| /* |
| * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| // no precompiled headers |
| #include "classfile/classLoader.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "code/icBuffer.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "compiler/disassembler.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "jvm_bsd.h" |
| #include "logging/log.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/filemap.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "os_bsd.inline.hpp" |
| #include "os_share_bsd.hpp" |
| #include "prims/jniFastGetField.hpp" |
| #include "prims/jvm.h" |
| #include "prims/jvm_misc.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/extendedPC.hpp" |
| #include "runtime/globals.hpp" |
| #include "runtime/interfaceSupport.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/objectMonitor.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "runtime/osThread.hpp" |
| #include "runtime/perfMemory.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/statSampler.hpp" |
| #include "runtime/stubRoutines.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "runtime/threadCritical.hpp" |
| #include "runtime/timer.hpp" |
| #include "semaphore_bsd.hpp" |
| #include "services/attachListener.hpp" |
| #include "services/memTracker.hpp" |
| #include "services/runtimeService.hpp" |
| #include "utilities/align.hpp" |
| #include "utilities/decoder.hpp" |
| #include "utilities/defaultStream.hpp" |
| #include "utilities/events.hpp" |
| #include "utilities/growableArray.hpp" |
| #include "utilities/vmError.hpp" |
| |
| // put OS-includes here |
| # include <sys/types.h> |
| # include <sys/mman.h> |
| # include <sys/stat.h> |
| # include <sys/select.h> |
| # include <pthread.h> |
| # include <signal.h> |
| # include <errno.h> |
| # include <dlfcn.h> |
| # include <stdio.h> |
| # include <unistd.h> |
| # include <sys/resource.h> |
| # include <pthread.h> |
| # include <sys/stat.h> |
| # include <sys/time.h> |
| # include <sys/times.h> |
| # include <sys/utsname.h> |
| # include <sys/socket.h> |
| # include <sys/wait.h> |
| # include <time.h> |
| # include <pwd.h> |
| # include <poll.h> |
| # include <semaphore.h> |
| # include <fcntl.h> |
| # include <string.h> |
| # include <sys/param.h> |
| # include <sys/sysctl.h> |
| # include <sys/ipc.h> |
| # include <sys/shm.h> |
| #ifndef __APPLE__ |
| # include <link.h> |
| #endif |
| # include <stdint.h> |
| # include <inttypes.h> |
| # include <sys/ioctl.h> |
| # include <sys/syscall.h> |
| |
| #if defined(__FreeBSD__) || defined(__NetBSD__) |
| #include <elf.h> |
| #endif |
| |
| #ifdef __APPLE__ |
| #include <mach/mach.h> // semaphore_* API |
| #include <mach-o/dyld.h> |
| #include <sys/proc_info.h> |
| #include <objc/objc-auto.h> |
| #endif |
| |
| #ifndef MAP_ANONYMOUS |
| #define MAP_ANONYMOUS MAP_ANON |
| #endif |
| |
| #define MAX_PATH (2 * K) |
| |
| // for timer info max values which include all bits |
| #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) |
| |
| #define LARGEPAGES_BIT (1 << 6) |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // global variables |
| julong os::Bsd::_physical_memory = 0; |
| |
| #ifdef __APPLE__ |
| mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; |
| volatile uint64_t os::Bsd::_max_abstime = 0; |
| #else |
| int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; |
| #endif |
| pthread_t os::Bsd::_main_thread; |
| int os::Bsd::_page_size = -1; |
| |
| static jlong initial_time_count=0; |
| |
| static int clock_tics_per_sec = 100; |
| |
| // For diagnostics to print a message once. see run_periodic_checks |
| static sigset_t check_signal_done; |
| static bool check_signals = true; |
| |
| static pid_t _initial_pid = 0; |
| |
| // Signal number used to suspend/resume a thread |
| |
| // do not use any signal number less than SIGSEGV, see 4355769 |
| static int SR_signum = SIGUSR2; |
| sigset_t SR_sigset; |
| |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // utility functions |
| |
| static int SR_initialize(); |
| |
| julong os::available_memory() { |
| return Bsd::available_memory(); |
| } |
| |
| // available here means free |
| julong os::Bsd::available_memory() { |
| uint64_t available = physical_memory() >> 2; |
| #ifdef __APPLE__ |
| mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; |
| vm_statistics64_data_t vmstat; |
| kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, |
| (host_info64_t)&vmstat, &count); |
| assert(kerr == KERN_SUCCESS, |
| "host_statistics64 failed - check mach_host_self() and count"); |
| if (kerr == KERN_SUCCESS) { |
| available = vmstat.free_count * os::vm_page_size(); |
| } |
| #endif |
| return available; |
| } |
| |
| julong os::physical_memory() { |
| return Bsd::physical_memory(); |
| } |
| |
| // Return true if user is running as root. |
| |
| bool os::have_special_privileges() { |
| static bool init = false; |
| static bool privileges = false; |
| if (!init) { |
| privileges = (getuid() != geteuid()) || (getgid() != getegid()); |
| init = true; |
| } |
| return privileges; |
| } |
| |
| |
| |
| // Cpu architecture string |
| #if defined(ZERO) |
| static char cpu_arch[] = ZERO_LIBARCH; |
| #elif defined(IA64) |
| static char cpu_arch[] = "ia64"; |
| #elif defined(IA32) |
| static char cpu_arch[] = "i386"; |
| #elif defined(AMD64) |
| static char cpu_arch[] = "amd64"; |
| #elif defined(ARM) |
| static char cpu_arch[] = "arm"; |
| #elif defined(PPC32) |
| static char cpu_arch[] = "ppc"; |
| #elif defined(SPARC) |
| #ifdef _LP64 |
| static char cpu_arch[] = "sparcv9"; |
| #else |
| static char cpu_arch[] = "sparc"; |
| #endif |
| #else |
| #error Add appropriate cpu_arch setting |
| #endif |
| |
| // Compiler variant |
| #ifdef COMPILER2 |
| #define COMPILER_VARIANT "server" |
| #else |
| #define COMPILER_VARIANT "client" |
| #endif |
| |
| |
| void os::Bsd::initialize_system_info() { |
| int mib[2]; |
| size_t len; |
| int cpu_val; |
| julong mem_val; |
| |
| // get processors count via hw.ncpus sysctl |
| mib[0] = CTL_HW; |
| mib[1] = HW_NCPU; |
| len = sizeof(cpu_val); |
| if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { |
| assert(len == sizeof(cpu_val), "unexpected data size"); |
| set_processor_count(cpu_val); |
| } else { |
| set_processor_count(1); // fallback |
| } |
| |
| // get physical memory via hw.memsize sysctl (hw.memsize is used |
| // since it returns a 64 bit value) |
| mib[0] = CTL_HW; |
| |
| #if defined (HW_MEMSIZE) // Apple |
| mib[1] = HW_MEMSIZE; |
| #elif defined(HW_PHYSMEM) // Most of BSD |
| mib[1] = HW_PHYSMEM; |
| #elif defined(HW_REALMEM) // Old FreeBSD |
| mib[1] = HW_REALMEM; |
| #else |
| #error No ways to get physmem |
| #endif |
| |
| len = sizeof(mem_val); |
| if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
| assert(len == sizeof(mem_val), "unexpected data size"); |
| _physical_memory = mem_val; |
| } else { |
| _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?) |
| } |
| |
| #ifdef __OpenBSD__ |
| { |
| // limit _physical_memory memory view on OpenBSD since |
| // datasize rlimit restricts us anyway. |
| struct rlimit limits; |
| getrlimit(RLIMIT_DATA, &limits); |
| _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); |
| } |
| #endif |
| } |
| |
| #ifdef __APPLE__ |
| static const char *get_home() { |
| const char *home_dir = ::getenv("HOME"); |
| if ((home_dir == NULL) || (*home_dir == '\0')) { |
| struct passwd *passwd_info = getpwuid(geteuid()); |
| if (passwd_info != NULL) { |
| home_dir = passwd_info->pw_dir; |
| } |
| } |
| |
| return home_dir; |
| } |
| #endif |
| |
| void os::init_system_properties_values() { |
| // The next steps are taken in the product version: |
| // |
| // Obtain the JAVA_HOME value from the location of libjvm.so. |
| // This library should be located at: |
| // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
| // |
| // If "/jre/lib/" appears at the right place in the path, then we |
| // assume libjvm.so is installed in a JDK and we use this path. |
| // |
| // Otherwise exit with message: "Could not create the Java virtual machine." |
| // |
| // The following extra steps are taken in the debugging version: |
| // |
| // If "/jre/lib/" does NOT appear at the right place in the path |
| // instead of exit check for $JAVA_HOME environment variable. |
| // |
| // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, |
| // then we append a fake suffix "hotspot/libjvm.so" to this path so |
| // it looks like libjvm.so is installed there |
| // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
| // |
| // Otherwise exit. |
| // |
| // Important note: if the location of libjvm.so changes this |
| // code needs to be changed accordingly. |
| |
| // See ld(1): |
| // The linker uses the following search paths to locate required |
| // shared libraries: |
| // 1: ... |
| // ... |
| // 7: The default directories, normally /lib and /usr/lib. |
| #ifndef DEFAULT_LIBPATH |
| #define DEFAULT_LIBPATH "/lib:/usr/lib" |
| #endif |
| |
| // Base path of extensions installed on the system. |
| #define SYS_EXT_DIR "/usr/java/packages" |
| #define EXTENSIONS_DIR "/lib/ext" |
| |
| #ifndef __APPLE__ |
| |
| // Buffer that fits several sprintfs. |
| // Note that the space for the colon and the trailing null are provided |
| // by the nulls included by the sizeof operator. |
| const size_t bufsize = |
| MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. |
| (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir |
| char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
| |
| // sysclasspath, java_home, dll_dir |
| { |
| char *pslash; |
| os::jvm_path(buf, bufsize); |
| |
| // Found the full path to libjvm.so. |
| // Now cut the path to <java_home>/jre if we can. |
| *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
| } |
| Arguments::set_dll_dir(buf); |
| |
| if (pslash != NULL) { |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /<arch>. |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /lib. |
| } |
| } |
| } |
| Arguments::set_java_home(buf); |
| set_boot_path('/', ':'); |
| } |
| |
| // Where to look for native libraries. |
| // |
| // Note: Due to a legacy implementation, most of the library path |
| // is set in the launcher. This was to accomodate linking restrictions |
| // on legacy Bsd implementations (which are no longer supported). |
| // Eventually, all the library path setting will be done here. |
| // |
| // However, to prevent the proliferation of improperly built native |
| // libraries, the new path component /usr/java/packages is added here. |
| // Eventually, all the library path setting will be done here. |
| { |
| // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
| // should always exist (until the legacy problem cited above is |
| // addressed). |
| const char *v = ::getenv("LD_LIBRARY_PATH"); |
| const char *v_colon = ":"; |
| if (v == NULL) { v = ""; v_colon = ""; } |
| // That's +1 for the colon and +1 for the trailing '\0'. |
| char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
| strlen(v) + 1 + |
| sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, |
| mtInternal); |
| sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); |
| Arguments::set_library_path(ld_library_path); |
| FREE_C_HEAP_ARRAY(char, ld_library_path); |
| } |
| |
| // Extensions directories. |
| sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); |
| Arguments::set_ext_dirs(buf); |
| |
| FREE_C_HEAP_ARRAY(char, buf); |
| |
| #else // __APPLE__ |
| |
| #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" |
| #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" |
| |
| const char *user_home_dir = get_home(); |
| // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. |
| size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + |
| sizeof(SYS_EXTENSIONS_DIRS); |
| |
| // Buffer that fits several sprintfs. |
| // Note that the space for the colon and the trailing null are provided |
| // by the nulls included by the sizeof operator. |
| const size_t bufsize = |
| MAX2((size_t)MAXPATHLEN, // for dll_dir & friends. |
| (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir |
| char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
| |
| // sysclasspath, java_home, dll_dir |
| { |
| char *pslash; |
| os::jvm_path(buf, bufsize); |
| |
| // Found the full path to libjvm.so. |
| // Now cut the path to <java_home>/jre if we can. |
| *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
| } |
| #ifdef STATIC_BUILD |
| strcat(buf, "/lib"); |
| #endif |
| |
| Arguments::set_dll_dir(buf); |
| |
| if (pslash != NULL) { |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /lib. |
| } |
| } |
| Arguments::set_java_home(buf); |
| set_boot_path('/', ':'); |
| } |
| |
| // Where to look for native libraries. |
| // |
| // Note: Due to a legacy implementation, most of the library path |
| // is set in the launcher. This was to accomodate linking restrictions |
| // on legacy Bsd implementations (which are no longer supported). |
| // Eventually, all the library path setting will be done here. |
| // |
| // However, to prevent the proliferation of improperly built native |
| // libraries, the new path component /usr/java/packages is added here. |
| // Eventually, all the library path setting will be done here. |
| { |
| // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
| // should always exist (until the legacy problem cited above is |
| // addressed). |
| // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code |
| // can specify a directory inside an app wrapper |
| const char *l = ::getenv("JAVA_LIBRARY_PATH"); |
| const char *l_colon = ":"; |
| if (l == NULL) { l = ""; l_colon = ""; } |
| |
| const char *v = ::getenv("DYLD_LIBRARY_PATH"); |
| const char *v_colon = ":"; |
| if (v == NULL) { v = ""; v_colon = ""; } |
| |
| // Apple's Java6 has "." at the beginning of java.library.path. |
| // OpenJDK on Windows has "." at the end of java.library.path. |
| // OpenJDK on Linux and Solaris don't have "." in java.library.path |
| // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
| // "." is appended to the end of java.library.path. Yes, this |
| // could cause a change in behavior, but Apple's Java6 behavior |
| // can be achieved by putting "." at the beginning of the |
| // JAVA_LIBRARY_PATH environment variable. |
| char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
| strlen(v) + 1 + strlen(l) + 1 + |
| system_ext_size + 3, |
| mtInternal); |
| sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", |
| v, v_colon, l, l_colon, user_home_dir); |
| Arguments::set_library_path(ld_library_path); |
| FREE_C_HEAP_ARRAY(char, ld_library_path); |
| } |
| |
| // Extensions directories. |
| // |
| // Note that the space for the colon and the trailing null are provided |
| // by the nulls included by the sizeof operator (so actually one byte more |
| // than necessary is allocated). |
| sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, |
| user_home_dir, Arguments::get_java_home()); |
| Arguments::set_ext_dirs(buf); |
| |
| FREE_C_HEAP_ARRAY(char, buf); |
| |
| #undef SYS_EXTENSIONS_DIR |
| #undef SYS_EXTENSIONS_DIRS |
| |
| #endif // __APPLE__ |
| |
| #undef SYS_EXT_DIR |
| #undef EXTENSIONS_DIR |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // breakpoint support |
| |
| void os::breakpoint() { |
| BREAKPOINT; |
| } |
| |
| extern "C" void breakpoint() { |
| // use debugger to set breakpoint here |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // signal support |
| |
| debug_only(static bool signal_sets_initialized = false); |
| static sigset_t unblocked_sigs, vm_sigs; |
| |
| bool os::Bsd::is_sig_ignored(int sig) { |
| struct sigaction oact; |
| sigaction(sig, (struct sigaction*)NULL, &oact); |
| void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) |
| : CAST_FROM_FN_PTR(void*, oact.sa_handler); |
| if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| void os::Bsd::signal_sets_init() { |
