os_bsd.cpp revision 3190:fdf4deca44ec
1/* 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// no precompiled headers 26#include "classfile/classLoader.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "classfile/vmSymbols.hpp" 29#include "code/icBuffer.hpp" 30#include "code/vtableStubs.hpp" 31#include "compiler/compileBroker.hpp" 32#include "interpreter/interpreter.hpp" 33#include "jvm_bsd.h" 34#include "memory/allocation.inline.hpp" 35#include "memory/filemap.hpp" 36#include "mutex_bsd.inline.hpp" 37#include "oops/oop.inline.hpp" 38#include "os_share_bsd.hpp" 39#include "prims/jniFastGetField.hpp" 40#include "prims/jvm.h" 41#include "prims/jvm_misc.hpp" 42#include "runtime/arguments.hpp" 43#include "runtime/extendedPC.hpp" 44#include "runtime/globals.hpp" 45#include "runtime/interfaceSupport.hpp" 46#include "runtime/java.hpp" 47#include "runtime/javaCalls.hpp" 48#include "runtime/mutexLocker.hpp" 49#include "runtime/objectMonitor.hpp" 50#include "runtime/osThread.hpp" 51#include "runtime/perfMemory.hpp" 52#include "runtime/sharedRuntime.hpp" 53#include "runtime/statSampler.hpp" 54#include "runtime/stubRoutines.hpp" 55#include "runtime/threadCritical.hpp" 56#include "runtime/timer.hpp" 57#include "services/attachListener.hpp" 58#include "services/runtimeService.hpp" 59#include "thread_bsd.inline.hpp" 60#include "utilities/decoder.hpp" 61#include "utilities/defaultStream.hpp" 62#include "utilities/events.hpp" 63#include "utilities/growableArray.hpp" 64#include "utilities/vmError.hpp" 65#ifdef TARGET_ARCH_x86 66# include "assembler_x86.inline.hpp" 67# include "nativeInst_x86.hpp" 68#endif 69#ifdef TARGET_ARCH_sparc 70# include "assembler_sparc.inline.hpp" 71# include "nativeInst_sparc.hpp" 72#endif 73#ifdef TARGET_ARCH_zero 74# include "assembler_zero.inline.hpp" 75# include "nativeInst_zero.hpp" 76#endif 77#ifdef TARGET_ARCH_arm 78# include "assembler_arm.inline.hpp" 79# include "nativeInst_arm.hpp" 80#endif 81#ifdef TARGET_ARCH_ppc 82# include "assembler_ppc.inline.hpp" 83# include "nativeInst_ppc.hpp" 84#endif 85#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) 153 154#define LARGEPAGES_BIT (1 << 6) 155//////////////////////////////////////////////////////////////////////////////// 156// global variables 157julong os::Bsd::_physical_memory = 0; 158 159#ifndef _ALLBSD_SOURCE 160address os::Bsd::_initial_thread_stack_bottom = NULL; 161uintptr_t os::Bsd::_initial_thread_stack_size = 0; 162#endif 163 164int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 165#ifndef _ALLBSD_SOURCE 166int (*os::Bsd::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; 167Mutex* os::Bsd::_createThread_lock = NULL; 168#endif 169pthread_t os::Bsd::_main_thread; 170int os::Bsd::_page_size = -1; 171#ifndef _ALLBSD_SOURCE 172bool os::Bsd::_is_floating_stack = false; 173bool os::Bsd::_is_NPTL = false; 174bool os::Bsd::_supports_fast_thread_cpu_time = false; 175const char * os::Bsd::_glibc_version = NULL; 176const char * os::Bsd::_libpthread_version = NULL; 177#endif 178 179static jlong initial_time_count=0; 180 181static int clock_tics_per_sec = 100; 182 183// For diagnostics to print a message once. see run_periodic_checks 184static sigset_t check_signal_done; 185static bool check_signals = true;; 186 187static pid_t _initial_pid = 0; 188 189/* Signal number used to suspend/resume a thread */ 190 191/* do not use any signal number less than SIGSEGV, see 4355769 */ 192static int SR_signum = SIGUSR2; 193sigset_t SR_sigset; 194 195 196//////////////////////////////////////////////////////////////////////////////// 197// utility functions 198 199static int SR_initialize(); 200static int SR_finalize(); 201 202julong os::available_memory() { 203 return Bsd::available_memory(); 204} 205 206julong os::Bsd::available_memory() { 207#ifdef _ALLBSD_SOURCE 208 // XXXBSD: this is just a stopgap implementation 209 return physical_memory() >> 2; 210#else 211 // values in struct sysinfo are "unsigned long" 212 struct sysinfo si; 213 sysinfo(&si); 214 215 return (julong)si.freeram * si.mem_unit; 216#endif 217} 218 219julong os::physical_memory() { 220 return Bsd::physical_memory(); 221} 222 223julong os::allocatable_physical_memory(julong size) { 224#ifdef _LP64 225 return size; 226#else 227 julong result = MIN2(size, (julong)3800*M); 228 if (!is_allocatable(result)) { 229 // See comments under solaris for alignment considerations 230 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); 231 result = MIN2(size, reasonable_size); 232 } 233 return result; 234#endif // _LP64 235} 236 237//////////////////////////////////////////////////////////////////////////////// 238// environment support 239 240bool os::getenv(const char* name, char* buf, int len) { 241 const char* val = ::getenv(name); 242 if (val != NULL && strlen(val) < (size_t)len) { 243 strcpy(buf, val); 244 return true; 245 } 246 if (len > 0) buf[0] = 0; // return a null string 247 return false; 248} 249 250 251// Return true if user is running as root. 252 253bool os::have_special_privileges() { 254 static bool init = false; 255 static bool privileges = false; 256 if (!init) { 257 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 258 init = true; 259 } 260 return privileges; 261} 262 263 264#ifndef _ALLBSD_SOURCE 265#ifndef SYS_gettid 266// i386: 224, ia64: 1105, amd64: 186, sparc 143 267#ifdef __ia64__ 268#define SYS_gettid 1105 269#elif __i386__ 270#define SYS_gettid 224 271#elif __amd64__ 272#define SYS_gettid 186 273#elif __sparc__ 274#define SYS_gettid 143 275#else 276#error define gettid for the arch 277#endif 278#endif 279#endif 280 281// Cpu architecture string 282#if defined(ZERO) 283static char cpu_arch[] = ZERO_LIBARCH; 284#elif defined(IA64) 285static char cpu_arch[] = "ia64"; 286#elif defined(IA32) 287static char cpu_arch[] = "i386"; 288#elif defined(AMD64) 289static char cpu_arch[] = "amd64"; 290#elif defined(ARM) 291static char cpu_arch[] = "arm"; 292#elif defined(PPC) 293static char cpu_arch[] = "ppc"; 294#elif defined(SPARC) 295# ifdef _LP64 296static char cpu_arch[] = "sparcv9"; 297# else 298static char cpu_arch[] = "sparc"; 299# endif 300#else 301#error Add appropriate cpu_arch setting 302#endif 303 304// Compiler variant 305#ifdef COMPILER2 306#define COMPILER_VARIANT "server" 307#else 308#define COMPILER_VARIANT "client" 309#endif 310 311#ifndef _ALLBSD_SOURCE 312// pid_t gettid() 313// 314// Returns the kernel thread id of the currently running thread. Kernel 315// thread id is used to access /proc. 316// 317// (Note that getpid() on BsdThreads returns kernel thread id too; but 318// on NPTL, it returns the same pid for all threads, as required by POSIX.) 319// 320pid_t os::Bsd::gettid() { 321 int rslt = syscall(SYS_gettid); 322 if (rslt == -1) { 323 // old kernel, no NPTL support 324 return getpid(); 325 } else { 326 return (pid_t)rslt; 327 } 328} 329 330// Most versions of bsd have a bug where the number of processors are 331// determined by looking at the /proc file system. In a chroot environment, 332// the system call returns 1. This causes the VM to act as if it is 333// a single processor and elide locking (see is_MP() call). 334static bool unsafe_chroot_detected = false; 335static const char *unstable_chroot_error = "/proc file system not found.\n" 336 "Java may be unstable running multithreaded in a chroot " 337 "environment on Bsd when /proc filesystem is not mounted."; 338#endif 339 340#ifdef _ALLBSD_SOURCE 341void os::Bsd::initialize_system_info() { 342 int mib[2]; 343 size_t len; 344 int cpu_val; 345 u_long mem_val; 346 347 /* get processors count via hw.ncpus sysctl */ 348 mib[0] = CTL_HW; 349 mib[1] = HW_NCPU; 350 len = sizeof(cpu_val); 351 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 352 set_processor_count(cpu_val); 353 } 354 else { 355 set_processor_count(1); // fallback 356 } 357 358 /* get physical memory via hw.usermem sysctl (hw.usermem is used 359 * instead of hw.physmem because we need size of allocatable memory 360 */ 361 mib[0] = CTL_HW; 362 mib[1] = HW_USERMEM; 363 len = sizeof(mem_val); 364 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) 365 _physical_memory = mem_val; 366 else 367 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 368 369#ifdef __OpenBSD__ 370 { 371 // limit _physical_memory memory view on OpenBSD since 372 // datasize rlimit restricts us anyway. 373 struct rlimit limits; 374 getrlimit(RLIMIT_DATA, &limits); 375 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 376 } 377#endif 378} 379#else 380void os::Bsd::initialize_system_info() { 381 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 382 if (processor_count() == 1) { 383 pid_t pid = os::Bsd::gettid(); 384 char fname[32]; 385 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); 386 FILE *fp = fopen(fname, "r"); 387 if (fp == NULL) { 388 unsafe_chroot_detected = true; 389 } else { 390 fclose(fp); 391 } 392 } 393 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 394 assert(processor_count() > 0, "bsd error"); 395} 396#endif 397 398#ifdef __APPLE__ 399static const char *get_home() { 400 const char *home_dir = ::getenv("HOME"); 401 if ((home_dir == NULL) || (*home_dir == '\0')) { 402 struct passwd *passwd_info = getpwuid(geteuid()); 403 if (passwd_info != NULL) { 404 home_dir = passwd_info->pw_dir; 405 } 406 } 407 408 return home_dir; 409} 410#endif 411 412void os::init_system_properties_values() { 413// char arch[12]; 414// sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 415 416 // The next steps are taken in the product version: 417 // 418 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. 419 // This library should be located at: 420 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. 421 // 422 // If "/jre/lib/" appears at the right place in the path, then we 423 // assume libjvm[_g].so is installed in a JDK and we use this path. 424 // 425 // Otherwise exit with message: "Could not create the Java virtual machine." 426 // 427 // The following extra steps are taken in the debugging version: 428 // 429 // If "/jre/lib/" does NOT appear at the right place in the path 430 // instead of exit check for $JAVA_HOME environment variable. 431 // 432 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 433 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so 434 // it looks like libjvm[_g].so is installed there 435 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. 436 // 437 // Otherwise exit. 438 // 439 // Important note: if the location of libjvm.so changes this 440 // code needs to be changed accordingly. 441 442 // The next few definitions allow the code to be verbatim: 443#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n)) 444#define getenv(n) ::getenv(n) 445 446/* 447 * See ld(1): 448 * The linker uses the following search paths to locate required 449 * shared libraries: 450 * 1: ... 451 * ... 452 * 7: The default directories, normally /lib and /usr/lib. 453 */ 454#ifndef DEFAULT_LIBPATH 455#define DEFAULT_LIBPATH "/lib:/usr/lib" 456#endif 457 458#define EXTENSIONS_DIR "/lib/ext" 459#define ENDORSED_DIR "/lib/endorsed" 460#define REG_DIR "/usr/java/packages" 461 462#ifdef __APPLE__ 463#define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 464#define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 465 const char *user_home_dir = get_home(); 466 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 467 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 468 sizeof(SYS_EXTENSIONS_DIRS); 469#endif 470 471 { 472 /* sysclasspath, java_home, dll_dir */ 473 { 474 char *home_path; 475 char *dll_path; 476 char *pslash; 477 char buf[MAXPATHLEN]; 478 os::jvm_path(buf, sizeof(buf)); 479 480 // Found the full path to libjvm.so. 481 // Now cut the path to <java_home>/jre if we can. 482 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 483 pslash = strrchr(buf, '/'); 484 if (pslash != NULL) 485 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 486 dll_path = malloc(strlen(buf) + 1); 487 if (dll_path == NULL) 488 return; 489 strcpy(dll_path, buf); 490 Arguments::set_dll_dir(dll_path); 491 492 if (pslash != NULL) { 493 pslash = strrchr(buf, '/'); 494 if (pslash != NULL) { 495 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 496#ifndef __APPLE__ 497 pslash = strrchr(buf, '/'); 498 if (pslash != NULL) 499 *pslash = '\0'; /* get rid of /lib */ 500#endif 501 } 502 } 503 504 home_path = malloc(strlen(buf) + 1); 505 if (home_path == NULL) 506 return; 507 strcpy(home_path, buf); 508 Arguments::set_java_home(home_path); 509 510 if (!set_boot_path('/', ':')) 511 return; 512 } 513 514 /* 515 * Where to look for native libraries 516 * 517 * Note: Due to a legacy implementation, most of the library path 518 * is set in the launcher. This was to accomodate linking restrictions 519 * on legacy Bsd implementations (which are no longer supported). 520 * Eventually, all the library path setting will be done here. 521 * 522 * However, to prevent the proliferation of improperly built native 523 * libraries, the new path component /usr/java/packages is added here. 524 * Eventually, all the library path setting will be done here. 525 */ 526 { 527 char *ld_library_path; 528 529 /* 530 * Construct the invariant part of ld_library_path. Note that the 531 * space for the colon and the trailing null are provided by the 532 * nulls included by the sizeof operator (so actually we allocate 533 * a byte more than necessary). 534 */ 535#ifdef __APPLE__ 536 ld_library_path = (char *) malloc(system_ext_size); 537 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 538#else 539 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 540 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 541 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 542#endif 543 544 /* 545 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 546 * should always exist (until the legacy problem cited above is 547 * addressed). 548 */ 549#ifdef __APPLE__ 550 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 551 char *l = getenv("JAVA_LIBRARY_PATH"); 552 if (l != NULL) { 553 char *t = ld_library_path; 554 /* That's +1 for the colon and +1 for the trailing '\0' */ 555 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 556 sprintf(ld_library_path, "%s:%s", l, t); 557 free(t); 558 } 559 560 char *v = getenv("DYLD_LIBRARY_PATH"); 561#else 562 char *v = getenv("LD_LIBRARY_PATH"); 563#endif 564 if (v != NULL) { 565 char *t = ld_library_path; 566 /* That's +1 for the colon and +1 for the trailing '\0' */ 567 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 568 sprintf(ld_library_path, "%s:%s", v, t); 569 free(t); 570 } 571 572#ifdef __APPLE__ 573 // Apple's Java6 has "." at the beginning of java.library.path. 574 // OpenJDK on Windows has "." at the end of java.library.path. 575 // OpenJDK on Linux and Solaris don't have "." in java.library.path 576 // at all. To ease the transition from Apple's Java6 to OpenJDK7, 577 // "." is appended to the end of java.library.path. Yes, this 578 // could cause a change in behavior, but Apple's Java6 behavior 579 // can be achieved by putting "." at the beginning of the 580 // JAVA_LIBRARY_PATH environment variable. 581 { 582 char *t = ld_library_path; 583 // that's +3 for appending ":." and the trailing '\0' 584 ld_library_path = (char *) malloc(strlen(t) + 3); 585 sprintf(ld_library_path, "%s:%s", t, "."); 586 free(t); 587 } 588#endif 589 590 Arguments::set_library_path(ld_library_path); 591 } 592 593 /* 594 * Extensions directories. 595 * 596 * Note that the space for the colon and the trailing null are provided 597 * by the nulls included by the sizeof operator (so actually one byte more 598 * than necessary is allocated). 599 */ 600 { 601#ifdef __APPLE__ 602 char *buf = malloc(strlen(Arguments::get_java_home()) + 603 sizeof(EXTENSIONS_DIR) + system_ext_size); 604 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 605 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 606#else 607 char *buf = malloc(strlen(Arguments::get_java_home()) + 608 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 609 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 610 Arguments::get_java_home()); 611#endif 612 613 Arguments::set_ext_dirs(buf); 614 } 615 616 /* Endorsed standards default directory. */ 617 { 618 char * buf; 619 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 620 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 621 Arguments::set_endorsed_dirs(buf); 622 } 623 } 624 625#ifdef __APPLE__ 626#undef SYS_EXTENSIONS_DIR 627#endif 628#undef malloc 629#undef getenv 630#undef EXTENSIONS_DIR 631#undef ENDORSED_DIR 632 633 // Done 634 return; 635} 636 637//////////////////////////////////////////////////////////////////////////////// 638// breakpoint support 639 640void os::breakpoint() { 641 BREAKPOINT; 642} 643 644extern "C" void breakpoint() { 645 // use debugger to set breakpoint here 646} 647 648//////////////////////////////////////////////////////////////////////////////// 649// signal support 650 651debug_only(static bool signal_sets_initialized = false); 652static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 653 654bool os::Bsd::is_sig_ignored(int sig) { 655 struct sigaction oact; 656 sigaction(sig, (struct sigaction*)NULL, &oact); 657 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 658 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 659 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 660 return true; 661 else 662 return false; 663} 664 665void os::Bsd::signal_sets_init() { 666 // Should also have an assertion stating we are still single-threaded. 667 assert(!signal_sets_initialized, "Already initialized"); 668 // Fill in signals that are necessarily unblocked for all threads in 669 // the VM. Currently, we unblock the following signals: 670 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 671 // by -Xrs (=ReduceSignalUsage)); 672 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 673 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 674 // the dispositions or masks wrt these signals. 675 // Programs embedding the VM that want to use the above signals for their 676 // own purposes must, at this time, use the "-Xrs" option to prevent 677 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 678 // (See bug 4345157, and other related bugs). 679 // In reality, though, unblocking these signals is really a nop, since 680 // these signals are not blocked by default. 681 sigemptyset(&unblocked_sigs); 682 sigemptyset(&allowdebug_blocked_sigs); 683 sigaddset(&unblocked_sigs, SIGILL); 684 sigaddset(&unblocked_sigs, SIGSEGV); 685 sigaddset(&unblocked_sigs, SIGBUS); 686 sigaddset(&unblocked_sigs, SIGFPE); 687 sigaddset(&unblocked_sigs, SR_signum); 688 689 if (!ReduceSignalUsage) { 690 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 691 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 692 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 693 } 694 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 695 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 696 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 697 } 698 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 699 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 700 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 701 } 702 } 703 // Fill in signals that are blocked by all but the VM thread. 704 sigemptyset(&vm_sigs); 705 if (!ReduceSignalUsage) 706 sigaddset(&vm_sigs, BREAK_SIGNAL); 707 debug_only(signal_sets_initialized = true); 708 709} 710 711// These are signals that are unblocked while a thread is running Java. 712// (For some reason, they get blocked by default.) 713sigset_t* os::Bsd::unblocked_signals() { 714 assert(signal_sets_initialized, "Not initialized"); 715 return &unblocked_sigs; 716} 717 718// These are the signals that are blocked while a (non-VM) thread is 719// running Java. Only the VM thread handles these signals. 720sigset_t* os::Bsd::vm_signals() { 721 assert(signal_sets_initialized, "Not initialized"); 722 return &vm_sigs; 723} 724 725// These are signals that are blocked during cond_wait to allow debugger in 726sigset_t* os::Bsd::allowdebug_blocked_signals() { 727 assert(signal_sets_initialized, "Not initialized"); 728 return &allowdebug_blocked_sigs; 729} 730 731void os::Bsd::hotspot_sigmask(Thread* thread) { 732 733 //Save caller's signal mask before setting VM signal mask 734 sigset_t caller_sigmask; 735 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 736 737 OSThread* osthread = thread->osthread(); 738 osthread->set_caller_sigmask(caller_sigmask); 739 740 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 741 742 if (!ReduceSignalUsage) { 743 if (thread->is_VM_thread()) { 744 // Only the VM thread handles BREAK_SIGNAL ... 745 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 746 } else { 747 // ... all other threads block BREAK_SIGNAL 748 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 749 } 750 } 751} 752 753#ifndef _ALLBSD_SOURCE 754////////////////////////////////////////////////////////////////////////////// 755// detecting pthread library 756 757void os::Bsd::libpthread_init() { 758 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION 759 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a 760 // generic name for earlier versions. 761 // Define macros here so we can build HotSpot on old systems. 762# ifndef _CS_GNU_LIBC_VERSION 763# define _CS_GNU_LIBC_VERSION 2 764# endif 765# ifndef _CS_GNU_LIBPTHREAD_VERSION 766# define _CS_GNU_LIBPTHREAD_VERSION 3 767# endif 768 769 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); 770 if (n > 0) { 771 char *str = (char *)malloc(n); 772 confstr(_CS_GNU_LIBC_VERSION, str, n); 773 os::Bsd::set_glibc_version(str); 774 } else { 775 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() 776 static char _gnu_libc_version[32]; 777 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), 778 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); 779 os::Bsd::set_glibc_version(_gnu_libc_version); 780 } 781 782 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); 783 if (n > 0) { 784 char *str = (char *)malloc(n); 785 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); 786 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells 787 // us "NPTL-0.29" even we are running with BsdThreads. Check if this 788 // is the case. BsdThreads has a hard limit on max number of threads. 789 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. 790 // On the other hand, NPTL does not have such a limit, sysconf() 791 // will return -1 and errno is not changed. Check if it is really NPTL. 792 if (strcmp(os::Bsd::glibc_version(), "glibc 2.3.2") == 0 && 793 strstr(str, "NPTL") && 794 sysconf(_SC_THREAD_THREADS_MAX) > 0) { 795 free(str); 796 os::Bsd::set_libpthread_version("bsdthreads"); 797 } else { 798 os::Bsd::set_libpthread_version(str); 799 } 800 } else { 801 // glibc before 2.3.2 only has BsdThreads. 802 os::Bsd::set_libpthread_version("bsdthreads"); 803 } 804 805 if (strstr(libpthread_version(), "NPTL")) { 806 os::Bsd::set_is_NPTL(); 807 } else { 808 os::Bsd::set_is_BsdThreads(); 809 } 810 811 // BsdThreads have two flavors: floating-stack mode, which allows variable 812 // stack size; and fixed-stack mode. NPTL is always floating-stack. 813 if (os::Bsd::is_NPTL() || os::Bsd::supports_variable_stack_size()) { 814 os::Bsd::set_is_floating_stack(); 815 } 816} 817 818///////////////////////////////////////////////////////////////////////////// 819// thread stack 820 821// Force Bsd kernel to expand current thread stack. If "bottom" is close 822// to the stack guard, caller should block all signals. 823// 824// MAP_GROWSDOWN: 825// A special mmap() flag that is used to implement thread stacks. It tells 826// kernel that the memory region should extend downwards when needed. This 827// allows early versions of BsdThreads to only mmap the first few pages 828// when creating a new thread. Bsd kernel will automatically expand thread 829// stack as needed (on page faults). 