os_bsd.cpp revision 4820:a837fa3d3f86
10SN/A/* 2157SN/A * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 30SN/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 40SN/A * 50SN/A * This code is free software; you can redistribute it and/or modify it 60SN/A * under the terms of the GNU General Public License version 2 only, as 7157SN/A * published by the Free Software Foundation. 80SN/A * 9157SN/A * This code is distributed in the hope that it will be useful, but WITHOUT 100SN/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 110SN/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 120SN/A * version 2 for more details (a copy is included in the LICENSE file that 130SN/A * accompanied this code). 140SN/A * 150SN/A * You should have received a copy of the GNU General Public License version 160SN/A * 2 along with this work; if not, write to the Free Software Foundation, 170SN/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 180SN/A * 190SN/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 200SN/A * or visit www.oracle.com if you need additional information or have any 21157SN/A * questions. 22157SN/A * 23157SN/A */ 240SN/A 250SN/A// no precompiled headers 260SN/A#include "classfile/classLoader.hpp" 270SN/A#include "classfile/systemDictionary.hpp" 280SN/A#include "classfile/vmSymbols.hpp" 290SN/A#include "code/icBuffer.hpp" 300SN/A#include "code/vtableStubs.hpp" 310SN/A#include "compiler/compileBroker.hpp" 320SN/A#include "compiler/disassembler.hpp" 330SN/A#include "interpreter/interpreter.hpp" 340SN/A#include "jvm_bsd.h" 350SN/A#include "memory/allocation.inline.hpp" 360SN/A#include "memory/filemap.hpp" 370SN/A#include "mutex_bsd.inline.hpp" 380SN/A#include "oops/oop.inline.hpp" 390SN/A#include "os_share_bsd.hpp" 400SN/A#include "prims/jniFastGetField.hpp" 410SN/A#include "prims/jvm.h" 420SN/A#include "prims/jvm_misc.hpp" 430SN/A#include "runtime/arguments.hpp" 440SN/A#include "runtime/extendedPC.hpp" 450SN/A#include "runtime/globals.hpp" 460SN/A#include "runtime/interfaceSupport.hpp" 470SN/A#include "runtime/java.hpp" 480SN/A#include "runtime/javaCalls.hpp" 490SN/A#include "runtime/mutexLocker.hpp" 500SN/A#include "runtime/objectMonitor.hpp" 510SN/A#include "runtime/osThread.hpp" 520SN/A#include "runtime/perfMemory.hpp" 530SN/A#include "runtime/sharedRuntime.hpp" 540SN/A#include "runtime/statSampler.hpp" 550SN/A#include "runtime/stubRoutines.hpp" 560SN/A#include "runtime/thread.inline.hpp" 570SN/A#include "runtime/threadCritical.hpp" 580SN/A#include "runtime/timer.hpp" 590SN/A#include "services/attachListener.hpp" 600SN/A#include "services/memTracker.hpp" 610SN/A#include "services/runtimeService.hpp" 620SN/A#include "utilities/decoder.hpp" 630SN/A#include "utilities/defaultStream.hpp" 640SN/A#include "utilities/events.hpp" 650SN/A#include "utilities/growableArray.hpp" 660SN/A#include "utilities/vmError.hpp" 670SN/A 680SN/A// put OS-includes here 690SN/A# include <sys/types.h> 700SN/A# include <sys/mman.h> 710SN/A# include <sys/stat.h> 720SN/A# include <sys/select.h> 730SN/A# include <pthread.h> 740SN/A# include <signal.h> 750SN/A# include <errno.h> 760SN/A# include <dlfcn.h> 770SN/A# include <stdio.h> 780SN/A# include <unistd.h> 790SN/A# include <sys/resource.h> 800SN/A# include <pthread.h> 810SN/A# include <sys/stat.h> 820SN/A# include <sys/time.h> 830SN/A# include <sys/times.h> 840SN/A# include <sys/utsname.h> 850SN/A# include <sys/socket.h> 860SN/A# include <sys/wait.h> 870SN/A# include <time.h> 880SN/A# include <pwd.h> 890SN/A# include <poll.h> 900SN/A# include <semaphore.h> 910SN/A# include <fcntl.h> 920SN/A# include <string.h> 930SN/A# include <sys/param.h> 940SN/A# include <sys/sysctl.h> 950SN/A# include <sys/ipc.h> 960SN/A# include <sys/shm.h> 970SN/A#ifndef __APPLE__ 980SN/A# include <link.h> 990SN/A#endif 1000SN/A# include <stdint.h> 1010SN/A# include <inttypes.h> 1020SN/A# include <sys/ioctl.h> 1030SN/A 1040SN/A#if defined(__FreeBSD__) || defined(__NetBSD__) 1050SN/A# include <elf.h> 1060SN/A#endif 1070SN/A 1080SN/A#ifdef __APPLE__ 1090SN/A# include <mach/mach.h> // semaphore_* API 1100SN/A# include <mach-o/dyld.h> 1110SN/A# include <sys/proc_info.h> 1120SN/A# include <objc/objc-auto.h> 1130SN/A#endif 1140SN/A 1150SN/A#ifndef MAP_ANONYMOUS 1160SN/A#define MAP_ANONYMOUS MAP_ANON 1170SN/A#endif 1180SN/A 1190SN/A#define MAX_PATH (2 * K) 1200SN/A 1210SN/A// for timer info max values which include all bits 1220SN/A#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 1230SN/A 1240SN/A#define LARGEPAGES_BIT (1 << 6) 1250SN/A//////////////////////////////////////////////////////////////////////////////// 1260SN/A// global variables 1270SN/Ajulong os::Bsd::_physical_memory = 0; 1280SN/A 1290SN/A 1300SN/Aint (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 1310SN/Apthread_t os::Bsd::_main_thread; 1320SN/Aint os::Bsd::_page_size = -1; 1330SN/A 1340SN/Astatic jlong initial_time_count=0; 1350SN/A 1360SN/Astatic int clock_tics_per_sec = 100; 1370SN/A 1380SN/A// For diagnostics to print a message once. see run_periodic_checks 1390SN/Astatic sigset_t check_signal_done; 1400SN/Astatic bool check_signals = true; 1410SN/A 1420SN/Astatic pid_t _initial_pid = 0; 1430SN/A 1440SN/A/* Signal number used to suspend/resume a thread */ 1450SN/A 1460SN/A/* do not use any signal number less than SIGSEGV, see 4355769 */ 1470SN/Astatic int SR_signum = SIGUSR2; 1480SN/Asigset_t SR_sigset; 1490SN/A 1500SN/A 1510SN/A//////////////////////////////////////////////////////////////////////////////// 1520SN/A// utility functions 1530SN/A 1540SN/Astatic int SR_initialize(); 1550SN/A 1560SN/Ajulong os::available_memory() { 1570SN/A return Bsd::available_memory(); 1580SN/A} 1590SN/A 1600SN/Ajulong os::Bsd::available_memory() { 1610SN/A // XXXBSD: this is just a stopgap implementation 1620SN/A return physical_memory() >> 2; 1630SN/A} 1640SN/A 1650SN/Ajulong os::physical_memory() { 1660SN/A return Bsd::physical_memory(); 1670SN/A} 1680SN/A 1690SN/A//////////////////////////////////////////////////////////////////////////////// 1700SN/A// environment support 1710SN/A 1720SN/Abool os::getenv(const char* name, char* buf, int len) { 1730SN/A const char* val = ::getenv(name); 1740SN/A if (val != NULL && strlen(val) < (size_t)len) { 1750SN/A strcpy(buf, val); 1760SN/A return true; 1770SN/A } 1780SN/A if (len > 0) buf[0] = 0; // return a null string 1790SN/A return false; 1800SN/A} 1810SN/A 1820SN/A 1830SN/A// Return true if user is running as root. 1840SN/A 1850SN/Abool os::have_special_privileges() { 1860SN/A static bool init = false; 1870SN/A static bool privileges = false; 1880SN/A if (!init) { 1890SN/A privileges = (getuid() != geteuid()) || (getgid() != getegid()); 1900SN/A init = true; 1910SN/A } 1920SN/A return privileges; 1930SN/A} 1940SN/A 1950SN/A 1960SN/A 1970SN/A// Cpu architecture string 1980SN/A#if defined(ZERO) 1990SN/Astatic char cpu_arch[] = ZERO_LIBARCH; 2000SN/A#elif defined(IA64) 2010SN/Astatic char cpu_arch[] = "ia64"; 2020SN/A#elif defined(IA32) 2030SN/Astatic char cpu_arch[] = "i386"; 2040SN/A#elif defined(AMD64) 2050SN/Astatic char cpu_arch[] = "amd64"; 2060SN/A#elif defined(ARM) 2070SN/Astatic char cpu_arch[] = "arm"; 2080SN/A#elif defined(PPC) 2090SN/Astatic char cpu_arch[] = "ppc"; 2100SN/A#elif defined(SPARC) 2110SN/A# ifdef _LP64 2120SN/Astatic char cpu_arch[] = "sparcv9"; 2130SN/A# else 2140SN/Astatic char cpu_arch[] = "sparc"; 2150SN/A# endif 2160SN/A#else 2170SN/A#error Add appropriate cpu_arch setting 2180SN/A#endif 2190SN/A 2200SN/A// Compiler variant 2210SN/A#ifdef COMPILER2 2220SN/A#define COMPILER_VARIANT "server" 2230SN/A#else 2240SN/A#define COMPILER_VARIANT "client" 2250SN/A#endif 2260SN/A 2270SN/A 2280SN/Avoid os::Bsd::initialize_system_info() { 2290SN/A int mib[2]; 2300SN/A size_t len; 2310SN/A int cpu_val; 2320SN/A julong mem_val; 2330SN/A 2340SN/A /* get processors count via hw.ncpus sysctl */ 2350SN/A mib[0] = CTL_HW; 2360SN/A mib[1] = HW_NCPU; 2370SN/A len = sizeof(cpu_val); 2380SN/A if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 2390SN/A assert(len == sizeof(cpu_val), "unexpected data size"); 2400SN/A set_processor_count(cpu_val); 2410SN/A } 2420SN/A else { 2430SN/A set_processor_count(1); // fallback 2440SN/A } 2450SN/A 2460SN/A /* get physical memory via hw.memsize sysctl (hw.memsize is used 2470SN/A * since it returns a 64 bit value) 2480SN/A */ 2490SN/A mib[0] = CTL_HW; 2500SN/A mib[1] = HW_MEMSIZE; 2510SN/A len = sizeof(mem_val); 2520SN/A if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 2530SN/A assert(len == sizeof(mem_val), "unexpected data size"); 2540SN/A _physical_memory = mem_val; 2550SN/A } else { 2560SN/A _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 2570SN/A } 2580SN/A 2590SN/A#ifdef __OpenBSD__ 2600SN/A { 2610SN/A // limit _physical_memory memory view on OpenBSD since 2620SN/A // datasize rlimit restricts us anyway. 2630SN/A struct rlimit limits; 2640SN/A getrlimit(RLIMIT_DATA, &limits); 2650SN/A _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 2660SN/A } 2670SN/A#endif 2680SN/A} 2690SN/A 2700SN/A#ifdef __APPLE__ 2710SN/Astatic const char *get_home() { 2720SN/A const char *home_dir = ::getenv("HOME"); 2730SN/A if ((home_dir == NULL) || (*home_dir == '\0')) { 2740SN/A struct passwd *passwd_info = getpwuid(geteuid()); 2750SN/A if (passwd_info != NULL) { 2760SN/A home_dir = passwd_info->pw_dir; 2770SN/A } 2780SN/A } 2790SN/A 2800SN/A return home_dir; 2810SN/A} 2820SN/A#endif 2830SN/A 2840SN/Avoid os::init_system_properties_values() { 2850SN/A// char arch[12]; 2860SN/A// sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 2870SN/A 2880SN/A // The next steps are taken in the product version: 2890SN/A // 2900SN/A // Obtain the JAVA_HOME value from the location of libjvm.so. 2910SN/A // This library should be located at: 2920SN/A // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 2930SN/A // 2940SN/A // If "/jre/lib/" appears at the right place in the path, then we 2950SN/A // assume libjvm.so is installed in a JDK and we use this path. 2960SN/A // 2970SN/A // Otherwise exit with message: "Could not create the Java virtual machine." 2980SN/A // 2990SN/A // The following extra steps are taken in the debugging version: 3000SN/A // 3010SN/A // If "/jre/lib/" does NOT appear at the right place in the path 3020SN/A // instead of exit check for $JAVA_HOME environment variable. 3030SN/A // 3040SN/A // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 3050SN/A // then we append a fake suffix "hotspot/libjvm.so" to this path so 3060SN/A // it looks like libjvm.so is installed there 3070SN/A // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 3080SN/A // 3090SN/A // Otherwise exit. 3100SN/A // 3110SN/A // Important note: if the location of libjvm.so changes this 3120SN/A // code needs to be changed accordingly. 3130SN/A 3140SN/A // The next few definitions allow the code to be verbatim: 3150SN/A#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 3160SN/A#define getenv(n) ::getenv(n) 3170SN/A 3180SN/A/* 3190SN/A * See ld(1): 3200SN/A * The linker uses the following search paths to locate required 3210SN/A * shared libraries: 3220SN/A * 1: ... 3230SN/A * ... 3240SN/A * 7: The default directories, normally /lib and /usr/lib. 3250SN/A */ 3260SN/A#ifndef DEFAULT_LIBPATH 3270SN/A#define DEFAULT_LIBPATH "/lib:/usr/lib" 3280SN/A#endif 3290SN/A 3300SN/A#define EXTENSIONS_DIR "/lib/ext" 3310SN/A#define ENDORSED_DIR "/lib/endorsed" 3320SN/A#define REG_DIR "/usr/java/packages" 3330SN/A 3340SN/A#ifdef __APPLE__ 3350SN/A#define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 3360SN/A#define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 3370SN/A const char *user_home_dir = get_home(); 3380SN/A // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 3390SN/A int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 3400SN/A sizeof(SYS_EXTENSIONS_DIRS); 3410SN/A#endif 3420SN/A 3430SN/A { 3440SN/A /* sysclasspath, java_home, dll_dir */ 3450SN/A { 3460SN/A char *home_path; 3470SN/A char *dll_path; 3480SN/A char *pslash; 3490SN/A char buf[MAXPATHLEN]; 3500SN/A os::jvm_path(buf, sizeof(buf)); 3510SN/A 3520SN/A // Found the full path to libjvm.so. 3530SN/A // Now cut the path to <java_home>/jre if we can. 3540SN/A *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 3550SN/A pslash = strrchr(buf, '/'); 3560SN/A if (pslash != NULL) 3570SN/A *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 3580SN/A dll_path = malloc(strlen(buf) + 1); 3590SN/A if (dll_path == NULL) 3600SN/A return; 3610SN/A strcpy(dll_path, buf); 3620SN/A Arguments::set_dll_dir(dll_path); 3630SN/A 3640SN/A if (pslash != NULL) { 3650SN/A pslash = strrchr(buf, '/'); 3660SN/A if (pslash != NULL) { 3670SN/A *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 3680SN/A#ifndef __APPLE__ 3690SN/A pslash = strrchr(buf, '/'); 3700SN/A if (pslash != NULL) 3710SN/A *pslash = '\0'; /* get rid of /lib */ 3720SN/A#endif 3730SN/A } 3740SN/A } 3750SN/A 3760SN/A home_path = malloc(strlen(buf) + 1); 3770SN/A if (home_path == NULL) 3780SN/A return; 3790SN/A strcpy(home_path, buf); 3800SN/A Arguments::set_java_home(home_path); 3810SN/A 3820SN/A if (!set_boot_path('/', ':')) 3830SN/A return; 3840SN/A } 3850SN/A 3860SN/A /* 3870SN/A * Where to look for native libraries 3880SN/A * 3890SN/A * Note: Due to a legacy implementation, most of the library path 3900SN/A * is set in the launcher. This was to accomodate linking restrictions 3910SN/A * on legacy Bsd implementations (which are no longer supported). 3920SN/A * Eventually, all the library path setting will be done here. 3930SN/A * 3940SN/A * However, to prevent the proliferation of improperly built native 3950SN/A * libraries, the new path component /usr/java/packages is added here. 3960SN/A * Eventually, all the library path setting will be done here. 3970SN/A */ 3980SN/A { 3990SN/A char *ld_library_path; 4000SN/A 4010SN/A /* 4020SN/A * Construct the invariant part of ld_library_path. Note that the 4030SN/A * space for the colon and the trailing null are provided by the 4040SN/A * nulls included by the sizeof operator (so actually we allocate 4050SN/A * a byte more than necessary). 4060SN/A */ 4070SN/A#ifdef __APPLE__ 4080SN/A ld_library_path = (char *) malloc(system_ext_size); 4090SN/A sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 4100SN/A#else 4110SN/A ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 4120SN/A strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 4130SN/A sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 4140SN/A#endif 4150SN/A 4160SN/A /* 4170SN/A * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 4180SN/A * should always exist (until the legacy problem cited above is 4190SN/A * addressed). 4200SN/A */ 4210SN/A#ifdef __APPLE__ 4220SN/A // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 4230SN/A char *l = getenv("JAVA_LIBRARY_PATH"); 4240SN/A if (l != NULL) { 4250SN/A char *t = ld_library_path; 4260SN/A /* That's +1 for the colon and +1 for the trailing '\0' */ 4270SN/A ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 4280SN/A sprintf(ld_library_path, "%s:%s", l, t); 4290SN/A free(t); 4300SN/A } 4310SN/A 4320SN/A char *v = getenv("DYLD_LIBRARY_PATH"); 4330SN/A#else 4340SN/A char *v = getenv("LD_LIBRARY_PATH"); 4350SN/A#endif 4360SN/A if (v != NULL) { 4370SN/A char *t = ld_library_path; 4380SN/A /* That's +1 for the colon and +1 for the trailing '\0' */ 4390SN/A ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 4400SN/A sprintf(ld_library_path, "%s:%s", v, t); 4410SN/A free(t); 4420SN/A } 4430SN/A 4440SN/A#ifdef __APPLE__ 4450SN/A // Apple's Java6 has "." at the beginning of java.library.path. 4460SN/A // OpenJDK on Windows has "." at the end of java.library.path. 4470SN/A // OpenJDK on Linux and Solaris don't have "." in java.library.path 4480SN/A // at all. To ease the transition from Apple's Java6 to OpenJDK7, 4490SN/A // "." is appended to the end of java.library.path. Yes, this 4500SN/A // could cause a change in behavior, but Apple's Java6 behavior 4510SN/A // can be achieved by putting "." at the beginning of the 4520SN/A // JAVA_LIBRARY_PATH environment variable. 4530SN/A { 4540SN/A char *t = ld_library_path; 4550SN/A // that's +3 for appending ":." and the trailing '\0' 4560SN/A ld_library_path = (char *) malloc(strlen(t) + 3); 4570SN/A sprintf(ld_library_path, "%s:%s", t, "."); 4580SN/A free(t); 4590SN/A } 4600SN/A#endif 4610SN/A 4620SN/A Arguments::set_library_path(ld_library_path); 4630SN/A } 4640SN/A 4650SN/A /* 4660SN/A * Extensions directories. 4670SN/A * 4680SN/A * Note that the space for the colon and the trailing null are provided 4690SN/A * by the nulls included by the sizeof operator (so actually one byte more 4700SN/A * than necessary is allocated). 4710SN/A */ 4720SN/A { 4730SN/A#ifdef __APPLE__ 4740SN/A char *buf = malloc(strlen(Arguments::get_java_home()) + 4750SN/A sizeof(EXTENSIONS_DIR) + system_ext_size); 4760SN/A sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 4770SN/A SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 4780SN/A#else 4790SN/A char *buf = malloc(strlen(Arguments::get_java_home()) + 4800SN/A sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 4810SN/A sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 4820SN/A Arguments::get_java_home()); 4830SN/A#endif 4840SN/A 4850SN/A Arguments::set_ext_dirs(buf); 4860SN/A } 4870SN/A 4880SN/A /* Endorsed standards default directory. */ 4890SN/A { 4900SN/A char * buf; 4910SN/A buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 4920SN/A sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 4930SN/A Arguments::set_endorsed_dirs(buf); 4940SN/A } 4950SN/A } 4960SN/A 4970SN/A#ifdef __APPLE__ 4980SN/A#undef SYS_EXTENSIONS_DIR 4990SN/A#endif 5000SN/A#undef malloc 5010SN/A#undef getenv 5020SN/A#undef EXTENSIONS_DIR 5030SN/A#undef ENDORSED_DIR 5040SN/A 5050SN/A // Done 5060SN/A return; 5070SN/A} 5080SN/A 5090SN/A//////////////////////////////////////////////////////////////////////////////// 5100SN/A// breakpoint support 5110SN/A 5120SN/Avoid os::breakpoint() { 5130SN/A BREAKPOINT; 5140SN/A} 5150SN/A 5160SN/Aextern "C" void breakpoint() { 5170SN/A // use debugger to set breakpoint here 5180SN/A} 5190SN/A 5200SN/A//////////////////////////////////////////////////////////////////////////////// 5210SN/A// signal support 5220SN/A 5230SN/Adebug_only(static bool signal_sets_initialized = false); 5240SN/Astatic sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 5250SN/A 5260SN/Abool os::Bsd::is_sig_ignored(int sig) { 5270SN/A struct sigaction oact; 5280SN/A sigaction(sig, (struct sigaction*)NULL, &oact); 5290SN/A void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 5300SN/A : CAST_FROM_FN_PTR(void*, oact.sa_handler); 5310SN/A if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 5320SN/A return true; 5330SN/A else 5340SN/A return false; 5350SN/A} 5360SN/A 5370SN/Avoid os::Bsd::signal_sets_init() { 5380SN/A // Should also have an assertion stating we are still single-threaded. 5390SN/A assert(!signal_sets_initialized, "Already initialized"); 5400SN/A // Fill in signals that are necessarily unblocked for all threads in 5410SN/A // the VM. Currently, we unblock the following signals: 5420SN/A // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 5430SN/A // by -Xrs (=ReduceSignalUsage)); 5440SN/A // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 5450SN/A // other threads. The "ReduceSignalUsage" boolean tells us not to alter 5460SN/A // the dispositions or masks wrt these signals. 5470SN/A // Programs embedding the VM that want to use the above signals for their 5480SN/A // own purposes must, at this time, use the "-Xrs" option to prevent 5490SN/A // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 5500SN/A // (See bug 4345157, and other related bugs). 