1 /* 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "interpreter/interpreter.hpp" 33 #include "jvm_bsd.h" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/filemap.hpp" 36 #include "mutex_bsd.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "os_share_bsd.hpp" 39 #include "prims/jniFastGetField.hpp" 40 #include "prims/jvm.h" 41 #include "prims/jvm_misc.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/extendedPC.hpp" 44 #include "runtime/globals.hpp" 45 #include "runtime/interfaceSupport.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/javaCalls.hpp" 48 #include "runtime/mutexLocker.hpp" 49 #include "runtime/objectMonitor.hpp" 50 #include "runtime/osThread.hpp" 51 #include "runtime/perfMemory.hpp" 52 #include "runtime/sharedRuntime.hpp" 53 #include "runtime/statSampler.hpp" 54 #include "runtime/stubRoutines.hpp" 55 #include "runtime/threadCritical.hpp" 56 #include "runtime/timer.hpp" 57 #include "services/attachListener.hpp" 58 #include "services/runtimeService.hpp" 59 #include "thread_bsd.inline.hpp" 60 #include "utilities/decoder.hpp" 61 #include "utilities/defaultStream.hpp" 62 #include "utilities/events.hpp" 63 #include "utilities/growableArray.hpp" 64 #include "utilities/vmError.hpp" 65 #ifdef TARGET_ARCH_x86 66 # include "assembler_x86.inline.hpp" 67 # include "nativeInst_x86.hpp" 68 #endif 69 #ifdef TARGET_ARCH_sparc 70 # include "assembler_sparc.inline.hpp" 71 # include "nativeInst_sparc.hpp" 72 #endif 73 #ifdef TARGET_ARCH_zero 74 # include "assembler_zero.inline.hpp" 75 # include "nativeInst_zero.hpp" 76 #endif 77 #ifdef TARGET_ARCH_arm 78 # include "assembler_arm.inline.hpp" 79 # include "nativeInst_arm.hpp" 80 #endif 81 #ifdef TARGET_ARCH_ppc 82 # include "assembler_ppc.inline.hpp" 83 # include "nativeInst_ppc.hpp" 84 #endif 85 #ifdef COMPILER1 86 #include "c1/c1_Runtime1.hpp" 87 #endif 88 #ifdef COMPILER2 89 #include "opto/runtime.hpp" 90 #endif 91 92 // put OS-includes here 93 # include <sys/types.h> 94 # include <sys/mman.h> 95 # include <sys/stat.h> 96 # include <sys/select.h> 97 # include <pthread.h> 98 # include <signal.h> 99 # include <errno.h> 100 # include <dlfcn.h> 101 # include <stdio.h> 102 # include <unistd.h> 103 # include <sys/resource.h> 104 # include <pthread.h> 105 # include <sys/stat.h> 106 # include <sys/time.h> 107 # include <sys/times.h> 108 # include <sys/utsname.h> 109 # include <sys/socket.h> 110 # include <sys/wait.h> 111 # include <time.h> 112 # include <pwd.h> 113 # include <poll.h> 114 # include <semaphore.h> 115 # include <fcntl.h> 116 # include <string.h> 117 #ifdef _ALLBSD_SOURCE 118 # include <sys/param.h> 119 # include <sys/sysctl.h> 120 #else 121 # include <syscall.h> 122 # include <sys/sysinfo.h> 123 # include <gnu/libc-version.h> 124 #endif 125 # include <sys/ipc.h> 126 # include <sys/shm.h> 127 #ifndef __APPLE__ 128 # include <link.h> 129 #endif 130 # include <stdint.h> 131 # include <inttypes.h> 132 # include <sys/ioctl.h> 133 134 #if defined(__FreeBSD__) || defined(__NetBSD__) 135 # include <elf.h> 136 #endif 137 138 #ifdef __APPLE__ 139 # include <mach/mach.h> // semaphore_* API 140 # include <mach-o/dyld.h> 141 # include <sys/proc_info.h> 142 # include <objc/objc-auto.h> 143 #endif 144 145 #ifndef MAP_ANONYMOUS 146 #define MAP_ANONYMOUS MAP_ANON 147 #endif 148 149 #define MAX_PATH (2 * K) 150 151 // for timer info max values which include all bits 152 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 153 #define SEC_IN_NANOSECS 1000000000LL 154 155 #define LARGEPAGES_BIT (1 << 6) 156 //////////////////////////////////////////////////////////////////////////////// 157 // global variables 158 julong os::Bsd::_physical_memory = 0; 159 160 #ifndef _ALLBSD_SOURCE 161 address os::Bsd::_initial_thread_stack_bottom = NULL; 162 uintptr_t os::Bsd::_initial_thread_stack_size = 0; 163 #endif 164 165 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 166 #ifndef _ALLBSD_SOURCE 167 int (*os::Bsd::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; 168 Mutex* os::Bsd::_createThread_lock = NULL; 169 #endif 170 pthread_t os::Bsd::_main_thread; 171 int os::Bsd::_page_size = -1; 172 #ifndef _ALLBSD_SOURCE 173 bool os::Bsd::_is_floating_stack = false; 174 bool os::Bsd::_is_NPTL = false; 175 bool os::Bsd::_supports_fast_thread_cpu_time = false; 176 const char * os::Bsd::_glibc_version = NULL; 177 const char * os::Bsd::_libpthread_version = NULL; 178 #endif 179 180 static jlong initial_time_count=0; 181 182 static int clock_tics_per_sec = 100; 183 184 // For diagnostics to print a message once. see run_periodic_checks 185 static sigset_t check_signal_done; 186 static bool check_signals = true;; 187 188 static pid_t _initial_pid = 0; 189 190 /* Signal number used to suspend/resume a thread */ 191 192 /* do not use any signal number less than SIGSEGV, see 4355769 */ 193 static int SR_signum = SIGUSR2; 194 sigset_t SR_sigset; 195 196 197 //////////////////////////////////////////////////////////////////////////////// 198 // utility functions 199 200 static int SR_initialize(); 201 static int SR_finalize(); 202 203 julong os::available_memory() { 204 return Bsd::available_memory(); 205 } 206 207 julong os::Bsd::available_memory() { 208 #ifdef _ALLBSD_SOURCE 209 // XXXBSD: this is just a stopgap implementation 210 return physical_memory() >> 2; 211 #else 212 // values in struct sysinfo are "unsigned long" 213 struct sysinfo si; 214 sysinfo(&si); 215 216 return (julong)si.freeram * si.mem_unit; 217 #endif 218 } 219 220 julong os::physical_memory() { 221 return Bsd::physical_memory(); 222 } 223 224 julong os::allocatable_physical_memory(julong size) { 225 #ifdef _LP64 226 return size; 227 #else 228 julong result = MIN2(size, (julong)3800*M); 229 if (!is_allocatable(result)) { 230 // See comments under solaris for alignment considerations 231 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); 232 result = MIN2(size, reasonable_size); 233 } 234 return result; 235 #endif // _LP64 236 } 237 238 //////////////////////////////////////////////////////////////////////////////// 239 // environment support 240 241 bool os::getenv(const char* name, char* buf, int len) { 242 const char* val = ::getenv(name); 243 if (val != NULL && strlen(val) < (size_t)len) { 244 strcpy(buf, val); 245 return true; 246 } 247 if (len > 0) buf[0] = 0; // return a null string 248 return false; 249 } 250 251 252 // Return true if user is running as root. 253 254 bool os::have_special_privileges() { 255 static bool init = false; 256 static bool privileges = false; 257 if (!init) { 258 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 259 init = true; 260 } 261 return privileges; 262 } 263 264 265 #ifndef _ALLBSD_SOURCE 266 #ifndef SYS_gettid 267 // i386: 224, ia64: 1105, amd64: 186, sparc 143 268 #ifdef __ia64__ 269 #define SYS_gettid 1105 270 #elif __i386__ 271 #define SYS_gettid 224 272 #elif __amd64__ 273 #define SYS_gettid 186 274 #elif __sparc__ 275 #define SYS_gettid 143 276 #else 277 #error define gettid for the arch 278 #endif 279 #endif 280 #endif 281 282 // Cpu architecture string 283 #if defined(ZERO) 284 static char cpu_arch[] = ZERO_LIBARCH; 285 #elif defined(IA64) 286 static char cpu_arch[] = "ia64"; 287 #elif defined(IA32) 288 static char cpu_arch[] = "i386"; 289 #elif defined(AMD64) 290 static char cpu_arch[] = "amd64"; 291 #elif defined(ARM) 292 static char cpu_arch[] = "arm"; 293 #elif defined(PPC) 294 static char cpu_arch[] = "ppc"; 295 #elif defined(SPARC) 296 # ifdef _LP64 297 static char cpu_arch[] = "sparcv9"; 298 # else 299 static char cpu_arch[] = "sparc"; 300 # endif 301 #else 302 #error Add appropriate cpu_arch setting 303 #endif 304 305 306 #ifndef _ALLBSD_SOURCE 307 // pid_t gettid() 308 // 309 // Returns the kernel thread id of the currently running thread. Kernel 310 // thread id is used to access /proc. 311 // 312 // (Note that getpid() on BsdThreads returns kernel thread id too; but 313 // on NPTL, it returns the same pid for all threads, as required by POSIX.) 314 // 315 pid_t os::Bsd::gettid() { 316 int rslt = syscall(SYS_gettid); 317 if (rslt == -1) { 318 // old kernel, no NPTL support 319 return getpid(); 320 } else { 321 return (pid_t)rslt; 322 } 323 } 324 325 // Most versions of bsd have a bug where the number of processors are 326 // determined by looking at the /proc file system. In a chroot environment, 327 // the system call returns 1. This causes the VM to act as if it is 328 // a single processor and elide locking (see is_MP() call). 329 static bool unsafe_chroot_detected = false; 330 static const char *unstable_chroot_error = "/proc file system not found.\n" 331 "Java may be unstable running multithreaded in a chroot " 332 "environment on Bsd when /proc filesystem is not mounted."; 333 #endif 334 335 #ifdef _ALLBSD_SOURCE 336 void os::Bsd::initialize_system_info() { 337 int mib[2]; 338 size_t len; 339 int cpu_val; 340 u_long mem_val; 341 342 /* get processors count via hw.ncpus sysctl */ 343 mib[0] = CTL_HW; 344 mib[1] = HW_NCPU; 345 len = sizeof(cpu_val); 346 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 347 set_processor_count(cpu_val); 348 } 349 else { 350 set_processor_count(1); // fallback 351 } 352 353 /* get physical memory via hw.usermem sysctl (hw.usermem is used 354 * instead of hw.physmem because we need size of allocatable memory 355 */ 356 mib[0] = CTL_HW; 357 mib[1] = HW_USERMEM; 358 len = sizeof(mem_val); 359 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) 360 _physical_memory = mem_val; 361 else 362 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 363 364 #ifdef __OpenBSD__ 365 { 366 // limit _physical_memory memory view on OpenBSD since 367 // datasize rlimit restricts us anyway. 368 struct rlimit limits; 369 getrlimit(RLIMIT_DATA, &limits); 370 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 371 } 372 #endif 373 } 374 #else 375 void os::Bsd::initialize_system_info() { 376 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 377 if (processor_count() == 1) { 378 pid_t pid = os::Bsd::gettid(); 379 char fname[32]; 380 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); 381 FILE *fp = fopen(fname, "r"); 382 if (fp == NULL) { 383 unsafe_chroot_detected = true; 384 } else { 385 fclose(fp); 386 } 387 } 388 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 389 assert(processor_count() > 0, "bsd error"); 390 } 391 #endif 392 393 #ifdef __APPLE__ 394 static const char *get_home() { 395 const char *home_dir = ::getenv("HOME"); 396 if ((home_dir == NULL) || (*home_dir == '\0')) { 397 struct passwd *passwd_info = getpwuid(geteuid()); 398 if (passwd_info != NULL) { 399 home_dir = passwd_info->pw_dir; 400 } 401 } 402 403 return home_dir; 404 } 405 #endif 406 407 void os::init_system_properties_values() { 408 // char arch[12]; 409 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 410 411 // The next steps are taken in the product version: 412 // 413 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. 414 // This library should be located at: 415 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. 416 // 417 // If "/jre/lib/" appears at the right place in the path, then we 418 // assume libjvm[_g].so is installed in a JDK and we use this path. 419 // 420 // Otherwise exit with message: "Could not create the Java virtual machine." 421 // 422 // The following extra steps are taken in the debugging version: 423 // 424 // If "/jre/lib/" does NOT appear at the right place in the path 425 // instead of exit check for $JAVA_HOME environment variable. 426 // 427 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 428 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so 429 // it looks like libjvm[_g].so is installed there 430 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. 431 // 432 // Otherwise exit. 433 // 434 // Important note: if the location of libjvm.so changes this 435 // code needs to be changed accordingly. 436 437 // The next few definitions allow the code to be verbatim: 438 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n)) 439 #define getenv(n) ::getenv(n) 440 441 /* 442 * See ld(1): 443 * The linker uses the following search paths to locate required 444 * shared libraries: 445 * 1: ... 446 * ... 447 * 7: The default directories, normally /lib and /usr/lib. 448 */ 449 #ifndef DEFAULT_LIBPATH 450 #define DEFAULT_LIBPATH "/lib:/usr/lib" 451 #endif 452 453 #define EXTENSIONS_DIR "/lib/ext" 454 #define ENDORSED_DIR "/lib/endorsed" 455 #define REG_DIR "/usr/java/packages" 456 457 #ifdef __APPLE__ 458 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 459 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 460 const char *user_home_dir = get_home(); 461 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 462 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 463 sizeof(SYS_EXTENSIONS_DIRS); 464 #endif 465 466 { 467 /* sysclasspath, java_home, dll_dir */ 468 { 469 char *home_path; 470 char *dll_path; 471 char *pslash; 472 char buf[MAXPATHLEN]; 473 os::jvm_path(buf, sizeof(buf)); 474 475 // Found the full path to libjvm.so. 476 // Now cut the path to <java_home>/jre if we can. 477 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 478 pslash = strrchr(buf, '/'); 479 if (pslash != NULL) 480 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 481 dll_path = malloc(strlen(buf) + 1); 482 if (dll_path == NULL) 483 return; 484 strcpy(dll_path, buf); 485 Arguments::set_dll_dir(dll_path); 486 487 if (pslash != NULL) { 488 pslash = strrchr(buf, '/'); 489 if (pslash != NULL) { 490 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 491 #ifndef __APPLE__ 492 pslash = strrchr(buf, '/'); 493 if (pslash != NULL) 494 *pslash = '\0'; /* get rid of /lib */ 495 #endif 496 } 497 } 498 499 home_path = malloc(strlen(buf) + 1); 500 if (home_path == NULL) 501 return; 502 strcpy(home_path, buf); 503 Arguments::set_java_home(home_path); 504 505 if (!set_boot_path('/', ':')) 506 return; 507 } 508 509 /* 510 * Where to look for native libraries 511 * 512 * Note: Due to a legacy implementation, most of the library path 513 * is set in the launcher. This was to accomodate linking restrictions 514 * on legacy Bsd implementations (which are no longer supported). 515 * Eventually, all the library path setting will be done here. 516 * 517 * However, to prevent the proliferation of improperly built native 518 * libraries, the new path component /usr/java/packages is added here. 519 * Eventually, all the library path setting will be done here. 520 */ 521 { 522 char *ld_library_path; 523 524 /* 525 * Construct the invariant part of ld_library_path. Note that the 526 * space for the colon and the trailing null are provided by the 527 * nulls included by the sizeof operator (so actually we allocate 528 * a byte more than necessary). 529 */ 530 #ifdef __APPLE__ 531 ld_library_path = (char *) malloc(system_ext_size); 532 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 533 #else 534 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 535 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 536 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 537 #endif 538 539 /* 540 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 541 * should always exist (until the legacy problem cited above is 542 * addressed). 543 */ 544 #ifdef __APPLE__ 545 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 546 char *l = getenv("JAVA_LIBRARY_PATH"); 547 if (l != NULL) { 548 char *t = ld_library_path; 549 /* That's +1 for the colon and +1 for the trailing '\0' */ 550 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 551 sprintf(ld_library_path, "%s:%s", l, t); 552 free(t); 553 } 554 555 char *v = getenv("DYLD_LIBRARY_PATH"); 556 #else 557 char *v = getenv("LD_LIBRARY_PATH"); 558 #endif 559 if (v != NULL) { 560 char *t = ld_library_path; 561 /* That's +1 for the colon and +1 for the trailing '\0' */ 562 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 563 sprintf(ld_library_path, "%s:%s", v, t); 564 free(t); 565 } 566 Arguments::set_library_path(ld_library_path); 567 } 568 569 /* 570 * Extensions directories. 571 * 572 * Note that the space for the colon and the trailing null are provided 573 * by the nulls included by the sizeof operator (so actually one byte more 574 * than necessary is allocated). 575 */ 576 { 577 #ifdef __APPLE__ 578 char *buf = malloc(strlen(Arguments::get_java_home()) + 579 sizeof(EXTENSIONS_DIR) + system_ext_size); 580 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 581 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 582 #else 583 char *buf = malloc(strlen(Arguments::get_java_home()) + 584 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 585 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 586 Arguments::get_java_home()); 587 #endif 588 589 Arguments::set_ext_dirs(buf); 590 } 591 592 /* Endorsed standards default directory. */ 593 { 594 char * buf; 595 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 596 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 597 Arguments::set_endorsed_dirs(buf); 598 } 599 } 600 601 #ifdef __APPLE__ 602 #undef SYS_EXTENSIONS_DIR 603 #endif 604 #undef malloc 605 #undef getenv 606 #undef EXTENSIONS_DIR 607 #undef ENDORSED_DIR 608 609 // Done 610 return; 611 } 612 613 //////////////////////////////////////////////////////////////////////////////// 614 // breakpoint support 615 616 void os::breakpoint() { 617 BREAKPOINT; 618 } 619 620 extern "C" void breakpoint() { 621 // use debugger to set breakpoint here 622 } 623 624 //////////////////////////////////////////////////////////////////////////////// 625 // signal support 626 627 debug_only(static bool signal_sets_initialized = false); 628 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 629 630 bool os::Bsd::is_sig_ignored(int sig) { 631 struct sigaction oact; 632 sigaction(sig, (struct sigaction*)NULL, &oact); 633 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 634 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 635 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 636 return true; 637 else 638 return false; 639 } 640 641 void os::Bsd::signal_sets_init() { 642 // Should also have an assertion stating we are still single-threaded. 643 assert(!signal_sets_initialized, "Already initialized"); 644 // Fill in signals that are necessarily unblocked for all threads in 645 // the VM. Currently, we unblock the following signals: 646 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 647 // by -Xrs (=ReduceSignalUsage)); 648 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 649 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 650 // the dispositions or masks wrt these signals. 651 // Programs embedding the VM that want to use the above signals for their 652 // own purposes must, at this time, use the "-Xrs" option to prevent 653 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 654 // (See bug 4345157, and other related bugs). 655 // In reality, though, unblocking these signals is really a nop, since 656 // these signals are not blocked by default. 657 sigemptyset(&unblocked_sigs); 658 sigemptyset(&allowdebug_blocked_sigs); 659 sigaddset(&unblocked_sigs, SIGILL); 660 sigaddset(&unblocked_sigs, SIGSEGV); 661 sigaddset(&unblocked_sigs, SIGBUS); 662 sigaddset(&unblocked_sigs, SIGFPE); 663 sigaddset(&unblocked_sigs, SR_signum); 664 665 if (!ReduceSignalUsage) { 666 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 667 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 668 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 669 } 670 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 671 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 672 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 673 } 674 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 675 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 676 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 677 } 678 } 679 // Fill in signals that are blocked by all but the VM thread. 680 sigemptyset(&vm_sigs); 681 if (!ReduceSignalUsage) 682 sigaddset(&vm_sigs, BREAK_SIGNAL); 683 debug_only(signal_sets_initialized = true); 684 685 } 686 687 // These are signals that are unblocked while a thread is running Java. 688 // (For some reason, they get blocked by default.) 689 sigset_t* os::Bsd::unblocked_signals() { 690 assert(signal_sets_initialized, "Not initialized"); 691 return &unblocked_sigs; 692 } 693 694 // These are the signals that are blocked while a (non-VM) thread is 695 // running Java. Only the VM thread handles these signals. 696 sigset_t* os::Bsd::vm_signals() { 697 assert(signal_sets_initialized, "Not initialized"); 698 return &vm_sigs; 699 } 700 701 // These are signals that are blocked during cond_wait to allow debugger in 702 sigset_t* os::Bsd::allowdebug_blocked_signals() { 703 assert(signal_sets_initialized, "Not initialized"); 704 return &allowdebug_blocked_sigs; 705 } 706 707 void os::Bsd::hotspot_sigmask(Thread* thread) { 708 709 //Save caller's signal mask before setting VM signal mask 710 sigset_t caller_sigmask; 711 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 712 713 OSThread* osthread = thread->osthread(); 714 osthread->set_caller_sigmask(caller_sigmask); 715 716 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 717 718 if (!ReduceSignalUsage) { 719 if (thread->is_VM_thread()) { 720 // Only the VM thread handles BREAK_SIGNAL ... 721 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 722 } else { 723 // ... all other threads block BREAK_SIGNAL 724 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 725 } 726 } 727 } 728 729 #ifndef _ALLBSD_SOURCE 730 ////////////////////////////////////////////////////////////////////////////// 731 // detecting pthread library 732 733 void os::Bsd::libpthread_init() { 734 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION 735 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a 736 // generic name for earlier versions. 737 // Define macros here so we can build HotSpot on old systems. 738 # ifndef _CS_GNU_LIBC_VERSION 739 # define _CS_GNU_LIBC_VERSION 2 740 # endif 741 # ifndef _CS_GNU_LIBPTHREAD_VERSION 742 # define _CS_GNU_LIBPTHREAD_VERSION 3 743 # endif 744 745 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); 746 if (n > 0) { 747 char *str = (char *)malloc(n); 748 confstr(_CS_GNU_LIBC_VERSION, str, n); 749 os::Bsd::set_glibc_version(str); 750 } else { 751 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() 752 static char _gnu_libc_version[32]; 753 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), 754 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); 755 os::Bsd::set_glibc_version(_gnu_libc_version); 756 } 757 758 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); 759 if (n > 0) { 760 char *str = (char *)malloc(n); 761 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); 762 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells 763 // us "NPTL-0.29" even we are running with BsdThreads. Check if this 764 // is the case. BsdThreads has a hard limit on max number of threads. 765 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. 766 // On the other hand, NPTL does not have such a limit, sysconf() 767 // will return -1 and errno is not changed. Check if it is really NPTL. 768 if (strcmp(os::Bsd::glibc_version(), "glibc 2.3.2") == 0 && 769 strstr(str, "NPTL") && 770 sysconf(_SC_THREAD_THREADS_MAX) > 0) { 771 free(str); 772 os::Bsd::set_libpthread_version("bsdthreads"); 773 } else { 774 os::Bsd::set_libpthread_version(str); 775 } 776 } else { 777 // glibc before 2.3.2 only has BsdThreads. 778 os::Bsd::set_libpthread_version("bsdthreads"); 779 } 780 781 if (strstr(libpthread_version(), "NPTL")) { 782 os::Bsd::set_is_NPTL(); 783 } else { 784 os::Bsd::set_is_BsdThreads(); 785 } 786 787 // BsdThreads have two flavors: floating-stack mode, which allows variable 788 // stack size; and fixed-stack mode. NPTL is always floating-stack. 789 if (os::Bsd::is_NPTL() || os::Bsd::supports_variable_stack_size()) { 790 os::Bsd::set_is_floating_stack(); 791 } 792 } 793 794 ///////////////////////////////////////////////////////////////////////////// 795 // thread stack 796 797 // Force Bsd kernel to expand current thread stack. If "bottom" is close 798 // to the stack guard, caller should block all signals. 