830// 831// However, because the memory region of a MAP_GROWSDOWN stack can grow on 832// demand, if a page fault happens outside an already mapped MAP_GROWSDOWN 833// region, it's hard to tell if the fault is due to a legitimate stack 834// access or because of reading/writing non-exist memory (e.g. buffer 835// overrun). As a rule, if the fault happens below current stack pointer, 836// Bsd kernel does not expand stack, instead a SIGSEGV is sent to the 837// application (see Bsd kernel fault.c). 838// 839// This Bsd feature can cause SIGSEGV when VM bangs thread stack for 840// stack overflow detection. 841// 842// Newer version of BsdThreads (since glibc-2.2, or, RH-7.x) and NPTL do 843// not use this flag. However, the stack of initial thread is not created 844// by pthread, it is still MAP_GROWSDOWN. Also it's possible (though 845// unlikely) that user code can create a thread with MAP_GROWSDOWN stack 846// and then attach the thread to JVM. 847// 848// To get around the problem and allow stack banging on Bsd, we need to 849// manually expand thread stack after receiving the SIGSEGV. 850// 851// There are two ways to expand thread stack to address "bottom", we used 852// both of them in JVM before 1.5: 853// 1. adjust stack pointer first so that it is below "bottom", and then 854// touch "bottom" 855// 2. mmap() the page in question 856// 857// Now alternate signal stack is gone, it's harder to use 2. For instance, 858// if current sp is already near the lower end of page 101, and we need to 859// call mmap() to map page 100, it is possible that part of the mmap() frame 860// will be placed in page 100. When page 100 is mapped, it is zero-filled. 861// That will destroy the mmap() frame and cause VM to crash. 862// 863// The following code works by adjusting sp first, then accessing the "bottom" 864// page to force a page fault. Bsd kernel will then automatically expand the 865// stack mapping. 866// 867// _expand_stack_to() assumes its frame size is less than page size, which 868// should always be true if the function is not inlined. 869 870#if __GNUC__ < 3 // gcc 2.x does not support noinline attribute 871#define NOINLINE 872#else 873#define NOINLINE __attribute__ ((noinline)) 874#endif 875 876static void _expand_stack_to(address bottom) NOINLINE; 877 878static void _expand_stack_to(address bottom) { 879 address sp; 880 size_t size; 881 volatile char *p; 882 883 // Adjust bottom to point to the largest address within the same page, it 884 // gives us a one-page buffer if alloca() allocates slightly more memory. 885 bottom = (address)align_size_down((uintptr_t)bottom, os::Bsd::page_size()); 886 bottom += os::Bsd::page_size() - 1; 887 888 // sp might be slightly above current stack pointer; if that's the case, we 889 // will alloca() a little more space than necessary, which is OK. Don't use 890 // os::current_stack_pointer(), as its result can be slightly below current 891 // stack pointer, causing us to not alloca enough to reach "bottom". 892 sp = (address)&sp; 893 894 if (sp > bottom) { 895 size = sp - bottom; 896 p = (volatile char *)alloca(size); 897 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); 898 p[0] = '\0'; 899 } 900} 901 902bool os::Bsd::manually_expand_stack(JavaThread * t, address addr) { 903 assert(t!=NULL, "just checking"); 904 assert(t->osthread()->expanding_stack(), "expand should be set"); 905 assert(t->stack_base() != NULL, "stack_base was not initialized"); 906 907 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { 908 sigset_t mask_all, old_sigset; 909 sigfillset(&mask_all); 910 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); 911 _expand_stack_to(addr); 912 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); 913 return true; 914 } 915 return false; 916} 917#endif 918 919////////////////////////////////////////////////////////////////////////////// 920// create new thread 921 922static address highest_vm_reserved_address(); 923 924// check if it's safe to start a new thread 925static bool _thread_safety_check(Thread* thread) { 926#ifdef _ALLBSD_SOURCE 927 return true; 928#else 929 if (os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack()) { 930 // Fixed stack BsdThreads (SuSE Bsd/x86, and some versions of Redhat) 931 // Heap is mmap'ed at lower end of memory space. Thread stacks are 932 // allocated (MAP_FIXED) from high address space. Every thread stack 933 // occupies a fixed size slot (usually 2Mbytes, but user can change 934 // it to other values if they rebuild BsdThreads). 935 // 936 // Problem with MAP_FIXED is that mmap() can still succeed even part of 937 // the memory region has already been mmap'ed. That means if we have too 938 // many threads and/or very large heap, eventually thread stack will 939 // collide with heap. 940 // 941 // Here we try to prevent heap/stack collision by comparing current 942 // stack bottom with the highest address that has been mmap'ed by JVM 943 // plus a safety margin for memory maps created by native code. 944 // 945 // This feature can be disabled by setting ThreadSafetyMargin to 0 946 // 947 if (ThreadSafetyMargin > 0) { 948 address stack_bottom = os::current_stack_base() - os::current_stack_size(); 949 950 // not safe if our stack extends below the safety margin 951 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); 952 } else { 953 return true; 954 } 955 } else { 956 // Floating stack BsdThreads or NPTL: 957 // Unlike fixed stack BsdThreads, thread stacks are not MAP_FIXED. When 958 // there's not enough space left, pthread_create() will fail. If we come 959 // here, that means enough space has been reserved for stack. 960 return true; 961 } 962#endif 963} 964 965#ifdef __APPLE__ 966// library handle for calling objc_registerThreadWithCollector() 967// without static linking to the libobjc library 968#define OBJC_LIB "/usr/lib/libobjc.dylib" 969#define OBJC_GCREGISTER "objc_registerThreadWithCollector" 970typedef void (*objc_registerThreadWithCollector_t)(); 971extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 972objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 973#endif 974 975// Thread start routine for all newly created threads 976static void *java_start(Thread *thread) { 977 // Try to randomize the cache line index of hot stack frames. 978 // This helps when threads of the same stack traces evict each other's 979 // cache lines. The threads can be either from the same JVM instance, or 980 // from different JVM instances. The benefit is especially true for 981 // processors with hyperthreading technology. 982 static int counter = 0; 983 int pid = os::current_process_id(); 984 alloca(((pid ^ counter++) & 7) * 128); 985 986 ThreadLocalStorage::set_thread(thread); 987 988 OSThread* osthread = thread->osthread(); 989 Monitor* sync = osthread->startThread_lock(); 990 991 // non floating stack BsdThreads needs extra check, see above 992 if (!_thread_safety_check(thread)) { 993 // notify parent thread 994 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 995 osthread->set_state(ZOMBIE); 996 sync->notify_all(); 997 return NULL; 998 } 999 1000#ifdef _ALLBSD_SOURCE 1001#ifdef __APPLE__ 1002 // thread_id is mach thread on macos 1003 osthread->set_thread_id(::mach_thread_self()); 1004#else 1005 // thread_id is pthread_id on BSD 1006 osthread->set_thread_id(::pthread_self()); 1007#endif 1008#else 1009 // thread_id is kernel thread id (similar to Solaris LWP id) 1010 osthread->set_thread_id(os::Bsd::gettid()); 1011 1012 if (UseNUMA) { 1013 int lgrp_id = os::numa_get_group_id(); 1014 if (lgrp_id != -1) { 1015 thread->set_lgrp_id(lgrp_id); 1016 } 1017 } 1018#endif 1019 // initialize signal mask for this thread 1020 os::Bsd::hotspot_sigmask(thread); 1021 1022 // initialize floating point control register 1023 os::Bsd::init_thread_fpu_state(); 1024 1025#ifdef __APPLE__ 1026 // register thread with objc gc 1027 if (objc_registerThreadWithCollectorFunction != NULL) { 1028 objc_registerThreadWithCollectorFunction(); 1029 } 1030#endif 1031 1032 // handshaking with parent thread 1033 { 1034 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 1035 1036 // notify parent thread 1037 osthread->set_state(INITIALIZED); 1038 sync->notify_all(); 1039 1040 // wait until os::start_thread() 1041 while (osthread->get_state() == INITIALIZED) { 1042 sync->wait(Mutex::_no_safepoint_check_flag); 1043 } 1044 } 1045 1046 // call one more level start routine 1047 thread->run(); 1048 1049 return 0; 1050} 1051 1052bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1053 assert(thread->osthread() == NULL, "caller responsible"); 1054 1055 // Allocate the OSThread object 1056 OSThread* osthread = new OSThread(NULL, NULL); 1057 if (osthread == NULL) { 1058 return false; 1059 } 1060 1061 // set the correct thread state 1062 osthread->set_thread_type(thr_type); 1063 1064 // Initial state is ALLOCATED but not INITIALIZED 1065 osthread->set_state(ALLOCATED); 1066 1067 thread->set_osthread(osthread); 1068 1069 // init thread attributes 1070 pthread_attr_t attr; 1071 pthread_attr_init(&attr); 1072 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 1073 1074 // stack size 1075 if (os::Bsd::supports_variable_stack_size()) { 1076 // calculate stack size if it's not specified by caller 1077 if (stack_size == 0) { 1078 stack_size = os::Bsd::default_stack_size(thr_type); 1079 1080 switch (thr_type) { 1081 case os::java_thread: 1082 // Java threads use ThreadStackSize which default value can be 1083 // changed with the flag -Xss 1084 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 1085 stack_size = JavaThread::stack_size_at_create(); 1086 break; 1087 case os::compiler_thread: 1088 if (CompilerThreadStackSize > 0) { 1089 stack_size = (size_t)(CompilerThreadStackSize * K); 1090 break; 1091 } // else fall through: 1092 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1093 case os::vm_thread: 1094 case os::pgc_thread: 1095 case os::cgc_thread: 1096 case os::watcher_thread: 1097 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1098 break; 1099 } 1100 } 1101 1102 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 1103 pthread_attr_setstacksize(&attr, stack_size); 1104 } else { 1105 // let pthread_create() pick the default value. 1106 } 1107 1108#ifndef _ALLBSD_SOURCE 1109 // glibc guard page 1110 pthread_attr_setguardsize(&attr, os::Bsd::default_guard_size(thr_type)); 1111#endif 1112 1113 ThreadState state; 1114 1115 { 1116 1117#ifndef _ALLBSD_SOURCE 1118 // Serialize thread creation if we are running with fixed stack BsdThreads 1119 bool lock = os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack(); 1120 if (lock) { 1121 os::Bsd::createThread_lock()->lock_without_safepoint_check(); 1122 } 1123#endif 1124 1125 pthread_t tid; 1126 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 1127 1128 pthread_attr_destroy(&attr); 1129 1130 if (ret != 0) { 1131 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1132 perror("pthread_create()"); 1133 } 1134 // Need to clean up stuff we've allocated so far 1135 thread->set_osthread(NULL); 1136 delete osthread; 1137#ifndef _ALLBSD_SOURCE 1138 if (lock) os::Bsd::createThread_lock()->unlock(); 1139#endif 1140 return false; 1141 } 1142 1143 // Store pthread info into the OSThread 1144 osthread->set_pthread_id(tid); 1145 1146 // Wait until child thread is either initialized or aborted 1147 { 1148 Monitor* sync_with_child = osthread->startThread_lock(); 1149 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 1150 while ((state = osthread->get_state()) == ALLOCATED) { 1151 sync_with_child->wait(Mutex::_no_safepoint_check_flag); 1152 } 1153 } 1154 1155#ifndef _ALLBSD_SOURCE 1156 if (lock) { 1157 os::Bsd::createThread_lock()->unlock(); 1158 } 1159#endif 1160 } 1161 1162 // Aborted due to thread limit being reached 1163 if (state == ZOMBIE) { 1164 thread->set_osthread(NULL); 1165 delete osthread; 1166 return false; 1167 } 1168 1169 // The thread is returned suspended (in state INITIALIZED), 1170 // and is started higher up in the call chain 1171 assert(state == INITIALIZED, "race condition"); 1172 return true; 1173} 1174 1175///////////////////////////////////////////////////////////////////////////// 1176// attach existing thread 1177 1178// bootstrap the main thread 1179bool os::create_main_thread(JavaThread* thread) { 1180 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 1181 return create_attached_thread(thread); 1182} 1183 1184bool os::create_attached_thread(JavaThread* thread) { 1185#ifdef ASSERT 1186 thread->verify_not_published(); 1187#endif 1188 1189 // Allocate the OSThread object 1190 OSThread* osthread = new OSThread(NULL, NULL); 1191 1192 if (osthread == NULL) { 1193 return false; 1194 } 1195 1196 // Store pthread info into the OSThread 1197#ifdef _ALLBSD_SOURCE 1198#ifdef __APPLE__ 1199 osthread->set_thread_id(::mach_thread_self()); 1200#else 1201 osthread->set_thread_id(::pthread_self()); 1202#endif 1203#else 1204 osthread->set_thread_id(os::Bsd::gettid()); 1205#endif 1206 osthread->set_pthread_id(::pthread_self()); 1207 1208 // initialize floating point control register 1209 os::Bsd::init_thread_fpu_state(); 1210 1211 // Initial thread state is RUNNABLE 1212 osthread->set_state(RUNNABLE); 1213 1214 thread->set_osthread(osthread); 1215 1216#ifndef _ALLBSD_SOURCE 1217 if (UseNUMA) { 1218 int lgrp_id = os::numa_get_group_id(); 1219 if (lgrp_id != -1) { 1220 thread->set_lgrp_id(lgrp_id); 1221 } 1222 } 1223 1224 if (os::Bsd::is_initial_thread()) { 1225 // If current thread is initial thread, its stack is mapped on demand, 1226 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map 1227 // the entire stack region to avoid SEGV in stack banging. 1228 // It is also useful to get around the heap-stack-gap problem on SuSE 1229 // kernel (see 4821821 for details). We first expand stack to the top 1230 // of yellow zone, then enable stack yellow zone (order is significant, 1231 // enabling yellow zone first will crash JVM on SuSE Bsd), so there 1232 // is no gap between the last two virtual memory regions. 1233 1234 JavaThread *jt = (JavaThread *)thread; 1235 address addr = jt->stack_yellow_zone_base(); 1236 assert(addr != NULL, "initialization problem?"); 1237 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); 1238 1239 osthread->set_expanding_stack(); 1240 os::Bsd::manually_expand_stack(jt, addr); 1241 osthread->clear_expanding_stack(); 1242 } 1243#endif 1244 1245 // initialize signal mask for this thread 1246 // and save the caller's signal mask 1247 os::Bsd::hotspot_sigmask(thread); 1248 1249 return true; 1250} 1251 1252void os::pd_start_thread(Thread* thread) { 1253 OSThread * osthread = thread->osthread(); 1254 assert(osthread->get_state() != INITIALIZED, "just checking"); 1255 Monitor* sync_with_child = osthread->startThread_lock(); 1256 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 1257 sync_with_child->notify(); 1258} 1259 1260// Free Bsd resources related to the OSThread 1261void os::free_thread(OSThread* osthread) { 1262 assert(osthread != NULL, "osthread not set"); 1263 1264 if (Thread::current()->osthread() == osthread) { 1265 // Restore caller's signal mask 1266 sigset_t sigmask = osthread->caller_sigmask(); 1267 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1268 } 1269 1270 delete osthread; 1271} 1272 1273////////////////////////////////////////////////////////////////////////////// 1274// thread local storage 1275 1276int os::allocate_thread_local_storage() { 1277 pthread_key_t key; 1278 int rslt = pthread_key_create(&key, NULL); 1279 assert(rslt == 0, "cannot allocate thread local storage"); 1280 return (int)key; 1281} 1282 1283// Note: This is currently not used by VM, as we don't destroy TLS key 1284// on VM exit. 1285void os::free_thread_local_storage(int index) { 1286 int rslt = pthread_key_delete((pthread_key_t)index); 1287 assert(rslt == 0, "invalid index"); 1288} 1289 1290void os::thread_local_storage_at_put(int index, void* value) { 1291 int rslt = pthread_setspecific((pthread_key_t)index, value); 1292 assert(rslt == 0, "pthread_setspecific failed"); 1293} 1294 1295extern "C" Thread* get_thread() { 1296 return ThreadLocalStorage::thread(); 1297} 1298 1299////////////////////////////////////////////////////////////////////////////// 1300// initial thread 1301 1302#ifndef _ALLBSD_SOURCE 1303// Check if current thread is the initial thread, similar to Solaris thr_main. 1304bool os::Bsd::is_initial_thread(void) { 1305 char dummy; 1306 // If called before init complete, thread stack bottom will be null. 1307 // Can be called if fatal error occurs before initialization. 1308 if (initial_thread_stack_bottom() == NULL) return false; 1309 assert(initial_thread_stack_bottom() != NULL && 1310 initial_thread_stack_size() != 0, 1311 "os::init did not locate initial thread's stack region"); 1312 if ((address)&dummy >= initial_thread_stack_bottom() && 1313 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) 1314 return true; 1315 else return false; 1316} 1317 1318// Find the virtual memory area that contains addr 1319static bool find_vma(address addr, address* vma_low, address* vma_high) { 1320 FILE *fp = fopen("/proc/self/maps", "r"); 1321 if (fp) { 1322 address low, high; 1323 while (!feof(fp)) { 1324 if (fscanf(fp, "%p-%p", &low, &high) == 2) { 1325 if (low <= addr && addr < high) { 1326 if (vma_low) *vma_low = low; 1327 if (vma_high) *vma_high = high; 1328 fclose (fp); 1329 return true; 1330 } 1331 } 1332 for (;;) { 1333 int ch = fgetc(fp); 1334 if (ch == EOF || ch == (int)'\n') break; 1335 } 1336 } 1337 fclose(fp); 1338 } 1339 return false; 1340} 1341 1342// Locate initial thread stack. This special handling of initial thread stack 1343// is needed because pthread_getattr_np() on most (all?) Bsd distros returns 1344// bogus value for initial thread. 1345void os::Bsd::capture_initial_stack(size_t max_size) { 1346 // stack size is the easy part, get it from RLIMIT_STACK 1347 size_t stack_size; 1348 struct rlimit rlim; 1349 getrlimit(RLIMIT_STACK, &rlim); 1350 stack_size = rlim.rlim_cur; 1351 1352 // 6308388: a bug in ld.so will relocate its own .data section to the 1353 // lower end of primordial stack; reduce ulimit -s value a little bit 1354 // so we won't install guard page on ld.so's data section. 1355 stack_size -= 2 * page_size(); 1356 1357 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat 1358 // 7.1, in both cases we will get 2G in return value. 1359 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, 1360 // SuSE 7.2, Debian) can not handle alternate signal stack correctly 1361 // for initial thread if its stack size exceeds 6M. Cap it at 2M, 1362 // in case other parts in glibc still assumes 2M max stack size. 1363 // FIXME: alt signal stack is gone, maybe we can relax this constraint? 1364#ifndef IA64 1365 if (stack_size > 2 * K * K) stack_size = 2 * K * K; 1366#else 1367 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small 1368 if (stack_size > 4 * K * K) stack_size = 4 * K * K; 1369#endif 1370 1371 // Try to figure out where the stack base (top) is. This is harder. 1372 // 1373 // When an application is started, glibc saves the initial stack pointer in 1374 // a global variable "__libc_stack_end", which is then used by system 1375 // libraries. __libc_stack_end should be pretty close to stack top. The 1376 // variable is available since the very early days. However, because it is 1377 // a private interface, it could disappear in the future. 1378 // 1379 // Bsd kernel saves start_stack information in /proc/<pid>/stat. Similar 1380 // to __libc_stack_end, it is very close to stack top, but isn't the real 1381 // stack top. Note that /proc may not exist if VM is running as a chroot 1382 // program, so reading /proc/<pid>/stat could fail. Also the contents of 1383 // /proc/<pid>/stat could change in the future (though unlikely). 1384 // 1385 // We try __libc_stack_end first. If that doesn't work, look for 1386 // /proc/<pid>/stat. If neither of them works, we use current stack pointer 1387 // as a hint, which should work well in most cases. 1388 1389 uintptr_t stack_start; 1390 1391 // try __libc_stack_end first 1392 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); 1393 if (p && *p) { 1394 stack_start = *p; 1395 } else { 1396 // see if we can get the start_stack field from /proc/self/stat 1397 FILE *fp; 1398 int pid; 1399 char state; 1400 int ppid; 1401 int pgrp; 1402 int session; 1403 int nr; 1404 int tpgrp; 1405 unsigned long flags; 1406 unsigned long minflt; 1407 unsigned long cminflt; 1408 unsigned long majflt; 1409 unsigned long cmajflt; 1410 unsigned long utime; 1411 unsigned long stime; 1412 long cutime; 1413 long cstime; 1414 long prio; 1415 long nice; 1416 long junk; 1417 long it_real; 1418 uintptr_t start; 1419 uintptr_t vsize; 1420 intptr_t rss; 1421 uintptr_t rsslim; 1422 uintptr_t scodes; 1423 uintptr_t ecode; 1424 int i; 1425 1426 // Figure what the primordial thread stack base is. Code is inspired 1427 // by email from Hans Boehm. /proc/self/stat begins with current pid, 1428 // followed by command name surrounded by parentheses, state, etc. 1429 char stat[2048]; 1430 int statlen; 1431 1432 fp = fopen("/proc/self/stat", "r"); 1433 if (fp) { 1434 statlen = fread(stat, 1, 2047, fp); 1435 stat[statlen] = '\0'; 1436 fclose(fp); 1437 1438 // Skip pid and the command string. Note that we could be dealing with 1439 // weird command names, e.g. user could decide to rename java launcher 1440 // to "java 1.4.2 :)", then the stat file would look like 1441 // 1234 (java 1.4.2 :)) R ... ... 1442 // We don't really need to know the command string, just find the last 1443 // occurrence of ")" and then start parsing from there. See bug 4726580. 1444 char * s = strrchr(stat, ')'); 1445 1446 i = 0; 1447 if (s) { 1448 // Skip blank chars 1449 do s++; while (isspace(*s)); 1450 1451#define _UFM UINTX_FORMAT 1452#define _DFM INTX_FORMAT 1453 1454 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ 1455 /* 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 */ 1456 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, 1457 &state, /* 3 %c */ 1458 &ppid, /* 4 %d */ 1459 &pgrp, /* 5 %d */ 1460 &session, /* 6 %d */ 1461 &nr, /* 7 %d */ 1462 &tpgrp, /* 8 %d */ 1463 &flags, /* 9 %lu */ 1464 &minflt, /* 10 %lu */ 1465 &cminflt, /* 11 %lu */ 1466 &majflt, /* 12 %lu */ 1467 &cmajflt, /* 13 %lu */ 1468 &utime, /* 14 %lu */ 1469 &stime, /* 15 %lu */ 1470 &cutime, /* 16 %ld */ 1471 &cstime, /* 17 %ld */ 1472 &prio, /* 18 %ld */ 1473 &nice, /* 19 %ld */ 1474 &junk, /* 20 %ld */ 1475 &it_real, /* 21 %ld */ 1476 &start, /* 22 UINTX_FORMAT */ 1477 &vsize, /* 23 UINTX_FORMAT */ 1478 &rss, /* 24 INTX_FORMAT */ 1479 &rsslim, /* 25 UINTX_FORMAT */ 1480 &scodes, /* 26 UINTX_FORMAT */ 1481 &ecode, /* 27 UINTX_FORMAT */ 1482 &stack_start); /* 28 UINTX_FORMAT */ 1483 } 1484 1485#undef _UFM 1486#undef _DFM 1487 1488 if (i != 28 - 2) { 1489 assert(false, "Bad conversion from /proc/self/stat"); 1490 // product mode - assume we are the initial thread, good luck in the 1491 // embedded case. 1492 warning("Can't detect initial thread stack location - bad conversion"); 1493 stack_start = (uintptr_t) &rlim; 1494 } 1495 } else { 1496 // For some reason we can't open /proc/self/stat (for example, running on 1497 // FreeBSD with a Bsd emulator, or inside chroot), this should work for 1498 // most cases, so don't abort: 1499 warning("Can't detect initial thread stack location - no /proc/self/stat"); 1500 stack_start = (uintptr_t) &rlim; 1501 } 1502 } 1503 1504 // Now we have a pointer (stack_start) very close to the stack top, the 1505 // next thing to do is to figure out the exact location of stack top. We 1506 // can find out the virtual memory area that contains stack_start by 1507 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, 1508 // and its upper limit is the real stack top. (again, this would fail if 1509 // running inside chroot, because /proc may not exist.) 