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/* |
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* Written by Doug Lea and Martin Buchholz with assistance from |
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* members of JCP JSR-166 Expert Group and released to the public |
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* domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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|
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.locks.*; |
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|
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public class LockSupportTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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} |
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|
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public static Test suite() { |
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return new TestSuite(LockSupportTest.class); |
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} |
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|
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/** |
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* park is released by subsequent unpark |
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*/ |
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public void testParkBeforeUnpark() throws InterruptedException { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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threadStarted.countDown(); |
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LockSupport.park(); |
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}}); |
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|
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threadStarted.await(); |
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Thread.sleep(SHORT_DELAY_MS); |
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LockSupport.unpark(t); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkUntil is released by subsequent unpark |
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*/ |
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public void testParkUntilBeforeUnpark() throws InterruptedException { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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long d = new Date().getTime() + LONG_DELAY_MS; |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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threadStarted.countDown(); |
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LockSupport.parkUntil(d); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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}}); |
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|
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threadStarted.await(); |
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Thread.sleep(SHORT_DELAY_MS); |
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LockSupport.unpark(t); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkNanos is released by subsequent unpark |
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*/ |
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public void testParkNanosBeforeUnpark() throws InterruptedException { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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threadStarted.countDown(); |
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LockSupport.parkNanos(nanos); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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}}); |
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|
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threadStarted.await(); |
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Thread.sleep(SHORT_DELAY_MS); |
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LockSupport.unpark(t); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* park is released by preceding unpark |
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*/ |
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public void testParkAfterUnpark() throws Exception { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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final AtomicBoolean unparked = new AtomicBoolean(false); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws Exception { |
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threadStarted.countDown(); |
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while (!unparked.get()) |
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Thread.yield(); |
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LockSupport.park(); |
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}}); |
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|
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threadStarted.await(); |
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LockSupport.unpark(t); |
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unparked.set(true); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkUntil is released by preceding unpark |
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*/ |
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public void testParkUntilAfterUnpark() throws Exception { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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final AtomicBoolean unparked = new AtomicBoolean(false); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws Exception { |
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threadStarted.countDown(); |
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while (!unparked.get()) |
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Thread.yield(); |
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long d = new Date().getTime() + LONG_DELAY_MS; |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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LockSupport.parkUntil(d); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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}}); |
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|
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threadStarted.await(); |
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LockSupport.unpark(t); |
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unparked.set(true); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkNanos is released by preceding unpark |
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*/ |
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public void testParkNanosAfterUnpark() throws Exception { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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final AtomicBoolean unparked = new AtomicBoolean(false); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws Exception { |
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threadStarted.countDown(); |
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while (!unparked.get()) |
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Thread.yield(); |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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LockSupport.parkNanos(nanos); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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}}); |
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|
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threadStarted.await(); |
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LockSupport.unpark(t); |
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unparked.set(true); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* park is released by subsequent interrupt |
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*/ |
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public void testParkBeforeInterrupt() throws InterruptedException { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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assertFalse(Thread.currentThread().isInterrupted()); |
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threadStarted.countDown(); |
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do { |
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LockSupport.park(); |
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// park may return spuriously |
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} while (! Thread.currentThread().isInterrupted()); |
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}}); |
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|
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threadStarted.await(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkUntil is released by subsequent interrupt |
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*/ |
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public void testParkUntilBeforeInterrupt() throws InterruptedException { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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long d = new Date().getTime() + LONG_DELAY_MS; |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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assertFalse(Thread.currentThread().isInterrupted()); |
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threadStarted.countDown(); |
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do { |
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LockSupport.parkUntil(d); |
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// parkUntil may return spuriously |
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} while (! Thread.currentThread().isInterrupted()); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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}}); |
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|
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threadStarted.await(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkNanos is released by subsequent interrupt |
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*/ |
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public void testParkNanosBeforeInterrupt() throws InterruptedException { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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assertFalse(Thread.currentThread().isInterrupted()); |
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threadStarted.countDown(); |
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do { |
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LockSupport.parkNanos(nanos); |
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// parkNanos may return spuriously |
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} while (! Thread.currentThread().isInterrupted()); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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}}); |
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|
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threadStarted.await(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* park is released by preceding interrupt |
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*/ |
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public void testParkAfterInterrupt() throws Exception { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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final AtomicBoolean unparked = new AtomicBoolean(false); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws Exception { |
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threadStarted.countDown(); |
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while (!unparked.get()) |
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Thread.yield(); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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LockSupport.park(); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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}}); |
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|
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threadStarted.await(); |
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t.interrupt(); |
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unparked.set(true); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkUntil is released by preceding interrupt |
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*/ |
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public void testParkUntilAfterInterrupt() throws Exception { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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final AtomicBoolean unparked = new AtomicBoolean(false); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws Exception { |
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threadStarted.countDown(); |
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while (!unparked.get()) |
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Thread.yield(); |
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long d = new Date().getTime() + LONG_DELAY_MS; |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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LockSupport.parkUntil(d); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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}}); |
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|
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threadStarted.await(); |
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t.interrupt(); |
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unparked.set(true); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkNanos is released by preceding interrupt |
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*/ |
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public void testParkNanosAfterInterrupt() throws Exception { |
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final CountDownLatch threadStarted = new CountDownLatch(1); |
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final AtomicBoolean unparked = new AtomicBoolean(false); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws Exception { |
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threadStarted.countDown(); |
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while (!unparked.get()) |
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Thread.yield(); |
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long nanos = LONG_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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LockSupport.parkNanos(nanos); |
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assertTrue(System.nanoTime() - t0 < nanos); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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}}); |
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|
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threadStarted.await(); |
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t.interrupt(); |
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unparked.set(true); |
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkNanos times out if not unparked |
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*/ |
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public void testParkNanosTimesOut() throws InterruptedException { |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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for (;;) { |
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long timeoutNanos = SHORT_DELAY_MS * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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LockSupport.parkNanos(timeoutNanos); |
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// parkNanos may return spuriously |
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if (System.nanoTime() - t0 >= timeoutNanos) |
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return; |
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} |
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}}); |
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|
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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|
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/** |
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* parkUntil times out if not unparked |
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*/ |
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public void testParkUntilTimesOut() throws InterruptedException { |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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for (;;) { |
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long d = new Date().getTime() + SHORT_DELAY_MS; |
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// beware of rounding |
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long timeoutNanos = (SHORT_DELAY_MS - 1) * 1000L * 1000L; |
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long t0 = System.nanoTime(); |
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LockSupport.parkUntil(d); |
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// parkUntil may return spuriously |
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if (System.nanoTime() - t0 >= timeoutNanos) |
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return; |
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} |
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}}); |
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|
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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|
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/** |
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* parkUntil(0) returns immediately |
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* Requires hotspot fix for: |
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* 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever |
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*/ |
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public void XXXXtestParkUntil0Returns() throws InterruptedException { |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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LockSupport.parkUntil(0L); |
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}}); |
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|
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awaitTermination(t, MEDIUM_DELAY_MS); |
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} |
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} |