| /* |
| * Copyright (c) 2005, 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 5086470 |
| * @key intermittent |
| * @summary Basic Test for the following methods: |
| * - ThreadMXBean.findDeadlockedThreads() |
| * - ThreadMXBean.findMonitorDeadlockedThreads() |
| * @author Mandy Chung |
| * |
| * @build MonitorDeadlock |
| * @build SynchronizerDeadlock |
| * @build ThreadDump |
| * @run main/othervm FindDeadlocks |
| */ |
| |
| import java.lang.management.*; |
| import java.util.*; |
| |
| public class FindDeadlocks { |
| static ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
| public static void main(String[] argv) { |
| ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
| // create deadlocked threads |
| MonitorDeadlock md = new MonitorDeadlock(); |
| |
| // no deadlock |
| if (findDeadlocks() != null) { |
| throw new RuntimeException("TEST FAILED: Should return null."); |
| } |
| |
| // Let the threads to proceed |
| md.goDeadlock(); |
| // wait until the deadlock is ready |
| md.waitUntilDeadlock(); |
| |
| long[] mthreads = findDeadlocks(); |
| if (mthreads == null) { |
| ThreadDump.dumpStacks(); |
| throw new RuntimeException("TEST FAILED: Deadlock not detected."); |
| } |
| md.checkResult(mthreads); |
| |
| // create deadlocked threads on synchronizers |
| SynchronizerDeadlock sd = new SynchronizerDeadlock(); |
| |
| // Let the threads to proceed |
| sd.goDeadlock(); |
| // wait until the deadlock is ready |
| sd.waitUntilDeadlock(); |
| |
| // Find Deadlock |
| long[] threads = findDeadlocks(); |
| if (threads == null) { |
| ThreadDump.dumpStacks(); |
| throw new RuntimeException("TEST FAILED: Deadlock not detected."); |
| } |
| |
| // form a list of newly deadlocked threads |
| long[] newList = new long[threads.length - mthreads.length]; |
| int count = 0; |
| for (int i = 0; i < threads.length; i++) { |
| long id = threads[i]; |
| boolean isNew = true; |
| for (int j = 0; j < mthreads.length; j++) { |
| if (mthreads[j] == id) { |
| isNew = false; |
| break; |
| } |
| } |
| if (isNew) { |
| newList[count++] = id; |
| } |
| } |
| |
| if (mbean.isSynchronizerUsageSupported()) { |
| sd.checkResult(newList); |
| } else { |
| // monitoring of synchronizer usage not supported |
| if (count != 0) { |
| throw new RuntimeException("TEST FAILED: NewList should be empty."); |
| } |
| } |
| |
| // 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]); |
| } |
| |
| System.out.println("Test passed"); |
| } |
| static long[] findDeadlocks() { |
| long[] threads; |
| if (mbean.isSynchronizerUsageSupported()) { |
| threads = mbean.findDeadlockedThreads(); |
| } else { |
| threads = mbean.findMonitorDeadlockedThreads(); |
| } |
| return threads; |
| } |
| |
| } |