Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/vm/ThresholdFieldLockInfo.java @ 0:61d41facf527
initial v8 import (history reset)
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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/* * Copyright (C) 2014, United States Government, as represented by the * Administrator of the National Aeronautics and Space Administration. * All rights reserved. * * The Java Pathfinder core (jpf-core) platform is licensed under the * Apache License, Version 2.0 (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0. * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package gov.nasa.jpf.vm; import gov.nasa.jpf.JPFException; /** * a FieldLockInfo that assumes lock protection after n accesses with * non-empty lock sets */ public abstract class ThresholdFieldLockInfo extends FieldLockInfo implements Cloneable { protected int remainingChecks; protected ThresholdFieldLockInfo(int remainingChecks) { this.remainingChecks = remainingChecks; } @Override public boolean isProtected() { // otherwise this would have turned into a EmptyFieldLockInfo return (remainingChecks == 0); } protected void checkFailedLockAssumption(ThreadInfo ti, ElementInfo ei, FieldInfo fi) { if (remainingChecks == 0) { // with no locks remaining this would have been demoted to an // EmptyFieldLockInfo by now lockAssumptionFailed(ti, ei, fi); } } /** * this implements a path-local FieldLockInfo that are never mutated * this has to be overridden for search global FieldLockInfos */ protected FieldLockInfo getInstance (int nRemaining){ try { ThresholdFieldLockInfo fli = (ThresholdFieldLockInfo)clone(); fli.remainingChecks = nRemaining; return fli; } catch (CloneNotSupportedException cnsx){ throw new JPFException("clone of ThresholdFieldLockInfo failed: " + this); } } }