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 java.util.*; |
13 |
import java.io.*; |
14 |
|
15 |
public class ReentrantLockTest extends JSR166TestCase { |
16 |
public static void main(String[] args) { |
17 |
junit.textui.TestRunner.run (suite()); |
18 |
} |
19 |
public static Test suite() { |
20 |
return new TestSuite(ReentrantLockTest.class); |
21 |
} |
22 |
|
23 |
/** |
24 |
* A runnable calling lockInterruptibly |
25 |
*/ |
26 |
class InterruptibleLockRunnable implements Runnable { |
27 |
final ReentrantLock lock; |
28 |
InterruptibleLockRunnable(ReentrantLock l) { lock = l; } |
29 |
public void run() { |
30 |
try { |
31 |
lock.lockInterruptibly(); |
32 |
} catch(InterruptedException success){} |
33 |
} |
34 |
} |
35 |
|
36 |
|
37 |
/** |
38 |
* A runnable calling lockInterruptibly that expects to be |
39 |
* interrupted |
40 |
*/ |
41 |
class InterruptedLockRunnable implements Runnable { |
42 |
final ReentrantLock lock; |
43 |
InterruptedLockRunnable(ReentrantLock l) { lock = l; } |
44 |
public void run() { |
45 |
try { |
46 |
lock.lockInterruptibly(); |
47 |
threadShouldThrow(); |
48 |
} catch(InterruptedException success){} |
49 |
} |
50 |
} |
51 |
|
52 |
/** |
53 |
* Subclass to expose protected methods |
54 |
*/ |
55 |
static class PublicReentrantLock extends ReentrantLock { |
56 |
PublicReentrantLock() { super(); } |
57 |
public Collection<Thread> getQueuedThreads() { |
58 |
return super.getQueuedThreads(); |
59 |
} |
60 |
public Collection<Thread> getWaitingThreads(Condition c) { |
61 |
return super.getWaitingThreads(c); |
62 |
} |
63 |
|
64 |
|
65 |
} |
66 |
|
67 |
/** |
68 |
* Constructor sets given fairness |
69 |
*/ |
70 |
public void testConstructor() { |
71 |
ReentrantLock rl = new ReentrantLock(); |
72 |
assertFalse(rl.isFair()); |
73 |
ReentrantLock r2 = new ReentrantLock(true); |
74 |
assertTrue(r2.isFair()); |
75 |
} |
76 |
|
77 |
/** |
78 |
* locking an unlocked lock succeeds |
79 |
*/ |
80 |
public void testLock() { |
81 |
ReentrantLock rl = new ReentrantLock(); |
82 |
rl.lock(); |
83 |
assertTrue(rl.isLocked()); |
84 |
rl.unlock(); |
85 |
} |
86 |
|
87 |
/** |
88 |
* locking an unlocked fair lock succeeds |
89 |
*/ |
90 |
public void testFairLock() { |
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ReentrantLock rl = new ReentrantLock(true); |
92 |
rl.lock(); |
93 |
assertTrue(rl.isLocked()); |
94 |
rl.unlock(); |
95 |
} |
96 |
|
97 |
/** |
98 |
* Unlocking an unlocked lock throws IllegalMonitorStateException |
99 |
*/ |
100 |
public void testUnlock_IllegalMonitorStateException() { |
101 |
ReentrantLock rl = new ReentrantLock(); |
102 |
try { |
103 |
rl.unlock(); |
104 |
shouldThrow(); |
105 |
|
106 |
} catch(IllegalMonitorStateException success){} |
107 |
} |
108 |
|
109 |
/** |
110 |
* tryLock on an unlocked lock succeeds |
111 |
*/ |
112 |
public void testTryLock() { |
113 |
ReentrantLock rl = new ReentrantLock(); |
114 |
assertTrue(rl.tryLock()); |
115 |
assertTrue(rl.isLocked()); |
116 |
rl.unlock(); |
117 |
} |
118 |
|
119 |
|
120 |
/** |
121 |
* hasQueuedThreads reports whether there are waiting threads |
122 |
*/ |
123 |
public void testhasQueuedThreads() { |
124 |
final ReentrantLock lock = new ReentrantLock(); |
125 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
126 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
127 |
try { |
128 |
assertFalse(lock.hasQueuedThreads()); |
129 |
lock.lock(); |
130 |
t1.start(); |
131 |
Thread.sleep(SHORT_DELAY_MS); |
132 |
assertTrue(lock.hasQueuedThreads()); |
133 |
t2.start(); |
134 |
Thread.sleep(SHORT_DELAY_MS); |
135 |
assertTrue(lock.hasQueuedThreads()); |
136 |
t1.interrupt(); |
137 |
Thread.sleep(SHORT_DELAY_MS); |
138 |
assertTrue(lock.hasQueuedThreads()); |
139 |
lock.unlock(); |
140 |
Thread.sleep(SHORT_DELAY_MS); |
141 |
assertFalse(lock.hasQueuedThreads()); |
142 |
t1.join(); |
143 |
t2.join(); |
144 |
} catch(Exception e){ |
145 |
unexpectedException(); |
146 |
} |
147 |
} |
148 |
|
149 |
/** |
150 |
* getQueueLength reports number of waiting threads |
151 |
