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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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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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|
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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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* park is released by unpark occurring after park |
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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 testPark() { |
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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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try { |
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t.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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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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Thread.State parkedState() { return Thread.State.WAITING; } |
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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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Thread.State parkedState() { return Thread.State.WAITING; } |
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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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void park(long millis) { |
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throw new UnsupportedOperationException(); |
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} |
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Thread.State parkedState() { return Thread.State.TIMED_WAITING; } |
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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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* park is released by unpark occurring before park |
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* park is released by subsequent unpark |
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*/ |
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public void testPark2() { |
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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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Thread.sleep(SHORT_DELAY_MS); |
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LockSupport.park(); |
99 |
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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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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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} |
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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(); |
116 |
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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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* park is released by interrupt |
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* park is released by preceding unpark |
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*/ |
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public void testPark3() { |
128 |
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Thread t = new Thread(new Runnable() { |
129 |
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public void run() { |
130 |
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try { |
131 |
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LockSupport.park(); |
132 |
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} catch(Exception e){ |
133 |
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threadUnexpectedException(); |
134 |
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} |
135 |
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} |
136 |
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}); |
137 |
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try { |
138 |
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t.start(); |
139 |
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Thread.sleep(SHORT_DELAY_MS); |
140 |
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t.interrupt(); |
141 |
< |