| // Should also have an assertion stating we are still single-threaded. |
| assert(!signal_sets_initialized, "Already initialized"); |
| // Fill in signals that are necessarily unblocked for all threads in |
| // the VM. Currently, we unblock the following signals: |
| // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden |
| // by -Xrs (=ReduceSignalUsage)); |
| // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all |
| // other threads. The "ReduceSignalUsage" boolean tells us not to alter |
| // the dispositions or masks wrt these signals. |
| // Programs embedding the VM that want to use the above signals for their |
| // own purposes must, at this time, use the "-Xrs" option to prevent |
| // interference with shutdown hooks and BREAK_SIGNAL thread dumping. |
| // (See bug 4345157, and other related bugs). |
| // In reality, though, unblocking these signals is really a nop, since |
| // these signals are not blocked by default. |
| sigemptyset(&unblocked_sigs); |
| sigaddset(&unblocked_sigs, SIGILL); |
| sigaddset(&unblocked_sigs, SIGSEGV); |
| sigaddset(&unblocked_sigs, SIGBUS); |
| sigaddset(&unblocked_sigs, SIGFPE); |
| sigaddset(&unblocked_sigs, SR_signum); |
| |
| if (!ReduceSignalUsage) { |
| if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { |
| sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); |
| |
| } |
| if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { |
| sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); |
| } |
| if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { |
| sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); |
| } |
| } |
| // Fill in signals that are blocked by all but the VM thread. |
| sigemptyset(&vm_sigs); |
| if (!ReduceSignalUsage) { |
| sigaddset(&vm_sigs, BREAK_SIGNAL); |
| } |
| debug_only(signal_sets_initialized = true); |
| |
| } |
| |
| // These are signals that are unblocked while a thread is running Java. |
| // (For some reason, they get blocked by default.) |
| sigset_t* os::Bsd::unblocked_signals() { |
| assert(signal_sets_initialized, "Not initialized"); |
| return &unblocked_sigs; |
| } |
| |
| // These are the signals that are blocked while a (non-VM) thread is |
| // running Java. Only the VM thread handles these signals. |
| sigset_t* os::Bsd::vm_signals() { |
| assert(signal_sets_initialized, "Not initialized"); |
| return &vm_sigs; |
| } |
| |
| void os::Bsd::hotspot_sigmask(Thread* thread) { |
| |
| //Save caller's signal mask before setting VM signal mask |
| sigset_t caller_sigmask; |
| pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); |
| |
| OSThread* osthread = thread->osthread(); |
| osthread->set_caller_sigmask(caller_sigmask); |
| |
| pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); |
| |
| if (!ReduceSignalUsage) { |
| if (thread->is_VM_thread()) { |
| // Only the VM thread handles BREAK_SIGNAL ... |
| pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); |
| } else { |
| // ... all other threads block BREAK_SIGNAL |
| pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); |
| } |
| } |
| } |
| |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // create new thread |
| |
| #ifdef __APPLE__ |
| // library handle for calling objc_registerThreadWithCollector() |
| // without static linking to the libobjc library |
| #define OBJC_LIB "/usr/lib/libobjc.dylib" |
| #define OBJC_GCREGISTER "objc_registerThreadWithCollector" |
| typedef void (*objc_registerThreadWithCollector_t)(); |
| extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; |
| objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; |
| #endif |
| |
| #ifdef __APPLE__ |
| static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { |
| // Additional thread_id used to correlate threads in SA |
| thread_identifier_info_data_t m_ident_info; |
| mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
| |
| thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, |
| (thread_info_t) &m_ident_info, &count); |
| |
| return m_ident_info.thread_id; |
| } |
| #endif |
| |
| // Thread start routine for all newly created threads |
| static void *thread_native_entry(Thread *thread) { |
| // Try to randomize the cache line index of hot stack frames. |
| // This helps when threads of the same stack traces evict each other's |
| // cache lines. The threads can be either from the same JVM instance, or |
| // from different JVM instances. The benefit is especially true for |
| // processors with hyperthreading technology. |
| static int counter = 0; |
| int pid = os::current_process_id(); |
| alloca(((pid ^ counter++) & 7) * 128); |
| |
| thread->initialize_thread_current(); |
| |
| OSThread* osthread = thread->osthread(); |
| Monitor* sync = osthread->startThread_lock(); |
| |
| osthread->set_thread_id(os::Bsd::gettid()); |
| |
| log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", |
| os::current_thread_id(), (uintx) pthread_self()); |
| |
| #ifdef __APPLE__ |
| uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
| guarantee(unique_thread_id != 0, "unique thread id was not found"); |
| osthread->set_unique_thread_id(unique_thread_id); |
| #endif |
| // initialize signal mask for this thread |
| os::Bsd::hotspot_sigmask(thread); |
| |
| // initialize floating point control register |
| os::Bsd::init_thread_fpu_state(); |
| |
| #ifdef __APPLE__ |
| // register thread with objc gc |
| if (objc_registerThreadWithCollectorFunction != NULL) { |
| objc_registerThreadWithCollectorFunction(); |
| } |
| #endif |
| |
| // handshaking with parent thread |
| { |
| MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); |
| |
| // notify parent thread |
| osthread->set_state(INITIALIZED); |
| sync->notify_all(); |
| |
| // wait until os::start_thread() |
| while (osthread->get_state() == INITIALIZED) { |
| sync->wait(Mutex::_no_safepoint_check_flag); |
| } |
| } |
| |
| // call one more level start routine |
| thread->run(); |
| |
| log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", |
| os::current_thread_id(), (uintx) pthread_self()); |
| |
| // If a thread has not deleted itself ("delete this") as part of its |
| // termination sequence, we have to ensure thread-local-storage is |
| // cleared before we actually terminate. No threads should ever be |
| // deleted asynchronously with respect to their termination. |
| if (Thread::current_or_null_safe() != NULL) { |
| assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); |
| thread->clear_thread_current(); |
| } |
| |
| return 0; |
| } |
| |
| bool os::create_thread(Thread* thread, ThreadType thr_type, |
| size_t req_stack_size) { |
| assert(thread->osthread() == NULL, "caller responsible"); |
| |
| // Allocate the OSThread object |
| OSThread* osthread = new OSThread(NULL, NULL); |
| if (osthread == NULL) { |
| return false; |
| } |
| |
| // set the correct thread state |
| osthread->set_thread_type(thr_type); |
| |
| // Initial state is ALLOCATED but not INITIALIZED |
| osthread->set_state(ALLOCATED); |
| |
| thread->set_osthread(osthread); |
| |
| // init thread attributes |
| pthread_attr_t attr; |
| pthread_attr_init(&attr); |
| pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| |
| // calculate stack size if it's not specified by caller |
| size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); |
| int status = pthread_attr_setstacksize(&attr, stack_size); |
| assert_status(status == 0, status, "pthread_attr_setstacksize"); |
| |
| ThreadState state; |
| |
| { |
| pthread_t tid; |
| int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); |
| |
| char buf[64]; |
| if (ret == 0) { |
| log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", |
| (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); |
| } else { |
| log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.", |
| os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); |
| } |
| |
| pthread_attr_destroy(&attr); |
| |
| if (ret != 0) { |
| // Need to clean up stuff we've allocated so far |
| thread->set_osthread(NULL); |
| delete osthread; |
| return false; |
| } |
| |
| // Store pthread info into the OSThread |
| osthread->set_pthread_id(tid); |
| |
| // Wait until child thread is either initialized or aborted |
| { |
| Monitor* sync_with_child = osthread->startThread_lock(); |
| MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); |
| while ((state = osthread->get_state()) == ALLOCATED) { |
| sync_with_child->wait(Mutex::_no_safepoint_check_flag); |
| } |
| } |
| |
| } |
| |
| // Aborted due to thread limit being reached |
| if (state == ZOMBIE) { |
| thread->set_osthread(NULL); |
| delete osthread; |
| return false; |
| } |
| |
| // The thread is returned suspended (in state INITIALIZED), |
| // and is started higher up in the call chain |
| assert(state == INITIALIZED, "race condition"); |
| return true; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // attach existing thread |
| |
| // bootstrap the main thread |
| bool os::create_main_thread(JavaThread* thread) { |
| assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); |
| return create_attached_thread(thread); |
| } |
| |
| bool os::create_attached_thread(JavaThread* thread) { |
| #ifdef ASSERT |
| thread->verify_not_published(); |
| #endif |
| |
| // Allocate the OSThread object |
| OSThread* osthread = new OSThread(NULL, NULL); |
| |
| if (osthread == NULL) { |
| return false; |
| } |
| |
| osthread->set_thread_id(os::Bsd::gettid()); |
| |
| // Store pthread info into the OSThread |
| #ifdef __APPLE__ |
| uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
| guarantee(unique_thread_id != 0, "just checking"); |
| osthread->set_unique_thread_id(unique_thread_id); |
| #endif |
| osthread->set_pthread_id(::pthread_self()); |
| |
| // initialize floating point control register |
| os::Bsd::init_thread_fpu_state(); |
| |
| // Initial thread state is RUNNABLE |
| osthread->set_state(RUNNABLE); |
| |
| thread->set_osthread(osthread); |
| |
| // initialize signal mask for this thread |
| // and save the caller's signal mask |
| os::Bsd::hotspot_sigmask(thread); |
| |
| log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").", |
| os::current_thread_id(), (uintx) pthread_self()); |
| |
| return true; |
| } |
| |
| void os::pd_start_thread(Thread* thread) { |
| OSThread * osthread = thread->osthread(); |
| assert(osthread->get_state() != INITIALIZED, "just checking"); |
| Monitor* sync_with_child = osthread->startThread_lock(); |
| MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); |
| sync_with_child->notify(); |
| } |
| |
| // Free Bsd resources related to the OSThread |
| void os::free_thread(OSThread* osthread) { |
| assert(osthread != NULL, "osthread not set"); |
| |
| // We are told to free resources of the argument thread, |
| // but we can only really operate on the current thread. |
| assert(Thread::current()->osthread() == osthread, |
| "os::free_thread but not current thread"); |
| |
| // Restore caller's signal mask |
| sigset_t sigmask = osthread->caller_sigmask(); |
| pthread_sigmask(SIG_SETMASK, &sigmask, NULL); |
| |
| delete osthread; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // time support |
| |
| // Time since start-up in seconds to a fine granularity. |
| // Used by VMSelfDestructTimer and the MemProfiler. |
| double os::elapsedTime() { |
| |
| return ((double)os::elapsed_counter()) / os::elapsed_frequency(); |
| } |
| |
| jlong os::elapsed_counter() { |
| return javaTimeNanos() - initial_time_count; |
| } |
| |
| jlong os::elapsed_frequency() { |
| return NANOSECS_PER_SEC; // nanosecond resolution |
| } |
| |
| bool os::supports_vtime() { return true; } |
| bool os::enable_vtime() { return false; } |
| bool os::vtime_enabled() { return false; } |
| |
| double os::elapsedVTime() { |
| // better than nothing, but not much |
| return elapsedTime(); |
| } |
| |
| jlong os::javaTimeMillis() { |
| timeval time; |
| int status = gettimeofday(&time, NULL); |
| assert(status != -1, "bsd error"); |
| return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); |
| } |
| |
| void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { |
| timeval time; |
| int status = gettimeofday(&time, NULL); |
| assert(status != -1, "bsd error"); |
| seconds = jlong(time.tv_sec); |
| nanos = jlong(time.tv_usec) * 1000; |
| } |
| |
| #ifndef __APPLE__ |
| #ifndef CLOCK_MONOTONIC |
| #define CLOCK_MONOTONIC (1) |
| #endif |
| #endif |
| |
| #ifdef __APPLE__ |
| void os::Bsd::clock_init() { |
| mach_timebase_info(&_timebase_info); |
| } |
| #else |
| void os::Bsd::clock_init() { |
| struct timespec res; |
| struct timespec tp; |
| if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && |
| ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { |
| // yes, monotonic clock is supported |
| _clock_gettime = ::clock_gettime; |
| } |
| } |
| #endif |
| |
| |
| |
| #ifdef __APPLE__ |
| |
| jlong os::javaTimeNanos() { |
| const uint64_t tm = mach_absolute_time(); |
| const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; |
| const uint64_t prev = Bsd::_max_abstime; |
| if (now <= prev) { |
| return prev; // same or retrograde time; |
| } |
| const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev); |
| assert(obsv >= prev, "invariant"); // Monotonicity |
| // If the CAS succeeded then we're done and return "now". |
| // If the CAS failed and the observed value "obsv" is >= now then |
| // we should return "obsv". If the CAS failed and now > obsv > prv then |
| // some other thread raced this thread and installed a new value, in which case |
| // we could either (a) retry the entire operation, (b) retry trying to install now |
| // or (c) just return obsv. We use (c). No loop is required although in some cases |
| // we might discard a higher "now" value in deference to a slightly lower but freshly |
| // installed obsv value. That's entirely benign -- it admits no new orderings compared |
| // to (a) or (b) -- and greatly reduces coherence traffic. |
| // We might also condition (c) on the magnitude of the delta between obsv and now. |
| // Avoiding excessive CAS operations to hot RW locations is critical. |
| // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate |
| return (prev == obsv) ? now : obsv; |
| } |
| |
| #else // __APPLE__ |
| |
| jlong os::javaTimeNanos() { |
| if (os::supports_monotonic_clock()) { |
| struct timespec tp; |
| int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); |
| assert(status == 0, "gettime error"); |
| jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); |
| return result; |
| } else { |
| timeval time; |
| int status = gettimeofday(&time, NULL); |
| assert(status != -1, "bsd error"); |
| jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); |
| return 1000 * usecs; |
| } |
| } |
| |
| #endif // __APPLE__ |
| |
| void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { |
| if (os::supports_monotonic_clock()) { |
| info_ptr->max_value = ALL_64_BITS; |
| |
| // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past |
| info_ptr->may_skip_backward = false; // not subject to resetting or drifting |
| info_ptr->may_skip_forward = false; // not subject to resetting or drifting |
| } else { |
| // gettimeofday - based on time in seconds since the Epoch thus does not wrap |
| info_ptr->max_value = ALL_64_BITS; |
| |
| // gettimeofday is a real time clock so it skips |
| info_ptr->may_skip_backward = true; |
| info_ptr->may_skip_forward = true; |
| } |
| |
| info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time |
| } |
| |
| // Return the real, user, and system times in seconds from an |
| // arbitrary fixed point in the past. |
| bool os::getTimesSecs(double* process_real_time, |
| double* process_user_time, |
| double* process_system_time) { |
| struct tms ticks; |
| clock_t real_ticks = times(&ticks); |
| |
| if (real_ticks == (clock_t) (-1)) { |
| return false; |
| } else { |
| double ticks_per_second = (double) clock_tics_per_sec; |
| *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; |