5510SN/A // In reality, though, unblocking these signals is really a nop, since 5520SN/A // these signals are not blocked by default. 5530SN/A sigemptyset(&unblocked_sigs); 5540SN/A sigemptyset(&allowdebug_blocked_sigs); 5550SN/A sigaddset(&unblocked_sigs, SIGILL); 5560SN/A sigaddset(&unblocked_sigs, SIGSEGV); 5570SN/A sigaddset(&unblocked_sigs, SIGBUS); 5580SN/A sigaddset(&unblocked_sigs, SIGFPE); 5590SN/A sigaddset(&unblocked_sigs, SR_signum); 5600SN/A 5610SN/A if (!ReduceSignalUsage) { 5620SN/A if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 5630SN/A sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 5640SN/A sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 5650SN/A } 5660SN/A if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 5670SN/A sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 5680SN/A sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 5690SN/A } 5700SN/A if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 5710SN/A sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 5720SN/A sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 5730SN/A } 5740SN/A } 5750SN/A // Fill in signals that are blocked by all but the VM thread. 5760SN/A sigemptyset(&vm_sigs); 5770SN/A if (!ReduceSignalUsage) 5780SN/A sigaddset(&vm_sigs, BREAK_SIGNAL); 5790SN/A debug_only(signal_sets_initialized = true); 5800SN/A 5810SN/A} 5820SN/A 5830SN/A// These are signals that are unblocked while a thread is running Java. 5840SN/A// (For some reason, they get blocked by default.) 5850SN/Asigset_t* os::Bsd::unblocked_signals() { 5860SN/A assert(signal_sets_initialized, "Not initialized"); 5870SN/A return &unblocked_sigs; 5880SN/A} 5890SN/A 5900SN/A// These are the signals that are blocked while a (non-VM) thread is 5910SN/A// running Java. Only the VM thread handles these signals. 5920SN/Asigset_t* os::Bsd::vm_signals() { 5930SN/A assert(signal_sets_initialized, "Not initialized"); 5940SN/A return &vm_sigs; 5950SN/A} 5960SN/A 5970SN/A// These are signals that are blocked during cond_wait to allow debugger in 5980SN/Asigset_t* os::Bsd::allowdebug_blocked_signals() { 5990SN/A assert(signal_sets_initialized, "Not initialized"); 6000SN/A return &allowdebug_blocked_sigs; 6010SN/A} 6020SN/A 6030SN/Avoid os::Bsd::hotspot_sigmask(Thread* thread) { 6040SN/A 6050SN/A //Save caller's signal mask before setting VM signal mask 6060SN/A sigset_t caller_sigmask; 6070SN/A pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 6080SN/A 6090SN/A OSThread* osthread = thread->osthread(); 6100SN/A osthread->set_caller_sigmask(caller_sigmask); 6110SN/A 6120SN/A pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 6130SN/A 6140SN/A if (!ReduceSignalUsage) { 6150SN/A if (thread->is_VM_thread()) { 6160SN/A // Only the VM thread handles BREAK_SIGNAL ... 6170SN/A pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 6180SN/A } else { 6190SN/A // ... all other threads block BREAK_SIGNAL 6200SN/A pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 6210SN/A } 6220SN/A } 6230SN/A} 6240SN/A 6250SN/A 6260SN/A////////////////////////////////////////////////////////////////////////////// 6270SN/A// create new thread 6280SN/A 6290SN/A// check if it's safe to start a new thread 6300SN/Astatic bool _thread_safety_check(Thread* thread) { 6310SN/A return true; 6320SN/A} 6330SN/A 6340SN/A#ifdef __APPLE__ 6350SN/A// library handle for calling objc_registerThreadWithCollector() 6360SN/A// without static linking to the libobjc library 6370SN/A#define OBJC_LIB "/usr/lib/libobjc.dylib" 6380SN/A#define OBJC_GCREGISTER "objc_registerThreadWithCollector" 6390SN/Atypedef void (*objc_registerThreadWithCollector_t)(); 6400SN/Aextern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 6410SN/Aobjc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 6420SN/A#endif 6430SN/A 6440SN/A#ifdef __APPLE__ 6450SN/Astatic uint64_t locate_unique_thread_id() { 6460SN/A // Additional thread_id used to correlate threads in SA 6470SN/A thread_identifier_info_data_t m_ident_info; 6480SN/A mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 6490SN/A 6500SN/A thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, 6510SN/A (thread_info_t) &m_ident_info, &count); 6520SN/A return m_ident_info.thread_id; 6530SN/A} 6540SN/A#endif 6550SN/A 6560SN/A// Thread start routine for all newly created threads 6570SN/Astatic void *java_start(Thread *thread) { 6580SN/A // Try to randomize the cache line index of hot stack frames. 6590SN/A // This helps when threads of the same stack traces evict each other's 6600SN/A // cache lines. The threads can be either from the same JVM instance, or 6610SN/A // from different JVM instances. The benefit is especially true for 6620SN/A // processors with hyperthreading technology. 6630SN/A static int counter = 0; 6640SN/A int pid = os::current_process_id(); 6650SN/A alloca(((pid ^ counter++) & 7) * 128); 6660SN/A 6670SN/A ThreadLocalStorage::set_thread(thread); 6680SN/A 6690SN/A OSThread* osthread = thread->osthread(); 6700SN/A Monitor* sync = osthread->startThread_lock(); 6710SN/A 6720SN/A // non floating stack BsdThreads needs extra check, see above 6730SN/A if (!_thread_safety_check(thread)) { 6740SN/A // notify parent thread 6750SN/A MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 6760SN/A osthread->set_state(ZOMBIE); 6770SN/A sync->notify_all(); 6780SN/A return NULL; 6790SN/A } 6800SN/A 6810SN/A#ifdef __APPLE__ 6820SN/A // thread_id is mach thread on macos 6830SN/A osthread->set_thread_id(::mach_thread_self()); 6840SN/A osthread->set_unique_thread_id(locate_unique_thread_id()); 6850SN/A#else 6860SN/A // thread_id is pthread_id on BSD 6870SN/A osthread->set_thread_id(::pthread_self()); 6880SN/A#endif 6890SN/A // initialize signal mask for this thread 6900SN/A os::Bsd::hotspot_sigmask(thread); 6910SN/A 6920SN/A // initialize floating point control register 6930SN/A os::Bsd::init_thread_fpu_state(); 6940SN/A 6950SN/A#ifdef __APPLE__ 6960SN/A // register thread with objc gc 6970SN/A if (objc_registerThreadWithCollectorFunction != NULL) { 6980SN/A objc_registerThreadWithCollectorFunction(); 6990SN/A } 7000SN/A#endif 7010SN/A 7020SN/A // handshaking with parent thread 7030SN/A { 7040SN/A MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 7050SN/A 7060SN/A // notify parent thread 7070SN/A osthread->set_state(INITIALIZED); 7080SN/A sync->notify_all(); 7090SN/A 7100SN/A // wait until os::start_thread() 7110SN/A while (osthread->get_state() == INITIALIZED) { 7120SN/A sync->wait(Mutex::_no_safepoint_check_flag); 7130SN/A } 7140SN/A } 7150SN/A 7160SN/A // call one more level start routine 7170SN/A thread->run(); 7180SN/A 7190SN/A return 0; 7200SN/A} 7210SN/A 7220SN/Abool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 7230SN/A assert(thread->osthread() == NULL, "caller responsible"); 7240SN/A 7250SN/A // Allocate the OSThread object 7260SN/A OSThread* osthread = new OSThread(NULL, NULL); 7270SN/A if (osthread == NULL) { 7280SN/A return false; 7290SN/A } 7300SN/A 7310SN/A // set the correct thread state 7320SN/A osthread->set_thread_type(thr_type); 7330SN/A 7340SN/A // Initial state is ALLOCATED but not INITIALIZED 7350SN/A osthread->set_state(ALLOCATED); 7360SN/A 7370SN/A thread->set_osthread(osthread); 7380SN/A 7390SN/A // init thread attributes 7400SN/A pthread_attr_t attr; 7410SN/A pthread_attr_init(&attr); 7420SN/A pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 7430SN/A 7440SN/A // stack size 7450SN/A if (os::Bsd::supports_variable_stack_size()) { 7460SN/A // calculate stack size if it's not specified by caller 7470SN/A if (stack_size == 0) { 7480SN/A stack_size = os::Bsd::default_stack_size(thr_type); 7490SN/A 7500SN/A switch (thr_type) { 7510SN/A case os::java_thread: 7520SN/A // Java threads use ThreadStackSize which default value can be 7530SN/A // changed with the flag -Xss 7540SN/A assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 7550SN/A stack_size = JavaThread::stack_size_at_create(); 7560SN/A break; 7570SN/A case os::compiler_thread: 7580SN/A if (CompilerThreadStackSize > 0) { 7590SN/A stack_size = (size_t)(CompilerThreadStackSize * K); 7600SN/A break; 7610SN/A } // else fall through: 7620SN/A // use VMThreadStackSize if CompilerThreadStackSize is not defined 7630SN/A case os::vm_thread: 7640SN/A case os::pgc_thread: 7650SN/A case os::cgc_thread: 7660SN/A case os::watcher_thread: 7670SN/A if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 7680SN/A break; 7690SN/A } 7700SN/A } 7710SN/A 7720SN/A stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 7730SN/A pthread_attr_setstacksize(&attr, stack_size); 7740SN/A } else { 7750SN/A // let pthread_create() pick the default value. 7760SN/A } 7770SN/A 7780SN/A ThreadState state; 7790SN/A 7800SN/A { 7810SN/A pthread_t tid; 7820SN/A int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 7830SN/A 7840SN/A pthread_attr_destroy(&attr); 7850SN/A 7860SN/A if (ret != 0) { 7870SN/A if (PrintMiscellaneous && (Verbose || WizardMode)) { 7880SN/A perror("pthread_create()"); 7890SN/A } 7900SN/A // Need to clean up stuff we've allocated so far 7910SN/A thread->set_osthread(NULL); 7920SN/A delete osthread; 7930SN/A return false; 7940SN/A } 7950SN/A 7960SN/A // Store pthread info into the OSThread 7970SN/A osthread->set_pthread_id(tid); 7980SN/A 7990SN/A // Wait until child thread is either initialized or aborted 8000SN/A { 8010SN/A Monitor* sync_with_child = osthread->startThread_lock(); 8020SN/A MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 8030SN/A while ((state = osthread->get_state()) == ALLOCATED) { 8040SN/A sync_with_child->wait(Mutex::_no_safepoint_check_flag); 8050SN/A } 8060SN/A } 8070SN/A 8080SN/A } 8090SN/A 8100SN/A // Aborted due to thread limit being reached 8110SN/A if (state == ZOMBIE) { 8120SN/A thread->set_osthread(NULL); 8130SN/A delete osthread; 8140SN/A return false; 8150SN/A } 8160SN/A 8170SN/A // The thread is returned suspended (in state INITIALIZED), 8180SN/A // and is started higher up in the call chain 8190SN/A assert(state == INITIALIZED, "race condition"); 8200SN/A return true; 8210SN/A} 8220SN/A 8230SN/A///////////////////////////////////////////////////////////////////////////// 8240SN/A// attach existing thread 8250SN/A 8260SN/A// bootstrap the main thread 8270SN/Abool os::create_main_thread(JavaThread* thread) { 8280SN/A assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 8290SN/A return create_attached_thread(thread); 8300SN/A} 8310SN/A 8320SN/Abool os::create_attached_thread(JavaThread* thread) { 8330SN/A#ifdef ASSERT 8340SN/A thread->verify_not_published(); 8350SN/A#endif 8360SN/A 8370SN/A // Allocate the OSThread object 8380SN/A OSThread* osthread = new OSThread(NULL, NULL); 8390SN/A 8400SN/A if (osthread == NULL) { 8410SN/A return false; 8420SN/A } 8430SN/A 8440SN/A // Store pthread info into the OSThread 8450SN/A#ifdef __APPLE__ 8460SN/A osthread->set_thread_id(::mach_thread_self()); 8470SN/A osthread->set_unique_thread_id(locate_unique_thread_id()); 8480SN/A#else 8490SN/A osthread->set_thread_id(::pthread_self()); 8500SN/A#endif 8510SN/A osthread->set_pthread_id(::pthread_self()); 8520SN/A 8530SN/A // initialize floating point control register 8540SN/A os::Bsd::init_thread_fpu_state(); 8550SN/A 8560SN/A // Initial thread state is RUNNABLE 8570SN/A osthread->set_state(RUNNABLE); 8580SN/A 8590SN/A thread->set_osthread(osthread); 8600SN/A 8610SN/A // initialize signal mask for this thread 8620SN/A // and save the caller's signal mask 8630SN/A os::Bsd::hotspot_sigmask(thread); 8640SN/A 8650SN/A return true; 8660SN/A} 8670SN/A 8680SN/Avoid os::pd_start_thread(Thread* thread) { 8690SN/A OSThread * osthread = thread->osthread(); 8700SN/A assert(osthread->get_state() != INITIALIZED, "just checking"); 8710SN/A Monitor* sync_with_child = osthread->startThread_lock(); 8720SN/A MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 8730SN/A sync_with_child->notify(); 8740SN/A} 8750SN/A 8760SN/A// Free Bsd resources related to the OSThread 8770SN/Avoid os::free_thread(OSThread* osthread) { 8780SN/A assert(osthread != NULL, "osthread not set"); 8790SN/A 8800SN/A if (Thread::current()->osthread() == osthread) { 8810SN/A // Restore caller's signal mask 8820SN/A sigset_t sigmask = osthread->caller_sigmask(); 8830SN/A pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 8840SN/A } 8850SN/A 8860SN/A delete osthread; 8870SN/A} 8880SN/A 8890SN/A////////////////////////////////////////////////////////////////////////////// 8900SN/A// thread local storage 8910SN/A 8920SN/Aint os::allocate_thread_local_storage() { 8930SN/A pthread_key_t key; 8940SN/A int rslt = pthread_key_create(&key, NULL); 8950SN/A assert(rslt == 0, "cannot allocate thread local storage"); 8960SN/A return (int)key; 8970SN/A} 8980SN/A 8990SN/A// Note: This is currently not used by VM, as we don't destroy TLS key 9000SN/A// on VM exit. 9010SN/Avoid os::free_thread_local_storage(int index) { 9020SN/A int rslt = pthread_key_delete((pthread_key_t)index); 9030SN/A assert(rslt == 0, "invalid index"); 9040SN/A} 9050SN/A 9060SN/Avoid os::thread_local_storage_at_put(int index, void* value) { 9070SN/A int rslt = pthread_setspecific((pthread_key_t)index, value); 9080SN/A assert(rslt == 0, "pthread_setspecific failed"); 9090SN/A} 9100SN/A 9110SN/Aextern "C" Thread* get_thread() { 9120SN/A return ThreadLocalStorage::thread(); 9130SN/A} 9140SN/A 9150SN/A 9160SN/A//////////////////////////////////////////////////////////////////////////////// 9170SN/A// time support 9180SN/A 9190SN/A// Time since start-up in seconds to a fine granularity. 9200SN/A// Used by VMSelfDestructTimer and the MemProfiler. 9210SN/Adouble os::elapsedTime() { 9220SN/A 9230SN/A return (double)(os::elapsed_counter()) * 0.000001; 9240SN/A} 9250SN/A 9260SN/Ajlong os::elapsed_counter() { 9270SN/A timeval time; 9280SN/A int status = gettimeofday(&time, NULL); 9290SN/A return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 9300SN/A} 9310SN/A 9320SN/Ajlong os::elapsed_frequency() { 9330SN/A return (1000 * 1000); 9340SN/A} 9350SN/A 9360SN/Abool os::supports_vtime() { return true; } 9370SN/Abool os::enable_vtime() { return false; } 9380SN/Abool os::vtime_enabled() { return false; } 9390SN/A 9400SN/Adouble os::elapsedVTime() { 9410SN/A // better than nothing, but not much 9420SN/A return elapsedTime(); 9430SN/A} 9440SN/A 9450SN/Ajlong os::javaTimeMillis() { 9460SN/A timeval time; 9470SN/A int status = gettimeofday(&time, NULL); 9480SN/A assert(status != -1, "bsd error"); 9490SN/A return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 9500SN/A} 9510SN/A 9520SN/A#ifndef CLOCK_MONOTONIC 9530SN/A#define CLOCK_MONOTONIC (1) 9540SN/A#endif 9550SN/A 9560SN/A#ifdef __APPLE__ 9570SN/Avoid os::Bsd::clock_init() { 9580SN/A // XXXDARWIN: Investigate replacement monotonic clock 9590SN/A} 9600SN/A#else 9610SN/Avoid os::Bsd::clock_init() { 9620SN/A struct timespec res; 9630SN/A struct timespec tp; 9640SN/A if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 9650SN/A ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 9660SN/A // yes, monotonic clock is supported 9670SN/A _clock_gettime = ::clock_gettime; 9680SN/A } 9690SN/A} 9700SN/A#endif 9710SN/A 9720SN/A 9730SN/Ajlong os::javaTimeNanos() { 9740SN/A if (Bsd::supports_monotonic_clock()) { 9750SN/A struct timespec tp; 9760SN/A int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 9770SN/A assert(status == 0, "gettime error"); 9780SN/A jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 9790SN/A return result; 9800SN/A } else { 9810SN/A timeval time; 9820SN/A int status = gettimeofday(&time, NULL); 9830SN/A assert(status != -1, "bsd error"); 9840SN/A jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 9850SN/A return 1000 * usecs; 9860SN/A } 9870SN/A} 9880SN/A 9890SN/Avoid os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 9900SN/A if (Bsd::supports_monotonic_clock()) { 9910SN/A info_ptr->max_value = ALL_64_BITS; 9920SN/A 9930SN/A // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 9940SN/A info_ptr->may_skip_backward = false; // not subject to resetting or drifting 9950SN/A info_ptr->may_skip_forward = false; // not subject to resetting or drifting 9960SN/A } else { 9970SN/A // gettimeofday - based on time in seconds since the Epoch thus does not wrap 9980SN/A info_ptr->max_value = ALL_64_BITS; 9990SN/A 10000SN/A // gettimeofday is a real time clock so it skips 10010SN/A info_ptr->may_skip_backward = true; 10020SN/A info_ptr->may_skip_forward = true; 10030SN/A } 10040SN/A 10050SN/A info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 10060SN/A} 10070SN/A 10080SN/A// Return the real, user, and system times in seconds from an 10090SN/A// arbitrary fixed point in the past. 10100SN/Abool os::getTimesSecs(double* process_real_time, 10110SN/A double* process_user_time, 10120SN/A double* process_system_time) { 10130SN/A struct tms ticks; 10140SN/A clock_t real_ticks = times(&ticks); 10150SN/A 10160SN/A if (real_ticks == (clock_t) (-1)) { 10170SN/A return false; 10180SN/A } else { 10190SN/A double ticks_per_second = (double) clock_tics_per_sec; 10200SN/A *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 10210SN/A *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 10220SN/A *process_real_time = ((double) real_ticks) / ticks_per_second; 10230SN/A 10240SN/A return true; 10250SN/A } 10260SN/A} 10270SN/A 10280SN/A 10290SN/Achar * os::local_time_string(char *buf, size_t buflen) { 10300SN/A struct tm t; 10310SN/A time_t long_time; 10320SN/A time(&long_time); 10330SN/A localtime_r(&long_time, &t); 10340SN/A jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 10350SN/A t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 10360SN/A t.tm_hour, t.tm_min, t.tm_sec); 10370SN/A return buf; 10380SN/A} 10390SN/A 10400SN/Astruct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 10410SN/A return localtime_r(clock, res); 10420SN/A} 10430SN/A 10440SN/A//////////////////////////////////////////////////////////////////////////////// 10450SN/A// runtime exit support 10460SN/A 10470SN/A// Note: os::shutdown() might be called very early during initialization, or 10480SN/A// called from signal handler. Before adding something to os::shutdown(), make 10490SN/A// sure it is async-safe and can handle partially initialized VM. 10500SN/Avoid os::shutdown() { 10510SN/A 10520SN/A // allow PerfMemory to attempt cleanup of any persistent resources 10530SN/A perfMemory_exit(); 10540SN/A 10550SN/A // needs to remove object in file system 10560SN/A AttachListener::abort(); 10570SN/A 10580SN/A // flush buffered output, finish log files 10590SN/A ostream_abort(); 10600SN/A 10610SN/A // Check for abort hook 10620SN/A abort_hook_t abort_hook = Arguments::abort_hook(); 10630SN/A if (abort_hook != NULL) { 10640SN/A abort_hook(); 10650SN/A } 10660SN/A 10670SN/A} 10680SN/A 10690SN/A// Note: os::abort() might be called very early during initialization, or 10700SN/A// called from signal handler. Before adding something to os::abort(), make 10710SN/A// sure it is async-safe and can handle partially initialized VM. 10720SN/Avoid os::abort(bool dump_core) { 10730SN/A os::shutdown(); 10740SN/A if (dump_core) { 10750SN/A#ifndef PRODUCT 10760SN/A fdStream out(defaultStream::output_fd()); 10770SN/A out.print_raw("Current thread is "); 10780SN/A char buf[16]; 10790SN/A jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 10800SN/A out.print_raw_cr(buf); 10810SN/A out.print_raw_cr("Dumping core ..."); 10820SN/A#endif 10830SN/A ::abort(); // dump core 1084 } 1085 1086 ::exit(1); 1087} 1088 1089// Die immediately, no exit hook, no abort hook, no cleanup. 