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comparison: test/serviceability/threads/TestFalseDeadLock.java
test/serviceability/threads/TestFalseDeadLock.java
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| 1 /* | |
| 2 * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 */ | |
| 23 | |
| 24 import java.lang.management.ManagementFactory; | |
| 25 import java.lang.management.ThreadMXBean; | |
| 26 import java.util.Random; | |
| 27 | |
| 28 /* | |
| 29 * @test | |
| 30 * @bug 8016304 | |
| 31 * @summary Make sure no deadlock is reported for this program which has no deadlocks. | |
| 32 * @run main/othervm TestFalseDeadLock | |
| 33 */ | |
| 34 | |
| 35 /* | |
| 36 * This test will not provoke the bug every time it is run since the bug is intermittent. | |
| 37 * The test has a fixed running time of 5 seconds. | |
| 38 */ | |
| 39 | |
| 40 public class TestFalseDeadLock { | |
| 41 private static ThreadMXBean bean; | |
| 42 private static volatile boolean running = true; | |
| 43 private static volatile boolean found = false; | |
| 44 | |
| 45 public static void main(String[] args) throws Exception { | |
| 46 bean = ManagementFactory.getThreadMXBean(); | |
| 47 Thread[] threads = new Thread[500]; | |
| 48 for (int i = 0; i < threads.length; i++) { | |
| 49 Test t = new Test(); | |
| 50 threads[i] = new Thread(t); | |
| 51 threads[i].start(); | |
| 52 } | |
| 53 try { | |
| 54 Thread.sleep(5000); | |
| 55 } catch (InterruptedException ex) { | |
| 56 } | |
| 57 running = false; | |
| 58 for (Thread t : threads) { | |
| 59 t.join(); | |
| 60 } | |
| 61 if (found) { | |
| 62 throw new Exception("Deadlock reported, but there is no deadlock."); | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 public static class Test implements Runnable { | |
| 67 public void run() { | |
| 68 Random r = new Random(); | |
| 69 while (running) { | |
| 70 try { | |
| 71 synchronized (this) { | |
| 72 wait(r.nextInt(1000) + 1); | |
| 73 } | |
| 74 } catch (InterruptedException ex) { | |
| 75 } | |
| 76 recurse(2000); | |
| 77 } | |
| 78 if (bean.findDeadlockedThreads() != null) { | |
| 79 System.out.println("FOUND!"); | |
| 80 found = true; | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 private void recurse(int i) { | |
| 85 if (!running) { | |
| 86 // It is important for the test to call println here | |
| 87 // since there are locks inside that path. | |
| 88 System.out.println("Hullo"); | |
| 89 } | |
| 90 else if (i > 0) { | |
| 91 recurse(i - 1); | |
| 92 } | |
| 93 } | |
| 94 } | |
| 95 } |
