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/licenses/publicdomain |
5 |
* Other contributors include John Vint |
6 |
*/ |
7 |
|
8 |
import java.util.ArrayList; |
9 |
import java.util.List; |
10 |
import java.util.concurrent.atomic.AtomicInteger; |
11 |
import java.util.concurrent.atomic.AtomicBoolean; |
12 |
import java.util.concurrent.*; |
13 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
14 |
import static java.util.concurrent.TimeUnit.NANOSECONDS; |
15 |
import junit.framework.Test; |
16 |
import junit.framework.TestSuite; |
17 |
|
18 |
public class PhaserTest extends JSR166TestCase { |
19 |
|
20 |
public static void main(String[] args) { |
21 |
junit.textui.TestRunner.run(suite()); |
22 |
} |
23 |
|
24 |
public static Test suite() { |
25 |
return new TestSuite(PhaserTest.class); |
26 |
} |
27 |
|
28 |
private static final int maxParties = 65535; |
29 |
|
30 |
/** Checks state of phaser. */ |
31 |
protected void assertState(Phaser phaser, |
32 |
int phase, int parties, int unarrived) { |
33 |
assertEquals(phase, phaser.getPhase()); |
34 |
assertEquals(parties, phaser.getRegisteredParties()); |
35 |
assertEquals(unarrived, phaser.getUnarrivedParties()); |
36 |
assertEquals(parties - unarrived, phaser.getArrivedParties()); |
37 |
assertTrue((phaser.getPhase() >= 0) ^ phaser.isTerminated()); |
38 |
} |
39 |
|
40 |
/** Checks state of terminated phaser. */ |
41 |
protected void assertTerminated(Phaser phaser, int parties, int unarrived) { |
42 |
assertTrue(phaser.isTerminated()); |
43 |
assertTrue(phaser.getPhase() < 0); |
44 |
assertEquals(parties, phaser.getRegisteredParties()); |
45 |
assertEquals(unarrived, phaser.getUnarrivedParties()); |
46 |
assertEquals(parties - unarrived, phaser.getArrivedParties()); |
47 |
} |
48 |
|
49 |
protected void assertTerminated(Phaser phaser) { |
50 |
assertTerminated(phaser, 0, 0); |
51 |
} |
52 |
|
53 |
/** |
54 |
* Empty constructor builds a new Phaser with no parent, no registered |
55 |
* parties and initial phase number of 0 |
56 |
*/ |
57 |
public void testConstructorDefaultValues() { |
58 |
Phaser phaser = new Phaser(); |
59 |
assertNull(phaser.getParent()); |
60 |
assertEquals(0, phaser.getRegisteredParties()); |
61 |
assertEquals(0, phaser.getArrivedParties()); |
62 |
assertEquals(0, phaser.getUnarrivedParties()); |
63 |
assertEquals(0, phaser.getPhase()); |
64 |
} |
65 |
|
66 |
/** |
67 |
* Constructing with a negative number of parties throws |
68 |
* IllegalArgumentException |
69 |
*/ |
70 |
public void testConstructorNegativeParties() { |
71 |
try { |
72 |
new Phaser(-1); |
73 |
shouldThrow(); |
74 |
} catch (IllegalArgumentException success) {} |
75 |
} |
76 |
|
77 |
/** |
78 |
* Constructing with a negative number of parties throws |
79 |
* IllegalArgumentException |
80 |
*/ |
81 |
public void testConstructorNegativeParties2() { |
82 |
try { |
83 |
new Phaser(new Phaser(), -1); |
84 |
shouldThrow(); |
85 |
} catch (IllegalArgumentException success) {} |
86 |
} |
87 |
|
88 |
/** |
89 |
* Constructing with a number of parties > 65535 throws |
90 |
* IllegalArgumentException |
91 |
*/ |
92 |
public void testConstructorPartiesExceedsLimit() { |
93 |
new Phaser(maxParties); |
94 |
try { |
95 |
new Phaser(maxParties + 1); |
96 |
shouldThrow(); |
97 |
} catch (IllegalArgumentException success) {} |
98 |
|
99 |
new Phaser(new Phaser(), maxParties); |
100 |
try { |
101 |
new Phaser(new Phaser(), maxParties + 1); |
102 |
shouldThrow(); |
103 |
} catch (IllegalArgumentException success) {} |
104 |
} |
105 |
|
106 |
/** |
107 |
* The parent provided to the constructor should be returned from |
