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/* |
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 |
4 |
* http://creativecommons.org/licenses/publicdomain |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
7 |
*/ |
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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 |
26 |
*/ |
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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(); |
32 |
} |
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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 CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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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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}}); |
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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 CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.writeLock().tryLock(1000,MILLISECONDS); |
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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 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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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 |
248 |
*/ |
249 |
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 CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.readLock().tryLock(1000,MILLISECONDS); |
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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 |
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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 = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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threadAssertFalse(lock.writeLock().tryLock()); |
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}}); |
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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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|
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/** |
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* read-tryLock fails if locked |
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*/ |
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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 = new Thread(new CheckedRunnable() { |
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public void realRun() { |
287 |
threadAssertFalse(lock.readLock().tryLock()); |
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}}); |
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|
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t.start(); |
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t.join(); |
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lock.writeLock().unlock(); |
293 |
} |
294 |
|
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/** |
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* Multiple threads can hold a read lock when not write-locked |
297 |
*/ |
298 |
public void testMultipleReadLocks() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
300 |
lock.readLock().lock(); |
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Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
303 |
threadAssertTrue(lock.readLock().tryLock()); |
304 |
lock.readLock().unlock(); |
305 |
}}); |
306 |
|
307 |
t.start(); |
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t.join(); |
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lock.readLock().unlock(); |
310 |
} |
311 |
|
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/** |
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* A writelock succeeds after reading threads unlock |
314 |
*/ |
315 |
public void testWriteAfterMultipleReadLocks() throws InterruptedException { |
316 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.readLock().lock(); |
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Thread t1 = new Thread(new CheckedRunnable() { |
319 |
public void realRun() { |
320 |
lock.readLock().lock(); |
321 |
lock.readLock().unlock(); |
322 |
}}); |
323 |
Thread t2 = new Thread(new CheckedRunnable() { |
324 |
public void realRun() { |
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lock.writeLock().lock(); |
326 |
lock.writeLock().unlock(); |
327 |
}}); |
328 |
|
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t1.start(); |
