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