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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/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.concurrent.locks.*; |
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import java.util.concurrent.*; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import java.io.*; |
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import java.util.*; |
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|
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public class ReentrantReadWriteLockTest 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(ReentrantReadWriteLockTest.class); |
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} |
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|
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/** |
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* A runnable calling lockInterruptibly |
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*/ |
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class InterruptibleLockRunnable extends CheckedRunnable { |
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final ReentrantReadWriteLock lock; |
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InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; } |
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public void realRun() throws InterruptedException { |
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lock.writeLock().lockInterruptibly(); |
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} |
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} |
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|
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|
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/** |
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* A runnable calling lockInterruptibly that expects to be |
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* interrupted |
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*/ |
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class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
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final ReentrantReadWriteLock lock; |
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InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; } |
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public void realRun() throws InterruptedException { |
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lock.writeLock().lockInterruptibly(); |
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} |
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} |
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|
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/** |
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* Subclass to expose protected methods |
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*/ |
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static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock { |
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PublicReentrantReadWriteLock() { 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 Collection<Thread> getWaitingThreads(Condition c) { |
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return super.getWaitingThreads(c); |
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} |
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} |
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|
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/** |
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* Releases lock, checking that it had a hold count of 1. |
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*/ |
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void releaseLock(ReentrantReadWriteLock.WriteLock lock) { |
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assertTrue(lock.isHeldByCurrentThread()); |
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lock.unlock(); |
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assertFalse(lock.isHeldByCurrentThread()); |
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} |
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|
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/** |
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* Constructor sets given fairness, and is in unlocked state |
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*/ |
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public void testConstructor() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); |
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assertFalse(rl.isFair()); |
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assertFalse(rl.isWriteLocked()); |
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assertEquals(0, rl.getReadLockCount()); |
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ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true); |
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assertTrue(r2.isFair()); |
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assertFalse(r2.isWriteLocked()); |
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assertEquals(0, r2.getReadLockCount()); |
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ReentrantReadWriteLock r3 = new ReentrantReadWriteLock(false); |
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assertFalse(r3.isFair()); |
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assertFalse(r3.isWriteLocked()); |
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assertEquals(0, r3.getReadLockCount()); |
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} |
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|
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/** |
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* write-locking and read-locking an unlocked lock succeed |
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*/ |
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public void testLock() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); |
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rl.writeLock().lock(); |
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assertTrue(rl.isWriteLocked()); |
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assertTrue(rl.isWriteLockedByCurrentThread()); |
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assertTrue(rl.writeLock().isHeldByCurrentThread()); |
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assertEquals(0, rl.getReadLockCount()); |
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rl.writeLock().unlock(); |
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assertFalse(rl.isWriteLocked()); |
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assertFalse(rl.isWriteLockedByCurrentThread()); |
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assertFalse(rl.writeLock().isHeldByCurrentThread()); |
