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, |
42 |
int maxPhase, int parties, int unarrived) { |
43 |
assertTrue(phaser.isTerminated()); |
44 |
int expectedPhase = maxPhase + Integer.MIN_VALUE; |
45 |
assertEquals(expectedPhase, phaser.getPhase()); |
46 |
assertEquals(parties, phaser.getRegisteredParties()); |
47 |
assertEquals(expectedPhase, phaser.register()); |
48 |
assertEquals(expectedPhase, phaser.arrive()); |
49 |
assertEquals(expectedPhase, phaser.arriveAndDeregister()); |
50 |
} |
51 |
|
52 |
protected void assertTerminated(Phaser phaser, int maxPhase) { |
53 |
assertTerminated(phaser, maxPhase, 0, 0); |
54 |
} |
55 |
|
56 |
/** |
57 |
* Empty constructor builds a new Phaser with no parent, no registered |
58 |
* parties and initial phase number of 0 |
59 |
*/ |
60 |
public void testConstructorDefaultValues() { |
61 |
Phaser phaser = new Phaser(); |
62 |
assertNull(phaser.getParent()); |
63 |
assertEquals(0, phaser.getRegisteredParties()); |
64 |
assertEquals(0, phaser.getArrivedParties()); |
65 |
assertEquals(0, phaser.getUnarrivedParties()); |
66 |
assertEquals(0, phaser.getPhase()); |
67 |
} |
68 |
|
69 |
/** |
70 |
* Constructing with a negative number of parties throws |
71 |
* IllegalArgumentException |
72 |
*/ |
73 |
public void testConstructorNegativeParties() { |
74 |
try { |
75 |
new Phaser(-1); |
76 |
shouldThrow(); |
77 |
} catch (IllegalArgumentException success) {} |
78 |
} |
79 |
|
80 |
/** |
81 |
* Constructing with a negative number of parties throws |
82 |
* IllegalArgumentException |
83 |
*/ |
84 |
public void testConstructorNegativeParties2() { |
85 |
try { |
86 |
new Phaser(new Phaser(), -1); |
87 |
shouldThrow(); |
88 |
} catch (IllegalArgumentException success) {} |
89 |
} |
90 |
|
91 |
/** |
92 |
* Constructing with a number of parties > 65535 throws |
93 |
* IllegalArgumentException |
94 |
*/ |
95 |
public void testConstructorPartiesExceedsLimit() { |
96 |
new Phaser(maxParties); |
97 |
try { |
98 |
new Phaser(maxParties + 1); |
99 |
shouldThrow(); |
100 |
} catch (IllegalArgumentException success) {} |
101 |
|
102 |
new Phaser(new Phaser(), maxParties); |
103 |
try { |
104 |
new Phaser(new Phaser(), maxParties + 1); |
105 |
shouldThrow(); |
106 |
} catch (IllegalArgumentException success) {} |
107 |
} |
108 |
|
109 |
/** |
110 |
* The parent provided to the constructor should be returned from |
111 |
* a later call to getParent |
112 |
*/ |
113 |
public void testConstructor3() { |
114 |
Phaser parent = new Phaser(); |
115 |
assertSame(parent, new Phaser(parent).getParent()); |
116 |
assertNull(new Phaser(null).getParent()); |
117 |
} |
118 |
|
119 |
/** |
120 |
* The parent being input into the parameter should equal the original |
121 |
* parent when being returned |
122 |
*/ |
123 |
public void testConstructor5() { |
124 |
Phaser parent = new Phaser(); |
125 |
assertSame(parent, new Phaser(parent, 0).getParent()); |
126 |
assertNull(new Phaser(null, 0).getParent()); |
127 |
} |
128 |
|
129 |
/** |
130 |
* register() will increment the number of unarrived parties by |
131 |
* one and not affect its arrived parties |
132 |
*/ |
133 |
public void testRegister1() { |
134 |
Phaser phaser = new Phaser(); |
135 |
assertState(phaser, 0, 0, 0); |
136 |
assertEquals(0, phaser.register()); |
137 |
assertState(phaser, 0, 1, 1); |
138 |
} |
139 |
|
140 |
/** |
141 |
* Registering more than 65536 parties causes IllegalStateException |
142 |
*/ |
143 |
public void testRegister2() { |
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Phaser phaser = new Phaser(0); |
145 |
assertState(phaser, 0, 0, 0); |
146 |
assertEquals(0, phaser.bulkRegister(maxParties - 10)); |
147 |
assertState(phaser, 0, maxParties - 10, maxParties - 10); |
148 |
for (int i = 0; i < 10; i++) { |
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assertState(phaser, 0, maxParties - 10 + i, maxParties - 10 + i); |
150 |
assertEquals(0, phaser.register()); |
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} |
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assertState(phaser, 0, maxParties, maxParties); |
153 |
try { |
154 |
phaser.register(); |
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shouldThrow(); |
156 |
} catch (IllegalStateException success) {} |
157 |
|
158 |
try { |
159 |
phaser.bulkRegister(Integer.MAX_VALUE); |
