1 |
/* |
2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
* 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 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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* 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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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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lock.writeLock().lockInterruptibly(); |
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lock.writeLock().unlock(); |
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lock.writeLock().lockInterruptibly(); |
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lock.writeLock().unlock(); |
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} catch (InterruptedException success) {} |
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} |
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}); |
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|
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lock.writeLock().lock(); |
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t.start(); |
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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 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 = new Thread(new Runnable() { |
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public void run() { |
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try { |
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lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS); |
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} catch (InterruptedException success) {} |
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} |
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}); |
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|
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t.start(); |
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t.interrupt(); |
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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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* 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 = new Thread(new Runnable() { |
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public void run() { |
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try { |
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lock.readLock().lockInterruptibly(); |
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} catch (InterruptedException success) {} |
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} |
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}); |
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|
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t.start(); |
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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 = new Thread(new Runnable() { |
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public void run() { |
262 |
try { |
263 |
lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
265 |
} catch (InterruptedException success) {} |
266 |
} |
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}); |
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|
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t.start(); |
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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 |
277 |
*/ |
278 |
public void testWriteTryLockWhenLocked() throws InterruptedException { |
279 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
280 |
lock.writeLock().lock(); |
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Thread t = new Thread(new Runnable() { |
282 |
public void run() { |
283 |
threadAssertFalse(lock.writeLock().tryLock()); |
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} |
285 |
}); |
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|
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t.start(); |
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t.join(); |
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lock.writeLock().unlock(); |
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} |
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|
292 |
/** |
293 |
* read-tryLock fails if locked |
294 |
*/ |
295 |
public void testReadTryLockWhenLocked() throws InterruptedException { |
296 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
297 |
lock.writeLock().lock(); |
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Thread t = new Thread(new Runnable() { |
299 |
public void run() { |
300 |
threadAssertFalse(lock.readLock().tryLock()); |
301 |
} |
302 |
}); |
303 |
|
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t.start(); |
305 |
t.join(); |
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lock.writeLock().unlock(); |
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} |
308 |
|
309 |
/** |
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* Multiple threads can hold a read lock when not write-locked |
311 |
*/ |
312 |
public void testMultipleReadLocks() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
314 |
lock.readLock().lock(); |
315 |
Thread t = new Thread(new Runnable() { |
316 |
