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 |
|
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import junit.framework.*; |
10 |
import java.util.concurrent.locks.*; |
11 |
import java.util.concurrent.*; |
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import java.util.*; |
13 |
import java.io.*; |
14 |
|
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public class ReentrantLockTest extends JSR166TestCase { |
16 |
public static void main(String[] args) { |
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junit.textui.TestRunner.run (suite()); |
18 |
} |
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public static Test suite() { |
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return new TestSuite(ReentrantLockTest.class); |
21 |
} |
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|
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/** |
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* A runnable calling lockInterruptibly |
25 |
*/ |
26 |
class InterruptibleLockRunnable extends CheckedRunnable { |
27 |
final ReentrantLock lock; |
28 |
InterruptibleLockRunnable(ReentrantLock l) { lock = l; } |
29 |
public void realRun() throws InterruptedException { |
30 |
lock.lockInterruptibly(); |
31 |
} |
32 |
} |
33 |
|
34 |
|
35 |
/** |
36 |
* A runnable calling lockInterruptibly that expects to be |
37 |
* interrupted |
38 |
*/ |
39 |
class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
40 |
final ReentrantLock lock; |
41 |
InterruptedLockRunnable(ReentrantLock l) { lock = l; } |
42 |
public void realRun() throws InterruptedException { |
43 |
lock.lockInterruptibly(); |
44 |
} |
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} |
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|
47 |
/** |
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* Subclass to expose protected methods |
49 |
*/ |
50 |
static class PublicReentrantLock extends ReentrantLock { |
51 |
PublicReentrantLock() { super(); } |
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public Collection<Thread> getQueuedThreads() { |
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return super.getQueuedThreads(); |
54 |
} |
55 |
public Collection<Thread> getWaitingThreads(Condition c) { |
56 |
return super.getWaitingThreads(c); |
57 |
} |
58 |
|
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|
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} |
61 |
|
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/** |
63 |
* Constructor sets given fairness |
64 |
*/ |
65 |
public void testConstructor() { |
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assertFalse(new ReentrantLock().isFair()); |
67 |
assertFalse(new ReentrantLock(false).isFair()); |
68 |
assertTrue(new ReentrantLock(true).isFair()); |
69 |
} |
70 |
|
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/** |
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* locking an unlocked lock succeeds |
73 |
*/ |
74 |
public void testLock() { |
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ReentrantLock rl = new ReentrantLock(); |
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rl.lock(); |
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assertTrue(rl.isLocked()); |
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rl.unlock(); |
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assertFalse(rl.isLocked()); |
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} |
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|
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/** |
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* locking an unlocked fair lock succeeds |
84 |
*/ |
85 |
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(); |
90 |
} |
91 |
|
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/** |
