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 |
/** Checks state of phaser. */ |
29 |
protected void assertState(Phaser phaser, |
30 |
int phase, int parties, int unarrived) { |
31 |
assertEquals(phase, phaser.getPhase()); |
32 |
assertEquals(parties, phaser.getRegisteredParties()); |
33 |
assertEquals(unarrived, phaser.getUnarrivedParties()); |
34 |
assertEquals(parties - unarrived, phaser.getArrivedParties()); |
35 |
assertTrue((phaser.getPhase() >= 0) ^ phaser.isTerminated()); |
36 |
} |
37 |
|
38 |
/** Checks state of terminated phaser. */ |
39 |
protected void assertTerminated(Phaser phaser, int parties, int unarrived) { |
40 |
assertTrue(phaser.isTerminated()); |
41 |
assertTrue(phaser.getPhase() < 0); |
42 |
assertEquals(parties, phaser.getRegisteredParties()); |
43 |
assertEquals(unarrived, phaser.getUnarrivedParties()); |
44 |
assertEquals(parties - unarrived, phaser.getArrivedParties()); |
45 |
} |
46 |
|
47 |
protected void assertTerminated(Phaser phaser) { |
48 |
assertTerminated(phaser, 0, 0); |
49 |
} |
50 |
|
51 |
/** |
52 |
* Empty constructor builds a new Phaser with no parent, no registered |
53 |
* parties and initial phase number of 0 |
54 |
*/ |
55 |
public void testConstructor1() { |
56 |
Phaser phaser = new Phaser(); |
57 |
assertNull(phaser.getParent()); |
58 |
assertEquals(0, phaser.getArrivedParties()); |
59 |
assertEquals(0, phaser.getPhase()); |
60 |
} |
61 |
|
62 |
/** |
63 |
* A negative party number for the constructor throws illegal argument |
64 |
* exception |
65 |
*/ |
66 |
public void testConstructor2() { |
67 |
try { |
68 |
new Phaser(-1); |
69 |
shouldThrow(); |
70 |
} catch (IllegalArgumentException success) {} |
71 |
} |
72 |
|
73 |
/** |
74 |
* The parent being input into the constructor should equal the original |
75 |
* parent when being returned |
76 |
*/ |
77 |
public void testConstructor3() { |
78 |
Phaser parent = new Phaser(); |
79 |
assertEquals(parent, new Phaser(parent).getParent()); |
80 |
} |
81 |
|
82 |
/** |
83 |
* A negative party number for the constructor throws illegal argument |
84 |
* exception |
85 |
*/ |
86 |
public void testConstructor4() { |
87 |
try { |
88 |
new Phaser(new Phaser(), -1); |
89 |
shouldThrow(); |
90 |
} catch (IllegalArgumentException success) {} |
91 |
} |
92 |
|
93 |
/** |
94 |
* The parent being input into the parameter should equal the original |
95 |
* parent when being returned |
96 |
*/ |
97 |
public void testConstructor5() { |
98 |
Phaser parent = new Phaser(); |
99 |
assertEquals(parent, new Phaser(parent, 0).getParent()); |
100 |
} |
101 |
|
102 |
/** |
103 |
* register() will increment the number of unarrived parties by one and not |
104 |
* affect its arrived parties |
105 |
*/ |
106 |
public void testRegister1() { |
107 |
Phaser phaser = new Phaser(); |
108 |
assertState(phaser, 0, 0, 0); |
109 |
assertEquals(0, phaser.register()); |
110 |
assertState(phaser, 0, 1, 1); |
111 |
} |
112 |
|
113 |
/** |
114 |
* Registering more than 65536 parties causes IllegalStateException |
115 |
*/ |
116 |
public void testRegister2() { |
117 |
Phaser phaser = new Phaser(0); |
118 |
int maxParties = (1 << 16) - 1; |
119 |
assertState(phaser, 0, 0, 0); |
120 |
assertEquals(0, phaser.bulkRegister(maxParties - 10)); |
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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); |
124 |
assertEquals(0, phaser.register()); |
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} |
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assertState(phaser, 0, maxParties, maxParties); |
127 |
try { |
128 |
phaser.register(); |
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shouldThrow(); |
130 |
} catch (IllegalStateException success) {} |
131 |
} |
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|
133 |
/** |
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* register() correctly returns the current barrier phase number when |