330 |
t2.start(); |
331 |
Thread.sleep(SHORT_DELAY_MS); |
332 |
lock.readLock().unlock(); |
333 |
t1.join(MEDIUM_DELAY_MS); |
334 |
t2.join(MEDIUM_DELAY_MS); |
335 |
assertTrue(!t1.isAlive()); |
336 |
assertTrue(!t2.isAlive()); |
337 |
} |
338 |
|
339 |
/** |
340 |
* Readlocks succeed after a writing thread unlocks |
341 |
*/ |
342 |
public void testReadAfterWriteLock() throws InterruptedException { |
343 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
344 |
lock.writeLock().lock(); |
345 |
Thread t1 = new Thread(new CheckedRunnable() { |
346 |
public void realRun() { |
347 |
lock.readLock().lock(); |
348 |
lock.readLock().unlock(); |
349 |
}}); |
350 |
Thread t2 = new Thread(new CheckedRunnable() { |
351 |
public void realRun() { |
352 |
lock.readLock().lock(); |
353 |
lock.readLock().unlock(); |
354 |
}}); |
355 |
|
356 |
t1.start(); |
357 |
t2.start(); |
358 |
Thread.sleep(SHORT_DELAY_MS); |
359 |
lock.writeLock().unlock(); |
360 |
t1.join(MEDIUM_DELAY_MS); |
361 |
t2.join(MEDIUM_DELAY_MS); |
362 |
assertTrue(!t1.isAlive()); |
363 |
assertTrue(!t2.isAlive()); |
364 |
} |
365 |
|
366 |
/** |
367 |
* Read trylock succeeds if write locked by current thread |
368 |
*/ |
369 |
public void testReadHoldingWriteLock() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
371 |
lock.writeLock().lock(); |
372 |
assertTrue(lock.readLock().tryLock()); |
373 |
lock.readLock().unlock(); |
374 |
lock.writeLock().unlock(); |
375 |
} |
376 |
|
377 |
/** |
378 |
* Read lock succeeds if write locked by current thread even if |
379 |
* other threads are waiting for readlock |
380 |
*/ |
381 |
public void testReadHoldingWriteLock2() throws InterruptedException { |
382 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
383 |
lock.writeLock().lock(); |
384 |
Thread t1 = new Thread(new CheckedRunnable() { |
385 |
public void realRun() { |
386 |
lock.readLock().lock(); |
387 |
lock.readLock().unlock(); |
388 |
}}); |
389 |
Thread t2 = new Thread(new CheckedRunnable() { |
390 |
public void realRun() { |
391 |
lock.readLock().lock(); |
392 |
lock.readLock().unlock(); |
393 |
}}); |
394 |
|
395 |
t1.start(); |
396 |
t2.start(); |
397 |
lock.readLock().lock(); |
398 |
lock.readLock().unlock(); |
399 |
Thread.sleep(SHORT_DELAY_MS); |
400 |
lock.readLock().lock(); |
401 |
lock.readLock().unlock(); |
402 |
lock.writeLock().unlock(); |
403 |
t1.join(MEDIUM_DELAY_MS); |
404 |
t2.join(MEDIUM_DELAY_MS); |
405 |
assertTrue(!t1.isAlive()); |
406 |
assertTrue(!t2.isAlive()); |
407 |
} |
408 |
|
409 |
/** |
410 |
* Read lock succeeds if write locked by current thread even if |
411 |
* other threads are waiting for writelock |
412 |
*/ |
413 |
public void testReadHoldingWriteLock3() throws InterruptedException { |
414 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
415 |
lock.writeLock().lock(); |
416 |
Thread t1 = new Thread(new CheckedRunnable() { |
417 |
public void realRun() { |
418 |
lock.writeLock().lock(); |
419 |
lock.writeLock().unlock(); |
420 |
}}); |
421 |
Thread t2 = new Thread(new CheckedRunnable() { |
422 |
public void realRun() { |
423 |
lock.writeLock().lock(); |
424 |
lock.writeLock().unlock(); |
425 |
}}); |
426 |
|
427 |
t1.start(); |
428 |
t2.start(); |
429 |
lock.readLock().lock(); |
430 |
lock.readLock().unlock(); |
431 |
Thread.sleep(SHORT_DELAY_MS); |
432 |
lock.readLock().lock(); |
433 |
lock.readLock().unlock(); |
434 |
lock.writeLock().unlock(); |
435 |
t1.join(MEDIUM_DELAY_MS); |
436 |
t2.join(MEDIUM_DELAY_MS); |
437 |
assertTrue(!t1.isAlive()); |
438 |
assertTrue(!t2.isAlive()); |
439 |
} |
440 |
|
441 |
|
442 |
/** |
443 |
* Write lock succeeds if write locked by current thread even if |
444 |
* other threads are waiting for writelock |
445 |
*/ |
446 |
public void testWriteHoldingWriteLock4() throws InterruptedException { |
447 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
448 |
lock.writeLock().lock(); |
449 |
Thread t1 = new Thread(new CheckedRunnable() { |
450 |
public void realRun() { |
451 |
lock.writeLock().lock(); |
452 |
lock.writeLock().unlock(); |
453 |
}}); |
454 |
Thread t2 = new Thread(new CheckedRunnable() { |
455 |
public void realRun() { |
456 |
lock.writeLock().lock(); |
457 |
lock.writeLock().unlock(); |
458 |
}}); |
459 |
|
460 |
t1.start(); |
461 |
t2.start(); |
462 |
lock.writeLock().lock(); |
463 |
lock.writeLock().unlock(); |
464 |
Thread.sleep(SHORT_DELAY_MS); |
