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/*
* 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.
*/
package jsr166;
import java.util.concurrent.atomic.AtomicMarkableReference;
import junit.framework.Test;
import junit.framework.TestSuite;
public class AtomicMarkableReferenceTest extends JSR166TestCase {
// android-note: Removed because the CTS runner does a bad job of
// retrying tests that have suite() declarations.
//
// public static void main(String[] args) {
// main(suite(), args);
// }
// public static Test suite() {
// return new TestSuite(...);
// }
/**
* 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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