Mercurial > hg > Members > kono > jpf-core
view src/tests/gov/nasa/jpf/test/mc/threads/HORaceTest.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.test.mc.threads; import gov.nasa.jpf.util.test.TestJPF; import org.junit.Test; /** * high order data race */ public class HORaceTest extends TestJPF { static class D { int a; int b; D (int x, int y){ a = x; b = y; } D (D other){ setA( other.getA()); Thread.yield(); // give the 2nd thread a chance to interfere setB( other.getB()); } synchronized int getA() { return a; } synchronized int getB() { return b; } synchronized void setA(int x){ a = x; } synchronized void setB(int x){ b = x; } synchronized void change(int delta) { a += delta; b += delta; } synchronized boolean isConsistent() { return a == b; } } static D d1; static D d2; @Test public void testHighOrderRace() { if (verifyAssertionErrorDetails("inconsistent d2")) { d1 = new D(42, 42); Thread t1 = new Thread() { @Override public void run() { d2 = new D(d1); } }; Thread t2 = new Thread() { @Override public void run() { d1.change(-1); } }; t1.start(); t2.start(); try { t1.join(); t2.join(); } catch (InterruptedException ix) { fail("unexpected interrupt during {t1,t2}.join()"); } System.out.print("d2 = "); System.out.print(d2.a); System.out.print(','); System.out.println(d2.b); assert d2.isConsistent() : "inconsistent d2"; } } }