465 |
lock.writeLock().lock(); |
466 |
lock.writeLock().unlock(); |
467 |
lock.writeLock().unlock(); |
468 |
t1.join(MEDIUM_DELAY_MS); |
469 |
t2.join(MEDIUM_DELAY_MS); |
470 |
assertTrue(!t1.isAlive()); |
471 |
assertTrue(!t2.isAlive()); |
472 |
} |
473 |
|
474 |
|
475 |
/** |
476 |
* Fair Read trylock succeeds if write locked by current thread |
477 |
*/ |
478 |
public void testReadHoldingWriteLockFair() { |
479 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
480 |
lock.writeLock().lock(); |
481 |
assertTrue(lock.readLock().tryLock()); |
482 |
lock.readLock().unlock(); |
483 |
lock.writeLock().unlock(); |
484 |
} |
485 |
|
486 |
/** |
487 |
* Fair Read lock succeeds if write locked by current thread even if |
488 |
* other threads are waiting for readlock |
489 |
*/ |
490 |
public void testReadHoldingWriteLockFair2() throws InterruptedException { |
491 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
492 |
lock.writeLock().lock(); |
493 |
Thread t1 = new Thread(new CheckedRunnable() { |
494 |
public void realRun() { |
495 |
lock.readLock().lock(); |
496 |
lock.readLock().unlock(); |
497 |
}}); |
498 |
Thread t2 = new Thread(new CheckedRunnable() { |
499 |
public void realRun() { |
500 |
lock.readLock().lock(); |
501 |
lock.readLock().unlock(); |
502 |
}}); |
503 |
|
504 |
t1.start(); |
505 |
t2.start(); |
506 |
lock.readLock().lock(); |
507 |
lock.readLock().unlock(); |
508 |
Thread.sleep(SHORT_DELAY_MS); |
509 |
lock.readLock().lock(); |
510 |
lock.readLock().unlock(); |
511 |
lock.writeLock().unlock(); |
512 |
t1.join(MEDIUM_DELAY_MS); |
513 |
t2.join(MEDIUM_DELAY_MS); |
514 |
assertTrue(!t1.isAlive()); |
515 |
assertTrue(!t2.isAlive()); |
516 |
} |
517 |
|
518 |
|
519 |
/** |
520 |
* Fair Read lock succeeds if write locked by current thread even if |
521 |
* other threads are waiting for writelock |
522 |
*/ |
523 |
public void testReadHoldingWriteLockFair3() throws InterruptedException { |
524 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
525 |
lock.writeLock().lock(); |
526 |
Thread t1 = new Thread(new CheckedRunnable() { |
527 |
public void realRun() { |
528 |
lock.writeLock().lock(); |
529 |
lock.writeLock().unlock(); |
530 |
}}); |
531 |
Thread t2 = new Thread(new CheckedRunnable() { |
532 |
public void realRun() { |
533 |
lock.writeLock().lock(); |
534 |
lock.writeLock().unlock(); |
535 |
}}); |
536 |
|
537 |
t1.start(); |
538 |
t2.start(); |
539 |
lock.readLock().lock(); |
540 |
lock.readLock().unlock(); |
541 |
Thread.sleep(SHORT_DELAY_MS); |
542 |
lock.readLock().lock(); |
543 |
lock.readLock().unlock(); |
544 |
lock.writeLock().unlock(); |
545 |
t1.join(MEDIUM_DELAY_MS); |
546 |
t2.join(MEDIUM_DELAY_MS); |
547 |
assertTrue(!t1.isAlive()); |
548 |
assertTrue(!t2.isAlive()); |
549 |
} |
550 |
|
551 |
|
552 |
/** |
553 |
* Fair Write lock succeeds if write locked by current thread even if |
554 |
* other threads are waiting for writelock |
555 |
*/ |
556 |
public void testWriteHoldingWriteLockFair4() throws InterruptedException { |
557 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
558 |
lock.writeLock().lock(); |
559 |
Thread t1 = new Thread(new CheckedRunnable() { |
560 |
public void realRun() { |
561 |
lock.writeLock().lock(); |
562 |
lock.writeLock().unlock(); |
563 |
}}); |
564 |
Thread t2 = new Thread(new CheckedRunnable() { |
565 |
public void realRun() { |
566 |
lock.writeLock().lock(); |
567 |
lock.writeLock().unlock(); |
568 |
}}); |
569 |
|
570 |
t1.start(); |
571 |
t2.start(); |
572 |
Thread.sleep(SHORT_DELAY_MS); |
573 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
574 |
assertTrue(lock.getWriteHoldCount() == 1); |
575 |
lock.writeLock().lock(); |
576 |
assertTrue(lock.getWriteHoldCount() == 2); |
577 |
lock.writeLock().unlock(); |
578 |
lock.writeLock().lock(); |
579 |
lock.writeLock().unlock(); |
580 |
lock.writeLock().unlock(); |
581 |
t1.join(MEDIUM_DELAY_MS); |
582 |
t2.join(MEDIUM_DELAY_MS); |
583 |
assertTrue(!t1.isAlive()); |
584 |
assertTrue(!t2.isAlive()); |
585 |
} |
586 |
|
587 |
|
588 |
/** |
589 |
* Read tryLock succeeds if readlocked but not writelocked |
590 |
*/ |
591 |
public void testTryLockWhenReadLocked() throws InterruptedException { |
592 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
593 |
lock.readLock().lock(); |
594 |
Thread t = new Thread(new CheckedRunnable() { |
595 |
public void realRun() { |
596 |
threadAssertTrue(lock.readLock().tryLock()); |