108 |
* a later call to getParent |
109 |
*/ |
110 |
public void testConstructor3() { |
111 |
Phaser parent = new Phaser(); |
112 |
assertSame(parent, new Phaser(parent).getParent()); |
113 |
assertNull(new Phaser(null).getParent()); |
114 |
} |
115 |
|
116 |
/** |
117 |
* The parent being input into the parameter should equal the original |
118 |
* parent when being returned |
119 |
*/ |
120 |
public void testConstructor5() { |
121 |
Phaser parent = new Phaser(); |
122 |
assertSame(parent, new Phaser(parent, 0).getParent()); |
123 |
assertNull(new Phaser(null, 0).getParent()); |
124 |
} |
125 |
|
126 |
/** |
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* register() will increment the number of unarrived parties by |
128 |
* one and not affect its arrived parties |
129 |
*/ |
130 |
public void testRegister1() { |
131 |
Phaser phaser = new Phaser(); |
132 |
assertState(phaser, 0, 0, 0); |
133 |
assertEquals(0, phaser.register()); |
134 |
assertState(phaser, 0, 1, 1); |
135 |
} |
136 |
|
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/** |
138 |
* Registering more than 65536 parties causes IllegalStateException |
139 |
*/ |
140 |
public void testRegister2() { |
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Phaser phaser = new Phaser(0); |
142 |
assertState(phaser, 0, 0, 0); |
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assertEquals(0, phaser.bulkRegister(maxParties - 10)); |
144 |
assertState(phaser, 0, maxParties - 10, maxParties - 10); |
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for (int i = 0; i < 10; i++) { |
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assertState(phaser, 0, maxParties - 10 + i, maxParties - 10 + i); |
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assertEquals(0, phaser.register()); |
148 |
} |
149 |
assertState(phaser, 0, maxParties, maxParties); |
150 |
try { |
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phaser.register(); |
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shouldThrow(); |
153 |
} catch (IllegalStateException success) {} |
154 |
|
155 |
try { |
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phaser.bulkRegister(Integer.MAX_VALUE); |
157 |
shouldThrow(); |
158 |
} catch (IllegalStateException success) {} |
159 |
} |
160 |
|
161 |
/** |
162 |
* register() correctly returns the current barrier phase number when |
163 |
* invoked |
164 |
*/ |
165 |
public void testRegister3() { |
166 |
Phaser phaser = new Phaser(); |
167 |
assertEquals(0, phaser.register()); |
168 |
assertEquals(0, phaser.arrive()); |
169 |
assertEquals(1, phaser.register()); |
170 |
assertState(phaser, 1, 2, 2); |
171 |
} |
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|
173 |
/** |
174 |
* register causes the next arrive to not increment the phase rather retain |
175 |
* the phase number |
176 |
*/ |
177 |
public void testRegister4() { |
178 |
Phaser phaser = new Phaser(1); |
179 |
assertEquals(0, phaser.arrive()); |
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assertEquals(1, phaser.register()); |
181 |
assertEquals(1, phaser.arrive()); |
182 |
assertState(phaser, 1, 2, 1); |
183 |
} |
184 |
|
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/** |
186 |
* Invoking bulkRegister with a negative parameter throws an |
187 |
* IllegalArgumentException |
188 |
*/ |
189 |
public void testBulkRegister1() { |
190 |
try { |
191 |
new Phaser().bulkRegister(-1); |
192 |
shouldThrow(); |
193 |
} catch (IllegalArgumentException success) {} |
194 |
} |
195 |
|
196 |
/** |
197 |
* bulkRegister should correctly record the number of unarrived parties with |
