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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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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/publicdomain/zero/1.0/ |
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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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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.locks.*; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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|
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public class LockSupportTest extends JSR166TestCase{ |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.locks.LockSupport; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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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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main(suite(), args); |
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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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return new TestSuite(LockSupportTest.class); |
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} |
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|
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static { |
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// Reduce the risk of rare disastrous classloading in first call to |
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// LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773 |
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Class<?> ensureLoaded = LockSupport.class; |
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} |
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|
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/** |
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* |
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* Returns the blocker object used by tests in this file. |
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* Any old object will do; we'll return a convenient one. |
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*/ |
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public void testUnpark() { |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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LockSupport.park(); |
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} catch(Exception e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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t.start(); |
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try { |
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LockSupport.unpark(t); |
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t.join(); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
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static Object theBlocker() { |
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return LockSupportTest.class; |
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} |
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|
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enum ParkMethod { |
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park() { |
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void park() { |
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LockSupport.park(); |
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} |
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void park(long millis) { |
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throw new UnsupportedOperationException(); |
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} |
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}, |
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parkUntil() { |
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void park(long millis) { |
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LockSupport.parkUntil(deadline(millis)); |
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} |
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}, |
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parkNanos() { |
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void park(long millis) { |
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LockSupport.parkNanos(MILLISECONDS.toNanos(millis)); |
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} |
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}, |
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parkBlocker() { |
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void park() { |
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LockSupport.park(theBlocker()); |
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} |
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void park(long millis) { |
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throw new UnsupportedOperationException(); |
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} |
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}, |
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parkUntilBlocker() { |
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void park(long millis) { |
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LockSupport.parkUntil(theBlocker(), deadline(millis)); |
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} |
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}, |
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parkNanosBlocker() { |
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void park(long millis) { |
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LockSupport.parkNanos(theBlocker(), |
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MILLISECONDS.toNanos(millis)); |
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} |
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}; |
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|
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void park() { park(2 * LONG_DELAY_MS); } |
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abstract void park(long millis); |
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|
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/** Returns a deadline to use with parkUntil. */ |
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long deadline(long millis) { |
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// beware of rounding |
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return System.currentTimeMillis() + millis + 1; |
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} |
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} |
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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 testParkNanos() { |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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LockSupport.parkNanos(1000); |
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} catch(Exception e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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try { |
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t.start(); |
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t.join(); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
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} |
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public void testParkBeforeUnpark_park() { |
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testParkBeforeUnpark(ParkMethod.park); |
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} |
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public void testParkBeforeUnpark_parkNanos() { |
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testParkBeforeUnpark(ParkMethod.parkNanos); |
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} |
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public void testParkBeforeUnpark_parkUntil() { |
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testParkBeforeUnpark(ParkMethod.parkUntil); |
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} |
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public void testParkBeforeUnpark_parkBlocker() { |
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testParkBeforeUnpark(ParkMethod.parkBlocker); |
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} |
