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 Andrew Wright, Jeffrey Hayes, |
6 |
* Pat Fisher, Mike Judd. |
7 |
*/ |
8 |
|
9 |
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 |
} |
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|
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/** |
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* 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 { |
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lock.lockInterruptibly(); |
45 |
} |
46 |
} |
47 |
|
48 |
/** |
49 |
* 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 |
} |
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|
60 |
|
61 |
} |
62 |
|
63 |
/** |
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* Constructor sets given fairness |
65 |
*/ |
66 |
public void testConstructor() { |
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assertFalse(new ReentrantLock().isFair()); |
68 |
assertFalse(new ReentrantLock(false).isFair()); |
69 |
assertTrue(new ReentrantLock(true).isFair()); |
70 |
} |
71 |
|
72 |
/** |
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* locking an unlocked lock succeeds |
74 |
*/ |
75 |
public void testLock() { |
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ReentrantLock rl = new ReentrantLock(); |
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rl.lock(); |
78 |
assertTrue(rl.isLocked()); |
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rl.unlock(); |
80 |
assertFalse(rl.isLocked()); |
81 |
} |
82 |
|
83 |
/** |
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* locking an unlocked fair lock succeeds |
85 |
*/ |
86 |
public void testFairLock() { |
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ReentrantLock rl = new ReentrantLock(true); |
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rl.lock(); |
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assertTrue(rl.isLocked()); |
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rl.unlock(); |
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} |
92 |
|
93 |
/** |
94 |
* Unlocking an unlocked lock throws IllegalMonitorStateException |
95 |
*/ |
96 |
public void testUnlock_IllegalMonitorStateException() { |
97 |
ReentrantLock rl = new ReentrantLock(); |
98 |
try { |
99 |
rl.unlock(); |
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shouldThrow(); |
101 |
} catch (IllegalMonitorStateException success) {} |
102 |
} |
103 |
|
104 |
/** |
105 |
* tryLock on an unlocked lock succeeds |
106 |
*/ |
107 |
public void testTryLock() { |
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ReentrantLock rl = new ReentrantLock(); |
109 |
assertTrue(rl.tryLock()); |
110 |
assertTrue(rl.isLocked()); |
111 |
rl.unlock(); |
112 |
} |
113 |
|
114 |
|
115 |
/** |
116 |
* hasQueuedThreads reports whether there are waiting threads |
117 |
*/ |
118 |
public void testhasQueuedThreads() throws InterruptedException { |
119 |
final ReentrantLock lock = new ReentrantLock(); |
120 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
121 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
122 |
assertFalse(lock.hasQueuedThreads()); |
123 |
lock.lock(); |
124 |
t1.start(); |
125 |
Thread.sleep(SHORT_DELAY_MS); |
126 |
assertTrue(lock.hasQueuedThreads()); |
127 |
t2.start(); |
128 |
Thread.sleep(SHORT_DELAY_MS); |
129 |
assertTrue(lock.hasQueuedThreads()); |
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t1.interrupt(); |
131 |
Thread.sleep(SHORT_DELAY_MS); |
132 |
assertTrue(lock.hasQueuedThreads()); |
133 |
lock.unlock(); |
134 |
Thread.sleep(SHORT_DELAY_MS); |
135 |
assertFalse(lock.hasQueuedThreads()); |