597 |
lock.readLock().unlock(); |
598 |
}}); |
599 |
|
600 |
t.start(); |
601 |
t.join(); |
602 |
lock.readLock().unlock(); |
603 |
} |
604 |
|
605 |
|
606 |
|
607 |
/** |
608 |
* write tryLock fails when readlocked |
609 |
*/ |
610 |
public void testWriteTryLockWhenReadLocked() throws InterruptedException { |
611 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
612 |
lock.readLock().lock(); |
613 |
Thread t = new Thread(new CheckedRunnable() { |
614 |
public void realRun() { |
615 |
threadAssertFalse(lock.writeLock().tryLock()); |
616 |
}}); |
617 |
|
618 |
t.start(); |
619 |
t.join(); |
620 |
lock.readLock().unlock(); |
621 |
} |
622 |
|
623 |
|
624 |
/** |
625 |
* Fair Read tryLock succeeds if readlocked but not writelocked |
626 |
*/ |
627 |
public void testTryLockWhenReadLockedFair() throws InterruptedException { |
628 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
629 |
lock.readLock().lock(); |
630 |
Thread t = new Thread(new CheckedRunnable() { |
631 |
public void realRun() { |
632 |
threadAssertTrue(lock.readLock().tryLock()); |
633 |
lock.readLock().unlock(); |
634 |
}}); |
635 |
|
636 |
t.start(); |
637 |
t.join(); |
638 |
lock.readLock().unlock(); |
639 |
} |
640 |
|
641 |
|
642 |
|
643 |
/** |
644 |
* Fair write tryLock fails when readlocked |
645 |
*/ |
646 |
public void testWriteTryLockWhenReadLockedFair() throws InterruptedException { |
647 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
648 |
lock.readLock().lock(); |
649 |
Thread t = new Thread(new CheckedRunnable() { |
650 |
public void realRun() { |
651 |
threadAssertFalse(lock.writeLock().tryLock()); |
652 |
}}); |
653 |
|
654 |
t.start(); |
655 |
t.join(); |
656 |
lock.readLock().unlock(); |
657 |
} |
658 |
|
659 |
|
660 |
|
661 |
/** |
662 |
* write timed tryLock times out if locked |
663 |
*/ |
664 |
public void testWriteTryLock_Timeout() throws InterruptedException { |
665 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
666 |
lock.writeLock().lock(); |
667 |
Thread t = new Thread(new CheckedRunnable() { |
668 |
public void realRun() throws InterruptedException { |
669 |
threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS)); |
670 |
}}); |
671 |
|
672 |
t.start(); |
673 |
t.join(); |
674 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
675 |
lock.writeLock().unlock(); |
676 |
} |
677 |
|
678 |
/** |
679 |
* read timed tryLock times out if write-locked |
680 |
*/ |
681 |
public void testReadTryLock_Timeout() throws InterruptedException { |
682 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
683 |
lock.writeLock().lock(); |
684 |
Thread t = new Thread(new CheckedRunnable() { |
685 |
public void realRun() throws InterruptedException { |
686 |
threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS)); |
687 |
}}); |
688 |
|
689 |
t.start(); |
690 |
t.join(); |
691 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
692 |
lock.writeLock().unlock(); |
693 |
} |
694 |
|
695 |
|
696 |
/** |
697 |
* write lockInterruptibly succeeds if lock free else is interruptible |
698 |
*/ |
699 |
public void testWriteLockInterruptibly() throws InterruptedException { |
700 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
701 |
lock.writeLock().lockInterruptibly(); |
702 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
703 |
public void realRun() throws InterruptedException { |
704 |
lock.writeLock().lockInterruptibly(); |
705 |
}}); |
706 |
|
707 |
t.start(); |
708 |
Thread.sleep(SHORT_DELAY_MS); |
709 |
t.interrupt(); |
710 |
Thread.sleep(SHORT_DELAY_MS); |
711 |
t.join(); |
712 |
lock.writeLock().unlock(); |
713 |
} |
714 |
|
715 |
/** |
716 |
* read lockInterruptibly succeeds if lock free else is interruptible |
717 |
*/ |
718 |
public void testReadLockInterruptibly() throws InterruptedException { |
719 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
720 |
lock.writeLock().lockInterruptibly(); |
721 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
722 |
public void realRun() throws InterruptedException { |
723 |
lock.readLock().lockInterruptibly(); |
724 |
}}); |
725 |
|
726 |
t.start(); |
727 |
Thread.sleep(SHORT_DELAY_MS); |
728 |
t.interrupt(); |
729 |
t.join(); |
730 |
lock.writeLock().unlock(); |
731 |
} |
732 |
|
733 |
/** |
734 |
* Calling await without holding lock throws IllegalMonitorStateException |
735 |
*/ |
736 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
