Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/vm/ThresholdFieldLockInfo.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 /*
2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
4 * All rights reserved.
5 *
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0.
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package gov.nasa.jpf.vm;
19
20 import gov.nasa.jpf.JPFException;
21
22 /**
23 * a FieldLockInfo that assumes lock protection after n accesses with
24 * non-empty lock sets
25 */
26 public abstract class ThresholdFieldLockInfo extends FieldLockInfo implements Cloneable {
27 protected int remainingChecks;
28
29 protected ThresholdFieldLockInfo(int remainingChecks) {
30 this.remainingChecks = remainingChecks;
31 }
32
33 @Override
34 public boolean isProtected() {
35 // otherwise this would have turned into a EmptyFieldLockInfo
36 return (remainingChecks == 0);
37 }
38
39 protected void checkFailedLockAssumption(ThreadInfo ti, ElementInfo ei, FieldInfo fi) {
40 if (remainingChecks == 0) {
41 // with no locks remaining this would have been demoted to an
42 // EmptyFieldLockInfo by now
43 lockAssumptionFailed(ti, ei, fi);
44 }
45 }
46
47 /**
48 * this implements a path-local FieldLockInfo that are never mutated
49 * this has to be overridden for search global FieldLockInfos
50 */
51 protected FieldLockInfo getInstance (int nRemaining){
52 try {
53 ThresholdFieldLockInfo fli = (ThresholdFieldLockInfo)clone();
54 fli.remainingChecks = nRemaining;
55 return fli;
56
57 } catch (CloneNotSupportedException cnsx){
58 throw new JPFException("clone of ThresholdFieldLockInfo failed: " + this);
59 }
60 }
61 }