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annotate test/compiler/testlibrary/rtm/BusyLock.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 com.oracle.java.testlibrary.Utils; |
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28 import sun.misc.Unsafe; |
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29 |
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30 import java.util.concurrent.BrokenBarrierException; |
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31 import java.util.concurrent.CyclicBarrier; |
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32 |
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33 /** |
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34 * Test case for busy lock scenario. |
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35 * One thread enters the monitor and sleep for a while. |
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36 * Another thread is blocked on the same monitor. |
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37 */ |
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38 public class BusyLock implements CompilableTest, Runnable { |
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39 private static final int DEFAULT_TIMEOUT = 1000; |
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40 private final CyclicBarrier barrier; |
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41 |
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42 // Following field have to be static in order to avoid escape analysis. |
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43 @SuppressWarnings("UnsuedDeclaration") |
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44 private static int field = 0; |
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45 private static final Unsafe UNSAFE = Utils.getUnsafe(); |
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46 protected final Object monitor; |
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47 protected final int timeout; |
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48 |
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49 public BusyLock() { |
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50 this(BusyLock.DEFAULT_TIMEOUT); |
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51 } |
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52 |
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53 public BusyLock(int timeout) { |
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54 this.timeout = timeout; |
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55 this.monitor = new Object(); |
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56 this.barrier = new CyclicBarrier(2); |
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57 } |
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58 |
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59 @Override |
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60 public void run() { |
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61 try { |
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62 // wait until forceAbort leave monitor |
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63 barrier.await(); |
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64 if (UNSAFE.tryMonitorEnter(monitor)) { |
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65 try { |
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66 barrier.await(); |
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67 Thread.sleep(timeout); |
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68 } finally { |
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69 UNSAFE.monitorExit(monitor); |
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70 } |
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71 } else { |
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72 throw new RuntimeException("Monitor should be entered by " + |
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73 "::run() first."); |
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74 } |
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75 } catch (InterruptedException | BrokenBarrierException e) { |
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76 throw new RuntimeException("Synchronization error happened.", e); |
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77 } |
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78 } |
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79 |
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80 public void test() { |
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81 try { |
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82 barrier.await(); |
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83 // wait until monitor is locked by a ::run method |
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84 barrier.await(); |
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85 } catch (InterruptedException | BrokenBarrierException e) { |
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86 throw new RuntimeException("Synchronization error happened.", e); |
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87 } |
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88 synchronized(monitor) { |
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89 BusyLock.field++; |
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90 } |
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91 } |
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92 |
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93 @Override |
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94 public String getMethodWithLockName() { |
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95 return this.getClass().getName() + "::test"; |
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96 } |
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97 |
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98 @Override |
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99 public String[] getMethodsToCompileNames() { |
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100 return new String[] { getMethodWithLockName() }; |
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101 } |
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102 |
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103 /** |
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104 * Usage: |
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105 * BusyLock [ <inflate monitor> [ <timeout> ] ] |
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106 * |
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107 * Default values are: |
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108 * <ul> |
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109 * <li>inflate monitor = {@code true}</li> |
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110 * <li>timeout = {@code BusyLock.DEFAULT_TIMEOUT}</li> |
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111 * </ul> |
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112 */ |
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113 public static void main(String args[]) throws Exception { |
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114 int timeoutValue = BusyLock.DEFAULT_TIMEOUT; |
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115 boolean inflateMonitor = true; |
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116 |
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117 if (args.length > 0 ) { |
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118 inflateMonitor = Boolean.valueOf(args[0]); |
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119 |
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120 if (args.length > 1) { |
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121 timeoutValue = Integer.valueOf(args[1]); |
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122 } |
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123 } |
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124 |
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125 BusyLock busyLock = new BusyLock(timeoutValue); |
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126 |
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127 if (inflateMonitor) { |
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128 AbortProvoker.inflateMonitor(busyLock.monitor); |
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129 } |
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130 |
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131 Thread t = new Thread(busyLock); |
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132 t.start(); |
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133 busyLock.test(); |
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134 t.join(); |
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135 } |
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136 } |