--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/bsd/os_bsd.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,4098 @@
+/*
+ * 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;
+}