1 |
/* |
2 |
* Written by Doug Lea and Martin Buchholz |
3 |
* with assistance from members of JCP JSR-166 Expert Group and |
4 |
* released to the public domain, as explained at |
5 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
6 |
*/ |
7 |
|
8 |
import static java.util.concurrent.TimeUnit.DAYS; |
9 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
10 |
import static java.util.concurrent.TimeUnit.SECONDS; |
11 |
|
12 |
import java.util.ArrayList; |
13 |
import java.util.List; |
14 |
import java.util.concurrent.CountDownLatch; |
15 |
import java.util.concurrent.Future; |
16 |
import java.util.concurrent.TimeUnit; |
17 |
import java.util.concurrent.locks.Lock; |
18 |
import java.util.concurrent.locks.StampedLock; |
19 |
import java.util.function.BiConsumer; |
20 |
import java.util.function.Consumer; |
21 |
import java.util.function.Function; |
22 |
|
23 |
import junit.framework.Test; |
24 |
import junit.framework.TestSuite; |
25 |
|
26 |
public class StampedLockTest extends JSR166TestCase { |
27 |
public static void main(String[] args) { |
28 |
main(suite(), args); |
29 |
} |
30 |
public static Test suite() { |
31 |
return new TestSuite(StampedLockTest.class); |
32 |
} |
33 |
|
34 |
/** |
35 |
* Releases write lock, checking isWriteLocked before and after |
36 |
*/ |
37 |
void releaseWriteLock(StampedLock lock, long stamp) { |
38 |
assertTrue(lock.isWriteLocked()); |
39 |
assertValid(lock, stamp); |
40 |
lock.unlockWrite(stamp); |
41 |
assertFalse(lock.isWriteLocked()); |
42 |
assertFalse(lock.validate(stamp)); |
43 |
} |
44 |
|
45 |
/** |
46 |
* Releases read lock, checking isReadLocked before and after |
47 |
*/ |
48 |
void releaseReadLock(StampedLock lock, long stamp) { |
49 |
assertTrue(lock.isReadLocked()); |
50 |
assertValid(lock, stamp); |
51 |
lock.unlockRead(stamp); |
52 |
assertFalse(lock.isReadLocked()); |
53 |
assertTrue(lock.validate(stamp)); |
54 |
} |
55 |
|
56 |
long assertNonZero(long v) { |
57 |
assertTrue(v != 0L); |
58 |
return v; |
59 |
} |
60 |
|
61 |
long assertValid(StampedLock lock, long stamp) { |
62 |
assertTrue(stamp != 0L); |
63 |
assertTrue(lock.validate(stamp)); |
64 |
return stamp; |
65 |
} |
66 |
|
67 |
void assertUnlocked(StampedLock lock) { |
68 |
assertFalse(lock.isReadLocked()); |
69 |
assertFalse(lock.isWriteLocked()); |
70 |
assertEquals(0, lock.getReadLockCount()); |
71 |
assertValid(lock, lock.tryOptimisticRead()); |
72 |
} |
73 |
|
74 |
List<Action> lockLockers(Lock lock) { |
75 |
List<Action> lockers = new ArrayList<>(); |
76 |
lockers.add(() -> lock.lock()); |
77 |
lockers.add(() -> lock.lockInterruptibly()); |
78 |
lockers.add(() -> lock.tryLock()); |
79 |
lockers.add(() -> lock.tryLock(Long.MIN_VALUE, DAYS)); |
80 |
lockers.add(() -> lock.tryLock(0L, DAYS)); |
81 |
lockers.add(() -> lock.tryLock(Long.MAX_VALUE, DAYS)); |
82 |
return lockers; |
83 |
} |
84 |
|
85 |
List<Function<StampedLock, Long>> readLockers() { |
86 |
List<Function<StampedLock, Long>> readLockers = new ArrayList<>(); |
87 |
readLockers.add((sl) -> sl.readLock()); |
88 |
readLockers.add((sl) -> sl.tryReadLock()); |
89 |
readLockers.add((sl) -> readLockInterruptiblyUninterrupted(sl)); |
90 |
readLockers.add((sl) -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS)); |
91 |
readLockers.add((sl) -> tryReadLockUninterrupted(sl, 0L, DAYS)); |
92 |
readLockers.add((sl) -> sl.tryConvertToReadLock(sl.tryOptimisticRead())); |
93 |
return readLockers; |
94 |
} |
95 |
|
96 |
List<BiConsumer<StampedLock, Long>> readUnlockers() { |
97 |
List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>(); |
98 |
readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp)); |
99 |
readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead())); |
100 |
readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock()); |
101 |
readUnlockers.add((sl, stamp) -> sl.unlock(stamp)); |
102 |
readUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
103 |
return readUnlockers; |
104 |
} |
105 |
|
106 |
List<Function<StampedLock, Long>> writeLockers() { |
107 |
List<Function<StampedLock, Long>> writeLockers = new ArrayList<>(); |
108 |
writeLockers.add((sl) -> sl.writeLock()); |
109 |
writeLockers.add((sl) -> sl.tryWriteLock()); |
110 |
writeLockers.add((sl) -> writeLockInterruptiblyUninterrupted(sl)); |
111 |
writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS)); |
112 |
writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, 0L, DAYS)); |
113 |
writeLockers.add((sl) -> sl.tryConvertToWriteLock(sl.tryOptimisticRead())); |
114 |
return writeLockers; |
115 |
} |
116 |
|
117 |
List<BiConsumer<StampedLock, Long>> writeUnlockers() { |
118 |
List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>(); |
119 |
writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp)); |
120 |
writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite())); |
121 |
writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock()); |
122 |
writeUnlockers.add((sl, stamp) -> sl.unlock(stamp)); |
123 |
writeUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
124 |
return writeUnlockers; |
125 |
} |
126 |
|
127 |
/** |
128 |
* Constructed StampedLock is in unlocked state |
129 |
*/ |
130 |
public void testConstructor() { |
131 |
assertUnlocked(new StampedLock()); |
132 |
} |
133 |
|
134 |
/** |
135 |