160 |
shouldThrow(); |
161 |
} catch (IllegalStateException success) {} |
162 |
} |
163 |
|
164 |
/** |
165 |
* register() correctly returns the current barrier phase number when |
166 |
* invoked |
167 |
*/ |
168 |
public void testRegister3() { |
169 |
Phaser phaser = new Phaser(); |
170 |
assertEquals(0, phaser.register()); |
171 |
assertEquals(0, phaser.arrive()); |
172 |
assertEquals(1, phaser.register()); |
173 |
assertState(phaser, 1, 2, 2); |
174 |
} |
175 |
|
176 |
/** |
177 |
* register causes the next arrive to not increment the phase rather retain |
178 |
* the phase number |
179 |
*/ |
180 |
public void testRegister4() { |
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Phaser phaser = new Phaser(1); |
182 |
assertEquals(0, phaser.arrive()); |
183 |
assertEquals(1, phaser.register()); |
184 |
assertEquals(1, phaser.arrive()); |
185 |
assertState(phaser, 1, 2, 1); |
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} |
187 |
|
188 |
/** |
189 |
* Invoking bulkRegister with a negative parameter throws an |
190 |
* IllegalArgumentException |
191 |
*/ |
192 |
public void testBulkRegister1() { |
193 |
try { |
194 |
new Phaser().bulkRegister(-1); |
195 |
shouldThrow(); |
196 |
} catch (IllegalArgumentException success) {} |
197 |
} |
198 |
|
199 |
/** |
200 |
* bulkRegister should correctly record the number of unarrived parties with |
201 |
* the number of parties being registered |
202 |
*/ |
203 |
public void testBulkRegister2() { |
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Phaser phaser = new Phaser(); |
205 |
assertEquals(0, phaser.bulkRegister(20)); |
206 |
assertState(phaser, 0, 20, 20); |
207 |
} |
208 |
|
209 |
/** |
210 |
* Registering with a number of parties greater than or equal to 1<<16 |
211 |
* throws IllegalStateException. |
212 |
*/ |
213 |
public void testBulkRegister3() { |
214 |
assertEquals(0, new Phaser().bulkRegister((1 << 16) - 1)); |
215 |
|
216 |
try { |
217 |
new Phaser().bulkRegister(1 << 16); |
218 |
shouldThrow(); |
219 |
} catch (IllegalStateException success) {} |
220 |
|
221 |
try { |
222 |
new Phaser(2).bulkRegister((1 << 16) - 2); |
223 |
shouldThrow(); |
224 |
} catch (IllegalStateException success) {} |
225 |
} |
226 |
|
227 |
/** |
228 |
* the phase number increments correctly when tripping the barrier |
229 |
*/ |
230 |
public void testPhaseIncrement1() { |
231 |
for (int size = 1; size < nine; size++) { |
232 |
final Phaser phaser = new Phaser(size); |
233 |
for (int index = 0; index <= (1 << size); index++) { |
234 |
int phase = phaser.arrive(); |
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assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
236 |
} |
237 |
} |
238 |
} |
239 |
|
240 |
/** |
241 |
* arrive() on a registered phaser increments phase. |
242 |
*/ |
243 |
public void testArrive1() { |
244 |
Phaser phaser = new Phaser(1); |
245 |
assertState(phaser, 0, 1, 1); |
246 |
assertEquals(0, phaser.arrive()); |
247 |
assertState(phaser, 1, 1, 1); |
248 |
} |
249 |
|
250 |
/** |
251 |
* arriveAndDeregister does not wait for others to arrive at barrier |
252 |
*/ |
253 |
public void testArriveAndDeregister() throws InterruptedException { |
254 |
final Phaser phaser = new Phaser(1); |
255 |
for (int i = 0; i < 10; i++) { |
256 |
assertState(phaser, 0, 1, 1); |
257 |
assertEquals(0, phaser.register()); |
258 |
assertState(phaser, 0, 2, 2); |
259 |
assertEquals(0, phaser.arriveAndDeregister()); |
260 |
assertState(phaser, 0, 1, 1); |
261 |
} |
262 |
assertEquals(0, phaser.arriveAndDeregister()); |
263 |
assertTerminated(phaser, 1); |
264 |
} |
265 |
|
266 |
/** |
267 |
* arriveAndDeregister does not wait for others to arrive at barrier |
268 |
*/ |
269 |
public void testArrive2() throws InterruptedException { |
270 |
final Phaser phaser = new Phaser(); |
271 |
assertEquals(0, phaser.register()); |
272 |
List<Thread> threads = new ArrayList<Thread>(); |
273 |
for (int i = 0; i < 10; i++) { |
274 |
assertEquals(0, phaser.register()); |
275 |
threads.add(newStartedThread(new CheckedRunnable() { |
276 |
public void realRun() throws InterruptedException { |
277 |
assertEquals(0, phaser.arriveAndDeregister()); |
278 |
}})); |
279 |
} |
280 |
|
281 |
for (Thread thread : threads) |
282 |
awaitTermination(thread, LONG_DELAY_MS); |
283 |
assertState(phaser, 0, 1, 1); |
