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 *java_start(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 return 0; 727 } 728 729 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 730 assert(thread->osthread() == NULL, "caller responsible"); 731 732 // Allocate the OSThread object 733 OSThread* osthread = new OSThread(NULL, NULL); 734 if (osthread == NULL) { 735 return false; 736 } 737 738 // set the correct thread state 739 osthread->set_thread_type(thr_type); 740 741 // Initial state is ALLOCATED but not INITIALIZED 742 osthread->set_state(ALLOCATED); 743 744 thread->set_osthread(osthread); 745 746 // init thread attributes 747 pthread_attr_t attr; 748 pthread_attr_init(&attr); 749 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 750 751 // calculate stack size if it's not specified by caller 752 if (stack_size == 0) { 753 stack_size = os::Bsd::default_stack_size(thr_type); 754 755 switch (thr_type) { 756 case os::java_thread: 757 // Java threads use ThreadStackSize which default value can be 758 // changed with the flag -Xss 759 assert(JavaThread::stack_size_at_create() > 0, "this should be set"); 760 stack_size = JavaThread::stack_size_at_create(); 761 break; 762 case os::compiler_thread: 763 if (CompilerThreadStackSize > 0) { 764 stack_size = (size_t)(CompilerThreadStackSize * K); 765 break; 766 } // else fall through: 767 // use VMThreadStackSize if CompilerThreadStackSize is not defined 768 case os::vm_thread: 769 case os::pgc_thread: 770 case os::cgc_thread: 771 case os::watcher_thread: 772 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 773 break; 774 } 775 } 776 777 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 778 pthread_attr_setstacksize(&attr, stack_size); 779 780 ThreadState state; 781 782 { 783 pthread_t tid; 784 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 785 786 char buf[64]; 787 if (ret == 0) { 788 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 789 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 790 } else { 791 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", 792 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 793 } 794 795 pthread_attr_destroy(&attr); 796 797 if (ret != 0) { 798 // Need to clean up stuff we've allocated so far 799 thread->set_osthread(NULL); 800 delete osthread; 801 return false; 802 } 803 804 // Store pthread info into the OSThread 805 osthread->set_pthread_id(tid); 806 807 // Wait until child thread is either initialized or aborted 808 { 809 Monitor* sync_with_child = osthread->startThread_lock(); 810 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 811 while ((state = osthread->get_state()) == ALLOCATED) { 812 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 813 } 814 } 815 816 } 817 818 // Aborted due to thread limit being reached 819 if (state == ZOMBIE) { 820 thread->set_osthread(NULL); 821 delete osthread; 822 return false; 823 } 824 825 // The thread is returned suspended (in state INITIALIZED), 826 // and is started higher up in the call chain 827 assert(state == INITIALIZED, "race condition"); 828 return true; 829 } 830 831 ///////////////////////////////////////////////////////////////////////////// 832 // attach existing thread 833 834 // bootstrap the main thread 835 bool os::create_main_thread(JavaThread* thread) { 836 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 837 return create_attached_thread(thread); 838 } 839 840 bool os::create_attached_thread(JavaThread* thread) { 841 #ifdef ASSERT 842 thread->verify_not_published(); 843 #endif 844 845 // Allocate the OSThread object 846 OSThread* osthread = new OSThread(NULL, NULL); 847 848 if (osthread == NULL) { 849 return false; 850 } 851 852 osthread->set_thread_id(os::Bsd::gettid()); 853 854 // Store pthread info into the OSThread 855 #ifdef __APPLE__ 856 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 857 guarantee(unique_thread_id != 0, "just checking"); 858 osthread->set_unique_thread_id(unique_thread_id); 859 #endif 860 osthread->set_pthread_id(::pthread_self()); 861 862 // initialize floating point control register 863 os::Bsd::init_thread_fpu_state(); 864 865 // Initial thread state is RUNNABLE 866 osthread->set_state(RUNNABLE); 867 868 thread->set_osthread(osthread); 869 870 // initialize signal mask for this thread 871 // and save the caller's signal mask 872 os::Bsd::hotspot_sigmask(thread); 873 874 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", 875 os::current_thread_id(), (uintx) pthread_self()); 876 877 return true; 878 } 879 880 void os::pd_start_thread(Thread* thread) { 881 OSThread * osthread = thread->osthread(); 882 assert(osthread->get_state() != INITIALIZED, "just checking"); 883 Monitor* sync_with_child = osthread->startThread_lock(); 884 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 885 sync_with_child->notify(); 886 } 887 888 // Free Bsd resources related to the OSThread 889 void os::free_thread(OSThread* osthread) { 890 assert(osthread != NULL, "osthread not set"); 891 892 if (Thread::current()->osthread() == osthread) { 893 // Restore caller's signal mask 894 sigset_t sigmask = osthread->caller_sigmask(); 895 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 896 } 897 898 delete osthread; 899 } 900 901 //////////////////////////////////////////////////////////////////////////////// 902 // time support 903 904 // Time since start-up in seconds to a fine granularity. 905 // Used by VMSelfDestructTimer and the MemProfiler. 906 double os::elapsedTime() { 907 908 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 909 } 910 911 jlong os::elapsed_counter() { 912 return javaTimeNanos() - initial_time_count; 913 } 914 915 jlong os::elapsed_frequency() { 916 return NANOSECS_PER_SEC; // nanosecond resolution 917 } 918 919 bool os::supports_vtime() { return true; } 920 bool os::enable_vtime() { return false; } 921 bool os::vtime_enabled() { return false; } 922 923 double os::elapsedVTime() { 924 // better than nothing, but not much 925 return elapsedTime(); 926 } 927 928 jlong os::javaTimeMillis() { 929 timeval time; 930 int status = gettimeofday(&time, NULL); 931 assert(status != -1, "bsd error"); 932 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 933 } 934 935 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 936 timeval time; 937 int status = gettimeofday(&time, NULL); 938 assert(status != -1, "bsd error"); 939 seconds = jlong(time.tv_sec); 940 nanos = jlong(time.tv_usec) * 1000; 941 } 942 943 #ifndef __APPLE__ 944 #ifndef CLOCK_MONOTONIC 945 #define CLOCK_MONOTONIC (1) 946 #endif 947 #endif 948 949 #ifdef __APPLE__ 950 void os::Bsd::clock_init() { 951 mach_timebase_info(&_timebase_info); 952 } 953 #else 954 void os::Bsd::clock_init() { 955 struct timespec res; 956 struct timespec tp; 957 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 958 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 959 // yes, monotonic clock is supported 960 _clock_gettime = ::clock_gettime; 961 } 962 } 963 #endif 964 965 966 967 #ifdef __APPLE__ 968 969 jlong os::javaTimeNanos() { 970 const uint64_t tm = mach_absolute_time(); 971 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; 972 const uint64_t prev = Bsd::_max_abstime; 973 if (now <= prev) { 974 return prev; // same or retrograde time; 975 } 976 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev); 977 assert(obsv >= prev, "invariant"); // Monotonicity 978 // If the CAS succeeded then we're done and return "now". 979 // If the CAS failed and the observed value "obsv" is >= now then 980 // we should return "obsv". If the CAS failed and now > obsv > prv then 981 // some other thread raced this thread and installed a new value, in which case 982 // we could either (a) retry the entire operation, (b) retry trying to install now 983 // or (c) just return obsv. We use (c). No loop is required although in some cases 984 // we might discard a higher "now" value in deference to a slightly lower but freshly 985 // installed obsv value. That's entirely benign -- it admits no new orderings compared 986 // to (a) or (b) -- and greatly reduces coherence traffic. 987 // We might also condition (c) on the magnitude of the delta between obsv and now. 988 // Avoiding excessive CAS operations to hot RW locations is critical. 989 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 990 return (prev == obsv) ? now : obsv; 991 } 992 993 #else // __APPLE__ 994 995 jlong os::javaTimeNanos() { 996 if (os::supports_monotonic_clock()) { 997 struct timespec tp; 998 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); 999 assert(status == 0, "gettime error"); 1000 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 1001 return result; 1002 } else { 1003 timeval time; 1004 int status = gettimeofday(&time, NULL); 1005 assert(status != -1, "bsd error"); 1006 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1007 return 1000 * usecs; 1008 } 1009 } 1010 1011 #endif // __APPLE__ 1012 1013 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1014 if (os::supports_monotonic_clock()) { 1015 info_ptr->max_value = ALL_64_BITS; 1016 1017 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1018 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1019 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1020 } else { 1021 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1022 info_ptr->max_value = ALL_64_BITS; 1023 1024 // gettimeofday is a real time clock so it skips 1025 info_ptr->may_skip_backward = true; 1026 info_ptr->may_skip_forward = true; 1027 } 1028 1029 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1030 } 1031 1032 // Return the real, user, and system times in seconds from an 1033 // arbitrary fixed point in the past. 1034 bool os::getTimesSecs(double* process_real_time, 1035 double* process_user_time, 1036 double* process_system_time) { 1037 struct tms ticks; 1038 clock_t real_ticks = times(&ticks); 1039 1040 if (real_ticks == (clock_t) (-1)) { 1041 return false; 1042 } else { 1043 double ticks_per_second = (double) clock_tics_per_sec; 1044 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1045 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1046 *process_real_time = ((double) real_ticks) / ticks_per_second; 1047 1048 return true; 1049 } 1050 } 1051 1052 1053 char * os::local_time_string(char *buf, size_t buflen) { 1054 struct tm t; 1055 time_t long_time; 1056 time(&long_time); 1057 localtime_r(&long_time, &t); 1058 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1059 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1060 t.tm_hour, t.tm_min, t.tm_sec); 1061 return buf; 1062 } 1063 1064 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1065 return localtime_r(clock, res); 1066 } 1067 1068 //////////////////////////////////////////////////////////////////////////////// 1069 // runtime exit support 1070 1071 // Note: os::shutdown() might be called very early during initialization, or 1072 // called from signal handler. Before adding something to os::shutdown(), make 1073 // sure it is async-safe and can handle partially initialized VM. 1074 void os::shutdown() { 1075 1076 // allow PerfMemory to attempt cleanup of any persistent resources 1077 perfMemory_exit(); 1078 1079 // needs to remove object in file system 1080 AttachListener::abort(); 1081 1082 // flush buffered output, finish log files 1083 ostream_abort(); 1084 1085 // Check for abort hook 1086 abort_hook_t abort_hook = Arguments::abort_hook(); 1087 if (abort_hook != NULL) { 1088 abort_hook(); 1089 } 1090 1091 } 1092 1093 // Note: os::abort() might be called very early during initialization, or 1094 // called from signal handler. Before adding something to os::abort(), make 1095 // sure it is async-safe and can handle partially initialized VM. 1096 void os::abort(bool dump_core, void* siginfo, const void* context) { 1097 os::shutdown(); 1098 if (dump_core) { 1099 #ifndef PRODUCT 1100 fdStream out(defaultStream::output_fd()); 1101 out.print_raw("Current thread is "); 1102 char buf[16]; 1103 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1104 out.print_raw_cr(buf); 1105 out.print_raw_cr("Dumping core ..."); 1106 #endif 1107 ::abort(); // dump core 1108 } 1109 1110 ::exit(1); 1111 } 1112 1113 // Die immediately, no exit hook, no abort hook, no cleanup. 1114 void os::die() { 1115 // _exit() on BsdThreads only kills current thread 1116 ::abort(); 1117 } 1118 1119 // This method is a copy of JDK's sysGetLastErrorString 1120 // from src/solaris/hpi/src/system_md.c 1121 1122 size_t os::lasterror(char *buf, size_t len) { 1123 if (errno == 0) return 0; 1124 1125 const char *s = os::strerror(errno); 1126 size_t n = ::strlen(s); 1127 if (n >= len) { 1128 n = len - 1; 1129 } 1130 ::strncpy(buf, s, n); 1131 buf[n] = '\0'; 1132 return n; 1133 } 1134 1135 // Information of current thread in variety of formats 1136 pid_t os::Bsd::gettid() { 1137 int retval = -1; 1138 1139 #ifdef __APPLE__ //XNU kernel 1140 // despite the fact mach port is actually not a thread id use it 1141 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1142 retval = ::pthread_mach_thread_np(::pthread_self()); 1143 guarantee(retval != 0, "just checking"); 1144 return retval; 1145 1146 #else 1147 #ifdef __FreeBSD__ 1148 retval = syscall(SYS_thr_self); 1149 #else 1150 #ifdef __OpenBSD__ 1151 retval = syscall(SYS_getthrid); 1152 #else 1153 #ifdef __NetBSD__ 1154 retval = (pid_t) syscall(SYS__lwp_self); 1155 #endif 1156 #endif 1157 #endif 1158 #endif 1159 1160 if (retval == -1) { 1161 return getpid(); 1162 } 1163 } 1164 1165 intx os::current_thread_id() { 1166 #ifdef __APPLE__ 1167 return (intx)::pthread_mach_thread_np(::pthread_self()); 1168 #else 1169 return (intx)::pthread_self(); 1170 #endif 1171 } 1172 1173 int os::current_process_id() { 1174 1175 // Under the old bsd thread library, bsd gives each thread 1176 // its own process id. Because of this each thread will return 1177 // a different pid if this method were to return the result 1178 // of getpid(2). Bsd provides no api that returns the pid 1179 // of the launcher thread for the vm. This implementation 1180 // returns a unique pid, the pid of the launcher thread 1181 // that starts the vm 'process'. 1182 1183 // Under the NPTL, getpid() returns the same pid as the 1184 // launcher thread rather than a unique pid per thread. 1185 // Use gettid() if you want the old pre NPTL behaviour. 1186 1187 // if you are looking for the result of a call to getpid() that 1188 // returns a unique pid for the calling thread, then look at the 1189 // OSThread::thread_id() method in osThread_bsd.hpp file 1190 1191 return (int)(_initial_pid ? _initial_pid : getpid()); 1192 } 1193 1194 // DLL functions 1195 1196 #define JNI_LIB_PREFIX "lib" 1197 #ifdef __APPLE__ 1198 #define JNI_LIB_SUFFIX ".dylib" 1199 #else 1200 #define JNI_LIB_SUFFIX ".so" 1201 #endif 1202 1203 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1204 1205 // This must be hard coded because it's the system's temporary 1206 // directory not the java application's temp directory, ala java.io.tmpdir. 