* write-locking, then unlocking, an unlocked lock succeed |
136 |
*/ |
137 |
public void testWriteLock_lockUnlock() { |
138 |
StampedLock lock = new StampedLock(); |
139 |
|
140 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
141 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
142 |
assertFalse(lock.isWriteLocked()); |
143 |
assertFalse(lock.isReadLocked()); |
144 |
assertEquals(0, lock.getReadLockCount()); |
145 |
|
146 |
long s = writeLocker.apply(lock); |
147 |
assertValid(lock, s); |
148 |
assertTrue(lock.isWriteLocked()); |
149 |
assertFalse(lock.isReadLocked()); |
150 |
assertEquals(0, lock.getReadLockCount()); |
151 |
writeUnlocker.accept(lock, s); |
152 |
assertUnlocked(lock); |
153 |
} |
154 |
} |
155 |
|
156 |
/** |
157 |
* read-locking, then unlocking, an unlocked lock succeed |
158 |
*/ |
159 |
public void testReadLock_lockUnlock() { |
160 |
StampedLock lock = new StampedLock(); |
161 |
|
162 |
for (Function<StampedLock, Long> readLocker : readLockers()) |
163 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
164 |
long s = 42; |
165 |
for (int i = 0; i < 2; i++) { |
166 |
s = assertValid(lock, readLocker.apply(lock)); |
167 |
assertFalse(lock.isWriteLocked()); |
168 |
assertTrue(lock.isReadLocked()); |
169 |
assertEquals(i + 1, lock.getReadLockCount()); |
170 |
} |
171 |
for (int i = 0; i < 2; i++) { |
172 |
assertFalse(lock.isWriteLocked()); |
173 |
assertTrue(lock.isReadLocked()); |
174 |
assertEquals(2 - i, lock.getReadLockCount()); |
175 |
readUnlocker.accept(lock, s); |
176 |
} |
177 |
assertUnlocked(lock); |
178 |
} |
179 |
} |
180 |
|
181 |
/** |
182 |
* tryUnlockWrite fails if not write locked |
183 |
*/ |
184 |
public void testTryUnlockWrite_failure() { |
185 |
StampedLock lock = new StampedLock(); |
186 |
assertFalse(lock.tryUnlockWrite()); |
187 |
|
188 |
for (Function<StampedLock, Long> readLocker : readLockers()) |
189 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
190 |
long s = assertValid(lock, readLocker.apply(lock)); |
191 |
assertFalse(lock.tryUnlockWrite()); |
192 |
assertTrue(lock.isReadLocked()); |
193 |
readUnlocker.accept(lock, s); |
194 |
assertUnlocked(lock); |
195 |
} |
196 |
} |
197 |
|
198 |
/** |
199 |
* tryUnlockRead fails if not read locked |
200 |
*/ |
201 |
public void testTryUnlockRead_failure() { |
202 |
StampedLock lock = new StampedLock(); |
203 |
assertFalse(lock.tryUnlockRead()); |
204 |
|
205 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
206 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
207 |
long s = writeLocker.apply(lock); |
208 |
assertFalse(lock.tryUnlockRead()); |
209 |
assertTrue(lock.isWriteLocked()); |
210 |
writeUnlocker.accept(lock, s); |
211 |
assertUnlocked(lock); |
212 |
} |
213 |
} |
214 |
|
215 |
/** |
216 |
* validate(0L) fails |
217 |
*/ |
218 |
public void testValidate0() { |
219 |
StampedLock lock = new StampedLock(); |
220 |
assertFalse(lock.validate(0L)); |
221 |
} |
222 |
|
223 |
/** |
224 |
* A stamp obtained from a successful lock operation validates while the lock is held |
225 |
*/ |
226 |
public void testValidate() throws InterruptedException { |
227 |
StampedLock lock = new StampedLock(); |
228 |
|
229 |
for (Function<StampedLock, Long> readLocker : readLockers()) |
230 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
231 |
long s = assertNonZero(readLocker.apply(lock)); |
232 |
assertTrue(lock.validate(s)); |
233 |
readUnlocker.accept(lock, s); |
234 |
} |
235 |
|
236 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
237 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
238 |
long s = assertNonZero(writeLocker.apply(lock)); |
239 |
assertTrue(lock.validate(s)); |
240 |
writeUnlocker.accept(lock, s); |
241 |
} |
242 |
} |
243 |
|
244 |
/** |
245 |
* A stamp obtained from an unsuccessful lock operation does not validate |
246 |
*/ |
247 |
public void testValidate2() throws InterruptedException { |
248 |
StampedLock lock = new StampedLock(); |
249 |
long s = assertNonZero(lock.writeLock()); |
250 |
assertTrue(lock.validate(s)); |
251 |
assertFalse(lock.validate(lock.tryWriteLock())); |
252 |
assertFalse(lock.validate(lock.tryWriteLock(0L, SECONDS))); |
253 |
assertFalse(lock.validate(lock.tryReadLock())); |
254 |
assertFalse(lock.validate(lock.tryReadLock(0L, SECONDS))); |
255 |
assertFalse(lock.validate(lock.tryOptimisticRead())); |
256 |
lock.unlockWrite(s); |
257 |
} |
258 |
|
259 |
void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) { |
260 |
for (Action action : actions) { |
261 |
Thread.currentThread().interrupt(); |
262 |
try { |
263 |
action.run(); |
264 |
shouldThrow(); |
265 |
} |
266 |
catch (InterruptedException success) {} |
267 |
catch (Throwable fail) { threadUnexpectedException(fail); } |
268 |
assertFalse(Thread.interrupted()); |
269 |
} |
270 |
} |
271 |
|
272 |
/** |
273 |
* interruptible operations throw InterruptedException when pre-interrupted |
274 |
*/ |
275 |
public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() { |
276 |
final CountDownLatch running = new CountDownLatch(1); |
277 |
final StampedLock lock = new StampedLock(); |
278 |
|
279 |
Action[] interruptibleLockActions = { |
280 |
() -> lock.writeLockInterruptibly(), |
281 |
() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS), |
282 |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
283 |