| *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; |
| *process_real_time = ((double) real_ticks) / ticks_per_second; |
| |
| return true; |
| } |
| } |
| |
| |
| char * os::local_time_string(char *buf, size_t buflen) { |
| struct tm t; |
| time_t long_time; |
| time(&long_time); |
| localtime_r(&long_time, &t); |
| jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", |
| t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, |
| t.tm_hour, t.tm_min, t.tm_sec); |
| return buf; |
| } |
| |
| struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
| return localtime_r(clock, res); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // runtime exit support |
| |
| // Note: os::shutdown() might be called very early during initialization, or |
| // called from signal handler. Before adding something to os::shutdown(), make |
| // sure it is async-safe and can handle partially initialized VM. |
| void os::shutdown() { |
| |
| // allow PerfMemory to attempt cleanup of any persistent resources |
| perfMemory_exit(); |
| |
| // needs to remove object in file system |
| AttachListener::abort(); |
| |
| // flush buffered output, finish log files |
| ostream_abort(); |
| |
| // Check for abort hook |
| abort_hook_t abort_hook = Arguments::abort_hook(); |
| if (abort_hook != NULL) { |
| abort_hook(); |
| } |
| |
| } |
| |
| // Note: os::abort() might be called very early during initialization, or |
| // called from signal handler. Before adding something to os::abort(), make |
| // sure it is async-safe and can handle partially initialized VM. |
| void os::abort(bool dump_core, void* siginfo, const void* context) { |
| os::shutdown(); |
| if (dump_core) { |
| #ifndef PRODUCT |
| fdStream out(defaultStream::output_fd()); |
| out.print_raw("Current thread is "); |
| char buf[16]; |
| jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); |
| out.print_raw_cr(buf); |
| out.print_raw_cr("Dumping core ..."); |
| #endif |
| ::abort(); // dump core |
| } |
| |
| ::exit(1); |
| } |
| |
| // Die immediately, no exit hook, no abort hook, no cleanup. |
| void os::die() { |
| // _exit() on BsdThreads only kills current thread |
| ::abort(); |
| } |
| |
| // This method is a copy of JDK's sysGetLastErrorString |
| // from src/solaris/hpi/src/system_md.c |
| |
| size_t os::lasterror(char *buf, size_t len) { |
| if (errno == 0) return 0; |
| |
| const char *s = os::strerror(errno); |
| size_t n = ::strlen(s); |
| if (n >= len) { |
| n = len - 1; |
| } |
| ::strncpy(buf, s, n); |
| buf[n] = '\0'; |
| return n; |
| } |
| |
| // Information of current thread in variety of formats |
| pid_t os::Bsd::gettid() { |
| int retval = -1; |
| |
| #ifdef __APPLE__ //XNU kernel |
| // despite the fact mach port is actually not a thread id use it |
| // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 |
| retval = ::pthread_mach_thread_np(::pthread_self()); |
| guarantee(retval != 0, "just checking"); |
| return retval; |
| |
| #else |
| #ifdef __FreeBSD__ |
| retval = syscall(SYS_thr_self); |
| #else |
| #ifdef __OpenBSD__ |
| retval = syscall(SYS_getthrid); |
| #else |
| #ifdef __NetBSD__ |
| retval = (pid_t) syscall(SYS__lwp_self); |
| #endif |
| #endif |
| #endif |
| #endif |
| |
| if (retval == -1) { |
| return getpid(); |
| } |
| } |
| |
| intx os::current_thread_id() { |
| #ifdef __APPLE__ |
| return (intx)::pthread_mach_thread_np(::pthread_self()); |
| #else |
| return (intx)::pthread_self(); |
| #endif |
| } |
| |
| int os::current_process_id() { |
| |
| // Under the old bsd thread library, bsd gives each thread |
| // its own process id. Because of this each thread will return |
| // a different pid if this method were to return the result |
| // of getpid(2). Bsd provides no api that returns the pid |
| // of the launcher thread for the vm. This implementation |
| // returns a unique pid, the pid of the launcher thread |
| // that starts the vm 'process'. |
| |
| // Under the NPTL, getpid() returns the same pid as the |
| // launcher thread rather than a unique pid per thread. |
| // Use gettid() if you want the old pre NPTL behaviour. |
| |
| // if you are looking for the result of a call to getpid() that |
| // returns a unique pid for the calling thread, then look at the |
| // OSThread::thread_id() method in osThread_bsd.hpp file |
| |
| return (int)(_initial_pid ? _initial_pid : getpid()); |
| } |
| |
| // DLL functions |
| |
| const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } |
| |
| // This must be hard coded because it's the system's temporary |
| // directory not the java application's temp directory, ala java.io.tmpdir. |
| #ifdef __APPLE__ |
| // macosx has a secure per-user temporary directory |
| char temp_path_storage[PATH_MAX]; |
| const char* os::get_temp_directory() { |
| static char *temp_path = NULL; |
| if (temp_path == NULL) { |
| int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); |
| if (pathSize == 0 || pathSize > PATH_MAX) { |
| strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); |
| } |
| temp_path = temp_path_storage; |
| } |
| return temp_path; |
| } |
| #else // __APPLE__ |
| const char* os::get_temp_directory() { return "/tmp"; } |
| #endif // __APPLE__ |
| |
| // check if addr is inside libjvm.so |
| bool os::address_is_in_vm(address addr) { |
| static address libjvm_base_addr; |
| Dl_info dlinfo; |
| |
| if (libjvm_base_addr == NULL) { |
| if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
| libjvm_base_addr = (address)dlinfo.dli_fbase; |
| } |
| assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
| } |
| |
| if (dladdr((void *)addr, &dlinfo) != 0) { |
| if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
| } |
| |
| return false; |
| } |
| |
| |
| #define MACH_MAXSYMLEN 256 |
| |
| bool os::dll_address_to_function_name(address addr, char *buf, |
| int buflen, int *offset, |
| bool demangle) { |
| // buf is not optional, but offset is optional |
| assert(buf != NULL, "sanity check"); |
| |
| Dl_info dlinfo; |
| char localbuf[MACH_MAXSYMLEN]; |
| |
| if (dladdr((void*)addr, &dlinfo) != 0) { |
| // see if we have a matching symbol |
| if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
| if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { |
| jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
| } |
| if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
| return true; |
| } |
| // no matching symbol so try for just file info |
| if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
| if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
| buf, buflen, offset, dlinfo.dli_fname, demangle)) { |
| return true; |
| } |
| } |
| |
| // Handle non-dynamic manually: |
| if (dlinfo.dli_fbase != NULL && |
| Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, |
| dlinfo.dli_fbase)) { |
| if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) { |
| jio_snprintf(buf, buflen, "%s", localbuf); |
| } |
| return true; |
| } |
| } |
| buf[0] = '\0'; |
| if (offset != NULL) *offset = -1; |
| return false; |
| } |
| |
| // ported from solaris version |
| bool os::dll_address_to_library_name(address addr, char* buf, |
| int buflen, int* offset) { |
| // buf is not optional, but offset is optional |
| assert(buf != NULL, "sanity check"); |
| |
| Dl_info dlinfo; |
| |
| if (dladdr((void*)addr, &dlinfo) != 0) { |
| if (dlinfo.dli_fname != NULL) { |
| jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
| } |
| if (dlinfo.dli_fbase != NULL && offset != NULL) { |
| *offset = addr - (address)dlinfo.dli_fbase; |
| } |
| return true; |
| } |
| |
| buf[0] = '\0'; |
| if (offset) *offset = -1; |
| return false; |
| } |
| |
| // Loads .dll/.so and |
| // in case of error it checks if .dll/.so was built for the |
| // same architecture as Hotspot is running on |
| |
| #ifdef __APPLE__ |
| void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { |
| #ifdef STATIC_BUILD |
| return os::get_default_process_handle(); |
| #else |
| void * result= ::dlopen(filename, RTLD_LAZY); |
| if (result != NULL) { |
| // Successful loading |
| return result; |
| } |
| |
| // Read system error message into ebuf |
| ::strncpy(ebuf, ::dlerror(), ebuflen-1); |
| ebuf[ebuflen-1]='\0'; |
| |
| return NULL; |
| #endif // STATIC_BUILD |
| } |
| #else |
| void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { |
| #ifdef STATIC_BUILD |
| return os::get_default_process_handle(); |
| #else |
| void * result= ::dlopen(filename, RTLD_LAZY); |
| if (result != NULL) { |
| // Successful loading |
| return result; |
| } |
| |
| Elf32_Ehdr elf_head; |
| |
| // Read system error message into ebuf |
| // It may or may not be overwritten below |
| ::strncpy(ebuf, ::dlerror(), ebuflen-1); |
| ebuf[ebuflen-1]='\0'; |
| int diag_msg_max_length=ebuflen-strlen(ebuf); |
| char* diag_msg_buf=ebuf+strlen(ebuf); |
| |
| if (diag_msg_max_length==0) { |
| // No more space in ebuf for additional diagnostics message |
| return NULL; |
| } |
| |
| |
| int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); |
| |
| if (file_descriptor < 0) { |
| // Can't open library, report dlerror() message |
| return NULL; |
| } |
| |
| bool failed_to_read_elf_head= |
| (sizeof(elf_head)!= |
| (::read(file_descriptor, &elf_head,sizeof(elf_head)))); |
| |
| ::close(file_descriptor); |
| if (failed_to_read_elf_head) { |
| // file i/o error - report dlerror() msg |
| return NULL; |
| } |
| |
| typedef struct { |
| Elf32_Half code; // Actual value as defined in elf.h |
| Elf32_Half compat_class; // Compatibility of archs at VM's sense |
| char elf_class; // 32 or 64 bit |
| char endianess; // MSB or LSB |
| char* name; // String representation |
| } arch_t; |
| |
| #ifndef EM_486 |
| #define EM_486 6 /* Intel 80486 */ |
| #endif |
| |
| #ifndef EM_MIPS_RS3_LE |
| #define EM_MIPS_RS3_LE 10 /* MIPS */ |
| #endif |
| |
| #ifndef EM_PPC64 |
| #define EM_PPC64 21 /* PowerPC64 */ |
| #endif |
| |
| #ifndef EM_S390 |
| #define EM_S390 22 /* IBM System/390 */ |
| #endif |
| |
| #ifndef EM_IA_64 |
| #define EM_IA_64 50 /* HP/Intel IA-64 */ |
| #endif |
| |
| #ifndef EM_X86_64 |
| #define EM_X86_64 62 /* AMD x86-64 */ |
| #endif |
| |
| static const arch_t arch_array[]={ |
| {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, |
| {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, |
| {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, |
| {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, |
| {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, |
| {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, |
| {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, |
| {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, |
| {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
| {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, |
| {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, |
| {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, |
| {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, |
| {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, |
| {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, |
| {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} |
| }; |
| |
| #if (defined IA32) |
| static Elf32_Half running_arch_code=EM_386; |
| #elif (defined AMD64) |
| static Elf32_Half running_arch_code=EM_X86_64; |
| #elif (defined IA64) |
| static Elf32_Half running_arch_code=EM_IA_64; |
| #elif (defined __sparc) && (defined _LP64) |
| static Elf32_Half running_arch_code=EM_SPARCV9; |
| #elif (defined __sparc) && (!defined _LP64) |
| static Elf32_Half running_arch_code=EM_SPARC; |
| #elif (defined __powerpc64__) |
| static Elf32_Half running_arch_code=EM_PPC64; |
| #elif (defined __powerpc__) |
| static Elf32_Half running_arch_code=EM_PPC; |
| #elif (defined ARM) |
| static Elf32_Half running_arch_code=EM_ARM; |
| #elif (defined S390) |
| static Elf32_Half running_arch_code=EM_S390; |
| #elif (defined ALPHA) |
| static Elf32_Half running_arch_code=EM_ALPHA; |
| #elif (defined MIPSEL) |
| static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; |
| #elif (defined PARISC) |
| static Elf32_Half running_arch_code=EM_PARISC; |
| #elif (defined MIPS) |
| static Elf32_Half running_arch_code=EM_MIPS; |
| #elif (defined M68K) |
| static Elf32_Half running_arch_code=EM_68K; |
| #else |
| #error Method os::dll_load requires that one of following is defined:\ |
| IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
| #endif |
| |
| // Identify compatability class for VM's architecture and library's architecture |
| // Obtain string descriptions for architectures |
| |
| arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; |
| int running_arch_index=-1; |
| |
| for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { |
| if (running_arch_code == arch_array[i].code) { |
| running_arch_index = i; |
| } |
| if (lib_arch.code == arch_array[i].code) { |
| lib_arch.compat_class = arch_array[i].compat_class; |
| lib_arch.name = arch_array[i].name; |
| } |
| } |
| |
| assert(running_arch_index != -1, |
| "Didn't find running architecture code (running_arch_code) in arch_array"); |
| if (running_arch_index == -1) { |
| // Even though running architecture detection failed |
| // we may still continue with reporting dlerror() message |
| return NULL; |
| } |
| |
| if (lib_arch.endianess != arch_array[running_arch_index].endianess) { |
| ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); |
| return NULL; |
| } |
| |
| #ifndef S390 |
| if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
| ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); |
| return NULL; |
| } |
| #endif // !S390 |
| |
| if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { |
| if (lib_arch.name!=NULL) { |
| ::snprintf(diag_msg_buf, diag_msg_max_length-1, |
| " (Possible cause: can't load %s-bit .so on a %s-bit platform)", |
| lib_arch.name, arch_array[running_arch_index].name); |
| } else { |
| ::snprintf(diag_msg_buf, diag_msg_max_length-1, |
| " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", |
| lib_arch.code, |
| arch_array[running_arch_index].name); |
| } |
| } |
| |
| return NULL; |
| #endif // STATIC_BUILD |
| } |
| #endif // !__APPLE__ |
| |
| void* os::get_default_process_handle() { |
| #ifdef __APPLE__ |
| // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY |
| // to avoid finding unexpected symbols on second (or later) |
| // loads of a library. |
| return (void*)::dlopen(NULL, RTLD_FIRST); |
| #else |
| return (void*)::dlopen(NULL, RTLD_LAZY); |
| #endif |
| } |
| |
| // XXX: Do we need a lock around this as per Linux? |
| void* os::dll_lookup(void* handle, const char* name) { |
| return dlsym(handle, name); |
| } |
| |
| int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { |
| outputStream * out = (outputStream *) param; |
| out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name); |
| return 0; |
| } |
| |
| void os::print_dll_info(outputStream *st) { |
| st->print_cr("Dynamic libraries:"); |
| if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { |
| st->print_cr("Error: Cannot print dynamic libraries."); |
| } |
| } |
| |
| int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { |
| #ifdef RTLD_DI_LINKMAP |
| Dl_info dli; |
| void *handle; |
| Link_map *map; |
| Link_map *p; |
| |
| if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || |
| dli.dli_fname == NULL) { |
| return 1; |
| } |
| handle = dlopen(dli.dli_fname, RTLD_LAZY); |
| if (handle == NULL) { |
| return 1; |
| } |
| dlinfo(handle, RTLD_DI_LINKMAP, &map); |
| if (map == NULL) { |
| dlclose(handle); |
| return 1; |
| } |
| |
| while (map->l_prev != NULL) |
| map = map->l_prev; |
| |
| while (map != NULL) { |
| // Value for top_address is returned as 0 since we don't have any information about module size |
| if (callback(map->l_name, (address)map->l_addr, (address)0, param)) { |
| dlclose(handle); |
| return 1; |
| } |
| map = map->l_next; |
| } |
| |
| dlclose(handle); |
| #elif defined(__APPLE__) |
| for (uint32_t i = 1; i < _dyld_image_count(); i++) { |