1207 #ifdef __APPLE__ 1208 // macosx has a secure per-user temporary directory 1209 char temp_path_storage[PATH_MAX]; 1210 const char* os::get_temp_directory() { 1211 static char *temp_path = NULL; 1212 if (temp_path == NULL) { 1213 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1214 if (pathSize == 0 || pathSize > PATH_MAX) { 1215 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1216 } 1217 temp_path = temp_path_storage; 1218 } 1219 return temp_path; 1220 } 1221 #else // __APPLE__ 1222 const char* os::get_temp_directory() { return "/tmp"; } 1223 #endif // __APPLE__ 1224 1225 static bool file_exists(const char* filename) { 1226 struct stat statbuf; 1227 if (filename == NULL || strlen(filename) == 0) { 1228 return false; 1229 } 1230 return os::stat(filename, &statbuf) == 0; 1231 } 1232 1233 bool os::dll_build_name(char* buffer, size_t buflen, 1234 const char* pname, const char* fname) { 1235 bool retval = false; 1236 // Copied from libhpi 1237 const size_t pnamelen = pname ? strlen(pname) : 0; 1238 1239 // Return error on buffer overflow. 1240 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1241 return retval; 1242 } 1243 1244 if (pnamelen == 0) { 1245 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1246 retval = true; 1247 } else if (strchr(pname, *os::path_separator()) != NULL) { 1248 int n; 1249 char** pelements = split_path(pname, &n); 1250 if (pelements == NULL) { 1251 return false; 1252 } 1253 for (int i = 0; i < n; i++) { 1254 // Really shouldn't be NULL, but check can't hurt 1255 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1256 continue; // skip the empty path values 1257 } 1258 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1259 pelements[i], fname); 1260 if (file_exists(buffer)) { 1261 retval = true; 1262 break; 1263 } 1264 } 1265 // release the storage 1266 for (int i = 0; i < n; i++) { 1267 if (pelements[i] != NULL) { 1268 FREE_C_HEAP_ARRAY(char, pelements[i]); 1269 } 1270 } 1271 if (pelements != NULL) { 1272 FREE_C_HEAP_ARRAY(char*, pelements); 1273 } 1274 } else { 1275 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1276 retval = true; 1277 } 1278 return retval; 1279 } 1280 1281 // check if addr is inside libjvm.so 1282 bool os::address_is_in_vm(address addr) { 1283 static address libjvm_base_addr; 1284 Dl_info dlinfo; 1285 1286 if (libjvm_base_addr == NULL) { 1287 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1288 libjvm_base_addr = (address)dlinfo.dli_fbase; 1289 } 1290 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1291 } 1292 1293 if (dladdr((void *)addr, &dlinfo) != 0) { 1294 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1295 } 1296 1297 return false; 1298 } 1299 1300 1301 #define MACH_MAXSYMLEN 256 1302 1303 bool os::dll_address_to_function_name(address addr, char *buf, 1304 int buflen, int *offset, 1305 bool demangle) { 1306 // buf is not optional, but offset is optional 1307 assert(buf != NULL, "sanity check"); 1308 1309 Dl_info dlinfo; 1310 char localbuf[MACH_MAXSYMLEN]; 1311 1312 if (dladdr((void*)addr, &dlinfo) != 0) { 1313 // see if we have a matching symbol 1314 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1315 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1316 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1317 } 1318 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1319 return true; 1320 } 1321 // no matching symbol so try for just file info 1322 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1323 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1324 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1325 return true; 1326 } 1327 } 1328 1329 // Handle non-dynamic manually: 1330 if (dlinfo.dli_fbase != NULL && 1331 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1332 dlinfo.dli_fbase)) { 1333 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { 1334 jio_snprintf(buf, buflen, "%s", localbuf); 1335 } 1336 return true; 1337 } 1338 } 1339 buf[0] = '\0'; 1340 if (offset != NULL) *offset = -1; 1341 return false; 1342 } 1343 1344 // ported from solaris version 1345 bool os::dll_address_to_library_name(address addr, char* buf, 1346 int buflen, int* offset) { 1347 // buf is not optional, but offset is optional 1348 assert(buf != NULL, "sanity check"); 1349 1350 Dl_info dlinfo; 1351 1352 if (dladdr((void*)addr, &dlinfo) != 0) { 1353 if (dlinfo.dli_fname != NULL) { 1354 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1355 } 1356 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1357 *offset = addr - (address)dlinfo.dli_fbase; 1358 } 1359 return true; 1360 } 1361 1362 buf[0] = '\0'; 1363 if (offset) *offset = -1; 1364 return false; 1365 } 1366 1367 // Loads .dll/.so and 1368 // in case of error it checks if .dll/.so was built for the 1369 // same architecture as Hotspot is running on 1370 1371 #ifdef __APPLE__ 1372 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1373 #ifdef STATIC_BUILD 1374 return os::get_default_process_handle(); 1375 #else 1376 void * result= ::dlopen(filename, RTLD_LAZY); 1377 if (result != NULL) { 1378 // Successful loading 1379 return result; 1380 } 1381 1382 // Read system error message into ebuf 1383 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1384 ebuf[ebuflen-1]='\0'; 1385 1386 return NULL; 1387 #endif // STATIC_BUILD 1388 } 1389 #else 1390 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1391 #ifdef STATIC_BUILD 1392 return os::get_default_process_handle(); 1393 #else 1394 void * result= ::dlopen(filename, RTLD_LAZY); 1395 if (result != NULL) { 1396 // Successful loading 1397 return result; 1398 } 1399 1400 Elf32_Ehdr elf_head; 1401 1402 // Read system error message into ebuf 1403 // It may or may not be overwritten below 1404 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1405 ebuf[ebuflen-1]='\0'; 1406 int diag_msg_max_length=ebuflen-strlen(ebuf); 1407 char* diag_msg_buf=ebuf+strlen(ebuf); 1408 1409 if (diag_msg_max_length==0) { 1410 // No more space in ebuf for additional diagnostics message 1411 return NULL; 1412 } 1413 1414 1415 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1416 1417 if (file_descriptor < 0) { 1418 // Can't open library, report dlerror() message 1419 return NULL; 1420 } 1421 1422 bool failed_to_read_elf_head= 1423 (sizeof(elf_head)!= 1424 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1425 1426 ::close(file_descriptor); 1427 if (failed_to_read_elf_head) { 1428 // file i/o error - report dlerror() msg 1429 return NULL; 1430 } 1431 1432 typedef struct { 1433 Elf32_Half code; // Actual value as defined in elf.h 1434 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1435 char elf_class; // 32 or 64 bit 1436 char endianess; // MSB or LSB 1437 char* name; // String representation 1438 } arch_t; 1439 1440 #ifndef EM_486 1441 #define EM_486 6 /* Intel 80486 */ 1442 #endif 1443 1444 #ifndef EM_MIPS_RS3_LE 1445 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1446 #endif 1447 1448 #ifndef EM_PPC64 1449 #define EM_PPC64 21 /* PowerPC64 */ 1450 #endif 1451 1452 #ifndef EM_S390 1453 #define EM_S390 22 /* IBM System/390 */ 1454 #endif 1455 1456 #ifndef EM_IA_64 1457 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1458 #endif 1459 1460 #ifndef EM_X86_64 1461 #define EM_X86_64 62 /* AMD x86-64 */ 1462 #endif 1463 1464 static const arch_t arch_array[]={ 1465 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1466 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1467 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1468 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1469 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1470 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1471 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1472 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1473 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1474 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1475 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1476 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1477 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1478 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1479 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1480 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1481 }; 1482 1483 #if (defined IA32) 1484 static Elf32_Half running_arch_code=EM_386; 1485 #elif (defined AMD64) 1486 static Elf32_Half running_arch_code=EM_X86_64; 1487 #elif (defined IA64) 1488 static Elf32_Half running_arch_code=EM_IA_64; 1489 #elif (defined __sparc) && (defined _LP64) 1490 static Elf32_Half running_arch_code=EM_SPARCV9; 1491 #elif (defined __sparc) && (!defined _LP64) 1492 static Elf32_Half running_arch_code=EM_SPARC; 1493 #elif (defined __powerpc64__) 1494 static Elf32_Half running_arch_code=EM_PPC64; 1495 #elif (defined __powerpc__) 1496 static Elf32_Half running_arch_code=EM_PPC; 1497 #elif (defined ARM) 1498 static Elf32_Half running_arch_code=EM_ARM; 1499 #elif (defined S390) 1500 static Elf32_Half running_arch_code=EM_S390; 1501 #elif (defined ALPHA) 1502 static Elf32_Half running_arch_code=EM_ALPHA; 1503 #elif (defined MIPSEL) 1504 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1505 #elif (defined PARISC) 1506 static Elf32_Half running_arch_code=EM_PARISC; 1507 #elif (defined MIPS) 1508 static Elf32_Half running_arch_code=EM_MIPS; 1509 #elif (defined M68K) 1510 static Elf32_Half running_arch_code=EM_68K; 1511 #else 1512 #error Method os::dll_load requires that one of following is defined:\ 1513 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1514 #endif 1515 1516 // Identify compatability class for VM's architecture and library's architecture 1517 // Obtain string descriptions for architectures 1518 1519 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1520 int running_arch_index=-1; 1521 1522 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1523 if (running_arch_code == arch_array[i].code) { 1524 running_arch_index = i; 1525 } 1526 if (lib_arch.code == arch_array[i].code) { 1527 lib_arch.compat_class = arch_array[i].compat_class; 1528 lib_arch.name = arch_array[i].name; 1529 } 1530 } 1531 1532 assert(running_arch_index != -1, 1533 "Didn't find running architecture code (running_arch_code) in arch_array"); 1534 if (running_arch_index == -1) { 1535 // Even though running architecture detection failed 1536 // we may still continue with reporting dlerror() message 1537 return NULL; 1538 } 1539 1540 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1541 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1542 return NULL; 1543 } 1544 1545 #ifndef S390 1546 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1547 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1548 return NULL; 1549 } 1550 #endif // !S390 1551 1552 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1553 if (lib_arch.name!=NULL) { 1554 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1555 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1556 lib_arch.name, arch_array[running_arch_index].name); 1557 } else { 1558 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1559 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1560 lib_arch.code, 1561 arch_array[running_arch_index].name); 1562 } 1563 } 1564 1565 return NULL; 1566 #endif // STATIC_BUILD 1567 } 1568 #endif // !__APPLE__ 1569 1570 void* os::get_default_process_handle() { 1571 #ifdef __APPLE__ 1572 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY 1573 // to avoid finding unexpected symbols on second (or later) 1574 // loads of a library. 1575 return (void*)::dlopen(NULL, RTLD_FIRST); 1576 #else 1577 return (void*)::dlopen(NULL, RTLD_LAZY); 1578 #endif 1579 } 1580 1581 // XXX: Do we need a lock around this as per Linux? 1582 void* os::dll_lookup(void* handle, const char* name) { 1583 return dlsym(handle, name); 1584 } 1585 1586 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1587 outputStream * out = (outputStream *) param; 1588 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1589 return 0; 1590 } 1591 1592 void os::print_dll_info(outputStream *st) { 1593 st->print_cr("Dynamic libraries:"); 1594 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1595 st->print_cr("Error: Cannot print dynamic libraries."); 1596 } 1597 } 1598 1599 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1600 #ifdef RTLD_DI_LINKMAP 1601 Dl_info dli; 1602 void *handle; 1603 Link_map *map; 1604 Link_map *p; 1605 1606 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1607 dli.dli_fname == NULL) { 1608 return 1; 1609 } 1610 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1611 if (handle == NULL) { 1612 return 1; 1613 } 1614 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1615 if (map == NULL) { 1616 dlclose(handle); 1617 return 1; 1618 } 1619 1620 while (map->l_prev != NULL) 1621 map = map->l_prev; 1622 1623 while (map != NULL) { 1624 // Value for top_address is returned as 0 since we don't have any information about module size 1625 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1626 dlclose(handle); 1627 return 1; 1628 } 1629 map = map->l_next; 1630 } 1631 1632 dlclose(handle); 1633 #elif defined(__APPLE__) 1634 for (uint32_t i = 1; i < _dyld_image_count(); i++) { 1635 // Value for top_address is returned as 0 since we don't have any information about module size 1636 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { 1637 return 1; 1638 } 1639 } 1640 return 0; 1641 #else 1642 return 1; 1643 #endif 1644 } 1645 1646 void os::get_summary_os_info(char* buf, size_t buflen) { 1647 // These buffers are small because we want this to be brief 1648 // and not use a lot of stack while generating the hs_err file. 1649 char os[100]; 1650 size_t size = sizeof(os); 1651 int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; 1652 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { 1653 #ifdef __APPLE__ 1654 strncpy(os, "Darwin", sizeof(os)); 1655 #elif __OpenBSD__ 1656 strncpy(os, "OpenBSD", sizeof(os)); 1657 #else 1658 strncpy(os, "BSD", sizeof(os)); 1659 #endif 1660 } 1661 1662 char release[100]; 1663 size = sizeof(release); 1664 int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; 1665 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { 1666 // if error, leave blank 1667 strncpy(release, "", sizeof(release)); 1668 } 1669 snprintf(buf, buflen, "%s %s", os, release); 1670 } 1671 1672 void os::print_os_info_brief(outputStream* st) { 1673 os::Posix::print_uname_info(st); 1674 } 1675 1676 void os::print_os_info(outputStream* st) { 1677 st->print("OS:"); 1678 1679 os::Posix::print_uname_info(st); 1680 1681 os::Posix::print_rlimit_info(st); 1682 1683 os::Posix::print_load_average(st); 1684 } 1685 1686 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1687 // Nothing to do for now. 1688 } 1689 1690 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1691 unsigned int mhz; 1692 size_t size = sizeof(mhz); 1693 int mib[] = { CTL_HW, HW_CPU_FREQ }; 1694 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { 1695 mhz = 1; // looks like an error but can be divided by 1696 } else { 1697 mhz /= 1000000; // reported in millions 1698 } 1699 1700 char model[100]; 1701 size = sizeof(model); 1702 int mib_model[] = { CTL_HW, HW_MODEL }; 1703 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { 1704 strncpy(model, cpu_arch, sizeof(model)); 1705 } 1706 1707 char machine[100]; 1708 size = sizeof(machine); 1709 int mib_machine[] = { CTL_HW, HW_MACHINE }; 1710 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { 1711 strncpy(machine, "", sizeof(machine)); 1712 } 1713 1714 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); 1715 } 1716 1717 void os::print_memory_info(outputStream* st) { 1718 1719 st->print("Memory:"); 1720 st->print(" %dk page", os::vm_page_size()>>10); 1721 1722 st->print(", physical " UINT64_FORMAT "k", 1723 os::physical_memory() >> 10); 1724 st->print("(" UINT64_FORMAT "k free)", 1725 os::available_memory() >> 10); 1726 st->cr(); 1727 } 1728 1729 static void print_signal_handler(outputStream* st, int sig, 1730 char* buf, size_t buflen); 1731 1732 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1733 st->print_cr("Signal Handlers:"); 1734 print_signal_handler(st, SIGSEGV, buf, buflen); 1735 print_signal_handler(st, SIGBUS , buf, buflen); 1736 print_signal_handler(st, SIGFPE , buf, buflen); 1737 print_signal_handler(st, SIGPIPE, buf, buflen); 1738 print_signal_handler(st, SIGXFSZ, buf, buflen); 1739 print_signal_handler(st, SIGILL , buf, buflen); 1740 print_signal_handler(st, SR_signum, buf, buflen); 1741 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1742 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1743 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1744 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1745 } 1746 1747 static char saved_jvm_path[MAXPATHLEN] = {0}; 1748 1749 // Find the full path to the current module, libjvm 1750 void os::jvm_path(char *buf, jint buflen) { 1751 // Error checking. 