376 |
|
} |
377 |
|
} |
378 |
|
|
379 |
+ |
/** |
380 |
+ |
* Read trylock succeeds if write locked by current thread |
381 |
+ |
*/ |
382 |
+ |
public void testReadHoldingWriteLock() { |
383 |
+ |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
384 |
+ |
lock.writeLock().lock(); |
385 |
+ |
assertTrue(lock.readLock().tryLock()); |
386 |
+ |
lock.readLock().unlock(); |
387 |
+ |
lock.writeLock().unlock(); |
388 |
+ |
} |
389 |
+ |
|
390 |
+ |
/** |
391 |
+ |
* Read lock succeeds if write locked by current thread even if |
392 |
+ |
* other threads are waiting |
393 |
+ |
*/ |
394 |
+ |
public void testReadHoldingWriteLock2() { |
395 |
+ |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
396 |
+ |
lock.writeLock().lock(); |
397 |
+ |
Thread t1 = new Thread(new Runnable() { |
398 |
+ |
public void run() { |
399 |
+ |
lock.readLock().lock(); |
400 |
+ |
lock.readLock().unlock(); |
401 |
+ |
} |
402 |
+ |
}); |
403 |
+ |
Thread t2 = new Thread(new Runnable() { |
404 |
+ |
public void run() { |
405 |
+ |
lock.readLock().lock(); |
406 |
+ |
lock.readLock().unlock(); |
407 |
+ |
} |
408 |
+ |
}); |
409 |
+ |
|
410 |
+ |
try { |
411 |
+ |
t1.start(); |
412 |
+ |
t2.start(); |
413 |
+ |
lock.readLock().lock(); |
414 |
+ |
lock.readLock().unlock(); |
415 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
416 |
+ |
lock.readLock().lock(); |
417 |
+ |
lock.readLock().unlock(); |
418 |
+ |
lock.writeLock().unlock(); |
419 |
+ |
t1.join(MEDIUM_DELAY_MS); |
420 |
+ |
t2.join(MEDIUM_DELAY_MS); |
421 |
+ |
assertTrue(!t1.isAlive()); |
422 |
+ |
assertTrue(!t2.isAlive()); |
423 |
+ |
|
424 |
+ |
} catch(Exception e){ |
425 |
+ |
unexpectedException(); |
426 |
+ |
} |
427 |
+ |
} |
428 |
+ |
|
429 |
+ |
/** |
430 |
+ |
* Fair Read trylock succeeds if write locked by current thread |
431 |
+ |
*/ |
432 |
+ |
public void testReadHoldingWriteLockFair() { |
433 |
+ |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
434 |
+ |
lock.writeLock().lock(); |
435 |
+ |
assertTrue(lock.readLock().tryLock()); |
436 |
+ |
lock.readLock().unlock(); |
437 |
+ |
lock.writeLock().unlock(); |
438 |
+ |
} |
439 |
+ |
|
440 |
+ |
/** |
441 |
+ |
* Fair Read lock succeeds if write locked by current thread even if |
442 |
+ |
* other threads are waiting |
443 |
+ |
*/ |
444 |
+ |
public void testReadHoldingWriteLockFair2() { |
445 |
+ |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
446 |
+ |
lock.writeLock().lock(); |
447 |
+ |
Thread t1 = new Thread(new Runnable() { |
448 |
+ |
public void run() { |
449 |
+ |
lock.readLock().lock(); |
450 |
+ |
lock.readLock().unlock(); |
451 |
+ |
} |
452 |
+ |
}); |
453 |
+ |
Thread t2 = new Thread(new Runnable() { |
454 |
+ |
public void run() { |
455 |
+ |
lock.readLock().lock(); |
456 |
+ |
lock.readLock().unlock(); |
457 |
+ |
} |
458 |
+ |
}); |
459 |
+ |
|
460 |
+ |
try { |
461 |
+ |
t1.start(); |
462 |
+ |
t2.start(); |
463 |
+ |
lock.readLock().lock(); |
464 |
+ |
lock.readLock().unlock(); |
465 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
466 |
+ |
lock.readLock().lock(); |
467 |
+ |
lock.readLock().unlock(); |
468 |
+ |
lock.writeLock().unlock(); |
469 |
+ |
t1.join(MEDIUM_DELAY_MS); |
470 |
+ |
t2.join(MEDIUM_DELAY_MS); |
471 |
+ |
assertTrue(!t1.isAlive()); |
472 |
+ |
assertTrue(!t2.isAlive()); |
473 |
+ |
|
474 |
+ |
} catch(Exception e){ |
475 |
+ |
unexpectedException(); |
476 |
+ |
} |
477 |
+ |
} |
478 |
+ |
|
479 |
|
|
480 |
|
/** |
481 |
|
* Read tryLock succeeds if readlocked but not writelocked |
977 |
|
} |
978 |
|
|
979 |
|
/** |
980 |
+ |
* hasQueuedThread(null) throws NPE |
981 |
+ |
*/ |
982 |
+ |
public void testHasQueuedThreadNPE() { |
983 |
+ |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
984 |
+ |
try { |
985 |
+ |
sync.hasQueuedThread(null); |
986 |
+ |
shouldThrow(); |
987 |
+ |
} catch (NullPointerException success) { |
988 |
+ |
} |
989 |
+ |
} |
990 |
+ |
|
991 |
+ |
/** |
992 |
+ |
* hasQueuedThread reports whether a thread is queued. |
993 |
+ |
*/ |
994 |
+ |
public void testHasQueuedThread() { |
995 |
+ |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
996 |
+ |
Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
997 |
+ |
Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
998 |
+ |
try { |
999 |
+ |
assertFalse(sync.hasQueuedThread(t1)); |
1000 |
+ |
assertFalse(sync.hasQueuedThread(t2)); |
1001 |
+ |
sync.writeLock().lock(); |
1002 |
+ |
t1.start(); |
1003 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
1004 |
+ |
assertTrue(sync.hasQueuedThread(t1)); |
1005 |
+ |
t2.start(); |
1006 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
1007 |
+ |
assertTrue(sync.hasQueuedThread(t1)); |
1008 |
+ |
assertTrue(sync.hasQueuedThread(t2)); |
1009 |
+ |
t1.interrupt(); |
1010 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
1011 |
+ |
assertFalse(sync.hasQueuedThread(t1)); |
1012 |
+ |
assertTrue(sync.hasQueuedThread(t2)); |
1013 |
+ |
sync.writeLock().unlock(); |
1014 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
1015 |
+ |
assertFalse(sync.hasQueuedThread(t1)); |
1016 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
1017 |
+ |
assertFalse(sync.hasQueuedThread(t2)); |
1018 |
+ |
t1.join(); |
1019 |
+ |
t2.join(); |
1020 |
+ |
} catch(Exception e){ |
1021 |
+ |
unexpectedException(); |
1022 |
+ |
} |
1023 |
+ |
} |
1024 |
+ |
|
1025 |
+ |
|
1026 |
+ |
/** |
1027 |
|
* getQueueLength reports number of waiting threads |
1028 |
|
*/ |
1029 |
|
public void testGetQueueLength() { |