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comparison src/tests/gov/nasa/jpf/test/mc/threads/HORaceTest.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
19 package gov.nasa.jpf.test.mc.threads;
20
21 import gov.nasa.jpf.util.test.TestJPF;
22
23 import org.junit.Test;
24
25 /**
26 * high order data race
27 */
28 public class HORaceTest extends TestJPF {
29
30 static class D {
31 int a;
32 int b;
33
34 D (int x, int y){
35 a = x;
36 b = y;
37 }
38
39 D (D other){
40 setA( other.getA());
41 Thread.yield(); // give the 2nd thread a chance to interfere
42 setB( other.getB());
43 }
44
45 synchronized int getA() { return a; }
46 synchronized int getB() { return b; }
47 synchronized void setA(int x){ a = x; }
48 synchronized void setB(int x){ b = x; }
49
50 synchronized void change(int delta) {
51 a += delta;
52 b += delta;
53 }
54
55 synchronized boolean isConsistent() {
56 return a == b;
57 }
58 }
59
60 static D d1;
61 static D d2;
62
63 @Test
64 public void testHighOrderRace() {
65
66 if (verifyAssertionErrorDetails("inconsistent d2")) {
67 d1 = new D(42, 42);
68
69 Thread t1 = new Thread() {
70
71 @Override
72 public void run() {
73 d2 = new D(d1);
74 }
75 };
76 Thread t2 = new Thread() {
77
78 @Override
79 public void run() {
80 d1.change(-1);
81 }
82 };
83
84 t1.start();
85 t2.start();
86
87 try {
88 t1.join();
89 t2.join();
90 } catch (InterruptedException ix) {
91 fail("unexpected interrupt during {t1,t2}.join()");
92 }
93
94 System.out.print("d2 = ");
95 System.out.print(d2.a);
96 System.out.print(',');
97 System.out.println(d2.b);
98
99 assert d2.isConsistent() : "inconsistent d2";
100 }
101 }
102
103 }