198 |
* the number of parties being registered |
199 |
*/ |
200 |
public void testBulkRegister2() { |
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Phaser phaser = new Phaser(); |
202 |
assertEquals(0, phaser.bulkRegister(20)); |
203 |
assertState(phaser, 0, 20, 20); |
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} |
205 |
|
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/** |
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* Registering with a number of parties greater than or equal to 1<<16 |
208 |
* throws IllegalStateException. |
209 |
*/ |
210 |
public void testBulkRegister3() { |
211 |
assertEquals(0, new Phaser().bulkRegister((1 << 16) - 1)); |
212 |
|
213 |
try { |
214 |
new Phaser().bulkRegister(1 << 16); |
215 |
shouldThrow(); |
216 |
} catch (IllegalStateException success) {} |
217 |
|
218 |
try { |
219 |
new Phaser(2).bulkRegister((1 << 16) - 2); |
220 |
shouldThrow(); |
221 |
} catch (IllegalStateException success) {} |
222 |
} |
223 |
|
224 |
/** |
225 |
* the phase number increments correctly when tripping the barrier |
226 |
*/ |
227 |
public void testPhaseIncrement1() { |
228 |
for (int size = 1; size < nine; size++) { |
229 |
final Phaser phaser = new Phaser(size); |
230 |
for (int index = 0; index <= (1 << size); index++) { |
231 |
int phase = phaser.arrive(); |
232 |
assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
233 |
} |
234 |
} |
235 |
} |
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|
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/** |
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* arrive() on a registered phaser increments phase. |
239 |
*/ |
240 |
public void testArrive1() { |
241 |
Phaser phaser = new Phaser(1); |
242 |
assertState(phaser, 0, 1, 1); |
243 |
assertEquals(0, phaser.arrive()); |
244 |
assertState(phaser, 1, 1, 1); |
245 |
} |
246 |
|
247 |
/** |
248 |
* arriveAndDeregister does not wait for others to arrive at barrier |
249 |
*/ |
250 |
public void testArriveAndDeregister() throws InterruptedException { |
251 |
final Phaser phaser = new Phaser(1); |
252 |
for (int i = 0; i < 10; i++) { |
253 |
assertState(phaser, 0, 1, 1); |
254 |
assertEquals(0, phaser.register()); |
255 |
assertState(phaser, 0, 2, 2); |
256 |
assertEquals(0, phaser.arriveAndDeregister()); |
257 |
assertState(phaser, 0, 1, 1); |
258 |
} |
259 |
assertEquals(0, phaser.arriveAndDeregister()); |
260 |
assertTerminated(phaser); |
261 |
assertEquals(1, phaser.getPhase() + Integer.MIN_VALUE); |
262 |
} |
263 |
|
264 |
/** |
265 |
* arriveAndDeregister does not wait for others to arrive at barrier |
266 |
*/ |
267 |
public void testArrive2() throws InterruptedException { |
268 |
final Phaser phaser = new Phaser(); |
269 |
assertEquals(0, phaser.register()); |
270 |
List<Thread> threads = new ArrayList<Thread>(); |
271 |
for (int i = 0; i < 10; i++) { |
272 |
assertEquals(0, phaser.register()); |
273 |
threads.add(newStartedThread(new CheckedRunnable() { |
274 |
public void realRun() throws InterruptedException { |
275 |
assertEquals(0, phaser.arriveAndDeregister()); |
276 |
}})); |
277 |
} |
278 |
|
279 |
for (Thread thread : threads) |
280 |
awaitTermination(thread, LONG_DELAY_MS); |
281 |
assertState(phaser, 0, 1, 1); |
282 |
assertEquals(0, phaser.arrive()); |
283 |
assertState(phaser, 1, 1, 1); |
284 |
} |
285 |
|
286 |
/** |
287 |
* arrive() returns a negative number if the Phaser is terminated |
288 |
*/ |
289 |
public void testArrive3() { |
290 |
Phaser phaser = new Phaser(1); |
291 |
phaser.forceTermination(); |
292 |
