os_bsd.cpp revision 5619:3b32d287da89
1179055Sjfv/* 2171384Sjfv * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3247822Sjfv * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4171384Sjfv * 5171384Sjfv * This code is free software; you can redistribute it and/or modify it 6171384Sjfv * under the terms of the GNU General Public License version 2 only, as 7171384Sjfv * published by the Free Software Foundation. 8171384Sjfv * 9171384Sjfv * This code is distributed in the hope that it will be useful, but WITHOUT 10171384Sjfv * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11171384Sjfv * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12171384Sjfv * version 2 for more details (a copy is included in the LICENSE file that 13171384Sjfv * accompanied this code). 14171384Sjfv * 15171384Sjfv * You should have received a copy of the GNU General Public License version 16171384Sjfv * 2 along with this work; if not, write to the Free Software Foundation, 17171384Sjfv * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18171384Sjfv * 19171384Sjfv * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20171384Sjfv * or visit www.oracle.com if you need additional information or have any 21171384Sjfv * questions. 22171384Sjfv * 23171384Sjfv */ 24171384Sjfv 25171384Sjfv// no precompiled headers 26171384Sjfv#include "classfile/classLoader.hpp" 27171384Sjfv#include "classfile/systemDictionary.hpp" 28171384Sjfv#include "classfile/vmSymbols.hpp" 29171384Sjfv#include "code/icBuffer.hpp" 30171384Sjfv#include "code/vtableStubs.hpp" 31171384Sjfv#include "compiler/compileBroker.hpp" 32179055Sjfv#include "compiler/disassembler.hpp" 33179055Sjfv#include "interpreter/interpreter.hpp" 34171384Sjfv#include "jvm_bsd.h" 35171384Sjfv#include "memory/allocation.inline.hpp" 36171384Sjfv#include "memory/filemap.hpp" 37171384Sjfv#include "mutex_bsd.inline.hpp" 38251964Sjfv#include "oops/oop.inline.hpp" 39251964Sjfv#include "os_share_bsd.hpp" 40251964Sjfv#include "prims/jniFastGetField.hpp" 41251964Sjfv#include "prims/jvm.h" 42251964Sjfv#include "prims/jvm_misc.hpp" 43251964Sjfv#include "runtime/arguments.hpp" 44251964Sjfv#include "runtime/extendedPC.hpp" 45251964Sjfv#include "runtime/globals.hpp" 46251964Sjfv#include "runtime/interfaceSupport.hpp" 47251964Sjfv#include "runtime/java.hpp" 48251964Sjfv#include "runtime/javaCalls.hpp" 49251964Sjfv#include "runtime/mutexLocker.hpp" 50251964Sjfv#include "runtime/objectMonitor.hpp" 51251964Sjfv#include "runtime/osThread.hpp" 52251964Sjfv#include "runtime/perfMemory.hpp" 53251964Sjfv#include "runtime/sharedRuntime.hpp" 54251964Sjfv#include "runtime/statSampler.hpp" 55251964Sjfv#include "runtime/stubRoutines.hpp" 56251964Sjfv#include "runtime/thread.inline.hpp" 57251964Sjfv#include "runtime/threadCritical.hpp" 58251964Sjfv#include "runtime/timer.hpp" 59251964Sjfv#include "services/attachListener.hpp" 60251964Sjfv#include "services/memTracker.hpp" 61251964Sjfv#include "services/runtimeService.hpp" 62251964Sjfv#include "utilities/decoder.hpp" 63251964Sjfv#include "utilities/defaultStream.hpp" 64251964Sjfv#include "utilities/events.hpp" 65251964Sjfv#include "utilities/growableArray.hpp" 66251964Sjfv#include "utilities/vmError.hpp" 67251964Sjfv 68251964Sjfv// put OS-includes here 69251964Sjfv# include <sys/types.h> 70251964Sjfv# include <sys/mman.h> 71251964Sjfv# include <sys/stat.h> 72251964Sjfv# include <sys/select.h> 73251964Sjfv# include <pthread.h> 74251964Sjfv# include <signal.h> 75251964Sjfv# include <errno.h> 76171384Sjfv# include <dlfcn.h> 77171384Sjfv# include <stdio.h> 78194875Sjfv# include <unistd.h> 79251964Sjfv# include <sys/resource.h> 80251964Sjfv# include <pthread.h> 81251964Sjfv# include <sys/stat.h> 82171384Sjfv# include <sys/time.h> 83230775Sjfv# include <sys/times.h> 84230775Sjfv# include <sys/utsname.h> 85230775Sjfv# include <sys/socket.h> 86230775Sjfv# include <sys/wait.h> 87230775Sjfv# include <time.h> 88230775Sjfv# include <pwd.h> 89230775Sjfv# include <poll.h> 90230775Sjfv# include <semaphore.h> 91230775Sjfv# include <fcntl.h> 92230775Sjfv# include <string.h> 93230775Sjfv# include <sys/param.h> 94230775Sjfv# include <sys/sysctl.h> 95230775Sjfv# include <sys/ipc.h> 96230775Sjfv# include <sys/shm.h> 97230775Sjfv#ifndef __APPLE__ 98230775Sjfv# include <link.h> 99230775Sjfv#endif 100230775Sjfv# include <stdint.h> 101230775Sjfv# include <inttypes.h> 102230775Sjfv# include <sys/ioctl.h> 103247822Sjfv# include <sys/syscall.h> 104230775Sjfv 105247822Sjfv#if defined(__FreeBSD__) || defined(__NetBSD__) 106251964Sjfv# include <elf.h> 107251964Sjfv#endif 108230775Sjfv 109230775Sjfv#ifdef __APPLE__ 110230775Sjfv# include <mach/mach.h> // semaphore_* API 111238149Sjfv# include <mach-o/dyld.h> 112247822Sjfv# include <sys/proc_info.h> 113230775Sjfv# include <objc/objc-auto.h> 114251964Sjfv#endif 115230775Sjfv 116230775Sjfv#ifndef MAP_ANONYMOUS 117230775Sjfv#define MAP_ANONYMOUS MAP_ANON 118247822Sjfv#endif 119247822Sjfv 120247822Sjfv#define MAX_PATH (2 * K) 121230775Sjfv 122247822Sjfv// for timer info max values which include all bits 123247822Sjfv#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 124171384Sjfv 125171384Sjfv#define LARGEPAGES_BIT (1 << 6) 126230775Sjfv//////////////////////////////////////////////////////////////////////////////// 127230775Sjfv// global variables 128230775Sjfvjulong os::Bsd::_physical_memory = 0; 129230775Sjfv 130230775Sjfv 131230775Sjfvint (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; 132230775Sjfvpthread_t os::Bsd::_main_thread; 133230775Sjfvint os::Bsd::_page_size = -1; 134230775Sjfv 135230775Sjfvstatic jlong initial_time_count=0; 136230775Sjfv 137230775Sjfvstatic int clock_tics_per_sec = 100; 138230775Sjfv 139230775Sjfv// For diagnostics to print a message once. see run_periodic_checks 140230775Sjfvstatic sigset_t check_signal_done; 141230775Sjfvstatic bool check_signals = true; 142171384Sjfv 143171384Sjfvstatic pid_t _initial_pid = 0; 144230775Sjfv 145230775Sjfv/* Signal number used to suspend/resume a thread */ 146230775Sjfv 147230775Sjfv/* do not use any signal number less than SIGSEGV, see 4355769 */ 148230775Sjfvstatic int SR_signum = SIGUSR2; 149230775Sjfvsigset_t SR_sigset; 150230775Sjfv 151230775Sjfv 152230775Sjfv//////////////////////////////////////////////////////////////////////////////// 153230775Sjfv// utility functions 154230775Sjfv 155230775Sjfvstatic int SR_initialize(); 156230775Sjfvstatic void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 157171384Sjfv 158190873Sjfvjulong os::available_memory() { 159230775Sjfv return Bsd::available_memory(); 160230775Sjfv} 161190873Sjfv 162230775Sjfv// available here means free 163230775Sjfvjulong os::Bsd::available_memory() { 164190873Sjfv uint64_t available = physical_memory() >> 2; 165190873Sjfv#ifdef __APPLE__ 166230775Sjfv mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; 167230775Sjfv vm_statistics64_data_t vmstat; 168230775Sjfv kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, 169230775Sjfv (host_info64_t)&vmstat, &count); 170238149Sjfv assert(kerr == KERN_SUCCESS, 171190873Sjfv "host_statistics64 failed - check mach_host_self() and count"); 172238149Sjfv if (kerr == KERN_SUCCESS) { 173171384Sjfv available = vmstat.free_count * os::vm_page_size(); 174230775Sjfv } 175230775Sjfv#endif 176230775Sjfv return available; 177230775Sjfv} 178230775Sjfv 179230775Sjfvjulong os::physical_memory() { 180230775Sjfv return Bsd::physical_memory(); 181230775Sjfv} 182230775Sjfv 183230775Sjfv//////////////////////////////////////////////////////////////////////////////// 184190873Sjfv// environment support 185190873Sjfv 186190873Sjfvbool os::getenv(const char* name, char* buf, int len) { 187190873Sjfv const char* val = ::getenv(name); 188190873Sjfv if (val != NULL && strlen(val) < (size_t)len) { 189230775Sjfv strcpy(buf, val); 190230775Sjfv return true; 191230775Sjfv } 192230775Sjfv if (len > 0) buf[0] = 0; // return a null string 193230775Sjfv return false; 194230775Sjfv} 195230775Sjfv 196230775Sjfv 197230775Sjfv// Return true if user is running as root. 198230775Sjfv 199230775Sjfvbool os::have_special_privileges() { 200230775Sjfv static bool init = false; 201230775Sjfv static bool privileges = false; 202230775Sjfv if (!init) { 203230775Sjfv privileges = (getuid() != geteuid()) || (getgid() != getegid()); 204230775Sjfv init = true; 205171384Sjfv } 206171384Sjfv return privileges; 207230775Sjfv} 208230775Sjfv 209230775Sjfv 210230775Sjfv 211230775Sjfv// Cpu architecture string 212230775Sjfv#if defined(ZERO) 213230775Sjfvstatic char cpu_arch[] = ZERO_LIBARCH; 214230775Sjfv#elif defined(IA64) 215230775Sjfvstatic char cpu_arch[] = "ia64"; 216230775Sjfv#elif defined(IA32) 217230775Sjfvstatic char cpu_arch[] = "i386"; 218230775Sjfv#elif defined(AMD64) 219230775Sjfvstatic char cpu_arch[] = "amd64"; 220171384Sjfv#elif defined(ARM) 221171384Sjfvstatic char cpu_arch[] = "arm"; 222230775Sjfv#elif defined(PPC) 223230775Sjfvstatic char cpu_arch[] = "ppc"; 224230775Sjfv#elif defined(SPARC) 225230775Sjfv# ifdef _LP64 226230775Sjfvstatic char cpu_arch[] = "sparcv9"; 227230775Sjfv# else 228230775Sjfvstatic char cpu_arch[] = "sparc"; 229230775Sjfv# endif 230230775Sjfv#else 231230775Sjfv#error Add appropriate cpu_arch setting 232230775Sjfv#endif 233230775Sjfv 234230775Sjfv// Compiler variant 235230775Sjfv#ifdef COMPILER2 236230775Sjfv#define COMPILER_VARIANT "server" 237230775Sjfv#else 238230775Sjfv#define COMPILER_VARIANT "client" 239230775Sjfv#endif 240179055Sjfv 241179055Sjfv 242179055Sjfvvoid os::Bsd::initialize_system_info() { 243179055Sjfv int mib[2]; 244179055Sjfv size_t len; 245179055Sjfv int cpu_val; 246230775Sjfv julong mem_val; 247230775Sjfv 248230775Sjfv /* get processors count via hw.ncpus sysctl */ 249179055Sjfv mib[0] = CTL_HW; 250179055Sjfv mib[1] = HW_NCPU; 251179055Sjfv len = sizeof(cpu_val); 252179055Sjfv if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { 253179055Sjfv assert(len == sizeof(cpu_val), "unexpected data size"); 254179055Sjfv set_processor_count(cpu_val); 255230775Sjfv } 256230775Sjfv else { 257230775Sjfv set_processor_count(1); // fallback 258230775Sjfv } 259230775Sjfv 260230775Sjfv /* get physical memory via hw.memsize sysctl (hw.memsize is used 261230775Sjfv * since it returns a 64 bit value) 262230775Sjfv */ 263230775Sjfv mib[0] = CTL_HW; 264251964Sjfv 265171384Sjfv#if defined (HW_MEMSIZE) // Apple 266171384Sjfv mib[1] = HW_MEMSIZE; 267230775Sjfv#elif defined(HW_PHYSMEM) // Most of BSD 268230775Sjfv mib[1] = HW_PHYSMEM; 269230775Sjfv#elif defined(HW_REALMEM) // Old FreeBSD 270230775Sjfv mib[1] = HW_REALMEM; 271230775Sjfv#else 272205720Sjfv #error No ways to get physmem 273179055Sjfv#endif 274230775Sjfv 275230775Sjfv len = sizeof(mem_val); 276230775Sjfv if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { 277230775Sjfv assert(len == sizeof(mem_val), "unexpected data size"); 278230775Sjfv _physical_memory = mem_val; 279230775Sjfv } else { 280230775Sjfv _physical_memory = 256*1024*1024; // fallback (XXXBSD?) 281179055Sjfv } 282230775Sjfv 283230775Sjfv#ifdef __OpenBSD__ 284179055Sjfv { 285230775Sjfv // limit _physical_memory memory view on OpenBSD since 286179055Sjfv // datasize rlimit restricts us anyway. 287230775Sjfv struct rlimit limits; 288230775Sjfv getrlimit(RLIMIT_DATA, &limits); 289230775Sjfv _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); 290230775Sjfv } 291230775Sjfv#endif 292230775Sjfv} 293230775Sjfv 294230775Sjfv#ifdef __APPLE__ 295230775Sjfvstatic const char *get_home() { 296230775Sjfv const char *home_dir = ::getenv("HOME"); 297230775Sjfv if ((home_dir == NULL) || (*home_dir == '\0')) { 298230775Sjfv struct passwd *passwd_info = getpwuid(geteuid()); 299230775Sjfv if (passwd_info != NULL) { 300230775Sjfv home_dir = passwd_info->pw_dir; 301230775Sjfv } 302230775Sjfv } 303230775Sjfv 304230775Sjfv return home_dir; 305230775Sjfv} 306230775Sjfv#endif 307230775Sjfv 308230775Sjfvvoid os::init_system_properties_values() { 309230775Sjfv// char arch[12]; 310230775Sjfv// sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 311230775Sjfv 312230775Sjfv // The next steps are taken in the product version: 313230775Sjfv // 314230775Sjfv // Obtain the JAVA_HOME value from the location of libjvm.so. 315230775Sjfv // This library should be located at: 316230775Sjfv // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 317230775Sjfv // 318230775Sjfv // If "/jre/lib/" appears at the right place in the path, then we 319230775Sjfv // assume libjvm.so is installed in a JDK and we use this path. 320230775Sjfv // 321230775Sjfv // Otherwise exit with message: "Could not create the Java virtual machine." 322230775Sjfv // 323230775Sjfv // The following extra steps are taken in the debugging version: 324230775Sjfv // 325230775Sjfv // If "/jre/lib/" does NOT appear at the right place in the path 326230775Sjfv // instead of exit check for $JAVA_HOME environment variable. 327230775Sjfv // 328230775Sjfv // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 329171384Sjfv // then we append a fake suffix "hotspot/libjvm.so" to this path so 330247822Sjfv // it looks like libjvm.so is installed there 331190873Sjfv // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 332230775Sjfv // 333230775Sjfv // Otherwise exit. 334230775Sjfv // 335230775Sjfv // Important note: if the location of libjvm.so changes this 336230775Sjfv // code needs to be changed accordingly. 337230775Sjfv 338230775Sjfv // The next few definitions allow the code to be verbatim: 339230775Sjfv#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 340230775Sjfv#define getenv(n) ::getenv(n) 341179055Sjfv 342190873Sjfv/* 343230775Sjfv * See ld(1): 344230775Sjfv * The linker uses the following search paths to locate required 345230775Sjfv * shared libraries: 346230775Sjfv * 1: ... 347230775Sjfv * ... 348230775Sjfv * 7: The default directories, normally /lib and /usr/lib. 349190873Sjfv */ 350190873Sjfv#ifndef DEFAULT_LIBPATH 351190873Sjfv#define DEFAULT_LIBPATH "/lib:/usr/lib" 352230775Sjfv#endif 353230775Sjfv 354230775Sjfv#define EXTENSIONS_DIR "/lib/ext" 355230775Sjfv#define ENDORSED_DIR "/lib/endorsed" 356230775Sjfv#define REG_DIR "/usr/java/packages" 357230775Sjfv 358190873Sjfv#ifdef __APPLE__ 359171384Sjfv#define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" 360230775Sjfv#define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" 361230775Sjfv const char *user_home_dir = get_home(); 362230775Sjfv // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir 363230775Sjfv int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + 364230775Sjfv sizeof(SYS_EXTENSIONS_DIRS); 365230775Sjfv#endif 366230775Sjfv 367230775Sjfv { 368230775Sjfv /* sysclasspath, java_home, dll_dir */ 369179055Sjfv { 370230775Sjfv char *home_path; 371230775Sjfv char *dll_path; 372230775Sjfv char *pslash; 373230775Sjfv char buf[MAXPATHLEN]; 374230775Sjfv os::jvm_path(buf, sizeof(buf)); 375230775Sjfv 376230775Sjfv // Found the full path to libjvm.so. 377230775Sjfv // Now cut the path to <java_home>/jre if we can. 378190873Sjfv *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 379230775Sjfv pslash = strrchr(buf, '/'); 380230775Sjfv if (pslash != NULL) 381230775Sjfv *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 382230775Sjfv dll_path = malloc(strlen(buf) + 1); 383194875Sjfv if (dll_path == NULL) 384230775Sjfv return; 385215911Sjfv strcpy(dll_path, buf); 386215911Sjfv Arguments::set_dll_dir(dll_path); 387230775Sjfv 388230775Sjfv if (pslash != NULL) { 389230775Sjfv pslash = strrchr(buf, '/'); 390230775Sjfv if (pslash != NULL) { 391230775Sjfv *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ 392230775Sjfv#ifndef __APPLE__ 393190873Sjfv pslash = strrchr(buf, '/'); 394230775Sjfv if (pslash != NULL) 395230775Sjfv *pslash = '\0'; /* get rid of /lib */ 396230775Sjfv#endif 397230775Sjfv } 398230775Sjfv } 399230775Sjfv 400171384Sjfv home_path = malloc(strlen(buf) + 1); 401171384Sjfv if (home_path == NULL) 402230775Sjfv return; 403230775Sjfv strcpy(home_path, buf); 404230775Sjfv Arguments::set_java_home(home_path); 405230775Sjfv 406230775Sjfv if (!set_boot_path('/', ':')) 407230775Sjfv return; 408185352Sjfv } 409230775Sjfv 410230775Sjfv /* 411247822Sjfv * Where to look for native libraries 412230775Sjfv * 413230775Sjfv * Note: Due to a legacy implementation, most of the library path 414230775Sjfv * is set in the launcher. This was to accomodate linking restrictions 415171384Sjfv * on legacy Bsd implementations (which are no longer supported). 416247822Sjfv * Eventually, all the library path setting will be done here. 417230775Sjfv * 418247822Sjfv * However, to prevent the proliferation of improperly built native 419247822Sjfv * libraries, the new path component /usr/java/packages is added here. 420247822Sjfv * Eventually, all the library path setting will be done here. 421230775Sjfv */ 422185352Sjfv { 423185352Sjfv char *ld_library_path; 424230775Sjfv 425230775Sjfv /* 426230775Sjfv * Construct the invariant part of ld_library_path. Note that the 427185352Sjfv * space for the colon and the trailing null are provided by the 428185352Sjfv * nulls included by the sizeof operator (so actually we allocate 429185352Sjfv * a byte more than necessary). 430230775Sjfv */ 431230775Sjfv#ifdef __APPLE__ 432230775Sjfv ld_library_path = (char *) malloc(system_ext_size); 433185352Sjfv sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); 434185352Sjfv#else 435230775Sjfv ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + 436230775Sjfv strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); 437230775Sjfv sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); 438230775Sjfv#endif 439230775Sjfv 440230775Sjfv /* 441230775Sjfv * Get the user setting of LD_LIBRARY_PATH, and prepended it. It 442230775Sjfv * should always exist (until the legacy problem cited above is 443230775Sjfv * addressed). 444185352Sjfv */ 445230775Sjfv#ifdef __APPLE__ 446230775Sjfv // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper 447230775Sjfv char *l = getenv("JAVA_LIBRARY_PATH"); 448230775Sjfv if (l != NULL) { 449230775Sjfv char *t = ld_library_path; 450230775Sjfv /* That's +1 for the colon and +1 for the trailing '\0' */ 451230775Sjfv ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); 452247822Sjfv sprintf(ld_library_path, "%s:%s", l, t); 453230775Sjfv free(t); 454230775Sjfv } 455247822Sjfv 456247822Sjfv char *v = getenv("DYLD_LIBRARY_PATH"); 457230775Sjfv#else 458185352Sjfv char *v = getenv("LD_LIBRARY_PATH"); 459185352Sjfv#endif 460230775Sjfv if (v != NULL) { 461230775Sjfv char *t = ld_library_path; 462230775Sjfv /* That's +1 for the colon and +1 for the trailing '\0' */ 463230775Sjfv ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); 464230775Sjfv sprintf(ld_library_path, "%s:%s", v, t); 465230775Sjfv free(t); 466230775Sjfv } 467230775Sjfv 468230775Sjfv#ifdef __APPLE__ 469230775Sjfv // Apple's Java6 has "." at the beginning of java.library.path. 470230775Sjfv // OpenJDK on Windows has "." at the end of java.library.path. 471230775Sjfv // OpenJDK on Linux and Solaris don't have "." in java.library.path 472230775Sjfv // at all. To ease the transition from Apple's Java6 to OpenJDK7, 473230775Sjfv // "." is appended to the end of java.library.path. Yes, this 474230775Sjfv // could cause a change in behavior, but Apple's Java6 behavior 475230775Sjfv // can be achieved by putting "." at the beginning of the 476185352Sjfv // JAVA_LIBRARY_PATH environment variable. 477230775Sjfv { 478185352Sjfv char *t = ld_library_path; 479185352Sjfv // that's +3 for appending ":." and the trailing '\0' 480230775Sjfv ld_library_path = (char *) malloc(strlen(t) + 3); 481230775Sjfv sprintf(ld_library_path, "%s:%s", t, "."); 482230775Sjfv free(t); 483230775Sjfv } 484230775Sjfv#endif 485230775Sjfv 486230775Sjfv Arguments::set_library_path(ld_library_path); 487230775Sjfv } 488230775Sjfv 489230775Sjfv /* 490230775Sjfv * Extensions directories. 491171384Sjfv * 492179055Sjfv * Note that the space for the colon and the trailing null are provided 493251964Sjfv * by the nulls included by the sizeof operator (so actually one byte more 494190873Sjfv * than necessary is allocated). 495230775Sjfv */ 496230775Sjfv { 497230775Sjfv#ifdef __APPLE__ 498230775Sjfv char *buf = malloc(strlen(Arguments::get_java_home()) + 499230775Sjfv sizeof(EXTENSIONS_DIR) + system_ext_size); 500230775Sjfv sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" 501179055Sjfv SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); 502190873Sjfv#else 503230775Sjfv char *buf = malloc(strlen(Arguments::get_java_home()) + 504230775Sjfv sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); 505230775Sjfv sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, 506190873Sjfv Arguments::get_java_home()); 507230775Sjfv#endif 508230775Sjfv 509190873Sjfv Arguments::set_ext_dirs(buf); 510230775Sjfv } 511230775Sjfv 512190873Sjfv /* Endorsed standards default directory. */ 513230775Sjfv { 514230775Sjfv char * buf; 515190873Sjfv buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 516190873Sjfv sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 517230775Sjfv Arguments::set_endorsed_dirs(buf); 518230775Sjfv } 519230775Sjfv } 520230775Sjfv 521230775Sjfv#ifdef __APPLE__ 522230775Sjfv#undef SYS_EXTENSIONS_DIR 523230775Sjfv#endif 524230775Sjfv#undef malloc 525230775Sjfv#undef getenv 526230775Sjfv#undef EXTENSIONS_DIR 527230775Sjfv#undef ENDORSED_DIR 528230775Sjfv 529230775Sjfv // Done 530230775Sjfv return; 531230775Sjfv} 532230775Sjfv 533230775Sjfv//////////////////////////////////////////////////////////////////////////////// 534230775Sjfv// breakpoint support 535230775Sjfv 536230775Sjfvvoid os::breakpoint() { 537230775Sjfv BREAKPOINT; 538230775Sjfv} 539230775Sjfv 540230775Sjfvextern "C" void breakpoint() { 541230775Sjfv // use debugger to set breakpoint here 542230775Sjfv} 543230775Sjfv 544230775Sjfv//////////////////////////////////////////////////////////////////////////////// 545230775Sjfv// signal support 546230775Sjfv 547230775Sjfvdebug_only(static bool signal_sets_initialized = false); 548230775Sjfvstatic sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 549230775Sjfv 550230775Sjfvbool os::Bsd::is_sig_ignored(int sig) { 551230775Sjfv struct sigaction oact; 552190873Sjfv sigaction(sig, (struct sigaction*)NULL, &oact); 553190873Sjfv void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 554230775Sjfv : CAST_FROM_FN_PTR(void*, oact.sa_handler); 555230775Sjfv if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 556230775Sjfv return true; 557230775Sjfv else 558190873Sjfv return false; 559230775Sjfv} 560230775Sjfv 561230775Sjfvvoid os::Bsd::signal_sets_init() { 562230775Sjfv // Should also have an assertion stating we are still single-threaded. 563230775Sjfv assert(!signal_sets_initialized, "Already initialized"); 564230775Sjfv // Fill in signals that are necessarily unblocked for all threads in 565230775Sjfv // the VM. Currently, we unblock the following signals: 566190873Sjfv // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 567230775Sjfv // by -Xrs (=ReduceSignalUsage)); 568230775Sjfv // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 569230775Sjfv // other threads. The "ReduceSignalUsage" boolean tells us not to alter 570230775Sjfv // the dispositions or masks wrt these signals. 571230775Sjfv // Programs embedding the VM that want to use the above signals for their 572230775Sjfv // own purposes must, at this time, use the "-Xrs" option to prevent 573230775Sjfv // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 574230775Sjfv // (See bug 4345157, and other related bugs). 575230775Sjfv // In reality, though, unblocking these signals is really a nop, since 576190873Sjfv // these signals are not blocked by default. 