Mercurial > hg > Members > kono > jpf-core
annotate src/classes/java/lang/Thread.java @ 0:61d41facf527
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author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Fri, 23 Jan 2015 10:14:01 -0800 |
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1 /* |
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2 * Copyright (C) 2014, United States Government, as represented by the |
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3 * Administrator of the National Aeronautics and Space Administration. |
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4 * All rights reserved. |
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5 * |
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the |
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except |
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8 * in compliance with the License. You may obtain a copy of the License at |
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9 * |
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10 * http://www.apache.org/licenses/LICENSE-2.0. |
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11 * |
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12 * Unless required by applicable law or agreed to in writing, software |
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13 * distributed under the License is distributed on an "AS IS" BASIS, |
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 * See the License for the specific language governing permissions and |
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16 * limitations under the License. |
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17 */ |
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18 package java.lang; |
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19 |
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20 import gov.nasa.jpf.annotation.NeverBreak; |
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21 import sun.nio.ch.Interruptible; |
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22 |
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23 /** |
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24 * MJI model class for java.lang.Thread library abstraction |
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25 * |
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26 * <2do> this should not require the JPF ThreadList to retrieve corresponding ThreadInfos |
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27 * (the ThreadList might not store terminated threads) |
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28 */ |
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29 public class Thread implements Runnable { |
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30 |
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31 public interface UncaughtExceptionHandler { |
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32 // note this doesn't stop the thread from being terminated |
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33 void uncaughtException (Thread t, Throwable x); |
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34 } |
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35 |
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36 static int nameThreadNum; // to construct the default thread name |
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37 |
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38 public static final int MIN_PRIORITY = 1; |
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39 public static final int NORM_PRIORITY = 5; |
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40 public static final int MAX_PRIORITY = 10; |
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41 |
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42 // don't rename this - it's used by ThreadGoup.uncaughtException() |
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43 private static volatile UncaughtExceptionHandler defaultUncaughtExceptionHandler; // null by default |
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44 |
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45 // initialized in init(), except of the main thread (which gets explicitly initialized by the VM) |
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46 ThreadGroup group; |
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47 Runnable target; |
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48 String name; |
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49 int priority; |
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50 boolean isDaemon; |
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51 |
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52 // this is an explicit thread state that gets set on a call of interrupt(), but |
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53 // only if the thread is not blocked. If it is, we only change the status. |
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54 // this gets cleared by calling interrupted() |
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55 boolean interrupted; |
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56 |
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57 // those are only accessed from peers since thread obects are per se shared |
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58 @NeverBreak |
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59 ThreadLocal.Entry<?>[] threadLocals; |
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60 |
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61 // this is what we use for sun.misc.Unsafe.park()/unpark() |
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62 // this is accessed from the native peer, VM.createMainThread() and sun.misc.Unsafe |
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63 static class Permit { |
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64 boolean blockPark = true; // this is used to remember unpark() calls before park() (they don't accumulate) |
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65 } |
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66 Permit permit; // the object is used for wait/notify |
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67 |
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68 // referenced by java.util.concurrent.locks.LockSupport via sun.misc.Unsafe |
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69 // DON'T CHANGE THIS NAME |
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70 volatile Object parkBlocker; |
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71 |
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72 // used to store Thread.stop() exceptions |
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73 Throwable stopException; |
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74 |
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75 private volatile UncaughtExceptionHandler uncaughtExceptionHandler; // null by default |
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76 |
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77 |
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78 public enum State { BLOCKED, NEW, RUNNABLE, TERMINATED, TIMED_WAITING, WAITING } |
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79 |
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80 |
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81 public static void setDefaultUncaughtExceptionHandler(UncaughtExceptionHandler xh) { |
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82 defaultUncaughtExceptionHandler = xh; |
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83 } |
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84 |
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85 public static UncaughtExceptionHandler getDefaultUncaughtExceptionHandler(){ |
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86 return defaultUncaughtExceptionHandler; |
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87 } |
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88 |
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89 |
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90 public Thread () { |
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91 this(null, null, null, 0L); |
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92 } |
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93 |
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94 public Thread (Runnable target) { |
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95 this(null, target, null, 0L); |
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96 } |
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97 |
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98 public Thread (Runnable target, String name) { |
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99 this(null, target, name, 0L); |
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100 } |
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101 |
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102 public Thread (String name) { |
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103 this(null, null, name, 0L); |
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104 } |
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105 |
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106 public Thread (ThreadGroup group, String name) { |
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107 this(group, null, name, 0L); |
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108 } |
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109 |
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110 public Thread (ThreadGroup group, Runnable target) { |
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111 this(group, target, null, 0L); |
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112 } |
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113 |
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114 public Thread (ThreadGroup group, Runnable target, String name) { |
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115 this(group, target, name, 0L); |
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116 } |
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117 |
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118 public Thread (ThreadGroup group, Runnable target, String name, long stackSize) { |
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119 Thread cur = currentThread(); |
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120 |
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121 if (group == null) { |
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122 this.group = cur.getThreadGroup(); |
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123 } else { |
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124 this.group = group; |
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125 } |
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126 |
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127 this.group.add(this); |
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128 |