799 // 800 // MAP_GROWSDOWN: 801 // A special mmap() flag that is used to implement thread stacks. It tells 802 // kernel that the memory region should extend downwards when needed. This 803 // allows early versions of BsdThreads to only mmap the first few pages 804 // when creating a new thread. Bsd kernel will automatically expand thread 805 // stack as needed (on page faults). 806 // 807 // However, because the memory region of a MAP_GROWSDOWN stack can grow on 808 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN 809 // region, it's hard to tell if the fault is due to a legitimate stack 810 // access or because of reading/writing non-exist memory (e.g. buffer 811 // overrun). As a rule, if the fault happens below current stack pointer, 812 // Bsd kernel does not expand stack, instead a SIGSEGV is sent to the 813 // application (see Bsd kernel fault.c). 814 // 815 // This Bsd feature can cause SIGSEGV when VM bangs thread stack for 816 // stack overflow detection. 817 // 818 // Newer version of BsdThreads (since glibc-2.2, or, RH-7.x) and NPTL do 819 // not use this flag. However, the stack of initial thread is not created 820 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though 821 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack 822 // and then attach the thread to JVM. 823 // 824 // To get around the problem and allow stack banging on Bsd, we need to 825 // manually expand thread stack after receiving the SIGSEGV. 826 // 827 // There are two ways to expand thread stack to address "bottom", we used 828 // both of them in JVM before 1.5: 829 // 1. adjust stack pointer first so that it is below "bottom", and then 830 // touch "bottom" 831 // 2. mmap() the page in question 832 // 833 // Now alternate signal stack is gone, it's harder to use 2. For instance, 834 // if current sp is already near the lower end of page 101, and we need to 835 // call mmap() to map page 100, it is possible that part of the mmap() frame 836 // will be placed in page 100. When page 100 is mapped, it is zero-filled. 837 // That will destroy the mmap() frame and cause VM to crash. 838 // 839 // The following code works by adjusting sp first, then accessing the "bottom" 840 // page to force a page fault. Bsd kernel will then automatically expand the 841 // stack mapping. 842 // 843 // _expand_stack_to() assumes its frame size is less than page size, which 844 // should always be true if the function is not inlined. 845 846 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute 847 #define NOINLINE 848 #else 849 #define NOINLINE __attribute__ ((noinline)) 850 #endif 851 852 static void _expand_stack_to(address bottom) NOINLINE; 853 854 static void _expand_stack_to(address bottom) { 855 address sp; 856 size_t size; 857 volatile char *p; 858 859 // Adjust bottom to point to the largest address within the same page, it 860 // gives us a one-page buffer if alloca() allocates slightly more memory. 861 bottom = (address)align_size_down((uintptr_t)bottom, os::Bsd::page_size()); 862 bottom += os::Bsd::page_size() - 1; 863 864 // sp might be slightly above current stack pointer; if that's the case, we 865 // will alloca() a little more space than necessary, which is OK. Don't use 866 // os::current_stack_pointer(), as its result can be slightly below current 867 // stack pointer, causing us to not alloca enough to reach "bottom". 868 sp = (address)&sp; 869 870 if (sp > bottom) { 871 size = sp - bottom; 872 p = (volatile char *)alloca(size); 873 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); 874 p[0] = '\0'; 875 } 876 } 877 878 bool os::Bsd::manually_expand_stack(JavaThread * t, address addr) { 879 assert(t!=NULL, "just checking"); 880 assert(t->osthread()->expanding_stack(), "expand should be set"); 881 assert(t->stack_base() != NULL, "stack_base was not initialized"); 882 883 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { 884 sigset_t mask_all, old_sigset; 885 sigfillset(&mask_all); 886 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); 887 _expand_stack_to(addr); 888 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); 889 return true; 890 } 891 return false; 892 } 893 #endif 894 895 ////////////////////////////////////////////////////////////////////////////// 896 // create new thread 897 898 static address highest_vm_reserved_address(); 899 900 // check if it's safe to start a new thread 901 static bool _thread_safety_check(Thread* thread) { 902 #ifdef _ALLBSD_SOURCE 903 return true; 904 #else 905 if (os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack()) { 906 // Fixed stack BsdThreads (SuSE Bsd/x86, and some versions of Redhat) 907 // Heap is mmap'ed at lower end of memory space. Thread stacks are 908 // allocated (MAP_FIXED) from high address space. Every thread stack 909 // occupies a fixed size slot (usually 2Mbytes, but user can change 910 // it to other values if they rebuild BsdThreads). 911 // 912 // Problem with MAP_FIXED is that mmap() can still succeed even part of 913 // the memory region has already been mmap'ed. That means if we have too 914 // many threads and/or very large heap, eventually thread stack will 915 // collide with heap. 916 // 917 // Here we try to prevent heap/stack collision by comparing current 918 // stack bottom with the highest address that has been mmap'ed by JVM 919 // plus a safety margin for memory maps created by native code. 920 // 921 // This feature can be disabled by setting ThreadSafetyMargin to 0 922 // 923 if (ThreadSafetyMargin > 0) { 924 address stack_bottom = os::current_stack_base() - os::current_stack_size(); 925 926 // not safe if our stack extends below the safety margin 927 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); 928 } else { 929 return true; 930 } 931 } else { 932 // Floating stack BsdThreads or NPTL: 933 // Unlike fixed stack BsdThreads, thread stacks are not MAP_FIXED. When 934 // there's not enough space left, pthread_create() will fail. If we come 935 // here, that means enough space has been reserved for stack. 936 return true; 937 } 938 #endif 939 } 940 941 #ifdef __APPLE__ 942 // library handle for calling objc_registerThreadWithCollector() 943 // without static linking to the libobjc library 944 #define OBJC_LIB "/usr/lib/libobjc.dylib" 945 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" 946 typedef void (*objc_registerThreadWithCollector_t)(); 947 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 948 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 949 #endif 950 951 // Thread start routine for all newly created threads 952 static void *java_start(Thread *thread) { 953 // Try to randomize the cache line index of hot stack frames. 954 // This helps when threads of the same stack traces evict each other's 955 // cache lines. The threads can be either from the same JVM instance, or 956 // from different JVM instances. The benefit is especially true for 957 // processors with hyperthreading technology. 958 static int counter = 0; 959 int pid = os::current_process_id(); 960 alloca(((pid ^ counter++) & 7) * 128); 961 962 ThreadLocalStorage::set_thread(thread); 963 964 OSThread* osthread = thread->osthread(); 965 Monitor* sync = osthread->startThread_lock(); 966 967 // non floating stack BsdThreads needs extra check, see above 968 if (!_thread_safety_check(thread)) { 969 // notify parent thread 970 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 971 osthread->set_state(ZOMBIE); 972 sync->notify_all(); 973 return NULL; 974 } 975 976 #ifdef _ALLBSD_SOURCE 977 // thread_id is pthread_id on BSD 978 osthread->set_thread_id(::pthread_self()); 979 #else 980 // thread_id is kernel thread id (similar to Solaris LWP id) 981 osthread->set_thread_id(os::Bsd::gettid()); 982 983 if (UseNUMA) { 984 int lgrp_id = os::numa_get_group_id(); 985 if (lgrp_id != -1) { 986 thread->set_lgrp_id(lgrp_id); 987 } 988 } 989 #endif 990 // initialize signal mask for this thread 991 os::Bsd::hotspot_sigmask(thread); 992 993 // initialize floating point control register 994 os::Bsd::init_thread_fpu_state(); 995 996 #ifdef __APPLE__ 997 // register thread with objc gc 998 if (objc_registerThreadWithCollectorFunction != NULL) { 999 objc_registerThreadWithCollectorFunction(); 1000 } 1001 #endif 1002 1003 // handshaking with parent thread 1004 { 1005 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 1006 1007 // notify parent thread 1008 osthread->set_state(INITIALIZED); 1009 sync->notify_all(); 1010 1011 // wait until os::start_thread() 1012 while (osthread->get_state() == INITIALIZED) { 1013 sync->wait(Mutex::_no_safepoint_check_flag); 1014 } 1015 } 1016 1017 // call one more level start routine 1018 thread->run(); 1019 1020 return 0; 1021 } 1022 1023 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1024 assert(thread->osthread() == NULL, "caller responsible"); 1025 1026 // Allocate the OSThread object 1027 OSThread* osthread = new OSThread(NULL, NULL); 1028 if (osthread == NULL) { 1029 return false; 1030 } 1031 1032 // set the correct thread state 1033 osthread->set_thread_type(thr_type); 1034 1035 // Initial state is ALLOCATED but not INITIALIZED 1036 osthread->set_state(ALLOCATED); 1037 1038 thread->set_osthread(osthread); 1039 1040 // init thread attributes 1041 pthread_attr_t attr; 1042 pthread_attr_init(&attr); 1043 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 1044 1045 // stack size 1046 if (os::Bsd::supports_variable_stack_size()) { 1047 // calculate stack size if it's not specified by caller 1048 if (stack_size == 0) { 1049 stack_size = os::Bsd::default_stack_size(thr_type); 1050 1051 switch (thr_type) { 1052 case os::java_thread: 1053 // Java threads use ThreadStackSize which default value can be 1054 // changed with the flag -Xss 1055 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 1056 stack_size = JavaThread::stack_size_at_create(); 1057 break; 1058 case os::compiler_thread: 1059 if (CompilerThreadStackSize > 0) { 1060 stack_size = (size_t)(CompilerThreadStackSize * K); 1061 break; 1062 } // else fall through: 1063 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1064 case os::vm_thread: 1065 case os::pgc_thread: 1066 case os::cgc_thread: 1067 case os::watcher_thread: 1068 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1069 break; 1070 } 1071 } 1072 1073 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 1074 pthread_attr_setstacksize(&attr, stack_size); 1075 } else { 1076 // let pthread_create() pick the default value. 1077 } 1078 1079 #ifndef _ALLBSD_SOURCE 1080 // glibc guard page 1081 pthread_attr_setguardsize(&attr, os::Bsd::default_guard_size(thr_type)); 1082 #endif 1083 1084 ThreadState state; 1085 1086 { 1087 1088 #ifndef _ALLBSD_SOURCE 1089 // Serialize thread creation if we are running with fixed stack BsdThreads 1090 bool lock = os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack(); 1091 if (lock) { 1092 os::Bsd::createThread_lock()->lock_without_safepoint_check(); 1093 } 1094 #endif 1095 1096 pthread_t tid; 1097 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 1098 1099 pthread_attr_destroy(&attr); 1100 1101 if (ret != 0) { 1102 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1103 perror("pthread_create()"); 1104 } 1105 // Need to clean up stuff we've allocated so far 1106 thread->set_osthread(NULL); 1107 delete osthread; 1108 #ifndef _ALLBSD_SOURCE 1109 if (lock) os::Bsd::createThread_lock()->unlock(); 1110 #endif 1111 return false; 1112 } 1113 1114 // Store pthread info into the OSThread 1115 osthread->set_pthread_id(tid); 1116 1117 // Wait until child thread is either initialized or aborted 1118 { 1119 Monitor* sync_with_child = osthread->startThread_lock(); 1120 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 1121 while ((state = osthread->get_state()) == ALLOCATED) { 1122 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 1123 } 1124 } 1125 1126 #ifndef _ALLBSD_SOURCE 1127 if (lock) { 1128 os::Bsd::createThread_lock()->unlock(); 1129 } 1130 #endif 1131 } 1132 1133 // Aborted due to thread limit being reached 1134 if (state == ZOMBIE) { 1135 thread->set_osthread(NULL); 1136 delete osthread; 1137 return false; 1138 } 1139 1140 // The thread is returned suspended (in state INITIALIZED), 1141 // and is started higher up in the call chain 1142 assert(state == INITIALIZED, "race condition"); 1143 return true; 1144 } 1145 1146 ///////////////////////////////////////////////////////////////////////////// 1147 // attach existing thread 1148 1149 // bootstrap the main thread 1150 bool os::create_main_thread(JavaThread* thread) { 1151 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 1152 return create_attached_thread(thread); 1153 } 1154 1155 bool os::create_attached_thread(JavaThread* thread) { 1156 #ifdef ASSERT 1157 thread->verify_not_published(); 1158 #endif 1159 1160 // Allocate the OSThread object 1161 OSThread* osthread = new OSThread(NULL, NULL); 1162 1163 if (osthread == NULL) { 1164 return false; 1165 } 1166 1167 // Store pthread info into the OSThread 1168 #ifdef _ALLBSD_SOURCE 1169 osthread->set_thread_id(::pthread_self()); 1170 #else 1171 osthread->set_thread_id(os::Bsd::gettid()); 1172 #endif 1173 osthread->set_pthread_id(::pthread_self()); 1174 1175 // initialize floating point control register 1176 os::Bsd::init_thread_fpu_state(); 1177 1178 // Initial thread state is RUNNABLE 1179 osthread->set_state(RUNNABLE); 1180 1181 thread->set_osthread(osthread); 1182 1183 #ifndef _ALLBSD_SOURCE 1184 if (UseNUMA) { 1185 int lgrp_id = os::numa_get_group_id(); 1186 if (lgrp_id != -1) { 1187 thread->set_lgrp_id(lgrp_id); 1188 } 1189 } 1190 1191 if (os::Bsd::is_initial_thread()) { 1192 // If current thread is initial thread, its stack is mapped on demand, 1193 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map 1194 // the entire stack region to avoid SEGV in stack banging. 1195 // It is also useful to get around the heap-stack-gap problem on SuSE 1196 // kernel (see 4821821 for details). We first expand stack to the top 1197 // of yellow zone, then enable stack yellow zone (order is significant, 1198 // enabling yellow zone first will crash JVM on SuSE Bsd), so there 1199 // is no gap between the last two virtual memory regions. 1200 1201 JavaThread *jt = (JavaThread *)thread; 1202 address addr = jt->stack_yellow_zone_base(); 1203 assert(addr != NULL, "initialization problem?"); 1204 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); 1205 1206 osthread->set_expanding_stack(); 1207 os::Bsd::manually_expand_stack(jt, addr); 1208 osthread->clear_expanding_stack(); 1209 } 1210 #endif 1211 1212 // initialize signal mask for this thread 1213 // and save the caller's signal mask 1214 os::Bsd::hotspot_sigmask(thread); 1215 1216 return true; 1217 } 1218 1219 void os::pd_start_thread(Thread* thread) { 1220 OSThread * osthread = thread->osthread(); 1221 assert(osthread->get_state() != INITIALIZED, "just checking"); 1222 Monitor* sync_with_child = osthread->startThread_lock(); 1223 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 1224 sync_with_child->notify(); 1225 } 1226 1227 // Free Bsd resources related to the OSThread 1228 void os::free_thread(OSThread* osthread) { 1229 assert(osthread != NULL, "osthread not set"); 1230 1231 if (Thread::current()->osthread() == osthread) { 1232 // Restore caller's signal mask 1233 sigset_t sigmask = osthread->caller_sigmask(); 1234 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1235 } 1236 1237 delete osthread; 1238 } 1239 1240 ////////////////////////////////////////////////////////////////////////////// 1241 // thread local storage 1242 1243 int os::allocate_thread_local_storage() { 1244 pthread_key_t key; 1245 int rslt = pthread_key_create(&key, NULL); 1246 assert(rslt == 0, "cannot allocate thread local storage"); 1247 return (int)key; 1248 } 1249 1250 // Note: This is currently not used by VM, as we don't destroy TLS key 1251 // on VM exit. 1252 void os::free_thread_local_storage(int index) { 1253 int rslt = pthread_key_delete((pthread_key_t)index); 1254 assert(rslt == 0, "invalid index"); 1255 } 1256 1257 void os::thread_local_storage_at_put(int index, void* value) { 1258 int rslt = pthread_setspecific((pthread_key_t)index, value); 1259 assert(rslt == 0, "pthread_setspecific failed"); 1260 } 1261 1262 extern "C" Thread* get_thread() { 1263 return ThreadLocalStorage::thread(); 1264 } 1265 1266 ////////////////////////////////////////////////////////////////////////////// 1267 // initial thread 1268 1269 #ifndef _ALLBSD_SOURCE 1270 // Check if current thread is the initial thread, similar to Solaris thr_main. 1271 bool os::Bsd::is_initial_thread(void) { 1272 char dummy; 1273 // If called before init complete, thread stack bottom will be null. 1274 // Can be called if fatal error occurs before initialization. 1275 if (initial_thread_stack_bottom() == NULL) return false; 1276 assert(initial_thread_stack_bottom() != NULL && 1277 initial_thread_stack_size() != 0, 1278 "os::init did not locate initial thread's stack region"); 1279 if ((address)&dummy >= initial_thread_stack_bottom() && 1280 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) 1281 return true; 1282 else return false; 1283 } 1284 1285 // Find the virtual memory area that contains addr 1286 static bool find_vma(address addr, address* vma_low, address* vma_high) { 1287 FILE *fp = fopen("/proc/self/maps", "r"); 1288 if (fp) { 1289 address low, high; 1290 while (!feof(fp)) { 1291 if (fscanf(fp, "%p-%p", &low, &high) == 2) { 1292 if (low <= addr && addr < high) { 1293 if (vma_low) *vma_low = low; 1294 if (vma_high) *vma_high = high; 1295 fclose (fp); 1296 return true; 1297 } 1298 } 1299 for (;;) { 1300 int ch = fgetc(fp); 1301 if (ch == EOF || ch == (int)'\n') break; 1302 } 1303 } 1304 fclose(fp); 1305 } 1306 return false; 1307 } 1308 1309 // Locate initial thread stack. This special handling of initial thread stack 1310 // is needed because pthread_getattr_np() on most (all?) Bsd distros returns 1311 // bogus value for initial thread. 1312 void os::Bsd::capture_initial_stack(size_t max_size) { 1313 // stack size is the easy part, get it from RLIMIT_STACK 1314 size_t stack_size; 1315 struct rlimit rlim; 1316 getrlimit(RLIMIT_STACK, &rlim); 1317 stack_size = rlim.rlim_cur; 1318 1319 // 6308388: a bug in ld.so will relocate its own .data section to the 1320 // lower end of primordial stack; reduce ulimit -s value a little bit 1321 // so we won't install guard page on ld.so's data section. 1322 stack_size -= 2 * page_size(); 1323 1324 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat 1325 // 7.1, in both cases we will get 2G in return value. 1326 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, 1327 // SuSE 7.2, Debian) can not handle alternate signal stack correctly 1328 // for initial thread if its stack size exceeds 6M. Cap it at 2M, 1329 // in case other parts in glibc still assumes 2M max stack size. 1330 // FIXME: alt signal stack is gone, maybe we can relax this constraint? 1331 #ifndef IA64 1332 if (stack_size > 2 * K * K) stack_size = 2 * K * K; 1333 #else 1334 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small 1335 if (stack_size > 4 * K * K) stack_size = 4 * K * K; 1336 #endif 1337 1338 // Try to figure out where the stack base (top) is. This is harder. 1339 // 1340 // When an application is started, glibc saves the initial stack pointer in 1341 // a global variable "__libc_stack_end", which is then used by system 1342 // libraries. __libc_stack_end should be pretty close to stack top. The 1343 // variable is available since the very early days. However, because it is 1344 // a private interface, it could disappear in the future. 1345 // 1346 // Bsd kernel saves start_stack information in /proc/<pid>/stat. Similar 1347 // to __libc_stack_end, it is very close to stack top, but isn't the real 1348 // stack top. Note that /proc may not exist if VM is running as a chroot 1349 // program, so reading /proc/<pid>/stat could fail. Also the contents of 1350 // /proc/<pid>/stat could change in the future (though unlikely). 1351 // 1352 // We try __libc_stack_end first. If that doesn't work, look for 1353 // /proc/<pid>/stat. If neither of them works, we use current stack pointer 1354 // as a hint, which should work well in most cases. 1355 1356 uintptr_t stack_start; 1357 1358 // try __libc_stack_end first 1359 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); 1360 if (p && *p) { 1361 stack_start = *p; 1362 } else { 1363 // see if we can get the start_stack field from /proc/self/stat 1364 FILE *fp; 1365 int pid; 1366 char state; 1367 int ppid; 1368 int pgrp; 1369 int session; 1370 int nr; 1371 int tpgrp; 1372 unsigned long flags; 1373 unsigned long minflt; 1374 unsigned long cminflt; 1375 unsigned long majflt; 1376 unsigned long cmajflt; 1377 unsigned long utime; 1378 unsigned long stime; 1379 long cutime; 1380 long cstime; 1381 long prio; 1382 long nice; 1383 long junk; 1384 long it_real; 1385 uintptr_t start; 1386 uintptr_t vsize; 1387 intptr_t rss; 1388 uintptr_t rsslim; 1389 uintptr_t scodes; 1390 uintptr_t ecode; 1391 int i; 1392 1393 // Figure what the primordial thread stack base is. Code is inspired 1394 // by email from Hans Boehm. /proc/self/stat begins with current pid, 1395 // followed by command name surrounded by parentheses, state, etc. 1396 char stat[2048]; 1397 int statlen; 1398 1399 fp = fopen("/proc/self/stat", "r"); 1400 if (fp) { 1401 statlen = fread(stat, 1, 2047, fp); 1402 stat[statlen] = '\0'; 1403 fclose(fp); 1404 1405 // Skip pid and the command string. Note that we could be dealing with 1406 // weird command names, e.g. user could decide to rename java launcher 1407 // to "java 1.4.2 :)", then the stat file would look like 1408 // 1234 (java 1.4.2 :)) R ... ... 1409 // We don't really need to know the command string, just find the last 1410 // occurrence of ")" and then start parsing from there. See bug 4726580. 1411 char * s = strrchr(stat, ')'); 1412 1413 i = 0; 1414 if (s) { 1415 // Skip blank chars 1416 do s++; while (isspace(*s)); 1417 1418 #define _UFM UINTX_FORMAT 1419 #define _DFM INTX_FORMAT 1420 1421 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ 1422 /* 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 */ 1423 i = sscanf(s, "%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld " _UFM _UFM _DFM _UFM _UFM _UFM _UFM, 1424 &state, /* 3 %c */ 1425 &ppid, /* 4 %d */ 1426 &pgrp, /* 5 %d */ 1427 &session, /* 6 %d */ 1428 &nr, /* 7 %d */ 1429 &tpgrp, /* 8 %d */ 1430 &flags, /* 9 %lu */ 1431 &minflt, /* 10 %lu */ 1432 &cminflt, /* 11 %lu */ 1433 &majflt, /* 12 %lu */ 1434 &cmajflt, /* 13 %lu */ 1435 &utime, /* 14 %lu */ 1436 &stime, /* 15 %lu */ 1437 &cutime, /* 16 %ld */ 1438 &cstime, /* 17 %ld */ 1439 &prio, /* 18 %ld */ 1440 &nice, /* 19 %ld */ 1441 &junk, /* 20 %ld */ 1442 &it_real, /* 21 %ld */ 1443 &start, /* 22 UINTX_FORMAT */ 1444 &vsize, /* 23 UINTX_FORMAT */ 1445 &rss, /* 24 INTX_FORMAT */ 1446 &rsslim, /* 25 UINTX_FORMAT */ 1447 &scodes, /* 26 UINTX_FORMAT */ 1448 &ecode, /* 27 UINTX_FORMAT */ 1449 &stack_start); /* 28 UINTX_FORMAT */ 1450 } 1451 1452 #undef _UFM 1453 #undef _DFM 1454 1455 if (i != 28 - 2) { 1456 assert(false, "Bad conversion from /proc/self/stat"); 1457 // product mode - assume we are the initial thread, good luck in the 1458 // embedded case. 1459 warning("Can't detect initial thread stack location - bad conversion"); 1460 stack_start = (uintptr_t) &rlim; 1461 } 1462 } else { 1463 // For some reason we can't open /proc/self/stat (for example, running on 1464 // FreeBSD with a Bsd emulator, or inside chroot), this should work for 1465 // most cases, so don't abort: 1466 warning("Can't detect initial thread stack location - no /proc/self/stat"); 1467 stack_start = (uintptr_t) &rlim; 1468 } 1469 } 1470 1471 // Now we have a pointer (stack_start) very close to the stack top, the 1472 // next thing to do is to figure out the exact location of stack top. We 1473 // can find out the virtual memory area that contains stack_start by 1474 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, 1475 // and its upper limit is the real stack top. (again, this would fail if 1476 // running inside chroot, because /proc may not exist.) 