/*
* Copyright (c) 1999, 2022, 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/vmSymbols.hpp"
#include "code/icBuffer.hpp"
#include "code/vtableStubs.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/disassembler.hpp"
#include "interpreter/interpreter.hpp"
#include "jvm.h"
#include "jvmtifiles/jvmti.h"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allocation.inline.hpp"
#include "oops/oop.inline.hpp"
#include "os_bsd.inline.hpp"
#include "os_posix.inline.hpp"
#include "prims/jniFastGetField.hpp"
#include "prims/jvm_misc.hpp"
#include "runtime/arguments.hpp"
#include "runtime/atomic.hpp"
#include "runtime/globals.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/objectMonitor.hpp"
#include "runtime/osInfo.hpp"
#include "runtime/osThread.hpp"
#include "runtime/perfMemory.hpp"
#include "runtime/semaphore.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/statSampler.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/threadCritical.hpp"
#include "runtime/threads.hpp"
#include "runtime/timer.hpp"
#include "services/attachListener.hpp"
#include "services/memTracker.hpp"
#include "services/runtimeService.hpp"
#include "signals_posix.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 <dlfcn.h>
# include <errno.h>
# include <fcntl.h>
# include <inttypes.h>
# include <poll.h>
# include <pthread.h>
# include <pwd.h>
# include <signal.h>
# include <stdint.h>
# include <stdio.h>
# include <string.h>
# include <sys/ioctl.h>
# include <sys/mman.h>
# include <sys/param.h>
# include <sys/resource.h>
# include <sys/socket.h>
# include <sys/stat.h>
# include <sys/syscall.h>
# include <sys/sysctl.h>
# include <sys/time.h>
# include <sys/times.h>
# include <sys/types.h>
# include <time.h>
# include <unistd.h>
#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <elf.h>
#endif
#ifdef __APPLE__
#include <mach-o/dyld.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)
////////////////////////////////////////////////////////////////////////////////
// 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;
#endif
pthread_t os::Bsd::_main_thread;
#if defined(__APPLE__) && defined(__x86_64__)
static const int processor_id_unassigned = -1;
static const int processor_id_assigning = -2;
static const int processor_id_map_size = 256;
static volatile int processor_id_map[processor_id_map_size];
static volatile int processor_id_next = 0;
#endif
////////////////////////////////////////////////////////////////////////////////
// utility functions
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;
}
// for more info see :
// https://man.openbsd.org/sysctl.2
void os::Bsd::print_uptime_info(outputStream* st) {
struct timeval boottime;
size_t len = sizeof(boottime);
int mib[2];
mib[0] = CTL_KERN;
mib[1] = KERN_BOOTTIME;
if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
time_t bootsec = boottime.tv_sec;
time_t currsec = time(NULL);
os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
}
}
julong os::physical_memory() {
return Bsd::physical_memory();
}
// 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(AARCH64)
static char cpu_arch[] = "aarch64";
#elif defined(PPC32)
static char cpu_arch[] = "ppc";
#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
}
#if defined(__APPLE__) && defined(__x86_64__)
// initialize processor id map
for (int i = 0; i < processor_id_map_size; i++) {
processor_id_map[i] = processor_id_unassigned;
}
#endif
// 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
#ifndef OVERRIDE_LIBPATH
#define DEFAULT_LIBPATH "/lib:/usr/lib"
#else
#define DEFAULT_LIBPATH OVERRIDE_LIBPATH
#endif
#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 = 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);
if (!set_boot_path('/', ':')) {
vm_exit_during_initialization("Failed setting boot class path.", NULL);
}
}
// 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 accommodate 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 = 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 = 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);
if (!set_boot_path('/', ':')) {
vm_exit_during_initialization("Failed setting boot class path.", NULL);
}
}
// 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 accommodate 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 = 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
}
//////////////////////////////////////////////////////////////////////////////
// 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
// Thread start routine for all newly created threads
static void *thread_native_entry(Thread *thread) {
thread->record_stack_base_and_size();
thread->initialize_thread_current();
OSThread* osthread = thread->osthread();
Monitor* sync = osthread->startThread_lock();
osthread->set_thread_id(os::Bsd::gettid());
#ifdef __APPLE__
// Store unique OS X thread id used by SA
osthread->set_unique_thread_id();
#endif
// initialize signal mask for this thread
PosixSignals::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
{
MutexLocker 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_without_safepoint_check();
}
}
log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
os::current_thread_id(), (uintx) pthread_self());
// call one more level start routine
thread->call_run();
// Note: at this point the thread object may already have deleted itself.