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* invoked |
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*/ |
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public void testRegister3() { |
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Phaser phaser = new Phaser(); |
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assertEquals(0, phaser.register()); |
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assertEquals(0, phaser.arrive()); |
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assertEquals(1, phaser.register()); |
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assertState(phaser, 1, 2, 2); |
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} |
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|
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/** |
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* register causes the next arrive to not increment the phase rather retain |
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* the phase number |
148 |
*/ |
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public void testRegister4() { |
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Phaser phaser = new Phaser(1); |
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assertEquals(0, phaser.arrive()); |
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assertEquals(1, phaser.register()); |
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assertEquals(1, phaser.arrive()); |
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assertState(phaser, 1, 2, 1); |
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} |
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|
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/** |
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* Invoking bulkRegister with a negative parameter throws an |
159 |
* IllegalArgumentException |
160 |
*/ |
161 |
public void testBulkRegister1() { |
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try { |
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new Phaser().bulkRegister(-1); |
164 |
shouldThrow(); |
165 |
} catch (IllegalArgumentException success) {} |
166 |
} |
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|
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/** |
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* bulkRegister should correctly record the number of unarrived parties with |
170 |
* the number of parties being registered |
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*/ |
172 |
public void testBulkRegister2() { |
173 |
Phaser phaser = new Phaser(); |
174 |
assertEquals(0, phaser.bulkRegister(20)); |
175 |
assertState(phaser, 0, 20, 20); |
176 |
} |
177 |
|
178 |
/** |
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* Registering with a number of parties greater than or equal to 1<<16 |
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* throws IllegalStateException. |
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*/ |
182 |
public void testBulkRegister3() { |
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assertEquals(0, new Phaser().bulkRegister((1 << 16) - 1)); |
184 |
|
185 |
try { |
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new Phaser().bulkRegister(1 << 16); |
187 |
shouldThrow(); |
188 |
} catch (IllegalStateException success) {} |
189 |
|
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try { |
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new Phaser(2).bulkRegister((1 << 16) - 2); |
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shouldThrow(); |
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} catch (IllegalStateException success) {} |
194 |
} |
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|
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/** |
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* the phase number increments correctly when tripping the barrier |
