| 1 |
/* |
| 2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 |
* Expert Group and released to the public domain, as explained at |
| 4 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
| 6 |
* Pat Fisher, Mike Judd. |
| 7 |
*/ |
| 8 |
|
| 9 |
import java.util.Arrays; |
| 10 |
import java.util.concurrent.atomic.AtomicLongArray; |
| 11 |
|
| 12 |
import junit.framework.Test; |
| 13 |
import junit.framework.TestSuite; |
| 14 |
|
| 15 |
public class AtomicLongArrayTest extends JSR166TestCase { |
| 16 |
public static void main(String[] args) { |
| 17 |
main(suite(), args); |
| 18 |
} |
| 19 |
public static Test suite() { |
| 20 |
return new TestSuite(AtomicLongArrayTest.class); |
| 21 |
} |
| 22 |
|
| 23 |
/** |
| 24 |
* constructor creates array of given size with all elements zero |
| 25 |
*/ |
| 26 |
public void testConstructor() { |
| 27 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 28 |
for (int i = 0; i < SIZE; i++) |
| 29 |
assertEquals(0, aa.get(i)); |
| 30 |
} |
| 31 |
|
| 32 |
/** |
| 33 |
* constructor with null array throws NPE |
| 34 |
*/ |
| 35 |
public void testConstructor2NPE() { |
| 36 |
try { |
| 37 |
long[] a = null; |
| 38 |
new AtomicLongArray(a); |
| 39 |
shouldThrow(); |
| 40 |
} catch (NullPointerException success) {} |
| 41 |
} |
| 42 |
|
| 43 |
/** |
| 44 |
* constructor with array is of same size and has all elements |
| 45 |
*/ |
| 46 |
public void testConstructor2() { |
| 47 |
long[] a = { 17L, 3L, -42L, 99L, -7L }; |
| 48 |
AtomicLongArray aa = new AtomicLongArray(a); |
| 49 |
assertEquals(a.length, aa.length()); |
| 50 |
for (int i = 0; i < a.length; i++) |
| 51 |
assertEquals(a[i], aa.get(i)); |
| 52 |
} |
| 53 |
|
| 54 |
/** |
| 55 |
* get and set for out of bound indices throw IndexOutOfBoundsException |
| 56 |
*/ |
| 57 |
public void testIndexing() { |
| 58 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 59 |
for (int index : new int[] { -1, SIZE }) { |
| 60 |
try { |
| 61 |
aa.get(index); |
| 62 |
shouldThrow(); |
| 63 |
} catch (IndexOutOfBoundsException success) {} |
| 64 |
try { |
| 65 |
aa.set(index, 1); |
| 66 |
shouldThrow(); |
| 67 |
} catch (IndexOutOfBoundsException success) {} |
| 68 |
try { |
| 69 |
aa.lazySet(index, 1); |
| 70 |
shouldThrow(); |
| 71 |
} catch (IndexOutOfBoundsException success) {} |
| 72 |
try { |
| 73 |
aa.compareAndSet(index, 1, 2); |
| 74 |
shouldThrow(); |
| 75 |
} catch (IndexOutOfBoundsException success) {} |
| 76 |
try { |
| 77 |
aa.weakCompareAndSet(index, 1, 2); |
| 78 |
shouldThrow(); |
| 79 |
} catch (IndexOutOfBoundsException success) {} |
| 80 |
try { |
| 81 |
aa.getAndAdd(index, 1); |
| 82 |
shouldThrow(); |
| 83 |
} catch (IndexOutOfBoundsException success) {} |
| 84 |
try { |
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aa.addAndGet(index, 1); |
| 86 |
shouldThrow(); |
| 87 |
} catch (IndexOutOfBoundsException success) {} |
| 88 |
try { |
| 89 |
aa.getPlain(index); |
| 90 |
shouldThrow(); |
| 91 |
} catch (IndexOutOfBoundsException success) {} |
| 92 |
try { |
| 93 |
aa.getOpaque(index); |
| 94 |
shouldThrow(); |
| 95 |
} catch (IndexOutOfBoundsException success) {} |
| 96 |
try { |
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aa.getAcquire(index); |
| 98 |
shouldThrow(); |
| 99 |
} catch (IndexOutOfBoundsException success) {} |
| 100 |
try { |
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aa.setPlain(index, 1); |
| 102 |
shouldThrow(); |
| 103 |
} catch (IndexOutOfBoundsException success) {} |
| 104 |
try { |
| 105 |
aa.setOpaque(index, 1); |
| 106 |
shouldThrow(); |
| 107 |
} catch (IndexOutOfBoundsException success) {} |
| 108 |
try { |
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aa.setRelease(index, 1); |
| 110 |
shouldThrow(); |
| 111 |
} catch (IndexOutOfBoundsException success) {} |
| 112 |
try { |
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aa.compareAndExchange(index, 1, 2); |
| 114 |
shouldThrow(); |
| 115 |
} catch (IndexOutOfBoundsException success) {} |
