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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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*/ |
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|
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import junit.framework.*; |
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import java.util.concurrent.locks.*; |
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import java.util.concurrent.*; |
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import java.util.*; |
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import java.io.*; |
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|
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public class ReentrantLockTest 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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public static Test suite() { |
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return new TestSuite(ReentrantLockTest.class); |
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} |
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|
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static int HOLD_COUNT_TEST_LIMIT = 20; |
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|
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class InterruptibleLockRunnable implements Runnable { |
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final ReentrantLock lock; |
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InterruptibleLockRunnable(ReentrantLock l) { lock = l; } |
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public void run(){ |
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try{ |
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lock.lockInterruptibly(); |
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} catch(InterruptedException success){} |
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} |
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} |
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|
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// Same, except must interrupt |
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class InterruptedLockRunnable implements Runnable { |
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final ReentrantLock lock; |
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InterruptedLockRunnable(ReentrantLock l) { lock = l; } |
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public void run(){ |
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try{ |
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lock.lockInterruptibly(); |
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threadFail("should throw"); |
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} catch(InterruptedException success){} |
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} |
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} |
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|
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/** |
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* To expose protected methods |
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*/ |
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static class MyReentrantLock extends ReentrantLock { |
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MyReentrantLock() { super(); } |
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public Collection<Thread> getQueuedThreads() { |
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return super.getQueuedThreads(); |
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} |
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public ConditionObject newCondition() { |
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return new MyCondition(this); |
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} |
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|
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static class MyCondition extends ReentrantLock.ConditionObject { |
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MyCondition(MyReentrantLock l) { super(l); } |
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public Collection<Thread> getWaitingThreads() { |
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return super.getWaitingThreads(); |
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} |
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} |
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|
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} |
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|
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/* |
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* Unlocking an unlocked lock throws IllegalMonitorStateException |
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*/ |
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public void testIllegalMonitorStateException(){ |
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ReentrantLock rl = new ReentrantLock(); |
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try{ |
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rl.unlock(); |
