2436 return _large_page_size; 2437 } 2438 2439 // HugeTLBFS allows application to commit large page memory on demand; 2440 // with SysV SHM the entire memory region must be allocated as shared 2441 // memory. 2442 bool os::can_commit_large_page_memory() { 2443 return UseHugeTLBFS; 2444 } 2445 2446 bool os::can_execute_large_page_memory() { 2447 return UseHugeTLBFS; 2448 } 2449 2450 // Reserve memory at an arbitrary address, only if that area is 2451 // available (and not reserved for something else). 2452 2453 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2454 const int max_tries = 10; 2455 char* base[max_tries]; 2456 size_t size[max_tries]; 2457 const size_t gap = 0x000000; 2458 2459 // Assert only that the size is a multiple of the page size, since 2460 // that's all that mmap requires, and since that's all we really know 2461 // about at this low abstraction level. If we need higher alignment, 2462 // we can either pass an alignment to this method or verify alignment 2463 // in one of the methods further up the call chain. See bug 5044738. 2464 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2465 2466 // Repeatedly allocate blocks until the block is allocated at the 2467 // right spot. 2468 2469 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2470 // if kernel honors the hint then we can return immediately. 2471 char * addr = anon_mmap(requested_addr, bytes, false); 2472 if (addr == requested_addr) { 2473 return requested_addr; 2474 } 2475 2476 if (addr != NULL) { 2477 // mmap() is successful but it fails to reserve at the requested address 2478 anon_munmap(addr, bytes); 2479 } 2480 2481 int i; 2482 for (i = 0; i < max_tries; ++i) { 2483 base[i] = reserve_memory(bytes); 2484 2485 if (base[i] != NULL) { 2486 // Is this the block we wanted? 2487 if (base[i] == requested_addr) { 2488 size[i] = bytes; 2489 break; 2490 } 2491 2492 // Does this overlap the block we wanted? Give back the overlapped 2493 // parts and try again. 2494 2495 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2496 if (top_overlap >= 0 && top_overlap < bytes) { 2497 unmap_memory(base[i], top_overlap); 2498 base[i] += top_overlap; 2499 size[i] = bytes - top_overlap; 2500 } else { 2501 size_t bottom_overlap = base[i] + bytes - requested_addr; 2502 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2503 unmap_memory(requested_addr, bottom_overlap); 2504 size[i] = bytes - bottom_overlap; 2505 } else { 2506 size[i] = bytes; 2507 } 2508 } 2509 } 2510 } 2511 2512 // Give back the unused reserved pieces. 2513 2514 for (int j = 0; j < i; ++j) { 2515 if (base[j] != NULL) { 2516 unmap_memory(base[j], size[j]); 2517 } 2518 } 2519 2520 if (i < max_tries) { 2521 return requested_addr; 2522 } else { 2523 return NULL; 2524 } 2525 } 2526 2527 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2528 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2529 } 2530 2531 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2532 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2533 } 2534 2535 void os::naked_short_sleep(jlong ms) { 2536 struct timespec req; 2537 2538 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2539 req.tv_sec = 0; 2540 if (ms > 0) { 2541 req.tv_nsec = (ms % 1000) * 1000000; 2542 } else { 2543 req.tv_nsec = 1; 2544 } 2545 2546 nanosleep(&req, NULL); 2547 2548 return; 2549 } 2550 2551 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2552 void os::infinite_sleep() { 2553 while (true) { // sleep forever ... 2554 ::sleep(100); // ... 100 seconds at a time 2555 } 2556 } 2557 2558 // Used to convert frequent JVM_Yield() to nops 2559 bool os::dont_yield() { 2560 return DontYieldALot; 2561 } 2562 2563 void os::naked_yield() { 2564 sched_yield(); 2565 } 2566 2567 //////////////////////////////////////////////////////////////////////////////// 2568 // thread priority support 2569 2570 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2571 // only supports dynamic priority, static priority must be zero. For real-time 2572 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2573 // However, for large multi-threaded applications, SCHED_RR is not only slower 2574 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2575 // of 5 runs - Sep 2005). 2576 // 2577 // The following code actually changes the niceness of kernel-thread/LWP. It 2578 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2579 // not the entire user process, and user level threads are 1:1 mapped to kernel 2580 // threads. It has always been the case, but could change in the future. For 2581 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2582 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2583 2584 #if !defined(__APPLE__) 2585 int os::java_to_os_priority[CriticalPriority + 1] = { 2586 19, // 0 Entry should never be used 2587 2588 0, // 1 MinPriority 2589 3, // 2 2590 6, // 3 2591 2592 10, // 4 2593 15, // 5 NormPriority 2594 18, // 6 2595 2596 21, // 7 2597 25, // 8 2598 28, // 9 NearMaxPriority 2599 2600 31, // 10 MaxPriority 2601 2602 31 // 11 CriticalPriority 2603 }; 2604 #else 2605 // Using Mach high-level priority assignments 2606 int os::java_to_os_priority[CriticalPriority + 1] = { 2607 0, // 0 Entry should never be used (MINPRI_USER) 2608 2609 27, // 1 MinPriority 2610 28, // 2 2611 29, // 3 2612 2613 30, // 4 2614 31, // 5 NormPriority (BASEPRI_DEFAULT) 2615 32, // 6 2616 2617 33, // 7 2618 34, // 8 2619 35, // 9 NearMaxPriority 2620 2621 36, // 10 MaxPriority 2622 2623 36 // 11 CriticalPriority 2624 }; 2625 #endif 2626 2627 static int prio_init() { 2628 if (ThreadPriorityPolicy == 1) { 2629 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2630 // if effective uid is not root. Perhaps, a more elegant way of doing 2631 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2632 if (geteuid() != 0) { 2633 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2634 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2635 } 2636 ThreadPriorityPolicy = 0; 2637 } 2638 } 2639 if (UseCriticalJavaThreadPriority) { 2640 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2641 } 2642 return 0; 2643 } 2644 2645 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2646 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2647 2648 #ifdef __OpenBSD__ 2649 // OpenBSD pthread_setprio starves low priority threads 2650 return OS_OK; 2651 #elif defined(__FreeBSD__) 2652 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2653 #elif defined(__APPLE__) || defined(__NetBSD__) 2654 struct sched_param sp; 2655 int policy; 2656 pthread_t self = pthread_self(); 2657 2658 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2659 return OS_ERR; 2660 } 2661 2662 sp.sched_priority = newpri; 2663 if (pthread_setschedparam(self, policy, &sp) != 0) { 2664 return OS_ERR; 2665 } 2666 2667 return OS_OK; 2668 #else 2669 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2670 return (ret == 0) ? OS_OK : OS_ERR; 2671 #endif 2672 } 2673 2674 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2675 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2676 *priority_ptr = java_to_os_priority[NormPriority]; 2677 return OS_OK; 2678 } 2679 2680 errno = 0; 2681 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2682 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2683 #elif defined(__APPLE__) || defined(__NetBSD__) 2684 int policy; 2685 struct sched_param sp; 2686 2687 pthread_getschedparam(pthread_self(), &policy, &sp); 2688 *priority_ptr = sp.sched_priority; 2689 #else 2690 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2691 #endif 2692 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2693 } 2694 2695 // Hint to the underlying OS that a task switch would not be good. 2696 // Void return because it's a hint and can fail. 2697 void os::hint_no_preempt() {} 2698 2699 //////////////////////////////////////////////////////////////////////////////// 2700 // suspend/resume support 2701 2702 // the low-level signal-based suspend/resume support is a remnant from the 2703 // old VM-suspension that used to be for java-suspension, safepoints etc, 2704 // within hotspot. Now there is a single use-case for this: 2705 // - calling get_thread_pc() on the VMThread by the flat-profiler task 2706 // that runs in the watcher thread. 2707 // The remaining code is greatly simplified from the more general suspension 2708 // code that used to be used. 2709 // 2710 // The protocol is quite simple: 2711 // - suspend: 2712 // - sends a signal to the target thread 2713 // - polls the suspend state of the osthread using a yield loop 2714 // - target thread signal handler (SR_handler) sets suspend state 2715 // and blocks in sigsuspend until continued 2716 // - resume: 2717 // - sets target osthread state to continue 2718 // - sends signal to end the sigsuspend loop in the SR_handler 2719 // 2720 // Note that the SR_lock plays no role in this suspend/resume protocol. 