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assertEquals(0, rl.getReadLockCount()); |
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rl.readLock().lock(); |
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assertFalse(rl.isWriteLocked()); |
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assertFalse(rl.isWriteLockedByCurrentThread()); |
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assertEquals(1, rl.getReadLockCount()); |
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rl.readLock().unlock(); |
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assertFalse(rl.isWriteLocked()); |
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assertFalse(rl.isWriteLockedByCurrentThread()); |
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assertEquals(0, rl.getReadLockCount()); |
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} |
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|
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|
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/** |
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* locking an unlocked fair lock succeeds |
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*/ |
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public void testFairLock() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true); |
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rl.writeLock().lock(); |
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assertTrue(rl.isWriteLocked()); |
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assertTrue(rl.isWriteLockedByCurrentThread()); |
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assertTrue(rl.writeLock().isHeldByCurrentThread()); |
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assertEquals(0, rl.getReadLockCount()); |
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rl.writeLock().unlock(); |
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assertFalse(rl.isWriteLocked()); |
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assertFalse(rl.isWriteLockedByCurrentThread()); |
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assertFalse(rl.writeLock().isHeldByCurrentThread()); |
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assertEquals(0, rl.getReadLockCount()); |
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rl.readLock().lock(); |
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assertFalse(rl.isWriteLocked()); |
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assertFalse(rl.isWriteLockedByCurrentThread()); |
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assertEquals(1, rl.getReadLockCount()); |
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rl.readLock().unlock(); |
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assertFalse(rl.isWriteLocked()); |
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assertFalse(rl.isWriteLockedByCurrentThread()); |
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assertEquals(0, rl.getReadLockCount()); |
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} |
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|
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/** |
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* getWriteHoldCount returns number of recursive holds |
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*/ |
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public void testGetWriteHoldCount() { |
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ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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for (int i = 1; i <= SIZE; i++) { |
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lock.writeLock().lock(); |
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assertEquals(i,lock.getWriteHoldCount()); |
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} |
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for (int i = SIZE; i > 0; i--) { |
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lock.writeLock().unlock(); |
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assertEquals(i-1,lock.getWriteHoldCount()); |
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} |
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} |
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|
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/** |
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* WriteLock.getHoldCount returns number of recursive holds |
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*/ |
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public void testGetHoldCount() { |
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ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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for (int i = 1; i <= SIZE; i++) { |
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lock.writeLock().lock(); |
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assertEquals(i,lock.writeLock().getHoldCount()); |
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} |
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for (int i = SIZE; i > 0; i--) { |
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lock.writeLock().unlock(); |
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assertEquals(i-1,lock.writeLock().getHoldCount()); |
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} |
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} |
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|
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/** |
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* getReadHoldCount returns number of recursive holds |
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*/ |
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public void testGetReadHoldCount() { |
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ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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for (int i = 1; i <= SIZE; i++) { |
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lock.readLock().lock(); |
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assertEquals(i,lock.getReadHoldCount()); |
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} |
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for (int i = SIZE; i > 0; i--) { |
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lock.readLock().unlock(); |
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assertEquals(i-1,lock.getReadHoldCount()); |
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} |
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} |
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|
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|
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/** |
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* write-unlocking an unlocked lock throws IllegalMonitorStateException |
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*/ |