public void run() { |
317 |
threadAssertTrue(lock.readLock().tryLock()); |
318 |
lock.readLock().unlock(); |
319 |
} |
320 |
}); |
321 |
|
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t.start(); |
323 |
t.join(); |
324 |
lock.readLock().unlock(); |
325 |
} |
326 |
|
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/** |
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* A writelock succeeds after reading threads unlock |
329 |
*/ |
330 |
public void testWriteAfterMultipleReadLocks() throws InterruptedException { |
331 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
332 |
lock.readLock().lock(); |
333 |
Thread t1 = new Thread(new Runnable() { |
334 |
public void run() { |
335 |
lock.readLock().lock(); |
336 |
lock.readLock().unlock(); |
337 |
} |
338 |
}); |
339 |
Thread t2 = new Thread(new Runnable() { |
340 |
public void run() { |
341 |
lock.writeLock().lock(); |
342 |
lock.writeLock().unlock(); |
343 |
} |
344 |
}); |
345 |
|
346 |
t1.start(); |
347 |
t2.start(); |
348 |
Thread.sleep(SHORT_DELAY_MS); |
349 |
lock.readLock().unlock(); |
350 |
t1.join(MEDIUM_DELAY_MS); |
351 |
t2.join(MEDIUM_DELAY_MS); |
352 |
assertTrue(!t1.isAlive()); |
353 |
assertTrue(!t2.isAlive()); |
354 |
} |
355 |
|
356 |
/** |
357 |
* Readlocks succeed after a writing thread unlocks |
358 |
*/ |
359 |
public void testReadAfterWriteLock() throws InterruptedException { |
360 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
361 |
lock.writeLock().lock(); |
362 |
Thread t1 = new Thread(new Runnable() { |
363 |
public void run() { |
364 |
lock.readLock().lock(); |
365 |
lock.readLock().unlock(); |
366 |
} |
367 |
}); |
368 |
Thread t2 = new Thread(new Runnable() { |
369 |
public void run() { |
370 |
lock.readLock().lock(); |
371 |
lock.readLock().unlock(); |
372 |
} |
373 |
}); |
374 |
|
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t1.start(); |
376 |
t2.start(); |
377 |
Thread.sleep(SHORT_DELAY_MS); |
378 |
lock.writeLock().unlock(); |
379 |
t1.join(MEDIUM_DELAY_MS); |
380 |
t2.join(MEDIUM_DELAY_MS); |
381 |
assertTrue(!t1.isAlive()); |
382 |
assertTrue(!t2.isAlive()); |
383 |
} |
384 |
|
385 |
/** |
386 |
* Read trylock succeeds if write locked by current thread |
387 |
*/ |
388 |
public void testReadHoldingWriteLock() { |
389 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
390 |
lock.writeLock().lock(); |
391 |
assertTrue(lock.readLock().tryLock()); |
392 |
lock.readLock().unlock(); |
393 |
lock.writeLock().unlock(); |
394 |
} |
395 |
|
396 |
/** |
397 |
* Read lock succeeds if write locked by current thread even if |
398 |
* other threads are waiting for readlock |
399 |
*/ |
400 |
public void testReadHoldingWriteLock2() throws InterruptedException { |
401 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
402 |
lock.writeLock().lock(); |
403 |
Thread t1 = new Thread(new Runnable() { |
404 |
public void run() { |
405 |
lock.readLock().lock(); |
406 |
lock.readLock().unlock(); |
407 |
} |
408 |
}); |
409 |
Thread t2 = new Thread(new Runnable() { |
410 |
public void run() { |
411 |
lock.readLock().lock(); |
412 |
lock.readLock().unlock(); |
413 |
} |
414 |
}); |
415 |
|
416 |
t1.start(); |
417 |
t2.start(); |
418 |
lock.readLock().lock(); |
419 |
lock.readLock().unlock(); |
420 |
Thread.sleep(SHORT_DELAY_MS); |
421 |
lock.readLock().lock(); |
422 |
lock.readLock().unlock(); |
423 |
lock.writeLock().unlock(); |
424 |
t1.join(MEDIUM_DELAY_MS); |
425 |
t2.join(MEDIUM_DELAY_MS); |
426 |
assertTrue(!t1.isAlive()); |
427 |
assertTrue(!t2.isAlive()); |
428 |
} |
429 |
|
430 |
/** |
431 |
* Read lock succeeds if write locked by current thread even if |
432 |
* other threads are waiting for writelock |
433 |
*/ |
434 |
public void testReadHoldingWriteLock3() throws InterruptedException { |
435 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
436 |
lock.writeLock().lock(); |
437 |
Thread t1 = new Thread(new Runnable() { |
438 |
public void run() { |
439 |
lock.writeLock().lock(); |
440 |
lock.writeLock().unlock(); |
441 |
} |
442 |
}); |
443 |
Thread t2 = new Thread(new Runnable() { |
444 |
public void run() { |
445 |
lock.writeLock().lock(); |
446 |
lock.writeLock().unlock(); |
447 |
} |
448 |
}); |
449 |
|
450 |
t1.start(); |
451 |
t2.start(); |
452 |
lock.readLock().lock(); |
453 |
lock.readLock().unlock(); |
454 |
Thread.sleep(SHORT_DELAY_MS); |
455 |
lock.readLock().lock(); |
456 |
lock.readLock().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 |
* Write lock succeeds if write locked by current thread even if |
467 |
* other threads are waiting for writelock |
468 |
*/ |
469 |
public void testWriteHoldingWriteLock4() throws InterruptedException { |
470 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
471 |
lock.writeLock().lock(); |
472 |
Thread t1 = new Thread(new Runnable() { |
473 |
public void run() { |
474 |
lock.writeLock().lock(); |
475 |
lock.writeLock().unlock(); |
476 |
} |
477 |
}); |
478 |
Thread t2 = new Thread(new Runnable() { |
479 |
public void run() { |
480 |
lock.writeLock().lock(); |
481 |
lock.writeLock().unlock(); |
482 |
} |
483 |
}); |
484 |
|
485 |
t1.start(); |
486 |
t2.start(); |
487 |
lock.writeLock().lock(); |
488 |
lock.writeLock().unlock(); |
489 |
Thread.sleep(SHORT_DELAY_MS); |
490 |