() -> lock.readLockInterruptibly(), |
284 |
() -> lock.tryReadLock(Long.MIN_VALUE, DAYS), |
285 |
() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
286 |
() -> lock.asWriteLock().lockInterruptibly(), |
287 |
() -> lock.asWriteLock().tryLock(0L, DAYS), |
288 |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
289 |
() -> lock.asReadLock().lockInterruptibly(), |
290 |
() -> lock.asReadLock().tryLock(0L, DAYS), |
291 |
() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
292 |
}; |
293 |
shuffle(interruptibleLockActions); |
294 |
|
295 |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
296 |
{ |
297 |
long s = lock.writeLock(); |
298 |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
299 |
lock.unlockWrite(s); |
300 |
} |
301 |
{ |
302 |
long s = lock.readLock(); |
303 |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
304 |
lock.unlockRead(s); |
305 |
} |
306 |
} |
307 |
|
308 |
void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) { |
309 |
int n = actions.length; |
310 |
Future<?>[] futures = new Future<?>[n]; |
311 |
CountDownLatch threadsStarted = new CountDownLatch(n); |
312 |
CountDownLatch done = new CountDownLatch(n); |
313 |
|
314 |
for (int i = 0; i < n; i++) { |
315 |
Action action = actions[i]; |
316 |
futures[i] = cachedThreadPool.submit(new CheckedRunnable() { |
317 |
public void realRun() throws Throwable { |
318 |
threadsStarted.countDown(); |
319 |
try { |
320 |
action.run(); |
321 |
shouldThrow(); |
322 |
} |
323 |
catch (InterruptedException success) {} |
324 |
catch (Throwable fail) { threadUnexpectedException(fail); } |
325 |
assertFalse(Thread.interrupted()); |
326 |
done.countDown(); |
327 |
}}); |
328 |
} |
329 |
|
330 |
await(threadsStarted); |
331 |
assertEquals(n, done.getCount()); |
332 |
for (Future<?> future : futures) // Interrupt all the tasks |
333 |
future.cancel(true); |
334 |
await(done); |
335 |
} |
336 |
|
337 |
/** |
338 |
* interruptible operations throw InterruptedException when write locked and interrupted |
339 |
*/ |
340 |
public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() { |
341 |
final CountDownLatch running = new CountDownLatch(1); |
342 |
final StampedLock lock = new StampedLock(); |
343 |
long s = lock.writeLock(); |
344 |
|
345 |
Action[] interruptibleLockBlockingActions = { |
346 |
() -> lock.writeLockInterruptibly(), |
347 |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
348 |
() -> lock.readLockInterruptibly(), |
349 |
() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
350 |
() -> lock.asWriteLock().lockInterruptibly(), |
351 |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
352 |
() -> lock.asReadLock().lockInterruptibly(), |
353 |
() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
354 |
}; |
355 |
shuffle(interruptibleLockBlockingActions); |
356 |
|
357 |
assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
358 |
} |
359 |
|
360 |
/** |
361 |
* interruptible operations throw InterruptedException when read locked and interrupted |
362 |
*/ |
363 |
public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() { |
364 |
final CountDownLatch running = new CountDownLatch(1); |
365 |
final StampedLock lock = new StampedLock(); |
366 |
long s = lock.readLock(); |
367 |
|
368 |
Action[] interruptibleLockBlockingActions = { |
369 |
() -> lock.writeLockInterruptibly(), |
370 |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
371 |
() -> lock.asWriteLock().lockInterruptibly(), |
372 |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
373 |
}; |
374 |
shuffle(interruptibleLockBlockingActions); |
375 |
|
376 |
assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
377 |
} |
378 |
|
379 |
/** |
380 |
* Non-interruptible operations ignore and preserve interrupt status |
381 |
*/ |
382 |
public void testNonInterruptibleOperationsIgnoreInterrupts() { |
383 |
final StampedLock lock = new StampedLock(); |
384 |
Thread.currentThread().interrupt(); |
385 |
|
386 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
387 |
long s = assertValid(lock, lock.readLock()); |
388 |
readUnlocker.accept(lock, s); |
389 |
s = assertValid(lock, lock.tryReadLock()); |
390 |
readUnlocker.accept(lock, s); |
391 |
} |
392 |
|
393 |
lock.asReadLock().lock(); |
394 |
lock.asReadLock().unlock(); |
395 |
|
396 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
397 |
long s = assertValid(lock, lock.writeLock()); |
398 |
writeUnlocker.accept(lock, s); |
399 |
s = assertValid(lock, lock.tryWriteLock()); |
400 |
writeUnlocker.accept(lock, s); |
401 |
} |
402 |
|
403 |
lock.asWriteLock().lock(); |
404 |
lock.asWriteLock().unlock(); |
405 |
|
406 |
assertTrue(Thread.interrupted()); |
407 |
} |
408 |
|
409 |
/** |
410 |
* tryWriteLock on an unlocked lock succeeds |
411 |
*/ |
412 |
public void testTryWriteLock() { |
413 |
final StampedLock lock = new StampedLock(); |
414 |
long s = lock.tryWriteLock(); |
415 |
assertTrue(s != 0L); |
416 |
assertTrue(lock.isWriteLocked()); |
417 |
assertEquals(0L, lock.tryWriteLock()); |
418 |
releaseWriteLock(lock, s); |
419 |
} |
420 |
|
421 |
/** |
422 |
* tryWriteLock fails if locked |
423 |
*/ |
424 |
public void testTryWriteLockWhenLocked() { |
425 |
final StampedLock lock = new StampedLock(); |
426 |
long s = lock.writeLock(); |
427 |
Thread t = newStartedThread(new CheckedRunnable() { |
428 |
public void realRun() { |