2721 2722 static void resume_clear_context(OSThread *osthread) { 2723 osthread->set_ucontext(NULL); 2724 osthread->set_siginfo(NULL); 2725 } 2726 2727 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2728 osthread->set_ucontext(context); 2729 osthread->set_siginfo(siginfo); 2730 } 2731 2732 // Handler function invoked when a thread's execution is suspended or 2733 // resumed. We have to be careful that only async-safe functions are 2734 // called here (Note: most pthread functions are not async safe and 2735 // should be avoided.) 2736 // 2737 // Note: sigwait() is a more natural fit than sigsuspend() from an 2738 // interface point of view, but sigwait() prevents the signal hander 2739 // from being run. libpthread would get very confused by not having 2740 // its signal handlers run and prevents sigwait()'s use with the 2741 // mutex granting granting signal. 2742 // 2743 // Currently only ever called on the VMThread or JavaThread 2744 // 2745 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2746 // Save and restore errno to avoid confusing native code with EINTR 2747 // after sigsuspend. 2748 int old_errno = errno; 2749 2750 Thread* thread = Thread::current(); 2751 OSThread* osthread = thread->osthread(); 2752 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2753 2754 os::SuspendResume::State current = osthread->sr.state(); 2755 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2756 suspend_save_context(osthread, siginfo, context); 2757 2758 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2759 os::SuspendResume::State state = osthread->sr.suspended(); 2760 if (state == os::SuspendResume::SR_SUSPENDED) { 2761 sigset_t suspend_set; // signals for sigsuspend() 2762 2763 // get current set of blocked signals and unblock resume signal 2764 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2765 sigdelset(&suspend_set, SR_signum); 2766 2767 sr_semaphore.signal(); 2768 // wait here until we are resumed 2769 while (1) { 2770 sigsuspend(&suspend_set); 2771 2772 os::SuspendResume::State result = osthread->sr.running(); 2773 if (result == os::SuspendResume::SR_RUNNING) { 2774 sr_semaphore.signal(); 2775 break; 2776 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2777 ShouldNotReachHere(); 2778 } 2779 } 2780 2781 } else if (state == os::SuspendResume::SR_RUNNING) { 2782 // request was cancelled, continue 2783 } else { 2784 ShouldNotReachHere(); 2785 } 2786 2787 resume_clear_context(osthread); 2788 } else if (current == os::SuspendResume::SR_RUNNING) { 2789 // request was cancelled, continue 2790 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2791 // ignore 2792 } else { 2793 // ignore 2794 } 2795 2796 errno = old_errno; 2797 } 2798 2799 2800 static int SR_initialize() { 2801 struct sigaction act; 2802 char *s; 2803 // Get signal number to use for suspend/resume 2804 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2805 int sig = ::strtol(s, 0, 10); 2806 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2807 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2808 SR_signum = sig; 2809 } else { 2810 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2811 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2812 } 2813 } 2814 2815 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2816 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2817 2818 sigemptyset(&SR_sigset); 2819 sigaddset(&SR_sigset, SR_signum); 2820 2821 // Set up signal handler for suspend/resume 2822 act.sa_flags = SA_RESTART|SA_SIGINFO; 2823 act.sa_handler = (void (*)(int)) SR_handler; 2824 2825 // SR_signum is blocked by default. 2826 // 4528190 - We also need to block pthread restart signal (32 on all 2827 // supported Bsd platforms). Note that BsdThreads need to block 2828 // this signal for all threads to work properly. So we don't have 2829 // to use hard-coded signal number when setting up the mask. 2830 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2831 2832 if (sigaction(SR_signum, &act, 0) == -1) { 2833 return -1; 2834 } 2835 2836 // Save signal flag 2837 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2838 return 0; 2839 } 2840 2841 static int sr_notify(OSThread* osthread) { 2842 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2843 assert_status(status == 0, status, "pthread_kill"); 2844 return status; 2845 } 2846 2847 // "Randomly" selected value for how long we want to spin 2848 // before bailing out on suspending a thread, also how often 2849 // we send a signal to a thread we want to resume 2850 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2851 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2852 2853 // returns true on success and false on error - really an error is fatal 2854 // but this seems the normal response to library errors 2855 static bool do_suspend(OSThread* osthread) { 2856 assert(osthread->sr.is_running(), "thread should be running"); 2857 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2858 2859 // mark as suspended and send signal 2860 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2861 // failed to switch, state wasn't running? 2862 ShouldNotReachHere(); 2863 return false; 2864 } 2865 2866 if (sr_notify(osthread) != 0) { 2867 ShouldNotReachHere(); 2868 } 2869 2870 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2871 while (true) { 2872 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2873 break; 2874 } else { 2875 // timeout 2876 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2877 if (cancelled == os::SuspendResume::SR_RUNNING) { 2878 return false; 2879 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2880 // make sure that we consume the signal on the semaphore as well 2881 sr_semaphore.wait(); 2882 break; 2883 } else { 2884 ShouldNotReachHere(); 2885 return false; 2886 } 2887 } 2888 } 2889 2890 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2891 return true; 2892 } 2893 2894 static void do_resume(OSThread* osthread) { 2895 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2896 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2897 2898 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2899 // failed to switch to WAKEUP_REQUEST 2900 ShouldNotReachHere(); 2901 return; 2902 } 2903 2904 while (true) { 2905 if (sr_notify(osthread) == 0) { 2906 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2907 if (osthread->sr.is_running()) { 2908 return; 2909 } 2910 } 2911 } else { 2912 ShouldNotReachHere(); 2913 } 2914 } 2915 2916 guarantee(osthread->sr.is_running(), "Must be running!"); 2917 } 2918 2919 /////////////////////////////////////////////////////////////////////////////////// 2920 // signal handling (except suspend/resume) 2921 2922 // This routine may be used by user applications as a "hook" to catch signals. 2923 // The user-defined signal handler must pass unrecognized signals to this 2924 // routine, and if it returns true (non-zero), then the signal handler must 2925 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2926 // routine will never retun false (zero), but instead will execute a VM panic 2927 // routine kill the process. 2928 // 2929 // If this routine returns false, it is OK to call it again. This allows 2930 // the user-defined signal handler to perform checks either before or after 2931 // the VM performs its own checks. Naturally, the user code would be making 2932 // a serious error if it tried to handle an exception (such as a null check 2933 // or breakpoint) that the VM was generating for its own correct operation. 2934 // 2935 // This routine may recognize any of the following kinds of signals: 2936 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2937 // It should be consulted by handlers for any of those signals. 2938 // 2939 // The caller of this routine must pass in the three arguments supplied 2940 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2941 // field of the structure passed to sigaction(). This routine assumes that 2942 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2943 // 2944 // Note that the VM will print warnings if it detects conflicting signal 2945 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2946 // 2947 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2948 void* ucontext, 2949 int abort_if_unrecognized); 2950 2951 void signalHandler(int sig, siginfo_t* info, void* uc) { 2952 assert(info != NULL && uc != NULL, "it must be old kernel"); 2953 int orig_errno = errno; // Preserve errno value over signal handler. 2954 JVM_handle_bsd_signal(sig, info, uc, true); 2955 errno = orig_errno; 2956 } 2957 2958 2959 // This boolean allows users to forward their own non-matching signals 2960 // to JVM_handle_bsd_signal, harmlessly. 