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 |
691 |
|
final Condition c = lock.writeLock().newCondition(); |
692 |
|
try { |
693 |
|
lock.writeLock().lock(); |
594 |
– |
assertFalse(c.await(10, TimeUnit.MILLISECONDS)); |
694 |
|
lock.writeLock().unlock(); |
695 |
|
} |
696 |
|
catch (Exception ex) { |
707 |
|
try { |
708 |
|
lock.writeLock().lock(); |
709 |
|
java.util.Date d = new java.util.Date(); |
611 |
– |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
710 |
|
lock.writeLock().unlock(); |
711 |
|
} |
712 |
|
catch (Exception ex) { |
747 |
|
} |
748 |
|
} |
749 |
|
|
750 |
+ |
/** A helper class for uninterruptible wait tests */ |
751 |
+ |
class UninterruptableThread extends Thread { |
752 |
+ |
private Lock lock; |
753 |
+ |
private Condition c; |
754 |
+ |
|
755 |
+ |
public volatile boolean canAwake = false; |
756 |
+ |
public volatile boolean interrupted = false; |
757 |
+ |
public volatile boolean lockStarted = false; |
758 |
+ |
|
759 |
+ |
public UninterruptableThread(Lock lock, Condition c) { |
760 |
+ |
this.lock = lock; |
761 |
+ |
this.c = c; |
762 |
+ |
} |
763 |
+ |
|
764 |
+ |
public synchronized void run() { |
765 |
+ |
lock.lock(); |
766 |
+ |
lockStarted = true; |
767 |
+ |
|
768 |
+ |
while (!canAwake) { |
769 |
+ |
c.awaitUninterruptibly(); |
770 |
+ |
} |
771 |
+ |
|
772 |
+ |
interrupted = isInterrupted(); |
773 |
+ |
lock.unlock(); |
774 |
+ |
} |
775 |
+ |
} |
776 |
+ |
|
777 |
|
/** |
778 |
|
* awaitUninterruptibly doesn't abort on interrupt |
779 |
|
*/ |
780 |
|
public void testAwaitUninterruptibly() { |
781 |
< |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
781 |
> |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
782 |
|
final Condition c = lock.writeLock().newCondition(); |
783 |
< |
Thread t = new Thread(new Runnable() { |
659 |
< |
public void run() { |
660 |
< |
lock.writeLock().lock(); |
661 |
< |
c.awaitUninterruptibly(); |
662 |
< |
lock.writeLock().unlock(); |
663 |
< |
} |
664 |
< |
}); |
783 |
> |
UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c); |
784 |
|
|
785 |
|
try { |
786 |
< |
t.start(); |
787 |
< |
Thread.sleep(SHORT_DELAY_MS); |
788 |
< |
t.interrupt(); |
786 |
> |
thread.start(); |
787 |
> |
|
788 |
> |
while (!thread.lockStarted) { |
789 |
> |
Thread.sleep(100); |
790 |
> |
} |
791 |
> |
|
792 |
|
lock.writeLock().lock(); |
793 |
< |
c.signal(); |
794 |
< |
lock.writeLock().unlock(); |
795 |
< |
assert(t.isInterrupted()); |
796 |
< |
t.join(SHORT_DELAY_MS); |
797 |
< |
assertFalse(t.isAlive()); |
798 |
< |
} |
799 |
< |
catch (Exception ex) { |
793 |
> |
try { |
794 |
> |
thread.interrupt(); |
795 |
> |
thread.canAwake = true; |
796 |
> |
c.signal(); |
797 |
> |
} finally { |
798 |
> |
lock.writeLock().unlock(); |
799 |
> |
} |
800 |
> |
|
801 |
> |
thread.join(); |
802 |
> |
assertTrue(thread.interrupted); |
803 |
> |
assertFalse(thread.isAlive()); |
804 |
> |
} catch (Exception ex) { |
805 |
|
unexpectedException(); |
806 |
|
} |
807 |
|
} |