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 |
|
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import junit.framework.*; |
10 |
import java.util.concurrent.locks.*; |
11 |
import java.util.concurrent.*; |
12 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
13 |
import java.util.*; |
14 |
import java.io.*; |
15 |
|
16 |
public class ReentrantLockTest extends JSR166TestCase { |
17 |
public static void main(String[] args) { |
18 |
junit.textui.TestRunner.run(suite()); |
19 |
} |
20 |
public static Test suite() { |
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return new TestSuite(ReentrantLockTest.class); |
22 |
} |
23 |
|
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/** |
25 |
* A runnable calling lockInterruptibly |
26 |
*/ |
27 |
class InterruptibleLockRunnable extends CheckedRunnable { |
28 |
final ReentrantLock lock; |
29 |
InterruptibleLockRunnable(ReentrantLock l) { lock = l; } |
30 |
public void realRun() throws InterruptedException { |
31 |
lock.lockInterruptibly(); |
32 |
} |
33 |
} |
34 |
|
35 |
|
36 |
/** |
37 |
* A runnable calling lockInterruptibly that expects to be |
38 |
* interrupted |
39 |
*/ |
40 |
class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
41 |
final ReentrantLock lock; |
42 |
InterruptedLockRunnable(ReentrantLock l) { lock = l; } |
43 |
public void realRun() throws InterruptedException { |
44 |
lock.lockInterruptibly(); |
45 |
} |
46 |
} |
47 |
|
48 |
/** |
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* Subclass to expose protected methods |
50 |
*/ |
51 |
static class PublicReentrantLock extends ReentrantLock { |
52 |
PublicReentrantLock() { super(); } |
53 |
public Collection<Thread> getQueuedThreads() { |
54 |
return super.getQueuedThreads(); |
55 |
} |
56 |
public Collection<Thread> getWaitingThreads(Condition c) { |
57 |
return super.getWaitingThreads(c); |
58 |
} |
59 |
} |
60 |
|
61 |
/** |
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* Constructor sets given fairness |
63 |
*/ |
64 |
public void testConstructor() { |
65 |
assertFalse(new ReentrantLock().isFair()); |
66 |
assertFalse(new ReentrantLock(false).isFair()); |
67 |
assertTrue(new ReentrantLock(true).isFair()); |
68 |
} |
69 |
|
70 |
/** |
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* locking an unlocked lock succeeds |
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*/ |
73 |
public void testLock() { |
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ReentrantLock rl = new ReentrantLock(); |
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rl.lock(); |
76 |
assertTrue(rl.isLocked()); |
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rl.unlock(); |
78 |
assertFalse(rl.isLocked()); |
79 |
} |
80 |
|
81 |
/** |
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* locking an unlocked fair lock succeeds |
83 |
*/ |
84 |
public void testFairLock() { |
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ReentrantLock rl = new ReentrantLock(true); |
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rl.lock(); |
87 |
assertTrue(rl.isLocked()); |
88 |
rl.unlock(); |
89 |
} |
90 |
|
91 |
/** |
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* Unlocking an unlocked lock throws IllegalMonitorStateException |
93 |
*/ |
94 |
public void testUnlock_IllegalMonitorStateException() { |
95 |
ReentrantLock rl = new ReentrantLock(); |
96 |
try { |
97 |
rl.unlock(); |
98 |
shouldThrow(); |
99 |
} catch (IllegalMonitorStateException success) {} |
100 |
} |
101 |
|
102 |
/** |
103 |
* tryLock on an unlocked lock succeeds |
104 |
*/ |
105 |
public void testTryLock() { |