*/ |
152 |
public void testGetQueueLength() { |
153 |
final ReentrantLock lock = new ReentrantLock(); |
154 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
155 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
156 |
try { |
157 |
assertEquals(0, lock.getQueueLength()); |
158 |
lock.lock(); |
159 |
t1.start(); |
160 |
Thread.sleep(SHORT_DELAY_MS); |
161 |
assertEquals(1, lock.getQueueLength()); |
162 |
t2.start(); |
163 |
Thread.sleep(SHORT_DELAY_MS); |
164 |
assertEquals(2, lock.getQueueLength()); |
165 |
t1.interrupt(); |
166 |
Thread.sleep(SHORT_DELAY_MS); |
167 |
assertEquals(1, lock.getQueueLength()); |
168 |
lock.unlock(); |
169 |
Thread.sleep(SHORT_DELAY_MS); |
170 |
assertEquals(0, lock.getQueueLength()); |
171 |
t1.join(); |
172 |
t2.join(); |
173 |
} catch(Exception e){ |
174 |
unexpectedException(); |
175 |
} |
176 |
} |
177 |
|
178 |
/** |
179 |
* getQueueLength reports number of waiting threads |
180 |
*/ |
181 |
public void testGetQueueLength_fair() { |
182 |
final ReentrantLock lock = new ReentrantLock(true); |
183 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
184 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
185 |
try { |
186 |
assertEquals(0, lock.getQueueLength()); |
187 |
lock.lock(); |
188 |
t1.start(); |
189 |
Thread.sleep(SHORT_DELAY_MS); |
190 |
assertEquals(1, lock.getQueueLength()); |
191 |
t2.start(); |
192 |
Thread.sleep(SHORT_DELAY_MS); |
193 |
assertEquals(2, lock.getQueueLength()); |
194 |
t1.interrupt(); |
195 |
Thread.sleep(SHORT_DELAY_MS); |
196 |
assertEquals(1, lock.getQueueLength()); |
197 |
lock.unlock(); |
198 |
Thread.sleep(SHORT_DELAY_MS); |
199 |
assertEquals(0, lock.getQueueLength()); |
200 |
t1.join(); |
201 |
t2.join(); |
202 |
} catch(Exception e){ |
203 |
unexpectedException(); |
204 |
} |
205 |
} |
206 |
|
207 |
/** |
208 |
* hasQueuedThread(null) throws NPE |
209 |
*/ |
210 |
public void testHasQueuedThreadNPE() { |
211 |
final ReentrantLock sync = new ReentrantLock(); |
212 |
try { |
213 |
sync.hasQueuedThread(null); |
214 |
shouldThrow(); |
215 |
} catch (NullPointerException success) { |
216 |
} |
217 |
} |
218 |
|
219 |
/** |
220 |
* hasQueuedThread reports whether a thread is queued. |
221 |
*/ |
222 |
public void testHasQueuedThread() { |
223 |
final ReentrantLock sync = new ReentrantLock(); |
224 |
Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
225 |
Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
226 |
try { |
227 |
assertFalse(sync.hasQueuedThread(t1)); |
228 |
assertFalse(sync.hasQueuedThread(t2)); |
229 |
sync.lock(); |
230 |
t1.start(); |
231 |
Thread.sleep(SHORT_DELAY_MS); |
232 |
assertTrue(sync.hasQueuedThread(t1)); |
233 |
t2.start(); |
234 |
Thread.sleep(SHORT_DELAY_MS); |
235 |
assertTrue(sync.hasQueuedThread(t1)); |
236 |
assertTrue(sync.hasQueuedThread(t2)); |
237 |
t1.interrupt(); |
238 |
Thread.sleep(SHORT_DELAY_MS); |
239 |
assertFalse(sync.hasQueuedThread(t1)); |
240 |
assertTrue(sync.hasQueuedThread(t2)); |
241 |
sync.unlock(); |
242 |
Thread.sleep(SHORT_DELAY_MS); |
243 |
assertFalse(sync.hasQueuedThread(t1)); |
244 |
Thread.sleep(SHORT_DELAY_MS); |
245 |
assertFalse(sync.hasQueuedThread(t2)); |
246 |
t1.join(); |
247 |
t2.join(); |
248 |
} catch(Exception e){ |
249 |
unexpectedException(); |
250 |
} |
251 |
} |
252 |
|
253 |
|
254 |
/** |
255 |
* getQueuedThreads includes waiting threads |
256 |
*/ |
257 |
public void testGetQueuedThreads() { |
258 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
259 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
260 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
261 |
try { |
262 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
263 |
lock.lock(); |
264 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
265 |
t1.start(); |
266 |
Thread.sleep(SHORT_DELAY_MS); |
267 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
268 |
t2.start(); |
269 |
Thread.sleep(SHORT_DELAY_MS); |
270 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
271 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