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public void testUnlock_IllegalMonitorStateException() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); |
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try { |
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rl.writeLock().unlock(); |
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shouldThrow(); |
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} catch (IllegalMonitorStateException success) {} |
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} |
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|
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|
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/** |
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* write-lockInterruptibly is interruptible |
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*/ |
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public void testWriteLockInterruptibly_Interrupted() throws Exception { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.writeLock().lockInterruptibly(); |
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}}); |
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|
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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releaseLock(lock.writeLock()); |
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} |
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|
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/** |
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* timed write-tryLock is interruptible |
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*/ |
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public void testWriteTryLock_Interrupted() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.writeLock().tryLock(SMALL_DELAY_MS, MILLISECONDS); |
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}}); |
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|
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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releaseLock(lock.writeLock()); |
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} |
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|
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/** |
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* read-lockInterruptibly is interruptible |
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*/ |
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public void testReadLockInterruptibly_Interrupted() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.readLock().lockInterruptibly(); |
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}}); |
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|
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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Thread.sleep(SHORT_DELAY_MS); |
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lock.writeLock().unlock(); |
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t.join(); |
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} |
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|
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/** |
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* timed read-tryLock is interruptible |
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*/ |
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public void testReadTryLock_Interrupted() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS); |
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}}); |
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|
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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} |
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|
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|
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/** |
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* write-tryLock fails if locked |
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*/ |
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public void testWriteTryLockWhenLocked() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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assertFalse(lock.writeLock().tryLock()); |
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}}); |
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|
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t.join(); |
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lock.writeLock().unlock(); |
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} |
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|
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/** |
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* read-tryLock fails if locked |
283 |
*/ |
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public void testReadTryLockWhenLocked() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedRunnable() { |
288 |
public void realRun() { |
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assertFalse(lock.readLock().tryLock()); |
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}}); |
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|
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t.join(); |
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lock.writeLock().unlock(); |
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} |
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|
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/** |
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* Multiple threads can hold a read lock when not write-locked |
298 |
*/ |
299 |
public void testMultipleReadLocks() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.readLock().lock(); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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assertTrue(lock.readLock().tryLock()); |
305 |
lock.readLock().unlock(); |
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}}); |
307 |
|
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t.join(); |
309 |
lock.readLock().unlock(); |
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} |
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|
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/** |
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* A writelock succeeds after reading threads unlock |
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*/ |
315 |
public void testWriteAfterMultipleReadLocks() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.readLock().lock(); |
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Thread t1 = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
320 |
lock.readLock().lock(); |
321 |
lock.readLock().unlock(); |
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}}); |
323 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
324 |
public void realRun() { |
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lock.writeLock().lock(); |
