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.AtomicIntegerArray; |
11 |
|
12 |
import junit.framework.Test; |
13 |
import junit.framework.TestSuite; |
14 |
|
15 |
public class AtomicIntegerArrayTest extends JSR166TestCase { |
16 |
|
17 |
public static void main(String[] args) { |
18 |
main(suite(), args); |
19 |
} |
20 |
public static Test suite() { |
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return new TestSuite(AtomicIntegerArrayTest.class); |
22 |
} |
23 |
|
24 |
/** |
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* constructor creates array of given size with all elements zero |
26 |
*/ |
27 |
public void testConstructor() { |
28 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
29 |
for (int i = 0; i < SIZE; i++) |
30 |
assertEquals(0, aa.get(i)); |
31 |
} |
32 |
|
33 |
/** |
34 |
* constructor with null array throws NPE |
35 |
*/ |
36 |
public void testConstructor2NPE() { |
37 |
try { |
38 |
int[] a = null; |
39 |
new AtomicIntegerArray(a); |
40 |
shouldThrow(); |
41 |
} catch (NullPointerException success) {} |
42 |
} |
43 |
|
44 |
/** |
45 |
* constructor with array is of same size and has all elements |
46 |
*/ |
47 |
public void testConstructor2() { |
48 |
int[] a = { 17, 3, -42, 99, -7 }; |
49 |
AtomicIntegerArray aa = new AtomicIntegerArray(a); |
50 |
assertEquals(a.length, aa.length()); |
51 |
for (int i = 0; i < a.length; i++) |
52 |
assertEquals(a[i], aa.get(i)); |
53 |
} |
54 |
|
55 |
/** |
56 |
* get and set for out of bound indices throw IndexOutOfBoundsException |
57 |
*/ |
58 |
public void testIndexing() { |
59 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
60 |
for (int index : new int[] { -1, SIZE }) { |
61 |
try { |
62 |
aa.get(index); |
63 |
shouldThrow(); |
64 |
} catch (IndexOutOfBoundsException success) {} |
65 |
try { |
66 |
aa.set(index, 1); |
67 |
shouldThrow(); |
68 |
} catch (IndexOutOfBoundsException success) {} |
69 |
try { |
70 |
aa.lazySet(index, 1); |
71 |
shouldThrow(); |
72 |
} catch (IndexOutOfBoundsException success) {} |
73 |
try { |
74 |
aa.compareAndSet(index, 1, 2); |
75 |
shouldThrow(); |
76 |
} catch (IndexOutOfBoundsException success) {} |
77 |
try { |
78 |
aa.weakCompareAndSet(index, 1, 2); |
79 |
shouldThrow(); |
80 |
} catch (IndexOutOfBoundsException success) {} |
81 |
try { |
82 |
aa.getAndAdd(index, 1); |
83 |
shouldThrow(); |
84 |
} catch (IndexOutOfBoundsException success) {} |
85 |
try { |
86 |
aa.addAndGet(index, 1); |
87 |
shouldThrow(); |
88 |
} catch (IndexOutOfBoundsException success) {} |
89 |
try { |
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aa.getPlain(index); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
93 |
try { |
94 |
aa.getOpaque(index); |
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shouldThrow(); |
96 |
} catch (IndexOutOfBoundsException success) {} |
97 |
try { |
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aa.getAcquire(index); |
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shouldThrow(); |
100 |
} catch (IndexOutOfBoundsException success) {} |
101 |
try { |
102 |
aa.setPlain(index, 1); |
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shouldThrow(); |
104 |
} catch (IndexOutOfBoundsException success) {} |
105 |
try { |
106 |
aa.setOpaque(index, 1); |
107 |
shouldThrow(); |
108 |
} catch (IndexOutOfBoundsException success) {} |
109 |
try { |
110 |
aa.setRelease(index, 1); |
111 |
shouldThrow(); |
112 |
} catch (IndexOutOfBoundsException success) {} |
113 |
try { |
114 |
aa.compareAndExchange(index, 1, 2); |
115 |
shouldThrow(); |
116 |
} catch (IndexOutOfBoundsException success) {} |
117 |
try { |
118 |
aa.compareAndExchangeAcquire(index, 1, 2); |
119 |
shouldThrow(); |
120 |
} catch (IndexOutOfBoundsException success) {} |
121 |
try { |
122 |
aa.compareAndExchangeRelease(index, 1, 2); |
123 |
shouldThrow(); |
124 |
} catch (IndexOutOfBoundsException success) {} |
125 |
try { |
126 |
aa.weakCompareAndSetVolatile(index, 1, 2); |
127 |
shouldThrow(); |
128 |
} catch (IndexOutOfBoundsException success) {} |
129 |
try { |