| // Value for top_address is returned as 0 since we don't have any information about module size |
| if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) { |
| return 1; |
| } |
| } |
| return 0; |
| #else |
| return 1; |
| #endif |
| } |
| |
| void os::get_summary_os_info(char* buf, size_t buflen) { |
| // These buffers are small because we want this to be brief |
| // and not use a lot of stack while generating the hs_err file. |
| char os[100]; |
| size_t size = sizeof(os); |
| int mib_kern[] = { CTL_KERN, KERN_OSTYPE }; |
| if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) { |
| #ifdef __APPLE__ |
| strncpy(os, "Darwin", sizeof(os)); |
| #elif __OpenBSD__ |
| strncpy(os, "OpenBSD", sizeof(os)); |
| #else |
| strncpy(os, "BSD", sizeof(os)); |
| #endif |
| } |
| |
| char release[100]; |
| size = sizeof(release); |
| int mib_release[] = { CTL_KERN, KERN_OSRELEASE }; |
| if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) { |
| // if error, leave blank |
| strncpy(release, "", sizeof(release)); |
| } |
| snprintf(buf, buflen, "%s %s", os, release); |
| } |
| |
| void os::print_os_info_brief(outputStream* st) { |
| os::Posix::print_uname_info(st); |
| } |
| |
| void os::print_os_info(outputStream* st) { |
| st->print("OS:"); |
| |
| os::Posix::print_uname_info(st); |
| |
| os::Posix::print_rlimit_info(st); |
| |
| os::Posix::print_load_average(st); |
| } |
| |
| void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { |
| // Nothing to do for now. |
| } |
| |
| void os::get_summary_cpu_info(char* buf, size_t buflen) { |
| unsigned int mhz; |
| size_t size = sizeof(mhz); |
| int mib[] = { CTL_HW, HW_CPU_FREQ }; |
| if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) { |
| mhz = 1; // looks like an error but can be divided by |
| } else { |
| mhz /= 1000000; // reported in millions |
| } |
| |
| char model[100]; |
| size = sizeof(model); |
| int mib_model[] = { CTL_HW, HW_MODEL }; |
| if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) { |
| strncpy(model, cpu_arch, sizeof(model)); |
| } |
| |
| char machine[100]; |
| size = sizeof(machine); |
| int mib_machine[] = { CTL_HW, HW_MACHINE }; |
| if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) { |
| strncpy(machine, "", sizeof(machine)); |
| } |
| |
| snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz); |
| } |
| |
| void os::print_memory_info(outputStream* st) { |
| |
| st->print("Memory:"); |
| st->print(" %dk page", os::vm_page_size()>>10); |
| |
| st->print(", physical " UINT64_FORMAT "k", |
| os::physical_memory() >> 10); |
| st->print("(" UINT64_FORMAT "k free)", |
| os::available_memory() >> 10); |
| st->cr(); |
| } |
| |
| static void print_signal_handler(outputStream* st, int sig, |
| char* buf, size_t buflen); |
| |
| void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { |
| st->print_cr("Signal Handlers:"); |
| print_signal_handler(st, SIGSEGV, buf, buflen); |
| print_signal_handler(st, SIGBUS , buf, buflen); |
| print_signal_handler(st, SIGFPE , buf, buflen); |
| print_signal_handler(st, SIGPIPE, buf, buflen); |
| print_signal_handler(st, SIGXFSZ, buf, buflen); |
| print_signal_handler(st, SIGILL , buf, buflen); |
| print_signal_handler(st, SR_signum, buf, buflen); |
| print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); |
| print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); |
| print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); |
| print_signal_handler(st, BREAK_SIGNAL, buf, buflen); |
| } |
| |
| static char saved_jvm_path[MAXPATHLEN] = {0}; |
| |
| // Find the full path to the current module, libjvm |
| void os::jvm_path(char *buf, jint buflen) { |
| // Error checking. |
| if (buflen < MAXPATHLEN) { |
| assert(false, "must use a large-enough buffer"); |
| buf[0] = '\0'; |
| return; |
| } |
| // Lazy resolve the path to current module. |
| if (saved_jvm_path[0] != 0) { |
| strcpy(buf, saved_jvm_path); |
| return; |
| } |
| |
| char dli_fname[MAXPATHLEN]; |
| bool ret = dll_address_to_library_name( |
| CAST_FROM_FN_PTR(address, os::jvm_path), |
| dli_fname, sizeof(dli_fname), NULL); |
| assert(ret, "cannot locate libjvm"); |
| char *rp = NULL; |
| if (ret && dli_fname[0] != '\0') { |
| rp = os::Posix::realpath(dli_fname, buf, buflen); |
| } |
| if (rp == NULL) { |
| return; |
| } |
| |
| if (Arguments::sun_java_launcher_is_altjvm()) { |
| // Support for the java launcher's '-XXaltjvm=<path>' option. Typical |
| // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" |
| // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" |
| // appears at the right place in the string, then assume we are |
| // installed in a JDK and we're done. Otherwise, check for a |
| // JAVA_HOME environment variable and construct a path to the JVM |
| // being overridden. |
| |
| const char *p = buf + strlen(buf) - 1; |
| for (int count = 0; p > buf && count < 5; ++count) { |
| for (--p; p > buf && *p != '/'; --p) |
| /* empty */ ; |
| } |
| |
| if (strncmp(p, "/jre/lib/", 9) != 0) { |
| // Look for JAVA_HOME in the environment. |
| char* java_home_var = ::getenv("JAVA_HOME"); |
| if (java_home_var != NULL && java_home_var[0] != 0) { |
| char* jrelib_p; |
| int len; |
| |
| // Check the current module name "libjvm" |
| p = strrchr(buf, '/'); |
| assert(strstr(p, "/libjvm") == p, "invalid library name"); |
| |
| rp = os::Posix::realpath(java_home_var, buf, buflen); |
| if (rp == NULL) { |
| return; |
| } |
| |
| // determine if this is a legacy image or modules image |
| // modules image doesn't have "jre" subdirectory |
| len = strlen(buf); |
| assert(len < buflen, "Ran out of buffer space"); |
| jrelib_p = buf + len; |
| |
| // Add the appropriate library subdir |
| snprintf(jrelib_p, buflen-len, "/jre/lib"); |
| if (0 != access(buf, F_OK)) { |
| snprintf(jrelib_p, buflen-len, "/lib"); |
| } |
| |
| // Add the appropriate client or server subdir |
| len = strlen(buf); |
| jrelib_p = buf + len; |
| snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); |
| if (0 != access(buf, F_OK)) { |
| snprintf(jrelib_p, buflen-len, "%s", ""); |
| } |
| |
| // If the path exists within JAVA_HOME, add the JVM library name |
| // to complete the path to JVM being overridden. Otherwise fallback |
| // to the path to the current library. |
| if (0 == access(buf, F_OK)) { |
| // Use current module name "libjvm" |
| len = strlen(buf); |
| snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
| } else { |
| // Fall back to path of current library |
| rp = os::Posix::realpath(dli_fname, buf, buflen); |
| if (rp == NULL) { |
| return; |
| } |
| } |
| } |
| } |
| } |
| |
| strncpy(saved_jvm_path, buf, MAXPATHLEN); |
| saved_jvm_path[MAXPATHLEN - 1] = '\0'; |
| } |
| |
| void os::print_jni_name_prefix_on(outputStream* st, int args_size) { |
| // no prefix required, not even "_" |
| } |
| |
| void os::print_jni_name_suffix_on(outputStream* st, int args_size) { |
| // no suffix required |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // sun.misc.Signal support |
| |
| static volatile jint sigint_count = 0; |
| |
| static void UserHandler(int sig, void *siginfo, void *context) { |
| // 4511530 - sem_post is serialized and handled by the manager thread. When |
| // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We |
| // don't want to flood the manager thread with sem_post requests. |
| if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) { |
| return; |
| } |
| |
| // Ctrl-C is pressed during error reporting, likely because the error |
| // handler fails to abort. Let VM die immediately. |
| if (sig == SIGINT && VMError::is_error_reported()) { |
| os::die(); |
| } |
| |
| os::signal_notify(sig); |
| } |
| |
| void* os::user_handler() { |
| return CAST_FROM_FN_PTR(void*, UserHandler); |
| } |
| |
| extern "C" { |
| typedef void (*sa_handler_t)(int); |
| typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); |
| } |
| |
| void* os::signal(int signal_number, void* handler) { |
| struct sigaction sigAct, oldSigAct; |
| |
| sigfillset(&(sigAct.sa_mask)); |
| sigAct.sa_flags = SA_RESTART|SA_SIGINFO; |
| sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); |
| |
| if (sigaction(signal_number, &sigAct, &oldSigAct)) { |
| // -1 means registration failed |
| return (void *)-1; |
| } |
| |
| return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); |
| } |
| |
| void os::signal_raise(int signal_number) { |
| ::raise(signal_number); |
| } |
| |
| // The following code is moved from os.cpp for making this |
| // code platform specific, which it is by its very nature. |
| |
| // Will be modified when max signal is changed to be dynamic |
| int os::sigexitnum_pd() { |
| return NSIG; |
| } |
| |
| // a counter for each possible signal value |
| static volatile jint pending_signals[NSIG+1] = { 0 }; |
| |
| // Bsd(POSIX) specific hand shaking semaphore. |
| #ifdef __APPLE__ |
| typedef semaphore_t os_semaphore_t; |
| |
| #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
| #define SEM_WAIT(sem) semaphore_wait(sem) |
| #define SEM_POST(sem) semaphore_signal(sem) |
| #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) |
| #else |
| typedef sem_t os_semaphore_t; |
| |
| #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
| #define SEM_WAIT(sem) sem_wait(&sem) |
| #define SEM_POST(sem) sem_post(&sem) |
| #define SEM_DESTROY(sem) sem_destroy(&sem) |
| #endif |
| |
| #ifdef __APPLE__ |
| // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. |
| |
| static const char* sem_init_strerror(kern_return_t value) { |
| switch (value) { |
| case KERN_INVALID_ARGUMENT: return "Invalid argument"; |
| case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; |
| default: return "Unknown"; |
| } |
| } |
| |
| OSXSemaphore::OSXSemaphore(uint value) { |
| kern_return_t ret = SEM_INIT(_semaphore, value); |
| |
| guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); |
| } |
| |
| OSXSemaphore::~OSXSemaphore() { |
| SEM_DESTROY(_semaphore); |
| } |
| |
| void OSXSemaphore::signal(uint count) { |
| for (uint i = 0; i < count; i++) { |
| kern_return_t ret = SEM_POST(_semaphore); |
| |
| assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); |
| } |
| } |
| |
| void OSXSemaphore::wait() { |
| kern_return_t ret; |
| while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) { |
| // Semaphore was interrupted. Retry. |
| } |
| assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); |
| } |
| |
| jlong OSXSemaphore::currenttime() { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); |
| } |
| |
| bool OSXSemaphore::trywait() { |
| return timedwait(0, 0); |
| } |
| |
| bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { |
| kern_return_t kr = KERN_ABORTED; |
| mach_timespec_t waitspec; |
| waitspec.tv_sec = sec; |
| waitspec.tv_nsec = nsec; |
| |
| jlong starttime = currenttime(); |
| |
| kr = semaphore_timedwait(_semaphore, waitspec); |
| while (kr == KERN_ABORTED) { |
| jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; |
| |
| jlong current = currenttime(); |
| jlong passedtime = current - starttime; |
| |
| if (passedtime >= totalwait) { |
| waitspec.tv_sec = 0; |
| waitspec.tv_nsec = 0; |
| } else { |
| jlong waittime = totalwait - (current - starttime); |
| waitspec.tv_sec = waittime / NANOSECS_PER_SEC; |
| waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; |
| } |
| |
| kr = semaphore_timedwait(_semaphore, waitspec); |
| } |
| |
| return kr == KERN_SUCCESS; |
| } |
| |
| #else |
| // Use POSIX implementation of semaphores. |
| |
| struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { |
| struct timespec ts; |
| unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); |
| |
| return ts; |
| } |
| |
| #endif // __APPLE__ |
| |
| static os_semaphore_t sig_sem; |
| |
| #ifdef __APPLE__ |
| static OSXSemaphore sr_semaphore; |
| #else |
| static PosixSemaphore sr_semaphore; |
| #endif |
| |
| void os::signal_init_pd() { |
| // Initialize signal structures |
| ::memset((void*)pending_signals, 0, sizeof(pending_signals)); |
| |
| // Initialize signal semaphore |
| ::SEM_INIT(sig_sem, 0); |
| } |
| |
| void os::signal_notify(int sig) { |
| Atomic::inc(&pending_signals[sig]); |
| ::SEM_POST(sig_sem); |
| } |
| |
| static int check_pending_signals(bool wait) { |
| Atomic::store(0, &sigint_count); |
| for (;;) { |
| for (int i = 0; i < NSIG + 1; i++) { |
| jint n = pending_signals[i]; |
| if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { |
| return i; |
| } |
| } |
| if (!wait) { |
| return -1; |
| } |
| JavaThread *thread = JavaThread::current(); |
| ThreadBlockInVM tbivm(thread); |
| |
| bool threadIsSuspended; |
| do { |
| thread->set_suspend_equivalent(); |
| // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() |
| ::SEM_WAIT(sig_sem); |
| |
| // were we externally suspended while we were waiting? |
| threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); |
| if (threadIsSuspended) { |
| // The semaphore has been incremented, but while we were waiting |
| // another thread suspended us. We don't want to continue running |
| // while suspended because that would surprise the thread that |
| // suspended us. |
| ::SEM_POST(sig_sem); |
| |
| thread->java_suspend_self(); |
| } |
| } while (threadIsSuspended); |
| } |
| } |
| |
| int os::signal_lookup() { |
| return check_pending_signals(false); |
| } |
| |
| int os::signal_wait() { |
| return check_pending_signals(true); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Virtual Memory |
| |
| int os::vm_page_size() { |
| // Seems redundant as all get out |
| assert(os::Bsd::page_size() != -1, "must call os::init"); |
| return os::Bsd::page_size(); |
| } |
| |
| // Solaris allocates memory by pages. |
| int os::vm_allocation_granularity() { |
| assert(os::Bsd::page_size() != -1, "must call os::init"); |
| return os::Bsd::page_size(); |
| } |
| |
| // Rationale behind this function: |
| // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable |
| // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get |
| // samples for JITted code. Here we create private executable mapping over the code cache |
| // and then we can use standard (well, almost, as mapping can change) way to provide |
| // info for the reporting script by storing timestamp and location of symbol |
| void bsd_wrap_code(char* base, size_t size) { |
| static volatile jint cnt = 0; |
| |
| if (!UseOprofile) { |
| return; |
| } |
| |
| char buf[PATH_MAX + 1]; |
| int num = Atomic::add(1, &cnt); |
| |
| snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", |
| os::get_temp_directory(), os::current_process_id(), num); |
| unlink(buf); |
| |
| int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
| |
| if (fd != -1) { |
| off_t rv = ::lseek(fd, size-2, SEEK_SET); |
| if (rv != (off_t)-1) { |
| if (::write(fd, "", 1) == 1) { |
| mmap(base, size, |
| PROT_READ|PROT_WRITE|PROT_EXEC, |
| MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); |
| } |
| } |
| ::close(fd); |
| unlink(buf); |
| } |
| } |
| |
| static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
| int err) { |
| warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT |
| ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec, |
| os::errno_name(err), err); |
| } |
| |
| // NOTE: Bsd kernel does not really reserve the pages for us. |
| // All it does is to check if there are enough free pages |
| // left at the time of mmap(). This could be a potential |
| // problem. |
| bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| #ifdef __OpenBSD__ |
| // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD |
| if (::mprotect(addr, size, prot) == 0) { |
| return true; |
| } |
| #else |
| uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, |
| MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
| if (res != (uintptr_t) MAP_FAILED) { |
| return true; |
| } |
| #endif |
| |
| // Warn about any commit errors we see in non-product builds just |
| // in case mmap() doesn't work as described on the man page. |
| NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) |