| 116 |
try { |
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aa.compareAndExchangeAcquire(index, 1, 2); |
| 118 |
shouldThrow(); |
| 119 |
} catch (IndexOutOfBoundsException success) {} |
| 120 |
try { |
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aa.compareAndExchangeRelease(index, 1, 2); |
| 122 |
shouldThrow(); |
| 123 |
} catch (IndexOutOfBoundsException success) {} |
| 124 |
try { |
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aa.weakCompareAndSetVolatile(index, 1, 2); |
| 126 |
shouldThrow(); |
| 127 |
} catch (IndexOutOfBoundsException success) {} |
| 128 |
try { |
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aa.weakCompareAndSetAcquire(index, 1, 2); |
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shouldThrow(); |
| 131 |
} catch (IndexOutOfBoundsException success) {} |
| 132 |
try { |
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aa.weakCompareAndSetRelease(index, 1, 2); |
| 134 |
shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
| 136 |
} |
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} |
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|
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/** |
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* get returns the last value set at index |
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*/ |
| 142 |
public void testGetSet() { |
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AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 144 |
for (int i = 0; i < SIZE; i++) { |
| 145 |
aa.set(i, 1); |
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assertEquals(1, aa.get(i)); |
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aa.set(i, 2); |
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assertEquals(2, aa.get(i)); |
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aa.set(i, -3); |
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assertEquals(-3, aa.get(i)); |
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} |
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} |
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|
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/** |
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* get returns the last value lazySet at index by same thread |
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*/ |
| 157 |
public void testGetLazySet() { |
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AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 159 |
for (int i = 0; i < SIZE; i++) { |
| 160 |
aa.lazySet(i, 1); |
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assertEquals(1, aa.get(i)); |
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aa.lazySet(i, 2); |
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assertEquals(2, aa.get(i)); |
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aa.lazySet(i, -3); |
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assertEquals(-3, aa.get(i)); |
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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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*/ |
| 172 |
public void testCompareAndSet() { |
| 173 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 174 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertTrue(aa.compareAndSet(i, 1, 2)); |
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assertTrue(aa.compareAndSet(i, 2, -4)); |
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assertEquals(-4, aa.get(i)); |
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assertFalse(aa.compareAndSet(i, -5, 7)); |
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assertEquals(-4, aa.get(i)); |
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assertTrue(aa.compareAndSet(i, -4, 7)); |
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assertEquals(7, aa.get(i)); |
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} |