assertTerminated(phaser, 1, 1); |
293 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
294 |
assertTrue(phaser.arrive() < 0); |
295 |
assertTrue(phaser.register() < 0); |
296 |
assertTrue(phaser.arriveAndDeregister() < 0); |
297 |
assertTrue(phaser.awaitAdvance(1) < 0); |
298 |
assertTrue(phaser.getPhase() < 0); |
299 |
} |
300 |
|
301 |
/** |
302 |
* arriveAndDeregister() throws IllegalStateException if number of |
303 |
* registered or unarrived parties would become negative |
304 |
*/ |
305 |
public void testArriveAndDeregister1() { |
306 |
try { |
307 |
Phaser phaser = new Phaser(); |
308 |
phaser.arriveAndDeregister(); |
309 |
shouldThrow(); |
310 |
} catch (IllegalStateException success) {} |
311 |
} |
312 |
|
313 |
/** |
314 |
* arriveAndDeregister reduces the number of arrived parties |
315 |
*/ |
316 |
public void testArriveAndDeregister2() { |
317 |
final Phaser phaser = new Phaser(1); |
318 |
assertEquals(0, phaser.register()); |
319 |
assertEquals(0, phaser.arrive()); |
320 |
assertState(phaser, 0, 2, 1); |
321 |
assertEquals(0, phaser.arriveAndDeregister()); |
322 |
assertState(phaser, 1, 1, 1); |
323 |
} |
324 |
|
325 |
/** |
326 |
* arriveAndDeregister arrives at the barrier on a phaser with a parent and |
327 |
* when a deregistration occurs and causes the phaser to have zero parties |
328 |
* its parent will be deregistered as well |
329 |
*/ |
330 |
public void testArriveAndDeregister3() { |
331 |
Phaser parent = new Phaser(); |
332 |
Phaser child = new Phaser(parent); |
333 |
assertState(child, 0, 0, 0); |
334 |
assertState(parent, 0, 0, 0); |
335 |
assertEquals(0, child.register()); |
336 |
assertState(child, 0, 1, 1); |
337 |
assertState(parent, 0, 1, 1); |
338 |
assertEquals(0, child.arriveAndDeregister()); |
339 |
assertTerminated(child); |
340 |
assertTerminated(parent); |
341 |
} |
342 |
|
343 |
/** |
344 |
* arriveAndDeregister deregisters one party from its parent when |
345 |
* the number of parties of child is zero after deregistration |
346 |
*/ |
347 |
public void testArriveAndDeregister4() { |
348 |
Phaser parent = new Phaser(); |
349 |
Phaser child = new Phaser(parent); |
350 |
assertEquals(0, parent.register()); |
351 |
assertEquals(0, child.register()); |
352 |
assertState(child, 0, 1, 1); |
353 |
assertState(parent, 0, 2, 2); |
354 |
assertEquals(0, child.arriveAndDeregister()); |
355 |
assertState(child, 0, 0, 0); |
356 |
assertState(parent, 0, 1, 1); |
357 |
} |
358 |
|
359 |
/** |
360 |
* arriveAndDeregister deregisters one party from its parent when |
361 |
* the number of parties of root is nonzero after deregistration. |
362 |
*/ |
363 |
public void testArriveAndDeregister5() { |
364 |
Phaser root = new Phaser(); |
365 |
Phaser parent = new Phaser(root); |
366 |
Phaser child = new Phaser(parent); |
367 |
assertState(root, 0, 0, 0); |
368 |
assertState(parent, 0, 0, 0); |
369 |
assertState(child, 0, 0, 0); |
370 |
assertEquals(0, child.register()); |
371 |
assertState(root, 0, 1, 1); |
372 |
assertState(parent, 0, 1, 1); |
373 |
assertState(child, 0, 1, 1); |
374 |
assertEquals(0, child.arriveAndDeregister()); |
375 |
assertTerminated(child); |
376 |
assertTerminated(parent); |
377 |
assertTerminated(root); |
378 |
assertEquals(1, root.getPhase() + Integer.MIN_VALUE); |
379 |
} |
380 |
|
381 |
/** |
382 |
* arriveAndDeregister returns the phase in which it leaves the |
383 |
* phaser in after deregistration |
384 |
*/ |
385 |
public void testArriveAndDeregister6() throws InterruptedException { |
386 |
final Phaser phaser = new Phaser(2); |
387 |
Thread t = newStartedThread(new CheckedRunnable() { |