| |
| return false; |
| } |
| |
| bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| bool exec) { |
| // alignment_hint is ignored on this OS |
| return pd_commit_memory(addr, size, exec); |
| } |
| |
| void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
| const char* mesg) { |
| assert(mesg != NULL, "mesg must be specified"); |
| if (!pd_commit_memory(addr, size, exec)) { |
| // add extra info in product mode for vm_exit_out_of_memory(): |
| PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) |
| vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); |
| } |
| } |
| |
| void os::pd_commit_memory_or_exit(char* addr, size_t size, |
| size_t alignment_hint, bool exec, |
| const char* mesg) { |
| // alignment_hint is ignored on this OS |
| pd_commit_memory_or_exit(addr, size, exec, mesg); |
| } |
| |
| void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| } |
| |
| void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| ::madvise(addr, bytes, MADV_DONTNEED); |
| } |
| |
| void os::numa_make_global(char *addr, size_t bytes) { |
| } |
| |
| void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { |
| } |
| |
| bool os::numa_topology_changed() { return false; } |
| |
| size_t os::numa_get_groups_num() { |
| return 1; |
| } |
| |
| int os::numa_get_group_id() { |
| return 0; |
| } |
| |
| size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
| if (size > 0) { |
| ids[0] = 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| bool os::get_page_info(char *start, page_info* info) { |
| return false; |
| } |
| |
| char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { |
| return end; |
| } |
| |
| |
| bool os::pd_uncommit_memory(char* addr, size_t size) { |
| #ifdef __OpenBSD__ |
| // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD |
| return ::mprotect(addr, size, PROT_NONE) == 0; |
| #else |
| uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
| MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
| return res != (uintptr_t) MAP_FAILED; |
| #endif |
| } |
| |
| bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
| return os::commit_memory(addr, size, !ExecMem); |
| } |
| |
| // If this is a growable mapping, remove the guard pages entirely by |
| // munmap()ping them. If not, just call uncommit_memory(). |
| bool os::remove_stack_guard_pages(char* addr, size_t size) { |
| return os::uncommit_memory(addr, size); |
| } |
| |
| // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory |
| // at 'requested_addr'. If there are existing memory mappings at the same |
| // location, however, they will be overwritten. If 'fixed' is false, |
| // 'requested_addr' is only treated as a hint, the return value may or |
| // may not start from the requested address. Unlike Bsd mmap(), this |
| // function returns NULL to indicate failure. |
| static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { |
| char * addr; |
| int flags; |
| |
| flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; |
| if (fixed) { |
| assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); |
| flags |= MAP_FIXED; |
| } |
| |
| // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
| // touch an uncommitted page. Otherwise, the read/write might |
| // succeed if we have enough swap space to back the physical page. |
| addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, |
| flags, -1, 0); |
| |
| return addr == MAP_FAILED ? NULL : addr; |
| } |
| |
| static int anon_munmap(char * addr, size_t size) { |
| return ::munmap(addr, size) == 0; |
| } |
| |
| char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| size_t alignment_hint) { |
| return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); |
| } |
| |
| bool os::pd_release_memory(char* addr, size_t size) { |
| return anon_munmap(addr, size); |
| } |
| |
| static bool bsd_mprotect(char* addr, size_t size, int prot) { |
| // Bsd wants the mprotect address argument to be page aligned. |
| char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size()); |
| |
| // According to SUSv3, mprotect() should only be used with mappings |
| // established by mmap(), and mmap() always maps whole pages. Unaligned |
| // 'addr' likely indicates problem in the VM (e.g. trying to change |
| // protection of malloc'ed or statically allocated memory). Check the |
| // caller if you hit this assert. |
| assert(addr == bottom, "sanity check"); |
| |
| size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); |
| return ::mprotect(bottom, size, prot) == 0; |
| } |
| |
| // Set protections specified |
| bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
| bool is_committed) { |
| unsigned int p = 0; |
| switch (prot) { |
| case MEM_PROT_NONE: p = PROT_NONE; break; |
| case MEM_PROT_READ: p = PROT_READ; break; |
| case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
| case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; |
| default: |
| ShouldNotReachHere(); |
| } |
| // is_committed is unused. |
| return bsd_mprotect(addr, bytes, p); |
| } |
| |
| bool os::guard_memory(char* addr, size_t size) { |
| return bsd_mprotect(addr, size, PROT_NONE); |
| } |
| |
| bool os::unguard_memory(char* addr, size_t size) { |
| return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); |
| } |
| |
| bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { |
| return false; |
| } |
| |
| // Large page support |
| |
| static size_t _large_page_size = 0; |
| |
| void os::large_page_init() { |
| } |
| |
| |
| char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
| fatal("This code is not used or maintained."); |
| |
| // "exec" is passed in but not used. Creating the shared image for |
| // the code cache doesn't have an SHM_X executable permission to check. |
| assert(UseLargePages && UseSHM, "only for SHM large pages"); |
| |
| key_t key = IPC_PRIVATE; |
| char *addr; |
| |
| bool warn_on_failure = UseLargePages && |
| (!FLAG_IS_DEFAULT(UseLargePages) || |
| !FLAG_IS_DEFAULT(LargePageSizeInBytes)); |
| |
| // Create a large shared memory region to attach to based on size. |
| // Currently, size is the total size of the heap |
| int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); |
| if (shmid == -1) { |
| // Possible reasons for shmget failure: |
| // 1. shmmax is too small for Java heap. |
| // > check shmmax value: cat /proc/sys/kernel/shmmax |
| // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax |
| // 2. not enough large page memory. |
| // > check available large pages: cat /proc/meminfo |
| // > increase amount of large pages: |
| // echo new_value > /proc/sys/vm/nr_hugepages |
| // Note 1: different Bsd may use different name for this property, |
| // e.g. on Redhat AS-3 it is "hugetlb_pool". |
| // Note 2: it's possible there's enough physical memory available but |
| // they are so fragmented after a long run that they can't |
| // coalesce into large pages. Try to reserve large pages when |
| // the system is still "fresh". |
| if (warn_on_failure) { |
| warning("Failed to reserve shared memory (errno = %d).", errno); |
| } |
| return NULL; |
| } |
| |
| // attach to the region |
| addr = (char*)shmat(shmid, req_addr, 0); |
| int err = errno; |
| |
| // Remove shmid. If shmat() is successful, the actual shared memory segment |
| // will be deleted when it's detached by shmdt() or when the process |
| // terminates. If shmat() is not successful this will remove the shared |
| // segment immediately. |
| shmctl(shmid, IPC_RMID, NULL); |
| |
| if ((intptr_t)addr == -1) { |
| if (warn_on_failure) { |
| warning("Failed to attach shared memory (errno = %d).", err); |
| } |
| return NULL; |
| } |
| |
| // The memory is committed |
| MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); |
| |
| return addr; |
| } |
| |
| bool os::release_memory_special(char* base, size_t bytes) { |
| if (MemTracker::tracking_level() > NMT_minimal) { |
| Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
| // detaching the SHM segment will also delete it, see reserve_memory_special() |
| int rslt = shmdt(base); |
| if (rslt == 0) { |
| tkr.record((address)base, bytes); |
| return true; |
| } else { |
| return false; |
| } |
| } else { |
| return shmdt(base) == 0; |
| } |
| } |
| |
| size_t os::large_page_size() { |
| return _large_page_size; |
| } |
| |
| // HugeTLBFS allows application to commit large page memory on demand; |
| // with SysV SHM the entire memory region must be allocated as shared |
| // memory. |
| bool os::can_commit_large_page_memory() { |
| return UseHugeTLBFS; |
| } |
| |
| bool os::can_execute_large_page_memory() { |
| return UseHugeTLBFS; |
| } |
| |
| // Reserve memory at an arbitrary address, only if that area is |
| // available (and not reserved for something else). |
| |
| char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| const int max_tries = 10; |
| char* base[max_tries]; |
| size_t size[max_tries]; |
| const size_t gap = 0x000000; |
| |
| // Assert only that the size is a multiple of the page size, since |
| // that's all that mmap requires, and since that's all we really know |
| // about at this low abstraction level. If we need higher alignment, |
| // we can either pass an alignment to this method or verify alignment |
| // in one of the methods further up the call chain. See bug 5044738. |
| assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); |
| |
| // Repeatedly allocate blocks until the block is allocated at the |
| // right spot. |
| |
| // Bsd mmap allows caller to pass an address as hint; give it a try first, |
| // if kernel honors the hint then we can return immediately. |
| char * addr = anon_mmap(requested_addr, bytes, false); |
| if (addr == requested_addr) { |
| return requested_addr; |
| } |
| |
| if (addr != NULL) { |
| // mmap() is successful but it fails to reserve at the requested address |
| anon_munmap(addr, bytes); |
| } |
| |
| int i; |
| for (i = 0; i < max_tries; ++i) { |
| base[i] = reserve_memory(bytes); |
| |
| if (base[i] != NULL) { |
| // Is this the block we wanted? |
| if (base[i] == requested_addr) { |
| size[i] = bytes; |
| break; |
| } |
| |
| // Does this overlap the block we wanted? Give back the overlapped |
| // parts and try again. |
| |
| size_t top_overlap = requested_addr + (bytes + gap) - base[i]; |
| if (top_overlap >= 0 && top_overlap < bytes) { |
| unmap_memory(base[i], top_overlap); |
| base[i] += top_overlap; |
| size[i] = bytes - top_overlap; |
| } else { |
| size_t bottom_overlap = base[i] + bytes - requested_addr; |
| if (bottom_overlap >= 0 && bottom_overlap < bytes) { |
| unmap_memory(requested_addr, bottom_overlap); |
| size[i] = bytes - bottom_overlap; |
| } else { |
| size[i] = bytes; |
| } |
| } |
| } |
| } |
| |
| // Give back the unused reserved pieces. |
| |
| for (int j = 0; j < i; ++j) { |
| if (base[j] != NULL) { |
| unmap_memory(base[j], size[j]); |
| } |
| } |
| |
| if (i < max_tries) { |
| return requested_addr; |
| } else { |
| return NULL; |
| } |
| } |
| |
| size_t os::read(int fd, void *buf, unsigned int nBytes) { |
| RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); |
| } |
| |
| size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { |
| RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset)); |
| } |
| |
| void os::naked_short_sleep(jlong ms) { |
| struct timespec req; |
| |
| assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
| req.tv_sec = 0; |
| if (ms > 0) { |
| req.tv_nsec = (ms % 1000) * 1000000; |
| } else { |
| req.tv_nsec = 1; |
| } |
| |
| nanosleep(&req, NULL); |
| |
| return; |
| } |
| |
| // Sleep forever; naked call to OS-specific sleep; use with CAUTION |
| void os::infinite_sleep() { |
| while (true) { // sleep forever ... |
| ::sleep(100); // ... 100 seconds at a time |
| } |
| } |
| |
| // Used to convert frequent JVM_Yield() to nops |
| bool os::dont_yield() { |
| return DontYieldALot; |
| } |
| |
| void os::naked_yield() { |
| sched_yield(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // thread priority support |
| |
| // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER |
| // only supports dynamic priority, static priority must be zero. For real-time |
| // applications, Bsd supports SCHED_RR which allows static priority (1-99). |
| // However, for large multi-threaded applications, SCHED_RR is not only slower |
| // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out |
| // of 5 runs - Sep 2005). |
| // |
| // The following code actually changes the niceness of kernel-thread/LWP. It |
| // has an assumption that setpriority() only modifies one kernel-thread/LWP, |
| // not the entire user process, and user level threads are 1:1 mapped to kernel |
| // threads. It has always been the case, but could change in the future. For |
| // this reason, the code should not be used as default (ThreadPriorityPolicy=0). |
| // It is only used when ThreadPriorityPolicy=1 and requires root privilege. |
| |
| #if !defined(__APPLE__) |
| int os::java_to_os_priority[CriticalPriority + 1] = { |
| 19, // 0 Entry should never be used |
| |
| 0, // 1 MinPriority |
| 3, // 2 |
| 6, // 3 |
| |
| 10, // 4 |
| 15, // 5 NormPriority |
| 18, // 6 |
| |
| 21, // 7 |
| 25, // 8 |
| 28, // 9 NearMaxPriority |
| |
| 31, // 10 MaxPriority |
| |
| 31 // 11 CriticalPriority |
| }; |
| #else |
| // Using Mach high-level priority assignments |
| int os::java_to_os_priority[CriticalPriority + 1] = { |
| 0, // 0 Entry should never be used (MINPRI_USER) |
| |
| 27, // 1 MinPriority |
| 28, // 2 |
| 29, // 3 |
| |
| 30, // 4 |
| 31, // 5 NormPriority (BASEPRI_DEFAULT) |
| 32, // 6 |
| |
| 33, // 7 |
| 34, // 8 |
| 35, // 9 NearMaxPriority |
| |
| 36, // 10 MaxPriority |
| |
| 36 // 11 CriticalPriority |
| }; |
| #endif |
| |
| static int prio_init() { |
| if (ThreadPriorityPolicy == 1) { |
| // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 |
| // if effective uid is not root. Perhaps, a more elegant way of doing |
| // this is to test CAP_SYS_NICE capability, but that will require libcap.so |
| if (geteuid() != 0) { |
| if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { |
| warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); |
| } |
| ThreadPriorityPolicy = 0; |
| } |
| } |
| if (UseCriticalJavaThreadPriority) { |
| os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
| } |
| return 0; |
| } |
| |
| OSReturn os::set_native_priority(Thread* thread, int newpri) { |
| if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; |
| |
| #ifdef __OpenBSD__ |
| // OpenBSD pthread_setprio starves low priority threads |
| return OS_OK; |
| #elif defined(__FreeBSD__) |
| int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); |
| #elif defined(__APPLE__) || defined(__NetBSD__) |
| struct sched_param sp; |
| int policy; |
| pthread_t self = pthread_self(); |
| |
| if (pthread_getschedparam(self, &policy, &sp) != 0) { |
| return OS_ERR; |
| } |
| |
| sp.sched_priority = newpri; |
| if (pthread_setschedparam(self, policy, &sp) != 0) { |
| return OS_ERR; |
| } |
| |
| return OS_OK; |
| #else |
| int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); |
| return (ret == 0) ? OS_OK : OS_ERR; |
| #endif |
| } |
| |
| OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { |
| if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { |
| *priority_ptr = java_to_os_priority[NormPriority]; |
| return OS_OK; |
| } |
| |
| errno = 0; |
| #if defined(__OpenBSD__) || defined(__FreeBSD__) |
| *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); |
| #elif defined(__APPLE__) || defined(__NetBSD__) |
| int policy; |
| struct sched_param sp; |
| |
| pthread_getschedparam(pthread_self(), &policy, &sp); |
| *priority_ptr = sp.sched_priority; |
| #else |
| *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); |
| #endif |
| return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); |
| } |
| |
| // Hint to the underlying OS that a task switch would not be good. |
| // Void return because it's a hint and can fail. |