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ReentrantLock rl = new ReentrantLock(); |
107 |
assertTrue(rl.tryLock()); |
108 |
assertTrue(rl.isLocked()); |
109 |
rl.unlock(); |
110 |
} |
111 |
|
112 |
|
113 |
/** |
114 |
* hasQueuedThreads reports whether there are waiting threads |
115 |
*/ |
116 |
public void testhasQueuedThreads() throws InterruptedException { |
117 |
final ReentrantLock lock = new ReentrantLock(); |
118 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
119 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
120 |
assertFalse(lock.hasQueuedThreads()); |
121 |
lock.lock(); |
122 |
t1.start(); |
123 |
delay(SHORT_DELAY_MS); |
124 |
assertTrue(lock.hasQueuedThreads()); |
125 |
t2.start(); |
126 |
delay(SHORT_DELAY_MS); |
127 |
assertTrue(lock.hasQueuedThreads()); |
128 |
t1.interrupt(); |
129 |
delay(SHORT_DELAY_MS); |
130 |
assertTrue(lock.hasQueuedThreads()); |
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lock.unlock(); |
132 |
delay(SHORT_DELAY_MS); |
133 |
assertFalse(lock.hasQueuedThreads()); |
134 |
awaitTermination(t1); |
135 |
awaitTermination(t2); |
136 |
} |
137 |
|
138 |
/** |
139 |
* getQueueLength reports number of waiting threads |
140 |
*/ |
141 |
public void testGetQueueLength() throws InterruptedException { |
142 |
final ReentrantLock lock = new ReentrantLock(); |
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Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
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Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
145 |
assertEquals(0, lock.getQueueLength()); |
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lock.lock(); |
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t1.start(); |
148 |
delay(SHORT_DELAY_MS); |
149 |
assertEquals(1, lock.getQueueLength()); |
150 |
t2.start(); |
151 |
delay(SHORT_DELAY_MS); |
152 |
assertEquals(2, lock.getQueueLength()); |
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t1.interrupt(); |
154 |
delay(SHORT_DELAY_MS); |
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assertEquals(1, lock.getQueueLength()); |
156 |
lock.unlock(); |
157 |
delay(SHORT_DELAY_MS); |
158 |
assertEquals(0, lock.getQueueLength()); |
159 |
awaitTermination(t1); |
160 |
awaitTermination(t2); |
161 |
} |
162 |
|
163 |
/** |
164 |
* getQueueLength reports number of waiting threads |
165 |
*/ |
166 |
public void testGetQueueLength_fair() throws InterruptedException { |
167 |
final ReentrantLock lock = new ReentrantLock(true); |
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Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
169 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
170 |
assertEquals(0, lock.getQueueLength()); |
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lock.lock(); |
172 |
t1.start(); |
173 |
delay(SHORT_DELAY_MS); |
174 |
assertEquals(1, lock.getQueueLength()); |
175 |
t2.start(); |
176 |
delay(SHORT_DELAY_MS); |
177 |
assertEquals(2, lock.getQueueLength()); |
178 |
t1.interrupt(); |
179 |
delay(SHORT_DELAY_MS); |
180 |
assertEquals(1, lock.getQueueLength()); |
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lock.unlock(); |
182 |
delay(SHORT_DELAY_MS); |
183 |
assertEquals(0, lock.getQueueLength()); |
184 |
awaitTermination(t1); |
185 |
awaitTermination(t2); |
186 |
} |
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|
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/** |
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* hasQueuedThread(null) throws NPE |
190 |
*/ |
191 |
public void testHasQueuedThreadNPE() { |
192 |
final ReentrantLock sync = new ReentrantLock(); |
193 |
try { |
194 |
sync.hasQueuedThread(null); |
195 |