1090void os::die() { 1091 // _exit() on BsdThreads only kills current thread 1092 ::abort(); 1093} 1094 1095// unused on bsd for now. 1096void os::set_error_file(const char *logfile) {} 1097 1098 1099// This method is a copy of JDK's sysGetLastErrorString 1100// from src/solaris/hpi/src/system_md.c 1101 1102size_t os::lasterror(char *buf, size_t len) { 1103 1104 if (errno == 0) return 0; 1105 1106 const char *s = ::strerror(errno); 1107 size_t n = ::strlen(s); 1108 if (n >= len) { 1109 n = len - 1; 1110 } 1111 ::strncpy(buf, s, n); 1112 buf[n] = '\0'; 1113 return n; 1114} 1115 1116intx os::current_thread_id() { 1117#ifdef __APPLE__ 1118 return (intx)::mach_thread_self(); 1119#else 1120 return (intx)::pthread_self(); 1121#endif 1122} 1123int os::current_process_id() { 1124 1125 // Under the old bsd thread library, bsd gives each thread 1126 // its own process id. Because of this each thread will return 1127 // a different pid if this method were to return the result 1128 // of getpid(2). Bsd provides no api that returns the pid 1129 // of the launcher thread for the vm. This implementation 1130 // returns a unique pid, the pid of the launcher thread 1131 // that starts the vm 'process'. 1132 1133 // Under the NPTL, getpid() returns the same pid as the 1134 // launcher thread rather than a unique pid per thread. 1135 // Use gettid() if you want the old pre NPTL behaviour. 1136 1137 // if you are looking for the result of a call to getpid() that 1138 // returns a unique pid for the calling thread, then look at the 1139 // OSThread::thread_id() method in osThread_bsd.hpp file 1140 1141 return (int)(_initial_pid ? _initial_pid : getpid()); 1142} 1143 1144// DLL functions 1145 1146#define JNI_LIB_PREFIX "lib" 1147#ifdef __APPLE__ 1148#define JNI_LIB_SUFFIX ".dylib" 1149#else 1150#define JNI_LIB_SUFFIX ".so" 1151#endif 1152 1153const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1154 1155// This must be hard coded because it's the system's temporary 1156// directory not the java application's temp directory, ala java.io.tmpdir. 1157#ifdef __APPLE__ 1158// macosx has a secure per-user temporary directory 1159char temp_path_storage[PATH_MAX]; 1160const char* os::get_temp_directory() { 1161 static char *temp_path = NULL; 1162 if (temp_path == NULL) { 1163 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1164 if (pathSize == 0 || pathSize > PATH_MAX) { 1165 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1166 } 1167 temp_path = temp_path_storage; 1168 } 1169 return temp_path; 1170} 1171#else /* __APPLE__ */ 1172const char* os::get_temp_directory() { return "/tmp"; } 1173#endif /* __APPLE__ */ 1174 1175static bool file_exists(const char* filename) { 1176 struct stat statbuf; 1177 if (filename == NULL || strlen(filename) == 0) { 1178 return false; 1179 } 1180 return os::stat(filename, &statbuf) == 0; 1181} 1182 1183bool os::dll_build_name(char* buffer, size_t buflen, 1184 const char* pname, const char* fname) { 1185 bool retval = false; 1186 // Copied from libhpi 1187 const size_t pnamelen = pname ? strlen(pname) : 0; 1188 1189 // Return error on buffer overflow. 1190 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1191 return retval; 1192 } 1193 1194 if (pnamelen == 0) { 1195 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1196 retval = true; 1197 } else if (strchr(pname, *os::path_separator()) != NULL) { 1198 int n; 1199 char** pelements = split_path(pname, &n); 1200 if (pelements == NULL) { 1201 return false; 1202 } 1203 for (int i = 0 ; i < n ; i++) { 1204 // Really shouldn't be NULL, but check can't hurt 1205 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1206 continue; // skip the empty path values 1207 } 1208 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1209 pelements[i], fname); 1210 if (file_exists(buffer)) { 1211 retval = true; 1212 break; 1213 } 1214 } 1215 // release the storage 1216 for (int i = 0 ; i < n ; i++) { 1217 if (pelements[i] != NULL) { 1218 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1219 } 1220 } 1221 if (pelements != NULL) { 1222 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1223 } 1224 } else { 1225 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1226 retval = true; 1227 } 1228 return retval; 1229} 1230 1231// check if addr is inside libjvm.so 1232bool os::address_is_in_vm(address addr) { 1233 static address libjvm_base_addr; 1234 Dl_info dlinfo; 1235 1236 if (libjvm_base_addr == NULL) { 1237 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1238 libjvm_base_addr = (address)dlinfo.dli_fbase; 1239 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1240 } 1241 1242 if (dladdr((void *)addr, &dlinfo)) { 1243 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1244 } 1245 1246 return false; 1247} 1248 1249 1250#define MACH_MAXSYMLEN 256 1251 1252bool os::dll_address_to_function_name(address addr, char *buf, 1253 int buflen, int *offset) { 1254 Dl_info dlinfo; 1255 char localbuf[MACH_MAXSYMLEN]; 1256 1257 // dladdr will find names of dynamic functions only, but does 1258 // it set dli_fbase with mach_header address when it "fails" ? 1259 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { 1260 if (buf != NULL) { 1261 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1262 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1263 } 1264 } 1265 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1266 return true; 1267 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1269 buf, buflen, offset, dlinfo.dli_fname)) { 1270 return true; 1271 } 1272 } 1273 1274 // Handle non-dymanic manually: 1275 if (dlinfo.dli_fbase != NULL && 1276 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { 1277 if(!Decoder::demangle(localbuf, buf, buflen)) { 1278 jio_snprintf(buf, buflen, "%s", localbuf); 1279 } 1280 return true; 1281 } 1282 if (buf != NULL) buf[0] = '\0'; 1283 if (offset != NULL) *offset = -1; 1284 return false; 1285} 1286 1287// ported from solaris version 1288bool os::dll_address_to_library_name(address addr, char* buf, 1289 int buflen, int* offset) { 1290 Dl_info dlinfo; 1291 1292 if (dladdr((void*)addr, &dlinfo)){ 1293 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1294 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1295 return true; 1296 } else { 1297 if (buf) buf[0] = '\0'; 1298 if (offset) *offset = -1; 1299 return false; 1300 } 1301} 1302 1303// Loads .dll/.so and 1304// in case of error it checks if .dll/.so was built for the 1305// same architecture as Hotspot is running on 1306 1307#ifdef __APPLE__ 1308void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1309 void * result= ::dlopen(filename, RTLD_LAZY); 1310 if (result != NULL) { 1311 // Successful loading 1312 return result; 1313 } 1314 1315 // Read system error message into ebuf 1316 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1317 ebuf[ebuflen-1]='\0'; 1318 1319 return NULL; 1320} 1321#else 1322void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1323{ 1324 void * result= ::dlopen(filename, RTLD_LAZY); 1325 if (result != NULL) { 1326 // Successful loading 1327 return result; 1328 } 1329 1330 Elf32_Ehdr elf_head; 1331 1332 // Read system error message into ebuf 1333 // It may or may not be overwritten below 1334 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1335 ebuf[ebuflen-1]='\0'; 1336 int diag_msg_max_length=ebuflen-strlen(ebuf); 1337 char* diag_msg_buf=ebuf+strlen(ebuf); 1338 1339 if (diag_msg_max_length==0) { 1340 // No more space in ebuf for additional diagnostics message 1341 return NULL; 1342 } 1343 1344 1345 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1346 1347 if (file_descriptor < 0) { 1348 // Can't open library, report dlerror() message 1349 return NULL; 1350 } 1351 1352 bool failed_to_read_elf_head= 1353 (sizeof(elf_head)!= 1354 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1355 1356 ::close(file_descriptor); 1357 if (failed_to_read_elf_head) { 1358 // file i/o error - report dlerror() msg 1359 return NULL; 1360 } 1361 1362 typedef struct { 1363 Elf32_Half code; // Actual value as defined in elf.h 1364 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1365 char elf_class; // 32 or 64 bit 1366 char endianess; // MSB or LSB 1367 char* name; // String representation 1368 } arch_t; 1369 1370 #ifndef EM_486 1371 #define EM_486 6 /* Intel 80486 */ 1372 #endif 1373 1374 #ifndef EM_MIPS_RS3_LE 1375 #define EM_MIPS_RS3_LE 10 /* MIPS */ 1376 #endif 1377 1378 #ifndef EM_PPC64 1379 #define EM_PPC64 21 /* PowerPC64 */ 1380 #endif 1381 1382 #ifndef EM_S390 1383 #define EM_S390 22 /* IBM System/390 */ 1384 #endif 1385 1386 #ifndef EM_IA_64 1387 #define EM_IA_64 50 /* HP/Intel IA-64 */ 1388 #endif 1389 1390 #ifndef EM_X86_64 1391 #define EM_X86_64 62 /* AMD x86-64 */ 1392 #endif 1393 1394 static const arch_t arch_array[]={ 1395 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1396 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1397 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1398 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1399 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1400 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1401 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1402 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1403 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1404 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1405 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1406 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1407 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1408 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1409 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1410 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1411 }; 1412 1413 #if (defined IA32) 1414 static Elf32_Half running_arch_code=EM_386; 1415 #elif (defined AMD64) 1416 static Elf32_Half running_arch_code=EM_X86_64; 1417 #elif (defined IA64) 1418 static Elf32_Half running_arch_code=EM_IA_64; 1419 #elif (defined __sparc) && (defined _LP64) 1420 static Elf32_Half running_arch_code=EM_SPARCV9; 1421 #elif (defined __sparc) && (!defined _LP64) 1422 static Elf32_Half running_arch_code=EM_SPARC; 1423 #elif (defined __powerpc64__) 1424 static Elf32_Half running_arch_code=EM_PPC64; 1425 #elif (defined __powerpc__) 1426 static Elf32_Half running_arch_code=EM_PPC; 1427 #elif (defined ARM) 1428 static Elf32_Half running_arch_code=EM_ARM; 1429 #elif (defined S390) 1430 static Elf32_Half running_arch_code=EM_S390; 1431 #elif (defined ALPHA) 1432 static Elf32_Half running_arch_code=EM_ALPHA; 1433 #elif (defined MIPSEL) 1434 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1435 #elif (defined PARISC) 1436 static Elf32_Half running_arch_code=EM_PARISC; 1437 #elif (defined MIPS) 1438 static Elf32_Half running_arch_code=EM_MIPS; 1439 #elif (defined M68K) 1440 static Elf32_Half running_arch_code=EM_68K; 1441 #else 1442 #error Method os::dll_load requires that one of following is defined:\ 1443 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1444 #endif 1445 1446 // Identify compatability class for VM's architecture and library's architecture 1447 // Obtain string descriptions for architectures 1448 1449 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1450 int running_arch_index=-1; 1451 1452 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1453 if (running_arch_code == arch_array[i].code) { 1454 running_arch_index = i; 1455 } 1456 if (lib_arch.code == arch_array[i].code) { 1457 lib_arch.compat_class = arch_array[i].compat_class; 1458 lib_arch.name = arch_array[i].name; 1459 } 1460 } 1461 1462 assert(running_arch_index != -1, 1463 "Didn't find running architecture code (running_arch_code) in arch_array"); 1464 if (running_arch_index == -1) { 1465 // Even though running architecture detection failed 1466 // we may still continue with reporting dlerror() message 1467 return NULL; 1468 } 1469 1470 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1471 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1472 return NULL; 1473 } 1474 1475#ifndef S390 1476 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1477 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1478 return NULL; 1479 } 1480#endif // !S390 1481 1482 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1483 if ( lib_arch.name!=NULL ) { 1484 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1485 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1486 lib_arch.name, arch_array[running_arch_index].name); 1487 } else { 1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1489 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1490 lib_arch.code, 1491 arch_array[running_arch_index].name); 1492 } 1493 } 1494 1495 return NULL; 1496} 1497#endif /* !__APPLE__ */ 1498 1499// XXX: Do we need a lock around this as per Linux? 1500void* os::dll_lookup(void* handle, const char* name) { 1501 return dlsym(handle, name); 1502} 1503 1504 1505static bool _print_ascii_file(const char* filename, outputStream* st) { 1506 int fd = ::open(filename, O_RDONLY); 1507 if (fd == -1) { 1508 return false; 1509 } 1510 1511 char buf[32]; 1512 int bytes; 1513 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1514 st->print_raw(buf, bytes); 1515 } 1516 1517 ::close(fd); 1518 1519 return true; 1520} 1521 1522void os::print_dll_info(outputStream *st) { 1523 st->print_cr("Dynamic libraries:"); 1524#ifdef RTLD_DI_LINKMAP 1525 Dl_info dli; 1526 void *handle; 1527 Link_map *map; 1528 Link_map *p; 1529 1530 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1531 st->print_cr("Error: Cannot print dynamic libraries."); 1532 return; 1533 } 1534 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1535 if (handle == NULL) { 1536 st->print_cr("Error: Cannot print dynamic libraries."); 1537 return; 1538 } 1539 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1540 if (map == NULL) { 1541 st->print_cr("Error: Cannot print dynamic libraries."); 1542 return; 1543 } 1544 1545 while (map->l_prev != NULL) 1546 map = map->l_prev; 1547 1548 while (map != NULL) { 1549 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1550 map = map->l_next; 1551 } 1552 1553 dlclose(handle); 1554#elif defined(__APPLE__) 1555 uint32_t count; 1556 uint32_t i; 1557 1558 count = _dyld_image_count(); 1559 for (i = 1; i < count; i++) { 1560 const char *name = _dyld_get_image_name(i); 1561 intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1562 st->print_cr(PTR_FORMAT " \t%s", slide, name); 1563 } 1564#else 1565 st->print_cr("Error: Cannot print dynamic libraries."); 1566#endif 1567} 1568 1569void os::print_os_info_brief(outputStream* st) { 1570 st->print("Bsd"); 1571 1572 os::Posix::print_uname_info(st); 1573} 1574 1575void os::print_os_info(outputStream* st) { 1576 st->print("OS:"); 1577 st->print("Bsd"); 1578 1579 os::Posix::print_uname_info(st); 1580 1581 os::Posix::print_rlimit_info(st); 1582 1583 os::Posix::print_load_average(st); 1584} 1585 1586void os::pd_print_cpu_info(outputStream* st) { 1587 // Nothing to do for now. 1588} 1589 1590void os::print_memory_info(outputStream* st) { 1591 1592 st->print("Memory:"); 1593 st->print(" %dk page", os::vm_page_size()>>10); 1594 1595 st->print(", physical " UINT64_FORMAT "k", 1596 os::physical_memory() >> 10); 1597 st->print("(" UINT64_FORMAT "k free)", 1598 os::available_memory() >> 10); 1599 st->cr(); 1600 1601 // meminfo 1602 st->print("\n/proc/meminfo:\n"); 1603 _print_ascii_file("/proc/meminfo", st); 1604 st->cr(); 1605} 1606 1607// Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1608// but they're the same for all the bsd arch that we support 1609// and they're the same for solaris but there's no common place to put this. 1610const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1611 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1612 "ILL_COPROC", "ILL_BADSTK" }; 1613 1614const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1615 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1616 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1617 1618const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1619 1620const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1621 1622void os::print_siginfo(outputStream* st, void* siginfo) { 1623 st->print("siginfo:"); 1624 1625 const int buflen = 100; 1626 char buf[buflen]; 1627 siginfo_t *si = (siginfo_t*)siginfo; 1628 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1629 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1630 st->print("si_errno=%s", buf); 1631 } else { 1632 st->print("si_errno=%d", si->si_errno); 1633 } 1634 const int c = si->si_code; 1635 assert(c > 0, "unexpected si_code"); 1636 switch (si->si_signo) { 1637 case SIGILL: 1638 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1639 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1640 break; 1641 case SIGFPE: 1642 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1643 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1644 break; 1645 case SIGSEGV: 1646 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1647 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1648 break; 1649 case SIGBUS: 1650 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1651 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1652 break; 1653 default: 1654 st->print(", si_code=%d", si->si_code); 1655 // no si_addr 1656 } 1657 1658 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1659 UseSharedSpaces) { 1660 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1661 if (mapinfo->is_in_shared_space(si->si_addr)) { 1662 st->print("\n\nError accessing class data sharing archive." \ 1663 " Mapped file inaccessible during execution, " \ 1664 " possible disk/network problem."); 1665 } 1666 } 1667 st->cr(); 1668} 1669 1670 1671static void print_signal_handler(outputStream* st, int sig, 1672 char* buf, size_t buflen); 1673 1674void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1675 st->print_cr("Signal Handlers:"); 1676 print_signal_handler(st, SIGSEGV, buf, buflen); 1677 print_signal_handler(st, SIGBUS , buf, buflen); 1678 print_signal_handler(st, SIGFPE , buf, buflen); 1679 print_signal_handler(st, SIGPIPE, buf, buflen); 1680 print_signal_handler(st, SIGXFSZ, buf, buflen); 1681 print_signal_handler(st, SIGILL , buf, buflen); 1682 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1683 print_signal_handler(st, SR_signum, buf, buflen); 1684 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1685 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1686 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1687 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1688} 1689 1690static char saved_jvm_path[MAXPATHLEN] = {0}; 1691 1692// Find the full path to the current module, libjvm 1693void os::jvm_path(char *buf, jint buflen) { 1694 // Error checking. 1695 if (buflen < MAXPATHLEN) { 1696 assert(false, "must use a large-enough buffer"); 1697 buf[0] = '\0'; 1698 return; 1699 } 1700 // Lazy resolve the path to current module. 1701 if (saved_jvm_path[0] != 0) { 1702 strcpy(buf, saved_jvm_path); 1703 return; 1704 } 1705 1706 char dli_fname[MAXPATHLEN]; 1707 bool ret = dll_address_to_library_name( 1708 CAST_FROM_FN_PTR(address, os::jvm_path), 1709 dli_fname, sizeof(dli_fname), NULL); 1710 assert(ret != 0, "cannot locate libjvm"); 1711 char *rp = realpath(dli_fname, buf); 1712 if (rp == NULL) 1713 return; 1714 1715 if (Arguments::created_by_gamma_launcher()) { 1716 // Support for the gamma launcher. Typical value for buf is 1717 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1718 // the right place in the string, then assume we are installed in a JDK and 1719 // we're done. Otherwise, check for a JAVA_HOME environment variable and 1720 // construct a path to the JVM being overridden. 1721 1722 const char *p = buf + strlen(buf) - 1; 1723 for (int count = 0; p > buf && count < 5; ++count) { 1724 for (--p; p > buf && *p != '/'; --p) 1725 /* empty */ ; 1726 } 1727 1728 if (strncmp(p, "/jre/lib/", 9) != 0) { 1729 // Look for JAVA_HOME in the environment. 