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dl |
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/* |
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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 |
1.20 |
* 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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jsr166 |
1.22 |
import java.util.concurrent.atomic.AtomicLong; |
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1.1 |
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jsr166 |
1.27 |
import junit.framework.Test; |
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import junit.framework.TestSuite; |
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1.3 |
public class AtomicLongTest extends JSR166TestCase { |
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jsr166 |
1.19 |
public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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1.1 |
} |
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public static Test suite() { |
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return new TestSuite(AtomicLongTest.class); |
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} |
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jsr166 |
1.17 |
final long[] VALUES = { |
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Long.MIN_VALUE, |
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Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE, |
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Long.MAX_VALUE, |
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}; |
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1.4 |
/** |
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* constructor initializes to given value |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testConstructor() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(1, ai.get()); |
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1.1 |
} |
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1.4 |
/** |
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* default constructed initializes to zero |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testConstructor2() { |
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1.1 |
AtomicLong ai = new AtomicLong(); |
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jsr166 |
1.23 |
assertEquals(0, ai.get()); |
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1.1 |
} |
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dl |
1.4 |
/** |
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1.5 |
* get returns the last value set |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testGetSet() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(1, ai.get()); |
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jsr166 |
1.16 |
ai.set(2); |
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jsr166 |
1.23 |
assertEquals(2, ai.get()); |
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jsr166 |
1.16 |
ai.set(-3); |
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jsr166 |
1.23 |
assertEquals(-3, ai.get()); |
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1.1 |
} |
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1.10 |
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/** |
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* get returns the last value lazySet in same thread |
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*/ |
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jsr166 |
1.13 |
public void testGetLazySet() { |
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1.10 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(1, ai.get()); |
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jsr166 |
1.16 |
ai.lazySet(2); |
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jsr166 |
1.23 |
assertEquals(2, ai.get()); |
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jsr166 |
1.16 |
ai.lazySet(-3); |
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jsr166 |
1.23 |
assertEquals(-3, ai.get()); |
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1.10 |
} |
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1.4 |
/** |
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1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testCompareAndSet() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertTrue(ai.compareAndSet(1, 2)); |
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assertTrue(ai.compareAndSet(2, -4)); |
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assertEquals(-4, ai.get()); |
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assertFalse(ai.compareAndSet(-5, 7)); |
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assertEquals(-4, ai.get()); |
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assertTrue(ai.compareAndSet(-4, 7)); |
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assertEquals(7, ai.get()); |
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1.1 |
} |
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1.4 |
/** |
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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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jsr166 |
1.14 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
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1.5 |
final AtomicLong ai = new AtomicLong(1); |
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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 (!ai.compareAndSet(2, 3)) |
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Thread.yield(); |
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}}); |
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1.14 |
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t.start(); |
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assertTrue(ai.compareAndSet(1, 2)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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jsr166 |
1.23 |
assertEquals(3, ai.get()); |
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1.5 |
} |
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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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*/ |
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jsr166 |
1.13 |
public void testWeakCompareAndSet() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
while (!ai.weakCompareAndSet(1, 2)); |
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while (!ai.weakCompareAndSet(2, -4)); |
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assertEquals(-4, ai.get()); |
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while (!ai.weakCompareAndSet(-4, 7)); |
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assertEquals(7, ai.get()); |
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1.1 |
} |
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1.4 |
/** |
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1.5 |
* getAndSet returns previous value and sets to given value |
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*/ |
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jsr166 |
1.13 |
public void testGetAndSet() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(1, ai.getAndSet(0)); |
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assertEquals(0, ai.getAndSet(-10)); |
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assertEquals(-10, ai.getAndSet(1)); |
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1.1 |
} |
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1.4 |
/** |
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1.5 |
* getAndAdd returns previous value and adds given value |
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*/ |
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jsr166 |
1.13 |
public void testGetAndAdd() { |
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AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(1, ai.getAndAdd(2)); |
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assertEquals(3, ai.get()); |
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assertEquals(3, ai.getAndAdd(-4)); |
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assertEquals(-1, ai.get()); |
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1.1 |
} |
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dl |
1.4 |
/** |
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1.5 |
* getAndDecrement returns previous value and decrements |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testGetAndDecrement() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(1, ai.getAndDecrement()); |
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assertEquals(0, ai.getAndDecrement()); |
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assertEquals(-1, ai.getAndDecrement()); |
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1.1 |
} |
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dl |
1.4 |
/** |
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1.5 |