1477 1478 uintptr_t stack_top; 1479 address low, high; 1480 if (find_vma((address)stack_start, &low, &high)) { 1481 // success, "high" is the true stack top. (ignore "low", because initial 1482 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) 1483 stack_top = (uintptr_t)high; 1484 } else { 1485 // failed, likely because /proc/self/maps does not exist 1486 warning("Can't detect initial thread stack location - find_vma failed"); 1487 // best effort: stack_start is normally within a few pages below the real 1488 // stack top, use it as stack top, and reduce stack size so we won't put 1489 // guard page outside stack. 1490 stack_top = stack_start; 1491 stack_size -= 16 * page_size(); 1492 } 1493 1494 // stack_top could be partially down the page so align it 1495 stack_top = align_size_up(stack_top, page_size()); 1496 1497 if (max_size && stack_size > max_size) { 1498 _initial_thread_stack_size = max_size; 1499 } else { 1500 _initial_thread_stack_size = stack_size; 1501 } 1502 1503 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); 1504 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; 1505 } 1506 #endif 1507 1508 //////////////////////////////////////////////////////////////////////////////// 1509 // time support 1510 1511 // Time since start-up in seconds to a fine granularity. 1512 // Used by VMSelfDestructTimer and the MemProfiler. 1513 double os::elapsedTime() { 1514 1515 return (double)(os::elapsed_counter()) * 0.000001; 1516 } 1517 1518 jlong os::elapsed_counter() { 1519 timeval time; 1520 int status = gettimeofday(&time, NULL); 1521 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 1522 } 1523 1524 jlong os::elapsed_frequency() { 1525 return (1000 * 1000); 1526 } 1527 1528 // XXX: For now, code this as if BSD does not support vtime. 1529 bool os::supports_vtime() { return false; } 1530 bool os::enable_vtime() { return false; } 1531 bool os::vtime_enabled() { return false; } 1532 double os::elapsedVTime() { 1533 // better than nothing, but not much 1534 return elapsedTime(); 1535 } 1536 1537 jlong os::javaTimeMillis() { 1538 timeval time; 1539 int status = gettimeofday(&time, NULL); 1540 assert(status != -1, "bsd error"); 1541 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1542 } 1543 1544 #ifndef CLOCK_MONOTONIC 1545 #define CLOCK_MONOTONIC (1) 1546 #endif 1547 1548 #ifdef __APPLE__ 1549 void os::Bsd::clock_init() { 1550 // XXXDARWIN: Investigate replacement monotonic clock 1551 } 1552 #elif defined(_ALLBSD_SOURCE) 1553 void os::Bsd::clock_init() { 1554 struct timespec res; 1555 struct timespec tp; 1556 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 1557 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 1558 // yes, monotonic clock is supported 1559 _clock_gettime = ::clock_gettime; 1560 } 1561 } 1562 #else 1563 void os::Bsd::clock_init() { 1564 // we do dlopen's in this particular order due to bug in bsd 1565 // dynamical loader (see 6348968) leading to crash on exit 1566 void* handle = dlopen("librt.so.1", RTLD_LAZY); 1567 if (handle == NULL) { 1568 handle = dlopen("librt.so", RTLD_LAZY); 1569 } 1570 1571 if (handle) { 1572 int (*clock_getres_func)(clockid_t, struct timespec*) = 1573 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); 1574 int (*clock_gettime_func)(clockid_t, struct timespec*) = 1575 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); 1576 if (clock_getres_func && clock_gettime_func) { 1577 // See if monotonic clock is supported by the kernel. Note that some 1578 // early implementations simply return kernel jiffies (updated every 1579 // 1/100 or 1/1000 second). It would be bad to use such a low res clock 1580 // for nano time (though the monotonic property is still nice to have). 1581 // It's fixed in newer kernels, however clock_getres() still returns 1582 // 1/HZ. We check if clock_getres() works, but will ignore its reported 1583 // resolution for now. Hopefully as people move to new kernels, this 1584 // won't be a problem. 1585 struct timespec res; 1586 struct timespec tp; 1587 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && 1588 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { 1589 // yes, monotonic clock is supported 1590 _clock_gettime = clock_gettime_func; 1591 } else { 1592 // close librt if there is no monotonic clock 1593 dlclose(handle); 1594 } 1595 } 1596 } 1597 } 1598 #endif 1599 1600 #ifndef _ALLBSD_SOURCE 1601 #ifndef SYS_clock_getres 1602 1603 #if defined(IA32) || defined(AMD64) 1604 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) 1605 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) 1606 #else 1607 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" 1608 #define sys_clock_getres(x,y) -1 1609 #endif 1610 1611 #else 1612 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) 1613 #endif 1614 1615 void os::Bsd::fast_thread_clock_init() { 1616 if (!UseBsdPosixThreadCPUClocks) { 1617 return; 1618 } 1619 clockid_t clockid; 1620 struct timespec tp; 1621 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = 1622 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); 1623 1624 // Switch to using fast clocks for thread cpu time if 1625 // the sys_clock_getres() returns 0 error code. 1626 // Note, that some kernels may support the current thread 1627 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks 1628 // returned by the pthread_getcpuclockid(). 1629 // If the fast Posix clocks are supported then the sys_clock_getres() 1630 // must return at least tp.tv_sec == 0 which means a resolution 1631 // better than 1 sec. This is extra check for reliability. 1632 1633 if(pthread_getcpuclockid_func && 1634 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && 1635 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { 1636 1637 _supports_fast_thread_cpu_time = true; 1638 _pthread_getcpuclockid = pthread_getcpuclockid_func; 1639 } 1640 } 1641 #endif 1642 1643 jlong os::javaTimeNanos() { 1644 if (Bsd::supports_monotonic_clock()) { 1645 struct timespec tp; 1646 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 1647 assert(status == 0, "gettime error"); 1648 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 1649 return result; 1650 } else { 1651 timeval time; 1652 int status = gettimeofday(&time, NULL); 1653 assert(status != -1, "bsd error"); 1654 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1655 return 1000 * usecs; 1656 } 1657 } 1658 1659 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1660 if (Bsd::supports_monotonic_clock()) { 1661 info_ptr->max_value = ALL_64_BITS; 1662 1663 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1664 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1665 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1666 } else { 1667 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1668 info_ptr->max_value = ALL_64_BITS; 1669 1670 // gettimeofday is a real time clock so it skips 1671 info_ptr->may_skip_backward = true; 1672 info_ptr->may_skip_forward = true; 1673 } 1674 1675 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1676 } 1677 1678 // Return the real, user, and system times in seconds from an 1679 // arbitrary fixed point in the past. 1680 bool os::getTimesSecs(double* process_real_time, 1681 double* process_user_time, 1682 double* process_system_time) { 1683 struct tms ticks; 1684 clock_t real_ticks = times(&ticks); 1685 1686 if (real_ticks == (clock_t) (-1)) { 1687 return false; 1688 } else { 1689 double ticks_per_second = (double) clock_tics_per_sec; 1690 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1691 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1692 *process_real_time = ((double) real_ticks) / ticks_per_second; 1693 1694 return true; 1695 } 1696 } 1697 1698 1699 char * os::local_time_string(char *buf, size_t buflen) { 1700 struct tm t; 1701 time_t long_time; 1702 time(&long_time); 1703 localtime_r(&long_time, &t); 1704 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1705 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1706 t.tm_hour, t.tm_min, t.tm_sec); 1707 return buf; 1708 } 1709 1710 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1711 return localtime_r(clock, res); 1712 } 1713 1714 //////////////////////////////////////////////////////////////////////////////// 1715 // runtime exit support 1716 1717 // Note: os::shutdown() might be called very early during initialization, or 1718 // called from signal handler. Before adding something to os::shutdown(), make 1719 // sure it is async-safe and can handle partially initialized VM. 1720 void os::shutdown() { 1721 1722 // allow PerfMemory to attempt cleanup of any persistent resources 1723 perfMemory_exit(); 1724 1725 // needs to remove object in file system 1726 AttachListener::abort(); 1727 1728 // flush buffered output, finish log files 1729 ostream_abort(); 1730 1731 // Check for abort hook 1732 abort_hook_t abort_hook = Arguments::abort_hook(); 1733 if (abort_hook != NULL) { 1734 abort_hook(); 1735 } 1736 1737 } 1738 1739 // Note: os::abort() might be called very early during initialization, or 1740 // called from signal handler. Before adding something to os::abort(), make 1741 // sure it is async-safe and can handle partially initialized VM. 1742 void os::abort(bool dump_core) { 1743 os::shutdown(); 1744 if (dump_core) { 1745 #ifndef PRODUCT 1746 fdStream out(defaultStream::output_fd()); 1747 out.print_raw("Current thread is "); 1748 char buf[16]; 1749 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1750 out.print_raw_cr(buf); 1751 out.print_raw_cr("Dumping core ..."); 1752 #endif 1753 ::abort(); // dump core 1754 } 1755 1756 ::exit(1); 1757 } 1758 1759 // Die immediately, no exit hook, no abort hook, no cleanup. 1760 void os::die() { 1761 // _exit() on BsdThreads only kills current thread 1762 ::abort(); 1763 } 1764 1765 // unused on bsd for now. 1766 void os::set_error_file(const char *logfile) {} 1767 1768 1769 // This method is a copy of JDK's sysGetLastErrorString 1770 // from src/solaris/hpi/src/system_md.c 1771 1772 size_t os::lasterror(char *buf, size_t len) { 1773 1774 if (errno == 0) return 0; 1775 1776 const char *s = ::strerror(errno); 1777 size_t n = ::strlen(s); 1778 if (n >= len) { 1779 n = len - 1; 1780 } 1781 ::strncpy(buf, s, n); 1782 buf[n] = '\0'; 1783 return n; 1784 } 1785 1786 intx os::current_thread_id() { return (intx)pthread_self(); } 1787 int os::current_process_id() { 1788 1789 // Under the old bsd thread library, bsd gives each thread 1790 // its own process id. Because of this each thread will return 1791 // a different pid if this method were to return the result 1792 // of getpid(2). Bsd provides no api that returns the pid 1793 // of the launcher thread for the vm. This implementation 1794 // returns a unique pid, the pid of the launcher thread 1795 // that starts the vm 'process'. 1796 1797 // Under the NPTL, getpid() returns the same pid as the 1798 // launcher thread rather than a unique pid per thread. 1799 // Use gettid() if you want the old pre NPTL behaviour. 1800 1801 // if you are looking for the result of a call to getpid() that 1802 // returns a unique pid for the calling thread, then look at the 1803 // OSThread::thread_id() method in osThread_bsd.hpp file 1804 1805 return (int)(_initial_pid ? _initial_pid : getpid()); 1806 } 1807 1808 // DLL functions 1809 1810 #define JNI_LIB_PREFIX "lib" 1811 #ifdef __APPLE__ 1812 #define JNI_LIB_SUFFIX ".dylib" 1813 #else 1814 #define JNI_LIB_SUFFIX ".so" 1815 #endif 1816 1817 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1818 1819 // This must be hard coded because it's the system's temporary 1820 // directory not the java application's temp directory, ala java.io.tmpdir. 1821 #ifdef __APPLE__ 1822 // macosx has a secure per-user temporary directory 1823 char temp_path_storage[PATH_MAX]; 1824 const char* os::get_temp_directory() { 1825 static char *temp_path = NULL; 1826 if (temp_path == NULL) { 1827 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1828 if (pathSize == 0 || pathSize > PATH_MAX) { 1829 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1830 } 1831 temp_path = temp_path_storage; 1832 } 1833 return temp_path; 1834 } 1835 #else /* __APPLE__ */ 1836 const char* os::get_temp_directory() { return "/tmp"; } 1837 #endif /* __APPLE__ */ 1838 1839 static bool file_exists(const char* filename) { 1840 struct stat statbuf; 1841 if (filename == NULL || strlen(filename) == 0) { 1842 return false; 1843 } 1844 return os::stat(filename, &statbuf) == 0; 1845 } 1846 1847 void os::dll_build_name(char* buffer, size_t buflen, 1848 const char* pname, const char* fname) { 1849 // Copied from libhpi 1850 const size_t pnamelen = pname ? strlen(pname) : 0; 1851 1852 // Quietly truncate on buffer overflow. Should be an error. 1853 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1854 *buffer = '\0'; 1855 return; 1856 } 1857 1858 if (pnamelen == 0) { 1859 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1860 } else if (strchr(pname, *os::path_separator()) != NULL) { 1861 int n; 1862 char** pelements = split_path(pname, &n); 1863 for (int i = 0 ; i < n ; i++) { 1864 // Really shouldn't be NULL, but check can't hurt 1865 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1866 continue; // skip the empty path values 1867 } 1868 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1869 pelements[i], fname); 1870 if (file_exists(buffer)) { 1871 break; 1872 } 1873 } 1874 // release the storage 1875 for (int i = 0 ; i < n ; i++) { 1876 if (pelements[i] != NULL) { 1877 FREE_C_HEAP_ARRAY(char, pelements[i]); 1878 } 1879 } 1880 if (pelements != NULL) { 1881 FREE_C_HEAP_ARRAY(char*, pelements); 1882 } 1883 } else { 1884 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1885 } 1886 } 1887 1888 const char* os::get_current_directory(char *buf, int buflen) { 1889 return getcwd(buf, buflen); 1890 } 1891 1892 // check if addr is inside libjvm[_g].so 1893 bool os::address_is_in_vm(address addr) { 1894 static address libjvm_base_addr; 1895 Dl_info dlinfo; 1896 1897 if (libjvm_base_addr == NULL) { 1898 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1899 libjvm_base_addr = (address)dlinfo.dli_fbase; 1900 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1901 } 1902 1903 if (dladdr((void *)addr, &dlinfo)) { 1904 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1905 } 1906 1907 return false; 1908 } 1909 1910 bool os::dll_address_to_function_name(address addr, char *buf, 1911 int buflen, int *offset) { 1912 Dl_info dlinfo; 1913 1914 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1915 if (buf != NULL) { 1916 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1917 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1918 } 1919 } 1920 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1921 return true; 1922 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1923 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1924 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) { 1925 return true; 1926 } 1927 } 1928 1929 if (buf != NULL) buf[0] = '\0'; 1930 if (offset != NULL) *offset = -1; 1931 return false; 1932 } 1933 1934 #ifdef _ALLBSD_SOURCE 1935 // ported from solaris version 1936 bool os::dll_address_to_library_name(address addr, char* buf, 1937 int buflen, int* offset) { 1938 Dl_info dlinfo; 1939 1940 if (dladdr((void*)addr, &dlinfo)){ 1941 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1942 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1943 return true; 1944 } else { 1945 if (buf) buf[0] = '\0'; 1946 if (offset) *offset = -1; 1947 return false; 1948 } 1949 } 1950 #else 1951 struct _address_to_library_name { 1952 address addr; // input : memory address 1953 size_t buflen; // size of fname 1954 char* fname; // output: library name 1955 address base; // library base addr 1956 }; 1957 1958 static int address_to_library_name_callback(struct dl_phdr_info *info, 1959 size_t size, void *data) { 1960 int i; 1961 bool found = false; 1962 address libbase = NULL; 1963 struct _address_to_library_name * d = (struct _address_to_library_name *)data; 1964 1965 // iterate through all loadable segments 1966 for (i = 0; i < info->dlpi_phnum; i++) { 1967 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); 1968 if (info->dlpi_phdr[i].p_type == PT_LOAD) { 1969 // base address of a library is the lowest address of its loaded 1970 // segments. 1971 if (libbase == NULL || libbase > segbase) { 1972 libbase = segbase; 1973 } 1974 // see if 'addr' is within current segment 1975 if (segbase <= d->addr && 1976 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { 1977 found = true; 1978 } 1979 } 1980 } 1981 1982 // dlpi_name is NULL or empty if the ELF file is executable, return 0 1983 // so dll_address_to_library_name() can fall through to use dladdr() which 1984 // can figure out executable name from argv[0]. 1985 if (found && info->dlpi_name && info->dlpi_name[0]) { 1986 d->base = libbase; 1987 if (d->fname) { 1988 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); 1989 } 1990 return 1; 1991 } 1992 return 0; 1993 } 1994 1995 bool os::dll_address_to_library_name(address addr, char* buf, 1996 int buflen, int* offset) { 1997 Dl_info dlinfo; 1998 struct _address_to_library_name data; 1999 2000 // There is a bug in old glibc dladdr() implementation that it could resolve 2001 // to wrong library name if the .so file has a base address != NULL. Here 2002 // we iterate through the program headers of all loaded libraries to find 2003 // out which library 'addr' really belongs to. This workaround can be 2004 // removed once the minimum requirement for glibc is moved to 2.3.x. 2005 data.addr = addr; 2006 data.fname = buf; 2007 data.buflen = buflen; 2008 data.base = NULL; 2009 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); 2010 2011 if (rslt) { 2012 // buf already contains library name 2013 if (offset) *offset = addr - data.base; 2014 return true; 2015 } else if (dladdr((void*)addr, &dlinfo)){ 2016 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 2017 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 2018 return true; 2019 } else { 2020 if (buf) buf[0] = '\0'; 2021 if (offset) *offset = -1; 2022 return false; 2023 } 2024 } 2025 #endif 2026 2027 // Loads .dll/.so and 2028 // in case of error it checks if .dll/.so was built for the 2029 // same architecture as Hotspot is running on 2030 2031 #ifdef __APPLE__ 2032 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 2033 void * result= ::dlopen(filename, RTLD_LAZY); 2034 if (result != NULL) { 2035 // Successful loading 2036 return result; 2037 } 2038 2039 // Read system error message into ebuf 2040 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2041 ebuf[ebuflen-1]='\0'; 2042 2043 return NULL; 2044 } 2045 #else 2046 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 2047 { 2048 void * result= ::dlopen(filename, RTLD_LAZY); 2049 if (result != NULL) { 2050 // Successful loading 2051 return result; 2052 } 2053 2054 Elf32_Ehdr elf_head; 2055 2056 // Read system error message into ebuf 2057 // It may or may not be overwritten below 2058 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2059 ebuf[ebuflen-1]='\0'; 2060 int diag_msg_max_length=ebuflen-strlen(ebuf); 2061 char* diag_msg_buf=ebuf+strlen(ebuf); 2062 2063 if (diag_msg_max_length==0) { 2064 // No more space in ebuf for additional diagnostics message 2065 return NULL; 2066 } 2067 2068 2069 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 2070 2071 if (file_descriptor < 0) { 2072 // Can't open library, report dlerror() message 2073 return NULL; 2074 } 2075 2076 bool failed_to_read_elf_head= 2077 (sizeof(elf_head)!= 2078 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 2079 2080 ::close(file_descriptor); 2081 if (failed_to_read_elf_head) { 2082 // file i/o error - report dlerror() msg 2083 return NULL; 2084 } 2085 2086 typedef struct { 2087 Elf32_Half code; // Actual value as defined in elf.h 2088 Elf32_Half compat_class; // Compatibility of archs at VM's sense 2089 char elf_class; // 32 or 64 bit 2090 char endianess; // MSB or LSB 2091 char* name; // String representation 2092 } arch_t; 2093 2094 #ifndef EM_486 2095 #define EM_486 6 /* Intel 80486 */ 2096 #endif 2097 2098 #ifndef EM_MIPS_RS3_LE 2099 #define EM_MIPS_RS3_LE 10 /* MIPS */ 2100 #endif 2101 2102 #ifndef EM_PPC64 2103 #define EM_PPC64 21 /* PowerPC64 */ 2104 #endif 2105 2106 #ifndef EM_S390 2107 #define EM_S390 22 /* IBM System/390 */ 2108 #endif 2109 2110 #ifndef EM_IA_64 2111 #define EM_IA_64 50 /* HP/Intel IA-64 */ 2112 #endif 2113 2114 #ifndef EM_X86_64 2115 #define EM_X86_64 62 /* AMD x86-64 */ 2116 #endif 2117 2118 static const arch_t arch_array[]={ 2119 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2120 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2121 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 2122 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 2123 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2124 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2125 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2126 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2127 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2128 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 2129 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 2130 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 2131 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 2132 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 2133 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 2134 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 2135 }; 2136 2137 #if (defined IA32) 2138 static Elf32_Half running_arch_code=EM_386; 2139 #elif (defined AMD64) 2140 static Elf32_Half running_arch_code=EM_X86_64; 2141 #elif (defined IA64) 2142 static Elf32_Half running_arch_code=EM_IA_64; 2143 #elif (defined __sparc) && (defined _LP64) 2144 static Elf32_Half running_arch_code=EM_SPARCV9; 2145 #elif (defined __sparc) && (!defined _LP64) 2146 static Elf32_Half running_arch_code=EM_SPARC; 2147 #elif (defined __powerpc64__) 2148 static Elf32_Half running_arch_code=EM_PPC64; 2149 #elif (defined __powerpc__) 2150 static Elf32_Half running_arch_code=EM_PPC; 2151 #elif (defined ARM) 2152 static Elf32_Half running_arch_code=EM_ARM; 2153 #elif (defined S390) 2154 static Elf32_Half running_arch_code=EM_S390; 2155 #elif (defined ALPHA) 2156 static Elf32_Half running_arch_code=EM_ALPHA; 2157 #elif (defined MIPSEL) 2158 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 2159 #elif (defined PARISC) 2160 static Elf32_Half running_arch_code=EM_PARISC; 2161 #elif (defined MIPS) 2162 static Elf32_Half running_arch_code=EM_MIPS; 2163 #elif (defined M68K) 2164 static Elf32_Half running_arch_code=EM_68K; 2165 #else 2166 #error Method os::dll_load requires that one of following is defined:\ 2167 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 2168 #endif 2169 2170 // Identify compatability class for VM's architecture and library's architecture 2171 // Obtain string descriptions for architectures 2172 2173 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2174 int running_arch_index=-1; 2175 2176 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2177 if (running_arch_code == arch_array[i].code) { 2178 running_arch_index = i; 2179 } 2180 if (lib_arch.code == arch_array[i].code) { 2181 lib_arch.compat_class = arch_array[i].compat_class; 2182 lib_arch.name = arch_array[i].name; 2183 } 2184 } 2185 2186 assert(running_arch_index != -1, 2187 "Didn't find running architecture code (running_arch_code) in arch_array"); 2188 if (running_arch_index == -1) { 2189 // Even though running architecture detection failed 2190 // we may still continue with reporting dlerror() message 2191 return NULL; 2192 } 2193 2194 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2195 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2196 return NULL; 2197 } 2198 2199 #ifndef S390 2200 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2201 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2202 return NULL; 2203 } 2204 #endif // !S390 2205 2206 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2207 if ( lib_arch.name!