1752 if (buflen < MAXPATHLEN) { 1753 assert(false, "must use a large-enough buffer"); 1754 buf[0] = '\0'; 1755 return; 1756 } 1757 // Lazy resolve the path to current module. 1758 if (saved_jvm_path[0] != 0) { 1759 strcpy(buf, saved_jvm_path); 1760 return; 1761 } 1762 1763 char dli_fname[MAXPATHLEN]; 1764 bool ret = dll_address_to_library_name( 1765 CAST_FROM_FN_PTR(address, os::jvm_path), 1766 dli_fname, sizeof(dli_fname), NULL); 1767 assert(ret, "cannot locate libjvm"); 1768 char *rp = NULL; 1769 if (ret && dli_fname[0] != '\0') { 1770 rp = realpath(dli_fname, buf); 1771 } 1772 if (rp == NULL) { 1773 return; 1774 } 1775 1776 if (Arguments::sun_java_launcher_is_altjvm()) { 1777 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1778 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" 1779 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" 1780 // appears at the right place in the string, then assume we are 1781 // installed in a JDK and we're done. Otherwise, check for a 1782 // JAVA_HOME environment variable and construct a path to the JVM 1783 // being overridden. 1784 1785 const char *p = buf + strlen(buf) - 1; 1786 for (int count = 0; p > buf && count < 5; ++count) { 1787 for (--p; p > buf && *p != '/'; --p) 1788 /* empty */ ; 1789 } 1790 1791 if (strncmp(p, "/jre/lib/", 9) != 0) { 1792 // Look for JAVA_HOME in the environment. 1793 char* java_home_var = ::getenv("JAVA_HOME"); 1794 if (java_home_var != NULL && java_home_var[0] != 0) { 1795 char* jrelib_p; 1796 int len; 1797 1798 // Check the current module name "libjvm" 1799 p = strrchr(buf, '/'); 1800 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1801 1802 rp = realpath(java_home_var, buf); 1803 if (rp == NULL) { 1804 return; 1805 } 1806 1807 // determine if this is a legacy image or modules image 1808 // modules image doesn't have "jre" subdirectory 1809 len = strlen(buf); 1810 assert(len < buflen, "Ran out of buffer space"); 1811 jrelib_p = buf + len; 1812 1813 // Add the appropriate library subdir 1814 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1815 if (0 != access(buf, F_OK)) { 1816 snprintf(jrelib_p, buflen-len, "/lib"); 1817 } 1818 1819 // Add the appropriate client or server subdir 1820 len = strlen(buf); 1821 jrelib_p = buf + len; 1822 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1823 if (0 != access(buf, F_OK)) { 1824 snprintf(jrelib_p, buflen-len, "%s", ""); 1825 } 1826 1827 // If the path exists within JAVA_HOME, add the JVM library name 1828 // to complete the path to JVM being overridden. Otherwise fallback 1829 // to the path to the current library. 1830 if (0 == access(buf, F_OK)) { 1831 // Use current module name "libjvm" 1832 len = strlen(buf); 1833 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1834 } else { 1835 // Fall back to path of current library 1836 rp = realpath(dli_fname, buf); 1837 if (rp == NULL) { 1838 return; 1839 } 1840 } 1841 } 1842 } 1843 } 1844 1845 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1846 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1847 } 1848 1849 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1850 // no prefix required, not even "_" 1851 } 1852 1853 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1854 // no suffix required 1855 } 1856 1857 //////////////////////////////////////////////////////////////////////////////// 1858 // sun.misc.Signal support 1859 1860 static volatile jint sigint_count = 0; 1861 1862 static void UserHandler(int sig, void *siginfo, void *context) { 1863 // 4511530 - sem_post is serialized and handled by the manager thread. When 1864 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1865 // don't want to flood the manager thread with sem_post requests. 1866 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { 1867 return; 1868 } 1869 1870 // Ctrl-C is pressed during error reporting, likely because the error 1871 // handler fails to abort. Let VM die immediately. 1872 if (sig == SIGINT && is_error_reported()) { 1873 os::die(); 1874 } 1875 1876 os::signal_notify(sig); 1877 } 1878 1879 void* os::user_handler() { 1880 return CAST_FROM_FN_PTR(void*, UserHandler); 1881 } 1882 1883 extern "C" { 1884 typedef void (*sa_handler_t)(int); 1885 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1886 } 1887 1888 void* os::signal(int signal_number, void* handler) { 1889 struct sigaction sigAct, oldSigAct; 1890 1891 sigfillset(&(sigAct.sa_mask)); 1892 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1893 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1894 1895 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1896 // -1 means registration failed 1897 return (void *)-1; 1898 } 1899 1900 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1901 } 1902 1903 void os::signal_raise(int signal_number) { 1904 ::raise(signal_number); 1905 } 1906 1907 // The following code is moved from os.cpp for making this 1908 // code platform specific, which it is by its very nature. 1909 1910 // Will be modified when max signal is changed to be dynamic 1911 int os::sigexitnum_pd() { 1912 return NSIG; 1913 } 1914 1915 // a counter for each possible signal value 1916 static volatile jint pending_signals[NSIG+1] = { 0 }; 1917 1918 // Bsd(POSIX) specific hand shaking semaphore. 1919 #ifdef __APPLE__ 1920 typedef semaphore_t os_semaphore_t; 1921 1922 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1923 #define SEM_WAIT(sem) semaphore_wait(sem) 1924 #define SEM_POST(sem) semaphore_signal(sem) 1925 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1926 #else 1927 typedef sem_t os_semaphore_t; 1928 1929 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1930 #define SEM_WAIT(sem) sem_wait(&sem) 1931 #define SEM_POST(sem) sem_post(&sem) 1932 #define SEM_DESTROY(sem) sem_destroy(&sem) 1933 #endif 1934 1935 #ifdef __APPLE__ 1936 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. 1937 1938 static const char* sem_init_strerror(kern_return_t value) { 1939 switch (value) { 1940 case KERN_INVALID_ARGUMENT: return "Invalid argument"; 1941 case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; 1942 default: return "Unknown"; 1943 } 1944 } 1945 1946 OSXSemaphore::OSXSemaphore(uint value) { 1947 kern_return_t ret = SEM_INIT(_semaphore, value); 1948 1949 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); 1950 } 1951 1952 OSXSemaphore::~OSXSemaphore() { 1953 SEM_DESTROY(_semaphore); 1954 } 1955 1956 void OSXSemaphore::signal(uint count) { 1957 for (uint i = 0; i < count; i++) { 1958 kern_return_t ret = SEM_POST(_semaphore); 1959 1960 assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); 1961 } 1962 } 1963 1964 void OSXSemaphore::wait() { 1965 kern_return_t ret; 1966 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) { 1967 // Semaphore was interrupted. Retry. 1968 } 1969 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); 1970 } 1971 1972 jlong OSXSemaphore::currenttime() { 1973 struct timeval tv; 1974 gettimeofday(&tv, NULL); 1975 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1976 } 1977 1978 bool OSXSemaphore::trywait() { 1979 return timedwait(0, 0); 1980 } 1981 1982 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { 1983 kern_return_t kr = KERN_ABORTED; 1984 mach_timespec_t waitspec; 1985 waitspec.tv_sec = sec; 1986 waitspec.tv_nsec = nsec; 1987 1988 jlong starttime = currenttime(); 1989 1990 kr = semaphore_timedwait(_semaphore, waitspec); 1991 while (kr == KERN_ABORTED) { 1992 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1993 1994 jlong current = currenttime(); 1995 jlong passedtime = current - starttime; 1996 1997 if (passedtime >= totalwait) { 1998 waitspec.tv_sec = 0; 1999 waitspec.tv_nsec = 0; 2000 } else { 2001 jlong waittime = totalwait - (current - starttime); 2002 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 2003 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 2004 } 2005 2006 kr = semaphore_timedwait(_semaphore, waitspec); 2007 } 2008 2009 return kr == KERN_SUCCESS; 2010 } 2011 2012 #else 2013 // Use POSIX implementation of semaphores. 2014 2015 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2016 struct timespec ts; 2017 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2018 2019 return ts; 2020 } 2021 2022 #endif // __APPLE__ 2023 2024 static os_semaphore_t sig_sem; 2025 2026 #ifdef __APPLE__ 2027 static OSXSemaphore sr_semaphore; 2028 #else 2029 static PosixSemaphore sr_semaphore; 2030 #endif 2031 2032 void os::signal_init_pd() { 2033 // Initialize signal structures 2034 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2035 2036 // Initialize signal semaphore 2037 ::SEM_INIT(sig_sem, 0); 2038 } 2039 2040 void os::signal_notify(int sig) { 2041 Atomic::inc(&pending_signals[sig]); 2042 ::SEM_POST(sig_sem); 2043 } 2044 2045 static int check_pending_signals(bool wait) { 2046 Atomic::store(0, &sigint_count); 2047 for (;;) { 2048 for (int i = 0; i < NSIG + 1; i++) { 2049 jint n = pending_signals[i]; 2050 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2051 return i; 2052 } 2053 } 2054 if (!wait) { 2055 return -1; 2056 } 2057 JavaThread *thread = JavaThread::current(); 2058 ThreadBlockInVM tbivm(thread); 2059 2060 bool threadIsSuspended; 2061 do { 2062 thread->set_suspend_equivalent(); 2063 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2064 ::SEM_WAIT(sig_sem); 2065 2066 // were we externally suspended while we were waiting? 2067 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2068 if (threadIsSuspended) { 2069 // The semaphore has been incremented, but while we were waiting 2070 // another thread suspended us. We don't want to continue running 2071 // while suspended because that would surprise the thread that 2072 // suspended us. 2073 ::SEM_POST(sig_sem); 2074 2075 thread->java_suspend_self(); 2076 } 2077 } while (threadIsSuspended); 2078 } 2079 } 2080 2081 int os::signal_lookup() { 2082 return check_pending_signals(false); 2083 } 2084 2085 int os::signal_wait() { 2086 return check_pending_signals(true); 2087 } 2088 2089 //////////////////////////////////////////////////////////////////////////////// 2090 // Virtual Memory 2091 2092 int os::vm_page_size() { 2093 // Seems redundant as all get out 2094 assert(os::Bsd::page_size() != -1, "must call os::init"); 2095 return os::Bsd::page_size(); 2096 } 2097 2098 // Solaris allocates memory by pages. 2099 int os::vm_allocation_granularity() { 2100 assert(os::Bsd::page_size() != -1, "must call os::init"); 2101 return os::Bsd::page_size(); 2102 } 2103 2104 // Rationale behind this function: 2105 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2106 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2107 // samples for JITted code. Here we create private executable mapping over the code cache 2108 // and then we can use standard (well, almost, as mapping can change) way to provide 2109 // info for the reporting script by storing timestamp and location of symbol 2110 void bsd_wrap_code(char* base, size_t size) { 2111 static volatile jint cnt = 0; 2112 2113 if (!UseOprofile) { 2114 return; 2115 } 2116 2117 char buf[PATH_MAX + 1]; 2118 int num = Atomic::add(1, &cnt); 2119 2120 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2121 os::get_temp_directory(), os::current_process_id(), num); 2122 unlink(buf); 2123 2124 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2125 2126 if (fd != -1) { 2127 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2128 if (rv != (off_t)-1) { 2129 if (::write(fd, "", 1) == 1) { 2130 mmap(base, size, 2131 PROT_READ|PROT_WRITE|PROT_EXEC, 2132 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2133 } 2134 } 2135 ::close(fd); 2136 unlink(buf); 2137 } 2138 } 2139 2140 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2141 int err) { 2142 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2143 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2144 os::errno_name(err), err); 2145 } 2146 2147 // NOTE: Bsd kernel does not really reserve the pages for us. 2148 // All it does is to check if there are enough free pages 2149 // left at the time of mmap(). This could be a potential 2150 // problem. 2151 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2152 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2153 #ifdef __OpenBSD__ 2154 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2155 if (::mprotect(addr, size, prot) == 0) { 2156 return true; 2157 } 2158 #else 2159 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2160 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2161 if (res != (uintptr_t) MAP_FAILED) { 2162 return true; 2163 } 2164 #endif 2165 2166 // Warn about any commit errors we see in non-product builds just 2167 // in case mmap() doesn't work as described on the man page. 2168 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2169 2170 return false; 2171 } 2172 2173 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2174 bool exec) { 2175 // alignment_hint is ignored on this OS 2176 return pd_commit_memory(addr, size, exec); 2177 } 2178 2179 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2180 const char* mesg) { 2181 assert(mesg != NULL, "mesg must be specified"); 2182 if (!pd_commit_memory(addr, size, exec)) { 2183 // add extra info in product mode for vm_exit_out_of_memory(): 2184 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2185 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2186 } 2187 } 2188 2189 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2190 size_t alignment_hint, bool exec, 2191 const char* mesg) { 2192 // alignment_hint is ignored on this OS 2193 pd_commit_memory_or_exit(addr, size, exec, mesg); 2194 } 2195 2196 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2197 } 2198 2199 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2200 ::madvise(addr, bytes, MADV_DONTNEED); 2201 } 2202 2203 void os::numa_make_global(char *addr, size_t bytes) { 2204 } 2205 2206 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2207 } 2208 2209 bool os::numa_topology_changed() { return false; } 2210 2211 size_t os::numa_get_groups_num() { 2212 return 1; 2213 } 2214 2215 int os::numa_get_group_id() { 2216 return 0; 2217 } 2218 2219 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2220 if (size > 0) { 2221 ids[0] = 0; 2222 return 1; 2223 } 2224 return 0; 2225 } 2226 2227 bool os::get_page_info(char *start, page_info* info) { 2228 return false; 2229 } 2230 2231 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2232 return end; 2233 } 2234 2235 2236 bool os::pd_uncommit_memory(char* addr, size_t size) { 2237 #ifdef __OpenBSD__ 2238 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2239 return ::mprotect(addr, size, PROT_NONE) == 0; 2240 #else 2241 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2242 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2243 return res != (uintptr_t) MAP_FAILED; 2244 #endif 2245 } 2246 2247 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2248 return os::commit_memory(addr, size, !ExecMem); 2249 } 2250 2251 // If this is a growable mapping, remove the guard pages entirely by 2252 // munmap()ping them. If not, just call uncommit_memory(). 