577190873Sjfv sigemptyset(&unblocked_sigs); 578230775Sjfv sigemptyset(&allowdebug_blocked_sigs); 579230775Sjfv sigaddset(&unblocked_sigs, SIGILL); 580230775Sjfv sigaddset(&unblocked_sigs, SIGSEGV); 581230775Sjfv sigaddset(&unblocked_sigs, SIGBUS); 582230775Sjfv sigaddset(&unblocked_sigs, SIGFPE); 583230775Sjfv sigaddset(&unblocked_sigs, SR_signum); 584230775Sjfv 585230775Sjfv if (!ReduceSignalUsage) { 586230775Sjfv if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 587230775Sjfv sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 588190873Sjfv sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 589230775Sjfv } 590190873Sjfv if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 591190873Sjfv sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 592230775Sjfv sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 593230775Sjfv } 594230775Sjfv if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 595230775Sjfv sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 596230775Sjfv sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 597230775Sjfv } 598230775Sjfv } 599230775Sjfv // Fill in signals that are blocked by all but the VM thread. 600230775Sjfv sigemptyset(&vm_sigs); 601230775Sjfv if (!ReduceSignalUsage) 602230775Sjfv sigaddset(&vm_sigs, BREAK_SIGNAL); 603230775Sjfv debug_only(signal_sets_initialized = true); 604230775Sjfv 605230775Sjfv} 606230775Sjfv 607230775Sjfv// These are signals that are unblocked while a thread is running Java. 608230775Sjfv// (For some reason, they get blocked by default.) 609230775Sjfvsigset_t* os::Bsd::unblocked_signals() { 610190873Sjfv assert(signal_sets_initialized, "Not initialized"); 611230775Sjfv return &unblocked_sigs; 612230775Sjfv} 613230775Sjfv 614230775Sjfv// These are the signals that are blocked while a (non-VM) thread is 615217593Sjfv// running Java. Only the VM thread handles these signals. 616217593Sjfvsigset_t* os::Bsd::vm_signals() { 617230775Sjfv assert(signal_sets_initialized, "Not initialized"); 618190873Sjfv return &vm_sigs; 619190873Sjfv} 620230775Sjfv 621230775Sjfv// These are signals that are blocked during cond_wait to allow debugger in 622230775Sjfvsigset_t* os::Bsd::allowdebug_blocked_signals() { 623230775Sjfv assert(signal_sets_initialized, "Not initialized"); 624230775Sjfv return &allowdebug_blocked_sigs; 625230775Sjfv} 626230775Sjfv 627230775Sjfvvoid os::Bsd::hotspot_sigmask(Thread* thread) { 628230775Sjfv 629230775Sjfv //Save caller's signal mask before setting VM signal mask 630190873Sjfv sigset_t caller_sigmask; 631247822Sjfv pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 632190873Sjfv 633230775Sjfv OSThread* osthread = thread->osthread(); 634230775Sjfv osthread->set_caller_sigmask(caller_sigmask); 635230775Sjfv 636230775Sjfv pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); 637230775Sjfv 638230775Sjfv if (!ReduceSignalUsage) { 639230775Sjfv if (thread->is_VM_thread()) { 640230775Sjfv // Only the VM thread handles BREAK_SIGNAL ... 641230775Sjfv pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 642230775Sjfv } else { 643230775Sjfv // ... all other threads block BREAK_SIGNAL 644230775Sjfv pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 645230775Sjfv } 646230775Sjfv } 647230775Sjfv} 648230775Sjfv 649230775Sjfv 650190873Sjfv////////////////////////////////////////////////////////////////////////////// 651230775Sjfv// create new thread 652230775Sjfv 653230775Sjfv// check if it's safe to start a new thread 654230775Sjfvstatic bool _thread_safety_check(Thread* thread) { 655190873Sjfv return true; 656230775Sjfv} 657230775Sjfv 658230775Sjfv#ifdef __APPLE__ 659230775Sjfv// library handle for calling objc_registerThreadWithCollector() 660230775Sjfv// without static linking to the libobjc library 661230775Sjfv#define OBJC_LIB "/usr/lib/libobjc.dylib" 662230775Sjfv#define OBJC_GCREGISTER "objc_registerThreadWithCollector" 663230775Sjfvtypedef void (*objc_registerThreadWithCollector_t)(); 664230775Sjfvextern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; 665230775Sjfvobjc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; 666190873Sjfv#endif 667230775Sjfv 668230775Sjfv#ifdef __APPLE__ 669230775Sjfvstatic uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { 670230775Sjfv // Additional thread_id used to correlate threads in SA 671230775Sjfv thread_identifier_info_data_t m_ident_info; 672230775Sjfv mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; 673230775Sjfv 674230775Sjfv thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, 675230775Sjfv (thread_info_t) &m_ident_info, &count); 676230775Sjfv 677230775Sjfv return m_ident_info.thread_id; 678190873Sjfv} 679230775Sjfv#endif 680230775Sjfv 681230775Sjfv// Thread start routine for all newly created threads 682230775Sjfvstatic void *java_start(Thread *thread) { 683230775Sjfv // Try to randomize the cache line index of hot stack frames. 684230775Sjfv // This helps when threads of the same stack traces evict each other's 685230775Sjfv // cache lines. The threads can be either from the same JVM instance, or 686190873Sjfv // from different JVM instances. The benefit is especially true for 687171384Sjfv // processors with hyperthreading technology. 688230775Sjfv static int counter = 0; 689230775Sjfv int pid = os::current_process_id(); 690230775Sjfv alloca(((pid ^ counter++) & 7) * 128); 691230775Sjfv 692230775Sjfv ThreadLocalStorage::set_thread(thread); 693230775Sjfv 694230775Sjfv OSThread* osthread = thread->osthread(); 695230775Sjfv Monitor* sync = osthread->startThread_lock(); 696230775Sjfv 697230775Sjfv // non floating stack BsdThreads needs extra check, see above 698230775Sjfv if (!_thread_safety_check(thread)) { 699230775Sjfv // notify parent thread 700230775Sjfv MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 701230775Sjfv osthread->set_state(ZOMBIE); 702230775Sjfv sync->notify_all(); 703230775Sjfv return NULL; 704230775Sjfv } 705230775Sjfv 706230775Sjfv osthread->set_thread_id(os::Bsd::gettid()); 707230775Sjfv 708230775Sjfv#ifdef __APPLE__ 709230775Sjfv uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 710230775Sjfv guarantee(unique_thread_id != 0, "unique thread id was not found"); 711230775Sjfv osthread->set_unique_thread_id(unique_thread_id); 712230775Sjfv#endif 713230775Sjfv // initialize signal mask for this thread 714230775Sjfv os::Bsd::hotspot_sigmask(thread); 715230775Sjfv 716230775Sjfv // initialize floating point control register 717230775Sjfv os::Bsd::init_thread_fpu_state(); 718230775Sjfv 719230775Sjfv#ifdef __APPLE__ 720230775Sjfv // register thread with objc gc 721230775Sjfv if (objc_registerThreadWithCollectorFunction != NULL) { 722230775Sjfv objc_registerThreadWithCollectorFunction(); 723230775Sjfv } 724230775Sjfv#endif 725230775Sjfv 726230775Sjfv // handshaking with parent thread 727230775Sjfv { 728230775Sjfv MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); 729230775Sjfv 730230775Sjfv // notify parent thread 731230775Sjfv osthread->set_state(INITIALIZED); 732230775Sjfv sync->notify_all(); 733230775Sjfv 734230775Sjfv // wait until os::start_thread() 735230775Sjfv while (osthread->get_state() == INITIALIZED) { 736230775Sjfv sync->wait(Mutex::_no_safepoint_check_flag); 737230775Sjfv } 738230775Sjfv } 739230775Sjfv 740230775Sjfv // call one more level start routine 741230775Sjfv thread->run(); 742230775Sjfv 743230775Sjfv return 0; 744230775Sjfv} 745171384Sjfv 746230775Sjfvbool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 747230775Sjfv assert(thread->osthread() == NULL, "caller responsible"); 748230775Sjfv 749230775Sjfv // Allocate the OSThread object 750171384Sjfv OSThread* osthread = new OSThread(NULL, NULL); 751230775Sjfv if (osthread == NULL) { 752230775Sjfv return false; 753230775Sjfv } 754230775Sjfv 755230775Sjfv // set the correct thread state 756230775Sjfv osthread->set_thread_type(thr_type); 757230775Sjfv 758230775Sjfv // Initial state is ALLOCATED but not INITIALIZED 759230775Sjfv osthread->set_state(ALLOCATED); 760230775Sjfv 761230775Sjfv thread->set_osthread(osthread); 762230775Sjfv 763230775Sjfv // init thread attributes 764230775Sjfv pthread_attr_t attr; 765230775Sjfv pthread_attr_init(&attr); 766230775Sjfv pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); 767230775Sjfv 768230775Sjfv // stack size 769230775Sjfv if (os::Bsd::supports_variable_stack_size()) { 770230775Sjfv // calculate stack size if it's not specified by caller 771230775Sjfv if (stack_size == 0) { 772230775Sjfv stack_size = os::Bsd::default_stack_size(thr_type); 773230775Sjfv 774230775Sjfv switch (thr_type) { 775230775Sjfv case os::java_thread: 776230775Sjfv // Java threads use ThreadStackSize which default value can be 777230775Sjfv // changed with the flag -Xss 778230775Sjfv assert (JavaThread::stack_size_at_create() > 0, "this should be set"); 779230775Sjfv stack_size = JavaThread::stack_size_at_create(); 780230775Sjfv break; 781230775Sjfv case os::compiler_thread: 782230775Sjfv if (CompilerThreadStackSize > 0) { 783230775Sjfv stack_size = (size_t)(CompilerThreadStackSize * K); 784230775Sjfv break; 785230775Sjfv } // else fall through: 786230775Sjfv // use VMThreadStackSize if CompilerThreadStackSize is not defined 787230775Sjfv case os::vm_thread: 788230775Sjfv case os::pgc_thread: 789171384Sjfv case os::cgc_thread: 790171384Sjfv case os::watcher_thread: 791230775Sjfv if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 792230775Sjfv break; 793230775Sjfv } 794230775Sjfv } 795230775Sjfv 796230775Sjfv stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); 797230775Sjfv pthread_attr_setstacksize(&attr, stack_size); 798230775Sjfv } else { 799230775Sjfv // let pthread_create() pick the default value. 800230775Sjfv } 801230775Sjfv 802230775Sjfv ThreadState state; 803230775Sjfv 804230775Sjfv { 805230775Sjfv pthread_t tid; 806230775Sjfv int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); 807230775Sjfv 808171384Sjfv pthread_attr_destroy(&attr); 809230775Sjfv 810247822Sjfv if (ret != 0) { 811230775Sjfv if (PrintMiscellaneous && (Verbose || WizardMode)) { 812230775Sjfv perror("pthread_create()"); 813230775Sjfv } 814230775Sjfv // Need to clean up stuff we've allocated so far 815230775Sjfv thread->set_osthread(NULL); 816247822Sjfv delete osthread; 817247822Sjfv return false; 818230775Sjfv } 819171384Sjfv 820230775Sjfv // Store pthread info into the OSThread 821230775Sjfv osthread->set_pthread_id(tid); 822230775Sjfv 823230775Sjfv // Wait until child thread is either initialized or aborted 824230775Sjfv { 825230775Sjfv Monitor* sync_with_child = osthread->startThread_lock(); 826230775Sjfv MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 827171384Sjfv while ((state = osthread->get_state()) == ALLOCATED) { 828230775Sjfv sync_with_child->wait(Mutex::_no_safepoint_check_flag); 829230775Sjfv } 830230775Sjfv } 831230775Sjfv 832230775Sjfv } 833230775Sjfv 834230775Sjfv // Aborted due to thread limit being reached 835171384Sjfv if (state == ZOMBIE) { 836230775Sjfv thread->set_osthread(NULL); 837230775Sjfv delete osthread; 838230775Sjfv return false; 839230775Sjfv } 840230775Sjfv 841230775Sjfv // The thread is returned suspended (in state INITIALIZED), 842230775Sjfv // and is started higher up in the call chain 843230775Sjfv assert(state == INITIALIZED, "race condition"); 844230775Sjfv return true; 845230775Sjfv} 846230775Sjfv 847230775Sjfv///////////////////////////////////////////////////////////////////////////// 848230775Sjfv// attach existing thread 849230775Sjfv 850230775Sjfv// bootstrap the main thread 851230775Sjfvbool os::create_main_thread(JavaThread* thread) { 852230775Sjfv assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); 853230775Sjfv return create_attached_thread(thread); 854230775Sjfv} 855230775Sjfv 856230775Sjfvbool os::create_attached_thread(JavaThread* thread) { 857230775Sjfv#ifdef ASSERT 858230775Sjfv thread->verify_not_published(); 859171384Sjfv#endif 860190873Sjfv 861230775Sjfv // Allocate the OSThread object 862230775Sjfv OSThread* osthread = new OSThread(NULL, NULL); 863230775Sjfv 864230775Sjfv if (osthread == NULL) { 865230775Sjfv return false; 866230775Sjfv } 867230775Sjfv 868230775Sjfv osthread->set_thread_id(os::Bsd::gettid()); 869230775Sjfv 870230775Sjfv // Store pthread info into the OSThread 871230775Sjfv#ifdef __APPLE__ 872230775Sjfv uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); 873230775Sjfv guarantee(unique_thread_id != 0, "just checking"); 874230775Sjfv osthread->set_unique_thread_id(unique_thread_id); 875230775Sjfv#endif 876230775Sjfv osthread->set_pthread_id(::pthread_self()); 877230775Sjfv 878230775Sjfv // initialize floating point control register 879230775Sjfv os::Bsd::init_thread_fpu_state(); 880230775Sjfv 881190873Sjfv // Initial thread state is RUNNABLE 882200239Sjfv osthread->set_state(RUNNABLE); 883230775Sjfv 884230775Sjfv thread->set_osthread(osthread); 885230775Sjfv 886230775Sjfv // initialize signal mask for this thread 887200239Sjfv // and save the caller's signal mask 888230775Sjfv os::Bsd::hotspot_sigmask(thread); 889230775Sjfv 890230775Sjfv return true; 891230775Sjfv} 892230775Sjfv 893230775Sjfvvoid os::pd_start_thread(Thread* thread) { 894230775Sjfv OSThread * osthread = thread->osthread(); 895238149Sjfv assert(osthread->get_state() != INITIALIZED, "just checking"); 896190873Sjfv Monitor* sync_with_child = osthread->startThread_lock(); 897230775Sjfv MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); 898230775Sjfv sync_with_child->notify(); 899230775Sjfv} 900230775Sjfv 901230775Sjfv// Free Bsd resources related to the OSThread 902230775Sjfvvoid os::free_thread(OSThread* osthread) { 903230775Sjfv assert(osthread != NULL, "osthread not set"); 904230775Sjfv 905230775Sjfv if (Thread::current()->osthread() == osthread) { 906230775Sjfv // Restore caller's signal mask 907230775Sjfv sigset_t sigmask = osthread->caller_sigmask(); 908230775Sjfv pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 909230775Sjfv } 910230775Sjfv 911230775Sjfv delete osthread; 912230775Sjfv} 913230775Sjfv 914230775Sjfv////////////////////////////////////////////////////////////////////////////// 915230775Sjfv// thread local storage 916238149Sjfv 917238149Sjfvint os::allocate_thread_local_storage() { 918230775Sjfv pthread_key_t key; 919230775Sjfv int rslt = pthread_key_create(&key, NULL); 920230775Sjfv assert(rslt == 0, "cannot allocate thread local storage"); 921230775Sjfv return (int)key; 922230775Sjfv} 923230775Sjfv 924190873Sjfv// Note: This is currently not used by VM, as we don't destroy TLS key 925171384Sjfv// on VM exit. 926230775Sjfvvoid os::free_thread_local_storage(int index) { 927230775Sjfv int rslt = pthread_key_delete((pthread_key_t)index); 928230775Sjfv assert(rslt == 0, "invalid index"); 929230775Sjfv} 930230775Sjfv 931230775Sjfvvoid os::thread_local_storage_at_put(int index, void* value) { 932230775Sjfv int rslt = pthread_setspecific((pthread_key_t)index, value); 933230775Sjfv assert(rslt == 0, "pthread_setspecific failed"); 934230775Sjfv} 935230775Sjfv 936230775Sjfvextern "C" Thread* get_thread() { 937230775Sjfv return ThreadLocalStorage::thread(); 938230775Sjfv} 939230775Sjfv 940230775Sjfv 941230775Sjfv//////////////////////////////////////////////////////////////////////////////// 942230775Sjfv// time support 943230775Sjfv 944230775Sjfv// Time since start-up in seconds to a fine granularity. 945230775Sjfv// Used by VMSelfDestructTimer and the MemProfiler. 946230775Sjfvdouble os::elapsedTime() { 947230775Sjfv 948230775Sjfv return ((double)os::elapsed_counter()) / os::elapsed_frequency(); 949230775Sjfv} 950230775Sjfv 951230775Sjfvjlong os::elapsed_counter() { 952230775Sjfv return javaTimeNanos() - initial_time_count; 953230775Sjfv} 954230775Sjfv 955230775Sjfvjlong os::elapsed_frequency() { 956230775Sjfv return NANOSECS_PER_SEC; // nanosecond resolution 957230775Sjfv} 958230775Sjfv 959230775Sjfvbool os::supports_vtime() { return true; } 960230775Sjfvbool os::enable_vtime() { return false; } 961230775Sjfvbool os::vtime_enabled() { return false; } 962230775Sjfv 963230775Sjfvdouble os::elapsedVTime() { 964230775Sjfv // better than nothing, but not much 965230775Sjfv return elapsedTime(); 966230775Sjfv} 967230775Sjfv 968230775Sjfvjlong os::javaTimeMillis() { 969230775Sjfv timeval time; 970230775Sjfv int status = gettimeofday(&time, NULL); 971230775Sjfv assert(status != -1, "bsd error"); 972230775Sjfv return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 973230775Sjfv} 974230775Sjfv 975230775Sjfv#ifndef CLOCK_MONOTONIC 976230775Sjfv#define CLOCK_MONOTONIC (1) 977230775Sjfv#endif 978230775Sjfv 979230775Sjfv#ifdef __APPLE__ 980230775Sjfvvoid os::Bsd::clock_init() { 981230775Sjfv // XXXDARWIN: Investigate replacement monotonic clock 982171384Sjfv} 983171384Sjfv#else 984230775Sjfvvoid os::Bsd::clock_init() { 985230775Sjfv struct timespec res; 986230775Sjfv struct timespec tp; 987230775Sjfv if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && 988230775Sjfv ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { 989230775Sjfv // yes, monotonic clock is supported 990230775Sjfv _clock_gettime = ::clock_gettime; 991230775Sjfv } 992230775Sjfv} 993230775Sjfv#endif 994230775Sjfv 995230775Sjfv 996230775Sjfvjlong os::javaTimeNanos() { 997230775Sjfv if (Bsd::supports_monotonic_clock()) { 998230775Sjfv struct timespec tp; 999230775Sjfv int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); 1000230775Sjfv assert(status == 0, "gettime error"); 1001230775Sjfv jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); 1002230775Sjfv return result; 1003230775Sjfv } else { 1004230775Sjfv timeval time; 1005230775Sjfv int status = gettimeofday(&time, NULL); 1006230775Sjfv assert(status != -1, "bsd error"); 1007230775Sjfv jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); 1008230775Sjfv return 1000 * usecs; 1009230775Sjfv } 1010230775Sjfv} 1011230775Sjfv 1012230775Sjfvvoid os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1013230775Sjfv if (Bsd::supports_monotonic_clock()) { 1014230775Sjfv info_ptr->max_value = ALL_64_BITS; 1015230775Sjfv 1016230775Sjfv // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past 1017230775Sjfv info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1018230775Sjfv info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1019230775Sjfv } else { 1020230775Sjfv // gettimeofday - based on time in seconds since the Epoch thus does not wrap 1021230775Sjfv info_ptr->max_value = ALL_64_BITS; 1022230775Sjfv 1023230775Sjfv // gettimeofday is a real time clock so it skips 1024230775Sjfv info_ptr->may_skip_backward = true; 1025230775Sjfv info_ptr->may_skip_forward = true; 1026230775Sjfv } 1027230775Sjfv 1028230775Sjfv info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1029230775Sjfv} 1030230775Sjfv 1031171384Sjfv// Return the real, user, and system times in seconds from an 1032230775Sjfv// arbitrary fixed point in the past. 1033230775Sjfvbool os::getTimesSecs(double* process_real_time, 1034230775Sjfv double* process_user_time, 1035230775Sjfv double* process_system_time) { 1036230775Sjfv struct tms ticks; 1037230775Sjfv clock_t real_ticks = times(&ticks); 1038230775Sjfv 1039230775Sjfv if (real_ticks == (clock_t) (-1)) { 1040230775Sjfv return false; 1041230775Sjfv } else { 1042230775Sjfv double ticks_per_second = (double) clock_tics_per_sec; 1043230775Sjfv *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1044230775Sjfv *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1045230775Sjfv *process_real_time = ((double) real_ticks) / ticks_per_second; 1046230775Sjfv 1047230775Sjfv return true; 1048230775Sjfv } 1049230775Sjfv} 1050230775Sjfv 1051230775Sjfv 1052230775Sjfvchar * os::local_time_string(char *buf, size_t buflen) { 1053230775Sjfv struct tm t; 1054200239Sjfv time_t long_time; 1055200239Sjfv time(&long_time); 1056200239Sjfv localtime_r(&long_time, &t); 1057190873Sjfv jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1058230775Sjfv t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1059190873Sjfv t.tm_hour, t.tm_min, t.tm_sec); 1060230775Sjfv return buf; 1061230775Sjfv} 1062230775Sjfv 1063230775Sjfvstruct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1064190873Sjfv return localtime_r(clock, res); 1065190873Sjfv} 1066230775Sjfv 1067230775Sjfv//////////////////////////////////////////////////////////////////////////////// 1068230775Sjfv// runtime exit support 1069230775Sjfv 1070230775Sjfv// Note: os::shutdown() might be called very early during initialization, or 1071247822Sjfv// called from signal handler. Before adding something to os::shutdown(), make 1072190873Sjfv// sure it is async-safe and can handle partially initialized VM. 1073190873Sjfvvoid os::shutdown() { 1074230775Sjfv 1075230775Sjfv // allow PerfMemory to attempt cleanup of any persistent resources 1076190873Sjfv perfMemory_exit(); 1077181003Sjfv 1078230775Sjfv // needs to remove object in file system 1079230775Sjfv AttachListener::abort(); 1080230775Sjfv 1081251964Sjfv // flush buffered output, finish log files 1082230775Sjfv ostream_abort(); 1083251964Sjfv 1084230775Sjfv // Check for abort hook 1085230775Sjfv abort_hook_t abort_hook = Arguments::abort_hook(); 1086247822Sjfv if (abort_hook != NULL) { 1087230775Sjfv abort_hook(); 1088230775Sjfv } 1089171384Sjfv 1090190873Sjfv} 1091230775Sjfv 1092230775Sjfv// Note: os::abort() might be called very early during initialization, or 1093230775Sjfv// called from signal handler. Before adding something to os::abort(), make 1094230775Sjfv// sure it is async-safe and can handle partially initialized VM. 1095230775Sjfvvoid os::abort(bool dump_core) { 1096230775Sjfv os::shutdown(); 1097230775Sjfv if (dump_core) { 1098230775Sjfv#ifndef PRODUCT 1099230775Sjfv fdStream out(defaultStream::output_fd()); 1100190873Sjfv out.print_raw("Current thread is "); 1101190873Sjfv char buf[16]; 1102230775Sjfv jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1103230775Sjfv out.print_raw_cr(buf); 1104190873Sjfv out.print_raw_cr("Dumping core ..."); 1105171384Sjfv#endif 1106230775Sjfv ::abort(); // dump core 1107230775Sjfv } 1108230775Sjfv 1109230775Sjfv ::exit(1); 1110171384Sjfv} 1111171384Sjfv 1112247822Sjfv// Die immediately, no exit hook, no abort hook, no cleanup. 1113230775Sjfvvoid os::die() { 1114171384Sjfv // _exit() on BsdThreads only kills current thread 1115171384Sjfv ::abort(); 1116230775Sjfv} 1117230775Sjfv 1118171384Sjfv// unused on bsd for now. 1119171384Sjfvvoid os::set_error_file(const char *logfile) {} 1120230775Sjfv 1121230775Sjfv 1122230775Sjfv// This method is a copy of JDK's sysGetLastErrorString 1123230775Sjfv// from src/solaris/hpi/src/system_md.c 1124171384Sjfv 1125171384Sjfvsize_t os::lasterror(char *buf, size_t len) { 1126230775Sjfv 1127230775Sjfv if (errno == 0) return 0; 1128171384Sjfv 1129230775Sjfv const char *s = ::strerror(errno); 1130230775Sjfv size_t n = ::strlen(s); 1131171384Sjfv if (n >= len) { 1132230775Sjfv n = len - 1; 1133230775Sjfv } 1134230775Sjfv ::strncpy(buf, s, n); 1135230775Sjfv buf[n] = '\0'; 1136230775Sjfv return n; 1137230775Sjfv} 1138230775Sjfv 1139238149Sjfv// Information of current thread in variety of formats 1140238149Sjfvpid_t os::Bsd::gettid() { 1141171384Sjfv int retval = -1; 1142230775Sjfv 1143230775Sjfv#ifdef __APPLE__ //XNU kernel 1144230775Sjfv // despite the fact mach port is actually not a thread id use it 1145230775Sjfv // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 1146238149Sjfv retval = ::pthread_mach_thread_np(::pthread_self()); 1147238149Sjfv guarantee(retval != 0, "just checking"); 1148238149Sjfv return retval; 1149230775Sjfv 1150171384Sjfv#elif __FreeBSD__ 1151171384Sjfv retval = syscall(SYS_thr_self); 1152230775Sjfv#elif __OpenBSD__ 1153230775Sjfv retval = syscall(SYS_getthrid); 1154230775Sjfv#elif __NetBSD__ 1155230775Sjfv retval = (pid_t) syscall(SYS__lwp_self); 1156230775Sjfv#endif 1157230775Sjfv 1158230775Sjfv if (retval == -1) { 1159230775Sjfv return getpid(); 1160230775Sjfv } 1161230775Sjfv} 1162230775Sjfv 1163230775Sjfvintx os::current_thread_id() { 1164230775Sjfv#ifdef __APPLE__ 1165230775Sjfv return (intx)::pthread_mach_thread_np(::pthread_self()); 1166230775Sjfv#else 1167230775Sjfv return (intx)::pthread_self(); 1168230775Sjfv#endif 1169230775Sjfv} 1170171384Sjfv 1171171384Sjfvint os::current_process_id() { 1172230775Sjfv 1173230775Sjfv // Under the old bsd thread library, bsd gives each thread 1174230775Sjfv // its own process id. Because of this each thread will return 1175230775Sjfv // a different pid if this method were to return the result 1176171384Sjfv // of getpid(2). Bsd provides no api that returns the pid 1177172043Sjfv // of the launcher thread for the vm. This implementation 1178230775Sjfv // returns a unique pid, the pid of the launcher thread 1179230775Sjfv // that starts the vm 'process'. 