shouldThrow(); |
196 |
} catch (NullPointerException success) {} |
197 |
} |
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|
199 |
/** |
200 |
* hasQueuedThread reports whether a thread is queued. |
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*/ |
202 |
public void testHasQueuedThread() throws InterruptedException { |
203 |
final ReentrantLock sync = new ReentrantLock(); |
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Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
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Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
206 |
assertFalse(sync.hasQueuedThread(t1)); |
207 |
assertFalse(sync.hasQueuedThread(t2)); |
208 |
sync.lock(); |
209 |
t1.start(); |
210 |
delay(SHORT_DELAY_MS); |
211 |
assertTrue(sync.hasQueuedThread(t1)); |
212 |
t2.start(); |
213 |
delay(SHORT_DELAY_MS); |
214 |
assertTrue(sync.hasQueuedThread(t1)); |
215 |
assertTrue(sync.hasQueuedThread(t2)); |
216 |
t1.interrupt(); |
217 |
delay(SHORT_DELAY_MS); |
218 |
assertFalse(sync.hasQueuedThread(t1)); |
219 |
assertTrue(sync.hasQueuedThread(t2)); |
220 |
sync.unlock(); |
221 |
delay(SHORT_DELAY_MS); |
222 |
assertFalse(sync.hasQueuedThread(t1)); |
223 |
delay(SHORT_DELAY_MS); |
224 |
assertFalse(sync.hasQueuedThread(t2)); |
225 |
awaitTermination(t1); |
226 |
awaitTermination(t2); |
227 |
} |
228 |
|
229 |
|
230 |
/** |
231 |
* getQueuedThreads includes waiting threads |
232 |
*/ |
233 |
public void testGetQueuedThreads() throws InterruptedException { |
234 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
235 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
236 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
237 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
238 |
lock.lock(); |
239 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
240 |
t1.start(); |
241 |
delay(SHORT_DELAY_MS); |
242 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
243 |
t2.start(); |
244 |
delay(SHORT_DELAY_MS); |
245 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
246 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
247 |
t1.interrupt(); |
248 |
delay(SHORT_DELAY_MS); |
249 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
250 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
251 |
lock.unlock(); |
252 |
delay(SHORT_DELAY_MS); |
253 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
254 |
awaitTermination(t1); |
255 |
awaitTermination(t2); |
256 |
} |
257 |
|
258 |
|
259 |
/** |
260 |
* timed tryLock is interruptible. |
261 |
*/ |
262 |
public void testInterruptedException2() throws InterruptedException { |
263 |
final ReentrantLock lock = new ReentrantLock(); |
264 |
lock.lock(); |
265 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
266 |
public void realRun() throws InterruptedException { |
267 |
lock.tryLock(MEDIUM_DELAY_MS,MILLISECONDS); |
268 |
}}); |
269 |
|
270 |
delay(SHORT_DELAY_MS); |
271 |
t.interrupt(); |
272 |
awaitTermination(t); |
273 |
} |
274 |
|
275 |
|
276 |
/** |
277 |
* TryLock on a locked lock fails |
278 |
*/ |
279 |
public void testTryLockWhenLocked() throws InterruptedException { |
280 |
final ReentrantLock lock = new ReentrantLock(); |
281 |
lock.lock(); |
282 |
Thread t = newStartedThread(new CheckedRunnable() { |
283 |
public void realRun() { |
284 |
assertFalse(lock.tryLock()); |
285 |
}}); |
286 |
|
287 |
awaitTermination(t); |
288 |
lock.unlock(); |
289 |
} |
290 |
|
291 |
/** |
292 |
* Timed tryLock on a locked lock times out |
293 |
*/ |
294 |
public void testTryLock_Timeout() throws InterruptedException { |
295 |
final ReentrantLock lock = new ReentrantLock(); |
296 |