t.join(); |
142 |
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} |
143 |
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catch(Exception e) { |
144 |
< |
unexpectedException(); |
145 |
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} |
127 |
> |
public void testParkAfterUnpark_park() { |
128 |
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testParkAfterUnpark(ParkMethod.park); |
129 |
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} |
130 |
> |
public void testParkAfterUnpark_parkNanos() { |
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testParkAfterUnpark(ParkMethod.parkNanos); |
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} |
133 |
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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); |
138 |
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} |
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public void testParkAfterUnpark_parkNanosBlocker() { |
140 |
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testParkAfterUnpark(ParkMethod.parkNanosBlocker); |
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} |
142 |
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public void testParkAfterUnpark_parkUntilBlocker() { |
143 |
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testParkAfterUnpark(ParkMethod.parkUntilBlocker); |
144 |
> |
} |
145 |
> |
public void testParkAfterUnpark(final ParkMethod parkMethod) { |
146 |
> |
final CountDownLatch pleaseUnpark = new CountDownLatch(1); |
147 |
> |
final AtomicBoolean pleasePark = new AtomicBoolean(false); |
148 |
> |
Thread t = newStartedThread(new CheckedRunnable() { |
149 |
> |
public void realRun() { |
150 |
> |
pleaseUnpark.countDown(); |
151 |
> |
while (!pleasePark.get()) |
152 |
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Thread.yield(); |
153 |
> |
parkMethod.park(); |
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> |
}}); |
155 |
> |
|
156 |
> |
await(pleaseUnpark); |
157 |
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LockSupport.unpark(t); |
158 |
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pleasePark.set(true); |
159 |
> |
awaitTermination(t); |
160 |
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} |
161 |
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|
162 |
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/** |
163 |
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* park returns if interrupted before park |
163 |
> |
* park is released by subsequent interrupt |
164 |
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*/ |
165 |
< |
public void testPark4() { |
166 |
< |
final ReentrantLock lock = new ReentrantLock(); |
167 |
< |
lock.lock(); |
168 |
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Thread t = new Thread(new Runnable() { |
169 |
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public void run() { |
170 |
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try { |
171 |
< |
lock.lock(); |
172 |
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LockSupport.park(); |
173 |
< |
} catch(Exception e){ |
174 |
< |
threadUnexpectedException(); |
175 |
< |
} |
176 |
< |
} |
177 |
< |
}); |
178 |
< |
try { |
179 |
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t.start(); |
180 |
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t.interrupt(); |
181 |
< |
lock.unlock(); |
182 |
< |
t.join(); |
183 |
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} |
184 |
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catch(Exception e) { |
185 |
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unexpectedException(); |
186 |
< |
} |
165 |
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public void testParkBeforeInterrupt_park() { |
166 |
> |
testParkBeforeInterrupt(ParkMethod.park); |
167 |
> |
} |
168 |
> |
public void testParkBeforeInterrupt_parkNanos() { |
169 |
> |
testParkBeforeInterrupt(ParkMethod.parkNanos); |
170 |
> |
} |
171 |
> |
public void testParkBeforeInterrupt_parkUntil() { |
172 |
> |
testParkBeforeInterrupt(ParkMethod.parkUntil); |
173 |
> |
} |
174 |
> |
public void testParkBeforeInterrupt_parkBlocker() { |
175 |
> |
testParkBeforeInterrupt(ParkMethod.parkBlocker); |
176 |
> |
} |
177 |
> |
public void testParkBeforeInterrupt_parkNanosBlocker() { |
178 |
> |