2253 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2254 return os::uncommit_memory(addr, size); 2255 } 2256 2257 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2258 // at 'requested_addr'. If there are existing memory mappings at the same 2259 // location, however, they will be overwritten. If 'fixed' is false, 2260 // 'requested_addr' is only treated as a hint, the return value may or 2261 // may not start from the requested address. Unlike Bsd mmap(), this 2262 // function returns NULL to indicate failure. 2263 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2264 char * addr; 2265 int flags; 2266 2267 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2268 if (fixed) { 2269 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2270 flags |= MAP_FIXED; 2271 } 2272 2273 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2274 // touch an uncommitted page. Otherwise, the read/write might 2275 // succeed if we have enough swap space to back the physical page. 2276 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2277 flags, -1, 0); 2278 2279 return addr == MAP_FAILED ? NULL : addr; 2280 } 2281 2282 static int anon_munmap(char * addr, size_t size) { 2283 return ::munmap(addr, size) == 0; 2284 } 2285 2286 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2287 size_t alignment_hint) { 2288 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2289 } 2290 2291 bool os::pd_release_memory(char* addr, size_t size) { 2292 return anon_munmap(addr, size); 2293 } 2294 2295 static bool bsd_mprotect(char* addr, size_t size, int prot) { 2296 // Bsd wants the mprotect address argument to be page aligned. 2297 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2298 2299 // According to SUSv3, mprotect() should only be used with mappings 2300 // established by mmap(), and mmap() always maps whole pages. Unaligned 2301 // 'addr' likely indicates problem in the VM (e.g. trying to change 2302 // protection of malloc'ed or statically allocated memory). Check the 2303 // caller if you hit this assert. 2304 assert(addr == bottom, "sanity check"); 2305 2306 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2307 return ::mprotect(bottom, size, prot) == 0; 2308 } 2309 2310 // Set protections specified 2311 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2312 bool is_committed) { 2313 unsigned int p = 0; 2314 switch (prot) { 2315 case MEM_PROT_NONE: p = PROT_NONE; break; 2316 case MEM_PROT_READ: p = PROT_READ; break; 2317 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2318 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2319 default: 2320 ShouldNotReachHere(); 2321 } 2322 // is_committed is unused. 2323 return bsd_mprotect(addr, bytes, p); 2324 } 2325 2326 bool os::guard_memory(char* addr, size_t size) { 2327 return bsd_mprotect(addr, size, PROT_NONE); 2328 } 2329 2330 bool os::unguard_memory(char* addr, size_t size) { 2331 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2332 } 2333 2334 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2335 return false; 2336 } 2337 2338 // Large page support 2339 2340 static size_t _large_page_size = 0; 2341 2342 void os::large_page_init() { 2343 } 2344 2345 2346 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2347 fatal("This code is not used or maintained."); 2348 2349 // "exec" is passed in but not used. Creating the shared image for 2350 // the code cache doesn't have an SHM_X executable permission to check. 2351 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2352 2353 key_t key = IPC_PRIVATE; 2354 char *addr; 2355 2356 bool warn_on_failure = UseLargePages && 2357 (!FLAG_IS_DEFAULT(UseLargePages) || 2358 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); 2359 2360 // Create a large shared memory region to attach to based on size. 2361 // Currently, size is the total size of the heap 2362 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2363 if (shmid == -1) { 2364 // Possible reasons for shmget failure: 2365 // 1. shmmax is too small for Java heap. 2366 // > check shmmax value: cat /proc/sys/kernel/shmmax 2367 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2368 // 2. not enough large page memory. 2369 // > check available large pages: cat /proc/meminfo 2370 // > increase amount of large pages: 2371 // echo new_value > /proc/sys/vm/nr_hugepages 2372 // Note 1: different Bsd may use different name for this property, 2373 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2374 // Note 2: it's possible there's enough physical memory available but 2375 // they are so fragmented after a long run that they can't 2376 // coalesce into large pages. Try to reserve large pages when 2377 // the system is still "fresh". 2378 if (warn_on_failure) { 2379 warning("Failed to reserve shared memory (errno = %d).", errno); 2380 } 2381 return NULL; 2382 } 2383 2384 // attach to the region 2385 addr = (char*)shmat(shmid, req_addr, 0); 2386 int err = errno; 2387 2388 // Remove shmid. If shmat() is successful, the actual shared memory segment 2389 // will be deleted when it's detached by shmdt() or when the process 2390 // terminates. If shmat() is not successful this will remove the shared 2391 // segment immediately. 2392 shmctl(shmid, IPC_RMID, NULL); 2393 2394 if ((intptr_t)addr == -1) { 2395 if (warn_on_failure) { 2396 warning("Failed to attach shared memory (errno = %d).", err); 2397 } 2398 return NULL; 2399 } 2400 2401 // The memory is committed 2402 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 2403 2404 return addr; 2405 } 2406 2407 bool os::release_memory_special(char* base, size_t bytes) { 2408 if (MemTracker::tracking_level() > NMT_minimal) { 2409 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2410 // detaching the SHM segment will also delete it, see reserve_memory_special() 2411 int rslt = shmdt(base); 2412 if (rslt == 0) { 2413 tkr.record((address)base, bytes); 2414 return true; 2415 } else { 2416 return false; 2417 } 2418 } else { 2419 return shmdt(base) == 0; 2420 } 2421 } 2422 2423 size_t os::large_page_size() { 2424 return _large_page_size; 2425 } 2426 2427 // HugeTLBFS allows application to commit large page memory on demand; 2428 // with SysV SHM the entire memory region must be allocated as shared 2429 // memory. 2430 bool os::can_commit_large_page_memory() { 2431 return UseHugeTLBFS; 2432 } 2433 2434 bool os::can_execute_large_page_memory() { 2435 return UseHugeTLBFS; 2436 } 2437 2438 // Reserve memory at an arbitrary address, only if that area is 2439 // available (and not reserved for something else). 2440 2441 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2442 const int max_tries = 10; 2443 char* base[max_tries]; 2444 size_t size[max_tries]; 2445 const size_t gap = 0x000000; 2446 2447 // Assert only that the size is a multiple of the page size, since 2448 // that's all that mmap requires, and since that's all we really know 2449 // about at this low abstraction level. If we need higher alignment, 2450 // we can either pass an alignment to this method or verify alignment 2451 // in one of the methods further up the call chain. See bug 5044738. 2452 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2453 2454 // Repeatedly allocate blocks until the block is allocated at the 2455 // right spot. 2456 2457 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2458 // if kernel honors the hint then we can return immediately. 2459 char * addr = anon_mmap(requested_addr, bytes, false); 2460 if (addr == requested_addr) { 2461 return requested_addr; 2462 } 2463 2464 if (addr != NULL) { 2465 // mmap() is successful but it fails to reserve at the requested address 2466 anon_munmap(addr, bytes); 2467 } 2468 2469 int i; 2470 for (i = 0; i < max_tries; ++i) { 2471 base[i] = reserve_memory(bytes); 2472 2473 if (base[i] != NULL) { 2474 // Is this the block we wanted? 2475 if (base[i] == requested_addr) { 2476 size[i] = bytes; 2477 break; 2478 } 2479 2480 // Does this overlap the block we wanted? Give back the overlapped 2481 // parts and try again. 2482 2483 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2484 if (top_overlap >= 0 && top_overlap < bytes) { 2485 unmap_memory(base[i], top_overlap); 2486 base[i] += top_overlap; 2487 size[i] = bytes - top_overlap; 2488 } else { 2489 size_t bottom_overlap = base[i] + bytes - requested_addr; 2490 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2491 unmap_memory(requested_addr, bottom_overlap); 2492 size[i] = bytes - bottom_overlap; 2493 } else { 2494 size[i] = bytes; 2495 } 2496 } 2497 } 2498 } 2499 2500 // Give back the unused reserved pieces. 2501 2502 for (int j = 0; j < i; ++j) { 2503 if (base[j] != NULL) { 2504 unmap_memory(base[j], size[j]); 2505 } 2506 } 2507 2508 if (i < max_tries) { 2509 return requested_addr; 2510 } else { 2511 return NULL; 2512 } 2513 } 2514 2515 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2516 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2517 } 2518 2519 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2520 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); 2521 } 2522 2523 void os::naked_short_sleep(jlong ms) { 2524 struct timespec req; 2525 2526 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2527 req.tv_sec = 0; 2528 if (ms > 0) { 2529 req.tv_nsec = (ms % 1000) * 1000000; 2530 } else { 2531 req.tv_nsec = 1; 2532 } 2533 2534 nanosleep(&req, NULL); 2535 2536 return; 2537 } 2538 2539 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2540 void os::infinite_sleep() { 2541 while (true) { // sleep forever ... 2542 ::sleep(100); // ... 100 seconds at a time 2543 } 2544 } 2545 2546 // Used to convert frequent JVM_Yield() to nops 2547 bool os::dont_yield() { 2548 return DontYieldALot; 2549 } 2550 2551 void os::naked_yield() { 2552 sched_yield(); 2553 } 2554 2555 //////////////////////////////////////////////////////////////////////////////// 2556 // thread priority support 2557 2558 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2559 // only supports dynamic priority, static priority must be zero. For real-time 2560 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 2561 // However, for large multi-threaded applications, SCHED_RR is not only slower 2562 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2563 // of 5 runs - Sep 2005). 2564 // 2565 // The following code actually changes the niceness of kernel-thread/LWP. It 2566 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 2567 // not the entire user process, and user level threads are 1:1 mapped to kernel 2568 // threads. It has always been the case, but could change in the future. For 2569 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2570 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2571 2572 #if !defined(__APPLE__) 2573 int os::java_to_os_priority[CriticalPriority + 1] = { 2574 19, // 0 Entry should never be used 2575 2576 0, // 1 MinPriority 2577 3, // 2 2578 6, // 3 2579 2580 10, // 4 2581 15, // 5 NormPriority 2582 18, // 6 2583 2584 21, // 7 2585 25, // 8 2586 28, // 9 NearMaxPriority 2587 2588 31, // 10 MaxPriority 2589 2590 31 // 11 CriticalPriority 2591 }; 2592 #else 2593 // Using Mach high-level priority assignments 2594 int os::java_to_os_priority[CriticalPriority + 1] = { 2595 0, // 0 Entry should never be used (MINPRI_USER) 2596 2597 27, // 1 MinPriority 2598 28, // 2 2599 29, // 3 2600 2601 30, // 4 2602 31, // 5 NormPriority (BASEPRI_DEFAULT) 2603 32, // 6 2604 2605 33, // 7 2606 34, // 8 2607 35, // 9 NearMaxPriority 2608 2609 36, // 10 MaxPriority 2610 2611 36 // 11 CriticalPriority 2612 }; 2613 #endif 2614 2615 static int prio_init() { 2616 if (ThreadPriorityPolicy == 1) { 2617 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2618 // if effective uid is not root. Perhaps, a more elegant way of doing 2619 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2620 if (geteuid() != 0) { 2621 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2622 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2623 } 2624 ThreadPriorityPolicy = 0; 2625 } 2626 } 2627 if (UseCriticalJavaThreadPriority) { 2628 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2629 } 2630 return 0; 2631 } 2632 2633 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2634 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2635 2636 #ifdef __OpenBSD__ 2637 // OpenBSD pthread_setprio starves low priority threads 2638 return OS_OK; 2639 #elif defined(__FreeBSD__) 2640 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2641 #elif defined(__APPLE__) || defined(__NetBSD__) 2642 struct sched_param sp; 2643 int policy; 2644 pthread_t self = pthread_self(); 2645 2646 if (pthread_getschedparam(self, &policy, &sp) != 0) { 2647 return OS_ERR; 2648 } 2649 2650 sp.sched_priority = newpri; 2651 if (pthread_setschedparam(self, policy, &sp) != 0) { 2652 return OS_ERR; 2653 } 2654 2655 return OS_OK; 2656 #else 2657 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2658 return (ret == 0) ? OS_OK : OS_ERR; 2659 #endif 2660 } 2661 2662 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2663 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2664 *priority_ptr = java_to_os_priority[NormPriority]; 2665 return OS_OK; 2666 } 2667 2668 errno = 0; 2669 #if defined(__OpenBSD__) || defined(__FreeBSD__) 2670 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2671 #elif defined(__APPLE__) || defined(__NetBSD__) 2672 int policy; 2673 struct sched_param sp; 2674 2675 pthread_getschedparam(pthread_self(), &policy, &sp); 2676 *priority_ptr = sp.sched_priority; 2677 #else 2678 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2679 #endif 2680 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2681 } 2682 2683 // Hint to the underlying OS that a task switch would not be good. 2684 // Void return because it's a hint and can fail. 2685 void os::hint_no_preempt() {} 2686 2687 //////////////////////////////////////////////////////////////////////////////// 2688 // suspend/resume support 2689 2690 // the low-level signal-based suspend/resume support is a remnant from the 2691 // old VM-suspension that used to be for java-suspension, safepoints etc, 2692 // within hotspot. Now there is a single use-case for this: 2693 // - calling get_thread_pc() on the VMThread by the flat-profiler task 2694 // that runs in the watcher thread. 2695 // The remaining code is greatly simplified from the more general suspension 2696 // code that used to be used. 2697 // 2698 // The protocol is quite simple: 2699 // - suspend: 2700 // - sends a signal to the target thread 2701 // - polls the suspend state of the osthread using a yield loop 2702 // - target thread signal handler (SR_handler) sets suspend state 2703 // and blocks in sigsuspend until continued 2704 // - resume: 2705 // - sets target osthread state to continue 2706 // - sends signal to end the sigsuspend loop in the SR_handler 2707 // 2708 // Note that the SR_lock plays no role in this suspend/resume protocol. 