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import junit.framework.*; |
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import java.util.concurrent.atomic.*; |
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public class AtomicMarkableReferenceTest extends JSR166TestCase{ |
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public class AtomicMarkableReferenceTest extends JSR166TestCase { |
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public static void main (String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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} |
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/** |
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* constructor initializes to given reference and mark |
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*/ |
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public void testConstructor(){ |
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public void testConstructor() { |
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
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assertEquals(one,ai.getReference()); |
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assertFalse(ai.isMarked()); |
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/** |
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* get returns the last values of reference and mark set |
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*/ |
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public void testGetSet(){ |
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public void testGetSet() { |
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boolean[] mark = new boolean[1]; |
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
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assertEquals(one,ai.getReference()); |
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/** |
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* attemptMark succeeds in single thread |
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*/ |
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public void testAttemptMark(){ |
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public void testAttemptMark() { |
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boolean[] mark = new boolean[1]; |
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
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assertFalse(ai.isMarked()); |
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* compareAndSet succeeds in changing values if equal to expected reference |
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* and mark else fails |
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*/ |
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public void testCompareAndSet(){ |
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public void testCompareAndSet() { |
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boolean[] mark = new boolean[1]; |
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
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assertEquals(one, ai.get(mark)); |
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* compareAndSet in one thread enables another waiting for reference value |
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* to succeed |
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*/ |
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public void testCompareAndSetInMultipleThreads() { |
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public void testCompareAndSetInMultipleThreads() throws Exception { |
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final AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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while(!ai.compareAndSet(two, three, false, false)) Thread.yield(); |
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while (!ai.compareAndSet(two, three, false, false)) Thread.yield(); |
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}}); |
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try { |
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t.start(); |
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assertTrue(ai.compareAndSet(one, two, false, false)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(ai.getReference(), three); |
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assertFalse(ai.isMarked()); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
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} |
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t.start(); |
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assertTrue(ai.compareAndSet(one, two, false, false)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(ai.getReference(), three); |
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assertFalse(ai.isMarked()); |
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} |
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/** |
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* compareAndSet in one thread enables another waiting for mark value |
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* to succeed |
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*/ |
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public void testCompareAndSetInMultipleThreads2() { |
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public void testCompareAndSetInMultipleThreads2() throws Exception { |
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final AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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while(!ai.compareAndSet(one, one, true, false)) Thread.yield(); |
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while (!ai.compareAndSet(one, one, true, false)) Thread.yield(); |
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}}); |
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try { |
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t.start(); |
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assertTrue(ai.compareAndSet(one, one, false, true)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(ai.getReference(), one); |
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assertFalse(ai.isMarked()); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
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} |
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t.start(); |
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assertTrue(ai.compareAndSet(one, one, false, true)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(ai.getReference(), one); |
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assertFalse(ai.isMarked()); |
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} |
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/** |
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* repeated weakCompareAndSet succeeds in changing values when equal |
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* to expected |
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*/ |
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public void testWeakCompareAndSet(){ |
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public void testWeakCompareAndSet() { |
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boolean[] mark = new boolean[1]; |
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
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assertEquals(one, ai.get(mark)); |
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assertFalse(ai.isMarked()); |
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assertFalse(mark[0]); |
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while(!ai.weakCompareAndSet(one, two, false, false)); |
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while (!ai.weakCompareAndSet(one, two, false, false)); |
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assertEquals(two, ai.get(mark)); |
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assertFalse(mark[0]); |
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while(!ai.weakCompareAndSet(two, m3, false, true)); |
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while (!ai.weakCompareAndSet(two, m3, false, true)); |
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assertEquals(m3, ai.get(mark)); |
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assertTrue(mark[0]); |
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} |