737 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
738 |
final Condition c = lock.writeLock().newCondition(); |
739 |
try { |
740 |
c.await(); |
741 |
shouldThrow(); |
742 |
} catch (IllegalMonitorStateException success) {} |
743 |
} |
744 |
|
745 |
/** |
746 |
* Calling signal without holding lock throws IllegalMonitorStateException |
747 |
*/ |
748 |
public void testSignal_IllegalMonitor() { |
749 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
750 |
final Condition c = lock.writeLock().newCondition(); |
751 |
try { |
752 |
c.signal(); |
753 |
shouldThrow(); |
754 |
} catch (IllegalMonitorStateException success) {} |
755 |
} |
756 |
|
757 |
/** |
758 |
* awaitNanos without a signal times out |
759 |
*/ |
760 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
761 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
762 |
final Condition c = lock.writeLock().newCondition(); |
763 |
|
764 |
lock.writeLock().lock(); |
765 |
long t = c.awaitNanos(100); |
766 |
assertTrue(t <= 0); |
767 |
lock.writeLock().unlock(); |
768 |
} |
769 |
|
770 |
|
771 |
/** |
772 |
* timed await without a signal times out |
773 |
*/ |
774 |
public void testAwait_Timeout() throws InterruptedException { |
775 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
776 |
final Condition c = lock.writeLock().newCondition(); |
777 |
lock.writeLock().lock(); |
778 |
assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS)); |
779 |
lock.writeLock().unlock(); |
780 |
} |
781 |
|
782 |
/** |
783 |
* awaitUntil without a signal times out |
784 |
*/ |
785 |
public void testAwaitUntil_Timeout() throws InterruptedException { |
786 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
787 |
final Condition c = lock.writeLock().newCondition(); |
788 |
lock.writeLock().lock(); |
789 |
java.util.Date d = new java.util.Date(); |
790 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
791 |
lock.writeLock().unlock(); |
792 |
} |
793 |
|
794 |
/** |
795 |
* await returns when signalled |
796 |
*/ |
797 |
public void testAwait() throws InterruptedException { |
798 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
799 |
final Condition c = lock.writeLock().newCondition(); |
800 |
Thread t = new Thread(new CheckedRunnable() { |
801 |
public void realRun() throws InterruptedException { |
802 |
lock.writeLock().lock(); |
803 |
c.await(); |
804 |
lock.writeLock().unlock(); |
805 |
}}); |
806 |
|
807 |
t.start(); |
808 |
Thread.sleep(SHORT_DELAY_MS); |
809 |
lock.writeLock().lock(); |
810 |
c.signal(); |
811 |
lock.writeLock().unlock(); |
812 |
t.join(SHORT_DELAY_MS); |
813 |
assertFalse(t.isAlive()); |
814 |
} |
815 |
|
816 |
/** A helper class for uninterruptible wait tests */ |
817 |
class UninterruptableThread extends Thread { |
818 |
private Lock lock; |
819 |
private Condition c; |
820 |
|
821 |
public volatile boolean canAwake = false; |
822 |
public volatile boolean interrupted = false; |
823 |
public volatile boolean lockStarted = false; |
824 |
|
825 |
public UninterruptableThread(Lock lock, Condition c) { |
826 |
this.lock = lock; |
827 |
this.c = c; |
828 |
} |
829 |
|
830 |
public synchronized void run() { |
831 |
lock.lock(); |
832 |
lockStarted = true; |
833 |
|
834 |
while (!canAwake) { |
835 |
c.awaitUninterruptibly(); |
836 |
} |
837 |
|
838 |
interrupted = isInterrupted(); |
839 |
lock.unlock(); |
840 |
} |
841 |
} |
842 |
|
843 |
/** |
844 |
* awaitUninterruptibly doesn't abort on interrupt |
845 |
*/ |
846 |
public void testAwaitUninterruptibly() throws InterruptedException { |
847 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
848 |
final Condition c = lock.writeLock().newCondition(); |
849 |
UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c); |
850 |
|
851 |
thread.start(); |
852 |
|
853 |
while (!thread.lockStarted) { |
854 |
Thread.sleep(100); |
855 |
} |
856 |
|
857 |
lock.writeLock().lock(); |
858 |
try { |
859 |
thread.interrupt(); |
860 |
thread.canAwake = true; |
861 |
c.signal(); |
862 |
} finally { |
863 |
lock.writeLock().unlock(); |
864 |
} |
865 |
|
866 |
thread.join(); |
867 |
assertTrue(thread.interrupted); |
868 |
assertFalse(thread.isAlive()); |
869 |
} |
870 |
|
871 |
/** |
872 |
* await is interruptible |
873 |
*/ |
874 |
public void testAwait_Interrupt() throws InterruptedException { |
875 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
876 |
final Condition c = lock.writeLock().newCondition(); |