1180230775Sjfv 1181230775Sjfv // Under the NPTL, getpid() returns the same pid as the 1182172043Sjfv // launcher thread rather than a unique pid per thread. 1183172043Sjfv // Use gettid() if you want the old pre NPTL behaviour. 1184230775Sjfv 1185230775Sjfv // if you are looking for the result of a call to getpid() that 1186230775Sjfv // returns a unique pid for the calling thread, then look at the 1187230775Sjfv // OSThread::thread_id() method in osThread_bsd.hpp file 1188230775Sjfv 1189172043Sjfv return (int)(_initial_pid ? _initial_pid : getpid()); 1190190873Sjfv} 1191230775Sjfv 1192185352Sjfv// DLL functions 1193171384Sjfv 1194230775Sjfv#define JNI_LIB_PREFIX "lib" 1195230775Sjfv#ifdef __APPLE__ 1196230775Sjfv#define JNI_LIB_SUFFIX ".dylib" 1197230775Sjfv#else 1198230775Sjfv#define JNI_LIB_SUFFIX ".so" 1199230775Sjfv#endif 1200171384Sjfv 1201230775Sjfvconst char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } 1202172043Sjfv 1203230775Sjfv// This must be hard coded because it's the system's temporary 1204230775Sjfv// directory not the java application's temp directory, ala java.io.tmpdir. 1205230775Sjfv#ifdef __APPLE__ 1206230775Sjfv// macosx has a secure per-user temporary directory 1207230775Sjfvchar temp_path_storage[PATH_MAX]; 1208230775Sjfvconst char* os::get_temp_directory() { 1209171384Sjfv static char *temp_path = NULL; 1210230775Sjfv if (temp_path == NULL) { 1211230775Sjfv int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); 1212230775Sjfv if (pathSize == 0 || pathSize > PATH_MAX) { 1213230775Sjfv strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); 1214230775Sjfv } 1215230775Sjfv temp_path = temp_path_storage; 1216230775Sjfv } 1217230775Sjfv return temp_path; 1218230775Sjfv} 1219230775Sjfv#else /* __APPLE__ */ 1220230775Sjfvconst char* os::get_temp_directory() { return "/tmp"; } 1221230775Sjfv#endif /* __APPLE__ */ 1222230775Sjfv 1223230775Sjfvstatic bool file_exists(const char* filename) { 1224230775Sjfv struct stat statbuf; 1225230775Sjfv if (filename == NULL || strlen(filename) == 0) { 1226230775Sjfv return false; 1227171384Sjfv } 1228230775Sjfv return os::stat(filename, &statbuf) == 0; 1229230775Sjfv} 1230230775Sjfv 1231230775Sjfvbool os::dll_build_name(char* buffer, size_t buflen, 1232185352Sjfv const char* pname, const char* fname) { 1233179055Sjfv bool retval = false; 1234230775Sjfv // Copied from libhpi 1235179055Sjfv const size_t pnamelen = pname ? strlen(pname) : 0; 1236230775Sjfv 1237200239Sjfv // Return error on buffer overflow. 1238230775Sjfv if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { 1239230775Sjfv return retval; 1240230775Sjfv } 1241230775Sjfv 1242230775Sjfv if (pnamelen == 0) { 1243230775Sjfv snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); 1244230775Sjfv retval = true; 1245230775Sjfv } else if (strchr(pname, *os::path_separator()) != NULL) { 1246230775Sjfv int n; 1247230775Sjfv char** pelements = split_path(pname, &n); 1248230775Sjfv if (pelements == NULL) { 1249179055Sjfv return false; 1250230775Sjfv } 1251230775Sjfv for (int i = 0 ; i < n ; i++) { 1252171384Sjfv // Really shouldn't be NULL, but check can't hurt 1253171384Sjfv if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1254230775Sjfv continue; // skip the empty path values 1255230775Sjfv } 1256230775Sjfv snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, 1257230775Sjfv pelements[i], fname); 1258230775Sjfv if (file_exists(buffer)) { 1259230775Sjfv retval = true; 1260171384Sjfv break; 1261179055Sjfv } 1262230775Sjfv } 1263179055Sjfv // release the storage 1264185352Sjfv for (int i = 0 ; i < n ; i++) { 1265230775Sjfv if (pelements[i] != NULL) { 1266230775Sjfv FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1267230775Sjfv } 1268230775Sjfv } 1269230775Sjfv if (pelements != NULL) { 1270230775Sjfv FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1271230775Sjfv } 1272230775Sjfv } else { 1273230775Sjfv snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); 1274230775Sjfv retval = true; 1275185352Sjfv } 1276171384Sjfv return retval; 1277230775Sjfv} 1278230775Sjfv 1279230775Sjfv// check if addr is inside libjvm.so 1280230775Sjfvbool os::address_is_in_vm(address addr) { 1281230775Sjfv static address libjvm_base_addr; 1282230775Sjfv Dl_info dlinfo; 1283230775Sjfv 1284230775Sjfv if (libjvm_base_addr == NULL) { 1285230775Sjfv if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1286230775Sjfv libjvm_base_addr = (address)dlinfo.dli_fbase; 1287230775Sjfv } 1288230775Sjfv assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1289230775Sjfv } 1290171384Sjfv 1291230775Sjfv if (dladdr((void *)addr, &dlinfo) != 0) { 1292230775Sjfv if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1293230775Sjfv } 1294230775Sjfv 1295230775Sjfv return false; 1296230775Sjfv} 1297230775Sjfv 1298230775Sjfv 1299230775Sjfv#define MACH_MAXSYMLEN 256 1300230775Sjfv 1301230775Sjfvbool os::dll_address_to_function_name(address addr, char *buf, 1302230775Sjfv int buflen, int *offset) { 1303230775Sjfv // buf is not optional, but offset is optional 1304230775Sjfv assert(buf != NULL, "sanity check"); 1305230775Sjfv 1306230775Sjfv Dl_info dlinfo; 1307230775Sjfv char localbuf[MACH_MAXSYMLEN]; 1308230775Sjfv 1309230775Sjfv if (dladdr((void*)addr, &dlinfo) != 0) { 1310230775Sjfv // see if we have a matching symbol 1311230775Sjfv if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1312230775Sjfv if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1313230775Sjfv jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1314171384Sjfv } 1315230775Sjfv if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1316230775Sjfv return true; 1317230775Sjfv } 1318230775Sjfv // no matching symbol so try for just file info 1319230775Sjfv if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1320230775Sjfv if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1321230775Sjfv buf, buflen, offset, dlinfo.dli_fname)) { 1322230775Sjfv return true; 1323230775Sjfv } 1324171384Sjfv } 1325171384Sjfv 1326230775Sjfv // Handle non-dynamic manually: 1327230775Sjfv if (dlinfo.dli_fbase != NULL && 1328230775Sjfv Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, 1329230775Sjfv dlinfo.dli_fbase)) { 1330230775Sjfv if (!Decoder::demangle(localbuf, buf, buflen)) { 1331171384Sjfv jio_snprintf(buf, buflen, "%s", localbuf); 1332171384Sjfv } 1333230775Sjfv return true; 1334230775Sjfv } 1335230775Sjfv } 1336230775Sjfv buf[0] = '\0'; 1337230775Sjfv if (offset != NULL) *offset = -1; 1338230775Sjfv return false; 1339230775Sjfv} 1340230775Sjfv 1341230775Sjfv// ported from solaris version 1342230775Sjfvbool os::dll_address_to_library_name(address addr, char* buf, 1343230775Sjfv int buflen, int* offset) { 1344230775Sjfv // buf is not optional, but offset is optional 1345230775Sjfv assert(buf != NULL, "sanity check"); 1346230775Sjfv 1347230775Sjfv Dl_info dlinfo; 1348171384Sjfv 1349171384Sjfv if (dladdr((void*)addr, &dlinfo) != 0) { 1350230775Sjfv if (dlinfo.dli_fname != NULL) { 1351230775Sjfv jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1352171384Sjfv } 1353190873Sjfv if (dlinfo.dli_fbase != NULL && offset != NULL) { 1354230775Sjfv *offset = addr - (address)dlinfo.dli_fbase; 1355230775Sjfv } 1356230775Sjfv return true; 1357230775Sjfv } 1358230775Sjfv 1359190873Sjfv buf[0] = '\0'; 1360190873Sjfv if (offset) *offset = -1; 1361230775Sjfv return false; 1362230775Sjfv} 1363230775Sjfv 1364230775Sjfv// Loads .dll/.so and 1365230775Sjfv// in case of error it checks if .dll/.so was built for the 1366190873Sjfv// same architecture as Hotspot is running on 1367190873Sjfv 1368230775Sjfv#ifdef __APPLE__ 1369190873Sjfvvoid * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1370230775Sjfv void * result= ::dlopen(filename, RTLD_LAZY); 1371194875Sjfv if (result != NULL) { 1372171384Sjfv // Successful loading 1373230775Sjfv return result; 1374230775Sjfv } 1375230775Sjfv 1376230775Sjfv // Read system error message into ebuf 1377230775Sjfv ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1378230775Sjfv ebuf[ebuflen-1]='\0'; 1379171384Sjfv 1380230775Sjfv return NULL; 1381230775Sjfv} 1382230775Sjfv#else 1383230775Sjfvvoid * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1384230775Sjfv{ 1385230775Sjfv void * result= ::dlopen(filename, RTLD_LAZY); 1386230775Sjfv if (result != NULL) { 1387230775Sjfv // Successful loading 1388230775Sjfv return result; 1389230775Sjfv } 1390230775Sjfv 1391230775Sjfv Elf32_Ehdr elf_head; 1392230775Sjfv 1393230775Sjfv // Read system error message into ebuf 1394230775Sjfv // It may or may not be overwritten below 1395230775Sjfv ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1396230775Sjfv ebuf[ebuflen-1]='\0'; 1397230775Sjfv int diag_msg_max_length=ebuflen-strlen(ebuf); 1398230775Sjfv char* diag_msg_buf=ebuf+strlen(ebuf); 1399230775Sjfv 1400230775Sjfv if (diag_msg_max_length==0) { 1401230775Sjfv // No more space in ebuf for additional diagnostics message 1402230775Sjfv return NULL; 1403230775Sjfv } 1404230775Sjfv 1405230775Sjfv 1406230775Sjfv int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1407230775Sjfv 1408230775Sjfv if (file_descriptor < 0) { 1409230775Sjfv // Can't open library, report dlerror() message 1410230775Sjfv return NULL; 1411230775Sjfv } 1412190873Sjfv 1413230775Sjfv bool failed_to_read_elf_head= 1414190873Sjfv (sizeof(elf_head)!= 1415171384Sjfv (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1416230775Sjfv 1417230775Sjfv ::close(file_descriptor); 1418171384Sjfv if (failed_to_read_elf_head) { 1419171384Sjfv // file i/o error - report dlerror() msg 1420230775Sjfv return NULL; 1421230775Sjfv } 1422171384Sjfv 1423171384Sjfv typedef struct { 1424230775Sjfv Elf32_Half code; // Actual value as defined in elf.h 1425171384Sjfv Elf32_Half compat_class; // Compatibility of archs at VM's sense 1426171384Sjfv char elf_class; // 32 or 64 bit 1427230775Sjfv char endianess; // MSB or LSB 1428171384Sjfv char* name; // String representation 1429230775Sjfv } arch_t; 1430230775Sjfv 1431230775Sjfv #ifndef EM_486 1432230775Sjfv #define EM_486 6 /* Intel 80486 */ 1433230775Sjfv #endif 1434230775Sjfv 1435171384Sjfv #ifndef EM_MIPS_RS3_LE 1436190873Sjfv #define EM_MIPS_RS3_LE 10 /* MIPS */ 1437230775Sjfv #endif 1438230775Sjfv 1439179055Sjfv #ifndef EM_PPC64 1440171384Sjfv #define EM_PPC64 21 /* PowerPC64 */ 1441171384Sjfv #endif 1442171384Sjfv 1443230775Sjfv #ifndef EM_S390 1444230775Sjfv #define EM_S390 22 /* IBM System/390 */ 1445230775Sjfv #endif 1446230775Sjfv 1447230775Sjfv #ifndef EM_IA_64 1448230775Sjfv #define EM_IA_64 50 /* HP/Intel IA-64 */ 1449230775Sjfv #endif 1450230775Sjfv 1451230775Sjfv #ifndef EM_X86_64 1452238149Sjfv #define EM_X86_64 62 /* AMD x86-64 */ 1453230775Sjfv #endif 1454230775Sjfv 1455230775Sjfv static const arch_t arch_array[]={ 1456230775Sjfv {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1457230775Sjfv {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1458230775Sjfv {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1459230775Sjfv {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1460230775Sjfv {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1461171384Sjfv {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1462171384Sjfv {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1463230775Sjfv {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1464230775Sjfv {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1465230775Sjfv {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1466230775Sjfv {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, 1467230775Sjfv {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, 1468230775Sjfv {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, 1469230775Sjfv {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, 1470238149Sjfv {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, 1471230775Sjfv {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} 1472230775Sjfv }; 1473230775Sjfv 1474230775Sjfv #if (defined IA32) 1475230775Sjfv static Elf32_Half running_arch_code=EM_386; 1476230775Sjfv #elif (defined AMD64) 1477230775Sjfv static Elf32_Half running_arch_code=EM_X86_64; 1478230775Sjfv #elif (defined IA64) 1479171384Sjfv static Elf32_Half running_arch_code=EM_IA_64; 1480171384Sjfv #elif (defined __sparc) && (defined _LP64) 1481230775Sjfv static Elf32_Half running_arch_code=EM_SPARCV9; 1482230775Sjfv #elif (defined __sparc) && (!defined _LP64) 1483230775Sjfv static Elf32_Half running_arch_code=EM_SPARC; 1484230775Sjfv #elif (defined __powerpc64__) 1485230775Sjfv static Elf32_Half running_arch_code=EM_PPC64; 1486230775Sjfv #elif (defined __powerpc__) 1487230775Sjfv static Elf32_Half running_arch_code=EM_PPC; 1488230775Sjfv #elif (defined ARM) 1489238149Sjfv static Elf32_Half running_arch_code=EM_ARM; 1490230775Sjfv #elif (defined S390) 1491230775Sjfv static Elf32_Half running_arch_code=EM_S390; 1492230775Sjfv #elif (defined ALPHA) 1493230775Sjfv static Elf32_Half running_arch_code=EM_ALPHA; 1494230775Sjfv #elif (defined MIPSEL) 1495230775Sjfv static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; 1496230775Sjfv #elif (defined PARISC) 1497230775Sjfv static Elf32_Half running_arch_code=EM_PARISC; 1498171384Sjfv #elif (defined MIPS) 1499171384Sjfv static Elf32_Half running_arch_code=EM_MIPS; 1500230775Sjfv #elif (defined M68K) 1501230775Sjfv static Elf32_Half running_arch_code=EM_68K; 1502230775Sjfv #else 1503230775Sjfv #error Method os::dll_load requires that one of following is defined:\ 1504230775Sjfv IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K 1505230775Sjfv #endif 1506230775Sjfv 1507238149Sjfv // Identify compatability class for VM's architecture and library's architecture 1508230775Sjfv // Obtain string descriptions for architectures 1509230775Sjfv 1510230775Sjfv arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1511230775Sjfv int running_arch_index=-1; 1512230775Sjfv 1513230775Sjfv for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1514230775Sjfv if (running_arch_code == arch_array[i].code) { 1515230775Sjfv running_arch_index = i; 1516171384Sjfv } 1517171384Sjfv if (lib_arch.code == arch_array[i].code) { 1518230775Sjfv lib_arch.compat_class = arch_array[i].compat_class; 1519230775Sjfv lib_arch.name = arch_array[i].name; 1520230775Sjfv } 1521230775Sjfv } 1522171384Sjfv 1523179055Sjfv assert(running_arch_index != -1, 1524230775Sjfv "Didn't find running architecture code (running_arch_code) in arch_array"); 1525230775Sjfv if (running_arch_index == -1) { 1526230775Sjfv // Even though running architecture detection failed 1527230775Sjfv // we may still continue with reporting dlerror() message 1528230775Sjfv return NULL; 1529230775Sjfv } 1530230775Sjfv 1531230775Sjfv if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1532230775Sjfv ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1533230775Sjfv return NULL; 1534230775Sjfv } 1535230775Sjfv 1536230775Sjfv#ifndef S390 1537230775Sjfv if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1538230775Sjfv ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1539230775Sjfv return NULL; 1540230775Sjfv } 1541230775Sjfv#endif // !S390 1542230775Sjfv 1543230775Sjfv if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1544230775Sjfv if ( lib_arch.name!=NULL ) { 1545230775Sjfv ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1546230775Sjfv " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1547171384Sjfv lib_arch.name, arch_array[running_arch_index].name); 1548230775Sjfv } else { 1549230775Sjfv ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1550230775Sjfv " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1551230775Sjfv lib_arch.code, 1552230775Sjfv arch_array[running_arch_index].name); 1553230775Sjfv } 1554230775Sjfv } 1555230775Sjfv 1556230775Sjfv return NULL; 1557230775Sjfv} 1558230775Sjfv#endif /* !__APPLE__ */ 1559230775Sjfv 1560230775Sjfv// XXX: Do we need a lock around this as per Linux? 1561230775Sjfvvoid* os::dll_lookup(void* handle, const char* name) { 1562230775Sjfv return dlsym(handle, name); 1563230775Sjfv} 1564230775Sjfv 1565230775Sjfv 1566190873Sjfvstatic bool _print_ascii_file(const char* filename, outputStream* st) { 1567171384Sjfv int fd = ::open(filename, O_RDONLY); 1568230775Sjfv if (fd == -1) { 1569171384Sjfv return false; 1570171384Sjfv } 1571230775Sjfv 1572230775Sjfv char buf[32]; 1573230775Sjfv int bytes; 1574230775Sjfv while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1575230775Sjfv st->print_raw(buf, bytes); 1576230775Sjfv } 1577230775Sjfv 1578171384Sjfv ::close(fd); 1579230775Sjfv 1580230775Sjfv return true; 1581171384Sjfv} 1582230775Sjfv 1583171384Sjfvvoid os::print_dll_info(outputStream *st) { 1584230775Sjfv st->print_cr("Dynamic libraries:"); 1585171384Sjfv#ifdef RTLD_DI_LINKMAP 1586190873Sjfv Dl_info dli; 1587230775Sjfv void *handle; 1588230775Sjfv Link_map *map; 1589230775Sjfv Link_map *p; 1590230775Sjfv 1591230775Sjfv if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1592230775Sjfv dli.dli_fname == NULL) { 1593238149Sjfv st->print_cr("Error: Cannot print dynamic libraries."); 1594190873Sjfv return; 1595230775Sjfv } 1596230775Sjfv handle = dlopen(dli.dli_fname, RTLD_LAZY); 1597230775Sjfv if (handle == NULL) { 1598230775Sjfv st->print_cr("Error: Cannot print dynamic libraries."); 1599190873Sjfv return; 1600190873Sjfv } 1601190873Sjfv dlinfo(handle, RTLD_DI_LINKMAP, &map); 1602230775Sjfv if (map == NULL) { 1603230775Sjfv st->print_cr("Error: Cannot print dynamic libraries."); 1604190873Sjfv return; 1605190873Sjfv } 1606230775Sjfv 1607230775Sjfv while (map->l_prev != NULL) 1608230775Sjfv map = map->l_prev; 1609230775Sjfv 1610190873Sjfv while (map != NULL) { 1611230775Sjfv st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1612230775Sjfv map = map->l_next; 1613230775Sjfv } 1614230775Sjfv 1615171384Sjfv dlclose(handle); 1616230775Sjfv#elif defined(__APPLE__) 1617230775Sjfv uint32_t count; 1618230775Sjfv uint32_t i; 1619230775Sjfv 1620230775Sjfv count = _dyld_image_count(); 1621171384Sjfv for (i = 1; i < count; i++) { 1622190873Sjfv const char *name = _dyld_get_image_name(i); 1623230775Sjfv intptr_t slide = _dyld_get_image_vmaddr_slide(i); 1624230775Sjfv st->print_cr(PTR_FORMAT " \t%s", slide, name); 1625230775Sjfv } 1626215911Sjfv#else 1627230775Sjfv st->print_cr("Error: Cannot print dynamic libraries."); 1628230775Sjfv#endif 1629179055Sjfv} 1630230775Sjfv 1631171384Sjfvvoid os::print_os_info_brief(outputStream* st) { 1632171384Sjfv st->print("Bsd"); 1633230775Sjfv 1634230775Sjfv os::Posix::print_uname_info(st); 1635230775Sjfv} 1636171384Sjfv 1637230775Sjfvvoid os::print_os_info(outputStream* st) { 1638230775Sjfv st->print("OS:"); 1639171384Sjfv st->print("Bsd"); 1640171384Sjfv 1641230775Sjfv os::Posix::print_uname_info(st); 1642230775Sjfv 1643230775Sjfv os::Posix::print_rlimit_info(st); 1644230775Sjfv 1645230775Sjfv os::Posix::print_load_average(st); 1646230775Sjfv} 1647230775Sjfv 1648238149Sjfvvoid os::pd_print_cpu_info(outputStream* st) { 1649238149Sjfv // Nothing to do for now. 1650238149Sjfv} 1651247822Sjfv 1652238149Sjfvvoid os::print_memory_info(outputStream* st) { 1653238149Sjfv 1654230775Sjfv st->print("Memory:"); 1655238149Sjfv st->print(" %dk page", os::vm_page_size()>>10); 1656238149Sjfv 1657238149Sjfv st->print(", physical " UINT64_FORMAT "k", 1658238149Sjfv os::physical_memory() >> 10); 1659171384Sjfv st->print("(" UINT64_FORMAT "k free)", 1660238149Sjfv os::available_memory() >> 10); 1661171384Sjfv st->cr(); 1662230775Sjfv 1663230775Sjfv // meminfo 1664230775Sjfv st->print("\n/proc/meminfo:\n"); 1665230775Sjfv _print_ascii_file("/proc/meminfo", st); 1666230775Sjfv st->cr(); 1667230775Sjfv} 1668230775Sjfv 1669230775Sjfv// Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific 1670171384Sjfv// but they're the same for all the bsd arch that we support 1671171384Sjfv// and they're the same for solaris but there's no common place to put this. 1672230775Sjfvconst char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 1673230775Sjfv "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 1674230775Sjfv "ILL_COPROC", "ILL_BADSTK" }; 1675230775Sjfv 1676230775Sjfvconst char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 1677230775Sjfv "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 1678230775Sjfv "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; 1679230775Sjfv 1680171384Sjfvconst char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 1681171384Sjfv 1682190873Sjfvconst char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 1683230775Sjfv 1684230775Sjfvvoid os::print_siginfo(outputStream* st, void* siginfo) { 1685230775Sjfv st->print("siginfo:"); 1686230775Sjfv 1687230775Sjfv const int buflen = 100; 1688230775Sjfv char buf[buflen]; 1689230775Sjfv siginfo_t *si = (siginfo_t*)siginfo; 1690230775Sjfv st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 1691230775Sjfv if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { 1692230775Sjfv st->print("si_errno=%s", buf); 1693230775Sjfv } else { 1694230775Sjfv st->print("si_errno=%d", si->si_errno); 1695230775Sjfv } 1696230775Sjfv const int c = si->si_code; 1697230775Sjfv assert(c > 0, "unexpected si_code"); 1698230775Sjfv switch (si->si_signo) { 1699230775Sjfv case SIGILL: 1700230775Sjfv st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 1701230775Sjfv st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1702230775Sjfv break; 1703230775Sjfv case SIGFPE: 1704230775Sjfv st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 1705230775Sjfv st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1706230775Sjfv break; 1707230775Sjfv case SIGSEGV: 1708230775Sjfv st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 1709230775Sjfv st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1710230775Sjfv break; 1711171384Sjfv case SIGBUS: 1712230775Sjfv st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 1713230775Sjfv st->print(", si_addr=" PTR_FORMAT, si->si_addr); 1714230775Sjfv break; 1715230775Sjfv default: 1716230775Sjfv st->print(", si_code=%d", si->si_code); 1717230775Sjfv // no si_addr 1718230775Sjfv } 1719230775Sjfv 1720230775Sjfv if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1721230775Sjfv UseSharedSpaces) { 1722230775Sjfv FileMapInfo* mapinfo = FileMapInfo::current_info(); 1723171384Sjfv if (mapinfo->is_in_shared_space(si->si_addr)) { 1724230775Sjfv st->print("\n\nError accessing class data sharing archive." \ 1725230775Sjfv " Mapped file inaccessible during execution, " \ 1726230775Sjfv " possible disk/network problem."); 1727230775Sjfv } 1728230775Sjfv } 1729230775Sjfv st->cr(); 1730251964Sjfv} 1731251964Sjfv 1732190873Sjfv 1733230775Sjfvstatic void print_signal_handler(outputStream* st, int sig, 1734230775Sjfv char* buf, size_t buflen); 1735230775Sjfv 1736230775Sjfvvoid os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1737205720Sjfv st->print_cr("Signal Handlers:"); 1738171384Sjfv print_signal_handler(st, SIGSEGV, buf, buflen); 1739230775Sjfv print_signal_handler(st, SIGBUS , buf, buflen); 1740230775Sjfv print_signal_handler(st, SIGFPE , buf, buflen); 1741230775Sjfv print_signal_handler(st, SIGPIPE, buf, buflen); 1742230775Sjfv print_signal_handler(st, SIGXFSZ, buf, buflen); 1743230775Sjfv print_signal_handler(st, SIGILL , buf, buflen); 1744230775Sjfv print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 1745230775Sjfv print_signal_handler(st, SR_signum, buf, buflen); 1746230775Sjfv print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1747230775Sjfv print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1748230775Sjfv print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1749230775Sjfv print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1750230775Sjfv} 1751230775Sjfv 1752230775Sjfvstatic char saved_jvm_path[MAXPATHLEN] = {0}; 1753230775Sjfv 1754230775Sjfv// Find the full path to the current module, libjvm 1755171384Sjfvvoid os::jvm_path(char *buf, jint buflen) { 1756230775Sjfv // Error checking. 