2961 bool os::Bsd::signal_handlers_are_installed = false; 2962 2963 // For signal-chaining 2964 struct sigaction sigact[NSIG]; 2965 uint32_t sigs = 0; 2966 #if (32 < NSIG-1) 2967 #error "Not all signals can be encoded in sigs. Adapt its type!" 2968 #endif 2969 bool os::Bsd::libjsig_is_loaded = false; 2970 typedef struct sigaction *(*get_signal_t)(int); 2971 get_signal_t os::Bsd::get_signal_action = NULL; 2972 2973 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2974 struct sigaction *actp = NULL; 2975 2976 if (libjsig_is_loaded) { 2977 // Retrieve the old signal handler from libjsig 2978 actp = (*get_signal_action)(sig); 2979 } 2980 if (actp == NULL) { 2981 // Retrieve the preinstalled signal handler from jvm 2982 actp = get_preinstalled_handler(sig); 2983 } 2984 2985 return actp; 2986 } 2987 2988 static bool call_chained_handler(struct sigaction *actp, int sig, 2989 siginfo_t *siginfo, void *context) { 2990 // Call the old signal handler 2991 if (actp->sa_handler == SIG_DFL) { 2992 // It's more reasonable to let jvm treat it as an unexpected exception 2993 // instead of taking the default action. 2994 return false; 2995 } else if (actp->sa_handler != SIG_IGN) { 2996 if ((actp->sa_flags & SA_NODEFER) == 0) { 2997 // automaticlly block the signal 2998 sigaddset(&(actp->sa_mask), sig); 2999 } 3000 3001 sa_handler_t hand; 3002 sa_sigaction_t sa; 3003 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3004 // retrieve the chained handler 3005 if (siginfo_flag_set) { 3006 sa = actp->sa_sigaction; 3007 } else { 3008 hand = actp->sa_handler; 3009 } 3010 3011 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3012 actp->sa_handler = SIG_DFL; 3013 } 3014 3015 // try to honor the signal mask 3016 sigset_t oset; 3017 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3018 3019 // call into the chained handler 3020 if (siginfo_flag_set) { 3021 (*sa)(sig, siginfo, context); 3022 } else { 3023 (*hand)(sig); 3024 } 3025 3026 // restore the signal mask 3027 pthread_sigmask(SIG_SETMASK, &oset, 0); 3028 } 3029 // Tell jvm's signal handler the signal is taken care of. 3030 return true; 3031 } 3032 3033 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3034 bool chained = false; 3035 // signal-chaining 3036 if (UseSignalChaining) { 3037 struct sigaction *actp = get_chained_signal_action(sig); 3038 if (actp != NULL) { 3039 chained = call_chained_handler(actp, sig, siginfo, context); 3040 } 3041 } 3042 return chained; 3043 } 3044 3045 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3046 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 3047 return &sigact[sig]; 3048 } 3049 return NULL; 3050 } 3051 3052 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3053 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3054 sigact[sig] = oldAct; 3055 sigs |= (uint32_t)1 << (sig-1); 3056 } 3057 3058 // for diagnostic 3059 int sigflags[NSIG]; 3060 3061 int os::Bsd::get_our_sigflags(int sig) { 3062 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3063 return sigflags[sig]; 3064 } 3065 3066 void os::Bsd::set_our_sigflags(int sig, int flags) { 3067 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3068 if (sig > 0 && sig < NSIG) { 3069 sigflags[sig] = flags; 3070 } 3071 } 3072 3073 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3074 // Check for overwrite. 3075 struct sigaction oldAct; 3076 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3077 3078 void* oldhand = oldAct.sa_sigaction 3079 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3080 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3081 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3082 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3083 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3084 if (AllowUserSignalHandlers || !set_installed) { 3085 // Do not overwrite; user takes responsibility to forward to us. 3086 return; 3087 } else if (UseSignalChaining) { 3088 // save the old handler in jvm 3089 save_preinstalled_handler(sig, oldAct); 3090 // libjsig also interposes the sigaction() call below and saves the 3091 // old sigaction on it own. 3092 } else { 3093 fatal("Encountered unexpected pre-existing sigaction handler " 3094 "%#lx for signal %d.", (long)oldhand, sig); 3095 } 3096 } 3097 3098 struct sigaction sigAct; 3099 sigfillset(&(sigAct.sa_mask)); 3100 sigAct.sa_handler = SIG_DFL; 3101 if (!set_installed) { 3102 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3103 } else { 3104 sigAct.sa_sigaction = signalHandler; 3105 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3106 } 3107 #ifdef __APPLE__ 3108 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3109 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3110 // if the signal handler declares it will handle it on alternate stack. 3111 // Notice we only declare we will handle it on alt stack, but we are not 3112 // actually going to use real alt stack - this is just a workaround. 3113 // Please see ux_exception.c, method catch_mach_exception_raise for details 3114 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3115 if (sig == SIGSEGV) { 3116 sigAct.sa_flags |= SA_ONSTACK; 3117 } 3118 #endif 3119 3120 // Save flags, which are set by ours 3121 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3122 sigflags[sig] = sigAct.sa_flags; 3123 3124 int ret = sigaction(sig, &sigAct, &oldAct); 3125 assert(ret == 0, "check"); 3126 3127 void* oldhand2 = oldAct.sa_sigaction 3128 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3129 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3130 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3131 } 3132 3133 // install signal handlers for signals that HotSpot needs to 3134 // handle in order to support Java-level exception handling. 3135 3136 void os::Bsd::install_signal_handlers() { 3137 if (!signal_handlers_are_installed) { 3138 signal_handlers_are_installed = true; 3139 3140 // signal-chaining 3141 typedef void (*signal_setting_t)(); 3142 signal_setting_t begin_signal_setting = NULL; 3143 signal_setting_t end_signal_setting = NULL; 3144 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3145 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3146 if (begin_signal_setting != NULL) { 3147 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3148 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3149 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3150 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3151 libjsig_is_loaded = true; 3152 assert(UseSignalChaining, "should enable signal-chaining"); 3153 } 3154 if (libjsig_is_loaded) { 3155 // Tell libjsig jvm is setting signal handlers 3156 (*begin_signal_setting)(); 3157 } 3158 3159 set_signal_handler(SIGSEGV, true); 3160 set_signal_handler(SIGPIPE, true); 3161 set_signal_handler(SIGBUS, true); 3162 set_signal_handler(SIGILL, true); 3163 set_signal_handler(SIGFPE, true); 3164 set_signal_handler(SIGXFSZ, true); 3165 3166 #if defined(__APPLE__) 3167 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3168 // signals caught and handled by the JVM. To work around this, we reset the mach task 3169 // signal handler that's placed on our process by CrashReporter. This disables 3170 // CrashReporter-based reporting. 3171 // 3172 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3173 // on caught fatal signals. 3174 // 3175 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3176 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3177 // exception handling, while leaving the standard BSD signal handlers functional. 3178 kern_return_t kr; 3179 kr = task_set_exception_ports(mach_task_self(), 3180 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3181 MACH_PORT_NULL, 3182 EXCEPTION_STATE_IDENTITY, 3183 MACHINE_THREAD_STATE); 3184 3185 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3186 #endif 3187 3188 if (libjsig_is_loaded) { 3189 // Tell libjsig jvm finishes setting signal handlers 3190 (*end_signal_setting)(); 3191 } 3192 3193 // We don't activate signal checker if libjsig is in place, we trust ourselves 3194 // and if UserSignalHandler is installed all bets are off 3195 if (CheckJNICalls) { 3196 if (libjsig_is_loaded) { 3197 if (PrintJNIResolving) { 3198 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3199 } 3200 check_signals = false; 3201 } 3202 if (AllowUserSignalHandlers) { 3203 if (PrintJNIResolving) { 3204 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3205 } 3206 check_signals = false; 3207 } 3208 } 3209 } 3210 } 3211 3212 3213 ///// 3214 // glibc on Bsd platform uses non-documented flag 3215 // to indicate, that some special sort of signal 3216 // trampoline is used. 3217 // We will never set this flag, and we should 3218 // ignore this flag in our diagnostic 3219 #ifdef SIGNIFICANT_SIGNAL_MASK 3220 #undef SIGNIFICANT_SIGNAL_MASK 3221 #endif 3222 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3223 3224 static const char* get_signal_handler_name(address handler, 3225 char* buf, int buflen) { 3226 int offset; 3227 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3228 if (found) { 3229 // skip directory names 3230 const char *p1, *p2; 3231 p1 = buf; 3232 size_t len = strlen(os::file_separator()); 3233 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3234 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3235 } else { 3236 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3237 } 3238 return buf; 3239 } 3240 3241 static void print_signal_handler(outputStream* st, int sig, 3242 char* buf, size_t buflen) { 3243 struct sigaction sa; 3244 3245 sigaction(sig, NULL, &sa); 3246 3247 // See comment for SIGNIFICANT_SIGNAL_MASK define 3248 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3249 3250 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3251 3252 address handler = (sa.sa_flags & SA_SIGINFO) 3253 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3254 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3255 3256 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3257 st->print("SIG_DFL"); 3258 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3259 st->print("SIG_IGN"); 3260 } else { 3261 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3262 } 3263 3264 st->print(", sa_mask[0]="); 3265 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3266 3267 address rh = VMError::get_resetted_sighandler(sig); 3268 // May be, handler was resetted by VMError? 