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dl |
1.1 |
/* |
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1.6 |
* 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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jsr166 |
1.21 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
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jsr166 |
1.11 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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dl |
1.1 |
*/ |
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import junit.framework.*; |
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jsr166 |
1.23 |
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater; |
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1.1 |
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jsr166 |
1.13 |
public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase { |
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dl |
1.1 |
volatile Integer x = null; |
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Object z; |
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Integer w; |
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jsr166 |
1.13 |
public static void main(String[] args) { |
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1.1 |
junit.textui.TestRunner.run(suite()); |
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} |
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public static Test suite() { |
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return new TestSuite(AtomicReferenceFieldUpdaterTest.class); |
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} |
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jsr166 |
1.26 |
AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) { |
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return AtomicReferenceFieldUpdater.newUpdater |
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(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName); |
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} |
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dl |
1.3 |
/** |
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1.7 |
* Construction with non-existent field throws RuntimeException |
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1.3 |
*/ |
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jsr166 |
1.13 |
public void testConstructor() { |
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jsr166 |
1.12 |
try { |
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jsr166 |
1.26 |
updaterFor("y"); |
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1.3 |
shouldThrow(); |
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jsr166 |
1.17 |
} catch (RuntimeException success) {} |
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1.1 |
} |
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dl |
1.3 |
/** |
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1.4 |
* construction with field not of given type throws RuntimeException |
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1.3 |
*/ |
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jsr166 |
1.13 |
public void testConstructor2() { |
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jsr166 |
1.12 |
try { |
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jsr166 |
1.26 |
updaterFor("z"); |
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1.3 |
shouldThrow(); |
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jsr166 |
1.17 |
} catch (RuntimeException success) {} |
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1.1 |
} |
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dl |
1.3 |
/** |
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1.4 |
* Constructor with non-volatile field throws exception |
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dl |
1.3 |
*/ |
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jsr166 |
1.13 |
public void testConstructor3() { |
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jsr166 |
1.12 |
try { |
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jsr166 |
1.26 |
updaterFor("w"); |
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1.3 |
shouldThrow(); |
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jsr166 |
1.17 |
} catch (RuntimeException success) {} |
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dl |
1.1 |
} |
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dl |
1.3 |
/** |
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jsr166 |
1.20 |
* get returns the last value set or assigned |
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dl |
1.3 |
*/ |
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jsr166 |
1.13 |
public void testGetSet() { |
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dl |
1.8 |
AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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jsr166 |
1.26 |
a = updaterFor("x"); |
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dl |
1.1 |
x = one; |
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jsr166 |
1.24 |
assertSame(one, a.get(this)); |
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a.set(this, two); |
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assertSame(two, a.get(this)); |
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a.set(this, m3); |
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assertSame(m3, a.get(this)); |
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dl |
1.1 |
} |
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dl |
1.10 |
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/** |
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jsr166 |
1.20 |
* get returns the last value lazySet by same thread |
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dl |
1.10 |
*/ |
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jsr166 |
1.13 |
public void testGetLazySet() { |
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dl |
1.10 |
AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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jsr166 |
1.26 |
a = updaterFor("x"); |
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1.10 |
x = one; |
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jsr166 |
1.24 |
assertSame(one, a.get(this)); |
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a.lazySet(this, two); |
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assertSame(two, a.get(this)); |
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a.lazySet(this, m3); |
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assertSame(m3, a.get(this)); |
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1.10 |
} |
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dl |
1.3 |
/** |
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1.4 |
* compareAndSet succeeds in changing value if equal to expected else fails |
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dl |
1.3 |
*/ |
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jsr166 |
1.13 |
public void testCompareAndSet() { |
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dl |
1.8 |
AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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jsr166 |
1.26 |
a = updaterFor("x"); |
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1.1 |
x = one; |
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jsr166 |
1.19 |
assertTrue(a.compareAndSet(this, one, two)); |
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assertTrue(a.compareAndSet(this, two, m4)); |
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assertSame(m4, a.get(this)); |
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assertFalse(a.compareAndSet(this, m5, seven)); |
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jsr166 |
1.18 |
assertFalse(seven == a.get(this)); |
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jsr166 |
1.19 |
assertTrue(a.compareAndSet(this, m4, seven)); |
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jsr166 |
1.24 |
assertSame(seven, a.get(this)); |
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dl |
1.1 |
} |
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dl |
1.3 |
/** |
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1.4 |
* compareAndSet in one thread enables another waiting for value |
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* to succeed |
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*/ |
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jsr166 |
1.14 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
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1.4 |
x = one; |
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dl |
1.8 |
final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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jsr166 |
1.26 |
a = updaterFor("x"); |
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1.4 |
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jsr166 |
1.15 |
Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) |
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Thread.yield(); |
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}}); |
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jsr166 |
1.14 |
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t.start(); |
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assertTrue(a.compareAndSet(this, one, two)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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jsr166 |
1.25 |
assertSame(three, a.get(this)); |
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dl |
1.4 |
} |
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/** |
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* repeated weakCompareAndSet succeeds in changing value when equal |
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jsr166 |
1.11 |
* to expected |
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dl |
1.3 |
*/ |
129 |
jsr166 |
1.13 |
public void testWeakCompareAndSet() { |
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dl |
1.8 |
AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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jsr166 |
1.26 |
a = updaterFor("x"); |
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dl |
1.1 |
x = one; |
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jsr166 |
1.24 |
while (!a.weakCompareAndSet(this, one, two)); |
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while (!a.weakCompareAndSet(this, two, m4)); |
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assertSame(m4, a.get(this)); |
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while (!a.weakCompareAndSet(this, m4, seven)); |
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assertSame(seven, a.get(this)); |
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dl |
1.1 |
} |
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dl |
1.3 |
/** |
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dl |
1.4 |
* getAndSet returns previous value and sets to given value |
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dl |
1.3 |
*/ |
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jsr166 |
1.13 |
public void testGetAndSet() { |
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dl |
1.8 |
AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a; |
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jsr166 |
1.26 |
a = updaterFor("x"); |
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dl |
1.1 |
x = one; |
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jsr166 |
1.24 |
assertSame(one, a.getAndSet(this, zero)); |
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assertSame(zero, a.getAndSet(this, m10)); |
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assertSame(m10, a.getAndSet(this, 1)); |
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dl |
1.1 |
} |
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} |