1730 char* java_home_var = ::getenv("JAVA_HOME"); 1731 if (java_home_var != NULL && java_home_var[0] != 0) { 1732 char* jrelib_p; 1733 int len; 1734 1735 // Check the current module name "libjvm" 1736 p = strrchr(buf, '/'); 1737 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1738 1739 rp = realpath(java_home_var, buf); 1740 if (rp == NULL) 1741 return; 1742 1743 // determine if this is a legacy image or modules image 1744 // modules image doesn't have "jre" subdirectory 1745 len = strlen(buf); 1746 jrelib_p = buf + len; 1747 1748 // Add the appropriate library subdir 1749 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1750 if (0 != access(buf, F_OK)) { 1751 snprintf(jrelib_p, buflen-len, "/lib"); 1752 } 1753 1754 // Add the appropriate client or server subdir 1755 len = strlen(buf); 1756 jrelib_p = buf + len; 1757 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1758 if (0 != access(buf, F_OK)) { 1759 snprintf(jrelib_p, buflen-len, ""); 1760 } 1761 1762 // If the path exists within JAVA_HOME, add the JVM library name 1763 // to complete the path to JVM being overridden. Otherwise fallback 1764 // to the path to the current library. 1765 if (0 == access(buf, F_OK)) { 1766 // Use current module name "libjvm" 1767 len = strlen(buf); 1768 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1769 } else { 1770 // Fall back to path of current library 1771 rp = realpath(dli_fname, buf); 1772 if (rp == NULL) 1773 return; 1774 } 1775 } 1776 } 1777 } 1778 1779 strcpy(saved_jvm_path, buf); 1780} 1781 1782void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1783 // no prefix required, not even "_" 1784} 1785 1786void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1787 // no suffix required 1788} 1789 1790//////////////////////////////////////////////////////////////////////////////// 1791// sun.misc.Signal support 1792 1793static volatile jint sigint_count = 0; 1794 1795static void 1796UserHandler(int sig, void *siginfo, void *context) { 1797 // 4511530 - sem_post is serialized and handled by the manager thread. When 1798 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1799 // don't want to flood the manager thread with sem_post requests. 1800 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1801 return; 1802 1803 // Ctrl-C is pressed during error reporting, likely because the error 1804 // handler fails to abort. Let VM die immediately. 1805 if (sig == SIGINT && is_error_reported()) { 1806 os::die(); 1807 } 1808 1809 os::signal_notify(sig); 1810} 1811 1812void* os::user_handler() { 1813 return CAST_FROM_FN_PTR(void*, UserHandler); 1814} 1815 1816extern "C" { 1817 typedef void (*sa_handler_t)(int); 1818 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1819} 1820 1821void* os::signal(int signal_number, void* handler) { 1822 struct sigaction sigAct, oldSigAct; 1823 1824 sigfillset(&(sigAct.sa_mask)); 1825 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1826 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1827 1828 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1829 // -1 means registration failed 1830 return (void *)-1; 1831 } 1832 1833 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1834} 1835 1836void os::signal_raise(int signal_number) { 1837 ::raise(signal_number); 1838} 1839 1840/* 1841 * The following code is moved from os.cpp for making this 1842 * code platform specific, which it is by its very nature. 1843 */ 1844 1845// Will be modified when max signal is changed to be dynamic 1846int os::sigexitnum_pd() { 1847 return NSIG; 1848} 1849 1850// a counter for each possible signal value 1851static volatile jint pending_signals[NSIG+1] = { 0 }; 1852 1853// Bsd(POSIX) specific hand shaking semaphore. 1854#ifdef __APPLE__ 1855typedef semaphore_t os_semaphore_t; 1856#define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1857#define SEM_WAIT(sem) semaphore_wait(sem) 1858#define SEM_POST(sem) semaphore_signal(sem) 1859#define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1860#else 1861typedef sem_t os_semaphore_t; 1862#define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1863#define SEM_WAIT(sem) sem_wait(&sem) 1864#define SEM_POST(sem) sem_post(&sem) 1865#define SEM_DESTROY(sem) sem_destroy(&sem) 1866#endif 1867 1868class Semaphore : public StackObj { 1869 public: 1870 Semaphore(); 1871 ~Semaphore(); 1872 void signal(); 1873 void wait(); 1874 bool trywait(); 1875 bool timedwait(unsigned int sec, int nsec); 1876 private: 1877 jlong currenttime() const; 1878 semaphore_t _semaphore; 1879}; 1880 1881Semaphore::Semaphore() : _semaphore(0) { 1882 SEM_INIT(_semaphore, 0); 1883} 1884 1885Semaphore::~Semaphore() { 1886 SEM_DESTROY(_semaphore); 1887} 1888 1889void Semaphore::signal() { 1890 SEM_POST(_semaphore); 1891} 1892 1893void Semaphore::wait() { 1894 SEM_WAIT(_semaphore); 1895} 1896 1897jlong Semaphore::currenttime() const { 1898 struct timeval tv; 1899 gettimeofday(&tv, NULL); 1900 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1901} 1902 1903#ifdef __APPLE__ 1904bool Semaphore::trywait() { 1905 return timedwait(0, 0); 1906} 1907 1908bool Semaphore::timedwait(unsigned int sec, int nsec) { 1909 kern_return_t kr = KERN_ABORTED; 1910 mach_timespec_t waitspec; 1911 waitspec.tv_sec = sec; 1912 waitspec.tv_nsec = nsec; 1913 1914 jlong starttime = currenttime(); 1915 1916 kr = semaphore_timedwait(_semaphore, waitspec); 1917 while (kr == KERN_ABORTED) { 1918 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1919 1920 jlong current = currenttime(); 1921 jlong passedtime = current - starttime; 1922 1923 if (passedtime >= totalwait) { 1924 waitspec.tv_sec = 0; 1925 waitspec.tv_nsec = 0; 1926 } else { 1927 jlong waittime = totalwait - (current - starttime); 1928 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1929 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1930 } 1931 1932 kr = semaphore_timedwait(_semaphore, waitspec); 1933 } 1934 1935 return kr == KERN_SUCCESS; 1936} 1937 1938#else 1939 1940bool Semaphore::trywait() { 1941 return sem_trywait(&_semaphore) == 0; 1942} 1943 1944bool Semaphore::timedwait(unsigned int sec, int nsec) { 1945 struct timespec ts; 1946 jlong endtime = unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 1947 1948 while (1) { 1949 int result = sem_timedwait(&_semaphore, &ts); 1950 if (result == 0) { 1951 return true; 1952 } else if (errno == EINTR) { 1953 continue; 1954 } else if (errno == ETIMEDOUT) { 1955 return false; 1956 } else { 1957 return false; 1958 } 1959 } 1960} 1961 1962#endif // __APPLE__ 1963 1964static os_semaphore_t sig_sem; 1965static Semaphore sr_semaphore; 1966 1967void os::signal_init_pd() { 1968 // Initialize signal structures 1969 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1970 1971 // Initialize signal semaphore 1972 ::SEM_INIT(sig_sem, 0); 1973} 1974 1975void os::signal_notify(int sig) { 1976 Atomic::inc(&pending_signals[sig]); 1977 ::SEM_POST(sig_sem); 1978} 1979 1980static int check_pending_signals(bool wait) { 1981 Atomic::store(0, &sigint_count); 1982 for (;;) { 1983 for (int i = 0; i < NSIG + 1; i++) { 1984 jint n = pending_signals[i]; 1985 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1986 return i; 1987 } 1988 } 1989 if (!wait) { 1990 return -1; 1991 } 1992 JavaThread *thread = JavaThread::current(); 1993 ThreadBlockInVM tbivm(thread); 1994 1995 bool threadIsSuspended; 1996 do { 1997 thread->set_suspend_equivalent(); 1998 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1999 ::SEM_WAIT(sig_sem); 2000 2001 // were we externally suspended while we were waiting? 2002 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2003 if (threadIsSuspended) { 2004 // 2005 // The semaphore has been incremented, but while we were waiting 2006 // another thread suspended us. We don't want to continue running 2007 // while suspended because that would surprise the thread that 2008 // suspended us. 2009 // 2010 ::SEM_POST(sig_sem); 2011 2012 thread->java_suspend_self(); 2013 } 2014 } while (threadIsSuspended); 2015 } 2016} 2017 2018int os::signal_lookup() { 2019 return check_pending_signals(false); 2020} 2021 2022int os::signal_wait() { 2023 return check_pending_signals(true); 2024} 2025 2026//////////////////////////////////////////////////////////////////////////////// 2027// Virtual Memory 2028 2029int os::vm_page_size() { 2030 // Seems redundant as all get out 2031 assert(os::Bsd::page_size() != -1, "must call os::init"); 2032 return os::Bsd::page_size(); 2033} 2034 2035// Solaris allocates memory by pages. 2036int os::vm_allocation_granularity() { 2037 assert(os::Bsd::page_size() != -1, "must call os::init"); 2038 return os::Bsd::page_size(); 2039} 2040 2041// Rationale behind this function: 2042// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2043// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2044// samples for JITted code. Here we create private executable mapping over the code cache 2045// and then we can use standard (well, almost, as mapping can change) way to provide 2046// info for the reporting script by storing timestamp and location of symbol 2047void bsd_wrap_code(char* base, size_t size) { 2048 static volatile jint cnt = 0; 2049 2050 if (!UseOprofile) { 2051 return; 2052 } 2053 2054 char buf[PATH_MAX + 1]; 2055 int num = Atomic::add(1, &cnt); 2056 2057 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2058 os::get_temp_directory(), os::current_process_id(), num); 2059 unlink(buf); 2060 2061 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2062 2063 if (fd != -1) { 2064 off_t rv = ::lseek(fd, size-2, SEEK_SET); 2065 if (rv != (off_t)-1) { 2066 if (::write(fd, "", 1) == 1) { 2067 mmap(base, size, 2068 PROT_READ|PROT_WRITE|PROT_EXEC, 2069 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2070 } 2071 } 2072 ::close(fd); 2073 unlink(buf); 2074 } 2075} 2076 2077static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2078 int err) { 2079 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2080 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2081 strerror(err), err); 2082} 2083 2084// NOTE: Bsd kernel does not really reserve the pages for us. 2085// All it does is to check if there are enough free pages 2086// left at the time of mmap(). This could be a potential 2087// problem. 2088bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2089 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2090#ifdef __OpenBSD__ 2091 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2092 if (::mprotect(addr, size, prot) == 0) { 2093 return true; 2094 } 2095#else 2096 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2097 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2098 if (res != (uintptr_t) MAP_FAILED) { 2099 return true; 2100 } 2101#endif 2102 2103 // Warn about any commit errors we see in non-product builds just 2104 // in case mmap() doesn't work as described on the man page. 2105 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2106 2107 return false; 2108} 2109 2110bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2111 bool exec) { 2112 // alignment_hint is ignored on this OS 2113 return pd_commit_memory(addr, size, exec); 2114} 2115 2116void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2117 const char* mesg) { 2118 assert(mesg != NULL, "mesg must be specified"); 2119 if (!pd_commit_memory(addr, size, exec)) { 2120 // add extra info in product mode for vm_exit_out_of_memory(): 2121 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2122 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 2123 } 2124} 2125 2126void os::pd_commit_memory_or_exit(char* addr, size_t size, 2127 size_t alignment_hint, bool exec, 2128 const char* mesg) { 2129 // alignment_hint is ignored on this OS 2130 pd_commit_memory_or_exit(addr, size, exec, mesg); 2131} 2132 2133void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2134} 2135 2136void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2137 ::madvise(addr, bytes, MADV_DONTNEED); 2138} 2139 2140void os::numa_make_global(char *addr, size_t bytes) { 2141} 2142 2143void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2144} 2145 2146bool os::numa_topology_changed() { return false; } 2147 2148size_t os::numa_get_groups_num() { 2149 return 1; 2150} 2151 2152int os::numa_get_group_id() { 2153 return 0; 2154} 2155 2156size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2157 if (size > 0) { 2158 ids[0] = 0; 2159 return 1; 2160 } 2161 return 0; 2162} 2163 2164bool os::get_page_info(char *start, page_info* info) { 2165 return false; 2166} 2167 2168char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2169 return end; 2170} 2171 2172 2173bool os::pd_uncommit_memory(char* addr, size_t size) { 2174#ifdef __OpenBSD__ 2175 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2176 return ::mprotect(addr, size, PROT_NONE) == 0; 2177#else 2178 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2179 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2180 return res != (uintptr_t) MAP_FAILED; 2181#endif 2182} 2183 2184bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2185 return os::commit_memory(addr, size, !ExecMem); 2186} 2187 2188// If this is a growable mapping, remove the guard pages entirely by 2189// munmap()ping them. If not, just call uncommit_memory(). 2190bool os::remove_stack_guard_pages(char* addr, size_t size) { 2191 return os::uncommit_memory(addr, size); 2192} 2193 2194static address _highest_vm_reserved_address = NULL; 2195 2196// If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2197// at 'requested_addr'. If there are existing memory mappings at the same 2198// location, however, they will be overwritten. If 'fixed' is false, 2199// 'requested_addr' is only treated as a hint, the return value may or 2200// may not start from the requested address. Unlike Bsd mmap(), this 2201// function returns NULL to indicate failure. 2202static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2203 char * addr; 2204 int flags; 2205 2206 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2207 if (fixed) { 2208 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2209 flags |= MAP_FIXED; 2210 } 2211 2212 // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2213 // touch an uncommitted page. Otherwise, the read/write might 2214 // succeed if we have enough swap space to back the physical page. 2215 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2216 flags, -1, 0); 2217 2218 if (addr != MAP_FAILED) { 2219 // anon_mmap() should only get called during VM initialization, 2220 // don't need lock (actually we can skip locking even it can be called 2221 // from multiple threads, because _highest_vm_reserved_address is just a 2222 // hint about the upper limit of non-stack memory regions.) 2223 if ((address)addr + bytes > _highest_vm_reserved_address) { 2224 _highest_vm_reserved_address = (address)addr + bytes; 2225 } 2226 } 2227 2228 return addr == MAP_FAILED ? NULL : addr; 2229} 2230 2231// Don't update _highest_vm_reserved_address, because there might be memory 2232// regions above addr + size. If so, releasing a memory region only creates 2233// a hole in the address space, it doesn't help prevent heap-stack collision. 2234// 2235static int anon_munmap(char * addr, size_t size) { 2236 return ::munmap(addr, size) == 0; 2237} 2238 2239char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2240 size_t alignment_hint) { 2241 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2242} 2243 2244bool os::pd_release_memory(char* addr, size_t size) { 2245 return anon_munmap(addr, size); 2246} 2247 2248static bool bsd_mprotect(char* addr, size_t size, int prot) { 2249 // Bsd wants the mprotect address argument to be page aligned. 2250 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2251 2252 // According to SUSv3, mprotect() should only be used with mappings 2253 // established by mmap(), and mmap() always maps whole pages. Unaligned 2254 // 'addr' likely indicates problem in the VM (e.g. trying to change 2255 // protection of malloc'ed or statically allocated memory). Check the 2256 // caller if you hit this assert. 2257 assert(addr == bottom, "sanity check"); 2258 2259 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2260 return ::mprotect(bottom, size, prot) == 0; 2261} 2262 2263// Set protections specified 2264bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2265 bool is_committed) { 2266 unsigned int p = 0; 2267 switch (prot) { 2268 case MEM_PROT_NONE: p = PROT_NONE; break; 2269 case MEM_PROT_READ: p = PROT_READ; break; 2270 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2271 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2272 default: 2273 ShouldNotReachHere(); 2274 } 2275 // is_committed is unused. 2276 return bsd_mprotect(addr, bytes, p); 2277} 2278 2279bool os::guard_memory(char* addr, size_t size) { 2280 return bsd_mprotect(addr, size, PROT_NONE); 2281} 2282 2283bool os::unguard_memory(char* addr, size_t size) { 2284 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2285} 2286 2287bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2288 return false; 2289} 2290 2291// Large page support 2292 2293static size_t _large_page_size = 0; 2294 2295void os::large_page_init() { 2296} 2297 2298 2299char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { 2300 // "exec" is passed in but not used. Creating the shared image for 2301 // the code cache doesn't have an SHM_X executable permission to check. 2302 assert(UseLargePages && UseSHM, "only for SHM large pages"); 2303 2304 key_t key = IPC_PRIVATE; 2305 char *addr; 2306 2307 bool warn_on_failure = UseLargePages && 2308 (!FLAG_IS_DEFAULT(UseLargePages) || 2309 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2310 ); 2311 char msg[128]; 2312 2313 // Create a large shared memory region to attach to based on size. 2314 // Currently, size is the total size of the heap 2315 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2316 if (shmid == -1) { 2317 // Possible reasons for shmget failure: 2318 // 1. shmmax is too small for Java heap. 2319 // > check shmmax value: cat /proc/sys/kernel/shmmax 2320 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2321 // 2. not enough large page memory. 2322 // > check available large pages: cat /proc/meminfo 2323 // > increase amount of large pages: 2324 // echo new_value > /proc/sys/vm/nr_hugepages 2325 // Note 1: different Bsd may use different name for this property, 2326 // e.g. on Redhat AS-3 it is "hugetlb_pool". 2327 // Note 2: it's possible there's enough physical memory available but 2328 // they are so fragmented after a long run that they can't 2329 // coalesce into large pages. Try to reserve large pages when 2330 // the system is still "fresh". 2331 if (warn_on_failure) { 2332 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2333 warning(msg); 2334 } 2335 return NULL; 2336 } 2337 2338 // attach to the region 2339 addr = (char*)shmat(shmid, req_addr, 0); 2340 int err = errno; 2341 2342 // Remove shmid. If shmat() is successful, the actual shared memory segment 2343 // will be deleted when it's detached by shmdt() or when the process 2344 // terminates. If shmat() is not successful this will remove the shared 2345 // segment immediately. 