Mercurial > hg > truffle
annotate test/serviceability/threads/TestFalseDeadLock.java @ 20145:80fda5775d0c
folding a TypeCheckNode can only be done if the stamp of the input object denotes an exact type
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 02 Apr 2015 19:21:59 +0200 |
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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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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 |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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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 |
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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 |
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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 |
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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 } |