97 lines
3.5 KiB
Java
97 lines
3.5 KiB
Java
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/*
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* Copyright 2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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* @test
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* @bug 6717789
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* @summary Check that a lock is not held when a LeaseManager expires.
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* @author Eamonn McManus
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*/
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import com.sun.jmx.event.LeaseManager;
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadMXBean;
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import java.util.Arrays;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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public class LeaseManagerDeadlockTest {
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public static String failure;
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public static LeaseManager leaseManager;
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public static Semaphore callbackThreadCompleted = new Semaphore(0);
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public static Object lock = new Object();
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public static Runnable triggerDeadlock = new Runnable() {
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public void run() {
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Runnable pingLeaseManager = new Runnable() {
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public void run() {
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System.out.println("Ping thread starts");
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synchronized (lock) {
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leaseManager.lease(1);
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}
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System.out.println("Ping thread completes");
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}
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};
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Thread t = new Thread(pingLeaseManager);
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t.start();
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try {
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Thread.sleep(10); // enough time for ping thread to grab lock
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synchronized (lock) {
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t.join();
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}
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} catch (InterruptedException e) {
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fail(e.toString());
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}
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System.out.println("Callback thread completes");
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callbackThreadCompleted.release();
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}
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};
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public static void main(String[] args) throws Exception {
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// Also test that we can shorten the lease from its initial value.
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leaseManager = new LeaseManager(triggerDeadlock, 1000000);
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leaseManager.lease(1L);
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boolean callbackRan =
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callbackThreadCompleted.tryAcquire(3, TimeUnit.SECONDS);
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if (!callbackRan) {
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fail("Callback did not complete - probable deadlock");
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ThreadMXBean threads = ManagementFactory.getThreadMXBean();
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System.out.println(Arrays.toString(threads.findDeadlockedThreads()));
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System.out.println("PRESS RETURN");
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System.in.read();
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}
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if (failure == null)
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System.out.println("TEST PASSED");
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else
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throw new Exception("TEST FAILED: " + failure);
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}
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public static void fail(String why) {
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System.out.println("TEST FAILS: " + why);
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failure = why;
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}
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}
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