2346 shmctl(shmid, IPC_RMID, NULL); 2347 2348 if ((intptr_t)addr == -1) { 2349 if (warn_on_failure) { 2350 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2351 warning(msg); 2352 } 2353 return NULL; 2354 } 2355 2356 // The memory is committed 2357 address pc = CALLER_PC; 2358 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); 2359 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); 2360 2361 return addr; 2362} 2363 2364bool os::release_memory_special(char* base, size_t bytes) { 2365 // detaching the SHM segment will also delete it, see reserve_memory_special() 2366 int rslt = shmdt(base); 2367 if (rslt == 0) { 2368 MemTracker::record_virtual_memory_uncommit((address)base, bytes); 2369 MemTracker::record_virtual_memory_release((address)base, bytes); 2370 return true; 2371 } else { 2372 return false; 2373 } 2374 2375} 2376 2377size_t os::large_page_size() { 2378 return _large_page_size; 2379} 2380 2381// HugeTLBFS allows application to commit large page memory on demand; 2382// with SysV SHM the entire memory region must be allocated as shared 2383// memory. 2384bool os::can_commit_large_page_memory() { 2385 return UseHugeTLBFS; 2386} 2387 2388bool os::can_execute_large_page_memory() { 2389 return UseHugeTLBFS; 2390} 2391 2392// Reserve memory at an arbitrary address, only if that area is 2393// available (and not reserved for something else). 2394 2395char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2396 const int max_tries = 10; 2397 char* base[max_tries]; 2398 size_t size[max_tries]; 2399 const size_t gap = 0x000000; 2400 2401 // Assert only that the size is a multiple of the page size, since 2402 // that's all that mmap requires, and since that's all we really know 2403 // about at this low abstraction level. If we need higher alignment, 2404 // we can either pass an alignment to this method or verify alignment 2405 // in one of the methods further up the call chain. See bug 5044738. 2406 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2407 2408 // Repeatedly allocate blocks until the block is allocated at the 2409 // right spot. Give up after max_tries. Note that reserve_memory() will 2410 // automatically update _highest_vm_reserved_address if the call is 2411 // successful. The variable tracks the highest memory address every reserved 2412 // by JVM. It is used to detect heap-stack collision if running with 2413 // fixed-stack BsdThreads. Because here we may attempt to reserve more 2414 // space than needed, it could confuse the collision detecting code. To 2415 // solve the problem, save current _highest_vm_reserved_address and 2416 // calculate the correct value before return. 2417 address old_highest = _highest_vm_reserved_address; 2418 2419 // Bsd mmap allows caller to pass an address as hint; give it a try first, 2420 // if kernel honors the hint then we can return immediately. 2421 char * addr = anon_mmap(requested_addr, bytes, false); 2422 if (addr == requested_addr) { 2423 return requested_addr; 2424 } 2425 2426 if (addr != NULL) { 2427 // mmap() is successful but it fails to reserve at the requested address 2428 anon_munmap(addr, bytes); 2429 } 2430 2431 int i; 2432 for (i = 0; i < max_tries; ++i) { 2433 base[i] = reserve_memory(bytes); 2434 2435 if (base[i] != NULL) { 2436 // Is this the block we wanted? 2437 if (base[i] == requested_addr) { 2438 size[i] = bytes; 2439 break; 2440 } 2441 2442 // Does this overlap the block we wanted? Give back the overlapped 2443 // parts and try again. 2444 2445 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2446 if (top_overlap >= 0 && top_overlap < bytes) { 2447 unmap_memory(base[i], top_overlap); 2448 base[i] += top_overlap; 2449 size[i] = bytes - top_overlap; 2450 } else { 2451 size_t bottom_overlap = base[i] + bytes - requested_addr; 2452 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2453 unmap_memory(requested_addr, bottom_overlap); 2454 size[i] = bytes - bottom_overlap; 2455 } else { 2456 size[i] = bytes; 2457 } 2458 } 2459 } 2460 } 2461 2462 // Give back the unused reserved pieces. 2463 2464 for (int j = 0; j < i; ++j) { 2465 if (base[j] != NULL) { 2466 unmap_memory(base[j], size[j]); 2467 } 2468 } 2469 2470 if (i < max_tries) { 2471 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2472 return requested_addr; 2473 } else { 2474 _highest_vm_reserved_address = old_highest; 2475 return NULL; 2476 } 2477} 2478 2479size_t os::read(int fd, void *buf, unsigned int nBytes) { 2480 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2481} 2482 2483// TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2484// Solaris uses poll(), bsd uses park(). 2485// Poll() is likely a better choice, assuming that Thread.interrupt() 2486// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2487// SIGSEGV, see 4355769. 2488 2489int os::sleep(Thread* thread, jlong millis, bool interruptible) { 2490 assert(thread == Thread::current(), "thread consistency check"); 2491 2492 ParkEvent * const slp = thread->_SleepEvent ; 2493 slp->reset() ; 2494 OrderAccess::fence() ; 2495 2496 if (interruptible) { 2497 jlong prevtime = javaTimeNanos(); 2498 2499 for (;;) { 2500 if (os::is_interrupted(thread, true)) { 2501 return OS_INTRPT; 2502 } 2503 2504 jlong newtime = javaTimeNanos(); 2505 2506 if (newtime - prevtime < 0) { 2507 // time moving backwards, should only happen if no monotonic clock 2508 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2509 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2510 } else { 2511 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2512 } 2513 2514 if(millis <= 0) { 2515 return OS_OK; 2516 } 2517 2518 prevtime = newtime; 2519 2520 { 2521 assert(thread->is_Java_thread(), "sanity check"); 2522 JavaThread *jt = (JavaThread *) thread; 2523 ThreadBlockInVM tbivm(jt); 2524 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2525 2526 jt->set_suspend_equivalent(); 2527 // cleared by handle_special_suspend_equivalent_condition() or 2528 // java_suspend_self() via check_and_wait_while_suspended() 2529 2530 slp->park(millis); 2531 2532 // were we externally suspended while we were waiting? 2533 jt->check_and_wait_while_suspended(); 2534 } 2535 } 2536 } else { 2537 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2538 jlong prevtime = javaTimeNanos(); 2539 2540 for (;;) { 2541 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2542 // the 1st iteration ... 2543 jlong newtime = javaTimeNanos(); 2544 2545 if (newtime - prevtime < 0) { 2546 // time moving backwards, should only happen if no monotonic clock 2547 // not a guarantee() because JVM should not abort on kernel/glibc bugs 2548 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2549 } else { 2550 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2551 } 2552 2553 if(millis <= 0) break ; 2554 2555 prevtime = newtime; 2556 slp->park(millis); 2557 } 2558 return OS_OK ; 2559 } 2560} 2561 2562int os::naked_sleep() { 2563 // %% make the sleep time an integer flag. for now use 1 millisec. 2564 return os::sleep(Thread::current(), 1, false); 2565} 2566 2567// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2568void os::infinite_sleep() { 2569 while (true) { // sleep forever ... 2570 ::sleep(100); // ... 100 seconds at a time 2571 } 2572} 2573 2574// Used to convert frequent JVM_Yield() to nops 2575bool os::dont_yield() { 2576 return DontYieldALot; 2577} 2578 2579void os::yield() { 2580 sched_yield(); 2581} 2582 2583os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2584 2585void os::yield_all(int attempts) { 2586 // Yields to all threads, including threads with lower priorities 2587 // Threads on Bsd are all with same priority. The Solaris style 2588 // os::yield_all() with nanosleep(1ms) is not necessary. 2589 sched_yield(); 2590} 2591 2592// Called from the tight loops to possibly influence time-sharing heuristics 2593void os::loop_breaker(int attempts) { 2594 os::yield_all(attempts); 2595} 2596 2597//////////////////////////////////////////////////////////////////////////////// 2598// thread priority support 2599 2600// Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2601// only supports dynamic priority, static priority must be zero. For real-time 2602// applications, Bsd supports SCHED_RR which allows static priority (1-99). 2603// However, for large multi-threaded applications, SCHED_RR is not only slower 2604// than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2605// of 5 runs - Sep 2005). 2606// 2607// The following code actually changes the niceness of kernel-thread/LWP. It 2608// has an assumption that setpriority() only modifies one kernel-thread/LWP, 2609// not the entire user process, and user level threads are 1:1 mapped to kernel 2610// threads. It has always been the case, but could change in the future. For 2611// this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2612// It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2613 2614#if !defined(__APPLE__) 2615int os::java_to_os_priority[CriticalPriority + 1] = { 2616 19, // 0 Entry should never be used 2617 2618 0, // 1 MinPriority 2619 3, // 2 2620 6, // 3 2621 2622 10, // 4 2623 15, // 5 NormPriority 2624 18, // 6 2625 2626 21, // 7 2627 25, // 8 2628 28, // 9 NearMaxPriority 2629 2630 31, // 10 MaxPriority 2631 2632 31 // 11 CriticalPriority 2633}; 2634#else 2635/* Using Mach high-level priority assignments */ 2636int os::java_to_os_priority[CriticalPriority + 1] = { 2637 0, // 0 Entry should never be used (MINPRI_USER) 2638 2639 27, // 1 MinPriority 2640 28, // 2 2641 29, // 3 2642 2643 30, // 4 2644 31, // 5 NormPriority (BASEPRI_DEFAULT) 2645 32, // 6 2646 2647 33, // 7 2648 34, // 8 2649 35, // 9 NearMaxPriority 2650 2651 36, // 10 MaxPriority 2652 2653 36 // 11 CriticalPriority 2654}; 2655#endif 2656 2657static int prio_init() { 2658 if (ThreadPriorityPolicy == 1) { 2659 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2660 // if effective uid is not root. Perhaps, a more elegant way of doing 2661 // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2662 if (geteuid() != 0) { 2663 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2664 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2665 } 2666 ThreadPriorityPolicy = 0; 2667 } 2668 } 2669 if (UseCriticalJavaThreadPriority) { 2670 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2671 } 2672 return 0; 2673} 2674 2675OSReturn os::set_native_priority(Thread* thread, int newpri) { 2676 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2677 2678#ifdef __OpenBSD__ 2679 // OpenBSD pthread_setprio starves low priority threads 2680 return OS_OK; 2681#elif defined(__FreeBSD__) 2682 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2683#elif defined(__APPLE__) || defined(__NetBSD__) 2684 struct sched_param sp; 2685 int policy; 2686 pthread_t self = pthread_self(); 2687 2688 if (pthread_getschedparam(self, &policy, &sp) != 0) 2689 return OS_ERR; 2690 2691 sp.sched_priority = newpri; 2692 if (pthread_setschedparam(self, policy, &sp) != 0) 2693 return OS_ERR; 2694 2695 return OS_OK; 2696#else 2697 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2698 return (ret == 0) ? OS_OK : OS_ERR; 2699#endif 2700} 2701 2702OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2703 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2704 *priority_ptr = java_to_os_priority[NormPriority]; 2705 return OS_OK; 2706 } 2707 2708 errno = 0; 2709#if defined(__OpenBSD__) || defined(__FreeBSD__) 2710 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2711#elif defined(__APPLE__) || defined(__NetBSD__) 2712 int policy; 2713 struct sched_param sp; 2714 2715 pthread_getschedparam(pthread_self(), &policy, &sp); 2716 *priority_ptr = sp.sched_priority; 2717#else 2718 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2719#endif 2720 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2721} 2722 2723// Hint to the underlying OS that a task switch would not be good. 2724// Void return because it's a hint and can fail. 2725void os::hint_no_preempt() {} 2726 2727//////////////////////////////////////////////////////////////////////////////// 2728// suspend/resume support 2729 2730// the low-level signal-based suspend/resume support is a remnant from the 2731// old VM-suspension that used to be for java-suspension, safepoints etc, 2732// within hotspot. Now there is a single use-case for this: 2733// - calling get_thread_pc() on the VMThread by the flat-profiler task 2734// that runs in the watcher thread. 2735// The remaining code is greatly simplified from the more general suspension 2736// code that used to be used. 2737// 2738// The protocol is quite simple: 2739// - suspend: 2740// - sends a signal to the target thread 2741// - polls the suspend state of the osthread using a yield loop 2742// - target thread signal handler (SR_handler) sets suspend state 2743// and blocks in sigsuspend until continued 2744// - resume: 2745// - sets target osthread state to continue 2746// - sends signal to end the sigsuspend loop in the SR_handler 2747// 2748// Note that the SR_lock plays no role in this suspend/resume protocol. 2749// 2750 2751static void resume_clear_context(OSThread *osthread) { 2752 osthread->set_ucontext(NULL); 2753 osthread->set_siginfo(NULL); 2754} 2755 2756static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2757 osthread->set_ucontext(context); 2758 osthread->set_siginfo(siginfo); 2759} 2760 2761// 2762// Handler function invoked when a thread's execution is suspended or 2763// resumed. We have to be careful that only async-safe functions are 2764// called here (Note: most pthread functions are not async safe and 2765// should be avoided.) 2766// 2767// Note: sigwait() is a more natural fit than sigsuspend() from an 2768// interface point of view, but sigwait() prevents the signal hander 2769// from being run. libpthread would get very confused by not having 2770// its signal handlers run and prevents sigwait()'s use with the 2771// mutex granting granting signal. 2772// 2773// Currently only ever called on the VMThread or JavaThread 2774// 2775static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2776 // Save and restore errno to avoid confusing native code with EINTR 2777 // after sigsuspend. 2778 int old_errno = errno; 2779 2780 Thread* thread = Thread::current(); 2781 OSThread* osthread = thread->osthread(); 2782 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2783 2784 os::SuspendResume::State current = osthread->sr.state(); 2785 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2786 suspend_save_context(osthread, siginfo, context); 2787 2788 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2789 os::SuspendResume::State state = osthread->sr.suspended(); 2790 if (state == os::SuspendResume::SR_SUSPENDED) { 2791 sigset_t suspend_set; // signals for sigsuspend() 2792 2793 // get current set of blocked signals and unblock resume signal 2794 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2795 sigdelset(&suspend_set, SR_signum); 2796 2797 sr_semaphore.signal(); 2798 // wait here until we are resumed 2799 while (1) { 2800 sigsuspend(&suspend_set); 2801 2802 os::SuspendResume::State result = osthread->sr.running(); 2803 if (result == os::SuspendResume::SR_RUNNING) { 2804 sr_semaphore.signal(); 2805 break; 2806 } else if (result != os::SuspendResume::SR_SUSPENDED) { 2807 ShouldNotReachHere(); 2808 } 2809 } 2810 2811 } else if (state == os::SuspendResume::SR_RUNNING) { 2812 // request was cancelled, continue 2813 } else { 2814 ShouldNotReachHere(); 2815 } 2816 2817 resume_clear_context(osthread); 2818 } else if (current == os::SuspendResume::SR_RUNNING) { 2819 // request was cancelled, continue 2820 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2821 // ignore 2822 } else { 2823 // ignore 2824 } 2825 2826 errno = old_errno; 2827} 2828 2829 2830static int SR_initialize() { 2831 struct sigaction act; 2832 char *s; 2833 /* Get signal number to use for suspend/resume */ 2834 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2835 int sig = ::strtol(s, 0, 10); 2836 if (sig > 0 || sig < NSIG) { 2837 SR_signum = sig; 2838 } 2839 } 2840 2841 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2842 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2843 2844 sigemptyset(&SR_sigset); 2845 sigaddset(&SR_sigset, SR_signum); 2846 2847 /* Set up signal handler for suspend/resume */ 2848 act.sa_flags = SA_RESTART|SA_SIGINFO; 2849 act.sa_handler = (void (*)(int)) SR_handler; 2850 2851 // SR_signum is blocked by default. 2852 // 4528190 - We also need to block pthread restart signal (32 on all 2853 // supported Bsd platforms). Note that BsdThreads need to block 2854 // this signal for all threads to work properly. So we don't have 2855 // to use hard-coded signal number when setting up the mask. 2856 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2857 2858 if (sigaction(SR_signum, &act, 0) == -1) { 2859 return -1; 2860 } 2861 2862 // Save signal flag 2863 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2864 return 0; 2865} 2866 2867static int sr_notify(OSThread* osthread) { 2868 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2869 assert_status(status == 0, status, "pthread_kill"); 2870 return status; 2871} 2872 2873// "Randomly" selected value for how long we want to spin 2874// before bailing out on suspending a thread, also how often 2875// we send a signal to a thread we want to resume 2876static const int RANDOMLY_LARGE_INTEGER = 1000000; 2877static const int RANDOMLY_LARGE_INTEGER2 = 100; 2878 2879// returns true on success and false on error - really an error is fatal 2880// but this seems the normal response to library errors 2881static bool do_suspend(OSThread* osthread) { 2882 assert(osthread->sr.is_running(), "thread should be running"); 2883 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2884 2885 // mark as suspended and send signal 2886 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2887 // failed to switch, state wasn't running? 2888 ShouldNotReachHere(); 2889 return false; 2890 } 2891 2892 if (sr_notify(osthread) != 0) { 2893 ShouldNotReachHere(); 2894 } 2895 2896 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2897 while (true) { 2898 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2899 break; 2900 } else { 2901 // timeout 2902 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2903 if (cancelled == os::SuspendResume::SR_RUNNING) { 2904 return false; 2905 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2906 // make sure that we consume the signal on the semaphore as well 2907 sr_semaphore.wait(); 2908 break; 2909 } else { 2910 ShouldNotReachHere(); 2911 return false; 2912 } 2913 } 2914 } 2915 2916 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2917 return true; 2918} 2919 2920static void do_resume(OSThread* osthread) { 2921 assert(osthread->sr.is_suspended(), "thread should be suspended"); 2922 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2923 2924 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2925 // failed to switch to WAKEUP_REQUEST 2926 ShouldNotReachHere(); 2927 return; 2928 } 2929 2930 while (true) { 2931 if (sr_notify(osthread) == 0) { 2932 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2933 if (osthread->sr.is_running()) { 2934 return; 2935 } 2936 } 2937 } else { 2938 ShouldNotReachHere(); 2939 } 2940 } 2941 2942 guarantee(osthread->sr.is_running(), "Must be running!"); 2943} 2944 2945//////////////////////////////////////////////////////////////////////////////// 2946// interrupt support 2947 2948void os::interrupt(Thread* thread) { 2949 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2950 "possibility of dangling Thread pointer"); 2951 2952 OSThread* osthread = thread->osthread(); 2953 2954 if (!osthread->interrupted()) { 2955 osthread->set_interrupted(true); 2956 // More than one thread can get here with the same value of osthread, 2957 // resulting in multiple notifications. We do, however, want the store 2958 // to interrupted() to be visible to other threads before we execute unpark(). 