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import junit.framework.*; |
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import java.util.*; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import static java.util.concurrent.TimeUnit.NANOSECONDS; |
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import java.util.concurrent.locks.AbstractQueuedSynchronizer; |
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import java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject; |
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} |
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/** A constant to clarify calls to checking methods below. */ |
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final static Thread[] NO_THREADS = new Thread[0]; |
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static final Thread[] NO_THREADS = new Thread[0]; |
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/** |
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* Spin-waits until sync.isQueued(t) becomes true. |
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new HashSet<Thread>(Arrays.asList(threads))); |
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} |
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enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }; |
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enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil } |
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/** |
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* Awaits condition using the specified AwaitMethod. |
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*/ |
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public void testTryAcquireSharedNanos_Timeout() { |
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final BooleanLatch l = new BooleanLatch(); |
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final BooleanLatch observedQueued = new BooleanLatch(); |
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final long timeoutMillis = timeoutMillis(); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws InterruptedException { |
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assertFalse(l.isSignalled()); |
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long startTime = System.nanoTime(); |
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long nanos = MILLISECONDS.toNanos(timeoutMillis()); |
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assertFalse(l.tryAcquireSharedNanos(0, nanos)); |
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assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
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for (long millis = timeoutMillis(); |
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!observedQueued.isSignalled(); |
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millis *= 2) { |
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long nanos = MILLISECONDS.toNanos(millis); |
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long startTime = System.nanoTime(); |
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assertFalse(l.tryAcquireSharedNanos(0, nanos)); |
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assertTrue(millisElapsedSince(startTime) >= millis); |
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} |
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assertFalse(l.isSignalled()); |
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}}); |
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waitForQueuedThread(l, t); |
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observedQueued.releaseShared(0); |
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assertFalse(l.isSignalled()); |
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awaitTermination(t); |
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assertFalse(l.isSignalled()); |
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} |
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/** |
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* awaitNanos/timed await with 0 wait times out immediately |
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*/ |
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public void testAwait_Zero() throws InterruptedException { |
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final Mutex sync = new Mutex(); |
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final ConditionObject c = sync.newCondition(); |
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sync.acquire(); |
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assertTrue(c.awaitNanos(0L) <= 0); |
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assertFalse(c.await(0L, NANOSECONDS)); |
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sync.release(); |
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} |
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|
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/** |
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* awaitNanos/timed await with maximum negative wait times does not underflow |
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*/ |
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public void testAwait_NegativeInfinity() throws InterruptedException { |
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final Mutex sync = new Mutex(); |
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final ConditionObject c = sync.newCondition(); |
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sync.acquire(); |
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assertTrue(c.awaitNanos(Long.MIN_VALUE) <= 0); |
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assertFalse(c.await(Long.MIN_VALUE, NANOSECONDS)); |
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sync.release(); |
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} |
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} |