136 |
t1.join(); |
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t2.join(); |
138 |
} |
139 |
|
140 |
/** |
141 |
* getQueueLength reports number of waiting threads |
142 |
*/ |
143 |
public void testGetQueueLength() throws InterruptedException { |
144 |
final ReentrantLock lock = new ReentrantLock(); |
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Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
146 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
147 |
assertEquals(0, lock.getQueueLength()); |
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lock.lock(); |
149 |
t1.start(); |
150 |
Thread.sleep(SHORT_DELAY_MS); |
151 |
assertEquals(1, lock.getQueueLength()); |
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t2.start(); |
153 |
Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(2, lock.getQueueLength()); |
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t1.interrupt(); |
156 |
Thread.sleep(SHORT_DELAY_MS); |
157 |
assertEquals(1, lock.getQueueLength()); |
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lock.unlock(); |
159 |
Thread.sleep(SHORT_DELAY_MS); |
160 |
assertEquals(0, lock.getQueueLength()); |
161 |
t1.join(); |
162 |
t2.join(); |
163 |
} |
164 |
|
165 |
/** |
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* getQueueLength reports number of waiting threads |
167 |
*/ |
168 |
public void testGetQueueLength_fair() throws InterruptedException { |
169 |
final ReentrantLock lock = new ReentrantLock(true); |
170 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
171 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
172 |
assertEquals(0, lock.getQueueLength()); |
173 |
lock.lock(); |
174 |
t1.start(); |
175 |
Thread.sleep(SHORT_DELAY_MS); |
176 |
assertEquals(1, lock.getQueueLength()); |
177 |
t2.start(); |
178 |
Thread.sleep(SHORT_DELAY_MS); |
179 |
assertEquals(2, lock.getQueueLength()); |
180 |
t1.interrupt(); |
181 |
Thread.sleep(SHORT_DELAY_MS); |
182 |
assertEquals(1, lock.getQueueLength()); |
183 |
lock.unlock(); |
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Thread.sleep(SHORT_DELAY_MS); |
185 |
assertEquals(0, lock.getQueueLength()); |
186 |
t1.join(); |
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t2.join(); |
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} |
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|
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/** |
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* hasQueuedThread(null) throws NPE |
192 |
*/ |
193 |
public void testHasQueuedThreadNPE() { |
194 |
final ReentrantLock sync = new ReentrantLock(); |
195 |
try { |
196 |
sync.hasQueuedThread(null); |
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shouldThrow(); |
198 |
} catch (NullPointerException success) {} |
199 |
} |
200 |
|
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/** |
202 |
* hasQueuedThread reports whether a thread is queued. |
203 |
*/ |
204 |
public void testHasQueuedThread() throws InterruptedException { |
205 |
final ReentrantLock sync = new ReentrantLock(); |
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Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
207 |
Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
208 |
assertFalse(sync.hasQueuedThread(t1)); |
209 |
assertFalse(sync.hasQueuedThread(t2)); |
210 |
sync.lock(); |
211 |
t1.start(); |
212 |
Thread.sleep(SHORT_DELAY_MS); |
213 |
assertTrue(sync.hasQueuedThread(t1)); |
214 |
t2.start(); |
215 |
Thread.sleep(SHORT_DELAY_MS); |
216 |
assertTrue(sync.hasQueuedThread(t1)); |
217 |
assertTrue(sync.hasQueuedThread(t2)); |
218 |
t1.interrupt(); |