326 |
lock.writeLock().unlock(); |
327 |
}}); |
328 |
|
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Thread.sleep(SHORT_DELAY_MS); |
330 |
lock.readLock().unlock(); |
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t1.join(MEDIUM_DELAY_MS); |
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t2.join(MEDIUM_DELAY_MS); |
333 |
assertTrue(!t1.isAlive()); |
334 |
assertTrue(!t2.isAlive()); |
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} |
336 |
|
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/** |
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* Readlocks succeed after a writing thread unlocks |
339 |
*/ |
340 |
public void testReadAfterWriteLock() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
342 |
lock.writeLock().lock(); |
343 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
344 |
public void realRun() { |
345 |
lock.readLock().lock(); |
346 |
lock.readLock().unlock(); |
347 |
}}); |
348 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
349 |
public void realRun() { |
350 |
lock.readLock().lock(); |
351 |
lock.readLock().unlock(); |
352 |
}}); |
353 |
|
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Thread.sleep(SHORT_DELAY_MS); |
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lock.writeLock().unlock(); |
356 |
t1.join(MEDIUM_DELAY_MS); |
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t2.join(MEDIUM_DELAY_MS); |
358 |
assertTrue(!t1.isAlive()); |
359 |
assertTrue(!t2.isAlive()); |
360 |
} |
361 |
|
362 |
/** |
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* Read trylock succeeds if write locked by current thread |
364 |
*/ |
365 |
public void testReadHoldingWriteLock() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
367 |
lock.writeLock().lock(); |
368 |
assertTrue(lock.readLock().tryLock()); |
369 |
lock.readLock().unlock(); |
370 |
lock.writeLock().unlock(); |
371 |
} |
372 |
|
373 |
/** |
374 |
* Read lock succeeds if write locked by current thread even if |
375 |
* other threads are waiting for readlock |
376 |
*/ |
377 |
public void testReadHoldingWriteLock2() throws InterruptedException { |
378 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
379 |
lock.writeLock().lock(); |
380 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
381 |
public void realRun() { |
382 |
lock.readLock().lock(); |
383 |
lock.readLock().unlock(); |
384 |
}}); |
385 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
386 |
public void realRun() { |
387 |
lock.readLock().lock(); |
388 |
lock.readLock().unlock(); |
389 |
}}); |
390 |
|
391 |
lock.readLock().lock(); |
392 |
lock.readLock().unlock(); |
393 |
Thread.sleep(SHORT_DELAY_MS); |
394 |
lock.readLock().lock(); |
395 |
lock.readLock().unlock(); |
396 |
lock.writeLock().unlock(); |
397 |
t1.join(MEDIUM_DELAY_MS); |
398 |
t2.join(MEDIUM_DELAY_MS); |
399 |
assertTrue(!t1.isAlive()); |
400 |
assertTrue(!t2.isAlive()); |
401 |
} |
402 |
|
403 |
/** |
404 |
* Read lock succeeds if write locked by current thread even if |
405 |
* other threads are waiting for writelock |
406 |
*/ |
407 |
public void testReadHoldingWriteLock3() throws InterruptedException { |
408 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
409 |
lock.writeLock().lock(); |
410 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
411 |
public void realRun() { |
412 |
lock.writeLock().lock(); |
413 |
lock.writeLock().unlock(); |
414 |
}}); |
415 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
416 |
public void realRun() { |
417 |
lock.writeLock().lock(); |
418 |
lock.writeLock().unlock(); |
419 |
}}); |
420 |
|
421 |
lock.readLock().lock(); |
422 |
lock.readLock().unlock(); |
423 |
Thread.sleep(SHORT_DELAY_MS); |
424 |
lock.readLock().lock(); |
425 |
lock.readLock().unlock(); |
426 |
lock.writeLock().unlock(); |
427 |
t1.join(MEDIUM_DELAY_MS); |
428 |
t2.join(MEDIUM_DELAY_MS); |
429 |
assertTrue(!t1.isAlive()); |
430 |
assertTrue(!t2.isAlive()); |
431 |
} |
432 |
|
433 |
|
434 |
/** |
435 |
* Write lock succeeds if write locked by current thread even if |
436 |
* other threads are waiting for writelock |
437 |
*/ |
438 |
public void testWriteHoldingWriteLock4() throws InterruptedException { |
439 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
440 |
lock.writeLock().lock(); |
441 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
442 |
public void realRun() { |
443 |
lock.writeLock().lock(); |
444 |
lock.writeLock().unlock(); |
445 |
}}); |
446 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
447 |
public void realRun() { |
448 |
lock.writeLock().lock(); |
449 |
lock.writeLock().unlock(); |
450 |
}}); |
451 |
|
452 |
lock.writeLock().lock(); |
453 |
lock.writeLock().unlock(); |
454 |
Thread.sleep(SHORT_DELAY_MS); |
455 |
lock.writeLock().lock(); |
456 |
lock.writeLock().unlock(); |
457 |
lock.writeLock().unlock(); |
458 |
t1.join(MEDIUM_DELAY_MS); |
459 |
t2.join(MEDIUM_DELAY_MS); |
460 |
assertTrue(!t1.isAlive()); |
461 |
assertTrue(!t2.isAlive()); |
462 |
} |
463 |
|
464 |
|
465 |
/** |
466 |
* Fair Read trylock succeeds if write locked by current thread |
467 |
*/ |
468 |
public void testReadHoldingWriteLockFair() { |
469 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
470 |
lock.writeLock().lock(); |
471 |
assertTrue(lock.readLock().tryLock()); |
472 |
lock.readLock().unlock(); |
473 |
lock.writeLock().unlock(); |
474 |
} |
475 |
|
476 |
/** |
477 |
* Fair Read lock succeeds if write locked by current thread even if |
478 |
* other threads are waiting for readlock |
479 |
*/ |
480 |
public void testReadHoldingWriteLockFair2() throws InterruptedException { |
481 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
482 |
lock.writeLock().lock(); |
483 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
484 |
public void realRun() { |
485 |
lock.readLock().lock(); |
486 |
lock.readLock().unlock(); |
487 |
}}); |
488 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
489 |
public void realRun() { |
490 |
lock.readLock().lock(); |
491 |
lock.readLock().unlock(); |
492 |
}}); |
493 |
|
494 |
lock.readLock().lock(); |
495 |
lock.readLock().unlock(); |
496 |
Thread.sleep(SHORT_DELAY_MS); |
497 |
lock.readLock().lock(); |
498 |
lock.readLock().unlock(); |
499 |
lock.writeLock().unlock(); |
500 |
t1.join(MEDIUM_DELAY_MS); |
501 |
t2.join(MEDIUM_DELAY_MS); |
502 |
assertTrue(!t1.isAlive()); |
503 |
assertTrue(!t2.isAlive()); |
504 |
} |
505 |
|
506 |
|
507 |
/** |
508 |
* Fair Read lock succeeds if write locked by current thread even if |
509 |
* other threads are waiting for writelock |
510 |
*/ |
511 |
public void testReadHoldingWriteLockFair3() throws InterruptedException { |
512 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
513 |
lock.writeLock().lock(); |
514 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
515 |
public void realRun() { |
516 |
lock.writeLock().lock(); |
517 |
lock.writeLock().unlock(); |
518 |
}}); |
519 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
520 |
public void realRun() { |
