/** hasWaiters returns true when a thread is waiting, else false */ public void testHasWaiters() { final Mutex sync = new Mutex(); final ConditionObject c = sync.newCondition(); final BooleanLatch acquired = new BooleanLatch(); Thread t = newStartedThread( new CheckedRunnable() { public void realRun() throws InterruptedException { sync.acquire(); assertHasWaitersLocked(sync, c, NO_THREADS); assertFalse(sync.hasWaiters(c)); assertTrue(acquired.releaseShared(0)); c.await(); sync.release(); } }); acquired.acquireShared(0); sync.acquire(); assertHasWaitersLocked(sync, c, t); assertHasExclusiveQueuedThreads(sync, NO_THREADS); assertTrue(sync.hasWaiters(c)); c.signal(); assertHasWaitersLocked(sync, c, NO_THREADS); assertHasExclusiveQueuedThreads(sync, t); assertFalse(sync.hasWaiters(c)); sync.release(); awaitTermination(t); assertHasWaitersUnlocked(sync, c, NO_THREADS); }
/** awaitUninterruptibly is uninterruptible */ public void testAwaitUninterruptibly() { final Mutex sync = new Mutex(); final ConditionObject c = sync.newCondition(); final BooleanLatch pleaseInterrupt = new BooleanLatch(); Thread t = newStartedThread( new CheckedRunnable() { public void realRun() { sync.acquire(); assertTrue(pleaseInterrupt.releaseShared(0)); c.awaitUninterruptibly(); assertTrue(Thread.interrupted()); assertHasWaitersLocked(sync, c, NO_THREADS); sync.release(); } }); pleaseInterrupt.acquireShared(0); sync.acquire(); assertHasWaitersLocked(sync, c, t); sync.release(); t.interrupt(); assertHasWaitersUnlocked(sync, c, t); assertThreadStaysAlive(t); sync.acquire(); assertHasWaitersLocked(sync, c, t); assertHasExclusiveQueuedThreads(sync, NO_THREADS); c.signal(); assertHasWaitersLocked(sync, c, NO_THREADS); assertHasExclusiveQueuedThreads(sync, t); sync.release(); awaitTermination(t); }
/** Calling signal without holding sync throws IllegalMonitorStateException */ public void testSignal_IMSE() { final Mutex sync = new Mutex(); final ConditionObject c = sync.newCondition(); try { c.signal(); shouldThrow(); } catch (IllegalMonitorStateException success) { } assertHasWaitersUnlocked(sync, c, NO_THREADS); }