3269 if (rh != NULL) { 3270 handler = rh; 3271 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3272 } 3273 3274 st->print(", sa_flags="); 3275 os::Posix::print_sa_flags(st, sa.sa_flags); 3276 3277 // Check: is it our handler? 3278 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3279 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3280 // It is our signal handler 3281 // check for flags, reset system-used one! 3282 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3283 st->print( 3284 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3285 os::Bsd::get_our_sigflags(sig)); 3286 } 3287 } 3288 st->cr(); 3289 } 3290 3291 3292 #define DO_SIGNAL_CHECK(sig) \ 3293 do { \ 3294 if (!sigismember(&check_signal_done, sig)) { \ 3295 os::Bsd::check_signal_handler(sig); \ 3296 } \ 3297 } while (0) 3298 3299 // This method is a periodic task to check for misbehaving JNI applications 3300 // under CheckJNI, we can add any periodic checks here 3301 3302 void os::run_periodic_checks() { 3303 3304 if (check_signals == false) return; 3305 3306 // SEGV and BUS if overridden could potentially prevent 3307 // generation of hs*.log in the event of a crash, debugging 3308 // such a case can be very challenging, so we absolutely 3309 // check the following for a good measure: 3310 DO_SIGNAL_CHECK(SIGSEGV); 3311 DO_SIGNAL_CHECK(SIGILL); 3312 DO_SIGNAL_CHECK(SIGFPE); 3313 DO_SIGNAL_CHECK(SIGBUS); 3314 DO_SIGNAL_CHECK(SIGPIPE); 3315 DO_SIGNAL_CHECK(SIGXFSZ); 3316 3317 3318 // ReduceSignalUsage allows the user to override these handlers 3319 // see comments at the very top and jvm_solaris.h 3320 if (!ReduceSignalUsage) { 3321 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3322 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3323 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3324 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3325 } 3326 3327 DO_SIGNAL_CHECK(SR_signum); 3328 } 3329 3330 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3331 3332 static os_sigaction_t os_sigaction = NULL; 3333 3334 void os::Bsd::check_signal_handler(int sig) { 3335 char buf[O_BUFLEN]; 3336 address jvmHandler = NULL; 3337 3338 3339 struct sigaction act; 3340 if (os_sigaction == NULL) { 3341 // only trust the default sigaction, in case it has been interposed 3342 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3343 if (os_sigaction == NULL) return; 3344 } 3345 3346 os_sigaction(sig, (struct sigaction*)NULL, &act); 3347 3348 3349 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3350 3351 address thisHandler = (act.sa_flags & SA_SIGINFO) 3352 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3353 : CAST_FROM_FN_PTR(address, act.sa_handler); 3354 3355 3356 switch (sig) { 3357 case SIGSEGV: 3358 case SIGBUS: 3359 case SIGFPE: 3360 case SIGPIPE: 3361 case SIGILL: 3362 case SIGXFSZ: 3363 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3364 break; 3365 3366 case SHUTDOWN1_SIGNAL: 3367 case SHUTDOWN2_SIGNAL: 3368 case SHUTDOWN3_SIGNAL: 3369 case BREAK_SIGNAL: 3370 jvmHandler = (address)user_handler(); 3371 break; 3372 3373 default: 3374 if (sig == SR_signum) { 3375 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3376 } else { 3377 return; 3378 } 3379 break; 3380 } 3381 3382 if (thisHandler != jvmHandler) { 3383 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3384 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3385 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3386 // No need to check this sig any longer 3387 sigaddset(&check_signal_done, sig); 3388 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3389 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3390 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3391 exception_name(sig, buf, O_BUFLEN)); 3392 } 3393 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3394 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3395 tty->print("expected:"); 3396 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3397 tty->cr(); 3398 tty->print(" found:"); 3399 os::Posix::print_sa_flags(tty, act.sa_flags); 3400 tty->cr(); 3401 // No need to check this sig any longer 3402 sigaddset(&check_signal_done, sig); 3403 } 3404 3405 // Dump all the signal 3406 if (sigismember(&check_signal_done, sig)) { 3407 print_signal_handlers(tty, buf, O_BUFLEN); 3408 } 3409 } 3410 3411 extern void report_error(char* file_name, int line_no, char* title, 3412 char* format, ...); 3413 3414 // this is called _before_ the most of global arguments have been parsed 3415 void os::init(void) { 3416 char dummy; // used to get a guess on initial stack address 3417 // first_hrtime = gethrtime(); 3418 3419 // With BsdThreads the JavaMain thread pid (primordial thread) 3420 // is different than the pid of the java launcher thread. 3421 // So, on Bsd, the launcher thread pid is passed to the VM 3422 // via the sun.java.launcher.pid property. 3423 // Use this property instead of getpid() if it was correctly passed. 3424 // See bug 6351349. 3425 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3426 3427 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3428 3429 clock_tics_per_sec = CLK_TCK; 3430 3431 init_random(1234567); 3432 3433 ThreadCritical::initialize(); 3434 3435 Bsd::set_page_size(getpagesize()); 3436 if (Bsd::page_size() == -1) { 3437 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3438 } 3439 init_page_sizes((size_t) Bsd::page_size()); 3440 3441 Bsd::initialize_system_info(); 3442 3443 // main_thread points to the aboriginal thread 3444 Bsd::_main_thread = pthread_self(); 3445 3446 Bsd::clock_init(); 3447 initial_time_count = javaTimeNanos(); 3448 3449 #ifdef __APPLE__ 3450 // XXXDARWIN 3451 // Work around the unaligned VM callbacks in hotspot's 3452 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3453 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3454 // alignment when doing symbol lookup. To work around this, we force early 3455 // binding of all symbols now, thus binding when alignment is known-good. 3456 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3457 #endif 3458 } 3459 3460 // To install functions for atexit system call 3461 extern "C" { 3462 static void perfMemory_exit_helper() { 3463 perfMemory_exit(); 3464 } 3465 } 3466 3467 // this is called _after_ the global arguments have been parsed 3468 jint os::init_2(void) { 3469 // Allocate a single page and mark it as readable for safepoint polling 3470 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3471 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page"); 3472 3473 os::set_polling_page(polling_page); 3474 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 3475 3476 if (!UseMembar) { 3477 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3478 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3479 os::set_memory_serialize_page(mem_serialize_page); 3480 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 3481 } 3482 3483 // initialize suspend/resume support - must do this before signal_sets_init() 3484 if (SR_initialize() != 0) { 3485 perror("SR_initialize failed"); 3486 return JNI_ERR; 3487 } 3488 3489 Bsd::signal_sets_init(); 3490 Bsd::install_signal_handlers(); 3491 3492 // Check minimum allowable stack size for thread creation and to initialize 3493 // the java system classes, including StackOverflowError - depends on page 3494 // size. Add two 4K pages for compiler2 recursion in main thread. 