/******************************************************************************
* 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 19 from
* http://www.cs.umd.edu/~pugh/java/memoryModel/CausalityTestCases.html
*
* <pre>
* Initially, x = y = 0
*
* Thread 1:
* join thread 3
* r1 = x
* y = r1
*
* Thread 2:
* r2 = y
* x = r2
*
* Thread 3:
* r3 = x
* if (r3 != 42)
* x = 42
*
* Behavior in question: r1 == r2 == r3 == 42
*
* Decision: Allowed. This is the same as test case 17, except that thread 1 has been
* split into two threads.
* </pre>
*
* @threadOrder thread3->thread1
* @author etorlak
*/
public final class Test19 {
static int x = 0, y = 0;
public static final void thread1() {
final int r1 = x;
y = r1;
assert r1==42;
}
public static final void thread2() {
final int r2 = y;
x = r2;
assert r2==42;
}
public static final void thread3() {
final int r3 = x;
if (r3 != 42)
x = 42;
assert r3==42;
}
}