1757230775Sjfv if (buflen < MAXPATHLEN) { 1758230775Sjfv assert(false, "must use a large-enough buffer"); 1759230775Sjfv buf[0] = '\0'; 1760230775Sjfv return; 1761230775Sjfv } 1762171384Sjfv // Lazy resolve the path to current module. 1763230775Sjfv if (saved_jvm_path[0] != 0) { 1764200239Sjfv strcpy(buf, saved_jvm_path); 1765172043Sjfv return; 1766230775Sjfv } 1767230775Sjfv 1768230775Sjfv char dli_fname[MAXPATHLEN]; 1769230775Sjfv bool ret = dll_address_to_library_name( 1770230775Sjfv CAST_FROM_FN_PTR(address, os::jvm_path), 1771230775Sjfv dli_fname, sizeof(dli_fname), NULL); 1772230775Sjfv assert(ret, "cannot locate libjvm"); 1773172043Sjfv char *rp = NULL; 1774230775Sjfv if (ret && dli_fname[0] != '\0') { 1775230775Sjfv rp = realpath(dli_fname, buf); 1776172043Sjfv } 1777172043Sjfv if (rp == NULL) 1778230775Sjfv return; 1779230775Sjfv 1780230775Sjfv if (Arguments::created_by_gamma_launcher()) { 1781230775Sjfv // Support for the gamma launcher. Typical value for buf is 1782230775Sjfv // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at 1783230775Sjfv // the right place in the string, then assume we are installed in a JDK and 1784172043Sjfv // we're done. Otherwise, check for a JAVA_HOME environment variable and 1785200239Sjfv // construct a path to the JVM being overridden. 1786230775Sjfv 1787230775Sjfv const char *p = buf + strlen(buf) - 1; 1788230775Sjfv for (int count = 0; p > buf && count < 5; ++count) { 1789230775Sjfv for (--p; p > buf && *p != '/'; --p) 1790200239Sjfv /* empty */ ; 1791171384Sjfv } 1792230775Sjfv 1793230775Sjfv if (strncmp(p, "/jre/lib/", 9) != 0) { 1794230775Sjfv // Look for JAVA_HOME in the environment. 1795230775Sjfv char* java_home_var = ::getenv("JAVA_HOME"); 1796171384Sjfv if (java_home_var != NULL && java_home_var[0] != 0) { 1797200239Sjfv char* jrelib_p; 1798230775Sjfv int len; 1799230775Sjfv 1800230775Sjfv // Check the current module name "libjvm" 1801230775Sjfv p = strrchr(buf, '/'); 1802230775Sjfv assert(strstr(p, "/libjvm") == p, "invalid library name"); 1803230775Sjfv 1804171384Sjfv rp = realpath(java_home_var, buf); 1805230775Sjfv if (rp == NULL) 1806230775Sjfv return; 1807230775Sjfv 1808171384Sjfv // determine if this is a legacy image or modules image 1809230775Sjfv // modules image doesn't have "jre" subdirectory 1810230775Sjfv len = strlen(buf); 1811230775Sjfv jrelib_p = buf + len; 1812230775Sjfv 1813230775Sjfv // Add the appropriate library subdir 1814230775Sjfv snprintf(jrelib_p, buflen-len, "/jre/lib"); 1815230775Sjfv if (0 != access(buf, F_OK)) { 1816230775Sjfv snprintf(jrelib_p, buflen-len, "/lib"); 1817230775Sjfv } 1818230775Sjfv 1819230775Sjfv // Add the appropriate client or server subdir 1820230775Sjfv len = strlen(buf); 1821230775Sjfv jrelib_p = buf + len; 1822230775Sjfv snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); 1823230775Sjfv if (0 != access(buf, F_OK)) { 1824171384Sjfv snprintf(jrelib_p, buflen-len, ""); 1825230775Sjfv } 1826230775Sjfv 1827230775Sjfv // If the path exists within JAVA_HOME, add the JVM library name 1828171384Sjfv // to complete the path to JVM being overridden. Otherwise fallback 1829230775Sjfv // to the path to the current library. 1830230775Sjfv if (0 == access(buf, F_OK)) { 1831230775Sjfv // Use current module name "libjvm" 1832171384Sjfv len = strlen(buf); 1833215911Sjfv snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); 1834230775Sjfv } else { 1835215911Sjfv // Fall back to path of current library 1836171384Sjfv rp = realpath(dli_fname, buf); 1837230775Sjfv if (rp == NULL) 1838230775Sjfv return; 1839230775Sjfv } 1840230775Sjfv } 1841230775Sjfv } 1842230775Sjfv } 1843230775Sjfv 1844230775Sjfv strcpy(saved_jvm_path, buf); 1845230775Sjfv} 1846230775Sjfv 1847230775Sjfvvoid os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1848230775Sjfv // no prefix required, not even "_" 1849230775Sjfv} 1850230775Sjfv 1851230775Sjfvvoid os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1852230775Sjfv // no suffix required 1853230775Sjfv} 1854230775Sjfv 1855230775Sjfv//////////////////////////////////////////////////////////////////////////////// 1856230775Sjfv// sun.misc.Signal support 1857230775Sjfv 1858230775Sjfvstatic volatile jint sigint_count = 0; 1859171384Sjfv 1860230775Sjfvstatic void 1861230775SjfvUserHandler(int sig, void *siginfo, void *context) { 1862230775Sjfv // 4511530 - sem_post is serialized and handled by the manager thread. When 1863230775Sjfv // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1864238149Sjfv // don't want to flood the manager thread with sem_post requests. 1865230775Sjfv if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1866238149Sjfv return; 1867230775Sjfv 1868190873Sjfv // Ctrl-C is pressed during error reporting, likely because the error 1869230775Sjfv // handler fails to abort. Let VM die immediately. 1870190873Sjfv if (sig == SIGINT && is_error_reported()) { 1871172043Sjfv os::die(); 1872230775Sjfv } 1873230775Sjfv 1874230775Sjfv os::signal_notify(sig); 1875172043Sjfv} 1876171384Sjfv 1877230775Sjfvvoid* os::user_handler() { 1878230775Sjfv return CAST_FROM_FN_PTR(void*, UserHandler); 1879230775Sjfv} 1880230775Sjfv 1881230775Sjfvextern "C" { 1882230775Sjfv typedef void (*sa_handler_t)(int); 1883179055Sjfv typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1884230775Sjfv} 1885230775Sjfv 1886230775Sjfvvoid* os::signal(int signal_number, void* handler) { 1887230775Sjfv struct sigaction sigAct, oldSigAct; 1888230775Sjfv 1889230775Sjfv sigfillset(&(sigAct.sa_mask)); 1890171384Sjfv sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1891171384Sjfv sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1892230775Sjfv 1893230775Sjfv if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1894230775Sjfv // -1 means registration failed 1895230775Sjfv return (void *)-1; 1896230775Sjfv } 1897230775Sjfv 1898171384Sjfv return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1899230775Sjfv} 1900171384Sjfv 1901230775Sjfvvoid os::signal_raise(int signal_number) { 1902247822Sjfv ::raise(signal_number); 1903230775Sjfv} 1904251964Sjfv 1905251964Sjfv/* 1906230775Sjfv * The following code is moved from os.cpp for making this 1907171384Sjfv * code platform specific, which it is by its very nature. 1908230775Sjfv */ 1909171384Sjfv 1910171384Sjfv// Will be modified when max signal is changed to be dynamic 1911200239Sjfvint os::sigexitnum_pd() { 1912200239Sjfv return NSIG; 1913230775Sjfv} 1914171384Sjfv 1915200239Sjfv// a counter for each possible signal value 1916230775Sjfvstatic volatile jint pending_signals[NSIG+1] = { 0 }; 1917200239Sjfv 1918230775Sjfv// Bsd(POSIX) specific hand shaking semaphore. 1919230775Sjfv#ifdef __APPLE__ 1920230775Sjfvtypedef semaphore_t os_semaphore_t; 1921230775Sjfv#define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) 1922194875Sjfv#define SEM_WAIT(sem) semaphore_wait(sem) 1923230775Sjfv#define SEM_POST(sem) semaphore_signal(sem) 1924230775Sjfv#define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) 1925230775Sjfv#else 1926230775Sjfvtypedef sem_t os_semaphore_t; 1927230775Sjfv#define SEM_INIT(sem, value) sem_init(&sem, 0, value) 1928230775Sjfv#define SEM_WAIT(sem) sem_wait(&sem) 1929230775Sjfv#define SEM_POST(sem) sem_post(&sem) 1930230775Sjfv#define SEM_DESTROY(sem) sem_destroy(&sem) 1931230775Sjfv#endif 1932230775Sjfv 1933230775Sjfvclass Semaphore : public StackObj { 1934230775Sjfv public: 1935230775Sjfv Semaphore(); 1936230775Sjfv ~Semaphore(); 1937230775Sjfv void signal(); 1938230775Sjfv void wait(); 1939230775Sjfv bool trywait(); 1940230775Sjfv bool timedwait(unsigned int sec, int nsec); 1941230775Sjfv private: 1942230775Sjfv jlong currenttime() const; 1943230775Sjfv os_semaphore_t _semaphore; 1944230775Sjfv}; 1945190873Sjfv 1946251964SjfvSemaphore::Semaphore() : _semaphore(0) { 1947251964Sjfv SEM_INIT(_semaphore, 0); 1948251964Sjfv} 1949251964Sjfv 1950251964SjfvSemaphore::~Semaphore() { 1951251964Sjfv SEM_DESTROY(_semaphore); 1952251964Sjfv} 1953251964Sjfv 1954251964Sjfvvoid Semaphore::signal() { 1955251964Sjfv SEM_POST(_semaphore); 1956251964Sjfv} 1957251964Sjfv 1958230775Sjfvvoid Semaphore::wait() { 1959230775Sjfv SEM_WAIT(_semaphore); 1960230775Sjfv} 1961230775Sjfv 1962171384Sjfvjlong Semaphore::currenttime() const { 1963230775Sjfv struct timeval tv; 1964230775Sjfv gettimeofday(&tv, NULL); 1965230775Sjfv return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); 1966230775Sjfv} 1967230775Sjfv 1968230775Sjfv#ifdef __APPLE__ 1969230775Sjfvbool Semaphore::trywait() { 1970230775Sjfv return timedwait(0, 0); 1971230775Sjfv} 1972230775Sjfv 1973230775Sjfvbool Semaphore::timedwait(unsigned int sec, int nsec) { 1974230775Sjfv kern_return_t kr = KERN_ABORTED; 1975238149Sjfv mach_timespec_t waitspec; 1976230775Sjfv waitspec.tv_sec = sec; 1977230775Sjfv waitspec.tv_nsec = nsec; 1978230775Sjfv 1979171384Sjfv jlong starttime = currenttime(); 1980251964Sjfv 1981251964Sjfv kr = semaphore_timedwait(_semaphore, waitspec); 1982251964Sjfv while (kr == KERN_ABORTED) { 1983251964Sjfv jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; 1984251964Sjfv 1985251964Sjfv jlong current = currenttime(); 1986251964Sjfv jlong passedtime = current - starttime; 1987251964Sjfv 1988251964Sjfv if (passedtime >= totalwait) { 1989251964Sjfv waitspec.tv_sec = 0; 1990251964Sjfv waitspec.tv_nsec = 0; 1991171384Sjfv } else { 1992230775Sjfv jlong waittime = totalwait - (current - starttime); 1993171384Sjfv waitspec.tv_sec = waittime / NANOSECS_PER_SEC; 1994230775Sjfv waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; 1995171384Sjfv } 1996230775Sjfv 1997171384Sjfv kr = semaphore_timedwait(_semaphore, waitspec); 1998171384Sjfv } 1999230775Sjfv 2000230775Sjfv return kr == KERN_SUCCESS; 2001230775Sjfv} 2002171384Sjfv 2003171384Sjfv#else 2004230775Sjfv 2005230775Sjfvbool Semaphore::trywait() { 2006230775Sjfv return sem_trywait(&_semaphore) == 0; 2007230775Sjfv} 2008171384Sjfv 2009171384Sjfvbool Semaphore::timedwait(unsigned int sec, int nsec) { 2010230775Sjfv struct timespec ts; 2011230775Sjfv unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2012230775Sjfv 2013230775Sjfv while (1) { 2014230775Sjfv int result = sem_timedwait(&_semaphore, &ts); 2015230775Sjfv if (result == 0) { 2016230775Sjfv return true; 2017230775Sjfv } else if (errno == EINTR) { 2018230775Sjfv continue; 2019230775Sjfv } else if (errno == ETIMEDOUT) { 2020230775Sjfv return false; 2021230775Sjfv } else { 2022230775Sjfv return false; 2023230775Sjfv } 2024230775Sjfv } 2025230775Sjfv} 2026171384Sjfv 2027171384Sjfv#endif // __APPLE__ 2028230775Sjfv 2029230775Sjfvstatic os_semaphore_t sig_sem; 2030230775Sjfvstatic Semaphore sr_semaphore; 2031171384Sjfv 2032230775Sjfvvoid os::signal_init_pd() { 2033230775Sjfv // Initialize signal structures 2034171384Sjfv ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 2035230775Sjfv 2036171384Sjfv // Initialize signal semaphore 2037230775Sjfv ::SEM_INIT(sig_sem, 0); 2038230775Sjfv} 2039171384Sjfv 2040171384Sjfvvoid os::signal_notify(int sig) { 2041230775Sjfv Atomic::inc(&pending_signals[sig]); 2042230775Sjfv ::SEM_POST(sig_sem); 2043230775Sjfv} 2044230775Sjfv 2045230775Sjfvstatic int check_pending_signals(bool wait) { 2046230775Sjfv Atomic::store(0, &sigint_count); 2047230775Sjfv for (;;) { 2048171384Sjfv for (int i = 0; i < NSIG + 1; i++) { 2049238149Sjfv jint n = pending_signals[i]; 2050238149Sjfv if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2051238149Sjfv return i; 2052238149Sjfv } 2053230775Sjfv } 2054230775Sjfv if (!wait) { 2055230775Sjfv return -1; 2056230775Sjfv } 2057230775Sjfv JavaThread *thread = JavaThread::current(); 2058230775Sjfv ThreadBlockInVM tbivm(thread); 2059230775Sjfv 2060230775Sjfv bool threadIsSuspended; 2061230775Sjfv do { 2062230775Sjfv thread->set_suspend_equivalent(); 2063230775Sjfv // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2064230775Sjfv ::SEM_WAIT(sig_sem); 2065230775Sjfv 2066230775Sjfv // were we externally suspended while we were waiting? 2067230775Sjfv threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2068230775Sjfv if (threadIsSuspended) { 2069230775Sjfv // 2070230775Sjfv // The semaphore has been incremented, but while we were waiting 2071230775Sjfv // another thread suspended us. We don't want to continue running 2072230775Sjfv // while suspended because that would surprise the thread that 2073230775Sjfv // suspended us. 2074230775Sjfv // 2075230775Sjfv ::SEM_POST(sig_sem); 2076230775Sjfv 2077230775Sjfv thread->java_suspend_self(); 2078230775Sjfv } 2079230775Sjfv } while (threadIsSuspended); 2080230775Sjfv } 2081230775Sjfv} 2082230775Sjfv 2083230775Sjfvint os::signal_lookup() { 2084230775Sjfv return check_pending_signals(false); 2085230775Sjfv} 2086230775Sjfv 2087230775Sjfvint os::signal_wait() { 2088230775Sjfv return check_pending_signals(true); 2089179055Sjfv} 2090230775Sjfv 2091230775Sjfv//////////////////////////////////////////////////////////////////////////////// 2092230775Sjfv// Virtual Memory 2093230775Sjfv 2094230775Sjfvint os::vm_page_size() { 2095230775Sjfv // Seems redundant as all get out 2096238149Sjfv assert(os::Bsd::page_size() != -1, "must call os::init"); 2097230775Sjfv return os::Bsd::page_size(); 2098171384Sjfv} 2099171384Sjfv 2100230775Sjfv// Solaris allocates memory by pages. 2101230775Sjfvint os::vm_allocation_granularity() { 2102230775Sjfv assert(os::Bsd::page_size() != -1, "must call os::init"); 2103230775Sjfv return os::Bsd::page_size(); 2104230775Sjfv} 2105230775Sjfv 2106230775Sjfv// Rationale behind this function: 2107230775Sjfv// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable 2108230775Sjfv// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get 2109230775Sjfv// samples for JITted code. Here we create private executable mapping over the code cache 2110230775Sjfv// and then we can use standard (well, almost, as mapping can change) way to provide 2111230775Sjfv// info for the reporting script by storing timestamp and location of symbol 2112230775Sjfvvoid bsd_wrap_code(char* base, size_t size) { 2113230775Sjfv static volatile jint cnt = 0; 2114171384Sjfv 2115230775Sjfv if (!UseOprofile) { 2116230775Sjfv return; 2117230775Sjfv } 2118230775Sjfv 2119230775Sjfv char buf[PATH_MAX + 1]; 2120171384Sjfv int num = Atomic::add(1, &cnt); 2121230775Sjfv 2122171384Sjfv snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", 2123190873Sjfv os::get_temp_directory(), os::current_process_id(), num); 2124230775Sjfv unlink(buf); 2125230775Sjfv 2126230775Sjfv int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); 2127230775Sjfv 2128230775Sjfv if (fd != -1) { 2129190873Sjfv off_t rv = ::lseek(fd, size-2, SEEK_SET); 2130230775Sjfv if (rv != (off_t)-1) { 2131230775Sjfv if (::write(fd, "", 1) == 1) { 2132230775Sjfv mmap(base, size, 2133230775Sjfv PROT_READ|PROT_WRITE|PROT_EXEC, 2134230775Sjfv MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); 2135230775Sjfv } 2136230775Sjfv } 2137230775Sjfv ::close(fd); 2138230775Sjfv unlink(buf); 2139171384Sjfv } 2140230775Sjfv} 2141230775Sjfv 2142230775Sjfvstatic void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2143230775Sjfv int err) { 2144230775Sjfv warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2145190873Sjfv ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2146230775Sjfv strerror(err), err); 2147230775Sjfv} 2148230775Sjfv 2149230775Sjfv// NOTE: Bsd kernel does not really reserve the pages for us. 2150230775Sjfv// All it does is to check if there are enough free pages 2151230775Sjfv// left at the time of mmap(). This could be a potential 2152230775Sjfv// problem. 2153190873Sjfvbool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2154171384Sjfv int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2155230775Sjfv#ifdef __OpenBSD__ 2156230775Sjfv // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2157230775Sjfv if (::mprotect(addr, size, prot) == 0) { 2158230775Sjfv return true; 2159230775Sjfv } 2160230775Sjfv#else 2161230775Sjfv uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, 2162230775Sjfv MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 2163230775Sjfv if (res != (uintptr_t) MAP_FAILED) { 2164230775Sjfv return true; 2165230775Sjfv } 2166230775Sjfv#endif 2167230775Sjfv 2168230775Sjfv // Warn about any commit errors we see in non-product builds just 2169230775Sjfv // in case mmap() doesn't work as described on the man page. 2170230775Sjfv NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) 2171230775Sjfv 2172230775Sjfv return false; 2173230775Sjfv} 2174230775Sjfv 2175230775Sjfvbool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 2176230775Sjfv bool exec) { 2177230775Sjfv // alignment_hint is ignored on this OS 2178230775Sjfv return pd_commit_memory(addr, size, exec); 2179230775Sjfv} 2180230775Sjfv 2181230775Sjfvvoid os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2182230775Sjfv const char* mesg) { 2183230775Sjfv assert(mesg != NULL, "mesg must be specified"); 2184230775Sjfv if (!pd_commit_memory(addr, size, exec)) { 2185230775Sjfv // add extra info in product mode for vm_exit_out_of_memory(): 2186230775Sjfv PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2187230775Sjfv vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 2188230775Sjfv } 2189230775Sjfv} 2190230775Sjfv 2191230775Sjfvvoid os::pd_commit_memory_or_exit(char* addr, size_t size, 2192230775Sjfv size_t alignment_hint, bool exec, 2193230775Sjfv const char* mesg) { 2194230775Sjfv // alignment_hint is ignored on this OS 2195230775Sjfv pd_commit_memory_or_exit(addr, size, exec, mesg); 2196230775Sjfv} 2197230775Sjfv 2198230775Sjfvvoid os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2199230775Sjfv} 2200230775Sjfv 2201230775Sjfvvoid os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2202171384Sjfv ::madvise(addr, bytes, MADV_DONTNEED); 2203230775Sjfv} 2204230775Sjfv 2205230775Sjfvvoid os::numa_make_global(char *addr, size_t bytes) { 2206230775Sjfv} 2207230775Sjfv 2208230775Sjfvvoid os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2209230775Sjfv} 2210230775Sjfv 2211230775Sjfvbool os::numa_topology_changed() { return false; } 2212230775Sjfv 2213230775Sjfvsize_t os::numa_get_groups_num() { 2214230775Sjfv return 1; 2215185352Sjfv} 2216190873Sjfv 2217230775Sjfvint os::numa_get_group_id() { 2218230775Sjfv return 0; 2219230775Sjfv} 2220230775Sjfv 2221230775Sjfvsize_t os::numa_get_leaf_groups(int *ids, size_t size) { 2222190873Sjfv if (size > 0) { 2223171384Sjfv ids[0] = 0; 2224230775Sjfv return 1; 2225230775Sjfv } 2226230775Sjfv return 0; 2227230775Sjfv} 2228230775Sjfv 2229230775Sjfvbool os::get_page_info(char *start, page_info* info) { 2230230775Sjfv return false; 2231171384Sjfv} 2232230775Sjfv 2233171384Sjfvchar *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2234171384Sjfv return end; 2235230775Sjfv} 2236171384Sjfv 2237230775Sjfv 2238230775Sjfvbool os::pd_uncommit_memory(char* addr, size_t size) { 2239171384Sjfv#ifdef __OpenBSD__ 2240230775Sjfv // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD 2241230775Sjfv return ::mprotect(addr, size, PROT_NONE) == 0; 2242230775Sjfv#else 2243230775Sjfv uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, 2244230775Sjfv MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); 2245230775Sjfv return res != (uintptr_t) MAP_FAILED; 2246230775Sjfv#endif 2247230775Sjfv} 2248230775Sjfv 2249171384Sjfvbool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2250171384Sjfv return os::commit_memory(addr, size, !ExecMem); 2251230775Sjfv} 2252230775Sjfv 2253230775Sjfv// If this is a growable mapping, remove the guard pages entirely by 2254230775Sjfv// munmap()ping them. If not, just call uncommit_memory(). 2255230775Sjfvbool os::remove_stack_guard_pages(char* addr, size_t size) { 2256230775Sjfv return os::uncommit_memory(addr, size); 2257171384Sjfv} 2258230775Sjfv 2259230775Sjfvstatic address _highest_vm_reserved_address = NULL; 2260171384Sjfv 2261171384Sjfv// If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory 2262171384Sjfv// at 'requested_addr'. If there are existing memory mappings at the same 2263230775Sjfv// location, however, they will be overwritten. If 'fixed' is false, 2264230775Sjfv// 'requested_addr' is only treated as a hint, the return value may or 2265230775Sjfv// may not start from the requested address. Unlike Bsd mmap(), this 2266230775Sjfv// function returns NULL to indicate failure. 2267230775Sjfvstatic char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { 2268230775Sjfv char * addr; 2269230775Sjfv int flags; 2270230775Sjfv 2271230775Sjfv flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; 2272230775Sjfv if (fixed) { 2273230775Sjfv assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2274230775Sjfv flags |= MAP_FIXED; 2275230775Sjfv } 2276230775Sjfv 2277230775Sjfv // Map reserved/uncommitted pages PROT_NONE so we fail early if we 2278190873Sjfv // touch an uncommitted page. Otherwise, the read/write might 2279190873Sjfv // succeed if we have enough swap space to back the physical page. 2280230775Sjfv addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, 2281230775Sjfv flags, -1, 0); 2282230775Sjfv 2283230775Sjfv if (addr != MAP_FAILED) { 2284230775Sjfv // anon_mmap() should only get called during VM initialization, 2285190873Sjfv // don't need lock (actually we can skip locking even it can be called 2286171384Sjfv // from multiple threads, because _highest_vm_reserved_address is just a 2287171384Sjfv // hint about the upper limit of non-stack memory regions.) 2288230775Sjfv if ((address)addr + bytes > _highest_vm_reserved_address) { 2289230775Sjfv _highest_vm_reserved_address = (address)addr + bytes; 2290230775Sjfv } 2291230775Sjfv } 2292230775Sjfv 2293171384Sjfv return addr == MAP_FAILED ? NULL : addr; 2294171384Sjfv} 2295230775Sjfv 2296230775Sjfv// Don't update _highest_vm_reserved_address, because there might be memory 2297230775Sjfv// regions above addr + size. If so, releasing a memory region only creates 2298230775Sjfv// a hole in the address space, it doesn't help prevent heap-stack collision. 