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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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*/ |
| 190 |
public void testCompareAndSetInMultipleThreads() throws InterruptedException { |
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final AtomicLongArray a = new AtomicLongArray(1); |
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a.set(0, 1); |
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Thread t = new Thread(new CheckedRunnable() { |
| 194 |
public void realRun() { |
| 195 |
while (!a.compareAndSet(0, 2, 3)) |
| 196 |
Thread.yield(); |
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}}); |
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|
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t.start(); |
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assertTrue(a.compareAndSet(0, 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(0)); |
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} |
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|
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/** |
| 207 |
* repeated weakCompareAndSet succeeds in changing value when equal |
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* to expected |
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*/ |
| 210 |
public void testWeakCompareAndSet() { |
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AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 212 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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do {} while (!aa.weakCompareAndSet(i, 1, 2)); |
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do {} while (!aa.weakCompareAndSet(i, 2, -4)); |
| 216 |
assertEquals(-4, aa.get(i)); |
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do {} while (!aa.weakCompareAndSet(i, -4, 7)); |
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assertEquals(7, aa.get(i)); |
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} |
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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 at given index |
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*/ |
| 225 |
public void testGetAndSet() { |
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AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 227 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
| 229 |
assertEquals(1, aa.getAndSet(i, 0)); |
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assertEquals(0, aa.getAndSet(i, -10)); |
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assertEquals(-10, aa.getAndSet(i, 1)); |
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} |
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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() { |
| 239 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 240 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertEquals(1, aa.getAndAdd(i, 2)); |
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assertEquals(3, aa.get(i)); |
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assertEquals(3, aa.getAndAdd(i, -4)); |
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assertEquals(-1, aa.get(i)); |
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} |
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} |
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|
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/** |
| 250 |
* getAndDecrement returns previous value and decrements |
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*/ |
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public void testGetAndDecrement() { |
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AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 254 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertEquals(1, aa.getAndDecrement(i)); |
| 257 |
assertEquals(0, aa.getAndDecrement(i)); |
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assertEquals(-1, aa.getAndDecrement(i)); |