1510 1511 uintptr_t stack_top; 1512 address low, high; 1513 if (find_vma((address)stack_start, &low, &high)) { 1514 // success, "high" is the true stack top. (ignore "low", because initial 1515 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) 1516 stack_top = (uintptr_t)high; 1517 } else { 1518 // failed, likely because /proc/self/maps does not exist 1519 warning("Can't detect initial thread stack location - find_vma failed"); 1520 // best effort: stack_start is normally within a few pages below the real 1521 // stack top, use it as stack top, and reduce stack size so we won't put 1522 // guard page outside stack. 1523 stack_top = stack_start; 1524 stack_size -= 16 * page_size(); 1525 } 1526 1527 // stack_top could be partially down the page so align it 1528 stack_top = align_size_up(stack_top, page_size()); 1529 1530 if (max_size && stack_size > max_size) { 1531 _initial_thread_stack_size = max_size; 1532 } else { 1533 _initial_thread_stack_size = stack_size; 1534 } 1535 1536 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); 1537 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; 1538} 1539#endif 1540 1541//////////////////////////////////////////////////////////////////////////////// 1542// time support 1543 1544// Time since start-up in seconds to a fine granularity. 1545// Used by VMSelfDestructTimer and the MemProfiler. 1546double os::elapsedTime() { 1547 1548 return (double)(os::elapsed_counter()) * 0.000001; 1549} 1550 1551jlong os::elapsed_counter() { 1552 timeval time; 1553 int status = gettimeofday(&time, NULL); 1554 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 1555} 1556 1557jlong os::elapsed_frequency() { 1558 return (1000 * 1000); 1559} 1560 1561// XXX: For now, code this as if BSD does not support vtime. 1562bool os::supports_vtime() { return false; } 1563bool os::enable_vtime() { return false; } 1564bool os::vtime_enabled() { return false; } 1565double os::elapsedVTime() { 1566 // better than nothing, but not much 1567 return elapsedTime(); 1568} 1569 1570jlong os::javaTimeMillis() { 1571 timeval time; 1572 int status = gettimeofday(&time, NULL); 1573 assert(status != -1, "bsd error"); 1574 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1575} 1576 1577#ifndef CLOCK_MONOTONIC 1578#define CLOCK_MONOTONIC (1) 1579#endif 1580 1581#ifdef __APPLE__ 1582void os::Bsd::clock_init() { 1583 // XXXDARWIN: Investigate replacement monotonic clock 1584} 1585#elif defined(_ALLBSD_SOURCE) 1586void os::Bsd::clock_init() { 1587 struct timespec res; 1588 struct timespec tp; 1589 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 1590 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 1591 // yes, monotonic clock is supported 1592 _clock_gettime = ::clock_gettime; 1593 } 1594} 1595#else 1596void os::Bsd::clock_init() { 1597 // we do dlopen's in this particular order due to bug in bsd 1598 // dynamical loader (see 6348968) leading to crash on exit 1599 void* handle = dlopen("librt.so.1", RTLD_LAZY); 1600 if (handle == NULL) { 1601 handle = dlopen("librt.so", RTLD_LAZY); 1602 } 1603 1604 if (handle) { 1605 int (*clock_getres_func)(clockid_t, struct timespec*) = 1606 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); 1607 int (*clock_gettime_func)(clockid_t, struct timespec*) = 1608 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); 1609 if (clock_getres_func && clock_gettime_func) { 1610 // See if monotonic clock is supported by the kernel. Note that some 1611 // early implementations simply return kernel jiffies (updated every 1612 // 1/100 or 1/1000 second). It would be bad to use such a low res clock 1613 // for nano time (though the monotonic property is still nice to have). 1614 // It's fixed in newer kernels, however clock_getres() still returns 1615 // 1/HZ. We check if clock_getres() works, but will ignore its reported 1616 // resolution for now. Hopefully as people move to new kernels, this 1617 // won't be a problem. 1618 struct timespec res; 1619 struct timespec tp; 1620 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && 1621 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { 1622 // yes, monotonic clock is supported 1623 _clock_gettime = clock_gettime_func; 1624 } else { 1625 // close librt if there is no monotonic clock 1626 dlclose(handle); 1627 } 1628 } 1629 } 1630} 1631#endif 1632 1633#ifndef _ALLBSD_SOURCE 1634#ifndef SYS_clock_getres 1635 1636#if defined(IA32) || defined(AMD64) 1637#define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) 1638#define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) 1639#else 1640#warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" 1641#define sys_clock_getres(x,y) -1 1642#endif 1643 1644#else 1645#define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) 1646#endif 1647 1648void os::Bsd::fast_thread_clock_init() { 1649 if (!UseBsdPosixThreadCPUClocks) { 1650 return; 1651 } 1652 clockid_t clockid; 1653 struct timespec tp; 1654 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = 1655 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); 1656 1657 // Switch to using fast clocks for thread cpu time if 1658 // the sys_clock_getres() returns 0 error code. 1659 // Note, that some kernels may support the current thread 1660 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks 1661 // returned by the pthread_getcpuclockid(). 1662 // If the fast Posix clocks are supported then the sys_clock_getres() 1663 // must return at least tp.tv_sec == 0 which means a resolution 1664 // better than 1 sec. This is extra check for reliability. 1665 1666 if(pthread_getcpuclockid_func && 1667 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && 1668 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { 1669 1670 _supports_fast_thread_cpu_time = true; 1671 _pthread_getcpuclockid = pthread_getcpuclockid_func; 1672 } 1673} 1674#endif 1675 1676jlong os::javaTimeNanos() { 1677 if (Bsd::supports_monotonic_clock()) { 1678 struct timespec tp; 1679 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 1680 assert(status == 0, "gettime error"); 1681 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 1682 return result; 1683 } else { 1684 timeval time; 1685 int status = gettimeofday(&time, NULL); 1686 assert(status != -1, "bsd error"); 1687 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1688 return 1000 * usecs; 1689 } 1690} 1691 1692void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1693 if (Bsd::supports_monotonic_clock()) { 1694 info_ptr->max_value = ALL_64_BITS; 1695 1696 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1697 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1698 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1699 } else { 1700 // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1701 info_ptr->max_value = ALL_64_BITS; 1702 1703 // gettimeofday is a real time clock so it skips 1704 info_ptr->may_skip_backward = true; 1705 info_ptr->may_skip_forward = true; 1706 } 1707 1708 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1709} 1710 1711// Return the real, user, and system times in seconds from an 1712// arbitrary fixed point in the past. 1713bool os::getTimesSecs(double* process_real_time, 1714 double* process_user_time, 1715 double* process_system_time) { 1716 struct tms ticks; 1717 clock_t real_ticks = times(&ticks); 1718 1719 if (real_ticks == (clock_t) (-1)) { 1720 return false; 1721 } else { 1722 double ticks_per_second = (double) clock_tics_per_sec; 1723 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1724 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1725 *process_real_time = ((double) real_ticks) / ticks_per_second; 1726 1727 return true; 1728 } 1729} 1730 1731 1732char * os::local_time_string(char *buf, size_t buflen) { 1733 struct tm t; 1734 time_t long_time; 1735 time(&long_time); 1736 localtime_r(&long_time, &t); 1737 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1738 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1739 t.tm_hour, t.tm_min, t.tm_sec); 1740 return buf; 1741} 1742 1743struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1744 return localtime_r(clock, res); 1745} 1746 1747//////////////////////////////////////////////////////////////////////////////// 1748// runtime exit support 1749 1750// Note: os::shutdown() might be called very early during initialization, or 1751// called from signal handler. Before adding something to os::shutdown(), make 1752// sure it is async-safe and can handle partially initialized VM. 1753void os::shutdown() { 1754 1755 // allow PerfMemory to attempt cleanup of any persistent resources 1756 perfMemory_exit(); 1757 1758 // needs to remove object in file system 1759 AttachListener::abort(); 1760 1761 // flush buffered output, finish log files 1762 ostream_abort(); 1763 1764 // Check for abort hook 1765 abort_hook_t abort_hook = Arguments::abort_hook(); 1766 if (abort_hook != NULL) { 1767 abort_hook(); 1768 } 1769 1770} 1771 1772// Note: os::abort() might be called very early during initialization, or 1773// called from signal handler. Before adding something to os::abort(), make 1774// sure it is async-safe and can handle partially initialized VM. 1775void os::abort(bool dump_core) { 1776 os::shutdown(); 1777 if (dump_core) { 1778#ifndef PRODUCT 1779 fdStream out(defaultStream::output_fd()); 1780 out.print_raw("Current thread is "); 1781 char buf[16]; 1782 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1783 out.print_raw_cr(buf); 1784 out.print_raw_cr("Dumping core ..."); 1785#endif 1786 ::abort(); // dump core 1787 } 1788 1789 ::exit(1); 1790} 1791 1792// Die immediately, no exit hook, no abort hook, no cleanup. 1793void os::die() { 1794 // _exit() on BsdThreads only kills current thread 1795 ::abort(); 1796} 1797 1798// unused on bsd for now. 1799void os::set_error_file(const char *logfile) {} 1800 1801 1802// This method is a copy of JDK's sysGetLastErrorString 1803// from src/solaris/hpi/src/system_md.c 1804 1805size_t os::lasterror(char *buf, size_t len) { 1806 1807 if (errno == 0) return 0; 1808 1809 const char *s = ::strerror(errno); 1810 size_t n = ::strlen(s); 1811 if (n >= len) { 1812 n = len - 1; 1813 } 1814 ::strncpy(buf, s, n); 1815 buf[n] = '\0'; 1816 return n; 1817} 1818 1819intx os::current_thread_id() { 1820#ifdef __APPLE__ 1821 return (intx)::mach_thread_self(); 1822#else 1823 return (intx)::pthread_self(); 1824#endif 1825} 1826int os::current_process_id() { 1827 1828 // Under the old bsd thread library, bsd gives each thread 1829 // its own process id. Because of this each thread will return 1830 // a different pid if this method were to return the result 1831 // of getpid(2). Bsd provides no api that returns the pid 1832 // of the launcher thread for the vm. This implementation 1833 // returns a unique pid, the pid of the launcher thread 1834 // that starts the vm 'process'. 1835 1836 // Under the NPTL, getpid() returns the same pid as the 1837 // launcher thread rather than a unique pid per thread. 1838 // Use gettid() if you want the old pre NPTL behaviour. 1839 1840 // if you are looking for the result of a call to getpid() that 1841 // returns a unique pid for the calling thread, then look at the 1842 // OSThread::thread_id() method in osThread_bsd.hpp file 1843 1844 return (int)(_initial_pid ? _initial_pid : getpid()); 1845} 1846 1847// DLL functions 1848 1849#define JNI_LIB_PREFIX "lib" 1850#ifdef __APPLE__ 1851#define JNI_LIB_SUFFIX ".dylib" 1852#else 1853#define JNI_LIB_SUFFIX ".so" 1854#endif 1855 1856const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1857 1858// This must be hard coded because it's the system's temporary 1859// directory not the java application's temp directory, ala java.io.tmpdir. 1860#ifdef __APPLE__ 1861// macosx has a secure per-user temporary directory 1862char temp_path_storage[PATH_MAX]; 1863const char* os::get_temp_directory() { 1864 static char *temp_path = NULL; 1865 if (temp_path == NULL) { 1866 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1867 if (pathSize == 0 || pathSize > PATH_MAX) { 1868 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1869 } 1870 temp_path = temp_path_storage; 1871 } 1872 return temp_path; 1873} 1874#else /* __APPLE__ */ 1875const char* os::get_temp_directory() { return "/tmp"; } 1876#endif /* __APPLE__ */ 1877 1878static bool file_exists(const char* filename) { 1879 struct stat statbuf; 1880 if (filename == NULL || strlen(filename) == 0) { 1881 return false; 1882 } 1883 return os::stat(filename, &statbuf) == 0; 1884} 1885 1886void os::dll_build_name(char* buffer, size_t buflen, 1887 const char* pname, const char* fname) { 1888 // Copied from libhpi 1889 const size_t pnamelen = pname ? strlen(pname) : 0; 1890 1891 // Quietly truncate on buffer overflow. Should be an error. 1892 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1893 *buffer = '\0'; 1894 return; 1895 } 1896 1897 if (pnamelen == 0) { 1898 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1899 } else if (strchr(pname, *os::path_separator()) != NULL) { 1900 int n; 1901 char** pelements = split_path(pname, &n); 1902 for (int i = 0 ; i < n ; i++) { 1903 // Really shouldn't be NULL, but check can't hurt 1904 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1905 continue; // skip the empty path values 1906 } 1907 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1908 pelements[i], fname); 1909 if (file_exists(buffer)) { 1910 break; 1911 } 1912 } 1913 // release the storage 1914 for (int i = 0 ; i < n ; i++) { 1915 if (pelements[i] != NULL) { 1916 FREE_C_HEAP_ARRAY(char, pelements[i]); 1917 } 1918 } 1919 if (pelements != NULL) { 1920 FREE_C_HEAP_ARRAY(char*, pelements); 1921 } 1922 } else { 1923 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1924 } 1925} 1926 1927const char* os::get_current_directory(char *buf, int buflen) { 1928 return getcwd(buf, buflen); 1929} 1930 1931// check if addr is inside libjvm[_g].so 1932bool os::address_is_in_vm(address addr) { 1933 static address libjvm_base_addr; 1934 Dl_info dlinfo; 1935 1936 if (libjvm_base_addr == NULL) { 1937 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1938 libjvm_base_addr = (address)dlinfo.dli_fbase; 1939 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1940 } 1941 1942 if (dladdr((void *)addr, &dlinfo)) { 1943 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1944 } 1945 1946 return false; 1947} 1948 1949bool os::dll_address_to_function_name(address addr, char *buf, 1950 int buflen, int *offset) { 1951 Dl_info dlinfo; 1952 1953 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1954 if (buf != NULL) { 1955 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1956 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1957 } 1958 } 1959 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1960 return true; 1961 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1962 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1963 buf, buflen, offset, dlinfo.dli_fname)) { 1964 return true; 1965 } 1966 } 1967 1968 if (buf != NULL) buf[0] = '\0'; 1969 if (offset != NULL) *offset = -1; 1970 return false; 1971} 1972 1973#ifdef _ALLBSD_SOURCE 1974// ported from solaris version 1975bool os::dll_address_to_library_name(address addr, char* buf, 1976 int buflen, int* offset) { 1977 Dl_info dlinfo; 1978 1979 if (dladdr((void*)addr, &dlinfo)){ 1980 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1981 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1982 return true; 1983 } else { 1984 if (buf) buf[0] = '\0'; 1985 if (offset) *offset = -1; 1986 return false; 1987 } 1988} 1989#else 1990struct _address_to_library_name { 1991 address addr; // input : memory address 1992 size_t buflen; // size of fname 1993 char* fname; // output: library name 1994 address base; // library base addr 1995}; 1996 1997static int address_to_library_name_callback(struct dl_phdr_info *info, 1998 size_t size, void *data) { 1999 int i; 2000 bool found = false; 2001 address libbase = NULL; 2002 struct _address_to_library_name * d = (struct _address_to_library_name *)data; 2003 2004 // iterate through all loadable segments 2005 for (i = 0; i < info->dlpi_phnum; i++) { 2006 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); 2007 if (info->dlpi_phdr[i].p_type == PT_LOAD) { 2008 // base address of a library is the lowest address of its loaded 2009 // segments. 2010 if (libbase == NULL || libbase > segbase) { 2011 libbase = segbase; 2012 } 2013 // see if 'addr' is within current segment 2014 if (segbase <= d->addr && 2015 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { 2016 found = true; 2017 } 2018 } 2019 } 2020 2021 // dlpi_name is NULL or empty if the ELF file is executable, return 0 2022 // so dll_address_to_library_name() can fall through to use dladdr() which 2023 // can figure out executable name from argv[0]. 2024 if (found && info->dlpi_name && info->dlpi_name[0]) { 2025 d->base = libbase; 2026 if (d->fname) { 2027 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); 2028 } 2029 return 1; 2030 } 2031 return 0; 2032} 2033 2034bool os::dll_address_to_library_name(address addr, char* buf, 2035 int buflen, int* offset) { 2036 Dl_info dlinfo; 2037 struct _address_to_library_name data; 2038 2039 // There is a bug in old glibc dladdr() implementation that it could resolve 2040 // to wrong library name if the .so file has a base address != NULL. Here 2041 // we iterate through the program headers of all loaded libraries to find 2042 // out which library 'addr' really belongs to. This workaround can be 2043 // removed once the minimum requirement for glibc is moved to 2.3.x. 2044 data.addr = addr; 2045 data.fname = buf; 2046 data.buflen = buflen; 2047 data.base = NULL; 2048 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); 2049 2050 if (rslt) { 2051 // buf already contains library name 2052 if (offset) *offset = addr - data.base; 2053 return true; 2054 } else if (dladdr((void*)addr, &dlinfo)){ 2055 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 2056 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 2057 return true; 2058 } else { 2059 if (buf) buf[0] = '\0'; 2060 if (offset) *offset = -1; 2061 return false; 2062 } 2063} 2064#endif 2065 2066 // Loads .dll/.so and 2067 // in case of error it checks if .dll/.so was built for the 2068 // same architecture as Hotspot is running on 2069 2070#ifdef __APPLE__ 2071void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 2072 void * result= ::dlopen(filename, RTLD_LAZY); 2073 if (result != NULL) { 2074 // Successful loading 2075 return result; 2076 } 2077 2078 // Read system error message into ebuf 2079 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2080 ebuf[ebuflen-1]='\0'; 2081 2082 return NULL; 2083} 2084#else 2085void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 2086{ 2087 void * result= ::dlopen(filename, RTLD_LAZY); 2088 if (result != NULL) { 2089 // Successful loading 2090 return result; 2091 } 2092 2093 Elf32_Ehdr elf_head; 2094 2095 // Read system error message into ebuf 2096 // It may or may not be overwritten below 2097 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2098 ebuf[ebuflen-1]='\0'; 2099 int diag_msg_max_length=ebuflen-strlen(ebuf); 2100 char* diag_msg_buf=ebuf+strlen(ebuf); 2101 2102 if (diag_msg_max_length==0) { 2103 // No more space in ebuf for additional diagnostics message 2104 return NULL; 2105 } 2106 2107 2108 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 2109 2110 if (file_descriptor < 0) { 2111 // Can't open library, report dlerror() message 2112 return NULL; 2113 } 2114 2115 bool failed_to_read_elf_head= 2116 (sizeof(elf_head)!= 2117 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 2118 2119 ::close(file_descriptor); 2120 if (failed_to_read_elf_head) { 2121 // file i/o error - report dlerror() msg 2122 return NULL; 2123 } 2124 2125 typedef struct { 2126 Elf32_Half code; // Actual value as defined in elf.h 2127 Elf32_Half compat_class; // Compatibility of archs at VM's sense 2128 char elf_class; // 32 or 64 bit 2129 char endianess; // MSB or LSB 2130 char* name; // String representation 2131 } arch_t; 2132 2133 #ifndef EM_486 2134 #define EM_486 6 /* Intel 80486 */ 2135 #endif 2136 2137 #ifndef EM_MIPS_RS3_LE 2138 #define EM_MIPS_RS3_LE 10 /* MIPS */ 2139 #endif 2140 2141 #ifndef EM_PPC64 2142 #define EM_PPC64 21 /* PowerPC64 */ 2143 #endif 2144 2145 #ifndef EM_S390 2146 #define EM_S390 22 /* IBM System/390 */ 2147 #endif 2148 2149 #ifndef EM_IA_64 2150 #define EM_IA_64 50 /* HP/Intel IA-64 */ 2151 #endif 2152 2153 #ifndef EM_X86_64 2154 #define EM_X86_64 62 /* AMD x86-64 */ 2155 #endif 2156 2157 static const arch_t arch_array[]={ 2158 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2159 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2160 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 2161 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 2162 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2163 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2164 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2165 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2166 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2167 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 2168 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 2169 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 2170 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 2171 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 2172 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 2173 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 2174 }; 2175 2176 #if (defined IA32) 2177 static Elf32_Half running_arch_code=EM_386; 2178 #elif (defined AMD64) 2179 static Elf32_Half running_arch_code=EM_X86_64; 2180 #elif (defined IA64) 2181 static Elf32_Half running_arch_code=EM_IA_64; 2182 #elif (defined __sparc) && (defined _LP64) 2183 static Elf32_Half running_arch_code=EM_SPARCV9; 2184 #elif (defined __sparc) && (!defined _LP64) 2185 static Elf32_Half running_arch_code=EM_SPARC; 2186 #elif (defined __powerpc64__) 2187 static Elf32_Half running_arch_code=EM_PPC64; 2188 #elif (defined __powerpc__) 2189 static Elf32_Half running_arch_code=EM_PPC; 2190 #elif (defined ARM) 2191 static Elf32_Half running_arch_code=EM_ARM; 2192 #elif (defined S390) 2193 static Elf32_Half running_arch_code=EM_S390; 2194 #elif (defined ALPHA) 2195 static Elf32_Half running_arch_code=EM_ALPHA; 2196 #elif (defined MIPSEL) 2197 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 2198 #elif (defined PARISC) 2199 static Elf32_Half running_arch_code=EM_PARISC; 2200 #elif (defined MIPS) 2201 static Elf32_Half running_arch_code=EM_MIPS; 2202 #elif (defined M68K) 2203 static Elf32_Half running_arch_code=EM_68K; 2204 #else 2205 #error Method os::dll_load requires that one of following is defined:\ 2206 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 2207 #endif 2208 2209 // Identify compatability class for VM's architecture and library's architecture 2210 // Obtain string descriptions for architectures 2211 2212 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2213 int running_arch_index=-1; 2214 2215 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2216 if (running_arch_code == arch_array[i].code) { 2217 running_arch_index = i; 2218 } 2219 if (lib_arch.code == arch_array[i].code) { 2220 lib_arch.compat_class = arch_array[i].compat_class; 2221 lib_arch.name = arch_array[i].name; 2222 } 2223 } 2224 2225 assert(running_arch_index != -1, 2226 "Didn't find running architecture code (running_arch_code) in arch_array"); 2227 if (running_arch_index == -1) { 2228 // Even though running architecture detection failed 2229 // we may still continue with reporting dlerror() message 2230 return NULL; 2231 } 2232 2233 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2234 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2235 return NULL; 2236 } 2237 2238#ifndef S390 2239 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2240 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2241 return NULL; 2242 } 2243#endif // !S390 2244 2245 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2246 if ( lib_arch.name!