=NULL ) { 2208 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2209 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2210 lib_arch.name, arch_array[running_arch_index].name); 2211 } else { 2212 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2213 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2214 lib_arch.code, 2215 arch_array[running_arch_index].name); 2216 } 2217 } 2218 2219 return NULL; 2220 } 2221 #endif /* !__APPLE__ */ 2222 2223 // XXX: Do we need a lock around this as per Linux? 2224 void* os::dll_lookup(void* handle, const char* name) { 2225 return dlsym(handle, name); 2226 } 2227 2228 2229 static bool _print_ascii_file(const char* filename, outputStream* st) { 2230 int fd = ::open(filename, O_RDONLY); 2231 if (fd == -1) { 2232 return false; 2233 } 2234 2235 char buf[32]; 2236 int bytes; 2237 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2238 st->print_raw(buf, bytes); 2239 } 2240 2241 ::close(fd); 2242 2243 return true; 2244 } 2245 2246 void os::print_dll_info(outputStream *st) { 2247 st->print_cr("Dynamic libraries:"); 2248 #ifdef _ALLBSD_SOURCE 2249 #ifdef RTLD_DI_LINKMAP 2250 Dl_info dli; 2251 void *handle; 2252 Link_map *map; 2253 Link_map *p; 2254 2255 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 2256 st->print_cr("Error: Cannot print dynamic libraries."); 2257 return; 2258 } 2259 handle = dlopen(dli.dli_fname, RTLD_LAZY); 2260 if (handle == NULL) { 2261 st->print_cr("Error: Cannot print dynamic libraries."); 2262 return; 2263 } 2264 dlinfo(handle, RTLD_DI_LINKMAP, &map); 2265 if (map == NULL) { 2266 st->print_cr("Error: Cannot print dynamic libraries."); 2267 return; 2268 } 2269 2270 while (map->l_prev != NULL) 2271 map = map->l_prev; 2272 2273 while (map != NULL) { 2274 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 2275 map = map->l_next; 2276 } 2277 2278 dlclose(handle); 2279 #elif defined(__APPLE__) 2280 uint32_t count; 2281 uint32_t i; 2282 2283 count = _dyld_image_count(); 2284 for (i = 1; i < count; i++) { 2285 const char *name = _dyld_get_image_name(i); 2286 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 2287 st->print_cr(PTR_FORMAT " \t%s", slide, name); 2288 } 2289 #else 2290 st->print_cr("Error: Cannot print dynamic libraries."); 2291 #endif 2292 #else 2293 char fname[32]; 2294 pid_t pid = os::Bsd::gettid(); 2295 2296 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); 2297 2298 if (!_print_ascii_file(fname, st)) { 2299 st->print("Can not get library information for pid = %d\n", pid); 2300 } 2301 #endif 2302 } 2303 2304 2305 void os::print_os_info(outputStream* st) { 2306 st->print("OS:"); 2307 2308 // Try to identify popular distros. 2309 // Most Bsd distributions have /etc/XXX-release file, which contains 2310 // the OS version string. Some have more than one /etc/XXX-release file 2311 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), 2312 // so the order is important. 2313 if (!_print_ascii_file("/etc/mandrake-release", st) && 2314 !_print_ascii_file("/etc/sun-release", st) && 2315 !_print_ascii_file("/etc/redhat-release", st) && 2316 !_print_ascii_file("/etc/SuSE-release", st) && 2317 !_print_ascii_file("/etc/turbobsd-release", st) && 2318 !_print_ascii_file("/etc/gentoo-release", st) && 2319 !_print_ascii_file("/etc/debian_version", st) && 2320 !_print_ascii_file("/etc/ltib-release", st) && 2321 !_print_ascii_file("/etc/angstrom-version", st)) { 2322 st->print("Bsd"); 2323 } 2324 st->cr(); 2325 2326 // kernel 2327 st->print("uname:"); 2328 struct utsname name; 2329 uname(&name); 2330 st->print(name.sysname); st->print(" "); 2331 st->print(name.release); st->print(" "); 2332 st->print(name.version); st->print(" "); 2333 st->print(name.machine); 2334 st->cr(); 2335 2336 #ifndef _ALLBSD_SOURCE 2337 // Print warning if unsafe chroot environment detected 2338 if (unsafe_chroot_detected) { 2339 st->print("WARNING!! "); 2340 st->print_cr(unstable_chroot_error); 2341 } 2342 2343 // libc, pthread 2344 st->print("libc:"); 2345 st->print(os::Bsd::glibc_version()); st->print(" "); 2346 st->print(os::Bsd::libpthread_version()); st->print(" "); 2347 if (os::Bsd::is_BsdThreads()) { 2348 st->print("(%s stack)", os::Bsd::is_floating_stack() ? "floating" : "fixed"); 2349 } 2350 st->cr(); 2351 #endif 2352 2353 // rlimit 2354 st->print("rlimit:"); 2355 struct rlimit rlim; 2356 2357 st->print(" STACK "); 2358 getrlimit(RLIMIT_STACK, &rlim); 2359 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2360 else st->print("%uk", rlim.rlim_cur >> 10); 2361 2362 st->print(", CORE "); 2363 getrlimit(RLIMIT_CORE, &rlim); 2364 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2365 else st->print("%uk", rlim.rlim_cur >> 10); 2366 2367 st->print(", NPROC "); 2368 getrlimit(RLIMIT_NPROC, &rlim); 2369 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2370 else st->print("%d", rlim.rlim_cur); 2371 2372 st->print(", NOFILE "); 2373 getrlimit(RLIMIT_NOFILE, &rlim); 2374 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2375 else st->print("%d", rlim.rlim_cur); 2376 2377 #ifndef _ALLBSD_SOURCE 2378 st->print(", AS "); 2379 getrlimit(RLIMIT_AS, &rlim); 2380 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2381 else st->print("%uk", rlim.rlim_cur >> 10); 2382 st->cr(); 2383 2384 // load average 2385 st->print("load average:"); 2386 double loadavg[3]; 2387 os::loadavg(loadavg, 3); 2388 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 2389 st->cr(); 2390 #endif 2391 } 2392 2393 void os::pd_print_cpu_info(outputStream* st) { 2394 // Nothing to do for now. 2395 } 2396 2397 void os::print_memory_info(outputStream* st) { 2398 2399 st->print("Memory:"); 2400 st->print(" %dk page", os::vm_page_size()>>10); 2401 2402 #ifndef _ALLBSD_SOURCE 2403 // values in struct sysinfo are "unsigned long" 2404 struct sysinfo si; 2405 sysinfo(&si); 2406 #endif 2407 2408 st->print(", physical " UINT64_FORMAT "k", 2409 os::physical_memory() >> 10); 2410 st->print("(" UINT64_FORMAT "k free)", 2411 os::available_memory() >> 10); 2412 #ifndef _ALLBSD_SOURCE 2413 st->print(", swap " UINT64_FORMAT "k", 2414 ((jlong)si.totalswap * si.mem_unit) >> 10); 2415 st->print("(" UINT64_FORMAT "k free)", 2416 ((jlong)si.freeswap * si.mem_unit) >> 10); 2417 #endif 2418 st->cr(); 2419 2420 // meminfo 2421 st->print("\n/proc/meminfo:\n"); 2422 _print_ascii_file("/proc/meminfo", st); 2423 st->cr(); 2424 } 2425 2426 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 2427 // but they're the same for all the bsd arch that we support 2428 // and they're the same for solaris but there's no common place to put this. 2429 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2430 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2431 "ILL_COPROC", "ILL_BADSTK" }; 2432 2433 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2434 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2435 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 2436 2437 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2438 2439 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2440 2441 void os::print_siginfo(outputStream* st, void* siginfo) { 2442 st->print("siginfo:"); 2443 2444 const int buflen = 100; 2445 char buf[buflen]; 2446 siginfo_t *si = (siginfo_t*)siginfo; 2447 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2448 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 2449 st->print("si_errno=%s", buf); 2450 } else { 2451 st->print("si_errno=%d", si->si_errno); 2452 } 2453 const int c = si->si_code; 2454 assert(c > 0, "unexpected si_code"); 2455 switch (si->si_signo) { 2456 case SIGILL: 2457 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2458 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2459 break; 2460 case SIGFPE: 2461 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2462 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2463 break; 2464 case SIGSEGV: 2465 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2466 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2467 break; 2468 case SIGBUS: 2469 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2470 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2471 break; 2472 default: 2473 st->print(", si_code=%d", si->si_code); 2474 // no si_addr 2475 } 2476 2477 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2478 UseSharedSpaces) { 2479 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2480 if (mapinfo->is_in_shared_space(si->si_addr)) { 2481 st->print("\n\nError accessing class data sharing archive." \ 2482 " Mapped file inaccessible during execution, " \ 2483 " possible disk/network problem."); 2484 } 2485 } 2486 st->cr(); 2487 } 2488 2489 2490 static void print_signal_handler(outputStream* st, int sig, 2491 char* buf, size_t buflen); 2492 2493 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2494 st->print_cr("Signal Handlers:"); 2495 print_signal_handler(st, SIGSEGV, buf, buflen); 2496 print_signal_handler(st, SIGBUS , buf, buflen); 2497 print_signal_handler(st, SIGFPE , buf, buflen); 2498 print_signal_handler(st, SIGPIPE, buf, buflen); 2499 print_signal_handler(st, SIGXFSZ, buf, buflen); 2500 print_signal_handler(st, SIGILL , buf, buflen); 2501 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2502 print_signal_handler(st, SR_signum, buf, buflen); 2503 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 2504 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2505 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 2506 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2507 } 2508 2509 static char saved_jvm_path[MAXPATHLEN] = {0}; 2510 2511 // Find the full path to the current module, libjvm.so or libjvm_g.so 2512 void os::jvm_path(char *buf, jint buflen) { 2513 // Error checking. 2514 if (buflen < MAXPATHLEN) { 2515 assert(false, "must use a large-enough buffer"); 2516 buf[0] = '\0'; 2517 return; 2518 } 2519 // Lazy resolve the path to current module. 2520 if (saved_jvm_path[0] != 0) { 2521 strcpy(buf, saved_jvm_path); 2522 return; 2523 } 2524 2525 char dli_fname[MAXPATHLEN]; 2526 bool ret = dll_address_to_library_name( 2527 CAST_FROM_FN_PTR(address, os::jvm_path), 2528 dli_fname, sizeof(dli_fname), NULL); 2529 assert(ret != 0, "cannot locate libjvm"); 2530 char *rp = realpath(dli_fname, buf); 2531 if (rp == NULL) 2532 return; 2533 2534 if (Arguments::created_by_gamma_launcher()) { 2535 // Support for the gamma launcher. Typical value for buf is 2536 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2537 // the right place in the string, then assume we are installed in a JDK and 2538 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2539 // up the path so it looks like libjvm.so is installed there (append a 2540 // fake suffix hotspot/libjvm.so). 2541 const char *p = buf + strlen(buf) - 1; 2542 for (int count = 0; p > buf && count < 5; ++count) { 2543 for (--p; p > buf && *p != '/'; --p) 2544 /* empty */ ; 2545 } 2546 2547 if (strncmp(p, "/jre/lib/", 9) != 0) { 2548 // Look for JAVA_HOME in the environment. 2549 char* java_home_var = ::getenv("JAVA_HOME"); 2550 if (java_home_var != NULL && java_home_var[0] != 0) { 2551 char* jrelib_p; 2552 int len; 2553 2554 // Check the current module name "libjvm.so" or "libjvm_g.so". 2555 p = strrchr(buf, '/'); 2556 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2557 p = strstr(p, "_g") ? "_g" : ""; 2558 2559 rp = realpath(java_home_var, buf); 2560 if (rp == NULL) 2561 return; 2562 2563 // determine if this is a legacy image or modules image 2564 // modules image doesn't have "jre" subdirectory 2565 len = strlen(buf); 2566 jrelib_p = buf + len; 2567 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2568 if (0 != access(buf, F_OK)) { 2569 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2570 } 2571 2572 if (0 == access(buf, F_OK)) { 2573 // Use current module name "libjvm[_g].so" instead of 2574 // "libjvm"debug_only("_g")".so" since for fastdebug version 2575 // we should have "libjvm.so" but debug_only("_g") adds "_g"! 2576 len = strlen(buf); 2577 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p); 2578 } else { 2579 // Go back to path of .so 2580 rp = realpath(dli_fname, buf); 2581 if (rp == NULL) 2582 return; 2583 } 2584 } 2585 } 2586 } 2587 2588 strcpy(saved_jvm_path, buf); 2589 } 2590 2591 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2592 // no prefix required, not even "_" 2593 } 2594 2595 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2596 // no suffix required 2597 } 2598 2599 //////////////////////////////////////////////////////////////////////////////// 2600 // sun.misc.Signal support 2601 2602 static volatile jint sigint_count = 0; 2603 2604 static void 2605 UserHandler(int sig, void *siginfo, void *context) { 2606 // 4511530 - sem_post is serialized and handled by the manager thread. When 2607 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 2608 // don't want to flood the manager thread with sem_post requests. 2609 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 2610 return; 2611 2612 // Ctrl-C is pressed during error reporting, likely because the error 2613 // handler fails to abort. Let VM die immediately. 2614 if (sig == SIGINT && is_error_reported()) { 2615 os::die(); 2616 } 2617 2618 os::signal_notify(sig); 2619 } 2620 2621 void* os::user_handler() { 2622 return CAST_FROM_FN_PTR(void*, UserHandler); 2623 } 2624 2625 extern "C" { 2626 typedef void (*sa_handler_t)(int); 2627 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2628 } 2629 2630 void* os::signal(int signal_number, void* handler) { 2631 struct sigaction sigAct, oldSigAct; 2632 2633 sigfillset(&(sigAct.sa_mask)); 2634 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 2635 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2636 2637 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2638 // -1 means registration failed 2639 return (void *)-1; 2640 } 2641 2642 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2643 } 2644 2645 void os::signal_raise(int signal_number) { 2646 ::raise(signal_number); 2647 } 2648 2649 /* 2650 * The following code is moved from os.cpp for making this 2651 * code platform specific, which it is by its very nature. 2652 */ 2653 2654 // Will be modified when max signal is changed to be dynamic 2655 int os::sigexitnum_pd() { 2656 return NSIG; 2657 } 2658 2659 // a counter for each possible signal value 2660 static volatile jint pending_signals[NSIG+1] = { 0 }; 2661 2662 // Bsd(POSIX) specific hand shaking semaphore. 2663 #ifdef __APPLE__ 2664 static semaphore_t sig_sem; 2665 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 2666 #define SEM_WAIT(sem) semaphore_wait(sem); 2667 #define SEM_POST(sem) semaphore_signal(sem); 2668 #else 2669 static sem_t sig_sem; 2670 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) 2671 #define SEM_WAIT(sem) sem_wait(&sem); 2672 #define SEM_POST(sem) sem_post(&sem); 2673 #endif 2674 2675 void os::signal_init_pd() { 2676 // Initialize signal structures 2677 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2678 2679 // Initialize signal semaphore 2680 ::SEM_INIT(sig_sem, 0); 2681 } 2682 2683 void os::signal_notify(int sig) { 2684 Atomic::inc(&pending_signals[sig]); 2685 ::SEM_POST(sig_sem); 2686 } 2687 2688 static int check_pending_signals(bool wait) { 2689 Atomic::store(0, &sigint_count); 2690 for (;;) { 2691 for (int i = 0; i < NSIG + 1; i++) { 2692 jint n = pending_signals[i]; 2693 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2694 return i; 2695 } 2696 } 2697 if (!wait) { 2698 return -1; 2699 } 2700 JavaThread *thread = JavaThread::current(); 2701 ThreadBlockInVM tbivm(thread); 2702 2703 bool threadIsSuspended; 2704 do { 2705 thread->set_suspend_equivalent(); 2706 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2707 ::SEM_WAIT(sig_sem); 2708 2709 // were we externally suspended while we were waiting? 2710 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2711 if (threadIsSuspended) { 2712 // 2713 // The semaphore has been incremented, but while we were waiting 2714 // another thread suspended us. We don't want to continue running 2715 // while suspended because that would surprise the thread that 2716 // suspended us. 2717 // 2718 ::SEM_POST(sig_sem); 2719 2720 thread->java_suspend_self(); 2721 } 2722 } while (threadIsSuspended); 2723 } 2724 } 2725 2726 int os::signal_lookup() { 2727 return check_pending_signals(false); 2728 } 2729 2730 int os::signal_wait() { 2731 return check_pending_signals(true); 2732 } 2733 2734 //////////////////////////////////////////////////////////////////////////////// 2735 // Virtual Memory 2736 2737 int os::vm_page_size() { 2738 // Seems redundant as all get out 2739 assert(os::Bsd::page_size() != -1, "must call os::init"); 2740 return os::Bsd::page_size(); 2741 } 2742 2743 // Solaris allocates memory by pages. 2744 int os::vm_allocation_granularity() { 2745 assert(os::Bsd::page_size() != -1, "must call os::init"); 2746 return os::Bsd::page_size(); 2747 } 2748 2749 // Rationale behind this function: 2750 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2751 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2752 // samples for JITted code. Here we create private executable mapping over the code cache 2753 // and then we can use standard (well, almost, as mapping can change) way to provide 2754 // info for the reporting script by storing timestamp and location of symbol 2755 void bsd_wrap_code(char* base, size_t size) { 2756 static volatile jint cnt = 0; 2757 2758 if (!UseOprofile) { 2759 return; 2760 } 2761 2762 char buf[PATH_MAX + 1]; 2763 int num = Atomic::add(1, &cnt); 2764 2765 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2766 os::get_temp_directory(), os::current_process_id(), num); 2767 unlink(buf); 2768 2769 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2770 2771 if (fd != -1) { 2772 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2773 if (rv != (off_t)-1) { 2774 if (::write(fd, "", 1) == 1) { 2775 mmap(base, size, 2776 PROT_READ|PROT_WRITE|PROT_EXEC, 2777 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2778 } 2779 } 2780 ::close(fd); 2781 unlink(buf); 2782 } 2783 } 2784 2785 // NOTE: Bsd kernel does not really reserve the pages for us. 2786 // All it does is to check if there are enough free pages 2787 // left at the time of mmap(). This could be a potential 2788 // problem. 2789 bool os::commit_memory(char* addr, size_t size, bool exec) { 2790 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2791 #ifdef __OpenBSD__ 2792 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2793 return ::mprotect(addr, size, prot) == 0; 2794 #else 2795 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2796 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2797 return res != (uintptr_t) MAP_FAILED; 2798 #endif 2799 } 2800 2801 #ifndef _ALLBSD_SOURCE 2802 // Define MAP_HUGETLB here so we can build HotSpot on old systems. 2803 #ifndef MAP_HUGETLB 2804 #define MAP_HUGETLB 0x40000 2805 #endif 2806 2807 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. 2808 #ifndef MADV_HUGEPAGE 2809 #define MADV_HUGEPAGE 14 2810 #endif 2811 #endif 2812 2813 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 2814 bool exec) { 2815 #ifndef _ALLBSD_SOURCE 2816 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { 2817 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2818 uintptr_t res = 2819 (uintptr_t) ::mmap(addr, size, prot, 2820 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, 2821 -1, 0); 2822 return res != (uintptr_t) MAP_FAILED; 2823 } 2824 #endif 2825 2826 return commit_memory(addr, size, exec); 2827 } 2828 2829 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2830 #ifndef _ALLBSD_SOURCE 2831 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { 2832 // We don't check the return value: madvise(MADV_HUGEPAGE) may not 2833 // be supported or the memory may already be backed by huge pages. 2834 ::madvise(addr, bytes, MADV_HUGEPAGE); 2835 } 2836 #endif 2837 } 2838 2839 void os::free_memory(char *addr, size_t bytes) { 2840 ::madvise(addr, bytes, MADV_DONTNEED); 2841 } 2842 2843 void os::numa_make_global(char *addr, size_t bytes) { 2844 } 2845 2846 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2847 } 2848 2849 bool os::numa_topology_changed() { return false; } 2850 2851 size_t os::numa_get_groups_num() { 2852 return 1; 2853 } 2854 2855 int os::numa_get_group_id() { 2856 return 0; 2857 } 2858 2859 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2860 if (size > 0) { 2861 ids[0] = 0; 2862 return 1; 2863 } 2864 return 0; 2865 } 2866 2867 bool os::get_page_info(char *start, page_info* info) { 2868 return false; 2869 } 2870 2871 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2872 return end; 2873 } 2874 2875 #ifndef _ALLBSD_SOURCE 2876 // Something to do with the numa-aware allocator needs these symbols 2877 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } 2878 extern "C" JNIEXPORT void numa_error(char *where) { } 2879 extern "C" JNIEXPORT int fork1() { return fork(); } 2880 2881 2882 // If we are running with libnuma version > 2, then we should 2883 // be trying to use symbols with versions 1.1 2884 // If we are running with earlier version, which did not have symbol versions, 2885 // we should use the base version. 2886 void* os::Bsd::libnuma_dlsym(void* handle, const char *name) { 2887 void *f = dlvsym(handle, name, "libnuma_1.1"); 2888 if (f == NULL) { 2889 f = dlsym(handle, name); 2890 } 2891 return f; 2892 } 2893 2894 bool os::Bsd::libnuma_init() { 2895 // sched_getcpu() should be in libc. 2896 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, 2897 dlsym(RTLD_DEFAULT, "sched_getcpu"))); 2898 2899 if (sched_getcpu() != -1) { // Does it work? 2900 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); 2901 if (handle != NULL) { 2902 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, 2903 libnuma_dlsym(handle, "numa_node_to_cpus"))); 2904 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, 2905 libnuma_dlsym(handle, "numa_max_node"))); 2906 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, 2907 libnuma_dlsym(handle, "numa_available"))); 2908 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, 2909 libnuma_dlsym(handle, "numa_tonode_memory"))); 2910 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, 2911 libnuma_dlsym(handle, "numa_interleave_memory"))); 2912 2913 2914 if (numa_available() != -1) { 2915 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); 2916 // Create a cpu -> node mapping 2917 _cpu_to_node = new (ResourceObj::C_HEAP) GrowableArray<int>(0, true); 2918 rebuild_cpu_to_node_map(); 2919 return true; 2920 } 2921 } 2922 } 2923 return false; 2924 } 2925 2926 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. 2927 // The table is later used in get_node_by_cpu(). 2928 void os::Bsd::rebuild_cpu_to_node_map() { 2929 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure 2930 // in libnuma (possible values are starting from 16, 2931 // and continuing up with every other power of 2, but less 2932 // than the maximum number of CPUs supported by kernel), and 2933 // is a subject to change (in libnuma version 2 the requirements 2934 // are more reasonable) we'll just hardcode the number they use 2935 // in the library. 