272 |
t1.interrupt(); |
273 |
Thread.sleep(SHORT_DELAY_MS); |
274 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
275 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
276 |
lock.unlock(); |
277 |
Thread.sleep(SHORT_DELAY_MS); |
278 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
279 |
t1.join(); |
280 |
t2.join(); |
281 |
} catch(Exception e){ |
282 |
unexpectedException(); |
283 |
} |
284 |
} |
285 |
|
286 |
|
287 |
/** |
288 |
* timed tryLock is interruptible. |
289 |
*/ |
290 |
public void testInterruptedException2() { |
291 |
final ReentrantLock lock = new ReentrantLock(); |
292 |
lock.lock(); |
293 |
Thread t = new Thread(new Runnable() { |
294 |
public void run() { |
295 |
try { |
296 |
lock.tryLock(MEDIUM_DELAY_MS,TimeUnit.MILLISECONDS); |
297 |
threadShouldThrow(); |
298 |
} catch(InterruptedException success){} |
299 |
} |
300 |
}); |
301 |
try { |
302 |
t.start(); |
303 |
t.interrupt(); |
304 |
} catch(Exception e){ |
305 |
unexpectedException(); |
306 |
} |
307 |
} |
308 |
|
309 |
|
310 |
/** |
311 |
* TryLock on a locked lock fails |
312 |
*/ |
313 |
public void testTryLockWhenLocked() { |
314 |
final ReentrantLock lock = new ReentrantLock(); |
315 |
lock.lock(); |
316 |
Thread t = new Thread(new Runnable() { |
317 |
public void run() { |
318 |
threadAssertFalse(lock.tryLock()); |
319 |
} |
320 |
}); |
321 |
try { |
322 |
t.start(); |
323 |
t.join(); |
324 |
lock.unlock(); |
325 |
} catch(Exception e){ |
326 |
unexpectedException(); |
327 |
} |
328 |
} |
329 |
|
330 |
/** |
331 |
* Timed tryLock on a locked lock times out |
332 |
*/ |
333 |
public void testTryLock_Timeout() { |
334 |
final ReentrantLock lock = new ReentrantLock(); |
335 |
lock.lock(); |
336 |
Thread t = new Thread(new Runnable() { |
337 |
public void run() { |
338 |
try { |
339 |
threadAssertFalse(lock.tryLock(1, TimeUnit.MILLISECONDS)); |
340 |
} catch (Exception ex) { |
341 |
threadUnexpectedException(); |
342 |
} |
343 |
} |
344 |
}); |
345 |
try { |
346 |
t.start(); |
347 |
t.join(); |
348 |
lock.unlock(); |
349 |
} catch(Exception e){ |
350 |
unexpectedException(); |
351 |
} |
352 |
} |
353 |
|
354 |
/** |
355 |
* getHoldCount returns number of recursive holds |
356 |
*/ |
357 |
public void testGetHoldCount() { |
358 |
ReentrantLock lock = new ReentrantLock(); |
359 |
for(int i = 1; i <= SIZE; i++) { |
360 |
lock.lock(); |
361 |
assertEquals(i,lock.getHoldCount()); |
362 |
} |
363 |
for(int i = SIZE; i > 0; i--) { |
364 |
lock.unlock(); |
365 |
assertEquals(i-1,lock.getHoldCount()); |
366 |
} |
367 |
} |
368 |
|
369 |
|
370 |
/** |
371 |
* isLocked is true when locked and false when not |
372 |
*/ |
373 |
public void testIsLocked() { |
374 |
final ReentrantLock lock = new ReentrantLock(); |
375 |
lock.lock(); |
376 |
assertTrue(lock.isLocked()); |
377 |
lock.unlock(); |
378 |
assertFalse(lock.isLocked()); |
379 |
Thread t = new Thread(new Runnable() { |
380 |
public void run() { |
381 |
lock.lock(); |
382 |
try { |
383 |
Thread.sleep(SMALL_DELAY_MS); |
384 |
} |
385 |
catch(Exception e) { |
386 |
threadUnexpectedException(); |
387 |
} |
388 |
lock.unlock(); |
389 |
} |
390 |
}); |
391 |
try { |
392 |
t.start(); |
393 |
Thread.sleep(SHORT_DELAY_MS); |
394 |
assertTrue(lock.isLocked()); |
395 |
t.join(); |
396 |
assertFalse(lock.isLocked()); |
397 |
} catch(Exception e){ |
398 |
unexpectedException(); |
399 |
} |
400 |
} |
401 |
|
402 |
|
403 |
/** |
404 |
* lockInterruptibly is interruptible. |
405 |
*/ |
406 |
public void testLockInterruptibly1() { |
407 |
final ReentrantLock lock = new ReentrantLock(); |
408 |
lock.lock(); |
409 |
Thread t = new Thread(new InterruptedLockRunnable(lock)); |
410 |
try { |
411 |
t.start(); |
412 |
Thread.sleep(SHORT_DELAY_MS); |
413 |
t.interrupt(); |
414 |
lock.unlock(); |
415 |
t.join(); |
416 |
} catch(Exception e){ |
417 |
unexpectedException(); |
418 |
} |
419 |
} |
420 |
|
421 |
/** |
422 |
* lockInterruptibly succeeds when unlocked, else is interruptible |
423 |
*/ |
424 |
public void testLockInterruptibly2() { |
425 |
