128 lines
4.2 KiB
Java
128 lines
4.2 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 5086470
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* @key intermittent
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* @summary Basic Test for the following methods:
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* - ThreadMXBean.findDeadlockedThreads()
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* - ThreadMXBean.findMonitorDeadlockedThreads()
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* @author Mandy Chung
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*
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* @build MonitorDeadlock
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* @build SynchronizerDeadlock
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* @build ThreadDump
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* @run main/othervm FindDeadlocks
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*/
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import java.lang.management.*;
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import java.util.*;
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public class FindDeadlocks {
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static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
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public static void main(String[] argv) {
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ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
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// create deadlocked threads
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MonitorDeadlock md = new MonitorDeadlock();
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// no deadlock
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if (findDeadlocks() != null) {
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throw new RuntimeException("TEST FAILED: Should return null.");
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}
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// Let the threads to proceed
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md.goDeadlock();
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// wait until the deadlock is ready
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md.waitUntilDeadlock();
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long[] mthreads = findDeadlocks();
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if (mthreads == null) {
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ThreadDump.dumpStacks();
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throw new RuntimeException("TEST FAILED: Deadlock not detected.");
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}
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md.checkResult(mthreads);
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// create deadlocked threads on synchronizers
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SynchronizerDeadlock sd = new SynchronizerDeadlock();
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// Let the threads to proceed
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sd.goDeadlock();
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// wait until the deadlock is ready
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sd.waitUntilDeadlock();
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// Find Deadlock
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long[] threads = findDeadlocks();
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if (threads == null) {
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ThreadDump.dumpStacks();
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throw new RuntimeException("TEST FAILED: Deadlock not detected.");
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}
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// form a list of newly deadlocked threads
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long[] newList = new long[threads.length - mthreads.length];
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int count = 0;
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for (int i = 0; i < threads.length; i++) {
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long id = threads[i];
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boolean isNew = true;
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for (int j = 0; j < mthreads.length; j++) {
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if (mthreads[j] == id) {
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isNew = false;
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break;
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}
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}
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if (isNew) {
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newList[count++] = id;
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}
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}
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if (mbean.isSynchronizerUsageSupported()) {
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sd.checkResult(newList);
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} else {
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// monitoring of synchronizer usage not supported
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if (count != 0) {
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throw new RuntimeException("TEST FAILED: NewList should be empty.");
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}
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}
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// Print Deadlock stack trace
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System.out.println("Found threads that are in deadlock:-");
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ThreadInfo[] infos = mbean.getThreadInfo(threads, Integer.MAX_VALUE);
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for (int i = 0; i < infos.length; i++) {
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ThreadDump.printThreadInfo(infos[i]);
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}
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System.out.println("Test passed");
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}
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static long[] findDeadlocks() {
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long[] threads;
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if (mbean.isSynchronizerUsageSupported()) {
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threads = mbean.findDeadlockedThreads();
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} else {
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threads = mbean.findMonitorDeadlockedThreads();
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}
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return threads;
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}
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}
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