219 |
Thread.sleep(SHORT_DELAY_MS); |
220 |
assertFalse(sync.hasQueuedThread(t1)); |
221 |
assertTrue(sync.hasQueuedThread(t2)); |
222 |
sync.unlock(); |
223 |
Thread.sleep(SHORT_DELAY_MS); |
224 |
assertFalse(sync.hasQueuedThread(t1)); |
225 |
Thread.sleep(SHORT_DELAY_MS); |
226 |
assertFalse(sync.hasQueuedThread(t2)); |
227 |
t1.join(); |
228 |
t2.join(); |
229 |
} |
230 |
|
231 |
|
232 |
/** |
233 |
* getQueuedThreads includes waiting threads |
234 |
*/ |
235 |
public void testGetQueuedThreads() throws InterruptedException { |
236 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
237 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
238 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
239 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
240 |
lock.lock(); |
241 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
242 |
t1.start(); |
243 |
Thread.sleep(SHORT_DELAY_MS); |
244 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
245 |
t2.start(); |
246 |
Thread.sleep(SHORT_DELAY_MS); |
247 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
248 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
249 |
t1.interrupt(); |
250 |
Thread.sleep(SHORT_DELAY_MS); |
251 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
252 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
253 |
lock.unlock(); |
254 |
Thread.sleep(SHORT_DELAY_MS); |
255 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
256 |
t1.join(); |
257 |
t2.join(); |
258 |
} |
259 |
|
260 |
|
261 |
/** |
262 |
* timed tryLock is interruptible. |
263 |
*/ |
264 |
public void testInterruptedException2() throws InterruptedException { |
265 |
final ReentrantLock lock = new ReentrantLock(); |
266 |
lock.lock(); |
267 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
268 |
public void realRun() throws InterruptedException { |
269 |
lock.tryLock(MEDIUM_DELAY_MS,MILLISECONDS); |
270 |
}}); |
271 |
|
272 |
t.start(); |
273 |
t.interrupt(); |
274 |
t.join(); |
275 |
} |
276 |
|
277 |
|
278 |
/** |
279 |
* TryLock on a locked lock fails |
280 |
*/ |
281 |
public void testTryLockWhenLocked() throws InterruptedException { |
282 |
final ReentrantLock lock = new ReentrantLock(); |
283 |
lock.lock(); |
284 |
Thread t = new Thread(new CheckedRunnable() { |
285 |
public void realRun() { |
286 |
threadAssertFalse(lock.tryLock()); |
287 |
}}); |
288 |
|
289 |
t.start(); |
290 |
t.join(); |
291 |
lock.unlock(); |
292 |
} |
293 |
|
294 |
/** |
295 |
* Timed tryLock on a locked lock times out |
296 |
*/ |
297 |
public void testTryLock_Timeout() throws InterruptedException { |
298 |
final ReentrantLock lock = new ReentrantLock(); |
299 |
lock.lock(); |
300 |
Thread t = new Thread(new CheckedRunnable() { |
301 |
public void realRun() throws InterruptedException { |
302 |
threadAssertFalse(lock.tryLock(1, MILLISECONDS)); |
303 |
}}); |
304 |
|
305 |
t.start(); |
306 |
t.join(); |
307 |
lock.unlock(); |
308 |
} |
309 |
|
310 |
/** |
311 |
* getHoldCount returns number of recursive holds |
312 |
*/ |
313 |
public void testGetHoldCount() { |
314 |
ReentrantLock lock = new ReentrantLock(); |
315 |
for (int i = 1; i <= SIZE; i++) { |
316 |
lock.lock(); |
317 |
assertEquals(i, lock.getHoldCount()); |
318 |
} |
319 |
for (int i = SIZE; i > 0; i--) { |
320 |
lock.unlock(); |
321 |
assertEquals(i-1, lock.getHoldCount()); |
322 |
} |
323 |
} |
324 |
|
325 |
|
326 |
/** |
327 |
* isLocked is true when locked and false when not |
328 |
*/ |
329 |
public void testIsLocked() throws InterruptedException { |
330 |
final ReentrantLock lock = new ReentrantLock(); |
331 |
lock.lock(); |
332 |
assertTrue(lock.isLocked()); |