final ReentrantLock lock = new ReentrantLock(); |
426 |
try { |
427 |
lock.lockInterruptibly(); |
428 |
} catch(Exception e) { |
429 |
unexpectedException(); |
430 |
} |
431 |
Thread t = new Thread(new InterruptedLockRunnable(lock)); |
432 |
try { |
433 |
t.start(); |
434 |
t.interrupt(); |
435 |
assertTrue(lock.isLocked()); |
436 |
assertTrue(lock.isHeldByCurrentThread()); |
437 |
t.join(); |
438 |
} catch(Exception e){ |
439 |
unexpectedException(); |
440 |
} |
441 |
} |
442 |
|
443 |
/** |
444 |
* Calling await without holding lock throws IllegalMonitorStateException |
445 |
*/ |
446 |
public void testAwait_IllegalMonitor() { |
447 |
final ReentrantLock lock = new ReentrantLock(); |
448 |
final Condition c = lock.newCondition(); |
449 |
try { |
450 |
c.await(); |
451 |
shouldThrow(); |
452 |
} |
453 |
catch (IllegalMonitorStateException success) { |
454 |
} |
455 |
catch (Exception ex) { |
456 |
unexpectedException(); |
457 |
} |
458 |
} |
459 |
|
460 |
/** |
461 |
* Calling signal without holding lock throws IllegalMonitorStateException |
462 |
*/ |
463 |
public void testSignal_IllegalMonitor() { |
464 |
final ReentrantLock lock = new ReentrantLock(); |
465 |
final Condition c = lock.newCondition(); |
466 |
try { |
467 |
c.signal(); |
468 |
shouldThrow(); |
469 |
} |
470 |
catch (IllegalMonitorStateException success) { |
471 |
} |
472 |
catch (Exception ex) { |
473 |
unexpectedException(); |
474 |
} |
475 |
} |
476 |
|
477 |
/** |
478 |
* awaitNanos without a signal times out |
479 |
*/ |
480 |
public void testAwaitNanos_Timeout() { |
481 |
final ReentrantLock lock = new ReentrantLock(); |
482 |
final Condition c = lock.newCondition(); |
483 |
try { |
484 |
lock.lock(); |
485 |
long t = c.awaitNanos(100); |
486 |
assertTrue(t <= 0); |
487 |
lock.unlock(); |
488 |
} |
489 |
catch (Exception ex) { |
490 |
unexpectedException(); |
491 |
} |
492 |
} |
493 |
|
494 |
/** |
495 |
* timed await without a signal times out |
496 |
*/ |
497 |
public void testAwait_Timeout() { |
498 |
final ReentrantLock lock = new ReentrantLock(); |
499 |
final Condition c = lock.newCondition(); |
500 |
try { |
501 |
lock.lock(); |
502 |
c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
503 |
lock.unlock(); |
504 |
} |
505 |
catch (Exception ex) { |
506 |
unexpectedException(); |
507 |
} |
508 |
} |
509 |
|
510 |
/** |
511 |
* awaitUntil without a signal times out |
512 |
*/ |
513 |
public void testAwaitUntil_Timeout() { |
514 |
final ReentrantLock lock = new ReentrantLock(); |
515 |
final Condition c = lock.newCondition(); |
516 |
try { |
517 |
lock.lock(); |
518 |
java.util.Date d = new java.util.Date(); |
519 |
c.awaitUntil(new java.util.Date(d.getTime() + 10)); |
520 |
lock.unlock(); |
521 |
} |
522 |
catch (Exception ex) { |
523 |
unexpectedException(); |
524 |
} |
525 |
} |
526 |
|
527 |
/** |
528 |
* await returns when signalled |
529 |
*/ |
530 |
public void testAwait() { |
531 |
final ReentrantLock lock = new ReentrantLock(); |
532 |
final Condition c = lock.newCondition(); |
533 |
Thread t = new Thread(new Runnable() { |
534 |
public void run() { |
535 |
try { |
536 |
lock.lock(); |
537 |
c.await(); |
538 |
lock.unlock(); |
539 |
} |
540 |
catch(InterruptedException e) { |
541 |
threadUnexpectedException(); |
542 |
} |
543 |
} |
544 |
}); |
545 |
|
546 |
try { |
547 |
t.start(); |
548 |
Thread.sleep(SHORT_DELAY_MS); |
549 |
lock.lock(); |
550 |
c.signal(); |
551 |
lock.unlock(); |
552 |
t.join(SHORT_DELAY_MS); |
553 |
assertFalse(t.isAlive()); |
554 |
} |
555 |
catch (Exception ex) { |
556 |
unexpectedException(); |
557 |
} |
558 |
} |
559 |
|
560 |
/** |
561 |
* hasWaiters throws NPE if null |
562 |
*/ |
563 |
public void testHasWaitersNPE() { |
564 |
final ReentrantLock lock = new ReentrantLock(); |
565 |
try { |
566 |
lock.hasWaiters(null); |
567 |
shouldThrow(); |
568 |
} catch (NullPointerException success) { |
569 |
} catch (Exception ex) { |
570 |
unexpectedException(); |
571 |
} |
572 |
} |
573 |
|
574 |
/** |
575 |
* getWaitQueueLength throws NPE if null |
576 |
*/ |