| void os::hint_no_preempt() {} |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // suspend/resume support |
| |
| // The low-level signal-based suspend/resume support is a remnant from the |
| // old VM-suspension that used to be for java-suspension, safepoints etc, |
| // within hotspot. Currently used by JFR's OSThreadSampler |
| // |
| // The remaining code is greatly simplified from the more general suspension |
| // code that used to be used. |
| // |
| // The protocol is quite simple: |
| // - suspend: |
| // - sends a signal to the target thread |
| // - polls the suspend state of the osthread using a yield loop |
| // - target thread signal handler (SR_handler) sets suspend state |
| // and blocks in sigsuspend until continued |
| // - resume: |
| // - sets target osthread state to continue |
| // - sends signal to end the sigsuspend loop in the SR_handler |
| // |
| // Note that the SR_lock plays no role in this suspend/resume protocol, |
| // but is checked for NULL in SR_handler as a thread termination indicator. |
| // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. |
| // |
| // Note that resume_clear_context() and suspend_save_context() are needed |
| // by SR_handler(), so that fetch_frame_from_ucontext() works, |
| // which in part is used by: |
| // - Forte Analyzer: AsyncGetCallTrace() |
| // - StackBanging: get_frame_at_stack_banging_point() |
| |
| static void resume_clear_context(OSThread *osthread) { |
| osthread->set_ucontext(NULL); |
| osthread->set_siginfo(NULL); |
| } |
| |
| static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { |
| osthread->set_ucontext(context); |
| osthread->set_siginfo(siginfo); |
| } |
| |
| // Handler function invoked when a thread's execution is suspended or |
| // resumed. We have to be careful that only async-safe functions are |
| // called here (Note: most pthread functions are not async safe and |
| // should be avoided.) |
| // |
| // Note: sigwait() is a more natural fit than sigsuspend() from an |
| // interface point of view, but sigwait() prevents the signal hander |
| // from being run. libpthread would get very confused by not having |
| // its signal handlers run and prevents sigwait()'s use with the |
| // mutex granting granting signal. |
| // |
| // Currently only ever called on the VMThread or JavaThread |
| // |
| static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { |
| // Save and restore errno to avoid confusing native code with EINTR |
| // after sigsuspend. |
| int old_errno = errno; |
| |
| Thread* thread = Thread::current_or_null_safe(); |
| assert(thread != NULL, "Missing current thread in SR_handler"); |
| |
| // On some systems we have seen signal delivery get "stuck" until the signal |
| // mask is changed as part of thread termination. Check that the current thread |
| // has not already terminated (via SR_lock()) - else the following assertion |
| // will fail because the thread is no longer a JavaThread as the ~JavaThread |
| // destructor has completed. |
| |
| if (thread->SR_lock() == NULL) { |
| return; |
| } |
| |
| assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
| |
| OSThread* osthread = thread->osthread(); |
| |
| os::SuspendResume::State current = osthread->sr.state(); |
| if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { |
| suspend_save_context(osthread, siginfo, context); |
| |
| // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
| os::SuspendResume::State state = osthread->sr.suspended(); |
| if (state == os::SuspendResume::SR_SUSPENDED) { |
| sigset_t suspend_set; // signals for sigsuspend() |
| |
| // get current set of blocked signals and unblock resume signal |
| pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); |
| sigdelset(&suspend_set, SR_signum); |
| |
| sr_semaphore.signal(); |
| // wait here until we are resumed |
| while (1) { |
| sigsuspend(&suspend_set); |
| |
| os::SuspendResume::State result = osthread->sr.running(); |
| if (result == os::SuspendResume::SR_RUNNING) { |
| sr_semaphore.signal(); |
| break; |
| } else if (result != os::SuspendResume::SR_SUSPENDED) { |
| ShouldNotReachHere(); |
| } |
| } |
| |
| } else if (state == os::SuspendResume::SR_RUNNING) { |
| // request was cancelled, continue |
| } else { |
| ShouldNotReachHere(); |
| } |
| |
| resume_clear_context(osthread); |
| } else if (current == os::SuspendResume::SR_RUNNING) { |
| // request was cancelled, continue |
| } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { |
| // ignore |
| } else { |
| // ignore |
| } |
| |
| errno = old_errno; |
| } |
| |
| |
| static int SR_initialize() { |
| struct sigaction act; |
| char *s; |
| // Get signal number to use for suspend/resume |
| if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { |
| int sig = ::strtol(s, 0, 10); |
| if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. |
| sig < NSIG) { // Must be legal signal and fit into sigflags[]. |
| SR_signum = sig; |
| } else { |
| warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", |
| sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); |
| } |
| } |
| |
| assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, |
| "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); |
| |
| sigemptyset(&SR_sigset); |
| sigaddset(&SR_sigset, SR_signum); |
| |
| // Set up signal handler for suspend/resume |
| act.sa_flags = SA_RESTART|SA_SIGINFO; |
| act.sa_handler = (void (*)(int)) SR_handler; |
| |
| // SR_signum is blocked by default. |
| // 4528190 - We also need to block pthread restart signal (32 on all |
| // supported Bsd platforms). Note that BsdThreads need to block |
| // this signal for all threads to work properly. So we don't have |
| // to use hard-coded signal number when setting up the mask. |
| pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); |
| |
| if (sigaction(SR_signum, &act, 0) == -1) { |
| return -1; |
| } |
| |
| // Save signal flag |
| os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); |
| return 0; |
| } |
| |
| static int sr_notify(OSThread* osthread) { |
| int status = pthread_kill(osthread->pthread_id(), SR_signum); |
| assert_status(status == 0, status, "pthread_kill"); |
| return status; |
| } |
| |
| // "Randomly" selected value for how long we want to spin |
| // before bailing out on suspending a thread, also how often |
| // we send a signal to a thread we want to resume |
| static const int RANDOMLY_LARGE_INTEGER = 1000000; |
| static const int RANDOMLY_LARGE_INTEGER2 = 100; |
| |
| // returns true on success and false on error - really an error is fatal |
| // but this seems the normal response to library errors |
| static bool do_suspend(OSThread* osthread) { |
| assert(osthread->sr.is_running(), "thread should be running"); |
| assert(!sr_semaphore.trywait(), "semaphore has invalid state"); |
| |
| // mark as suspended and send signal |
| if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
| // failed to switch, state wasn't running? |
| ShouldNotReachHere(); |
| return false; |
| } |
| |
| if (sr_notify(osthread) != 0) { |
| ShouldNotReachHere(); |
| } |
| |
| // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED |
| while (true) { |
| if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { |
| break; |
| } else { |
| // timeout |
| os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); |
| if (cancelled == os::SuspendResume::SR_RUNNING) { |
| return false; |
| } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { |
| // make sure that we consume the signal on the semaphore as well |
| sr_semaphore.wait(); |
| break; |
| } else { |
| ShouldNotReachHere(); |
| return false; |
| } |
| } |
| } |
| |
| guarantee(osthread->sr.is_suspended(), "Must be suspended"); |
| return true; |
| } |
| |
| static void do_resume(OSThread* osthread) { |
| assert(osthread->sr.is_suspended(), "thread should be suspended"); |
| assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
| |
| if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { |
| // failed to switch to WAKEUP_REQUEST |
| ShouldNotReachHere(); |
| return; |
| } |
| |
| while (true) { |
| if (sr_notify(osthread) == 0) { |
| if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { |
| if (osthread->sr.is_running()) { |
| return; |
| } |
| } |
| } else { |
| ShouldNotReachHere(); |
| } |
| } |
| |
| guarantee(osthread->sr.is_running(), "Must be running!"); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////// |
| // signal handling (except suspend/resume) |
| |
| // This routine may be used by user applications as a "hook" to catch signals. |
| // The user-defined signal handler must pass unrecognized signals to this |
| // routine, and if it returns true (non-zero), then the signal handler must |
| // return immediately. If the flag "abort_if_unrecognized" is true, then this |
| // routine will never retun false (zero), but instead will execute a VM panic |
| // routine kill the process. |
| // |
| // If this routine returns false, it is OK to call it again. This allows |
| // the user-defined signal handler to perform checks either before or after |
| // the VM performs its own checks. Naturally, the user code would be making |
| // a serious error if it tried to handle an exception (such as a null check |
| // or breakpoint) that the VM was generating for its own correct operation. |
| // |
| // This routine may recognize any of the following kinds of signals: |
| // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. |
| // It should be consulted by handlers for any of those signals. |
| // |
| // The caller of this routine must pass in the three arguments supplied |
| // to the function referred to in the "sa_sigaction" (not the "sa_handler") |
| // field of the structure passed to sigaction(). This routine assumes that |
| // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. |
| // |
| // Note that the VM will print warnings if it detects conflicting signal |
| // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". |
| // |
| extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, |
| void* ucontext, |
| int abort_if_unrecognized); |
| |
| void signalHandler(int sig, siginfo_t* info, void* uc) { |
| assert(info != NULL && uc != NULL, "it must be old kernel"); |
| int orig_errno = errno; // Preserve errno value over signal handler. |
| JVM_handle_bsd_signal(sig, info, uc, true); |
| errno = orig_errno; |
| } |
| |
| |
| // This boolean allows users to forward their own non-matching signals |
| // to JVM_handle_bsd_signal, harmlessly. |
| bool os::Bsd::signal_handlers_are_installed = false; |
| |
| // For signal-chaining |
| struct sigaction sigact[NSIG]; |
| uint32_t sigs = 0; |
| #if (32 < NSIG-1) |
| #error "Not all signals can be encoded in sigs. Adapt its type!" |
| #endif |
| bool os::Bsd::libjsig_is_loaded = false; |
| typedef struct sigaction *(*get_signal_t)(int); |
| get_signal_t os::Bsd::get_signal_action = NULL; |
| |
| struct sigaction* os::Bsd::get_chained_signal_action(int sig) { |
| struct sigaction *actp = NULL; |
| |
| if (libjsig_is_loaded) { |
| // Retrieve the old signal handler from libjsig |
| actp = (*get_signal_action)(sig); |
| } |
| if (actp == NULL) { |
| // Retrieve the preinstalled signal handler from jvm |
| actp = get_preinstalled_handler(sig); |
| } |
| |
| return actp; |
| } |
| |
| static bool call_chained_handler(struct sigaction *actp, int sig, |
| siginfo_t *siginfo, void *context) { |
| // Call the old signal handler |
| if (actp->sa_handler == SIG_DFL) { |
| // It's more reasonable to let jvm treat it as an unexpected exception |
| // instead of taking the default action. |
| return false; |
| } else if (actp->sa_handler != SIG_IGN) { |
| if ((actp->sa_flags & SA_NODEFER) == 0) { |
| // automaticlly block the signal |
| sigaddset(&(actp->sa_mask), sig); |
| } |
| |
| sa_handler_t hand; |
| sa_sigaction_t sa; |
| bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; |
| // retrieve the chained handler |
| if (siginfo_flag_set) { |
| sa = actp->sa_sigaction; |
| } else { |
| hand = actp->sa_handler; |
| } |
| |
| if ((actp->sa_flags & SA_RESETHAND) != 0) { |
| actp->sa_handler = SIG_DFL; |
| } |
| |
| // try to honor the signal mask |
| sigset_t oset; |
| pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); |
| |
| // call into the chained handler |
| if (siginfo_flag_set) { |
| (*sa)(sig, siginfo, context); |
| } else { |
| (*hand)(sig); |
| } |
| |
| // restore the signal mask |
| pthread_sigmask(SIG_SETMASK, &oset, 0); |
| } |
| // Tell jvm's signal handler the signal is taken care of. |
| return true; |
| } |
| |
| bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { |
| bool chained = false; |
| // signal-chaining |
| if (UseSignalChaining) { |
| struct sigaction *actp = get_chained_signal_action(sig); |
| if (actp != NULL) { |
| chained = call_chained_handler(actp, sig, siginfo, context); |
| } |
| } |
| return chained; |
| } |
| |
| struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { |
| if ((((uint32_t)1 << (sig-1)) & sigs) != 0) { |
| return &sigact[sig]; |
| } |
| return NULL; |
| } |
| |
| void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { |
| assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); |
| sigact[sig] = oldAct; |
| sigs |= (uint32_t)1 << (sig-1); |
| } |
| |
| // for diagnostic |
| int sigflags[NSIG]; |
| |
| int os::Bsd::get_our_sigflags(int sig) { |
| assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); |
| return sigflags[sig]; |
| } |
| |
| void os::Bsd::set_our_sigflags(int sig, int flags) { |
| assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); |
| if (sig > 0 && sig < NSIG) { |
| sigflags[sig] = flags; |
| } |
| } |
| |
| void os::Bsd::set_signal_handler(int sig, bool set_installed) { |
| // Check for overwrite. |
| struct sigaction oldAct; |
| sigaction(sig, (struct sigaction*)NULL, &oldAct); |
| |
| void* oldhand = oldAct.sa_sigaction |
| ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) |
| : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); |
| if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && |
| oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && |
| oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { |
| if (AllowUserSignalHandlers || !set_installed) { |
| // Do not overwrite; user takes responsibility to forward to us. |
| return; |
| } else if (UseSignalChaining) { |
| // save the old handler in jvm |
| save_preinstalled_handler(sig, oldAct); |
| // libjsig also interposes the sigaction() call below and saves the |
| // old sigaction on it own. |
| } else { |
| fatal("Encountered unexpected pre-existing sigaction handler " |
| "%#lx for signal %d.", (long)oldhand, sig); |
| } |
| } |
| |
| struct sigaction sigAct; |
| sigfillset(&(sigAct.sa_mask)); |
| sigAct.sa_handler = SIG_DFL; |
| if (!set_installed) { |
| sigAct.sa_flags = SA_SIGINFO|SA_RESTART; |
| } else { |
| sigAct.sa_sigaction = signalHandler; |
| sigAct.sa_flags = SA_SIGINFO|SA_RESTART; |
| } |
| #ifdef __APPLE__ |
| // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
| // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
| // if the signal handler declares it will handle it on alternate stack. |
| // Notice we only declare we will handle it on alt stack, but we are not |
| // actually going to use real alt stack - this is just a workaround. |
| // Please see ux_exception.c, method catch_mach_exception_raise for details |
| // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
| if (sig == SIGSEGV) { |
| sigAct.sa_flags |= SA_ONSTACK; |
| } |
| #endif |
| |
| // Save flags, which are set by ours |
| assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); |
| sigflags[sig] = sigAct.sa_flags; |
| |
| int ret = sigaction(sig, &sigAct, &oldAct); |
| assert(ret == 0, "check"); |
| |
| void* oldhand2 = oldAct.sa_sigaction |
| ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) |
| : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); |
| assert(oldhand2 == oldhand, "no concurrent signal handler installation"); |