// Prevent dereferencing it from here on out.
thread = NULL;
log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
os::current_thread_id(), (uintx) pthread_self());
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();
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;
{
ResourceMark rm;
pthread_t tid;
int ret = 0;
int limit = 3;
do {
ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
} while (ret == EAGAIN && limit-- > 0);
char buf[64];
if (ret == 0) {
log_info(os, thread)("Thread \"%s\" started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
thread->name(), (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
} else {
log_warning(os, thread)("Failed to start thread \"%s\" - pthread_create failed (%s) for attributes: %s.",
thread->name(), os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
// Log some OS information which might explain why creating the thread failed.
log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
LogStream st(Log(os, thread)::info());
os::Posix::print_rlimit_info(&st);
os::print_memory_info(&st);
}
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();
MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
while ((state = osthread->get_state()) == ALLOCATED) {
sync_with_child->wait_without_safepoint_check();
}
}
}
// 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();
if (osthread == NULL) {
return false;
}
osthread->set_thread_id(os::Bsd::gettid());
#ifdef __APPLE__
// Store unique OS X thread id used by SA
osthread->set_unique_thread_id();
#endif
// Store pthread info into the OSThread
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
PosixSignals::hotspot_sigmask(thread);
log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT
", stack: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k) ).",
os::current_thread_id(), (uintx) pthread_self(),
p2i(thread->stack_base()), p2i(thread->stack_end()), thread->stack_size());
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();
MutexLocker 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
double os::elapsedVTime() {
// better than nothing, but not much
return elapsedTime();
}
#ifdef __APPLE__
void os::Bsd::clock_init() {
mach_timebase_info(&_timebase_info);
}
#else
void os::Bsd::clock_init() {
// Nothing to do
}
#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(&Bsd::_max_abstime, prev, now);
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;
}
void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
info_ptr->max_value = ALL_64_BITS;
info_ptr->may_skip_backward = false; // not subject to resetting or drifting
info_ptr->may_skip_forward = false; // not subject to resetting or drifting
info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
}
#endif // __APPLE__
// Information of current thread in variety of formats
pid_t os::Bsd::gettid() {
int retval = -1;
#ifdef __APPLE__ // XNU kernel
mach_port_t port = mach_thread_self();
guarantee(MACH_PORT_VALID(port), "just checking");
mach_port_deallocate(mach_task_self(), port);
return (pid_t)port;
#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)os::Bsd::gettid();
#else
return (intx)::pthread_self();
#endif
}
int os::current_process_id() {
return (int)(getpid());
}
// DLL functions
static int local_dladdr(const void* addr, Dl_info* info) {
#ifdef __APPLE__
if (addr == (void*)-1) {
// dladdr() in macOS12/Monterey returns success for -1, but that addr
// value should not be allowed to work to avoid confusion.
return 0;
}
#endif
return dladdr(addr, info);
}
// 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;
}
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;
if (local_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;
}
#ifndef __APPLE__
// The 6-parameter Decoder::decode() function is not implemented on macOS.
// The Mach-O binary format does not contain a "list of files" with address
// ranges like ELF. That makes sense since Mach-O can contain binaries for
// than one instruction set so there can be more than one address range for
// each "file".