testParkBeforeInterrupt(ParkMethod.parkNanosBlocker); |
179 |
> |
} |
180 |
> |
public void testParkBeforeInterrupt_parkUntilBlocker() { |
181 |
> |
testParkBeforeInterrupt(ParkMethod.parkUntilBlocker); |
182 |
> |
} |
183 |
> |
public void testParkBeforeInterrupt(final ParkMethod parkMethod) { |
184 |
> |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
185 |
> |
Thread t = newStartedThread(new CheckedRunnable() { |
186 |
> |
public void realRun() { |
187 |
> |
pleaseInterrupt.countDown(); |
188 |
> |
for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) { |
189 |
> |
parkMethod.park(); |
190 |
> |
if (Thread.interrupted()) |
191 |
> |
return; |
192 |
> |
} |
193 |
> |
fail("too many consecutive spurious wakeups?"); |
194 |
> |
}}); |
195 |
> |
|
196 |
> |
await(pleaseInterrupt); |
197 |
> |
assertThreadBlocks(t, parkMethod.parkedState()); |
198 |
> |
t.interrupt(); |
199 |
> |
awaitTermination(t); |
200 |
|
} |
201 |
|
|
202 |
|
/** |
203 |
< |
* parkNanos times out if not unparked |
203 |
> |
* park is released by preceding interrupt |
204 |
|
*/ |
205 |
< |
public void testParkNanos() { |
206 |
< |
Thread t = new Thread(new Runnable() { |
207 |
< |
public void run() { |
208 |
< |
try { |
209 |
< |
LockSupport.parkNanos(1000); |
210 |
< |
} catch(Exception e){ |
211 |
< |
threadUnexpectedException(); |
212 |
< |
} |
213 |
< |
} |
214 |
< |
}); |
215 |
< |
try { |
135 |
< |
t.start(); |
136 |
< |
t.join(); |
137 |
< |
} |
138 |
< |
catch(Exception e) { |
139 |
< |
unexpectedException(); |
140 |
< |
} |
205 |
> |
public void testParkAfterInterrupt_park() { |
206 |
> |
testParkAfterInterrupt(ParkMethod.park); |
207 |
> |
} |
208 |
> |
public void testParkAfterInterrupt_parkNanos() { |
209 |
> |
testParkAfterInterrupt(ParkMethod.parkNanos); |
210 |
> |
} |
211 |
> |
public void testParkAfterInterrupt_parkUntil() { |
212 |
> |
testParkAfterInterrupt(ParkMethod.parkUntil); |
213 |
> |
} |
214 |
> |
public void testParkAfterInterrupt_parkBlocker() { |
215 |
> |
testParkAfterInterrupt(ParkMethod.parkBlocker); |
216 |
|
} |
217 |
+ |
public void testParkAfterInterrupt_parkNanosBlocker() { |
218 |
+ |
testParkAfterInterrupt(ParkMethod.parkNanosBlocker); |
219 |
+ |
} |
220 |
+ |
public void testParkAfterInterrupt_parkUntilBlocker() { |
221 |
+ |
testParkAfterInterrupt(ParkMethod.parkUntilBlocker); |
222 |
+ |
} |
223 |
+ |
public void testParkAfterInterrupt(final ParkMethod parkMethod) { |
224 |
+ |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
225 |
+ |
Thread t = newStartedThread(new CheckedRunnable() { |
226 |
+ |
public void realRun() throws Exception { |
227 |
+ |
pleaseInterrupt.countDown(); |
228 |
+ |
while (!Thread.currentThread().isInterrupted()) |
229 |
+ |
Thread.yield(); |
230 |
+ |
parkMethod.park(); |
231 |
+ |
assertTrue(Thread.interrupted()); |
232 |
+ |
}}); |
233 |
|
|
234 |
+ |
await(pleaseInterrupt); |
235 |
+ |
t.interrupt(); |
236 |
+ |
awaitTermination(t); |
237 |
+ |
} |
238 |
|
|
239 |
|
/** |
240 |
< |
* parkUntil times out if not unparked |
240 |
> |
* timed park times out if not unparked |
241 |
|
*/ |
242 |
< |
public void testParkUntil() { |
243 |
< |
Thread t = new Thread(new Runnable() { |
244 |
< |
public void run() { |
245 |
< |
try { |
246 |
< |
long d = new Date().getTime() + 100; |
247 |
< |
LockSupport.parkUntil(d); |
248 |
< |
} catch(Exception e){ |
249 |
< |
threadUnexpectedException(); |
250 |
< |
} |
251 |
< |
} |
252 |
< |
}); |
253 |
< |
try { |
254 |
< |
t.start(); |
255 |
< |
t.join(); |
256 |
< |
} |
257 |
< |
catch(Exception e) { |
258 |
< |
unexpectedException(); |
242 |
> |
public void testParkTimesOut_parkNanos() { |
243 |
> |
testParkTimesOut(ParkMethod.parkNanos); |
244 |
> |
} |
245 |
> |
public void testParkTimesOut_parkUntil() { |
246 |
> |
testParkTimesOut(ParkMethod.parkUntil); |
247 |
> |
} |
248 |
> |
public void testParkTimesOut_parkNanosBlocker() { |
249 |
> |
testParkTimesOut(ParkMethod.parkNanosBlocker); |
250 |
> |
} |
251 |
> |
public void testParkTimesOut_parkUntilBlocker() { |
252 |
> |
testParkTimesOut(ParkMethod.parkUntilBlocker); |
253 |
> |
} |
254 |
> |
public void testParkTimesOut(final ParkMethod parkMethod) { |
255 |
> |
Thread t = newStartedThread(new CheckedRunnable() { |
256 |
> |
public void realRun() { |
257 |
> |
for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) { |
