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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
* Other contributors include Andrew Wright, Jeffrey Hayes,
* Pat Fisher, Mike Judd.
*/
import java.util.concurrent.atomic.AtomicMarkableReference;
import junit.framework.Test;
import junit.framework.TestSuite;
public class AtomicMarkableReferenceTest extends JSR166TestCase {
public static void main(String[] args) {
main(suite(), args);
}
public static Test suite() {
return new TestSuite(AtomicMarkableReferenceTest.class);
}
/**
* constructor initializes to given reference and mark
*/
public void testConstructor() {
AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
assertSame(one, ai.getReference());
assertFalse(ai.isMarked());
AtomicMarkableReference a2 = new AtomicMarkableReference(null, true);
assertNull(a2.getReference());
assertTrue(a2.isMarked());
}
/**
* get returns the last values of reference and mark set
*/
public void testGetSet() {
boolean[] mark = new boolean[1];
AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
assertSame(one, ai.getReference());
assertFalse(ai.isMarked());
assertSame(one, ai.get(mark));
assertFalse(mark[0]);
ai.set(two, false);
assertSame(two, ai.getReference());
assertFalse(ai.isMarked());
assertSame(two, ai.get(mark));
assertFalse(mark[0]);
ai.set(one, true);
assertSame(one, ai.getReference());
assertTrue(ai.isMarked());
assertSame(one, ai.get(mark));
assertTrue(mark[0]);
}
/**
* attemptMark succeeds in single thread
*/
public void testAttemptMark() {
boolean[] mark = new boolean[1];
AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
assertFalse(ai.isMarked());
assertTrue(ai.attemptMark(one, true));
assertTrue(ai.isMarked());
assertSame(one, ai.get(mark));
assertTrue(mark[0]);
}
/**
* compareAndSet succeeds in changing values if equal to expected reference
* and mark else fails
*/
public void testCompareAndSet() {
boolean[] mark = new boolean[1];
AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
assertSame(one, ai.get(mark));
assertFalse(ai.isMarked());
assertFalse(mark[0]);
assertTrue(ai.compareAndSet(one, two, false, false));
assertSame(two, ai.get(mark));
assertFalse(mark[0]);
assertTrue(ai.compareAndSet(two, m3, false, true));
assertSame(m3, ai.get(mark));
assertTrue(mark[0]);
assertFalse(ai.compareAndSet(two, m3, true, true));
assertSame(m3, ai.get(mark));
assertTrue(mark[0]);
}
/**
* compareAndSet in one thread enables another waiting for reference value
* to succeed
*/
public void testCompareAndSetInMultipleThreads() throws Exception {
final AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
while (!ai.compareAndSet(two, three, false, false))
Thread.yield();
}});
t.start();
assertTrue(ai.compareAndSet(one, two, false, false));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertSame(three, ai.getReference());
assertFalse(ai.isMarked());
}
/**
* compareAndSet in one thread enables another waiting for mark value
* to succeed
*/
public void testCompareAndSetInMultipleThreads2() throws Exception {
final AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
while (!ai.compareAndSet(one, one, true, false))
Thread.yield();
}});
t.start();
assertTrue(ai.compareAndSet(one, one, false, true));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertSame(one, ai.getReference());
assertFalse(ai.isMarked());
}
/**
* repeated weakCompareAndSet succeeds in changing values when equal
* to expected
*/
public void testWeakCompareAndSet() {
boolean[] mark = new boolean[1];
AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
assertSame(one, ai.get(mark));
assertFalse(ai.isMarked());
assertFalse(mark[0]);
do {} while (!ai.weakCompareAndSet(one, two, false, false));
assertSame(two, ai.get(mark));
assertFalse(mark[0]);
do {} while (!ai.weakCompareAndSet(two, m3, false, true));
assertSame(m3, ai.get(mark));
assertTrue(mark[0]);
}
}
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