* getAndIncrement returns previous value and increments |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testGetAndIncrement() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(1, ai.getAndIncrement()); |
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assertEquals(2, ai.get()); |
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jsr166 |
1.16 |
ai.set(-2); |
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jsr166 |
1.23 |
assertEquals(-2, ai.getAndIncrement()); |
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assertEquals(-1, ai.getAndIncrement()); |
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assertEquals(0, ai.getAndIncrement()); |
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assertEquals(1, ai.get()); |
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1.1 |
} |
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1.4 |
/** |
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1.5 |
* addAndGet adds given value to current, and returns current value |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testAddAndGet() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(3, ai.addAndGet(2)); |
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assertEquals(3, ai.get()); |
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assertEquals(-1, ai.addAndGet(-4)); |
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assertEquals(-1, ai.get()); |
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1.1 |
} |
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1.4 |
/** |
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1.5 |
* decrementAndGet decrements and returns current value |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testDecrementAndGet() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(0, ai.decrementAndGet()); |
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assertEquals(-1, ai.decrementAndGet()); |
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assertEquals(-2, ai.decrementAndGet()); |
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assertEquals(-2, ai.get()); |
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1.1 |
} |
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dl |
1.4 |
/** |
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1.5 |
* incrementAndGet increments and returns current value |
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1.4 |
*/ |
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jsr166 |
1.13 |
public void testIncrementAndGet() { |
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1.1 |
AtomicLong ai = new AtomicLong(1); |
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jsr166 |
1.23 |
assertEquals(2, ai.incrementAndGet()); |
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assertEquals(2, ai.get()); |
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jsr166 |
1.16 |
ai.set(-2); |
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jsr166 |
1.23 |
assertEquals(-1, ai.incrementAndGet()); |
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assertEquals(0, ai.incrementAndGet()); |
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assertEquals(1, ai.incrementAndGet()); |
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assertEquals(1, ai.get()); |
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1.1 |
} |
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dl |
1.4 |
/** |
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1.5 |
* a deserialized serialized atomic holds same value |
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dl |
1.4 |
*/ |
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jsr166 |
1.14 |
public void testSerialization() throws Exception { |
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jsr166 |
1.22 |
AtomicLong x = new AtomicLong(); |
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AtomicLong y = serialClone(x); |
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jsr166 |
1.26 |
assertNotSame(x, y); |
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jsr166 |
1.22 |
x.set(-22); |
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AtomicLong z = serialClone(x); |
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jsr166 |
1.26 |
assertNotSame(y, z); |
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jsr166 |
1.22 |
assertEquals(-22, x.get()); |
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assertEquals(0, y.get()); |
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assertEquals(-22, z.get()); |
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1.2 |
} |
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dl |
1.1 |
|
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dl |
1.8 |
/** |
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* toString returns current value. |
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jsr166 |
1.11 |
*/ |
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dl |
1.8 |
public void testToString() { |
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AtomicLong ai = new AtomicLong(); |
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jsr166 |
1.17 |
assertEquals("0", ai.toString()); |
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jsr166 |
1.25 |
for (long x : VALUES) { |
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ai.set(x); |
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assertEquals(Long.toString(x), ai.toString()); |
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dl |
1.8 |
} |
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} |
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dl |
1.9 |
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/** |
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jsr166 |
1.17 |
* intValue returns current value. |
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*/ |
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public void testIntValue() { |
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AtomicLong ai = new AtomicLong(); |
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assertEquals(0, ai.intValue()); |
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for (long x : VALUES) { |
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ai.set(x); |
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assertEquals((int)x, ai.intValue()); |
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} |
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} |
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/** |
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dl |
1.9 |
* longValue returns current value. |
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jsr166 |
1.11 |
*/ |
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dl |
1.9 |
public void testLongValue() { |
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AtomicLong ai = new AtomicLong(); |
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jsr166 |
1.17 |
assertEquals(0L, ai.longValue()); |
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for (long x : VALUES) { |
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ai.set(x); |
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jsr166 |
1.21 |
assertEquals(x, ai.longValue()); |
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dl |
1.9 |
} |
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} |
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/** |
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* floatValue returns current value. |
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jsr166 |
1.11 |
*/ |
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dl |
1.9 |
public void testFloatValue() { |
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AtomicLong ai = new AtomicLong(); |
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jsr166 |
1.17 |
assertEquals(0.0f, ai.floatValue()); |
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for (long x : VALUES) { |
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ai.set(x); |
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assertEquals((float)x, ai.floatValue()); |
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dl |
1.9 |
} |
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} |
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/** |
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* doubleValue returns current value. |
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jsr166 |
1.11 |
*/ |
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dl |
1.9 |
public void testDoubleValue() { |
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AtomicLong ai = new AtomicLong(); |
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jsr166 |
1.17 |
assertEquals(0.0d, ai.doubleValue()); |
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for (long x : VALUES) { |
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ai.set(x); |
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assertEquals((double)x, ai.doubleValue()); |
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dl |
1.9 |
} |
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} |
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dl |
1.1 |
} |