2299230775Sjfv// 2300171384Sjfvstatic int anon_munmap(char * addr, size_t size) { 2301230775Sjfv return ::munmap(addr, size) == 0; 2302230775Sjfv} 2303171384Sjfv 2304230775Sjfvchar* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2305171384Sjfv size_t alignment_hint) { 2306171384Sjfv return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); 2307230775Sjfv} 2308230775Sjfv 2309230775Sjfvbool os::pd_release_memory(char* addr, size_t size) { 2310171384Sjfv return anon_munmap(addr, size); 2311171384Sjfv} 2312230775Sjfv 2313230775Sjfvstatic bool bsd_mprotect(char* addr, size_t size, int prot) { 2314230775Sjfv // Bsd wants the mprotect address argument to be page aligned. 2315230775Sjfv char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); 2316171384Sjfv 2317194875Sjfv // According to SUSv3, mprotect() should only be used with mappings 2318230775Sjfv // established by mmap(), and mmap() always maps whole pages. Unaligned 2319230775Sjfv // 'addr' likely indicates problem in the VM (e.g. trying to change 2320230775Sjfv // protection of malloc'ed or statically allocated memory). Check the 2321230775Sjfv // caller if you hit this assert. 2322194875Sjfv assert(addr == bottom, "sanity check"); 2323190873Sjfv 2324179055Sjfv size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); 2325179055Sjfv return ::mprotect(bottom, size, prot) == 0; 2326190873Sjfv} 2327190873Sjfv 2328179055Sjfv// Set protections specified 2329190873Sjfvbool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2330190873Sjfv bool is_committed) { 2331179055Sjfv unsigned int p = 0; 2332179055Sjfv switch (prot) { 2333179055Sjfv case MEM_PROT_NONE: p = PROT_NONE; break; 2334185352Sjfv case MEM_PROT_READ: p = PROT_READ; break; 2335185352Sjfv case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2336185352Sjfv case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2337185352Sjfv default: 2338185352Sjfv ShouldNotReachHere(); 2339179055Sjfv } 2340185352Sjfv // is_committed is unused. 2341190873Sjfv return bsd_mprotect(addr, bytes, p); 2342230775Sjfv} 2343230775Sjfv 2344230775Sjfvbool os::guard_memory(char* addr, size_t size) { 2345230775Sjfv return bsd_mprotect(addr, size, PROT_NONE); 2346190873Sjfv} 2347179055Sjfv 2348190873Sjfvbool os::unguard_memory(char* addr, size_t size) { 2349230775Sjfv return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); 2350230775Sjfv} 2351230775Sjfv 2352230775Sjfvbool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { 2353230775Sjfv return false; 2354230775Sjfv} 2355230775Sjfv 2356230775Sjfv// Large page support 2357230775Sjfv 2358230775Sjfvstatic size_t _large_page_size = 0; 2359230775Sjfv 2360230775Sjfvvoid os::large_page_init() { 2361230775Sjfv} 2362190873Sjfv 2363230775Sjfv 2364230775Sjfvchar* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2365230775Sjfv fatal("This code is not used or maintained."); 2366230775Sjfv 2367230775Sjfv // "exec" is passed in but not used. Creating the shared image for 2368230775Sjfv // the code cache doesn't have an SHM_X executable permission to check. 2369230775Sjfv assert(UseLargePages && UseSHM, "only for SHM large pages"); 2370230775Sjfv 2371230775Sjfv key_t key = IPC_PRIVATE; 2372190873Sjfv char *addr; 2373230775Sjfv 2374230775Sjfv bool warn_on_failure = UseLargePages && 2375230775Sjfv (!FLAG_IS_DEFAULT(UseLargePages) || 2376230775Sjfv !FLAG_IS_DEFAULT(LargePageSizeInBytes) 2377230775Sjfv ); 2378230775Sjfv char msg[128]; 2379230775Sjfv 2380230775Sjfv // Create a large shared memory region to attach to based on size. 2381230775Sjfv // Currently, size is the total size of the heap 2382230775Sjfv int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); 2383230775Sjfv if (shmid == -1) { 2384230775Sjfv // Possible reasons for shmget failure: 2385230775Sjfv // 1. shmmax is too small for Java heap. 2386230775Sjfv // > check shmmax value: cat /proc/sys/kernel/shmmax 2387230775Sjfv // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax 2388230775Sjfv // 2. not enough large page memory. 2389230775Sjfv // > check available large pages: cat /proc/meminfo 2390230775Sjfv // > increase amount of large pages: 2391230775Sjfv // echo new_value > /proc/sys/vm/nr_hugepages 2392230775Sjfv // Note 1: different Bsd may use different name for this property, 2393190873Sjfv // e.g. on Redhat AS-3 it is "hugetlb_pool". 2394230775Sjfv // Note 2: it's possible there's enough physical memory available but 2395230775Sjfv // they are so fragmented after a long run that they can't 2396230775Sjfv // coalesce into large pages. Try to reserve large pages when 2397230775Sjfv // the system is still "fresh". 2398230775Sjfv if (warn_on_failure) { 2399230775Sjfv jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 2400230775Sjfv warning(msg); 2401230775Sjfv } 2402230775Sjfv return NULL; 2403230775Sjfv } 2404230775Sjfv 2405230775Sjfv // attach to the region 2406230775Sjfv addr = (char*)shmat(shmid, req_addr, 0); 2407230775Sjfv int err = errno; 2408230775Sjfv 2409230775Sjfv // Remove shmid. If shmat() is successful, the actual shared memory segment 2410230775Sjfv // will be deleted when it's detached by shmdt() or when the process 2411230775Sjfv // terminates. If shmat() is not successful this will remove the shared 2412230775Sjfv // segment immediately. 2413230775Sjfv shmctl(shmid, IPC_RMID, NULL); 2414230775Sjfv 2415230775Sjfv if ((intptr_t)addr == -1) { 2416190873Sjfv if (warn_on_failure) { 2417230775Sjfv jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 2418230775Sjfv warning(msg); 2419230775Sjfv } 2420251964Sjfv return NULL; 2421251964Sjfv } 2422251964Sjfv 2423251964Sjfv // The memory is committed 2424251964Sjfv MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); 2425251964Sjfv 2426251964Sjfv return addr; 2427251964Sjfv} 2428230775Sjfv 2429230775Sjfvbool os::release_memory_special(char* base, size_t bytes) { 2430230775Sjfv MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 2431230775Sjfv // detaching the SHM segment will also delete it, see reserve_memory_special() 2432230775Sjfv int rslt = shmdt(base); 2433230775Sjfv if (rslt == 0) { 2434230775Sjfv tkr.record((address)base, bytes); 2435230775Sjfv return true; 2436230775Sjfv } else { 2437230775Sjfv tkr.discard(); 2438230775Sjfv return false; 2439230775Sjfv } 2440230775Sjfv 2441230775Sjfv} 2442230775Sjfv 2443230775Sjfvsize_t os::large_page_size() { 2444230775Sjfv return _large_page_size; 2445230775Sjfv} 2446230775Sjfv 2447230775Sjfv// HugeTLBFS allows application to commit large page memory on demand; 2448230775Sjfv// with SysV SHM the entire memory region must be allocated as shared 2449230775Sjfv// memory. 2450230775Sjfvbool os::can_commit_large_page_memory() { 2451230775Sjfv return UseHugeTLBFS; 2452230775Sjfv} 2453230775Sjfv 2454230775Sjfvbool os::can_execute_large_page_memory() { 2455230775Sjfv return UseHugeTLBFS; 2456230775Sjfv} 2457230775Sjfv 2458230775Sjfv// Reserve memory at an arbitrary address, only if that area is 2459230775Sjfv// available (and not reserved for something else). 2460230775Sjfv 2461230775Sjfvchar* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2462230775Sjfv const int max_tries = 10; 2463230775Sjfv char* base[max_tries]; 2464230775Sjfv size_t size[max_tries]; 2465230775Sjfv const size_t gap = 0x000000; 2466171384Sjfv 2467171384Sjfv // Assert only that the size is a multiple of the page size, since 2468230775Sjfv // that's all that mmap requires, and since that's all we really know 2469171384Sjfv // about at this low abstraction level. If we need higher alignment, 2470179055Sjfv // we can either pass an alignment to this method or verify alignment 2471171384Sjfv // in one of the methods further up the call chain. See bug 5044738. 2472230775Sjfv assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2473230775Sjfv 2474230775Sjfv // Repeatedly allocate blocks until the block is allocated at the 2475171384Sjfv // right spot. Give up after max_tries. Note that reserve_memory() will 2476171384Sjfv // automatically update _highest_vm_reserved_address if the call is 2477171384Sjfv // successful. The variable tracks the highest memory address every reserved 2478179055Sjfv // by JVM. It is used to detect heap-stack collision if running with 2479171384Sjfv // fixed-stack BsdThreads. Because here we may attempt to reserve more 2480230775Sjfv // space than needed, it could confuse the collision detecting code. To 2481230775Sjfv // solve the problem, save current _highest_vm_reserved_address and 2482179055Sjfv // calculate the correct value before return. 2483171384Sjfv address old_highest = _highest_vm_reserved_address; 2484171384Sjfv 2485171384Sjfv // Bsd mmap allows caller to pass an address as hint; give it a try first, 2486171384Sjfv // if kernel honors the hint then we can return immediately. 2487171384Sjfv char * addr = anon_mmap(requested_addr, bytes, false); 2488171384Sjfv if (addr == requested_addr) { 2489171384Sjfv return requested_addr; 2490230775Sjfv } 2491179055Sjfv 2492179055Sjfv if (addr != NULL) { 2493171384Sjfv // mmap() is successful but it fails to reserve at the requested address 2494171384Sjfv anon_munmap(addr, bytes); 2495230775Sjfv } 2496179055Sjfv 2497179055Sjfv int i; 2498171384Sjfv for (i = 0; i < max_tries; ++i) { 2499171384Sjfv base[i] = reserve_memory(bytes); 2500171384Sjfv 2501171384Sjfv if (base[i] != NULL) { 2502171384Sjfv // Is this the block we wanted? 2503179055Sjfv if (base[i] == requested_addr) { 2504230775Sjfv size[i] = bytes; 2505230775Sjfv break; 2506230775Sjfv } 2507230775Sjfv 2508179055Sjfv // Does this overlap the block we wanted? Give back the overlapped 2509171384Sjfv // parts and try again. 2510171384Sjfv 2511171384Sjfv size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2512171384Sjfv if (top_overlap >= 0 && top_overlap < bytes) { 2513171384Sjfv unmap_memory(base[i], top_overlap); 2514179055Sjfv base[i] += top_overlap; 2515179055Sjfv size[i] = bytes - top_overlap; 2516171384Sjfv } else { 2517171384Sjfv size_t bottom_overlap = base[i] + bytes - requested_addr; 2518171384Sjfv if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2519179055Sjfv unmap_memory(requested_addr, bottom_overlap); 2520179055Sjfv size[i] = bytes - bottom_overlap; 2521179055Sjfv } else { 2522181003Sjfv size[i] = bytes; 2523181003Sjfv } 2524179055Sjfv } 2525171384Sjfv } 2526171384Sjfv } 2527179055Sjfv 2528171384Sjfv // Give back the unused reserved pieces. 2529179055Sjfv 2530179055Sjfv for (int j = 0; j < i; ++j) { 2531171384Sjfv if (base[j] != NULL) { 2532171384Sjfv unmap_memory(base[j], size[j]); 2533171384Sjfv } 2534171384Sjfv } 2535179055Sjfv 2536179055Sjfv if (i < max_tries) { 2537179055Sjfv _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); 2538171384Sjfv return requested_addr; 2539171384Sjfv } else { 2540171384Sjfv _highest_vm_reserved_address = old_highest; 2541171384Sjfv return NULL; 2542171384Sjfv } 2543171384Sjfv} 2544179055Sjfv 2545179055Sjfvsize_t os::read(int fd, void *buf, unsigned int nBytes) { 2546179055Sjfv RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); 2547179055Sjfv} 2548171384Sjfv 2549171384Sjfv// TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. 2550171384Sjfv// Solaris uses poll(), bsd uses park(). 2551230775Sjfv// Poll() is likely a better choice, assuming that Thread.interrupt() 2552230775Sjfv// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with 2553230775Sjfv// SIGSEGV, see 4355769. 2554230775Sjfv 2555230775Sjfvint os::sleep(Thread* thread, jlong millis, bool interruptible) { 2556230775Sjfv assert(thread == Thread::current(), "thread consistency check"); 2557230775Sjfv 2558230775Sjfv ParkEvent * const slp = thread->_SleepEvent ; 2559230775Sjfv slp->reset() ; 2560230775Sjfv OrderAccess::fence() ; 2561230775Sjfv 2562230775Sjfv if (interruptible) { 2563230775Sjfv jlong prevtime = javaTimeNanos(); 2564230775Sjfv 2565230775Sjfv for (;;) { 2566230775Sjfv if (os::is_interrupted(thread, true)) { 2567230775Sjfv return OS_INTRPT; 2568230775Sjfv } 2569230775Sjfv 2570230775Sjfv jlong newtime = javaTimeNanos(); 2571230775Sjfv 2572230775Sjfv if (newtime - prevtime < 0) { 2573230775Sjfv // time moving backwards, should only happen if no monotonic clock 2574230775Sjfv // not a guarantee() because JVM should not abort on kernel/glibc bugs 2575230775Sjfv assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2576230775Sjfv } else { 2577230775Sjfv millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2578230775Sjfv } 2579230775Sjfv 2580230775Sjfv if(millis <= 0) { 2581230775Sjfv return OS_OK; 2582230775Sjfv } 2583230775Sjfv 2584230775Sjfv prevtime = newtime; 2585230775Sjfv 2586230775Sjfv { 2587230775Sjfv assert(thread->is_Java_thread(), "sanity check"); 2588230775Sjfv JavaThread *jt = (JavaThread *) thread; 2589230775Sjfv ThreadBlockInVM tbivm(jt); 2590230775Sjfv OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 2591230775Sjfv 2592190873Sjfv jt->set_suspend_equivalent(); 2593190873Sjfv // cleared by handle_special_suspend_equivalent_condition() or 2594230775Sjfv // java_suspend_self() via check_and_wait_while_suspended() 2595230775Sjfv 2596230775Sjfv slp->park(millis); 2597230775Sjfv 2598230775Sjfv // were we externally suspended while we were waiting? 2599230775Sjfv jt->check_and_wait_while_suspended(); 2600230775Sjfv } 2601230775Sjfv } 2602230775Sjfv } else { 2603230775Sjfv OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 2604230775Sjfv jlong prevtime = javaTimeNanos(); 2605230775Sjfv 2606171384Sjfv for (;;) { 2607171384Sjfv // It'd be nice to avoid the back-to-back javaTimeNanos() calls on 2608171384Sjfv // the 1st iteration ... 2609171384Sjfv jlong newtime = javaTimeNanos(); 2610171384Sjfv 2611230775Sjfv if (newtime - prevtime < 0) { 2612230775Sjfv // time moving backwards, should only happen if no monotonic clock 2613230775Sjfv // not a guarantee() because JVM should not abort on kernel/glibc bugs 2614230775Sjfv assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); 2615230775Sjfv } else { 2616230775Sjfv millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; 2617230775Sjfv } 2618230775Sjfv 2619230775Sjfv if(millis <= 0) break ; 2620171384Sjfv 2621185352Sjfv prevtime = newtime; 2622185352Sjfv slp->park(millis); 2623230775Sjfv } 2624230775Sjfv return OS_OK ; 2625230775Sjfv } 2626230775Sjfv} 2627230775Sjfv 2628230775Sjfvint os::naked_sleep() { 2629230775Sjfv // %% make the sleep time an integer flag. for now use 1 millisec. 2630230775Sjfv return os::sleep(Thread::current(), 1, false); 2631230775Sjfv} 2632230775Sjfv 2633230775Sjfv// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2634230775Sjfvvoid os::infinite_sleep() { 2635230775Sjfv while (true) { // sleep forever ... 2636230775Sjfv ::sleep(100); // ... 100 seconds at a time 2637230775Sjfv } 2638238149Sjfv} 2639185352Sjfv 2640230775Sjfv// Used to convert frequent JVM_Yield() to nops 2641230775Sjfvbool os::dont_yield() { 2642230775Sjfv return DontYieldALot; 2643205720Sjfv} 2644230775Sjfv 2645238149Sjfvvoid os::yield() { 2646230775Sjfv sched_yield(); 2647215911Sjfv} 2648230775Sjfv 2649230775Sjfvos::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} 2650230775Sjfv 2651230775Sjfvvoid os::yield_all(int attempts) { 2652230775Sjfv // Yields to all threads, including threads with lower priorities 2653230775Sjfv // Threads on Bsd are all with same priority. The Solaris style 2654230775Sjfv // os::yield_all() with nanosleep(1ms) is not necessary. 2655230775Sjfv sched_yield(); 2656230775Sjfv} 2657230775Sjfv 2658230775Sjfv// Called from the tight loops to possibly influence time-sharing heuristics 2659230775Sjfvvoid os::loop_breaker(int attempts) { 2660230775Sjfv os::yield_all(attempts); 2661230775Sjfv} 2662230775Sjfv 2663230775Sjfv//////////////////////////////////////////////////////////////////////////////// 2664230775Sjfv// thread priority support 2665230775Sjfv 2666230775Sjfv// Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER 2667230775Sjfv// only supports dynamic priority, static priority must be zero. For real-time 2668230775Sjfv// applications, Bsd supports SCHED_RR which allows static priority (1-99). 2669230775Sjfv// However, for large multi-threaded applications, SCHED_RR is not only slower 2670230775Sjfv// than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out 2671230775Sjfv// of 5 runs - Sep 2005). 2672230775Sjfv// 2673230775Sjfv// The following code actually changes the niceness of kernel-thread/LWP. It 2674230775Sjfv// has an assumption that setpriority() only modifies one kernel-thread/LWP, 2675230775Sjfv// not the entire user process, and user level threads are 1:1 mapped to kernel 2676238149Sjfv// threads. It has always been the case, but could change in the future. For 2677238149Sjfv// this reason, the code should not be used as default (ThreadPriorityPolicy=0). 2678238149Sjfv// It is only used when ThreadPriorityPolicy=1 and requires root privilege. 2679238149Sjfv 2680238149Sjfv#if !defined(__APPLE__) 2681238149Sjfvint os::java_to_os_priority[CriticalPriority + 1] = { 2682238149Sjfv 19, // 0 Entry should never be used 2683238149Sjfv 2684230775Sjfv 0, // 1 MinPriority 2685230775Sjfv 3, // 2 2686238149Sjfv 6, // 3 2687238149Sjfv 2688238149Sjfv 10, // 4 2689238149Sjfv 15, // 5 NormPriority 2690238149Sjfv 18, // 6 2691238149Sjfv 2692238149Sjfv 21, // 7 2693238149Sjfv 25, // 8 2694230775Sjfv 28, // 9 NearMaxPriority 2695230775Sjfv 2696238149Sjfv 31, // 10 MaxPriority 2697238149Sjfv 2698238149Sjfv 31 // 11 CriticalPriority 2699238149Sjfv}; 2700238149Sjfv#else 2701230775Sjfv/* Using Mach high-level priority assignments */ 2702190873Sjfvint os::java_to_os_priority[CriticalPriority + 1] = { 2703230775Sjfv 0, // 0 Entry should never be used (MINPRI_USER) 2704230775Sjfv 2705185352Sjfv 27, // 1 MinPriority 2706215911Sjfv 28, // 2 2707230775Sjfv 29, // 3 2708230775Sjfv 2709230775Sjfv 30, // 4 2710230775Sjfv 31, // 5 NormPriority (BASEPRI_DEFAULT) 2711230775Sjfv 32, // 6 2712230775Sjfv 2713215911Sjfv 33, // 7 2714230775Sjfv 34, // 8 2715230775Sjfv 35, // 9 NearMaxPriority 2716230775Sjfv 2717230775Sjfv 36, // 10 MaxPriority 2718230775Sjfv 2719230775Sjfv 36 // 11 CriticalPriority 2720230775Sjfv}; 2721230775Sjfv#endif 2722215911Sjfv 2723190873Sjfvstatic int prio_init() { 2724190873Sjfv if (ThreadPriorityPolicy == 1) { 2725215911Sjfv // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 2726217593Sjfv // if effective uid is not root. Perhaps, a more elegant way of doing 2727217593Sjfv // this is to test CAP_SYS_NICE capability, but that will require libcap.so 2728190873Sjfv if (geteuid() != 0) { 2729230775Sjfv if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { 2730230775Sjfv warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); 2731230775Sjfv } 2732230775Sjfv ThreadPriorityPolicy = 0; 2733230775Sjfv } 2734230775Sjfv } 2735230775Sjfv if (UseCriticalJavaThreadPriority) { 2736230775Sjfv os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2737230775Sjfv } 2738190873Sjfv return 0; 2739215911Sjfv} 2740230775Sjfv 2741230775SjfvOSReturn os::set_native_priority(Thread* thread, int newpri) { 2742215911Sjfv if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; 2743215911Sjfv 2744215911Sjfv#ifdef __OpenBSD__ 2745215911Sjfv // OpenBSD pthread_setprio starves low priority threads 2746215911Sjfv return OS_OK; 2747215911Sjfv#elif defined(__FreeBSD__) 2748230775Sjfv int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); 2749215911Sjfv#elif defined(__APPLE__) || defined(__NetBSD__) 2750215911Sjfv struct sched_param sp; 2751190873Sjfv int policy; 2752190873Sjfv pthread_t self = pthread_self(); 2753217593Sjfv 2754217593Sjfv if (pthread_getschedparam(self, &policy, &sp) != 0) 2755217593Sjfv return OS_ERR; 2756217593Sjfv 2757217593Sjfv sp.sched_priority = newpri; 2758217593Sjfv if (pthread_setschedparam(self, policy, &sp) != 0) 2759217593Sjfv return OS_ERR; 2760217593Sjfv 2761217593Sjfv return OS_OK; 2762217593Sjfv#else 2763217593Sjfv int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); 2764217593Sjfv return (ret == 0) ? OS_OK : OS_ERR; 2765217593Sjfv#endif 2766217593Sjfv} 2767217593Sjfv 2768217593SjfvOSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2769217593Sjfv if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { 2770215911Sjfv *priority_ptr = java_to_os_priority[NormPriority]; 2771215911Sjfv return OS_OK; 2772215911Sjfv } 2773215911Sjfv 2774215911Sjfv errno = 0; 2775215911Sjfv#if defined(__OpenBSD__) || defined(__FreeBSD__) 2776230775Sjfv *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); 2777230775Sjfv#elif defined(__APPLE__) || defined(__NetBSD__) 2778230775Sjfv int policy; 2779215911Sjfv struct sched_param sp; 2780215911Sjfv 2781171384Sjfv pthread_getschedparam(pthread_self(), &policy, &sp); 2782171384Sjfv *priority_ptr = sp.sched_priority; 2783171384Sjfv#else 2784200239Sjfv *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); 2785171384Sjfv#endif 2786171384Sjfv return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); 2787171384Sjfv} 2788171384Sjfv 2789171384Sjfv// Hint to the underlying OS that a task switch would not be good. 2790171384Sjfv// Void return because it's a hint and can fail. 2791190873Sjfvvoid os::hint_no_preempt() {} 2792215911Sjfv 2793230775Sjfv//////////////////////////////////////////////////////////////////////////////// 2794230775Sjfv// suspend/resume support 2795171384Sjfv 2796171384Sjfv// the low-level signal-based suspend/resume support is a remnant from the 2797171384Sjfv// old VM-suspension that used to be for java-suspension, safepoints etc, 2798171384Sjfv// within hotspot. Now there is a single use-case for this: 2799171384Sjfv// - calling get_thread_pc() on the VMThread by the flat-profiler task 2800190873Sjfv// that runs in the watcher thread. 2801179055Sjfv// The remaining code is greatly simplified from the more general suspension 2802190873Sjfv// code that used to be used. 2803190873Sjfv// 2804171384Sjfv// The protocol is quite simple: 2805179055Sjfv// - suspend: 2806185352Sjfv// - sends a signal to the target thread 2807205720Sjfv// - polls the suspend state of the osthread using a yield loop 2808205720Sjfv// - target thread signal handler (SR_handler) sets suspend state 2809205720Sjfv// and blocks in sigsuspend until continued 2810185352Sjfv// - resume: 2811185352Sjfv// - sets target osthread state to continue 2812205720Sjfv// - sends signal to end the sigsuspend loop in the SR_handler 2813185352Sjfv// 2814190873Sjfv// Note that the SR_lock plays no role in this suspend/resume protocol. 2815190873Sjfv// 2816179055Sjfv 2817171384Sjfvstatic void resume_clear_context(OSThread *osthread) { 2818171384Sjfv osthread->set_ucontext(NULL); 2819185352Sjfv osthread->set_siginfo(NULL); 2820185352Sjfv} 2821185352Sjfv 2822185352Sjfvstatic void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2823185352Sjfv osthread->set_ucontext(context); 2824185352Sjfv osthread->set_siginfo(siginfo); 2825185352Sjfv} 2826185352Sjfv 2827230775Sjfv// 2828230775Sjfv// Handler function invoked when a thread's execution is suspended or 2829230775Sjfv// resumed. We have to be careful that only async-safe functions are 2830230775Sjfv// called here (Note: most pthread functions are not async safe and 2831185352Sjfv// should be avoided.) 2832185352Sjfv// 2833185352Sjfv// Note: sigwait() is a more natural fit than sigsuspend() from an 2834185352Sjfv// interface point of view, but sigwait() prevents the signal hander 2835185352Sjfv// from being run. libpthread would get very confused by not having 2836190873Sjfv// its signal handlers run and prevents sigwait()'s use with the 2837190873Sjfv// mutex granting granting signal. 2838190873Sjfv// 2839190873Sjfv// Currently only ever called on the VMThread or JavaThread 2840205720Sjfv// 2841205720Sjfvstatic void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2842215911Sjfv // Save and restore errno to avoid confusing native code with EINTR 2843215911Sjfv // after sigsuspend. 