/** getState is true when acquired and false when not */
public void testGetState() {
final Mutex sync = new Mutex();
sync.acquire();
assertTrue(sync.isHeldExclusively());
sync.release();
assertFalse(sync.isHeldExclusively());
final BooleanLatch acquired = new BooleanLatch();
final BooleanLatch done = new BooleanLatch();
Thread t =
newStartedThread(
new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire();
assertTrue(acquired.releaseShared(0));
done.acquireShared(0);
sync.release();
}
});
acquired.acquireShared(0);
assertTrue(sync.isHeldExclusively());
assertTrue(done.releaseShared(0));
awaitTermination(t);
assertFalse(sync.isHeldExclusively());
}
/** tryAcquire on a released sync succeeds */
public void testTryAcquire() {
Mutex sync = new Mutex();
assertTrue(sync.tryAcquire());
assertTrue(sync.isHeldExclusively());
sync.release();
assertFalse(sync.isHeldExclusively());
}
/** A serialized AQS deserializes with current state, but no queued threads */
public void testSerialization() {
Mutex sync = new Mutex();
assertFalse(serialClone(sync).isHeldExclusively());
sync.acquire();
Thread t = newStartedThread(new InterruptedSyncRunnable(sync));
waitForQueuedThread(sync, t);
assertTrue(sync.isHeldExclusively());
Mutex clone = serialClone(sync);
assertTrue(clone.isHeldExclusively());
assertHasExclusiveQueuedThreads(sync, t);
assertHasExclusiveQueuedThreads(clone, NO_THREADS);
t.interrupt();
awaitTermination(t);
sync.release();
assertFalse(sync.isHeldExclusively());
assertTrue(clone.isHeldExclusively());
assertHasExclusiveQueuedThreads(sync, NO_THREADS);
assertHasExclusiveQueuedThreads(clone, NO_THREADS);
}
/** acquireInterruptibly succeeds when released, else is interruptible */
public void testAcquireInterruptibly() throws InterruptedException {
final Mutex sync = new Mutex();
final BooleanLatch threadStarted = new BooleanLatch();
sync.acquireInterruptibly();
Thread t =
newStartedThread(
new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
assertTrue(threadStarted.releaseShared(0));
sync.acquireInterruptibly();
}
});
threadStarted.acquireShared(0);
waitForQueuedThread(sync, t);
t.interrupt();
awaitTermination(t);
assertTrue(sync.isHeldExclusively());
}
/** isHeldExclusively is false upon construction */
public void testIsHeldExclusively() {
Mutex sync = new Mutex();
assertFalse(sync.isHeldExclusively());
}