429 |
assertEquals(0L, lock.tryWriteLock()); |
430 |
}}); |
431 |
|
432 |
assertEquals(0L, lock.tryWriteLock()); |
433 |
awaitTermination(t); |
434 |
releaseWriteLock(lock, s); |
435 |
} |
436 |
|
437 |
/** |
438 |
* tryReadLock fails if write-locked |
439 |
*/ |
440 |
public void testTryReadLockWhenLocked() { |
441 |
final StampedLock lock = new StampedLock(); |
442 |
long s = lock.writeLock(); |
443 |
Thread t = newStartedThread(new CheckedRunnable() { |
444 |
public void realRun() { |
445 |
assertEquals(0L, lock.tryReadLock()); |
446 |
}}); |
447 |
|
448 |
assertEquals(0L, lock.tryReadLock()); |
449 |
awaitTermination(t); |
450 |
releaseWriteLock(lock, s); |
451 |
} |
452 |
|
453 |
/** |
454 |
* Multiple threads can hold a read lock when not write-locked |
455 |
*/ |
456 |
public void testMultipleReadLocks() { |
457 |
final StampedLock lock = new StampedLock(); |
458 |
final long s = lock.readLock(); |
459 |
Thread t = newStartedThread(new CheckedRunnable() { |
460 |
public void realRun() throws InterruptedException { |
461 |
long s2 = lock.tryReadLock(); |
462 |
assertValid(lock, s2); |
463 |
lock.unlockRead(s2); |
464 |
long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS); |
465 |
assertValid(lock, s3); |
466 |
lock.unlockRead(s3); |
467 |
long s4 = lock.readLock(); |
468 |
assertValid(lock, s4); |
469 |
lock.unlockRead(s4); |
470 |
lock.asReadLock().lock(); |
471 |
lock.asReadLock().unlock(); |
472 |
lock.asReadLock().lockInterruptibly(); |
473 |
lock.asReadLock().unlock(); |
474 |
lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS); |
475 |
lock.asReadLock().unlock(); |
476 |
}}); |
477 |
|
478 |
awaitTermination(t); |
479 |
lock.unlockRead(s); |
480 |
} |
481 |
|
482 |
/** |
483 |
* A writelock succeeds only after a reading thread unlocks |
484 |
*/ |
485 |
public void testWriteAfterReadLock() throws InterruptedException { |
486 |
final CountDownLatch running = new CountDownLatch(1); |
487 |
final StampedLock lock = new StampedLock(); |
488 |
long rs = lock.readLock(); |
489 |
Thread t = newStartedThread(new CheckedRunnable() { |
490 |
public void realRun() { |
491 |
running.countDown(); |
492 |
long s = lock.writeLock(); |
493 |
lock.unlockWrite(s); |
494 |
}}); |
495 |
|
496 |
running.await(); |
497 |
waitForThreadToEnterWaitState(t, MEDIUM_DELAY_MS); |
498 |
assertFalse(lock.isWriteLocked()); |
499 |
lock.unlockRead(rs); |
500 |
awaitTermination(t); |
501 |
assertFalse(lock.isWriteLocked()); |
502 |
} |
503 |
|
504 |
/** |
505 |
* A writelock succeeds only after reading threads unlock |
506 |
*/ |
507 |
public void testWriteAfterMultipleReadLocks() { |
508 |
final StampedLock lock = new StampedLock(); |
509 |
long s = lock.readLock(); |
510 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
511 |
public void realRun() { |
512 |
long rs = lock.readLock(); |
513 |
lock.unlockRead(rs); |
514 |
}}); |
515 |
|
516 |
awaitTermination(t1); |
517 |
|
518 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
519 |
public void realRun() { |
520 |
long ws = lock.writeLock(); |
521 |
lock.unlockWrite(ws); |
522 |
}}); |
523 |
|
524 |
assertTrue(lock.isReadLocked()); |
525 |
assertFalse(lock.isWriteLocked()); |
526 |
lock.unlockRead(s); |
527 |
awaitTermination(t2); |
528 |
assertFalse(lock.isWriteLocked()); |
529 |
} |
530 |
|
531 |
/** |
532 |
* Readlocks succeed only after a writing thread unlocks |
533 |
*/ |
534 |
public void testReadAfterWriteLock() { |
535 |
final StampedLock lock = new StampedLock(); |
536 |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
537 |
final long s = lock.writeLock(); |
538 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
539 |
public void realRun() { |
540 |
threadsStarted.countDown(); |
541 |
long rs = lock.readLock(); |
542 |
lock.unlockRead(rs); |
543 |
}}); |
544 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
545 |
public void realRun() { |
546 |
threadsStarted.countDown(); |
547 |
long rs = lock.readLock(); |
548 |
lock.unlockRead(rs); |
549 |
}}); |
550 |
|
551 |
await(threadsStarted); |
552 |
waitForThreadToEnterWaitState(t1, MEDIUM_DELAY_MS); |
553 |
waitForThreadToEnterWaitState(t2, MEDIUM_DELAY_MS); |
554 |
releaseWriteLock(lock, s); |
555 |
awaitTermination(t1); |
556 |
awaitTermination(t2); |
557 |
} |
558 |
|
559 |
/** |
560 |
* tryReadLock succeeds if read locked but not write locked |
561 |
*/ |
562 |
public void testTryLockWhenReadLocked() { |
563 |
final StampedLock lock = new StampedLock(); |
564 |
long s = lock.readLock(); |
565 |
Thread t = newStartedThread(new CheckedRunnable() { |
566 |
public void realRun() { |
567 |
long rs = lock.tryReadLock(); |
568 |
assertValid(lock, rs); |
569 |
lock.unlockRead(rs); |
570 |
}}); |
571 |
|
572 |
awaitTermination(t); |
573 |
lock.unlockRead(s); |
574 |
} |
575 |
|
576 |
/** |
577 |
* tryWriteLock fails when read locked |
578 |
*/ |
579 |
public void testTryWriteLockWhenReadLocked() { |
580 |
final StampedLock lock = new StampedLock(); |
581 |
long s = lock.readLock(); |
582 |
Thread t = newStartedThread(new CheckedRunnable() { |
583 |
public void realRun() { |
584 |
threadAssertEquals(0L, lock.tryWriteLock()); |
585 |
}}); |
586 |
|
587 |
awaitTermination(t); |
588 |
lock.unlockRead(s); |
589 |
} |
590 |
|
591 |
/** |
592 |
* timed lock operations time out if lock not available |
