Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/PriorityRunnablesSyncPolicy.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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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12 * Unless required by applicable law or agreed to in writing, software
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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
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19 package gov.nasa.jpf.vm;
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20
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21 import gov.nasa.jpf.Config;
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22
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23 /**
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24 * a AllRunnablesSyncPolicy that only considers the runnables with the highest
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25 * priority as choices
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26 *
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27 * 2do - it doesn't make much sense to compare priorities across process
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28 * boundaries (unless we model distributed apps running on the same machine)
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29 */
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30 public class PriorityRunnablesSyncPolicy extends AllRunnablesSyncPolicy {
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31
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32 public PriorityRunnablesSyncPolicy(Config config) {
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33 super(config);
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34 }
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35
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36 @Override
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37 protected ThreadInfo[] getTimeoutRunnables (ApplicationContext appCtx){
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38 ThreadInfo[] allRunnables = super.getTimeoutRunnables(appCtx);
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39
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40 int maxPrio = Integer.MIN_VALUE;
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41 int n=0;
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42 for (int i=0; i<allRunnables.length; i++){
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43 ThreadInfo ti = allRunnables[i];
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44 if (ti != null){
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45 int prio = ti.getPriority();
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46
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47 if (prio > maxPrio){
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48 maxPrio = prio;
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49 for (int j=0; j<i; j++){
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50 allRunnables[j]= null;
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51 }
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52 n = 1;
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53
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54 } else if (prio < maxPrio){
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55 allRunnables[i] = null;
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56
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57 } else { // prio == maxPrio
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58 n++;
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59 }
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60 }
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61 }
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62
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63 if (n < allRunnables.length){
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64 ThreadInfo[] prioRunnables = new ThreadInfo[n];
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65 for (int i=0, j=0; j<n; j++, i++){
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66 if (allRunnables[i] != null){
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67 prioRunnables[j++] = allRunnables[i];
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68 }
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69 }
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70
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71 return prioRunnables;
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72
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73 } else { // all runnables had the same prio
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74 return allRunnables;
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75 }
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76 }
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77 }