577 |
public void testGetWaitQueueLengthNPE() { |
578 |
final ReentrantLock lock = new ReentrantLock(); |
579 |
try { |
580 |
lock.getWaitQueueLength(null); |
581 |
shouldThrow(); |
582 |
} catch (NullPointerException success) { |
583 |
} catch (Exception ex) { |
584 |
unexpectedException(); |
585 |
} |
586 |
} |
587 |
|
588 |
|
589 |
/** |
590 |
* getWaitingThreads throws NPE if null |
591 |
*/ |
592 |
public void testGetWaitingThreadsNPE() { |
593 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
594 |
try { |
595 |
lock.getWaitingThreads(null); |
596 |
shouldThrow(); |
597 |
} catch (NullPointerException success) { |
598 |
} catch (Exception ex) { |
599 |
unexpectedException(); |
600 |
} |
601 |
} |
602 |
|
603 |
|
604 |
/** |
605 |
* hasWaiters throws IAE if not owned |
606 |
*/ |
607 |
public void testHasWaitersIAE() { |
608 |
final ReentrantLock lock = new ReentrantLock(); |
609 |
final Condition c = (lock.newCondition()); |
610 |
final ReentrantLock lock2 = new ReentrantLock(); |
611 |
try { |
612 |
lock2.hasWaiters(c); |
613 |
shouldThrow(); |
614 |
} catch (IllegalArgumentException success) { |
615 |
} catch (Exception ex) { |
616 |
unexpectedException(); |
617 |
} |
618 |
} |
619 |
|
620 |
/** |
621 |
* hasWaiters throws IMSE if not locked |
622 |
*/ |
623 |
public void testHasWaitersIMSE() { |
624 |
final ReentrantLock lock = new ReentrantLock(); |
625 |
final Condition c = (lock.newCondition()); |
626 |
try { |
627 |
lock.hasWaiters(c); |
628 |
shouldThrow(); |
629 |
} catch (IllegalMonitorStateException success) { |
630 |
} catch (Exception ex) { |
631 |
unexpectedException(); |
632 |
} |
633 |
} |
634 |
|
635 |
|
636 |
/** |
637 |
* getWaitQueueLength throws IAE if not owned |
638 |
*/ |
639 |
public void testGetWaitQueueLengthIAE() { |
640 |
final ReentrantLock lock = new ReentrantLock(); |
641 |
final Condition c = (lock.newCondition()); |
642 |
final ReentrantLock lock2 = new ReentrantLock(); |
643 |
try { |
644 |
lock2.getWaitQueueLength(c); |
645 |
shouldThrow(); |
646 |
} catch (IllegalArgumentException success) { |
647 |
} catch (Exception ex) { |
648 |
unexpectedException(); |
649 |
} |
650 |
} |
651 |
|
652 |
/** |
653 |
* getWaitQueueLength throws IMSE if not locked |
654 |
*/ |
655 |
public void testGetWaitQueueLengthIMSE() { |
656 |
final ReentrantLock lock = new ReentrantLock(); |
657 |
final Condition c = (lock.newCondition()); |
658 |
try { |
659 |
lock.getWaitQueueLength(c); |
660 |
shouldThrow(); |
661 |
} catch (IllegalMonitorStateException success) { |
662 |
} catch (Exception ex) { |
663 |
unexpectedException(); |
664 |
} |
665 |
} |
666 |
|
667 |
|
668 |
/** |
669 |
* getWaitingThreads throws IAE if not owned |
670 |
*/ |
671 |
public void testGetWaitingThreadsIAE() { |
672 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
673 |
final Condition c = (lock.newCondition()); |
674 |
final PublicReentrantLock lock2 = new PublicReentrantLock(); |
675 |
try { |
676 |
lock2.getWaitingThreads(c); |
677 |
shouldThrow(); |
678 |
} catch (IllegalArgumentException success) { |
679 |
} catch (Exception ex) { |
680 |
unexpectedException(); |
681 |
} |
682 |
} |
683 |
|
684 |
/** |
685 |
* getWaitingThreads throws IMSE if not locked |
686 |
*/ |
687 |
public void testGetWaitingThreadsIMSE() { |
688 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
689 |
final Condition c = (lock.newCondition()); |
690 |
try { |
691 |
lock.getWaitingThreads(c); |
692 |
shouldThrow(); |
693 |
} catch (IllegalMonitorStateException success) { |
694 |
} catch (Exception ex) { |
695 |
unexpectedException(); |
696 |
} |
697 |
} |
698 |
|
699 |
|
700 |
|
701 |
/** |
702 |
* hasWaiters returns true when a thread is waiting, else false |
703 |
*/ |
704 |
public void testHasWaiters() { |
705 |
final ReentrantLock lock = new ReentrantLock(); |
706 |
final Condition c = lock.newCondition(); |
707 |
Thread t = new Thread(new Runnable() { |
708 |
public void run() { |
709 |
try { |
710 |
lock.lock(); |
711 |
threadAssertFalse(lock.hasWaiters(c)); |