593 |
*/ |
594 |
public void testTimedLock_Timeout() throws Exception { |
595 |
ArrayList<Future<?>> futures = new ArrayList<>(); |
596 |
|
597 |
// Write locked |
598 |
final StampedLock lock = new StampedLock(); |
599 |
long stamp = lock.writeLock(); |
600 |
assertEquals(0L, lock.tryReadLock(0L, DAYS)); |
601 |
assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS)); |
602 |
assertFalse(lock.asReadLock().tryLock(0L, DAYS)); |
603 |
assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS)); |
604 |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
605 |
assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS)); |
606 |
assertFalse(lock.asWriteLock().tryLock(0L, DAYS)); |
607 |
assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
608 |
|
609 |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
610 |
public void realRun() throws InterruptedException { |
611 |
long startTime = System.nanoTime(); |
612 |
assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
613 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
614 |
}})); |
615 |
|
616 |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
617 |
public void realRun() throws InterruptedException { |
618 |
long startTime = System.nanoTime(); |
619 |
assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS)); |
620 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
621 |
}})); |
622 |
|
623 |
// Read locked |
624 |
final StampedLock lock2 = new StampedLock(); |
625 |
long stamp2 = lock2.readLock(); |
626 |
assertEquals(0L, lock2.tryWriteLock(0L, DAYS)); |
627 |
assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS)); |
628 |
assertFalse(lock2.asWriteLock().tryLock(0L, DAYS)); |
629 |
assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
630 |
|
631 |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
632 |
public void realRun() throws InterruptedException { |
633 |
long startTime = System.nanoTime(); |
634 |
assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
635 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
636 |
}})); |
637 |
|
638 |
for (Future<?> future : futures) |
639 |
assertNull(future.get()); |
640 |
|
641 |
releaseWriteLock(lock, stamp); |
642 |
releaseReadLock(lock2, stamp2); |
643 |
} |
644 |
|
645 |
/** |
646 |
* writeLockInterruptibly succeeds if unlocked |
647 |
*/ |
648 |
public void testWriteLockInterruptibly() throws InterruptedException { |
649 |
final StampedLock lock = new StampedLock(); |
650 |
long s = lock.writeLockInterruptibly(); |
651 |
assertTrue(lock.isWriteLocked()); |
652 |
releaseWriteLock(lock, s); |
653 |
} |
654 |
|
655 |
/** |
656 |
* readLockInterruptibly succeeds if lock free |
657 |
*/ |
658 |
public void testReadLockInterruptibly() throws InterruptedException { |
659 |
final StampedLock lock = new StampedLock(); |
660 |
|
661 |
long s = assertValid(lock, lock.readLockInterruptibly()); |
662 |
assertTrue(lock.isReadLocked()); |
663 |
lock.unlockRead(s); |
664 |
|
665 |
lock.asReadLock().lockInterruptibly(); |
666 |
assertTrue(lock.isReadLocked()); |
667 |
lock.asReadLock().unlock(); |
668 |
} |
669 |
|
670 |
/** |
671 |
* A serialized lock deserializes as unlocked |
672 |
*/ |
673 |
public void testSerialization() { |
674 |
StampedLock lock = new StampedLock(); |
675 |
lock.writeLock(); |
676 |
StampedLock clone = serialClone(lock); |
677 |
assertTrue(lock.isWriteLocked()); |
678 |
assertFalse(clone.isWriteLocked()); |
679 |
long s = clone.writeLock(); |
680 |
assertTrue(clone.isWriteLocked()); |
681 |
clone.unlockWrite(s); |
682 |
assertFalse(clone.isWriteLocked()); |
683 |
} |
684 |
|
685 |
/** |
686 |
* toString indicates current lock state |
687 |
*/ |
688 |
public void testToString() { |
689 |
StampedLock lock = new StampedLock(); |
690 |
assertTrue(lock.toString().contains("Unlocked")); |
691 |
long s = lock.writeLock(); |
692 |
assertTrue(lock.toString().contains("Write-locked")); |
693 |
lock.unlockWrite(s); |
694 |
s = lock.readLock(); |
695 |
assertTrue(lock.toString().contains("Read-locks")); |
696 |
} |
697 |
|
698 |
/** |
699 |
* tryOptimisticRead succeeds and validates if unlocked, fails if |
700 |
* exclusively locked |
701 |
*/ |
702 |
public void testValidateOptimistic() throws InterruptedException { |
703 |
StampedLock lock = new StampedLock(); |
704 |
|
705 |
assertValid(lock, lock.tryOptimisticRead()); |
706 |
|
707 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
708 |
long s = assertValid(lock, writeLocker.apply(lock)); |
709 |
assertEquals(0L, lock.tryOptimisticRead()); |
710 |
releaseWriteLock(lock, s); |
711 |
} |
712 |
|
713 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
714 |
long s = assertValid(lock, readLocker.apply(lock)); |
715 |
long p = assertValid(lock, lock.tryOptimisticRead()); |
716 |
releaseReadLock(lock, s); |
717 |
assertTrue(lock.validate(p)); |
718 |
} |
719 |
|
720 |
assertValid(lock, lock.tryOptimisticRead()); |
721 |
} |
722 |
|
723 |
/** |
724 |
* tryOptimisticRead stamp does not validate if a write lock intervenes |
725 |
*/ |
726 |
public void testValidateOptimisticWriteLocked() { |
727 |
final StampedLock lock = new StampedLock(); |
728 |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
729 |
final long s = assertValid(lock, lock.writeLock()); |
730 |
assertFalse(lock.validate(p)); |
731 |
assertEquals(0L, lock.tryOptimisticRead()); |