=NULL ) { 2247 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2248 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2249 lib_arch.name, arch_array[running_arch_index].name); 2250 } else { 2251 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2252 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2253 lib_arch.code, 2254 arch_array[running_arch_index].name); 2255 } 2256 } 2257 2258 return NULL; 2259} 2260#endif /* !__APPLE__ */ 2261 2262// XXX: Do we need a lock around this as per Linux? 2263void* os::dll_lookup(void* handle, const char* name) { 2264 return dlsym(handle, name); 2265} 2266 2267 2268static bool _print_ascii_file(const char* filename, outputStream* st) { 2269 int fd = ::open(filename, O_RDONLY); 2270 if (fd == -1) { 2271 return false; 2272 } 2273 2274 char buf[32]; 2275 int bytes; 2276 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2277 st->print_raw(buf, bytes); 2278 } 2279 2280 ::close(fd); 2281 2282 return true; 2283} 2284 2285void os::print_dll_info(outputStream *st) { 2286 st->print_cr("Dynamic libraries:"); 2287#ifdef _ALLBSD_SOURCE 2288#ifdef RTLD_DI_LINKMAP 2289 Dl_info dli; 2290 void *handle; 2291 Link_map *map; 2292 Link_map *p; 2293 2294 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 2295 st->print_cr("Error: Cannot print dynamic libraries."); 2296 return; 2297 } 2298 handle = dlopen(dli.dli_fname, RTLD_LAZY); 2299 if (handle == NULL) { 2300 st->print_cr("Error: Cannot print dynamic libraries."); 2301 return; 2302 } 2303 dlinfo(handle, RTLD_DI_LINKMAP, &map); 2304 if (map == NULL) { 2305 st->print_cr("Error: Cannot print dynamic libraries."); 2306 return; 2307 } 2308 2309 while (map->l_prev != NULL) 2310 map = map->l_prev; 2311 2312 while (map != NULL) { 2313 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 2314 map = map->l_next; 2315 } 2316 2317 dlclose(handle); 2318#elif defined(__APPLE__) 2319 uint32_t count; 2320 uint32_t i; 2321 2322 count = _dyld_image_count(); 2323 for (i = 1; i < count; i++) { 2324 const char *name = _dyld_get_image_name(i); 2325 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 2326 st->print_cr(PTR_FORMAT " \t%s", slide, name); 2327 } 2328#else 2329 st->print_cr("Error: Cannot print dynamic libraries."); 2330#endif 2331#else 2332 char fname[32]; 2333 pid_t pid = os::Bsd::gettid(); 2334 2335 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); 2336 2337 if (!_print_ascii_file(fname, st)) { 2338 st->print("Can not get library information for pid = %d\n", pid); 2339 } 2340#endif 2341} 2342 2343 2344void os::print_os_info(outputStream* st) { 2345 st->print("OS:"); 2346 2347 // Try to identify popular distros. 2348 // Most Bsd distributions have /etc/XXX-release file, which contains 2349 // the OS version string. Some have more than one /etc/XXX-release file 2350 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), 2351 // so the order is important. 2352 if (!_print_ascii_file("/etc/mandrake-release", st) && 2353 !_print_ascii_file("/etc/sun-release", st) && 2354 !_print_ascii_file("/etc/redhat-release", st) && 2355 !_print_ascii_file("/etc/SuSE-release", st) && 2356 !_print_ascii_file("/etc/turbobsd-release", st) && 2357 !_print_ascii_file("/etc/gentoo-release", st) && 2358 !_print_ascii_file("/etc/debian_version", st) && 2359 !_print_ascii_file("/etc/ltib-release", st) && 2360 !_print_ascii_file("/etc/angstrom-version", st)) { 2361 st->print("Bsd"); 2362 } 2363 st->cr(); 2364 2365 // kernel 2366 st->print("uname:"); 2367 struct utsname name; 2368 uname(&name); 2369 st->print(name.sysname); st->print(" "); 2370 st->print(name.release); st->print(" "); 2371 st->print(name.version); st->print(" "); 2372 st->print(name.machine); 2373 st->cr(); 2374 2375#ifndef _ALLBSD_SOURCE 2376 // Print warning if unsafe chroot environment detected 2377 if (unsafe_chroot_detected) { 2378 st->print("WARNING!! "); 2379 st->print_cr(unstable_chroot_error); 2380 } 2381 2382 // libc, pthread 2383 st->print("libc:"); 2384 st->print(os::Bsd::glibc_version()); st->print(" "); 2385 st->print(os::Bsd::libpthread_version()); st->print(" "); 2386 if (os::Bsd::is_BsdThreads()) { 2387 st->print("(%s stack)", os::Bsd::is_floating_stack() ? "floating" : "fixed"); 2388 } 2389 st->cr(); 2390#endif 2391 2392 // rlimit 2393 st->print("rlimit:"); 2394 struct rlimit rlim; 2395 2396 st->print(" STACK "); 2397 getrlimit(RLIMIT_STACK, &rlim); 2398 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2399 else st->print("%uk", rlim.rlim_cur >> 10); 2400 2401 st->print(", CORE "); 2402 getrlimit(RLIMIT_CORE, &rlim); 2403 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2404 else st->print("%uk", rlim.rlim_cur >> 10); 2405 2406 st->print(", NPROC "); 2407 getrlimit(RLIMIT_NPROC, &rlim); 2408 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2409 else st->print("%d", rlim.rlim_cur); 2410 2411 st->print(", NOFILE "); 2412 getrlimit(RLIMIT_NOFILE, &rlim); 2413 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2414 else st->print("%d", rlim.rlim_cur); 2415 2416#ifndef _ALLBSD_SOURCE 2417 st->print(", AS "); 2418 getrlimit(RLIMIT_AS, &rlim); 2419 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2420 else st->print("%uk", rlim.rlim_cur >> 10); 2421 st->cr(); 2422 2423 // load average 2424 st->print("load average:"); 2425 double loadavg[3]; 2426 os::loadavg(loadavg, 3); 2427 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 2428 st->cr(); 2429#endif 2430} 2431 2432void os::pd_print_cpu_info(outputStream* st) { 2433 // Nothing to do for now. 2434} 2435 2436void os::print_memory_info(outputStream* st) { 2437 2438 st->print("Memory:"); 2439 st->print(" %dk page", os::vm_page_size()>>10); 2440 2441#ifndef _ALLBSD_SOURCE 2442 // values in struct sysinfo are "unsigned long" 2443 struct sysinfo si; 2444 sysinfo(&si); 2445#endif 2446 2447 st->print(", physical " UINT64_FORMAT "k", 2448 os::physical_memory() >> 10); 2449 st->print("(" UINT64_FORMAT "k free)", 2450 os::available_memory() >> 10); 2451#ifndef _ALLBSD_SOURCE 2452 st->print(", swap " UINT64_FORMAT "k", 2453 ((jlong)si.totalswap * si.mem_unit) >> 10); 2454 st->print("(" UINT64_FORMAT "k free)", 2455 ((jlong)si.freeswap * si.mem_unit) >> 10); 2456#endif 2457 st->cr(); 2458 2459 // meminfo 2460 st->print("\n/proc/meminfo:\n"); 2461 _print_ascii_file("/proc/meminfo", st); 2462 st->cr(); 2463} 2464 2465// Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 2466// but they're the same for all the bsd arch that we support 2467// and they're the same for solaris but there's no common place to put this. 2468const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2469 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2470 "ILL_COPROC", "ILL_BADSTK" }; 2471 2472const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2473 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2474 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 2475 2476const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2477 2478const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2479 2480void os::print_siginfo(outputStream* st, void* siginfo) { 2481 st->print("siginfo:"); 2482 2483 const int buflen = 100; 2484 char buf[buflen]; 2485 siginfo_t *si = (siginfo_t*)siginfo; 2486 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2487 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 2488 st->print("si_errno=%s", buf); 2489 } else { 2490 st->print("si_errno=%d", si->si_errno); 2491 } 2492 const int c = si->si_code; 2493 assert(c > 0, "unexpected si_code"); 2494 switch (si->si_signo) { 2495 case SIGILL: 2496 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2497 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2498 break; 2499 case SIGFPE: 2500 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2501 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2502 break; 2503 case SIGSEGV: 2504 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2505 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2506 break; 2507 case SIGBUS: 2508 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2509 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2510 break; 2511 default: 2512 st->print(", si_code=%d", si->si_code); 2513 // no si_addr 2514 } 2515 2516 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2517 UseSharedSpaces) { 2518 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2519 if (mapinfo->is_in_shared_space(si->si_addr)) { 2520 st->print("\n\nError accessing class data sharing archive." \ 2521 " Mapped file inaccessible during execution, " \ 2522 " possible disk/network problem."); 2523 } 2524 } 2525 st->cr(); 2526} 2527 2528 2529static void print_signal_handler(outputStream* st, int sig, 2530 char* buf, size_t buflen); 2531 2532void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2533 st->print_cr("Signal Handlers:"); 2534 print_signal_handler(st, SIGSEGV, buf, buflen); 2535 print_signal_handler(st, SIGBUS , buf, buflen); 2536 print_signal_handler(st, SIGFPE , buf, buflen); 2537 print_signal_handler(st, SIGPIPE, buf, buflen); 2538 print_signal_handler(st, SIGXFSZ, buf, buflen); 2539 print_signal_handler(st, SIGILL , buf, buflen); 2540 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2541 print_signal_handler(st, SR_signum, buf, buflen); 2542 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 2543 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2544 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 2545 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2546} 2547 2548static char saved_jvm_path[MAXPATHLEN] = {0}; 2549 2550// Find the full path to the current module, libjvm or libjvm_g 2551void os::jvm_path(char *buf, jint buflen) { 2552 // Error checking. 2553 if (buflen < MAXPATHLEN) { 2554 assert(false, "must use a large-enough buffer"); 2555 buf[0] = '\0'; 2556 return; 2557 } 2558 // Lazy resolve the path to current module. 2559 if (saved_jvm_path[0] != 0) { 2560 strcpy(buf, saved_jvm_path); 2561 return; 2562 } 2563 2564 char dli_fname[MAXPATHLEN]; 2565 bool ret = dll_address_to_library_name( 2566 CAST_FROM_FN_PTR(address, os::jvm_path), 2567 dli_fname, sizeof(dli_fname), NULL); 2568 assert(ret != 0, "cannot locate libjvm"); 2569 char *rp = realpath(dli_fname, buf); 2570 if (rp == NULL) 2571 return; 2572 2573 if (Arguments::created_by_gamma_launcher()) { 2574 // Support for the gamma launcher. Typical value for buf is 2575 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 2576 // the right place in the string, then assume we are installed in a JDK and 2577 // we're done. Otherwise, check for a JAVA_HOME environment variable and 2578 // construct a path to the JVM being overridden. 2579 2580 const char *p = buf + strlen(buf) - 1; 2581 for (int count = 0; p > buf && count < 5; ++count) { 2582 for (--p; p > buf && *p != '/'; --p) 2583 /* empty */ ; 2584 } 2585 2586 if (strncmp(p, "/jre/lib/", 9) != 0) { 2587 // Look for JAVA_HOME in the environment. 2588 char* java_home_var = ::getenv("JAVA_HOME"); 2589 if (java_home_var != NULL && java_home_var[0] != 0) { 2590 char* jrelib_p; 2591 int len; 2592 2593 // Check the current module name "libjvm" or "libjvm_g". 2594 p = strrchr(buf, '/'); 2595 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2596 p = strstr(p, "_g") ? "_g" : ""; 2597 2598 rp = realpath(java_home_var, buf); 2599 if (rp == NULL) 2600 return; 2601 2602 // determine if this is a legacy image or modules image 2603 // modules image doesn't have "jre" subdirectory 2604 len = strlen(buf); 2605 jrelib_p = buf + len; 2606 2607 // Add the appropriate library subdir 2608 snprintf(jrelib_p, buflen-len, "/jre/lib"); 2609 if (0 != access(buf, F_OK)) { 2610 snprintf(jrelib_p, buflen-len, "/lib"); 2611 } 2612 2613 // Add the appropriate client or server subdir 2614 len = strlen(buf); 2615 jrelib_p = buf + len; 2616 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 2617 if (0 != access(buf, F_OK)) { 2618 snprintf(jrelib_p, buflen-len, ""); 2619 } 2620 2621 // If the path exists within JAVA_HOME, add the JVM library name 2622 // to complete the path to JVM being overridden. Otherwise fallback 2623 // to the path to the current library. 2624 if (0 == access(buf, F_OK)) { 2625 // Use current module name "libjvm[_g]" instead of 2626 // "libjvm"debug_only("_g")"" since for fastdebug version 2627 // we should have "libjvm" but debug_only("_g") adds "_g"! 2628 len = strlen(buf); 2629 snprintf(buf + len, buflen-len, "/libjvm%s%s", p, JNI_LIB_SUFFIX); 2630 } else { 2631 // Fall back to path of current library 2632 rp = realpath(dli_fname, buf); 2633 if (rp == NULL) 2634 return; 2635 } 2636 } 2637 } 2638 } 2639 2640 strcpy(saved_jvm_path, buf); 2641} 2642 2643void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2644 // no prefix required, not even "_" 2645} 2646 2647void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2648 // no suffix required 2649} 2650 2651//////////////////////////////////////////////////////////////////////////////// 2652// sun.misc.Signal support 2653 2654static volatile jint sigint_count = 0; 2655 2656static void 2657UserHandler(int sig, void *siginfo, void *context) { 2658 // 4511530 - sem_post is serialized and handled by the manager thread. When 2659 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 2660 // don't want to flood the manager thread with sem_post requests. 2661 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 2662 return; 2663 2664 // Ctrl-C is pressed during error reporting, likely because the error 2665 // handler fails to abort. Let VM die immediately. 2666 if (sig == SIGINT && is_error_reported()) { 2667 os::die(); 2668 } 2669 2670 os::signal_notify(sig); 2671} 2672 2673void* os::user_handler() { 2674 return CAST_FROM_FN_PTR(void*, UserHandler); 2675} 2676 2677extern "C" { 2678 typedef void (*sa_handler_t)(int); 2679 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2680} 2681 2682void* os::signal(int signal_number, void* handler) { 2683 struct sigaction sigAct, oldSigAct; 2684 2685 sigfillset(&(sigAct.sa_mask)); 2686 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 2687 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2688 2689 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2690 // -1 means registration failed 2691 return (void *)-1; 2692 } 2693 2694 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2695} 2696 2697void os::signal_raise(int signal_number) { 2698 ::raise(signal_number); 2699} 2700 2701/* 2702 * The following code is moved from os.cpp for making this 2703 * code platform specific, which it is by its very nature. 2704 */ 2705 2706// Will be modified when max signal is changed to be dynamic 2707int os::sigexitnum_pd() { 2708 return NSIG; 2709} 2710 2711// a counter for each possible signal value 2712static volatile jint pending_signals[NSIG+1] = { 0 }; 2713 2714// Bsd(POSIX) specific hand shaking semaphore. 2715#ifdef __APPLE__ 2716static semaphore_t sig_sem; 2717#define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 2718#define SEM_WAIT(sem) semaphore_wait(sem); 2719#define SEM_POST(sem) semaphore_signal(sem); 2720#else 2721static sem_t sig_sem; 2722#define SEM_INIT(sem, value) sem_init(&sem, 0, value) 2723#define SEM_WAIT(sem) sem_wait(&sem); 2724#define SEM_POST(sem) sem_post(&sem); 2725#endif 2726 2727void os::signal_init_pd() { 2728 // Initialize signal structures 2729 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2730 2731 // Initialize signal semaphore 2732 ::SEM_INIT(sig_sem, 0); 2733} 2734 2735void os::signal_notify(int sig) { 2736 Atomic::inc(&pending_signals[sig]); 2737 ::SEM_POST(sig_sem); 2738} 2739 2740static int check_pending_signals(bool wait) { 2741 Atomic::store(0, &sigint_count); 2742 for (;;) { 2743 for (int i = 0; i < NSIG + 1; i++) { 2744 jint n = pending_signals[i]; 2745 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2746 return i; 2747 } 2748 } 2749 if (!wait) { 2750 return -1; 2751 } 2752 JavaThread *thread = JavaThread::current(); 2753 ThreadBlockInVM tbivm(thread); 2754 2755 bool threadIsSuspended; 2756 do { 2757 thread->set_suspend_equivalent(); 2758 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2759 ::SEM_WAIT(sig_sem); 2760 2761 // were we externally suspended while we were waiting? 2762 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2763 if (threadIsSuspended) { 2764 // 2765 // The semaphore has been incremented, but while we were waiting 2766 // another thread suspended us. We don't want to continue running 2767 // while suspended because that would surprise the thread that 2768 // suspended us. 2769 // 2770 ::SEM_POST(sig_sem); 2771 2772 thread->java_suspend_self(); 2773 } 2774 } while (threadIsSuspended); 2775 } 2776} 2777 2778int os::signal_lookup() { 2779 return check_pending_signals(false); 2780} 2781 2782int os::signal_wait() { 2783 return check_pending_signals(true); 2784} 2785 2786//////////////////////////////////////////////////////////////////////////////// 2787// Virtual Memory 2788 2789int os::vm_page_size() { 2790 // Seems redundant as all get out 2791 assert(os::Bsd::page_size() != -1, "must call os::init"); 2792 return os::Bsd::page_size(); 2793} 2794 2795// Solaris allocates memory by pages. 2796int os::vm_allocation_granularity() { 2797 assert(os::Bsd::page_size() != -1, "must call os::init"); 2798 return os::Bsd::page_size(); 2799} 2800 2801// Rationale behind this function: 2802// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2803// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2804// samples for JITted code. Here we create private executable mapping over the code cache 2805// and then we can use standard (well, almost, as mapping can change) way to provide 2806// info for the reporting script by storing timestamp and location of symbol 2807void bsd_wrap_code(char* base, size_t size) { 2808 static volatile jint cnt = 0; 2809 2810 if (!UseOprofile) { 2811 return; 2812 } 2813 2814 char buf[PATH_MAX + 1]; 2815 int num = Atomic::add(1, &cnt); 2816 2817 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2818 os::get_temp_directory(), os::current_process_id(), num); 2819 unlink(buf); 2820 2821 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2822 2823 if (fd != -1) { 2824 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2825 if (rv != (off_t)-1) { 2826 if (::write(fd, "", 1) == 1) { 2827 mmap(base, size, 2828 PROT_READ|PROT_WRITE|PROT_EXEC, 2829 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2830 } 2831 } 2832 ::close(fd); 2833 unlink(buf); 2834 } 2835} 2836 2837// NOTE: Bsd kernel does not really reserve the pages for us. 2838// All it does is to check if there are enough free pages 2839// left at the time of mmap(). This could be a potential 2840// problem. 2841bool os::commit_memory(char* addr, size_t size, bool exec) { 2842 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2843#ifdef __OpenBSD__ 2844 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2845 return ::mprotect(addr, size, prot) == 0; 2846#else 2847 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2848 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2849 return res != (uintptr_t) MAP_FAILED; 2850#endif 2851} 2852 2853#ifndef _ALLBSD_SOURCE 2854// Define MAP_HUGETLB here so we can build HotSpot on old systems. 2855#ifndef MAP_HUGETLB 2856#define MAP_HUGETLB 0x40000 2857#endif 2858 2859// Define MADV_HUGEPAGE here so we can build HotSpot on old systems. 2860#ifndef MADV_HUGEPAGE 2861#define MADV_HUGEPAGE 14 2862#endif 2863#endif 2864 2865bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 2866 bool exec) { 2867#ifndef _ALLBSD_SOURCE 2868 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { 2869 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2870 uintptr_t res = 2871 (uintptr_t) ::mmap(addr, size, prot, 2872 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, 2873 -1, 0); 2874 return res != (uintptr_t) MAP_FAILED; 2875 } 2876#endif 2877 2878 return commit_memory(addr, size, exec); 2879} 2880 2881void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2882#ifndef _ALLBSD_SOURCE 2883 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { 2884 // We don't check the return value: madvise(MADV_HUGEPAGE) may not 2885 // be supported or the memory may already be backed by huge pages. 2886 ::madvise(addr, bytes, MADV_HUGEPAGE); 2887 } 2888#endif 2889} 2890 2891void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2892 ::madvise(addr, bytes, MADV_DONTNEED); 2893} 2894 2895void os::numa_make_global(char *addr, size_t bytes) { 2896} 2897 2898void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2899} 2900 2901bool os::numa_topology_changed() { return false; } 2902 2903size_t os::numa_get_groups_num() { 2904 return 1; 2905} 2906 2907int os::numa_get_group_id() { 2908 return 0; 2909} 2910 2911size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2912 if (size > 0) { 2913 ids[0] = 0; 2914 return 1; 2915 } 2916 return 0; 2917} 2918 2919bool os::get_page_info(char *start, page_info* info) { 2920 return false; 2921} 2922 2923char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2924 return end; 2925} 2926 2927#ifndef _ALLBSD_SOURCE 2928// Something to do with the numa-aware allocator needs these symbols 2929extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } 2930extern "C" JNIEXPORT void numa_error(char *where) { } 2931extern "C" JNIEXPORT int fork1() { return fork(); } 2932 2933 2934// If we are running with libnuma version > 2, then we should 2935// be trying to use symbols with versions 1.1 2936// If we are running with earlier version, which did not have symbol versions, 2937// we should use the base version. 2938void* os::Bsd::libnuma_dlsym(void* handle, const char *name) { 2939 void *f = dlvsym(handle, name, "libnuma_1.1"); 2940 if (f == NULL) { 2941 f = dlsym(handle, name); 2942 } 2943 return f; 2944} 2945 2946bool os::Bsd::libnuma_init() { 2947 // sched_getcpu() should be in libc. 2948 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, 2949 dlsym(RTLD_DEFAULT, "sched_getcpu"))); 2950 2951 if (sched_getcpu() != -1) { // Does it work? 2952 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); 2953 if (handle != NULL) { 2954 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, 2955 libnuma_dlsym(handle, "numa_node_to_cpus"))); 2956 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, 2957 libnuma_dlsym(handle, "numa_max_node"))); 2958 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, 2959 libnuma_dlsym(handle, "numa_available"))); 2960 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, 2961 libnuma_dlsym(handle, "numa_tonode_memory"))); 2962 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, 2963 libnuma_dlsym(handle, "numa_interleave_memory"))); 2964 2965 2966 if (numa_available() != -1) { 2967 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); 2968 // Create a cpu -> node mapping 2969 _cpu_to_node = new (ResourceObj::C_HEAP) GrowableArray<int>(0, true); 2970 rebuild_cpu_to_node_map(); 2971 return true; 2972 } 2973 } 2974 } 2975 return false; 2976} 2977 2978// rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. 2979// The table is later used in get_node_by_cpu(). 2980void os::Bsd::rebuild_cpu_to_node_map() { 2981 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure 2982 // in libnuma (possible values are starting from 16, 2983 // and continuing up with every other power of 2, but less 2984 // than the maximum number of CPUs supported by kernel), and 2985 // is a subject to change (in libnuma version 2 the requirements 2986 // are more reasonable) we'll just hardcode the number they use 2987 // in the library. 