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annotate test/serviceability/threads/TestFalseDeadLock.java @ 10985:ef748153ee8f

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8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8 Reviewed-by: dcubed, mgronlun
author sla
date Mon, 17 Jun 2013 18:35:44 +0200
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10985
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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1 /*
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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6 * under the terms of the GNU General Public License version 2 only, as
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
ef748153ee8f 8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
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24 import java.lang.management.ManagementFactory;
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25 import java.lang.management.ThreadMXBean;
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26 import java.util.Random;
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27
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28 /*
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29 * @test
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30 * @bug 8016304
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31 * @summary Make sure no deadlock is reported for this program which has no deadlocks.
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32 * @run main/othervm TestFalseDeadLock
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33 */
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34
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35 /*
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36 * This test will not provoke the bug every time it is run since the bug is intermittent.
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37 * The test has a fixed running time of 5 seconds.
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38 */
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39
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40 public class TestFalseDeadLock {
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41 private static ThreadMXBean bean;
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42 private static volatile boolean running = true;
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43 private static volatile boolean found = false;
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44
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45 public static void main(String[] args) throws Exception {
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46 bean = ManagementFactory.getThreadMXBean();
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47 Thread[] threads = new Thread[500];
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48 for (int i = 0; i < threads.length; i++) {
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49 Test t = new Test();
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50 threads[i] = new Thread(t);
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51 threads[i].start();
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52 }
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53 try {
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54 Thread.sleep(5000);
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55 } catch (InterruptedException ex) {
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56 }
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57 running = false;
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58 for (Thread t : threads) {
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59 t.join();
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60 }
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61 if (found) {
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62 throw new Exception("Deadlock reported, but there is no deadlock.");
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63 }
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64 }
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65
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66 public static class Test implements Runnable {
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67 public void run() {
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68 Random r = new Random();
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69 while (running) {
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70 try {
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71 synchronized (this) {
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72 wait(r.nextInt(1000) + 1);
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73 }
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74 } catch (InterruptedException ex) {
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75 }
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76 recurse(2000);
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77 }
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78 if (bean.findDeadlockedThreads() != null) {
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79 System.out.println("FOUND!");
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80 found = true;
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81 }
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82 }
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83
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84 private void recurse(int i) {
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85 if (!running) {
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86 // It is important for the test to call println here
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87 // since there are locks inside that path.
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88 System.out.println("Hullo");
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89 }
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90 else if (i > 0) {
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91 recurse(i - 1);
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92 }
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93 }
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94 }
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95 }