877 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
878 |
public void realRun() throws InterruptedException { |
879 |
lock.writeLock().lock(); |
880 |
c.await(); |
881 |
lock.writeLock().unlock(); |
882 |
}}); |
883 |
|
884 |
t.start(); |
885 |
Thread.sleep(SHORT_DELAY_MS); |
886 |
t.interrupt(); |
887 |
t.join(SHORT_DELAY_MS); |
888 |
assertFalse(t.isAlive()); |
889 |
} |
890 |
|
891 |
/** |
892 |
* awaitNanos is interruptible |
893 |
*/ |
894 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
895 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
896 |
final Condition c = lock.writeLock().newCondition(); |
897 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
898 |
public void realRun() throws InterruptedException { |
899 |
lock.writeLock().lock(); |
900 |
c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000); |
901 |
lock.writeLock().unlock(); |
902 |
}}); |
903 |
|
904 |
t.start(); |
905 |
Thread.sleep(SHORT_DELAY_MS); |
906 |
t.interrupt(); |
907 |
t.join(SHORT_DELAY_MS); |
908 |
assertFalse(t.isAlive()); |
909 |
} |
910 |
|
911 |
/** |
912 |
* awaitUntil is interruptible |
913 |
*/ |
914 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
915 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
916 |
final Condition c = lock.writeLock().newCondition(); |
917 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
918 |
public void realRun() throws InterruptedException { |
919 |
lock.writeLock().lock(); |
920 |
java.util.Date d = new java.util.Date(); |
921 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
922 |
lock.writeLock().unlock(); |
923 |
}}); |
924 |
|
925 |
t.start(); |
926 |
Thread.sleep(SHORT_DELAY_MS); |
927 |
t.interrupt(); |
928 |
t.join(SHORT_DELAY_MS); |
929 |
assertFalse(t.isAlive()); |
930 |
} |
931 |
|
932 |
/** |
933 |
* signalAll wakes up all threads |
934 |
*/ |
935 |
public void testSignalAll() throws InterruptedException { |
936 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
937 |
final Condition c = lock.writeLock().newCondition(); |
938 |
Thread t1 = new Thread(new CheckedRunnable() { |
939 |
public void realRun() throws InterruptedException { |
940 |
lock.writeLock().lock(); |
941 |
c.await(); |
942 |
lock.writeLock().unlock(); |
943 |
}}); |
944 |
|
945 |
Thread t2 = new Thread(new CheckedRunnable() { |
946 |
public void realRun() throws InterruptedException { |
947 |
lock.writeLock().lock(); |
948 |
c.await(); |
949 |
lock.writeLock().unlock(); |
950 |
}}); |
951 |
|
952 |
t1.start(); |
953 |
t2.start(); |
954 |
Thread.sleep(SHORT_DELAY_MS); |
955 |
lock.writeLock().lock(); |
956 |
c.signalAll(); |
957 |
lock.writeLock().unlock(); |
958 |
t1.join(SHORT_DELAY_MS); |
959 |
t2.join(SHORT_DELAY_MS); |
960 |
assertFalse(t1.isAlive()); |
961 |
assertFalse(t2.isAlive()); |
962 |
} |
963 |
|
964 |
/** |
965 |
* A serialized lock deserializes as unlocked |
966 |
*/ |
967 |
public void testSerialization() throws Exception { |
968 |
ReentrantReadWriteLock l = new ReentrantReadWriteLock(); |
969 |
l.readLock().lock(); |
970 |
l.readLock().unlock(); |
971 |
|
972 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
973 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
974 |
out.writeObject(l); |
975 |
out.close(); |
976 |
|
977 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
978 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
979 |
ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject(); |
980 |
r.readLock().lock(); |
981 |
r.readLock().unlock(); |
982 |
} |
983 |
|
984 |
/** |
985 |
* hasQueuedThreads reports whether there are waiting threads |
986 |
*/ |
987 |
public void testhasQueuedThreads() throws InterruptedException { |
988 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
989 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
990 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
991 |
assertFalse(lock.hasQueuedThreads()); |
992 |
lock.writeLock().lock(); |
993 |
t1.start(); |
994 |
Thread.sleep(SHORT_DELAY_MS); |
995 |
assertTrue(lock.hasQueuedThreads()); |
996 |
t2.start(); |
997 |
Thread.sleep(SHORT_DELAY_MS); |
998 |
assertTrue(lock.hasQueuedThreads()); |
999 |
t1.interrupt(); |
1000 |
Thread.sleep(SHORT_DELAY_MS); |
1001 |
assertTrue(lock.hasQueuedThreads()); |
1002 |
lock.writeLock().unlock(); |
1003 |
Thread.sleep(SHORT_DELAY_MS); |
1004 |
assertFalse(lock.hasQueuedThreads()); |
1005 |
t1.join(); |
1006 |
t2.join(); |