| } |
| |
| // install signal handlers for signals that HotSpot needs to |
| // handle in order to support Java-level exception handling. |
| |
| void os::Bsd::install_signal_handlers() { |
| if (!signal_handlers_are_installed) { |
| signal_handlers_are_installed = true; |
| |
| // signal-chaining |
| typedef void (*signal_setting_t)(); |
| signal_setting_t begin_signal_setting = NULL; |
| signal_setting_t end_signal_setting = NULL; |
| begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, |
| dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); |
| if (begin_signal_setting != NULL) { |
| end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, |
| dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); |
| get_signal_action = CAST_TO_FN_PTR(get_signal_t, |
| dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); |
| libjsig_is_loaded = true; |
| assert(UseSignalChaining, "should enable signal-chaining"); |
| } |
| if (libjsig_is_loaded) { |
| // Tell libjsig jvm is setting signal handlers |
| (*begin_signal_setting)(); |
| } |
| |
| set_signal_handler(SIGSEGV, true); |
| set_signal_handler(SIGPIPE, true); |
| set_signal_handler(SIGBUS, true); |
| set_signal_handler(SIGILL, true); |
| set_signal_handler(SIGFPE, true); |
| set_signal_handler(SIGXFSZ, true); |
| |
| #if defined(__APPLE__) |
| // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including |
| // signals caught and handled by the JVM. To work around this, we reset the mach task |
| // signal handler that's placed on our process by CrashReporter. This disables |
| // CrashReporter-based reporting. |
| // |
| // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes |
| // on caught fatal signals. |
| // |
| // Additionally, gdb installs both standard BSD signal handlers, and mach exception |
| // handlers. By replacing the existing task exception handler, we disable gdb's mach |
| // exception handling, while leaving the standard BSD signal handlers functional. |
| kern_return_t kr; |
| kr = task_set_exception_ports(mach_task_self(), |
| EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, |
| MACH_PORT_NULL, |
| EXCEPTION_STATE_IDENTITY, |
| MACHINE_THREAD_STATE); |
| |
| assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); |
| #endif |
| |
| if (libjsig_is_loaded) { |
| // Tell libjsig jvm finishes setting signal handlers |
| (*end_signal_setting)(); |
| } |
| |
| // We don't activate signal checker if libjsig is in place, we trust ourselves |
| // and if UserSignalHandler is installed all bets are off |
| if (CheckJNICalls) { |
| if (libjsig_is_loaded) { |
| if (PrintJNIResolving) { |
| tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
| } |
| check_signals = false; |
| } |
| if (AllowUserSignalHandlers) { |
| if (PrintJNIResolving) { |
| tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
| } |
| check_signals = false; |
| } |
| } |
| } |
| } |
| |
| |
| ///// |
| // glibc on Bsd platform uses non-documented flag |
| // to indicate, that some special sort of signal |
| // trampoline is used. |
| // We will never set this flag, and we should |
| // ignore this flag in our diagnostic |
| #ifdef SIGNIFICANT_SIGNAL_MASK |
| #undef SIGNIFICANT_SIGNAL_MASK |
| #endif |
| #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) |
| |
| static const char* get_signal_handler_name(address handler, |
| char* buf, int buflen) { |
| int offset; |
| bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); |
| if (found) { |
| // skip directory names |
| const char *p1, *p2; |
| p1 = buf; |
| size_t len = strlen(os::file_separator()); |
| while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; |
| jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); |
| } else { |
| jio_snprintf(buf, buflen, PTR_FORMAT, handler); |
| } |
| return buf; |
| } |
| |
| static void print_signal_handler(outputStream* st, int sig, |
| char* buf, size_t buflen) { |
| struct sigaction sa; |
| |
| sigaction(sig, NULL, &sa); |
| |
| // See comment for SIGNIFICANT_SIGNAL_MASK define |
| sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; |
| |
| st->print("%s: ", os::exception_name(sig, buf, buflen)); |
| |
| address handler = (sa.sa_flags & SA_SIGINFO) |
| ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) |
| : CAST_FROM_FN_PTR(address, sa.sa_handler); |
| |
| if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { |
| st->print("SIG_DFL"); |
| } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { |
| st->print("SIG_IGN"); |
| } else { |
| st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); |
| } |
| |
| st->print(", sa_mask[0]="); |
| os::Posix::print_signal_set_short(st, &sa.sa_mask); |
| |
| address rh = VMError::get_resetted_sighandler(sig); |
| // May be, handler was resetted by VMError? |
| if (rh != NULL) { |
| handler = rh; |
| sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; |
| } |
| |
| st->print(", sa_flags="); |
| os::Posix::print_sa_flags(st, sa.sa_flags); |
| |
| // Check: is it our handler? |
| if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || |
| handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { |
| // It is our signal handler |
| // check for flags, reset system-used one! |
| if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { |
| st->print( |
| ", flags was changed from " PTR32_FORMAT ", consider using jsig library", |
| os::Bsd::get_our_sigflags(sig)); |
| } |
| } |
| st->cr(); |
| } |
| |
| |
| #define DO_SIGNAL_CHECK(sig) \ |
| do { \ |
| if (!sigismember(&check_signal_done, sig)) { \ |
| os::Bsd::check_signal_handler(sig); \ |
| } \ |
| } while (0) |
| |
| // This method is a periodic task to check for misbehaving JNI applications |
| // under CheckJNI, we can add any periodic checks here |
| |
| void os::run_periodic_checks() { |
| |
| if (check_signals == false) return; |
| |
| // SEGV and BUS if overridden could potentially prevent |
| // generation of hs*.log in the event of a crash, debugging |
| // such a case can be very challenging, so we absolutely |
| // check the following for a good measure: |
| DO_SIGNAL_CHECK(SIGSEGV); |
| DO_SIGNAL_CHECK(SIGILL); |
| DO_SIGNAL_CHECK(SIGFPE); |
| DO_SIGNAL_CHECK(SIGBUS); |
| DO_SIGNAL_CHECK(SIGPIPE); |
| DO_SIGNAL_CHECK(SIGXFSZ); |
| |
| |
| // ReduceSignalUsage allows the user to override these handlers |
| // see comments at the very top and jvm_solaris.h |
| if (!ReduceSignalUsage) { |
| DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); |
| DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); |
| DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); |
| DO_SIGNAL_CHECK(BREAK_SIGNAL); |
| } |
| |
| DO_SIGNAL_CHECK(SR_signum); |
| } |
| |
| typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); |
| |
| static os_sigaction_t os_sigaction = NULL; |
| |
| void os::Bsd::check_signal_handler(int sig) { |
| char buf[O_BUFLEN]; |
| address jvmHandler = NULL; |
| |
| |
| struct sigaction act; |
| if (os_sigaction == NULL) { |
| // only trust the default sigaction, in case it has been interposed |
| os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); |
| if (os_sigaction == NULL) return; |
| } |
| |
| os_sigaction(sig, (struct sigaction*)NULL, &act); |
| |
| |
| act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; |
| |
| address thisHandler = (act.sa_flags & SA_SIGINFO) |
| ? CAST_FROM_FN_PTR(address, act.sa_sigaction) |
| : CAST_FROM_FN_PTR(address, act.sa_handler); |
| |
| |
| switch (sig) { |
| case SIGSEGV: |
| case SIGBUS: |
| case SIGFPE: |
| case SIGPIPE: |
| case SIGILL: |
| case SIGXFSZ: |
| jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); |
| break; |
| |
| case SHUTDOWN1_SIGNAL: |
| case SHUTDOWN2_SIGNAL: |
| case SHUTDOWN3_SIGNAL: |
| case BREAK_SIGNAL: |
| jvmHandler = (address)user_handler(); |
| break; |
| |
| default: |
| if (sig == SR_signum) { |
| jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); |
| } else { |
| return; |
| } |
| break; |
| } |
| |
| if (thisHandler != jvmHandler) { |
| tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); |
| tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); |
| tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); |
| // No need to check this sig any longer |
| sigaddset(&check_signal_done, sig); |
| // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN |
| if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { |
| tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", |
| exception_name(sig, buf, O_BUFLEN)); |
| } |
| } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { |
| tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); |
| tty->print("expected:"); |
| os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig)); |
| tty->cr(); |
| tty->print(" found:"); |
| os::Posix::print_sa_flags(tty, act.sa_flags); |
| tty->cr(); |
| // No need to check this sig any longer |
| sigaddset(&check_signal_done, sig); |
| } |
| |
| // Dump all the signal |
| if (sigismember(&check_signal_done, sig)) { |
| print_signal_handlers(tty, buf, O_BUFLEN); |
| } |
| } |
| |
| extern void report_error(char* file_name, int line_no, char* title, |
| char* format, ...); |
| |
| // this is called _before_ the most of global arguments have been parsed |
| void os::init(void) { |
| char dummy; // used to get a guess on initial stack address |
| |
| // With BsdThreads the JavaMain thread pid (primordial thread) |
| // is different than the pid of the java launcher thread. |
| // So, on Bsd, the launcher thread pid is passed to the VM |
| // via the sun.java.launcher.pid property. |
| // Use this property instead of getpid() if it was correctly passed. |
| // See bug 6351349. |
| pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); |
| |
| _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); |
| |
| clock_tics_per_sec = CLK_TCK; |
| |
| init_random(1234567); |
| |
| ThreadCritical::initialize(); |
| |
| Bsd::set_page_size(getpagesize()); |
| if (Bsd::page_size() == -1) { |
| fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); |
| } |
| init_page_sizes((size_t) Bsd::page_size()); |
| |
| Bsd::initialize_system_info(); |
| |
| // main_thread points to the aboriginal thread |
| Bsd::_main_thread = pthread_self(); |
| |
| Bsd::clock_init(); |
| initial_time_count = javaTimeNanos(); |
| |
| #ifdef __APPLE__ |
| // XXXDARWIN |
| // Work around the unaligned VM callbacks in hotspot's |
| // sharedRuntime. The callbacks don't use SSE2 instructions, and work on |
| // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces |
| // alignment when doing symbol lookup. To work around this, we force early |
| // binding of all symbols now, thus binding when alignment is known-good. |
| _dyld_bind_fully_image_containing_address((const void *) &os::init); |
| #endif |
| |
| os::Posix::init(); |
| } |
| |
| // To install functions for atexit system call |
| extern "C" { |
| static void perfMemory_exit_helper() { |
| perfMemory_exit(); |
| } |
| } |
| |
| // this is called _after_ the global arguments have been parsed |
| jint os::init_2(void) { |
| |
| os::Posix::init_2(); |
| |
| // Allocate a single page and mark it as readable for safepoint polling |
| address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
| guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page"); |
| |
| os::set_polling_page(polling_page); |
| log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); |
| |
| if (!UseMembar) { |
| address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
| guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
| os::set_memory_serialize_page(mem_serialize_page); |
| log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); |
| } |
| |
| // initialize suspend/resume support - must do this before signal_sets_init() |
| if (SR_initialize() != 0) { |
| perror("SR_initialize failed"); |
| return JNI_ERR; |
| } |
| |
| Bsd::signal_sets_init(); |
| Bsd::install_signal_handlers(); |
| |
| // Check and sets minimum stack sizes against command line options |
| if (Posix::set_minimum_stack_sizes() == JNI_ERR) { |
| return JNI_ERR; |
| } |
| |
| if (MaxFDLimit) { |
| // set the number of file descriptors to max. print out error |
| // if getrlimit/setrlimit fails but continue regardless. |
| struct rlimit nbr_files; |
| int status = getrlimit(RLIMIT_NOFILE, &nbr_files); |
| if (status != 0) { |
| log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); |
| } else { |
| nbr_files.rlim_cur = nbr_files.rlim_max; |
| |
| #ifdef __APPLE__ |
| // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if |
| // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must |
| // be used instead |
| nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); |
| #endif |
| |
| status = setrlimit(RLIMIT_NOFILE, &nbr_files); |
| if (status != 0) { |
| log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); |
| } |
| } |
| } |
| |
| // at-exit methods are called in the reverse order of their registration. |
| // atexit functions are called on return from main or as a result of a |
| // call to exit(3C). There can be only 32 of these functions registered |
| // and atexit() does not set errno. |
| |
| if (PerfAllowAtExitRegistration) { |
| // only register atexit functions if PerfAllowAtExitRegistration is set. |
| // atexit functions can be delayed until process exit time, which |
| // can be problematic for embedded VM situations. Embedded VMs should |
| // call DestroyJavaVM() to assure that VM resources are released. |
| |
| // note: perfMemory_exit_helper atexit function may be removed in |
| // the future if the appropriate cleanup code can be added to the |
| // VM_Exit VMOperation's doit method. |
| if (atexit(perfMemory_exit_helper) != 0) { |
| warning("os::init_2 atexit(perfMemory_exit_helper) failed"); |
| } |
| } |
| |
| // initialize thread priority policy |
| prio_init(); |
| |
| #ifdef __APPLE__ |
| // dynamically link to objective c gc registration |
| void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); |
| if (handleLibObjc != NULL) { |
| objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); |
| } |
| #endif |
| |
| return JNI_OK; |
| } |
| |
| // Mark the polling page as unreadable |
| void os::make_polling_page_unreadable(void) { |
| if (!guard_memory((char*)_polling_page, Bsd::page_size())) { |
| fatal("Could not disable polling page"); |
| } |
| } |
| |
| // Mark the polling page as readable |
| void os::make_polling_page_readable(void) { |
| if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { |
| fatal("Could not enable polling page"); |
| } |
| } |
| |
| int os::active_processor_count() { |
| return _processor_count; |
| } |
| |
| void os::set_native_thread_name(const char *name) { |
| #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 |
| // This is only supported in Snow Leopard and beyond |
| if (name != NULL) { |
| // Add a "Java: " prefix to the name |
| char buf[MAXTHREADNAMESIZE]; |
| snprintf(buf, sizeof(buf), "Java: %s", name); |
| pthread_setname_np(buf); |
| } |
| #endif |
| } |
| |
| bool os::distribute_processes(uint length, uint* distribution) { |
| // Not yet implemented. |
| return false; |
| } |
| |
| bool os::bind_to_processor(uint processor_id) { |
| // Not yet implemented. |
| return false; |
| } |
| |
| void os::SuspendedThreadTask::internal_do_task() { |
| if (do_suspend(_thread->osthread())) { |
| SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); |
| do_task(context); |
| do_resume(_thread->osthread()); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // debug support |
| |
| bool os::find(address addr, outputStream* st) { |
| Dl_info dlinfo; |
| memset(&dlinfo, 0, sizeof(dlinfo)); |
| if (dladdr(addr, &dlinfo) != 0) { |
| st->print(INTPTR_FORMAT ": ", (intptr_t)addr); |
| if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
| st->print("%s+%#x", dlinfo.dli_sname, |
| (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr)); |
| } else if (dlinfo.dli_fbase != NULL) { |