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public void testParkBeforeUnpark_parkNanosBlocker() { |
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testParkBeforeUnpark(ParkMethod.parkNanosBlocker); |
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} |
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public void testParkBeforeUnpark_parkUntilBlocker() { |
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testParkBeforeUnpark(ParkMethod.parkUntilBlocker); |
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} |
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public void testParkBeforeUnpark(final ParkMethod parkMethod) { |
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final CountDownLatch pleaseUnpark = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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pleaseUnpark.countDown(); |
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parkMethod.park(); |
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}}); |
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|
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await(pleaseUnpark); |
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LockSupport.unpark(t); |
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awaitTermination(t); |
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} |
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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_park() { |
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testParkAfterUnpark(ParkMethod.park); |
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} |
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public void testParkAfterUnpark_parkNanos() { |
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testParkAfterUnpark(ParkMethod.parkNanos); |
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} |
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public void testParkAfterUnpark_parkUntil() { |
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testParkAfterUnpark(ParkMethod.parkUntil); |
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} |
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public void testParkAfterUnpark_parkBlocker() { |
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testParkAfterUnpark(ParkMethod.parkBlocker); |
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} |
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public void testParkAfterUnpark_parkNanosBlocker() { |
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testParkAfterUnpark(ParkMethod.parkNanosBlocker); |
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} |
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public void testParkAfterUnpark_parkUntilBlocker() { |
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testParkAfterUnpark(ParkMethod.parkUntilBlocker); |
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} |
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public void testParkAfterUnpark(final ParkMethod parkMethod) { |
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final CountDownLatch pleaseUnpark = new CountDownLatch(1); |
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final AtomicBoolean pleasePark = new AtomicBoolean(false); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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pleaseUnpark.countDown(); |
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while (!pleasePark.get()) |
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Thread.yield(); |
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parkMethod.park(); |
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}}); |
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|
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await(pleaseUnpark); |
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LockSupport.unpark(t); |
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pleasePark.set(true); |
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awaitTermination(t); |
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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_park() { |
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testParkBeforeInterrupt(ParkMethod.park); |
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} |
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public void testParkBeforeInterrupt_parkNanos() { |
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testParkBeforeInterrupt(ParkMethod.parkNanos); |
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} |
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public void testParkBeforeInterrupt_parkUntil() { |
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testParkBeforeInterrupt(ParkMethod.parkUntil); |
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} |
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public void testParkBeforeInterrupt_parkBlocker() { |
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testParkBeforeInterrupt(ParkMethod.parkBlocker); |
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} |
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public void testParkBeforeInterrupt_parkNanosBlocker() { |
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testParkBeforeInterrupt(ParkMethod.parkNanosBlocker); |
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} |
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public void testParkBeforeInterrupt_parkUntilBlocker() { |
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testParkBeforeInterrupt(ParkMethod.parkUntilBlocker); |
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} |
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public void testParkBeforeInterrupt(final ParkMethod parkMethod) { |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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pleaseInterrupt.countDown(); |
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do { |
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parkMethod.park(); |
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// park may return spuriously |
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} while (! Thread.interrupted()); |
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}}); |
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|
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await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
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t.interrupt(); |
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awaitTermination(t); |
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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_park() { |
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testParkAfterInterrupt(ParkMethod.park); |
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} |
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public void testParkAfterInterrupt_parkNanos() { |
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testParkAfterInterrupt(ParkMethod.parkNanos); |
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} |
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public void testParkAfterInterrupt_parkUntil() { |
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testParkAfterInterrupt(ParkMethod.parkUntil); |
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} |
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public void testParkAfterInterrupt_parkBlocker() { |
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testParkAfterInterrupt(ParkMethod.parkBlocker); |
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} |
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public void testParkAfterInterrupt_parkNanosBlocker() { |
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testParkAfterInterrupt(ParkMethod.parkNanosBlocker); |
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} |
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public void testParkAfterInterrupt_parkUntilBlocker() { |
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testParkAfterInterrupt(ParkMethod.parkUntilBlocker); |
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} |
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public void testParkAfterInterrupt(final ParkMethod parkMethod) { |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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final AtomicBoolean pleasePark = 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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pleaseInterrupt.countDown(); |