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fail("Should of thown Illegal Monitor State Exception"); |
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|
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} catch(IllegalMonitorStateException success){} |
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} |
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|
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/* |
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* lockInterruptibly is interruptible. |
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*/ |
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public void testInterruptedException(){ |
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final ReentrantLock lock = new ReentrantLock(); |
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lock.lock(); |
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Thread t = new Thread(new InterruptedLockRunnable(lock)); |
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try { |
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t.start(); |
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t.interrupt(); |
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lock.unlock(); |
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t.join(); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
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} |
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} |
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|
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/* |
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* getLockQueueLength reports number of waiting threads |
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*/ |
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public void testgetLockQueueLength(){ |
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final ReentrantLock lock = new ReentrantLock(); |
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Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
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Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
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try { |
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assertEquals(0, lock.getLockQueueLength()); |
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lock.lock(); |
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t1.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(1, lock.getLockQueueLength()); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(2, lock.getLockQueueLength()); |
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t1.interrupt(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(1, lock.getLockQueueLength()); |
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lock.unlock(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(0, lock.getLockQueueLength()); |
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t1.join(); |
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t2.join(); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
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} |
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} |
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|
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/* |
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* getQueuedThreads includes waiting threads |
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*/ |
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public void testGetQueuedThreads(){ |
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final MyReentrantLock lock = new MyReentrantLock(); |
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Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
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Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
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try { |
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assertTrue(lock.getQueuedThreads().isEmpty()); |
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lock.lock(); |
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assertTrue(lock.getQueuedThreads().isEmpty()); |
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t1.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertTrue(lock.getQueuedThreads().contains(t1)); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertTrue(lock.getQueuedThreads().contains(t1)); |
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assertTrue(lock.getQueuedThreads().contains(t2)); |
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t1.interrupt(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertFalse(lock.getQueuedThreads().contains(t1)); |
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assertTrue(lock.getQueuedThreads().contains(t2)); |
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lock.unlock(); |
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Thread.sleep(SHORT_DELAY_MS); |
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assertTrue(lock.getQueuedThreads().isEmpty()); |
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t1.join(); |
