/** releaseShared has no effect when already signalled */
public void testReleaseShared() {
final BooleanLatch l = new BooleanLatch();
assertFalse(l.isSignalled());
assertTrue(l.releaseShared(0));
assertTrue(l.isSignalled());
assertTrue(l.releaseShared(0));
assertTrue(l.isSignalled());
}
/** 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());
}
/** getSharedQueuedThreads returns all shared waiting threads */
public void testGetSharedQueuedThreads_Shared() {
final BooleanLatch l = new BooleanLatch();
assertHasSharedQueuedThreads(l, NO_THREADS);
Thread t1 =
newStartedThread(
new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
l.acquireSharedInterruptibly(0);
}
});
waitForQueuedThread(l, t1);
assertHasSharedQueuedThreads(l, t1);
Thread t2 =
newStartedThread(
new CheckedRunnable() {
public void realRun() throws InterruptedException {
l.acquireSharedInterruptibly(0);
}
});
waitForQueuedThread(l, t2);
assertHasSharedQueuedThreads(l, t1, t2);
t1.interrupt();
awaitTermination(t1);
assertHasSharedQueuedThreads(l, t2);
assertTrue(l.releaseShared(0));
awaitTermination(t2);
assertHasSharedQueuedThreads(l, NO_THREADS);
}
/** tryAcquireSharedNanos times out if not released before timeout */
public void testTryAcquireSharedNanos_Timeout() {
final BooleanLatch l = new BooleanLatch();
final BooleanLatch observedQueued = new BooleanLatch();
final long timeoutMillis = timeoutMillis();
Thread t =
newStartedThread(
new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
for (long millis = timeoutMillis(); !observedQueued.isSignalled(); millis *= 2) {
long nanos = MILLISECONDS.toNanos(millis);
long startTime = System.nanoTime();
assertFalse(l.tryAcquireSharedNanos(0, nanos));
assertTrue(millisElapsedSince(startTime) >= millis);
}
assertFalse(l.isSignalled());
}
});
waitForQueuedThread(l, t);
observedQueued.releaseShared(0);
assertFalse(l.isSignalled());
awaitTermination(t);
assertFalse(l.isSignalled());
}
/** tryAcquireSharedNanos returns after release, but not before */
public void testTryAcquireSharedNanos() {
final BooleanLatch l = new BooleanLatch();
Thread t =
newStartedThread(
new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS);
assertTrue(l.tryAcquireSharedNanos(0, nanos));
assertTrue(l.isSignalled());
assertTrue(l.tryAcquireSharedNanos(0, nanos));
assertTrue(l.isSignalled());
}
});
waitForQueuedThread(l, t);
assertFalse(l.isSignalled());
assertThreadStaysAlive(t);
assertTrue(l.releaseShared(0));
assertTrue(l.isSignalled());
awaitTermination(t);
}
/** acquireSharedInterruptibly returns after release, but not before */
public void testAcquireSharedInterruptibly() {
final BooleanLatch l = new BooleanLatch();
Thread t =
newStartedThread(
new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
l.acquireSharedInterruptibly(0);
assertTrue(l.isSignalled());
l.acquireSharedInterruptibly(0);
assertTrue(l.isSignalled());
}
});
waitForQueuedThread(l, t);
assertFalse(l.isSignalled());
assertThreadStaysAlive(t);
assertHasSharedQueuedThreads(l, t);
assertTrue(l.releaseShared(0));
assertTrue(l.isSignalled());
awaitTermination(t);
}