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while (!pleasePark.get()) |
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Thread.yield(); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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parkMethod.park(); |
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assertTrue(Thread.currentThread().isInterrupted()); |
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}}); |
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|
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await(pleaseInterrupt); |
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t.interrupt(); |
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pleasePark.set(true); |
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awaitTermination(t); |
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} |
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|
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/** |
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* timed park times out if not unparked |
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*/ |
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public void testParkTimesOut_parkNanos() { |
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testParkTimesOut(ParkMethod.parkNanos); |
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} |
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public void testParkTimesOut_parkUntil() { |
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testParkTimesOut(ParkMethod.parkUntil); |
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} |
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public void testParkTimesOut_parkNanosBlocker() { |
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testParkTimesOut(ParkMethod.parkNanosBlocker); |
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} |
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public void testParkTimesOut_parkUntilBlocker() { |
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testParkTimesOut(ParkMethod.parkUntilBlocker); |
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} |
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public void testParkTimesOut(final ParkMethod parkMethod) { |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) { |
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long startTime = System.nanoTime(); |
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parkMethod.park(timeoutMillis()); |
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// park may return spuriously |
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if (millisElapsedSince(startTime) >= timeoutMillis()) |
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return; |
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} |
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fail("too many consecutive spurious wakeups?"); |
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}}); |
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|
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awaitTermination(t); |
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} |
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> |
|
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/** |
273 |
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* getBlocker(null) throws NullPointerException |
274 |
|
*/ |
275 |
< |
public void testParkUntil() { |
276 |
< |
Thread t = new Thread(new Runnable() { |
277 |
< |
public void run() { |
278 |
< |
try { |
279 |
< |
long d = new Date().getTime() + 100; |
280 |
< |
LockSupport.parkUntil(d); |
281 |
< |
} catch(Exception e){ |
282 |
< |
threadUnexpectedException(); |
283 |
< |
} |
284 |
< |
} |
285 |
< |
}); |
286 |
< |
try { |
287 |
< |
t.start(); |
288 |
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t.join(); |
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< |
} |
290 |
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catch(Exception e) { |
291 |
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unexpectedException(); |
275 |
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public void testGetBlockerNull() { |
276 |
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try { |
277 |
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LockSupport.getBlocker(null); |
278 |
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shouldThrow(); |
279 |
> |
} catch (NullPointerException success) {} |
280 |
> |
} |
281 |
> |
|
282 |
> |
/** |
283 |
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* getBlocker returns the blocker object passed to park |
284 |
> |
*/ |
285 |
> |
public void testGetBlocker_parkBlocker() { |
286 |
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testGetBlocker(ParkMethod.parkBlocker); |
287 |
> |
} |
288 |
> |
public void testGetBlocker_parkNanosBlocker() { |
289 |
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testGetBlocker(ParkMethod.parkNanosBlocker); |
290 |
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} |
291 |
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public void testGetBlocker_parkUntilBlocker() { |
292 |
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testGetBlocker(ParkMethod.parkUntilBlocker); |
293 |
> |
} |
294 |
> |
public void testGetBlocker(final ParkMethod parkMethod) { |
295 |
> |
final CountDownLatch started = new CountDownLatch(1); |
296 |
> |
Thread t = newStartedThread(new CheckedRunnable() { |
297 |
> |
public void realRun() { |
298 |
> |
Thread t = Thread.currentThread(); |
299 |
> |
started.countDown(); |
300 |
> |
do { |
301 |
> |
assertNull(LockSupport.getBlocker(t)); |
302 |
> |
parkMethod.park(); |
303 |
> |
assertNull(LockSupport.getBlocker(t)); |
304 |
> |
// park may return spuriously |
305 |
> |
} while (! Thread.interrupted()); |
306 |
> |
}}); |
307 |
> |
|
308 |
> |
long startTime = System.nanoTime(); |
309 |
> |
await(started); |
310 |
> |
for (;;) { |
311 |
> |
Object x = LockSupport.getBlocker(t); |
312 |
> |
if (x == theBlocker()) { // success |
313 |
> |
t.interrupt(); |
314 |
> |
awaitTermination(t); |
315 |
> |
assertNull(LockSupport.getBlocker(t)); |
316 |
> |
return; |
317 |
> |
} else { |
318 |
> |
assertNull(x); // ok |
319 |
> |
if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
320 |
> |
fail("timed out"); |
321 |
> |
Thread.yield(); |
322 |
> |
} |
323 |
|
} |
324 |
|
} |
325 |
+ |
|
326 |
+ |
/** |
327 |
+ |
* timed park(0) returns immediately. |
328 |
+ |
* |
329 |
+ |
* Requires hotspot fix for: |
330 |
+ |
* 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever |
331 |
+ |
* which is in jdk7-b118 and 6u25. |
332 |
+ |
*/ |
333 |
+ |
public void testPark0_parkNanos() { |
334 |
+ |
testPark0(ParkMethod.parkNanos); |
335 |
+ |
} |
336 |
+ |
public void testPark0_parkUntil() { |
337 |
+ |
testPark0(ParkMethod.parkUntil); |
338 |
+ |
} |
339 |
+ |
public void testPark0_parkNanosBlocker() { |
340 |
+ |
testPark0(ParkMethod.parkNanosBlocker); |
341 |
+ |
} |
342 |
+ |
public void testPark0_parkUntilBlocker() { |
343 |
+ |
testPark0(ParkMethod.parkUntilBlocker); |
344 |
+ |
} |
345 |
+ |
public void testPark0(final ParkMethod parkMethod) { |
346 |
+ |
Thread t = newStartedThread(new CheckedRunnable() { |
347 |
+ |
public void realRun() { |
348 |
+ |
parkMethod.park(0L); |
349 |
+ |
}}); |
350 |
+ |
|
351 |
+ |
awaitTermination(t); |
352 |
+ |
} |
353 |
+ |
|
354 |
+ |
/** |
355 |
+ |
* timed park(Long.MIN_VALUE) returns immediately. |
356 |
+ |
*/ |
357 |
+ |
public void testParkNeg_parkNanos() { |
358 |
+ |
testParkNeg(ParkMethod.parkNanos); |
359 |
+ |
} |
360 |
+ |
public void testParkNeg_parkUntil() { |
361 |
+ |
testParkNeg(ParkMethod.parkUntil); |
362 |
+ |
} |
363 |
+ |
public void testParkNeg_parkNanosBlocker() { |
364 |
+ |
testParkNeg(ParkMethod.parkNanosBlocker); |
365 |
+ |
} |
366 |
+ |
public void testParkNeg_parkUntilBlocker() { |
367 |
+ |
testParkNeg(ParkMethod.parkUntilBlocker); |
368 |
+ |
} |
369 |
+ |
public void testParkNeg(final ParkMethod parkMethod) { |
370 |
+ |
Thread t = newStartedThread(new CheckedRunnable() { |
371 |
+ |
public void realRun() { |
372 |
+ |
parkMethod.park(Long.MIN_VALUE); |
373 |
+ |
}}); |
374 |
+ |
|
375 |
+ |
awaitTermination(t); |
376 |
+ |
} |
377 |
|
} |