333 |
lock.unlock(); |
334 |
assertFalse(lock.isLocked()); |
335 |
Thread t = new Thread(new CheckedRunnable() { |
336 |
public void realRun() throws InterruptedException { |
337 |
lock.lock(); |
338 |
Thread.sleep(SMALL_DELAY_MS); |
339 |
lock.unlock(); |
340 |
}}); |
341 |
|
342 |
t.start(); |
343 |
Thread.sleep(SHORT_DELAY_MS); |
344 |
assertTrue(lock.isLocked()); |
345 |
t.join(); |
346 |
assertFalse(lock.isLocked()); |
347 |
} |
348 |
|
349 |
|
350 |
/** |
351 |
* lockInterruptibly is interruptible. |
352 |
*/ |
353 |
public void testLockInterruptibly1() throws InterruptedException { |
354 |
final ReentrantLock lock = new ReentrantLock(); |
355 |
lock.lock(); |
356 |
Thread t = new Thread(new InterruptedLockRunnable(lock)); |
357 |
t.start(); |
358 |
Thread.sleep(SHORT_DELAY_MS); |
359 |
t.interrupt(); |
360 |
Thread.sleep(SHORT_DELAY_MS); |
361 |
lock.unlock(); |
362 |
t.join(); |
363 |
} |
364 |
|
365 |
/** |
366 |
* lockInterruptibly succeeds when unlocked, else is interruptible |
367 |
*/ |
368 |
public void testLockInterruptibly2() throws InterruptedException { |
369 |
final ReentrantLock lock = new ReentrantLock(); |
370 |
lock.lockInterruptibly(); |
371 |
Thread t = new Thread(new InterruptedLockRunnable(lock)); |
372 |
t.start(); |
373 |
t.interrupt(); |
374 |
assertTrue(lock.isLocked()); |
375 |
assertTrue(lock.isHeldByCurrentThread()); |
376 |
t.join(); |
377 |
} |
378 |
|
379 |
/** |
380 |
* Calling await without holding lock throws IllegalMonitorStateException |
381 |
*/ |
382 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
383 |
final ReentrantLock lock = new ReentrantLock(); |
384 |
final Condition c = lock.newCondition(); |
385 |
try { |
386 |
c.await(); |
387 |
shouldThrow(); |
388 |
} catch (IllegalMonitorStateException success) {} |
389 |
} |
390 |
|
391 |
/** |
392 |
* Calling signal without holding lock throws IllegalMonitorStateException |
393 |
*/ |
394 |
public void testSignal_IllegalMonitor() { |
395 |
final ReentrantLock lock = new ReentrantLock(); |
396 |
final Condition c = lock.newCondition(); |
397 |
try { |
398 |
c.signal(); |
399 |
shouldThrow(); |
400 |
} catch (IllegalMonitorStateException success) {} |
401 |
} |
402 |
|
403 |
/** |
404 |
* awaitNanos without a signal times out |
405 |
*/ |
406 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
407 |
final ReentrantLock lock = new ReentrantLock(); |
408 |
final Condition c = lock.newCondition(); |
409 |
lock.lock(); |
410 |
long t = c.awaitNanos(100); |
411 |
assertTrue(t <= 0); |
412 |
lock.unlock(); |
413 |
} |
414 |
|
415 |
/** |
416 |
* timed await without a signal times out |
417 |
*/ |
418 |
public void testAwait_Timeout() throws InterruptedException { |
419 |
final ReentrantLock lock = new ReentrantLock(); |
420 |
final Condition c = lock.newCondition(); |
421 |
lock.lock(); |
422 |
assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS)); |
423 |
lock.unlock(); |
424 |
} |
425 |
|
426 |
/** |
427 |
* awaitUntil without a signal times out |
428 |
*/ |
429 |
public void testAwaitUntil_Timeout() throws InterruptedException { |
430 |
final ReentrantLock lock = new ReentrantLock(); |
431 |
final Condition c = lock.newCondition(); |
432 |
lock.lock(); |
433 |
java.util.Date d = new java.util.Date(); |
434 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
435 |
lock.unlock(); |
436 |
} |
437 |
|
438 |
/** |
439 |
* await returns when signalled |
440 |
*/ |
441 |
public void testAwait() throws InterruptedException { |
442 |
final ReentrantLock lock = new ReentrantLock(); |
443 |
final Condition c = lock.newCondition(); |
444 |
