Mercurial > hg > truffle

annotate test/compiler/testlibrary/rtm/AbortProvoker.java @ 18408:2c3666f44855

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Truffle: initial commit of object API implementation
author Andreas Woess <andreas.woess@jku.at>
date Tue, 18 Nov 2014 23:19:43 +0100
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 java.util.Objects;
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28 import java.util.concurrent.BrokenBarrierException;
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29 import java.util.concurrent.CyclicBarrier;
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30
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31 import com.oracle.java.testlibrary.Asserts;
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32 import com.oracle.java.testlibrary.Utils;
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33 import sun.misc.Unsafe;
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34
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35 /**
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36 * Base class for different transactional execution abortion
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37 * provokers aimed to force abort due to specified reason.
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38 */
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39 public abstract class AbortProvoker implements CompilableTest {
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40 public static final long DEFAULT_ITERATIONS = 10000L;
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41 /**
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42 * Inflates monitor associated with object {@code monitor}.
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43 * Inflation is forced by entering the same monitor from
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44 * two different threads.
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45 *
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46 * @param monitor monitor to be inflated.
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47 * @return inflated monitor.
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48 * @throws Exception if something went wrong.
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49 */
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50 public static Object inflateMonitor(Object monitor) throws Exception {
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51 Unsafe unsafe = Utils.getUnsafe();
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52 CyclicBarrier barrier = new CyclicBarrier(2);
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53
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54 Runnable inflatingRunnable = () -> {
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55 unsafe.monitorEnter(monitor);
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56 try {
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57 barrier.await();
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58 barrier.await();
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59 } catch (InterruptedException | BrokenBarrierException e) {
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60 throw new RuntimeException(
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61 "Synchronization issue occurred.", e);
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62 } finally {
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63 unsafe.monitorExit(monitor);
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64 }
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65 };
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66
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67 Thread t = new Thread(inflatingRunnable);
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68 t.start();
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69 // Wait until thread t enters the monitor.
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70 barrier.await();
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71 // At this point monitor will be owned by thread t,
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72 // so our attempt to enter the same monitor will force
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73 // monitor inflation.
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74 Asserts.assertFalse(unsafe.tryMonitorEnter(monitor),
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75 "Not supposed to enter the monitor first");
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76 barrier.await();
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77 t.join();
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78 return monitor;
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79 }
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80
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81
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82 /**
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83 * Get instance of specified AbortProvoker, inflate associated monitor
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84 * if needed and then invoke forceAbort method in a loop.
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85 *
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86 * Usage:
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87 * AbortProvoker &lt;AbortType name&gt; [&lt;inflate monitor&gt
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88 * [&lt;iterations&gt; [ &lt;delay&gt;]]]
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89 *
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90 * Default parameters are:
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91 * <ul>
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92 * <li>inflate monitor = <b>true</b></li>
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93 * <li>iterations = {@code AbortProvoker.DEFAULT_ITERATIONS}</li>
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94 * <li>delay = <b>0</b></li>
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95 * </ul>
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96 */
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97 public static void main(String args[]) throws Throwable {
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98 Asserts.assertGT(args.length, 0, "At least one argument is required.");
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99
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100 AbortType abortType = AbortType.lookup(Integer.valueOf(args[0]));
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101 boolean monitorShouldBeInflated = true;
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102 long iterations = AbortProvoker.DEFAULT_ITERATIONS;
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103
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104 if (args.length > 1) {
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105 monitorShouldBeInflated = Boolean.valueOf(args[1]);
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106
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107 if (args.length > 2) {
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108 iterations = Long.valueOf(args[2]);
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109
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110 if (args.length > 3) {
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111 Thread.sleep(Integer.valueOf(args[3]));
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112 }
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113 }
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114 }
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115
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116 AbortProvoker provoker = abortType.provoker();
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117
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118 if (monitorShouldBeInflated) {
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119 provoker.inflateMonitor();
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120 }
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121
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122 for (long i = 0; i < iterations; i++) {
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123 provoker.forceAbort();
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124 }
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125 }
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126
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127 protected final Object monitor;
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128
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129 protected AbortProvoker() {
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130 this(new Object());
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131 }
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132
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133 protected AbortProvoker(Object monitor) {
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134 this.monitor = Objects.requireNonNull(monitor);
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135 }
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136
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137 /**
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138 * Inflates monitor used by this AbortProvoker instance.
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139 * @throws Exception
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140 */
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141 public void inflateMonitor() throws Exception {
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142 AbortProvoker.inflateMonitor(monitor);
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143 }
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144
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145 /**
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146 * Forces transactional execution abortion.
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147 */
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148 public abstract void forceAbort();
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149
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150 /**
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151 * Returns names of all methods that have to be compiled
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152 * in order to successfully force transactional execution
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153 * abortion.
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154 *
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155 * @return array with methods' names that have to be compiled.
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156 */
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157 @Override
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158 public String[] getMethodsToCompileNames() {
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159 return new String[] { getMethodWithLockName() };
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160 }
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161
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162 /**
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163 * Returns name of the method that will contain monitor whose locking
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164 * will be elided using transactional execution.
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165 *
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166 * @return name of the method that will contain elided lock.
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167 */
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168 @Override
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169 public String getMethodWithLockName() {
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170 return this.getClass().getName() + "::forceAbort";
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171 }
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172 }