J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | |
| 25 | /* |
| 26 | * @test |
| 27 | * @bug 5086470 |
| 28 | * @summary Basic Test for the following methods: |
| 29 | * - ThreadMXBean.findDeadlockedThreads() |
| 30 | * - ThreadMXBean.findMonitorDeadlockedThreads() |
| 31 | * @author Mandy Chung |
| 32 | * |
| 33 | * @build MonitorDeadlock |
| 34 | * @build SynchronizerDeadlock |
| 35 | * @build ThreadDump |
| 36 | * @run main FindDeadlocks |
| 37 | */ |
| 38 | |
| 39 | import java.lang.management.*; |
| 40 | import java.util.*; |
| 41 | |
| 42 | public class FindDeadlocks { |
| 43 | static ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
| 44 | public static void main(String[] argv) { |
| 45 | ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
| 46 | // create deadlocked threads |
| 47 | MonitorDeadlock md = new MonitorDeadlock(); |
| 48 | |
| 49 | // no deadlock |
| 50 | if (findDeadlocks() != null) { |
| 51 | throw new RuntimeException("TEST FAILED: Should return null."); |
| 52 | } |
| 53 | |
| 54 | // Let the threads to proceed |
| 55 | md.goDeadlock(); |
| 56 | // wait until the deadlock is ready |
| 57 | md.waitUntilDeadlock(); |
| 58 | |
| 59 | long[] mthreads = findDeadlocks(); |
| 60 | if (mthreads == null) { |
| 61 | ThreadDump.dumpStacks(); |
| 62 | throw new RuntimeException("TEST FAILED: Deadlock not detected."); |
| 63 | } |
| 64 | md.checkResult(mthreads); |
| 65 | |
| 66 | // create deadlocked threads on synchronizers |
| 67 | SynchronizerDeadlock sd = new SynchronizerDeadlock(); |
| 68 | |
| 69 | // Let the threads to proceed |
| 70 | sd.goDeadlock(); |
| 71 | // wait until the deadlock is ready |
| 72 | sd.waitUntilDeadlock(); |
| 73 | |
| 74 | // Find Deadlock |
| 75 | long[] threads = findDeadlocks(); |
| 76 | if (threads == null) { |
| 77 | ThreadDump.dumpStacks(); |
| 78 | throw new RuntimeException("TEST FAILED: Deadlock not detected."); |
| 79 | } |
| 80 | |
| 81 | // form a list of newly deadlocked threads |
| 82 | long[] newList = new long[threads.length - mthreads.length]; |
| 83 | int count = 0; |
| 84 | for (int i = 0; i < threads.length; i++) { |
| 85 | long id = threads[i]; |
| 86 | boolean isNew = true; |
| 87 | for (int j = 0; j < mthreads.length; j++) { |
| 88 | if (mthreads[j] == id) { |
| 89 | isNew = false; |
| 90 | break; |
| 91 | } |
| 92 | } |
| 93 | if (isNew) { |
| 94 | newList[count++] = id; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | if (mbean.isSynchronizerUsageSupported()) { |
| 99 | sd.checkResult(newList); |
| 100 | } else { |
| 101 | // monitoring of synchronizer usage not supported |
| 102 | if (count != 0) { |
| 103 | throw new RuntimeException("TEST FAILED: NewList should be empty."); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | // Print Deadlock stack trace |
| 108 | System.out.println("Found threads that are in deadlock:-"); |
| 109 | ThreadInfo[] infos = mbean.getThreadInfo(threads, Integer.MAX_VALUE); |
| 110 | for (int i = 0; i < infos.length; i++) { |
| 111 | ThreadDump.printThreadInfo(infos[i]); |
| 112 | } |
| 113 | |
| 114 | System.out.println("Test passed"); |
| 115 | } |
| 116 | static long[] findDeadlocks() { |
| 117 | long[] threads; |
| 118 | if (mbean.isSynchronizerUsageSupported()) { |
| 119 | threads = mbean.findDeadlockedThreads(); |
| 120 | } else { |
| 121 | threads = mbean.findMonitorDeadlockedThreads(); |
| 122 | } |
| 123 | return threads; |
| 124 | } |
| 125 | |
| 126 | } |