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/*
* Copyright (c) 2003, 2015, 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 4892507
* @summary Basic Test for the following reset methods:
* - ThreadMXBean.findMonitorDeadlockedThreads()
* @author Mandy Chung
*
* @build MonitorDeadlock
* @build ThreadDump
* @run main/othervm FindMonitorDeadlock
*/
import java.lang.management.*;
import java.util.*;
public class FindMonitorDeadlock {
public static void main(String[] argv) {
// create deadlocked threads
MonitorDeadlock md = new MonitorDeadlock();
// No deadlock
ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
long[] threads = mbean.findMonitorDeadlockedThreads();
if (threads != null) {
throw new RuntimeException("TEST FAILED: Should return null.");
}
// Let the threads to proceed
md.goDeadlock();
// wait until the deadlock is ready
md.waitUntilDeadlock();
// Find Deadlock
threads = mbean.findMonitorDeadlockedThreads();
if (threads == null) {
ThreadDump.dumpStacks();
throw new RuntimeException("TEST FAILED: Deadlock not detected.");
}
// Print Deadlock stack trace
System.out.println("Found threads that are in deadlock:-");
ThreadInfo[] infos = mbean.getThreadInfo(threads, Integer.MAX_VALUE);
for (int i = 0; i < infos.length; i++) {
ThreadDump.printThreadInfo(infos[i]);
}
md.checkResult(threads);
System.out.println("Test passed");
}
}
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