2709 2710 static void resume_clear_context(OSThread *osthread) { 2711 osthread->set_ucontext(NULL); 2712 osthread->set_siginfo(NULL); 2713 } 2714 2715 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2716 osthread->set_ucontext(context); 2717 osthread->set_siginfo(siginfo); 2718 } 2719 2720 // Handler function invoked when a thread's execution is suspended or 2721 // resumed. We have to be careful that only async-safe functions are 2722 // called here (Note: most pthread functions are not async safe and 2723 // should be avoided.) 2724 // 2725 // Note: sigwait() is a more natural fit than sigsuspend() from an 2726 // interface point of view, but sigwait() prevents the signal hander 2727 // from being run. libpthread would get very confused by not having 2728 // its signal handlers run and prevents sigwait()'s use with the 2729 // mutex granting granting signal. 2730 // 2731 // Currently only ever called on the VMThread or JavaThread 2732 // 2733 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2734 // Save and restore errno to avoid confusing native code with EINTR 2735 // after sigsuspend. 2736 int old_errno = errno; 2737 2738 Thread* thread = Thread::current(); 2739 OSThread* osthread = thread->osthread(); 2740 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2741 2742 os::SuspendResume::State current = osthread->sr.state(); 2743 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2744 suspend_save_context(osthread, siginfo, context); 2745 2746 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2747 os::SuspendResume::State state = osthread->sr.suspended(); 2748 if (state == os::SuspendResume::SR_SUSPENDED) { 2749 sigset_t suspend_set; // signals for sigsuspend() 2750 2751 // get current set of blocked signals and unblock resume signal 2752 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2753 sigdelset(&suspend_set, SR_signum); 2754 2755 sr_semaphore.signal(); 2756 // wait here until we are resumed 2757 while (1) { 2758 sigsuspend(&suspend_set); 2759 2760 os::SuspendResume::State result = osthread->sr.running(); 2761 if (result == os::SuspendResume::SR_RUNNING) { 2762 sr_semaphore.signal(); 2763 break; 2764 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2765 ShouldNotReachHere(); 2766 } 2767 } 2768 2769 } else if (state == os::SuspendResume::SR_RUNNING) { 2770 // request was cancelled, continue 2771 } else { 2772 ShouldNotReachHere(); 2773 } 2774 2775 resume_clear_context(osthread); 2776 } else if (current == os::SuspendResume::SR_RUNNING) { 2777 // request was cancelled, continue 2778 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2779 // ignore 2780 } else { 2781 // ignore 2782 } 2783 2784 errno = old_errno; 2785 } 2786 2787 2788 static int SR_initialize() { 2789 struct sigaction act; 2790 char *s; 2791 // Get signal number to use for suspend/resume 2792 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2793 int sig = ::strtol(s, 0, 10); 2794 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2795 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2796 SR_signum = sig; 2797 } else { 2798 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2799 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2800 } 2801 } 2802 2803 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2804 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2805 2806 sigemptyset(&SR_sigset); 2807 sigaddset(&SR_sigset, SR_signum); 2808 2809 // Set up signal handler for suspend/resume 2810 act.sa_flags = SA_RESTART|SA_SIGINFO; 2811 act.sa_handler = (void (*)(int)) SR_handler; 2812 2813 // SR_signum is blocked by default. 2814 // 4528190 - We also need to block pthread restart signal (32 on all 2815 // supported Bsd platforms). Note that BsdThreads need to block 2816 // this signal for all threads to work properly. So we don't have 2817 // to use hard-coded signal number when setting up the mask. 2818 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2819 2820 if (sigaction(SR_signum, &act, 0) == -1) { 2821 return -1; 2822 } 2823 2824 // Save signal flag 2825 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2826 return 0; 2827 } 2828 2829 static int sr_notify(OSThread* osthread) { 2830 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2831 assert_status(status == 0, status, "pthread_kill"); 2832 return status; 2833 } 2834 2835 // "Randomly" selected value for how long we want to spin 2836 // before bailing out on suspending a thread, also how often 2837 // we send a signal to a thread we want to resume 2838 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2839 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2840 2841 // returns true on success and false on error - really an error is fatal 2842 // but this seems the normal response to library errors 2843 static bool do_suspend(OSThread* osthread) { 2844 assert(osthread->sr.is_running(), "thread should be running"); 2845 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2846 2847 // mark as suspended and send signal 2848 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2849 // failed to switch, state wasn't running? 2850 ShouldNotReachHere(); 2851 return false; 2852 } 2853 2854 if (sr_notify(osthread) != 0) { 2855 ShouldNotReachHere(); 2856 } 2857 2858 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2859 while (true) { 2860 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2861 break; 2862 } else { 2863 // timeout 2864 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2865 if (cancelled == os::SuspendResume::SR_RUNNING) { 2866 return false; 2867 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2868 // make sure that we consume the signal on the semaphore as well 2869 sr_semaphore.wait(); 2870 break; 2871 } else { 2872 ShouldNotReachHere(); 2873 return false; 2874 } 2875 } 2876 } 2877 2878 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2879 return true; 2880 } 2881 2882 static void do_resume(OSThread* osthread) { 2883 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2884 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2885 2886 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2887 // failed to switch to WAKEUP_REQUEST 2888 ShouldNotReachHere(); 2889 return; 2890 } 2891 2892 while (true) { 2893 if (sr_notify(osthread) == 0) { 2894 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2895 if (osthread->sr.is_running()) { 2896 return; 2897 } 2898 } 2899 } else { 2900 ShouldNotReachHere(); 2901 } 2902 } 2903 2904 guarantee(osthread->sr.is_running(), "Must be running!"); 2905 } 2906 2907 /////////////////////////////////////////////////////////////////////////////////// 2908 // signal handling (except suspend/resume) 2909 2910 // This routine may be used by user applications as a "hook" to catch signals. 2911 // The user-defined signal handler must pass unrecognized signals to this 2912 // routine, and if it returns true (non-zero), then the signal handler must 2913 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2914 // routine will never retun false (zero), but instead will execute a VM panic 2915 // routine kill the process. 2916 // 2917 // If this routine returns false, it is OK to call it again. This allows 2918 // the user-defined signal handler to perform checks either before or after 2919 // the VM performs its own checks. Naturally, the user code would be making 2920 // a serious error if it tried to handle an exception (such as a null check 2921 // or breakpoint) that the VM was generating for its own correct operation. 2922 // 2923 // This routine may recognize any of the following kinds of signals: 2924 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2925 // It should be consulted by handlers for any of those signals. 2926 // 2927 // The caller of this routine must pass in the three arguments supplied 2928 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2929 // field of the structure passed to sigaction(). This routine assumes that 2930 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2931 // 2932 // Note that the VM will print warnings if it detects conflicting signal 2933 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2934 // 2935 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 2936 void* ucontext, 2937 int abort_if_unrecognized); 2938 2939 void signalHandler(int sig, siginfo_t* info, void* uc) { 2940 assert(info != NULL && uc != NULL, "it must be old kernel"); 2941 int orig_errno = errno; // Preserve errno value over signal handler. 2942 JVM_handle_bsd_signal(sig, info, uc, true); 2943 errno = orig_errno; 2944 } 2945 2946 2947 // This boolean allows users to forward their own non-matching signals 2948 // to JVM_handle_bsd_signal, harmlessly. 2949 bool os::Bsd::signal_handlers_are_installed = false; 2950 2951 // For signal-chaining 2952 struct sigaction sigact[NSIG]; 2953 uint32_t sigs = 0; 2954 #if (32 < NSIG-1) 2955 #error "Not all signals can be encoded in sigs. Adapt its type!" 2956 #endif 2957 bool os::Bsd::libjsig_is_loaded = false; 2958 typedef struct sigaction *(*get_signal_t)(int); 2959 get_signal_t os::Bsd::get_signal_action = NULL; 2960 2961 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 2962 struct sigaction *actp = NULL; 2963 2964 if (libjsig_is_loaded) { 2965 // Retrieve the old signal handler from libjsig 2966 actp = (*get_signal_action)(sig); 2967 } 2968 if (actp == NULL) { 2969 // Retrieve the preinstalled signal handler from jvm 2970 actp = get_preinstalled_handler(sig); 2971 } 2972 2973 return actp; 2974 } 2975 2976 static bool call_chained_handler(struct sigaction *actp, int sig, 2977 siginfo_t *siginfo, void *context) { 2978 // Call the old signal handler 2979 if (actp->sa_handler == SIG_DFL) { 2980 // It's more reasonable to let jvm treat it as an unexpected exception 2981 // instead of taking the default action. 2982 return false; 2983 } else if (actp->sa_handler != SIG_IGN) { 2984 if ((actp->sa_flags & SA_NODEFER) == 0) { 2985 // automaticlly block the signal 2986 sigaddset(&(actp->sa_mask), sig); 2987 } 2988 2989 sa_handler_t hand; 2990 sa_sigaction_t sa; 2991 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 2992 // retrieve the chained handler 2993 if (siginfo_flag_set) { 2994 sa = actp->sa_sigaction; 2995 } else { 2996 hand = actp->sa_handler; 2997 } 2998 2999 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3000 actp->sa_handler = SIG_DFL; 3001 } 3002 3003 // try to honor the signal mask 3004 sigset_t oset; 3005 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3006 3007 // call into the chained handler 3008 if (siginfo_flag_set) { 3009 (*sa)(sig, siginfo, context); 3010 } else { 3011 (*hand)(sig); 3012 } 3013 3014 // restore the signal mask 3015 pthread_sigmask(SIG_SETMASK, &oset, 0); 3016 } 3017 // Tell jvm's signal handler the signal is taken care of. 3018 return true; 3019 } 3020 3021 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3022 bool chained = false; 3023 // signal-chaining 3024 if (UseSignalChaining) { 3025 struct sigaction *actp = get_chained_signal_action(sig); 3026 if (actp != NULL) { 3027 chained = call_chained_handler(actp, sig, siginfo, context); 3028 } 3029 } 3030 return chained; 3031 } 3032 3033 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3034 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { 3035 return &sigact[sig]; 3036 } 3037 return NULL; 3038 } 3039 3040 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3041 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3042 sigact[sig] = oldAct; 3043 sigs |= (uint32_t)1 << (sig-1); 3044 } 3045 3046 // for diagnostic 3047 int sigflags[NSIG]; 3048 3049 int os::Bsd::get_our_sigflags(int sig) { 3050 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3051 return sigflags[sig]; 3052 } 3053 3054 void os::Bsd::set_our_sigflags(int sig, int flags) { 3055 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3056 if (sig > 0 && sig < NSIG) { 3057 sigflags[sig] = flags; 3058 } 3059 } 3060 3061 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3062 // Check for overwrite. 3063 struct sigaction oldAct; 3064 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3065 3066 void* oldhand = oldAct.sa_sigaction 3067 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3068 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3069 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3070 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3071 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3072 if (AllowUserSignalHandlers || !set_installed) { 3073 // Do not overwrite; user takes responsibility to forward to us. 3074 return; 3075 } else if (UseSignalChaining) { 3076 // save the old handler in jvm 3077 save_preinstalled_handler(sig, oldAct); 3078 // libjsig also interposes the sigaction() call below and saves the 3079 // old sigaction on it own. 3080 } else { 3081 fatal("Encountered unexpected pre-existing sigaction handler " 3082 "%#lx for signal %d.", (long)oldhand, sig); 3083 } 3084 } 3085 3086 struct sigaction sigAct; 3087 sigfillset(&(sigAct.sa_mask)); 3088 sigAct.sa_handler = SIG_DFL; 3089 if (!set_installed) { 3090 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3091 } else { 3092 sigAct.sa_sigaction = signalHandler; 3093 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3094 } 3095 #ifdef __APPLE__ 3096 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3097 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3098 // if the signal handler declares it will handle it on alternate stack. 3099 // Notice we only declare we will handle it on alt stack, but we are not 3100 // actually going to use real alt stack - this is just a workaround. 3101 // Please see ux_exception.c, method catch_mach_exception_raise for details 3102 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3103 if (sig == SIGSEGV) { 3104 sigAct.sa_flags |= SA_ONSTACK; 3105 } 3106 #endif 3107 3108 // Save flags, which are set by ours 3109 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3110 sigflags[sig] = sigAct.sa_flags; 3111 3112 int ret = sigaction(sig, &sigAct, &oldAct); 3113 assert(ret == 0, "check"); 3114 3115 void* oldhand2 = oldAct.sa_sigaction 3116 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3117 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3118 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3119 } 3120 3121 // install signal handlers for signals that HotSpot needs to 3122 // handle in order to support Java-level exception handling. 3123 3124 void os::Bsd::install_signal_handlers() { 3125 if (!signal_handlers_are_installed) { 3126 signal_handlers_are_installed = true; 3127 3128 // signal-chaining 3129 typedef void (*signal_setting_t)(); 3130 signal_setting_t begin_signal_setting = NULL; 3131 signal_setting_t end_signal_setting = NULL; 3132 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3133 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3134 if (begin_signal_setting != NULL) { 3135 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3136 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3137 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3138 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3139 libjsig_is_loaded = true; 3140 assert(UseSignalChaining, "should enable signal-chaining"); 3141 } 3142 if (libjsig_is_loaded) { 3143 // Tell libjsig jvm is setting signal handlers 3144 (*begin_signal_setting)(); 3145 } 3146 3147 set_signal_handler(SIGSEGV, true); 3148 set_signal_handler(SIGPIPE, true); 3149 set_signal_handler(SIGBUS, true); 3150 set_signal_handler(SIGILL, true); 3151 set_signal_handler(SIGFPE, true); 3152 set_signal_handler(SIGXFSZ, true); 3153 3154 #if defined(__APPLE__) 3155 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3156 // signals caught and handled by the JVM. To work around this, we reset the mach task 3157 // signal handler that's placed on our process by CrashReporter. This disables 3158 // CrashReporter-based reporting. 