author | mr |
Tue, 29 Oct 2019 13:52:04 -0700 | |
changeset 58850 | f4290bf1cc21 |
parent 58503 | 726a3945e934 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2019, 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 "memory/universe.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
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#include "runtime/javaCalls.hpp" |
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#include "runtime/notificationThread.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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|
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NotificationThread* NotificationThread::_instance = NULL; |
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void NotificationThread::initialize() { |
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EXCEPTION_MARK; |
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|
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const char* name = "Notification Thread"; |
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Handle string = java_lang_String::create_from_str(name, CHECK); |
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|
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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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Handle thread_oop = JavaCalls::construct_new_instance( |
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SystemDictionary::Thread_klass(), |
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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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Klass* group = SystemDictionary::ThreadGroup_klass(); |
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JavaValue result(T_VOID); |
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JavaCalls::call_special(&result, |
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thread_group, |
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group, |
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vmSymbols::add_method_name(), |
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vmSymbols::thread_void_signature(), |
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thread_oop, |
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THREAD); |
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{ |
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MutexLocker mu(Threads_lock); |
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NotificationThread* thread = new NotificationThread(¬ification_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 NotificationThread::notification_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_dcmd_notification_event = false; |
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bool has_gc_notification_event = false; |
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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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ThreadBlockInVM tbivm(jt); |
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MonitorLocker ml(Notification_lock, Mutex::_no_safepoint_check_flag); |
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// Process all available work on each (outer) iteration, rather than |
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// only the first recognized bit of work, to avoid frequently true early |
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// tests from potentially starving later work. Hence the use of |
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// arithmetic-or to combine results; we don't want short-circuiting. |
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while (((sensors_changed = LowMemoryDetector::has_pending_requests()) | |
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(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) | |
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(has_gc_notification_event = GCNotifier::has_event())) |
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== 0) { |
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// Wait as a suspend equalent until notified that there is some work to do. |
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ml.wait(0, true); |
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} |
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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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} |
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} |
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