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129 if (name == null) { |
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130 this.name = "Thread-" + ++nameThreadNum; |
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131 } else { |
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132 this.name = name; |
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133 } |
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134 |
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135 this.permit = new Permit(); |
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136 |
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137 // those are always inherited from the current thread |
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138 this.priority = cur.getPriority(); |
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139 this.isDaemon = cur.isDaemon(); |
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140 |
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141 this.target = target; |
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142 |
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143 // do our associated native init |
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144 init0(this.group, target, this.name, stackSize); |
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145 |
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146 initThreadLocals(cur); |
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147 } |
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148 |
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149 // this takes care of ThreadInfo initialization |
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150 native void init0 (ThreadGroup group, Runnable target, String name, long stackSize); |
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151 |
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152 // this is here since InheritableThreadLocals would require childValue(parentVal) roundtrips. |
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153 // Unfortunately we can't defer this until the ThreadLocal is actually accessed since |
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154 // we have to capture the value at the point of child creation |
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155 // Note this executes in the parent thread |
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156 private void initThreadLocals (Thread parent){ |
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157 ThreadLocal.Entry<?>[] tl = parent.threadLocals; |
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158 if (tl != null){ |
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159 int len = tl.length; |
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160 ThreadLocal.Entry<?>[] inherited = null; |
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161 int j=0; |
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162 |
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163 for (int i=0; i<len; i++){ |
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164 ThreadLocal.Entry<?> e = tl[i]; |
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165 ThreadLocal.Entry<?> ec = e.getChildEntry(); |
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166 if (ec != null){ |
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167 if (inherited == null){ |
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168 inherited = new ThreadLocal.Entry<?>[len]; |
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169 } |
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170 inherited[j++] = ec; |
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171 } |
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172 } |
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173 |
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174 if (inherited != null){ |
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175 ThreadLocal.Entry<?>[] a = new ThreadLocal.Entry<?>[j]; |
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176 System.arraycopy(inherited,0,a,0,j); |
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177 threadLocals = a; |
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178 } |
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179 } |
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180 } |
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181 |
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182 public static int activeCount () { |
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183 return 0; |
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184 } |
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185 |
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186 public void setUncaughtExceptionHandler(UncaughtExceptionHandler xh) { |
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187 uncaughtExceptionHandler = xh; |
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188 } |
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189 |
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190 public UncaughtExceptionHandler getUncaughtExceptionHandler(){ |
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191 if (uncaughtExceptionHandler != null){ |
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192 return uncaughtExceptionHandler; |
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193 } else { |
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194 return group; |
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195 } |
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196 } |
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197 |
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198 public void setContextClassLoader (ClassLoader cl) { |
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199 } |
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200 |
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201 public ClassLoader getContextClassLoader () { |
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202 // <NSY> |
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203 return null; |
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204 } |
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205 |
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206 public synchronized void setDaemon (boolean isDaemon) { |
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207 this.isDaemon = isDaemon; |
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208 setDaemon0(isDaemon); |
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209 } |
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210 |
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211 public boolean isDaemon () { |
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212 return isDaemon; |
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213 } |
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214 |
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215 public native long getId(); |
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216 |
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217 public StackTraceElement[] getStackTrace() { |
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218 return null; // not yet implemented |
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219 } |
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220 |
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221 public native int getState0(); |
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222 |
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223 public Thread.State getState() { |
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224 int i = getState0(); |
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225 switch (i) { |
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226 case 0: return State.BLOCKED; |
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227 case 1: return State.NEW; |
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228 case 2: return State.RUNNABLE; |
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229 case 3: return State.TERMINATED; |
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230 case 4: return State.TIMED_WAITING; |
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231 case 5: return State.WAITING; |
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232 } |
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233 |
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234 return null; // shoudl be intercepted by a getState0 assertion |
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235 } |
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236 |
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237 public synchronized void setName (String name) { |
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238 if (name == null) { |
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239 throw new IllegalArgumentException("thread name can't be null"); |
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240 } |
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241 |
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242 this.name = name; |
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243 setName0(name); |
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244 } |
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245 |
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246 public String getName () { |
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247 return name; |
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248 } |
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249 |
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250 public void setPriority (int priority) { |
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251 if ((priority < MIN_PRIORITY) || (priority > MAX_PRIORITY)) { |
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252 throw new IllegalArgumentException("thread priority out of range"); |
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253 } |
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254 |
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255 this.priority = priority; |
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256 setPriority0(priority); |
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257 } |
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258 |
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259 public int getPriority () { |
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260 return priority; |
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261 } |
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262 |
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263 public ThreadGroup getThreadGroup () { |
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264 return group; |
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265 } |
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266 |
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267 public void checkAccess () { |
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268 // <NSY> |