1007 |
} |
1008 |
|
1009 |
/** |
1010 |
* hasQueuedThread(null) throws NPE |
1011 |
*/ |
1012 |
public void testHasQueuedThreadNPE() { |
1013 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
1014 |
try { |
1015 |
sync.hasQueuedThread(null); |
1016 |
shouldThrow(); |
1017 |
} catch (NullPointerException success) {} |
1018 |
} |
1019 |
|
1020 |
/** |
1021 |
* hasQueuedThread reports whether a thread is queued. |
1022 |
*/ |
1023 |
public void testHasQueuedThread() throws InterruptedException { |
1024 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
1025 |
Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
1026 |
Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
1027 |
assertFalse(sync.hasQueuedThread(t1)); |
1028 |
assertFalse(sync.hasQueuedThread(t2)); |
1029 |
sync.writeLock().lock(); |
1030 |
t1.start(); |
1031 |
Thread.sleep(SHORT_DELAY_MS); |
1032 |
assertTrue(sync.hasQueuedThread(t1)); |
1033 |
t2.start(); |
1034 |
Thread.sleep(SHORT_DELAY_MS); |
1035 |
assertTrue(sync.hasQueuedThread(t1)); |
1036 |
assertTrue(sync.hasQueuedThread(t2)); |
1037 |
t1.interrupt(); |
1038 |
Thread.sleep(SHORT_DELAY_MS); |
1039 |
assertFalse(sync.hasQueuedThread(t1)); |
1040 |
assertTrue(sync.hasQueuedThread(t2)); |
1041 |
sync.writeLock().unlock(); |
1042 |
Thread.sleep(SHORT_DELAY_MS); |
1043 |
assertFalse(sync.hasQueuedThread(t1)); |
1044 |
Thread.sleep(SHORT_DELAY_MS); |
1045 |
assertFalse(sync.hasQueuedThread(t2)); |
1046 |
t1.join(); |
1047 |
t2.join(); |
1048 |
} |
1049 |
|
1050 |
|
1051 |
/** |
1052 |
* getQueueLength reports number of waiting threads |
1053 |
*/ |
1054 |
public void testGetQueueLength() throws InterruptedException { |
1055 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1056 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1057 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1058 |
assertEquals(0, lock.getQueueLength()); |
1059 |
lock.writeLock().lock(); |
1060 |
t1.start(); |
1061 |
Thread.sleep(SHORT_DELAY_MS); |
1062 |
assertEquals(1, lock.getQueueLength()); |
1063 |
t2.start(); |
1064 |
Thread.sleep(SHORT_DELAY_MS); |
1065 |
assertEquals(2, lock.getQueueLength()); |
1066 |
t1.interrupt(); |
1067 |
Thread.sleep(SHORT_DELAY_MS); |
1068 |
assertEquals(1, lock.getQueueLength()); |
1069 |
lock.writeLock().unlock(); |
1070 |
Thread.sleep(SHORT_DELAY_MS); |
1071 |
assertEquals(0, lock.getQueueLength()); |
1072 |
t1.join(); |
1073 |
t2.join(); |
1074 |
} |
1075 |
|
1076 |
/** |
1077 |
* getQueuedThreads includes waiting threads |
1078 |
*/ |
1079 |
public void testGetQueuedThreads() throws InterruptedException { |
1080 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1081 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1082 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1083 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1084 |
lock.writeLock().lock(); |
1085 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1086 |
t1.start(); |
1087 |
Thread.sleep(SHORT_DELAY_MS); |
1088 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1089 |
t2.start(); |
1090 |
Thread.sleep(SHORT_DELAY_MS); |
1091 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1092 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1093 |
t1.interrupt(); |
1094 |
Thread.sleep(SHORT_DELAY_MS); |
1095 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
1096 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1097 |
lock.writeLock().unlock(); |
1098 |
Thread.sleep(SHORT_DELAY_MS); |
1099 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1100 |
t1.join(); |
1101 |
t2.join(); |
1102 |
} |
1103 |
|
1104 |
/** |
1105 |
* hasWaiters throws NPE if null |
1106 |
*/ |
1107 |
public void testHasWaitersNPE() { |
1108 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1109 |
try { |
1110 |
lock.hasWaiters(null); |
1111 |
shouldThrow(); |
1112 |
} catch (NullPointerException success) {} |
1113 |
} |
1114 |
|
1115 |
/** |
1116 |
* getWaitQueueLength throws NPE if null |
1117 |
*/ |
1118 |
public void testGetWaitQueueLengthNPE() { |
1119 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1120 |
try { |
1121 |
lock.getWaitQueueLength(null); |
1122 |
shouldThrow(); |
1123 |
} catch (NullPointerException success) {} |
1124 |
} |
1125 |
|
1126 |
|
1127 |
/** |
1128 |
* getWaitingThreads throws NPE if null |
1129 |
*/ |
1130 |
public void testGetWaitingThreadsNPE() { |
1131 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1132 |