// 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;
}
}
#else // __APPLE__
#define MACH_MAXSYMLEN 256
char localbuf[MACH_MAXSYMLEN];
// 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;
}
#undef MACH_MAXSYMLEN
#endif // __APPLE__
}
buf[0] = '\0';
if (offset != NULL) *offset = -1;
return false;
}
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 (local_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
log_info(os)("attempting shared library load of %s", filename);
void * result= ::dlopen(filename, RTLD_LAZY);
if (result != NULL) {
Events::log_dll_message(NULL, "Loaded shared library %s", filename);
// Successful loading
log_info(os)("shared library load of %s was successful", filename);
return result;
}
const char* error_report = ::dlerror();
if (error_report == NULL) {
error_report = "dlerror returned no error description";
}
if (ebuf != NULL && ebuflen > 0) {
// Read system error message into ebuf
::strncpy(ebuf, error_report, ebuflen-1);
ebuf[ebuflen-1]='\0';
}
Events::log_dll_message(NULL, "Loading shared library %s failed, %s", filename, error_report);
log_info(os)("shared library load of %s failed, %s", filename, error_report);
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
log_info(os)("attempting shared library load of %s", filename);
void * result= ::dlopen(filename, RTLD_LAZY);
if (result != NULL) {
Events::log_dll_message(NULL, "Loaded shared library %s", filename);
// Successful loading
log_info(os)("shared library load of %s was successful", filename);
return result;
}
Elf32_Ehdr elf_head;
const char* const error_report = ::dlerror();
if (error_report == NULL) {
error_report = "dlerror returned no error description";
}
if (ebuf != NULL && ebuflen > 0) {
// Read system error message into ebuf
::strncpy(ebuf, error_report, ebuflen-1);
ebuf[ebuflen-1]='\0';
}
Events::log_dll_message(NULL, "Loading shared library %s failed, %s", filename, error_report);
log_info(os)("shared library load of %s failed, %s", filename, error_report);
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_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 __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, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
#endif
// Identify compatibility 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__
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));
}
#ifdef __APPLE__
char osproductversion[100];
size_t sz = sizeof(osproductversion);
int ret = sysctlbyname("kern.osproductversion", osproductversion, &sz, NULL, 0);
if (ret == 0) {
char build[100];
size = sizeof(build);
int mib_build[] = { CTL_KERN, KERN_OSVERSION };
if (sysctl(mib_build, 2, build, &size, NULL, 0) < 0) {
snprintf(buf, buflen, "%s %s, macOS %s", os, release, osproductversion);
} else {
snprintf(buf, buflen, "%s %s, macOS %s (%s)", os, release, osproductversion, build);
}
} else
#endif
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_cr("OS:");
os::Posix::print_uname_info(st);
os::Bsd::print_uptime_info(st);
os::Posix::print_rlimit_info(st);
os::Posix::print_load_average(st);
VM_Version::print_platform_virtualization_info(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));
}
#if defined(__APPLE__) && !defined(ZERO)
if (VM_Version::is_cpu_emulated()) {
snprintf(buf, buflen, "\"%s\" %s (EMULATED) %d MHz", model, machine, mhz);
} else {
NOT_AARCH64(snprintf(buf, buflen, "\"%s\" %s %d MHz", model, machine, mhz));
// aarch64 CPU doesn't report its speed
AARCH64_ONLY(snprintf(buf, buflen, "\"%s\" %s", model, machine));
}
#else
snprintf(buf, buflen, "\"%s\" %s %d MHz", model, machine, mhz);
#endif
}
void os::print_memory_info(outputStream* st) {
xsw_usage swap_usage;
size_t size = sizeof(swap_usage);
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);
if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
if (size >= offset_of(xsw_usage, xsu_used)) {
st->print(", swap " UINT64_FORMAT "k",
((julong) swap_usage.xsu_total) >> 10);
st->print("(" UINT64_FORMAT "k free)",
((julong) swap_usage.xsu_avail) >> 10);
}
}
st->cr();
}
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];
dli_fname[0] = '\0';
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';
}
////////////////////////////////////////////////////////////////////////////////
// Virtual Memory
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;
#if defined(__OpenBSD__)
// XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
if (::mprotect(addr, size, prot) == 0) {
return true;
}
#elif defined(__APPLE__)
if (exec) {
// Do not replace MAP_JIT mappings, see JDK-8234930
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;
}
}
#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;
}
int os::numa_get_group_id_for_address(const void* address) {
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, bool exec) {
#if defined(__OpenBSD__)
// XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
return ::mprotect(addr, size, PROT_NONE) == 0;
#elif defined(__APPLE__)
if (exec) {
if (::madvise(addr, size, MADV_FREE) != 0) {
return false;
}
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;
}
#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);
}
// '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 exec) {
// MAP_FIXED is intentionally left out, to leave existing mappings intact.