2988 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; 2989 2990 size_t cpu_num = os::active_processor_count(); 2991 size_t cpu_map_size = NCPUS / BitsPerCLong; 2992 size_t cpu_map_valid_size = 2993 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); 2994 2995 cpu_to_node()->clear(); 2996 cpu_to_node()->at_grow(cpu_num - 1); 2997 size_t node_num = numa_get_groups_num(); 2998 2999 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size); 3000 for (size_t i = 0; i < node_num; i++) { 3001 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { 3002 for (size_t j = 0; j < cpu_map_valid_size; j++) { 3003 if (cpu_map[j] != 0) { 3004 for (size_t k = 0; k < BitsPerCLong; k++) { 3005 if (cpu_map[j] & (1UL << k)) { 3006 cpu_to_node()->at_put(j * BitsPerCLong + k, i); 3007 } 3008 } 3009 } 3010 } 3011 } 3012 } 3013 FREE_C_HEAP_ARRAY(unsigned long, cpu_map); 3014} 3015 3016int os::Bsd::get_node_by_cpu(int cpu_id) { 3017 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { 3018 return cpu_to_node()->at(cpu_id); 3019 } 3020 return -1; 3021} 3022 3023GrowableArray<int>* os::Bsd::_cpu_to_node; 3024os::Bsd::sched_getcpu_func_t os::Bsd::_sched_getcpu; 3025os::Bsd::numa_node_to_cpus_func_t os::Bsd::_numa_node_to_cpus; 3026os::Bsd::numa_max_node_func_t os::Bsd::_numa_max_node; 3027os::Bsd::numa_available_func_t os::Bsd::_numa_available; 3028os::Bsd::numa_tonode_memory_func_t os::Bsd::_numa_tonode_memory; 3029os::Bsd::numa_interleave_memory_func_t os::Bsd::_numa_interleave_memory; 3030unsigned long* os::Bsd::_numa_all_nodes; 3031#endif 3032 3033bool os::uncommit_memory(char* addr, size_t size) { 3034#ifdef __OpenBSD__ 3035 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 3036 return ::mprotect(addr, size, PROT_NONE) == 0; 3037#else 3038 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 3039 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 3040 return res != (uintptr_t) MAP_FAILED; 3041#endif 3042} 3043 3044bool os::create_stack_guard_pages(char* addr, size_t size) { 3045 return os::commit_memory(addr, size); 3046} 3047 3048// If this is a growable mapping, remove the guard pages entirely by 3049// munmap()ping them. If not, just call uncommit_memory(). 3050bool os::remove_stack_guard_pages(char* addr, size_t size) { 3051 return os::uncommit_memory(addr, size); 3052} 3053 3054static address _highest_vm_reserved_address = NULL; 3055 3056// If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 3057// at 'requested_addr'. If there are existing memory mappings at the same 3058// location, however, they will be overwritten. If 'fixed' is false, 3059// 'requested_addr' is only treated as a hint, the return value may or 3060// may not start from the requested address. Unlike Bsd mmap(), this 3061// function returns NULL to indicate failure. 3062static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 3063 char * addr; 3064 int flags; 3065 3066 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 3067 if (fixed) { 3068 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 3069 flags |= MAP_FIXED; 3070 } 3071 3072 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 3073 // to PROT_EXEC if executable when we commit the page. 3074 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 3075 flags, -1, 0); 3076 3077 if (addr != MAP_FAILED) { 3078 // anon_mmap() should only get called during VM initialization, 3079 // don't need lock (actually we can skip locking even it can be called 3080 // from multiple threads, because _highest_vm_reserved_address is just a 3081 // hint about the upper limit of non-stack memory regions.) 3082 if ((address)addr + bytes > _highest_vm_reserved_address) { 3083 _highest_vm_reserved_address = (address)addr + bytes; 3084 } 3085 } 3086 3087 return addr == MAP_FAILED ? NULL : addr; 3088} 3089 3090// Don't update _highest_vm_reserved_address, because there might be memory 3091// regions above addr + size. If so, releasing a memory region only creates 3092// a hole in the address space, it doesn't help prevent heap-stack collision. 3093// 3094static int anon_munmap(char * addr, size_t size) { 3095 return ::munmap(addr, size) == 0; 3096} 3097 3098char* os::reserve_memory(size_t bytes, char* requested_addr, 3099 size_t alignment_hint) { 3100 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 3101} 3102 3103bool os::release_memory(char* addr, size_t size) { 3104 return anon_munmap(addr, size); 3105} 3106 3107static address highest_vm_reserved_address() { 3108 return _highest_vm_reserved_address; 3109} 3110 3111static bool bsd_mprotect(char* addr, size_t size, int prot) { 3112 // Bsd wants the mprotect address argument to be page aligned. 3113 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 3114 3115 // According to SUSv3, mprotect() should only be used with mappings 3116 // established by mmap(), and mmap() always maps whole pages. Unaligned 3117 // 'addr' likely indicates problem in the VM (e.g. trying to change 3118 // protection of malloc'ed or statically allocated memory). Check the 3119 // caller if you hit this assert. 3120 assert(addr == bottom, "sanity check"); 3121 3122 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 3123 return ::mprotect(bottom, size, prot) == 0; 3124} 3125 3126// Set protections specified 3127bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3128 bool is_committed) { 3129 unsigned int p = 0; 3130 switch (prot) { 3131 case MEM_PROT_NONE: p = PROT_NONE; break; 3132 case MEM_PROT_READ: p = PROT_READ; break; 3133 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3134 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3135 default: 3136 ShouldNotReachHere(); 3137 } 3138 // is_committed is unused. 3139 return bsd_mprotect(addr, bytes, p); 3140} 3141 3142bool os::guard_memory(char* addr, size_t size) { 3143 return bsd_mprotect(addr, size, PROT_NONE); 3144} 3145 3146bool os::unguard_memory(char* addr, size_t size) { 3147 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 3148} 3149 3150bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 3151 bool result = false; 3152#ifndef _ALLBSD_SOURCE 3153 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, 3154 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, 3155 -1, 0); 3156 3157 if (p != (void *) -1) { 3158 // We don't know if this really is a huge page or not. 3159 FILE *fp = fopen("/proc/self/maps", "r"); 3160 if (fp) { 3161 while (!feof(fp)) { 3162 char chars[257]; 3163 long x = 0; 3164 if (fgets(chars, sizeof(chars), fp)) { 3165 if (sscanf(chars, "%lx-%*x", &x) == 1 3166 && x == (long)p) { 3167 if (strstr (chars, "hugepage")) { 3168 result = true; 3169 break; 3170 } 3171 } 3172 } 3173 } 3174 fclose(fp); 3175 } 3176 munmap (p, page_size); 3177 if (result) 3178 return true; 3179 } 3180 3181 if (warn) { 3182 warning("HugeTLBFS is not supported by the operating system."); 3183 } 3184#endif 3185 3186 return result; 3187} 3188 3189/* 3190* Set the coredump_filter bits to include largepages in core dump (bit 6) 3191* 3192* From the coredump_filter documentation: 3193* 3194* - (bit 0) anonymous private memory 3195* - (bit 1) anonymous shared memory 3196* - (bit 2) file-backed private memory 3197* - (bit 3) file-backed shared memory 3198* - (bit 4) ELF header pages in file-backed private memory areas (it is 3199* effective only if the bit 2 is cleared) 3200* - (bit 5) hugetlb private memory 3201* - (bit 6) hugetlb shared memory 3202*/ 3203static void set_coredump_filter(void) { 3204 FILE *f; 3205 long cdm; 3206 3207 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { 3208 return; 3209 } 3210 3211 if (fscanf(f, "%lx", &cdm) != 1) { 3212 fclose(f); 3213 return; 3214 } 3215 3216 rewind(f); 3217 3218 if ((cdm & LARGEPAGES_BIT) == 0) { 3219 cdm |= LARGEPAGES_BIT; 3220 fprintf(f, "%#lx", cdm); 3221 } 3222 3223 fclose(f); 3224} 3225 3226// Large page support 3227 3228static size_t _large_page_size = 0; 3229 3230void os::large_page_init() { 3231#ifndef _ALLBSD_SOURCE 3232 if (!UseLargePages) { 3233 UseHugeTLBFS = false; 3234 UseSHM = false; 3235 return; 3236 } 3237 3238 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { 3239 // If UseLargePages is specified on the command line try both methods, 3240 // if it's default, then try only HugeTLBFS. 3241 if (FLAG_IS_DEFAULT(UseLargePages)) { 3242 UseHugeTLBFS = true; 3243 } else { 3244 UseHugeTLBFS = UseSHM = true; 3245 } 3246 } 3247 3248 if (LargePageSizeInBytes) { 3249 _large_page_size = LargePageSizeInBytes; 3250 } else { 3251 // large_page_size on Bsd is used to round up heap size. x86 uses either 3252 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) 3253 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use 3254 // page as large as 256M. 3255 // 3256 // Here we try to figure out page size by parsing /proc/meminfo and looking 3257 // for a line with the following format: 3258 // Hugepagesize: 2048 kB 3259 // 3260 // If we can't determine the value (e.g. /proc is not mounted, or the text 3261 // format has been changed), we'll use the largest page size supported by 3262 // the processor. 3263 3264#ifndef ZERO 3265 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) 3266 ARM_ONLY(2 * M) PPC_ONLY(4 * M); 3267#endif // ZERO 3268 3269 FILE *fp = fopen("/proc/meminfo", "r"); 3270 if (fp) { 3271 while (!feof(fp)) { 3272 int x = 0; 3273 char buf[16]; 3274 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { 3275 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { 3276 _large_page_size = x * K; 3277 break; 3278 } 3279 } else { 3280 // skip to next line 3281 for (;;) { 3282 int ch = fgetc(fp); 3283 if (ch == EOF || ch == (int)'\n') break; 3284 } 3285 } 3286 } 3287 fclose(fp); 3288 } 3289 } 3290 3291 // print a warning if any large page related flag is specified on command line 3292 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); 3293 3294 const size_t default_page_size = (size_t)Bsd::page_size(); 3295 if (_large_page_size > default_page_size) { 3296 _page_sizes[0] = _large_page_size; 3297 _page_sizes[1] = default_page_size; 3298 _page_sizes[2] = 0; 3299 } 3300 UseHugeTLBFS = UseHugeTLBFS && 3301 Bsd::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); 3302 3303 if (UseHugeTLBFS) 3304 UseSHM = false; 3305 3306 UseLargePages = UseHugeTLBFS || UseSHM; 3307 3308 set_coredump_filter(); 3309#endif 3310} 3311 3312#ifndef _ALLBSD_SOURCE 3313#ifndef SHM_HUGETLB 3314#define SHM_HUGETLB 04000 3315#endif 3316#endif 3317 3318char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 3319 // "exec" is passed in but not used. Creating the shared image for 3320 // the code cache doesn't have an SHM_X executable permission to check. 3321 assert(UseLargePages && UseSHM, "only for SHM large pages"); 3322 3323 key_t key = IPC_PRIVATE; 3324 char *addr; 3325 3326 bool warn_on_failure = UseLargePages && 3327 (!FLAG_IS_DEFAULT(UseLargePages) || 3328 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3329 ); 3330 char msg[128]; 3331 3332 // Create a large shared memory region to attach to based on size. 3333 // Currently, size is the total size of the heap 3334#ifndef _ALLBSD_SOURCE 3335 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); 3336#else 3337 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 3338#endif 3339 if (shmid == -1) { 3340 // Possible reasons for shmget failure: 3341 // 1. shmmax is too small for Java heap. 3342 // > check shmmax value: cat /proc/sys/kernel/shmmax 3343 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 3344 // 2. not enough large page memory. 3345 // > check available large pages: cat /proc/meminfo 3346 // > increase amount of large pages: 3347 // echo new_value > /proc/sys/vm/nr_hugepages 3348 // Note 1: different Bsd may use different name for this property, 3349 // e.g. on Redhat AS-3 it is "hugetlb_pool". 3350 // Note 2: it's possible there's enough physical memory available but 3351 // they are so fragmented after a long run that they can't 3352 // coalesce into large pages. Try to reserve large pages when 3353 // the system is still "fresh". 3354 if (warn_on_failure) { 3355 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3356 warning(msg); 3357 } 3358 return NULL; 3359 } 3360 3361 // attach to the region 3362 addr = (char*)shmat(shmid, req_addr, 0); 3363 int err = errno; 3364 3365 // Remove shmid. If shmat() is successful, the actual shared memory segment 3366 // will be deleted when it's detached by shmdt() or when the process 3367 // terminates. If shmat() is not successful this will remove the shared 3368 // segment immediately. 3369 shmctl(shmid, IPC_RMID, NULL); 3370 3371 if ((intptr_t)addr == -1) { 3372 if (warn_on_failure) { 3373 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3374 warning(msg); 3375 } 3376 return NULL; 3377 } 3378 3379 return addr; 3380} 3381 3382bool os::release_memory_special(char* base, size_t bytes) { 3383 // detaching the SHM segment will also delete it, see reserve_memory_special() 3384 int rslt = shmdt(base); 3385 return rslt == 0; 3386} 3387 3388size_t os::large_page_size() { 3389 return _large_page_size; 3390} 3391 3392// HugeTLBFS allows application to commit large page memory on demand; 3393// with SysV SHM the entire memory region must be allocated as shared 3394// memory. 3395bool os::can_commit_large_page_memory() { 3396 return UseHugeTLBFS; 3397} 3398 3399bool os::can_execute_large_page_memory() { 3400 return UseHugeTLBFS; 3401} 3402 3403// Reserve memory at an arbitrary address, only if that area is 3404// available (and not reserved for something else). 3405 3406char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3407 const int max_tries = 10; 3408 char* base[max_tries]; 3409 size_t size[max_tries]; 3410 const size_t gap = 0x000000; 3411 3412 // Assert only that the size is a multiple of the page size, since 3413 // that's all that mmap requires, and since that's all we really know 3414 // about at this low abstraction level. If we need higher alignment, 3415 // we can either pass an alignment to this method or verify alignment 3416 // in one of the methods further up the call chain. See bug 5044738. 3417 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3418 3419 // Repeatedly allocate blocks until the block is allocated at the 3420 // right spot. Give up after max_tries. Note that reserve_memory() will 3421 // automatically update _highest_vm_reserved_address if the call is 3422 // successful. The variable tracks the highest memory address every reserved 3423 // by JVM. It is used to detect heap-stack collision if running with 3424 // fixed-stack BsdThreads. Because here we may attempt to reserve more 3425 // space than needed, it could confuse the collision detecting code. To 3426 // solve the problem, save current _highest_vm_reserved_address and 3427 // calculate the correct value before return. 3428 address old_highest = _highest_vm_reserved_address; 3429 3430 // Bsd mmap allows caller to pass an address as hint; give it a try first, 3431 // if kernel honors the hint then we can return immediately. 3432 char * addr = anon_mmap(requested_addr, bytes, false); 3433 if (addr == requested_addr) { 3434 return requested_addr; 3435 } 3436 3437 if (addr != NULL) { 3438 // mmap() is successful but it fails to reserve at the requested address 3439 anon_munmap(addr, bytes); 3440 } 3441 3442 int i; 3443 for (i = 0; i < max_tries; ++i) { 3444 base[i] = reserve_memory(bytes); 3445 3446 if (base[i] != NULL) { 3447 // Is this the block we wanted? 3448 if (base[i] == requested_addr) { 3449 size[i] = bytes; 3450 break; 3451 } 3452 3453 // Does this overlap the block we wanted? Give back the overlapped 3454 // parts and try again. 3455 3456 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3457 if (top_overlap >= 0 && top_overlap < bytes) { 3458 unmap_memory(base[i], top_overlap); 3459 base[i] += top_overlap; 3460 size[i] = bytes - top_overlap; 3461 } else { 3462 size_t bottom_overlap = base[i] + bytes - requested_addr; 3463 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3464 unmap_memory(requested_addr, bottom_overlap); 3465 size[i] = bytes - bottom_overlap; 3466 } else { 3467 size[i] = bytes; 3468 } 3469 } 3470 } 3471 } 3472 3473 // Give back the unused reserved pieces. 3474 3475 for (int j = 0; j < i; ++j) { 3476 if (base[j] != NULL) { 3477 unmap_memory(base[j], size[j]); 3478 } 3479 } 3480 3481 if (i < max_tries) { 3482 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 3483 return requested_addr; 3484 } else { 3485 _highest_vm_reserved_address = old_highest; 3486 return NULL; 3487 } 3488} 3489 3490size_t os::read(int fd, void *buf, unsigned int nBytes) { 3491 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 3492} 3493 3494// TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 3495// Solaris uses poll(), bsd uses park(). 3496// Poll() is likely a better choice, assuming that Thread.interrupt() 3497// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 3498// SIGSEGV, see 4355769. 3499 3500int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3501 assert(thread == Thread::current(), "thread consistency check"); 3502 3503 ParkEvent * const slp = thread->_SleepEvent ; 3504 slp->reset() ; 3505 OrderAccess::fence() ; 3506 3507 if (interruptible) { 3508 jlong prevtime = javaTimeNanos(); 3509 3510 for (;;) { 3511 if (os::is_interrupted(thread, true)) { 3512 return OS_INTRPT; 3513 } 3514 3515 jlong newtime = javaTimeNanos(); 3516 3517 if (newtime - prevtime < 0) { 3518 // time moving backwards, should only happen if no monotonic clock 3519 // not a guarantee() because JVM should not abort on kernel/glibc bugs 3520 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 3521 } else { 3522 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 3523 } 3524 3525 if(millis <= 0) { 3526 return OS_OK; 3527 } 3528 3529 prevtime = newtime; 3530 3531 { 3532 assert(thread->is_Java_thread(), "sanity check"); 3533 JavaThread *jt = (JavaThread *) thread; 3534 ThreadBlockInVM tbivm(jt); 3535 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3536 3537 jt->set_suspend_equivalent(); 3538 // cleared by handle_special_suspend_equivalent_condition() or 3539 // java_suspend_self() via check_and_wait_while_suspended() 3540 3541 slp->park(millis); 3542 3543 // were we externally suspended while we were waiting? 3544 jt->check_and_wait_while_suspended(); 3545 } 3546 } 3547 } else { 3548 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3549 jlong prevtime = javaTimeNanos(); 3550 3551 for (;;) { 3552 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 3553 // the 1st iteration ... 3554 jlong newtime = javaTimeNanos(); 3555 3556 if (newtime - prevtime < 0) { 3557 // time moving backwards, should only happen if no monotonic clock 3558 // not a guarantee() because JVM should not abort on kernel/glibc bugs 3559 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 3560 } else { 3561 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 3562 } 3563 3564 if(millis <= 0) break ; 3565 3566 prevtime = newtime; 3567 slp->park(millis); 3568 } 3569 return OS_OK ; 3570 } 3571} 3572 3573int os::naked_sleep() { 3574 // %% make the sleep time an integer flag. for now use 1 millisec. 3575 return os::sleep(Thread::current(), 1, false); 3576} 3577 3578// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3579void os::infinite_sleep() { 3580 while (true) { // sleep forever ... 3581 ::sleep(100); // ... 100 seconds at a time 3582 } 3583} 3584 3585// Used to convert frequent JVM_Yield() to nops 3586bool os::dont_yield() { 3587 return DontYieldALot; 3588} 3589 3590void os::yield() { 3591 sched_yield(); 3592} 3593 3594os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 3595 3596void os::yield_all(int attempts) { 3597 // Yields to all threads, including threads with lower priorities 3598 // Threads on Bsd are all with same priority. The Solaris style 3599 // os::yield_all() with nanosleep(1ms) is not necessary. 3600 sched_yield(); 3601} 3602 3603// Called from the tight loops to possibly influence time-sharing heuristics 3604void os::loop_breaker(int attempts) { 3605 os::yield_all(attempts); 3606} 3607 3608//////////////////////////////////////////////////////////////////////////////// 3609// thread priority support 3610 3611// Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 3612// only supports dynamic priority, static priority must be zero. For real-time 3613// applications, Bsd supports SCHED_RR which allows static priority (1-99). 3614// However, for large multi-threaded applications, SCHED_RR is not only slower 3615// than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 3616// of 5 runs - Sep 2005). 3617// 3618// The following code actually changes the niceness of kernel-thread/LWP. It 3619// has an assumption that setpriority() only modifies one kernel-thread/LWP, 3620// not the entire user process, and user level threads are 1:1 mapped to kernel 3621// threads. It has always been the case, but could change in the future. For 3622// this reason, the code should not be used as default (ThreadPriorityPolicy=0). 3623// It is only used when ThreadPriorityPolicy=1 and requires root privilege. 3624 3625#if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) 3626int os::java_to_os_priority[CriticalPriority + 1] = { 3627 19, // 0 Entry should never be used 3628 3629 0, // 1 MinPriority 3630 3, // 2 3631 6, // 3 3632 3633 10, // 4 3634 15, // 5 NormPriority 3635 18, // 6 3636 3637 21, // 7 3638 25, // 8 3639 28, // 9 NearMaxPriority 3640 3641 31, // 10 MaxPriority 3642 3643 31 // 11 CriticalPriority 3644}; 3645#elif defined(__APPLE__) 3646/* Using Mach high-level priority assignments */ 3647int os::java_to_os_priority[CriticalPriority + 1] = { 3648 0, // 0 Entry should never be used (MINPRI_USER) 3649 3650 27, // 1 MinPriority 3651 28, // 2 3652 29, // 3 3653 3654 30, // 4 3655 31, // 5 NormPriority (BASEPRI_DEFAULT) 3656 32, // 6 3657 3658 33, // 7 3659 34, // 8 3660 35, // 9 NearMaxPriority 3661 3662 36, // 10 MaxPriority 3663 3664 36 // 11 CriticalPriority 3665}; 3666#else 3667int os::java_to_os_priority[CriticalPriority + 1] = { 3668 19, // 0 Entry should never be used 3669 3670 4, // 1 MinPriority 3671 3, // 2 3672 2, // 3 3673 3674 1, // 4 3675 0, // 5 NormPriority 3676 -1, // 6 3677 3678 -2, // 7 3679 -3, // 8 3680 -4, // 9 NearMaxPriority 3681 3682 -5, // 10 MaxPriority 3683 3684 -5 // 11 CriticalPriority 3685}; 3686#endif 3687 3688static int prio_init() { 3689 if (ThreadPriorityPolicy == 1) { 3690 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 3691 // if effective uid is not root. Perhaps, a more elegant way of doing 3692 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 3693 if (geteuid() != 0) { 3694 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 3695 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 3696 } 3697 ThreadPriorityPolicy = 0; 3698 } 3699 } 3700 if (UseCriticalJavaThreadPriority) { 3701 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3702 } 3703 return 0; 3704} 3705 3706OSReturn os::set_native_priority(Thread* thread, int newpri) { 3707 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 3708 3709#ifdef __OpenBSD__ 3710 // OpenBSD pthread_setprio starves low priority threads 3711 return OS_OK; 3712#elif defined(__FreeBSD__) 3713 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 3714#elif defined(__APPLE__) || defined(__NetBSD__) 3715 struct sched_param sp; 3716 int policy; 3717 pthread_t self = pthread_self(); 3718 3719 if (pthread_getschedparam(self, &policy, &sp) != 0) 3720 return OS_ERR; 3721 3722 sp.sched_priority = newpri; 3723 if (pthread_setschedparam(self, policy, &sp) != 0) 3724 return OS_ERR; 3725 3726 return OS_OK; 3727#else 3728 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 3729 return (ret == 0) ? OS_OK : OS_ERR; 3730#endif 3731} 3732 3733OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 3734 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 3735 *priority_ptr = java_to_os_priority[NormPriority]; 3736 return OS_OK; 3737 } 3738 3739 errno = 0; 3740#if defined(__OpenBSD__) || defined(__FreeBSD__) 3741 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 3742#elif defined(__APPLE__) || defined(__NetBSD__) 3743 int policy; 3744 struct sched_param sp; 3745 3746 pthread_getschedparam(pthread_self(), &policy, &sp); 3747 *priority_ptr = sp.sched_priority; 3748#else 3749 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 3750#endif 3751 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 3752} 3753 3754// Hint to the underlying OS that a task switch would not be good. 3755// Void return because it's a hint and can fail. 3756void os::hint_no_preempt() {} 3757 3758//////////////////////////////////////////////////////////////////////////////// 3759// suspend/resume support 3760 3761// the low-level signal-based suspend/resume support is a remnant from the 3762// old VM-suspension that used to be for java-suspension, safepoints etc, 3763// within hotspot. Now there is a single use-case for this: 3764// - calling get_thread_pc() on the VMThread by the flat-profiler task 3765// that runs in the watcher thread. 