Thread t = new Thread(new CheckedRunnable() { |
445 |
public void realRun() throws InterruptedException { |
446 |
lock.lock(); |
447 |
c.await(); |
448 |
lock.unlock(); |
449 |
}}); |
450 |
|
451 |
t.start(); |
452 |
Thread.sleep(SHORT_DELAY_MS); |
453 |
lock.lock(); |
454 |
c.signal(); |
455 |
lock.unlock(); |
456 |
t.join(SHORT_DELAY_MS); |
457 |
assertFalse(t.isAlive()); |
458 |
} |
459 |
|
460 |
/** |
461 |
* hasWaiters throws NPE if null |
462 |
*/ |
463 |
public void testHasWaitersNPE() { |
464 |
final ReentrantLock lock = new ReentrantLock(); |
465 |
try { |
466 |
lock.hasWaiters(null); |
467 |
shouldThrow(); |
468 |
} catch (NullPointerException success) {} |
469 |
} |
470 |
|
471 |
/** |
472 |
* getWaitQueueLength throws NPE if null |
473 |
*/ |
474 |
public void testGetWaitQueueLengthNPE() { |
475 |
final ReentrantLock lock = new ReentrantLock(); |
476 |
try { |
477 |
lock.getWaitQueueLength(null); |
478 |
shouldThrow(); |
479 |
} catch (NullPointerException success) {} |
480 |
} |
481 |
|
482 |
|
483 |
/** |
484 |
* getWaitingThreads throws NPE if null |
485 |
*/ |
486 |
public void testGetWaitingThreadsNPE() { |
487 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
488 |
try { |
489 |
lock.getWaitingThreads(null); |
490 |
shouldThrow(); |
491 |
} catch (NullPointerException success) {} |
492 |
} |
493 |
|
494 |
|
495 |
/** |
496 |
* hasWaiters throws IAE if not owned |
497 |
*/ |
498 |
public void testHasWaitersIAE() { |
499 |
final ReentrantLock lock = new ReentrantLock(); |
500 |
final Condition c = lock.newCondition(); |
501 |
final ReentrantLock lock2 = new ReentrantLock(); |
502 |
try { |
503 |
lock2.hasWaiters(c); |
504 |
shouldThrow(); |
505 |
} catch (IllegalArgumentException success) {} |
506 |
} |
507 |
|
508 |
/** |
509 |
* hasWaiters throws IMSE if not locked |
510 |
*/ |
511 |
public void testHasWaitersIMSE() { |
512 |
final ReentrantLock lock = new ReentrantLock(); |
513 |
final Condition c = lock.newCondition(); |
514 |
try { |
515 |
lock.hasWaiters(c); |
516 |
shouldThrow(); |
517 |
} catch (IllegalMonitorStateException success) {} |
518 |
} |
519 |
|
520 |
|
521 |
/** |
522 |
* getWaitQueueLength throws IAE if not owned |
523 |
*/ |
524 |
public void testGetWaitQueueLengthIAE() { |
525 |
final ReentrantLock lock = new ReentrantLock(); |
526 |
final Condition c = lock.newCondition(); |
527 |
final ReentrantLock lock2 = new ReentrantLock(); |
528 |
try { |
529 |
lock2.getWaitQueueLength(c); |
530 |
shouldThrow(); |
531 |
} catch (IllegalArgumentException success) {} |
532 |
} |
533 |
|
534 |
/** |
535 |
* getWaitQueueLength throws IMSE if not locked |
536 |
*/ |
537 |
public void testGetWaitQueueLengthIMSE() { |
538 |
final ReentrantLock lock = new ReentrantLock(); |
539 |
final Condition c = lock.newCondition(); |
540 |
try { |
541 |
lock.getWaitQueueLength(c); |
542 |
shouldThrow(); |
543 |
} catch (IllegalMonitorStateException success) {} |
544 |
} |
545 |
|
546 |
|
547 |
/** |
548 |
* getWaitingThreads throws IAE if not owned |
549 |
*/ |
550 |
public void testGetWaitingThreadsIAE() { |
551 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
552 |
final Condition c = lock.newCondition(); |
553 |
final PublicReentrantLock lock2 = new PublicReentrantLock(); |
554 |
try { |
555 |
lock2.getWaitingThreads(c); |
556 |
shouldThrow(); |
557 |
} catch (IllegalArgumentException success) {} |
558 |
} |
559 |
|
560 |
/** |
561 |
* getWaitingThreads throws IMSE if not locked |
562 |
*/ |
563 |
public void testGetWaitingThreadsIMSE() { |
564 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
565 |
final Condition c = lock.newCondition(); |