198 |
*/ |
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public void testPhaseIncrement1() { |
200 |
for (int size = 1; size < nine; size++) { |
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final Phaser phaser = new Phaser(size); |
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for (int index = 0; index <= (1 << size); index++) { |
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int phase = phaser.arrive(); |
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assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
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} |
206 |
} |
207 |
} |
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|
209 |
/** |
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* arrive() on a registered phaser increments phase. |
211 |
*/ |
212 |
public void testArrive1() { |
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Phaser phaser = new Phaser(1); |
214 |
assertState(phaser, 0, 1, 1); |
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assertEquals(0, phaser.arrive()); |
216 |
assertState(phaser, 1, 1, 1); |
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} |
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|
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/** |
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* arriveAndDeregister does not wait for others to arrive at barrier |
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*/ |
222 |
public void testArriveAndDeregister() throws InterruptedException { |
223 |
final Phaser phaser = new Phaser(1); |
224 |
for (int i = 0; i < 10; i++) { |
225 |
assertState(phaser, 0, 1, 1); |
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assertEquals(0, phaser.register()); |
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assertState(phaser, 0, 2, 2); |
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assertEquals(0, phaser.arriveAndDeregister()); |
229 |
assertState(phaser, 0, 1, 1); |
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} |
231 |
assertEquals(0, phaser.arriveAndDeregister()); |
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assertTerminated(phaser); |
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} |
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|
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/** |
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* arriveAndDeregister does not wait for others to arrive at barrier |
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*/ |
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public void testArrive2() throws InterruptedException { |
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final Phaser phaser = new Phaser(); |
240 |
assertEquals(0, phaser.register()); |
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List<Thread> threads = new ArrayList<Thread>(); |
242 |
for (int i = 0; i < 10; i++) { |
243 |
assertEquals(0, phaser.register()); |
244 |
threads.add(newStartedThread(new CheckedRunnable() { |
245 |
public void realRun() throws InterruptedException { |
246 |
assertEquals(0, phaser.arriveAndDeregister()); |
247 |
}})); |
248 |
} |
249 |
|
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for (Thread thread : threads) |
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awaitTermination(thread, LONG_DELAY_MS); |
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assertState(phaser, 0, 1, 1); |
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assertEquals(0, phaser.arrive()); |
254 |
assertState(phaser, 1, 1, 1); |
255 |
} |
256 |
|
257 |
/** |
258 |
* arrive() returns a negative number if the Phaser is terminated |
259 |
*/ |
260 |
public void testArrive3() { |
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Phaser phaser = new Phaser(1); |
262 |
phaser.forceTermination(); |
263 |
assertTerminated(phaser, 1, 1); |