3766// The remaining code is greatly simplified from the more general suspension 3767// code that used to be used. 3768// 3769// The protocol is quite simple: 3770// - suspend: 3771// - sends a signal to the target thread 3772// - polls the suspend state of the osthread using a yield loop 3773// - target thread signal handler (SR_handler) sets suspend state 3774// and blocks in sigsuspend until continued 3775// - resume: 3776// - sets target osthread state to continue 3777// - sends signal to end the sigsuspend loop in the SR_handler 3778// 3779// Note that the SR_lock plays no role in this suspend/resume protocol. 3780// 3781 3782static void resume_clear_context(OSThread *osthread) { 3783 osthread->set_ucontext(NULL); 3784 osthread->set_siginfo(NULL); 3785 3786 // notify the suspend action is completed, we have now resumed 3787 osthread->sr.clear_suspended(); 3788} 3789 3790static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 3791 osthread->set_ucontext(context); 3792 osthread->set_siginfo(siginfo); 3793} 3794 3795// 3796// Handler function invoked when a thread's execution is suspended or 3797// resumed. We have to be careful that only async-safe functions are 3798// called here (Note: most pthread functions are not async safe and 3799// should be avoided.) 3800// 3801// Note: sigwait() is a more natural fit than sigsuspend() from an 3802// interface point of view, but sigwait() prevents the signal hander 3803// from being run. libpthread would get very confused by not having 3804// its signal handlers run and prevents sigwait()'s use with the 3805// mutex granting granting signal. 3806// 3807// Currently only ever called on the VMThread 3808// 3809static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 3810 // Save and restore errno to avoid confusing native code with EINTR 3811 // after sigsuspend. 3812 int old_errno = errno; 3813 3814 Thread* thread = Thread::current(); 3815 OSThread* osthread = thread->osthread(); 3816 assert(thread->is_VM_thread(), "Must be VMThread"); 3817 // read current suspend action 3818 int action = osthread->sr.suspend_action(); 3819 if (action == SR_SUSPEND) { 3820 suspend_save_context(osthread, siginfo, context); 3821 3822 // Notify the suspend action is about to be completed. do_suspend() 3823 // waits until SR_SUSPENDED is set and then returns. We will wait 3824 // here for a resume signal and that completes the suspend-other 3825 // action. do_suspend/do_resume is always called as a pair from 3826 // the same thread - so there are no races 3827 3828 // notify the caller 3829 osthread->sr.set_suspended(); 3830 3831 sigset_t suspend_set; // signals for sigsuspend() 3832 3833 // get current set of blocked signals and unblock resume signal 3834 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3835 sigdelset(&suspend_set, SR_signum); 3836 3837 // wait here until we are resumed 3838 do { 3839 sigsuspend(&suspend_set); 3840 // ignore all returns until we get a resume signal 3841 } while (osthread->sr.suspend_action() != SR_CONTINUE); 3842 3843 resume_clear_context(osthread); 3844 3845 } else { 3846 assert(action == SR_CONTINUE, "unexpected sr action"); 3847 // nothing special to do - just leave the handler 3848 } 3849 3850 errno = old_errno; 3851} 3852 3853 3854static int SR_initialize() { 3855 struct sigaction act; 3856 char *s; 3857 /* Get signal number to use for suspend/resume */ 3858 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 3859 int sig = ::strtol(s, 0, 10); 3860 if (sig > 0 || sig < NSIG) { 3861 SR_signum = sig; 3862 } 3863 } 3864 3865 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 3866 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 3867 3868 sigemptyset(&SR_sigset); 3869 sigaddset(&SR_sigset, SR_signum); 3870 3871 /* Set up signal handler for suspend/resume */ 3872 act.sa_flags = SA_RESTART|SA_SIGINFO; 3873 act.sa_handler = (void (*)(int)) SR_handler; 3874 3875 // SR_signum is blocked by default. 3876 // 4528190 - We also need to block pthread restart signal (32 on all 3877 // supported Bsd platforms). Note that BsdThreads need to block 3878 // this signal for all threads to work properly. So we don't have 3879 // to use hard-coded signal number when setting up the mask. 3880 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 3881 3882 if (sigaction(SR_signum, &act, 0) == -1) { 3883 return -1; 3884 } 3885 3886 // Save signal flag 3887 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 3888 return 0; 3889} 3890 3891static int SR_finalize() { 3892 return 0; 3893} 3894 3895 3896// returns true on success and false on error - really an error is fatal 3897// but this seems the normal response to library errors 3898static bool do_suspend(OSThread* osthread) { 3899 // mark as suspended and send signal 3900 osthread->sr.set_suspend_action(SR_SUSPEND); 3901 int status = pthread_kill(osthread->pthread_id(), SR_signum); 3902 assert_status(status == 0, status, "pthread_kill"); 3903 3904 // check status and wait until notified of suspension 3905 if (status == 0) { 3906 for (int i = 0; !osthread->sr.is_suspended(); i++) { 3907 os::yield_all(i); 3908 } 3909 osthread->sr.set_suspend_action(SR_NONE); 3910 return true; 3911 } 3912 else { 3913 osthread->sr.set_suspend_action(SR_NONE); 3914 return false; 3915 } 3916} 3917 3918static void do_resume(OSThread* osthread) { 3919 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3920 osthread->sr.set_suspend_action(SR_CONTINUE); 3921 3922 int status = pthread_kill(osthread->pthread_id(), SR_signum); 3923 assert_status(status == 0, status, "pthread_kill"); 3924 // check status and wait unit notified of resumption 3925 if (status == 0) { 3926 for (int i = 0; osthread->sr.is_suspended(); i++) { 3927 os::yield_all(i); 3928 } 3929 } 3930 osthread->sr.set_suspend_action(SR_NONE); 3931} 3932 3933//////////////////////////////////////////////////////////////////////////////// 3934// interrupt support 3935 3936void os::interrupt(Thread* thread) { 3937 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3938 "possibility of dangling Thread pointer"); 3939 3940 OSThread* osthread = thread->osthread(); 3941 3942 if (!osthread->interrupted()) { 3943 osthread->set_interrupted(true); 3944 // More than one thread can get here with the same value of osthread, 3945 // resulting in multiple notifications. We do, however, want the store 3946 // to interrupted() to be visible to other threads before we execute unpark(). 3947 OrderAccess::fence(); 3948 ParkEvent * const slp = thread->_SleepEvent ; 3949 if (slp != NULL) slp->unpark() ; 3950 } 3951 3952 // For JSR166. Unpark even if interrupt status already was set 3953 if (thread->is_Java_thread()) 3954 ((JavaThread*)thread)->parker()->unpark(); 3955 3956 ParkEvent * ev = thread->_ParkEvent ; 3957 if (ev != NULL) ev->unpark() ; 3958 3959} 3960 3961bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3962 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3963 "possibility of dangling Thread pointer"); 3964 3965 OSThread* osthread = thread->osthread(); 3966 3967 bool interrupted = osthread->interrupted(); 3968 3969 if (interrupted && clear_interrupted) { 3970 osthread->set_interrupted(false); 3971 // consider thread->_SleepEvent->reset() ... optional optimization 3972 } 3973 3974 return interrupted; 3975} 3976 3977/////////////////////////////////////////////////////////////////////////////////// 3978// signal handling (except suspend/resume) 3979 3980// This routine may be used by user applications as a "hook" to catch signals. 3981// The user-defined signal handler must pass unrecognized signals to this 3982// routine, and if it returns true (non-zero), then the signal handler must 3983// return immediately. If the flag "abort_if_unrecognized" is true, then this 3984// routine will never retun false (zero), but instead will execute a VM panic 3985// routine kill the process. 3986// 3987// If this routine returns false, it is OK to call it again. This allows 3988// the user-defined signal handler to perform checks either before or after 3989// the VM performs its own checks. Naturally, the user code would be making 3990// a serious error if it tried to handle an exception (such as a null check 3991// or breakpoint) that the VM was generating for its own correct operation. 3992// 3993// This routine may recognize any of the following kinds of signals: 3994// SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 3995// It should be consulted by handlers for any of those signals. 3996// 3997// The caller of this routine must pass in the three arguments supplied 3998// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3999// field of the structure passed to sigaction(). This routine assumes that 4000// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 4001// 4002// Note that the VM will print warnings if it detects conflicting signal 4003// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 4004// 4005extern "C" JNIEXPORT int 4006JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 4007 void* ucontext, int abort_if_unrecognized); 4008 4009void signalHandler(int sig, siginfo_t* info, void* uc) { 4010 assert(info != NULL && uc != NULL, "it must be old kernel"); 4011 JVM_handle_bsd_signal(sig, info, uc, true); 4012} 4013 4014 4015// This boolean allows users to forward their own non-matching signals 4016// to JVM_handle_bsd_signal, harmlessly. 4017bool os::Bsd::signal_handlers_are_installed = false; 4018 4019// For signal-chaining 4020struct sigaction os::Bsd::sigact[MAXSIGNUM]; 4021unsigned int os::Bsd::sigs = 0; 4022bool os::Bsd::libjsig_is_loaded = false; 4023typedef struct sigaction *(*get_signal_t)(int); 4024get_signal_t os::Bsd::get_signal_action = NULL; 4025 4026struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 4027 struct sigaction *actp = NULL; 4028 4029 if (libjsig_is_loaded) { 4030 // Retrieve the old signal handler from libjsig 4031 actp = (*get_signal_action)(sig); 4032 } 4033 if (actp == NULL) { 4034 // Retrieve the preinstalled signal handler from jvm 4035 actp = get_preinstalled_handler(sig); 4036 } 4037 4038 return actp; 4039} 4040 4041static bool call_chained_handler(struct sigaction *actp, int sig, 4042 siginfo_t *siginfo, void *context) { 4043 // Call the old signal handler 4044 if (actp->sa_handler == SIG_DFL) { 4045 // It's more reasonable to let jvm treat it as an unexpected exception 4046 // instead of taking the default action. 4047 return false; 4048 } else if (actp->sa_handler != SIG_IGN) { 4049 if ((actp->sa_flags & SA_NODEFER) == 0) { 4050 // automaticlly block the signal 4051 sigaddset(&(actp->sa_mask), sig); 4052 } 4053 4054 sa_handler_t hand; 4055 sa_sigaction_t sa; 4056 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4057 // retrieve the chained handler 4058 if (siginfo_flag_set) { 4059 sa = actp->sa_sigaction; 4060 } else { 4061 hand = actp->sa_handler; 4062 } 4063 4064 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4065 actp->sa_handler = SIG_DFL; 4066 } 4067 4068 // try to honor the signal mask 4069 sigset_t oset; 4070 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4071 4072 // call into the chained handler 4073 if (siginfo_flag_set) { 4074 (*sa)(sig, siginfo, context); 4075 } else { 4076 (*hand)(sig); 4077 } 4078 4079 // restore the signal mask 4080 pthread_sigmask(SIG_SETMASK, &oset, 0); 4081 } 4082 // Tell jvm's signal handler the signal is taken care of. 4083 return true; 4084} 4085 4086bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4087 bool chained = false; 4088 // signal-chaining 4089 if (UseSignalChaining) { 4090 struct sigaction *actp = get_chained_signal_action(sig); 4091 if (actp != NULL) { 4092 chained = call_chained_handler(actp, sig, siginfo, context); 4093 } 4094 } 4095 return chained; 4096} 4097 4098struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 4099 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 4100 return &sigact[sig]; 4101 } 4102 return NULL; 4103} 4104 4105void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4106 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4107 sigact[sig] = oldAct; 4108 sigs |= (unsigned int)1 << sig; 4109} 4110 4111// for diagnostic 4112int os::Bsd::sigflags[MAXSIGNUM]; 4113 4114int os::Bsd::get_our_sigflags(int sig) { 4115 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4116 return sigflags[sig]; 4117} 4118 4119void os::Bsd::set_our_sigflags(int sig, int flags) { 4120 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4121 sigflags[sig] = flags; 4122} 4123 4124void os::Bsd::set_signal_handler(int sig, bool set_installed) { 4125 // Check for overwrite. 4126 struct sigaction oldAct; 4127 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4128 4129 void* oldhand = oldAct.sa_sigaction 4130 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4131 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4132 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4133 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4134 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 4135 if (AllowUserSignalHandlers || !set_installed) { 4136 // Do not overwrite; user takes responsibility to forward to us. 4137 return; 4138 } else if (UseSignalChaining) { 4139 // save the old handler in jvm 4140 save_preinstalled_handler(sig, oldAct); 4141 // libjsig also interposes the sigaction() call below and saves the 4142 // old sigaction on it own. 4143 } else { 4144 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4145 "%#lx for signal %d.", (long)oldhand, sig)); 4146 } 4147 } 4148 4149 struct sigaction sigAct; 4150 sigfillset(&(sigAct.sa_mask)); 4151 sigAct.sa_handler = SIG_DFL; 4152 if (!set_installed) { 4153 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 4154 } else { 4155 sigAct.sa_sigaction = signalHandler; 4156 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 4157 } 4158 // Save flags, which are set by ours 4159 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 4160 sigflags[sig] = sigAct.sa_flags; 4161 4162 int ret = sigaction(sig, &sigAct, &oldAct); 4163 assert(ret == 0, "check"); 4164 4165 void* oldhand2 = oldAct.sa_sigaction 4166 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4167 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4168 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4169} 4170 4171// install signal handlers for signals that HotSpot needs to 4172// handle in order to support Java-level exception handling. 4173 4174void os::Bsd::install_signal_handlers() { 4175 if (!signal_handlers_are_installed) { 4176 signal_handlers_are_installed = true; 4177 4178 // signal-chaining 4179 typedef void (*signal_setting_t)(); 4180 signal_setting_t begin_signal_setting = NULL; 4181 signal_setting_t end_signal_setting = NULL; 4182 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4183 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4184 if (begin_signal_setting != NULL) { 4185 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4186 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4187 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4188 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4189 libjsig_is_loaded = true; 4190 assert(UseSignalChaining, "should enable signal-chaining"); 4191 } 4192 if (libjsig_is_loaded) { 4193 // Tell libjsig jvm is setting signal handlers 4194 (*begin_signal_setting)(); 4195 } 4196 4197 set_signal_handler(SIGSEGV, true); 4198 set_signal_handler(SIGPIPE, true); 4199 set_signal_handler(SIGBUS, true); 4200 set_signal_handler(SIGILL, true); 4201 set_signal_handler(SIGFPE, true); 4202 set_signal_handler(SIGXFSZ, true); 4203 4204#if defined(__APPLE__) 4205 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 4206 // signals caught and handled by the JVM. To work around this, we reset the mach task 4207 // signal handler that's placed on our process by CrashReporter. This disables 4208 // CrashReporter-based reporting. 4209 // 4210 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 4211 // on caught fatal signals. 4212 // 4213 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 4214 // handlers. By replacing the existing task exception handler, we disable gdb's mach 4215 // exception handling, while leaving the standard BSD signal handlers functional. 4216 kern_return_t kr; 4217 kr = task_set_exception_ports(mach_task_self(), 4218 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 4219 MACH_PORT_NULL, 4220 EXCEPTION_STATE_IDENTITY, 4221 MACHINE_THREAD_STATE); 4222 4223 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 4224#endif 4225 4226 if (libjsig_is_loaded) { 4227 // Tell libjsig jvm finishes setting signal handlers 4228 (*end_signal_setting)(); 4229 } 4230 4231 // We don't activate signal checker if libjsig is in place, we trust ourselves 4232 // and if UserSignalHandler is installed all bets are off 4233 if (CheckJNICalls) { 4234 if (libjsig_is_loaded) { 4235 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4236 check_signals = false; 4237 } 4238 if (AllowUserSignalHandlers) { 4239 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4240 check_signals = false; 4241 } 4242 } 4243 } 4244} 4245 4246#ifndef _ALLBSD_SOURCE 4247// This is the fastest way to get thread cpu time on Bsd. 4248// Returns cpu time (user+sys) for any thread, not only for current. 4249// POSIX compliant clocks are implemented in the kernels 2.6.16+. 4250// It might work on 2.6.10+ with a special kernel/glibc patch. 4251// For reference, please, see IEEE Std 1003.1-2004: 4252// http://www.unix.org/single_unix_specification 4253 4254jlong os::Bsd::fast_thread_cpu_time(clockid_t clockid) { 4255 struct timespec tp; 4256 int rc = os::Bsd::clock_gettime(clockid, &tp); 4257 assert(rc == 0, "clock_gettime is expected to return 0 code"); 4258 4259 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; 4260} 4261#endif 4262 4263///// 4264// glibc on Bsd platform uses non-documented flag 4265// to indicate, that some special sort of signal 4266// trampoline is used. 4267// We will never set this flag, and we should 4268// ignore this flag in our diagnostic 4269#ifdef SIGNIFICANT_SIGNAL_MASK 4270#undef SIGNIFICANT_SIGNAL_MASK 4271#endif 4272#define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 4273 4274static const char* get_signal_handler_name(address handler, 4275 char* buf, int buflen) { 4276 int offset; 4277 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 4278 if (found) { 4279 // skip directory names 4280 const char *p1, *p2; 4281 p1 = buf; 4282 size_t len = strlen(os::file_separator()); 4283 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 4284 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 4285 } else { 4286 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 4287 } 4288 return buf; 4289} 4290 4291static void print_signal_handler(outputStream* st, int sig, 4292 char* buf, size_t buflen) { 4293 struct sigaction sa; 4294 4295 sigaction(sig, NULL, &sa); 4296 4297 // See comment for SIGNIFICANT_SIGNAL_MASK define 4298 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 4299 4300 st->print("%s: ", os::exception_name(sig, buf, buflen)); 4301 4302 address handler = (sa.sa_flags & SA_SIGINFO) 4303 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 4304 : CAST_FROM_FN_PTR(address, sa.sa_handler); 4305 4306 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 4307 st->print("SIG_DFL"); 4308 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 4309 st->print("SIG_IGN"); 4310 } else { 4311 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 4312 } 4313 4314 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 4315 4316 address rh = VMError::get_resetted_sighandler(sig); 4317 // May be, handler was resetted by VMError? 4318 if(rh != NULL) { 4319 handler = rh; 4320 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 4321 } 4322 4323 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 4324 4325 // Check: is it our handler? 4326 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 4327 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 4328 // It is our signal handler 4329 // check for flags, reset system-used one! 4330 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 4331 st->print( 4332 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 4333 os::Bsd::get_our_sigflags(sig)); 4334 } 4335 } 4336 st->cr(); 4337} 4338 4339 4340#define DO_SIGNAL_CHECK(sig) \ 4341 if (!sigismember(&check_signal_done, sig)) \ 4342 os::Bsd::check_signal_handler(sig) 4343 4344// This method is a periodic task to check for misbehaving JNI applications 4345// under CheckJNI, we can add any periodic checks here 4346 4347void os::run_periodic_checks() { 4348 4349 if (check_signals == false) return; 4350 4351 // SEGV and BUS if overridden could potentially prevent 4352 // generation of hs*.log in the event of a crash, debugging 4353 // such a case can be very challenging, so we absolutely 4354 // check the following for a good measure: 4355 DO_SIGNAL_CHECK(SIGSEGV); 4356 DO_SIGNAL_CHECK(SIGILL); 4357 DO_SIGNAL_CHECK(SIGFPE); 4358 DO_SIGNAL_CHECK(SIGBUS); 4359 DO_SIGNAL_CHECK(SIGPIPE); 4360 DO_SIGNAL_CHECK(SIGXFSZ); 4361 4362 4363 // ReduceSignalUsage allows the user to override these handlers 4364 // see comments at the very top and jvm_solaris.h 4365 if (!ReduceSignalUsage) { 4366 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4367 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4368 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4369 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4370 } 4371 4372 DO_SIGNAL_CHECK(SR_signum); 4373 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 4374} 4375 4376typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4377 4378static os_sigaction_t os_sigaction = NULL; 4379 4380void os::Bsd::check_signal_handler(int sig) { 4381 char buf[O_BUFLEN]; 4382 address jvmHandler = NULL; 4383 4384 4385 struct sigaction act; 4386 if (os_sigaction == NULL) { 4387 // only trust the default sigaction, in case it has been interposed 4388 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4389 if (os_sigaction == NULL) return; 4390 } 4391 4392 os_sigaction(sig, (struct sigaction*)NULL, &act); 4393 4394 4395 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 4396 4397 address thisHandler = (act.sa_flags & SA_SIGINFO) 4398 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4399 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4400 4401 4402 switch(sig) { 4403 case SIGSEGV: 4404 case SIGBUS: 4405 case SIGFPE: 4406 case SIGPIPE: 4407 case SIGILL: 4408 case SIGXFSZ: 4409 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 4410 break; 4411 4412 case SHUTDOWN1_SIGNAL: 4413 case SHUTDOWN2_SIGNAL: 4414 case SHUTDOWN3_SIGNAL: 4415 case BREAK_SIGNAL: 4416 jvmHandler = (address)user_handler(); 4417 break; 4418 4419 case INTERRUPT_SIGNAL: 4420 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 4421 break; 4422 4423 default: 4424 if (sig == SR_signum) { 4425 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 4426 } else { 4427 return; 4428 } 4429 break; 4430 } 4431 4432 if (thisHandler != jvmHandler) { 4433 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4434 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4435 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4436 // No need to check this sig any longer 4437 sigaddset(&check_signal_done, sig); 4438 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 4439 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4440 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 4441 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4442 // No need to check this sig any longer 4443 sigaddset(&check_signal_done, sig); 4444 } 4445 4446 // Dump all the signal 4447 if (sigismember(&check_signal_done, sig)) { 4448 print_signal_handlers(tty, buf, O_BUFLEN); 4449 } 4450} 4451 4452extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 4453 4454extern bool signal_name(int signo, char* buf, size_t len); 4455 4456const char* os::exception_name(int exception_code, char* buf, size_t size) { 4457 if (0 < exception_code && exception_code <= SIGRTMAX) { 4458 // signal 4459 if (!signal_name(exception_code, buf, size)) { 4460 jio_snprintf(buf, size, "SIG%d", exception_code); 4461 } 4462 return buf; 4463 } else { 4464 return NULL; 4465 } 4466} 4467 4468// this is called _before_ the most of global arguments have been parsed 4469void os::init(void) { 4470 char dummy; /* used to get a guess on initial stack address */ 4471// first_hrtime = gethrtime(); 4472 4473 // With BsdThreads the JavaMain thread pid (primordial thread) 4474 // is different than the pid of the java launcher thread. 