388 |
public void realRun() { |
389 |
assertEquals(0, phaser.arrive()); |
390 |
}}); |
391 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
392 |
assertState(phaser, 1, 2, 2); |
393 |
assertEquals(1, phaser.arriveAndDeregister()); |
394 |
assertState(phaser, 1, 1, 1); |
395 |
assertEquals(1, phaser.arriveAndDeregister()); |
396 |
assertTerminated(phaser); |
397 |
assertEquals(2, phaser.getPhase() + Integer.MIN_VALUE); |
398 |
awaitTermination(t, SHORT_DELAY_MS); |
399 |
} |
400 |
|
401 |
/** |
402 |
* awaitAdvance succeeds upon advance |
403 |
*/ |
404 |
public void testAwaitAdvance1() { |
405 |
final Phaser phaser = new Phaser(1); |
406 |
assertEquals(0, phaser.arrive()); |
407 |
assertEquals(1, phaser.awaitAdvance(0)); |
408 |
} |
409 |
|
410 |
/** |
411 |
* awaitAdvance with a negative parameter will return without affecting the |
412 |
* phaser |
413 |
*/ |
414 |
public void testAwaitAdvance2() { |
415 |
Phaser phaser = new Phaser(); |
416 |
assertTrue(phaser.awaitAdvance(-1) < 0); |
417 |
assertState(phaser, 0, 0, 0); |
418 |
} |
419 |
|
420 |
/** |
421 |
* awaitAdvance continues waiting if interrupted before waiting |
422 |
*/ |
423 |
public void testAwaitAdvanceAfterInterrupt() throws InterruptedException { |
424 |
final Phaser phaser = new Phaser(); |
425 |
assertEquals(0, phaser.register()); |
426 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
427 |
|
428 |
Thread t = newStartedThread(new CheckedRunnable() { |
429 |
public void realRun() throws InterruptedException { |
430 |
Thread.currentThread().interrupt(); |
431 |
assertEquals(0, phaser.register()); |
432 |
assertEquals(0, phaser.arrive()); |
433 |
threadStarted.countDown(); |
434 |
assertTrue(Thread.currentThread().isInterrupted()); |
435 |
assertEquals(1, phaser.awaitAdvance(0)); |
436 |
assertTrue(Thread.currentThread().isInterrupted()); |
437 |
}}); |
438 |
|
439 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
440 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
441 |
assertEquals(0, phaser.arrive()); |
442 |
awaitTermination(t, SMALL_DELAY_MS); |
443 |
|
444 |
Thread.currentThread().interrupt(); |
445 |
assertEquals(1, phaser.awaitAdvance(0)); |
446 |
assertTrue(Thread.interrupted()); |
447 |
} |
448 |
|
449 |
/** |
450 |
* awaitAdvance continues waiting if interrupted while waiting |
451 |
*/ |
452 |
public void testAwaitAdvanceBeforeInterrupt() throws InterruptedException { |
453 |
final Phaser phaser = new Phaser(); |
454 |
assertEquals(0, phaser.register()); |
455 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
456 |
|
457 |
Thread t = newStartedThread(new CheckedRunnable() { |
458 |
public void realRun() throws InterruptedException { |
459 |
assertEquals(0, phaser.register()); |
460 |
assertEquals(0, phaser.arrive()); |
461 |
threadStarted.countDown(); |
462 |
assertFalse(Thread.currentThread().isInterrupted()); |
463 |
assertEquals(1, phaser.awaitAdvance(0)); |
464 |
assertTrue(Thread.currentThread().isInterrupted()); |
465 |
}}); |
466 |
|
467 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
468 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
469 |
t.interrupt(); |
470 |
assertEquals(0, phaser.arrive()); |
471 |
awaitTermination(t, SMALL_DELAY_MS); |
472 |
|
473 |
Thread.currentThread().interrupt(); |
474 |
assertEquals(1, phaser.awaitAdvance(0)); |
475 |
assertTrue(Thread.interrupted()); |
476 |
} |
477 |
|
478 |
/** |
479 |
* arriveAndAwaitAdvance continues waiting if interrupted before waiting |
480 |
*/ |
481 |
public void testArriveAndAwaitAdvanceAfterInterrupt() |
482 |
throws InterruptedException { |