3495 // Add in 4*BytesPerWord 4K pages to account for VM stack during 3496 // class initialization depending on 32 or 64 bit VM. 3497 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3498 JavaThread::stack_guard_zone_size() + 3499 JavaThread::stack_shadow_zone_size() + 3500 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 3501 3502 os::Bsd::min_stack_allowed = align_size_up(os::Bsd::min_stack_allowed, os::vm_page_size()); 3503 3504 size_t threadStackSizeInBytes = ThreadStackSize * K; 3505 if (threadStackSizeInBytes != 0 && 3506 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3507 tty->print_cr("\nThe stack size specified is too small, " 3508 "Specify at least %dk", 3509 os::Bsd::min_stack_allowed/ K); 3510 return JNI_ERR; 3511 } 3512 3513 // Make the stack size a multiple of the page size so that 3514 // the yellow/red zones can be guarded. 3515 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3516 vm_page_size())); 3517 3518 if (MaxFDLimit) { 3519 // set the number of file descriptors to max. print out error 3520 // if getrlimit/setrlimit fails but continue regardless. 3521 struct rlimit nbr_files; 3522 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3523 if (status != 0) { 3524 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3525 } else { 3526 nbr_files.rlim_cur = nbr_files.rlim_max; 3527 3528 #ifdef __APPLE__ 3529 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3530 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3531 // be used instead 3532 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3533 #endif 3534 3535 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3536 if (status != 0) { 3537 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3538 } 3539 } 3540 } 3541 3542 // at-exit methods are called in the reverse order of their registration. 3543 // atexit functions are called on return from main or as a result of a 3544 // call to exit(3C). There can be only 32 of these functions registered 3545 // and atexit() does not set errno. 3546 3547 if (PerfAllowAtExitRegistration) { 3548 // only register atexit functions if PerfAllowAtExitRegistration is set. 3549 // atexit functions can be delayed until process exit time, which 3550 // can be problematic for embedded VM situations. Embedded VMs should 3551 // call DestroyJavaVM() to assure that VM resources are released. 3552 3553 // note: perfMemory_exit_helper atexit function may be removed in 3554 // the future if the appropriate cleanup code can be added to the 3555 // VM_Exit VMOperation's doit method. 3556 if (atexit(perfMemory_exit_helper) != 0) { 3557 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3558 } 3559 } 3560 3561 // initialize thread priority policy 3562 prio_init(); 3563 3564 #ifdef __APPLE__ 3565 // dynamically link to objective c gc registration 3566 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3567 if (handleLibObjc != NULL) { 3568 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3569 } 3570 #endif 3571 3572 return JNI_OK; 3573 } 3574 3575 // Mark the polling page as unreadable 3576 void os::make_polling_page_unreadable(void) { 3577 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3578 fatal("Could not disable polling page"); 3579 } 3580 } 3581 3582 // Mark the polling page as readable 3583 void os::make_polling_page_readable(void) { 3584 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3585 fatal("Could not enable polling page"); 3586 } 3587 } 3588 3589 int os::active_processor_count() { 3590 return _processor_count; 3591 } 3592 3593 void os::set_native_thread_name(const char *name) { 3594 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3595 // This is only supported in Snow Leopard and beyond 3596 if (name != NULL) { 3597 // Add a "Java: " prefix to the name 3598 char buf[MAXTHREADNAMESIZE]; 3599 snprintf(buf, sizeof(buf), "Java: %s", name); 3600 pthread_setname_np(buf); 3601 } 3602 #endif 3603 } 3604 3605 bool os::distribute_processes(uint length, uint* distribution) { 3606 // Not yet implemented. 3607 return false; 3608 } 3609 3610 bool os::bind_to_processor(uint processor_id) { 3611 // Not yet implemented. 3612 return false; 3613 } 3614 3615 void os::SuspendedThreadTask::internal_do_task() { 3616 if (do_suspend(_thread->osthread())) { 3617 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3618 do_task(context); 3619 do_resume(_thread->osthread()); 3620 } 3621 } 3622 3623 /// 3624 class PcFetcher : public os::SuspendedThreadTask { 3625 public: 3626 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3627 ExtendedPC result(); 3628 protected: 3629 void do_task(const os::SuspendedThreadTaskContext& context); 3630 private: 3631 ExtendedPC _epc; 3632 }; 3633 3634 ExtendedPC PcFetcher::result() { 3635 guarantee(is_done(), "task is not done yet."); 3636 return _epc; 3637 } 3638 3639 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3640 Thread* thread = context.thread(); 3641 OSThread* osthread = thread->osthread(); 3642 if (osthread->ucontext() != NULL) { 3643 _epc = os::Bsd::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3644 } else { 3645 // NULL context is unexpected, double-check this is the VMThread 3646 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3647 } 3648 } 3649 3650 // Suspends the target using the signal mechanism and then grabs the PC before 3651 // resuming the target. Used by the flat-profiler only 3652 ExtendedPC os::get_thread_pc(Thread* thread) { 3653 // Make sure that it is called by the watcher for the VMThread 3654 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3655 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3656 3657 PcFetcher fetcher(thread); 3658 fetcher.run(); 3659 return fetcher.result(); 3660 } 3661 3662 //////////////////////////////////////////////////////////////////////////////// 3663 // debug support 3664 3665 bool os::find(address addr, outputStream* st) { 3666 Dl_info dlinfo; 3667 memset(&dlinfo, 0, sizeof(dlinfo)); 3668 if (dladdr(addr, &dlinfo) != 0) { 3669 st->print(PTR_FORMAT ": ", addr); 3670 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3671 st->print("%s+%#x", dlinfo.dli_sname, 3672 addr - (intptr_t)dlinfo.dli_saddr); 3673 } else if (dlinfo.dli_fbase != NULL) { 3674 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3675 } else { 3676 st->print("<absolute address>"); 3677 } 3678 if (dlinfo.dli_fname != NULL) { 3679 st->print(" in %s", dlinfo.dli_fname); 3680 } 3681 if (dlinfo.dli_fbase != NULL) { 3682 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3683 } 3684 st->cr(); 3685 3686 if (Verbose) { 3687 // decode some bytes around the PC 3688 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3689 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3690 address lowest = (address) dlinfo.dli_sname; 3691 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3692 if (begin < lowest) begin = lowest; 3693 Dl_info dlinfo2; 3694 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3695 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3696 end = (address) dlinfo2.dli_saddr; 3697 } 3698 Disassembler::decode(begin, end, st); 3699 } 3700 return true; 3701 } 3702 return false; 3703 } 3704 3705 //////////////////////////////////////////////////////////////////////////////// 3706 // misc 3707 3708 // This does not do anything on Bsd. This is basically a hook for being 3709 // able to use structured exception handling (thread-local exception filters) 3710 // on, e.g., Win32. 3711 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3712 const methodHandle& method, JavaCallArguments* args, 3713 Thread* thread) { 3714 f(value, method, args, thread); 3715 } 3716 3717 void os::print_statistics() { 3718 } 3719 3720 bool os::message_box(const char* title, const char* message) { 3721 int i; 3722 fdStream err(defaultStream::error_fd()); 3723 for (i = 0; i < 78; i++) err.print_raw("="); 3724 err.cr(); 3725 err.print_raw_cr(title); 3726 for (i = 0; i < 78; i++) err.print_raw("-"); 3727 err.cr(); 3728 err.print_raw_cr(message); 3729 for (i = 0; i < 78; i++) err.print_raw("="); 3730 err.cr(); 3731 3732 char buf[16]; 3733 // Prevent process from exiting upon "read error" without consuming all CPU 3734 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3735 3736 return buf[0] == 'y' || buf[0] == 'Y'; 3737 } 3738 3739 int os::stat(const char *path, struct stat *sbuf) { 3740 char pathbuf[MAX_PATH]; 3741 if (strlen(path) > MAX_PATH - 1) { 3742 errno = ENAMETOOLONG; 3743 return -1; 3744 } 3745 os::native_path(strcpy(pathbuf, path)); 3746 return ::stat(pathbuf, sbuf); 3747 } 3748 3749 static inline struct timespec get_mtime(const char* filename) { 3750 struct stat st; 3751 int ret = os::stat(filename, &st); 3752 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3753 #ifdef __APPLE__ 3754 return st.st_mtimespec; 3755 #else 3756 return st.st_mtim; 3757 #endif 3758 } 3759 3760 int os::compare_file_modified_times(const char* file1, const char* file2) { 3761 struct timespec filetime1 = get_mtime(file1); 3762 struct timespec filetime2 = get_mtime(file2); 3763 int diff = filetime1.tv_sec - filetime2.tv_sec; 3764 if (diff == 0) { 3765 return filetime1.tv_nsec - filetime2.tv_nsec; 3766 } 3767 return diff; 3768 } 3769 3770 3771 bool os::check_heap(bool force) { 3772 return true; 3773 } 3774 3775 // Is a (classpath) directory empty? 