lock.lock(); |
297 |
Thread t = newStartedThread(new CheckedRunnable() { |
298 |
public void realRun() throws InterruptedException { |
299 |
assertFalse(lock.tryLock(1, MILLISECONDS)); |
300 |
}}); |
301 |
|
302 |
awaitTermination(t); |
303 |
lock.unlock(); |
304 |
} |
305 |
|
306 |
/** |
307 |
* getHoldCount returns number of recursive holds |
308 |
*/ |
309 |
public void testGetHoldCount() { |
310 |
ReentrantLock lock = new ReentrantLock(); |
311 |
for (int i = 1; i <= SIZE; i++) { |
312 |
lock.lock(); |
313 |
assertEquals(i, lock.getHoldCount()); |
314 |
} |
315 |
for (int i = SIZE; i > 0; i--) { |
316 |
lock.unlock(); |
317 |
assertEquals(i-1, lock.getHoldCount()); |
318 |
} |
319 |
} |
320 |
|
321 |
|
322 |
/** |
323 |
* isLocked is true when locked and false when not |
324 |
*/ |
325 |
public void testIsLocked() throws InterruptedException { |
326 |
final ReentrantLock lock = new ReentrantLock(); |
327 |
lock.lock(); |
328 |
assertTrue(lock.isLocked()); |
329 |
lock.unlock(); |
330 |
assertFalse(lock.isLocked()); |
331 |
Thread t = newStartedThread(new CheckedRunnable() { |
332 |
public void realRun() throws InterruptedException { |
333 |
lock.lock(); |
334 |
delay(SMALL_DELAY_MS); |
335 |
lock.unlock(); |
336 |
}}); |
337 |
|
338 |
delay(SHORT_DELAY_MS); |
339 |
assertTrue(lock.isLocked()); |
340 |
awaitTermination(t); |
341 |
assertFalse(lock.isLocked()); |
342 |
} |
343 |
|
344 |
|
345 |
/** |
346 |
* lockInterruptibly is interruptible. |
347 |
*/ |
348 |
public void testLockInterruptibly1() throws InterruptedException { |
349 |
final ReentrantLock lock = new ReentrantLock(); |
350 |
lock.lock(); |
351 |
Thread t = newStartedThread(new InterruptedLockRunnable(lock)); |
352 |
delay(SHORT_DELAY_MS); |
353 |
t.interrupt(); |
354 |
delay(SHORT_DELAY_MS); |
355 |
lock.unlock(); |
356 |
awaitTermination(t); |
357 |
} |
358 |
|
359 |
/** |
360 |
* lockInterruptibly succeeds when unlocked, else is interruptible |
361 |
*/ |
362 |
public void testLockInterruptibly2() throws InterruptedException { |
363 |
final ReentrantLock lock = new ReentrantLock(); |
364 |
lock.lockInterruptibly(); |
365 |
Thread t = newStartedThread(new InterruptedLockRunnable(lock)); |
366 |
delay(SHORT_DELAY_MS); |
367 |
t.interrupt(); |
368 |
assertTrue(lock.isLocked()); |
369 |
assertTrue(lock.isHeldByCurrentThread()); |
370 |
awaitTermination(t); |
371 |
} |
372 |
|
373 |
/** |
374 |
* Calling await without holding lock throws IllegalMonitorStateException |
375 |
*/ |
376 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
377 |
final ReentrantLock lock = new ReentrantLock(); |
378 |
final Condition c = lock.newCondition(); |
379 |
try { |
380 |
c.await(); |
381 |
shouldThrow(); |
382 |
} catch (IllegalMonitorStateException success) {} |
383 |
} |
384 |
|
385 |
/** |
386 |
* Calling signal without holding lock throws IllegalMonitorStateException |
387 |
*/ |
388 |
public void testSignal_IllegalMonitor() { |
389 |
final ReentrantLock lock = new ReentrantLock(); |
390 |
final Condition c = lock.newCondition(); |
391 |
try { |
392 |
c.signal(); |
393 |
shouldThrow(); |
394 |
} catch (IllegalMonitorStateException success) {} |
395 |
} |
396 |
|
397 |
/** |
398 |
* awaitNanos without a signal times out |
399 |
*/ |
400 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
401 |
final ReentrantLock lock = new ReentrantLock(); |
402 |
final Condition c = lock.newCondition(); |
403 |
lock.lock(); |
404 |
long t = c.awaitNanos(100); |
405 |
assertTrue(t <= 0); |
406 |
lock.unlock(); |
407 |
} |
408 |
|
409 |
/** |
410 |
* timed await without a signal times out |
411 |
*/ |
412 |
public void testAwait_Timeout() throws InterruptedException { |