712 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
713 |
c.await(); |
714 |
lock.unlock(); |
715 |
} |
716 |
catch(InterruptedException e) { |
717 |
threadUnexpectedException(); |
718 |
} |
719 |
} |
720 |
}); |
721 |
|
722 |
try { |
723 |
t.start(); |
724 |
Thread.sleep(SHORT_DELAY_MS); |
725 |
lock.lock(); |
726 |
assertTrue(lock.hasWaiters(c)); |
727 |
assertEquals(1, lock.getWaitQueueLength(c)); |
728 |
c.signal(); |
729 |
lock.unlock(); |
730 |
Thread.sleep(SHORT_DELAY_MS); |
731 |
lock.lock(); |
732 |
assertFalse(lock.hasWaiters(c)); |
733 |
assertEquals(0, lock.getWaitQueueLength(c)); |
734 |
lock.unlock(); |
735 |
t.join(SHORT_DELAY_MS); |
736 |
assertFalse(t.isAlive()); |
737 |
} |
738 |
catch (Exception ex) { |
739 |
unexpectedException(); |
740 |
} |
741 |
} |
742 |
|
743 |
/** |
744 |
* getWaitQueueLength returns number of waiting threads |
745 |
*/ |
746 |
public void testGetWaitQueueLength() { |
747 |
final ReentrantLock lock = new ReentrantLock(); |
748 |
final Condition c = lock.newCondition(); |
749 |
Thread t1 = new Thread(new Runnable() { |
750 |
public void run() { |
751 |
try { |
752 |
lock.lock(); |
753 |
threadAssertFalse(lock.hasWaiters(c)); |
754 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
755 |
c.await(); |
756 |
lock.unlock(); |
757 |
} |
758 |
catch(InterruptedException e) { |
759 |
threadUnexpectedException(); |
760 |
} |
761 |
} |
762 |
}); |
763 |
|
764 |
Thread t2 = new Thread(new Runnable() { |
765 |
public void run() { |
766 |
try { |
767 |
lock.lock(); |
768 |
threadAssertTrue(lock.hasWaiters(c)); |
769 |
threadAssertEquals(1, lock.getWaitQueueLength(c)); |
770 |
c.await(); |
771 |
lock.unlock(); |
772 |
} |
773 |
catch(InterruptedException e) { |
774 |
threadUnexpectedException(); |
775 |
} |
776 |
} |
777 |
}); |
778 |
|
779 |
try { |
780 |
t1.start(); |
781 |
Thread.sleep(SHORT_DELAY_MS); |
782 |
t2.start(); |
783 |
Thread.sleep(SHORT_DELAY_MS); |
784 |
lock.lock(); |
785 |
assertTrue(lock.hasWaiters(c)); |
786 |
assertEquals(2, lock.getWaitQueueLength(c)); |
787 |
c.signalAll(); |
788 |
lock.unlock(); |
789 |
Thread.sleep(SHORT_DELAY_MS); |
790 |
lock.lock(); |
791 |
assertFalse(lock.hasWaiters(c)); |
792 |
assertEquals(0, lock.getWaitQueueLength(c)); |
793 |
lock.unlock(); |
794 |
t1.join(SHORT_DELAY_MS); |
795 |
t2.join(SHORT_DELAY_MS); |
796 |
assertFalse(t1.isAlive()); |
797 |
assertFalse(t2.isAlive()); |
798 |
} |
799 |
catch (Exception ex) { |
800 |
unexpectedException(); |
801 |
} |
802 |
} |
803 |
|
804 |
/** |
805 |
* getWaitingThreads returns only and all waiting threads |
806 |
*/ |
807 |
public void testGetWaitingThreads() { |
808 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
809 |
final Condition c = lock.newCondition(); |
810 |
Thread t1 = new Thread(new Runnable() { |
811 |
public void run() { |
812 |
try { |
813 |
lock.lock(); |
814 |
threadAssertTrue(lock.getWaitingThreads(c).isEmpty()); |
815 |
c.await(); |
816 |
lock.unlock(); |
817 |
} |
818 |
catch(InterruptedException e) { |
819 |
threadUnexpectedException(); |
820 |
} |
821 |
} |
822 |
}); |
823 |
|
824 |
Thread t2 = new Thread(new Runnable() { |
825 |
public void run() { |
826 |
try { |
827 |
lock.lock(); |
828 |
threadAssertFalse(lock.getWaitingThreads(c).isEmpty()); |
829 |
c.await(); |
830 |
lock.unlock(); |
831 |
} |
832 |
catch(InterruptedException e) { |
833 |
threadUnexpectedException(); |
834 |
} |
835 |
} |
836 |
}); |
837 |
|
838 |
try { |
839 |
lock.lock(); |
840 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
841 |
lock.unlock(); |
842 |
t1.start(); |
843 |
Thread.sleep(SHORT_DELAY_MS); |
844 |
t2.start(); |
845 |
Thread.sleep(SHORT_DELAY_MS); |
846 |
lock.lock(); |
847 |
assertTrue(lock.hasWaiters(c)); |
848 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
849 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
850 |
c.signalAll(); |
851 |
lock.unlock(); |
852 |
Thread.sleep(SHORT_DELAY_MS); |
853 |
lock.lock(); |
854 |
assertFalse(lock.hasWaiters(c)); |
855 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