lock.writeLock().lock(); |
491 |
lock.writeLock().unlock(); |
492 |
lock.writeLock().unlock(); |
493 |
t1.join(MEDIUM_DELAY_MS); |
494 |
t2.join(MEDIUM_DELAY_MS); |
495 |
assertTrue(!t1.isAlive()); |
496 |
assertTrue(!t2.isAlive()); |
497 |
} |
498 |
|
499 |
|
500 |
/** |
501 |
* Fair Read trylock succeeds if write locked by current thread |
502 |
*/ |
503 |
public void testReadHoldingWriteLockFair() { |
504 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
505 |
lock.writeLock().lock(); |
506 |
assertTrue(lock.readLock().tryLock()); |
507 |
lock.readLock().unlock(); |
508 |
lock.writeLock().unlock(); |
509 |
} |
510 |
|
511 |
/** |
512 |
* Fair Read lock succeeds if write locked by current thread even if |
513 |
* other threads are waiting for readlock |
514 |
*/ |
515 |
public void testReadHoldingWriteLockFair2() throws InterruptedException { |
516 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
517 |
lock.writeLock().lock(); |
518 |
Thread t1 = new Thread(new Runnable() { |
519 |
public void run() { |
520 |
lock.readLock().lock(); |
521 |
lock.readLock().unlock(); |
522 |
} |
523 |
}); |
524 |
Thread t2 = new Thread(new Runnable() { |
525 |
public void run() { |
526 |
lock.readLock().lock(); |
527 |
lock.readLock().unlock(); |
528 |
} |
529 |
}); |
530 |
|
531 |
t1.start(); |
532 |
t2.start(); |
533 |
lock.readLock().lock(); |
534 |
lock.readLock().unlock(); |
535 |
Thread.sleep(SHORT_DELAY_MS); |
536 |
lock.readLock().lock(); |
537 |
lock.readLock().unlock(); |
538 |
lock.writeLock().unlock(); |
539 |
t1.join(MEDIUM_DELAY_MS); |
540 |
t2.join(MEDIUM_DELAY_MS); |
541 |
assertTrue(!t1.isAlive()); |
542 |
assertTrue(!t2.isAlive()); |
543 |
} |
544 |
|
545 |
|
546 |
/** |
547 |
* Fair Read lock succeeds if write locked by current thread even if |
548 |
* other threads are waiting for writelock |
549 |
*/ |
550 |
public void testReadHoldingWriteLockFair3() throws InterruptedException { |
551 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
552 |
lock.writeLock().lock(); |
553 |
Thread t1 = new Thread(new Runnable() { |
554 |
public void run() { |
555 |
lock.writeLock().lock(); |
556 |
lock.writeLock().unlock(); |
557 |
} |
558 |
}); |
559 |
Thread t2 = new Thread(new Runnable() { |
560 |
public void run() { |
561 |
lock.writeLock().lock(); |
562 |
lock.writeLock().unlock(); |
563 |
} |
564 |
}); |
565 |
|
566 |
t1.start(); |
567 |
t2.start(); |
568 |
lock.readLock().lock(); |
569 |
lock.readLock().unlock(); |
570 |
Thread.sleep(SHORT_DELAY_MS); |
571 |
lock.readLock().lock(); |
572 |
lock.readLock().unlock(); |
573 |
lock.writeLock().unlock(); |
574 |
t1.join(MEDIUM_DELAY_MS); |
575 |
t2.join(MEDIUM_DELAY_MS); |
576 |
assertTrue(!t1.isAlive()); |
577 |
assertTrue(!t2.isAlive()); |
578 |
} |
579 |
|
580 |
|
581 |
/** |
582 |
* Fair Write lock succeeds if write locked by current thread even if |
583 |
* other threads are waiting for writelock |
584 |
*/ |
585 |
public void testWriteHoldingWriteLockFair4() throws InterruptedException { |
586 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
587 |
lock.writeLock().lock(); |
588 |
Thread t1 = new Thread(new Runnable() { |
589 |
public void run() { |
590 |
lock.writeLock().lock(); |
591 |
lock.writeLock().unlock(); |
592 |
} |
593 |
}); |
594 |
Thread t2 = new Thread(new Runnable() { |
595 |
public void run() { |
596 |
lock.writeLock().lock(); |
597 |
lock.writeLock().unlock(); |
598 |
} |
599 |
}); |
600 |
|
601 |
t1.start(); |
602 |
t2.start(); |
603 |
Thread.sleep(SHORT_DELAY_MS); |
604 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
605 |
assertTrue(lock.getWriteHoldCount() == 1); |
606 |
lock.writeLock().lock(); |
607 |
assertTrue(lock.getWriteHoldCount() == 2); |
608 |
lock.writeLock().unlock(); |
609 |
lock.writeLock().lock(); |
610 |
lock.writeLock().unlock(); |
611 |
lock.writeLock().unlock(); |
612 |
t1.join(MEDIUM_DELAY_MS); |
613 |
t2.join(MEDIUM_DELAY_MS); |
614 |
assertTrue(!t1.isAlive()); |
615 |
assertTrue(!t2.isAlive()); |
616 |
} |
617 |
|
618 |
|
619 |
/** |
620 |
* Read tryLock succeeds if readlocked but not writelocked |
621 |
*/ |
622 |
public void testTryLockWhenReadLocked() throws InterruptedException { |
623 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
624 |
lock.readLock().lock(); |
625 |
Thread t = new Thread(new Runnable() { |
626 |
public void run() { |
627 |
threadAssertTrue(lock.readLock().tryLock()); |
628 |
lock.readLock().unlock(); |
629 |
} |
630 |
}); |
631 |
|
632 |
t.start(); |
633 |
t.join(); |
634 |
lock.readLock().unlock(); |
635 |
} |
636 |
|
637 |
|
638 |
|
639 |
/** |
640 |
* write tryLock fails when readlocked |
641 |
*/ |
642 |
public void testWriteTryLockWhenReadLocked() throws InterruptedException { |
643 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
644 |
lock.readLock().lock(); |
645 |
Thread t = new Thread(new Runnable() { |
646 |
public void run() { |
647 |
threadAssertFalse(lock.writeLock().tryLock()); |
648 |
} |
649 |
}); |
650 |
|
651 |
t.start(); |
652 |
t.join(); |
653 |
lock.readLock().unlock(); |
654 |
} |
655 |
|
656 |
|
657 |
/** |
658 |
* Fair Read tryLock succeeds if readlocked but not writelocked |
659 |
*/ |
660 |
public void testTryLockWhenReadLockedFair() throws InterruptedException { |