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* Unlocking an unlocked lock throws IllegalMonitorStateException |
94 |
*/ |
95 |
public void testUnlock_IllegalMonitorStateException() { |
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ReentrantLock rl = new ReentrantLock(); |
97 |
try { |
98 |
rl.unlock(); |
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shouldThrow(); |
100 |
} catch (IllegalMonitorStateException success) {} |
101 |
} |
102 |
|
103 |
/** |
104 |
* tryLock on an unlocked lock succeeds |
105 |
*/ |
106 |
public void testTryLock() { |
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ReentrantLock rl = new ReentrantLock(); |
108 |
assertTrue(rl.tryLock()); |
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assertTrue(rl.isLocked()); |
110 |
rl.unlock(); |
111 |
} |
112 |
|
113 |
|
114 |
/** |
115 |
* hasQueuedThreads reports whether there are waiting threads |
116 |
*/ |
117 |
public void testhasQueuedThreads() throws InterruptedException { |
118 |
final ReentrantLock lock = new ReentrantLock(); |
119 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
120 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
121 |
assertFalse(lock.hasQueuedThreads()); |
122 |
lock.lock(); |
123 |
t1.start(); |
124 |
Thread.sleep(SHORT_DELAY_MS); |
125 |
assertTrue(lock.hasQueuedThreads()); |
126 |
t2.start(); |
127 |
Thread.sleep(SHORT_DELAY_MS); |
128 |
assertTrue(lock.hasQueuedThreads()); |
129 |
t1.interrupt(); |
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Thread.sleep(SHORT_DELAY_MS); |
131 |
assertTrue(lock.hasQueuedThreads()); |
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lock.unlock(); |
133 |
Thread.sleep(SHORT_DELAY_MS); |
134 |
assertFalse(lock.hasQueuedThreads()); |
135 |
t1.join(); |
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t2.join(); |
137 |
} |
138 |
|
139 |
/** |
140 |
* getQueueLength reports number of waiting threads |
141 |
*/ |
142 |
public void testGetQueueLength() throws InterruptedException { |
143 |
final ReentrantLock lock = new ReentrantLock(); |
144 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
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Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
146 |
assertEquals(0, lock.getQueueLength()); |
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lock.lock(); |
148 |
t1.start(); |
149 |
Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(1, lock.getQueueLength()); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(2, lock.getQueueLength()); |
154 |
t1.interrupt(); |
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Thread.sleep(SHORT_DELAY_MS); |
156 |
assertEquals(1, lock.getQueueLength()); |
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lock.unlock(); |
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Thread.sleep(SHORT_DELAY_MS); |
159 |
assertEquals(0, lock.getQueueLength()); |
160 |
t1.join(); |
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t2.join(); |
162 |
} |
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|
164 |
/** |
165 |
* getQueueLength reports number of waiting threads |
166 |
*/ |
167 |
public void testGetQueueLength_fair() throws InterruptedException { |
168 |
final ReentrantLock lock = new ReentrantLock(true); |
169 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
170 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
171 |
assertEquals(0, lock.getQueueLength()); |
172 |
lock.lock(); |
173 |
t1.start(); |
174 |
Thread.sleep(SHORT_DELAY_MS); |
175 |
assertEquals(1, lock.getQueueLength()); |
176 |
t2.start(); |
177 |
Thread.sleep(SHORT_DELAY_MS); |
178 |
assertEquals(2, lock.getQueueLength()); |
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t1.interrupt(); |
180 |
Thread.sleep(SHORT_DELAY_MS); |
181 |
assertEquals(1, lock.getQueueLength()); |
182 |
lock.unlock(); |
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Thread.sleep(SHORT_DELAY_MS); |