2936 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; 2937 2938 size_t cpu_num = os::active_processor_count(); 2939 size_t cpu_map_size = NCPUS / BitsPerCLong; 2940 size_t cpu_map_valid_size = 2941 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); 2942 2943 cpu_to_node()->clear(); 2944 cpu_to_node()->at_grow(cpu_num - 1); 2945 size_t node_num = numa_get_groups_num(); 2946 2947 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size); 2948 for (size_t i = 0; i < node_num; i++) { 2949 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { 2950 for (size_t j = 0; j < cpu_map_valid_size; j++) { 2951 if (cpu_map[j] != 0) { 2952 for (size_t k = 0; k < BitsPerCLong; k++) { 2953 if (cpu_map[j] & (1UL << k)) { 2954 cpu_to_node()->at_put(j * BitsPerCLong + k, i); 2955 } 2956 } 2957 } 2958 } 2959 } 2960 } 2961 FREE_C_HEAP_ARRAY(unsigned long, cpu_map); 2962 } 2963 2964 int os::Bsd::get_node_by_cpu(int cpu_id) { 2965 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { 2966 return cpu_to_node()->at(cpu_id); 2967 } 2968 return -1; 2969 } 2970 2971 GrowableArray<int>* os::Bsd::_cpu_to_node; 2972 os::Bsd::sched_getcpu_func_t os::Bsd::_sched_getcpu; 2973 os::Bsd::numa_node_to_cpus_func_t os::Bsd::_numa_node_to_cpus; 2974 os::Bsd::numa_max_node_func_t os::Bsd::_numa_max_node; 2975 os::Bsd::numa_available_func_t os::Bsd::_numa_available; 2976 os::Bsd::numa_tonode_memory_func_t os::Bsd::_numa_tonode_memory; 2977 os::Bsd::numa_interleave_memory_func_t os::Bsd::_numa_interleave_memory; 2978 unsigned long* os::Bsd::_numa_all_nodes; 2979 #endif 2980 2981 bool os::uncommit_memory(char* addr, size_t size) { 2982 #ifdef __OpenBSD__ 2983 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2984 return ::mprotect(addr, size, PROT_NONE) == 0; 2985 #else 2986 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2987 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2988 return res != (uintptr_t) MAP_FAILED; 2989 #endif 2990 } 2991 2992 bool os::create_stack_guard_pages(char* addr, size_t size) { 2993 return os::commit_memory(addr, size); 2994 } 2995 2996 // If this is a growable mapping, remove the guard pages entirely by 2997 // munmap()ping them. If not, just call uncommit_memory(). 2998 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2999 return os::uncommit_memory(addr, size); 3000 } 3001 3002 static address _highest_vm_reserved_address = NULL; 3003 3004 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 3005 // at 'requested_addr'. If there are existing memory mappings at the same 3006 // location, however, they will be overwritten. If 'fixed' is false, 3007 // 'requested_addr' is only treated as a hint, the return value may or 3008 // may not start from the requested address. Unlike Bsd mmap(), this 3009 // function returns NULL to indicate failure. 3010 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 3011 char * addr; 3012 int flags; 3013 3014 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 3015 if (fixed) { 3016 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 3017 flags |= MAP_FIXED; 3018 } 3019 3020 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 3021 // to PROT_EXEC if executable when we commit the page. 3022 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 3023 flags, -1, 0); 3024 3025 if (addr != MAP_FAILED) { 3026 // anon_mmap() should only get called during VM initialization, 3027 // don't need lock (actually we can skip locking even it can be called 3028 // from multiple threads, because _highest_vm_reserved_address is just a 3029 // hint about the upper limit of non-stack memory regions.) 3030 if ((address)addr + bytes > _highest_vm_reserved_address) { 3031 _highest_vm_reserved_address = (address)addr + bytes; 3032 } 3033 } 3034 3035 return addr == MAP_FAILED ? NULL : addr; 3036 } 3037 3038 // Don't update _highest_vm_reserved_address, because there might be memory 3039 // regions above addr + size. If so, releasing a memory region only creates 3040 // a hole in the address space, it doesn't help prevent heap-stack collision. 3041 // 3042 static int anon_munmap(char * addr, size_t size) { 3043 return ::munmap(addr, size) == 0; 3044 } 3045 3046 char* os::reserve_memory(size_t bytes, char* requested_addr, 3047 size_t alignment_hint) { 3048 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 3049 } 3050 3051 bool os::release_memory(char* addr, size_t size) { 3052 return anon_munmap(addr, size); 3053 } 3054 3055 static address highest_vm_reserved_address() { 3056 return _highest_vm_reserved_address; 3057 } 3058 3059 static bool bsd_mprotect(char* addr, size_t size, int prot) { 3060 // Bsd wants the mprotect address argument to be page aligned. 3061 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 3062 3063 // According to SUSv3, mprotect() should only be used with mappings 3064 // established by mmap(), and mmap() always maps whole pages. Unaligned 3065 // 'addr' likely indicates problem in the VM (e.g. trying to change 3066 // protection of malloc'ed or statically allocated memory). Check the 3067 // caller if you hit this assert. 3068 assert(addr == bottom, "sanity check"); 3069 3070 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 3071 return ::mprotect(bottom, size, prot) == 0; 3072 } 3073 3074 // Set protections specified 3075 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3076 bool is_committed) { 3077 unsigned int p = 0; 3078 switch (prot) { 3079 case MEM_PROT_NONE: p = PROT_NONE; break; 3080 case MEM_PROT_READ: p = PROT_READ; break; 3081 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3082 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3083 default: 3084 ShouldNotReachHere(); 3085 } 3086 // is_committed is unused. 3087 return bsd_mprotect(addr, bytes, p); 3088 } 3089 3090 bool os::guard_memory(char* addr, size_t size) { 3091 return bsd_mprotect(addr, size, PROT_NONE); 3092 } 3093 3094 bool os::unguard_memory(char* addr, size_t size) { 3095 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 3096 } 3097 3098 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 3099 bool result = false; 3100 #ifndef _ALLBSD_SOURCE 3101 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, 3102 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, 3103 -1, 0); 3104 3105 if (p != (void *) -1) { 3106 // We don't know if this really is a huge page or not. 3107 FILE *fp = fopen("/proc/self/maps", "r"); 3108 if (fp) { 3109 while (!feof(fp)) { 3110 char chars[257]; 3111 long x = 0; 3112 if (fgets(chars, sizeof(chars), fp)) { 3113 if (sscanf(chars, "%lx-%*x", &x) == 1 3114 && x == (long)p) { 3115 if (strstr (chars, "hugepage")) { 3116 result = true; 3117 break; 3118 } 3119 } 3120 } 3121 } 3122 fclose(fp); 3123 } 3124 munmap (p, page_size); 3125 if (result) 3126 return true; 3127 } 3128 3129 if (warn) { 3130 warning("HugeTLBFS is not supported by the operating system."); 3131 } 3132 #endif 3133 3134 return result; 3135 } 3136 3137 /* 3138 * Set the coredump_filter bits to include largepages in core dump (bit 6) 3139 * 3140 * From the coredump_filter documentation: 3141 * 3142 * - (bit 0) anonymous private memory 3143 * - (bit 1) anonymous shared memory 3144 * - (bit 2) file-backed private memory 3145 * - (bit 3) file-backed shared memory 3146 * - (bit 4) ELF header pages in file-backed private memory areas (it is 3147 * effective only if the bit 2 is cleared) 3148 * - (bit 5) hugetlb private memory 3149 * - (bit 6) hugetlb shared memory 3150 */ 3151 static void set_coredump_filter(void) { 3152 FILE *f; 3153 long cdm; 3154 3155 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 3156 return; 3157 } 3158 3159 if (fscanf(f, "%lx", &cdm) != 1) { 3160 fclose(f); 3161 return; 3162 } 3163 3164 rewind(f); 3165 3166 if ((cdm & LARGEPAGES_BIT) == 0) { 3167 cdm |= LARGEPAGES_BIT; 3168 fprintf(f, "%#lx", cdm); 3169 } 3170 3171 fclose(f); 3172 } 3173 3174 // Large page support 3175 3176 static size_t _large_page_size = 0; 3177 3178 void os::large_page_init() { 3179 #ifndef _ALLBSD_SOURCE 3180 if (!UseLargePages) { 3181 UseHugeTLBFS = false; 3182 UseSHM = false; 3183 return; 3184 } 3185 3186 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { 3187 // If UseLargePages is specified on the command line try both methods, 3188 // if it's default, then try only HugeTLBFS. 3189 if (FLAG_IS_DEFAULT(UseLargePages)) { 3190 UseHugeTLBFS = true; 3191 } else { 3192 UseHugeTLBFS = UseSHM = true; 3193 } 3194 } 3195 3196 if (LargePageSizeInBytes) { 3197 _large_page_size = LargePageSizeInBytes; 3198 } else { 3199 // large_page_size on Bsd is used to round up heap size. x86 uses either 3200 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) 3201 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use 3202 // page as large as 256M. 3203 // 3204 // Here we try to figure out page size by parsing /proc/meminfo and looking 3205 // for a line with the following format: 3206 // Hugepagesize: 2048 kB 3207 // 3208 // If we can't determine the value (e.g. /proc is not mounted, or the text 3209 // format has been changed), we'll use the largest page size supported by 3210 // the processor. 3211 3212 #ifndef ZERO 3213 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) 3214 ARM_ONLY(2 * M) PPC_ONLY(4 * M); 3215 #endif // ZERO 3216 3217 FILE *fp = fopen("/proc/meminfo", "r"); 3218 if (fp) { 3219 while (!feof(fp)) { 3220 int x = 0; 3221 char buf[16]; 3222 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { 3223 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { 3224 _large_page_size = x * K; 3225 break; 3226 } 3227 } else { 3228 // skip to next line 3229 for (;;) { 3230 int ch = fgetc(fp); 3231 if (ch == EOF || ch == (int)'\n') break; 3232 } 3233 } 3234 } 3235 fclose(fp); 3236 } 3237 } 3238 3239 // print a warning if any large page related flag is specified on command line 3240 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); 3241 3242 const size_t default_page_size = (size_t)Bsd::page_size(); 3243 if (_large_page_size > default_page_size) { 3244 _page_sizes[0] = _large_page_size; 3245 _page_sizes[1] = default_page_size; 3246 _page_sizes[2] = 0; 3247 } 3248 UseHugeTLBFS = UseHugeTLBFS && 3249 Bsd::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); 3250 3251 if (UseHugeTLBFS) 3252 UseSHM = false; 3253 3254 UseLargePages = UseHugeTLBFS || UseSHM; 3255 3256 set_coredump_filter(); 3257 #endif 3258 } 3259 3260 #ifndef _ALLBSD_SOURCE 3261 #ifndef SHM_HUGETLB 3262 #define SHM_HUGETLB 04000 3263 #endif 3264 #endif 3265 3266 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 3267 // "exec" is passed in but not used. Creating the shared image for 3268 // the code cache doesn't have an SHM_X executable permission to check. 3269 assert(UseLargePages && UseSHM, "only for SHM large pages"); 3270 3271 key_t key = IPC_PRIVATE; 3272 char *addr; 3273 3274 bool warn_on_failure = UseLargePages && 3275 (!FLAG_IS_DEFAULT(UseLargePages) || 3276 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3277 ); 3278 char msg[128]; 3279 3280 // Create a large shared memory region to attach to based on size. 3281 // Currently, size is the total size of the heap 3282 #ifndef _ALLBSD_SOURCE 3283 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); 3284 #else 3285 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 3286 #endif 3287 if (shmid == -1) { 3288 // Possible reasons for shmget failure: 3289 // 1. shmmax is too small for Java heap. 3290 // > check shmmax value: cat /proc/sys/kernel/shmmax 3291 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 3292 // 2. not enough large page memory. 3293 // > check available large pages: cat /proc/meminfo 3294 // > increase amount of large pages: 3295 // echo new_value > /proc/sys/vm/nr_hugepages 3296 // Note 1: different Bsd may use different name for this property, 3297 // e.g. on Redhat AS-3 it is "hugetlb_pool". 3298 // Note 2: it's possible there's enough physical memory available but 3299 // they are so fragmented after a long run that they can't 3300 // coalesce into large pages. Try to reserve large pages when 3301 // the system is still "fresh". 3302 if (warn_on_failure) { 3303 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3304 warning(msg); 3305 } 3306 return NULL; 3307 } 3308 3309 // attach to the region 3310 addr = (char*)shmat(shmid, req_addr, 0); 3311 int err = errno; 3312 3313 // Remove shmid. If shmat() is successful, the actual shared memory segment 3314 // will be deleted when it's detached by shmdt() or when the process 3315 // terminates. If shmat() is not successful this will remove the shared 3316 // segment immediately. 3317 shmctl(shmid, IPC_RMID, NULL); 3318 3319 if ((intptr_t)addr == -1) { 3320 if (warn_on_failure) { 3321 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3322 warning(msg); 3323 } 3324 return NULL; 3325 } 3326 3327 return addr; 3328 } 3329 3330 bool os::release_memory_special(char* base, size_t bytes) { 3331 // detaching the SHM segment will also delete it, see reserve_memory_special() 3332 int rslt = shmdt(base); 3333 return rslt == 0; 3334 } 3335 3336 size_t os::large_page_size() { 3337 return _large_page_size; 3338 } 3339 3340 // HugeTLBFS allows application to commit large page memory on demand; 3341 // with SysV SHM the entire memory region must be allocated as shared 3342 // memory. 3343 bool os::can_commit_large_page_memory() { 3344 return UseHugeTLBFS; 3345 } 3346 3347 bool os::can_execute_large_page_memory() { 3348 return UseHugeTLBFS; 3349 } 3350 3351 // Reserve memory at an arbitrary address, only if that area is 3352 // available (and not reserved for something else). 3353 3354 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3355 const int max_tries = 10; 3356 char* base[max_tries]; 3357 size_t size[max_tries]; 3358 const size_t gap = 0x000000; 3359 3360 // Assert only that the size is a multiple of the page size, since 3361 // that's all that mmap requires, and since that's all we really know 3362 // about at this low abstraction level. If we need higher alignment, 3363 // we can either pass an alignment to this method or verify alignment 3364 // in one of the methods further up the call chain. See bug 5044738. 3365 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3366 3367 // Repeatedly allocate blocks until the block is allocated at the 3368 // right spot. Give up after max_tries. Note that reserve_memory() will 3369 // automatically update _highest_vm_reserved_address if the call is 3370 // successful. The variable tracks the highest memory address every reserved 3371 // by JVM. It is used to detect heap-stack collision if running with 3372 // fixed-stack BsdThreads. Because here we may attempt to reserve more 3373 // space than needed, it could confuse the collision detecting code. To 3374 // solve the problem, save current _highest_vm_reserved_address and 3375 // calculate the correct value before return. 3376 address old_highest = _highest_vm_reserved_address; 3377 3378 // Bsd mmap allows caller to pass an address as hint; give it a try first, 3379 // if kernel honors the hint then we can return immediately. 3380 char * addr = anon_mmap(requested_addr, bytes, false); 3381 if (addr == requested_addr) { 3382 return requested_addr; 3383 } 3384 3385 if (addr != NULL) { 3386 // mmap() is successful but it fails to reserve at the requested address 3387 anon_munmap(addr, bytes); 3388 } 3389 3390 int i; 3391 for (i = 0; i < max_tries; ++i) { 3392 base[i] = reserve_memory(bytes); 3393 3394 if (base[i] != NULL) { 3395 // Is this the block we wanted? 3396 if (base[i] == requested_addr) { 3397 size[i] = bytes; 3398 break; 3399 } 3400 3401 // Does this overlap the block we wanted? Give back the overlapped 3402 // parts and try again. 3403 3404 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3405 if (top_overlap >= 0 && top_overlap < bytes) { 3406 unmap_memory(base[i], top_overlap); 3407 base[i] += top_overlap; 3408 size[i] = bytes - top_overlap; 3409 } else { 3410 size_t bottom_overlap = base[i] + bytes - requested_addr; 3411 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3412 unmap_memory(requested_addr, bottom_overlap); 3413 size[i] = bytes - bottom_overlap; 3414 } else { 3415 size[i] = bytes; 3416 } 3417 } 3418 } 3419 } 3420 3421 // Give back the unused reserved pieces. 3422 3423 for (int j = 0; j < i; ++j) { 3424 if (base[j] != NULL) { 3425 unmap_memory(base[j], size[j]); 3426 } 3427 } 3428 3429 if (i < max_tries) { 3430 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 3431 return requested_addr; 3432 } else { 3433 _highest_vm_reserved_address = old_highest; 3434 return NULL; 3435 } 3436 } 3437 3438 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3439 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 3440 } 3441 3442 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 3443 // Solaris uses poll(), bsd uses park(). 3444 // Poll() is likely a better choice, assuming that Thread.interrupt() 3445 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 3446 // SIGSEGV, see 4355769. 3447 3448 const int NANOSECS_PER_MILLISECS = 1000000; 3449 3450 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3451 assert(thread == Thread::current(), "thread consistency check"); 3452 3453 ParkEvent * const slp = thread->_SleepEvent ; 3454 slp->reset() ; 3455 OrderAccess::fence() ; 3456 3457 if (interruptible) { 3458 jlong prevtime = javaTimeNanos(); 3459 3460 for (;;) { 3461 if (os::is_interrupted(thread, true)) { 3462 return OS_INTRPT; 3463 } 3464 3465 jlong newtime = javaTimeNanos(); 3466 3467 if (newtime - prevtime < 0) { 3468 // time moving backwards, should only happen if no monotonic clock 3469 // not a guarantee() because JVM should not abort on kernel/glibc bugs 3470 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 3471 } else { 3472 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; 3473 } 3474 3475 if(millis <= 0) { 3476 return OS_OK; 3477 } 3478 3479 prevtime = newtime; 3480 3481 { 3482 assert(thread->is_Java_thread(), "sanity check"); 3483 JavaThread *jt = (JavaThread *) thread; 3484 ThreadBlockInVM tbivm(jt); 3485 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3486 3487 jt->set_suspend_equivalent(); 3488 // cleared by handle_special_suspend_equivalent_condition() or 3489 // java_suspend_self() via check_and_wait_while_suspended() 3490 3491 slp->park(millis); 3492 3493 // were we externally suspended while we were waiting? 3494 jt->check_and_wait_while_suspended(); 3495 } 3496 } 3497 } else { 3498 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3499 jlong prevtime = javaTimeNanos(); 3500 3501 for (;;) { 3502 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 3503 // the 1st iteration ... 3504 jlong newtime = javaTimeNanos(); 3505 3506 if (newtime - prevtime < 0) { 3507 // time moving backwards, should only happen if no monotonic clock 3508 // not a guarantee() because JVM should not abort on kernel/glibc bugs 3509 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 3510 } else { 3511 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; 3512 } 3513 3514 if(millis <= 0) break ; 3515 3516 prevtime = newtime; 3517 slp->park(millis); 3518 } 3519 return OS_OK ; 3520 } 3521 } 3522 3523 int os::naked_sleep() { 3524 // %% make the sleep time an integer flag. for now use 1 millisec. 3525 return os::sleep(Thread::current(), 1, false); 3526 } 3527 3528 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3529 void os::infinite_sleep() { 3530 while (true) { // sleep forever ... 3531 ::sleep(100); // ... 100 seconds at a time 3532 } 3533 } 3534 3535 // Used to convert frequent JVM_Yield() to nops 3536 bool os::dont_yield() { 3537 return DontYieldALot; 3538 } 3539 3540 void os::yield() { 3541 sched_yield(); 3542 } 3543 3544 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 3545 3546 void os::yield_all(int attempts) { 3547 // Yields to all threads, including threads with lower priorities 3548 // Threads on Bsd are all with same priority. The Solaris style 3549 // os::yield_all() with nanosleep(1ms) is not necessary. 3550 sched_yield(); 3551 } 3552 3553 // Called from the tight loops to possibly influence time-sharing heuristics 3554 void os::loop_breaker(int attempts) { 3555 os::yield_all(attempts); 3556 } 3557 3558 //////////////////////////////////////////////////////////////////////////////// 3559 // thread priority support 3560 3561 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 3562 // only supports dynamic priority, static priority must be zero. For real-time 3563 // applications, Bsd supports SCHED_RR which allows static priority (1-99). 3564 // However, for large multi-threaded applications, SCHED_RR is not only slower 3565 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 3566 // of 5 runs - Sep 2005). 3567 // 3568 // The following code actually changes the niceness of kernel-thread/LWP. It 3569 // has an assumption that setpriority() only modifies one kernel-thread/LWP, 3570 // not the entire user process, and user level threads are 1:1 mapped to kernel 3571 // threads. It has always been the case, but could change in the future. For 3572 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). 3573 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. 3574 3575 #if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) 3576 int os::java_to_os_priority[MaxPriority + 1] = { 3577 19, // 0 Entry should never be used 3578 3579 0, // 1 MinPriority 3580 3, // 2 3581 6, // 3 3582 3583 10, // 4 3584 15, // 5 NormPriority 3585 18, // 6 3586 3587 21, // 7 3588 25, // 8 3589 28, // 9 NearMaxPriority 3590 3591 31 // 10 MaxPriority 3592 }; 3593 #elif defined(__APPLE__) 3594 /* Using Mach high-level priority assignments */ 3595 int os::java_to_os_priority[MaxPriority + 1] = { 3596 0, // 0 Entry should never be used (MINPRI_USER) 3597 3598 27, // 1 MinPriority 3599 28, // 2 3600 29, // 3 3601 3602 30, // 4 3603 31, // 5 NormPriority (BASEPRI_DEFAULT) 3604 32, // 6 3605 3606 33, // 7 3607 34, // 8 3608 35, // 9 NearMaxPriority 3609 3610 36 // 10 MaxPriority 3611 }; 3612 #else 3613 int os::java_to_os_priority[MaxPriority + 1] = { 3614 19, // 0 Entry should never be used 3615 3616 4, // 1 MinPriority 3617 3, // 2 3618 2, // 3 3619 3620 1, // 4 3621 0, // 5 NormPriority 3622 -1, // 6 3623 3624 -2, // 7 3625 -3, // 8 3626 -4, // 9 NearMaxPriority 3627 3628 -5 // 10 MaxPriority 3629 }; 3630 #endif 3631 3632 static int prio_init() { 3633 if (ThreadPriorityPolicy == 1) { 3634 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 3635 // if effective uid is not root. Perhaps, a more elegant way of doing 3636 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 3637 if (geteuid() != 0) { 3638 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 3639 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 3640 } 3641 ThreadPriorityPolicy = 0; 3642 } 3643 } 3644 return 0; 3645 } 3646 3647 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3648 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 3649 3650 #ifdef __OpenBSD__ 3651 // OpenBSD pthread_setprio starves low priority threads 3652 return OS_OK; 3653 #elif defined(__FreeBSD__) 3654 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 3655 #elif defined(__APPLE__) || defined(__NetBSD__) 3656 struct sched_param sp; 3657 int policy; 3658 pthread_t self = pthread_self(); 3659 3660 if (pthread_getschedparam(self, &policy, &sp) != 0) 3661 return OS_ERR; 3662 3663 sp.sched_priority = newpri; 3664 if (pthread_setschedparam(self, policy, &sp) != 0) 3665 return OS_ERR; 3666 3667 return OS_OK; 3668 #else 3669 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 3670 return (ret == 0) ? OS_OK : OS_ERR; 3671 #endif 3672 } 3673 3674 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 3675 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 3676 *priority_ptr = java_to_os_priority[NormPriority]; 3677 return OS_OK; 3678 } 3679 3680 errno = 0; 3681 #if defined(__OpenBSD__) || defined(__FreeBSD__) 3682 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 3683 #elif defined(__APPLE__) || defined(__NetBSD__) 3684 int policy; 3685 struct sched_param sp; 3686 3687 pthread_getschedparam(pthread_self(), &policy, &sp); 3688 *priority_ptr = sp.sched_priority; 3689 #else 3690 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 3691 #endif 3692 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 3693 } 3694 3695 // Hint to the underlying OS that a task switch would not be good. 3696 // Void return because it's a hint and can fail. 3697 void os::hint_no_preempt() {} 3698 3699 //////////////////////////////////////////////////////////////////////////////// 3700 // suspend/resume support 3701 3702 // the low-level signal-based suspend/resume support is a remnant from the 3703 // old VM-suspension that used to be for java-suspension, safepoints etc, 3704 // within hotspot. Now there is a single use-case for this: 3705 // - calling get_thread_pc() on the VMThread by the flat-profiler task 3706 // that runs in the watcher thread. 