| st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase)); |
| } else { |
| st->print("<absolute address>"); |
| } |
| if (dlinfo.dli_fname != NULL) { |
| st->print(" in %s", dlinfo.dli_fname); |
| } |
| if (dlinfo.dli_fbase != NULL) { |
| st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase); |
| } |
| st->cr(); |
| |
| if (Verbose) { |
| // decode some bytes around the PC |
| address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
| address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
| address lowest = (address) dlinfo.dli_sname; |
| if (!lowest) lowest = (address) dlinfo.dli_fbase; |
| if (begin < lowest) begin = lowest; |
| Dl_info dlinfo2; |
| if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
| && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { |
| end = (address) dlinfo2.dli_saddr; |
| } |
| Disassembler::decode(begin, end, st); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // misc |
| |
| // This does not do anything on Bsd. This is basically a hook for being |
| // able to use structured exception handling (thread-local exception filters) |
| // on, e.g., Win32. |
| void os::os_exception_wrapper(java_call_t f, JavaValue* value, |
| const methodHandle& method, JavaCallArguments* args, |
| Thread* thread) { |
| f(value, method, args, thread); |
| } |
| |
| void os::print_statistics() { |
| } |
| |
| bool os::message_box(const char* title, const char* message) { |
| int i; |
| fdStream err(defaultStream::error_fd()); |
| for (i = 0; i < 78; i++) err.print_raw("="); |
| err.cr(); |
| err.print_raw_cr(title); |
| for (i = 0; i < 78; i++) err.print_raw("-"); |
| err.cr(); |
| err.print_raw_cr(message); |
| for (i = 0; i < 78; i++) err.print_raw("="); |
| err.cr(); |
| |
| char buf[16]; |
| // Prevent process from exiting upon "read error" without consuming all CPU |
| while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } |
| |
| return buf[0] == 'y' || buf[0] == 'Y'; |
| } |
| |
| int os::stat(const char *path, struct stat *sbuf) { |
| char pathbuf[MAX_PATH]; |
| if (strlen(path) > MAX_PATH - 1) { |
| errno = ENAMETOOLONG; |
| return -1; |
| } |
| os::native_path(strcpy(pathbuf, path)); |
| return ::stat(pathbuf, sbuf); |
| } |
| |
| static inline struct timespec get_mtime(const char* filename) { |
| struct stat st; |
| int ret = os::stat(filename, &st); |
| assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); |
| #ifdef __APPLE__ |
| return st.st_mtimespec; |
| #else |
| return st.st_mtim; |
| #endif |
| } |
| |
| int os::compare_file_modified_times(const char* file1, const char* file2) { |
| struct timespec filetime1 = get_mtime(file1); |
| struct timespec filetime2 = get_mtime(file2); |
| int diff = filetime1.tv_sec - filetime2.tv_sec; |
| if (diff == 0) { |
| return filetime1.tv_nsec - filetime2.tv_nsec; |
| } |
| return diff; |
| } |
| |
| // Is a (classpath) directory empty? |
| bool os::dir_is_empty(const char* path) { |
| DIR *dir = NULL; |
| struct dirent *ptr; |
| |
| dir = opendir(path); |
| if (dir == NULL) return true; |
| |
| // Scan the directory |
| bool result = true; |
| char buf[sizeof(struct dirent) + MAX_PATH]; |
| while (result && (ptr = ::readdir(dir)) != NULL) { |
| if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { |
| result = false; |
| } |
| } |
| closedir(dir); |
| return result; |
| } |
| |
| // This code originates from JDK's sysOpen and open64_w |
| // from src/solaris/hpi/src/system_md.c |
| |
| int os::open(const char *path, int oflag, int mode) { |
| if (strlen(path) > MAX_PATH - 1) { |
| errno = ENAMETOOLONG; |
| return -1; |
| } |
| int fd; |
| |
| fd = ::open(path, oflag, mode); |
| if (fd == -1) return -1; |
| |
| // If the open succeeded, the file might still be a directory |
| { |
| struct stat buf; |
| int ret = ::fstat(fd, &buf); |
| int st_mode = buf.st_mode; |
| |
| if (ret != -1) { |
| if ((st_mode & S_IFMT) == S_IFDIR) { |
| errno = EISDIR; |
| ::close(fd); |
| return -1; |
| } |
| } else { |
| ::close(fd); |
| return -1; |
| } |
| } |
| |
| // All file descriptors that are opened in the JVM and not |
| // specifically destined for a subprocess should have the |
| // close-on-exec flag set. If we don't set it, then careless 3rd |
| // party native code might fork and exec without closing all |
| // appropriate file descriptors (e.g. as we do in closeDescriptors in |
| // UNIXProcess.c), and this in turn might: |
| // |
| // - cause end-of-file to fail to be detected on some file |
| // descriptors, resulting in mysterious hangs, or |
| // |
| // - might cause an fopen in the subprocess to fail on a system |
| // suffering from bug 1085341. |
| // |
| // (Yes, the default setting of the close-on-exec flag is a Unix |
| // design flaw) |
| // |
| // See: |
| // 1085341: 32-bit stdio routines should support file descriptors >255 |
| // 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
| // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 |
| // |
| #ifdef FD_CLOEXEC |
| { |
| int flags = ::fcntl(fd, F_GETFD); |
| if (flags != -1) { |
| ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
| } |
| } |
| #endif |
| |
| return fd; |
| } |
| |
| |
| // create binary file, rewriting existing file if required |
| int os::create_binary_file(const char* path, bool rewrite_existing) { |
| int oflags = O_WRONLY | O_CREAT; |
| if (!rewrite_existing) { |
| oflags |= O_EXCL; |
| } |
| return ::open(path, oflags, S_IREAD | S_IWRITE); |
| } |
| |
| // return current position of file pointer |
| jlong os::current_file_offset(int fd) { |
| return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); |
| } |
| |
| // move file pointer to the specified offset |
| jlong os::seek_to_file_offset(int fd, jlong offset) { |
| return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); |
| } |
| |
| // This code originates from JDK's sysAvailable |
| // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
| |
| int os::available(int fd, jlong *bytes) { |
| jlong cur, end; |
| int mode; |
| struct stat buf; |
| |
| if (::fstat(fd, &buf) >= 0) { |
| mode = buf.st_mode; |
| if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
| int n; |
| if (::ioctl(fd, FIONREAD, &n) >= 0) { |
| *bytes = n; |
| return 1; |
| } |
| } |
| } |
| if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { |
| return 0; |
| } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { |
| return 0; |
| } else if (::lseek(fd, cur, SEEK_SET) == -1) { |
| return 0; |
| } |
| *bytes = end - cur; |
| return 1; |
| } |
| |
| // Map a block of memory. |
| char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| char *addr, size_t bytes, bool read_only, |
| bool allow_exec) { |
| int prot; |
| int flags; |
| |
| if (read_only) { |
| prot = PROT_READ; |
| flags = MAP_SHARED; |
| } else { |
| prot = PROT_READ | PROT_WRITE; |
| flags = MAP_PRIVATE; |
| } |
| |
| if (allow_exec) { |
| prot |= PROT_EXEC; |
| } |
| |
| if (addr != NULL) { |
| flags |= MAP_FIXED; |
| } |
| |
| char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, |
| fd, file_offset); |
| if (mapped_address == MAP_FAILED) { |
| return NULL; |
| } |
| return mapped_address; |
| } |
| |
| |
| // Remap a block of memory. |
| char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| char *addr, size_t bytes, bool read_only, |
| bool allow_exec) { |
| // same as map_memory() on this OS |
| return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, |
| allow_exec); |
| } |
| |
| |
| // Unmap a block of memory. |
| bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| return munmap(addr, bytes) == 0; |
| } |
| |
| // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) |
| // are used by JVM M&M and JVMTI to get user+sys or user CPU time |
| // of a thread. |
| // |
| // current_thread_cpu_time() and thread_cpu_time(Thread*) returns |
| // the fast estimate available on the platform. |
| |
| jlong os::current_thread_cpu_time() { |
| #ifdef __APPLE__ |
| return os::thread_cpu_time(Thread::current(), true /* user + sys */); |
| #else |
| Unimplemented(); |
| return 0; |
| #endif |
| } |
| |
| jlong os::thread_cpu_time(Thread* thread) { |
| #ifdef __APPLE__ |
| return os::thread_cpu_time(thread, true /* user + sys */); |
| #else |
| Unimplemented(); |
| return 0; |
| #endif |
| } |
| |
| jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { |
| #ifdef __APPLE__ |
| return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); |
| #else |
| Unimplemented(); |
| return 0; |
| #endif |
| } |
| |
| jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { |
| #ifdef __APPLE__ |
| struct thread_basic_info tinfo; |
| mach_msg_type_number_t tcount = THREAD_INFO_MAX; |
| kern_return_t kr; |
| thread_t mach_thread; |
| |
| mach_thread = thread->osthread()->thread_id(); |
| kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
| if (kr != KERN_SUCCESS) { |
| return -1; |
| } |
| |
| if (user_sys_cpu_time) { |
| jlong nanos; |
| nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; |
| nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; |
| return nanos; |
| } else { |
| return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); |
| } |
| #else |
| Unimplemented(); |
| return 0; |
| #endif |
| } |
| |
| |
| void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { |
| info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits |
| info_ptr->may_skip_backward = false; // elapsed time not wall time |
| info_ptr->may_skip_forward = false; // elapsed time not wall time |
| info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned |
| } |
| |
| void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { |
| info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits |
| info_ptr->may_skip_backward = false; // elapsed time not wall time |
| info_ptr->may_skip_forward = false; // elapsed time not wall time |
| info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned |
| } |
| |
| bool os::is_thread_cpu_time_supported() { |
| #ifdef __APPLE__ |
| return true; |
| #else |
| return false; |
| #endif |
| } |
| |
| // System loadavg support. Returns -1 if load average cannot be obtained. |
| // Bsd doesn't yet have a (official) notion of processor sets, |
| // so just return the system wide load average. |
| int os::loadavg(double loadavg[], int nelem) { |
| return ::getloadavg(loadavg, nelem); |
| } |
| |
| void os::pause() { |
| char filename[MAX_PATH]; |
| if (PauseAtStartupFile && PauseAtStartupFile[0]) { |
| jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); |
| } else { |
| jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); |
| } |
| |
| int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
| if (fd != -1) { |
| struct stat buf; |
| ::close(fd); |
| while (::stat(filename, &buf) == 0) { |
| (void)::poll(NULL, 0, 100); |
| } |
| } else { |
| jio_fprintf(stderr, |
| "Could not open pause file '%s', continuing immediately.\n", filename); |
| } |
| } |
| |
| // Darwin has no "environ" in a dynamic library. |
| #ifdef __APPLE__ |
| #include <crt_externs.h> |
| #define environ (*_NSGetEnviron()) |
| #else |
| extern char** environ; |
| #endif |
| |
| // Run the specified command in a separate process. Return its exit value, |
| // or -1 on failure (e.g. can't fork a new process). |
| // Unlike system(), this function can be called from signal handler. It |
| // doesn't block SIGINT et al. |
| int os::fork_and_exec(char* cmd) { |
| const char * argv[4] = {"sh", "-c", cmd, NULL}; |
| |
| // fork() in BsdThreads/NPTL is not async-safe. It needs to run |
| // pthread_atfork handlers and reset pthread library. All we need is a |
| // separate process to execve. Make a direct syscall to fork process. |
| // On IA64 there's no fork syscall, we have to use fork() and hope for |
| // the best... |
| pid_t pid = fork(); |
| |
| if (pid < 0) { |
| // fork failed |
| return -1; |
| |
| } else if (pid == 0) { |
| // child process |
| |
| // execve() in BsdThreads will call pthread_kill_other_threads_np() |
| // first to kill every thread on the thread list. Because this list is |
| // not reset by fork() (see notes above), execve() will instead kill |
| // every thread in the parent process. We know this is the only thread |
| // in the new process, so make a system call directly. |
| // IA64 should use normal execve() from glibc to match the glibc fork() |
| // above. |
| execve("/bin/sh", (char* const*)argv, environ); |
| |
| // execve failed |
| _exit(-1); |
| |
| } else { |
| // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't |
| // care about the actual exit code, for now. |
| |
| int status; |
| |
| // Wait for the child process to exit. This returns immediately if |
| // the child has already exited. */ |
| while (waitpid(pid, &status, 0) < 0) { |
| switch (errno) { |
| case ECHILD: return 0; |
| case EINTR: break; |
| default: return -1; |
| } |
| } |
| |
| if (WIFEXITED(status)) { |
| // The child exited normally; get its exit code. |
| return WEXITSTATUS(status); |
| } else if (WIFSIGNALED(status)) { |
| // The child exited because of a signal |
| // The best value to return is 0x80 + signal number, |
| // because that is what all Unix shells do, and because |
| // it allows callers to distinguish between process exit and |
| // process death by signal. |
| return 0x80 + WTERMSIG(status); |
| } else { |
| // Unknown exit code; pass it through |
| return status; |
| } |
| } |
| } |
| |
| // is_headless_jre() |
| // |
| // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| // in order to report if we are running in a headless jre |
| // |
| // Since JDK8 xawt/libmawt.so was moved into the same directory |
| // as libawt.so, and renamed libawt_xawt.so |
| // |
| bool os::is_headless_jre() { |
| #ifdef __APPLE__ |
| // We no longer build headless-only on Mac OS X |
| return false; |
| #else |
| struct stat statbuf; |
| char buf[MAXPATHLEN]; |
| char libmawtpath[MAXPATHLEN]; |
| const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
| const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
| char *p; |
| |
| // Get path to libjvm.so |
| os::jvm_path(buf, sizeof(buf)); |
| |
| // Get rid of libjvm.so |
| p = strrchr(buf, '/'); |
| if (p == NULL) { |
| return false; |
| } else { |
| *p = '\0'; |
| } |
| |
| // Get rid of client or server |
| p = strrchr(buf, '/'); |
| if (p == NULL) { |
| return false; |
| } else { |
| *p = '\0'; |
| } |
| |
| // check xawt/libmawt.so |
| strcpy(libmawtpath, buf); |
| strcat(libmawtpath, xawtstr); |
| if (::stat(libmawtpath, &statbuf) == 0) return false; |
| |
| // check libawt_xawt.so |
| strcpy(libmawtpath, buf); |
| strcat(libmawtpath, new_xawtstr); |
| if (::stat(libmawtpath, &statbuf) == 0) return false; |
| |
| return true; |
| #endif |
| } |
| |
| // Get the default path to the core file |
| // Returns the length of the string |
| int os::get_core_path(char* buffer, size_t bufferSize) { |
| int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id()); |
| |
| // Truncate if theoretical string was longer than bufferSize |
| n = MIN2(n, (int)bufferSize); |
| |
| return n; |
| } |
| |
| #ifndef PRODUCT |
| void TestReserveMemorySpecial_test() { |
| // No tests available for this platform |
| } |
| #endif |
| |
| bool os::start_debugging(char *buf, int buflen) { |
| int len = (int)strlen(buf); |
| char *p = &buf[len]; |
| |
| jio_snprintf(p, buflen-len, |
| "\n\n" |
| "Do you want to debug the problem?\n\n" |
| "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" |
| "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" |
| "Otherwise, press RETURN to abort...", |
| os::current_process_id(), os::current_process_id(), |
| os::current_thread_id(), os::current_thread_id()); |
| |
| bool yes = os::message_box("Unexpected Error", buf); |
| |
| if (yes) { |
| // yes, user asked VM to launch debugger |
| jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d", |
| os::current_process_id(), os::current_process_id()); |
| |
| os::fork_and_exec(buf); |
| yes = false; |
| } |
| return yes; |
| } |