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assertTrue(phaser.arrive() < 0); |
265 |
assertTrue(phaser.register() < 0); |
266 |
assertTrue(phaser.arriveAndDeregister() < 0); |
267 |
assertTrue(phaser.awaitAdvance(1) < 0); |
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assertTrue(phaser.getPhase() < 0); |
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} |
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|
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/** |
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* arriveAndDeregister() throws IllegalStateException if number of |
273 |
* registered or unarrived parties would become negative |
274 |
*/ |
275 |
public void testArriveAndDeregister1() { |
276 |
try { |
277 |
Phaser phaser = new Phaser(); |
278 |
phaser.arriveAndDeregister(); |
279 |
shouldThrow(); |
280 |
} catch (IllegalStateException success) {} |
281 |
} |
282 |
|
283 |
/** |
284 |
* arriveAndDeregister reduces the number of arrived parties |
285 |
*/ |
286 |
public void testArriveAndDeregister2() { |
287 |
final Phaser phaser = new Phaser(1); |
288 |
assertEquals(0, phaser.register()); |
289 |
assertEquals(0, phaser.arrive()); |
290 |
assertState(phaser, 0, 2, 1); |
291 |
assertEquals(0, phaser.arriveAndDeregister()); |
292 |
assertState(phaser, 1, 1, 1); |
293 |
} |
294 |
|
295 |
/** |
296 |
* arriveAndDeregister arrives at the barrier on a phaser with a parent and |
297 |
* when a deregistration occurs and causes the phaser to have zero parties |
298 |
* its parent will be deregistered as well |
299 |
*/ |
300 |
public void testArriveAndDeregister3() { |
301 |
Phaser parent = new Phaser(); |
302 |
Phaser child = new Phaser(parent); |
303 |
assertState(child, 0, 0, 0); |
304 |
assertState(parent, 0, 1, 1); |
305 |
assertEquals(0, child.register()); |
306 |
assertState(child, 0, 1, 1); |
307 |
assertState(parent, 0, 1, 1); |
308 |
assertEquals(0, child.arriveAndDeregister()); |
309 |
assertTerminated(child); |
310 |
assertTerminated(parent); |
311 |
} |
312 |
|
313 |
/** |
314 |
* arriveAndDeregister deregisters one party from its parent when |
315 |
* the number of parties of child is zero after deregistration |
316 |
*/ |
317 |
public void testArriveAndDeregister4() { |
318 |
Phaser parent = new Phaser(); |
319 |
Phaser child = new Phaser(parent); |
320 |
assertEquals(0, parent.register()); |
321 |
assertEquals(0, child.register()); |
322 |
assertState(child, 0, 1, 1); |
323 |
assertState(parent, 0, 2, 2); |
324 |
assertEquals(0, child.arriveAndDeregister()); |
325 |
assertState(child, 0, 0, 0); |
326 |
assertState(parent, 0, 1, 1); |
327 |
} |
328 |
|
329 |
/** |
330 |
* arriveAndDeregister deregisters one party from its parent when |
331 |
* the number of parties of root is nonzero after deregistration. |
332 |
*/ |
333 |
public void testArriveAndDeregister5() { |
334 |
Phaser root = new Phaser(); |
335 |
Phaser parent = new Phaser(root); |
336 |
Phaser child = new Phaser(parent); |
337 |
assertState(root, 0, 1, 1); |
338 |
assertState(parent, 0, 1, 1); |
339 |
assertState(child, 0, 0, 0); |
340 |
assertEquals(0, child.register()); |
341 |
assertState(root, 0, 1, 1); |
342 |
assertState(parent, 0, 1, 1); |
343 |
assertState(child, 0, 1, 1); |
344 |
assertEquals(0, child.arriveAndDeregister()); |
345 |
assertTerminated(child); |
346 |
assertTerminated(parent); |
347 |
assertTerminated(root); |
348 |
} |
349 |
|
350 |
/** |
351 |
* arriveAndDeregister returns the phase in which it leaves the |
352 |
* phaser in after deregistration |
353 |
*/ |
354 |
public void testArriveAndDeregister6() throws InterruptedException { |
355 |
final Phaser phaser = new Phaser(2); |
356 |
Thread t = newStartedThread(new CheckedRunnable() { |
357 |
public void realRun() { |
358 |
assertEquals(0, phaser.arrive()); |
359 |
}}); |
360 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
361 |
assertState(phaser, 1, 2, 2); |
362 |
assertEquals(1, phaser.arriveAndDeregister()); |
