/** 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);
}