3776 bool os::dir_is_empty(const char* path) { 3777 DIR *dir = NULL; 3778 struct dirent *ptr; 3779 3780 dir = opendir(path); 3781 if (dir == NULL) return true; 3782 3783 // Scan the directory 3784 bool result = true; 3785 char buf[sizeof(struct dirent) + MAX_PATH]; 3786 while (result && (ptr = ::readdir(dir)) != NULL) { 3787 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3788 result = false; 3789 } 3790 } 3791 closedir(dir); 3792 return result; 3793 } 3794 3795 // This code originates from JDK's sysOpen and open64_w 3796 // from src/solaris/hpi/src/system_md.c 3797 3798 int os::open(const char *path, int oflag, int mode) { 3799 if (strlen(path) > MAX_PATH - 1) { 3800 errno = ENAMETOOLONG; 3801 return -1; 3802 } 3803 int fd; 3804 3805 fd = ::open(path, oflag, mode); 3806 if (fd == -1) return -1; 3807 3808 // If the open succeeded, the file might still be a directory 3809 { 3810 struct stat buf; 3811 int ret = ::fstat(fd, &buf); 3812 int st_mode = buf.st_mode; 3813 3814 if (ret != -1) { 3815 if ((st_mode & S_IFMT) == S_IFDIR) { 3816 errno = EISDIR; 3817 ::close(fd); 3818 return -1; 3819 } 3820 } else { 3821 ::close(fd); 3822 return -1; 3823 } 3824 } 3825 3826 // All file descriptors that are opened in the JVM and not 3827 // specifically destined for a subprocess should have the 3828 // close-on-exec flag set. If we don't set it, then careless 3rd 3829 // party native code might fork and exec without closing all 3830 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3831 // UNIXProcess.c), and this in turn might: 3832 // 3833 // - cause end-of-file to fail to be detected on some file 3834 // descriptors, resulting in mysterious hangs, or 3835 // 3836 // - might cause an fopen in the subprocess to fail on a system 3837 // suffering from bug 1085341. 3838 // 3839 // (Yes, the default setting of the close-on-exec flag is a Unix 3840 // design flaw) 3841 // 3842 // See: 3843 // 1085341: 32-bit stdio routines should support file descriptors >255 3844 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3845 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3846 // 3847 #ifdef FD_CLOEXEC 3848 { 3849 int flags = ::fcntl(fd, F_GETFD); 3850 if (flags != -1) { 3851 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3852 } 3853 } 3854 #endif 3855 3856 return fd; 3857 } 3858 3859 3860 // create binary file, rewriting existing file if required 3861 int os::create_binary_file(const char* path, bool rewrite_existing) { 3862 int oflags = O_WRONLY | O_CREAT; 3863 if (!rewrite_existing) { 3864 oflags |= O_EXCL; 3865 } 3866 return ::open(path, oflags, S_IREAD | S_IWRITE); 3867 } 3868 3869 // return current position of file pointer 3870 jlong os::current_file_offset(int fd) { 3871 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3872 } 3873 3874 // move file pointer to the specified offset 3875 jlong os::seek_to_file_offset(int fd, jlong offset) { 3876 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3877 } 3878 3879 // This code originates from JDK's sysAvailable 3880 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3881 3882 int os::available(int fd, jlong *bytes) { 3883 jlong cur, end; 3884 int mode; 3885 struct stat buf; 3886 3887 if (::fstat(fd, &buf) >= 0) { 3888 mode = buf.st_mode; 3889 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3890 int n; 3891 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3892 *bytes = n; 3893 return 1; 3894 } 3895 } 3896 } 3897 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3898 return 0; 3899 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3900 return 0; 3901 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3902 return 0; 3903 } 3904 *bytes = end - cur; 3905 return 1; 3906 } 3907 3908 // Map a block of memory. 3909 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3910 char *addr, size_t bytes, bool read_only, 3911 bool allow_exec) { 3912 int prot; 3913 int flags; 3914 3915 if (read_only) { 3916 prot = PROT_READ; 3917 flags = MAP_SHARED; 3918 } else { 3919 prot = PROT_READ | PROT_WRITE; 3920 flags = MAP_PRIVATE; 3921 } 3922 3923 if (allow_exec) { 3924 prot |= PROT_EXEC; 3925 } 3926 3927 if (addr != NULL) { 3928 flags |= MAP_FIXED; 3929 } 3930 3931 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3932 fd, file_offset); 3933 if (mapped_address == MAP_FAILED) { 3934 return NULL; 3935 } 3936 return mapped_address; 3937 } 3938 3939 3940 // Remap a block of memory. 3941 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3942 char *addr, size_t bytes, bool read_only, 3943 bool allow_exec) { 3944 // same as map_memory() on this OS 3945 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3946 allow_exec); 3947 } 3948 3949 3950 // Unmap a block of memory. 3951 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3952 return munmap(addr, bytes) == 0; 3953 } 3954 3955 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3956 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3957 // of a thread. 3958 // 3959 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3960 // the fast estimate available on the platform. 3961 3962 jlong os::current_thread_cpu_time() { 3963 #ifdef __APPLE__ 3964 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3965 #else 3966 Unimplemented(); 3967 return 0; 3968 #endif 3969 } 3970 3971 jlong os::thread_cpu_time(Thread* thread) { 3972 #ifdef __APPLE__ 3973 return os::thread_cpu_time(thread, true /* user + sys */); 3974 #else 3975 Unimplemented(); 3976 return 0; 3977 #endif 3978 } 3979 3980 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3981 #ifdef __APPLE__ 3982 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3983 #else 3984 Unimplemented(); 3985 return 0; 3986 #endif 3987 } 3988 3989 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3990 #ifdef __APPLE__ 3991 struct thread_basic_info tinfo; 3992 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3993 kern_return_t kr; 3994 thread_t mach_thread; 3995 3996 mach_thread = thread->osthread()->thread_id(); 3997 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3998 if (kr != KERN_SUCCESS) { 3999 return -1; 4000 } 4001 4002 if (user_sys_cpu_time) { 4003 jlong nanos; 4004 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 4005 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 4006 return nanos; 4007 } else { 4008 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 4009 } 4010 #else 4011 Unimplemented(); 4012 return 0; 4013 #endif 4014 } 4015 4016 4017 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4018 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4019 info_ptr->may_skip_backward = false; // elapsed time not wall time 4020 info_ptr->may_skip_forward = false; // elapsed time not wall time 4021 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4022 } 4023 4024 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4025 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4026 info_ptr->may_skip_backward = false; // elapsed time not wall time 4027 info_ptr->may_skip_forward = false; // elapsed time not wall time 4028 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4029 } 4030 4031 bool os::is_thread_cpu_time_supported() { 4032 #ifdef __APPLE__ 4033 return true; 4034 #else 4035 return false; 4036 #endif 4037 } 4038 4039 // System loadavg support. Returns -1 if load average cannot be obtained. 4040 // Bsd doesn't yet have a (official) notion of processor sets, 4041 // so just return the system wide load average. 4042 int os::loadavg(double loadavg[], int nelem) { 4043 return ::getloadavg(loadavg, nelem); 4044 } 4045 4046 void os::pause() { 4047 char filename[MAX_PATH]; 4048 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4049 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4050 } else { 4051 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4052 } 4053 4054 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4055 if (fd != -1) { 4056 struct stat buf; 4057 ::close(fd); 4058 while (::stat(filename, &buf) == 0) { 4059 (void)::poll(NULL, 0, 100); 4060 } 4061 } else { 4062 jio_fprintf(stderr, 4063 "Could not open pause file '%s', continuing immediately.\n", filename); 4064 } 4065 } 4066 4067 4068 // Refer to the comments in os_solaris.cpp park-unpark. The next two 4069 // comment paragraphs are worth repeating here: 4070 // 4071 // Assumption: 4072 // Only one parker can exist on an event, which is why we allocate 4073 // them per-thread. Multiple unparkers can coexist. 4074 // 4075 // _Event serves as a restricted-range semaphore. 