284 |
assertEquals(0, phaser.arrive()); |
285 |
assertState(phaser, 1, 1, 1); |
286 |
} |
287 |
|
288 |
/** |
289 |
* arrive() returns a negative number if the Phaser is terminated |
290 |
*/ |
291 |
public void testArrive3() { |
292 |
Phaser phaser = new Phaser(1); |
293 |
phaser.forceTermination(); |
294 |
assertTerminated(phaser, 0, 1, 1); |
295 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
296 |
assertTrue(phaser.arrive() < 0); |
297 |
assertTrue(phaser.register() < 0); |
298 |
assertTrue(phaser.arriveAndDeregister() < 0); |
299 |
assertTrue(phaser.awaitAdvance(1) < 0); |
300 |
assertTrue(phaser.getPhase() < 0); |
301 |
} |
302 |
|
303 |
/** |
304 |
* arriveAndDeregister() throws IllegalStateException if number of |
305 |
* registered or unarrived parties would become negative |
306 |
*/ |
307 |
public void testArriveAndDeregister1() { |
308 |
try { |
309 |
Phaser phaser = new Phaser(); |
310 |
phaser.arriveAndDeregister(); |
311 |
shouldThrow(); |
312 |
} catch (IllegalStateException success) {} |
313 |
} |
314 |
|
315 |
/** |
316 |
* arriveAndDeregister reduces the number of arrived parties |
317 |
*/ |
318 |
public void testArriveAndDeregister2() { |
319 |
final Phaser phaser = new Phaser(1); |
320 |
assertEquals(0, phaser.register()); |
321 |
assertEquals(0, phaser.arrive()); |
322 |
assertState(phaser, 0, 2, 1); |
323 |
assertEquals(0, phaser.arriveAndDeregister()); |
324 |
assertState(phaser, 1, 1, 1); |
325 |
} |
326 |
|
327 |
/** |
328 |
* arriveAndDeregister arrives at the barrier on a phaser with a parent and |
329 |
* when a deregistration occurs and causes the phaser to have zero parties |
330 |
* its parent will be deregistered as well |
331 |
*/ |
332 |
public void testArriveAndDeregister3() { |
333 |
Phaser parent = new Phaser(); |
334 |
Phaser child = new Phaser(parent); |
335 |
assertState(child, 0, 0, 0); |
336 |
assertState(parent, 0, 0, 0); |
337 |
assertEquals(0, child.register()); |
338 |
assertState(child, 0, 1, 1); |
339 |
assertState(parent, 0, 1, 1); |
340 |
assertEquals(0, child.arriveAndDeregister()); |
341 |
assertTerminated(child, 1); |
342 |
assertTerminated(parent, 1); |
343 |
} |
344 |
|
345 |
/** |
346 |
* arriveAndDeregister deregisters one party from its parent when |
347 |
* the number of parties of child is zero after deregistration |
348 |
*/ |
349 |
public void testArriveAndDeregister4() { |
350 |
Phaser parent = new Phaser(); |
351 |
Phaser child = new Phaser(parent); |
352 |
assertEquals(0, parent.register()); |
353 |
assertEquals(0, child.register()); |
354 |
assertState(child, 0, 1, 1); |
355 |
assertState(parent, 0, 2, 2); |
356 |
assertEquals(0, child.arriveAndDeregister()); |
357 |
assertState(child, 0, 0, 0); |
358 |
assertState(parent, 0, 1, 1); |
359 |
} |
360 |
|
361 |
/** |
362 |
* arriveAndDeregister deregisters one party from its parent when |
363 |
* the number of parties of root is nonzero after deregistration. |
364 |
*/ |
365 |
public void testArriveAndDeregister5() { |
366 |
Phaser root = new Phaser(); |
367 |
Phaser parent = new Phaser(root); |
368 |
Phaser child = new Phaser(parent); |
369 |
assertState(root, 0, 0, 0); |
370 |
assertState(parent, 0, 0, 0); |
371 |
assertState(child, 0, 0, 0); |
372 |
assertEquals(0, child.register()); |
373 |
assertState(root, 0, 1, 1); |
374 |
assertState(parent, 0, 1, 1); |
375 |
assertState(child, 0, 1, 1); |
376 |
assertEquals(0, child.arriveAndDeregister()); |
377 |
assertTerminated(child, 1); |
378 |
assertTerminated(parent, 1); |
379 |
assertTerminated(root, 1); |
380 |
} |
381 |
|
382 |
/** |
383 |
* arriveAndDeregister returns the phase in which it leaves the |
384 |
* phaser in after deregistration |
385 |
*/ |
386 |
public void testArriveAndDeregister6() throws InterruptedException { |
387 |
final Phaser phaser = new Phaser(2); |
388 |
Thread t = newStartedThread(new CheckedRunnable() { |
389 |
public void realRun() { |
390 |
assertEquals(0, phaser.arrive()); |
391 |
}}); |
392 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
393 |
assertState(phaser, 1, 2, 2); |
394 |
assertEquals(1, phaser.arriveAndDeregister()); |
395 |
assertState(phaser, 1, 1, 1); |
396 |
assertEquals(1, phaser.arriveAndDeregister()); |
397 |
assertTerminated(phaser, 2); |
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 |
} |