4475 // So, on Bsd, the launcher thread pid is passed to the VM 4476 // via the sun.java.launcher.pid property. 4477 // Use this property instead of getpid() if it was correctly passed. 4478 // See bug 6351349. 4479 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 4480 4481 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 4482 4483 clock_tics_per_sec = CLK_TCK; 4484 4485 init_random(1234567); 4486 4487 ThreadCritical::initialize(); 4488 4489 Bsd::set_page_size(getpagesize()); 4490 if (Bsd::page_size() == -1) { 4491 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 4492 strerror(errno))); 4493 } 4494 init_page_sizes((size_t) Bsd::page_size()); 4495 4496 Bsd::initialize_system_info(); 4497 4498 // main_thread points to the aboriginal thread 4499 Bsd::_main_thread = pthread_self(); 4500 4501 Bsd::clock_init(); 4502 initial_time_count = os::elapsed_counter(); 4503 4504#ifdef __APPLE__ 4505 // XXXDARWIN 4506 // Work around the unaligned VM callbacks in hotspot's 4507 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 4508 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 4509 // alignment when doing symbol lookup. To work around this, we force early 4510 // binding of all symbols now, thus binding when alignment is known-good. 4511 _dyld_bind_fully_image_containing_address((const void *) &os::init); 4512#endif 4513} 4514 4515// To install functions for atexit system call 4516extern "C" { 4517 static void perfMemory_exit_helper() { 4518 perfMemory_exit(); 4519 } 4520} 4521 4522// this is called _after_ the global arguments have been parsed 4523jint os::init_2(void) 4524{ 4525#ifndef _ALLBSD_SOURCE 4526 Bsd::fast_thread_clock_init(); 4527#endif 4528 4529 // Allocate a single page and mark it as readable for safepoint polling 4530 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 4531 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 4532 4533 os::set_polling_page( polling_page ); 4534 4535#ifndef PRODUCT 4536 if(Verbose && PrintMiscellaneous) 4537 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 4538#endif 4539 4540 if (!UseMembar) { 4541 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 4542 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4543 os::set_memory_serialize_page( mem_serialize_page ); 4544 4545#ifndef PRODUCT 4546 if(Verbose && PrintMiscellaneous) 4547 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 4548#endif 4549 } 4550 4551 os::large_page_init(); 4552 4553 // initialize suspend/resume support - must do this before signal_sets_init() 4554 if (SR_initialize() != 0) { 4555 perror("SR_initialize failed"); 4556 return JNI_ERR; 4557 } 4558 4559 Bsd::signal_sets_init(); 4560 Bsd::install_signal_handlers(); 4561 4562 // Check minimum allowable stack size for thread creation and to initialize 4563 // the java system classes, including StackOverflowError - depends on page 4564 // size. Add a page for compiler2 recursion in main thread. 4565 // Add in 2*BytesPerWord times page size to account for VM stack during 4566 // class initialization depending on 32 or 64 bit VM. 4567 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 4568 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4569 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 4570 4571 size_t threadStackSizeInBytes = ThreadStackSize * K; 4572 if (threadStackSizeInBytes != 0 && 4573 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 4574 tty->print_cr("\nThe stack size specified is too small, " 4575 "Specify at least %dk", 4576 os::Bsd::min_stack_allowed/ K); 4577 return JNI_ERR; 4578 } 4579 4580 // Make the stack size a multiple of the page size so that 4581 // the yellow/red zones can be guarded. 4582 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4583 vm_page_size())); 4584 4585#ifndef _ALLBSD_SOURCE 4586 Bsd::capture_initial_stack(JavaThread::stack_size_at_create()); 4587 4588 Bsd::libpthread_init(); 4589 if (PrintMiscellaneous && (Verbose || WizardMode)) { 4590 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", 4591 Bsd::glibc_version(), Bsd::libpthread_version(), 4592 Bsd::is_floating_stack() ? "floating stack" : "fixed stack"); 4593 } 4594 4595 if (UseNUMA) { 4596 if (!Bsd::libnuma_init()) { 4597 UseNUMA = false; 4598 } else { 4599 if ((Bsd::numa_max_node() < 1)) { 4600 // There's only one node(they start from 0), disable NUMA. 4601 UseNUMA = false; 4602 } 4603 } 4604 // With SHM large pages we cannot uncommit a page, so there's not way 4605 // we can make the adaptive lgrp chunk resizing work. If the user specified 4606 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and 4607 // disable adaptive resizing. 4608 if (UseNUMA && UseLargePages && UseSHM) { 4609 if (!FLAG_IS_DEFAULT(UseNUMA)) { 4610 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) { 4611 UseLargePages = false; 4612 } else { 4613 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing"); 4614 UseAdaptiveSizePolicy = false; 4615 UseAdaptiveNUMAChunkSizing = false; 4616 } 4617 } else { 4618 UseNUMA = false; 4619 } 4620 } 4621 if (!UseNUMA && ForceNUMA) { 4622 UseNUMA = true; 4623 } 4624 } 4625#endif 4626 4627 if (MaxFDLimit) { 4628 // set the number of file descriptors to max. print out error 4629 // if getrlimit/setrlimit fails but continue regardless. 4630 struct rlimit nbr_files; 4631 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4632 if (status != 0) { 4633 if (PrintMiscellaneous && (Verbose || WizardMode)) 4634 perror("os::init_2 getrlimit failed"); 4635 } else { 4636 nbr_files.rlim_cur = nbr_files.rlim_max; 4637 4638#ifdef __APPLE__ 4639 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 4640 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 4641 // be used instead 4642 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 4643#endif 4644 4645 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4646 if (status != 0) { 4647 if (PrintMiscellaneous && (Verbose || WizardMode)) 4648 perror("os::init_2 setrlimit failed"); 4649 } 4650 } 4651 } 4652 4653#ifndef _ALLBSD_SOURCE 4654 // Initialize lock used to serialize thread creation (see os::create_thread) 4655 Bsd::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); 4656#endif 4657 4658 // at-exit methods are called in the reverse order of their registration. 4659 // atexit functions are called on return from main or as a result of a 4660 // call to exit(3C). There can be only 32 of these functions registered 4661 // and atexit() does not set errno. 4662 4663 if (PerfAllowAtExitRegistration) { 4664 // only register atexit functions if PerfAllowAtExitRegistration is set. 4665 // atexit functions can be delayed until process exit time, which 4666 // can be problematic for embedded VM situations. Embedded VMs should 4667 // call DestroyJavaVM() to assure that VM resources are released. 4668 4669 // note: perfMemory_exit_helper atexit function may be removed in 4670 // the future if the appropriate cleanup code can be added to the 4671 // VM_Exit VMOperation's doit method. 4672 if (atexit(perfMemory_exit_helper) != 0) { 4673 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4674 } 4675 } 4676 4677 // initialize thread priority policy 4678 prio_init(); 4679 4680#ifdef __APPLE__ 4681 // dynamically link to objective c gc registration 4682 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 4683 if (handleLibObjc != NULL) { 4684 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 4685 } 4686#endif 4687 4688 return JNI_OK; 4689} 4690 4691// this is called at the end of vm_initialization 4692void os::init_3(void) { } 4693 4694// Mark the polling page as unreadable 4695void os::make_polling_page_unreadable(void) { 4696 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 4697 fatal("Could not disable polling page"); 4698}; 4699 4700// Mark the polling page as readable 4701void os::make_polling_page_readable(void) { 4702 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 4703 fatal("Could not enable polling page"); 4704 } 4705}; 4706 4707int os::active_processor_count() { 4708#ifdef _ALLBSD_SOURCE 4709 return _processor_count; 4710#else 4711 // Bsd doesn't yet have a (official) notion of processor sets, 4712 // so just return the number of online processors. 4713 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 4714 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 4715 return online_cpus; 4716#endif 4717} 4718 4719void os::set_native_thread_name(const char *name) { 4720#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 4721 // This is only supported in Snow Leopard and beyond 4722 if (name != NULL) { 4723 // Add a "Java: " prefix to the name 4724 char buf[MAXTHREADNAMESIZE]; 4725 snprintf(buf, sizeof(buf), "Java: %s", name); 4726 pthread_setname_np(buf); 4727 } 4728#endif 4729} 4730 4731bool os::distribute_processes(uint length, uint* distribution) { 4732 // Not yet implemented. 4733 return false; 4734} 4735 4736bool os::bind_to_processor(uint processor_id) { 4737 // Not yet implemented. 4738 return false; 4739} 4740 4741/// 4742 4743// Suspends the target using the signal mechanism and then grabs the PC before 4744// resuming the target. Used by the flat-profiler only 4745ExtendedPC os::get_thread_pc(Thread* thread) { 4746 // Make sure that it is called by the watcher for the VMThread 4747 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 4748 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4749 4750 ExtendedPC epc; 4751 4752 OSThread* osthread = thread->osthread(); 4753 if (do_suspend(osthread)) { 4754 if (osthread->ucontext() != NULL) { 4755 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); 4756 } else { 4757 // NULL context is unexpected, double-check this is the VMThread 4758 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 4759 } 4760 do_resume(osthread); 4761 } 4762 // failure means pthread_kill failed for some reason - arguably this is 4763 // a fatal problem, but such problems are ignored elsewhere 4764 4765 return epc; 4766} 4767 4768int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 4769{ 4770#ifdef _ALLBSD_SOURCE 4771 return pthread_cond_timedwait(_cond, _mutex, _abstime); 4772#else 4773 if (is_NPTL()) { 4774 return pthread_cond_timedwait(_cond, _mutex, _abstime); 4775 } else { 4776#ifndef IA64 4777 // 6292965: BsdThreads pthread_cond_timedwait() resets FPU control 4778 // word back to default 64bit precision if condvar is signaled. Java 4779 // wants 53bit precision. Save and restore current value. 4780 int fpu = get_fpu_control_word(); 4781#endif // IA64 4782 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); 4783#ifndef IA64 4784 set_fpu_control_word(fpu); 4785#endif // IA64 4786 return status; 4787 } 4788#endif 4789} 4790 4791//////////////////////////////////////////////////////////////////////////////// 4792// debug support 4793 4794static address same_page(address x, address y) { 4795 int page_bits = -os::vm_page_size(); 4796 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 4797 return x; 4798 else if (x > y) 4799 return (address)(intptr_t(y) | ~page_bits) + 1; 4800 else 4801 return (address)(intptr_t(y) & page_bits); 4802} 4803 4804bool os::find(address addr, outputStream* st) { 4805 Dl_info dlinfo; 4806 memset(&dlinfo, 0, sizeof(dlinfo)); 4807 if (dladdr(addr, &dlinfo)) { 4808 st->print(PTR_FORMAT ": ", addr); 4809 if (dlinfo.dli_sname != NULL) { 4810 st->print("%s+%#x", dlinfo.dli_sname, 4811 addr - (intptr_t)dlinfo.dli_saddr); 4812 } else if (dlinfo.dli_fname) { 4813 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 4814 } else { 4815 st->print("<absolute address>"); 4816 } 4817 if (dlinfo.dli_fname) { 4818 st->print(" in %s", dlinfo.dli_fname); 4819 } 4820 if (dlinfo.dli_fbase) { 4821 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4822 } 4823 st->cr(); 4824 4825 if (Verbose) { 4826 // decode some bytes around the PC 4827 address begin = same_page(addr-40, addr); 4828 address end = same_page(addr+40, addr); 4829 address lowest = (address) dlinfo.dli_sname; 4830 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4831 if (begin < lowest) begin = lowest; 4832 Dl_info dlinfo2; 4833 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 4834 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 4835 end = (address) dlinfo2.dli_saddr; 4836 Disassembler::decode(begin, end, st); 4837 } 4838 return true; 4839 } 4840 return false; 4841} 4842 4843//////////////////////////////////////////////////////////////////////////////// 4844// misc 4845 4846// This does not do anything on Bsd. This is basically a hook for being 4847// able to use structured exception handling (thread-local exception filters) 4848// on, e.g., Win32. 4849void 4850os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 4851 JavaCallArguments* args, Thread* thread) { 4852 f(value, method, args, thread); 4853} 4854 4855void os::print_statistics() { 4856} 4857 4858int os::message_box(const char* title, const char* message) { 4859 int i; 4860 fdStream err(defaultStream::error_fd()); 4861 for (i = 0; i < 78; i++) err.print_raw("="); 4862 err.cr(); 4863 err.print_raw_cr(title); 4864 for (i = 0; i < 78; i++) err.print_raw("-"); 4865 err.cr(); 4866 err.print_raw_cr(message); 4867 for (i = 0; i < 78; i++) err.print_raw("="); 4868 err.cr(); 4869 4870 char buf[16]; 4871 // Prevent process from exiting upon "read error" without consuming all CPU 4872 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4873 4874 return buf[0] == 'y' || buf[0] == 'Y'; 4875} 4876 4877int os::stat(const char *path, struct stat *sbuf) { 4878 char pathbuf[MAX_PATH]; 4879 if (strlen(path) > MAX_PATH - 1) { 4880 errno = ENAMETOOLONG; 4881 return -1; 4882 } 4883 os::native_path(strcpy(pathbuf, path)); 4884 return ::stat(pathbuf, sbuf); 4885} 4886 4887bool os::check_heap(bool force) { 4888 return true; 4889} 4890 4891int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 4892 return ::vsnprintf(buf, count, format, args); 4893} 4894 4895// Is a (classpath) directory empty? 4896bool os::dir_is_empty(const char* path) { 4897 DIR *dir = NULL; 4898 struct dirent *ptr; 4899 4900 dir = opendir(path); 4901 if (dir == NULL) return true; 4902 4903 /* Scan the directory */ 4904 bool result = true; 4905 char buf[sizeof(struct dirent) + MAX_PATH]; 4906 while (result && (ptr = ::readdir(dir)) != NULL) { 4907 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4908 result = false; 4909 } 4910 } 4911 closedir(dir); 4912 return result; 4913} 4914 4915// This code originates from JDK's sysOpen and open64_w 4916// from src/solaris/hpi/src/system_md.c 4917 4918#ifndef O_DELETE 4919#define O_DELETE 0x10000 4920#endif 4921 4922// Open a file. Unlink the file immediately after open returns 4923// if the specified oflag has the O_DELETE flag set. 4924// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 4925 4926int os::open(const char *path, int oflag, int mode) { 4927 4928 if (strlen(path) > MAX_PATH - 1) { 4929 errno = ENAMETOOLONG; 4930 return -1; 4931 } 4932 int fd; 4933 int o_delete = (oflag & O_DELETE); 4934 oflag = oflag & ~O_DELETE; 4935 4936 fd = ::open(path, oflag, mode); 4937 if (fd == -1) return -1; 4938 4939 //If the open succeeded, the file might still be a directory 4940 { 4941 struct stat buf; 4942 int ret = ::fstat(fd, &buf); 4943 int st_mode = buf.st_mode; 4944 4945 if (ret != -1) { 4946 if ((st_mode & S_IFMT) == S_IFDIR) { 4947 errno = EISDIR; 4948 ::close(fd); 4949 return -1; 4950 } 4951 } else { 4952 ::close(fd); 4953 return -1; 4954 } 4955 } 4956 4957 /* 4958 * All file descriptors that are opened in the JVM and not 4959 * specifically destined for a subprocess should have the 4960 * close-on-exec flag set. If we don't set it, then careless 3rd 4961 * party native code might fork and exec without closing all 4962 * appropriate file descriptors (e.g. as we do in closeDescriptors in 4963 * UNIXProcess.c), and this in turn might: 4964 * 4965 * - cause end-of-file to fail to be detected on some file 4966 * descriptors, resulting in mysterious hangs, or 4967 * 4968 * - might cause an fopen in the subprocess to fail on a system 4969 * suffering from bug 1085341. 4970 * 4971 * (Yes, the default setting of the close-on-exec flag is a Unix 4972 * design flaw) 4973 * 4974 * See: 4975 * 1085341: 32-bit stdio routines should support file descriptors >255 4976 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4977 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4978 */ 4979#ifdef FD_CLOEXEC 4980 { 4981 int flags = ::fcntl(fd, F_GETFD); 4982 if (flags != -1) 4983 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4984 } 4985#endif 4986 4987 if (o_delete != 0) { 4988 ::unlink(path); 4989 } 4990 return fd; 4991} 4992 4993 4994// create binary file, rewriting existing file if required 4995int os::create_binary_file(const char* path, bool rewrite_existing) { 4996 int oflags = O_WRONLY | O_CREAT; 4997 if (!rewrite_existing) { 4998 oflags |= O_EXCL; 4999 } 5000 return ::open(path, oflags, S_IREAD | S_IWRITE); 5001} 5002 5003// return current position of file pointer 5004jlong os::current_file_offset(int fd) { 5005 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 5006} 5007 5008// move file pointer to the specified offset 5009jlong os::seek_to_file_offset(int fd, jlong offset) { 5010 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 5011} 5012 5013// This code originates from JDK's sysAvailable 5014// from src/solaris/hpi/src/native_threads/src/sys_api_td.c 5015 5016int os::available(int fd, jlong *bytes) { 5017 jlong cur, end; 5018 int mode; 5019 struct stat buf; 5020 5021 if (::fstat(fd, &buf) >= 0) { 5022 mode = buf.st_mode; 5023 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 5024 /* 5025 * XXX: is the following call interruptible? If so, this might 5026 * need to go through the INTERRUPT_IO() wrapper as for other 5027 * blocking, interruptible calls in this file. 5028 */ 5029 int n; 5030 if (::ioctl(fd, FIONREAD, &n) >= 0) { 5031 *bytes = n; 5032 return 1; 5033 } 5034 } 5035 } 5036 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 5037 return 0; 5038 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 5039 return 0; 5040 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 5041 return 0; 5042 } 5043 *bytes = end - cur; 5044 return 1; 5045} 5046 5047int os::socket_available(int fd, jint *pbytes) { 5048 if (fd < 0) 5049 return OS_OK; 5050 5051 int ret; 5052 5053 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 5054 5055 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 5056 // is expected to return 0 on failure and 1 on success to the jdk. 5057 5058 return (ret == OS_ERR) ? 0 : 1; 5059} 5060 5061// Map a block of memory. 5062char* os::map_memory(int fd, const char* file_name, size_t file_offset, 5063 char *addr, size_t bytes, bool read_only, 5064 bool allow_exec) { 5065 int prot; 5066 int flags; 5067 5068 if (read_only) { 5069 prot = PROT_READ; 5070 flags = MAP_SHARED; 5071 } else { 5072 prot = PROT_READ | PROT_WRITE; 5073 flags = MAP_PRIVATE; 5074 } 5075 5076 if (allow_exec) { 5077 prot |= PROT_EXEC; 5078 } 5079 5080 if (addr != NULL) { 5081 flags |= MAP_FIXED; 5082 } 5083 5084 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5085 fd, file_offset); 5086 if (mapped_address == MAP_FAILED) { 5087 return NULL; 5088 } 5089 return mapped_address; 5090} 5091 5092 5093// Remap a block of memory. 5094char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 5095 char *addr, size_t bytes, bool read_only, 5096 bool allow_exec) { 5097 // same as map_memory() on this OS 5098 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5099 allow_exec); 5100} 5101 5102 5103// Unmap a block of memory. 5104bool os::unmap_memory(char* addr, size_t bytes) { 5105 return munmap(addr, bytes) == 0; 5106} 5107 5108#ifndef _ALLBSD_SOURCE 5109static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); 5110 5111static clockid_t thread_cpu_clockid(Thread* thread) { 5112 pthread_t tid = thread->osthread()->pthread_id(); 5113 clockid_t clockid; 5114 5115 // Get thread clockid 5116 int rc = os::Bsd::pthread_getcpuclockid(tid, &clockid); 5117 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); 5118 return clockid; 5119} 5120#endif 5121 5122// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5123// are used by JVM M&M and JVMTI to get user+sys or user CPU time 5124// of a thread. 5125// 5126// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 5127// the fast estimate available on the platform. 5128 5129jlong os::current_thread_cpu_time() { 5130#ifdef __APPLE__ 5131 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 5132#elif !defined(_ALLBSD_SOURCE) 5133 if (os::Bsd::supports_fast_thread_cpu_time()) { 5134 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); 5135 } else { 5136 // return user + sys since the cost is the same 5137 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); 5138 } 5139#endif 5140} 5141 5142jlong os::thread_cpu_time(Thread* thread) { 5143#ifndef _ALLBSD_SOURCE 5144 // consistent with what current_thread_cpu_time() returns 5145 if (os::Bsd::supports_fast_thread_cpu_time()) { 5146 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); 5147 } else { 5148 return slow_thread_cpu_time(thread, true /* user + sys */); 5149 } 5150#endif 5151} 5152 5153jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5154#ifdef __APPLE__ 5155 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5156#elif !defined(_ALLBSD_SOURCE) 5157 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { 5158 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); 5159 } else { 5160 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); 5161 } 5162#endif 5163} 5164 5165jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5166#ifdef __APPLE__ 5167 struct thread_basic_info tinfo; 5168 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 5169 kern_return_t kr; 5170 thread_t mach_thread; 5171 5172 mach_thread = thread->osthread()->thread_id(); 5173 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 5174 if (kr != KERN_SUCCESS) 5175 return -1; 5176 5177 if (user_sys_cpu_time) { 5178 jlong nanos; 5179 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 5180 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 5181 return nanos; 5182 } else { 5183 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 5184 } 5185#elif !defined(_ALLBSD_SOURCE) 5186 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { 5187 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); 5188 } else { 5189 return slow_thread_cpu_time(thread, user_sys_cpu_time); 5190 } 5191#endif 5192} 5193 5194#ifndef _ALLBSD_SOURCE 5195// 5196// -1 on error. 