Mercurial > hg > truffle
comparison test/serviceability/threads/TestFalseDeadLock.java @ 10985:ef748153ee8f
8016304: ThreadMXBean.getDeadlockedThreads reports bogus deadlocks on JDK 8
Reviewed-by: dcubed, mgronlun
author | sla |
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date | Mon, 17 Jun 2013 18:35:44 +0200 |
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10984:cd2118b62475 | 10985:ef748153ee8f |
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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 } |