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t2.join(); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
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} |
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} |
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|
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|
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/* |
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* timed trylock is interruptible. |
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*/ |
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public void testInterruptedException2(){ |
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final ReentrantLock lock = new ReentrantLock(); |
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lock.lock(); |
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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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lock.tryLock(MEDIUM_DELAY_MS,TimeUnit.MILLISECONDS); |
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threadFail("should throw"); |
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} catch(InterruptedException success){} |
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} |
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}); |
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try { |
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t.start(); |
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t.interrupt(); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
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} |
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} |
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|
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|
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/** |
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* Trylock on a locked lock fails |
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*/ |
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public void testTryLockWhenLocked() { |
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final ReentrantLock lock = new ReentrantLock(); |
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lock.lock(); |
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Thread t = new Thread(new Runnable() { |
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public void run(){ |
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threadAssertFalse(lock.tryLock()); |
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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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lock.unlock(); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
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} |
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} |
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|
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/** |
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* Timed Trylock on a locked lock times out |
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*/ |
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public void testTryLock_Timeout(){ |
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final ReentrantLock lock = new ReentrantLock(); |
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lock.lock(); |
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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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threadAssertFalse(lock.tryLock(1, TimeUnit.MILLISECONDS)); |
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} catch (Exception ex) { |
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threadFail("unexpected exception"); |
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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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lock.unlock(); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
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} |
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} |
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|
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/** |
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* getHoldCount returns number of recursive holds |
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*/ |
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public void testGetHoldCount() { |
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ReentrantLock lock = new ReentrantLock(); |
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for(int i = 1; i <= ReentrantLockTest.HOLD_COUNT_TEST_LIMIT;i++) { |
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lock.lock(); |
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assertEquals(i,lock.getHoldCount()); |
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} |
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for(int i = ReentrantLockTest.HOLD_COUNT_TEST_LIMIT; i > 0; i--) { |
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lock.unlock(); |
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assertEquals(i-1,lock.getHoldCount()); |
