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1 /* |
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2 * Copyright 2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test |
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26 * @bug 5014783 |
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27 * @summary Basic unit test of thread states returned by |
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28 * Thread.getState(). |
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29 * |
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30 * @author Mandy Chung |
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31 * |
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32 * @build ThreadStateTest |
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33 * @run main ThreadStateTest |
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34 */ |
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35 |
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36 import java.util.concurrent.locks.LockSupport; |
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37 import java.util.concurrent.Semaphore; |
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38 |
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39 public class ThreadStateTest { |
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40 private static boolean testFailed = false; |
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41 |
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42 static class Lock { |
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43 private String name; |
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44 Lock(String name) { |
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45 this.name = name; |
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46 } |
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47 public String toString() { |
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48 return name; |
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49 } |
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50 } |
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51 private static Lock globalLock = new Lock("my lock"); |
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52 |
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53 public static void main(String[] argv) { |
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54 // Call Thread.getState to force all initialization done |
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55 // before test verification begins. |
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56 Thread.currentThread().getState(); |
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57 MyThread myThread = new MyThread("MyThread"); |
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58 |
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59 // before myThread starts |
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60 checkThreadState(myThread, Thread.State.NEW); |
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61 |
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62 myThread.start(); |
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63 myThread.waitUntilStarted(); |
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64 checkThreadState(myThread, Thread.State.RUNNABLE); |
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65 |
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66 synchronized (globalLock) { |
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67 myThread.goBlocked(); |
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68 checkThreadState(myThread, Thread.State.BLOCKED); |
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69 } |
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70 |
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71 myThread.goWaiting(); |
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72 checkThreadState(myThread, Thread.State.WAITING); |
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73 |
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74 myThread.goTimedWaiting(); |
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75 checkThreadState(myThread, Thread.State.TIMED_WAITING); |
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76 |
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77 |
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78 /* |
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79 *********** park and parkUntil seems not working |
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80 * ignore this case for now. |
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81 * Bug ID 5062095 |
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82 *********************************************** |
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83 |
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84 myThread.goParked(); |
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85 checkThreadState(myThread, Thread.State.WAITING); |
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86 |
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87 myThread.goTimedParked(); |
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88 checkThreadState(myThread, Thread.State.TIMED_WAITING); |
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89 */ |
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90 |
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91 |
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92 myThread.goSleeping(); |
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93 checkThreadState(myThread, Thread.State.TIMED_WAITING); |
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94 |
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95 myThread.terminate(); |
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96 checkThreadState(myThread, Thread.State.TERMINATED); |
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97 |
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98 try { |
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99 myThread.join(); |
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100 } catch (InterruptedException e) { |
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101 e.printStackTrace(); |
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102 System.out.println("Unexpected exception."); |
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103 testFailed = true; |
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104 } |
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105 if (testFailed) |
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106 throw new RuntimeException("TEST FAILED."); |
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107 System.out.println("Test passed."); |
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108 } |
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109 |
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110 private static void checkThreadState(Thread t, Thread.State expected) { |
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111 Thread.State state = t.getState(); |
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112 System.out.println("Checking thread state " + state); |
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113 if (state == null) { |
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114 throw new RuntimeException(t.getName() + " expected to have " + |
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115 expected + " but got null."); |
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116 } |
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117 |
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118 if (state != expected) { |
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119 throw new RuntimeException(t.getName() + " expected to have " + |
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120 expected + " but got " + state); |
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121 } |
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122 } |
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123 |
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124 private static String getLockName(Object lock) { |
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125 if (lock == null) return null; |
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126 |
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127 return lock.getClass().getName() + '@' + |
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128 Integer.toHexString(System.identityHashCode(lock)); |
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129 } |
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130 |
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131 private static void goSleep(long ms) { |
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132 try { |
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133 Thread.sleep(ms); |
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134 } catch (InterruptedException e) { |
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135 e.printStackTrace(); |
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136 System.out.println("Unexpected exception."); |
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137 testFailed = true; |
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138 } |
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139 } |
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140 |
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141 static class MyThread extends Thread { |