130 |
aa.weakCompareAndSetAcquire(index, 1, 2); |
131 |
shouldThrow(); |
132 |
} catch (IndexOutOfBoundsException success) {} |
133 |
try { |
134 |
aa.weakCompareAndSetRelease(index, 1, 2); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
137 |
} |
138 |
} |
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|
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/** |
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* get returns the last value set at index |
142 |
*/ |
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public void testGetSet() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
145 |
for (int i = 0; i < SIZE; i++) { |
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aa.set(i, 1); |
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assertEquals(1, aa.get(i)); |
148 |
aa.set(i, 2); |
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assertEquals(2, aa.get(i)); |
150 |
aa.set(i, -3); |
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assertEquals(-3, aa.get(i)); |
152 |
} |
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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 |
157 |
*/ |
158 |
public void testGetLazySet() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
160 |
for (int i = 0; i < SIZE; i++) { |
161 |
aa.lazySet(i, 1); |
162 |
assertEquals(1, aa.get(i)); |
163 |
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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} |
168 |
} |
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|
170 |
/** |
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* compareAndSet succeeds in changing value if equal to expected else fails |
172 |
*/ |
173 |
public void testCompareAndSet() { |
174 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
175 |
for (int i = 0; i < SIZE; i++) { |
176 |
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)); |
180 |
assertFalse(aa.compareAndSet(i, -5, 7)); |
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assertEquals(-4, aa.get(i)); |
182 |
assertTrue(aa.compareAndSet(i, -4, 7)); |
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assertEquals(7, aa.get(i)); |
184 |
} |
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} |
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|
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/** |
188 |
* compareAndSet in one thread enables another waiting for value |
189 |
* to succeed |
190 |
*/ |
191 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
192 |
final AtomicIntegerArray a = new AtomicIntegerArray(1); |
193 |
a.set(0, 1); |
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Thread t = new Thread(new CheckedRunnable() { |
195 |
public void realRun() { |
196 |
while (!a.compareAndSet(0, 2, 3)) |
197 |
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()); |
204 |
assertEquals(3, a.get(0)); |
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} |
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|
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/** |
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* repeated weakCompareAndSet succeeds in changing value when equal |
209 |
* to expected |
210 |
*/ |
211 |
public void testWeakCompareAndSet() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
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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)); |
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assertEquals(-4, aa.get(i)); |
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do {} while (!aa.weakCompareAndSet(i, -4, 7)); |
219 |
assertEquals(7, aa.get(i)); |
220 |
} |
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} |
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|
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/** |
224 |
* getAndSet returns previous value and sets to given value at given index |
225 |
*/ |
226 |
public void testGetAndSet() { |
227 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
228 |
for (int i = 0; i < SIZE; i++) { |
229 |
aa.set(i, 1); |
