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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import java.util.concurrent.atomic.*; |
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.atomic.AtomicLongFieldUpdater; |
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|
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public class AtomicLongFieldUpdaterTest extends JSR166TestCase { |
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volatile long x = 0; |
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int z; |
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long w; |
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|
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public static void main(String[] args){ |
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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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public static Test suite() { |
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/** |
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* Construction with non-existent field throws RuntimeException |
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*/ |
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public void testConstructor(){ |
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try{ |
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public void testConstructor() { |
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try { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
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a = AtomicLongFieldUpdater.newUpdater |
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(AtomicLongFieldUpdaterTest.class, "y"); |
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shouldThrow(); |
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} |
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catch (RuntimeException rt) {} |
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} catch (RuntimeException success) {} |
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} |
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|
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/** |
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* construction with field not of given type throws RuntimeException |
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*/ |
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public void testConstructor2(){ |
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try{ |
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public void testConstructor2() { |
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try { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
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a = AtomicLongFieldUpdater.newUpdater |
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(AtomicLongFieldUpdaterTest.class, "z"); |
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shouldThrow(); |
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} |
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catch (RuntimeException rt) {} |
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} catch (RuntimeException success) {} |
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} |
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|
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/** |
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* construction with non-volatile field throws RuntimeException |
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*/ |
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public void testConstructor3(){ |
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try{ |
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public void testConstructor3() { |
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try { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
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a = AtomicLongFieldUpdater.newUpdater |
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(AtomicLongFieldUpdaterTest.class, "w"); |
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shouldThrow(); |
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} |
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|
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catch (RuntimeException rt) {} |
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} catch (RuntimeException success) {} |
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} |
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|
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/** |
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* get returns the last value set or assigned |
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* get returns the last value set or assigned |
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*/ |
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public void testGetSet(){ |
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public void testGetSet() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertEquals(1,a.get(this)); |
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a.set(this,2); |
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assertEquals(2,a.get(this)); |
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a.set(this,-3); |
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assertEquals(-3,a.get(this)); |
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assertEquals(1, a.get(this)); |
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a.set(this, 2); |
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assertEquals(2, a.get(this)); |
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a.set(this, -3); |
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assertEquals(-3, a.get(this)); |
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} |
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|
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/** |
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* get returns the last value lazySet by same thread |
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* get returns the last value lazySet by same thread |
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*/ |
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public void testGetLazySet(){ |
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public void testGetLazySet() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertEquals(1,a.get(this)); |
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a.lazySet(this,2); |
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assertEquals(2,a.get(this)); |
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a.lazySet(this,-3); |
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assertEquals(-3,a.get(this)); |
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assertEquals(1, a.get(this)); |
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a.lazySet(this, 2); |
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assertEquals(2, a.get(this)); |
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a.lazySet(this, -3); |
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assertEquals(-3, a.get(this)); |
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} |
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|
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|
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/** |
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* compareAndSet succeeds in changing value if equal to expected else fails |
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*/ |
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public void testCompareAndSet(){ |
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public void testCompareAndSet() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertTrue(a.compareAndSet(this,1,2)); |
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assertTrue(a.compareAndSet(this,2,-4)); |
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assertEquals(-4,a.get(this)); |
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assertFalse(a.compareAndSet(this,-5,7)); |
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assertFalse((7 == a.get(this))); |
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assertTrue(a.compareAndSet(this,-4,7)); |
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assertEquals(7,a.get(this)); |
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assertTrue(a.compareAndSet(this, 1, 2)); |
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assertTrue(a.compareAndSet(this, 2, -4)); |
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assertEquals(-4, a.get(this)); |
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assertFalse(a.compareAndSet(this, -5, 7)); |
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assertEquals(-4, a.get(this)); |
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assertTrue(a.compareAndSet(this, -4, 7)); |
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assertEquals(7, a.get(this)); |
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} |
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|
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/** |
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* compareAndSet in one thread enables another waiting for 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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x = 1; |
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final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a; |
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try { |
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return; |
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} |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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while(!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) Thread.yield(); |
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}}); |
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try { |
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t.start(); |
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assertTrue(a.compareAndSet(this, 1, 2)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(a.get(this), 3); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
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} |
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Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) |
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Thread.yield(); |
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}}); |
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|
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t.start(); |
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assertTrue(a.compareAndSet(this, 1, 2)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(3, a.get(this)); |
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} |
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|