661 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
662 |
lock.readLock().lock(); |
663 |
Thread t = new Thread(new Runnable() { |
664 |
public void run() { |
665 |
threadAssertTrue(lock.readLock().tryLock()); |
666 |
lock.readLock().unlock(); |
667 |
} |
668 |
}); |
669 |
|
670 |
t.start(); |
671 |
t.join(); |
672 |
lock.readLock().unlock(); |
673 |
} |
674 |
|
675 |
|
676 |
|
677 |
/** |
678 |
* Fair write tryLock fails when readlocked |
679 |
*/ |
680 |
public void testWriteTryLockWhenReadLockedFair() throws InterruptedException { |
681 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
682 |
lock.readLock().lock(); |
683 |
Thread t = new Thread(new Runnable() { |
684 |
public void run() { |
685 |
threadAssertFalse(lock.writeLock().tryLock()); |
686 |
} |
687 |
}); |
688 |
|
689 |
t.start(); |
690 |
t.join(); |
691 |
lock.readLock().unlock(); |
692 |
} |
693 |
|
694 |
|
695 |
|
696 |
/** |
697 |
* write timed tryLock times out if locked |
698 |
*/ |
699 |
public void testWriteTryLock_Timeout() throws InterruptedException { |
700 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
701 |
lock.writeLock().lock(); |
702 |
Thread t = new Thread(new Runnable() { |
703 |
public void run() { |
704 |
try { |
705 |
threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS)); |
706 |
} catch (Exception ex) { |
707 |
threadUnexpectedException(); |
708 |
} |
709 |
} |
710 |
}); |
711 |
|
712 |
t.start(); |
713 |
t.join(); |
714 |
lock.writeLock().unlock(); |
715 |
} |
716 |
|
717 |
/** |
718 |
* read timed tryLock times out if write-locked |
719 |
*/ |
720 |
public void testReadTryLock_Timeout() throws InterruptedException { |
721 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
722 |
lock.writeLock().lock(); |
723 |
Thread t = new Thread(new Runnable() { |
724 |
public void run() { |
725 |
try { |
726 |
threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS)); |
727 |
} catch (Exception ex) { |
728 |
threadUnexpectedException(); |
729 |
} |
730 |
} |
731 |
}); |
732 |
|
733 |
t.start(); |
734 |
t.join(); |
735 |
lock.writeLock().unlock(); |
736 |
} |
737 |
|
738 |
|
739 |
/** |
740 |
* write lockInterruptibly succeeds if lock free else is interruptible |
741 |
*/ |
742 |
public void testWriteLockInterruptibly() throws InterruptedException { |
743 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
744 |
lock.writeLock().lockInterruptibly(); |
745 |
Thread t = new Thread(new Runnable() { |
746 |
public void run() { |
747 |
try { |
748 |
lock.writeLock().lockInterruptibly(); |
749 |
threadShouldThrow(); |
750 |
} |
751 |
catch (InterruptedException success) { |
752 |
} |
753 |
} |
754 |
}); |
755 |
|
756 |
t.start(); |
757 |
Thread.sleep(SHORT_DELAY_MS); |
758 |
t.interrupt(); |
759 |
Thread.sleep(SHORT_DELAY_MS); |
760 |
t.join(); |
761 |
lock.writeLock().unlock(); |
762 |
} |
763 |
|
764 |
/** |
765 |
* read lockInterruptibly succeeds if lock free else is interruptible |
766 |
*/ |
767 |
public void testReadLockInterruptibly() throws InterruptedException { |
768 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
769 |
lock.writeLock().lockInterruptibly(); |
770 |
Thread t = new Thread(new Runnable() { |
771 |
public void run() { |
772 |
try { |
773 |
lock.readLock().lockInterruptibly(); |
774 |
threadShouldThrow(); |
775 |
} |
776 |
catch (InterruptedException success) { |
777 |
} |
778 |
} |
779 |
}); |
780 |
|
781 |
t.start(); |
782 |
Thread.sleep(SHORT_DELAY_MS); |
783 |
t.interrupt(); |
784 |
t.join(); |
785 |
lock.writeLock().unlock(); |
786 |
} |
787 |
|
788 |
/** |
789 |
* Calling await without holding lock throws IllegalMonitorStateException |
790 |
*/ |
791 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
792 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
793 |
final Condition c = lock.writeLock().newCondition(); |
794 |
try { |
795 |
c.await(); |
796 |
shouldThrow(); |
797 |
} catch (IllegalMonitorStateException success) {} |
798 |
} |
799 |
|
800 |
/** |
801 |
* Calling signal without holding lock throws IllegalMonitorStateException |
802 |
*/ |
803 |
public void testSignal_IllegalMonitor() { |
804 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
805 |
final Condition c = lock.writeLock().newCondition(); |
806 |
try { |
807 |
c.signal(); |
808 |
shouldThrow(); |
809 |
} catch (IllegalMonitorStateException success) {} |
810 |
} |
811 |
|
812 |
/** |
813 |
* awaitNanos without a signal times out |
814 |
*/ |
815 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
816 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
817 |
final Condition c = lock.writeLock().newCondition(); |
818 |
|
819 |
lock.writeLock().lock(); |
820 |
long t = c.awaitNanos(100); |
821 |
assertTrue(t <= 0); |
822 |
lock.writeLock().unlock(); |
823 |
} |
824 |
|
825 |
|
826 |
/** |
827 |
* timed await without a signal times out |
828 |
*/ |
829 |
public void testAwait_Timeout() { |
830 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
831 |
final Condition c = lock.writeLock().newCondition(); |
832 |
lock.writeLock().lock(); |
833 |
lock.writeLock().unlock(); |
834 |
} |
835 |
|
836 |
/** |
837 |
* awaitUntil without a signal times out |
838 |
*/ |
839 |
public void testAwaitUntil_Timeout() { |
840 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