184 |
assertEquals(0, lock.getQueueLength()); |
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t1.join(); |
186 |
t2.join(); |
187 |
} |
188 |
|
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/** |
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* hasQueuedThread(null) throws NPE |
191 |
*/ |
192 |
public void testHasQueuedThreadNPE() { |
193 |
final ReentrantLock sync = new ReentrantLock(); |
194 |
try { |
195 |
sync.hasQueuedThread(null); |
196 |
shouldThrow(); |
197 |
} catch (NullPointerException success) {} |
198 |
} |
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|
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/** |
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* hasQueuedThread reports whether a thread is queued. |
202 |
*/ |
203 |
public void testHasQueuedThread() throws InterruptedException { |
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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)); |
207 |
assertFalse(sync.hasQueuedThread(t1)); |
208 |
assertFalse(sync.hasQueuedThread(t2)); |
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sync.lock(); |
210 |
t1.start(); |
211 |
Thread.sleep(SHORT_DELAY_MS); |
212 |
assertTrue(sync.hasQueuedThread(t1)); |
213 |
t2.start(); |
214 |
Thread.sleep(SHORT_DELAY_MS); |
215 |
assertTrue(sync.hasQueuedThread(t1)); |
216 |
assertTrue(sync.hasQueuedThread(t2)); |
217 |
t1.interrupt(); |
218 |
Thread.sleep(SHORT_DELAY_MS); |
219 |
assertFalse(sync.hasQueuedThread(t1)); |
220 |
assertTrue(sync.hasQueuedThread(t2)); |
221 |
sync.unlock(); |
222 |
Thread.sleep(SHORT_DELAY_MS); |
223 |
assertFalse(sync.hasQueuedThread(t1)); |
224 |
Thread.sleep(SHORT_DELAY_MS); |
225 |
assertFalse(sync.hasQueuedThread(t2)); |
226 |
t1.join(); |
227 |
t2.join(); |
228 |
} |
229 |
|
230 |
|
231 |
/** |
232 |
* getQueuedThreads includes waiting threads |
233 |
*/ |
234 |
public void testGetQueuedThreads() throws InterruptedException { |
235 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
236 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
237 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
238 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
239 |
lock.lock(); |
240 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
241 |
t1.start(); |
242 |
Thread.sleep(SHORT_DELAY_MS); |
243 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
244 |
t2.start(); |
245 |
Thread.sleep(SHORT_DELAY_MS); |
246 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
247 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
248 |
t1.interrupt(); |
249 |
Thread.sleep(SHORT_DELAY_MS); |
250 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
251 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
252 |
lock.unlock(); |
253 |
Thread.sleep(SHORT_DELAY_MS); |
254 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
255 |
t1.join(); |
256 |
t2.join(); |
257 |
} |
258 |
|
259 |
|
260 |
/** |
261 |
* timed tryLock is interruptible. |
262 |
*/ |
263 |
public void testInterruptedException2() throws InterruptedException { |
264 |
final ReentrantLock lock = new ReentrantLock(); |
265 |
lock.lock(); |
266 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
267 |
public void realRun() throws InterruptedException { |
268 |
lock.tryLock(MEDIUM_DELAY_MS,TimeUnit.MILLISECONDS); |
269 |
}}); |
270 |
|
271 |
t.start(); |
272 |
t.interrupt(); |
273 |
t.join(); |
274 |
} |
275 |
|
276 |
|
277 |
/** |
278 |
* TryLock on a locked lock fails |
279 |
*/ |
280 |
public void testTryLockWhenLocked() throws InterruptedException { |
281 |
final ReentrantLock lock = new ReentrantLock(); |
282 |
lock.lock(); |
283 |
Thread t = new Thread(new CheckedRunnable() { |
284 |
public void realRun() { |
285 |
threadAssertFalse(lock.tryLock()); |
286 |
}}); |
287 |
|
288 |
t.start(); |
289 |
t.join(); |
290 |
lock.unlock(); |
291 |
} |
292 |