732 |
assertTrue(lock.validate(s)); |
733 |
lock.unlockWrite(s); |
734 |
} |
735 |
|
736 |
/** |
737 |
* tryOptimisticRead stamp does not validate if a write lock |
738 |
* intervenes in another thread |
739 |
*/ |
740 |
public void testValidateOptimisticWriteLocked2() |
741 |
throws InterruptedException { |
742 |
final CountDownLatch running = new CountDownLatch(1); |
743 |
final StampedLock lock = new StampedLock(); |
744 |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
745 |
|
746 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
747 |
public void realRun() throws InterruptedException { |
748 |
lock.writeLockInterruptibly(); |
749 |
running.countDown(); |
750 |
lock.writeLockInterruptibly(); |
751 |
}}); |
752 |
|
753 |
running.await(); |
754 |
assertFalse(lock.validate(p)); |
755 |
assertEquals(0L, lock.tryOptimisticRead()); |
756 |
t.interrupt(); |
757 |
awaitTermination(t); |
758 |
} |
759 |
|
760 |
/** |
761 |
* tryConvertToOptimisticRead succeeds and validates if successfully locked |
762 |
*/ |
763 |
public void testTryConvertToOptimisticRead() throws InterruptedException { |
764 |
StampedLock lock = new StampedLock(); |
765 |
long s, p, q; |
766 |
assertEquals(0L, lock.tryConvertToOptimisticRead(0L)); |
767 |
|
768 |
s = assertValid(lock, lock.tryOptimisticRead()); |
769 |
assertEquals(s, lock.tryConvertToOptimisticRead(s)); |
770 |
assertTrue(lock.validate(s)); |
771 |
|
772 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
773 |
s = assertValid(lock, writeLocker.apply(lock)); |
774 |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
775 |
assertFalse(lock.validate(s)); |
776 |
assertTrue(lock.validate(p)); |
777 |
assertUnlocked(lock); |
778 |
} |
779 |
|
780 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
781 |
s = assertValid(lock, readLocker.apply(lock)); |
782 |
q = assertValid(lock, lock.tryOptimisticRead()); |
783 |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
784 |
assertTrue(lock.validate(q)); |
785 |
assertTrue(lock.isReadLocked()); |
786 |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
787 |
assertTrue(lock.validate(p)); |
788 |
assertTrue(lock.validate(s)); |
789 |
assertUnlocked(lock); |
790 |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
791 |
assertTrue(lock.validate(q)); |
792 |
} |
793 |
} |
794 |
|
795 |
/** |
796 |
* tryConvertToReadLock succeeds for valid stamps |
797 |
*/ |
798 |
public void testTryConvertToReadLock() throws InterruptedException { |
799 |
StampedLock lock = new StampedLock(); |
800 |
long s, p; |
801 |
|
802 |
assertEquals(0L, lock.tryConvertToReadLock(0L)); |
803 |
|
804 |
s = assertValid(lock, lock.tryOptimisticRead()); |
805 |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
806 |
assertTrue(lock.isReadLocked()); |
807 |
assertEquals(1, lock.getReadLockCount()); |
808 |
assertTrue(lock.validate(s)); |
809 |
lock.unlockRead(p); |
810 |
|
811 |
s = assertValid(lock, lock.tryOptimisticRead()); |
812 |
lock.readLock(); |
813 |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
814 |
assertTrue(lock.isReadLocked()); |
815 |
assertEquals(2, lock.getReadLockCount()); |
816 |
lock.unlockRead(p); |
817 |
lock.unlockRead(p); |
818 |
assertUnlocked(lock); |
819 |
|
820 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
821 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
822 |
s = assertValid(lock, writeLocker.apply(lock)); |
823 |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
824 |
assertFalse(lock.validate(s)); |
825 |
assertTrue(lock.isReadLocked()); |
826 |
assertEquals(1, lock.getReadLockCount()); |
827 |
readUnlocker.accept(lock, p); |
828 |
} |
829 |
|
830 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
831 |
s = assertValid(lock, readLocker.apply(lock)); |
832 |
assertEquals(s, lock.tryConvertToReadLock(s)); |
833 |
assertTrue(lock.validate(s)); |
834 |
assertTrue(lock.isReadLocked()); |
835 |
assertEquals(1, lock.getReadLockCount()); |
836 |
readUnlocker.accept(lock, s); |
837 |
} |
838 |
} |
839 |
} |
840 |
|
841 |
/** |
842 |
* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked |
843 |
*/ |
844 |
public void testTryConvertToWriteLock() throws InterruptedException { |
845 |
StampedLock lock = new StampedLock(); |
846 |
long s, p; |
847 |
|
848 |
assertEquals(0L, lock.tryConvertToWriteLock(0L)); |
849 |
|
850 |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
851 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
852 |
assertTrue(lock.isWriteLocked()); |
853 |
lock.unlockWrite(p); |
854 |
|
855 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
856 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
857 |
s = assertValid(lock, writeLocker.apply(lock)); |
858 |
assertEquals(s, lock.tryConvertToWriteLock(s)); |
859 |
assertTrue(lock.validate(s)); |
860 |
assertTrue(lock.isWriteLocked()); |
861 |
writeUnlocker.accept(lock, s); |
862 |
} |
863 |
|
864 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
865 |
s = assertValid(lock, readLocker.apply(lock)); |
866 |
p = assertValid(lock, lock.tryConvertToWriteLock(s)); |
867 |
assertFalse(lock.validate(s)); |
868 |
assertTrue(lock.validate(p)); |
869 |
assertTrue(lock.isWriteLocked()); |
870 |
writeUnlocker.accept(lock, p); |
871 |
} |
872 |
} |
873 |
|
874 |
// failure if multiply read locked |