841 |
final Condition c = lock.writeLock().newCondition(); |
842 |
lock.writeLock().lock(); |
843 |
java.util.Date d = new java.util.Date(); |
844 |
lock.writeLock().unlock(); |
845 |
} |
846 |
|
847 |
/** |
848 |
* await returns when signalled |
849 |
*/ |
850 |
public void testAwait() throws InterruptedException { |
851 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
852 |
final Condition c = lock.writeLock().newCondition(); |
853 |
Thread t = new Thread(new Runnable() { |
854 |
public void run() { |
855 |
try { |
856 |
lock.writeLock().lock(); |
857 |
c.await(); |
858 |
lock.writeLock().unlock(); |
859 |
} |
860 |
catch (InterruptedException e) { |
861 |
threadUnexpectedException(); |
862 |
} |
863 |
} |
864 |
}); |
865 |
|
866 |
t.start(); |
867 |
Thread.sleep(SHORT_DELAY_MS); |
868 |
lock.writeLock().lock(); |
869 |
c.signal(); |
870 |
lock.writeLock().unlock(); |
871 |
t.join(SHORT_DELAY_MS); |
872 |
assertFalse(t.isAlive()); |
873 |
} |
874 |
|
875 |
/** A helper class for uninterruptible wait tests */ |
876 |
class UninterruptableThread extends Thread { |
877 |
private Lock lock; |
878 |
private Condition c; |
879 |
|
880 |
public volatile boolean canAwake = false; |
881 |
public volatile boolean interrupted = false; |
882 |
public volatile boolean lockStarted = false; |
883 |
|
884 |
public UninterruptableThread(Lock lock, Condition c) { |
885 |
this.lock = lock; |
886 |
this.c = c; |
887 |
} |
888 |
|
889 |
public synchronized void run() { |
890 |
lock.lock(); |
891 |
lockStarted = true; |
892 |
|
893 |
while (!canAwake) { |
894 |
c.awaitUninterruptibly(); |
895 |
} |
896 |
|
897 |
interrupted = isInterrupted(); |
898 |
lock.unlock(); |
899 |
} |
900 |
} |
901 |
|
902 |
/** |
903 |
* awaitUninterruptibly doesn't abort on interrupt |
904 |
*/ |
905 |
public void testAwaitUninterruptibly() throws InterruptedException { |
906 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
907 |
final Condition c = lock.writeLock().newCondition(); |
908 |
UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c); |
909 |
|
910 |
thread.start(); |
911 |
|
912 |
while (!thread.lockStarted) { |
913 |
Thread.sleep(100); |
914 |
} |
915 |
|
916 |
lock.writeLock().lock(); |
917 |
try { |
918 |
thread.interrupt(); |
919 |
thread.canAwake = true; |
920 |
c.signal(); |
921 |
} finally { |
922 |
lock.writeLock().unlock(); |
923 |
} |
924 |
|
925 |
thread.join(); |
926 |
assertTrue(thread.interrupted); |
927 |
assertFalse(thread.isAlive()); |
928 |
} |
929 |
|
930 |
/** |
931 |
* await is interruptible |
932 |
*/ |
933 |
public void testAwait_Interrupt() throws InterruptedException { |
934 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
935 |
final Condition c = lock.writeLock().newCondition(); |
936 |
Thread t = new Thread(new Runnable() { |
937 |
public void run() { |
938 |
try { |
939 |
lock.writeLock().lock(); |
940 |
c.await(); |
941 |
lock.writeLock().unlock(); |
942 |
threadShouldThrow(); |
943 |
} |
944 |
catch (InterruptedException success) { |
945 |
} |
946 |
} |
947 |
}); |
948 |
|
949 |
t.start(); |
950 |
Thread.sleep(SHORT_DELAY_MS); |
951 |
t.interrupt(); |
952 |
t.join(SHORT_DELAY_MS); |
953 |
assertFalse(t.isAlive()); |
954 |
} |
955 |
|
956 |
/** |
957 |
* awaitNanos is interruptible |
958 |
*/ |
959 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
960 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
961 |
final Condition c = lock.writeLock().newCondition(); |
962 |
Thread t = new Thread(new Runnable() { |
963 |
public void run() { |
964 |
try { |
965 |
lock.writeLock().lock(); |
966 |
c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000); |
967 |
lock.writeLock().unlock(); |
968 |
threadShouldThrow(); |
969 |
} |
970 |
catch (InterruptedException success) { |
971 |
} |
972 |
} |
973 |
}); |
974 |
|
975 |
t.start(); |
976 |
Thread.sleep(SHORT_DELAY_MS); |
977 |
t.interrupt(); |
978 |
t.join(SHORT_DELAY_MS); |
979 |
assertFalse(t.isAlive()); |
980 |
} |
981 |
|
982 |
/** |
983 |
* awaitUntil is interruptible |
984 |
*/ |
985 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
986 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
987 |
final Condition c = lock.writeLock().newCondition(); |
988 |
Thread t = new Thread(new Runnable() { |
989 |
public void run() { |
990 |
try { |
991 |
lock.writeLock().lock(); |
992 |
java.util.Date d = new java.util.Date(); |
993 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
994 |
lock.writeLock().unlock(); |
995 |
threadShouldThrow(); |
996 |
} |
997 |
catch (InterruptedException success) { |
998 |
} |
999 |
} |
1000 |
}); |
1001 |
|
1002 |
t.start(); |
1003 |
Thread.sleep(SHORT_DELAY_MS); |
1004 |
t.interrupt(); |
1005 |
t.join(SHORT_DELAY_MS); |
1006 |
assertFalse(t.isAlive()); |
1007 |
} |
1008 |
|
1009 |
/** |
1010 |
* signalAll wakes up all threads |
1011 |
*/ |
1012 |
public void testSignalAll() throws InterruptedException { |
1013 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1014 |
final Condition c = lock.writeLock().newCondition(); |
1015 |
Thread t1 = new Thread(new Runnable() { |
1016 |
public void run() { |
1017 |
try { |
1018 |
lock.writeLock().lock(); |
1019 |
c.await(); |
1020 |
lock.writeLock().unlock(); |
1021 |
} |
1022 |