856 |
lock.unlock(); |
857 |
t1.join(SHORT_DELAY_MS); |
858 |
t2.join(SHORT_DELAY_MS); |
859 |
assertFalse(t1.isAlive()); |
860 |
assertFalse(t2.isAlive()); |
861 |
} |
862 |
catch (Exception ex) { |
863 |
unexpectedException(); |
864 |
} |
865 |
} |
866 |
|
867 |
/** A helper class for uninterruptible wait tests */ |
868 |
class UninterruptableThread extends Thread { |
869 |
private ReentrantLock lock; |
870 |
private Condition c; |
871 |
|
872 |
public volatile boolean canAwake = false; |
873 |
public volatile boolean interrupted = false; |
874 |
public volatile boolean lockStarted = false; |
875 |
|
876 |
public UninterruptableThread(ReentrantLock lock, Condition c) { |
877 |
this.lock = lock; |
878 |
this.c = c; |
879 |
} |
880 |
|
881 |
public synchronized void run() { |
882 |
lock.lock(); |
883 |
lockStarted = true; |
884 |
|
885 |
while (!canAwake) { |
886 |
c.awaitUninterruptibly(); |
887 |
} |
888 |
|
889 |
interrupted = isInterrupted(); |
890 |
lock.unlock(); |
891 |
} |
892 |
} |
893 |
|
894 |
/** |
895 |
* awaitUninterruptibly doesn't abort on interrupt |
896 |
*/ |
897 |
public void testAwaitUninterruptibly() { |
898 |
final ReentrantLock lock = new ReentrantLock(); |
899 |
final Condition c = lock.newCondition(); |
900 |
UninterruptableThread thread = new UninterruptableThread(lock, c); |
901 |
|
902 |
try { |
903 |
thread.start(); |
904 |
|
905 |
while (!thread.lockStarted) { |
906 |
Thread.sleep(100); |
907 |
} |
908 |
|
909 |
lock.lock(); |
910 |
try { |
911 |
thread.interrupt(); |
912 |
thread.canAwake = true; |
913 |
c.signal(); |
914 |
} finally { |
915 |
lock.unlock(); |
916 |
} |
917 |
|
918 |
thread.join(); |
919 |
assertTrue(thread.interrupted); |
920 |
assertFalse(thread.isAlive()); |
921 |
} catch (Exception ex) { |
922 |
unexpectedException(); |
923 |
} |
924 |
} |
925 |
|
926 |
/** |
927 |
* await is interruptible |
928 |
*/ |
929 |
public void testAwait_Interrupt() { |
930 |
final ReentrantLock lock = new ReentrantLock(); |
931 |
final Condition c = lock.newCondition(); |
932 |
Thread t = new Thread(new Runnable() { |
933 |
public void run() { |
934 |
try { |
935 |
lock.lock(); |
936 |
c.await(); |
937 |
lock.unlock(); |
938 |
threadShouldThrow(); |
939 |
} |
940 |
catch(InterruptedException success) { |
941 |
} |
942 |
} |
943 |
}); |
944 |
|
945 |
try { |
946 |
t.start(); |
947 |
Thread.sleep(SHORT_DELAY_MS); |
948 |
t.interrupt(); |
949 |
t.join(SHORT_DELAY_MS); |
950 |
assertFalse(t.isAlive()); |
951 |
} |
952 |
catch (Exception ex) { |
953 |
unexpectedException(); |
954 |
} |
955 |
} |
956 |
|
957 |
/** |
958 |
* awaitNanos is interruptible |
959 |
*/ |
960 |
public void testAwaitNanos_Interrupt() { |
961 |
final ReentrantLock lock = new ReentrantLock(); |
962 |
final Condition c = lock.newCondition(); |
963 |
Thread t = new Thread(new Runnable() { |
964 |
public void run() { |
965 |
try { |
966 |
lock.lock(); |
967 |
c.awaitNanos(1000 * 1000 * 1000); // 1 sec |
968 |
lock.unlock(); |
969 |
threadShouldThrow(); |
970 |
} |
971 |
catch(InterruptedException success) { |
972 |
} |
973 |
} |
974 |
}); |
975 |
|
976 |
try { |
977 |
t.start(); |
978 |
Thread.sleep(SHORT_DELAY_MS); |
979 |
t.interrupt(); |
980 |
t.join(SHORT_DELAY_MS); |
981 |
assertFalse(t.isAlive()); |
982 |
} |
983 |
catch (Exception ex) { |
984 |
unexpectedException(); |
985 |
} |
986 |
} |
987 |
|
988 |
/** |
989 |
* awaitUntil is interruptible |
990 |
*/ |
991 |
public void testAwaitUntil_Interrupt() { |
992 |
final ReentrantLock lock = new ReentrantLock(); |
993 |
final Condition c = lock.newCondition(); |
994 |
Thread t = new Thread(new Runnable() { |
995 |
public void run() { |
996 |
try { |
997 |
lock.lock(); |
998 |
java.util.Date d = new java.util.Date(); |
999 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
1000 |
lock.unlock(); |
1001 |
threadShouldThrow(); |
1002 |
} |
1003 |
catch(InterruptedException success) { |
1004 |
} |
1005 |
} |
1006 |
}); |
1007 |
|
1008 |
try { |
1009 |
t.start(); |
1010 |
Thread.sleep(SHORT_DELAY_MS); |
1011 |
t.interrupt(); |