521 |
lock.writeLock().lock(); |
522 |
lock.writeLock().unlock(); |
523 |
}}); |
524 |
|
525 |
lock.readLock().lock(); |
526 |
lock.readLock().unlock(); |
527 |
Thread.sleep(SHORT_DELAY_MS); |
528 |
lock.readLock().lock(); |
529 |
lock.readLock().unlock(); |
530 |
lock.writeLock().unlock(); |
531 |
t1.join(MEDIUM_DELAY_MS); |
532 |
t2.join(MEDIUM_DELAY_MS); |
533 |
assertTrue(!t1.isAlive()); |
534 |
assertTrue(!t2.isAlive()); |
535 |
} |
536 |
|
537 |
|
538 |
/** |
539 |
* Fair Write lock succeeds if write locked by current thread even if |
540 |
* other threads are waiting for writelock |
541 |
*/ |
542 |
public void testWriteHoldingWriteLockFair4() throws InterruptedException { |
543 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
544 |
lock.writeLock().lock(); |
545 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
546 |
public void realRun() { |
547 |
lock.writeLock().lock(); |
548 |
lock.writeLock().unlock(); |
549 |
}}); |
550 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
551 |
public void realRun() { |
552 |
lock.writeLock().lock(); |
553 |
lock.writeLock().unlock(); |
554 |
}}); |
555 |
|
556 |
Thread.sleep(SHORT_DELAY_MS); |
557 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
558 |
assertEquals(1, lock.getWriteHoldCount()); |
559 |
lock.writeLock().lock(); |
560 |
assertEquals(2, lock.getWriteHoldCount()); |
561 |
lock.writeLock().unlock(); |
562 |
lock.writeLock().lock(); |
563 |
lock.writeLock().unlock(); |
564 |
lock.writeLock().unlock(); |
565 |
t1.join(MEDIUM_DELAY_MS); |
566 |
t2.join(MEDIUM_DELAY_MS); |
567 |
assertTrue(!t1.isAlive()); |
568 |
assertTrue(!t2.isAlive()); |
569 |
} |
570 |
|
571 |
|
572 |
/** |
573 |
* Read tryLock succeeds if readlocked but not writelocked |
574 |
*/ |
575 |
public void testTryLockWhenReadLocked() throws InterruptedException { |
576 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
577 |
lock.readLock().lock(); |
578 |
Thread t = newStartedThread(new CheckedRunnable() { |
579 |
public void realRun() { |
580 |
assertTrue(lock.readLock().tryLock()); |
581 |
lock.readLock().unlock(); |
582 |
}}); |
583 |
|
584 |
t.join(); |
585 |
lock.readLock().unlock(); |
586 |
} |
587 |
|
588 |
/** |
589 |
* write tryLock fails when readlocked |
590 |
*/ |
591 |
public void testWriteTryLockWhenReadLocked() throws InterruptedException { |
592 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
593 |
lock.readLock().lock(); |
594 |
Thread t = newStartedThread(new CheckedRunnable() { |
595 |
public void realRun() { |
596 |
assertFalse(lock.writeLock().tryLock()); |
597 |
}}); |
598 |
|
599 |
t.join(); |
600 |
lock.readLock().unlock(); |
601 |
} |
602 |
|
603 |
|
604 |
/** |
605 |
* Fair Read tryLock succeeds if readlocked but not writelocked |
606 |
*/ |
607 |
public void testTryLockWhenReadLockedFair() throws InterruptedException { |
608 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
609 |
lock.readLock().lock(); |
610 |
Thread t = newStartedThread(new CheckedRunnable() { |
611 |
public void realRun() { |
612 |
assertTrue(lock.readLock().tryLock()); |
613 |
lock.readLock().unlock(); |
614 |
}}); |
615 |
|
616 |
t.join(); |
617 |
lock.readLock().unlock(); |
618 |
} |
619 |
|
620 |
|
621 |
|
622 |
/** |
623 |
* Fair write tryLock fails when readlocked |
624 |
*/ |
625 |
public void testWriteTryLockWhenReadLockedFair() throws InterruptedException { |
626 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
627 |
lock.readLock().lock(); |
628 |
Thread t = newStartedThread(new CheckedRunnable() { |
629 |
public void realRun() { |
630 |
assertFalse(lock.writeLock().tryLock()); |
631 |
}}); |
632 |
|
633 |
t.join(); |
634 |
lock.readLock().unlock(); |
635 |
} |
636 |
|
637 |
|
638 |
|
639 |
/** |
640 |
* write timed tryLock times out if locked |
641 |
*/ |
642 |
public void testWriteTryLock_Timeout() throws InterruptedException { |
643 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
644 |
lock.writeLock().lock(); |
645 |
Thread t = newStartedThread(new CheckedRunnable() { |
646 |
public void realRun() throws InterruptedException { |
647 |
assertFalse(lock.writeLock().tryLock(1, MILLISECONDS)); |
648 |
}}); |
649 |
|
650 |
t.join(); |
651 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
652 |
lock.writeLock().unlock(); |
653 |
} |
654 |
|
655 |
/** |
656 |
* read timed tryLock times out if write-locked |
657 |
*/ |
658 |
public void testReadTryLock_Timeout() throws InterruptedException { |
659 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
660 |
lock.writeLock().lock(); |
661 |
Thread t = newStartedThread(new CheckedRunnable() { |
662 |
public void realRun() throws InterruptedException { |
663 |
assertFalse(lock.readLock().tryLock(1, MILLISECONDS)); |
664 |
}}); |
665 |
|
666 |
t.join(); |
667 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
668 |
lock.writeLock().unlock(); |
669 |
} |
670 |
|
671 |
|
672 |
/** |
673 |
* write lockInterruptibly succeeds if lock free else is interruptible |
674 |
*/ |
675 |
public void testWriteLockInterruptibly() throws InterruptedException { |
676 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
677 |
lock.writeLock().lockInterruptibly(); |
678 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
679 |
public void realRun() throws InterruptedException { |
680 |
lock.writeLock().lockInterruptibly(); |
681 |
}}); |
682 |
|
683 |
Thread.sleep(SHORT_DELAY_MS); |
684 |
t.interrupt(); |
685 |
Thread.sleep(SHORT_DELAY_MS); |
686 |
t.join(); |
687 |
lock.writeLock().unlock(); |
688 |
} |
689 |
|
690 |
/** |
691 |
* read lockInterruptibly succeeds if lock free else is interruptible |
692 |
*/ |
693 |
public void testReadLockInterruptibly() throws InterruptedException { |
694 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
695 |
lock.writeLock().lockInterruptibly(); |
696 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
697 |
public void realRun() throws InterruptedException { |
698 |
lock.readLock().lockInterruptibly(); |
699 |
}}); |
700 |
|
701 |
Thread.sleep(SHORT_DELAY_MS); |
702 |
t.interrupt(); |
703 |
t.join(); |
704 |
lock.writeLock().unlock(); |
705 |
} |
706 |
|
707 |
/** |
708 |
* Calling await without holding lock throws IllegalMonitorStateException |
709 |
*/ |
710 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
711 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
712 |
final Condition c = lock.writeLock().newCondition(); |
713 |
try { |
714 |
c.await(); |
715 |
shouldThrow(); |
716 |
} catch (IllegalMonitorStateException success) {} |
717 |
} |
718 |
|
719 |
/** |
720 |
* Calling signal without holding lock throws IllegalMonitorStateException |
721 |
*/ |
722 |
public void testSignal_IllegalMonitor() { |
723 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
724 |
final Condition c = lock.writeLock().newCondition(); |
725 |
try { |
726 |
c.signal(); |
727 |
shouldThrow(); |
728 |
} catch (IllegalMonitorStateException success) {} |
729 |
} |
730 |
|
731 |
/** |
732 |