catch (InterruptedException e) { |
1023 |
threadUnexpectedException(); |
1024 |
} |
1025 |
} |
1026 |
}); |
1027 |
|
1028 |
Thread t2 = new Thread(new Runnable() { |
1029 |
public void run() { |
1030 |
try { |
1031 |
lock.writeLock().lock(); |
1032 |
c.await(); |
1033 |
lock.writeLock().unlock(); |
1034 |
} |
1035 |
catch (InterruptedException e) { |
1036 |
threadUnexpectedException(); |
1037 |
} |
1038 |
} |
1039 |
}); |
1040 |
|
1041 |
t1.start(); |
1042 |
t2.start(); |
1043 |
Thread.sleep(SHORT_DELAY_MS); |
1044 |
lock.writeLock().lock(); |
1045 |
c.signalAll(); |
1046 |
lock.writeLock().unlock(); |
1047 |
t1.join(SHORT_DELAY_MS); |
1048 |
t2.join(SHORT_DELAY_MS); |
1049 |
assertFalse(t1.isAlive()); |
1050 |
assertFalse(t2.isAlive()); |
1051 |
} |
1052 |
|
1053 |
/** |
1054 |
* A serialized lock deserializes as unlocked |
1055 |
*/ |
1056 |
public void testSerialization() throws Exception { |
1057 |
ReentrantReadWriteLock l = new ReentrantReadWriteLock(); |
1058 |
l.readLock().lock(); |
1059 |
l.readLock().unlock(); |
1060 |
|
1061 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
1062 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
1063 |
out.writeObject(l); |
1064 |
out.close(); |
1065 |
|
1066 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
1067 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
1068 |
ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject(); |
1069 |
r.readLock().lock(); |
1070 |
r.readLock().unlock(); |
1071 |
} |
1072 |
|
1073 |
/** |
1074 |
* hasQueuedThreads reports whether there are waiting threads |
1075 |
*/ |
1076 |
public void testhasQueuedThreads() throws InterruptedException { |
1077 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1078 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1079 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1080 |
assertFalse(lock.hasQueuedThreads()); |
1081 |
lock.writeLock().lock(); |
1082 |
t1.start(); |
1083 |
Thread.sleep(SHORT_DELAY_MS); |
1084 |
assertTrue(lock.hasQueuedThreads()); |
1085 |
t2.start(); |
1086 |
Thread.sleep(SHORT_DELAY_MS); |
1087 |
assertTrue(lock.hasQueuedThreads()); |
1088 |
t1.interrupt(); |
1089 |
Thread.sleep(SHORT_DELAY_MS); |
1090 |
assertTrue(lock.hasQueuedThreads()); |
1091 |
lock.writeLock().unlock(); |
1092 |
Thread.sleep(SHORT_DELAY_MS); |
1093 |
assertFalse(lock.hasQueuedThreads()); |
1094 |
t1.join(); |
1095 |
t2.join(); |
1096 |
} |
1097 |
|
1098 |
/** |
1099 |
* hasQueuedThread(null) throws NPE |
1100 |
*/ |
1101 |
public void testHasQueuedThreadNPE() { |
1102 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
1103 |
try { |
1104 |
sync.hasQueuedThread(null); |
1105 |
shouldThrow(); |
1106 |
} catch (NullPointerException success) { |
1107 |
} |
1108 |
} |
1109 |
|
1110 |
/** |
1111 |
* hasQueuedThread reports whether a thread is queued. |
1112 |
*/ |
1113 |
public void testHasQueuedThread() throws InterruptedException { |
1114 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
1115 |
Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
1116 |
Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
1117 |
assertFalse(sync.hasQueuedThread(t1)); |
1118 |
assertFalse(sync.hasQueuedThread(t2)); |
1119 |
sync.writeLock().lock(); |
1120 |
t1.start(); |
1121 |
Thread.sleep(SHORT_DELAY_MS); |
1122 |
assertTrue(sync.hasQueuedThread(t1)); |
1123 |
t2.start(); |
1124 |
Thread.sleep(SHORT_DELAY_MS); |
1125 |
assertTrue(sync.hasQueuedThread(t1)); |
1126 |
assertTrue(sync.hasQueuedThread(t2)); |
1127 |
t1.interrupt(); |
1128 |
Thread.sleep(SHORT_DELAY_MS); |
1129 |
assertFalse(sync.hasQueuedThread(t1)); |
1130 |
assertTrue(sync.hasQueuedThread(t2)); |
1131 |
sync.writeLock().unlock(); |
1132 |
Thread.sleep(SHORT_DELAY_MS); |
1133 |
assertFalse(sync.hasQueuedThread(t1)); |
1134 |
Thread.sleep(SHORT_DELAY_MS); |
1135 |
assertFalse(sync.hasQueuedThread(t2)); |
1136 |
t1.join(); |
1137 |
t2.join(); |
1138 |
} |
1139 |
|
1140 |
|
1141 |
/** |
1142 |
* getQueueLength reports number of waiting threads |
1143 |
*/ |
1144 |
public void testGetQueueLength() throws InterruptedException { |
1145 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1146 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1147 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1148 |
assertEquals(0, lock.getQueueLength()); |
1149 |
lock.writeLock().lock(); |
1150 |
t1.start(); |
1151 |
Thread.sleep(SHORT_DELAY_MS); |
1152 |
assertEquals(1, lock.getQueueLength()); |
1153 |
t2.start(); |
1154 |
Thread.sleep(SHORT_DELAY_MS); |
1155 |
assertEquals(2, lock.getQueueLength()); |
1156 |
t1.interrupt(); |
1157 |
Thread.sleep(SHORT_DELAY_MS); |
1158 |
assertEquals(1, lock.getQueueLength()); |
1159 |
lock.writeLock().unlock(); |
1160 |
Thread.sleep(SHORT_DELAY_MS); |
1161 |
assertEquals(0, lock.getQueueLength()); |
1162 |
t1.join(); |
1163 |
t2.join(); |
1164 |
} |
1165 |
|
1166 |
/** |
1167 |
* getQueuedThreads includes waiting threads |
1168 |
*/ |
1169 |
public void testGetQueuedThreads() throws InterruptedException { |
1170 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1171 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1172 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1173 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1174 |