4076 // -1 : thread is blocked, i.e. there is a waiter 4077 // 0 : neutral: thread is running or ready, 4078 // could have been signaled after a wait started 4079 // 1 : signaled - thread is running or ready 4080 // 4081 4082 // utility to compute the abstime argument to timedwait: 4083 // millis is the relative timeout time 4084 // abstime will be the absolute timeout time 4085 // TODO: replace compute_abstime() with unpackTime() 4086 4087 static struct timespec* compute_abstime(struct timespec* abstime, 4088 jlong millis) { 4089 if (millis < 0) millis = 0; 4090 struct timeval now; 4091 int status = gettimeofday(&now, NULL); 4092 assert(status == 0, "gettimeofday"); 4093 jlong seconds = millis / 1000; 4094 millis %= 1000; 4095 if (seconds > 50000000) { // see man cond_timedwait(3T) 4096 seconds = 50000000; 4097 } 4098 abstime->tv_sec = now.tv_sec + seconds; 4099 long usec = now.tv_usec + millis * 1000; 4100 if (usec >= 1000000) { 4101 abstime->tv_sec += 1; 4102 usec -= 1000000; 4103 } 4104 abstime->tv_nsec = usec * 1000; 4105 return abstime; 4106 } 4107 4108 void os::PlatformEvent::park() { // AKA "down()" 4109 // Transitions for _Event: 4110 // -1 => -1 : illegal 4111 // 1 => 0 : pass - return immediately 4112 // 0 => -1 : block; then set _Event to 0 before returning 4113 4114 // Invariant: Only the thread associated with the Event/PlatformEvent 4115 // may call park(). 4116 // TODO: assert that _Assoc != NULL or _Assoc == Self 4117 assert(_nParked == 0, "invariant"); 4118 4119 int v; 4120 for (;;) { 4121 v = _Event; 4122 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4123 } 4124 guarantee(v >= 0, "invariant"); 4125 if (v == 0) { 4126 // Do this the hard way by blocking ... 4127 int status = pthread_mutex_lock(_mutex); 4128 assert_status(status == 0, status, "mutex_lock"); 4129 guarantee(_nParked == 0, "invariant"); 4130 ++_nParked; 4131 while (_Event < 0) { 4132 status = pthread_cond_wait(_cond, _mutex); 4133 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4134 // Treat this the same as if the wait was interrupted 4135 if (status == ETIMEDOUT) { status = EINTR; } 4136 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4137 } 4138 --_nParked; 4139 4140 _Event = 0; 4141 status = pthread_mutex_unlock(_mutex); 4142 assert_status(status == 0, status, "mutex_unlock"); 4143 // Paranoia to ensure our locked and lock-free paths interact 4144 // correctly with each other. 4145 OrderAccess::fence(); 4146 } 4147 guarantee(_Event >= 0, "invariant"); 4148 } 4149 4150 int os::PlatformEvent::park(jlong millis) { 4151 // Transitions for _Event: 4152 // -1 => -1 : illegal 4153 // 1 => 0 : pass - return immediately 4154 // 0 => -1 : block; then set _Event to 0 before returning 4155 4156 guarantee(_nParked == 0, "invariant"); 4157 4158 int v; 4159 for (;;) { 4160 v = _Event; 4161 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4162 } 4163 guarantee(v >= 0, "invariant"); 4164 if (v != 0) return OS_OK; 4165 4166 // We do this the hard way, by blocking the thread. 4167 // Consider enforcing a minimum timeout value. 4168 struct timespec abst; 4169 compute_abstime(&abst, millis); 4170 4171 int ret = OS_TIMEOUT; 4172 int status = pthread_mutex_lock(_mutex); 4173 assert_status(status == 0, status, "mutex_lock"); 4174 guarantee(_nParked == 0, "invariant"); 4175 ++_nParked; 4176 4177 // Object.wait(timo) will return because of 4178 // (a) notification 4179 // (b) timeout 4180 // (c) thread.interrupt 4181 // 4182 // Thread.interrupt and object.notify{All} both call Event::set. 4183 // That is, we treat thread.interrupt as a special case of notification. 4184 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false. 4185 // We assume all ETIME returns are valid. 4186 // 4187 // TODO: properly differentiate simultaneous notify+interrupt. 4188 // In that case, we should propagate the notify to another waiter. 4189 4190 while (_Event < 0) { 4191 status = pthread_cond_timedwait(_cond, _mutex, &abst); 4192 assert_status(status == 0 || status == EINTR || 4193 status == ETIMEDOUT, 4194 status, "cond_timedwait"); 4195 if (!FilterSpuriousWakeups) break; // previous semantics 4196 if (status == ETIMEDOUT) break; 4197 // We consume and ignore EINTR and spurious wakeups. 4198 } 4199 --_nParked; 4200 if (_Event >= 0) { 4201 ret = OS_OK; 4202 } 4203 _Event = 0; 4204 status = pthread_mutex_unlock(_mutex); 4205 assert_status(status == 0, status, "mutex_unlock"); 4206 assert(_nParked == 0, "invariant"); 4207 // Paranoia to ensure our locked and lock-free paths interact 4208 // correctly with each other. 4209 OrderAccess::fence(); 4210 return ret; 4211 } 4212 4213 void os::PlatformEvent::unpark() { 4214 // Transitions for _Event: 4215 // 0 => 1 : just return 4216 // 1 => 1 : just return 4217 // -1 => either 0 or 1; must signal target thread 4218 // That is, we can safely transition _Event from -1 to either 4219 // 0 or 1. 4220 // See also: "Semaphores in Plan 9" by Mullender & Cox 4221 // 4222 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4223 // that it will take two back-to-back park() calls for the owning 4224 // thread to block. This has the benefit of forcing a spurious return 4225 // from the first park() call after an unpark() call which will help 4226 // shake out uses of park() and unpark() without condition variables. 4227 4228 if (Atomic::xchg(1, &_Event) >= 0) return; 4229 4230 // Wait for the thread associated with the event to vacate 4231 int status = pthread_mutex_lock(_mutex); 4232 assert_status(status == 0, status, "mutex_lock"); 4233 int AnyWaiters = _nParked; 4234 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4235 status = pthread_mutex_unlock(_mutex); 4236 assert_status(status == 0, status, "mutex_unlock"); 4237 if (AnyWaiters != 0) { 4238 // Note that we signal() *after* dropping the lock for "immortal" Events. 4239 // This is safe and avoids a common class of futile wakeups. In rare 4240 // circumstances this can cause a thread to return prematurely from 4241 // cond_{timed}wait() but the spurious wakeup is benign and the victim 4242 // will simply re-test the condition and re-park itself. 4243 // This provides particular benefit if the underlying platform does not 4244 // provide wait morphing. 4245 status = pthread_cond_signal(_cond); 4246 assert_status(status == 0, status, "cond_signal"); 4247 } 4248 } 4249 4250 4251 // JSR166 4252 // ------------------------------------------------------- 4253 4254 // The solaris and bsd implementations of park/unpark are fairly 4255 // conservative for now, but can be improved. They currently use a 4256 // mutex/condvar pair, plus a a count. 4257 // Park decrements count if > 0, else does a condvar wait. Unpark 4258 // sets count to 1 and signals condvar. Only one thread ever waits 4259 // on the condvar. Contention seen when trying to park implies that someone 4260 // is unparking you, so don't wait. And spurious returns are fine, so there 4261 // is no need to track notifications. 4262 4263 #define MAX_SECS 100000000 4264 4265 // This code is common to bsd and solaris and will be moved to a 4266 // common place in dolphin. 4267 // 4268 // The passed in time value is either a relative time in nanoseconds 4269 // or an absolute time in milliseconds. Either way it has to be unpacked 4270 // into suitable seconds and nanoseconds components and stored in the 4271 // given timespec structure. 4272 // Given time is a 64-bit value and the time_t used in the timespec is only 4273 // a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4274 // overflow if times way in the future are given. Further on Solaris versions 4275 // prior to 10 there is a restriction (see cond_timedwait) that the specified 4276 // number of seconds, in abstime, is less than current_time + 100,000,000. 4277 // As it will be 28 years before "now + 100000000" will overflow we can 4278 // ignore overflow and just impose a hard-limit on seconds using the value 4279 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 4280 // years from "now". 4281 4282 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4283 assert(time > 0, "convertTime"); 4284 4285 struct timeval now; 4286 int status = gettimeofday(&now, NULL); 4287 assert(status == 0, "gettimeofday"); 4288 4289 time_t max_secs = now.tv_sec + MAX_SECS; 4290 4291 if (isAbsolute) { 4292 jlong secs = time / 1000; 4293 if (secs > max_secs) { 4294 absTime->tv_sec = max_secs; 4295 } else { 4296 absTime->tv_sec = secs; 4297 } 4298 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4299 } else { 4300 jlong secs = time / NANOSECS_PER_SEC; 4301 if (secs >= MAX_SECS) { 4302 absTime->tv_sec = max_secs; 4303 absTime->tv_nsec = 0; 4304 } else { 4305 absTime->tv_sec = now.tv_sec + secs; 4306 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4307 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4308 absTime->tv_nsec -= NANOSECS_PER_SEC; 4309 ++absTime->tv_sec; // note: this must be <= max_secs 4310 } 4311 } 4312 } 4313 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4314 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4315 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4316 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4317 } 4318 4319 void Parker::park(bool isAbsolute, jlong time) { 4320 // Ideally we'd do something useful while spinning, such 4321 // as calling unpackTime(). 