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269 } |
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270 |
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271 public native int countStackFrames (); |
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272 |
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273 public static native Thread currentThread (); |
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274 |
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275 public void destroy () { |
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276 } |
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277 |
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278 public static void dumpStack () { |
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279 } |
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280 |
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281 public static int enumerate (Thread[] tarray) { |
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282 Thread cur = currentThread(); |
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283 |
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284 return cur.group.enumerate(tarray); |
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285 } |
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286 |
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287 public static native boolean holdsLock (Object obj); |
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288 |
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289 // this one needs to be native because it might change the thread status |
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290 public native void interrupt (); |
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291 |
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292 // those don't have to be native, but we keep it symmetric |
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293 public static native boolean interrupted (); |
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294 public native boolean isInterrupted (); |
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295 |
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296 public native boolean isAlive (); |
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297 |
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298 |
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299 /** |
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300 * note these are not synchronized anymore since they are intercepted by the |
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301 * native peer. The reason is that we don't want two CGs per join call (one for the |
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302 * sync call, and one for the wait) because this can cause serious |
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303 * performance degradation |
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304 */ |
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305 public void join () throws InterruptedException { |
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306 synchronized(this){ |
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307 |
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308 if (interrupted()) { |
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309 throw new InterruptedException(); |
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310 } |
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311 |
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312 while (isAlive()) { |
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313 // apparently, the JDK doesn't throw InterruptedExceptions if |
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314 // we get interrupted after waiting in the join |
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315 wait(); |
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316 } |
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317 } |
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318 } |
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319 |
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320 public void join (long millis) throws InterruptedException { |
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321 join(millis, 0); |
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322 } |
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323 |
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324 public void join (long millis, int nanos) throws InterruptedException { |
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325 |
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326 if (millis < 0){ |
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327 throw new java.lang.IllegalArgumentException("timeout value is negative"); |
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328 |
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329 } else if (millis == 0){ |
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330 join(); |
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331 |
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332 } else { |
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333 synchronized(this){ |
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334 if (interrupted()){ |
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335 throw new InterruptedException(); |
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336 } |
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337 |
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338 wait(millis); |
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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 |
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344 |
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345 @Override |
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346 public void run () { |
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347 if (target != null) { |
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348 target.run(); |
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349 } |
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350 } |
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351 |
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352 public static void sleep (long millis) throws InterruptedException { |
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353 sleep(millis, 0); |
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354 } |
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355 |
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356 public static native void sleep (long millis, int nanos) |
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357 throws InterruptedException; |
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358 |
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359 public native void start(); |
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360 public native void stop(); |
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361 public native void stop(Throwable obj); |
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362 |
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363 public native void suspend(); |
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364 public native void resume(); |
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365 |
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366 |
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367 @Override |
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368 public String toString () { |
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369 return ("Thread[" + name + ',' + priority + ',' + (group == null ? "" : group.getName()) + ']'); |
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370 } |
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371 |
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372 public static native void yield (); |
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373 |
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374 native void setDaemon0 (boolean on); |
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375 |
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376 native void setName0 (String name); |
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377 |
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378 native void setPriority0 (int priority); |
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379 |
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380 |
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381 |
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382 /** |
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383 * automatically called by system upon thread termination to clean up |
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384 * references. |
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385 * |
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386 * NOTE - we clean up atomically during ThreadInfo.finish(), to avoid any |
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387 * additional states. This is important since group per se is a shared object |
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388 * We only include this method here as a specification for ThreadInfo |
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389 */ |
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390 private void exit () { |
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391 if (group != null){ |
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392 group.threadTerminated(this); |
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393 group = null; |
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394 } |
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395 |
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396 threadLocals = null; |
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397 parkBlocker = null; |
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398 uncaughtExceptionHandler = null; |
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399 } |
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400 |
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401 // some Java 6 mojo |
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402 // <2do> not implemented yet |
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403 native void blockedOn (Interruptible b); |
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404 |
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405 |
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406 // we probably will remove these fields once we modeled java.util.concurrent.ThreadLocalRandom |
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407 // to make it deterministic |
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408 long threadLocalRandomSeed; |
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409 int threadLocalRandomProbe; |
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410 int threadLocalRandomSecondarySeed; |
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411 } |