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/** |
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* repeated weakCompareAndSet succeeds in changing value 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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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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while(!a.weakCompareAndSet(this,1,2)); |
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while(!a.weakCompareAndSet(this,2,-4)); |
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assertEquals(-4,a.get(this)); |
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while(!a.weakCompareAndSet(this,-4,7)); |
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assertEquals(7,a.get(this)); |
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while (!a.weakCompareAndSet(this, 1, 2)); |
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while (!a.weakCompareAndSet(this, 2, -4)); |
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assertEquals(-4, a.get(this)); |
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while (!a.weakCompareAndSet(this, -4, 7)); |
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assertEquals(7, a.get(this)); |
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} |
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|
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/** |
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* getAndSet returns previous value and sets to given value |
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* getAndSet returns previous value and sets to given value |
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*/ |
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public void testGetAndSet(){ |
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public void testGetAndSet() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertEquals(1,a.getAndSet(this, 0)); |
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assertEquals(0,a.getAndSet(this,-10)); |
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assertEquals(-10,a.getAndSet(this,1)); |
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assertEquals(1, a.getAndSet(this, 0)); |
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assertEquals(0, a.getAndSet(this, -10)); |
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assertEquals(-10, a.getAndSet(this, 1)); |
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} |
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|
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/** |
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* getAndAdd returns previous value and adds given value |
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*/ |
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public void testGetAndAdd(){ |
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public void testGetAndAdd() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertEquals(1,a.getAndAdd(this,2)); |
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assertEquals(3,a.get(this)); |
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assertEquals(3,a.getAndAdd(this,-4)); |
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assertEquals(-1,a.get(this)); |
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assertEquals(1, a.getAndAdd(this, 2)); |
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assertEquals(3, a.get(this)); |
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assertEquals(3, a.getAndAdd(this, -4)); |
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assertEquals(-1, a.get(this)); |
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} |
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|
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/** |
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* getAndDecrement returns previous value and decrements |
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*/ |
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public void testGetAndDecrement(){ |
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public void testGetAndDecrement() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertEquals(1,a.getAndDecrement(this)); |
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assertEquals(0,a.getAndDecrement(this)); |
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assertEquals(-1,a.getAndDecrement(this)); |
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assertEquals(1, a.getAndDecrement(this)); |
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assertEquals(0, a.getAndDecrement(this)); |
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> |
assertEquals(-1, a.getAndDecrement(this)); |
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} |
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|
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/** |
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* getAndIncrement returns previous value and increments |
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*/ |
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public void testGetAndIncrement(){ |
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> |
public void testGetAndIncrement() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
215 |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertEquals(1,a.getAndIncrement(this)); |
222 |
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assertEquals(2,a.get(this)); |
223 |
< |
a.set(this,-2); |
224 |
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assertEquals(-2,a.getAndIncrement(this)); |
225 |
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assertEquals(-1,a.getAndIncrement(this)); |
226 |
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assertEquals(0,a.getAndIncrement(this)); |
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assertEquals(1,a.get(this)); |
221 |
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assertEquals(1, a.getAndIncrement(this)); |
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> |
assertEquals(2, a.get(this)); |
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a.set(this, -2); |
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> |
assertEquals(-2, a.getAndIncrement(this)); |
225 |
> |
assertEquals(-1, a.getAndIncrement(this)); |
226 |
> |
assertEquals(0, a.getAndIncrement(this)); |
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> |
assertEquals(1, a.get(this)); |
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} |
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|
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/** |
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* addAndGet adds given value to current, and returns current value |
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*/ |
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< |
public void testAddAndGet(){ |
233 |
> |
public void testAddAndGet() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
235 |
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try { |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
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return; |
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} |
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x = 1; |
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assertEquals(3,a.addAndGet(this,2)); |
242 |
< |
assertEquals(3,a.get(this)); |
243 |
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assertEquals(-1,a.addAndGet(this,-4)); |
244 |
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assertEquals(-1,a.get(this)); |
241 |
> |
assertEquals(3, a.addAndGet(this, 2)); |
242 |
> |
assertEquals(3, a.get(this)); |
243 |
> |
assertEquals(-1, a.addAndGet(this, -4)); |
244 |
> |
assertEquals(-1, a.get(this)); |
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} |
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|
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/** |
248 |
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* decrementAndGet decrements and returns current value |
248 |
> |
* decrementAndGet decrements and returns current value |
249 |
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*/ |
250 |
< |
public void testDecrementAndGet(){ |
250 |
> |
public void testDecrementAndGet() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
252 |
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try { |
253 |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
255 |
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return; |
256 |
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} |
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x = 1; |
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< |
assertEquals(0,a.decrementAndGet(this)); |
259 |
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assertEquals(-1,a.decrementAndGet(this)); |
260 |
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assertEquals(-2,a.decrementAndGet(this)); |
261 |
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assertEquals(-2,a.get(this)); |
258 |
> |
assertEquals(0, a.decrementAndGet(this)); |
259 |
> |
assertEquals(-1, a.decrementAndGet(this)); |
260 |
> |
assertEquals(-2, a.decrementAndGet(this)); |
261 |
> |
assertEquals(-2, a.get(this)); |
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} |
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|
264 |
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/** |
265 |
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* incrementAndGet increments and returns current value |
266 |
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*/ |
267 |
< |
public void testIncrementAndGet(){ |
267 |
> |
public void testIncrementAndGet() { |
268 |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
269 |
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try { |
270 |
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a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
272 |
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return; |
273 |
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} |
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x = 1; |
275 |
< |
assertEquals(2,a.incrementAndGet(this)); |
276 |
< |
assertEquals(2,a.get(this)); |
277 |
< |
a.set(this,-2); |
278 |
< |
assertEquals(-1,a.incrementAndGet(this)); |
279 |
< |
assertEquals(0,a.incrementAndGet(this)); |
280 |
< |
assertEquals(1,a.incrementAndGet(this)); |
281 |
< |
assertEquals(1,a.get(this)); |
275 |
> |
assertEquals(2, a.incrementAndGet(this)); |
276 |
> |
assertEquals(2, a.get(this)); |
277 |
> |
a.set(this, -2); |
278 |
> |
assertEquals(-1, a.incrementAndGet(this)); |
279 |
> |
assertEquals(0, a.incrementAndGet(this)); |
280 |
> |
assertEquals(1, a.incrementAndGet(this)); |
281 |
> |
assertEquals(1, a.get(this)); |
282 |
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} |
283 |
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|
284 |
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} |