566 |
try { |
567 |
lock.getWaitingThreads(c); |
568 |
shouldThrow(); |
569 |
} catch (IllegalMonitorStateException success) {} |
570 |
} |
571 |
|
572 |
|
573 |
/** |
574 |
* hasWaiters returns true when a thread is waiting, else false |
575 |
*/ |
576 |
public void testHasWaiters() throws InterruptedException { |
577 |
final ReentrantLock lock = new ReentrantLock(); |
578 |
final Condition c = lock.newCondition(); |
579 |
Thread t = new Thread(new CheckedRunnable() { |
580 |
public void realRun() throws InterruptedException { |
581 |
lock.lock(); |
582 |
threadAssertFalse(lock.hasWaiters(c)); |
583 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
584 |
c.await(); |
585 |
lock.unlock(); |
586 |
}}); |
587 |
|
588 |
t.start(); |
589 |
Thread.sleep(SHORT_DELAY_MS); |
590 |
lock.lock(); |
591 |
assertTrue(lock.hasWaiters(c)); |
592 |
assertEquals(1, lock.getWaitQueueLength(c)); |
593 |
c.signal(); |
594 |
lock.unlock(); |
595 |
Thread.sleep(SHORT_DELAY_MS); |
596 |
lock.lock(); |
597 |
assertFalse(lock.hasWaiters(c)); |
598 |
assertEquals(0, lock.getWaitQueueLength(c)); |
599 |
lock.unlock(); |
600 |
t.join(SHORT_DELAY_MS); |
601 |
assertFalse(t.isAlive()); |
602 |
} |
603 |
|
604 |
/** |
605 |
* getWaitQueueLength returns number of waiting threads |
606 |
*/ |
607 |
public void testGetWaitQueueLength() throws InterruptedException { |
608 |
final ReentrantLock lock = new ReentrantLock(); |
609 |
final Condition c = lock.newCondition(); |
610 |
Thread t1 = new Thread(new CheckedRunnable() { |
611 |
public void realRun() throws InterruptedException { |
612 |
lock.lock(); |
613 |
threadAssertFalse(lock.hasWaiters(c)); |
614 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
615 |
c.await(); |
616 |
lock.unlock(); |
617 |
}}); |
618 |
|
619 |
Thread t2 = new Thread(new CheckedRunnable() { |
620 |
public void realRun() throws InterruptedException { |
621 |
lock.lock(); |
622 |
threadAssertTrue(lock.hasWaiters(c)); |
623 |
threadAssertEquals(1, lock.getWaitQueueLength(c)); |
624 |
c.await(); |
625 |
lock.unlock(); |
626 |
}}); |
627 |
|
628 |
t1.start(); |
629 |
Thread.sleep(SHORT_DELAY_MS); |
630 |
t2.start(); |
631 |
Thread.sleep(SHORT_DELAY_MS); |
632 |
lock.lock(); |
633 |
assertTrue(lock.hasWaiters(c)); |
634 |
assertEquals(2, lock.getWaitQueueLength(c)); |
635 |
c.signalAll(); |
636 |
lock.unlock(); |
637 |
Thread.sleep(SHORT_DELAY_MS); |
638 |
lock.lock(); |
639 |
assertFalse(lock.hasWaiters(c)); |
640 |
assertEquals(0, lock.getWaitQueueLength(c)); |
641 |
lock.unlock(); |
642 |
t1.join(SHORT_DELAY_MS); |
643 |
t2.join(SHORT_DELAY_MS); |
644 |
assertFalse(t1.isAlive()); |
645 |
assertFalse(t2.isAlive()); |
646 |
} |
647 |
|
648 |
/** |
649 |
* getWaitingThreads returns only and all waiting threads |
650 |
*/ |
651 |
public void testGetWaitingThreads() throws InterruptedException { |
652 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
653 |
final Condition c = lock.newCondition(); |
654 |
Thread t1 = new Thread(new CheckedRunnable() { |
655 |
public void realRun() throws InterruptedException { |
656 |
lock.lock(); |
657 |
threadAssertTrue(lock.getWaitingThreads(c).isEmpty()); |
658 |
c.await(); |
659 |
lock.unlock(); |
660 |
}}); |
661 |
|
662 |
Thread t2 = new Thread(new CheckedRunnable() { |
663 |
public void realRun() throws InterruptedException { |
664 |
lock.lock(); |
665 |
threadAssertFalse(lock.getWaitingThreads(c).isEmpty()); |
666 |
c.await(); |
667 |
lock.unlock(); |
668 |
}}); |
669 |
|
670 |
lock.lock(); |
671 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
672 |
lock.unlock(); |
673 |
t1.start(); |
674 |