2844238149Sjfv int old_errno = errno; 2845238149Sjfv 2846185352Sjfv Thread* thread = Thread::current(); 2847185352Sjfv OSThread* osthread = thread->osthread(); 2848185352Sjfv assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2849185352Sjfv 2850171384Sjfv os::SuspendResume::State current = osthread->sr.state(); 2851171384Sjfv if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2852171384Sjfv suspend_save_context(osthread, siginfo, context); 2853247822Sjfv 2854171384Sjfv // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2855179055Sjfv os::SuspendResume::State state = osthread->sr.suspended(); 2856200239Sjfv if (state == os::SuspendResume::SR_SUSPENDED) { 2857179055Sjfv sigset_t suspend_set; // signals for sigsuspend() 2858171384Sjfv 2859171384Sjfv // get current set of blocked signals and unblock resume signal 2860171384Sjfv pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2861185352Sjfv sigdelset(&suspend_set, SR_signum); 2862171384Sjfv 2863171384Sjfv sr_semaphore.signal(); 2864171384Sjfv // wait here until we are resumed 2865171384Sjfv while (1) { 2866171384Sjfv sigsuspend(&suspend_set); 2867171384Sjfv 2868171384Sjfv os::SuspendResume::State result = osthread->sr.running(); 2869200239Sjfv if (result == os::SuspendResume::SR_RUNNING) { 2870200239Sjfv sr_semaphore.signal(); 2871200239Sjfv break; 2872200239Sjfv } else if (result != os::SuspendResume::SR_SUSPENDED) { 2873200239Sjfv ShouldNotReachHere(); 2874200239Sjfv } 2875200239Sjfv } 2876200239Sjfv 2877171384Sjfv } else if (state == os::SuspendResume::SR_RUNNING) { 2878171384Sjfv // request was cancelled, continue 2879171384Sjfv } else { 2880171384Sjfv ShouldNotReachHere(); 2881171384Sjfv } 2882171384Sjfv 2883171384Sjfv resume_clear_context(osthread); 2884171384Sjfv } else if (current == os::SuspendResume::SR_RUNNING) { 2885171384Sjfv // request was cancelled, continue 2886171384Sjfv } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2887171384Sjfv // ignore 2888230775Sjfv } else { 2889230775Sjfv // ignore 2890230775Sjfv } 2891230775Sjfv 2892230775Sjfv errno = old_errno; 2893230775Sjfv} 2894230775Sjfv 2895230775Sjfv 2896238149Sjfvstatic int SR_initialize() { 2897171384Sjfv struct sigaction act; 2898171384Sjfv char *s; 2899171384Sjfv /* Get signal number to use for suspend/resume */ 2900171384Sjfv if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2901171384Sjfv int sig = ::strtol(s, 0, 10); 2902230775Sjfv if (sig > 0 || sig < NSIG) { 2903230775Sjfv SR_signum = sig; 2904230775Sjfv } 2905230775Sjfv } 2906230775Sjfv 2907230775Sjfv assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2908230775Sjfv "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2909171384Sjfv 2910171384Sjfv sigemptyset(&SR_sigset); 2911171384Sjfv sigaddset(&SR_sigset, SR_signum); 2912171384Sjfv 2913171384Sjfv /* Set up signal handler for suspend/resume */ 2914171384Sjfv act.sa_flags = SA_RESTART|SA_SIGINFO; 2915171384Sjfv act.sa_handler = (void (*)(int)) SR_handler; 2916179055Sjfv 2917179055Sjfv // SR_signum is blocked by default. 2918171384Sjfv // 4528190 - We also need to block pthread restart signal (32 on all 2919171384Sjfv // supported Bsd platforms). Note that BsdThreads need to block 2920171384Sjfv // this signal for all threads to work properly. So we don't have 2921171384Sjfv // to use hard-coded signal number when setting up the mask. 2922171384Sjfv pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2923171384Sjfv 2924171384Sjfv if (sigaction(SR_signum, &act, 0) == -1) { 2925185352Sjfv return -1; 2926185352Sjfv } 2927190873Sjfv 2928171384Sjfv // Save signal flag 2929171384Sjfv os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); 2930171384Sjfv return 0; 2931171384Sjfv} 2932230775Sjfv 2933238149Sjfvstatic int sr_notify(OSThread* osthread) { 2934171384Sjfv int status = pthread_kill(osthread->pthread_id(), SR_signum); 2935171384Sjfv assert_status(status == 0, status, "pthread_kill"); 2936171384Sjfv return status; 2937190873Sjfv} 2938190873Sjfv 2939185352Sjfv// "Randomly" selected value for how long we want to spin 2940185352Sjfv// before bailing out on suspending a thread, also how often 2941171384Sjfv// we send a signal to a thread we want to resume 2942171384Sjfvstatic const int RANDOMLY_LARGE_INTEGER = 1000000; 2943171384Sjfvstatic const int RANDOMLY_LARGE_INTEGER2 = 100; 2944171384Sjfv 2945171384Sjfv// returns true on success and false on error - really an error is fatal 2946171384Sjfv// but this seems the normal response to library errors 2947171384Sjfvstatic bool do_suspend(OSThread* osthread) { 2948171384Sjfv assert(osthread->sr.is_running(), "thread should be running"); 2949171384Sjfv assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 2950171384Sjfv 2951171384Sjfv // mark as suspended and send signal 2952171384Sjfv if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2953171384Sjfv // failed to switch, state wasn't running? 2954171384Sjfv ShouldNotReachHere(); 2955171384Sjfv return false; 2956171384Sjfv } 2957171384Sjfv 2958171384Sjfv if (sr_notify(osthread) != 0) { 2959171384Sjfv ShouldNotReachHere(); 2960171384Sjfv } 2961171384Sjfv 2962171384Sjfv // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2963171384Sjfv while (true) { 2964171384Sjfv if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2965171384Sjfv break; 2966171384Sjfv } else { 2967171384Sjfv // timeout 2968171384Sjfv os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2969171384Sjfv if (cancelled == os::SuspendResume::SR_RUNNING) { 2970171384Sjfv return false; 2971171384Sjfv } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2972171384Sjfv // make sure that we consume the signal on the semaphore as well 2973171384Sjfv sr_semaphore.wait(); 2974171384Sjfv break; 2975171384Sjfv } else { 2976171384Sjfv ShouldNotReachHere(); 2977171384Sjfv return false; 2978171384Sjfv } 2979171384Sjfv } 2980171384Sjfv } 2981171384Sjfv 2982171384Sjfv guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2983171384Sjfv return true; 2984171384Sjfv} 2985171384Sjfv 2986171384Sjfvstatic void do_resume(OSThread* osthread) { 2987171384Sjfv assert(osthread->sr.is_suspended(), "thread should be suspended"); 2988171384Sjfv assert(!sr_semaphore.trywait(), "invalid semaphore state"); 2989171384Sjfv 2990171384Sjfv if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2991171384Sjfv // failed to switch to WAKEUP_REQUEST 2992171384Sjfv ShouldNotReachHere(); 2993171384Sjfv return; 2994171384Sjfv } 2995171384Sjfv 2996171384Sjfv while (true) { 2997171384Sjfv if (sr_notify(osthread) == 0) { 2998190873Sjfv if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 2999190873Sjfv if (osthread->sr.is_running()) { 3000190873Sjfv return; 3001190873Sjfv } 3002190873Sjfv } 3003190873Sjfv } else { 3004190873Sjfv ShouldNotReachHere(); 3005190873Sjfv } 3006190873Sjfv } 3007190873Sjfv 3008190873Sjfv guarantee(osthread->sr.is_running(), "Must be running!"); 3009190873Sjfv} 3010190873Sjfv 3011190873Sjfv//////////////////////////////////////////////////////////////////////////////// 3012190873Sjfv// interrupt support 3013230775Sjfv 3014230775Sjfvvoid os::interrupt(Thread* thread) { 3015230775Sjfv assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3016230775Sjfv "possibility of dangling Thread pointer"); 3017230775Sjfv 3018230775Sjfv OSThread* osthread = thread->osthread(); 3019230775Sjfv 3020230775Sjfv if (!osthread->interrupted()) { 3021171384Sjfv osthread->set_interrupted(true); 3022171384Sjfv // More than one thread can get here with the same value of osthread, 3023171384Sjfv // resulting in multiple notifications. We do, however, want the store 3024171384Sjfv // to interrupted() to be visible to other threads before we execute unpark(). 3025171384Sjfv OrderAccess::fence(); 3026179055Sjfv ParkEvent * const slp = thread->_SleepEvent ; 3027179055Sjfv if (slp != NULL) slp->unpark() ; 3028230775Sjfv } 3029179055Sjfv 3030171384Sjfv // For JSR166. Unpark even if interrupt status already was set 3031179055Sjfv if (thread->is_Java_thread()) 3032179055Sjfv ((JavaThread*)thread)->parker()->unpark(); 3033179055Sjfv 3034230775Sjfv ParkEvent * ev = thread->_ParkEvent ; 3035179055Sjfv if (ev != NULL) ev->unpark() ; 3036230775Sjfv 3037179055Sjfv} 3038179055Sjfv 3039200239Sjfvbool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3040179055Sjfv assert(Thread::current() == thread || Threads_lock->owned_by_self(), 3041171384Sjfv "possibility of dangling Thread pointer"); 3042179055Sjfv 3043179055Sjfv OSThread* osthread = thread->osthread(); 3044179055Sjfv 3045179055Sjfv bool interrupted = osthread->interrupted(); 3046179055Sjfv 3047205720Sjfv if (interrupted && clear_interrupted) { 3048179055Sjfv osthread->set_interrupted(false); 3049185352Sjfv // consider thread->_SleepEvent->reset() ... optional optimization 3050179055Sjfv } 3051190873Sjfv 3052190873Sjfv return interrupted; 3053190873Sjfv} 3054200239Sjfv 3055215911Sjfv/////////////////////////////////////////////////////////////////////////////////// 3056179055Sjfv// signal handling (except suspend/resume) 3057179055Sjfv 3058185352Sjfv// This routine may be used by user applications as a "hook" to catch signals. 3059179055Sjfv// The user-defined signal handler must pass unrecognized signals to this 3060179055Sjfv// routine, and if it returns true (non-zero), then the signal handler must 3061190873Sjfv// return immediately. If the flag "abort_if_unrecognized" is true, then this 3062190873Sjfv// routine will never retun false (zero), but instead will execute a VM panic 3063230775Sjfv// routine kill the process. 3064230775Sjfv// 3065194875Sjfv// If this routine returns false, it is OK to call it again. This allows 3066194875Sjfv// the user-defined signal handler to perform checks either before or after 3067179055Sjfv// the VM performs its own checks. Naturally, the user code would be making 3068171384Sjfv// a serious error if it tried to handle an exception (such as a null check 3069215911Sjfv// or breakpoint) that the VM was generating for its own correct operation. 3070215911Sjfv// 3071215911Sjfv// This routine may recognize any of the following kinds of signals: 3072247822Sjfv// SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 3073179055Sjfv// It should be consulted by handlers for any of those signals. 3074179055Sjfv// 3075230775Sjfv// The caller of this routine must pass in the three arguments supplied 3076171384Sjfv// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3077230775Sjfv// field of the structure passed to sigaction(). This routine assumes that 3078230775Sjfv// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3079230775Sjfv// 3080171384Sjfv// Note that the VM will print warnings if it detects conflicting signal 3081179055Sjfv// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3082179055Sjfv// 3083179055Sjfvextern "C" JNIEXPORT int 3084179055SjfvJVM_handle_bsd_signal(int signo, siginfo_t* siginfo, 3085171384Sjfv void* ucontext, int abort_if_unrecognized); 3086171384Sjfv 3087179055Sjfvvoid signalHandler(int sig, siginfo_t* info, void* uc) { 3088230775Sjfv assert(info != NULL && uc != NULL, "it must be old kernel"); 3089181003Sjfv int orig_errno = errno; // Preserve errno value over signal handler. 3090190873Sjfv JVM_handle_bsd_signal(sig, info, uc, true); 3091179055Sjfv errno = orig_errno; 3092238149Sjfv} 3093181003Sjfv 3094179055Sjfv 3095179055Sjfv// This boolean allows users to forward their own non-matching signals 3096230775Sjfv// to JVM_handle_bsd_signal, harmlessly. 3097179055Sjfvbool os::Bsd::signal_handlers_are_installed = false; 3098230775Sjfv 3099179055Sjfv// For signal-chaining 3100179055Sjfvstruct sigaction os::Bsd::sigact[MAXSIGNUM]; 3101179055Sjfvunsigned int os::Bsd::sigs = 0; 3102179055Sjfvbool os::Bsd::libjsig_is_loaded = false; 3103230775Sjfvtypedef struct sigaction *(*get_signal_t)(int); 3104181003Sjfvget_signal_t os::Bsd::get_signal_action = NULL; 3105215911Sjfv 3106215911Sjfvstruct sigaction* os::Bsd::get_chained_signal_action(int sig) { 3107171384Sjfv struct sigaction *actp = NULL; 3108171384Sjfv 3109238149Sjfv if (libjsig_is_loaded) { 3110230775Sjfv // Retrieve the old signal handler from libjsig 3111230775Sjfv actp = (*get_signal_action)(sig); 3112230775Sjfv } 3113251964Sjfv if (actp == NULL) { 3114251964Sjfv // Retrieve the preinstalled signal handler from jvm 3115251964Sjfv actp = get_preinstalled_handler(sig); 3116251964Sjfv } 3117171384Sjfv 3118171384Sjfv return actp; 3119179055Sjfv} 3120179055Sjfv 3121185352Sjfvstatic bool call_chained_handler(struct sigaction *actp, int sig, 3122190873Sjfv siginfo_t *siginfo, void *context) { 3123179055Sjfv // Call the old signal handler 3124179055Sjfv if (actp->sa_handler == SIG_DFL) { 3125179055Sjfv // It's more reasonable to let jvm treat it as an unexpected exception 3126251964Sjfv // instead of taking the default action. 3127251964Sjfv return false; 3128179055Sjfv } else if (actp->sa_handler != SIG_IGN) { 3129247822Sjfv if ((actp->sa_flags & SA_NODEFER) == 0) { 3130179055Sjfv // automaticlly block the signal 3131179055Sjfv sigaddset(&(actp->sa_mask), sig); 3132185352Sjfv } 3133185352Sjfv 3134247822Sjfv sa_handler_t hand; 3135185352Sjfv sa_sigaction_t sa; 3136185352Sjfv bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3137190873Sjfv // retrieve the chained handler 3138205720Sjfv if (siginfo_flag_set) { 3139179055Sjfv sa = actp->sa_sigaction; 3140179055Sjfv } else { 3141179055Sjfv hand = actp->sa_handler; 3142230775Sjfv } 3143230775Sjfv 3144230775Sjfv if ((actp->sa_flags & SA_RESETHAND) != 0) { 3145230775Sjfv actp->sa_handler = SIG_DFL; 3146230775Sjfv } 3147230775Sjfv 3148179055Sjfv // try to honor the signal mask 3149179055Sjfv sigset_t oset; 3150205720Sjfv pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3151171384Sjfv 3152230775Sjfv // call into the chained handler 3153230775Sjfv if (siginfo_flag_set) { 3154230775Sjfv (*sa)(sig, siginfo, context); 3155230775Sjfv } else { 3156230775Sjfv (*hand)(sig); 3157200239Sjfv } 3158230775Sjfv 3159200239Sjfv // restore the signal mask 3160230775Sjfv pthread_sigmask(SIG_SETMASK, &oset, 0); 3161215911Sjfv } 3162230775Sjfv // Tell jvm's signal handler the signal is taken care of. 3163230775Sjfv return true; 3164230775Sjfv} 3165230775Sjfv 3166230775Sjfvbool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3167230775Sjfv bool chained = false; 3168230775Sjfv // signal-chaining 3169230775Sjfv if (UseSignalChaining) { 3170230775Sjfv struct sigaction *actp = get_chained_signal_action(sig); 3171230775Sjfv if (actp != NULL) { 3172247822Sjfv chained = call_chained_handler(actp, sig, siginfo, context); 3173238149Sjfv } 3174247822Sjfv } 3175238149Sjfv return chained; 3176238149Sjfv} 3177230775Sjfv 3178230775Sjfvstruct sigaction* os::Bsd::get_preinstalled_handler(int sig) { 3179230775Sjfv if ((( (unsigned int)1 << sig ) & sigs) != 0) { 3180230775Sjfv return &sigact[sig]; 3181171384Sjfv } 3182171384Sjfv return NULL; 3183171384Sjfv} 3184230775Sjfv 3185230775Sjfvvoid os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3186230775Sjfv assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3187230775Sjfv sigact[sig] = oldAct; 3188230775Sjfv sigs |= (unsigned int)1 << sig; 3189230775Sjfv} 3190230775Sjfv 3191230775Sjfv// for diagnostic 3192230775Sjfvint os::Bsd::sigflags[MAXSIGNUM]; 3193230775Sjfv 3194230775Sjfvint os::Bsd::get_our_sigflags(int sig) { 3195230775Sjfv assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3196230775Sjfv return sigflags[sig]; 3197230775Sjfv} 3198171384Sjfv 3199171384Sjfvvoid os::Bsd::set_our_sigflags(int sig, int flags) { 3200215911Sjfv assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3201215911Sjfv sigflags[sig] = flags; 3202215911Sjfv} 3203215911Sjfv 3204215911Sjfvvoid os::Bsd::set_signal_handler(int sig, bool set_installed) { 3205215911Sjfv // Check for overwrite. 3206215911Sjfv struct sigaction oldAct; 3207215911Sjfv sigaction(sig, (struct sigaction*)NULL, &oldAct); 3208215911Sjfv 3209215911Sjfv void* oldhand = oldAct.sa_sigaction 3210215911Sjfv ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3211215911Sjfv : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3212215911Sjfv if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3213215911Sjfv oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3214215911Sjfv oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { 3215215911Sjfv if (AllowUserSignalHandlers || !set_installed) { 3216215911Sjfv // Do not overwrite; user takes responsibility to forward to us. 3217215911Sjfv return; 3218215911Sjfv } else if (UseSignalChaining) { 3219215911Sjfv // save the old handler in jvm 3220215911Sjfv save_preinstalled_handler(sig, oldAct); 3221215911Sjfv // libjsig also interposes the sigaction() call below and saves the 3222215911Sjfv // old sigaction on it own. 3223215911Sjfv } else { 3224215911Sjfv fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 3225215911Sjfv "%#lx for signal %d.", (long)oldhand, sig)); 3226215911Sjfv } 3227215911Sjfv } 3228215911Sjfv 3229215911Sjfv struct sigaction sigAct; 3230215911Sjfv sigfillset(&(sigAct.sa_mask)); 3231171384Sjfv sigAct.sa_handler = SIG_DFL; 3232230775Sjfv if (!set_installed) { 3233230775Sjfv sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3234230775Sjfv } else { 3235230775Sjfv sigAct.sa_sigaction = signalHandler; 3236230775Sjfv sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3237230775Sjfv } 3238230775Sjfv#if __APPLE__ 3239230775Sjfv // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV 3240230775Sjfv // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" 3241230775Sjfv // if the signal handler declares it will handle it on alternate stack. 3242230775Sjfv // Notice we only declare we will handle it on alt stack, but we are not 3243230775Sjfv // actually going to use real alt stack - this is just a workaround. 3244230775Sjfv // Please see ux_exception.c, method catch_mach_exception_raise for details 3245230775Sjfv // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c 3246230775Sjfv if (sig == SIGSEGV) { 3247247822Sjfv sigAct.sa_flags |= SA_ONSTACK; 3248230775Sjfv } 3249238149Sjfv#endif 3250251964Sjfv 3251251964Sjfv // Save flags, which are set by ours 3252171384Sjfv assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); 3253171384Sjfv sigflags[sig] = sigAct.sa_flags; 3254171384Sjfv 3255230775Sjfv int ret = sigaction(sig, &sigAct, &oldAct); 3256171384Sjfv assert(ret == 0, "check"); 3257194875Sjfv 3258171384Sjfv void* oldhand2 = oldAct.sa_sigaction 3259230775Sjfv ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3260230775Sjfv : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3261230775Sjfv assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3262230775Sjfv} 3263230775Sjfv 3264230775Sjfv// install signal handlers for signals that HotSpot needs to 3265230775Sjfv// handle in order to support Java-level exception handling. 3266230775Sjfv 3267230775Sjfvvoid os::Bsd::install_signal_handlers() { 3268230775Sjfv if (!signal_handlers_are_installed) { 3269230775Sjfv signal_handlers_are_installed = true; 3270230775Sjfv 3271230775Sjfv // signal-chaining 3272230775Sjfv typedef void (*signal_setting_t)(); 3273230775Sjfv signal_setting_t begin_signal_setting = NULL; 3274230775Sjfv signal_setting_t end_signal_setting = NULL; 3275230775Sjfv begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3276230775Sjfv dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3277230775Sjfv if (begin_signal_setting != NULL) { 3278230775Sjfv end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3279230775Sjfv dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3280230775Sjfv get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3281230775Sjfv dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3282230775Sjfv libjsig_is_loaded = true; 3283230775Sjfv assert(UseSignalChaining, "should enable signal-chaining"); 3284230775Sjfv } 3285230775Sjfv if (libjsig_is_loaded) { 3286230775Sjfv // Tell libjsig jvm is setting signal handlers 3287230775Sjfv (*begin_signal_setting)(); 3288230775Sjfv } 3289230775Sjfv 3290230775Sjfv set_signal_handler(SIGSEGV, true); 3291230775Sjfv set_signal_handler(SIGPIPE, true); 3292230775Sjfv set_signal_handler(SIGBUS, true); 3293247822Sjfv set_signal_handler(SIGILL, true); 3294251964Sjfv set_signal_handler(SIGFPE, true); 3295171384Sjfv set_signal_handler(SIGXFSZ, true); 3296230775Sjfv 3297171384Sjfv#if defined(__APPLE__) 3298171384Sjfv // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including 3299 // signals caught and handled by the JVM. To work around this, we reset the mach task 3300 // signal handler that's placed on our process by CrashReporter. This disables 3301 // CrashReporter-based reporting. 3302 // 3303 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes 3304 // on caught fatal signals. 3305 // 3306 // Additionally, gdb installs both standard BSD signal handlers, and mach exception 3307 // handlers. By replacing the existing task exception handler, we disable gdb's mach 3308 // exception handling, while leaving the standard BSD signal handlers functional. 3309 kern_return_t kr; 3310 kr = task_set_exception_ports(mach_task_self(), 3311 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, 3312 MACH_PORT_NULL, 3313 EXCEPTION_STATE_IDENTITY, 3314 MACHINE_THREAD_STATE); 3315 3316 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); 3317#endif 3318 3319 if (libjsig_is_loaded) { 3320 // Tell libjsig jvm finishes setting signal handlers 3321 (*end_signal_setting)(); 3322 } 3323 3324 // We don't activate signal checker if libjsig is in place, we trust ourselves 3325 // and if UserSignalHandler is installed all bets are off 3326 if (CheckJNICalls) { 3327 if (libjsig_is_loaded) { 3328 if (PrintJNIResolving) { 3329 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3330 } 3331 check_signals = false; 3332 } 3333 if (AllowUserSignalHandlers) { 3334 if (PrintJNIResolving) { 3335 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3336 } 3337 check_signals = false; 3338 } 3339 } 3340 } 3341} 3342 3343 3344///// 3345// glibc on Bsd platform uses non-documented flag 3346// to indicate, that some special sort of signal 3347// trampoline is used. 3348// We will never set this flag, and we should 3349// ignore this flag in our diagnostic 3350#ifdef SIGNIFICANT_SIGNAL_MASK 3351#undef SIGNIFICANT_SIGNAL_MASK 3352#endif 3353#define SIGNIFICANT_SIGNAL_MASK (~0x04000000) 3354 3355static const char* get_signal_handler_name(address handler, 3356 char* buf, int buflen) { 3357 int offset; 3358 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3359 if (found) { 3360 // skip directory names 3361 const char *p1, *p2; 3362 p1 = buf; 3363 size_t len = strlen(os::file_separator()); 3364 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3365 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 3366 } else { 3367 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3368 } 3369 return buf; 3370} 3371 3372static void print_signal_handler(outputStream* st, int sig, 3373 char* buf, size_t buflen) { 3374 struct sigaction sa; 3375 3376 sigaction(sig, NULL, &sa); 3377 3378 // See comment for SIGNIFICANT_SIGNAL_MASK define 3379 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3380 3381 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3382 3383 address handler = (sa.sa_flags & SA_SIGINFO) 3384 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3385 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3386 3387 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3388 st->print("SIG_DFL"); 3389 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3390 st->print("SIG_IGN"); 3391 } else { 3392 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3393 } 3394 3395 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 3396 3397 address rh = VMError::get_resetted_sighandler(sig); 3398 // May be, handler was resetted by VMError? 