3159 // 3160 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3161 // on caught fatal signals. 3162 // 3163 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3164 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3165 // exception handling, while leaving the standard BSD signal handlers functional. 3166 kern_return_t kr; 3167 kr = task_set_exception_ports(mach_task_self(), 3168 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3169 MACH_PORT_NULL, 3170 EXCEPTION_STATE_IDENTITY, 3171 MACHINE_THREAD_STATE); 3172 3173 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3174 #endif 3175 3176 if (libjsig_is_loaded) { 3177 // Tell libjsig jvm finishes setting signal handlers 3178 (*end_signal_setting)(); 3179 } 3180 3181 // We don't activate signal checker if libjsig is in place, we trust ourselves 3182 // and if UserSignalHandler is installed all bets are off 3183 if (CheckJNICalls) { 3184 if (libjsig_is_loaded) { 3185 if (PrintJNIResolving) { 3186 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3187 } 3188 check_signals = false; 3189 } 3190 if (AllowUserSignalHandlers) { 3191 if (PrintJNIResolving) { 3192 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3193 } 3194 check_signals = false; 3195 } 3196 } 3197 } 3198 } 3199 3200 3201 ///// 3202 // glibc on Bsd platform uses non-documented flag 3203 // to indicate, that some special sort of signal 3204 // trampoline is used. 3205 // We will never set this flag, and we should 3206 // ignore this flag in our diagnostic 3207 #ifdef SIGNIFICANT_SIGNAL_MASK 3208 #undef SIGNIFICANT_SIGNAL_MASK 3209 #endif 3210 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3211 3212 static const char* get_signal_handler_name(address handler, 3213 char* buf, int buflen) { 3214 int offset; 3215 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3216 if (found) { 3217 // skip directory names 3218 const char *p1, *p2; 3219 p1 = buf; 3220 size_t len = strlen(os::file_separator()); 3221 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3222 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3223 } else { 3224 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3225 } 3226 return buf; 3227 } 3228 3229 static void print_signal_handler(outputStream* st, int sig, 3230 char* buf, size_t buflen) { 3231 struct sigaction sa; 3232 3233 sigaction(sig, NULL, &sa); 3234 3235 // See comment for SIGNIFICANT_SIGNAL_MASK define 3236 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3237 3238 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3239 3240 address handler = (sa.sa_flags & SA_SIGINFO) 3241 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3242 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3243 3244 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3245 st->print("SIG_DFL"); 3246 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3247 st->print("SIG_IGN"); 3248 } else { 3249 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3250 } 3251 3252 st->print(", sa_mask[0]="); 3253 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3254 3255 address rh = VMError::get_resetted_sighandler(sig); 3256 // May be, handler was resetted by VMError? 3257 if (rh != NULL) { 3258 handler = rh; 3259 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3260 } 3261 3262 st->print(", sa_flags="); 3263 os::Posix::print_sa_flags(st, sa.sa_flags); 3264 3265 // Check: is it our handler? 3266 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3267 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3268 // It is our signal handler 3269 // check for flags, reset system-used one! 3270 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3271 st->print( 3272 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3273 os::Bsd::get_our_sigflags(sig)); 3274 } 3275 } 3276 st->cr(); 3277 } 3278 3279 3280 #define DO_SIGNAL_CHECK(sig) \ 3281 do { \ 3282 if (!sigismember(&check_signal_done, sig)) { \ 3283 os::Bsd::check_signal_handler(sig); \ 3284 } \ 3285 } while (0) 3286 3287 // This method is a periodic task to check for misbehaving JNI applications 3288 // under CheckJNI, we can add any periodic checks here 3289 3290 void os::run_periodic_checks() { 3291 3292 if (check_signals == false) return; 3293 3294 // SEGV and BUS if overridden could potentially prevent 3295 // generation of hs*.log in the event of a crash, debugging 3296 // such a case can be very challenging, so we absolutely 3297 // check the following for a good measure: 3298 DO_SIGNAL_CHECK(SIGSEGV); 3299 DO_SIGNAL_CHECK(SIGILL); 3300 DO_SIGNAL_CHECK(SIGFPE); 3301 DO_SIGNAL_CHECK(SIGBUS); 3302 DO_SIGNAL_CHECK(SIGPIPE); 3303 DO_SIGNAL_CHECK(SIGXFSZ); 3304 3305 3306 // ReduceSignalUsage allows the user to override these handlers 3307 // see comments at the very top and jvm_solaris.h 3308 if (!ReduceSignalUsage) { 3309 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3310 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3311 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3312 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3313 } 3314 3315 DO_SIGNAL_CHECK(SR_signum); 3316 } 3317 3318 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3319 3320 static os_sigaction_t os_sigaction = NULL; 3321 3322 void os::Bsd::check_signal_handler(int sig) { 3323 char buf[O_BUFLEN]; 3324 address jvmHandler = NULL; 3325 3326 3327 struct sigaction act; 3328 if (os_sigaction == NULL) { 3329 // only trust the default sigaction, in case it has been interposed 3330 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3331 if (os_sigaction == NULL) return; 3332 } 3333 3334 os_sigaction(sig, (struct sigaction*)NULL, &act); 3335 3336 3337 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3338 3339 address thisHandler = (act.sa_flags & SA_SIGINFO) 3340 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3341 : CAST_FROM_FN_PTR(address, act.sa_handler); 3342 3343 3344 switch (sig) { 3345 case SIGSEGV: 3346 case SIGBUS: 3347 case SIGFPE: 3348 case SIGPIPE: 3349 case SIGILL: 3350 case SIGXFSZ: 3351 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3352 break; 3353 3354 case SHUTDOWN1_SIGNAL: 3355 case SHUTDOWN2_SIGNAL: 3356 case SHUTDOWN3_SIGNAL: 3357 case BREAK_SIGNAL: 3358 jvmHandler = (address)user_handler(); 3359 break; 3360 3361 default: 3362 if (sig == SR_signum) { 3363 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3364 } else { 3365 return; 3366 } 3367 break; 3368 } 3369 3370 if (thisHandler != jvmHandler) { 3371 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3372 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3373 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3374 // No need to check this sig any longer 3375 sigaddset(&check_signal_done, sig); 3376 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3377 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3378 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3379 exception_name(sig, buf, O_BUFLEN)); 3380 } 3381 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3382 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3383 tty->print("expected:"); 3384 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); 3385 tty->cr(); 3386 tty->print(" found:"); 3387 os::Posix::print_sa_flags(tty, act.sa_flags); 3388 tty->cr(); 3389 // No need to check this sig any longer 3390 sigaddset(&check_signal_done, sig); 3391 } 3392 3393 // Dump all the signal 3394 if (sigismember(&check_signal_done, sig)) { 3395 print_signal_handlers(tty, buf, O_BUFLEN); 3396 } 3397 } 3398 3399 extern void report_error(char* file_name, int line_no, char* title, 3400 char* format, ...); 3401 3402 // this is called _before_ the most of global arguments have been parsed 3403 void os::init(void) { 3404 char dummy; // used to get a guess on initial stack address 3405 // first_hrtime = gethrtime(); 3406 3407 // With BsdThreads the JavaMain thread pid (primordial thread) 3408 // is different than the pid of the java launcher thread. 3409 // So, on Bsd, the launcher thread pid is passed to the VM 3410 // via the sun.java.launcher.pid property. 3411 // Use this property instead of getpid() if it was correctly passed. 3412 // See bug 6351349. 3413 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3414 3415 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3416 3417 clock_tics_per_sec = CLK_TCK; 3418 3419 init_random(1234567); 3420 3421 ThreadCritical::initialize(); 3422 3423 Bsd::set_page_size(getpagesize()); 3424 if (Bsd::page_size() == -1) { 3425 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3426 } 3427 init_page_sizes((size_t) Bsd::page_size()); 3428 3429 Bsd::initialize_system_info(); 3430 3431 // main_thread points to the aboriginal thread 3432 Bsd::_main_thread = pthread_self(); 3433 3434 Bsd::clock_init(); 3435 initial_time_count = javaTimeNanos(); 3436 3437 #ifdef __APPLE__ 3438 // XXXDARWIN 3439 // Work around the unaligned VM callbacks in hotspot's 3440 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3441 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3442 // alignment when doing symbol lookup. To work around this, we force early 3443 // binding of all symbols now, thus binding when alignment is known-good. 3444 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3445 #endif 3446 } 3447 3448 // To install functions for atexit system call 3449 extern "C" { 3450 static void perfMemory_exit_helper() { 3451 perfMemory_exit(); 3452 } 3453 } 3454 3455 // this is called _after_ the global arguments have been parsed 3456 jint os::init_2(void) { 3457 // Allocate a single page and mark it as readable for safepoint polling 3458 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3459 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page"); 3460 3461 os::set_polling_page(polling_page); 3462 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 3463 3464 if (!UseMembar) { 3465 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3466 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3467 os::set_memory_serialize_page(mem_serialize_page); 3468 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 3469 } 3470 3471 // initialize suspend/resume support - must do this before signal_sets_init() 3472 if (SR_initialize() != 0) { 3473 perror("SR_initialize failed"); 3474 return JNI_ERR; 3475 } 3476 3477 Bsd::signal_sets_init(); 3478 Bsd::install_signal_handlers(); 3479 3480 // Check minimum allowable stack size for thread creation and to initialize 3481 // the java system classes, including StackOverflowError - depends on page 3482 // size. Add a page for compiler2 recursion in main thread. 3483 // Add in 2*BytesPerWord times page size to account for VM stack during 3484 // class initialization depending on 32 or 64 bit VM. 3485 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3486 JavaThread::stack_guard_zone_size() + 3487 JavaThread::stack_shadow_zone_size() + 3488 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3489 3490 size_t threadStackSizeInBytes = ThreadStackSize * K; 3491 if (threadStackSizeInBytes != 0 && 3492 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3493 tty->print_cr("\nThe stack size specified is too small, " 3494 "Specify at least %dk", 3495 os::Bsd::min_stack_allowed/ K); 3496 return JNI_ERR; 3497 } 3498 3499 // Make the stack size a multiple of the page size so that 3500 // the yellow/red zones can be guarded. 3501 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3502 vm_page_size())); 3503 3504 if (MaxFDLimit) { 3505 // set the number of file descriptors to max. print out error 3506 // if getrlimit/setrlimit fails but continue regardless. 3507 struct rlimit nbr_files; 3508 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3509 if (status != 0) { 3510 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3511 } else { 3512 nbr_files.rlim_cur = nbr_files.rlim_max; 3513 3514 #ifdef __APPLE__ 3515 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3516 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3517 // be used instead 3518 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3519 #endif 3520 3521 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3522 if (status != 0) { 3523 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3524 } 3525 } 3526 } 3527 3528 // at-exit methods are called in the reverse order of their registration. 3529 // atexit functions are called on return from main or as a result of a 3530 // call to exit(3C). There can be only 32 of these functions registered 3531 // and atexit() does not set errno. 3532 3533 if (PerfAllowAtExitRegistration) { 3534 // only register atexit functions if PerfAllowAtExitRegistration is set. 3535 // atexit functions can be delayed until process exit time, which 3536 // can be problematic for embedded VM situations. Embedded VMs should 3537 // call DestroyJavaVM() to assure that VM resources are released. 3538 3539 // note: perfMemory_exit_helper atexit function may be removed in 3540 // the future if the appropriate cleanup code can be added to the 3541 // VM_Exit VMOperation's doit method. 3542 if (atexit(perfMemory_exit_helper) != 0) { 3543 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3544 } 3545 } 3546 3547 // initialize thread priority policy 3548 prio_init(); 3549 3550 #ifdef __APPLE__ 3551 // dynamically link to objective c gc registration 3552 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3553 if (handleLibObjc != NULL) { 3554 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3555 } 3556 #endif 3557 3558 return JNI_OK; 3559 } 3560 3561 // Mark the polling page as unreadable 3562 void os::make_polling_page_unreadable(void) { 3563 if (!guard_memory((char*)_polling_page, Bsd::page_size())) { 3564 fatal("Could not disable polling page"); 3565 } 3566 } 3567 3568 // Mark the polling page as readable 3569 void os::make_polling_page_readable(void) { 3570 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3571 fatal("Could not enable polling page"); 3572 } 3573 } 3574 3575 int os::active_processor_count() { 3576 return _processor_count; 3577 } 3578 3579 void os::set_native_thread_name(const char *name) { 3580 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3581 // This is only supported in Snow Leopard and beyond 3582 if (name != NULL) { 3583 // Add a "Java: " prefix to the name 3584 char buf[MAXTHREADNAMESIZE]; 3585 snprintf(buf, sizeof(buf), "Java: %s", name); 3586 pthread_setname_np(buf); 3587 } 3588 #endif 3589 } 3590 3591 bool os::distribute_processes(uint length, uint* distribution) { 3592 // Not yet implemented. 3593 return false; 3594 } 3595 3596 bool os::bind_to_processor(uint processor_id) { 3597 // Not yet implemented. 