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assertEquals(1, aa.getAndSet(i, 0)); |
231 |
assertEquals(0, aa.getAndSet(i, -10)); |
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assertEquals(-10, aa.getAndSet(i, 1)); |
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} |
234 |
} |
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|
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/** |
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* getAndAdd returns previous value and adds given value |
238 |
*/ |
239 |
public void testGetAndAdd() { |
240 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
241 |
for (int i = 0; i < SIZE; i++) { |
242 |
aa.set(i, 1); |
243 |
assertEquals(1, aa.getAndAdd(i, 2)); |
244 |
assertEquals(3, aa.get(i)); |
245 |
assertEquals(3, aa.getAndAdd(i, -4)); |
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assertEquals(-1, aa.get(i)); |
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} |
248 |
} |
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|
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/** |
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* getAndDecrement returns previous value and decrements |
252 |
*/ |
253 |
public void testGetAndDecrement() { |
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AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
255 |
for (int i = 0; i < SIZE; i++) { |
256 |
aa.set(i, 1); |
257 |
assertEquals(1, aa.getAndDecrement(i)); |
258 |
assertEquals(0, aa.getAndDecrement(i)); |
259 |
assertEquals(-1, aa.getAndDecrement(i)); |
260 |
} |
261 |
} |
262 |
|
263 |
/** |
264 |
* getAndIncrement returns previous value and increments |
265 |
*/ |
266 |
public void testGetAndIncrement() { |
267 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
268 |
for (int i = 0; i < SIZE; i++) { |
269 |
aa.set(i, 1); |
270 |
assertEquals(1, aa.getAndIncrement(i)); |
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assertEquals(2, aa.get(i)); |
272 |
aa.set(i, -2); |
273 |
assertEquals(-2, aa.getAndIncrement(i)); |
274 |
assertEquals(-1, aa.getAndIncrement(i)); |
275 |
assertEquals(0, aa.getAndIncrement(i)); |
276 |
assertEquals(1, aa.get(i)); |
277 |
} |
278 |
} |
279 |
|
280 |
/** |
281 |
* addAndGet adds given value to current, and returns current value |
282 |
*/ |
283 |
public void testAddAndGet() { |
284 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
285 |
for (int i = 0; i < SIZE; i++) { |
286 |
aa.set(i, 1); |
287 |
assertEquals(3, aa.addAndGet(i, 2)); |
288 |
assertEquals(3, aa.get(i)); |
289 |
assertEquals(-1, aa.addAndGet(i, -4)); |
290 |
assertEquals(-1, aa.get(i)); |
291 |
} |
292 |
} |
293 |
|
294 |
/** |
295 |
* decrementAndGet decrements and returns current value |
296 |
*/ |
297 |
public void testDecrementAndGet() { |
298 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
299 |
for (int i = 0; i < SIZE; i++) { |
300 |
aa.set(i, 1); |
301 |
assertEquals(0, aa.decrementAndGet(i)); |
302 |
assertEquals(-1, aa.decrementAndGet(i)); |
303 |
assertEquals(-2, aa.decrementAndGet(i)); |
304 |
assertEquals(-2, aa.get(i)); |
305 |
} |
306 |
} |
307 |
|
308 |
/** |
309 |
* incrementAndGet increments and returns current value |
310 |
*/ |
311 |
public void testIncrementAndGet() { |
312 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
313 |
for (int i = 0; i < SIZE; i++) { |
314 |
aa.set(i, 1); |
315 |
assertEquals(2, aa.incrementAndGet(i)); |
316 |
assertEquals(2, aa.get(i)); |
317 |
aa.set(i, -2); |
318 |
assertEquals(-1, aa.incrementAndGet(i)); |
319 |
assertEquals(0, aa.incrementAndGet(i)); |
320 |
assertEquals(1, aa.incrementAndGet(i)); |
321 |
assertEquals(1, aa.get(i)); |
322 |
} |
323 |
} |
324 |
|
325 |
class Counter extends CheckedRunnable { |
326 |
final AtomicIntegerArray aa; |
327 |
volatile int counts; |
328 |
Counter(AtomicIntegerArray a) { aa = a; } |
329 |
public void realRun() { |
330 |
for (;;) { |
331 |
boolean done = true; |
332 |
for (int i = 0; i < aa.length(); i++) { |
333 |
int v = aa.get(i); |
334 |
assertTrue(v >= 0); |
335 |
if (v != 0) { |