lock.writeLock().lock(); |
1175 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1176 |
t1.start(); |
1177 |
Thread.sleep(SHORT_DELAY_MS); |
1178 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1179 |
t2.start(); |
1180 |
Thread.sleep(SHORT_DELAY_MS); |
1181 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1182 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1183 |
t1.interrupt(); |
1184 |
Thread.sleep(SHORT_DELAY_MS); |
1185 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
1186 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1187 |
lock.writeLock().unlock(); |
1188 |
Thread.sleep(SHORT_DELAY_MS); |
1189 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1190 |
t1.join(); |
1191 |
t2.join(); |
1192 |
} |
1193 |
|
1194 |
/** |
1195 |
* hasWaiters throws NPE if null |
1196 |
*/ |
1197 |
public void testHasWaitersNPE() { |
1198 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1199 |
try { |
1200 |
lock.hasWaiters(null); |
1201 |
shouldThrow(); |
1202 |
} catch (NullPointerException success) {} |
1203 |
} |
1204 |
|
1205 |
/** |
1206 |
* getWaitQueueLength throws NPE if null |
1207 |
*/ |
1208 |
public void testGetWaitQueueLengthNPE() { |
1209 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1210 |
try { |
1211 |
lock.getWaitQueueLength(null); |
1212 |
shouldThrow(); |
1213 |
} catch (NullPointerException success) {} |
1214 |
} |
1215 |
|
1216 |
|
1217 |
/** |
1218 |
* getWaitingThreads throws NPE if null |
1219 |
*/ |
1220 |
public void testGetWaitingThreadsNPE() { |
1221 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1222 |
try { |
1223 |
lock.getWaitingThreads(null); |
1224 |
shouldThrow(); |
1225 |
} catch (NullPointerException success) {} |
1226 |
} |
1227 |
|
1228 |
/** |
1229 |
* hasWaiters throws IAE if not owned |
1230 |
*/ |
1231 |
public void testHasWaitersIAE() { |
1232 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1233 |
final Condition c = lock.writeLock().newCondition(); |
1234 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1235 |
try { |
1236 |
lock2.hasWaiters(c); |
1237 |
shouldThrow(); |
1238 |
} catch (IllegalArgumentException success) {} |
1239 |
} |
1240 |
|
1241 |
/** |
1242 |
* hasWaiters throws IMSE if not locked |
1243 |
*/ |
1244 |
public void testHasWaitersIMSE() { |
1245 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1246 |
final Condition c = lock.writeLock().newCondition(); |
1247 |
try { |
1248 |
lock.hasWaiters(c); |
1249 |
shouldThrow(); |
1250 |
} catch (IllegalMonitorStateException success) {} |
1251 |
} |
1252 |
|
1253 |
|
1254 |
/** |
1255 |
* getWaitQueueLength throws IAE if not owned |
1256 |
*/ |
1257 |
public void testGetWaitQueueLengthIAE() { |
1258 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1259 |
final Condition c = lock.writeLock().newCondition(); |
1260 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1261 |
try { |
1262 |
lock2.getWaitQueueLength(c); |
1263 |
shouldThrow(); |
1264 |
} catch (IllegalArgumentException success) {} |
1265 |
} |
1266 |
|
1267 |
/** |
1268 |
* getWaitQueueLength throws IMSE if not locked |
1269 |
*/ |
1270 |
public void testGetWaitQueueLengthIMSE() { |
1271 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1272 |
final Condition c = lock.writeLock().newCondition(); |
1273 |
try { |
1274 |
lock.getWaitQueueLength(c); |
1275 |
shouldThrow(); |
1276 |
} catch (IllegalMonitorStateException success) {} |
1277 |
} |
1278 |
|
1279 |
|
1280 |
/** |
1281 |
* getWaitingThreads throws IAE if not owned |
1282 |
*/ |
1283 |
public void testGetWaitingThreadsIAE() { |
1284 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1285 |
final Condition c = lock.writeLock().newCondition(); |
1286 |
final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock(); |
1287 |
try { |
1288 |
lock2.getWaitingThreads(c); |
1289 |
shouldThrow(); |
1290 |
} catch (IllegalArgumentException success) {} |
1291 |
} |
1292 |
|
1293 |
/** |
1294 |
* getWaitingThreads throws IMSE if not locked |
1295 |
*/ |
1296 |
public void testGetWaitingThreadsIMSE() { |
1297 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1298 |
final Condition c = lock.writeLock().newCondition(); |
1299 |
try { |
1300 |
lock.getWaitingThreads(c); |
1301 |
shouldThrow(); |
1302 |
} catch (IllegalMonitorStateException success) {} |
1303 |
} |
1304 |
|
1305 |
|
1306 |
/** |
1307 |
* hasWaiters returns true when a thread is waiting, else false |
1308 |
*/ |
1309 |
public void testHasWaiters() throws InterruptedException { |
1310 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1311 |
final Condition c = lock.writeLock().newCondition(); |
1312 |
Thread t = new Thread(new Runnable() { |
1313 |
public void run() { |
1314 |
try { |
1315 |
lock.writeLock().lock(); |
1316 |
threadAssertFalse(lock.hasWaiters(c)); |
1317 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
1318 |
c.await(); |
1319 |
lock.writeLock().unlock(); |
1320 |
} |
1321 |
catch (InterruptedException e) { |
1322 |
threadUnexpectedException(); |
1323 |
} |
1324 |
} |
1325 |
}); |
1326 |
|
1327 |
t.start(); |
1328 |
Thread.sleep(SHORT_DELAY_MS); |
1329 |
lock.writeLock().lock(); |
1330 |
assertTrue(lock.hasWaiters(c)); |
1331 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1332 |
c.signal(); |