3598 return false; 3599 } 3600 3601 void os::SuspendedThreadTask::internal_do_task() { 3602 if (do_suspend(_thread->osthread())) { 3603 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3604 do_task(context); 3605 do_resume(_thread->osthread()); 3606 } 3607 } 3608 3609 /// 3610 class PcFetcher : public os::SuspendedThreadTask { 3611 public: 3612 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3613 ExtendedPC result(); 3614 protected: 3615 void do_task(const os::SuspendedThreadTaskContext& context); 3616 private: 3617 ExtendedPC _epc; 3618 }; 3619 3620 ExtendedPC PcFetcher::result() { 3621 guarantee(is_done(), "task is not done yet."); 3622 return _epc; 3623 } 3624 3625 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3626 Thread* thread = context.thread(); 3627 OSThread* osthread = thread->osthread(); 3628 if (osthread->ucontext() != NULL) { 3629 _epc = os::Bsd::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3630 } else { 3631 // NULL context is unexpected, double-check this is the VMThread 3632 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3633 } 3634 } 3635 3636 // Suspends the target using the signal mechanism and then grabs the PC before 3637 // resuming the target. Used by the flat-profiler only 3638 ExtendedPC os::get_thread_pc(Thread* thread) { 3639 // Make sure that it is called by the watcher for the VMThread 3640 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3641 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3642 3643 PcFetcher fetcher(thread); 3644 fetcher.run(); 3645 return fetcher.result(); 3646 } 3647 3648 //////////////////////////////////////////////////////////////////////////////// 3649 // debug support 3650 3651 bool os::find(address addr, outputStream* st) { 3652 Dl_info dlinfo; 3653 memset(&dlinfo, 0, sizeof(dlinfo)); 3654 if (dladdr(addr, &dlinfo) != 0) { 3655 st->print(PTR_FORMAT ": ", addr); 3656 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3657 st->print("%s+%#x", dlinfo.dli_sname, 3658 addr - (intptr_t)dlinfo.dli_saddr); 3659 } else if (dlinfo.dli_fbase != NULL) { 3660 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3661 } else { 3662 st->print("<absolute address>"); 3663 } 3664 if (dlinfo.dli_fname != NULL) { 3665 st->print(" in %s", dlinfo.dli_fname); 3666 } 3667 if (dlinfo.dli_fbase != NULL) { 3668 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3669 } 3670 st->cr(); 3671 3672 if (Verbose) { 3673 // decode some bytes around the PC 3674 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3675 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3676 address lowest = (address) dlinfo.dli_sname; 3677 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3678 if (begin < lowest) begin = lowest; 3679 Dl_info dlinfo2; 3680 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3681 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 3682 end = (address) dlinfo2.dli_saddr; 3683 } 3684 Disassembler::decode(begin, end, st); 3685 } 3686 return true; 3687 } 3688 return false; 3689 } 3690 3691 //////////////////////////////////////////////////////////////////////////////// 3692 // misc 3693 3694 // This does not do anything on Bsd. This is basically a hook for being 3695 // able to use structured exception handling (thread-local exception filters) 3696 // on, e.g., Win32. 3697 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3698 const methodHandle& method, JavaCallArguments* args, 3699 Thread* thread) { 3700 f(value, method, args, thread); 3701 } 3702 3703 void os::print_statistics() { 3704 } 3705 3706 bool os::message_box(const char* title, const char* message) { 3707 int i; 3708 fdStream err(defaultStream::error_fd()); 3709 for (i = 0; i < 78; i++) err.print_raw("="); 3710 err.cr(); 3711 err.print_raw_cr(title); 3712 for (i = 0; i < 78; i++) err.print_raw("-"); 3713 err.cr(); 3714 err.print_raw_cr(message); 3715 for (i = 0; i < 78; i++) err.print_raw("="); 3716 err.cr(); 3717 3718 char buf[16]; 3719 // Prevent process from exiting upon "read error" without consuming all CPU 3720 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3721 3722 return buf[0] == 'y' || buf[0] == 'Y'; 3723 } 3724 3725 int os::stat(const char *path, struct stat *sbuf) { 3726 char pathbuf[MAX_PATH]; 3727 if (strlen(path) > MAX_PATH - 1) { 3728 errno = ENAMETOOLONG; 3729 return -1; 3730 } 3731 os::native_path(strcpy(pathbuf, path)); 3732 return ::stat(pathbuf, sbuf); 3733 } 3734 3735 static inline struct timespec get_mtime(const char* filename) { 3736 struct stat st; 3737 int ret = os::stat(filename, &st); 3738 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 3739 #ifdef __APPLE__ 3740 return st.st_mtimespec; 3741 #else 3742 return st.st_mtim; 3743 #endif 3744 } 3745 3746 int os::compare_file_modified_times(const char* file1, const char* file2) { 3747 struct timespec filetime1 = get_mtime(file1); 3748 struct timespec filetime2 = get_mtime(file2); 3749 int diff = filetime1.tv_sec - filetime2.tv_sec; 3750 if (diff == 0) { 3751 return filetime1.tv_nsec - filetime2.tv_nsec; 3752 } 3753 return diff; 3754 } 3755 3756 3757 bool os::check_heap(bool force) { 3758 return true; 3759 } 3760 3761 // Is a (classpath) directory empty? 3762 bool os::dir_is_empty(const char* path) { 3763 DIR *dir = NULL; 3764 struct dirent *ptr; 3765 3766 dir = opendir(path); 3767 if (dir == NULL) return true; 3768 3769 // Scan the directory 3770 bool result = true; 3771 char buf[sizeof(struct dirent) + MAX_PATH]; 3772 while (result && (ptr = ::readdir(dir)) != NULL) { 3773 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3774 result = false; 3775 } 3776 } 3777 closedir(dir); 3778 return result; 3779 } 3780 3781 // This code originates from JDK's sysOpen and open64_w 3782 // from src/solaris/hpi/src/system_md.c 3783 3784 int os::open(const char *path, int oflag, int mode) { 3785 if (strlen(path) > MAX_PATH - 1) { 3786 errno = ENAMETOOLONG; 3787 return -1; 3788 } 3789 int fd; 3790 3791 fd = ::open(path, oflag, mode); 3792 if (fd == -1) return -1; 3793 3794 // If the open succeeded, the file might still be a directory 3795 { 3796 struct stat buf; 3797 int ret = ::fstat(fd, &buf); 3798 int st_mode = buf.st_mode; 3799 3800 if (ret != -1) { 3801 if ((st_mode & S_IFMT) == S_IFDIR) { 3802 errno = EISDIR; 3803 ::close(fd); 3804 return -1; 3805 } 3806 } else { 3807 ::close(fd); 3808 return -1; 3809 } 3810 } 3811 3812 // All file descriptors that are opened in the JVM and not 3813 // specifically destined for a subprocess should have the 3814 // close-on-exec flag set. If we don't set it, then careless 3rd 3815 // party native code might fork and exec without closing all 3816 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3817 // UNIXProcess.c), and this in turn might: 3818 // 3819 // - cause end-of-file to fail to be detected on some file 3820 // descriptors, resulting in mysterious hangs, or 3821 // 3822 // - might cause an fopen in the subprocess to fail on a system 3823 // suffering from bug 1085341. 3824 // 3825 // (Yes, the default setting of the close-on-exec flag is a Unix 3826 // design flaw) 3827 // 3828 // See: 3829 // 1085341: 32-bit stdio routines should support file descriptors >255 3830 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3831 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3832 // 3833 #ifdef FD_CLOEXEC 3834 { 3835 int flags = ::fcntl(fd, F_GETFD); 3836 if (flags != -1) { 3837 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3838 } 3839 } 3840 #endif 3841 3842 return fd; 3843 } 3844 3845 3846 // create binary file, rewriting existing file if required 3847 int os::create_binary_file(const char* path, bool rewrite_existing) { 3848 int oflags = O_WRONLY | O_CREAT; 3849 if (!rewrite_existing) { 3850 oflags |= O_EXCL; 3851 } 3852 return ::open(path, oflags, S_IREAD | S_IWRITE); 3853 } 3854 3855 // return current position of file pointer 3856 jlong os::current_file_offset(int fd) { 3857 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3858 } 3859 3860 // move file pointer to the specified offset 3861 jlong os::seek_to_file_offset(int fd, jlong offset) { 3862 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3863 } 3864 3865 // This code originates from JDK's sysAvailable 3866 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3867 3868 int os::available(int fd, jlong *bytes) { 3869 jlong cur, end; 3870 int mode; 3871 struct stat buf; 3872 3873 if (::fstat(fd, &buf) >= 0) { 3874 mode = buf.st_mode; 3875 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3876 int n; 3877 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3878 *bytes = n; 3879 return 1; 3880 } 3881 } 3882 } 3883 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3884 return 0; 3885 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3886 return 0; 3887 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3888 return 0; 3889 } 3890 *bytes = end - cur; 3891 return 1; 3892 } 3893 3894 // Map a block of memory. 3895 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3896 char *addr, size_t bytes, bool read_only, 3897 bool allow_exec) { 3898 int prot; 3899 int flags; 3900 3901 if (read_only) { 3902 prot = PROT_READ; 3903 flags = MAP_SHARED; 3904 } else { 3905 prot = PROT_READ | PROT_WRITE; 3906 flags = MAP_PRIVATE; 3907 } 3908 3909 if (allow_exec) { 3910 prot |= PROT_EXEC; 3911 } 3912 3913 if (addr != NULL) { 3914 flags |= MAP_FIXED; 3915 } 3916 3917 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 3918 fd, file_offset); 3919 if (mapped_address == MAP_FAILED) { 3920 return NULL; 3921 } 3922 return mapped_address; 3923 } 3924 3925 3926 // Remap a block of memory. 3927 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3928 char *addr, size_t bytes, bool read_only, 3929 bool allow_exec) { 3930 // same as map_memory() on this OS 3931 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3932 allow_exec); 3933 } 3934 3935 3936 // Unmap a block of memory. 3937 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3938 return munmap(addr, bytes) == 0; 3939 } 3940 3941 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3942 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3943 // of a thread. 3944 // 3945 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3946 // the fast estimate available on the platform. 3947 3948 jlong os::current_thread_cpu_time() { 3949 #ifdef __APPLE__ 3950 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 3951 #else 3952 Unimplemented(); 3953 return 0; 3954 #endif 3955 } 3956 3957 jlong os::thread_cpu_time(Thread* thread) { 3958 #ifdef __APPLE__ 3959 return os::thread_cpu_time(thread, true /* user + sys */); 3960 #else 3961 Unimplemented(); 3962 return 0; 3963 #endif 3964 } 3965 3966 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3967 #ifdef __APPLE__ 3968 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3969 #else 3970 Unimplemented(); 3971 return 0; 3972 #endif 3973 } 3974 3975 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3976 #ifdef __APPLE__ 3977 struct thread_basic_info tinfo; 3978 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 3979 kern_return_t kr; 3980 thread_t mach_thread; 3981 3982 mach_thread = thread->osthread()->thread_id(); 3983 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 3984 if (kr != KERN_SUCCESS) { 3985 return -1; 3986 } 3987 3988 if (user_sys_cpu_time) { 3989 jlong nanos; 3990 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 3991 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 3992 return nanos; 3993 } else { 3994 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 3995 } 3996 #else 3997 Unimplemented(); 3998 return 0; 3999 #endif 4000 } 4001 4002 4003 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4004 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4005 info_ptr->may_skip_backward = false; // elapsed time not wall time 4006 info_ptr->may_skip_forward = false; // elapsed time not wall time 4007 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4008 } 4009 4010 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4011 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4012 info_ptr->may_skip_backward = false; // elapsed time not wall time 4013 info_ptr->may_skip_forward = false; // elapsed time not wall time 4014 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4015 } 4016 4017 bool os::is_thread_cpu_time_supported() { 4018 #ifdef __APPLE__ 4019 return true; 4020 #else 4021 return false; 4022 #endif 4023 } 4024 4025 // System loadavg support. Returns -1 if load average cannot be obtained. 4026 // Bsd doesn't yet have a (official) notion of processor sets, 4027 // so just return the system wide load average. 4028 int os::loadavg(double loadavg[], int nelem) { 4029 return ::getloadavg(loadavg, nelem); 4030 } 4031 4032 void os::pause() { 4033 char filename[MAX_PATH]; 4034 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4035 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4036 } else { 4037 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4038 } 4039 4040 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4041 if (fd != -1) { 4042 struct stat buf; 4043 ::close(fd); 4044 while (::stat(filename, &buf) == 0) { 4045 (void)::poll(NULL, 0, 100); 4046 } 4047 } else { 4048 jio_fprintf(stderr, 4049 "Could not open pause file '%s', continuing immediately.\n", filename); 4050 } 4051 } 4052 4053 4054 // Refer to the comments in os_solaris.cpp park-unpark. The next two 4055 // comment paragraphs are worth repeating here: 4056 // 4057 // Assumption: 4058 // Only one parker can exist on an event, which is why we allocate 4059 // them per-thread. Multiple unparkers can coexist. 4060 // 4061 // _Event serves as a restricted-range semaphore. 4062 // -1 : thread is blocked, i.e. there is a waiter 4063 // 0 : neutral: thread is running or ready, 4064 // could have been signaled after a wait started 4065 // 1 : signaled - thread is running or ready 4066 // 4067 4068 // utility to compute the abstime argument to timedwait: 4069 // millis is the relative timeout time 4070 // abstime will be the absolute timeout time 4071 // TODO: replace compute_abstime() with unpackTime() 4072 4073 static struct timespec* compute_abstime(struct timespec* abstime, 4074 jlong millis) { 4075 if (millis < 0) millis = 0; 4076 struct timeval now; 4077 int status = gettimeofday(&now, NULL); 4078 assert(status == 0, "gettimeofday"); 4079 jlong seconds = millis / 1000; 4080 millis %= 1000; 4081 if (seconds > 50000000) { // see man cond_timedwait(3T) 4082 seconds = 50000000; 4083 } 4084 abstime->tv_sec = now.tv_sec + seconds; 4085 long usec = now.tv_usec + millis * 1000; 4086 if (usec >= 1000000) { 4087 abstime->tv_sec += 1; 4088 usec -= 1000000; 4089 } 4090 abstime->tv_nsec = usec * 1000; 4091 return abstime; 4092 } 4093 4094 void os::PlatformEvent::park() { // AKA "down()" 4095 // Transitions for _Event: 4096 // -1 => -1 : illegal 4097 // 1 => 0 : pass - return immediately 4098 // 0 => -1 : block; then set _Event to 0 before returning 4099 4100 // Invariant: Only the thread associated with the Event/PlatformEvent 4101 // may call park(). 4102 // TODO: assert that _Assoc != NULL or _Assoc == Self 4103 assert(_nParked == 0, "invariant"); 4104 4105 int v; 4106 for (;;) { 4107 v = _Event; 4108 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4109 } 4110 guarantee(v >= 0, "invariant"); 4111 if (v == 0) { 4112 // Do this the hard way by blocking ... 4113 int status = pthread_mutex_lock(_mutex); 4114 assert_status(status == 0, status, "mutex_lock"); 4115 guarantee(_nParked == 0, "invariant"); 4116 ++_nParked; 4117 while (_Event < 0) { 4118 status = pthread_cond_wait(_cond, _mutex); 4119 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4120 // Treat this the same as if the wait was interrupted 4121 if (status == ETIMEDOUT) { status = EINTR; } 4122 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4123 } 4124 --_nParked; 4125 4126 _Event = 0; 4127 status = pthread_mutex_unlock(_mutex); 4128 assert_status(status == 0, status, "mutex_unlock"); 4129 // Paranoia to ensure our locked and lock-free paths interact 4130 // correctly with each other. 