* awaitNanos without a signal times out |
733 |
*/ |
734 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
735 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
736 |
final Condition c = lock.writeLock().newCondition(); |
737 |
|
738 |
lock.writeLock().lock(); |
739 |
long t = c.awaitNanos(100); |
740 |
assertTrue(t <= 0); |
741 |
lock.writeLock().unlock(); |
742 |
} |
743 |
|
744 |
|
745 |
/** |
746 |
* timed await without a signal times out |
747 |
*/ |
748 |
public void testAwait_Timeout() throws InterruptedException { |
749 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
750 |
final Condition c = lock.writeLock().newCondition(); |
751 |
lock.writeLock().lock(); |
752 |
assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS)); |
753 |
lock.writeLock().unlock(); |
754 |
} |
755 |
|
756 |
/** |
757 |
* awaitUntil without a signal times out |
758 |
*/ |
759 |
public void testAwaitUntil_Timeout() throws InterruptedException { |
760 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
761 |
final Condition c = lock.writeLock().newCondition(); |
762 |
lock.writeLock().lock(); |
763 |
java.util.Date d = new java.util.Date(); |
764 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
765 |
lock.writeLock().unlock(); |
766 |
} |
767 |
|
768 |
/** |
769 |
* await returns when signalled |
770 |
*/ |
771 |
public void testAwait() throws InterruptedException { |
772 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
773 |
final Condition c = lock.writeLock().newCondition(); |
774 |
Thread t = newStartedThread(new CheckedRunnable() { |
775 |
public void realRun() throws InterruptedException { |
776 |
lock.writeLock().lock(); |
777 |
c.await(); |
778 |
lock.writeLock().unlock(); |
779 |
}}); |
780 |
|
781 |
Thread.sleep(SHORT_DELAY_MS); |
782 |
lock.writeLock().lock(); |
783 |
c.signal(); |
784 |
lock.writeLock().unlock(); |
785 |
t.join(SHORT_DELAY_MS); |
786 |
assertFalse(t.isAlive()); |
787 |
} |
788 |
|
789 |
/** A helper class for uninterruptible wait tests */ |
790 |
class UninterruptableThread extends Thread { |
791 |
private Lock lock; |
792 |
private Condition c; |
793 |
|
794 |
public volatile boolean canAwake = false; |
795 |
public volatile boolean interrupted = false; |
796 |
public volatile boolean lockStarted = false; |
797 |
|
798 |
public UninterruptableThread(Lock lock, Condition c) { |
799 |
this.lock = lock; |
800 |
this.c = c; |
801 |
} |
802 |
|
803 |
public synchronized void run() { |
804 |
lock.lock(); |
805 |
lockStarted = true; |
806 |
|
807 |
while (!canAwake) { |
808 |
c.awaitUninterruptibly(); |
809 |
} |
810 |
|
811 |
interrupted = isInterrupted(); |
812 |
lock.unlock(); |
813 |
} |
814 |
} |
815 |
|
816 |
/** |
817 |
* awaitUninterruptibly doesn't abort on interrupt |
818 |
*/ |
819 |
public void testAwaitUninterruptibly() throws InterruptedException { |
820 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
821 |
final Condition c = lock.writeLock().newCondition(); |
822 |
UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c); |
823 |
|
824 |
thread.start(); |
825 |
|
826 |
while (!thread.lockStarted) { |
827 |
Thread.sleep(100); |
828 |
} |
829 |
|
830 |
lock.writeLock().lock(); |
831 |
try { |
832 |
thread.interrupt(); |
833 |
thread.canAwake = true; |
834 |
c.signal(); |
835 |
} finally { |
836 |
lock.writeLock().unlock(); |
837 |
} |
838 |
|
839 |
thread.join(); |
840 |
assertTrue(thread.interrupted); |
841 |
assertFalse(thread.isAlive()); |
842 |
} |
843 |
|
844 |
/** |
845 |
* await is interruptible |
846 |
*/ |
847 |
public void testAwait_Interrupt() throws InterruptedException { |
848 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
849 |
final Condition c = lock.writeLock().newCondition(); |
850 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
851 |
public void realRun() throws InterruptedException { |
852 |
lock.writeLock().lock(); |
853 |
c.await(); |
854 |
lock.writeLock().unlock(); |
855 |
}}); |
856 |
|
857 |
Thread.sleep(SHORT_DELAY_MS); |
858 |
t.interrupt(); |
859 |
t.join(SHORT_DELAY_MS); |
860 |
assertFalse(t.isAlive()); |
861 |
} |
862 |
|
863 |
/** |
864 |
* awaitNanos is interruptible |
865 |
*/ |
866 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
867 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
868 |
final Condition c = lock.writeLock().newCondition(); |
869 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
870 |
public void realRun() throws InterruptedException { |
871 |
lock.writeLock().lock(); |
872 |
c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS)); |
873 |
lock.writeLock().unlock(); |
874 |
}}); |
875 |
|
876 |
Thread.sleep(SHORT_DELAY_MS); |
877 |
t.interrupt(); |
878 |
t.join(SHORT_DELAY_MS); |
879 |
assertFalse(t.isAlive()); |
880 |
} |
881 |
|
882 |
/** |
883 |
* awaitUntil is interruptible |
884 |
*/ |
885 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
886 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
887 |
final Condition c = lock.writeLock().newCondition(); |
888 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
889 |
public void realRun() throws InterruptedException { |
890 |
lock.writeLock().lock(); |
891 |
java.util.Date d = new java.util.Date(); |
892 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
893 |
lock.writeLock().unlock(); |
894 |
}}); |
895 |
|
896 |
Thread.sleep(SHORT_DELAY_MS); |
897 |
t.interrupt(); |
898 |
t.join(SHORT_DELAY_MS); |
899 |
assertFalse(t.isAlive()); |
900 |
} |
901 |
|
902 |
/** |
903 |
* signalAll wakes up all threads |
904 |
*/ |
905 |
public void testSignalAll() throws InterruptedException { |
906 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
907 |
final Condition c = lock.writeLock().newCondition(); |
908 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
909 |
public void realRun() throws InterruptedException { |
910 |
lock.writeLock().lock(); |
911 |
c.await(); |
912 |
lock.writeLock().unlock(); |
913 |
}}); |
914 |
|
915 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
916 |
public void realRun() throws InterruptedException { |
917 |
lock.writeLock().lock(); |
918 |
c.await(); |
919 |
lock.writeLock().unlock(); |
920 |
}}); |
921 |
|
922 |
Thread.sleep(SHORT_DELAY_MS); |
923 |
lock.writeLock().lock(); |
924 |
c.signalAll(); |
925 |
lock.writeLock().unlock(); |
926 |
t1.join(SHORT_DELAY_MS); |
927 |
t2.join(SHORT_DELAY_MS); |
928 |
assertFalse(t1.isAlive()); |
929 |
assertFalse(t2.isAlive()); |
930 |
} |
931 |
|
932 |
/** |
933 |
* A serialized lock deserializes as unlocked |
934 |
*/ |
935 |
public void testSerialization() throws Exception { |
936 |
ReentrantReadWriteLock l = new ReentrantReadWriteLock(); |
937 |
l.readLock().lock(); |
938 |
l.readLock().unlock(); |
939 |
|
940 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
941 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
942 |
out.writeObject(l); |
943 |
out.close(); |
944 |
|
945 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
946 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