1333 |
lock.writeLock().unlock(); |
1334 |
Thread.sleep(SHORT_DELAY_MS); |
1335 |
lock.writeLock().lock(); |
1336 |
assertFalse(lock.hasWaiters(c)); |
1337 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1338 |
lock.writeLock().unlock(); |
1339 |
t.join(SHORT_DELAY_MS); |
1340 |
assertFalse(t.isAlive()); |
1341 |
} |
1342 |
|
1343 |
/** |
1344 |
* getWaitQueueLength returns number of waiting threads |
1345 |
*/ |
1346 |
public void testGetWaitQueueLength() throws InterruptedException { |
1347 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1348 |
final Condition c = lock.writeLock().newCondition(); |
1349 |
Thread t = new Thread(new Runnable() { |
1350 |
public void run() { |
1351 |
try { |
1352 |
lock.writeLock().lock(); |
1353 |
threadAssertFalse(lock.hasWaiters(c)); |
1354 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
1355 |
c.await(); |
1356 |
lock.writeLock().unlock(); |
1357 |
} |
1358 |
catch (InterruptedException e) { |
1359 |
threadUnexpectedException(); |
1360 |
} |
1361 |
} |
1362 |
}); |
1363 |
|
1364 |
t.start(); |
1365 |
Thread.sleep(SHORT_DELAY_MS); |
1366 |
lock.writeLock().lock(); |
1367 |
assertTrue(lock.hasWaiters(c)); |
1368 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1369 |
c.signal(); |
1370 |
lock.writeLock().unlock(); |
1371 |
Thread.sleep(SHORT_DELAY_MS); |
1372 |
lock.writeLock().lock(); |
1373 |
assertFalse(lock.hasWaiters(c)); |
1374 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1375 |
lock.writeLock().unlock(); |
1376 |
t.join(SHORT_DELAY_MS); |
1377 |
assertFalse(t.isAlive()); |
1378 |
} |
1379 |
|
1380 |
|
1381 |
/** |
1382 |
* getWaitingThreads returns only and all waiting threads |
1383 |
*/ |
1384 |
public void testGetWaitingThreads() throws InterruptedException { |
1385 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1386 |
final Condition c = lock.writeLock().newCondition(); |
1387 |
Thread t1 = new Thread(new Runnable() { |
1388 |
public void run() { |
1389 |
try { |
1390 |
lock.writeLock().lock(); |
1391 |
threadAssertTrue(lock.getWaitingThreads(c).isEmpty()); |
1392 |
c.await(); |
1393 |
lock.writeLock().unlock(); |
1394 |
} |
1395 |
catch (InterruptedException e) { |
1396 |
threadUnexpectedException(); |
1397 |
} |
1398 |
} |
1399 |
}); |
1400 |
|
1401 |
Thread t2 = new Thread(new Runnable() { |
1402 |
public void run() { |
1403 |
try { |
1404 |
lock.writeLock().lock(); |
1405 |
threadAssertFalse(lock.getWaitingThreads(c).isEmpty()); |
1406 |
c.await(); |
1407 |
lock.writeLock().unlock(); |
1408 |
} |
1409 |
catch (InterruptedException e) { |
1410 |
threadUnexpectedException(); |
1411 |
} |
1412 |
} |
1413 |
}); |
1414 |
|
1415 |
lock.writeLock().lock(); |
1416 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1417 |
lock.writeLock().unlock(); |
1418 |
t1.start(); |
1419 |
Thread.sleep(SHORT_DELAY_MS); |
1420 |
t2.start(); |
1421 |
Thread.sleep(SHORT_DELAY_MS); |
1422 |
lock.writeLock().lock(); |
1423 |
assertTrue(lock.hasWaiters(c)); |
1424 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
1425 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
1426 |
c.signalAll(); |
1427 |
lock.writeLock().unlock(); |
1428 |
Thread.sleep(SHORT_DELAY_MS); |
1429 |
lock.writeLock().lock(); |
1430 |
assertFalse(lock.hasWaiters(c)); |
1431 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1432 |
lock.writeLock().unlock(); |
1433 |
t1.join(SHORT_DELAY_MS); |
1434 |
t2.join(SHORT_DELAY_MS); |
1435 |
assertFalse(t1.isAlive()); |
1436 |
assertFalse(t2.isAlive()); |
1437 |
} |
1438 |
|
1439 |
/** |
1440 |
* toString indicates current lock state |
1441 |
*/ |
1442 |
public void testToString() { |
1443 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1444 |
String us = lock.toString(); |
1445 |
assertTrue(us.indexOf("Write locks = 0") >= 0); |
1446 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1447 |
lock.writeLock().lock(); |
1448 |
String ws = lock.toString(); |
1449 |
assertTrue(ws.indexOf("Write locks = 1") >= 0); |
1450 |
assertTrue(ws.indexOf("Read locks = 0") >= 0); |
1451 |
lock.writeLock().unlock(); |
1452 |
lock.readLock().lock(); |
1453 |
lock.readLock().lock(); |
1454 |
String rs = lock.toString(); |
1455 |
assertTrue(rs.indexOf("Write locks = 0") >= 0); |
1456 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1457 |
} |
1458 |
|
1459 |
/** |
1460 |
* readLock.toString indicates current lock state |
1461 |
*/ |
1462 |
public void testReadLockToString() { |
1463 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1464 |
String us = lock.readLock().toString(); |
1465 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1466 |
lock.readLock().lock(); |
1467 |
lock.readLock().lock(); |
1468 |
String rs = lock.readLock().toString(); |
1469 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1470 |
} |
1471 |
|
1472 |
/** |
1473 |
* writeLock.toString indicates current lock state |
1474 |
*/ |
1475 |
public void testWriteLockToString() { |
1476 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1477 |
String us = lock.writeLock().toString(); |
1478 |
assertTrue(us.indexOf("Unlocked") >= 0); |
1479 |
lock.writeLock().lock(); |
1480 |
String ls = lock.writeLock().toString(); |
1481 |
assertTrue(ls.indexOf("Locked") >= 0); |
1482 |
} |
1483 |
|
1484 |
} |