|
293 |
/** |
294 |
* Timed tryLock on a locked lock times out |
295 |
*/ |
296 |
public void testTryLock_Timeout() throws InterruptedException { |
297 |
final ReentrantLock lock = new ReentrantLock(); |
298 |
lock.lock(); |
299 |
Thread t = new Thread(new CheckedRunnable() { |
300 |
public void realRun() throws InterruptedException { |
301 |
threadAssertFalse(lock.tryLock(1, TimeUnit.MILLISECONDS)); |
302 |
}}); |
303 |
|
304 |
t.start(); |
305 |
t.join(); |
306 |
lock.unlock(); |
307 |
} |
308 |
|
309 |
/** |
310 |
* getHoldCount returns number of recursive holds |
311 |
*/ |
312 |
public void testGetHoldCount() { |
313 |
ReentrantLock lock = new ReentrantLock(); |
314 |
for (int i = 1; i <= SIZE; i++) { |
315 |
lock.lock(); |
316 |
assertEquals(i, lock.getHoldCount()); |
317 |
} |
318 |
for (int i = SIZE; i > 0; i--) { |
319 |
lock.unlock(); |
320 |
assertEquals(i-1, lock.getHoldCount()); |
321 |
} |
322 |
} |
323 |
|
324 |
|
325 |
/** |
326 |
* isLocked is true when locked and false when not |
327 |
*/ |
328 |
public void testIsLocked() throws InterruptedException { |
329 |
final ReentrantLock lock = new ReentrantLock(); |
330 |
lock.lock(); |
331 |
assertTrue(lock.isLocked()); |
332 |
lock.unlock(); |
333 |
assertFalse(lock.isLocked()); |
334 |
Thread t = new Thread(new CheckedRunnable() { |
335 |
public void realRun() throws InterruptedException { |
336 |
lock.lock(); |
337 |
Thread.sleep(SMALL_DELAY_MS); |
338 |
lock.unlock(); |
339 |
}}); |
340 |
|
341 |
t.start(); |
342 |
Thread.sleep(SHORT_DELAY_MS); |
343 |
assertTrue(lock.isLocked()); |
344 |
t.join(); |
345 |
assertFalse(lock.isLocked()); |
346 |
} |
347 |
|
348 |
|
349 |
/** |
350 |
* lockInterruptibly is interruptible. |
351 |
*/ |
352 |
public void testLockInterruptibly1() throws InterruptedException { |
353 |
final ReentrantLock lock = new ReentrantLock(); |
354 |
lock.lock(); |
355 |
Thread t = new Thread(new InterruptedLockRunnable(lock)); |
356 |
t.start(); |
357 |
Thread.sleep(SHORT_DELAY_MS); |
358 |
t.interrupt(); |
359 |
Thread.sleep(SHORT_DELAY_MS); |
360 |
lock.unlock(); |
361 |
t.join(); |
362 |
} |
363 |
|
364 |
/** |
365 |
* lockInterruptibly succeeds when unlocked, else is interruptible |
366 |
*/ |
367 |
public void testLockInterruptibly2() throws InterruptedException { |
368 |
final ReentrantLock lock = new ReentrantLock(); |
369 |
lock.lockInterruptibly(); |
370 |
Thread t = new Thread(new InterruptedLockRunnable(lock)); |
371 |
t.start(); |
372 |
t.interrupt(); |
373 |
assertTrue(lock.isLocked()); |
374 |
assertTrue(lock.isHeldByCurrentThread()); |
375 |
t.join(); |
376 |
} |
377 |
|
378 |
/** |
379 |
* Calling await without holding lock throws IllegalMonitorStateException |
380 |
*/ |
381 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
382 |
final ReentrantLock lock = new ReentrantLock(); |
383 |
final Condition c = lock.newCondition(); |
384 |
try { |
385 |
c.await(); |
386 |
shouldThrow(); |
387 |
} catch (IllegalMonitorStateException success) {} |
388 |
} |
389 |
|
390 |
/** |
391 |
* Calling signal without holding lock throws IllegalMonitorStateException |
392 |
*/ |
393 |
public void testSignal_IllegalMonitor() { |
394 |
final ReentrantLock lock = new ReentrantLock(); |
395 |
final Condition c = lock.newCondition(); |
396 |
try { |
397 |
c.signal(); |
398 |
shouldThrow(); |
399 |
} catch (IllegalMonitorStateException success) {} |
400 |
} |
401 |
|
402 |
/** |
403 |
* awaitNanos without a signal times out |
404 |
*/ |
405 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
406 |
final ReentrantLock lock = new ReentrantLock(); |
407 |
final Condition c = lock.newCondition(); |
408 |
lock.lock(); |
409 |
long t = c.awaitNanos(100); |
410 |
assertTrue(t <= 0); |
411 |
lock.unlock(); |
412 |
} |
413 |
|
414 |
/** |
415 |
* timed await without a signal times out |
416 |
*/ |
417 |