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} |
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} |
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|
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|
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/** |
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* isLocked is true when locked and false when not |
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*/ |
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public void testIsLocked() { |
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final ReentrantLock lock = new ReentrantLock(); |
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lock.lock(); |
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assertTrue(lock.isLocked()); |
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lock.unlock(); |
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assertFalse(lock.isLocked()); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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lock.lock(); |
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try { |
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Thread.sleep(SMALL_DELAY_MS); |
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} |
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catch(Exception e) { |
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threadFail("unexpected exception"); |
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} |
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lock.unlock(); |
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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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assertTrue(lock.isLocked()); |
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t.join(); |
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assertFalse(lock.isLocked()); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
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} |
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} |
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|
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|
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/** |
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* lockInterruptibly succeeds when unlocked, else is interruptible |
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*/ |
277 |
public void testLockInterruptibly() { |
278 |
final ReentrantLock lock = new ReentrantLock(); |
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try { |
280 |
lock.lockInterruptibly(); |
281 |
} catch(Exception e) { |
282 |
fail("unexpected exception"); |
283 |
} |
284 |
Thread t = new Thread(new InterruptedLockRunnable(lock)); |
285 |
try { |
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t.start(); |
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t.interrupt(); |
288 |
assertTrue(lock.isLocked()); |
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assertTrue(lock.isHeldByCurrentThread()); |
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t.join(); |
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} catch(Exception e){ |
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fail("unexpected exception"); |
293 |
} |
294 |
} |
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|
296 |
public void testAwait_IllegalMonitor() { |
297 |
final ReentrantLock lock = new ReentrantLock(); |
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final Condition c = lock.newCondition(); |
299 |
try { |
300 |
c.await(); |
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fail("should throw"); |
302 |
} |
303 |
catch (IllegalMonitorStateException success) { |
304 |
} |
305 |
catch (Exception ex) { |
306 |
fail("should throw IMSE"); |
307 |
} |
308 |
} |
309 |
|
310 |
public void testSignal_IllegalMonitor() { |
311 |
final ReentrantLock lock = new ReentrantLock(); |
312 |
final Condition c = lock.newCondition(); |
313 |
try { |
314 |
c.signal(); |
315 |
fail("should throw"); |
316 |
} |
317 |
catch (IllegalMonitorStateException success) { |
318 |
} |
319 |
catch (Exception ex) { |
320 |
fail("should throw IMSE"); |
321 |
} |
322 |
} |
323 |
|
324 |
public void testAwaitNanos_Timeout() { |
325 |
final ReentrantLock lock = new ReentrantLock(); |
326 |
final Condition c = lock.newCondition(); |
327 |
try { |
328 |
lock.lock(); |
329 |
long t = c.awaitNanos(100); |
330 |
assertTrue(t <= 0); |
331 |
lock.unlock(); |
332 |
} |
333 |
catch (Exception ex) { |
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fail("unexpected exception"); |
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} |
336 |
} |
337 |
|
338 |
public void testAwait_Timeout() { |
339 |
final ReentrantLock lock = new ReentrantLock(); |
340 |
final Condition c = lock.newCondition(); |
341 |
try { |
342 |
lock.lock(); |
343 |
assertFalse(c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
344 |
lock.unlock(); |
345 |
} |
346 |
catch (Exception ex) { |
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fail("unexpected exception"); |
348 |
} |
349 |
} |
350 |
|
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public void testAwaitUntil_Timeout() { |
