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annotate test/compiler/testlibrary/rtm/BusyLock.java @ 21142:0b221b4ad707

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Merge
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Tue, 28 Apr 2015 12:58:40 -0700
parents 665bbe93823f
children
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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 [ &lt;inflate monitor&gt; [ &lt;timeout&gt; ] ]
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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 }