3707 // The remaining code is greatly simplified from the more general suspension 3708 // code that used to be used. 3709 // 3710 // The protocol is quite simple: 3711 // - suspend: 3712 // - sends a signal to the target thread 3713 // - polls the suspend state of the osthread using a yield loop 3714 // - target thread signal handler (SR_handler) sets suspend state 3715 // and blocks in sigsuspend until continued 3716 // - resume: 3717 // - sets target osthread state to continue 3718 // - sends signal to end the sigsuspend loop in the SR_handler 3719 // 3720 // Note that the SR_lock plays no role in this suspend/resume protocol. 3721 // 3722 3723 static void resume_clear_context(OSThread *osthread) { 3724 osthread->set_ucontext(NULL); 3725 osthread->set_siginfo(NULL); 3726 3727 // notify the suspend action is completed, we have now resumed 3728 osthread->sr.clear_suspended(); 3729 } 3730 3731 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 3732 osthread->set_ucontext(context); 3733 osthread->set_siginfo(siginfo); 3734 } 3735 3736 // 3737 // Handler function invoked when a thread's execution is suspended or 3738 // resumed. We have to be careful that only async-safe functions are 3739 // called here (Note: most pthread functions are not async safe and 3740 // should be avoided.) 3741 // 3742 // Note: sigwait() is a more natural fit than sigsuspend() from an 3743 // interface point of view, but sigwait() prevents the signal hander 3744 // from being run. libpthread would get very confused by not having 3745 // its signal handlers run and prevents sigwait()'s use with the 3746 // mutex granting granting signal. 3747 // 3748 // Currently only ever called on the VMThread 3749 // 3750 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 3751 // Save and restore errno to avoid confusing native code with EINTR 3752 // after sigsuspend. 3753 int old_errno = errno; 3754 3755 Thread* thread = Thread::current(); 3756 OSThread* osthread = thread->osthread(); 3757 assert(thread->is_VM_thread(), "Must be VMThread"); 3758 // read current suspend action 3759 int action = osthread->sr.suspend_action(); 3760 if (action == SR_SUSPEND) { 3761 suspend_save_context(osthread, siginfo, context); 3762 3763 // Notify the suspend action is about to be completed. do_suspend() 3764 // waits until SR_SUSPENDED is set and then returns. We will wait 3765 // here for a resume signal and that completes the suspend-other 3766 // action. do_suspend/do_resume is always called as a pair from 3767 // the same thread - so there are no races 3768 3769 // notify the caller 3770 osthread->sr.set_suspended(); 3771 3772 sigset_t suspend_set; // signals for sigsuspend() 3773 3774 // get current set of blocked signals and unblock resume signal 3775 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3776 sigdelset(&suspend_set, SR_signum); 3777 3778 // wait here until we are resumed 3779 do { 3780 sigsuspend(&suspend_set); 3781 // ignore all returns until we get a resume signal 3782 } while (osthread->sr.suspend_action() != SR_CONTINUE); 3783 3784 resume_clear_context(osthread); 3785 3786 } else { 3787 assert(action == SR_CONTINUE, "unexpected sr action"); 3788 // nothing special to do - just leave the handler 3789 } 3790 3791 errno = old_errno; 3792 } 3793 3794 3795 static int SR_initialize() { 3796 struct sigaction act; 3797 char *s; 3798 /* Get signal number to use for suspend/resume */ 3799 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 3800 int sig = ::strtol(s, 0, 10); 3801 if (sig > 0 || sig < NSIG) { 3802 SR_signum = sig; 3803 } 3804 } 3805 3806 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 3807 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 3808 3809 sigemptyset(&SR_sigset); 3810 sigaddset(&SR_sigset, SR_signum); 3811 3812 /* Set up signal handler for suspend/resume */ 3813 act.sa_flags = SA_RESTART|SA_SIGINFO; 3814 act.sa_handler = (void (*)(int)) SR_handler; 3815 3816 // SR_signum is blocked by default. 3817 // 4528190 - We also need to block pthread restart signal (32 on all 3818 // supported Bsd platforms). Note that BsdThreads need to block 3819 // this signal for all threads to work properly. So we don't have 3820 // to use hard-coded signal number when setting up the mask. 3821 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 3822 3823 if (sigaction(SR_signum, &act, 0) == -1) { 3824 return -1; 3825 } 3826 3827 // Save signal flag 3828 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 3829 return 0; 3830 } 3831 3832 static int SR_finalize() { 3833 return 0; 3834 } 3835 3836 3837 // returns true on success and false on error - really an error is fatal 3838 // but this seems the normal response to library errors 3839 static bool do_suspend(OSThread* osthread) { 3840 // mark as suspended and send signal 3841 osthread->sr.set_suspend_action(SR_SUSPEND); 3842 int status = pthread_kill(osthread->pthread_id(), SR_signum); 3843 assert_status(status == 0, status, "pthread_kill"); 3844 3845 // check status and wait until notified of suspension 3846 if (status == 0) { 3847 for (int i = 0; !osthread->sr.is_suspended(); i++) { 3848 os::yield_all(i); 3849 } 3850 osthread->sr.set_suspend_action(SR_NONE); 3851 return true; 3852 } 3853 else { 3854 osthread->sr.set_suspend_action(SR_NONE); 3855 return false; 3856 } 3857 } 3858 3859 static void do_resume(OSThread* osthread) { 3860 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3861 osthread->sr.set_suspend_action(SR_CONTINUE); 3862 3863 int status = pthread_kill(osthread->pthread_id(), SR_signum); 3864 assert_status(status == 0, status, "pthread_kill"); 3865 // check status and wait unit notified of resumption 3866 if (status == 0) { 3867 for (int i = 0; osthread->sr.is_suspended(); i++) { 3868 os::yield_all(i); 3869 } 3870 } 3871 osthread->sr.set_suspend_action(SR_NONE); 3872 } 3873 3874 //////////////////////////////////////////////////////////////////////////////// 3875 // interrupt support 3876 3877 void os::interrupt(Thread* thread) { 3878 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3879 "possibility of dangling Thread pointer"); 3880 3881 OSThread* osthread = thread->osthread(); 3882 3883 if (!osthread->interrupted()) { 3884 osthread->set_interrupted(true); 3885 // More than one thread can get here with the same value of osthread, 3886 // resulting in multiple notifications. We do, however, want the store 3887 // to interrupted() to be visible to other threads before we execute unpark(). 3888 OrderAccess::fence(); 3889 ParkEvent * const slp = thread->_SleepEvent ; 3890 if (slp != NULL) slp->unpark() ; 3891 } 3892 3893 // For JSR166. Unpark even if interrupt status already was set 3894 if (thread->is_Java_thread()) 3895 ((JavaThread*)thread)->parker()->unpark(); 3896 3897 ParkEvent * ev = thread->_ParkEvent ; 3898 if (ev != NULL) ev->unpark() ; 3899 3900 } 3901 3902 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3903 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3904 "possibility of dangling Thread pointer"); 3905 3906 OSThread* osthread = thread->osthread(); 3907 3908 bool interrupted = osthread->interrupted(); 3909 3910 if (interrupted && clear_interrupted) { 3911 osthread->set_interrupted(false); 3912 // consider thread->_SleepEvent->reset() ... optional optimization 3913 } 3914 3915 return interrupted; 3916 } 3917 3918 /////////////////////////////////////////////////////////////////////////////////// 3919 // signal handling (except suspend/resume) 3920 3921 // This routine may be used by user applications as a "hook" to catch signals. 3922 // The user-defined signal handler must pass unrecognized signals to this 3923 // routine, and if it returns true (non-zero), then the signal handler must 3924 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3925 // routine will never retun false (zero), but instead will execute a VM panic 3926 // routine kill the process. 3927 // 3928 // If this routine returns false, it is OK to call it again. This allows 3929 // the user-defined signal handler to perform checks either before or after 3930 // the VM performs its own checks. Naturally, the user code would be making 3931 // a serious error if it tried to handle an exception (such as a null check 3932 // or breakpoint) that the VM was generating for its own correct operation. 3933 // 3934 // This routine may recognize any of the following kinds of signals: 3935 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 3936 // It should be consulted by handlers for any of those signals. 3937 // 3938 // The caller of this routine must pass in the three arguments supplied 3939 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3940 // field of the structure passed to sigaction(). This routine assumes that 3941 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3942 // 3943 // Note that the VM will print warnings if it detects conflicting signal 3944 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3945 // 3946 extern "C" JNIEXPORT int 3947 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 3948 void* ucontext, int abort_if_unrecognized); 3949 3950 void signalHandler(int sig, siginfo_t* info, void* uc) { 3951 assert(info != NULL && uc != NULL, "it must be old kernel"); 3952 JVM_handle_bsd_signal(sig, info, uc, true); 3953 } 3954 3955 3956 // This boolean allows users to forward their own non-matching signals 3957 // to JVM_handle_bsd_signal, harmlessly. 3958 bool os::Bsd::signal_handlers_are_installed = false; 3959 3960 // For signal-chaining 3961 struct sigaction os::Bsd::sigact[MAXSIGNUM]; 3962 unsigned int os::Bsd::sigs = 0; 3963 bool os::Bsd::libjsig_is_loaded = false; 3964 typedef struct sigaction *(*get_signal_t)(int); 3965 get_signal_t os::Bsd::get_signal_action = NULL; 3966 3967 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 3968 struct sigaction *actp = NULL; 3969 3970 if (libjsig_is_loaded) { 3971 // Retrieve the old signal handler from libjsig 3972 actp = (*get_signal_action)(sig); 3973 } 3974 if (actp == NULL) { 3975 // Retrieve the preinstalled signal handler from jvm 3976 actp = get_preinstalled_handler(sig); 3977 } 3978 3979 return actp; 3980 } 3981 3982 static bool call_chained_handler(struct sigaction *actp, int sig, 3983 siginfo_t *siginfo, void *context) { 3984 // Call the old signal handler 3985 if (actp->sa_handler == SIG_DFL) { 3986 // It's more reasonable to let jvm treat it as an unexpected exception 3987 // instead of taking the default action. 3988 return false; 3989 } else if (actp->sa_handler != SIG_IGN) { 3990 if ((actp->sa_flags & SA_NODEFER) == 0) { 3991 // automaticlly block the signal 3992 sigaddset(&(actp->sa_mask), sig); 3993 } 3994 3995 sa_handler_t hand; 3996 sa_sigaction_t sa; 3997 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3998 // retrieve the chained handler 3999 if (siginfo_flag_set) { 4000 sa = actp->sa_sigaction; 4001 } else { 4002 hand = actp->sa_handler; 4003 } 4004 4005 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4006 actp->sa_handler = SIG_DFL; 4007 } 4008 4009 // try to honor the signal mask 4010 sigset_t oset; 4011 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4012 4013 // call into the chained handler 4014 if (siginfo_flag_set) { 4015 (*sa)(sig, siginfo, context); 4016 } else { 4017 (*hand)(sig); 4018 } 4019 4020 // restore the signal mask 4021 pthread_sigmask(SIG_SETMASK, &oset, 0); 4022 } 4023 // Tell jvm's signal handler the signal is taken care of. 4024 return true; 4025 } 4026 4027 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4028 bool chained = false; 4029 // signal-chaining 4030 if (UseSignalChaining) { 4031 struct sigaction *actp = get_chained_signal_action(sig); 4032 if (actp != NULL) { 4033 chained = call_chained_handler(actp, sig, siginfo, context); 4034 } 4035 } 4036 return chained; 4037 } 4038 4039 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 4040 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 4041 return &sigact[sig]; 4042 } 4043 return NULL; 4044 } 4045 4046 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4047 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4048 sigact[sig] = oldAct; 4049 sigs |= (unsigned int)1 << sig; 4050 } 4051 4052 // for diagnostic 4053 int os::Bsd::sigflags[MAXSIGNUM]; 4054 4055 int os::Bsd::get_our_sigflags(int sig) { 4056 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4057 return sigflags[sig]; 4058 } 4059 4060 void os::Bsd::set_our_sigflags(int sig, int flags) { 4061 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4062 sigflags[sig] = flags; 4063 } 4064 4065 void os::Bsd::set_signal_handler(int sig, bool set_installed) { 4066 // Check for overwrite. 4067 struct sigaction oldAct; 4068 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4069 4070 void* oldhand = oldAct.sa_sigaction 4071 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4072 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4073 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4074 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4075 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 4076 if (AllowUserSignalHandlers || !set_installed) { 4077 // Do not overwrite; user takes responsibility to forward to us. 4078 return; 4079 } else if (UseSignalChaining) { 4080 // save the old handler in jvm 4081 save_preinstalled_handler(sig, oldAct); 4082 // libjsig also interposes the sigaction() call below and saves the 4083 // old sigaction on it own. 4084 } else { 4085 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4086 "%#lx for signal %d.", (long)oldhand, sig)); 4087 } 4088 } 4089 4090 struct sigaction sigAct; 4091 sigfillset(&(sigAct.sa_mask)); 4092 sigAct.sa_handler = SIG_DFL; 4093 if (!set_installed) { 4094 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 4095 } else { 4096 sigAct.sa_sigaction = signalHandler; 4097 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 4098 } 4099 // Save flags, which are set by ours 4100 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4101 sigflags[sig] = sigAct.sa_flags; 4102 4103 int ret = sigaction(sig, &sigAct, &oldAct); 4104 assert(ret == 0, "check"); 4105 4106 void* oldhand2 = oldAct.sa_sigaction 4107 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4108 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4109 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4110 } 4111 4112 // install signal handlers for signals that HotSpot needs to 4113 // handle in order to support Java-level exception handling. 4114 4115 void os::Bsd::install_signal_handlers() { 4116 if (!signal_handlers_are_installed) { 4117 signal_handlers_are_installed = true; 4118 4119 // signal-chaining 4120 typedef void (*signal_setting_t)(); 4121 signal_setting_t begin_signal_setting = NULL; 4122 signal_setting_t end_signal_setting = NULL; 4123 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4124 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4125 if (begin_signal_setting != NULL) { 4126 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4127 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4128 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4129 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4130 libjsig_is_loaded = true; 4131 assert(UseSignalChaining, "should enable signal-chaining"); 4132 } 4133 if (libjsig_is_loaded) { 4134 // Tell libjsig jvm is setting signal handlers 4135 (*begin_signal_setting)(); 4136 } 4137 4138 set_signal_handler(SIGSEGV, true); 4139 set_signal_handler(SIGPIPE, true); 4140 set_signal_handler(SIGBUS, true); 4141 set_signal_handler(SIGILL, true); 4142 set_signal_handler(SIGFPE, true); 4143 set_signal_handler(SIGXFSZ, true); 4144 4145 #if defined(__APPLE__) 4146 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 4147 // signals caught and handled by the JVM. To work around this, we reset the mach task 4148 // signal handler that's placed on our process by CrashReporter. This disables 4149 // CrashReporter-based reporting. 4150 // 4151 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 4152 // on caught fatal signals. 4153 // 4154 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 4155 // handlers. By replacing the existing task exception handler, we disable gdb's mach 4156 // exception handling, while leaving the standard BSD signal handlers functional. 4157 kern_return_t kr; 4158 kr = task_set_exception_ports(mach_task_self(), 4159 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 4160 MACH_PORT_NULL, 4161 EXCEPTION_STATE_IDENTITY, 4162 MACHINE_THREAD_STATE); 4163 4164 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 4165 #endif 4166 4167 if (libjsig_is_loaded) { 4168 // Tell libjsig jvm finishes setting signal handlers 4169 (*end_signal_setting)(); 4170 } 4171 4172 // We don't activate signal checker if libjsig is in place, we trust ourselves 4173 // and if UserSignalHandler is installed all bets are off 4174 if (CheckJNICalls) { 4175 if (libjsig_is_loaded) { 4176 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4177 check_signals = false; 4178 } 4179 if (AllowUserSignalHandlers) { 4180 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4181 check_signals = false; 4182 } 4183 } 4184 } 4185 } 4186 4187 #ifndef _ALLBSD_SOURCE 4188 // This is the fastest way to get thread cpu time on Bsd. 4189 // Returns cpu time (user+sys) for any thread, not only for current. 4190 // POSIX compliant clocks are implemented in the kernels 2.6.16+. 4191 // It might work on 2.6.10+ with a special kernel/glibc patch. 4192 // For reference, please, see IEEE Std 1003.1-2004: 4193 // http://www.unix.org/single_unix_specification 4194 4195 jlong os::Bsd::fast_thread_cpu_time(clockid_t clockid) { 4196 struct timespec tp; 4197 int rc = os::Bsd::clock_gettime(clockid, &tp); 4198 assert(rc == 0, "clock_gettime is expected to return 0 code"); 4199 4200 return (tp.tv_sec * SEC_IN_NANOSECS) + tp.tv_nsec; 4201 } 4202 #endif 4203 4204 ///// 4205 // glibc on Bsd platform uses non-documented flag 4206 // to indicate, that some special sort of signal 4207 // trampoline is used. 4208 // We will never set this flag, and we should 4209 // ignore this flag in our diagnostic 4210 #ifdef SIGNIFICANT_SIGNAL_MASK 4211 #undef SIGNIFICANT_SIGNAL_MASK 4212 #endif 4213 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 4214 4215 static const char* get_signal_handler_name(address handler, 4216 char* buf, int buflen) { 4217 int offset; 4218 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 4219 if (found) { 4220 // skip directory names 4221 const char *p1, *p2; 4222 p1 = buf; 4223 size_t len = strlen(os::file_separator()); 4224 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 4225 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 4226 } else { 4227 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 4228 } 4229 return buf; 4230 } 4231 4232 static void print_signal_handler(outputStream* st, int sig, 4233 char* buf, size_t buflen) { 4234 struct sigaction sa; 4235 4236 sigaction(sig, NULL, &sa); 4237 4238 // See comment for SIGNIFICANT_SIGNAL_MASK define 4239 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 4240 4241 st->print("%s: ", os::exception_name(sig, buf, buflen)); 4242 4243 address handler = (sa.sa_flags & SA_SIGINFO) 4244 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 4245 : CAST_FROM_FN_PTR(address, sa.sa_handler); 4246 4247 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 4248 st->print("SIG_DFL"); 4249 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 4250 st->print("SIG_IGN"); 4251 } else { 4252 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 4253 } 4254 4255 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 4256 4257 address rh = VMError::get_resetted_sighandler(sig); 4258 // May be, handler was resetted by VMError? 4259 if(rh != NULL) { 4260 handler = rh; 4261 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 4262 } 4263 4264 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 4265 4266 // Check: is it our handler? 4267 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 4268 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 4269 // It is our signal handler 4270 // check for flags, reset system-used one! 4271 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 4272 st->print( 4273 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 4274 os::Bsd::get_our_sigflags(sig)); 4275 } 4276 } 4277 st->cr(); 4278 } 4279 4280 4281 #define DO_SIGNAL_CHECK(sig) \ 4282 if (!sigismember(&check_signal_done, sig)) \ 4283 os::Bsd::check_signal_handler(sig) 4284 4285 // This method is a periodic task to check for misbehaving JNI applications 4286 // under CheckJNI, we can add any periodic checks here 4287 4288 void os::run_periodic_checks() { 4289 4290 if (check_signals == false) return; 4291 4292 // SEGV and BUS if overridden could potentially prevent 4293 // generation of hs*.log in the event of a crash, debugging 4294 // such a case can be very challenging, so we absolutely 4295 // check the following for a good measure: 4296 DO_SIGNAL_CHECK(SIGSEGV); 4297 DO_SIGNAL_CHECK(SIGILL); 4298 DO_SIGNAL_CHECK(SIGFPE); 4299 DO_SIGNAL_CHECK(SIGBUS); 4300 DO_SIGNAL_CHECK(SIGPIPE); 4301 DO_SIGNAL_CHECK(SIGXFSZ); 4302 4303 4304 // ReduceSignalUsage allows the user to override these handlers 4305 // see comments at the very top and jvm_solaris.h 4306 if (!ReduceSignalUsage) { 4307 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4308 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4309 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4310 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4311 } 4312 4313 DO_SIGNAL_CHECK(SR_signum); 4314 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 4315 } 4316 4317 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4318 4319 static os_sigaction_t os_sigaction = NULL; 4320 4321 void os::Bsd::check_signal_handler(int sig) { 4322 char buf[O_BUFLEN]; 4323 address jvmHandler = NULL; 4324 4325 4326 struct sigaction act; 4327 if (os_sigaction == NULL) { 4328 // only trust the default sigaction, in case it has been interposed 4329 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4330 if (os_sigaction == NULL) return; 4331 } 4332 4333 os_sigaction(sig, (struct sigaction*)NULL, &act); 4334 4335 4336 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 4337 4338 address thisHandler = (act.sa_flags & SA_SIGINFO) 4339 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4340 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4341 4342 4343 switch(sig) { 4344 case SIGSEGV: 4345 case SIGBUS: 4346 case SIGFPE: 4347 case SIGPIPE: 4348 case SIGILL: 4349 case SIGXFSZ: 4350 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 4351 break; 4352 4353 case SHUTDOWN1_SIGNAL: 4354 case SHUTDOWN2_SIGNAL: 4355 case SHUTDOWN3_SIGNAL: 4356 case BREAK_SIGNAL: 4357 jvmHandler = (address)user_handler(); 4358 break; 4359 4360 case INTERRUPT_SIGNAL: 4361 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 4362 break; 4363 4364 default: 4365 if (sig == SR_signum) { 4366 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 4367 } else { 4368 return; 4369 } 4370 break; 4371 } 4372 4373 if (thisHandler != jvmHandler) { 4374 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4375 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4376 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4377 // No need to check this sig any longer 4378 sigaddset(&check_signal_done, sig); 4379 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 4380 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4381 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 4382 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4383 // No need to check this sig any longer 4384 sigaddset(&check_signal_done, sig); 4385 } 4386 4387 // Dump all the signal 4388 if (sigismember(&check_signal_done, sig)) { 4389 print_signal_handlers(tty, buf, O_BUFLEN); 4390 } 4391 } 4392 4393 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 4394 4395 extern bool signal_name(int signo, char* buf, size_t len); 4396 4397 const char* os::exception_name(int exception_code, char* buf, size_t size) { 4398 if (0 < exception_code && exception_code <= SIGRTMAX) { 4399 // signal 4400 if (!signal_name(exception_code, buf, size)) { 4401 jio_snprintf(buf, size, "SIG%d", exception_code); 4402 } 4403 return buf; 4404 } else { 4405 return NULL; 4406 } 4407 } 4408 4409 // this is called _before_ the most of global arguments have been parsed 4410 void os::init(void) { 4411 char dummy; /* used to get a guess on initial stack address */ 4412 // first_hrtime = gethrtime(); 4413 4414 // With BsdThreads the JavaMain thread pid (primordial thread) 4415 // is different than the pid of the java launcher thread. 