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} |
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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() { |
| 266 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 267 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertEquals(1, aa.getAndIncrement(i)); |
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assertEquals(2, aa.get(i)); |
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aa.set(i, -2); |
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assertEquals(-2, aa.getAndIncrement(i)); |
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assertEquals(-1, aa.getAndIncrement(i)); |
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assertEquals(0, aa.getAndIncrement(i)); |
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assertEquals(1, aa.get(i)); |
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} |
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} |
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|
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/** |
| 280 |
* addAndGet adds given value to current, and returns current value |
| 281 |
*/ |
| 282 |
public void testAddAndGet() { |
| 283 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 284 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertEquals(3, aa.addAndGet(i, 2)); |
| 287 |
assertEquals(3, aa.get(i)); |
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assertEquals(-1, aa.addAndGet(i, -4)); |
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assertEquals(-1, aa.get(i)); |
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} |
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} |
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|
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/** |
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* decrementAndGet decrements and returns current value |
| 295 |
*/ |
| 296 |
public void testDecrementAndGet() { |
| 297 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 298 |
for (int i = 0; i < SIZE; i++) { |
| 299 |
aa.set(i, 1); |
| 300 |
assertEquals(0, aa.decrementAndGet(i)); |
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assertEquals(-1, aa.decrementAndGet(i)); |
| 302 |
assertEquals(-2, aa.decrementAndGet(i)); |
| 303 |
assertEquals(-2, aa.get(i)); |
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} |
| 305 |
} |
| 306 |
|
| 307 |
/** |
| 308 |
* incrementAndGet increments and returns current value |
| 309 |
*/ |
| 310 |
public void testIncrementAndGet() { |
| 311 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 312 |
for (int i = 0; i < SIZE; i++) { |
| 313 |
aa.set(i, 1); |
| 314 |
assertEquals(2, aa.incrementAndGet(i)); |
| 315 |
assertEquals(2, aa.get(i)); |
| 316 |
aa.set(i, -2); |
| 317 |
assertEquals(-1, aa.incrementAndGet(i)); |
| 318 |
assertEquals(0, aa.incrementAndGet(i)); |
| 319 |
assertEquals(1, aa.incrementAndGet(i)); |
| 320 |
assertEquals(1, aa.get(i)); |
| 321 |
} |
| 322 |
} |
| 323 |
|
| 324 |
class Counter extends CheckedRunnable { |
| 325 |
final AtomicLongArray aa; |
| 326 |
volatile long counts; |
| 327 |
Counter(AtomicLongArray a) { aa = a; } |
| 328 |
public void realRun() { |
| 329 |
for (;;) { |
| 330 |
boolean done = true; |
| 331 |
for (int i = 0; i < aa.length(); i++) { |
| 332 |
long v = aa.get(i); |
| 333 |
assertTrue(v >= 0); |
| 334 |
if (v != 0) { |
| 335 |
done = false; |
| 336 |
if (aa.compareAndSet(i, v, v - 1)) |
| 337 |
++counts; |
| 338 |
} |
| 339 |
} |
| 340 |
if (done) |
| 341 |
break; |
| 342 |
} |
| 343 |
} |
| 344 |
} |
| 345 |
|
| 346 |
/** |
| 347 |
* Multiple threads using same array of counters successfully |
| 348 |
* update a number of times equal to total count |
| 349 |
*/ |
| 350 |
public void testCountingInMultipleThreads() throws InterruptedException { |
| 351 |
final AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 352 |
long countdown = 10000; |
| 353 |
for (int i = 0; i < SIZE; i++) |
| 354 |
aa.set(i, countdown); |
