145 lines
5.1 KiB
C++
145 lines
5.1 KiB
C++
/*
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* Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/serviceThread.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.hpp"
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#include "prims/jvmtiImpl.hpp"
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#include "services/allocationContextService.hpp"
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#include "services/diagnosticArgument.hpp"
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#include "services/diagnosticFramework.hpp"
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#include "services/gcNotifier.hpp"
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#include "services/lowMemoryDetector.hpp"
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ServiceThread* ServiceThread::_instance = NULL;
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void ServiceThread::initialize() {
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EXCEPTION_MARK;
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instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass());
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instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
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const char* name = "Service Thread";
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Handle string = java_lang_String::create_from_str(name, CHECK);
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// Initialize thread_oop to put it into the system threadGroup
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Handle thread_group (THREAD, Universe::system_thread_group());
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JavaValue result(T_VOID);
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JavaCalls::call_special(&result, thread_oop,
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klass,
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vmSymbols::object_initializer_name(),
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vmSymbols::threadgroup_string_void_signature(),
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thread_group,
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string,
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CHECK);
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{
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MutexLocker mu(Threads_lock);
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ServiceThread* thread = new ServiceThread(&service_thread_entry);
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// At this point it may be possible that no osthread was created for the
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// JavaThread due to lack of memory. We would have to throw an exception
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// in that case. However, since this must work and we do not allow
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// exceptions anyway, check and abort if this fails.
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if (thread == NULL || thread->osthread() == NULL) {
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vm_exit_during_initialization("java.lang.OutOfMemoryError",
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os::native_thread_creation_failed_msg());
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}
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java_lang_Thread::set_thread(thread_oop(), thread);
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java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
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java_lang_Thread::set_daemon(thread_oop());
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thread->set_threadObj(thread_oop());
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_instance = thread;
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Threads::add(thread);
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Thread::start(thread);
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}
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}
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void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
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while (true) {
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bool sensors_changed = false;
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bool has_jvmti_events = false;
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bool has_gc_notification_event = false;
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bool has_dcmd_notification_event = false;
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bool acs_notify = false;
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JvmtiDeferredEvent jvmti_event;
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{
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// Need state transition ThreadBlockInVM so that this thread
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// will be handled by safepoint correctly when this thread is
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// notified at a safepoint.
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// This ThreadBlockInVM object is not also considered to be
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// suspend-equivalent because ServiceThread is not visible to
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// external suspension.
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ThreadBlockInVM tbivm(jt);
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MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
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while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) &&
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!(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) &&
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!(has_gc_notification_event = GCNotifier::has_event()) &&
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!(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) &&
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!(acs_notify = AllocationContextService::should_notify())) {
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// wait until one of the sensors has pending requests, or there is a
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// pending JVMTI event or JMX GC notification to post
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Service_lock->wait(Mutex::_no_safepoint_check_flag);
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}
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if (has_jvmti_events) {
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jvmti_event = JvmtiDeferredEventQueue::dequeue();
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}
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}
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if (has_jvmti_events) {
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jvmti_event.post();
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}
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if (sensors_changed) {
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LowMemoryDetector::process_sensor_changes(jt);
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}
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if(has_gc_notification_event) {
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GCNotifier::sendNotification(CHECK);
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}
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if(has_dcmd_notification_event) {
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DCmdFactory::send_notification(CHECK);
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}
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if (acs_notify) {
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AllocationContextService::notify(CHECK);
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}
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}
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}
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bool ServiceThread::is_service_thread(Thread* thread) {
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return thread == _instance;
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}
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