258 |
> |
long startTime = System.nanoTime(); |
259 |
> |
parkMethod.park(timeoutMillis()); |
260 |
> |
if (millisElapsedSince(startTime) >= timeoutMillis()) |
261 |
> |
return; |
262 |
> |
} |
263 |
> |
fail("too many consecutive spurious wakeups?"); |
264 |
> |
}}); |
265 |
> |
|
266 |
> |
awaitTermination(t); |
267 |
> |
} |
268 |
> |
|
269 |
> |
/** |
270 |
> |
* getBlocker(null) throws NullPointerException |
271 |
> |
*/ |
272 |
> |
public void testGetBlockerNull() { |
273 |
> |
try { |
274 |
> |
LockSupport.getBlocker(null); |
275 |
> |
shouldThrow(); |
276 |
> |
} catch (NullPointerException success) {} |
277 |
> |
} |
278 |
> |
|
279 |
> |
/** |
280 |
> |
* getBlocker returns the blocker object passed to park |
281 |
> |
*/ |
282 |
> |
public void testGetBlocker_parkBlocker() { |
283 |
> |
testGetBlocker(ParkMethod.parkBlocker); |
284 |
> |
} |
285 |
> |
public void testGetBlocker_parkNanosBlocker() { |
286 |
> |
testGetBlocker(ParkMethod.parkNanosBlocker); |
287 |
> |
} |
288 |
> |
public void testGetBlocker_parkUntilBlocker() { |
289 |
> |
testGetBlocker(ParkMethod.parkUntilBlocker); |
290 |
> |
} |
291 |
> |
public void testGetBlocker(final ParkMethod parkMethod) { |
292 |
> |
final CountDownLatch started = new CountDownLatch(1); |
293 |
> |
Thread t = newStartedThread(new CheckedRunnable() { |
294 |
> |
public void realRun() { |
295 |
> |
Thread t = Thread.currentThread(); |
296 |
> |
started.countDown(); |
297 |
> |
for (int tries = MAX_SPURIOUS_WAKEUPS; tries-->0; ) { |
298 |
> |
assertNull(LockSupport.getBlocker(t)); |
299 |
> |
parkMethod.park(); |
300 |
> |
assertNull(LockSupport.getBlocker(t)); |
301 |
> |
if (Thread.interrupted()) |
302 |
> |
return; |
303 |
> |
} |
304 |
> |
fail("too many consecutive spurious wakeups?"); |
305 |
> |
}}); |
306 |
> |
|
307 |
> |
long startTime = System.nanoTime(); |
308 |
> |
await(started); |
309 |
> |
for (;;) { |
310 |
> |
Object x = LockSupport.getBlocker(t); |
311 |
> |
if (x == theBlocker()) { // success |
312 |
> |
t.interrupt(); |
313 |
> |
awaitTermination(t); |
314 |
> |
assertNull(LockSupport.getBlocker(t)); |
315 |
> |
return; |
316 |
> |
} else { |
317 |
> |
assertNull(x); // ok |
318 |
> |
if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
319 |
> |
fail("timed out"); |
320 |
> |
if (t.getState() == Thread.State.TERMINATED) |
321 |
> |
break; |
322 |
> |
Thread.yield(); |
323 |
> |
} |
324 |
|
} |
325 |
|
} |
326 |
+ |
|
327 |
+ |
/** |
328 |
+ |
* timed park(0) returns immediately. |
329 |
+ |
* |
330 |
+ |
* Requires hotspot fix for: |
331 |
+ |
* 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever |
332 |
+ |
* which is in jdk7-b118 and 6u25. |
333 |
+ |
*/ |
334 |
+ |
public void testPark0_parkNanos() { |
335 |
+ |
testPark0(ParkMethod.parkNanos); |
336 |
+ |
} |
337 |
+ |
public void testPark0_parkUntil() { |
338 |
+ |
testPark0(ParkMethod.parkUntil); |
339 |
+ |
} |
340 |
+ |
public void testPark0_parkNanosBlocker() { |
341 |
+ |
testPark0(ParkMethod.parkNanosBlocker); |
342 |
+ |
} |
343 |
+ |
public void testPark0_parkUntilBlocker() { |
344 |
+ |
testPark0(ParkMethod.parkUntilBlocker); |
345 |
+ |
} |
346 |
+ |
public void testPark0(final ParkMethod parkMethod) { |
347 |
+ |
Thread t = newStartedThread(new CheckedRunnable() { |
348 |
+ |
public void realRun() { |
349 |
+ |
parkMethod.park(0L); |
350 |
+ |
}}); |
351 |
+ |
|
352 |
+ |
awaitTermination(t); |
353 |
+ |
} |
354 |
+ |
|
355 |
+ |
/** |
356 |
+ |
* timed park(Long.MIN_VALUE) returns immediately. |
357 |
+ |
*/ |
358 |
+ |
public void testParkNeg_parkNanos() { |
359 |
+ |
testParkNeg(ParkMethod.parkNanos); |
360 |
+ |
} |
361 |
+ |
public void testParkNeg_parkUntil() { |
362 |
+ |
testParkNeg(ParkMethod.parkUntil); |
363 |
+ |
} |
364 |
+ |
public void testParkNeg_parkNanosBlocker() { |
365 |
+ |
testParkNeg(ParkMethod.parkNanosBlocker); |
366 |
+ |
} |
367 |
+ |
public void testParkNeg_parkUntilBlocker() { |
368 |
+ |
testParkNeg(ParkMethod.parkUntilBlocker); |
369 |
+ |
} |
370 |
+ |
public void testParkNeg(final ParkMethod parkMethod) { |
371 |
+ |
Thread t = newStartedThread(new CheckedRunnable() { |
372 |
+ |
public void realRun() { |
373 |
+ |
parkMethod.park(Long.MIN_VALUE); |
374 |
+ |
}}); |
375 |
+ |
|
376 |
+ |
awaitTermination(t); |
377 |
+ |
} |
378 |
|
} |