4416 // So, on Bsd, the launcher thread pid is passed to the VM 4417 // via the sun.java.launcher.pid property. 4418 // Use this property instead of getpid() if it was correctly passed. 4419 // See bug 6351349. 4420 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 4421 4422 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 4423 4424 clock_tics_per_sec = CLK_TCK; 4425 4426 init_random(1234567); 4427 4428 ThreadCritical::initialize(); 4429 4430 Bsd::set_page_size(getpagesize()); 4431 if (Bsd::page_size() == -1) { 4432 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 4433 strerror(errno))); 4434 } 4435 init_page_sizes((size_t) Bsd::page_size()); 4436 4437 Bsd::initialize_system_info(); 4438 4439 // main_thread points to the aboriginal thread 4440 Bsd::_main_thread = pthread_self(); 4441 4442 Bsd::clock_init(); 4443 initial_time_count = os::elapsed_counter(); 4444 4445 #ifdef __APPLE__ 4446 // XXXDARWIN 4447 // Work around the unaligned VM callbacks in hotspot's 4448 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 4449 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 4450 // alignment when doing symbol lookup. To work around this, we force early 4451 // binding of all symbols now, thus binding when alignment is known-good. 4452 _dyld_bind_fully_image_containing_address((const void *) &os::init); 4453 #endif 4454 } 4455 4456 // To install functions for atexit system call 4457 extern "C" { 4458 static void perfMemory_exit_helper() { 4459 perfMemory_exit(); 4460 } 4461 } 4462 4463 // this is called _after_ the global arguments have been parsed 4464 jint os::init_2(void) 4465 { 4466 #ifndef _ALLBSD_SOURCE 4467 Bsd::fast_thread_clock_init(); 4468 #endif 4469 4470 // Allocate a single page and mark it as readable for safepoint polling 4471 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 4472 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 4473 4474 os::set_polling_page( polling_page ); 4475 4476 #ifndef PRODUCT 4477 if(Verbose && PrintMiscellaneous) 4478 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 4479 #endif 4480 4481 if (!UseMembar) { 4482 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 4483 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4484 os::set_memory_serialize_page( mem_serialize_page ); 4485 4486 #ifndef PRODUCT 4487 if(Verbose && PrintMiscellaneous) 4488 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 4489 #endif 4490 } 4491 4492 os::large_page_init(); 4493 4494 // initialize suspend/resume support - must do this before signal_sets_init() 4495 if (SR_initialize() != 0) { 4496 perror("SR_initialize failed"); 4497 return JNI_ERR; 4498 } 4499 4500 Bsd::signal_sets_init(); 4501 Bsd::install_signal_handlers(); 4502 4503 // Check minimum allowable stack size for thread creation and to initialize 4504 // the java system classes, including StackOverflowError - depends on page 4505 // size. Add a page for compiler2 recursion in main thread. 4506 // Add in 2*BytesPerWord times page size to account for VM stack during 4507 // class initialization depending on 32 or 64 bit VM. 4508 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 4509 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4510 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 4511 4512 size_t threadStackSizeInBytes = ThreadStackSize * K; 4513 if (threadStackSizeInBytes != 0 && 4514 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 4515 tty->print_cr("\nThe stack size specified is too small, " 4516 "Specify at least %dk", 4517 os::Bsd::min_stack_allowed/ K); 4518 return JNI_ERR; 4519 } 4520 4521 // Make the stack size a multiple of the page size so that 4522 // the yellow/red zones can be guarded. 4523 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4524 vm_page_size())); 4525 4526 #ifndef _ALLBSD_SOURCE 4527 Bsd::capture_initial_stack(JavaThread::stack_size_at_create()); 4528 4529 Bsd::libpthread_init(); 4530 if (PrintMiscellaneous && (Verbose || WizardMode)) { 4531 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", 4532 Bsd::glibc_version(), Bsd::libpthread_version(), 4533 Bsd::is_floating_stack() ? "floating stack" : "fixed stack"); 4534 } 4535 4536 if (UseNUMA) { 4537 if (!Bsd::libnuma_init()) { 4538 UseNUMA = false; 4539 } else { 4540 if ((Bsd::numa_max_node() < 1)) { 4541 // There's only one node(they start from 0), disable NUMA. 4542 UseNUMA = false; 4543 } 4544 } 4545 // With SHM large pages we cannot uncommit a page, so there's not way 4546 // we can make the adaptive lgrp chunk resizing work. If the user specified 4547 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and 4548 // disable adaptive resizing. 4549 if (UseNUMA && UseLargePages && UseSHM) { 4550 if (!FLAG_IS_DEFAULT(UseNUMA)) { 4551 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) { 4552 UseLargePages = false; 4553 } else { 4554 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing"); 4555 UseAdaptiveSizePolicy = false; 4556 UseAdaptiveNUMAChunkSizing = false; 4557 } 4558 } else { 4559 UseNUMA = false; 4560 } 4561 } 4562 if (!UseNUMA && ForceNUMA) { 4563 UseNUMA = true; 4564 } 4565 } 4566 #endif 4567 4568 if (MaxFDLimit) { 4569 // set the number of file descriptors to max. print out error 4570 // if getrlimit/setrlimit fails but continue regardless. 4571 struct rlimit nbr_files; 4572 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4573 if (status != 0) { 4574 if (PrintMiscellaneous && (Verbose || WizardMode)) 4575 perror("os::init_2 getrlimit failed"); 4576 } else { 4577 nbr_files.rlim_cur = nbr_files.rlim_max; 4578 4579 #ifdef __APPLE__ 4580 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 4581 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 4582 // be used instead 4583 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 4584 #endif 4585 4586 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4587 if (status != 0) { 4588 if (PrintMiscellaneous && (Verbose || WizardMode)) 4589 perror("os::init_2 setrlimit failed"); 4590 } 4591 } 4592 } 4593 4594 #ifndef _ALLBSD_SOURCE 4595 // Initialize lock used to serialize thread creation (see os::create_thread) 4596 Bsd::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); 4597 #endif 4598 4599 // at-exit methods are called in the reverse order of their registration. 4600 // atexit functions are called on return from main or as a result of a 4601 // call to exit(3C). There can be only 32 of these functions registered 4602 // and atexit() does not set errno. 4603 4604 if (PerfAllowAtExitRegistration) { 4605 // only register atexit functions if PerfAllowAtExitRegistration is set. 4606 // atexit functions can be delayed until process exit time, which 4607 // can be problematic for embedded VM situations. Embedded VMs should 4608 // call DestroyJavaVM() to assure that VM resources are released. 4609 4610 // note: perfMemory_exit_helper atexit function may be removed in 4611 // the future if the appropriate cleanup code can be added to the 4612 // VM_Exit VMOperation's doit method. 4613 if (atexit(perfMemory_exit_helper) != 0) { 4614 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4615 } 4616 } 4617 4618 // initialize thread priority policy 4619 prio_init(); 4620 4621 #ifdef __APPLE__ 4622 // dynamically link to objective c gc registration 4623 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 4624 if (handleLibObjc != NULL) { 4625 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 4626 } 4627 #endif 4628 4629 return JNI_OK; 4630 } 4631 4632 // this is called at the end of vm_initialization 4633 void os::init_3(void) { } 4634 4635 // Mark the polling page as unreadable 4636 void os::make_polling_page_unreadable(void) { 4637 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 4638 fatal("Could not disable polling page"); 4639 }; 4640 4641 // Mark the polling page as readable 4642 void os::make_polling_page_readable(void) { 4643 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 4644 fatal("Could not enable polling page"); 4645 } 4646 }; 4647 4648 int os::active_processor_count() { 4649 #ifdef _ALLBSD_SOURCE 4650 return _processor_count; 4651 #else 4652 // Bsd doesn't yet have a (official) notion of processor sets, 4653 // so just return the number of online processors. 4654 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 4655 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 4656 return online_cpus; 4657 #endif 4658 } 4659 4660 void os::set_native_thread_name(const char *name) { 4661 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 4662 // This is only supported in Snow Leopard and beyond 4663 if (name != NULL) { 4664 // Add a "Java: " prefix to the name 4665 char buf[MAXTHREADNAMESIZE]; 4666 snprintf(buf, sizeof(buf), "Java: %s", name); 4667 pthread_setname_np(buf); 4668 } 4669 #endif 4670 } 4671 4672 bool os::distribute_processes(uint length, uint* distribution) { 4673 // Not yet implemented. 4674 return false; 4675 } 4676 4677 bool os::bind_to_processor(uint processor_id) { 4678 // Not yet implemented. 4679 return false; 4680 } 4681 4682 /// 4683 4684 // Suspends the target using the signal mechanism and then grabs the PC before 4685 // resuming the target. Used by the flat-profiler only 4686 ExtendedPC os::get_thread_pc(Thread* thread) { 4687 // Make sure that it is called by the watcher for the VMThread 4688 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 4689 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4690 4691 ExtendedPC epc; 4692 4693 OSThread* osthread = thread->osthread(); 4694 if (do_suspend(osthread)) { 4695 if (osthread->ucontext() != NULL) { 4696 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 4697 } else { 4698 // NULL context is unexpected, double-check this is the VMThread 4699 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 4700 } 4701 do_resume(osthread); 4702 } 4703 // failure means pthread_kill failed for some reason - arguably this is 4704 // a fatal problem, but such problems are ignored elsewhere 4705 4706 return epc; 4707 } 4708 4709 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 4710 { 4711 #ifdef _ALLBSD_SOURCE 4712 return pthread_cond_timedwait(_cond, _mutex, _abstime); 4713 #else 4714 if (is_NPTL()) { 4715 return pthread_cond_timedwait(_cond, _mutex, _abstime); 4716 } else { 4717 #ifndef IA64 4718 // 6292965: BsdThreads pthread_cond_timedwait() resets FPU control 4719 // word back to default 64bit precision if condvar is signaled. Java 4720 // wants 53bit precision. Save and restore current value. 4721 int fpu = get_fpu_control_word(); 4722 #endif // IA64 4723 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); 4724 #ifndef IA64 4725 set_fpu_control_word(fpu); 4726 #endif // IA64 4727 return status; 4728 } 4729 #endif 4730 } 4731 4732 //////////////////////////////////////////////////////////////////////////////// 4733 // debug support 4734 4735 static address same_page(address x, address y) { 4736 int page_bits = -os::vm_page_size(); 4737 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 4738 return x; 4739 else if (x > y) 4740 return (address)(intptr_t(y) | ~page_bits) + 1; 4741 else 4742 return (address)(intptr_t(y) & page_bits); 4743 } 4744 4745 bool os::find(address addr, outputStream* st) { 4746 Dl_info dlinfo; 4747 memset(&dlinfo, 0, sizeof(dlinfo)); 4748 if (dladdr(addr, &dlinfo)) { 4749 st->print(PTR_FORMAT ": ", addr); 4750 if (dlinfo.dli_sname != NULL) { 4751 st->print("%s+%#x", dlinfo.dli_sname, 4752 addr - (intptr_t)dlinfo.dli_saddr); 4753 } else if (dlinfo.dli_fname) { 4754 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 4755 } else { 4756 st->print("<absolute address>"); 4757 } 4758 if (dlinfo.dli_fname) { 4759 st->print(" in %s", dlinfo.dli_fname); 4760 } 4761 if (dlinfo.dli_fbase) { 4762 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4763 } 4764 st->cr(); 4765 4766 if (Verbose) { 4767 // decode some bytes around the PC 4768 address begin = same_page(addr-40, addr); 4769 address end = same_page(addr+40, addr); 4770 address lowest = (address) dlinfo.dli_sname; 4771 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4772 if (begin < lowest) begin = lowest; 4773 Dl_info dlinfo2; 4774 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 4775 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 4776 end = (address) dlinfo2.dli_saddr; 4777 Disassembler::decode(begin, end, st); 4778 } 4779 return true; 4780 } 4781 return false; 4782 } 4783 4784 //////////////////////////////////////////////////////////////////////////////// 4785 // misc 4786 4787 // This does not do anything on Bsd. This is basically a hook for being 4788 // able to use structured exception handling (thread-local exception filters) 4789 // on, e.g., Win32. 4790 void 4791 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 4792 JavaCallArguments* args, Thread* thread) { 4793 f(value, method, args, thread); 4794 } 4795 4796 void os::print_statistics() { 4797 } 4798 4799 int os::message_box(const char* title, const char* message) { 4800 int i; 4801 fdStream err(defaultStream::error_fd()); 4802 for (i = 0; i < 78; i++) err.print_raw("="); 4803 err.cr(); 4804 err.print_raw_cr(title); 4805 for (i = 0; i < 78; i++) err.print_raw("-"); 4806 err.cr(); 4807 err.print_raw_cr(message); 4808 for (i = 0; i < 78; i++) err.print_raw("="); 4809 err.cr(); 4810 4811 char buf[16]; 4812 // Prevent process from exiting upon "read error" without consuming all CPU 4813 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4814 4815 return buf[0] == 'y' || buf[0] == 'Y'; 4816 } 4817 4818 int os::stat(const char *path, struct stat *sbuf) { 4819 char pathbuf[MAX_PATH]; 4820 if (strlen(path) > MAX_PATH - 1) { 4821 errno = ENAMETOOLONG; 4822 return -1; 4823 } 4824 os::native_path(strcpy(pathbuf, path)); 4825 return ::stat(pathbuf, sbuf); 4826 } 4827 4828 bool os::check_heap(bool force) { 4829 return true; 4830 } 4831 4832 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 4833 return ::vsnprintf(buf, count, format, args); 4834 } 4835 4836 // Is a (classpath) directory empty? 4837 bool os::dir_is_empty(const char* path) { 4838 DIR *dir = NULL; 4839 struct dirent *ptr; 4840 4841 dir = opendir(path); 4842 if (dir == NULL) return true; 4843 4844 /* Scan the directory */ 4845 bool result = true; 4846 char buf[sizeof(struct dirent) + MAX_PATH]; 4847 while (result && (ptr = ::readdir(dir)) != NULL) { 4848 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4849 result = false; 4850 } 4851 } 4852 closedir(dir); 4853 return result; 4854 } 4855 4856 // This code originates from JDK's sysOpen and open64_w 4857 // from src/solaris/hpi/src/system_md.c 4858 4859 #ifndef O_DELETE 4860 #define O_DELETE 0x10000 4861 #endif 4862 4863 // Open a file. Unlink the file immediately after open returns 4864 // if the specified oflag has the O_DELETE flag set. 4865 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 4866 4867 int os::open(const char *path, int oflag, int mode) { 4868 4869 if (strlen(path) > MAX_PATH - 1) { 4870 errno = ENAMETOOLONG; 4871 return -1; 4872 } 4873 int fd; 4874 int o_delete = (oflag & O_DELETE); 4875 oflag = oflag & ~O_DELETE; 4876 4877 fd = ::open(path, oflag, mode); 4878 if (fd == -1) return -1; 4879 4880 //If the open succeeded, the file might still be a directory 4881 { 4882 struct stat buf; 4883 int ret = ::fstat(fd, &buf); 4884 int st_mode = buf.st_mode; 4885 4886 if (ret != -1) { 4887 if ((st_mode & S_IFMT) == S_IFDIR) { 4888 errno = EISDIR; 4889 ::close(fd); 4890 return -1; 4891 } 4892 } else { 4893 ::close(fd); 4894 return -1; 4895 } 4896 } 4897 4898 /* 4899 * All file descriptors that are opened in the JVM and not 4900 * specifically destined for a subprocess should have the 4901 * close-on-exec flag set. If we don't set it, then careless 3rd 4902 * party native code might fork and exec without closing all 4903 * appropriate file descriptors (e.g. as we do in closeDescriptors in 4904 * UNIXProcess.c), and this in turn might: 4905 * 4906 * - cause end-of-file to fail to be detected on some file 4907 * descriptors, resulting in mysterious hangs, or 4908 * 4909 * - might cause an fopen in the subprocess to fail on a system 4910 * suffering from bug 1085341. 4911 * 4912 * (Yes, the default setting of the close-on-exec flag is a Unix 4913 * design flaw) 4914 * 4915 * See: 4916 * 1085341: 32-bit stdio routines should support file descriptors >255 4917 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4918 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4919 */ 4920 #ifdef FD_CLOEXEC 4921 { 4922 int flags = ::fcntl(fd, F_GETFD); 4923 if (flags != -1) 4924 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4925 } 4926 #endif 4927 4928 if (o_delete != 0) { 4929 ::unlink(path); 4930 } 4931 return fd; 4932 } 4933 4934 4935 // create binary file, rewriting existing file if required 4936 int os::create_binary_file(const char* path, bool rewrite_existing) { 4937 int oflags = O_WRONLY | O_CREAT; 4938 if (!rewrite_existing) { 4939 oflags |= O_EXCL; 4940 } 4941 return ::open(path, oflags, S_IREAD | S_IWRITE); 4942 } 4943 4944 // return current position of file pointer 4945 jlong os::current_file_offset(int fd) { 4946 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 4947 } 4948 4949 // move file pointer to the specified offset 4950 jlong os::seek_to_file_offset(int fd, jlong offset) { 4951 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 4952 } 4953 4954 // This code originates from JDK's sysAvailable 4955 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 4956 4957 int os::available(int fd, jlong *bytes) { 4958 jlong cur, end; 4959 int mode; 4960 struct stat buf; 4961 4962 if (::fstat(fd, &buf) >= 0) { 4963 mode = buf.st_mode; 4964 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4965 /* 4966 * XXX: is the following call interruptible? If so, this might 4967 * need to go through the INTERRUPT_IO() wrapper as for other 4968 * blocking, interruptible calls in this file. 4969 */ 4970 int n; 4971 if (::ioctl(fd, FIONREAD, &n) >= 0) { 4972 *bytes = n; 4973 return 1; 4974 } 4975 } 4976 } 4977 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 4978 return 0; 4979 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 4980 return 0; 4981 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 4982 return 0; 4983 } 4984 *bytes = end - cur; 4985 return 1; 4986 } 4987 4988 int os::socket_available(int fd, jint *pbytes) { 4989 if (fd < 0) 4990 return OS_OK; 4991 4992 int ret; 4993 4994 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 4995 4996 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 4997 // is expected to return 0 on failure and 1 on success to the jdk. 4998 4999 return (ret == OS_ERR) ? 0 : 1; 5000 } 5001 5002 // Map a block of memory. 5003 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 5004 char *addr, size_t bytes, bool read_only, 5005 bool allow_exec) { 5006 int prot; 5007 int flags; 5008 5009 if (read_only) { 5010 prot = PROT_READ; 5011 flags = MAP_SHARED; 5012 } else { 5013 prot = PROT_READ | PROT_WRITE; 5014 flags = MAP_PRIVATE; 5015 } 5016 5017 if (allow_exec) { 5018 prot |= PROT_EXEC; 5019 } 5020 5021 if (addr != NULL) { 5022 flags |= MAP_FIXED; 5023 } 5024 5025 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5026 fd, file_offset); 5027 if (mapped_address == MAP_FAILED) { 5028 return NULL; 5029 } 5030 return mapped_address; 5031 } 5032 5033 5034 // Remap a block of memory. 5035 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 5036 char *addr, size_t bytes, bool read_only, 5037 bool allow_exec) { 5038 // same as map_memory() on this OS 5039 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5040 allow_exec); 5041 } 5042 5043 5044 // Unmap a block of memory. 5045 bool os::unmap_memory(char* addr, size_t bytes) { 5046 return munmap(addr, bytes) == 0; 5047 } 5048 5049 #ifndef _ALLBSD_SOURCE 5050 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); 5051 5052 static clockid_t thread_cpu_clockid(Thread* thread) { 5053 pthread_t tid = thread->osthread()->pthread_id(); 5054 clockid_t clockid; 5055 5056 // Get thread clockid 5057 int rc = os::Bsd::pthread_getcpuclockid(tid, &clockid); 5058 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); 5059 return clockid; 5060 } 5061 #endif 5062 5063 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5064 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 5065 // of a thread. 5066 // 5067 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 5068 // the fast estimate available on the platform. 5069 5070 jlong os::current_thread_cpu_time() { 5071 #ifdef __APPLE__ 5072 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 5073 #elif !defined(_ALLBSD_SOURCE) 5074 if (os::Bsd::supports_fast_thread_cpu_time()) { 5075 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); 5076 } else { 5077 // return user + sys since the cost is the same 5078 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); 5079 } 5080 #endif 5081 } 5082 5083 jlong os::thread_cpu_time(Thread* thread) { 5084 #ifndef _ALLBSD_SOURCE 5085 // consistent with what current_thread_cpu_time() returns 5086 if (os::Bsd::supports_fast_thread_cpu_time()) { 5087 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); 5088 } else { 5089 return slow_thread_cpu_time(thread, true /* user + sys */); 5090 } 5091 #endif 5092 } 5093 5094 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5095 #ifdef __APPLE__ 5096 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5097 #elif !defined(_ALLBSD_SOURCE) 5098 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { 5099 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); 5100 } else { 5101 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); 5102 } 5103 #endif 5104 } 5105 5106 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5107 #ifdef __APPLE__ 5108 struct thread_basic_info tinfo; 5109 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 5110 kern_return_t kr; 5111 mach_port_t mach_thread; 5112 5113 mach_thread = pthread_mach_thread_np(thread->osthread()->thread_id()); 5114 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 5115 if (kr != KERN_SUCCESS) 5116 return -1; 5117 5118 if (user_sys_cpu_time) { 5119 jlong nanos; 5120 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 5121 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 5122 return nanos; 5123 } else { 5124 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 5125 } 5126 #elif !defined(_ALLBSD_SOURCE) 5127 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { 5128 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); 5129 } else { 5130 return slow_thread_cpu_time(thread, user_sys_cpu_time); 5131 } 5132 #endif 5133 } 5134 5135 #ifndef _ALLBSD_SOURCE 5136 // 5137 // -1 on error. 