Thread.sleep(SHORT_DELAY_MS); |
675 |
t2.start(); |
676 |
Thread.sleep(SHORT_DELAY_MS); |
677 |
lock.lock(); |
678 |
assertTrue(lock.hasWaiters(c)); |
679 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
680 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
681 |
c.signalAll(); |
682 |
lock.unlock(); |
683 |
Thread.sleep(SHORT_DELAY_MS); |
684 |
lock.lock(); |
685 |
assertFalse(lock.hasWaiters(c)); |
686 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
687 |
lock.unlock(); |
688 |
t1.join(SHORT_DELAY_MS); |
689 |
t2.join(SHORT_DELAY_MS); |
690 |
assertFalse(t1.isAlive()); |
691 |
assertFalse(t2.isAlive()); |
692 |
} |
693 |
|
694 |
/** A helper class for uninterruptible wait tests */ |
695 |
class UninterruptibleThread extends Thread { |
696 |
private ReentrantLock lock; |
697 |
private Condition c; |
698 |
|
699 |
public volatile boolean canAwake = false; |
700 |
public volatile boolean interrupted = false; |
701 |
public volatile boolean lockStarted = false; |
702 |
|
703 |
public UninterruptibleThread(ReentrantLock lock, Condition c) { |
704 |
this.lock = lock; |
705 |
this.c = c; |
706 |
} |
707 |
|
708 |
public synchronized void run() { |
709 |
lock.lock(); |
710 |
lockStarted = true; |
711 |
|
712 |
while (!canAwake) { |
713 |
c.awaitUninterruptibly(); |
714 |
} |
715 |
|
716 |
interrupted = isInterrupted(); |
717 |
lock.unlock(); |
718 |
} |
719 |
} |
720 |
|
721 |
/** |
722 |
* awaitUninterruptibly doesn't abort on interrupt |
723 |
*/ |
724 |
public void testAwaitUninterruptibly() throws InterruptedException { |
725 |
final ReentrantLock lock = new ReentrantLock(); |
726 |
final Condition c = lock.newCondition(); |
727 |
UninterruptibleThread thread = new UninterruptibleThread(lock, c); |
728 |
|
729 |
thread.start(); |
730 |
|
731 |
while (!thread.lockStarted) { |
732 |
Thread.sleep(100); |
733 |
} |
734 |
|
735 |
lock.lock(); |
736 |
try { |
737 |
thread.interrupt(); |
738 |
thread.canAwake = true; |
739 |
c.signal(); |
740 |
} finally { |
741 |
lock.unlock(); |
742 |
} |
743 |
|
744 |
thread.join(); |
745 |
assertTrue(thread.interrupted); |
746 |
assertFalse(thread.isAlive()); |
747 |
} |
748 |
|
749 |
/** |
750 |
* await is interruptible |
751 |
*/ |
752 |
public void testAwait_Interrupt() throws InterruptedException { |
753 |
final ReentrantLock lock = new ReentrantLock(); |
754 |
final Condition c = lock.newCondition(); |
755 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
756 |
public void realRun() throws InterruptedException { |
757 |
lock.lock(); |
758 |
c.await(); |
759 |
}}); |
760 |
|
761 |
t.start(); |
762 |
Thread.sleep(SHORT_DELAY_MS); |
763 |
t.interrupt(); |
764 |
t.join(SHORT_DELAY_MS); |
765 |
assertFalse(t.isAlive()); |
766 |
} |
767 |
|
768 |
/** |
769 |
* awaitNanos is interruptible |
770 |
*/ |
771 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
772 |
final ReentrantLock lock = new ReentrantLock(); |
773 |
final Condition c = lock.newCondition(); |
774 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
775 |
public void realRun() throws InterruptedException { |
776 |
lock.lock(); |
777 |
c.awaitNanos(1000 * 1000 * 1000); // 1 sec |
778 |
}}); |
779 |
|
780 |
t.start(); |
781 |
Thread.sleep(SHORT_DELAY_MS); |
782 |
t.interrupt(); |
783 |
t.join(SHORT_DELAY_MS); |
784 |
assertFalse(t.isAlive()); |
785 |
} |
786 |
|
787 |
/** |
788 |
* awaitUntil is interruptible |
789 |
*/ |
790 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
791 |
final ReentrantLock lock = new ReentrantLock(); |
792 |
final Condition c = lock.newCondition(); |
793 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
794 |