public void testAwait_Timeout() throws InterruptedException { |
418 |
final ReentrantLock lock = new ReentrantLock(); |
419 |
final Condition c = lock.newCondition(); |
420 |
lock.lock(); |
421 |
assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
422 |
lock.unlock(); |
423 |
} |
424 |
|
425 |
/** |
426 |
* awaitUntil without a signal times out |
427 |
*/ |
428 |
public void testAwaitUntil_Timeout() throws InterruptedException { |
429 |
final ReentrantLock lock = new ReentrantLock(); |
430 |
final Condition c = lock.newCondition(); |
431 |
lock.lock(); |
432 |
java.util.Date d = new java.util.Date(); |
433 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
434 |
lock.unlock(); |
435 |
} |
436 |
|
437 |
/** |
438 |
* await returns when signalled |
439 |
*/ |
440 |
public void testAwait() throws InterruptedException { |
441 |
final ReentrantLock lock = new ReentrantLock(); |
442 |
final Condition c = lock.newCondition(); |
443 |
Thread t = new Thread(new CheckedRunnable() { |
444 |
public void realRun() throws InterruptedException { |
445 |
lock.lock(); |
446 |
c.await(); |
447 |
lock.unlock(); |
448 |
}}); |
449 |
|
450 |
t.start(); |
451 |
Thread.sleep(SHORT_DELAY_MS); |
452 |
lock.lock(); |
453 |
c.signal(); |
454 |
lock.unlock(); |
455 |
t.join(SHORT_DELAY_MS); |
456 |
assertFalse(t.isAlive()); |
457 |
} |
458 |
|
459 |
/** |
460 |
* hasWaiters throws NPE if null |
461 |
*/ |
462 |
public void testHasWaitersNPE() { |
463 |
final ReentrantLock lock = new ReentrantLock(); |
464 |
try { |
465 |
lock.hasWaiters(null); |
466 |
shouldThrow(); |
467 |
} catch (NullPointerException success) {} |
468 |
} |
469 |
|
470 |
/** |
471 |
* getWaitQueueLength throws NPE if null |
472 |
*/ |
473 |
public void testGetWaitQueueLengthNPE() { |
474 |
final ReentrantLock lock = new ReentrantLock(); |
475 |
try { |
476 |
lock.getWaitQueueLength(null); |
477 |
shouldThrow(); |
478 |
} catch (NullPointerException success) {} |
479 |
} |
480 |
|
481 |
|
482 |
/** |
483 |
* getWaitingThreads throws NPE if null |
484 |
*/ |
485 |
public void testGetWaitingThreadsNPE() { |
486 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
487 |
try { |
488 |
lock.getWaitingThreads(null); |
489 |
shouldThrow(); |
490 |
} catch (NullPointerException success) {} |
491 |
} |
492 |
|
493 |
|
494 |
/** |
495 |
* hasWaiters throws IAE if not owned |
496 |
*/ |
497 |
public void testHasWaitersIAE() { |
498 |
final ReentrantLock lock = new ReentrantLock(); |
499 |
final Condition c = lock.newCondition(); |
500 |
final ReentrantLock lock2 = new ReentrantLock(); |
501 |
try { |
502 |
lock2.hasWaiters(c); |
503 |
shouldThrow(); |
504 |
} catch (IllegalArgumentException success) {} |
505 |
} |
506 |
|
507 |
/** |
508 |
* hasWaiters throws IMSE if not locked |
509 |
*/ |
510 |
public void testHasWaitersIMSE() { |
511 |
final ReentrantLock lock = new ReentrantLock(); |
512 |
final Condition c = lock.newCondition(); |
513 |
try { |
514 |
lock.hasWaiters(c); |
515 |
shouldThrow(); |
516 |
} catch (IllegalMonitorStateException success) {} |
517 |
} |
518 |
|
519 |
|
520 |
/** |
521 |
* getWaitQueueLength throws IAE if not owned |
522 |
*/ |
523 |
public void testGetWaitQueueLengthIAE() { |
524 |
final ReentrantLock lock = new ReentrantLock(); |
525 |
final Condition c = lock.newCondition(); |
526 |
final ReentrantLock lock2 = new ReentrantLock(); |
527 |
try { |
528 |
lock2.getWaitQueueLength(c); |
529 |
shouldThrow(); |
530 |
} catch (IllegalArgumentException success) {} |
531 |
} |
532 |
|
533 |
/** |
534 |
* getWaitQueueLength throws IMSE if not locked |
535 |
*/ |
536 |
public void testGetWaitQueueLengthIMSE() { |
537 |
final ReentrantLock lock = new ReentrantLock(); |
538 |
final Condition c = lock.newCondition(); |
539 |
try { |
540 |
lock.getWaitQueueLength(c); |
541 |
shouldThrow(); |
542 |
} catch (IllegalMonitorStateException success) {} |