1012 |
t.join(SHORT_DELAY_MS); |
1013 |
assertFalse(t.isAlive()); |
1014 |
} |
1015 |
catch (Exception ex) { |
1016 |
unexpectedException(); |
1017 |
} |
1018 |
} |
1019 |
|
1020 |
/** |
1021 |
* signalAll wakes up all threads |
1022 |
*/ |
1023 |
public void testSignalAll() { |
1024 |
final ReentrantLock lock = new ReentrantLock(); |
1025 |
final Condition c = lock.newCondition(); |
1026 |
Thread t1 = new Thread(new Runnable() { |
1027 |
public void run() { |
1028 |
try { |
1029 |
lock.lock(); |
1030 |
c.await(); |
1031 |
lock.unlock(); |
1032 |
} |
1033 |
catch(InterruptedException e) { |
1034 |
threadUnexpectedException(); |
1035 |
} |
1036 |
} |
1037 |
}); |
1038 |
|
1039 |
Thread t2 = new Thread(new Runnable() { |
1040 |
public void run() { |
1041 |
try { |
1042 |
lock.lock(); |
1043 |
c.await(); |
1044 |
lock.unlock(); |
1045 |
} |
1046 |
catch(InterruptedException e) { |
1047 |
threadUnexpectedException(); |
1048 |
} |
1049 |
} |
1050 |
}); |
1051 |
|
1052 |
try { |
1053 |
t1.start(); |
1054 |
t2.start(); |
1055 |
Thread.sleep(SHORT_DELAY_MS); |
1056 |
lock.lock(); |
1057 |
c.signalAll(); |
1058 |
lock.unlock(); |
1059 |
t1.join(SHORT_DELAY_MS); |
1060 |
t2.join(SHORT_DELAY_MS); |
1061 |
assertFalse(t1.isAlive()); |
1062 |
assertFalse(t2.isAlive()); |
1063 |
} |
1064 |
catch (Exception ex) { |
1065 |
unexpectedException(); |
1066 |
} |
1067 |
} |
1068 |
|
1069 |
/** |
1070 |
* await after multiple reentrant locking preserves lock count |
1071 |
*/ |
1072 |
public void testAwaitLockCount() { |
1073 |
final ReentrantLock lock = new ReentrantLock(); |
1074 |
final Condition c = lock.newCondition(); |
1075 |
Thread t1 = new Thread(new Runnable() { |
1076 |
public void run() { |
1077 |
try { |
1078 |
lock.lock(); |
1079 |
threadAssertEquals(1, lock.getHoldCount()); |
1080 |
c.await(); |
1081 |
threadAssertEquals(1, lock.getHoldCount()); |
1082 |
lock.unlock(); |
1083 |
} |
1084 |
catch(InterruptedException e) { |
1085 |
threadUnexpectedException(); |
1086 |
} |
1087 |
} |
1088 |
}); |
1089 |
|
1090 |
Thread t2 = new Thread(new Runnable() { |
1091 |
public void run() { |
1092 |
try { |
1093 |
lock.lock(); |
1094 |
lock.lock(); |
1095 |
threadAssertEquals(2, lock.getHoldCount()); |
1096 |
c.await(); |
1097 |
threadAssertEquals(2, lock.getHoldCount()); |
1098 |
lock.unlock(); |
1099 |
lock.unlock(); |
1100 |
} |
1101 |
catch(InterruptedException e) { |
1102 |
threadUnexpectedException(); |
1103 |
} |
1104 |
} |
1105 |
}); |
1106 |
|
1107 |
try { |
1108 |
t1.start(); |
1109 |
t2.start(); |
1110 |
Thread.sleep(SHORT_DELAY_MS); |
1111 |
lock.lock(); |
1112 |
c.signalAll(); |
1113 |
lock.unlock(); |
1114 |
t1.join(SHORT_DELAY_MS); |
1115 |
t2.join(SHORT_DELAY_MS); |
1116 |
assertFalse(t1.isAlive()); |
1117 |
assertFalse(t2.isAlive()); |
1118 |
} |
1119 |
catch (Exception ex) { |
1120 |
unexpectedException(); |
1121 |
} |
1122 |
} |
1123 |
|
1124 |
/** |
1125 |
* A serialized lock deserializes as unlocked |
1126 |
*/ |
1127 |
public void testSerialization() { |
1128 |
ReentrantLock l = new ReentrantLock(); |
1129 |
l.lock(); |
1130 |
l.unlock(); |
1131 |
|
1132 |
try { |
1133 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
1134 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
1135 |
out.writeObject(l); |
1136 |
out.close(); |
1137 |
|
1138 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
1139 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
1140 |
ReentrantLock r = (ReentrantLock) in.readObject(); |
1141 |
r.lock(); |
1142 |
r.unlock(); |
1143 |
} catch(Exception e){ |
1144 |
e.printStackTrace(); |
1145 |
unexpectedException(); |
1146 |
} |
1147 |
} |
1148 |
|
1149 |
/** |
1150 |
* toString indicates current lock state |
1151 |
*/ |
1152 |
public void testToString() { |
1153 |
ReentrantLock lock = new ReentrantLock(); |
1154 |
String us = lock.toString(); |
1155 |
assertTrue(us.indexOf("Unlocked") >= 0); |
1156 |
lock.lock(); |
1157 |
String ls = lock.toString(); |
1158 |
assertTrue(ls.indexOf("Locked") >= 0); |
1159 |
} |
1160 |
|
1161 |
} |