363 |
assertState(phaser, 1, 1, 1); |
364 |
assertEquals(1, phaser.arriveAndDeregister()); |
365 |
assertTerminated(phaser); |
366 |
awaitTermination(t, SHORT_DELAY_MS); |
367 |
} |
368 |
|
369 |
/** |
370 |
* awaitAdvance succeeds upon advance |
371 |
*/ |
372 |
public void testAwaitAdvance1() { |
373 |
final Phaser phaser = new Phaser(1); |
374 |
assertEquals(0, phaser.arrive()); |
375 |
assertEquals(1, phaser.awaitAdvance(0)); |
376 |
} |
377 |
|
378 |
/** |
379 |
* awaitAdvance with a negative parameter will return without affecting the |
380 |
* phaser |
381 |
*/ |
382 |
public void testAwaitAdvance2() { |
383 |
Phaser phaser = new Phaser(); |
384 |
assertTrue(phaser.awaitAdvance(-1) < 0); |
385 |
assertState(phaser, 0, 0, 0); |
386 |
} |
387 |
|
388 |
/** |
389 |
* awaitAdvance continues waiting if interrupted |
390 |
*/ |
391 |
public void testAwaitAdvance3() throws InterruptedException { |
392 |
final Phaser phaser = new Phaser(); |
393 |
assertEquals(0, phaser.register()); |
394 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
395 |
|
396 |
Thread t = newStartedThread(new CheckedRunnable() { |
397 |
public void realRun() throws InterruptedException { |
398 |
assertEquals(0, phaser.register()); |
399 |
threadStarted.countDown(); |
400 |
assertEquals(1, phaser.awaitAdvance(phaser.arrive())); |
401 |
assertTrue(Thread.currentThread().isInterrupted()); |
402 |
}}); |
403 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
404 |
t.interrupt(); |
405 |
assertEquals(0, phaser.arrive()); |
406 |
awaitTermination(t, SMALL_DELAY_MS); |
407 |
} |
408 |
|
409 |
/** |
410 |
* awaitAdvance atomically waits for all parties within the same phase to |
411 |
* complete before continuing |
412 |
*/ |
413 |
public void testAwaitAdvance4() throws InterruptedException { |
414 |
final Phaser phaser = new Phaser(4); |
415 |
final AtomicInteger count = new AtomicInteger(0); |
416 |
List<Thread> threads = new ArrayList<Thread>(); |
417 |
for (int i = 0; i < 4; i++) |
418 |
threads.add(newStartedThread(new CheckedRunnable() { |
419 |
public void realRun() { |
420 |
for (int k = 0; k < 3; k++) { |
421 |
assertEquals(2*k+1, phaser.arriveAndAwaitAdvance()); |
422 |
count.incrementAndGet(); |
423 |
assertEquals(2*k+1, phaser.arrive()); |
424 |
assertEquals(2*k+2, phaser.awaitAdvance(2*k+1)); |
425 |
assertEquals(count.get(), 4*(k+1)); |
426 |
}}})); |
427 |
|
428 |
for (Thread thread : threads) |
429 |
awaitTermination(thread, MEDIUM_DELAY_MS); |
430 |
} |
431 |
|
432 |
/** |
433 |
* awaitAdvance returns the current phase |
434 |
*/ |
435 |
public void testAwaitAdvance5() throws InterruptedException { |
436 |
final Phaser phaser = new Phaser(1); |
437 |
assertEquals(1, phaser.awaitAdvance(phaser.arrive())); |
438 |
assertEquals(1, phaser.getPhase()); |
439 |
assertEquals(1, phaser.register()); |
440 |
List<Thread> threads = new ArrayList<Thread>(); |
441 |
for (int i = 0; i < 8; i++) { |
442 |
final CountDownLatch latch = new CountDownLatch(1); |
443 |
final boolean goesFirst = ((i & 1) == 0); |
444 |
threads.add(newStartedThread(new CheckedRunnable() { |
445 |
public void realRun() throws InterruptedException { |
446 |
if (goesFirst) |
447 |
latch.countDown(); |
448 |
else |
449 |
assertTrue(latch.await(SMALL_DELAY_MS, MILLISECONDS)); |
450 |
phaser.arrive(); |
451 |
}})); |
452 |
if (goesFirst) |
453 |
assertTrue(latch.await(SMALL_DELAY_MS, MILLISECONDS)); |
454 |
else |
455 |
latch.countDown(); |
456 |
assertEquals(i + 2, phaser.awaitAdvance(phaser.arrive())); |
457 |
assertEquals(i + 2, phaser.getPhase()); |
458 |
} |
459 |
for (Thread thread : threads) |
460 |
awaitTermination(thread, SMALL_DELAY_MS); |
461 |
} |
462 |
|
463 |
/** |
464 |
* awaitAdvance returns when the phaser is externally terminated |
465 |
*/ |
466 |
public void testAwaitAdvance6() throws InterruptedException { |
467 |
final Phaser phaser = new Phaser(3); |