413 |
final ReentrantLock lock = new ReentrantLock(); |
414 |
final Condition c = lock.newCondition(); |
415 |
lock.lock(); |
416 |
assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS)); |
417 |
lock.unlock(); |
418 |
} |
419 |
|
420 |
/** |
421 |
* awaitUntil without a signal times out |
422 |
*/ |
423 |
public void testAwaitUntil_Timeout() throws InterruptedException { |
424 |
final ReentrantLock lock = new ReentrantLock(); |
425 |
final Condition c = lock.newCondition(); |
426 |
lock.lock(); |
427 |
java.util.Date d = new java.util.Date(); |
428 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
429 |
lock.unlock(); |
430 |
} |
431 |
|
432 |
/** |
433 |
* await returns when signalled |
434 |
*/ |
435 |
public void testAwait() throws InterruptedException { |
436 |
final ReentrantLock lock = new ReentrantLock(); |
437 |
final Condition c = lock.newCondition(); |
438 |
Thread t = newStartedThread(new CheckedRunnable() { |
439 |
public void realRun() throws InterruptedException { |
440 |
lock.lock(); |
441 |
c.await(); |
442 |
lock.unlock(); |
443 |
}}); |
444 |
|
445 |
delay(SHORT_DELAY_MS); |
446 |
lock.lock(); |
447 |
c.signal(); |
448 |
lock.unlock(); |
449 |
awaitTermination(t); |
450 |
} |
451 |
|
452 |
/** |
453 |
* hasWaiters throws NPE if null |
454 |
*/ |
455 |
public void testHasWaitersNPE() { |
456 |
final ReentrantLock lock = new ReentrantLock(); |
457 |
try { |
458 |
lock.hasWaiters(null); |
459 |
shouldThrow(); |
460 |
} catch (NullPointerException success) {} |
461 |
} |
462 |
|
463 |
/** |
464 |
* getWaitQueueLength throws NPE if null |
465 |
*/ |
466 |
public void testGetWaitQueueLengthNPE() { |
467 |
final ReentrantLock lock = new ReentrantLock(); |
468 |
try { |
469 |
lock.getWaitQueueLength(null); |
470 |
shouldThrow(); |
471 |
} catch (NullPointerException success) {} |
472 |
} |
473 |
|
474 |
|
475 |
/** |
476 |
* getWaitingThreads throws NPE if null |
477 |
*/ |
478 |
public void testGetWaitingThreadsNPE() { |
479 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
480 |
try { |
481 |
lock.getWaitingThreads(null); |
482 |
shouldThrow(); |
483 |
} catch (NullPointerException success) {} |
484 |
} |
485 |
|
486 |
|
487 |
/** |
488 |
* hasWaiters throws IAE if not owned |
489 |
*/ |
490 |
public void testHasWaitersIAE() { |
491 |
final ReentrantLock lock = new ReentrantLock(); |
492 |
final Condition c = lock.newCondition(); |
493 |
final ReentrantLock lock2 = new ReentrantLock(); |
494 |
try { |
495 |
lock2.hasWaiters(c); |
496 |
shouldThrow(); |
497 |
} catch (IllegalArgumentException success) {} |
498 |
} |
499 |
|
500 |
/** |
501 |
* hasWaiters throws IMSE if not locked |
502 |
*/ |
503 |
public void testHasWaitersIMSE() { |
504 |
final ReentrantLock lock = new ReentrantLock(); |
505 |
final Condition c = lock.newCondition(); |
506 |
try { |
507 |
lock.hasWaiters(c); |
508 |
shouldThrow(); |
509 |
} catch (IllegalMonitorStateException success) {} |
510 |
} |
511 |
|
512 |
|
513 |
/** |
514 |
* getWaitQueueLength throws IAE if not owned |
515 |
*/ |
516 |
public void testGetWaitQueueLengthIAE() { |
517 |
final ReentrantLock lock = new ReentrantLock(); |
518 |
final Condition c = lock.newCondition(); |
519 |
final ReentrantLock lock2 = new ReentrantLock(); |
520 |
try { |
521 |
lock2.getWaitQueueLength(c); |
522 |
shouldThrow(); |
523 |
} catch (IllegalArgumentException success) {} |
524 |
} |
525 |
|
526 |
/** |
527 |
* getWaitQueueLength throws IMSE if not locked |
528 |
*/ |
529 |
public void testGetWaitQueueLengthIMSE() { |
530 |
final ReentrantLock lock = new ReentrantLock(); |
531 |
final Condition c = lock.newCondition(); |
