/******************************************************************************
* Copyright (c) 2009 - 2015 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*****************************************************************************/
/**
*
*/
package data.causality;
/**
* Causality test case 10 from
* http://www.cs.umd.edu/~pugh/java/memoryModel/CausalityTestCases.html
*
* <pre>
* Initially, x = y = z = 0
*
* Thread 1:
* r1 = x
* if (r1 == 1)
* y = 1
*
* Thread 2
* r2 = y
* if (r2 == 1)
* x = 1
*
* Thread 3
* z = 1
*
* Thread 4
* r3 = z
* if (r3 == 1)
* x = 1
*
* Behavior in question: r1 == r2 == 1, r3 == 0.
*
* Decision: Forbidden. This is the same as test case 5, except using control
* dependences rather than data dependences.
* </pre>
*
*
* @author etorlak
*
*/
public final class Test10 {
static int x = 0, y = 0, z = 0;
public static final void thread1() {
final int r1 = x;
if (r1 == 1)
y = 1;
assert r1==1;
}
public static final void thread2() {
final int r2 = y;
if (r2 == 1)
x = 1;
assert r2==1;
}
public static final void thread3() {
z = 1;
}
public static final void thread4() {
final int r3 = z;
if (r3 == 1)
x = 1;
assert r3==0;
}
}