82 lines
2.8 KiB
Java
82 lines
2.8 KiB
Java
/*
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* Copyright (c) 2005, 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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* @test
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* @bug 6337571
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* @summary Test if findDeadlockedThreads works for an ownable synchronizer
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* in shared mode which has no owner when a thread is parked.
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* @author Mandy Chung
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*
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* @run main/othervm SharedSynchronizer
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*/
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import java.util.concurrent.*;
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadMXBean;
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public class SharedSynchronizer {
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public static void main(String[] args) throws Exception {
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MyThread t = new MyThread();
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t.setDaemon(true);
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t.start();
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ThreadMXBean tmbean = ManagementFactory.getThreadMXBean();
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if (!tmbean.isSynchronizerUsageSupported()) {
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System.out.println("Monitoring of synchronizer usage not supported")
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;
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return;
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}
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long[] result = tmbean.findDeadlockedThreads();
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if (result != null) {
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throw new RuntimeException("TEST FAILED: result should be null");
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}
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}
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static class MyThread extends Thread {
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public void run() {
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FutureTask f = new FutureTask(
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new Callable() {
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public Object call() {
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throw new RuntimeException("should never reach here");
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}
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}
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);
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// A FutureTask uses the AbstractOwnableSynchronizer in a shared
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// mode (not exclusive mode). When the thread calls f.get(),
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// it will put to park on the ownable synchronizer that
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// is not owned by any thread.
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try {
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f.get();
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} catch (Exception e) {
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RuntimeException re = new RuntimeException(e.getMessage());
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re.initCause(e);
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throw re;
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}
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}
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}
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}
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