532 |
try { |
533 |
lock.getWaitQueueLength(c); |
534 |
shouldThrow(); |
535 |
} catch (IllegalMonitorStateException success) {} |
536 |
} |
537 |
|
538 |
|
539 |
/** |
540 |
* getWaitingThreads throws IAE if not owned |
541 |
*/ |
542 |
public void testGetWaitingThreadsIAE() { |
543 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
544 |
final Condition c = lock.newCondition(); |
545 |
final PublicReentrantLock lock2 = new PublicReentrantLock(); |
546 |
try { |
547 |
lock2.getWaitingThreads(c); |
548 |
shouldThrow(); |
549 |
} catch (IllegalArgumentException success) {} |
550 |
} |
551 |
|
552 |
/** |
553 |
* getWaitingThreads throws IMSE if not locked |
554 |
*/ |
555 |
public void testGetWaitingThreadsIMSE() { |
556 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
557 |
final Condition c = lock.newCondition(); |
558 |
try { |
559 |
lock.getWaitingThreads(c); |
560 |
shouldThrow(); |
561 |
} catch (IllegalMonitorStateException success) {} |
562 |
} |
563 |
|
564 |
|
565 |
/** |
566 |
* hasWaiters returns true when a thread is waiting, else false |
567 |
*/ |
568 |
public void testHasWaiters() throws InterruptedException { |
569 |
final ReentrantLock lock = new ReentrantLock(); |
570 |
final Condition c = lock.newCondition(); |
571 |
Thread t = newStartedThread(new CheckedRunnable() { |
572 |
public void realRun() throws InterruptedException { |
573 |
lock.lock(); |
574 |
assertFalse(lock.hasWaiters(c)); |
575 |
assertEquals(0, lock.getWaitQueueLength(c)); |
576 |
c.await(); |
577 |
lock.unlock(); |
578 |
}}); |
579 |
|
580 |
delay(SHORT_DELAY_MS); |
581 |
lock.lock(); |
582 |
assertTrue(lock.hasWaiters(c)); |
583 |
assertEquals(1, lock.getWaitQueueLength(c)); |
584 |
c.signal(); |
585 |
lock.unlock(); |
586 |
delay(SHORT_DELAY_MS); |
587 |
lock.lock(); |
588 |
assertFalse(lock.hasWaiters(c)); |
589 |
assertEquals(0, lock.getWaitQueueLength(c)); |
590 |
lock.unlock(); |
591 |
awaitTermination(t); |
592 |
} |
593 |
|
594 |
/** |
595 |
* getWaitQueueLength returns number of waiting threads |
596 |
*/ |
597 |
public void testGetWaitQueueLength() throws InterruptedException { |
598 |
final ReentrantLock lock = new ReentrantLock(); |
599 |
final Condition c = lock.newCondition(); |
600 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
601 |
public void realRun() throws InterruptedException { |
602 |
lock.lock(); |
603 |
assertFalse(lock.hasWaiters(c)); |
604 |
assertEquals(0, lock.getWaitQueueLength(c)); |
605 |
c.await(); |
606 |
lock.unlock(); |
607 |
}}); |
608 |
|
609 |
delay(SHORT_DELAY_MS); |
610 |
|
611 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
612 |
public void realRun() throws InterruptedException { |
613 |
lock.lock(); |
614 |
assertTrue(lock.hasWaiters(c)); |
615 |
assertEquals(1, lock.getWaitQueueLength(c)); |
616 |
c.await(); |
617 |
lock.unlock(); |
618 |
}}); |
619 |
|
620 |
delay(SHORT_DELAY_MS); |
621 |
lock.lock(); |
622 |
assertTrue(lock.hasWaiters(c)); |
623 |
assertEquals(2, lock.getWaitQueueLength(c)); |
624 |
c.signalAll(); |
625 |
lock.unlock(); |
626 |
delay(SHORT_DELAY_MS); |
627 |
lock.lock(); |
628 |
assertFalse(lock.hasWaiters(c)); |
629 |
assertEquals(0, lock.getWaitQueueLength(c)); |
630 |
lock.unlock(); |
631 |
awaitTermination(t1); |
632 |
awaitTermination(t2); |
633 |
} |
634 |
|
635 |
/** |
636 |
* getWaitingThreads returns only and all waiting threads |
637 |
*/ |
638 |
public void testGetWaitingThreads() throws InterruptedException { |
639 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
640 |
final Condition c = lock.newCondition(); |
641 |
Thread t1 = new Thread(new CheckedRunnable() { |
642 |