| 355 |
Counter c1 = new Counter(aa); |
| 356 |
Counter c2 = new Counter(aa); |
| 357 |
Thread t1 = new Thread(c1); |
| 358 |
Thread t2 = new Thread(c2); |
| 359 |
t1.start(); |
| 360 |
t2.start(); |
| 361 |
t1.join(); |
| 362 |
t2.join(); |
| 363 |
assertEquals(c1.counts+c2.counts, SIZE * countdown); |
| 364 |
} |
| 365 |
|
| 366 |
/** |
| 367 |
* a deserialized serialized array holds same values |
| 368 |
*/ |
| 369 |
public void testSerialization() throws Exception { |
| 370 |
AtomicLongArray x = new AtomicLongArray(SIZE); |
| 371 |
for (int i = 0; i < SIZE; i++) |
| 372 |
x.set(i, -i); |
| 373 |
AtomicLongArray y = serialClone(x); |
| 374 |
assertNotSame(x, y); |
| 375 |
assertEquals(x.length(), y.length()); |
| 376 |
for (int i = 0; i < SIZE; i++) { |
| 377 |
assertEquals(x.get(i), y.get(i)); |
| 378 |
} |
| 379 |
} |
| 380 |
|
| 381 |
/** |
| 382 |
* toString returns current value. |
| 383 |
*/ |
| 384 |
public void testToString() { |
| 385 |
long[] a = { 17, 3, -42, 99, -7 }; |
| 386 |
AtomicLongArray aa = new AtomicLongArray(a); |
| 387 |
assertEquals(Arrays.toString(a), aa.toString()); |
| 388 |
} |
| 389 |
|
| 390 |
// jdk9 |
| 391 |
|
| 392 |
/** |
| 393 |
* getPlain returns the last value set |
| 394 |
*/ |
| 395 |
public void testGetPlainSet() { |
| 396 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 397 |
for (int i = 0; i < SIZE; i++) { |
| 398 |
aa.set(i, 1); |
| 399 |
assertEquals(1, aa.getPlain(i)); |
| 400 |
aa.set(i, 2); |
| 401 |
assertEquals(2, aa.getPlain(i)); |
| 402 |
aa.set(i, -3); |
| 403 |
assertEquals(-3, aa.getPlain(i)); |
| 404 |
} |
| 405 |
} |
| 406 |
|
| 407 |
/** |
| 408 |
* getOpaque returns the last value set |
| 409 |
*/ |
| 410 |
public void testGetOpaqueSet() { |
| 411 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 412 |
for (int i = 0; i < SIZE; i++) { |
| 413 |
aa.set(i, 1); |
| 414 |
assertEquals(1, aa.getOpaque(i)); |
| 415 |
aa.set(i, 2); |
| 416 |
assertEquals(2, aa.getOpaque(i)); |
| 417 |
aa.set(i, -3); |
| 418 |
assertEquals(-3, aa.getOpaque(i)); |
| 419 |
} |
| 420 |
} |
| 421 |
|
| 422 |
/** |
| 423 |
* getAcquire returns the last value set |
| 424 |
*/ |
| 425 |
public void testGetAcquireSet() { |
| 426 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 427 |
for (int i = 0; i < SIZE; i++) { |
| 428 |
aa.set(i, 1); |
| 429 |
assertEquals(1, aa.getAcquire(i)); |
| 430 |
aa.set(i, 2); |
| 431 |
assertEquals(2, aa.getAcquire(i)); |
| 432 |
aa.set(i, -3); |
| 433 |
assertEquals(-3, aa.getAcquire(i)); |
| 434 |
} |
| 435 |
} |
| 436 |
|
| 437 |
/** |
| 438 |
* get returns the last value setPlain |
| 439 |
*/ |
| 440 |
public void testGetSetPlain() { |
| 441 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 442 |
for (int i = 0; i < SIZE; i++) { |
| 443 |
aa.setPlain(i, 1); |
| 444 |
assertEquals(1, aa.get(i)); |
| 445 |
aa.setPlain(i, 2); |
| 446 |
assertEquals(2, aa.get(i)); |
| 447 |
aa.setPlain(i, -3); |
| 448 |
assertEquals(-3, aa.get(i)); |
| 449 |
} |
| 450 |
} |
| 451 |
|
| 452 |
/** |
| 453 |
* get returns the last value setOpaque |
| 454 |
*/ |
| 455 |
public void testGetSetOpaque() { |
| 456 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 457 |
for (int i = 0; i < SIZE; i++) { |
| 458 |
aa.setOpaque(i, 1); |
| 459 |
assertEquals(1, aa.get(i)); |
| 460 |
aa.setOpaque(i, 2); |
| 461 |
assertEquals(2, aa.get(i)); |
| 462 |
aa.setOpaque(i, -3); |
| 463 |
assertEquals(-3, aa.get(i)); |
| 464 |
} |
| 465 |
} |
| 466 |
|
| 467 |
/** |
| 468 |
* get returns the last value setRelease |
| 469 |
*/ |
| 470 |
public void testGetSetRelease() { |
| 471 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 472 |
for (int i = 0; i < SIZE; i++) { |
| 473 |
aa.setRelease(i, 1); |
| 474 |
assertEquals(1, aa.get(i)); |
| 475 |
aa.setRelease(i, 2); |
| 476 |
assertEquals(2, aa.get(i)); |
| 477 |
aa.setRelease(i, -3); |
| 478 |
assertEquals(-3, aa.get(i)); |
| 479 |
} |
| 480 |
} |
| 481 |
|
| 482 |
/** |
| 483 |