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142 private ThreadExecutionSynchronizer thrsync = new ThreadExecutionSynchronizer(); |
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143 |
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144 MyThread(String name) { |
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145 super(name); |
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146 } |
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147 |
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148 private final int RUNNABLE = 0; |
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149 private final int BLOCKED = 1; |
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150 private final int WAITING = 2; |
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151 private final int TIMED_WAITING = 3; |
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152 private final int PARKED = 4; |
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153 private final int TIMED_PARKED = 5; |
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154 private final int SLEEPING = 6; |
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155 private final int TERMINATE = 7; |
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156 private int state = RUNNABLE; |
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157 |
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158 private boolean done = false; |
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159 public void run() { |
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160 // Signal main thread to continue. |
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161 thrsync.signal(); |
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162 while (!done) { |
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163 switch (state) { |
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164 case RUNNABLE: { |
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165 double sum = 0; |
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166 for (int i = 0; i < 1000; i++) { |
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167 double r = Math.random(); |
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168 double x = Math.pow(3, r); |
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169 sum += x - r; |
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170 } |
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171 break; |
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172 } |
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173 case BLOCKED: { |
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174 // signal main thread. |
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175 thrsync.signal(); |
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176 System.out.println(" myThread is going to block."); |
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177 synchronized (globalLock) { |
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178 // finish blocking |
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179 state = RUNNABLE; |
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180 } |
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181 break; |
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182 } |
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183 case WAITING: { |
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184 synchronized (globalLock) { |
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185 // signal main thread. |
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186 thrsync.signal(); |
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187 System.out.println(" myThread is going to wait."); |
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188 try { |
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189 globalLock.wait(); |
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190 } catch (InterruptedException e) { |
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191 // ignore |
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192 } |
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193 } |
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194 break; |
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195 } |
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196 case TIMED_WAITING: { |
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197 synchronized (globalLock) { |
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198 // signal main thread. |
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199 thrsync.signal(); |
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200 System.out.println(" myThread is going to timed wait."); |
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201 try { |
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202 globalLock.wait(10000); |
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203 } catch (InterruptedException e) { |
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204 // ignore |
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205 } |
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206 } |
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207 break; |
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208 } |
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209 case PARKED: { |
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210 // signal main thread. |
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211 thrsync.signal(); |
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212 System.out.println(" myThread is going to park."); |
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213 LockSupport.park(); |
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214 // give a chance for the main thread to block |
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215 goSleep(10); |
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216 break; |
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217 } |
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218 case TIMED_PARKED: { |
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219 // signal main thread. |
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220 thrsync.signal(); |
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221 System.out.println(" myThread is going to timed park."); |
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222 long deadline = System.currentTimeMillis() + 10000*1000; |
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223 LockSupport.parkUntil(deadline); |
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224 |
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225 // give a chance for the main thread to block |
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226 goSleep(10); |
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227 break; |
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228 } |
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229 case SLEEPING: { |
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230 // signal main thread. |
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231 thrsync.signal(); |
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232 System.out.println(" myThread is going to sleep."); |
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233 try { |
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234 Thread.sleep(1000000); |
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235 } catch (InterruptedException e) { |
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236 // finish sleeping |
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237 interrupted(); |
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238 } |
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239 break; |
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240 } |
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241 case TERMINATE: { |
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242 done = true; |
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243 // signal main thread. |
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244 thrsync.signal(); |
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245 break; |
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246 } |
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247 default: |
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248 break; |
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249 } |
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250 } |
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251 } |
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252 public void waitUntilStarted() { |
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253 // wait for MyThread. |
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254 thrsync.waitForSignal(); |
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255 goSleep(10); |
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256 } |
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257 |
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258 public void goBlocked() { |
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259 System.out.println("Waiting myThread to go blocked."); |
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260 setState(BLOCKED); |
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261 // wait for MyThread to get blocked |
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262 thrsync.waitForSignal(); |
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263 goSleep(20); |
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264 } |
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265 |