543 |
} |
544 |
|
545 |
|
546 |
/** |
547 |
* getWaitingThreads throws IAE if not owned |
548 |
*/ |
549 |
public void testGetWaitingThreadsIAE() { |
550 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
551 |
final Condition c = lock.newCondition(); |
552 |
final PublicReentrantLock lock2 = new PublicReentrantLock(); |
553 |
try { |
554 |
lock2.getWaitingThreads(c); |
555 |
shouldThrow(); |
556 |
} catch (IllegalArgumentException success) {} |
557 |
} |
558 |
|
559 |
/** |
560 |
* getWaitingThreads throws IMSE if not locked |
561 |
*/ |
562 |
public void testGetWaitingThreadsIMSE() { |
563 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
564 |
final Condition c = lock.newCondition(); |
565 |
try { |
566 |
lock.getWaitingThreads(c); |
567 |
shouldThrow(); |
568 |
} catch (IllegalMonitorStateException success) {} |
569 |
} |
570 |
|
571 |
|
572 |
/** |
573 |
* hasWaiters returns true when a thread is waiting, else false |
574 |
*/ |
575 |
public void testHasWaiters() throws InterruptedException { |
576 |
final ReentrantLock lock = new ReentrantLock(); |
577 |
final Condition c = lock.newCondition(); |
578 |
Thread t = new Thread(new CheckedRunnable() { |
579 |
public void realRun() throws InterruptedException { |
580 |
lock.lock(); |
581 |
threadAssertFalse(lock.hasWaiters(c)); |
582 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
583 |
c.await(); |
584 |
lock.unlock(); |
585 |
}}); |
586 |
|
587 |
t.start(); |
588 |
Thread.sleep(SHORT_DELAY_MS); |
589 |
lock.lock(); |
590 |
assertTrue(lock.hasWaiters(c)); |
591 |
assertEquals(1, lock.getWaitQueueLength(c)); |
592 |
c.signal(); |
593 |
lock.unlock(); |
594 |
Thread.sleep(SHORT_DELAY_MS); |
595 |
lock.lock(); |
596 |
assertFalse(lock.hasWaiters(c)); |
597 |
assertEquals(0, lock.getWaitQueueLength(c)); |
598 |
lock.unlock(); |
599 |
t.join(SHORT_DELAY_MS); |
600 |
assertFalse(t.isAlive()); |
601 |
} |
602 |
|
603 |
/** |
604 |
* getWaitQueueLength returns number of waiting threads |
605 |
*/ |
606 |
public void testGetWaitQueueLength() throws InterruptedException { |
607 |
final ReentrantLock lock = new ReentrantLock(); |
608 |
final Condition c = lock.newCondition(); |
609 |
Thread t1 = new Thread(new CheckedRunnable() { |
610 |
public void realRun() throws InterruptedException { |
611 |
lock.lock(); |
612 |
threadAssertFalse(lock.hasWaiters(c)); |
613 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
614 |
c.await(); |
615 |
lock.unlock(); |
616 |
}}); |
617 |
|
618 |
Thread t2 = new Thread(new CheckedRunnable() { |
619 |
public void realRun() throws InterruptedException { |
620 |
lock.lock(); |
621 |
threadAssertTrue(lock.hasWaiters(c)); |
622 |
threadAssertEquals(1, lock.getWaitQueueLength(c)); |
623 |
c.await(); |
624 |
lock.unlock(); |
625 |
}}); |
626 |
|
627 |
t1.start(); |
628 |
Thread.sleep(SHORT_DELAY_MS); |
629 |
t2.start(); |
630 |
Thread.sleep(SHORT_DELAY_MS); |
631 |
lock.lock(); |
632 |
assertTrue(lock.hasWaiters(c)); |
633 |
assertEquals(2, lock.getWaitQueueLength(c)); |
634 |
c.signalAll(); |
635 |
lock.unlock(); |
636 |
Thread.sleep(SHORT_DELAY_MS); |
637 |
lock.lock(); |
638 |
assertFalse(lock.hasWaiters(c)); |
639 |
assertEquals(0, lock.getWaitQueueLength(c)); |
640 |
lock.unlock(); |
641 |
t1.join(SHORT_DELAY_MS); |
642 |
t2.join(SHORT_DELAY_MS); |
643 |
assertFalse(t1.isAlive()); |
644 |
assertFalse(t2.isAlive()); |
645 |
} |
646 |
|
647 |
/** |
648 |
* getWaitingThreads returns only and all waiting threads |
649 |
*/ |
650 |
public void testGetWaitingThreads() throws InterruptedException { |
651 |
final PublicReentrantLock lock = new PublicReentrantLock(); |
652 |
final Condition c = lock.newCondition(); |
653 |
Thread t1 = new Thread(new CheckedRunnable() { |
654 |
public void realRun() throws InterruptedException { |
655 |
lock.lock(); |
656 |
threadAssertTrue(lock.getWaitingThreads(c).isEmpty()); |