336 |
done = false; |
337 |
if (aa.compareAndSet(i, v, v - 1)) |
338 |
++counts; |
339 |
} |
340 |
} |
341 |
if (done) |
342 |
break; |
343 |
} |
344 |
} |
345 |
} |
346 |
|
347 |
/** |
348 |
* Multiple threads using same array of counters successfully |
349 |
* update a number of times equal to total count |
350 |
*/ |
351 |
public void testCountingInMultipleThreads() throws InterruptedException { |
352 |
final AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
353 |
int countdown = 10000; |
354 |
for (int i = 0; i < SIZE; i++) |
355 |
aa.set(i, countdown); |
356 |
Counter c1 = new Counter(aa); |
357 |
Counter c2 = new Counter(aa); |
358 |
Thread t1 = new Thread(c1); |
359 |
Thread t2 = new Thread(c2); |
360 |
t1.start(); |
361 |
t2.start(); |
362 |
t1.join(); |
363 |
t2.join(); |
364 |
assertEquals(c1.counts+c2.counts, SIZE * countdown); |
365 |
} |
366 |
|
367 |
/** |
368 |
* a deserialized serialized array holds same values |
369 |
*/ |
370 |
public void testSerialization() throws Exception { |
371 |
AtomicIntegerArray x = new AtomicIntegerArray(SIZE); |
372 |
for (int i = 0; i < SIZE; i++) |
373 |
x.set(i, -i); |
374 |
AtomicIntegerArray y = serialClone(x); |
375 |
assertNotSame(x, y); |
376 |
assertEquals(x.length(), y.length()); |
377 |
for (int i = 0; i < SIZE; i++) { |
378 |
assertEquals(x.get(i), y.get(i)); |
379 |
} |
380 |
} |
381 |
|
382 |
/** |
383 |
* toString returns current value. |
384 |
*/ |
385 |
public void testToString() { |
386 |
int[] a = { 17, 3, -42, 99, -7 }; |
387 |
AtomicIntegerArray aa = new AtomicIntegerArray(a); |
388 |
assertEquals(Arrays.toString(a), aa.toString()); |
389 |
} |
390 |
|
391 |
// jdk9 |
392 |
|
393 |
/** |
394 |
* getPlain returns the last value set |
395 |
*/ |
396 |
public void testGetPlainSet() { |
397 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
398 |
for (int i = 0; i < SIZE; i++) { |
399 |
aa.set(i, 1); |
400 |
assertEquals(1, aa.getPlain(i)); |
401 |
aa.set(i, 2); |
402 |
assertEquals(2, aa.getPlain(i)); |
403 |
aa.set(i, -3); |
404 |
assertEquals(-3, aa.getPlain(i)); |
405 |
} |
406 |
} |
407 |
|
408 |
/** |
409 |
* getOpaque returns the last value set |
410 |
*/ |
411 |
public void testGetOpaqueSet() { |
412 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
413 |
for (int i = 0; i < SIZE; i++) { |
414 |
aa.set(i, 1); |
415 |
assertEquals(1, aa.getOpaque(i)); |
416 |
aa.set(i, 2); |
417 |
assertEquals(2, aa.getOpaque(i)); |
418 |
aa.set(i, -3); |
419 |
assertEquals(-3, aa.getOpaque(i)); |
420 |
} |
421 |
} |
422 |
|
423 |
/** |
424 |
* getAcquire returns the last value set |
425 |
*/ |
426 |
public void testGetAcquireSet() { |
427 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
428 |
for (int i = 0; i < SIZE; i++) { |
429 |
aa.set(i, 1); |
430 |
assertEquals(1, aa.getAcquire(i)); |
431 |
aa.set(i, 2); |
432 |
assertEquals(2, aa.getAcquire(i)); |
433 |
aa.set(i, -3); |
434 |
assertEquals(-3, aa.getAcquire(i)); |
435 |
} |
436 |
} |
437 |
|
438 |
/** |
439 |
* get returns the last value setPlain |
440 |
*/ |
441 |
public void testGetSetPlain() { |
442 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
443 |
for (int i = 0; i < SIZE; i++) { |
444 |
aa.setPlain(i, 1); |
445 |
assertEquals(1, aa.get(i)); |
446 |
aa.setPlain(i, 2); |
447 |
assertEquals(2, aa.get(i)); |
448 |
aa.setPlain(i, -3); |
449 |
assertEquals(-3, aa.get(i)); |
450 |
} |
451 |
} |
452 |
|
453 |
/** |
454 |
* get returns the last value setOpaque |
455 |
*/ |
456 |
public void testGetSetOpaque() { |
457 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
458 |
for (int i = 0; i < SIZE; i++) { |
459 |
aa.setOpaque(i, 1); |
460 |
assertEquals(1, aa.get(i)); |
461 |
aa.setOpaque(i, 2); |
462 |
assertEquals(2, aa.get(i)); |
463 |
aa.setOpaque(i, -3); |
464 |
assertEquals(-3, aa.get(i)); |
465 |
} |
466 |
} |
467 |
|
468 |
/** |
469 |
* get returns the last value setRelease |
470 |
*/ |
471 |
public void testGetSetRelease() { |
472 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
473 |
for (int i = 0; i < SIZE; i++) { |
474 |