352 |
final ReentrantLock lock = new ReentrantLock(); |
353 |
final Condition c = lock.newCondition(); |
354 |
try { |
355 |
lock.lock(); |
356 |
java.util.Date d = new java.util.Date(); |
357 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
358 |
lock.unlock(); |
359 |
} |
360 |
catch (Exception ex) { |
361 |
fail("unexpected exception"); |
362 |
} |
363 |
} |
364 |
|
365 |
public void testAwait() { |
366 |
final ReentrantLock lock = new ReentrantLock(); |
367 |
final ReentrantLock.ConditionObject c = lock.newCondition(); |
368 |
Thread t = new Thread(new Runnable() { |
369 |
public void run() { |
370 |
try { |
371 |
lock.lock(); |
372 |
c.await(); |
373 |
lock.unlock(); |
374 |
} |
375 |
catch(InterruptedException e) { |
376 |
threadFail("unexpected exception"); |
377 |
} |
378 |
} |
379 |
}); |
380 |
|
381 |
try { |
382 |
t.start(); |
383 |
Thread.sleep(SHORT_DELAY_MS); |
384 |
lock.lock(); |
385 |
c.signal(); |
386 |
lock.unlock(); |
387 |
t.join(SHORT_DELAY_MS); |
388 |
assertFalse(t.isAlive()); |
389 |
} |
390 |
catch (Exception ex) { |
391 |
fail("unexpected exception"); |
392 |
} |
393 |
} |
394 |
|
395 |
public void testHasWaiters() { |
396 |
final ReentrantLock lock = new ReentrantLock(); |
397 |
final ReentrantLock.ConditionObject c = lock.newCondition(); |
398 |
Thread t = new Thread(new Runnable() { |
399 |
public void run() { |
400 |
try { |
401 |
lock.lock(); |
402 |
threadAssertFalse(c.hasWaiters()); |
403 |
threadAssertEquals(0, c.getWaitQueueLength()); |
404 |
c.await(); |
405 |
lock.unlock(); |
406 |
} |
407 |
catch(InterruptedException e) { |
408 |
threadFail("unexpected exception"); |
409 |
} |
410 |
} |
411 |
}); |
412 |
|
413 |
try { |
414 |
t.start(); |
415 |
Thread.sleep(SHORT_DELAY_MS); |
416 |
lock.lock(); |
417 |
assertTrue(c.hasWaiters()); |
418 |
assertEquals(1, c.getWaitQueueLength()); |
419 |
c.signal(); |
420 |
lock.unlock(); |
421 |
Thread.sleep(SHORT_DELAY_MS); |
422 |
lock.lock(); |
423 |
assertFalse(c.hasWaiters()); |
424 |
assertEquals(0, c.getWaitQueueLength()); |
425 |
lock.unlock(); |
426 |
t.join(SHORT_DELAY_MS); |
427 |
assertFalse(t.isAlive()); |
428 |
} |
429 |
catch (Exception ex) { |
430 |
fail("unexpected exception"); |
431 |
} |
432 |
} |
433 |
|
434 |
public void testGetWaitQueueLength() { |
435 |
final ReentrantLock lock = new ReentrantLock(); |
436 |
final ReentrantLock.ConditionObject c = lock.newCondition(); |
437 |
Thread t1 = new Thread(new Runnable() { |
438 |
public void run() { |
439 |
try { |
440 |
lock.lock(); |
441 |
threadAssertFalse(c.hasWaiters()); |
442 |
threadAssertEquals(0, c.getWaitQueueLength()); |
443 |
c.await(); |
444 |
lock.unlock(); |
445 |
} |
446 |
catch(InterruptedException e) { |
447 |
threadFail("unexpected exception"); |
448 |
} |
449 |
} |
450 |
}); |
451 |
|
452 |
Thread t2 = new Thread(new Runnable() { |
453 |
public void run() { |
454 |
try { |
455 |
lock.lock(); |
456 |
threadAssertTrue(c.hasWaiters()); |
457 |
threadAssertEquals(1, c.getWaitQueueLength()); |
458 |
c.await(); |
459 |
lock.unlock(); |
460 |
} |
461 |
catch(InterruptedException e) { |
462 |
threadFail("unexpected exception"); |
463 |
} |
464 |
} |
465 |
}); |
466 |
|
467 |
try { |
468 |
t1.start(); |
469 |
Thread.sleep(SHORT_DELAY_MS); |
470 |
t2.start(); |
471 |
Thread.sleep(SHORT_DELAY_MS); |
472 |
lock.lock(); |
473 |
assertTrue(c.hasWaiters()); |
474 |
assertEquals(2, c.getWaitQueueLength()); |
475 |
c.signalAll(); |
476 |
lock.unlock(); |
477 |
Thread.sleep(SHORT_DELAY_MS); |
478 |
lock.lock(); |
479 |
assertFalse(c.hasWaiters()); |
480 |
assertEquals(0, c.getWaitQueueLength()); |
481 |
lock.unlock(); |
482 |
t1.join(SHORT_DELAY_MS); |
483 |
t2.join(SHORT_DELAY_MS); |
484 |
assertFalse(t1.isAlive()); |
485 |
assertFalse(t2.isAlive()); |
486 |
} |
487 |
catch (Exception ex) { |
488 |
fail("unexpected exception"); |
489 |
} |
490 |
} |
491 |
|
492 |
public void testGetWaitingThreads() { |
493 |
final MyReentrantLock lock = new MyReentrantLock(); |
494 |
final MyReentrantLock.MyCondition c = (MyReentrantLock.MyCondition)lock.newCondition(); |
495 |
Thread t1 = new Thread(new Runnable() { |
496 |
public void run() { |
497 |
try { |
498 |
lock.lock(); |
499 |
threadAssertTrue(c.getWaitingThreads().isEmpty()); |
500 |
c.await(); |
501 |
lock.unlock(); |
502 |
} |
503 |
catch(InterruptedException e) { |
504 |
threadFail("unexpected exception"); |
505 |
} |
506 |
} |
507 |
}); |
508 |
|
509 |
Thread t2 = new Thread(new Runnable() { |
510 |
public void run() { |
511 |
try { |
512 |
lock.lock(); |
513 |
threadAssertFalse(c.getWaitingThreads().isEmpty()); |
514 |
c.await(); |
515 |
lock.unlock(); |
516 |
} |
517 |
catch(InterruptedException e) { |
518 |
threadFail("unexpected exception"); |
519 |
} |
520 |
} |
521 |
}); |
522 |
|
523 |
try { |
524 |
lock.lock(); |
525 |
assertTrue(c.getWaitingThreads().isEmpty()); |
526 |
lock.unlock(); |
527 |
t1.start(); |
528 |
Thread.sleep(SHORT_DELAY_MS); |
529 |
t2.start(); |
530 |
Thread.sleep(SHORT_DELAY_MS); |
531 |
lock.lock(); |
532 |
assertTrue(c.hasWaiters()); |
533 |
assertTrue(c.getWaitingThreads().contains(t1)); |
534 |
assertTrue(c.getWaitingThreads().contains(t2)); |