875 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
876 |
s = assertValid(lock, readLocker.apply(lock)); |
877 |
p = assertValid(lock, readLocker.apply(lock)); |
878 |
assertEquals(0L, lock.tryConvertToWriteLock(s)); |
879 |
assertTrue(lock.validate(s)); |
880 |
assertTrue(lock.validate(p)); |
881 |
assertEquals(2, lock.getReadLockCount()); |
882 |
lock.unlock(p); |
883 |
lock.unlock(s); |
884 |
assertUnlocked(lock); |
885 |
} |
886 |
} |
887 |
|
888 |
/** |
889 |
* asWriteLock can be locked and unlocked |
890 |
*/ |
891 |
public void testAsWriteLock() throws Throwable { |
892 |
StampedLock sl = new StampedLock(); |
893 |
Lock lock = sl.asWriteLock(); |
894 |
for (Action locker : lockLockers(lock)) { |
895 |
locker.run(); |
896 |
assertTrue(sl.isWriteLocked()); |
897 |
assertFalse(sl.isReadLocked()); |
898 |
assertFalse(lock.tryLock()); |
899 |
lock.unlock(); |
900 |
assertUnlocked(sl); |
901 |
} |
902 |
} |
903 |
|
904 |
/** |
905 |
* asReadLock can be locked and unlocked |
906 |
*/ |
907 |
public void testAsReadLock() throws Throwable { |
908 |
StampedLock sl = new StampedLock(); |
909 |
Lock lock = sl.asReadLock(); |
910 |
for (Action locker : lockLockers(lock)) { |
911 |
locker.run(); |
912 |
assertTrue(sl.isReadLocked()); |
913 |
assertFalse(sl.isWriteLocked()); |
914 |
assertEquals(1, sl.getReadLockCount()); |
915 |
locker.run(); |
916 |
assertTrue(sl.isReadLocked()); |
917 |
assertEquals(2, sl.getReadLockCount()); |
918 |
lock.unlock(); |
919 |
lock.unlock(); |
920 |
assertUnlocked(sl); |
921 |
} |
922 |
} |
923 |
|
924 |
/** |
925 |
* asReadWriteLock.writeLock can be locked and unlocked |
926 |
*/ |
927 |
public void testAsReadWriteLockWriteLock() throws Throwable { |
928 |
StampedLock sl = new StampedLock(); |
929 |
Lock lock = sl.asReadWriteLock().writeLock(); |
930 |
for (Action locker : lockLockers(lock)) { |
931 |
locker.run(); |
932 |
assertTrue(sl.isWriteLocked()); |
933 |
assertFalse(sl.isReadLocked()); |
934 |
assertFalse(lock.tryLock()); |
935 |
lock.unlock(); |
936 |
assertUnlocked(sl); |
937 |
} |
938 |
} |
939 |
|
940 |
/** |
941 |
* asReadWriteLock.readLock can be locked and unlocked |
942 |
*/ |
943 |
public void testAsReadWriteLockReadLock() throws Throwable { |
944 |
StampedLock sl = new StampedLock(); |
945 |
Lock lock = sl.asReadWriteLock().readLock(); |
946 |
for (Action locker : lockLockers(lock)) { |
947 |
locker.run(); |
948 |
assertTrue(sl.isReadLocked()); |
949 |
assertFalse(sl.isWriteLocked()); |
950 |
assertEquals(1, sl.getReadLockCount()); |
951 |
locker.run(); |
952 |
assertTrue(sl.isReadLocked()); |
953 |
assertEquals(2, sl.getReadLockCount()); |
954 |
lock.unlock(); |
955 |
lock.unlock(); |
956 |
assertUnlocked(sl); |
957 |
} |
958 |
} |
959 |
|
960 |
/** |
961 |
* Lock.newCondition throws UnsupportedOperationException |
962 |
*/ |
963 |
public void testLockViewsDoNotSupportConditions() { |
964 |
StampedLock sl = new StampedLock(); |
965 |
assertThrows(UnsupportedOperationException.class, |
966 |
() -> sl.asWriteLock().newCondition(), |
967 |
() -> sl.asReadLock().newCondition(), |
968 |
() -> sl.asReadWriteLock().writeLock().newCondition(), |
969 |
() -> sl.asReadWriteLock().readLock().newCondition()); |
970 |
} |
971 |
|
972 |
/** |
973 |
* Passing optimistic read stamps to unlock operations result in |
974 |
* IllegalMonitorStateException |
975 |
*/ |
976 |
public void testCannotUnlockOptimisticReadStamps() { |
977 |
Runnable[] actions = { |
978 |
() -> { |
979 |
StampedLock sl = new StampedLock(); |
980 |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
981 |
sl.unlockRead(stamp); |
982 |
}, |
983 |
() -> { |
984 |
StampedLock sl = new StampedLock(); |
985 |
long stamp = sl.tryOptimisticRead(); |
986 |
sl.unlock(stamp); |
987 |
}, |
988 |
|
989 |
() -> { |
990 |
StampedLock sl = new StampedLock(); |
991 |
long stamp = sl.tryOptimisticRead(); |
992 |
sl.writeLock(); |
993 |
sl.unlock(stamp); |
994 |
}, |
995 |
() -> { |
996 |
StampedLock sl = new StampedLock(); |
997 |
sl.readLock(); |
998 |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
999 |
sl.unlockRead(stamp); |
1000 |
}, |
1001 |
() -> { |
1002 |
StampedLock sl = new StampedLock(); |
1003 |
sl.readLock(); |
1004 |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
1005 |
sl.unlock(stamp); |
1006 |
}, |
1007 |
|
1008 |
() -> { |
1009 |
StampedLock sl = new StampedLock(); |
1010 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1011 |
assertValid(sl, stamp); |
1012 |
sl.writeLock(); |
1013 |
sl.unlockWrite(stamp); |
1014 |
}, |
1015 |
() -> { |
1016 |
StampedLock sl = new StampedLock(); |
1017 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1018 |
sl.writeLock(); |
1019 |
sl.unlock(stamp); |
1020 |
}, |
1021 |
() -> { |
1022 |
StampedLock sl = new StampedLock(); |
1023 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1024 |
sl.readLock(); |
1025 |
sl.unlockRead(stamp); |
1026 |
}, |
1027 |
() -> { |
1028 |
StampedLock sl = new StampedLock(); |
1029 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1030 |
sl.readLock(); |
1031 |
sl.unlock(stamp); |
1032 |
}, |
1033 |
|
1034 |
() -> { |
1035 |
StampedLock sl = new StampedLock(); |
1036 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1037 |
assertValid(sl, stamp); |
1038 |
sl.writeLock(); |
1039 |
sl.unlockWrite(stamp); |
1040 |
}, |
1041 |
() -> { |