public void realRun() throws InterruptedException { |
643 |
lock.lock(); |
644 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
645 |
c.await(); |
646 |
lock.unlock(); |
647 |
}}); |
648 |
|
649 |
Thread t2 = new Thread(new CheckedRunnable() { |
650 |
public void realRun() throws InterruptedException { |
651 |
lock.lock(); |
652 |
assertFalse(lock.getWaitingThreads(c).isEmpty()); |
653 |
c.await(); |
654 |
lock.unlock(); |
655 |
}}); |
656 |
|
657 |
lock.lock(); |
658 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
659 |
lock.unlock(); |
660 |
t1.start(); |
661 |
delay(SHORT_DELAY_MS); |
662 |
t2.start(); |
663 |
delay(SHORT_DELAY_MS); |
664 |
lock.lock(); |
665 |
assertTrue(lock.hasWaiters(c)); |
666 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
667 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
668 |
c.signalAll(); |
669 |
lock.unlock(); |
670 |
delay(SHORT_DELAY_MS); |
671 |
lock.lock(); |
672 |
assertFalse(lock.hasWaiters(c)); |
673 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
674 |
lock.unlock(); |
675 |
awaitTermination(t1); |
676 |
awaitTermination(t2); |
677 |
} |
678 |
|
679 |
/** A helper class for uninterruptible wait tests */ |
680 |
class UninterruptibleThread extends Thread { |
681 |
private ReentrantLock lock; |
682 |
private Condition c; |
683 |
|
684 |
public volatile boolean canAwake = false; |
685 |
public volatile boolean interrupted = false; |
686 |
public volatile boolean lockStarted = false; |
687 |
|
688 |
public UninterruptibleThread(ReentrantLock lock, Condition c) { |
689 |
this.lock = lock; |
690 |
this.c = c; |
691 |
} |
692 |
|
693 |
public synchronized void run() { |
694 |
lock.lock(); |
695 |
lockStarted = true; |
696 |
|
697 |
while (!canAwake) { |
698 |
c.awaitUninterruptibly(); |
699 |
} |
700 |
|
701 |
interrupted = isInterrupted(); |
702 |
lock.unlock(); |
703 |
} |
704 |
} |
705 |
|
706 |
/** |
707 |
* awaitUninterruptibly doesn't abort on interrupt |
708 |
*/ |
709 |
public void testAwaitUninterruptibly() throws InterruptedException { |
710 |
final ReentrantLock lock = new ReentrantLock(); |
711 |
final Condition c = lock.newCondition(); |
712 |
UninterruptibleThread thread = new UninterruptibleThread(lock, c); |
713 |
|
714 |
thread.start(); |
715 |
|
716 |
while (!thread.lockStarted) { |
717 |
delay(100); |
718 |
} |
719 |
|
720 |
lock.lock(); |
721 |
try { |
722 |
thread.interrupt(); |
723 |
thread.canAwake = true; |
724 |
c.signal(); |
725 |
} finally { |
726 |
lock.unlock(); |
727 |
} |
728 |
|
729 |
thread.join(); |
730 |
assertTrue(thread.interrupted); |
731 |
assertFalse(thread.isAlive()); |
732 |
} |
733 |
|
734 |
/** |
735 |
* await is interruptible |
736 |
*/ |
737 |
public void testAwait_Interrupt() throws InterruptedException { |
738 |
final ReentrantLock lock = new ReentrantLock(); |
739 |
final Condition c = lock.newCondition(); |
740 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
741 |
public void realRun() throws InterruptedException { |
742 |
lock.lock(); |
743 |
c.await(); |
744 |
}}); |
745 |
|
746 |
delay(SHORT_DELAY_MS); |
747 |
t.interrupt(); |
748 |
awaitTermination(t); |
749 |
} |
750 |
|
751 |
/** |
752 |
* awaitNanos is interruptible |
753 |
*/ |
754 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
755 |
final ReentrantLock lock = new ReentrantLock(); |
756 |
final Condition c = lock.newCondition(); |
757 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
758 |
public void realRun() throws InterruptedException { |
759 |
lock.lock(); |
760 |
c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS)); |
761 |
}}); |
762 |
|
763 |
delay(SHORT_DELAY_MS); |
764 |
t.interrupt(); |