4131 OrderAccess::fence(); 4132 } 4133 guarantee(_Event >= 0, "invariant"); 4134 } 4135 4136 int os::PlatformEvent::park(jlong millis) { 4137 // Transitions for _Event: 4138 // -1 => -1 : illegal 4139 // 1 => 0 : pass - return immediately 4140 // 0 => -1 : block; then set _Event to 0 before returning 4141 4142 guarantee(_nParked == 0, "invariant"); 4143 4144 int v; 4145 for (;;) { 4146 v = _Event; 4147 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4148 } 4149 guarantee(v >= 0, "invariant"); 4150 if (v != 0) return OS_OK; 4151 4152 // We do this the hard way, by blocking the thread. 4153 // Consider enforcing a minimum timeout value. 4154 struct timespec abst; 4155 compute_abstime(&abst, millis); 4156 4157 int ret = OS_TIMEOUT; 4158 int status = pthread_mutex_lock(_mutex); 4159 assert_status(status == 0, status, "mutex_lock"); 4160 guarantee(_nParked == 0, "invariant"); 4161 ++_nParked; 4162 4163 // Object.wait(timo) will return because of 4164 // (a) notification 4165 // (b) timeout 4166 // (c) thread.interrupt 4167 // 4168 // Thread.interrupt and object.notify{All} both call Event::set. 4169 // That is, we treat thread.interrupt as a special case of notification. 4170 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false. 4171 // We assume all ETIME returns are valid. 4172 // 4173 // TODO: properly differentiate simultaneous notify+interrupt. 4174 // In that case, we should propagate the notify to another waiter. 4175 4176 while (_Event < 0) { 4177 status = pthread_cond_timedwait(_cond, _mutex, &abst); 4178 assert_status(status == 0 || status == EINTR || 4179 status == ETIMEDOUT, 4180 status, "cond_timedwait"); 4181 if (!FilterSpuriousWakeups) break; // previous semantics 4182 if (status == ETIMEDOUT) break; 4183 // We consume and ignore EINTR and spurious wakeups. 4184 } 4185 --_nParked; 4186 if (_Event >= 0) { 4187 ret = OS_OK; 4188 } 4189 _Event = 0; 4190 status = pthread_mutex_unlock(_mutex); 4191 assert_status(status == 0, status, "mutex_unlock"); 4192 assert(_nParked == 0, "invariant"); 4193 // Paranoia to ensure our locked and lock-free paths interact 4194 // correctly with each other. 4195 OrderAccess::fence(); 4196 return ret; 4197 } 4198 4199 void os::PlatformEvent::unpark() { 4200 // Transitions for _Event: 4201 // 0 => 1 : just return 4202 // 1 => 1 : just return 4203 // -1 => either 0 or 1; must signal target thread 4204 // That is, we can safely transition _Event from -1 to either 4205 // 0 or 1. 4206 // See also: "Semaphores in Plan 9" by Mullender & Cox 4207 // 4208 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4209 // that it will take two back-to-back park() calls for the owning 4210 // thread to block. This has the benefit of forcing a spurious return 4211 // from the first park() call after an unpark() call which will help 4212 // shake out uses of park() and unpark() without condition variables. 4213 4214 if (Atomic::xchg(1, &_Event) >= 0) return; 4215 4216 // Wait for the thread associated with the event to vacate 4217 int status = pthread_mutex_lock(_mutex); 4218 assert_status(status == 0, status, "mutex_lock"); 4219 int AnyWaiters = _nParked; 4220 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4221 status = pthread_mutex_unlock(_mutex); 4222 assert_status(status == 0, status, "mutex_unlock"); 4223 if (AnyWaiters != 0) { 4224 // Note that we signal() *after* dropping the lock for "immortal" Events. 4225 // This is safe and avoids a common class of futile wakeups. In rare 4226 // circumstances this can cause a thread to return prematurely from 4227 // cond_{timed}wait() but the spurious wakeup is benign and the victim 4228 // will simply re-test the condition and re-park itself. 4229 // This provides particular benefit if the underlying platform does not 4230 // provide wait morphing. 4231 status = pthread_cond_signal(_cond); 4232 assert_status(status == 0, status, "cond_signal"); 4233 } 4234 } 4235 4236 4237 // JSR166 4238 // ------------------------------------------------------- 4239 4240 // The solaris and bsd implementations of park/unpark are fairly 4241 // conservative for now, but can be improved. They currently use a 4242 // mutex/condvar pair, plus a a count. 4243 // Park decrements count if > 0, else does a condvar wait. Unpark 4244 // sets count to 1 and signals condvar. Only one thread ever waits 4245 // on the condvar. Contention seen when trying to park implies that someone 4246 // is unparking you, so don't wait. And spurious returns are fine, so there 4247 // is no need to track notifications. 4248 4249 #define MAX_SECS 100000000 4250 4251 // This code is common to bsd and solaris and will be moved to a 4252 // common place in dolphin. 4253 // 4254 // The passed in time value is either a relative time in nanoseconds 4255 // or an absolute time in milliseconds. Either way it has to be unpacked 4256 // into suitable seconds and nanoseconds components and stored in the 4257 // given timespec structure. 4258 // Given time is a 64-bit value and the time_t used in the timespec is only 4259 // a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4260 // overflow if times way in the future are given. Further on Solaris versions 4261 // prior to 10 there is a restriction (see cond_timedwait) that the specified 4262 // number of seconds, in abstime, is less than current_time + 100,000,000. 4263 // As it will be 28 years before "now + 100000000" will overflow we can 4264 // ignore overflow and just impose a hard-limit on seconds using the value 4265 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 4266 // years from "now". 4267 4268 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4269 assert(time > 0, "convertTime"); 4270 4271 struct timeval now; 4272 int status = gettimeofday(&now, NULL); 4273 assert(status == 0, "gettimeofday"); 4274 4275 time_t max_secs = now.tv_sec + MAX_SECS; 4276 4277 if (isAbsolute) { 4278 jlong secs = time / 1000; 4279 if (secs > max_secs) { 4280 absTime->tv_sec = max_secs; 4281 } else { 4282 absTime->tv_sec = secs; 4283 } 4284 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4285 } else { 4286 jlong secs = time / NANOSECS_PER_SEC; 4287 if (secs >= MAX_SECS) { 4288 absTime->tv_sec = max_secs; 4289 absTime->tv_nsec = 0; 4290 } else { 4291 absTime->tv_sec = now.tv_sec + secs; 4292 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4293 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4294 absTime->tv_nsec -= NANOSECS_PER_SEC; 4295 ++absTime->tv_sec; // note: this must be <= max_secs 4296 } 4297 } 4298 } 4299 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4300 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4301 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4302 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4303 } 4304 4305 void Parker::park(bool isAbsolute, jlong time) { 4306 // Ideally we'd do something useful while spinning, such 4307 // as calling unpackTime(). 4308 4309 // Optional fast-path check: 4310 // Return immediately if a permit is available. 4311 // We depend on Atomic::xchg() having full barrier semantics 4312 // since we are doing a lock-free update to _counter. 4313 if (Atomic::xchg(0, &_counter) > 0) return; 4314 4315 Thread* thread = Thread::current(); 4316 assert(thread->is_Java_thread(), "Must be JavaThread"); 4317 JavaThread *jt = (JavaThread *)thread; 4318 4319 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4320 // Check interrupt before trying to wait 4321 if (Thread::is_interrupted(thread, false)) { 4322 return; 4323 } 4324 4325 // Next, demultiplex/decode time arguments 4326 struct timespec absTime; 4327 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 4328 return; 4329 } 4330 if (time > 0) { 4331 unpackTime(&absTime, isAbsolute, time); 4332 } 4333 4334 4335 // Enter safepoint region 4336 // Beware of deadlocks such as 6317397. 4337 // The per-thread Parker:: mutex is a classic leaf-lock. 4338 // In particular a thread must never block on the Threads_lock while 4339 // holding the Parker:: mutex. If safepoints are pending both the 4340 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4341 ThreadBlockInVM tbivm(jt); 4342 4343 // Don't wait if cannot get lock since interference arises from 4344 // unblocking. Also. check interrupt before trying wait 4345 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4346 return; 4347 } 4348 4349 int status; 4350 if (_counter > 0) { // no wait needed 4351 _counter = 0; 4352 status = pthread_mutex_unlock(_mutex); 4353 assert_status(status == 0, status, "invariant"); 4354 // Paranoia to ensure our locked and lock-free paths interact 4355 // correctly with each other and Java-level accesses. 4356 OrderAccess::fence(); 4357 return; 4358 } 4359 4360 #ifdef ASSERT 4361 // Don't catch signals while blocked; let the running threads have the signals. 4362 // (This allows a debugger to break into the running thread.) 4363 sigset_t oldsigs; 4364 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4365 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4366 #endif 4367 4368 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4369 jt->set_suspend_equivalent(); 4370 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4371 4372 if (time == 0) { 4373 status = pthread_cond_wait(_cond, _mutex); 4374 } else { 4375 status = pthread_cond_timedwait(_cond, _mutex, &absTime); 4376 } 4377 assert_status(status == 0 || status == EINTR || 4378 status == ETIMEDOUT, 4379 status, "cond_timedwait"); 4380 4381 #ifdef ASSERT 4382 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4383 #endif 4384 4385 _counter = 0; 4386 status = pthread_mutex_unlock(_mutex); 4387 assert_status(status == 0, status, "invariant"); 4388 // Paranoia to ensure our locked and lock-free paths interact 4389 // correctly with each other and Java-level accesses. 4390 OrderAccess::fence(); 4391 4392 // If externally suspended while waiting, re-suspend 4393 if (jt->handle_special_suspend_equivalent_condition()) { 4394 jt->java_suspend_self(); 4395 } 4396 } 4397 4398 void Parker::unpark() { 4399 int status = pthread_mutex_lock(_mutex); 4400 assert_status(status == 0, status, "invariant"); 4401 const int s = _counter; 4402 _counter = 1; 4403 status = pthread_mutex_unlock(_mutex); 4404 assert_status(status == 0, status, "invariant"); 4405 if (s < 1) { 4406 status = pthread_cond_signal(_cond); 4407 assert_status(status == 0, status, "invariant"); 4408 } 4409 } 4410 4411 4412 // Darwin has no "environ" in a dynamic library. 4413 #ifdef __APPLE__ 4414 #include <crt_externs.h> 4415 #define environ (*_NSGetEnviron()) 4416 #else 4417 extern char** environ; 4418 #endif 4419 4420 // Run the specified command in a separate process. Return its exit value, 4421 // or -1 on failure (e.g. can't fork a new process). 4422 // Unlike system(), this function can be called from signal handler. It 4423 // doesn't block SIGINT et al. 4424 int os::fork_and_exec(char* cmd) { 4425 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4426 4427 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4428 // pthread_atfork handlers and reset pthread library. All we need is a 4429 // separate process to execve. Make a direct syscall to fork process. 4430 // On IA64 there's no fork syscall, we have to use fork() and hope for 4431 // the best... 4432 pid_t pid = fork(); 4433 4434 if (pid < 0) { 4435 // fork failed 4436 return -1; 4437 4438 } else if (pid == 0) { 4439 // child process 4440 4441 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4442 // first to kill every thread on the thread list. Because this list is 4443 // not reset by fork() (see notes above), execve() will instead kill 4444 // every thread in the parent process. We know this is the only thread 4445 // in the new process, so make a system call directly. 4446 // IA64 should use normal execve() from glibc to match the glibc fork() 4447 // above. 4448 execve("/bin/sh", (char* const*)argv, environ); 4449 4450 // execve failed 4451 _exit(-1); 4452 4453 } else { 4454 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4455 // care about the actual exit code, for now. 4456 4457 int status; 4458 4459 // Wait for the child process to exit. This returns immediately if 4460 // the child has already exited. */ 4461 while (waitpid(pid, &status, 0) < 0) { 4462 switch (errno) { 4463 case ECHILD: return 0; 4464 case EINTR: break; 4465 default: return -1; 4466 } 4467 } 4468 4469 if (WIFEXITED(status)) { 4470 // The child exited normally; get its exit code. 4471 return WEXITSTATUS(status); 4472 } else if (WIFSIGNALED(status)) { 4473 // The child exited because of a signal 4474 // The best value to return is 0x80 + signal number, 4475 // because that is what all Unix shells do, and because 4476 // it allows callers to distinguish between process exit and 4477 // process death by signal. 4478 return 0x80 + WTERMSIG(status); 4479 } else { 4480 // Unknown exit code; pass it through 4481 return status; 4482 } 4483 } 4484 } 4485 4486 // is_headless_jre() 4487 // 4488 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 4489 // in order to report if we are running in a headless jre 4490 // 4491 // Since JDK8 xawt/libmawt.so was moved into the same directory 4492 // as libawt.so, and renamed libawt_xawt.so 4493 // 4494 bool os::is_headless_jre() { 4495 #ifdef __APPLE__ 4496 // We no longer build headless-only on Mac OS X 4497 return false; 4498 #else 4499 struct stat statbuf; 4500 char buf[MAXPATHLEN]; 4501 char libmawtpath[MAXPATHLEN]; 4502 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4503 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4504 char *p; 4505 4506 // Get path to libjvm.so 4507 os::jvm_path(buf, sizeof(buf)); 4508 4509 // Get rid of libjvm.so 4510 p = strrchr(buf, '/'); 4511 if (p == NULL) { 4512 return false; 4513 } else { 4514 *p = '\0'; 4515 } 4516 4517 // Get rid of client or server 4518 p = strrchr(buf, '/'); 4519 if (p == NULL) { 4520 return false; 4521 } else { 4522 *p = '\0'; 4523 } 4524 4525 // check xawt/libmawt.so 4526 strcpy(libmawtpath, buf); 4527 strcat(libmawtpath, xawtstr); 4528 if (::stat(libmawtpath, &statbuf) == 0) return false; 4529 4530 // check libawt_xawt.so 4531 strcpy(libmawtpath, buf); 4532 strcat(libmawtpath, new_xawtstr); 4533 if (::stat(libmawtpath, &statbuf) == 0) return false; 4534 4535 return true; 4536 #endif 4537 } 4538 4539 // Get the default path to the core file 4540 // Returns the length of the string 4541 int os::get_core_path(char* buffer, size_t bufferSize) { 4542 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); 4543 4544 // Truncate if theoretical string was longer than bufferSize 4545 n = MIN2(n, (int)bufferSize); 4546 4547 return n; 4548 } 4549 4550 #ifndef PRODUCT 4551 void TestReserveMemorySpecial_test() { 4552 // No tests available for this platform 4553 } 4554 #endif 4555 4556 bool os::start_debugging(char *buf, int buflen) { 4557 int len = (int)strlen(buf); 4558 char *p = &buf[len]; 4559 4560 jio_snprintf(p, buflen-len, 4561 "\n\n" 4562 "Do you want to debug the problem?\n\n" 4563 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 4564 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 4565 "Otherwise, press RETURN to abort...", 4566 os::current_process_id(), os::current_process_id(), 4567 os::current_thread_id(), os::current_thread_id()); 4568 4569 bool yes = os::message_box("Unexpected Error", buf); 4570 4571 if (yes) { 4572 // yes, user asked VM to launch debugger 4573 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", 4574 os::current_process_id(), os::current_process_id()); 4575 4576 os::fork_and_exec(buf); 4577 yes = false; 4578 } 4579 return yes; 4580 } 4581 4582 bool os::map_memory_to_file(char* base, size_t size, const char* backingFileDir) { 4583 VMError::report_and_die("Allocating object heap with backing file is not supported for BSD"); 4584 return false; 4585 }