const int flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS
MACOS_ONLY(| (exec ? MAP_JIT : 0));
// 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.
char* 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, bool exec) {
return anon_mmap(NULL /* addr */, bytes, exec);
}
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::vm_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::vm_page_size());
Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
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::pd_reserve_memory_special(size_t bytes, size_t alignment, size_t page_size, char* req_addr, bool exec) {
fatal("os::reserve_memory_special should not be called on BSD.");
return NULL;
}
bool os::pd_release_memory_special(char* base, size_t bytes) {
fatal("os::release_memory_special should not be called on BSD.");
return false;
}
size_t os::large_page_size() {
return _large_page_size;
}
bool os::can_commit_large_page_memory() {
// Does not matter, we do not support huge pages.
return false;
}
bool os::can_execute_large_page_memory() {
// Does not matter, we do not support huge pages.
return false;
}
char* os::pd_attempt_map_memory_to_file_at(char* requested_addr, size_t bytes, int file_desc) {
assert(file_desc >= 0, "file_desc is not valid");
char* result = pd_attempt_reserve_memory_at(requested_addr, bytes, !ExecMem);
if (result != NULL) {
if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
}
}
return result;
}
// 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(char* requested_addr, size_t bytes, bool exec) {
// 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, exec);
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);
}
return NULL;
}
// 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 may require system level permission
// (e.g., root privilege or CAP_SYS_NICE capability).
#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) {
if (geteuid() != 0) {
if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) {
warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
"e.g., being the root user. If the necessary permission is not " \
"possessed, changes to priority will be silently ignored.");
}
}
}
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);
return (ret == 0) ? OS_OK : OS_ERR;
#elif defined(__APPLE__) || defined(__NetBSD__)
struct sched_param sp;
int policy;
if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
return OS_ERR;
}
sp.sched_priority = newpri;
if (pthread_setschedparam(thread->osthread()->pthread_id(), 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;
int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
if (res != 0) {
*priority_ptr = -1;
return OS_ERR;
} else {
*priority_ptr = sp.sched_priority;
return OS_OK;
}
#else
*priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
#endif
return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
}
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
int page_size = getpagesize();
OSInfo::set_vm_page_size(page_size);
OSInfo::set_vm_allocation_granularity(page_size);
if (os::vm_page_size() <= 0) {
fatal("os_bsd.cpp: os::init: getpagesize() failed (%s)", os::strerror(errno));
}
_page_sizes.add(os::vm_page_size());
Bsd::initialize_system_info();
// _main_thread points to the thread that created/loaded the JVM.
Bsd::_main_thread = pthread_self();
Bsd::clock_init();
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) {
// This could be set after os::Posix::init() but all platforms
// have to set it the same so we have to mirror Solaris.
DEBUG_ONLY(os::set_mutex_init_done();)
os::Posix::init_2();
if (PosixSignals::init() == JNI_ERR) {
return JNI_ERR;
}
// Check and sets minimum stack sizes against command line options
if (set_minimum_stack_sizes() == JNI_ERR) {
return JNI_ERR;
}
// Not supported.
FLAG_SET_ERGO(UseNUMA, false);
FLAG_SET_ERGO(UseNUMAInterleaving, false);
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;
}
int os::active_processor_count() {
// User has overridden the number of active processors
if (ActiveProcessorCount > 0) {
log_trace(os)("active_processor_count: "
"active processor count set by user : %d",
ActiveProcessorCount);
--> --------------------
--> maximum size reached
--> --------------------
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