public void realRun() throws InterruptedException { |
795 |
lock.lock(); |
796 |
java.util.Date d = new java.util.Date(); |
797 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
798 |
}}); |
799 |
|
800 |
t.start(); |
801 |
Thread.sleep(SHORT_DELAY_MS); |
802 |
t.interrupt(); |
803 |
t.join(SHORT_DELAY_MS); |
804 |
assertFalse(t.isAlive()); |
805 |
} |
806 |
|
807 |
/** |
808 |
* signalAll wakes up all threads |
809 |
*/ |
810 |
public void testSignalAll() throws InterruptedException { |
811 |
final ReentrantLock lock = new ReentrantLock(); |
812 |
final Condition c = lock.newCondition(); |
813 |
Thread t1 = new Thread(new CheckedRunnable() { |
814 |
public void realRun() throws InterruptedException { |
815 |
lock.lock(); |
816 |
c.await(); |
817 |
lock.unlock(); |
818 |
}}); |
819 |
|
820 |
Thread t2 = new Thread(new CheckedRunnable() { |
821 |
public void realRun() throws InterruptedException { |
822 |
lock.lock(); |
823 |
c.await(); |
824 |
lock.unlock(); |
825 |
}}); |
826 |
|
827 |
t1.start(); |
828 |
t2.start(); |
829 |
Thread.sleep(SHORT_DELAY_MS); |
830 |
lock.lock(); |
831 |
c.signalAll(); |
832 |
lock.unlock(); |
833 |
t1.join(SHORT_DELAY_MS); |
834 |
t2.join(SHORT_DELAY_MS); |
835 |
assertFalse(t1.isAlive()); |
836 |
assertFalse(t2.isAlive()); |
837 |
} |
838 |
|
839 |
/** |
840 |
* await after multiple reentrant locking preserves lock count |
841 |
*/ |
842 |
public void testAwaitLockCount() throws InterruptedException { |
843 |
final ReentrantLock lock = new ReentrantLock(); |
844 |
final Condition c = lock.newCondition(); |
845 |
Thread t1 = new Thread(new CheckedRunnable() { |
846 |
public void realRun() throws InterruptedException { |
847 |
lock.lock(); |
848 |
threadAssertEquals(1, lock.getHoldCount()); |
849 |
c.await(); |
850 |
threadAssertEquals(1, lock.getHoldCount()); |
851 |
lock.unlock(); |
852 |
}}); |
853 |
|
854 |
Thread t2 = new Thread(new CheckedRunnable() { |
855 |
public void realRun() throws InterruptedException { |
856 |
lock.lock(); |
857 |
lock.lock(); |
858 |
threadAssertEquals(2, lock.getHoldCount()); |
859 |
c.await(); |
860 |
threadAssertEquals(2, lock.getHoldCount()); |
861 |
lock.unlock(); |
862 |
lock.unlock(); |
863 |
}}); |
864 |
|
865 |
t1.start(); |
866 |
t2.start(); |
867 |
Thread.sleep(SHORT_DELAY_MS); |
868 |
lock.lock(); |
869 |
c.signalAll(); |
870 |
lock.unlock(); |
871 |
t1.join(SHORT_DELAY_MS); |
872 |
t2.join(SHORT_DELAY_MS); |
873 |
assertFalse(t1.isAlive()); |
874 |
assertFalse(t2.isAlive()); |
875 |
} |
876 |
|
877 |
/** |
878 |
* A serialized lock deserializes as unlocked |
879 |
*/ |
880 |
public void testSerialization() throws Exception { |
881 |
ReentrantLock l = new ReentrantLock(); |
882 |
l.lock(); |
883 |
l.unlock(); |
884 |
|
885 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
886 |
ObjectOutputStream out = |
887 |
new ObjectOutputStream(new BufferedOutputStream(bout)); |
888 |
out.writeObject(l); |
889 |
out.close(); |
890 |
|
891 |
ByteArrayInputStream bin = |
892 |
new ByteArrayInputStream(bout.toByteArray()); |
893 |
ObjectInputStream in = |
894 |
new ObjectInputStream(new BufferedInputStream(bin)); |
895 |
ReentrantLock r = (ReentrantLock) in.readObject(); |
896 |
r.lock(); |
897 |
r.unlock(); |
898 |
} |
899 |
|
900 |
/** |
901 |
* toString indicates current lock state |
902 |
*/ |
903 |
public void testToString() { |
904 |
ReentrantLock lock = new ReentrantLock(); |
905 |
String us = lock.toString(); |
906 |
assertTrue(us.indexOf("Unlocked") >= 0); |
907 |
lock.lock(); |
908 |
String ls = lock.toString(); |
909 |
assertTrue(ls.indexOf("Locked") >= 0); |
910 |
} |
911 |
|
912 |
} |