947 |
ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject(); |
948 |
r.readLock().lock(); |
949 |
r.readLock().unlock(); |
950 |
} |
951 |
|
952 |
/** |
953 |
* hasQueuedThreads reports whether there are waiting threads |
954 |
*/ |
955 |
public void testhasQueuedThreads() throws InterruptedException { |
956 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
957 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
958 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
959 |
assertFalse(lock.hasQueuedThreads()); |
960 |
lock.writeLock().lock(); |
961 |
t1.start(); |
962 |
Thread.sleep(SHORT_DELAY_MS); |
963 |
assertTrue(lock.hasQueuedThreads()); |
964 |
t2.start(); |
965 |
Thread.sleep(SHORT_DELAY_MS); |
966 |
assertTrue(lock.hasQueuedThreads()); |
967 |
t1.interrupt(); |
968 |
Thread.sleep(SHORT_DELAY_MS); |
969 |
assertTrue(lock.hasQueuedThreads()); |
970 |
lock.writeLock().unlock(); |
971 |
Thread.sleep(SHORT_DELAY_MS); |
972 |
assertFalse(lock.hasQueuedThreads()); |
973 |
t1.join(); |
974 |
t2.join(); |
975 |
} |
976 |
|
977 |
/** |
978 |
* hasQueuedThread(null) throws NPE |
979 |
*/ |
980 |
public void testHasQueuedThreadNPE() { |
981 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
982 |
try { |
983 |
sync.hasQueuedThread(null); |
984 |
shouldThrow(); |
985 |
} catch (NullPointerException success) {} |
986 |
} |
987 |
|
988 |
/** |
989 |
* hasQueuedThread reports whether a thread is queued. |
990 |
*/ |
991 |
public void testHasQueuedThread() throws InterruptedException { |
992 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
993 |
Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
994 |
Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
995 |
assertFalse(sync.hasQueuedThread(t1)); |
996 |
assertFalse(sync.hasQueuedThread(t2)); |
997 |
sync.writeLock().lock(); |
998 |
t1.start(); |
999 |
Thread.sleep(SHORT_DELAY_MS); |
1000 |
assertTrue(sync.hasQueuedThread(t1)); |
1001 |
t2.start(); |
1002 |
Thread.sleep(SHORT_DELAY_MS); |
1003 |
assertTrue(sync.hasQueuedThread(t1)); |
1004 |
assertTrue(sync.hasQueuedThread(t2)); |
1005 |
t1.interrupt(); |
1006 |
Thread.sleep(SHORT_DELAY_MS); |
1007 |
assertFalse(sync.hasQueuedThread(t1)); |
1008 |
assertTrue(sync.hasQueuedThread(t2)); |
1009 |
sync.writeLock().unlock(); |
1010 |
Thread.sleep(SHORT_DELAY_MS); |
1011 |
assertFalse(sync.hasQueuedThread(t1)); |
1012 |
Thread.sleep(SHORT_DELAY_MS); |
1013 |
assertFalse(sync.hasQueuedThread(t2)); |
1014 |
t1.join(); |
1015 |
t2.join(); |
1016 |
} |
1017 |
|
1018 |
|
1019 |
/** |
1020 |
* getQueueLength reports number of waiting threads |
1021 |
*/ |
1022 |
public void testGetQueueLength() throws InterruptedException { |
1023 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1024 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1025 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1026 |
assertEquals(0, lock.getQueueLength()); |
1027 |
lock.writeLock().lock(); |
1028 |
t1.start(); |
1029 |
Thread.sleep(SHORT_DELAY_MS); |
1030 |
assertEquals(1, lock.getQueueLength()); |
1031 |
t2.start(); |
1032 |
Thread.sleep(SHORT_DELAY_MS); |
1033 |
assertEquals(2, lock.getQueueLength()); |
1034 |
t1.interrupt(); |
1035 |
Thread.sleep(SHORT_DELAY_MS); |
1036 |
assertEquals(1, lock.getQueueLength()); |
1037 |
lock.writeLock().unlock(); |
1038 |
Thread.sleep(SHORT_DELAY_MS); |
1039 |
assertEquals(0, lock.getQueueLength()); |
1040 |
t1.join(); |
1041 |
t2.join(); |
1042 |
} |
1043 |
|
1044 |
/** |
1045 |
* getQueuedThreads includes waiting threads |
1046 |
*/ |
1047 |
public void testGetQueuedThreads() throws InterruptedException { |
1048 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1049 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1050 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1051 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1052 |
lock.writeLock().lock(); |
1053 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1054 |
t1.start(); |
1055 |
Thread.sleep(SHORT_DELAY_MS); |
1056 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1057 |
t2.start(); |
1058 |
Thread.sleep(SHORT_DELAY_MS); |
1059 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1060 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1061 |
t1.interrupt(); |
1062 |
Thread.sleep(SHORT_DELAY_MS); |
1063 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
1064 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1065 |
lock.writeLock().unlock(); |
1066 |
Thread.sleep(SHORT_DELAY_MS); |
1067 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1068 |
t1.join(); |
1069 |
t2.join(); |
1070 |
} |
1071 |
|
1072 |
/** |
1073 |
* hasWaiters throws NPE if null |
1074 |
*/ |
1075 |
public void testHasWaitersNPE() { |
1076 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1077 |
try { |
1078 |
lock.hasWaiters(null); |
1079 |
shouldThrow(); |
1080 |
} catch (NullPointerException success) {} |
1081 |
} |
1082 |
|
1083 |
/** |
1084 |
* getWaitQueueLength throws NPE if null |
1085 |
*/ |
1086 |
public void testGetWaitQueueLengthNPE() { |
1087 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1088 |
try { |
1089 |
lock.getWaitQueueLength(null); |
1090 |
shouldThrow(); |
1091 |
} catch (NullPointerException success) {} |
1092 |
} |
1093 |
|
1094 |
|
1095 |
/** |
1096 |
* getWaitingThreads throws NPE if null |
1097 |
*/ |
1098 |
public void testGetWaitingThreadsNPE() { |
1099 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1100 |
try { |
1101 |
lock.getWaitingThreads(null); |
1102 |
shouldThrow(); |
1103 |
} catch (NullPointerException success) {} |
1104 |
} |
1105 |
|
1106 |
/** |
1107 |
* hasWaiters throws IAE if not owned |
1108 |
*/ |
1109 |
public void testHasWaitersIAE() { |
1110 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1111 |
final Condition c = lock.writeLock().newCondition(); |
1112 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1113 |
try { |
1114 |
lock2.hasWaiters(c); |
1115 |
shouldThrow(); |
1116 |
} catch (IllegalArgumentException success) {} |
1117 |
} |
1118 |
|
1119 |
/** |
1120 |
* hasWaiters throws IMSE if not locked |
1121 |
*/ |
1122 |
public void testHasWaitersIMSE() { |
1123 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1124 |
final Condition c = lock.writeLock().newCondition(); |
1125 |
try { |
1126 |
lock.hasWaiters(c); |
1127 |
shouldThrow(); |
1128 |
} catch (IllegalMonitorStateException success) {} |
1129 |
} |
1130 |
|
1131 |
|
1132 |
/** |
1133 |
* getWaitQueueLength throws IAE if not owned |
1134 |
*/ |
1135 |
public void testGetWaitQueueLengthIAE() { |
1136 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1137 |
final Condition c = lock.writeLock().newCondition(); |
1138 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1139 |
try { |
1140 |
lock2.getWaitQueueLength(c); |
1141 |
shouldThrow(); |
1142 |
} catch (IllegalArgumentException success) {} |
1143 |
} |
1144 |
|
1145 |
/** |
1146 |
* getWaitQueueLength throws IMSE if not locked |
1147 |
*/ |
1148 |