657 |
c.await(); |
658 |
lock.unlock(); |
659 |
}}); |
660 |
|
661 |
Thread t2 = new Thread(new CheckedRunnable() { |
662 |
public void realRun() throws InterruptedException { |
663 |
lock.lock(); |
664 |
threadAssertFalse(lock.getWaitingThreads(c).isEmpty()); |
665 |
c.await(); |
666 |
lock.unlock(); |
667 |
}}); |
668 |
|
669 |
lock.lock(); |
670 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
671 |
lock.unlock(); |
672 |
t1.start(); |
673 |
Thread.sleep(SHORT_DELAY_MS); |
674 |
t2.start(); |
675 |
Thread.sleep(SHORT_DELAY_MS); |
676 |
lock.lock(); |
677 |
assertTrue(lock.hasWaiters(c)); |
678 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
679 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
680 |
c.signalAll(); |
681 |
lock.unlock(); |
682 |
Thread.sleep(SHORT_DELAY_MS); |
683 |
lock.lock(); |
684 |
assertFalse(lock.hasWaiters(c)); |
685 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
686 |
lock.unlock(); |
687 |
t1.join(SHORT_DELAY_MS); |
688 |
t2.join(SHORT_DELAY_MS); |
689 |
assertFalse(t1.isAlive()); |
690 |
assertFalse(t2.isAlive()); |
691 |
} |
692 |
|
693 |
/** A helper class for uninterruptible wait tests */ |
694 |
class UninterruptibleThread extends Thread { |
695 |
private ReentrantLock lock; |
696 |
private Condition c; |
697 |
|
698 |
public volatile boolean canAwake = false; |
699 |
public volatile boolean interrupted = false; |
700 |
public volatile boolean lockStarted = false; |
701 |
|
702 |
public UninterruptibleThread(ReentrantLock lock, Condition c) { |
703 |
this.lock = lock; |
704 |
this.c = c; |
705 |
} |
706 |
|
707 |
public synchronized void run() { |
708 |
lock.lock(); |
709 |
lockStarted = true; |
710 |
|
711 |
while (!canAwake) { |
712 |
c.awaitUninterruptibly(); |
713 |
} |
714 |
|
715 |
interrupted = isInterrupted(); |
716 |
lock.unlock(); |
717 |
} |
718 |
} |
719 |
|
720 |
/** |
721 |
* awaitUninterruptibly doesn't abort on interrupt |
722 |
*/ |
723 |
public void testAwaitUninterruptibly() throws InterruptedException { |
724 |
final ReentrantLock lock = new ReentrantLock(); |
725 |
final Condition c = lock.newCondition(); |
726 |
UninterruptibleThread thread = new UninterruptibleThread(lock, c); |
727 |
|
728 |
thread.start(); |
729 |
|
730 |
while (!thread.lockStarted) { |
731 |
Thread.sleep(100); |
732 |
} |
733 |
|
734 |
lock.lock(); |
735 |
try { |
736 |
thread.interrupt(); |
737 |
thread.canAwake = true; |
738 |
c.signal(); |
739 |
} finally { |
740 |
lock.unlock(); |
741 |
} |
742 |
|
743 |
thread.join(); |
744 |
assertTrue(thread.interrupted); |
745 |
assertFalse(thread.isAlive()); |
746 |
} |
747 |
|
748 |
/** |
749 |
* await is interruptible |
750 |
*/ |
751 |
public void testAwait_Interrupt() throws InterruptedException { |
752 |
final ReentrantLock lock = new ReentrantLock(); |
753 |
final Condition c = lock.newCondition(); |
754 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
755 |
public void realRun() throws InterruptedException { |
756 |
lock.lock(); |
757 |
c.await(); |
758 |
}}); |
759 |
|
760 |
t.start(); |
761 |
Thread.sleep(SHORT_DELAY_MS); |
762 |
t.interrupt(); |
763 |
t.join(SHORT_DELAY_MS); |
764 |
assertFalse(t.isAlive()); |
765 |
} |
766 |
|
767 |
/** |
768 |
* awaitNanos is interruptible |
769 |
*/ |
770 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
771 |
final ReentrantLock lock = new ReentrantLock(); |
772 |
final Condition c = lock.newCondition(); |
773 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
774 |
public void realRun() throws InterruptedException { |
775 |
lock.lock(); |
776 |
c.awaitNanos(1000 * 1000 * 1000); // 1 sec |
777 |
}}); |
778 |
|
779 |
t.start(); |
780 |
Thread.sleep(SHORT_DELAY_MS); |
781 |
t.interrupt(); |
782 |
t.join(SHORT_DELAY_MS); |
783 |
assertFalse(t.isAlive()); |
784 |
} |
785 |
|
786 |
/** |
787 |
* awaitUntil is interruptible |
788 |
*/ |
