Mercurial > hg > truffle
view src/share/vm/runtime/serviceThread.cpp @ 16017:8d8c6a40d8e2
Backed out changeset: a1b9340534bf
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 04 Jun 2014 19:17:22 +0200 |
parents | 4ca6dc0799b6 |
children | 7848fc12602b |
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/* * Copyright (c) 2012, 2013, 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. * */ #include "precompiled.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/javaCalls.hpp" #include "runtime/serviceThread.hpp" #include "runtime/mutexLocker.hpp" #include "prims/jvmtiImpl.hpp" #include "services/gcNotifier.hpp" #include "services/diagnosticArgument.hpp" #include "services/diagnosticFramework.hpp" ServiceThread* ServiceThread::_instance = NULL; void ServiceThread::initialize() { EXCEPTION_MARK; instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass()); instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); const char* name = JDK_Version::is_gte_jdk17x_version() ? "Service Thread" : "Low Memory Detector"; Handle string = java_lang_String::create_from_str(name, CHECK); // Initialize thread_oop to put it into the system threadGroup Handle thread_group (THREAD, Universe::system_thread_group()); JavaValue result(T_VOID); JavaCalls::call_special(&result, thread_oop, klass, vmSymbols::object_initializer_name(), vmSymbols::threadgroup_string_void_signature(), thread_group, string, CHECK); { MutexLocker mu(Threads_lock); ServiceThread* thread = new ServiceThread(&service_thread_entry); // At this point it may be possible that no osthread was created for the // JavaThread due to lack of memory. We would have to throw an exception // in that case. However, since this must work and we do not allow // exceptions anyway, check and abort if this fails. if (thread == NULL || thread->osthread() == NULL) { vm_exit_during_initialization("java.lang.OutOfMemoryError", "unable to create new native thread"); } java_lang_Thread::set_thread(thread_oop(), thread); java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); java_lang_Thread::set_daemon(thread_oop()); thread->set_threadObj(thread_oop()); _instance = thread; Threads::add(thread); Thread::start(thread); } } void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) { while (true) { bool sensors_changed = false; bool has_jvmti_events = false; bool has_gc_notification_event = false; bool has_dcmd_notification_event = false; JvmtiDeferredEvent jvmti_event; { // Need state transition ThreadBlockInVM so that this thread // will be handled by safepoint correctly when this thread is // notified at a safepoint. // This ThreadBlockInVM object is not also considered to be // suspend-equivalent because ServiceThread is not visible to // external suspension. ThreadBlockInVM tbivm(jt); MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) && !(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) && !(has_gc_notification_event = GCNotifier::has_event()) && !(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification())) { // wait until one of the sensors has pending requests, or there is a // pending JVMTI event or JMX GC notification to post Service_lock->wait(Mutex::_no_safepoint_check_flag); } if (has_jvmti_events) { jvmti_event = JvmtiDeferredEventQueue::dequeue(); } } if (has_jvmti_events) { jvmti_event.post(); } if (sensors_changed) { LowMemoryDetector::process_sensor_changes(jt); } if(has_gc_notification_event) { GCNotifier::sendNotification(CHECK); } if(has_dcmd_notification_event) { DCmdFactory::send_notification(CHECK); } } } bool ServiceThread::is_service_thread(Thread* thread) { return thread == _instance; }