5197// 5198 5199static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5200 static bool proc_pid_cpu_avail = true; 5201 static bool proc_task_unchecked = true; 5202 static const char *proc_stat_path = "/proc/%d/stat"; 5203 pid_t tid = thread->osthread()->thread_id(); 5204 int i; 5205 char *s; 5206 char stat[2048]; 5207 int statlen; 5208 char proc_name[64]; 5209 int count; 5210 long sys_time, user_time; 5211 char string[64]; 5212 char cdummy; 5213 int idummy; 5214 long ldummy; 5215 FILE *fp; 5216 5217 // We first try accessing /proc/<pid>/cpu since this is faster to 5218 // process. If this file is not present (bsd kernels 2.5 and above) 5219 // then we open /proc/<pid>/stat. 5220 if ( proc_pid_cpu_avail ) { 5221 sprintf(proc_name, "/proc/%d/cpu", tid); 5222 fp = fopen(proc_name, "r"); 5223 if ( fp != NULL ) { 5224 count = fscanf( fp, "%s %lu %lu\n", string, &user_time, &sys_time); 5225 fclose(fp); 5226 if ( count != 3 ) return -1; 5227 5228 if (user_sys_cpu_time) { 5229 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); 5230 } else { 5231 return (jlong)user_time * (1000000000 / clock_tics_per_sec); 5232 } 5233 } 5234 else proc_pid_cpu_avail = false; 5235 } 5236 5237 // The /proc/<tid>/stat aggregates per-process usage on 5238 // new Bsd kernels 2.6+ where NPTL is supported. 5239 // The /proc/self/task/<tid>/stat still has the per-thread usage. 5240 // See bug 6328462. 5241 // There can be no directory /proc/self/task on kernels 2.4 with NPTL 5242 // and possibly in some other cases, so we check its availability. 5243 if (proc_task_unchecked && os::Bsd::is_NPTL()) { 5244 // This is executed only once 5245 proc_task_unchecked = false; 5246 fp = fopen("/proc/self/task", "r"); 5247 if (fp != NULL) { 5248 proc_stat_path = "/proc/self/task/%d/stat"; 5249 fclose(fp); 5250 } 5251 } 5252 5253 sprintf(proc_name, proc_stat_path, tid); 5254 fp = fopen(proc_name, "r"); 5255 if ( fp == NULL ) return -1; 5256 statlen = fread(stat, 1, 2047, fp); 5257 stat[statlen] = '\0'; 5258 fclose(fp); 5259 5260 // Skip pid and the command string. Note that we could be dealing with 5261 // weird command names, e.g. user could decide to rename java launcher 5262 // to "java 1.4.2 :)", then the stat file would look like 5263 // 1234 (java 1.4.2 :)) R ... ... 5264 // We don't really need to know the command string, just find the last 5265 // occurrence of ")" and then start parsing from there. See bug 4726580. 5266 s = strrchr(stat, ')'); 5267 i = 0; 5268 if (s == NULL ) return -1; 5269 5270 // Skip blank chars 5271 do s++; while (isspace(*s)); 5272 5273 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", 5274 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, 5275 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, 5276 &user_time, &sys_time); 5277 if ( count != 13 ) return -1; 5278 if (user_sys_cpu_time) { 5279 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); 5280 } else { 5281 return (jlong)user_time * (1000000000 / clock_tics_per_sec); 5282 } 5283} 5284#endif 5285 5286void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5287 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5288 info_ptr->may_skip_backward = false; // elapsed time not wall time 5289 info_ptr->may_skip_forward = false; // elapsed time not wall time 5290 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 5291} 5292 5293void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5294 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5295 info_ptr->may_skip_backward = false; // elapsed time not wall time 5296 info_ptr->may_skip_forward = false; // elapsed time not wall time 5297 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 5298} 5299 5300bool os::is_thread_cpu_time_supported() { 5301#ifdef __APPLE__ 5302 return true; 5303#elif defined(_ALLBSD_SOURCE) 5304 return false; 5305#else 5306 return true; 5307#endif 5308} 5309 5310// System loadavg support. Returns -1 if load average cannot be obtained. 5311// Bsd doesn't yet have a (official) notion of processor sets, 5312// so just return the system wide load average. 5313int os::loadavg(double loadavg[], int nelem) { 5314 return ::getloadavg(loadavg, nelem); 5315} 5316 5317void os::pause() { 5318 char filename[MAX_PATH]; 5319 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5320 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5321 } else { 5322 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5323 } 5324 5325 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5326 if (fd != -1) { 5327 struct stat buf; 5328 ::close(fd); 5329 while (::stat(filename, &buf) == 0) { 5330 (void)::poll(NULL, 0, 100); 5331 } 5332 } else { 5333 jio_fprintf(stderr, 5334 "Could not open pause file '%s', continuing immediately.\n", filename); 5335 } 5336} 5337 5338 5339// Refer to the comments in os_solaris.cpp park-unpark. 5340// 5341// Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 5342// hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 5343// For specifics regarding the bug see GLIBC BUGID 261237 : 5344// http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 5345// Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 5346// will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 5347// is used. (The simple C test-case provided in the GLIBC bug report manifests the 5348// hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 5349// and monitorenter when we're using 1-0 locking. All those operations may result in 5350// calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 5351// of libpthread avoids the problem, but isn't practical. 5352// 5353// Possible remedies: 5354// 5355// 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 5356// This is palliative and probabilistic, however. If the thread is preempted 5357// between the call to compute_abstime() and pthread_cond_timedwait(), more 5358// than the minimum period may have passed, and the abstime may be stale (in the 5359// past) resultin in a hang. Using this technique reduces the odds of a hang 5360// but the JVM is still vulnerable, particularly on heavily loaded systems. 5361// 5362// 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 5363// of the usual flag-condvar-mutex idiom. The write side of the pipe is set 5364// NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 5365// reduces to poll()+read(). This works well, but consumes 2 FDs per extant 5366// thread. 5367// 5368// 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 5369// that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 5370// a timeout request to the chron thread and then blocking via pthread_cond_wait(). 5371// This also works well. In fact it avoids kernel-level scalability impediments 5372// on certain platforms that don't handle lots of active pthread_cond_timedwait() 5373// timers in a graceful fashion. 5374// 5375// 4. When the abstime value is in the past it appears that control returns 5376// correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 5377// Subsequent timedwait/wait calls may hang indefinitely. Given that, we 5378// can avoid the problem by reinitializing the condvar -- by cond_destroy() 5379// followed by cond_init() -- after all calls to pthread_cond_timedwait(). 5380// It may be possible to avoid reinitialization by checking the return 5381// value from pthread_cond_timedwait(). In addition to reinitializing the 5382// condvar we must establish the invariant that cond_signal() is only called 5383// within critical sections protected by the adjunct mutex. This prevents 5384// cond_signal() from "seeing" a condvar that's in the midst of being 5385// reinitialized or that is corrupt. Sadly, this invariant obviates the 5386// desirable signal-after-unlock optimization that avoids futile context switching. 5387// 5388// I'm also concerned that some versions of NTPL might allocate an auxilliary 5389// structure when a condvar is used or initialized. cond_destroy() would 5390// release the helper structure. Our reinitialize-after-timedwait fix 5391// put excessive stress on malloc/free and locks protecting the c-heap. 5392// 5393// We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 5394// It may be possible to refine (4) by checking the kernel and NTPL verisons 5395// and only enabling the work-around for vulnerable environments. 5396 5397// utility to compute the abstime argument to timedwait: 5398// millis is the relative timeout time 5399// abstime will be the absolute timeout time 5400// TODO: replace compute_abstime() with unpackTime() 5401 5402static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 5403 if (millis < 0) millis = 0; 5404 struct timeval now; 5405 int status = gettimeofday(&now, NULL); 5406 assert(status == 0, "gettimeofday"); 5407 jlong seconds = millis / 1000; 5408 millis %= 1000; 5409 if (seconds > 50000000) { // see man cond_timedwait(3T) 5410 seconds = 50000000; 5411 } 5412 abstime->tv_sec = now.tv_sec + seconds; 5413 long usec = now.tv_usec + millis * 1000; 5414 if (usec >= 1000000) { 5415 abstime->tv_sec += 1; 5416 usec -= 1000000; 5417 } 5418 abstime->tv_nsec = usec * 1000; 5419 return abstime; 5420} 5421 5422 5423// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5424// Conceptually TryPark() should be equivalent to park(0). 5425 5426int os::PlatformEvent::TryPark() { 5427 for (;;) { 5428 const int v = _Event ; 5429 guarantee ((v == 0) || (v == 1), "invariant") ; 5430 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5431 } 5432} 5433 5434void os::PlatformEvent::park() { // AKA "down()" 5435 // Invariant: Only the thread associated with the Event/PlatformEvent 5436 // may call park(). 5437 // TODO: assert that _Assoc != NULL or _Assoc == Self 5438 int v ; 5439 for (;;) { 5440 v = _Event ; 5441 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5442 } 5443 guarantee (v >= 0, "invariant") ; 5444 if (v == 0) { 5445 // Do this the hard way by blocking ... 5446 int status = pthread_mutex_lock(_mutex); 5447 assert_status(status == 0, status, "mutex_lock"); 5448 guarantee (_nParked == 0, "invariant") ; 5449 ++ _nParked ; 5450 while (_Event < 0) { 5451 status = pthread_cond_wait(_cond, _mutex); 5452 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5453 // Treat this the same as if the wait was interrupted 5454 if (status == ETIMEDOUT) { status = EINTR; } 5455 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5456 } 5457 -- _nParked ; 5458 5459 // In theory we could move the ST of 0 into _Event past the unlock(), 5460 // but then we'd need a MEMBAR after the ST. 5461 _Event = 0 ; 5462 status = pthread_mutex_unlock(_mutex); 5463 assert_status(status == 0, status, "mutex_unlock"); 5464 } 5465 guarantee (_Event >= 0, "invariant") ; 5466} 5467 5468int os::PlatformEvent::park(jlong millis) { 5469 guarantee (_nParked == 0, "invariant") ; 5470 5471 int v ; 5472 for (;;) { 5473 v = _Event ; 5474 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5475 } 5476 guarantee (v >= 0, "invariant") ; 5477 if (v != 0) return OS_OK ; 5478 5479 // We do this the hard way, by blocking the thread. 5480 // Consider enforcing a minimum timeout value. 5481 struct timespec abst; 5482 compute_abstime(&abst, millis); 5483 5484 int ret = OS_TIMEOUT; 5485 int status = pthread_mutex_lock(_mutex); 5486 assert_status(status == 0, status, "mutex_lock"); 5487 guarantee (_nParked == 0, "invariant") ; 5488 ++_nParked ; 5489 5490 // Object.wait(timo) will return because of 5491 // (a) notification 5492 // (b) timeout 5493 // (c) thread.interrupt 5494 // 5495 // Thread.interrupt and object.notify{All} both call Event::set. 5496 // That is, we treat thread.interrupt as a special case of notification. 5497 // The underlying Solaris implementation, cond_timedwait, admits 5498 // spurious/premature wakeups, but the JLS/JVM spec prevents the 5499 // JVM from making those visible to Java code. As such, we must 5500 // filter out spurious wakeups. We assume all ETIME returns are valid. 5501 // 5502 // TODO: properly differentiate simultaneous notify+interrupt. 5503 // In that case, we should propagate the notify to another waiter. 5504 5505 while (_Event < 0) { 5506 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 5507 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 5508 pthread_cond_destroy (_cond); 5509 pthread_cond_init (_cond, NULL) ; 5510 } 5511 assert_status(status == 0 || status == EINTR || 5512 status == ETIMEDOUT, 5513 status, "cond_timedwait"); 5514 if (!FilterSpuriousWakeups) break ; // previous semantics 5515 if (status == ETIMEDOUT) break ; 5516 // We consume and ignore EINTR and spurious wakeups. 5517 } 5518 --_nParked ; 5519 if (_Event >= 0) { 5520 ret = OS_OK; 5521 } 5522 _Event = 0 ; 5523 status = pthread_mutex_unlock(_mutex); 5524 assert_status(status == 0, status, "mutex_unlock"); 5525 assert (_nParked == 0, "invariant") ; 5526 return ret; 5527} 5528 5529void os::PlatformEvent::unpark() { 5530 int v, AnyWaiters ; 5531 for (;;) { 5532 v = _Event ; 5533 if (v > 0) { 5534 // The LD of _Event could have reordered or be satisfied 5535 // by a read-aside from this processor's write buffer. 5536 // To avoid problems execute a barrier and then 5537 // ratify the value. 5538 OrderAccess::fence() ; 5539 if (_Event == v) return ; 5540 continue ; 5541 } 5542 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 5543 } 5544 if (v < 0) { 5545 // Wait for the thread associated with the event to vacate 5546 int status = pthread_mutex_lock(_mutex); 5547 assert_status(status == 0, status, "mutex_lock"); 5548 AnyWaiters = _nParked ; 5549 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 5550 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 5551 AnyWaiters = 0 ; 5552 pthread_cond_signal (_cond); 5553 } 5554 status = pthread_mutex_unlock(_mutex); 5555 assert_status(status == 0, status, "mutex_unlock"); 5556 if (AnyWaiters != 0) { 5557 status = pthread_cond_signal(_cond); 5558 assert_status(status == 0, status, "cond_signal"); 5559 } 5560 } 5561 5562 // Note that we signal() _after dropping the lock for "immortal" Events. 5563 // This is safe and avoids a common class of futile wakeups. In rare 5564 // circumstances this can cause a thread to return prematurely from 5565 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 5566 // simply re-test the condition and re-park itself. 5567} 5568 5569 5570// JSR166 5571// ------------------------------------------------------- 5572 5573/* 5574 * The solaris and bsd implementations of park/unpark are fairly 5575 * conservative for now, but can be improved. They currently use a 5576 * mutex/condvar pair, plus a a count. 5577 * Park decrements count if > 0, else does a condvar wait. Unpark 5578 * sets count to 1 and signals condvar. Only one thread ever waits 5579 * on the condvar. Contention seen when trying to park implies that someone 5580 * is unparking you, so don't wait. And spurious returns are fine, so there 5581 * is no need to track notifications. 5582 */ 5583 5584#define MAX_SECS 100000000 5585/* 5586 * This code is common to bsd and solaris and will be moved to a 5587 * common place in dolphin. 5588 * 5589 * The passed in time value is either a relative time in nanoseconds 5590 * or an absolute time in milliseconds. Either way it has to be unpacked 5591 * into suitable seconds and nanoseconds components and stored in the 5592 * given timespec structure. 5593 * Given time is a 64-bit value and the time_t used in the timespec is only 5594 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 5595 * overflow if times way in the future are given. Further on Solaris versions 5596 * prior to 10 there is a restriction (see cond_timedwait) that the specified 5597 * number of seconds, in abstime, is less than current_time + 100,000,000. 5598 * As it will be 28 years before "now + 100000000" will overflow we can 5599 * ignore overflow and just impose a hard-limit on seconds using the value 5600 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 5601 * years from "now". 5602 */ 5603 5604static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 5605 assert (time > 0, "convertTime"); 5606 5607 struct timeval now; 5608 int status = gettimeofday(&now, NULL); 5609 assert(status == 0, "gettimeofday"); 5610 5611 time_t max_secs = now.tv_sec + MAX_SECS; 5612 5613 if (isAbsolute) { 5614 jlong secs = time / 1000; 5615 if (secs > max_secs) { 5616 absTime->tv_sec = max_secs; 5617 } 5618 else { 5619 absTime->tv_sec = secs; 5620 } 5621 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5622 } 5623 else { 5624 jlong secs = time / NANOSECS_PER_SEC; 5625 if (secs >= MAX_SECS) { 5626 absTime->tv_sec = max_secs; 5627 absTime->tv_nsec = 0; 5628 } 5629 else { 5630 absTime->tv_sec = now.tv_sec + secs; 5631 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5632 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5633 absTime->tv_nsec -= NANOSECS_PER_SEC; 5634 ++absTime->tv_sec; // note: this must be <= max_secs 5635 } 5636 } 5637 } 5638 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5639 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5640 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5641 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5642} 5643 5644void Parker::park(bool isAbsolute, jlong time) { 5645 // Optional fast-path check: 5646 // Return immediately if a permit is available. 5647 if (_counter > 0) { 5648 _counter = 0 ; 5649 OrderAccess::fence(); 5650 return ; 5651 } 5652 5653 Thread* thread = Thread::current(); 5654 assert(thread->is_Java_thread(), "Must be JavaThread"); 5655 JavaThread *jt = (JavaThread *)thread; 5656 5657 // Optional optimization -- avoid state transitions if there's an interrupt pending. 5658 // Check interrupt before trying to wait 5659 if (Thread::is_interrupted(thread, false)) { 5660 return; 5661 } 5662 5663 // Next, demultiplex/decode time arguments 5664 struct timespec absTime; 5665 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 5666 return; 5667 } 5668 if (time > 0) { 5669 unpackTime(&absTime, isAbsolute, time); 5670 } 5671 5672 5673 // Enter safepoint region 5674 // Beware of deadlocks such as 6317397. 5675 // The per-thread Parker:: mutex is a classic leaf-lock. 5676 // In particular a thread must never block on the Threads_lock while 5677 // holding the Parker:: mutex. If safepoints are pending both the 5678 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5679 ThreadBlockInVM tbivm(jt); 5680 5681 // Don't wait if cannot get lock since interference arises from 5682 // unblocking. Also. check interrupt before trying wait 5683 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 5684 return; 5685 } 5686 5687 int status ; 5688 if (_counter > 0) { // no wait needed 5689 _counter = 0; 5690 status = pthread_mutex_unlock(_mutex); 5691 assert (status == 0, "invariant") ; 5692 OrderAccess::fence(); 5693 return; 5694 } 5695 5696#ifdef ASSERT 5697 // Don't catch signals while blocked; let the running threads have the signals. 5698 // (This allows a debugger to break into the running thread.) 5699 sigset_t oldsigs; 5700 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 5701 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5702#endif 5703 5704 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5705 jt->set_suspend_equivalent(); 5706 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5707 5708 if (time == 0) { 5709 status = pthread_cond_wait (_cond, _mutex) ; 5710 } else { 5711 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 5712 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 5713 pthread_cond_destroy (_cond) ; 5714 pthread_cond_init (_cond, NULL); 5715 } 5716 } 5717 assert_status(status == 0 || status == EINTR || 5718 status == ETIMEDOUT, 5719 status, "cond_timedwait"); 5720 5721#ifdef ASSERT 5722 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5723#endif 5724 5725 _counter = 0 ; 5726 status = pthread_mutex_unlock(_mutex) ; 5727 assert_status(status == 0, status, "invariant") ; 5728 // If externally suspended while waiting, re-suspend 5729 if (jt->handle_special_suspend_equivalent_condition()) { 5730 jt->java_suspend_self(); 5731 } 5732 5733 OrderAccess::fence(); 5734} 5735 5736void Parker::unpark() { 5737 int s, status ; 5738 status = pthread_mutex_lock(_mutex); 5739 assert (status == 0, "invariant") ; 5740 s = _counter; 5741 _counter = 1; 5742 if (s < 1) { 5743 if (WorkAroundNPTLTimedWaitHang) { 5744 status = pthread_cond_signal (_cond) ; 5745 assert (status == 0, "invariant") ; 5746 status = pthread_mutex_unlock(_mutex); 5747 assert (status == 0, "invariant") ; 5748 } else { 5749 status = pthread_mutex_unlock(_mutex); 5750 assert (status == 0, "invariant") ; 5751 status = pthread_cond_signal (_cond) ; 5752 assert (status == 0, "invariant") ; 5753 } 5754 } else { 5755 pthread_mutex_unlock(_mutex); 5756 assert (status == 0, "invariant") ; 5757 } 5758} 5759 5760 5761/* Darwin has no "environ" in a dynamic library. */ 5762#ifdef __APPLE__ 5763#include <crt_externs.h> 5764#define environ (*_NSGetEnviron()) 5765#else 5766extern char** environ; 5767#endif 5768 5769// Run the specified command in a separate process. Return its exit value, 5770// or -1 on failure (e.g. can't fork a new process). 5771// Unlike system(), this function can be called from signal handler. It 5772// doesn't block SIGINT et al. 5773int os::fork_and_exec(char* cmd) { 5774 const char * argv[4] = {"sh", "-c", cmd, NULL}; 5775 5776 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 5777 // pthread_atfork handlers and reset pthread library. All we need is a 5778 // separate process to execve. Make a direct syscall to fork process. 5779 // On IA64 there's no fork syscall, we have to use fork() and hope for 5780 // the best... 5781 pid_t pid = fork(); 5782 5783 if (pid < 0) { 5784 // fork failed 5785 return -1; 5786 5787 } else if (pid == 0) { 5788 // child process 5789 5790 // execve() in BsdThreads will call pthread_kill_other_threads_np() 5791 // first to kill every thread on the thread list. Because this list is 5792 // not reset by fork() (see notes above), execve() will instead kill 5793 // every thread in the parent process. We know this is the only thread 5794 // in the new process, so make a system call directly. 5795 // IA64 should use normal execve() from glibc to match the glibc fork() 5796 // above. 5797 execve("/bin/sh", (char* const*)argv, environ); 5798 5799 // execve failed 5800 _exit(-1); 5801 5802 } else { 5803 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5804 // care about the actual exit code, for now. 5805 5806 int status; 5807 5808 // Wait for the child process to exit. This returns immediately if 5809 // the child has already exited. */ 5810 while (waitpid(pid, &status, 0) < 0) { 5811 switch (errno) { 5812 case ECHILD: return 0; 5813 case EINTR: break; 5814 default: return -1; 5815 } 5816 } 5817 5818 if (WIFEXITED(status)) { 5819 // The child exited normally; get its exit code. 5820 return WEXITSTATUS(status); 5821 } else if (WIFSIGNALED(status)) { 5822 // The child exited because of a signal 5823 // The best value to return is 0x80 + signal number, 5824 // because that is what all Unix shells do, and because 5825 // it allows callers to distinguish between process exit and 5826 // process death by signal. 5827 return 0x80 + WTERMSIG(status); 5828 } else { 5829 // Unknown exit code; pass it through 5830 return status; 5831 } 5832 } 5833} 5834 5835// is_headless_jre() 5836// 5837// Test for the existence of xawt/libmawt.so or libawt_xawt.so 5838// in order to report if we are running in a headless jre 5839// 5840// Since JDK8 xawt/libmawt.so was moved into the same directory 5841// as libawt.so, and renamed libawt_xawt.so 5842// 5843bool os::is_headless_jre() { 5844 struct stat statbuf; 5845 char buf[MAXPATHLEN]; 5846 char libmawtpath[MAXPATHLEN]; 5847 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 5848 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 5849 char *p; 5850 5851 // Get path to libjvm.so 5852 os::jvm_path(buf, sizeof(buf)); 5853 5854 // Get rid of libjvm.so 5855 p = strrchr(buf, '/'); 5856 if (p == NULL) return false; 5857 else *p = '\0'; 5858 5859 // Get rid of client or server 5860 p = strrchr(buf, '/'); 5861 if (p == NULL) return false; 5862 else *p = '\0'; 5863 5864 // check xawt/libmawt.so 5865 strcpy(libmawtpath, buf); 5866 strcat(libmawtpath, xawtstr); 5867 if (::stat(libmawtpath, &statbuf) == 0) return false; 5868 5869 // check libawt_xawt.so 5870 strcpy(libmawtpath, buf); 5871 strcat(libmawtpath, new_xawtstr); 5872 if (::stat(libmawtpath, &statbuf) == 0) return false; 5873 5874 return true; 5875} 5876