765 |
awaitTermination(t); |
766 |
} |
767 |
|
768 |
/** |
769 |
* awaitUntil is interruptible |
770 |
*/ |
771 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
772 |
final ReentrantLock lock = new ReentrantLock(); |
773 |
final Condition c = lock.newCondition(); |
774 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
775 |
public void realRun() throws InterruptedException { |
776 |
lock.lock(); |
777 |
java.util.Date d = new java.util.Date(); |
778 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
779 |
}}); |
780 |
|
781 |
delay(SHORT_DELAY_MS); |
782 |
t.interrupt(); |
783 |
awaitTermination(t); |
784 |
} |
785 |
|
786 |
/** |
787 |
* signalAll wakes up all threads |
788 |
*/ |
789 |
public void testSignalAll() throws InterruptedException { |
790 |
final ReentrantLock lock = new ReentrantLock(); |
791 |
final Condition c = lock.newCondition(); |
792 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
793 |
public void realRun() throws InterruptedException { |
794 |
lock.lock(); |
795 |
c.await(); |
796 |
lock.unlock(); |
797 |
}}); |
798 |
|
799 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
800 |
public void realRun() throws InterruptedException { |
801 |
lock.lock(); |
802 |
c.await(); |
803 |
lock.unlock(); |
804 |
}}); |
805 |
|
806 |
delay(SHORT_DELAY_MS); |
807 |
lock.lock(); |
808 |
c.signalAll(); |
809 |
lock.unlock(); |
810 |
awaitTermination(t1); |
811 |
awaitTermination(t2); |
812 |
} |
813 |
|
814 |
/** |
815 |
* await after multiple reentrant locking preserves lock count |
816 |
*/ |
817 |
public void testAwaitLockCount() throws InterruptedException { |
818 |
final ReentrantLock lock = new ReentrantLock(); |
819 |
final Condition c = lock.newCondition(); |
820 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
821 |
public void realRun() throws InterruptedException { |
822 |
lock.lock(); |
823 |
assertEquals(1, lock.getHoldCount()); |
824 |
c.await(); |
825 |
assertEquals(1, lock.getHoldCount()); |
826 |
lock.unlock(); |
827 |
}}); |
828 |
|
829 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
830 |
public void realRun() throws InterruptedException { |
831 |
lock.lock(); |
832 |
lock.lock(); |
833 |
assertEquals(2, lock.getHoldCount()); |
834 |
c.await(); |
835 |
assertEquals(2, lock.getHoldCount()); |
836 |
lock.unlock(); |
837 |
lock.unlock(); |
838 |
}}); |
839 |
|
840 |
delay(SHORT_DELAY_MS); |
841 |
lock.lock(); |
842 |
c.signalAll(); |
843 |
lock.unlock(); |
844 |
awaitTermination(t1); |
845 |
awaitTermination(t2); |
846 |
} |
847 |
|
848 |
/** |
849 |
* A serialized lock deserializes as unlocked |
850 |
*/ |
851 |
public void testSerialization() throws Exception { |
852 |
ReentrantLock l = new ReentrantLock(); |
853 |
l.lock(); |
854 |
l.unlock(); |
855 |
|
856 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
857 |
ObjectOutputStream out = |
858 |
new ObjectOutputStream(new BufferedOutputStream(bout)); |
859 |
out.writeObject(l); |
860 |
out.close(); |
861 |
|
862 |
ByteArrayInputStream bin = |
863 |
new ByteArrayInputStream(bout.toByteArray()); |
864 |
ObjectInputStream in = |
865 |
new ObjectInputStream(new BufferedInputStream(bin)); |
866 |
ReentrantLock r = (ReentrantLock) in.readObject(); |
867 |
r.lock(); |
868 |
r.unlock(); |
869 |
} |
870 |
|
871 |
/** |
872 |
* toString indicates current lock state |
873 |
*/ |
874 |
public void testToString() { |
875 |
ReentrantLock lock = new ReentrantLock(); |
876 |
String us = lock.toString(); |
877 |
assertTrue(us.indexOf("Unlocked") >= 0); |
878 |
lock.lock(); |
879 |
String ls = lock.toString(); |
880 |
assertTrue(ls.indexOf("Locked") >= 0); |
881 |
} |
882 |
|
883 |
} |