468 |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
469 |
final List<Thread> threads = new ArrayList<Thread>(); |
470 |
for (int i = 0; i < 2; i++) { |
471 |
Runnable r = new CheckedRunnable() { |
472 |
public void realRun() { |
473 |
assertEquals(0, phaser.arrive()); |
474 |
threadsStarted.countDown(); |
475 |
assertTrue(phaser.awaitAdvance(0) < 0); |
476 |
assertTrue(phaser.isTerminated()); |
477 |
assertTrue(phaser.getPhase() < 0); |
478 |
assertEquals(3, phaser.getRegisteredParties()); |
479 |
}}; |
480 |
threads.add(newStartedThread(r)); |
481 |
} |
482 |
threadsStarted.await(); |
483 |
phaser.forceTermination(); |
484 |
for (Thread thread : threads) |
485 |
awaitTermination(thread, SMALL_DELAY_MS); |
486 |
assertTrue(phaser.isTerminated()); |
487 |
assertTrue(phaser.getPhase() < 0); |
488 |
assertEquals(3, phaser.getRegisteredParties()); |
489 |
} |
490 |
|
491 |
/** |
492 |
* arriveAndAwaitAdvance throws IllegalStateException with no |
493 |
* unarrived parties |
494 |
*/ |
495 |
public void testArriveAndAwaitAdvance1() { |
496 |
try { |
497 |
Phaser phaser = new Phaser(); |
498 |
phaser.arriveAndAwaitAdvance(); |
499 |
shouldThrow(); |
500 |
} catch (IllegalStateException success) {} |
501 |
} |
502 |
|
503 |
/** |
504 |
* Interrupted arriveAndAwaitAdvance does not throw InterruptedException |
505 |
*/ |
506 |
public void testArriveAndAwaitAdvance2() throws InterruptedException { |
507 |
final Phaser phaser = new Phaser(2); |
508 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
509 |
final AtomicBoolean advanced = new AtomicBoolean(false); |
510 |
final AtomicBoolean checkedInterruptStatus = new AtomicBoolean(false); |
511 |
Thread t = newStartedThread(new CheckedRunnable() { |
512 |
public void realRun() throws InterruptedException { |
513 |
threadStarted.countDown(); |
514 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
515 |
assertState(phaser, 1, 2, 2); |
516 |
advanced.set(true); |
517 |
assertTrue(Thread.currentThread().isInterrupted()); |
518 |
while (!checkedInterruptStatus.get()) |
519 |
Thread.yield(); |
520 |
}}); |
521 |
|
522 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
523 |
t.interrupt(); |
524 |
assertEquals(0, phaser.arrive()); |
525 |
while (!advanced.get()) |
526 |
Thread.yield(); |
527 |
assertTrue(t.isInterrupted()); |
528 |
checkedInterruptStatus.set(true); |
529 |
awaitTermination(t, SMALL_DELAY_MS); |
530 |
} |
531 |
|
532 |
/** |
533 |
* arriveAndAwaitAdvance waits for all threads to arrive, the |
534 |
* number of arrived parties is the same number that is accounted |
535 |
* for when the main thread awaitsAdvance |
536 |
*/ |
537 |
public void testArriveAndAwaitAdvance3() throws InterruptedException { |
538 |
final Phaser phaser = new Phaser(1); |
539 |
final int THREADS = 3; |
540 |
final CountDownLatch threadsStarted = new CountDownLatch(THREADS); |
541 |
final List<Thread> threads = new ArrayList<Thread>(); |
542 |
for (int i = 0; i < THREADS; i++) |
543 |
threads.add(newStartedThread(new CheckedRunnable() { |
544 |
public void realRun() throws InterruptedException { |
545 |
assertEquals(0, phaser.register()); |
546 |
threadsStarted.countDown(); |
547 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
548 |
}})); |
549 |
|
550 |
assertTrue(threadsStarted.await(MEDIUM_DELAY_MS, MILLISECONDS)); |
551 |
long t0 = System.nanoTime(); |
552 |
while (phaser.getArrivedParties() < THREADS) |
553 |
Thread.yield(); |
554 |
assertEquals(THREADS, phaser.getArrivedParties()); |
555 |
assertTrue(NANOSECONDS.toMillis(System.nanoTime() - t0) < SMALL_DELAY_MS); |
556 |
for (Thread thread : threads) |
557 |
assertTrue(thread.isAlive()); |
558 |
assertState(phaser, 0, THREADS + 1, 1); |
559 |
phaser.arriveAndAwaitAdvance(); |
560 |
for (Thread thread : threads) |
561 |
awaitTermination(thread, SMALL_DELAY_MS); |
562 |
assertState(phaser, 1, THREADS + 1, THREADS + 1); |
563 |
} |
564 |
|
565 |
} |