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266 public void goWaiting() { |
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267 System.out.println("Waiting myThread to go waiting."); |
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268 setState(WAITING); |
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269 // wait for MyThread to wait on object. |
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270 thrsync.waitForSignal(); |
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271 goSleep(20); |
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272 } |
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273 public void goTimedWaiting() { |
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274 System.out.println("Waiting myThread to go timed waiting."); |
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275 setState(TIMED_WAITING); |
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276 // wait for MyThread timed wait call. |
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277 thrsync.waitForSignal(); |
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278 goSleep(20); |
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279 } |
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280 public void goParked() { |
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281 System.out.println("Waiting myThread to go parked."); |
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282 setState(PARKED); |
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283 // wait for MyThread state change to PARKED. |
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284 thrsync.waitForSignal(); |
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285 goSleep(20); |
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286 } |
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287 public void goTimedParked() { |
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288 System.out.println("Waiting myThread to go timed parked."); |
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289 setState(TIMED_PARKED); |
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290 // wait for MyThread. |
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291 thrsync.waitForSignal(); |
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292 goSleep(20); |
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293 } |
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294 |
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295 public void goSleeping() { |
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296 System.out.println("Waiting myThread to go sleeping."); |
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297 setState(SLEEPING); |
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298 // wait for MyThread. |
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299 thrsync.waitForSignal(); |
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300 goSleep(20); |
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301 } |
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302 public void terminate() { |
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303 System.out.println("Waiting myThread to terminate."); |
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304 setState(TERMINATE); |
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305 // wait for MyThread. |
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306 thrsync.waitForSignal(); |
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307 goSleep(20); |
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308 } |
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309 |
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310 private void setState(int newState) { |
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311 switch (state) { |
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312 case BLOCKED: |
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313 while (state == BLOCKED) { |
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314 goSleep(20); |
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315 } |
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316 state = newState; |
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317 break; |
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318 case WAITING: |
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319 case TIMED_WAITING: |
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320 state = newState; |
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321 synchronized (globalLock) { |
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322 globalLock.notify(); |
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323 } |
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324 break; |
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325 case PARKED: |
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326 case TIMED_PARKED: |
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327 state = newState; |
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328 LockSupport.unpark(this); |
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329 break; |
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330 case SLEEPING: |
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331 state = newState; |
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332 this.interrupt(); |
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333 break; |
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334 default: |
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335 state = newState; |
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336 break; |
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337 } |
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338 } |
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339 } |
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340 |
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341 |
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342 |
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343 static class ThreadExecutionSynchronizer { |
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344 |
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345 private boolean waiting; |
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346 private Semaphore semaphore; |
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347 |
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348 public ThreadExecutionSynchronizer() { |
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349 semaphore = new Semaphore(1); |
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350 waiting = false; |
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351 } |
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352 |
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353 // Synchronizes two threads execution points. |
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354 // Basically any thread could get scheduled to run and |
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355 // it is not possible to know which thread reaches expected |
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356 // execution point. So whichever thread reaches a execution |
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357 // point first wait for the second thread. When the second thread |
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358 // reaches the expected execution point will wake up |
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359 // the thread which is waiting here. |
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360 void stopOrGo() { |
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361 semaphore.acquireUninterruptibly(); // Thread can get blocked. |
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362 if (!waiting) { |
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363 waiting = true; |
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364 // Wait for second thread to enter this method. |
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365 while(!semaphore.hasQueuedThreads()) { |
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366 try { |
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367 Thread.sleep(20); |
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368 } catch (InterruptedException xx) {} |
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369 } |
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370 semaphore.release(); |
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371 } else { |
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372 waiting = false; |
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373 semaphore.release(); |
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374 } |
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375 } |
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376 |
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377 // Wrapper function just for code readability. |
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378 void waitForSignal() { |
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379 stopOrGo(); |
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380 } |
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381 |
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382 void signal() { |
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383 stopOrGo(); |
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384 } |
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385 } |
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386 } |