483 |
final Phaser phaser = new Phaser(); |
484 |
assertEquals(0, phaser.register()); |
485 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
486 |
|
487 |
Thread t = newStartedThread(new CheckedRunnable() { |
488 |
public void realRun() throws InterruptedException { |
489 |
Thread.currentThread().interrupt(); |
490 |
assertEquals(0, phaser.register()); |
491 |
threadStarted.countDown(); |
492 |
assertTrue(Thread.currentThread().isInterrupted()); |
493 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
494 |
assertTrue(Thread.currentThread().isInterrupted()); |
495 |
}}); |
496 |
|
497 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
498 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
499 |
Thread.currentThread().interrupt(); |
500 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
501 |
assertTrue(Thread.interrupted()); |
502 |
awaitTermination(t, SMALL_DELAY_MS); |
503 |
} |
504 |
|
505 |
/** |
506 |
* arriveAndAwaitAdvance continues waiting if interrupted while waiting |
507 |
*/ |
508 |
public void testArriveAndAwaitAdvanceBeforeInterrupt() |
509 |
throws InterruptedException { |
510 |
final Phaser phaser = new Phaser(); |
511 |
assertEquals(0, phaser.register()); |
512 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
513 |
|
514 |
Thread t = newStartedThread(new CheckedRunnable() { |
515 |
public void realRun() throws InterruptedException { |
516 |
assertEquals(0, phaser.register()); |
517 |
threadStarted.countDown(); |
518 |
assertFalse(Thread.currentThread().isInterrupted()); |
519 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
520 |
assertTrue(Thread.currentThread().isInterrupted()); |
521 |
}}); |
522 |
|
523 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
524 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
525 |
t.interrupt(); |
526 |
Thread.currentThread().interrupt(); |
527 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
528 |
assertTrue(Thread.interrupted()); |
529 |
awaitTermination(t, SMALL_DELAY_MS); |
530 |
} |
531 |
|
532 |
/** |
533 |
* awaitAdvance atomically waits for all parties within the same phase to |
534 |
* complete before continuing |
535 |
*/ |
536 |
public void testAwaitAdvance4() throws InterruptedException { |
537 |
final Phaser phaser = new Phaser(4); |
538 |
final AtomicInteger count = new AtomicInteger(0); |
539 |
List<Thread> threads = new ArrayList<Thread>(); |
540 |
for (int i = 0; i < 4; i++) |
541 |
threads.add(newStartedThread(new CheckedRunnable() { |
542 |
public void realRun() { |
543 |
for (int k = 0; k < 3; k++) { |
544 |
assertEquals(2*k+1, phaser.arriveAndAwaitAdvance()); |
545 |
count.incrementAndGet(); |
546 |
assertEquals(2*k+1, phaser.arrive()); |
547 |
assertEquals(2*k+2, phaser.awaitAdvance(2*k+1)); |
548 |
assertEquals(count.get(), 4*(k+1)); |
549 |
}}})); |
550 |
|
551 |
for (Thread thread : threads) |
552 |
awaitTermination(thread, MEDIUM_DELAY_MS); |
553 |
} |
554 |
|
555 |
/** |
556 |
* awaitAdvance returns the current phase |
557 |
*/ |
558 |
public void testAwaitAdvance5() throws InterruptedException { |
559 |
final Phaser phaser = new Phaser(1); |
560 |
assertEquals(1, phaser.awaitAdvance(phaser.arrive())); |
561 |
assertEquals(1, phaser.getPhase()); |
562 |
assertEquals(1, phaser.register()); |
563 |
List<Thread> threads = new ArrayList<Thread>(); |
564 |
for (int i = 0; i < 8; i++) { |
565 |
final CountDownLatch latch = new CountDownLatch(1); |
566 |
final boolean goesFirst = ((i & 1) == 0); |
567 |
threads.add(newStartedThread(new CheckedRunnable() { |
568 |
public void realRun() throws InterruptedException { |