789 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
790 |
final ReentrantLock lock = new ReentrantLock(); |
791 |
final Condition c = lock.newCondition(); |
792 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
793 |
public void realRun() throws InterruptedException { |
794 |
lock.lock(); |
795 |
java.util.Date d = new java.util.Date(); |
796 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
797 |
}}); |
798 |
|
799 |
t.start(); |
800 |
Thread.sleep(SHORT_DELAY_MS); |
801 |
t.interrupt(); |
802 |
t.join(SHORT_DELAY_MS); |
803 |
assertFalse(t.isAlive()); |
804 |
} |
805 |
|
806 |
/** |
807 |
* signalAll wakes up all threads |
808 |
*/ |
809 |
public void testSignalAll() throws InterruptedException { |
810 |
final ReentrantLock lock = new ReentrantLock(); |
811 |
final Condition c = lock.newCondition(); |
812 |
Thread t1 = new Thread(new CheckedRunnable() { |
813 |
public void realRun() throws InterruptedException { |
814 |
lock.lock(); |
815 |
c.await(); |
816 |
lock.unlock(); |
817 |
}}); |
818 |
|
819 |
Thread t2 = new Thread(new CheckedRunnable() { |
820 |
public void realRun() throws InterruptedException { |
821 |
lock.lock(); |
822 |
c.await(); |
823 |
lock.unlock(); |
824 |
}}); |
825 |
|
826 |
t1.start(); |
827 |
t2.start(); |
828 |
Thread.sleep(SHORT_DELAY_MS); |
829 |
lock.lock(); |
830 |
c.signalAll(); |
831 |
lock.unlock(); |
832 |
t1.join(SHORT_DELAY_MS); |
833 |
t2.join(SHORT_DELAY_MS); |
834 |
assertFalse(t1.isAlive()); |
835 |
assertFalse(t2.isAlive()); |
836 |
} |
837 |
|
838 |
/** |
839 |
* await after multiple reentrant locking preserves lock count |
840 |
*/ |
841 |
public void testAwaitLockCount() throws InterruptedException { |
842 |
final ReentrantLock lock = new ReentrantLock(); |
843 |
final Condition c = lock.newCondition(); |
844 |
Thread t1 = new Thread(new CheckedRunnable() { |
845 |
public void realRun() throws InterruptedException { |
846 |
lock.lock(); |
847 |
threadAssertEquals(1, lock.getHoldCount()); |
848 |
c.await(); |
849 |
threadAssertEquals(1, lock.getHoldCount()); |
850 |
lock.unlock(); |
851 |
}}); |
852 |
|
853 |
Thread t2 = new Thread(new CheckedRunnable() { |
854 |
public void realRun() throws InterruptedException { |
855 |
lock.lock(); |
856 |
lock.lock(); |
857 |
threadAssertEquals(2, lock.getHoldCount()); |
858 |
c.await(); |
859 |
threadAssertEquals(2, lock.getHoldCount()); |
860 |
lock.unlock(); |
861 |
lock.unlock(); |
862 |
}}); |
863 |
|
864 |
t1.start(); |
865 |
t2.start(); |
866 |
Thread.sleep(SHORT_DELAY_MS); |
867 |
lock.lock(); |
868 |
c.signalAll(); |
869 |
lock.unlock(); |
870 |
t1.join(SHORT_DELAY_MS); |
871 |
t2.join(SHORT_DELAY_MS); |
872 |
assertFalse(t1.isAlive()); |
873 |
assertFalse(t2.isAlive()); |
874 |
} |
875 |
|
876 |
/** |
877 |
* A serialized lock deserializes as unlocked |
878 |
*/ |
879 |
public void testSerialization() throws Exception { |
880 |
ReentrantLock l = new ReentrantLock(); |
881 |
l.lock(); |
882 |
l.unlock(); |
883 |
|
884 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
885 |
ObjectOutputStream out = |
886 |
new ObjectOutputStream(new BufferedOutputStream(bout)); |
887 |
out.writeObject(l); |
888 |
out.close(); |
889 |
|
890 |
ByteArrayInputStream bin = |
891 |
new ByteArrayInputStream(bout.toByteArray()); |
892 |
ObjectInputStream in = |
893 |
new ObjectInputStream(new BufferedInputStream(bin)); |
894 |
ReentrantLock r = (ReentrantLock) in.readObject(); |
895 |
r.lock(); |
896 |
r.unlock(); |
897 |
} |
898 |
|
899 |
/** |
900 |
* toString indicates current lock state |
901 |
*/ |
902 |
public void testToString() { |
903 |
ReentrantLock lock = new ReentrantLock(); |
904 |
String us = lock.toString(); |
905 |
assertTrue(us.indexOf("Unlocked") >= 0); |
906 |
lock.lock(); |
907 |
String ls = lock.toString(); |
908 |
assertTrue(ls.indexOf("Locked") >= 0); |
909 |
} |
910 |
|
911 |
} |