3399 if(rh != NULL) { 3400 handler = rh; 3401 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; 3402 } 3403 3404 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 3405 3406 // Check: is it our handler? 3407 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || 3408 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3409 // It is our signal handler 3410 // check for flags, reset system-used one! 3411 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3412 st->print( 3413 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3414 os::Bsd::get_our_sigflags(sig)); 3415 } 3416 } 3417 st->cr(); 3418} 3419 3420 3421#define DO_SIGNAL_CHECK(sig) \ 3422 if (!sigismember(&check_signal_done, sig)) \ 3423 os::Bsd::check_signal_handler(sig) 3424 3425// This method is a periodic task to check for misbehaving JNI applications 3426// under CheckJNI, we can add any periodic checks here 3427 3428void os::run_periodic_checks() { 3429 3430 if (check_signals == false) return; 3431 3432 // SEGV and BUS if overridden could potentially prevent 3433 // generation of hs*.log in the event of a crash, debugging 3434 // such a case can be very challenging, so we absolutely 3435 // check the following for a good measure: 3436 DO_SIGNAL_CHECK(SIGSEGV); 3437 DO_SIGNAL_CHECK(SIGILL); 3438 DO_SIGNAL_CHECK(SIGFPE); 3439 DO_SIGNAL_CHECK(SIGBUS); 3440 DO_SIGNAL_CHECK(SIGPIPE); 3441 DO_SIGNAL_CHECK(SIGXFSZ); 3442 3443 3444 // ReduceSignalUsage allows the user to override these handlers 3445 // see comments at the very top and jvm_solaris.h 3446 if (!ReduceSignalUsage) { 3447 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3448 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3449 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3450 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3451 } 3452 3453 DO_SIGNAL_CHECK(SR_signum); 3454 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); 3455} 3456 3457typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3458 3459static os_sigaction_t os_sigaction = NULL; 3460 3461void os::Bsd::check_signal_handler(int sig) { 3462 char buf[O_BUFLEN]; 3463 address jvmHandler = NULL; 3464 3465 3466 struct sigaction act; 3467 if (os_sigaction == NULL) { 3468 // only trust the default sigaction, in case it has been interposed 3469 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3470 if (os_sigaction == NULL) return; 3471 } 3472 3473 os_sigaction(sig, (struct sigaction*)NULL, &act); 3474 3475 3476 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; 3477 3478 address thisHandler = (act.sa_flags & SA_SIGINFO) 3479 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3480 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 3481 3482 3483 switch(sig) { 3484 case SIGSEGV: 3485 case SIGBUS: 3486 case SIGFPE: 3487 case SIGPIPE: 3488 case SIGILL: 3489 case SIGXFSZ: 3490 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); 3491 break; 3492 3493 case SHUTDOWN1_SIGNAL: 3494 case SHUTDOWN2_SIGNAL: 3495 case SHUTDOWN3_SIGNAL: 3496 case BREAK_SIGNAL: 3497 jvmHandler = (address)user_handler(); 3498 break; 3499 3500 case INTERRUPT_SIGNAL: 3501 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); 3502 break; 3503 3504 default: 3505 if (sig == SR_signum) { 3506 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3507 } else { 3508 return; 3509 } 3510 break; 3511 } 3512 3513 if (thisHandler != jvmHandler) { 3514 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3515 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3516 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3517 // No need to check this sig any longer 3518 sigaddset(&check_signal_done, sig); 3519 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { 3520 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3521 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); 3522 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 3523 // No need to check this sig any longer 3524 sigaddset(&check_signal_done, sig); 3525 } 3526 3527 // Dump all the signal 3528 if (sigismember(&check_signal_done, sig)) { 3529 print_signal_handlers(tty, buf, O_BUFLEN); 3530 } 3531} 3532 3533extern void report_error(char* file_name, int line_no, char* title, char* format, ...); 3534 3535extern bool signal_name(int signo, char* buf, size_t len); 3536 3537const char* os::exception_name(int exception_code, char* buf, size_t size) { 3538 if (0 < exception_code && exception_code <= SIGRTMAX) { 3539 // signal 3540 if (!signal_name(exception_code, buf, size)) { 3541 jio_snprintf(buf, size, "SIG%d", exception_code); 3542 } 3543 return buf; 3544 } else { 3545 return NULL; 3546 } 3547} 3548 3549// this is called _before_ the most of global arguments have been parsed 3550void os::init(void) { 3551 char dummy; /* used to get a guess on initial stack address */ 3552// first_hrtime = gethrtime(); 3553 3554 // With BsdThreads the JavaMain thread pid (primordial thread) 3555 // is different than the pid of the java launcher thread. 3556 // So, on Bsd, the launcher thread pid is passed to the VM 3557 // via the sun.java.launcher.pid property. 3558 // Use this property instead of getpid() if it was correctly passed. 3559 // See bug 6351349. 3560 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); 3561 3562 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); 3563 3564 clock_tics_per_sec = CLK_TCK; 3565 3566 init_random(1234567); 3567 3568 ThreadCritical::initialize(); 3569 3570 Bsd::set_page_size(getpagesize()); 3571 if (Bsd::page_size() == -1) { 3572 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", 3573 strerror(errno))); 3574 } 3575 init_page_sizes((size_t) Bsd::page_size()); 3576 3577 Bsd::initialize_system_info(); 3578 3579 // main_thread points to the aboriginal thread 3580 Bsd::_main_thread = pthread_self(); 3581 3582 Bsd::clock_init(); 3583 initial_time_count = javaTimeNanos(); 3584 3585#ifdef __APPLE__ 3586 // XXXDARWIN 3587 // Work around the unaligned VM callbacks in hotspot's 3588 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on 3589 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces 3590 // alignment when doing symbol lookup. To work around this, we force early 3591 // binding of all symbols now, thus binding when alignment is known-good. 3592 _dyld_bind_fully_image_containing_address((const void *) &os::init); 3593#endif 3594} 3595 3596// To install functions for atexit system call 3597extern "C" { 3598 static void perfMemory_exit_helper() { 3599 perfMemory_exit(); 3600 } 3601} 3602 3603// this is called _after_ the global arguments have been parsed 3604jint os::init_2(void) 3605{ 3606 // Allocate a single page and mark it as readable for safepoint polling 3607 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3608 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); 3609 3610 os::set_polling_page( polling_page ); 3611 3612#ifndef PRODUCT 3613 if(Verbose && PrintMiscellaneous) 3614 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3615#endif 3616 3617 if (!UseMembar) { 3618 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 3619 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); 3620 os::set_memory_serialize_page( mem_serialize_page ); 3621 3622#ifndef PRODUCT 3623 if(Verbose && PrintMiscellaneous) 3624 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3625#endif 3626 } 3627 3628 // initialize suspend/resume support - must do this before signal_sets_init() 3629 if (SR_initialize() != 0) { 3630 perror("SR_initialize failed"); 3631 return JNI_ERR; 3632 } 3633 3634 Bsd::signal_sets_init(); 3635 Bsd::install_signal_handlers(); 3636 3637 // Check minimum allowable stack size for thread creation and to initialize 3638 // the java system classes, including StackOverflowError - depends on page 3639 // size. Add a page for compiler2 recursion in main thread. 3640 // Add in 2*BytesPerWord times page size to account for VM stack during 3641 // class initialization depending on 32 or 64 bit VM. 3642 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, 3643 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3644 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); 3645 3646 size_t threadStackSizeInBytes = ThreadStackSize * K; 3647 if (threadStackSizeInBytes != 0 && 3648 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { 3649 tty->print_cr("\nThe stack size specified is too small, " 3650 "Specify at least %dk", 3651 os::Bsd::min_stack_allowed/ K); 3652 return JNI_ERR; 3653 } 3654 3655 // Make the stack size a multiple of the page size so that 3656 // the yellow/red zones can be guarded. 3657 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 3658 vm_page_size())); 3659 3660 if (MaxFDLimit) { 3661 // set the number of file descriptors to max. print out error 3662 // if getrlimit/setrlimit fails but continue regardless. 3663 struct rlimit nbr_files; 3664 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3665 if (status != 0) { 3666 if (PrintMiscellaneous && (Verbose || WizardMode)) 3667 perror("os::init_2 getrlimit failed"); 3668 } else { 3669 nbr_files.rlim_cur = nbr_files.rlim_max; 3670 3671#ifdef __APPLE__ 3672 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if 3673 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must 3674 // be used instead 3675 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); 3676#endif 3677 3678 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3679 if (status != 0) { 3680 if (PrintMiscellaneous && (Verbose || WizardMode)) 3681 perror("os::init_2 setrlimit failed"); 3682 } 3683 } 3684 } 3685 3686 // at-exit methods are called in the reverse order of their registration. 3687 // atexit functions are called on return from main or as a result of a 3688 // call to exit(3C). There can be only 32 of these functions registered 3689 // and atexit() does not set errno. 3690 3691 if (PerfAllowAtExitRegistration) { 3692 // only register atexit functions if PerfAllowAtExitRegistration is set. 3693 // atexit functions can be delayed until process exit time, which 3694 // can be problematic for embedded VM situations. Embedded VMs should 3695 // call DestroyJavaVM() to assure that VM resources are released. 3696 3697 // note: perfMemory_exit_helper atexit function may be removed in 3698 // the future if the appropriate cleanup code can be added to the 3699 // VM_Exit VMOperation's doit method. 3700 if (atexit(perfMemory_exit_helper) != 0) { 3701 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3702 } 3703 } 3704 3705 // initialize thread priority policy 3706 prio_init(); 3707 3708#ifdef __APPLE__ 3709 // dynamically link to objective c gc registration 3710 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); 3711 if (handleLibObjc != NULL) { 3712 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); 3713 } 3714#endif 3715 3716 return JNI_OK; 3717} 3718 3719// this is called at the end of vm_initialization 3720void os::init_3(void) { } 3721 3722// Mark the polling page as unreadable 3723void os::make_polling_page_unreadable(void) { 3724 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) 3725 fatal("Could not disable polling page"); 3726}; 3727 3728// Mark the polling page as readable 3729void os::make_polling_page_readable(void) { 3730 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { 3731 fatal("Could not enable polling page"); 3732 } 3733}; 3734 3735int os::active_processor_count() { 3736 return _processor_count; 3737} 3738 3739void os::set_native_thread_name(const char *name) { 3740#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 3741 // This is only supported in Snow Leopard and beyond 3742 if (name != NULL) { 3743 // Add a "Java: " prefix to the name 3744 char buf[MAXTHREADNAMESIZE]; 3745 snprintf(buf, sizeof(buf), "Java: %s", name); 3746 pthread_setname_np(buf); 3747 } 3748#endif 3749} 3750 3751bool os::distribute_processes(uint length, uint* distribution) { 3752 // Not yet implemented. 3753 return false; 3754} 3755 3756bool os::bind_to_processor(uint processor_id) { 3757 // Not yet implemented. 3758 return false; 3759} 3760 3761void os::SuspendedThreadTask::internal_do_task() { 3762 if (do_suspend(_thread->osthread())) { 3763 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3764 do_task(context); 3765 do_resume(_thread->osthread()); 3766 } 3767} 3768 3769/// 3770class PcFetcher : public os::SuspendedThreadTask { 3771public: 3772 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3773 ExtendedPC result(); 3774protected: 3775 void do_task(const os::SuspendedThreadTaskContext& context); 3776private: 3777 ExtendedPC _epc; 3778}; 3779 3780ExtendedPC PcFetcher::result() { 3781 guarantee(is_done(), "task is not done yet."); 3782 return _epc; 3783} 3784 3785void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3786 Thread* thread = context.thread(); 3787 OSThread* osthread = thread->osthread(); 3788 if (osthread->ucontext() != NULL) { 3789 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); 3790 } else { 3791 // NULL context is unexpected, double-check this is the VMThread 3792 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3793 } 3794} 3795 3796// Suspends the target using the signal mechanism and then grabs the PC before 3797// resuming the target. Used by the flat-profiler only 3798ExtendedPC os::get_thread_pc(Thread* thread) { 3799 // Make sure that it is called by the watcher for the VMThread 3800 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); 3801 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3802 3803 PcFetcher fetcher(thread); 3804 fetcher.run(); 3805 return fetcher.result(); 3806} 3807 3808int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) 3809{ 3810 return pthread_cond_timedwait(_cond, _mutex, _abstime); 3811} 3812 3813//////////////////////////////////////////////////////////////////////////////// 3814// debug support 3815 3816bool os::find(address addr, outputStream* st) { 3817 Dl_info dlinfo; 3818 memset(&dlinfo, 0, sizeof(dlinfo)); 3819 if (dladdr(addr, &dlinfo) != 0) { 3820 st->print(PTR_FORMAT ": ", addr); 3821 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 3822 st->print("%s+%#x", dlinfo.dli_sname, 3823 addr - (intptr_t)dlinfo.dli_saddr); 3824 } else if (dlinfo.dli_fbase != NULL) { 3825 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); 3826 } else { 3827 st->print("<absolute address>"); 3828 } 3829 if (dlinfo.dli_fname != NULL) { 3830 st->print(" in %s", dlinfo.dli_fname); 3831 } 3832 if (dlinfo.dli_fbase != NULL) { 3833 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 3834 } 3835 st->cr(); 3836 3837 if (Verbose) { 3838 // decode some bytes around the PC 3839 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 3840 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 3841 address lowest = (address) dlinfo.dli_sname; 3842 if (!lowest) lowest = (address) dlinfo.dli_fbase; 3843 if (begin < lowest) begin = lowest; 3844 Dl_info dlinfo2; 3845 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 3846 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 3847 end = (address) dlinfo2.dli_saddr; 3848 Disassembler::decode(begin, end, st); 3849 } 3850 return true; 3851 } 3852 return false; 3853} 3854 3855//////////////////////////////////////////////////////////////////////////////// 3856// misc 3857 3858// This does not do anything on Bsd. This is basically a hook for being 3859// able to use structured exception handling (thread-local exception filters) 3860// on, e.g., Win32. 3861void 3862os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, 3863 JavaCallArguments* args, Thread* thread) { 3864 f(value, method, args, thread); 3865} 3866 3867void os::print_statistics() { 3868} 3869 3870int os::message_box(const char* title, const char* message) { 3871 int i; 3872 fdStream err(defaultStream::error_fd()); 3873 for (i = 0; i < 78; i++) err.print_raw("="); 3874 err.cr(); 3875 err.print_raw_cr(title); 3876 for (i = 0; i < 78; i++) err.print_raw("-"); 3877 err.cr(); 3878 err.print_raw_cr(message); 3879 for (i = 0; i < 78; i++) err.print_raw("="); 3880 err.cr(); 3881 3882 char buf[16]; 3883 // Prevent process from exiting upon "read error" without consuming all CPU 3884 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3885 3886 return buf[0] == 'y' || buf[0] == 'Y'; 3887} 3888 3889int os::stat(const char *path, struct stat *sbuf) { 3890 char pathbuf[MAX_PATH]; 3891 if (strlen(path) > MAX_PATH - 1) { 3892 errno = ENAMETOOLONG; 3893 return -1; 3894 } 3895 os::native_path(strcpy(pathbuf, path)); 3896 return ::stat(pathbuf, sbuf); 3897} 3898 3899bool os::check_heap(bool force) { 3900 return true; 3901} 3902 3903int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { 3904 return ::vsnprintf(buf, count, format, args); 3905} 3906 3907// Is a (classpath) directory empty? 3908bool os::dir_is_empty(const char* path) { 3909 DIR *dir = NULL; 3910 struct dirent *ptr; 3911 3912 dir = opendir(path); 3913 if (dir == NULL) return true; 3914 3915 /* Scan the directory */ 3916 bool result = true; 3917 char buf[sizeof(struct dirent) + MAX_PATH]; 3918 while (result && (ptr = ::readdir(dir)) != NULL) { 3919 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3920 result = false; 3921 } 3922 } 3923 closedir(dir); 3924 return result; 3925} 3926 3927// This code originates from JDK's sysOpen and open64_w 3928// from src/solaris/hpi/src/system_md.c 3929 3930#ifndef O_DELETE 3931#define O_DELETE 0x10000 3932#endif 3933 3934// Open a file. Unlink the file immediately after open returns 3935// if the specified oflag has the O_DELETE flag set. 3936// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 3937 3938int os::open(const char *path, int oflag, int mode) { 3939 3940 if (strlen(path) > MAX_PATH - 1) { 3941 errno = ENAMETOOLONG; 3942 return -1; 3943 } 3944 int fd; 3945 int o_delete = (oflag & O_DELETE); 3946 oflag = oflag & ~O_DELETE; 3947 3948 fd = ::open(path, oflag, mode); 3949 if (fd == -1) return -1; 3950 3951 //If the open succeeded, the file might still be a directory 3952 { 3953 struct stat buf; 3954 int ret = ::fstat(fd, &buf); 3955 int st_mode = buf.st_mode; 3956 3957 if (ret != -1) { 3958 if ((st_mode & S_IFMT) == S_IFDIR) { 3959 errno = EISDIR; 3960 ::close(fd); 3961 return -1; 3962 } 3963 } else { 3964 ::close(fd); 3965 return -1; 3966 } 3967 } 3968 3969 /* 3970 * All file descriptors that are opened in the JVM and not 3971 * specifically destined for a subprocess should have the 3972 * close-on-exec flag set. If we don't set it, then careless 3rd 3973 * party native code might fork and exec without closing all 3974 * appropriate file descriptors (e.g. as we do in closeDescriptors in 3975 * UNIXProcess.c), and this in turn might: 3976 * 3977 * - cause end-of-file to fail to be detected on some file 3978 * descriptors, resulting in mysterious hangs, or 3979 * 3980 * - might cause an fopen in the subprocess to fail on a system 3981 * suffering from bug 1085341. 3982 * 3983 * (Yes, the default setting of the close-on-exec flag is a Unix 3984 * design flaw) 3985 * 3986 * See: 3987 * 1085341: 32-bit stdio routines should support file descriptors >255 3988 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3989 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3990 */ 3991#ifdef FD_CLOEXEC 3992 { 3993 int flags = ::fcntl(fd, F_GETFD); 3994 if (flags != -1) 3995 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3996 } 3997#endif 3998 3999 if (o_delete != 0) { 4000 ::unlink(path); 4001 } 4002 return fd; 4003} 4004 4005 4006// create binary file, rewriting existing file if required 4007int os::create_binary_file(const char* path, bool rewrite_existing) { 4008 int oflags = O_WRONLY | O_CREAT; 4009 if (!rewrite_existing) { 4010 oflags |= O_EXCL; 4011 } 4012 return ::open(path, oflags, S_IREAD | S_IWRITE); 4013} 4014 4015// return current position of file pointer 4016jlong os::current_file_offset(int fd) { 4017 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); 4018} 4019 4020// move file pointer to the specified offset 4021jlong os::seek_to_file_offset(int fd, jlong offset) { 4022 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); 4023} 4024 4025// This code originates from JDK's sysAvailable 4026// from src/solaris/hpi/src/native_threads/src/sys_api_td.c 4027 4028int os::available(int fd, jlong *bytes) { 4029 jlong cur, end; 4030 int mode; 4031 struct stat buf; 4032 4033 if (::fstat(fd, &buf) >= 0) { 4034 mode = buf.st_mode; 4035 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4036 /* 4037 * XXX: is the following call interruptible? If so, this might 4038 * need to go through the INTERRUPT_IO() wrapper as for other 4039 * blocking, interruptible calls in this file. 4040 */ 4041 int n; 4042 if (::ioctl(fd, FIONREAD, &n) >= 0) { 4043 *bytes = n; 4044 return 1; 4045 } 4046 } 4047 } 4048 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { 4049 return 0; 4050 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { 4051 return 0; 4052 } else if (::lseek(fd, cur, SEEK_SET) == -1) { 4053 return 0; 4054 } 4055 *bytes = end - cur; 4056 return 1; 4057} 4058 4059int os::socket_available(int fd, jint *pbytes) { 4060 if (fd < 0) 4061 return OS_OK; 4062 4063 int ret; 4064 4065 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 4066 4067 //%% note ioctl can return 0 when successful, JVM_SocketAvailable 4068 // is expected to return 0 on failure and 1 on success to the jdk. 4069 4070 return (ret == OS_ERR) ? 0 : 1; 4071} 4072 4073// Map a block of memory. 4074char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4075 char *addr, size_t bytes, bool read_only, 4076 bool allow_exec) { 4077 int prot; 4078 int flags; 4079 4080 if (read_only) { 4081 prot = PROT_READ; 4082 flags = MAP_SHARED; 4083 } else { 4084 prot = PROT_READ | PROT_WRITE; 4085 flags = MAP_PRIVATE; 4086 } 4087 4088 if (allow_exec) { 4089 prot |= PROT_EXEC; 4090 } 4091 4092 if (addr != NULL) { 4093 flags |= MAP_FIXED; 4094 } 4095 4096 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4097 fd, file_offset); 4098 if (mapped_address == MAP_FAILED) { 4099 return NULL; 4100 } 4101 return mapped_address; 4102} 4103 4104 4105// Remap a block of memory. 4106char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4107 char *addr, size_t bytes, bool read_only, 4108 bool allow_exec) { 4109 // same as map_memory() on this OS 4110 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4111 allow_exec); 4112} 4113 4114 4115// Unmap a block of memory. 4116bool os::pd_unmap_memory(char* addr, size_t bytes) { 4117 return munmap(addr, bytes) == 0; 4118} 4119 4120// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4121// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4122// of a thread. 4123// 4124// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4125// the fast estimate available on the platform. 