aa.setRelease(i, 1); |
475 |
assertEquals(1, aa.get(i)); |
476 |
aa.setRelease(i, 2); |
477 |
assertEquals(2, aa.get(i)); |
478 |
aa.setRelease(i, -3); |
479 |
assertEquals(-3, aa.get(i)); |
480 |
} |
481 |
} |
482 |
|
483 |
/** |
484 |
* compareAndExchange succeeds in changing value if equal to |
485 |
* expected else fails |
486 |
*/ |
487 |
public void testCompareAndExchange() { |
488 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
489 |
for (int i = 0; i < SIZE; i++) { |
490 |
aa.set(i, 1); |
491 |
assertEquals(1, aa.compareAndExchange(i, 1, 2)); |
492 |
assertEquals(2, aa.compareAndExchange(i, 2, -4)); |
493 |
assertEquals(-4, aa.get(i)); |
494 |
assertEquals(-4, aa.compareAndExchange(i,-5, 7)); |
495 |
assertEquals(-4, aa.get(i)); |
496 |
assertEquals(-4, aa.compareAndExchange(i, -4, 7)); |
497 |
assertEquals(7, aa.get(i)); |
498 |
} |
499 |
} |
500 |
|
501 |
/** |
502 |
* compareAndExchangeAcquire succeeds in changing value if equal to |
503 |
* expected else fails |
504 |
*/ |
505 |
public void testCompareAndExchangeAcquire() { |
506 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
507 |
for (int i = 0; i < SIZE; i++) { |
508 |
aa.set(i, 1); |
509 |
assertEquals(1, aa.compareAndExchangeAcquire(i, 1, 2)); |
510 |
assertEquals(2, aa.compareAndExchangeAcquire(i, 2, -4)); |
511 |
assertEquals(-4, aa.get(i)); |
512 |
assertEquals(-4, aa.compareAndExchangeAcquire(i,-5, 7)); |
513 |
assertEquals(-4, aa.get(i)); |
514 |
assertEquals(-4, aa.compareAndExchangeAcquire(i, -4, 7)); |
515 |
assertEquals(7, aa.get(i)); |
516 |
} |
517 |
} |
518 |
|
519 |
/** |
520 |
* compareAndExchangeRelease succeeds in changing value if equal to |
521 |
* expected else fails |
522 |
*/ |
523 |
public void testCompareAndExchangeRelease() { |
524 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
525 |
for (int i = 0; i < SIZE; i++) { |
526 |
aa.set(i, 1); |
527 |
assertEquals(1, aa.compareAndExchangeRelease(i, 1, 2)); |
528 |
assertEquals(2, aa.compareAndExchangeRelease(i, 2, -4)); |
529 |
assertEquals(-4, aa.get(i)); |
530 |
assertEquals(-4, aa.compareAndExchangeRelease(i,-5, 7)); |
531 |
assertEquals(-4, aa.get(i)); |
532 |
assertEquals(-4, aa.compareAndExchangeRelease(i, -4, 7)); |
533 |
assertEquals(7, aa.get(i)); |
534 |
} |
535 |
} |
536 |
|
537 |
/** |
538 |
* repeated weakCompareAndSetVolatile succeeds in changing value when equal |
539 |
* to expected |
540 |
*/ |
541 |
public void testWeakCompareAndSetVolatile() { |
542 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
543 |
for (int i = 0; i < SIZE; i++) { |
544 |
aa.set(i, 1); |
545 |
do {} while (!aa.weakCompareAndSetVolatile(i, 1, 2)); |
546 |
do {} while (!aa.weakCompareAndSetVolatile(i, 2, -4)); |
547 |
assertEquals(-4, aa.get(i)); |
548 |
do {} while (!aa.weakCompareAndSetVolatile(i, -4, 7)); |
549 |
assertEquals(7, aa.get(i)); |
550 |
} |
551 |
} |
552 |
|
553 |
/** |
554 |
* repeated weakCompareAndSetAcquire succeeds in changing value when equal |
555 |
* to expected |
556 |
*/ |
557 |
public void testWeakCompareAndSetAcquire() { |
558 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
559 |
for (int i = 0; i < SIZE; i++) { |
560 |
aa.set(i, 1); |
561 |
do {} while (!aa.weakCompareAndSetAcquire(i, 1, 2)); |
562 |
do {} while (!aa.weakCompareAndSetAcquire(i, 2, -4)); |
563 |
assertEquals(-4, aa.get(i)); |
564 |
do {} while (!aa.weakCompareAndSetAcquire(i, -4, 7)); |
565 |
assertEquals(7, aa.get(i)); |
566 |
} |
567 |
} |
568 |
|
569 |
/** |
570 |
* repeated weakCompareAndSetRelease succeeds in changing value when equal |
571 |
* to expected |
572 |
*/ |
573 |
public void testWeakCompareAndSetRelease() { |
574 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
575 |
for (int i = 0; i < SIZE; i++) { |
576 |
aa.set(i, 1); |
577 |
do {} while (!aa.weakCompareAndSetRelease(i, 1, 2)); |
578 |
do {} while (!aa.weakCompareAndSetRelease(i, 2, -4)); |
579 |
assertEquals(-4, aa.get(i)); |
580 |
do {} while (!aa.weakCompareAndSetRelease(i, -4, 7)); |
581 |
assertEquals(7, aa.get(i)); |
582 |
} |
583 |
} |
584 |
|
585 |
} |