569 |
if (goesFirst) |
570 |
latch.countDown(); |
571 |
else |
572 |
assertTrue(latch.await(SMALL_DELAY_MS, MILLISECONDS)); |
573 |
phaser.arrive(); |
574 |
}})); |
575 |
if (goesFirst) |
576 |
assertTrue(latch.await(SMALL_DELAY_MS, MILLISECONDS)); |
577 |
else |
578 |
latch.countDown(); |
579 |
assertEquals(i + 2, phaser.awaitAdvance(phaser.arrive())); |
580 |
assertEquals(i + 2, phaser.getPhase()); |
581 |
} |
582 |
for (Thread thread : threads) |
583 |
awaitTermination(thread, SMALL_DELAY_MS); |
584 |
} |
585 |
|
586 |
/** |
587 |
* awaitAdvance returns when the phaser is externally terminated |
588 |
*/ |
589 |
public void testAwaitAdvance6() throws InterruptedException { |
590 |
final Phaser phaser = new Phaser(3); |
591 |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
592 |
final List<Thread> threads = new ArrayList<Thread>(); |
593 |
for (int i = 0; i < 2; i++) { |
594 |
Runnable r = new CheckedRunnable() { |
595 |
public void realRun() { |
596 |
assertEquals(0, phaser.arrive()); |
597 |
threadsStarted.countDown(); |
598 |
assertTrue(phaser.awaitAdvance(0) < 0); |
599 |
assertTrue(phaser.isTerminated()); |
600 |
assertTrue(phaser.getPhase() < 0); |
601 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
602 |
assertEquals(3, phaser.getRegisteredParties()); |
603 |
}}; |
604 |
threads.add(newStartedThread(r)); |
605 |
} |
606 |
threadsStarted.await(); |
607 |
phaser.forceTermination(); |
608 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
609 |
for (Thread thread : threads) |
610 |
awaitTermination(thread, SMALL_DELAY_MS); |
611 |
assertTrue(phaser.isTerminated()); |
612 |
assertTrue(phaser.getPhase() < 0); |
613 |
assertEquals(3, phaser.getRegisteredParties()); |
614 |
} |
615 |
|
616 |
/** |
617 |
* arriveAndAwaitAdvance throws IllegalStateException with no |
618 |
* unarrived parties |
619 |
*/ |
620 |
public void testArriveAndAwaitAdvance1() { |
621 |
try { |
622 |
Phaser phaser = new Phaser(); |
623 |
phaser.arriveAndAwaitAdvance(); |
624 |
shouldThrow(); |
625 |
} catch (IllegalStateException success) {} |
626 |
} |
627 |
|
628 |
/** |
629 |
* arriveAndAwaitAdvance waits for all threads to arrive, the |
630 |
* number of arrived parties is the same number that is accounted |
631 |
* for when the main thread awaitsAdvance |
632 |
*/ |
633 |
public void testArriveAndAwaitAdvance3() throws InterruptedException { |
634 |
final Phaser phaser = new Phaser(1); |
635 |
final int THREADS = 3; |
636 |
final CountDownLatch threadsStarted = new CountDownLatch(THREADS); |
637 |
final List<Thread> threads = new ArrayList<Thread>(); |
638 |
for (int i = 0; i < THREADS; i++) |
639 |
threads.add(newStartedThread(new CheckedRunnable() { |
640 |
public void realRun() throws InterruptedException { |
641 |
assertEquals(0, phaser.register()); |
642 |
threadsStarted.countDown(); |
643 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
644 |
}})); |
645 |
|
646 |
assertTrue(threadsStarted.await(MEDIUM_DELAY_MS, MILLISECONDS)); |
647 |
long t0 = System.nanoTime(); |
648 |
while (phaser.getArrivedParties() < THREADS) |
649 |
Thread.yield(); |
650 |
assertEquals(THREADS, phaser.getArrivedParties()); |
651 |
assertTrue(NANOSECONDS.toMillis(System.nanoTime() - t0) < SMALL_DELAY_MS); |
652 |
for (Thread thread : threads) |
653 |
assertTrue(thread.isAlive()); |
654 |
assertState(phaser, 0, THREADS + 1, 1); |
655 |
phaser.arriveAndAwaitAdvance(); |
656 |
for (Thread thread : threads) |
657 |
awaitTermination(thread, SMALL_DELAY_MS); |
658 |
assertState(phaser, 1, THREADS + 1, THREADS + 1); |
659 |
} |
660 |
|
661 |
} |