2959 OrderAccess::fence(); 2960 ParkEvent * const slp = thread->_SleepEvent ; 2961 if (slp != NULL) slp->unpark() ; 2962 } 2963 2964 // For JSR166. Unpark even if interrupt status already was set 2965 if (thread->is_Java_thread()) 2966 ((JavaThread*)thread)->parker()->unpark(); 2967 2968 ParkEvent * ev = thread->_ParkEvent ; 2969 if (ev != NULL) ev->unpark() ; 2970 2971} 2972 2973bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2974 assert(Thread::current() == thread || Threads_lock->owned_by_self(), 2975 "possibility of dangling Thread pointer"); 2976 2977 OSThread* osthread = thread->osthread(); 2978 2979 bool interrupted = osthread->interrupted(); 2980 2981 if (interrupted && clear_interrupted) { 2982 osthread->set_interrupted(false); 2983 // consider thread->_SleepEvent->reset() ... optional optimization 2984 } 2985 2986 return interrupted; 2987} 2988 2989/////////////////////////////////////////////////////////////////////////////////// 2990// signal handling (except suspend/resume) 2991 2992// This routine may be used by user applications as a "hook" to catch signals. 2993// The user-defined signal handler must pass unrecognized signals to this 2994// routine, and if it returns true (non-zero), then the signal handler must 2995// return immediately. If the flag "abort_if_unrecognized" is true, then this 2996// routine will never retun false (zero), but instead will execute a VM panic 2997// routine kill the process. 2998// 2999// If this routine returns false, it is OK to call it again. This allows 3000// the user-defined signal handler to perform checks either before or after 3001// the VM performs its own checks. Naturally, the user code would be making 3002// a serious error if it tried to handle an exception (such as a null check 3003// or breakpoint) that the VM was generating for its own correct operation. 3004// 3005// This routine may recognize any of the following kinds of signals: 3006// SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 3007// It should be consulted by handlers for any of those signals. 3008// 3009// The caller of this routine must pass in the three arguments supplied 3010// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3011// field of the structure passed to sigaction(). This routine assumes that 3012// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3013// 3014// Note that the VM will print warnings if it detects conflicting signal 3015// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3016// 3017extern "C" JNIEXPORT int 3018JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 3019 void* ucontext, int abort_if_unrecognized); 3020 3021void signalHandler(int sig, siginfo_t* info, void* uc) { 3022 assert(info != NULL && uc != NULL, "it must be old kernel"); 3023 int orig_errno = errno; // Preserve errno value over signal handler. 3024 JVM_handle_bsd_signal(sig, info, uc, true); 3025 errno = orig_errno; 3026} 3027 3028 3029// This boolean allows users to forward their own non-matching signals 3030// to JVM_handle_bsd_signal, harmlessly. 3031bool os::Bsd::signal_handlers_are_installed = false; 3032 3033// For signal-chaining 3034struct sigaction os::Bsd::sigact[MAXSIGNUM]; 3035unsigned int os::Bsd::sigs = 0; 3036bool os::Bsd::libjsig_is_loaded = false; 3037typedef struct sigaction *(*get_signal_t)(int); 3038get_signal_t os::Bsd::get_signal_action = NULL; 3039 3040struct sigaction* os::Bsd::get_chained_signal_action(int sig) { 3041 struct sigaction *actp = NULL; 3042 3043 if (libjsig_is_loaded) { 3044 // Retrieve the old signal handler from libjsig 3045 actp = (*get_signal_action)(sig); 3046 } 3047 if (actp == NULL) { 3048 // Retrieve the preinstalled signal handler from jvm 3049 actp = get_preinstalled_handler(sig); 3050 } 3051 3052 return actp; 3053} 3054 3055static bool call_chained_handler(struct sigaction *actp, int sig, 3056 siginfo_t *siginfo, void *context) { 3057 // Call the old signal handler 3058 if (actp->sa_handler == SIG_DFL) { 3059 // It's more reasonable to let jvm treat it as an unexpected exception 3060 // instead of taking the default action. 3061 return false; 3062 } else if (actp->sa_handler != SIG_IGN) { 3063 if ((actp->sa_flags & SA_NODEFER) == 0) { 3064 // automaticlly block the signal 3065 sigaddset(&(actp->sa_mask), sig); 3066 } 3067 3068 sa_handler_t hand; 3069 sa_sigaction_t sa; 3070 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3071 // retrieve the chained handler 3072 if (siginfo_flag_set) { 3073 sa = actp->sa_sigaction; 3074 } else { 3075 hand = actp->sa_handler; 3076 } 3077 3078 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3079 actp->sa_handler = SIG_DFL; 3080 } 3081 3082 // try to honor the signal mask 3083 sigset_t oset; 3084 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3085 3086 // call into the chained handler 3087 if (siginfo_flag_set) { 3088 (*sa)(sig, siginfo, context); 3089 } else { 3090 (*hand)(sig); 3091 } 3092 3093 // restore the signal mask 3094 pthread_sigmask(SIG_SETMASK, &oset, 0); 3095 } 3096 // Tell jvm's signal handler the signal is taken care of. 3097 return true; 3098} 3099 3100bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3101 bool chained = false; 3102 // signal-chaining 3103 if (UseSignalChaining) { 3104 struct sigaction *actp = get_chained_signal_action(sig); 3105 if (actp != NULL) { 3106 chained = call_chained_handler(actp, sig, siginfo, context); 3107 } 3108 } 3109 return chained; 3110} 3111 3112struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3113 if ((( (unsigned int)1 << sig ) & sigs) != 0) { 3114 return &sigact[sig]; 3115 } 3116 return NULL; 3117} 3118 3119void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3120 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3121 sigact[sig] = oldAct; 3122 sigs |= (unsigned int)1 << sig; 3123} 3124 3125// for diagnostic 3126int os::Bsd::sigflags[MAXSIGNUM]; 3127 3128int os::Bsd::get_our_sigflags(int sig) { 3129 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3130 return sigflags[sig]; 3131} 3132 3133void os::Bsd::set_our_sigflags(int sig, int flags) { 3134 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3135 sigflags[sig] = flags; 3136} 3137 3138void os::Bsd::set_signal_handler(int sig, bool set_installed) { 3139 // Check for overwrite. 3140 struct sigaction oldAct; 3141 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3142 3143 void* oldhand = oldAct.sa_sigaction 3144 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3145 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3146 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3147 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3148 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3149 if (AllowUserSignalHandlers || !set_installed) { 3150 // Do not overwrite; user takes responsibility to forward to us. 3151 return; 3152 } else if (UseSignalChaining) { 3153 // save the old handler in jvm 3154 save_preinstalled_handler(sig, oldAct); 3155 // libjsig also interposes the sigaction() call below and saves the 3156 // old sigaction on it own. 3157 } else { 3158 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3159 "%#lx for signal %d.", (long)oldhand, sig)); 3160 } 3161 } 3162 3163 struct sigaction sigAct; 3164 sigfillset(&(sigAct.sa_mask)); 3165 sigAct.sa_handler = SIG_DFL; 3166 if (!set_installed) { 3167 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3168 } else { 3169 sigAct.sa_sigaction = signalHandler; 3170 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3171 } 3172#if __APPLE__ 3173 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3174 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3175 // if the signal handler declares it will handle it on alternate stack. 3176 // Notice we only declare we will handle it on alt stack, but we are not 3177 // actually going to use real alt stack - this is just a workaround. 3178 // Please see ux_exception.c, method catch_mach_exception_raise for details 3179 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3180 if (sig == SIGSEGV) { 3181 sigAct.sa_flags |= SA_ONSTACK; 3182 } 3183#endif 3184 3185 // Save flags, which are set by ours 3186 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3187 sigflags[sig] = sigAct.sa_flags; 3188 3189 int ret = sigaction(sig, &sigAct, &oldAct); 3190 assert(ret == 0, "check"); 3191 3192 void* oldhand2 = oldAct.sa_sigaction 3193 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3194 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3195 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3196} 3197 3198// install signal handlers for signals that HotSpot needs to 3199// handle in order to support Java-level exception handling. 3200 3201void os::Bsd::install_signal_handlers() { 3202 if (!signal_handlers_are_installed) { 3203 signal_handlers_are_installed = true; 3204 3205 // signal-chaining 3206 typedef void (*signal_setting_t)(); 3207 signal_setting_t begin_signal_setting = NULL; 3208 signal_setting_t end_signal_setting = NULL; 3209 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3210 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3211 if (begin_signal_setting != NULL) { 3212 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3213 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3214 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3215 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3216 libjsig_is_loaded = true; 3217 assert(UseSignalChaining, "should enable signal-chaining"); 3218 } 3219 if (libjsig_is_loaded) { 3220 // Tell libjsig jvm is setting signal handlers 3221 (*begin_signal_setting)(); 3222 } 3223 3224 set_signal_handler(SIGSEGV, true); 3225 set_signal_handler(SIGPIPE, true); 3226 set_signal_handler(SIGBUS, true); 3227 set_signal_handler(SIGILL, true); 3228 set_signal_handler(SIGFPE, true); 3229 set_signal_handler(SIGXFSZ, true); 3230 3231#if defined(__APPLE__) 3232 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3233 // signals caught and handled by the JVM. To work around this, we reset the mach task 3234 // signal handler that's placed on our process by CrashReporter. This disables 3235 // CrashReporter-based reporting. 3236 // 3237 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3238 // on caught fatal signals. 3239 // 3240 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3241 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3242 // exception handling, while leaving the standard BSD signal handlers functional. 3243 kern_return_t kr; 3244 kr = task_set_exception_ports(mach_task_self(), 3245 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3246 MACH_PORT_NULL, 3247 EXCEPTION_STATE_IDENTITY, 3248 MACHINE_THREAD_STATE); 3249 3250 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3251#endif 3252 3253 if (libjsig_is_loaded) { 3254 // Tell libjsig jvm finishes setting signal handlers 3255 (*end_signal_setting)(); 3256 } 3257 3258 // We don't activate signal checker if libjsig is in place, we trust ourselves 3259 // and if UserSignalHandler is installed all bets are off 3260 if (CheckJNICalls) { 3261 if (libjsig_is_loaded) { 3262 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3263 check_signals = false; 3264 } 3265 if (AllowUserSignalHandlers) { 3266 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3267 check_signals = false; 3268 } 3269 } 3270 } 3271} 3272 3273 3274///// 3275// glibc on Bsd platform uses non-documented flag 3276// to indicate, that some special sort of signal 3277// trampoline is used. 3278// We will never set this flag, and we should 3279// ignore this flag in our diagnostic 3280#ifdef SIGNIFICANT_SIGNAL_MASK 3281#undef SIGNIFICANT_SIGNAL_MASK 3282#endif 3283#define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3284 3285static const char* get_signal_handler_name(address handler, 3286 char* buf, int buflen) { 3287 int offset; 3288 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3289 if (found) { 3290 // skip directory names 3291 const char *p1, *p2; 3292 p1 = buf; 3293 size_t len = strlen(os::file_separator()); 3294 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3295 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3296 } else { 3297 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3298 } 3299 return buf; 3300} 3301 3302static void print_signal_handler(outputStream* st, int sig, 3303 char* buf, size_t buflen) { 3304 struct sigaction sa; 3305 3306 sigaction(sig, NULL, &sa); 3307 3308 // See comment for SIGNIFICANT_SIGNAL_MASK define 3309 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3310 3311 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3312 3313 address handler = (sa.sa_flags & SA_SIGINFO) 3314 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3315 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3316 3317 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3318 st->print("SIG_DFL"); 3319 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3320 st->print("SIG_IGN"); 3321 } else { 3322 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3323 } 3324 3325 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3326 3327 address rh = VMError::get_resetted_sighandler(sig); 3328 // May be, handler was resetted by VMError? 3329 if(rh != NULL) { 3330 handler = rh; 3331 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3332 } 3333 3334 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3335 3336 // Check: is it our handler? 3337 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3338 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3339 // It is our signal handler 3340 // check for flags, reset system-used one! 3341 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3342 st->print( 3343 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3344 os::Bsd::get_our_sigflags(sig)); 3345 } 3346 } 3347 st->cr(); 3348} 3349 3350 3351#define DO_SIGNAL_CHECK(sig) \ 3352 if (!sigismember(&check_signal_done, sig)) \ 3353 os::Bsd::check_signal_handler(sig) 3354 3355// This method is a periodic task to check for misbehaving JNI applications 3356// under CheckJNI, we can add any periodic checks here 3357 3358void os::run_periodic_checks() { 3359 3360 if (check_signals == false) return; 3361 3362 // SEGV and BUS if overridden could potentially prevent 3363 // generation of hs*.log in the event of a crash, debugging 3364 // such a case can be very challenging, so we absolutely 3365 // check the following for a good measure: 3366 DO_SIGNAL_CHECK(SIGSEGV); 3367 DO_SIGNAL_CHECK(SIGILL); 3368 DO_SIGNAL_CHECK(SIGFPE); 3369 DO_SIGNAL_CHECK(SIGBUS); 3370 DO_SIGNAL_CHECK(SIGPIPE); 3371 DO_SIGNAL_CHECK(SIGXFSZ); 3372 3373 3374 // ReduceSignalUsage allows the user to override these handlers 3375 // see comments at the very top and jvm_solaris.h 3376 if (!ReduceSignalUsage) { 3377 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3378 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3379 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3380 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3381 } 3382 3383 DO_SIGNAL_CHECK(SR_signum); 3384 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3385} 3386 3387typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3388 3389static os_sigaction_t os_sigaction = NULL; 3390 3391void os::Bsd::check_signal_handler(int sig) { 3392 char buf[O_BUFLEN]; 3393 address jvmHandler = NULL; 3394 3395 3396 struct sigaction act; 3397 if (os_sigaction == NULL) { 3398 // only trust the default sigaction, in case it has been interposed 3399 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3400 if (os_sigaction == NULL) return; 3401 } 3402 3403 os_sigaction(sig, (struct sigaction*)NULL, &act); 3404 3405 3406 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3407 3408 address thisHandler = (act.sa_flags & SA_SIGINFO) 3409 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3410 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3411 3412 3413 switch(sig) { 3414 case SIGSEGV: 3415 case SIGBUS: 3416 case SIGFPE: 3417 case SIGPIPE: 3418 case SIGILL: 3419 case SIGXFSZ: 3420 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3421 break; 3422 3423 case SHUTDOWN1_SIGNAL: 3424 case SHUTDOWN2_SIGNAL: 3425 case SHUTDOWN3_SIGNAL: 3426 case BREAK_SIGNAL: 3427 jvmHandler = (address)user_handler(); 3428 break; 3429 3430 case INTERRUPT_SIGNAL: 3431 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3432 break; 3433 3434 default: 3435 if (sig == SR_signum) { 3436 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3437 } else { 3438 return; 3439 } 3440 break; 3441 } 3442 3443 if (thisHandler != jvmHandler) { 3444 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3445 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3446 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3447 // No need to check this sig any longer 3448 sigaddset(&check_signal_done, sig); 3449 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3450 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3451 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3452 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3453 // No need to check this sig any longer 3454 sigaddset(&check_signal_done, sig); 3455 } 3456 3457 // Dump all the signal 3458 if (sigismember(&check_signal_done, sig)) { 3459 print_signal_handlers(tty, buf, O_BUFLEN); 3460 } 3461} 3462 3463extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3464 3465extern bool signal_name(int signo, char* buf, size_t len); 3466 3467const char* os::exception_name(int exception_code, char* buf, size_t size) { 3468 if (0 < exception_code && exception_code <= SIGRTMAX) { 3469 // signal 3470 if (!signal_name(exception_code, buf, size)) { 3471 jio_snprintf(buf, size, "SIG%d", exception_code); 3472 } 3473 return buf; 3474 } else { 3475 return NULL; 3476 } 3477} 3478 3479// this is called _before_ the most of global arguments have been parsed 3480void os::init(void) { 3481 char dummy; /* used to get a guess on initial stack address */ 3482// first_hrtime = gethrtime(); 3483 3484 // With BsdThreads the JavaMain thread pid (primordial thread) 3485 // is different than the pid of the java launcher thread. 3486 // So, on Bsd, the launcher thread pid is passed to the VM 3487 // via the sun.java.launcher.pid property. 3488 // Use this property instead of getpid() if it was correctly passed. 3489 // See bug 6351349. 3490 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3491 3492 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3493 3494 clock_tics_per_sec = CLK_TCK; 3495 3496 init_random(1234567); 3497 3498 ThreadCritical::initialize(); 3499 3500 Bsd::set_page_size(getpagesize()); 3501 if (Bsd::page_size() == -1) { 3502 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3503 strerror(errno))); 3504 } 3505 init_page_sizes((size_t) Bsd::page_size()); 3506 3507 Bsd::initialize_system_info(); 3508 3509 // main_thread points to the aboriginal thread 3510 Bsd::_main_thread = pthread_self(); 3511 3512 Bsd::clock_init(); 3513 initial_time_count = os::elapsed_counter(); 3514 3515#ifdef __APPLE__ 3516 // XXXDARWIN 3517 // Work around the unaligned VM callbacks in hotspot's 3518 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3519 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3520 // alignment when doing symbol lookup. To work around this, we force early 3521 // binding of all symbols now, thus binding when alignment is known-good. 3522 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3523#endif 3524} 3525 3526// To install functions for atexit system call 3527extern "C" { 3528 static void perfMemory_exit_helper() { 3529 perfMemory_exit(); 3530 } 3531} 3532 3533// this is called _after_ the global arguments have been parsed 3534jint os::init_2(void) 3535{ 3536 // Allocate a single page and mark it as readable for safepoint polling 3537 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3538 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3539 3540 os::set_polling_page( polling_page ); 3541 3542#ifndef PRODUCT 3543 if(Verbose && PrintMiscellaneous) 3544 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3545#endif 3546 3547 if (!UseMembar) { 3548 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3549 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3550 os::set_memory_serialize_page( mem_serialize_page ); 3551 3552#ifndef PRODUCT 3553 if(Verbose && PrintMiscellaneous) 3554 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3555#endif 3556 } 3557 3558 os::large_page_init(); 3559 3560 // initialize suspend/resume support - must do this before signal_sets_init() 3561 if (SR_initialize() != 0) { 3562 perror("SR_initialize failed"); 3563 return JNI_ERR; 3564 } 3565 3566 Bsd::signal_sets_init(); 3567 Bsd::install_signal_handlers(); 3568 3569 // Check minimum allowable stack size for thread creation and to initialize 3570 // the java system classes, including StackOverflowError - depends on page 3571 // size. Add a page for compiler2 recursion in main thread. 