4322 4323 // Optional fast-path check: 4324 // Return immediately if a permit is available. 4325 // We depend on Atomic::xchg() having full barrier semantics 4326 // since we are doing a lock-free update to _counter. 4327 if (Atomic::xchg(0, &_counter) > 0) return; 4328 4329 Thread* thread = Thread::current(); 4330 assert(thread->is_Java_thread(), "Must be JavaThread"); 4331 JavaThread *jt = (JavaThread *)thread; 4332 4333 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4334 // Check interrupt before trying to wait 4335 if (Thread::is_interrupted(thread, false)) { 4336 return; 4337 } 4338 4339 // Next, demultiplex/decode time arguments 4340 struct timespec absTime; 4341 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 4342 return; 4343 } 4344 if (time > 0) { 4345 unpackTime(&absTime, isAbsolute, time); 4346 } 4347 4348 4349 // Enter safepoint region 4350 // Beware of deadlocks such as 6317397. 4351 // The per-thread Parker:: mutex is a classic leaf-lock. 4352 // In particular a thread must never block on the Threads_lock while 4353 // holding the Parker:: mutex. If safepoints are pending both the 4354 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4355 ThreadBlockInVM tbivm(jt); 4356 4357 // Don't wait if cannot get lock since interference arises from 4358 // unblocking. Also. check interrupt before trying wait 4359 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4360 return; 4361 } 4362 4363 int status; 4364 if (_counter > 0) { // no wait needed 4365 _counter = 0; 4366 status = pthread_mutex_unlock(_mutex); 4367 assert_status(status == 0, status, "invariant"); 4368 // Paranoia to ensure our locked and lock-free paths interact 4369 // correctly with each other and Java-level accesses. 4370 OrderAccess::fence(); 4371 return; 4372 } 4373 4374 #ifdef ASSERT 4375 // Don't catch signals while blocked; let the running threads have the signals. 4376 // (This allows a debugger to break into the running thread.) 4377 sigset_t oldsigs; 4378 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4379 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4380 #endif 4381 4382 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4383 jt->set_suspend_equivalent(); 4384 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4385 4386 if (time == 0) { 4387 status = pthread_cond_wait(_cond, _mutex); 4388 } else { 4389 status = pthread_cond_timedwait(_cond, _mutex, &absTime); 4390 } 4391 assert_status(status == 0 || status == EINTR || 4392 status == ETIMEDOUT, 4393 status, "cond_timedwait"); 4394 4395 #ifdef ASSERT 4396 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4397 #endif 4398 4399 _counter = 0; 4400 status = pthread_mutex_unlock(_mutex); 4401 assert_status(status == 0, status, "invariant"); 4402 // Paranoia to ensure our locked and lock-free paths interact 4403 // correctly with each other and Java-level accesses. 4404 OrderAccess::fence(); 4405 4406 // If externally suspended while waiting, re-suspend 4407 if (jt->handle_special_suspend_equivalent_condition()) { 4408 jt->java_suspend_self(); 4409 } 4410 } 4411 4412 void Parker::unpark() { 4413 int status = pthread_mutex_lock(_mutex); 4414 assert_status(status == 0, status, "invariant"); 4415 const int s = _counter; 4416 _counter = 1; 4417 status = pthread_mutex_unlock(_mutex); 4418 assert_status(status == 0, status, "invariant"); 4419 if (s < 1) { 4420 status = pthread_cond_signal(_cond); 4421 assert_status(status == 0, status, "invariant"); 4422 } 4423 } 4424 4425 4426 // Darwin has no "environ" in a dynamic library. 4427 #ifdef __APPLE__ 4428 #include <crt_externs.h> 4429 #define environ (*_NSGetEnviron()) 4430 #else 4431 extern char** environ; 4432 #endif 4433 4434 // Run the specified command in a separate process. Return its exit value, 4435 // or -1 on failure (e.g. can't fork a new process). 4436 // Unlike system(), this function can be called from signal handler. It 4437 // doesn't block SIGINT et al. 4438 int os::fork_and_exec(char* cmd) { 4439 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4440 4441 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4442 // pthread_atfork handlers and reset pthread library. All we need is a 4443 // separate process to execve. Make a direct syscall to fork process. 4444 // On IA64 there's no fork syscall, we have to use fork() and hope for 4445 // the best... 4446 pid_t pid = fork(); 4447 4448 if (pid < 0) { 4449 // fork failed 4450 return -1; 4451 4452 } else if (pid == 0) { 4453 // child process 4454 4455 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4456 // first to kill every thread on the thread list. Because this list is 4457 // not reset by fork() (see notes above), execve() will instead kill 4458 // every thread in the parent process. We know this is the only thread 4459 // in the new process, so make a system call directly. 4460 // IA64 should use normal execve() from glibc to match the glibc fork() 4461 // above. 4462 execve("/bin/sh", (char* const*)argv, environ); 4463 4464 // execve failed 4465 _exit(-1); 4466 4467 } else { 4468 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4469 // care about the actual exit code, for now. 4470 4471 int status; 4472 4473 // Wait for the child process to exit. This returns immediately if 4474 // the child has already exited. */ 4475 while (waitpid(pid, &status, 0) < 0) { 4476 switch (errno) { 4477 case ECHILD: return 0; 4478 case EINTR: break; 4479 default: return -1; 4480 } 4481 } 4482 4483 if (WIFEXITED(status)) { 4484 // The child exited normally; get its exit code. 4485 return WEXITSTATUS(status); 4486 } else if (WIFSIGNALED(status)) { 4487 // The child exited because of a signal 4488 // The best value to return is 0x80 + signal number, 4489 // because that is what all Unix shells do, and because 4490 // it allows callers to distinguish between process exit and 4491 // process death by signal. 4492 return 0x80 + WTERMSIG(status); 4493 } else { 4494 // Unknown exit code; pass it through 4495 return status; 4496 } 4497 } 4498 } 4499 4500 // is_headless_jre() 4501 // 4502 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4503 // in order to report if we are running in a headless jre 4504 // 4505 // Since JDK8 xawt/libmawt.so was moved into the same directory 4506 // as libawt.so, and renamed libawt_xawt.so 4507 // 4508 bool os::is_headless_jre() { 4509 #ifdef __APPLE__ 4510 // We no longer build headless-only on Mac OS X 4511 return false; 4512 #else 4513 struct stat statbuf; 4514 char buf[MAXPATHLEN]; 4515 char libmawtpath[MAXPATHLEN]; 4516 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4517 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4518 char *p; 4519 4520 // Get path to libjvm.so 4521 os::jvm_path(buf, sizeof(buf)); 4522 4523 // Get rid of libjvm.so 4524 p = strrchr(buf, '/'); 4525 if (p == NULL) { 4526 return false; 4527 } else { 4528 *p = '\0'; 4529 } 4530 4531 // Get rid of client or server 4532 p = strrchr(buf, '/'); 4533 if (p == NULL) { 4534 return false; 4535 } else { 4536 *p = '\0'; 4537 } 4538 4539 // check xawt/libmawt.so 4540 strcpy(libmawtpath, buf); 4541 strcat(libmawtpath, xawtstr); 4542 if (::stat(libmawtpath, &statbuf) == 0) return false; 4543 4544 // check libawt_xawt.so 4545 strcpy(libmawtpath, buf); 4546 strcat(libmawtpath, new_xawtstr); 4547 if (::stat(libmawtpath, &statbuf) == 0) return false; 4548 4549 return true; 4550 #endif 4551 } 4552 4553 // Get the default path to the core file 4554 // Returns the length of the string 4555 int os::get_core_path(char* buffer, size_t bufferSize) { 4556 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 4557 4558 // Truncate if theoretical string was longer than bufferSize 4559 n = MIN2(n, (int)bufferSize); 4560 4561 return n; 4562 } 4563 4564 #ifndef PRODUCT 4565 void TestReserveMemorySpecial_test() { 4566 // No tests available for this platform 4567 } 4568 #endif 4569 4570 bool os::start_debugging(char *buf, int buflen) { 4571 int len = (int)strlen(buf); 4572 char *p = &buf[len]; 4573 4574 jio_snprintf(p, buflen-len, 4575 "\n\n" 4576 "Do you want to debug the problem?\n\n" 4577 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 4578 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 4579 "Otherwise, press RETURN to abort...", 4580 os::current_process_id(), os::current_process_id(), 4581 os::current_thread_id(), os::current_thread_id()); 4582 4583 bool yes = os::message_box("Unexpected Error", buf); 4584 4585 if (yes) { 4586 // yes, user asked VM to launch debugger 4587 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 4588 os::current_process_id(), os::current_process_id()); 4589 4590 os::fork_and_exec(buf); 4591 yes = false; 4592 } 4593 return yes; 4594 }