public void testGetWaitQueueLengthIMSE() { |
1149 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1150 |
final Condition c = lock.writeLock().newCondition(); |
1151 |
try { |
1152 |
lock.getWaitQueueLength(c); |
1153 |
shouldThrow(); |
1154 |
} catch (IllegalMonitorStateException success) {} |
1155 |
} |
1156 |
|
1157 |
|
1158 |
/** |
1159 |
* getWaitingThreads throws IAE if not owned |
1160 |
*/ |
1161 |
public void testGetWaitingThreadsIAE() { |
1162 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1163 |
final Condition c = lock.writeLock().newCondition(); |
1164 |
final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock(); |
1165 |
try { |
1166 |
lock2.getWaitingThreads(c); |
1167 |
shouldThrow(); |
1168 |
} catch (IllegalArgumentException success) {} |
1169 |
} |
1170 |
|
1171 |
/** |
1172 |
* getWaitingThreads throws IMSE if not locked |
1173 |
*/ |
1174 |
public void testGetWaitingThreadsIMSE() { |
1175 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1176 |
final Condition c = lock.writeLock().newCondition(); |
1177 |
try { |
1178 |
lock.getWaitingThreads(c); |
1179 |
shouldThrow(); |
1180 |
} catch (IllegalMonitorStateException success) {} |
1181 |
} |
1182 |
|
1183 |
|
1184 |
/** |
1185 |
* hasWaiters returns true when a thread is waiting, else false |
1186 |
*/ |
1187 |
public void testHasWaiters() throws InterruptedException { |
1188 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1189 |
final Condition c = lock.writeLock().newCondition(); |
1190 |
Thread t = newStartedThread(new CheckedRunnable() { |
1191 |
public void realRun() throws InterruptedException { |
1192 |
lock.writeLock().lock(); |
1193 |
assertFalse(lock.hasWaiters(c)); |
1194 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1195 |
c.await(); |
1196 |
lock.writeLock().unlock(); |
1197 |
}}); |
1198 |
|
1199 |
Thread.sleep(SHORT_DELAY_MS); |
1200 |
lock.writeLock().lock(); |
1201 |
assertTrue(lock.hasWaiters(c)); |
1202 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1203 |
c.signal(); |
1204 |
lock.writeLock().unlock(); |
1205 |
Thread.sleep(SHORT_DELAY_MS); |
1206 |
lock.writeLock().lock(); |
1207 |
assertFalse(lock.hasWaiters(c)); |
1208 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1209 |
lock.writeLock().unlock(); |
1210 |
t.join(SHORT_DELAY_MS); |
1211 |
assertFalse(t.isAlive()); |
1212 |
} |
1213 |
|
1214 |
/** |
1215 |
* getWaitQueueLength returns number of waiting threads |
1216 |
*/ |
1217 |
public void testGetWaitQueueLength() throws InterruptedException { |
1218 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1219 |
final Condition c = lock.writeLock().newCondition(); |
1220 |
Thread t = newStartedThread(new CheckedRunnable() { |
1221 |
public void realRun() throws InterruptedException { |
1222 |
lock.writeLock().lock(); |
1223 |
assertFalse(lock.hasWaiters(c)); |
1224 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1225 |
c.await(); |
1226 |
lock.writeLock().unlock(); |
1227 |
}}); |
1228 |
|
1229 |
Thread.sleep(SHORT_DELAY_MS); |
1230 |
lock.writeLock().lock(); |
1231 |
assertTrue(lock.hasWaiters(c)); |
1232 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1233 |
c.signal(); |
1234 |
lock.writeLock().unlock(); |
1235 |
Thread.sleep(SHORT_DELAY_MS); |
1236 |
lock.writeLock().lock(); |
1237 |
assertFalse(lock.hasWaiters(c)); |
1238 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1239 |
lock.writeLock().unlock(); |
1240 |
t.join(SHORT_DELAY_MS); |
1241 |
assertFalse(t.isAlive()); |
1242 |
} |
1243 |
|
1244 |
|
1245 |
/** |
1246 |
* getWaitingThreads returns only and all waiting threads |
1247 |
*/ |
1248 |
public void testGetWaitingThreads() throws InterruptedException { |
1249 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1250 |
final Condition c = lock.writeLock().newCondition(); |
1251 |
Thread t1 = new Thread(new CheckedRunnable() { |
1252 |
public void realRun() throws InterruptedException { |
1253 |
lock.writeLock().lock(); |
1254 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1255 |
c.await(); |
1256 |
lock.writeLock().unlock(); |
1257 |
}}); |
1258 |
|
1259 |
Thread t2 = new Thread(new CheckedRunnable() { |
1260 |
public void realRun() throws InterruptedException { |
1261 |
lock.writeLock().lock(); |
1262 |
assertFalse(lock.getWaitingThreads(c).isEmpty()); |
1263 |
c.await(); |
1264 |
lock.writeLock().unlock(); |
1265 |
}}); |
1266 |
|
1267 |
lock.writeLock().lock(); |
1268 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1269 |
lock.writeLock().unlock(); |
1270 |
t1.start(); |
1271 |
Thread.sleep(SHORT_DELAY_MS); |
1272 |
t2.start(); |
1273 |
Thread.sleep(SHORT_DELAY_MS); |
1274 |
lock.writeLock().lock(); |
1275 |
assertTrue(lock.hasWaiters(c)); |
1276 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
1277 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
1278 |
c.signalAll(); |
1279 |
lock.writeLock().unlock(); |
1280 |
Thread.sleep(SHORT_DELAY_MS); |
1281 |
lock.writeLock().lock(); |
1282 |
assertFalse(lock.hasWaiters(c)); |
1283 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1284 |
lock.writeLock().unlock(); |
1285 |
t1.join(SHORT_DELAY_MS); |
1286 |
t2.join(SHORT_DELAY_MS); |
1287 |
assertFalse(t1.isAlive()); |
1288 |
assertFalse(t2.isAlive()); |
1289 |
} |
1290 |
|
1291 |
/** |
1292 |
* toString indicates current lock state |
1293 |
*/ |
1294 |
public void testToString() { |
1295 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1296 |
String us = lock.toString(); |
1297 |
assertTrue(us.indexOf("Write locks = 0") >= 0); |
1298 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1299 |
lock.writeLock().lock(); |
1300 |
String ws = lock.toString(); |
1301 |
assertTrue(ws.indexOf("Write locks = 1") >= 0); |
1302 |
assertTrue(ws.indexOf("Read locks = 0") >= 0); |
1303 |
lock.writeLock().unlock(); |
1304 |
lock.readLock().lock(); |
1305 |
lock.readLock().lock(); |
1306 |
String rs = lock.toString(); |
1307 |
assertTrue(rs.indexOf("Write locks = 0") >= 0); |
1308 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1309 |
} |
1310 |
|
1311 |
/** |
1312 |
* readLock.toString indicates current lock state |
1313 |
*/ |
1314 |
public void testReadLockToString() { |
1315 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1316 |
String us = lock.readLock().toString(); |
1317 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1318 |
lock.readLock().lock(); |
1319 |
lock.readLock().lock(); |
1320 |
String rs = lock.readLock().toString(); |
1321 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1322 |
} |
1323 |
|
1324 |
/** |
1325 |
* writeLock.toString indicates current lock state |
1326 |
*/ |
1327 |
public void testWriteLockToString() { |
1328 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1329 |
String us = lock.writeLock().toString(); |
1330 |
assertTrue(us.indexOf("Unlocked") >= 0); |
1331 |
lock.writeLock().lock(); |
1332 |
String ls = lock.writeLock().toString(); |
1333 |
assertTrue(ls.indexOf("Locked") >= 0); |
1334 |
} |
1335 |
|
1336 |
} |