* compareAndExchange succeeds in changing value if equal to |
| 484 |
* expected else fails |
| 485 |
*/ |
| 486 |
public void testCompareAndExchange() { |
| 487 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 488 |
for (int i = 0; i < SIZE; i++) { |
| 489 |
aa.set(i, 1); |
| 490 |
assertEquals(1, aa.compareAndExchange(i, 1, 2)); |
| 491 |
assertEquals(2, aa.compareAndExchange(i, 2, -4)); |
| 492 |
assertEquals(-4, aa.get(i)); |
| 493 |
assertEquals(-4, aa.compareAndExchange(i,-5, 7)); |
| 494 |
assertEquals(-4, aa.get(i)); |
| 495 |
assertEquals(-4, aa.compareAndExchange(i, -4, 7)); |
| 496 |
assertEquals(7, aa.get(i)); |
| 497 |
} |
| 498 |
} |
| 499 |
|
| 500 |
/** |
| 501 |
* compareAndExchangeAcquire succeeds in changing value if equal to |
| 502 |
* expected else fails |
| 503 |
*/ |
| 504 |
public void testCompareAndExchangeAcquire() { |
| 505 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 506 |
for (int i = 0; i < SIZE; i++) { |
| 507 |
aa.set(i, 1); |
| 508 |
assertEquals(1, aa.compareAndExchangeAcquire(i, 1, 2)); |
| 509 |
assertEquals(2, aa.compareAndExchangeAcquire(i, 2, -4)); |
| 510 |
assertEquals(-4, aa.get(i)); |
| 511 |
assertEquals(-4, aa.compareAndExchangeAcquire(i,-5, 7)); |
| 512 |
assertEquals(-4, aa.get(i)); |
| 513 |
assertEquals(-4, aa.compareAndExchangeAcquire(i, -4, 7)); |
| 514 |
assertEquals(7, aa.get(i)); |
| 515 |
} |
| 516 |
} |
| 517 |
|
| 518 |
/** |
| 519 |
* compareAndExchangeRelease succeeds in changing value if equal to |
| 520 |
* expected else fails |
| 521 |
*/ |
| 522 |
public void testCompareAndExchangeRelease() { |
| 523 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 524 |
for (int i = 0; i < SIZE; i++) { |
| 525 |
aa.set(i, 1); |
| 526 |
assertEquals(1, aa.compareAndExchangeRelease(i, 1, 2)); |
| 527 |
assertEquals(2, aa.compareAndExchangeRelease(i, 2, -4)); |
| 528 |
assertEquals(-4, aa.get(i)); |
| 529 |
assertEquals(-4, aa.compareAndExchangeRelease(i,-5, 7)); |
| 530 |
assertEquals(-4, aa.get(i)); |
| 531 |
assertEquals(-4, aa.compareAndExchangeRelease(i, -4, 7)); |
| 532 |
assertEquals(7, aa.get(i)); |
| 533 |
} |
| 534 |
} |
| 535 |
|
| 536 |
/** |
| 537 |
* repeated weakCompareAndSetVolatile succeeds in changing value when equal |
| 538 |
* to expected |
| 539 |
*/ |
| 540 |
public void testWeakCompareAndSetVolatile() { |
| 541 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 542 |
for (int i = 0; i < SIZE; i++) { |
| 543 |
aa.set(i, 1); |
| 544 |
do {} while (!aa.weakCompareAndSetVolatile(i, 1, 2)); |
| 545 |
do {} while (!aa.weakCompareAndSetVolatile(i, 2, -4)); |
| 546 |
assertEquals(-4, aa.get(i)); |
| 547 |
do {} while (!aa.weakCompareAndSetVolatile(i, -4, 7)); |
| 548 |
assertEquals(7, aa.get(i)); |
| 549 |
} |
| 550 |
} |
| 551 |
|
| 552 |
/** |
| 553 |
* repeated weakCompareAndSetAcquire succeeds in changing value when equal |
| 554 |
* to expected |
| 555 |
*/ |
| 556 |
public void testWeakCompareAndSetAcquire() { |
| 557 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 558 |
for (int i = 0; i < SIZE; i++) { |
| 559 |
aa.set(i, 1); |
| 560 |
do {} while (!aa.weakCompareAndSetAcquire(i, 1, 2)); |
| 561 |
do {} while (!aa.weakCompareAndSetAcquire(i, 2, -4)); |
| 562 |
assertEquals(-4, aa.get(i)); |
| 563 |
do {} while (!aa.weakCompareAndSetAcquire(i, -4, 7)); |
| 564 |
assertEquals(7, aa.get(i)); |
| 565 |
} |
| 566 |
} |
| 567 |
|
| 568 |
/** |
| 569 |
* repeated weakCompareAndSetRelease succeeds in changing value when equal |
| 570 |
* to expected |
| 571 |
*/ |
| 572 |
public void testWeakCompareAndSetRelease() { |
| 573 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
| 574 |
for (int i = 0; i < SIZE; i++) { |
| 575 |
aa.set(i, 1); |
| 576 |
do {} while (!aa.weakCompareAndSetRelease(i, 1, 2)); |
| 577 |
do {} while (!aa.weakCompareAndSetRelease(i, 2, -4)); |
| 578 |
assertEquals(-4, aa.get(i)); |
| 579 |
do {} while (!aa.weakCompareAndSetRelease(i, -4, 7)); |
| 580 |
assertEquals(7, aa.get(i)); |
| 581 |
} |
| 582 |
} |
| 583 |
|
| 584 |
} |
