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annotate test/compiler/testlibrary/rtm/MemoryConflictProvoker.java @ 18377:ed0fce2e999a
Fold klass._java_mirror._klass into klass and improve stamps from layout_helper
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Fri, 14 Nov 2014 09:32:59 -0800 |
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1 /* |
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2 * Copyright (c) 2014, 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 |
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25 package rtm; |
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26 |
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27 import java.util.concurrent.BrokenBarrierException; |
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28 import java.util.concurrent.CyclicBarrier; |
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29 |
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30 /** |
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31 * To force transactional execution abort due to memory conflict |
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32 * one thread should access memory region from transactional region |
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33 * while another thread should modify the same memory region. |
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34 * Since this scenario is based on the race condition between threads |
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35 * you should not expect some particular amount of aborts. |
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36 */ |
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37 class MemoryConflictProvoker extends AbortProvoker { |
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38 // Following field have to be static in order to avoid escape analysis. |
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39 @SuppressWarnings("UnsuedDeclaration") |
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40 private static int field = 0; |
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41 private static final int INNER_ITERATIONS = 10000; |
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42 private final CyclicBarrier barrier; |
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43 /** |
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44 * This thread will access and modify memory region |
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45 * from outside of the transaction. |
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46 */ |
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47 private final Runnable conflictingThread; |
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48 |
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49 public MemoryConflictProvoker() { |
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50 this(new Object()); |
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51 } |
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52 |
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53 public MemoryConflictProvoker(Object monitor) { |
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54 super(monitor); |
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55 barrier = new CyclicBarrier(2); |
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56 conflictingThread = () -> { |
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57 try { |
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58 barrier.await(); |
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59 } catch (Exception e) { |
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60 throw new RuntimeException(e); |
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61 } |
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62 for (int i = 0; i < MemoryConflictProvoker.INNER_ITERATIONS; i++) { |
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63 MemoryConflictProvoker.field++; |
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64 } |
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65 }; |
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66 } |
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67 |
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68 /** |
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69 * Accesses and modifies memory region from within the transaction. |
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70 */ |
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71 public void transactionalRegion() { |
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72 try { |
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73 barrier.await(); |
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74 } catch (InterruptedException | BrokenBarrierException e) { |
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75 throw new RuntimeException(e); |
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76 } |
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77 for (int i = 0; i < MemoryConflictProvoker.INNER_ITERATIONS; i++) { |
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78 synchronized(monitor) { |
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79 MemoryConflictProvoker.field--; |
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80 } |
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81 } |
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82 } |
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83 |
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84 @Override |
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85 public void forceAbort() { |
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86 try { |
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87 Thread t = new Thread(conflictingThread); |
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88 t.start(); |
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89 transactionalRegion(); |
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90 t.join(); |
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91 } catch (Exception e) { |
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92 throw new RuntimeException(e); |
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93 } |
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94 } |
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95 |
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96 @Override |
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97 public String getMethodWithLockName() { |
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98 return this.getClass().getName() + "::transactionalRegion"; |
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99 } |
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100 } |