535 |
c.signalAll(); |
536 |
lock.unlock(); |
537 |
Thread.sleep(SHORT_DELAY_MS); |
538 |
lock.lock(); |
539 |
assertFalse(c.hasWaiters()); |
540 |
assertTrue(c.getWaitingThreads().isEmpty()); |
541 |
lock.unlock(); |
542 |
t1.join(SHORT_DELAY_MS); |
543 |
t2.join(SHORT_DELAY_MS); |
544 |
assertFalse(t1.isAlive()); |
545 |
assertFalse(t2.isAlive()); |
546 |
} |
547 |
catch (Exception ex) { |
548 |
fail("unexpected exception"); |
549 |
} |
550 |
} |
551 |
|
552 |
public void testAwaitUninterruptibly() { |
553 |
final ReentrantLock lock = new ReentrantLock(); |
554 |
final Condition c = lock.newCondition(); |
555 |
Thread t = new Thread(new Runnable() { |
556 |
public void run() { |
557 |
lock.lock(); |
558 |
c.awaitUninterruptibly(); |
559 |
lock.unlock(); |
560 |
} |
561 |
}); |
562 |
|
563 |
try { |
564 |
t.start(); |
565 |
Thread.sleep(SHORT_DELAY_MS); |
566 |
t.interrupt(); |
567 |
lock.lock(); |
568 |
c.signal(); |
569 |
lock.unlock(); |
570 |
t.join(SHORT_DELAY_MS); |
571 |
assertFalse(t.isAlive()); |
572 |
} |
573 |
catch (Exception ex) { |
574 |
fail("unexpected exception"); |
575 |
} |
576 |
} |
577 |
|
578 |
public void testAwait_Interrupt() { |
579 |
final ReentrantLock lock = new ReentrantLock(); |
580 |
final Condition c = lock.newCondition(); |
581 |
Thread t = new Thread(new Runnable() { |
582 |
public void run() { |
583 |
try { |
584 |
lock.lock(); |
585 |
c.await(); |
586 |
lock.unlock(); |
587 |
threadFail("should throw"); |
588 |
} |
589 |
catch(InterruptedException success) { |
590 |
} |
591 |
} |
592 |
}); |
593 |
|
594 |
try { |
595 |
t.start(); |
596 |
Thread.sleep(SHORT_DELAY_MS); |
597 |
t.interrupt(); |
598 |
t.join(SHORT_DELAY_MS); |
599 |
assertFalse(t.isAlive()); |
600 |
} |
601 |
catch (Exception ex) { |
602 |
fail("unexpected exception"); |
603 |
} |
604 |
} |
605 |
|
606 |
public void testAwaitNanos_Interrupt() { |
607 |
final ReentrantLock lock = new ReentrantLock(); |
608 |
final Condition c = lock.newCondition(); |
609 |
Thread t = new Thread(new Runnable() { |
610 |
public void run() { |
611 |
try { |
612 |
lock.lock(); |
613 |
c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000); |
614 |
lock.unlock(); |
615 |
threadFail("should throw"); |
616 |
} |
617 |
catch(InterruptedException success) { |
618 |
} |
619 |
} |
620 |
}); |
621 |
|
622 |
try { |
623 |
t.start(); |
624 |
Thread.sleep(SHORT_DELAY_MS); |
625 |
t.interrupt(); |
626 |
t.join(SHORT_DELAY_MS); |
627 |
assertFalse(t.isAlive()); |
628 |
} |
629 |
catch (Exception ex) { |
630 |
fail("unexpected exception"); |
631 |
} |
632 |
} |
633 |
|
634 |
public void testAwaitUntil_Interrupt() { |
635 |
final ReentrantLock lock = new ReentrantLock(); |
636 |
final Condition c = lock.newCondition(); |
637 |
Thread t = new Thread(new Runnable() { |
638 |
public void run() { |
639 |
try { |
640 |
lock.lock(); |
641 |
java.util.Date d = new java.util.Date(); |
642 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
643 |
lock.unlock(); |
644 |
threadFail("should throw"); |
645 |
} |
646 |
catch(InterruptedException success) { |
647 |
} |
648 |
} |
649 |
}); |
650 |
|
651 |
try { |
652 |
t.start(); |
653 |
Thread.sleep(SHORT_DELAY_MS); |
654 |
t.interrupt(); |
655 |
t.join(SHORT_DELAY_MS); |
656 |
assertFalse(t.isAlive()); |
657 |
} |
658 |
catch (Exception ex) { |
659 |
fail("unexpected exception"); |
660 |
} |
661 |
} |
662 |
|
663 |
public void testSignalAll() { |
664 |
final ReentrantLock lock = new ReentrantLock(); |
665 |
final Condition c = lock.newCondition(); |
666 |
Thread t1 = new Thread(new Runnable() { |
667 |
public void run() { |
668 |
try { |
669 |
lock.lock(); |
670 |
c.await(); |
671 |
lock.unlock(); |
672 |
} |
673 |
catch(InterruptedException e) { |
674 |
threadFail("unexpected exception"); |
675 |
} |
676 |
} |
677 |
}); |
678 |
|
679 |
Thread t2 = new Thread(new Runnable() { |
680 |
public void run() { |
681 |
try { |
682 |
lock.lock(); |
683 |
c.await(); |
684 |
lock.unlock(); |
685 |
} |
686 |
catch(InterruptedException e) { |
687 |
threadFail("unexpected exception"); |
688 |
} |
689 |
} |
690 |
}); |
691 |
|
692 |
try { |
693 |
t1.start(); |
694 |
t2.start(); |
695 |
Thread.sleep(SHORT_DELAY_MS); |
696 |
lock.lock(); |
697 |
c.signalAll(); |
698 |
lock.unlock(); |
699 |
t1.join(SHORT_DELAY_MS); |
700 |
t2.join(SHORT_DELAY_MS); |
701 |
assertFalse(t1.isAlive()); |
702 |
assertFalse(t2.isAlive()); |
703 |
} |
704 |
catch (Exception ex) { |
705 |
fail("unexpected exception"); |
706 |
} |
707 |
} |
708 |
|
709 |
public void testSerialization() { |
710 |
ReentrantLock l = new ReentrantLock(); |
711 |
l.lock(); |
712 |
l.unlock(); |
713 |
|
714 |
try { |
715 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
716 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
717 |
out.writeObject(l); |
718 |
out.close(); |
719 |
|
720 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
721 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
722 |
ReentrantLock r = (ReentrantLock) in.readObject(); |
723 |
r.lock(); |
724 |
r.unlock(); |
725 |
} catch(Exception e){ |
726 |
e.printStackTrace(); |
727 |
fail("unexpected exception"); |
728 |
} |
729 |
} |
730 |
|
731 |
} |