3572 // Add in 2*BytesPerWord times page size to account for VM stack during 3573 // class initialization depending on 32 or 64 bit VM. 3574 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3575 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3576 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3577 3578 size_t threadStackSizeInBytes = ThreadStackSize * K; 3579 if (threadStackSizeInBytes != 0 && 3580 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3581 tty->print_cr("\nThe stack size specified is too small, " 3582 "Specify at least %dk", 3583 os::Bsd::min_stack_allowed/ K); 3584 return JNI_ERR; 3585 } 3586 3587 // Make the stack size a multiple of the page size so that 3588 // the yellow/red zones can be guarded. 3589 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3590 vm_page_size())); 3591 3592 if (MaxFDLimit) { 3593 // set the number of file descriptors to max. print out error 3594 // if getrlimit/setrlimit fails but continue regardless. 3595 struct rlimit nbr_files; 3596 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3597 if (status != 0) { 3598 if (PrintMiscellaneous && (Verbose || WizardMode)) 3599 perror("os::init_2 getrlimit failed"); 3600 } else { 3601 nbr_files.rlim_cur = nbr_files.rlim_max; 3602 3603#ifdef __APPLE__ 3604 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3605 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3606 // be used instead 3607 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3608#endif 3609 3610 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3611 if (status != 0) { 3612 if (PrintMiscellaneous && (Verbose || WizardMode)) 3613 perror("os::init_2 setrlimit failed"); 3614 } 3615 } 3616 } 3617 3618 // at-exit methods are called in the reverse order of their registration. 3619 // atexit functions are called on return from main or as a result of a 3620 // call to exit(3C). There can be only 32 of these functions registered 3621 // and atexit() does not set errno. 3622 3623 if (PerfAllowAtExitRegistration) { 3624 // only register atexit functions if PerfAllowAtExitRegistration is set. 3625 // atexit functions can be delayed until process exit time, which 3626 // can be problematic for embedded VM situations. Embedded VMs should 3627 // call DestroyJavaVM() to assure that VM resources are released. 3628 3629 // note: perfMemory_exit_helper atexit function may be removed in 3630 // the future if the appropriate cleanup code can be added to the 3631 // VM_Exit VMOperation's doit method. 3632 if (atexit(perfMemory_exit_helper) != 0) { 3633 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3634 } 3635 } 3636 3637 // initialize thread priority policy 3638 prio_init(); 3639 3640#ifdef __APPLE__ 3641 // dynamically link to objective c gc registration 3642 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3643 if (handleLibObjc != NULL) { 3644 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3645 } 3646#endif 3647 3648 return JNI_OK; 3649} 3650 3651// this is called at the end of vm_initialization 3652void os::init_3(void) { } 3653 3654// Mark the polling page as unreadable 3655void os::make_polling_page_unreadable(void) { 3656 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3657 fatal("Could not disable polling page"); 3658}; 3659 3660// Mark the polling page as readable 3661void os::make_polling_page_readable(void) { 3662 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3663 fatal("Could not enable polling page"); 3664 } 3665}; 3666 3667int os::active_processor_count() { 3668 return _processor_count; 3669} 3670 3671void os::set_native_thread_name(const char *name) { 3672#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3673 // This is only supported in Snow Leopard and beyond 3674 if (name != NULL) { 3675 // Add a "Java: " prefix to the name 3676 char buf[MAXTHREADNAMESIZE]; 3677 snprintf(buf, sizeof(buf), "Java: %s", name); 3678 pthread_setname_np(buf); 3679 } 3680#endif 3681} 3682 3683bool os::distribute_processes(uint length, uint* distribution) { 3684 // Not yet implemented. 3685 return false; 3686} 3687 3688bool os::bind_to_processor(uint processor_id) { 3689 // Not yet implemented. 3690 return false; 3691} 3692 3693void os::SuspendedThreadTask::internal_do_task() { 3694 if (do_suspend(_thread->osthread())) { 3695 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3696 do_task(context); 3697 do_resume(_thread->osthread()); 3698 } 3699} 3700 3701/// 3702class PcFetcher : public os::SuspendedThreadTask { 3703public: 3704 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3705 ExtendedPC result(); 3706protected: 3707 void do_task(const os::SuspendedThreadTaskContext& context); 3708private: 3709 ExtendedPC _epc; 3710}; 3711 3712ExtendedPC PcFetcher::result() { 3713 guarantee(is_done(), "task is not done yet."); 3714 return _epc; 3715} 3716 3717void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3718 Thread* thread = context.thread(); 3719 OSThread* osthread = thread->osthread(); 3720 if (osthread->ucontext() != NULL) { 3721 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); 3722 } else { 3723 // NULL context is unexpected, double-check this is the VMThread 3724 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3725 } 3726} 3727 3728// Suspends the target using the signal mechanism and then grabs the PC before 3729// resuming the target. Used by the flat-profiler only 3730ExtendedPC os::get_thread_pc(Thread* thread) { 3731 // Make sure that it is called by the watcher for the VMThread 3732 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3733 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3734 3735 PcFetcher fetcher(thread); 3736 fetcher.run(); 3737 return fetcher.result(); 3738} 3739 3740int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3741{ 3742 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3743} 3744 3745//////////////////////////////////////////////////////////////////////////////// 3746// debug support 3747 3748bool os::find(address addr, outputStream* st) { 3749 Dl_info dlinfo; 3750 memset(&dlinfo, 0, sizeof(dlinfo)); 3751 if (dladdr(addr, &dlinfo)) { 3752 st->print(PTR_FORMAT ": ", addr); 3753 if (dlinfo.dli_sname != NULL) { 3754 st->print("%s+%#x", dlinfo.dli_sname, 3755 addr - (intptr_t)dlinfo.dli_saddr); 3756 } else if (dlinfo.dli_fname) { 3757 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3758 } else { 3759 st->print("<absolute address>"); 3760 } 3761 if (dlinfo.dli_fname) { 3762 st->print(" in %s", dlinfo.dli_fname); 3763 } 3764 if (dlinfo.dli_fbase) { 3765 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3766 } 3767 st->cr(); 3768 3769 if (Verbose) { 3770 // decode some bytes around the PC 3771 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3772 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3773 address lowest = (address) dlinfo.dli_sname; 3774 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3775 if (begin < lowest) begin = lowest; 3776 Dl_info dlinfo2; 3777 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 3778 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3779 end = (address) dlinfo2.dli_saddr; 3780 Disassembler::decode(begin, end, st); 3781 } 3782 return true; 3783 } 3784 return false; 3785} 3786 3787//////////////////////////////////////////////////////////////////////////////// 3788// misc 3789 3790// This does not do anything on Bsd. This is basically a hook for being 3791// able to use structured exception handling (thread-local exception filters) 3792// on, e.g., Win32. 3793void 3794os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3795 JavaCallArguments* args, Thread* thread) { 3796 f(value, method, args, thread); 3797} 3798 3799void os::print_statistics() { 3800} 3801 3802int os::message_box(const char* title, const char* message) { 3803 int i; 3804 fdStream err(defaultStream::error_fd()); 3805 for (i = 0; i < 78; i++) err.print_raw("="); 3806 err.cr(); 3807 err.print_raw_cr(title); 3808 for (i = 0; i < 78; i++) err.print_raw("-"); 3809 err.cr(); 3810 err.print_raw_cr(message); 3811 for (i = 0; i < 78; i++) err.print_raw("="); 3812 err.cr(); 3813 3814 char buf[16]; 3815 // Prevent process from exiting upon "read error" without consuming all CPU 3816 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3817 3818 return buf[0] == 'y' || buf[0] == 'Y'; 3819} 3820 3821int os::stat(const char *path, struct stat *sbuf) { 3822 char pathbuf[MAX_PATH]; 3823 if (strlen(path) > MAX_PATH - 1) { 3824 errno = ENAMETOOLONG; 3825 return -1; 3826 } 3827 os::native_path(strcpy(pathbuf, path)); 3828 return ::stat(pathbuf, sbuf); 3829} 3830 3831bool os::check_heap(bool force) { 3832 return true; 3833} 3834 3835int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3836 return ::vsnprintf(buf, count, format, args); 3837} 3838 3839// Is a (classpath) directory empty? 3840bool os::dir_is_empty(const char* path) { 3841 DIR *dir = NULL; 3842 struct dirent *ptr; 3843 3844 dir = opendir(path); 3845 if (dir == NULL) return true; 3846 3847 /* Scan the directory */ 3848 bool result = true; 3849 char buf[sizeof(struct dirent) + MAX_PATH]; 3850 while (result && (ptr = ::readdir(dir)) != NULL) { 3851 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3852 result = false; 3853 } 3854 } 3855 closedir(dir); 3856 return result; 3857} 3858 3859// This code originates from JDK's sysOpen and open64_w 3860// from src/solaris/hpi/src/system_md.c 3861 3862#ifndef O_DELETE 3863#define O_DELETE 0x10000 3864#endif 3865 3866// Open a file. Unlink the file immediately after open returns 3867// if the specified oflag has the O_DELETE flag set. 3868// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3869 3870int os::open(const char *path, int oflag, int mode) { 3871 3872 if (strlen(path) > MAX_PATH - 1) { 3873 errno = ENAMETOOLONG; 3874 return -1; 3875 } 3876 int fd; 3877 int o_delete = (oflag & O_DELETE); 3878 oflag = oflag & ~O_DELETE; 3879 3880 fd = ::open(path, oflag, mode); 3881 if (fd == -1) return -1; 3882 3883 //If the open succeeded, the file might still be a directory 3884 { 3885 struct stat buf; 3886 int ret = ::fstat(fd, &buf); 3887 int st_mode = buf.st_mode; 3888 3889 if (ret != -1) { 3890 if ((st_mode & S_IFMT) == S_IFDIR) { 3891 errno = EISDIR; 3892 ::close(fd); 3893 return -1; 3894 } 3895 } else { 3896 ::close(fd); 3897 return -1; 3898 } 3899 } 3900 3901 /* 3902 * All file descriptors that are opened in the JVM and not 3903 * specifically destined for a subprocess should have the 3904 * close-on-exec flag set. If we don't set it, then careless 3rd 3905 * party native code might fork and exec without closing all 3906 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3907 * UNIXProcess.c), and this in turn might: 3908 * 3909 * - cause end-of-file to fail to be detected on some file 3910 * descriptors, resulting in mysterious hangs, or 3911 * 3912 * - might cause an fopen in the subprocess to fail on a system 3913 * suffering from bug 1085341. 3914 * 3915 * (Yes, the default setting of the close-on-exec flag is a Unix 3916 * design flaw) 3917 * 3918 * See: 3919 * 1085341: 32-bit stdio routines should support file descriptors >255 3920 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3921 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3922 */ 3923#ifdef FD_CLOEXEC 3924 { 3925 int flags = ::fcntl(fd, F_GETFD); 3926 if (flags != -1) 3927 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3928 } 3929#endif 3930 3931 if (o_delete != 0) { 3932 ::unlink(path); 3933 } 3934 return fd; 3935} 3936 3937 3938// create binary file, rewriting existing file if required 3939int os::create_binary_file(const char* path, bool rewrite_existing) { 3940 int oflags = O_WRONLY | O_CREAT; 3941 if (!rewrite_existing) { 3942 oflags |= O_EXCL; 3943 } 3944 return ::open(path, oflags, S_IREAD | S_IWRITE); 3945} 3946 3947// return current position of file pointer 3948jlong os::current_file_offset(int fd) { 3949 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 3950} 3951 3952// move file pointer to the specified offset 3953jlong os::seek_to_file_offset(int fd, jlong offset) { 3954 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 3955} 3956 3957// This code originates from JDK's sysAvailable 3958// from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3959 3960int os::available(int fd, jlong *bytes) { 3961 jlong cur, end; 3962 int mode; 3963 struct stat buf; 3964 3965 if (::fstat(fd, &buf) >= 0) { 3966 mode = buf.st_mode; 3967 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3968 /* 3969 * XXX: is the following call interruptible? If so, this might 3970 * need to go through the INTERRUPT_IO() wrapper as for other 3971 * blocking, interruptible calls in this file. 3972 */ 3973 int n; 3974 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3975 *bytes = n; 3976 return 1; 3977 } 3978 } 3979 } 3980 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 3981 return 0; 3982 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 3983 return 0; 3984 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 3985 return 0; 3986 } 3987 *bytes = end - cur; 3988 return 1; 3989} 3990 3991int os::socket_available(int fd, jint *pbytes) { 3992 if (fd < 0) 3993 return OS_OK; 3994 3995 int ret; 3996 3997 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 3998 3999 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 4000 // is expected to return 0 on failure and 1 on success to the jdk. 4001 4002 return (ret == OS_ERR) ? 0 : 1; 4003} 4004 4005// Map a block of memory. 4006char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4007 char *addr, size_t bytes, bool read_only, 4008 bool allow_exec) { 4009 int prot; 4010 int flags; 4011 4012 if (read_only) { 4013 prot = PROT_READ; 4014 flags = MAP_SHARED; 4015 } else { 4016 prot = PROT_READ | PROT_WRITE; 4017 flags = MAP_PRIVATE; 4018 } 4019 4020 if (allow_exec) { 4021 prot |= PROT_EXEC; 4022 } 4023 4024 if (addr != NULL) { 4025 flags |= MAP_FIXED; 4026 } 4027 4028 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4029 fd, file_offset); 4030 if (mapped_address == MAP_FAILED) { 4031 return NULL; 4032 } 4033 return mapped_address; 4034} 4035 4036 4037// Remap a block of memory. 4038char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4039 char *addr, size_t bytes, bool read_only, 4040 bool allow_exec) { 4041 // same as map_memory() on this OS 4042 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4043 allow_exec); 4044} 4045 4046 4047// Unmap a block of memory. 4048bool os::pd_unmap_memory(char* addr, size_t bytes) { 4049 return munmap(addr, bytes) == 0; 4050} 4051 4052// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4053// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4054// of a thread. 4055// 4056// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4057// the fast estimate available on the platform. 4058 4059jlong os::current_thread_cpu_time() { 4060#ifdef __APPLE__ 4061 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 4062#else 4063 Unimplemented(); 4064 return 0; 4065#endif 4066} 4067 4068jlong os::thread_cpu_time(Thread* thread) { 4069#ifdef __APPLE__ 4070 return os::thread_cpu_time(thread, true /* user + sys */); 4071#else 4072 Unimplemented(); 4073 return 0; 4074#endif 4075} 4076 4077jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4078#ifdef __APPLE__ 4079 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4080#else 4081 Unimplemented(); 4082 return 0; 4083#endif 4084} 4085 4086jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4087#ifdef __APPLE__ 4088 struct thread_basic_info tinfo; 4089 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 4090 kern_return_t kr; 4091 thread_t mach_thread; 4092 4093 mach_thread = thread->osthread()->thread_id(); 4094 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 4095 if (kr != KERN_SUCCESS) 4096 return -1; 4097 4098 if (user_sys_cpu_time) { 4099 jlong nanos; 4100 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 4101 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 4102 return nanos; 4103 } else { 4104 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 4105 } 4106#else 4107 Unimplemented(); 4108 return 0; 4109#endif 4110} 4111 4112 4113void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4114 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4115 info_ptr->may_skip_backward = false; // elapsed time not wall time 4116 info_ptr->may_skip_forward = false; // elapsed time not wall time 4117 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4118} 4119 4120void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4121 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4122 info_ptr->may_skip_backward = false; // elapsed time not wall time 4123 info_ptr->may_skip_forward = false; // elapsed time not wall time 4124 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4125} 4126 4127bool os::is_thread_cpu_time_supported() { 4128#ifdef __APPLE__ 4129 return true; 4130#else 4131 return false; 4132#endif 4133} 4134 4135// System loadavg support. Returns -1 if load average cannot be obtained. 4136// Bsd doesn't yet have a (official) notion of processor sets, 4137// so just return the system wide load average. 4138int os::loadavg(double loadavg[], int nelem) { 4139 return ::getloadavg(loadavg, nelem); 4140} 4141 4142void os::pause() { 4143 char filename[MAX_PATH]; 4144 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4145 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4146 } else { 4147 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4148 } 4149 4150 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4151 if (fd != -1) { 4152 struct stat buf; 4153 ::close(fd); 4154 while (::stat(filename, &buf) == 0) { 4155 (void)::poll(NULL, 0, 100); 4156 } 4157 } else { 4158 jio_fprintf(stderr, 4159 "Could not open pause file '%s', continuing immediately.\n", filename); 4160 } 4161} 4162 4163 4164// Refer to the comments in os_solaris.cpp park-unpark. 4165// 4166// Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 4167// hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 4168// For specifics regarding the bug see GLIBC BUGID 261237 : 4169// http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 4170// Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 4171// will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4172// is used. (The simple C test-case provided in the GLIBC bug report manifests the 4173// hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4174// and monitorenter when we're using 1-0 locking. All those operations may result in 4175// calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4176// of libpthread avoids the problem, but isn't practical. 