5138 // 5139 5140 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5141 static bool proc_pid_cpu_avail = true; 5142 static bool proc_task_unchecked = true; 5143 static const char *proc_stat_path = "/proc/%d/stat"; 5144 pid_t tid = thread->osthread()->thread_id(); 5145 int i; 5146 char *s; 5147 char stat[2048]; 5148 int statlen; 5149 char proc_name[64]; 5150 int count; 5151 long sys_time, user_time; 5152 char string[64]; 5153 char cdummy; 5154 int idummy; 5155 long ldummy; 5156 FILE *fp; 5157 5158 // We first try accessing /proc/<pid>/cpu since this is faster to 5159 // process. If this file is not present (bsd kernels 2.5 and above) 5160 // then we open /proc/<pid>/stat. 5161 if ( proc_pid_cpu_avail ) { 5162 sprintf(proc_name, "/proc/%d/cpu", tid); 5163 fp = fopen(proc_name, "r"); 5164 if ( fp != NULL ) { 5165 count = fscanf( fp, "%s %lu %lu\n", string, &user_time, &sys_time); 5166 fclose(fp); 5167 if ( count != 3 ) return -1; 5168 5169 if (user_sys_cpu_time) { 5170 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); 5171 } else { 5172 return (jlong)user_time * (1000000000 / clock_tics_per_sec); 5173 } 5174 } 5175 else proc_pid_cpu_avail = false; 5176 } 5177 5178 // The /proc/<tid>/stat aggregates per-process usage on 5179 // new Bsd kernels 2.6+ where NPTL is supported. 5180 // The /proc/self/task/<tid>/stat still has the per-thread usage. 5181 // See bug 6328462. 5182 // There can be no directory /proc/self/task on kernels 2.4 with NPTL 5183 // and possibly in some other cases, so we check its availability. 5184 if (proc_task_unchecked && os::Bsd::is_NPTL()) { 5185 // This is executed only once 5186 proc_task_unchecked = false; 5187 fp = fopen("/proc/self/task", "r"); 5188 if (fp != NULL) { 5189 proc_stat_path = "/proc/self/task/%d/stat"; 5190 fclose(fp); 5191 } 5192 } 5193 5194 sprintf(proc_name, proc_stat_path, tid); 5195 fp = fopen(proc_name, "r"); 5196 if ( fp == NULL ) return -1; 5197 statlen = fread(stat, 1, 2047, fp); 5198 stat[statlen] = '\0'; 5199 fclose(fp); 5200 5201 // Skip pid and the command string. Note that we could be dealing with 5202 // weird command names, e.g. user could decide to rename java launcher 5203 // to "java 1.4.2 :)", then the stat file would look like 5204 // 1234 (java 1.4.2 :)) R ... ... 5205 // We don't really need to know the command string, just find the last 5206 // occurrence of ")" and then start parsing from there. See bug 4726580. 5207 s = strrchr(stat, ')'); 5208 i = 0; 5209 if (s == NULL ) return -1; 5210 5211 // Skip blank chars 5212 do s++; while (isspace(*s)); 5213 5214 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", 5215 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, 5216 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, 5217 &user_time, &sys_time); 5218 if ( count != 13 ) return -1; 5219 if (user_sys_cpu_time) { 5220 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); 5221 } else { 5222 return (jlong)user_time * (1000000000 / clock_tics_per_sec); 5223 } 5224 } 5225 #endif 5226 5227 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5228 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5229 info_ptr->may_skip_backward = false; // elapsed time not wall time 5230 info_ptr->may_skip_forward = false; // elapsed time not wall time 5231 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 5232 } 5233 5234 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5235 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5236 info_ptr->may_skip_backward = false; // elapsed time not wall time 5237 info_ptr->may_skip_forward = false; // elapsed time not wall time 5238 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 5239 } 5240 5241 bool os::is_thread_cpu_time_supported() { 5242 #ifdef __APPLE__ 5243 return true; 5244 #elif defined(_ALLBSD_SOURCE) 5245 return false; 5246 #else 5247 return true; 5248 #endif 5249 } 5250 5251 // System loadavg support. Returns -1 if load average cannot be obtained. 5252 // Bsd doesn't yet have a (official) notion of processor sets, 5253 // so just return the system wide load average. 5254 int os::loadavg(double loadavg[], int nelem) { 5255 return ::getloadavg(loadavg, nelem); 5256 } 5257 5258 void os::pause() { 5259 char filename[MAX_PATH]; 5260 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5261 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5262 } else { 5263 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5264 } 5265 5266 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5267 if (fd != -1) { 5268 struct stat buf; 5269 ::close(fd); 5270 while (::stat(filename, &buf) == 0) { 5271 (void)::poll(NULL, 0, 100); 5272 } 5273 } else { 5274 jio_fprintf(stderr, 5275 "Could not open pause file '%s', continuing immediately.\n", filename); 5276 } 5277 } 5278 5279 5280 // Refer to the comments in os_solaris.cpp park-unpark. 5281 // 5282 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 5283 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 5284 // For specifics regarding the bug see GLIBC BUGID 261237 : 5285 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 5286 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 5287 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 5288 // is used. (The simple C test-case provided in the GLIBC bug report manifests the 5289 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 5290 // and monitorenter when we're using 1-0 locking. All those operations may result in 5291 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 5292 // of libpthread avoids the problem, but isn't practical. 5293 // 5294 // Possible remedies: 5295 // 5296 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 5297 // This is palliative and probabilistic, however. If the thread is preempted 5298 // between the call to compute_abstime() and pthread_cond_timedwait(), more 5299 // than the minimum period may have passed, and the abstime may be stale (in the 5300 // past) resultin in a hang. Using this technique reduces the odds of a hang 5301 // but the JVM is still vulnerable, particularly on heavily loaded systems. 5302 // 5303 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 5304 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set 5305 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 5306 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant 5307 // thread. 5308 // 5309 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 5310 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 5311 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). 5312 // This also works well. In fact it avoids kernel-level scalability impediments 5313 // on certain platforms that don't handle lots of active pthread_cond_timedwait() 5314 // timers in a graceful fashion. 5315 // 5316 // 4. When the abstime value is in the past it appears that control returns 5317 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 5318 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we 5319 // can avoid the problem by reinitializing the condvar -- by cond_destroy() 5320 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). 5321 // It may be possible to avoid reinitialization by checking the return 5322 // value from pthread_cond_timedwait(). In addition to reinitializing the 5323 // condvar we must establish the invariant that cond_signal() is only called 5324 // within critical sections protected by the adjunct mutex. This prevents 5325 // cond_signal() from "seeing" a condvar that's in the midst of being 5326 // reinitialized or that is corrupt. Sadly, this invariant obviates the 5327 // desirable signal-after-unlock optimization that avoids futile context switching. 5328 // 5329 // I'm also concerned that some versions of NTPL might allocate an auxilliary 5330 // structure when a condvar is used or initialized. cond_destroy() would 5331 // release the helper structure. Our reinitialize-after-timedwait fix 5332 // put excessive stress on malloc/free and locks protecting the c-heap. 5333 // 5334 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 5335 // It may be possible to refine (4) by checking the kernel and NTPL verisons 5336 // and only enabling the work-around for vulnerable environments. 5337 5338 // utility to compute the abstime argument to timedwait: 5339 // millis is the relative timeout time 5340 // abstime will be the absolute timeout time 5341 // TODO: replace compute_abstime() with unpackTime() 5342 5343 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 5344 if (millis < 0) millis = 0; 5345 struct timeval now; 5346 int status = gettimeofday(&now, NULL); 5347 assert(status == 0, "gettimeofday"); 5348 jlong seconds = millis / 1000; 5349 millis %= 1000; 5350 if (seconds > 50000000) { // see man cond_timedwait(3T) 5351 seconds = 50000000; 5352 } 5353 abstime->tv_sec = now.tv_sec + seconds; 5354 long usec = now.tv_usec + millis * 1000; 5355 if (usec >= 1000000) { 5356 abstime->tv_sec += 1; 5357 usec -= 1000000; 5358 } 5359 abstime->tv_nsec = usec * 1000; 5360 return abstime; 5361 } 5362 5363 5364 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5365 // Conceptually TryPark() should be equivalent to park(0). 5366 5367 int os::PlatformEvent::TryPark() { 5368 for (;;) { 5369 const int v = _Event ; 5370 guarantee ((v == 0) || (v == 1), "invariant") ; 5371 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5372 } 5373 } 5374 5375 void os::PlatformEvent::park() { // AKA "down()" 5376 // Invariant: Only the thread associated with the Event/PlatformEvent 5377 // may call park(). 5378 // TODO: assert that _Assoc != NULL or _Assoc == Self 5379 int v ; 5380 for (;;) { 5381 v = _Event ; 5382 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5383 } 5384 guarantee (v >= 0, "invariant") ; 5385 if (v == 0) { 5386 // Do this the hard way by blocking ... 5387 int status = pthread_mutex_lock(_mutex); 5388 assert_status(status == 0, status, "mutex_lock"); 5389 guarantee (_nParked == 0, "invariant") ; 5390 ++ _nParked ; 5391 while (_Event < 0) { 5392 status = pthread_cond_wait(_cond, _mutex); 5393 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5394 // Treat this the same as if the wait was interrupted 5395 if (status == ETIMEDOUT) { status = EINTR; } 5396 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5397 } 5398 -- _nParked ; 5399 5400 // In theory we could move the ST of 0 into _Event past the unlock(), 5401 // but then we'd need a MEMBAR after the ST. 5402 _Event = 0 ; 5403 status = pthread_mutex_unlock(_mutex); 5404 assert_status(status == 0, status, "mutex_unlock"); 5405 } 5406 guarantee (_Event >= 0, "invariant") ; 5407 } 5408 5409 int os::PlatformEvent::park(jlong millis) { 5410 guarantee (_nParked == 0, "invariant") ; 5411 5412 int v ; 5413 for (;;) { 5414 v = _Event ; 5415 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5416 } 5417 guarantee (v >= 0, "invariant") ; 5418 if (v != 0) return OS_OK ; 5419 5420 // We do this the hard way, by blocking the thread. 5421 // Consider enforcing a minimum timeout value. 5422 struct timespec abst; 5423 compute_abstime(&abst, millis); 5424 5425 int ret = OS_TIMEOUT; 5426 int status = pthread_mutex_lock(_mutex); 5427 assert_status(status == 0, status, "mutex_lock"); 5428 guarantee (_nParked == 0, "invariant") ; 5429 ++_nParked ; 5430 5431 // Object.wait(timo) will return because of 5432 // (a) notification 5433 // (b) timeout 5434 // (c) thread.interrupt 5435 // 5436 // Thread.interrupt and object.notify{All} both call Event::set. 5437 // That is, we treat thread.interrupt as a special case of notification. 5438 // The underlying Solaris implementation, cond_timedwait, admits 5439 // spurious/premature wakeups, but the JLS/JVM spec prevents the 5440 // JVM from making those visible to Java code. As such, we must 5441 // filter out spurious wakeups. We assume all ETIME returns are valid. 5442 // 5443 // TODO: properly differentiate simultaneous notify+interrupt. 5444 // In that case, we should propagate the notify to another waiter. 5445 5446 while (_Event < 0) { 5447 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 5448 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 5449 pthread_cond_destroy (_cond); 5450 pthread_cond_init (_cond, NULL) ; 5451 } 5452 assert_status(status == 0 || status == EINTR || 5453 status == ETIMEDOUT, 5454 status, "cond_timedwait"); 5455 if (!FilterSpuriousWakeups) break ; // previous semantics 5456 if (status == ETIMEDOUT) break ; 5457 // We consume and ignore EINTR and spurious wakeups. 5458 } 5459 --_nParked ; 5460 if (_Event >= 0) { 5461 ret = OS_OK; 5462 } 5463 _Event = 0 ; 5464 status = pthread_mutex_unlock(_mutex); 5465 assert_status(status == 0, status, "mutex_unlock"); 5466 assert (_nParked == 0, "invariant") ; 5467 return ret; 5468 } 5469 5470 void os::PlatformEvent::unpark() { 5471 int v, AnyWaiters ; 5472 for (;;) { 5473 v = _Event ; 5474 if (v > 0) { 5475 // The LD of _Event could have reordered or be satisfied 5476 // by a read-aside from this processor's write buffer. 5477 // To avoid problems execute a barrier and then 5478 // ratify the value. 5479 OrderAccess::fence() ; 5480 if (_Event == v) return ; 5481 continue ; 5482 } 5483 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 5484 } 5485 if (v < 0) { 5486 // Wait for the thread associated with the event to vacate 5487 int status = pthread_mutex_lock(_mutex); 5488 assert_status(status == 0, status, "mutex_lock"); 5489 AnyWaiters = _nParked ; 5490 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 5491 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 5492 AnyWaiters = 0 ; 5493 pthread_cond_signal (_cond); 5494 } 5495 status = pthread_mutex_unlock(_mutex); 5496 assert_status(status == 0, status, "mutex_unlock"); 5497 if (AnyWaiters != 0) { 5498 status = pthread_cond_signal(_cond); 5499 assert_status(status == 0, status, "cond_signal"); 5500 } 5501 } 5502 5503 // Note that we signal() _after dropping the lock for "immortal" Events. 5504 // This is safe and avoids a common class of futile wakeups. In rare 5505 // circumstances this can cause a thread to return prematurely from 5506 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 5507 // simply re-test the condition and re-park itself. 5508 } 5509 5510 5511 // JSR166 5512 // ------------------------------------------------------- 5513 5514 /* 5515 * The solaris and bsd implementations of park/unpark are fairly 5516 * conservative for now, but can be improved. They currently use a 5517 * mutex/condvar pair, plus a a count. 5518 * Park decrements count if > 0, else does a condvar wait. Unpark 5519 * sets count to 1 and signals condvar. Only one thread ever waits 5520 * on the condvar. Contention seen when trying to park implies that someone 5521 * is unparking you, so don't wait. And spurious returns are fine, so there 5522 * is no need to track notifications. 5523 */ 5524 5525 5526 #define NANOSECS_PER_SEC 1000000000 5527 #define NANOSECS_PER_MILLISEC 1000000 5528 #define MAX_SECS 100000000 5529 /* 5530 * This code is common to bsd and solaris and will be moved to a 5531 * common place in dolphin. 5532 * 5533 * The passed in time value is either a relative time in nanoseconds 5534 * or an absolute time in milliseconds. Either way it has to be unpacked 5535 * into suitable seconds and nanoseconds components and stored in the 5536 * given timespec structure. 5537 * Given time is a 64-bit value and the time_t used in the timespec is only 5538 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 5539 * overflow if times way in the future are given. Further on Solaris versions 5540 * prior to 10 there is a restriction (see cond_timedwait) that the specified 5541 * number of seconds, in abstime, is less than current_time + 100,000,000. 5542 * As it will be 28 years before "now + 100000000" will overflow we can 5543 * ignore overflow and just impose a hard-limit on seconds using the value 5544 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 5545 * years from "now". 5546 */ 5547 5548 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 5549 assert (time > 0, "convertTime"); 5550 5551 struct timeval now; 5552 int status = gettimeofday(&now, NULL); 5553 assert(status == 0, "gettimeofday"); 5554 5555 time_t max_secs = now.tv_sec + MAX_SECS; 5556 5557 if (isAbsolute) { 5558 jlong secs = time / 1000; 5559 if (secs > max_secs) { 5560 absTime->tv_sec = max_secs; 5561 } 5562 else { 5563 absTime->tv_sec = secs; 5564 } 5565 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5566 } 5567 else { 5568 jlong secs = time / NANOSECS_PER_SEC; 5569 if (secs >= MAX_SECS) { 5570 absTime->tv_sec = max_secs; 5571 absTime->tv_nsec = 0; 5572 } 5573 else { 5574 absTime->tv_sec = now.tv_sec + secs; 5575 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5576 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5577 absTime->tv_nsec -= NANOSECS_PER_SEC; 5578 ++absTime->tv_sec; // note: this must be <= max_secs 5579 } 5580 } 5581 } 5582 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5583 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5584 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5585 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5586 } 5587 5588 void Parker::park(bool isAbsolute, jlong time) { 5589 // Optional fast-path check: 5590 // Return immediately if a permit is available. 5591 if (_counter > 0) { 5592 _counter = 0 ; 5593 OrderAccess::fence(); 5594 return ; 5595 } 5596 5597 Thread* thread = Thread::current(); 5598 assert(thread->is_Java_thread(), "Must be JavaThread"); 5599 JavaThread *jt = (JavaThread *)thread; 5600 5601 // Optional optimization -- avoid state transitions if there's an interrupt pending. 5602 // Check interrupt before trying to wait 5603 if (Thread::is_interrupted(thread, false)) { 5604 return; 5605 } 5606 5607 // Next, demultiplex/decode time arguments 5608 struct timespec absTime; 5609 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 5610 return; 5611 } 5612 if (time > 0) { 5613 unpackTime(&absTime, isAbsolute, time); 5614 } 5615 5616 5617 // Enter safepoint region 5618 // Beware of deadlocks such as 6317397. 5619 // The per-thread Parker:: mutex is a classic leaf-lock. 5620 // In particular a thread must never block on the Threads_lock while 5621 // holding the Parker:: mutex. If safepoints are pending both the 5622 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5623 ThreadBlockInVM tbivm(jt); 5624 5625 // Don't wait if cannot get lock since interference arises from 5626 // unblocking. Also. check interrupt before trying wait 5627 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 5628 return; 5629 } 5630 5631 int status ; 5632 if (_counter > 0) { // no wait needed 5633 _counter = 0; 5634 status = pthread_mutex_unlock(_mutex); 5635 assert (status == 0, "invariant") ; 5636 OrderAccess::fence(); 5637 return; 5638 } 5639 5640 #ifdef ASSERT 5641 // Don't catch signals while blocked; let the running threads have the signals. 5642 // (This allows a debugger to break into the running thread.) 5643 sigset_t oldsigs; 5644 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 5645 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5646 #endif 5647 5648 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5649 jt->set_suspend_equivalent(); 5650 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5651 5652 if (time == 0) { 5653 status = pthread_cond_wait (_cond, _mutex) ; 5654 } else { 5655 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 5656 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 5657 pthread_cond_destroy (_cond) ; 5658 pthread_cond_init (_cond, NULL); 5659 } 5660 } 5661 assert_status(status == 0 || status == EINTR || 5662 status == ETIMEDOUT, 5663 status, "cond_timedwait"); 5664 5665 #ifdef ASSERT 5666 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5667 #endif 5668 5669 _counter = 0 ; 5670 status = pthread_mutex_unlock(_mutex) ; 5671 assert_status(status == 0, status, "invariant") ; 5672 // If externally suspended while waiting, re-suspend 5673 if (jt->handle_special_suspend_equivalent_condition()) { 5674 jt->java_suspend_self(); 5675 } 5676 5677 OrderAccess::fence(); 5678 } 5679 5680 void Parker::unpark() { 5681 int s, status ; 5682 status = pthread_mutex_lock(_mutex); 5683 assert (status == 0, "invariant") ; 5684 s = _counter; 5685 _counter = 1; 5686 if (s < 1) { 5687 if (WorkAroundNPTLTimedWaitHang) { 5688 status = pthread_cond_signal (_cond) ; 5689 assert (status == 0, "invariant") ; 5690 status = pthread_mutex_unlock(_mutex); 5691 assert (status == 0, "invariant") ; 5692 } else { 5693 status = pthread_mutex_unlock(_mutex); 5694 assert (status == 0, "invariant") ; 5695 status = pthread_cond_signal (_cond) ; 5696 assert (status == 0, "invariant") ; 5697 } 5698 } else { 5699 pthread_mutex_unlock(_mutex); 5700 assert (status == 0, "invariant") ; 5701 } 5702 } 5703 5704 5705 /* Darwin has no "environ" in a dynamic library. */ 5706 #ifdef __APPLE__ 5707 #include <crt_externs.h> 5708 #define environ (*_NSGetEnviron()) 5709 #else 5710 extern char** environ; 5711 #endif 5712 5713 // Run the specified command in a separate process. Return its exit value, 5714 // or -1 on failure (e.g. can't fork a new process). 5715 // Unlike system(), this function can be called from signal handler. It 5716 // doesn't block SIGINT et al. 5717 int os::fork_and_exec(char* cmd) { 5718 const char * argv[4] = {"sh", "-c", cmd, NULL}; 5719 5720 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 5721 // pthread_atfork handlers and reset pthread library. All we need is a 5722 // separate process to execve. Make a direct syscall to fork process. 5723 // On IA64 there's no fork syscall, we have to use fork() and hope for 5724 // the best... 5725 pid_t pid = fork(); 5726 5727 if (pid < 0) { 5728 // fork failed 5729 return -1; 5730 5731 } else if (pid == 0) { 5732 // child process 5733 5734 // execve() in BsdThreads will call pthread_kill_other_threads_np() 5735 // first to kill every thread on the thread list. Because this list is 5736 // not reset by fork() (see notes above), execve() will instead kill 5737 // every thread in the parent process. We know this is the only thread 5738 // in the new process, so make a system call directly. 5739 // IA64 should use normal execve() from glibc to match the glibc fork() 5740 // above. 5741 execve("/bin/sh", (char* const*)argv, environ); 5742 5743 // execve failed 5744 _exit(-1); 5745 5746 } else { 5747 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5748 // care about the actual exit code, for now. 5749 5750 int status; 5751 5752 // Wait for the child process to exit. This returns immediately if 5753 // the child has already exited. */ 5754 while (waitpid(pid, &status, 0) < 0) { 5755 switch (errno) { 5756 case ECHILD: return 0; 5757 case EINTR: break; 5758 default: return -1; 5759 } 5760 } 5761 5762 if (WIFEXITED(status)) { 5763 // The child exited normally; get its exit code. 5764 return WEXITSTATUS(status); 5765 } else if (WIFSIGNALED(status)) { 5766 // The child exited because of a signal 5767 // The best value to return is 0x80 + signal number, 5768 // because that is what all Unix shells do, and because 5769 // it allows callers to distinguish between process exit and 5770 // process death by signal. 5771 return 0x80 + WTERMSIG(status); 5772 } else { 5773 // Unknown exit code; pass it through 5774 return status; 5775 } 5776 } 5777 } 5778 5779 // is_headless_jre() 5780 // 5781 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5782 // in order to report if we are running in a headless jre 5783 // 5784 // Since JDK8 xawt/libmawt.so was moved into the same directory 5785 // as libawt.so, and renamed libawt_xawt.so 5786 // 5787 bool os::is_headless_jre() { 5788 struct stat statbuf; 5789 char buf[MAXPATHLEN]; 5790 char libmawtpath[MAXPATHLEN]; 5791 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 5792 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 5793 char *p; 5794 5795 // Get path to libjvm.so 5796 os::jvm_path(buf, sizeof(buf)); 5797 5798 // Get rid of libjvm.so 5799 p = strrchr(buf, '/'); 5800 if (p == NULL) return false; 5801 else *p = '\0'; 5802 5803 // Get rid of client or server 5804 p = strrchr(buf, '/'); 5805 if (p == NULL) return false; 5806 else *p = '\0'; 5807 5808 // check xawt/libmawt.so 5809 strcpy(libmawtpath, buf); 5810 strcat(libmawtpath, xawtstr); 5811 if (::stat(libmawtpath, &statbuf) == 0) return false; 5812 5813 // check libawt_xawt.so 5814 strcpy(libmawtpath, buf); 5815 strcat(libmawtpath, new_xawtstr); 5816 if (::stat(libmawtpath, &statbuf) == 0) return false; 5817 5818 return true; 5819 }