1042 |
StampedLock sl = new StampedLock(); |
1043 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1044 |
sl.writeLock(); |
1045 |
sl.unlock(stamp); |
1046 |
}, |
1047 |
() -> { |
1048 |
StampedLock sl = new StampedLock(); |
1049 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1050 |
sl.readLock(); |
1051 |
sl.unlockRead(stamp); |
1052 |
}, |
1053 |
() -> { |
1054 |
StampedLock sl = new StampedLock(); |
1055 |
sl.readLock(); |
1056 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1057 |
assertValid(sl, stamp); |
1058 |
sl.readLock(); |
1059 |
sl.unlockRead(stamp); |
1060 |
}, |
1061 |
() -> { |
1062 |
StampedLock sl = new StampedLock(); |
1063 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1064 |
sl.readLock(); |
1065 |
sl.unlock(stamp); |
1066 |
}, |
1067 |
() -> { |
1068 |
StampedLock sl = new StampedLock(); |
1069 |
sl.readLock(); |
1070 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1071 |
sl.readLock(); |
1072 |
sl.unlock(stamp); |
1073 |
}, |
1074 |
}; |
1075 |
|
1076 |
assertThrows(IllegalMonitorStateException.class, actions); |
1077 |
} |
1078 |
|
1079 |
static long writeLockInterruptiblyUninterrupted(StampedLock sl) { |
1080 |
try { return sl.writeLockInterruptibly(); } |
1081 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1082 |
} |
1083 |
|
1084 |
static long tryWriteLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1085 |
try { return sl.tryWriteLock(time, unit); } |
1086 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1087 |
} |
1088 |
|
1089 |
static long readLockInterruptiblyUninterrupted(StampedLock sl) { |
1090 |
try { return sl.readLockInterruptibly(); } |
1091 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1092 |
} |
1093 |
|
1094 |
static long tryReadLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1095 |
try { return sl.tryReadLock(time, unit); } |
1096 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1097 |
} |
1098 |
|
1099 |
/** |
1100 |
* Invalid stamps result in IllegalMonitorStateException |
1101 |
*/ |
1102 |
public void testInvalidStampsThrowIllegalMonitorStateException() { |
1103 |
final StampedLock sl = new StampedLock(); |
1104 |
|
1105 |
assertThrows(IllegalMonitorStateException.class, |
1106 |
() -> sl.unlockWrite(0L), |
1107 |
() -> sl.unlockRead(0L), |
1108 |
() -> sl.unlock(0L)); |
1109 |
|
1110 |
final long optimisticStamp = sl.tryOptimisticRead(); |
1111 |
final long readStamp = sl.readLock(); |
1112 |
sl.unlockRead(readStamp); |
1113 |
final long writeStamp = sl.writeLock(); |
1114 |
sl.unlockWrite(writeStamp); |
1115 |
assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L); |
1116 |
final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp }; |
1117 |
final Runnable assertNoLongerValidStampsThrow = () -> { |
1118 |
for (long noLongerValidStamp : noLongerValidStamps) |
1119 |
assertThrows(IllegalMonitorStateException.class, |
1120 |
() -> sl.unlockWrite(noLongerValidStamp), |
1121 |
() -> sl.unlockRead(noLongerValidStamp), |
1122 |
() -> sl.unlock(noLongerValidStamp)); |
1123 |
}; |
1124 |
assertNoLongerValidStampsThrow.run(); |
1125 |
|
1126 |
for (Function<StampedLock, Long> readLocker : readLockers()) |
1127 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
1128 |
final long stamp = readLocker.apply(sl); |
1129 |
assertValid(sl, stamp); |
1130 |
assertNoLongerValidStampsThrow.run(); |
1131 |
assertThrows(IllegalMonitorStateException.class, |
1132 |
() -> sl.unlockWrite(stamp), |
1133 |
() -> sl.unlockRead(sl.tryOptimisticRead()), |
1134 |
() -> sl.unlockRead(0L)); |
1135 |
readUnlocker.accept(sl, stamp); |
1136 |
assertUnlocked(sl); |
1137 |
assertNoLongerValidStampsThrow.run(); |
1138 |
} |
1139 |
|
1140 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
1141 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
1142 |
final long stamp = writeLocker.apply(sl); |
1143 |
assertValid(sl, stamp); |
1144 |
assertNoLongerValidStampsThrow.run(); |
1145 |
assertThrows(IllegalMonitorStateException.class, |
1146 |
() -> sl.unlockRead(stamp), |
1147 |
() -> sl.unlockWrite(0L)); |
1148 |
writeUnlocker.accept(sl, stamp); |
1149 |
assertUnlocked(sl); |
1150 |
assertNoLongerValidStampsThrow.run(); |
1151 |
} |
1152 |
} |
1153 |
|
1154 |
/** |
1155 |
* Read locks can be very deeply nested |
1156 |
*/ |
1157 |
public void testDeeplyNestedReadLocks() { |
1158 |
final StampedLock lock = new StampedLock(); |
1159 |
final int depth = 300; |
1160 |
final long[] stamps = new long[depth]; |
1161 |
final List<Function<StampedLock, Long>> readLockers = readLockers(); |
1162 |
final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers(); |
1163 |
for (int i = 0; i < depth; i++) { |
1164 |
Function<StampedLock, Long> readLocker |
1165 |
= readLockers.get(i % readLockers.size()); |
1166 |
long stamp = readLocker.apply(lock); |
1167 |
assertEquals(i + 1, lock.getReadLockCount()); |
1168 |
assertTrue(lock.isReadLocked()); |
1169 |
stamps[i] = stamp; |
1170 |
} |
1171 |
for (int i = 0; i < depth; i++) { |
1172 |
BiConsumer<StampedLock, Long> readUnlocker |
1173 |
= readUnlockers.get(i % readUnlockers.size()); |
1174 |
assertEquals(depth - i, lock.getReadLockCount()); |
1175 |
assertTrue(lock.isReadLocked()); |
1176 |
readUnlocker.accept(lock, stamps[depth - 1 - i]); |
1177 |
} |
1178 |
assertUnlocked(lock); |
1179 |
} |
1180 |
} |