4126 4127jlong os::current_thread_cpu_time() { 4128#ifdef __APPLE__ 4129 return os::thread_cpu_time(Thread::current(), true /* user + sys */); 4130#else 4131 Unimplemented(); 4132 return 0; 4133#endif 4134} 4135 4136jlong os::thread_cpu_time(Thread* thread) { 4137#ifdef __APPLE__ 4138 return os::thread_cpu_time(thread, true /* user + sys */); 4139#else 4140 Unimplemented(); 4141 return 0; 4142#endif 4143} 4144 4145jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4146#ifdef __APPLE__ 4147 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4148#else 4149 Unimplemented(); 4150 return 0; 4151#endif 4152} 4153 4154jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4155#ifdef __APPLE__ 4156 struct thread_basic_info tinfo; 4157 mach_msg_type_number_t tcount = THREAD_INFO_MAX; 4158 kern_return_t kr; 4159 thread_t mach_thread; 4160 4161 mach_thread = thread->osthread()->thread_id(); 4162 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); 4163 if (kr != KERN_SUCCESS) 4164 return -1; 4165 4166 if (user_sys_cpu_time) { 4167 jlong nanos; 4168 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; 4169 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; 4170 return nanos; 4171 } else { 4172 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); 4173 } 4174#else 4175 Unimplemented(); 4176 return 0; 4177#endif 4178} 4179 4180 4181void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4182 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4183 info_ptr->may_skip_backward = false; // elapsed time not wall time 4184 info_ptr->may_skip_forward = false; // elapsed time not wall time 4185 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4186} 4187 4188void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4189 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4190 info_ptr->may_skip_backward = false; // elapsed time not wall time 4191 info_ptr->may_skip_forward = false; // elapsed time not wall time 4192 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4193} 4194 4195bool os::is_thread_cpu_time_supported() { 4196#ifdef __APPLE__ 4197 return true; 4198#else 4199 return false; 4200#endif 4201} 4202 4203// System loadavg support. Returns -1 if load average cannot be obtained. 4204// Bsd doesn't yet have a (official) notion of processor sets, 4205// so just return the system wide load average. 4206int os::loadavg(double loadavg[], int nelem) { 4207 return ::getloadavg(loadavg, nelem); 4208} 4209 4210void os::pause() { 4211 char filename[MAX_PATH]; 4212 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4213 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4214 } else { 4215 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4216 } 4217 4218 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4219 if (fd != -1) { 4220 struct stat buf; 4221 ::close(fd); 4222 while (::stat(filename, &buf) == 0) { 4223 (void)::poll(NULL, 0, 100); 4224 } 4225 } else { 4226 jio_fprintf(stderr, 4227 "Could not open pause file '%s', continuing immediately.\n", filename); 4228 } 4229} 4230 4231 4232// Refer to the comments in os_solaris.cpp park-unpark. 4233// 4234// Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can 4235// hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. 4236// For specifics regarding the bug see GLIBC BUGID 261237 : 4237// http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. 4238// Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future 4239// will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar 4240// is used. (The simple C test-case provided in the GLIBC bug report manifests the 4241// hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() 4242// and monitorenter when we're using 1-0 locking. All those operations may result in 4243// calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version 4244// of libpthread avoids the problem, but isn't practical. 4245// 4246// Possible remedies: 4247// 4248// 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. 4249// This is palliative and probabilistic, however. If the thread is preempted 4250// between the call to compute_abstime() and pthread_cond_timedwait(), more 4251// than the minimum period may have passed, and the abstime may be stale (in the 4252// past) resultin in a hang. Using this technique reduces the odds of a hang 4253// but the JVM is still vulnerable, particularly on heavily loaded systems. 4254// 4255// 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead 4256// of the usual flag-condvar-mutex idiom. The write side of the pipe is set 4257// NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) 4258// reduces to poll()+read(). This works well, but consumes 2 FDs per extant 4259// thread. 4260// 4261// 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread 4262// that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing 4263// a timeout request to the chron thread and then blocking via pthread_cond_wait(). 4264// This also works well. In fact it avoids kernel-level scalability impediments 4265// on certain platforms that don't handle lots of active pthread_cond_timedwait() 4266// timers in a graceful fashion. 4267// 4268// 4. When the abstime value is in the past it appears that control returns 4269// correctly from pthread_cond_timedwait(), but the condvar is left corrupt. 4270// Subsequent timedwait/wait calls may hang indefinitely. Given that, we 4271// can avoid the problem by reinitializing the condvar -- by cond_destroy() 4272// followed by cond_init() -- after all calls to pthread_cond_timedwait(). 4273// It may be possible to avoid reinitialization by checking the return 4274// value from pthread_cond_timedwait(). In addition to reinitializing the 4275// condvar we must establish the invariant that cond_signal() is only called 4276// within critical sections protected by the adjunct mutex. This prevents 4277// cond_signal() from "seeing" a condvar that's in the midst of being 4278// reinitialized or that is corrupt. Sadly, this invariant obviates the 4279// desirable signal-after-unlock optimization that avoids futile context switching. 4280// 4281// I'm also concerned that some versions of NTPL might allocate an auxilliary 4282// structure when a condvar is used or initialized. cond_destroy() would 4283// release the helper structure. Our reinitialize-after-timedwait fix 4284// put excessive stress on malloc/free and locks protecting the c-heap. 4285// 4286// We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. 4287// It may be possible to refine (4) by checking the kernel and NTPL verisons 4288// and only enabling the work-around for vulnerable environments. 4289 4290// utility to compute the abstime argument to timedwait: 4291// millis is the relative timeout time 4292// abstime will be the absolute timeout time 4293// TODO: replace compute_abstime() with unpackTime() 4294 4295static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { 4296 if (millis < 0) millis = 0; 4297 struct timeval now; 4298 int status = gettimeofday(&now, NULL); 4299 assert(status == 0, "gettimeofday"); 4300 jlong seconds = millis / 1000; 4301 millis %= 1000; 4302 if (seconds > 50000000) { // see man cond_timedwait(3T) 4303 seconds = 50000000; 4304 } 4305 abstime->tv_sec = now.tv_sec + seconds; 4306 long usec = now.tv_usec + millis * 1000; 4307 if (usec >= 1000000) { 4308 abstime->tv_sec += 1; 4309 usec -= 1000000; 4310 } 4311 abstime->tv_nsec = usec * 1000; 4312 return abstime; 4313} 4314 4315 4316// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 4317// Conceptually TryPark() should be equivalent to park(0). 4318 4319int os::PlatformEvent::TryPark() { 4320 for (;;) { 4321 const int v = _Event ; 4322 guarantee ((v == 0) || (v == 1), "invariant") ; 4323 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 4324 } 4325} 4326 4327void os::PlatformEvent::park() { // AKA "down()" 4328 // Invariant: Only the thread associated with the Event/PlatformEvent 4329 // may call park(). 4330 // TODO: assert that _Assoc != NULL or _Assoc == Self 4331 int v ; 4332 for (;;) { 4333 v = _Event ; 4334 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4335 } 4336 guarantee (v >= 0, "invariant") ; 4337 if (v == 0) { 4338 // Do this the hard way by blocking ... 4339 int status = pthread_mutex_lock(_mutex); 4340 assert_status(status == 0, status, "mutex_lock"); 4341 guarantee (_nParked == 0, "invariant") ; 4342 ++ _nParked ; 4343 while (_Event < 0) { 4344 status = pthread_cond_wait(_cond, _mutex); 4345 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4346 // Treat this the same as if the wait was interrupted 4347 if (status == ETIMEDOUT) { status = EINTR; } 4348 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4349 } 4350 -- _nParked ; 4351 4352 _Event = 0 ; 4353 status = pthread_mutex_unlock(_mutex); 4354 assert_status(status == 0, status, "mutex_unlock"); 4355 // Paranoia to ensure our locked and lock-free paths interact 4356 // correctly with each other. 4357 OrderAccess::fence(); 4358 } 4359 guarantee (_Event >= 0, "invariant") ; 4360} 4361 4362int os::PlatformEvent::park(jlong millis) { 4363 guarantee (_nParked == 0, "invariant") ; 4364 4365 int v ; 4366 for (;;) { 4367 v = _Event ; 4368 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4369 } 4370 guarantee (v >= 0, "invariant") ; 4371 if (v != 0) return OS_OK ; 4372 4373 // We do this the hard way, by blocking the thread. 4374 // Consider enforcing a minimum timeout value. 4375 struct timespec abst; 4376 compute_abstime(&abst, millis); 4377 4378 int ret = OS_TIMEOUT; 4379 int status = pthread_mutex_lock(_mutex); 4380 assert_status(status == 0, status, "mutex_lock"); 4381 guarantee (_nParked == 0, "invariant") ; 4382 ++_nParked ; 4383 4384 // Object.wait(timo) will return because of 4385 // (a) notification 4386 // (b) timeout 4387 // (c) thread.interrupt 4388 // 4389 // Thread.interrupt and object.notify{All} both call Event::set. 4390 // That is, we treat thread.interrupt as a special case of notification. 4391 // The underlying Solaris implementation, cond_timedwait, admits 4392 // spurious/premature wakeups, but the JLS/JVM spec prevents the 4393 // JVM from making those visible to Java code. As such, we must 4394 // filter out spurious wakeups. We assume all ETIME returns are valid. 4395 // 4396 // TODO: properly differentiate simultaneous notify+interrupt. 4397 // In that case, we should propagate the notify to another waiter. 4398 4399 while (_Event < 0) { 4400 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); 4401 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4402 pthread_cond_destroy (_cond); 4403 pthread_cond_init (_cond, NULL) ; 4404 } 4405 assert_status(status == 0 || status == EINTR || 4406 status == ETIMEDOUT, 4407 status, "cond_timedwait"); 4408 if (!FilterSpuriousWakeups) break ; // previous semantics 4409 if (status == ETIMEDOUT) break ; 4410 // We consume and ignore EINTR and spurious wakeups. 4411 } 4412 --_nParked ; 4413 if (_Event >= 0) { 4414 ret = OS_OK; 4415 } 4416 _Event = 0 ; 4417 status = pthread_mutex_unlock(_mutex); 4418 assert_status(status == 0, status, "mutex_unlock"); 4419 assert (_nParked == 0, "invariant") ; 4420 // Paranoia to ensure our locked and lock-free paths interact 4421 // correctly with each other. 4422 OrderAccess::fence(); 4423 return ret; 4424} 4425 4426void os::PlatformEvent::unpark() { 4427 // Transitions for _Event: 4428 // 0 :=> 1 4429 // 1 :=> 1 4430 // -1 :=> either 0 or 1; must signal target thread 4431 // That is, we can safely transition _Event from -1 to either 4432 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4433 // unpark() calls. 4434 // See also: "Semaphores in Plan 9" by Mullender & Cox 4435 // 4436 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4437 // that it will take two back-to-back park() calls for the owning 4438 // thread to block. This has the benefit of forcing a spurious return 4439 // from the first park() call after an unpark() call which will help 4440 // shake out uses of park() and unpark() without condition variables. 4441 4442 if (Atomic::xchg(1, &_Event) >= 0) return; 4443 4444 // Wait for the thread associated with the event to vacate 4445 int status = pthread_mutex_lock(_mutex); 4446 assert_status(status == 0, status, "mutex_lock"); 4447 int AnyWaiters = _nParked; 4448 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4449 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { 4450 AnyWaiters = 0; 4451 pthread_cond_signal(_cond); 4452 } 4453 status = pthread_mutex_unlock(_mutex); 4454 assert_status(status == 0, status, "mutex_unlock"); 4455 if (AnyWaiters != 0) { 4456 status = pthread_cond_signal(_cond); 4457 assert_status(status == 0, status, "cond_signal"); 4458 } 4459 4460 // Note that we signal() _after dropping the lock for "immortal" Events. 4461 // This is safe and avoids a common class of futile wakeups. In rare 4462 // circumstances this can cause a thread to return prematurely from 4463 // cond_{timed}wait() but the spurious wakeup is benign and the victim will 4464 // simply re-test the condition and re-park itself. 4465} 4466 4467 4468// JSR166 4469// ------------------------------------------------------- 4470 4471/* 4472 * The solaris and bsd implementations of park/unpark are fairly 4473 * conservative for now, but can be improved. They currently use a 4474 * mutex/condvar pair, plus a a count. 4475 * Park decrements count if > 0, else does a condvar wait. Unpark 4476 * sets count to 1 and signals condvar. Only one thread ever waits 4477 * on the condvar. Contention seen when trying to park implies that someone 4478 * is unparking you, so don't wait. And spurious returns are fine, so there 4479 * is no need to track notifications. 4480 */ 4481 4482#define MAX_SECS 100000000 4483/* 4484 * This code is common to bsd and solaris and will be moved to a 4485 * common place in dolphin. 4486 * 4487 * The passed in time value is either a relative time in nanoseconds 4488 * or an absolute time in milliseconds. Either way it has to be unpacked 4489 * into suitable seconds and nanoseconds components and stored in the 4490 * given timespec structure. 4491 * Given time is a 64-bit value and the time_t used in the timespec is only 4492 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for 4493 * overflow if times way in the future are given. Further on Solaris versions 4494 * prior to 10 there is a restriction (see cond_timedwait) that the specified 4495 * number of seconds, in abstime, is less than current_time + 100,000,000. 4496 * As it will be 28 years before "now + 100000000" will overflow we can 4497 * ignore overflow and just impose a hard-limit on seconds using the value 4498 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 4499 * years from "now". 4500 */ 4501 4502static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { 4503 assert (time > 0, "convertTime"); 4504 4505 struct timeval now; 4506 int status = gettimeofday(&now, NULL); 4507 assert(status == 0, "gettimeofday"); 4508 4509 time_t max_secs = now.tv_sec + MAX_SECS; 4510 4511 if (isAbsolute) { 4512 jlong secs = time / 1000; 4513 if (secs > max_secs) { 4514 absTime->tv_sec = max_secs; 4515 } 4516 else { 4517 absTime->tv_sec = secs; 4518 } 4519 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4520 } 4521 else { 4522 jlong secs = time / NANOSECS_PER_SEC; 4523 if (secs >= MAX_SECS) { 4524 absTime->tv_sec = max_secs; 4525 absTime->tv_nsec = 0; 4526 } 4527 else { 4528 absTime->tv_sec = now.tv_sec + secs; 4529 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4530 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4531 absTime->tv_nsec -= NANOSECS_PER_SEC; 4532 ++absTime->tv_sec; // note: this must be <= max_secs 4533 } 4534 } 4535 } 4536 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4537 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4538 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4539 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4540} 4541 4542void Parker::park(bool isAbsolute, jlong time) { 4543 // Ideally we'd do something useful while spinning, such 4544 // as calling unpackTime(). 4545 4546 // Optional fast-path check: 4547 // Return immediately if a permit is available. 4548 // We depend on Atomic::xchg() having full barrier semantics 4549 // since we are doing a lock-free update to _counter. 4550 if (Atomic::xchg(0, &_counter) > 0) return; 4551 4552 Thread* thread = Thread::current(); 4553 assert(thread->is_Java_thread(), "Must be JavaThread"); 4554 JavaThread *jt = (JavaThread *)thread; 4555 4556 // Optional optimization -- avoid state transitions if there's an interrupt pending. 4557 // Check interrupt before trying to wait 4558 if (Thread::is_interrupted(thread, false)) { 4559 return; 4560 } 4561 4562 // Next, demultiplex/decode time arguments 4563 struct timespec absTime; 4564 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 4565 return; 4566 } 4567 if (time > 0) { 4568 unpackTime(&absTime, isAbsolute, time); 4569 } 4570 4571 4572 // Enter safepoint region 4573 // Beware of deadlocks such as 6317397. 4574 // The per-thread Parker:: mutex is a classic leaf-lock. 4575 // In particular a thread must never block on the Threads_lock while 4576 // holding the Parker:: mutex. If safepoints are pending both the 4577 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4578 ThreadBlockInVM tbivm(jt); 4579 4580 // Don't wait if cannot get lock since interference arises from 4581 // unblocking. Also. check interrupt before trying wait 4582 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { 4583 return; 4584 } 4585 4586 int status ; 4587 if (_counter > 0) { // no wait needed 4588 _counter = 0; 4589 status = pthread_mutex_unlock(_mutex); 4590 assert (status == 0, "invariant") ; 4591 // Paranoia to ensure our locked and lock-free paths interact 4592 // correctly with each other and Java-level accesses. 4593 OrderAccess::fence(); 4594 return; 4595 } 4596 4597#ifdef ASSERT 4598 // Don't catch signals while blocked; let the running threads have the signals. 4599 // (This allows a debugger to break into the running thread.) 4600 sigset_t oldsigs; 4601 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); 4602 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 4603#endif 4604 4605 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4606 jt->set_suspend_equivalent(); 4607 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4608 4609 if (time == 0) { 4610 status = pthread_cond_wait (_cond, _mutex) ; 4611 } else { 4612 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; 4613 if (status != 0 && WorkAroundNPTLTimedWaitHang) { 4614 pthread_cond_destroy (_cond) ; 4615 pthread_cond_init (_cond, NULL); 4616 } 4617 } 4618 assert_status(status == 0 || status == EINTR || 4619 status == ETIMEDOUT, 4620 status, "cond_timedwait"); 4621 4622#ifdef ASSERT 4623 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 4624#endif 4625 4626 _counter = 0 ; 4627 status = pthread_mutex_unlock(_mutex) ; 4628 assert_status(status == 0, status, "invariant") ; 4629 // Paranoia to ensure our locked and lock-free paths interact 4630 // correctly with each other and Java-level accesses. 4631 OrderAccess::fence(); 4632 4633 // If externally suspended while waiting, re-suspend 4634 if (jt->handle_special_suspend_equivalent_condition()) { 4635 jt->java_suspend_self(); 4636 } 4637} 4638 4639void Parker::unpark() { 4640 int s, status ; 4641 status = pthread_mutex_lock(_mutex); 4642 assert (status == 0, "invariant") ; 4643 s = _counter; 4644 _counter = 1; 4645 if (s < 1) { 4646 if (WorkAroundNPTLTimedWaitHang) { 4647 status = pthread_cond_signal (_cond) ; 4648 assert (status == 0, "invariant") ; 4649 status = pthread_mutex_unlock(_mutex); 4650 assert (status == 0, "invariant") ; 4651 } else { 4652 status = pthread_mutex_unlock(_mutex); 4653 assert (status == 0, "invariant") ; 4654 status = pthread_cond_signal (_cond) ; 4655 assert (status == 0, "invariant") ; 4656 } 4657 } else { 4658 pthread_mutex_unlock(_mutex); 4659 assert (status == 0, "invariant") ; 4660 } 4661} 4662 4663 4664/* Darwin has no "environ" in a dynamic library. */ 4665#ifdef __APPLE__ 4666#include <crt_externs.h> 4667#define environ (*_NSGetEnviron()) 4668#else 4669extern char** environ; 4670#endif 4671 4672// Run the specified command in a separate process. Return its exit value, 4673// or -1 on failure (e.g. can't fork a new process). 4674// Unlike system(), this function can be called from signal handler. It 4675// doesn't block SIGINT et al. 4676int os::fork_and_exec(char* cmd) { 4677 const char * argv[4] = {"sh", "-c", cmd, NULL}; 4678 4679 // fork() in BsdThreads/NPTL is not async-safe. It needs to run 4680 // pthread_atfork handlers and reset pthread library. All we need is a 4681 // separate process to execve. Make a direct syscall to fork process. 4682 // On IA64 there's no fork syscall, we have to use fork() and hope for 4683 // the best... 4684 pid_t pid = fork(); 4685 4686 if (pid < 0) { 4687 // fork failed 4688 return -1; 4689 4690 } else if (pid == 0) { 4691 // child process 4692 4693 // execve() in BsdThreads will call pthread_kill_other_threads_np() 4694 // first to kill every thread on the thread list. Because this list is 4695 // not reset by fork() (see notes above), execve() will instead kill 4696 // every thread in the parent process. We know this is the only thread 4697 // in the new process, so make a system call directly. 4698 // IA64 should use normal execve() from glibc to match the glibc fork() 4699 // above. 4700 execve("/bin/sh", (char* const*)argv, environ); 4701 4702 // execve failed 4703 _exit(-1); 4704 4705 } else { 4706 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4707 // care about the actual exit code, for now. 4708 4709 int status; 4710 4711 // Wait for the child process to exit. This returns immediately if 4712 // the child has already exited. */ 4713 while (waitpid(pid, &status, 0) < 0) { 4714 switch (errno) { 4715 case ECHILD: return 0; 4716 case EINTR: break; 4717 default: return -1; 4718 } 4719 } 4720 4721 if (WIFEXITED(status)) { 4722 // The child exited normally; get its exit code. 4723 return WEXITSTATUS(status); 4724 } else if (WIFSIGNALED(status)) { 4725 // The child exited because of a signal 4726 // The best value to return is 0x80 + signal number, 4727 // because that is what all Unix shells do, and because 4728 // it allows callers to distinguish between process exit and 4729 // process death by signal. 4730 return 0x80 + WTERMSIG(status); 4731 } else { 4732 // Unknown exit code; pass it through 4733 return status; 4734 } 4735 } 4736} 4737 4738// is_headless_jre() 4739// 4740// Test for the existence of xawt/libmawt.so or libawt_xawt.so 4741// in order to report if we are running in a headless jre 4742// 4743// Since JDK8 xawt/libmawt.so was moved into the same directory 4744// as libawt.so, and renamed libawt_xawt.so 4745// 4746bool os::is_headless_jre() { 4747#ifdef __APPLE__ 4748 // We no longer build headless-only on Mac OS X 4749 return false; 4750#else 4751 struct stat statbuf; 4752 char buf[MAXPATHLEN]; 4753 char libmawtpath[MAXPATHLEN]; 4754 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; 4755 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; 4756 char *p; 4757 4758 // Get path to libjvm.so 4759 os::jvm_path(buf, sizeof(buf)); 4760 4761 // Get rid of libjvm.so 4762 p = strrchr(buf, '/'); 4763 if (p == NULL) return false; 4764 else *p = '\0'; 4765 4766 // Get rid of client or server 4767 p = strrchr(buf, '/'); 4768 if (p == NULL) return false; 4769 else *p = '\0'; 4770 4771 // check xawt/libmawt.so 4772 strcpy(libmawtpath, buf); 4773 strcat(libmawtpath, xawtstr); 4774 if (::stat(libmawtpath, &statbuf) == 0) return false; 4775 4776 // check libawt_xawt.so 4777 strcpy(libmawtpath, buf); 4778 strcat(libmawtpath, new_xawtstr); 4779 if (::stat(libmawtpath, &statbuf) == 0) return false; 4780 4781 return true; 4782#endif 4783} 4784 4785// Get the default path to the core file 4786// Returns the length of the string 4787int os::get_core_path(char* buffer, size_t bufferSize) { 4788 int n = jio_snprintf(buffer, bufferSize, "/cores"); 4789 4790 // Truncate if theoretical string was longer than bufferSize 4791 n = MIN2(n, (int)bufferSize); 4792 4793 return n; 4794} 4795 4796#ifndef PRODUCT 4797void TestReserveMemorySpecial_test() { 4798 // No tests available for this platform 4799} 4800#endif 4801