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annotate src/classes/gov/nasa/jpf/FinalizerThread.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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 gov.nasa.jpf;
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19
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20 /**
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21 * @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
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22 *
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23 * Represents the finalizer thread which runs finalize() methods upon
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24 * garbage collection of finalizable objects, i.e. the class of a finalizable
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25 * object overrides the Object.finalize() method.
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26 *
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27 * Note that, by default, we don't process finalizers. To run finalizers one
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28 * needs to set the property "vm.process_finalizers" to true.
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29 */
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30 public class FinalizerThread extends Thread {
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31
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32 // upon their garbage collection, finalizable objects are added into this list instead
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33 // of being removed by gc().sweep()
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34 private Object[] finalizeQueue;
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35
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36 private Object semaphore;
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37 private boolean done;
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38
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39
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40 private void runAllFinalizers() {
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41 while(!isEmpty()) {
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42 try {
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43 // runFinalizer processes and removes the first element in the list
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44 runFinalizer(finalizeQueue[0]);
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45 } catch (Throwable e) {
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46 // FinalizerThread ignores exceptions thrown by finalizers.
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47 }
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48 }
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49 }
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50
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51 boolean isEmpty() {
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52 return (finalizeQueue.length == 0);
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53 }
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54
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55 // invoke finalize() on the give object
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56 private native void runFinalizer(Object o);
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57
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58 private native void manageState();
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59
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60 private void processFinalizers() {
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61 runAllFinalizers();
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62 manageState();
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63 }
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64
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65 @Override
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66 public void run() {
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67 while (!done){
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68 processFinalizers();
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69 }
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70 }
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71 }