4177// 4178// Possible remedies: 4179// 4180// 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4181// This is palliative and probabilistic, however. If the thread is preempted 4182// between the call to compute_abstime() and pthread_cond_timedwait(), more 4183// than the minimum period may have passed, and the abstime may be stale (in the 4184// past) resultin in a hang. Using this technique reduces the odds of a hang 4185// but the JVM is still vulnerable, particularly on heavily loaded systems. 4186// 4187// 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4188// of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4189// NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4190// reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4191// thread. 4192// 4193// 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4194// that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4195// a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4196// This also works well. In fact it avoids kernel-level scalability impediments 4197// on certain platforms that don't handle lots of active pthread_cond_timedwait() 4198// timers in a graceful fashion. 4199// 4200// 4. When the abstime value is in the past it appears that control returns 4201// correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4202// Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4203// can avoid the problem by reinitializing the condvar -- by cond_destroy() 4204// followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4205// It may be possible to avoid reinitialization by checking the return 4206// value from pthread_cond_timedwait(). In addition to reinitializing the 4207// condvar we must establish the invariant that cond_signal() is only called 4208// within critical sections protected by the adjunct mutex. This prevents 4209// cond_signal() from "seeing" a condvar that's in the midst of being 4210// reinitialized or that is corrupt. Sadly, this invariant obviates the 4211// desirable signal-after-unlock optimization that avoids futile context switching. 4212// 4213// I'm also concerned that some versions of NTPL might allocate an auxilliary 4214// structure when a condvar is used or initialized. cond_destroy() would 4215// release the helper structure. Our reinitialize-after-timedwait fix 4216// put excessive stress on malloc/free and locks protecting the c-heap. 4217// 4218// We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4219// It may be possible to refine (4) by checking the kernel and NTPL verisons 4220// and only enabling the work-around for vulnerable environments. 4221 4222// utility to compute the abstime argument to timedwait: 4223// millis is the relative timeout time 4224// abstime will be the absolute timeout time 4225// TODO: replace compute_abstime() with unpackTime() 4226 4227static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4228 if (millis < 0) millis = 0; 4229 struct timeval now; 4230 int status = gettimeofday(&now, NULL); 4231 assert(status == 0, "gettimeofday"); 4232 jlong seconds = millis / 1000; 4233 millis %= 1000; 4234 if (seconds > 50000000) { // see man cond_timedwait(3T) 4235 seconds = 50000000; 4236 } 4237 abstime->tv_sec = now.tv_sec + seconds; 4238 long usec = now.tv_usec + millis * 1000; 4239 if (usec >= 1000000) { 4240 abstime->tv_sec += 1; 4241 usec -= 1000000; 4242 } 4243 abstime->tv_nsec = usec * 1000; 4244 return abstime; 4245} 4246 4247 4248// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4249// Conceptually TryPark() should be equivalent to park(0). 4250 4251int os::PlatformEvent::TryPark() { 4252 for (;;) { 4253 const int v = _Event ; 4254 guarantee ((v == 0) || (v == 1), "invariant") ; 4255 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4256 } 4257} 4258 4259void os::PlatformEvent::park() { // AKA "down()" 4260 // Invariant: Only the thread associated with the Event/PlatformEvent 4261 // may call park(). 4262 // TODO: assert that _Assoc != NULL or _Assoc == Self 4263 int v ; 4264 for (;;) { 4265 v = _Event ; 4266 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4267 } 4268 guarantee (v >= 0, "invariant") ; 4269 if (v == 0) { 4270 // Do this the hard way by blocking ... 4271 int status = pthread_mutex_lock(_mutex); 4272 assert_status(status == 0, status, "mutex_lock"); 4273 guarantee (_nParked == 0, "invariant") ; 4274 ++ _nParked ; 4275 while (_Event < 0) { 4276 status = pthread_cond_wait(_cond, _mutex); 4277 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4278 // Treat this the same as if the wait was interrupted 4279 if (status == ETIMEDOUT) { status = EINTR; } 4280 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4281 } 4282 -- _nParked ; 4283 4284 _Event = 0 ; 4285 status = pthread_mutex_unlock(_mutex); 4286 assert_status(status == 0, status, "mutex_unlock"); 4287 // Paranoia to ensure our locked and lock-free paths interact 4288 // correctly with each other. 4289 OrderAccess::fence(); 4290 } 4291 guarantee (_Event >= 0, "invariant") ; 4292} 4293 4294int os::PlatformEvent::park(jlong millis) { 4295 guarantee (_nParked == 0, "invariant") ; 4296 4297 int v ; 4298 for (;;) { 4299 v = _Event ; 4300 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4301 } 4302 guarantee (v >= 0, "invariant") ; 4303 if (v != 0) return OS_OK ; 4304 4305 // We do this the hard way, by blocking the thread. 4306 // Consider enforcing a minimum timeout value. 4307 struct timespec abst; 4308 compute_abstime(&abst, millis); 4309 4310 int ret = OS_TIMEOUT; 4311 int status = pthread_mutex_lock(_mutex); 4312 assert_status(status == 0, status, "mutex_lock"); 4313 guarantee (_nParked == 0, "invariant") ; 4314 ++_nParked ; 4315 4316 // Object.wait(timo) will return because of 4317 // (a) notification 4318 // (b) timeout 4319 // (c) thread.interrupt 4320 // 4321 // Thread.interrupt and object.notify{All} both call Event::set. 4322 // That is, we treat thread.interrupt as a special case of notification. 4323 // The underlying Solaris implementation, cond_timedwait, admits 4324 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4325 // JVM from making those visible to Java code. As such, we must 4326 // filter out spurious wakeups. We assume all ETIME returns are valid. 4327 // 4328 // TODO: properly differentiate simultaneous notify+interrupt. 4329 // In that case, we should propagate the notify to another waiter. 4330 4331 while (_Event < 0) { 4332 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4333 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4334 pthread_cond_destroy (_cond); 4335 pthread_cond_init (_cond, NULL) ; 4336 } 4337 assert_status(status == 0 || status == EINTR || 4338 status == ETIMEDOUT, 4339 status, "cond_timedwait"); 4340 if (!FilterSpuriousWakeups) break ; // previous semantics 4341 if (status == ETIMEDOUT) break ; 4342 // We consume and ignore EINTR and spurious wakeups. 4343 } 4344 --_nParked ; 4345 if (_Event >= 0) { 4346 ret = OS_OK; 4347 } 4348 _Event = 0 ; 4349 status = pthread_mutex_unlock(_mutex); 4350 assert_status(status == 0, status, "mutex_unlock"); 4351 assert (_nParked == 0, "invariant") ; 4352 // Paranoia to ensure our locked and lock-free paths interact 4353 // correctly with each other. 4354 OrderAccess::fence(); 4355 return ret; 4356} 4357 4358void os::PlatformEvent::unpark() { 4359 // Transitions for _Event: 4360 // 0 :=> 1 4361 // 1 :=> 1 4362 // -1 :=> either 0 or 1; must signal target thread 4363 // That is, we can safely transition _Event from -1 to either 4364 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4365 // unpark() calls. 4366 // See also: "Semaphores in Plan 9" by Mullender & Cox 4367 // 4368 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4369 // that it will take two back-to-back park() calls for the owning 4370 // thread to block. This has the benefit of forcing a spurious return 4371 // from the first park() call after an unpark() call which will help 4372 // shake out uses of park() and unpark() without condition variables. 4373 4374 if (Atomic::xchg(1, &_Event) >= 0) return; 4375 4376 // Wait for the thread associated with the event to vacate 4377 int status = pthread_mutex_lock(_mutex); 4378 assert_status(status == 0, status, "mutex_lock"); 4379 int AnyWaiters = _nParked; 4380 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4381 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4382 AnyWaiters = 0; 4383 pthread_cond_signal(_cond); 4384 } 4385 status = pthread_mutex_unlock(_mutex); 4386 assert_status(status == 0, status, "mutex_unlock"); 4387 if (AnyWaiters != 0) { 4388 status = pthread_cond_signal(_cond); 4389 assert_status(status == 0, status, "cond_signal"); 4390 } 4391 4392 // Note that we signal() _after dropping the lock for "immortal" Events. 4393 // This is safe and avoids a common class of futile wakeups. In rare 4394 // circumstances this can cause a thread to return prematurely from 4395 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4396 // simply re-test the condition and re-park itself. 4397} 4398 4399 4400// JSR166 4401// ------------------------------------------------------- 4402 4403/* 4404 * The solaris and bsd implementations of park/unpark are fairly 4405 * conservative for now, but can be improved. They currently use a 4406 * mutex/condvar pair, plus a a count. 4407 * Park decrements count if > 0, else does a condvar wait. Unpark 4408 * sets count to 1 and signals condvar. Only one thread ever waits 4409 * on the condvar. Contention seen when trying to park implies that someone 4410 * is unparking you, so don't wait. And spurious returns are fine, so there 4411 * is no need to track notifications. 4412 */ 4413 4414#define MAX_SECS 100000000 4415/* 4416 * This code is common to bsd and solaris and will be moved to a 4417 * common place in dolphin. 4418 * 4419 * The passed in time value is either a relative time in nanoseconds 4420 * or an absolute time in milliseconds. Either way it has to be unpacked 4421 * into suitable seconds and nanoseconds components and stored in the 4422 * given timespec structure. 4423 * Given time is a 64-bit value and the time_t used in the timespec is only 4424 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4425 * overflow if times way in the future are given. Further on Solaris versions 4426 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4427 * number of seconds, in abstime, is less than current_time + 100,000,000. 4428 * As it will be 28 years before "now + 100000000" will overflow we can 4429 * ignore overflow and just impose a hard-limit on seconds using the value 4430 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4431 * years from "now". 4432 */ 4433 4434static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4435 assert (time > 0, "convertTime"); 4436 4437 struct timeval now; 4438 int status = gettimeofday(&now, NULL); 4439 assert(status == 0, "gettimeofday"); 4440 4441 time_t max_secs = now.tv_sec + MAX_SECS; 4442 4443 if (isAbsolute) { 4444 jlong secs = time / 1000; 4445 if (secs > max_secs) { 4446 absTime->tv_sec = max_secs; 4447 } 4448 else { 4449 absTime->tv_sec = secs; 4450 } 4451 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4452 } 4453 else { 4454 jlong secs = time / NANOSECS_PER_SEC; 4455 if (secs >= MAX_SECS) { 4456 absTime->tv_sec = max_secs; 4457 absTime->tv_nsec = 0; 4458 } 4459 else { 4460 absTime->tv_sec = now.tv_sec + secs; 4461 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4462 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4463 absTime->tv_nsec -= NANOSECS_PER_SEC; 4464 ++absTime->tv_sec; // note: this must be <= max_secs 4465 } 4466 } 4467 } 4468 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4469 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4470 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4471 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4472} 4473 4474void Parker::park(bool isAbsolute, jlong time) { 4475 // Ideally we'd do something useful while spinning, such 4476 // as calling unpackTime(). 4477 4478 // Optional fast-path check: 4479 // Return immediately if a permit is available. 4480 // We depend on Atomic::xchg() having full barrier semantics 4481 // since we are doing a lock-free update to _counter. 4482 if (Atomic::xchg(0, &_counter) > 0) return; 4483 4484 Thread* thread = Thread::current(); 4485 assert(thread->is_Java_thread(), "Must be JavaThread"); 4486 JavaThread *jt = (JavaThread *)thread; 4487 4488 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4489 // Check interrupt before trying to wait 4490 if (Thread::is_interrupted(thread, false)) { 4491 return; 4492 } 4493 4494 // Next, demultiplex/decode time arguments 4495 struct timespec absTime; 4496 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4497 return; 4498 } 4499 if (time > 0) { 4500 unpackTime(&absTime, isAbsolute, time); 4501 } 4502 4503 4504 // Enter safepoint region 4505 // Beware of deadlocks such as 6317397. 4506 // The per-thread Parker:: mutex is a classic leaf-lock. 4507 // In particular a thread must never block on the Threads_lock while 4508 // holding the Parker:: mutex. If safepoints are pending both the 4509 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4510 ThreadBlockInVM tbivm(jt); 4511 4512 // Don't wait if cannot get lock since interference arises from 4513 // unblocking. Also. check interrupt before trying wait 4514 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4515 return; 4516 } 4517 4518 int status ; 4519 if (_counter > 0) { // no wait needed 4520 _counter = 0; 4521 status = pthread_mutex_unlock(_mutex); 4522 assert (status == 0, "invariant") ; 4523 // Paranoia to ensure our locked and lock-free paths interact 4524 // correctly with each other and Java-level accesses. 4525 OrderAccess::fence(); 4526 return; 4527 } 4528 4529#ifdef ASSERT 4530 // Don't catch signals while blocked; let the running threads have the signals. 4531 // (This allows a debugger to break into the running thread.) 4532 sigset_t oldsigs; 4533 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4534 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4535#endif 4536 4537 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4538 jt->set_suspend_equivalent(); 4539 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4540 4541 if (time == 0) { 4542 status = pthread_cond_wait (_cond, _mutex) ; 4543 } else { 4544 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4545 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4546 pthread_cond_destroy (_cond) ; 4547 pthread_cond_init (_cond, NULL); 4548 } 4549 } 4550 assert_status(status == 0 || status == EINTR || 4551 status == ETIMEDOUT, 4552 status, "cond_timedwait"); 4553 4554#ifdef ASSERT 4555 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4556#endif 4557 4558 _counter = 0 ; 4559 status = pthread_mutex_unlock(_mutex) ; 4560 assert_status(status == 0, status, "invariant") ; 4561 // Paranoia to ensure our locked and lock-free paths interact 4562 // correctly with each other and Java-level accesses. 4563 OrderAccess::fence(); 4564 4565 // If externally suspended while waiting, re-suspend 4566 if (jt->handle_special_suspend_equivalent_condition()) { 4567 jt->java_suspend_self(); 4568 } 4569} 4570 4571void Parker::unpark() { 4572 int s, status ; 4573 status = pthread_mutex_lock(_mutex); 4574 assert (status == 0, "invariant") ; 4575 s = _counter; 4576 _counter = 1; 4577 if (s < 1) { 4578 if (WorkAroundNPTLTimedWaitHang) { 4579 status = pthread_cond_signal (_cond) ; 4580 assert (status == 0, "invariant") ; 4581 status = pthread_mutex_unlock(_mutex); 4582 assert (status == 0, "invariant") ; 4583 } else { 4584 status = pthread_mutex_unlock(_mutex); 4585 assert (status == 0, "invariant") ; 4586 status = pthread_cond_signal (_cond) ; 4587 assert (status == 0, "invariant") ; 4588 } 4589 } else { 4590 pthread_mutex_unlock(_mutex); 4591 assert (status == 0, "invariant") ; 4592 } 4593} 4594 4595 4596/* Darwin has no "environ" in a dynamic library. */ 4597#ifdef __APPLE__ 4598#include <crt_externs.h> 4599#define environ (*_NSGetEnviron()) 4600#else 4601extern char** environ; 4602#endif 4603 4604// Run the specified command in a separate process. Return its exit value, 4605// or -1 on failure (e.g. can't fork a new process). 4606// Unlike system(), this function can be called from signal handler. It 4607// doesn't block SIGINT et al. 4608int os::fork_and_exec(char* cmd) { 4609 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4610 4611 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4612 // pthread_atfork handlers and reset pthread library. All we need is a 4613 // separate process to execve. Make a direct syscall to fork process. 4614 // On IA64 there's no fork syscall, we have to use fork() and hope for 4615 // the best... 4616 pid_t pid = fork(); 4617 4618 if (pid < 0) { 4619 // fork failed 4620 return -1; 4621 4622 } else if (pid == 0) { 4623 // child process 4624 4625 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4626 // first to kill every thread on the thread list. Because this list is 4627 // not reset by fork() (see notes above), execve() will instead kill 4628 // every thread in the parent process. We know this is the only thread 4629 // in the new process, so make a system call directly. 4630 // IA64 should use normal execve() from glibc to match the glibc fork() 4631 // above. 4632 execve("/bin/sh", (char* const*)argv, environ); 4633 4634 // execve failed 4635 _exit(-1); 4636 4637 } else { 4638 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4639 // care about the actual exit code, for now. 4640 4641 int status; 4642 4643 // Wait for the child process to exit. This returns immediately if 4644 // the child has already exited. */ 4645 while (waitpid(pid, &status, 0) < 0) { 4646 switch (errno) { 4647 case ECHILD: return 0; 4648 case EINTR: break; 4649 default: return -1; 4650 } 4651 } 4652 4653 if (WIFEXITED(status)) { 4654 // The child exited normally; get its exit code. 4655 return WEXITSTATUS(status); 4656 } else if (WIFSIGNALED(status)) { 4657 // The child exited because of a signal 4658 // The best value to return is 0x80 + signal number, 4659 // because that is what all Unix shells do, and because 4660 // it allows callers to distinguish between process exit and 4661 // process death by signal. 4662 return 0x80 + WTERMSIG(status); 4663 } else { 4664 // Unknown exit code; pass it through 4665 return status; 4666 } 4667 } 4668} 4669 4670// is_headless_jre() 4671// 4672// Test for the existence of xawt/libmawt.so or libawt_xawt.so 4673// in order to report if we are running in a headless jre 4674// 4675// Since JDK8 xawt/libmawt.so was moved into the same directory 4676// as libawt.so, and renamed libawt_xawt.so 4677// 4678bool os::is_headless_jre() { 4679 struct stat statbuf; 4680 char buf[MAXPATHLEN]; 4681 char libmawtpath[MAXPATHLEN]; 4682 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4683 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4684 char *p; 4685 4686 // Get path to libjvm.so 4687 os::jvm_path(buf, sizeof(buf)); 4688 4689 // Get rid of libjvm.so 4690 p = strrchr(buf, '/'); 4691 if (p == NULL) return false; 4692 else *p = '\0'; 4693 4694 // Get rid of client or server 4695 p = strrchr(buf, '/'); 4696 if (p == NULL) return false; 4697 else *p = '\0'; 4698 4699 // check xawt/libmawt.so 4700 strcpy(libmawtpath, buf); 4701 strcat(libmawtpath, xawtstr); 4702 if (::stat(libmawtpath, &statbuf) == 0) return false; 4703 4704 // check libawt_xawt.so 4705 strcpy(libmawtpath, buf); 4706 strcat(libmawtpath, new_xawtstr); 4707 if (::stat(libmawtpath, &statbuf) == 0) return false; 4708 4709 return true; 4710} 4711 4712// Get the default path to the core file 4713// Returns the length of the string 4714int os::get_core_path(char* buffer, size_t bufferSize) { 4715 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4716 4717 // Truncate if theoretical string was longer than bufferSize 4718 n = MIN2(n, (int)bufferSize); 4719 4720 return n; 4721} 4722 4723