try { |
1133 |
lock.getWaitingThreads(null); |
1134 |
shouldThrow(); |
1135 |
} catch (NullPointerException success) {} |
1136 |
} |
1137 |
|
1138 |
/** |
1139 |
* hasWaiters throws IAE if not owned |
1140 |
*/ |
1141 |
public void testHasWaitersIAE() { |
1142 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1143 |
final Condition c = lock.writeLock().newCondition(); |
1144 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1145 |
try { |
1146 |
lock2.hasWaiters(c); |
1147 |
shouldThrow(); |
1148 |
} catch (IllegalArgumentException success) {} |
1149 |
} |
1150 |
|
1151 |
/** |
1152 |
* hasWaiters throws IMSE if not locked |
1153 |
*/ |
1154 |
public void testHasWaitersIMSE() { |
1155 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1156 |
final Condition c = lock.writeLock().newCondition(); |
1157 |
try { |
1158 |
lock.hasWaiters(c); |
1159 |
shouldThrow(); |
1160 |
} catch (IllegalMonitorStateException success) {} |
1161 |
} |
1162 |
|
1163 |
|
1164 |
/** |
1165 |
* getWaitQueueLength throws IAE if not owned |
1166 |
*/ |
1167 |
public void testGetWaitQueueLengthIAE() { |
1168 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1169 |
final Condition c = lock.writeLock().newCondition(); |
1170 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1171 |
try { |
1172 |
lock2.getWaitQueueLength(c); |
1173 |
shouldThrow(); |
1174 |
} catch (IllegalArgumentException success) {} |
1175 |
} |
1176 |
|
1177 |
/** |
1178 |
* getWaitQueueLength throws IMSE if not locked |
1179 |
*/ |
1180 |
public void testGetWaitQueueLengthIMSE() { |
1181 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1182 |
final Condition c = lock.writeLock().newCondition(); |
1183 |
try { |
1184 |
lock.getWaitQueueLength(c); |
1185 |
shouldThrow(); |
1186 |
} catch (IllegalMonitorStateException success) {} |
1187 |
} |
1188 |
|
1189 |
|
1190 |
/** |
1191 |
* getWaitingThreads throws IAE if not owned |
1192 |
*/ |
1193 |
public void testGetWaitingThreadsIAE() { |
1194 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1195 |
final Condition c = lock.writeLock().newCondition(); |
1196 |
final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock(); |
1197 |
try { |
1198 |
lock2.getWaitingThreads(c); |
1199 |
shouldThrow(); |
1200 |
} catch (IllegalArgumentException success) {} |
1201 |
} |
1202 |
|
1203 |
/** |
1204 |
* getWaitingThreads throws IMSE if not locked |
1205 |
*/ |
1206 |
public void testGetWaitingThreadsIMSE() { |
1207 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1208 |
final Condition c = lock.writeLock().newCondition(); |
1209 |
try { |
1210 |
lock.getWaitingThreads(c); |
1211 |
shouldThrow(); |
1212 |
} catch (IllegalMonitorStateException success) {} |
1213 |
} |
1214 |
|
1215 |
|
1216 |
/** |
1217 |
* hasWaiters returns true when a thread is waiting, else false |
1218 |
*/ |
1219 |
public void testHasWaiters() throws InterruptedException { |
1220 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1221 |
final Condition c = lock.writeLock().newCondition(); |
1222 |
Thread t = new Thread(new CheckedRunnable() { |
1223 |
public void realRun() throws InterruptedException { |
1224 |
lock.writeLock().lock(); |
1225 |
threadAssertFalse(lock.hasWaiters(c)); |
1226 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
1227 |
c.await(); |
1228 |
lock.writeLock().unlock(); |
1229 |
}}); |
1230 |
|
1231 |
t.start(); |
1232 |
Thread.sleep(SHORT_DELAY_MS); |
1233 |
lock.writeLock().lock(); |
1234 |
assertTrue(lock.hasWaiters(c)); |
1235 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1236 |
c.signal(); |
1237 |
lock.writeLock().unlock(); |
1238 |
Thread.sleep(SHORT_DELAY_MS); |
1239 |
lock.writeLock().lock(); |
1240 |
assertFalse(lock.hasWaiters(c)); |
1241 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1242 |
lock.writeLock().unlock(); |
1243 |
t.join(SHORT_DELAY_MS); |
1244 |
assertFalse(t.isAlive()); |
1245 |
} |
1246 |
|
1247 |
/** |
1248 |
* getWaitQueueLength returns number of waiting threads |
1249 |
*/ |
1250 |
public void testGetWaitQueueLength() throws InterruptedException { |
1251 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1252 |
final Condition c = lock.writeLock().newCondition(); |
1253 |
Thread t = new Thread(new CheckedRunnable() { |
1254 |
public void realRun() throws InterruptedException { |
1255 |
lock.writeLock().lock(); |
1256 |
threadAssertFalse(lock.hasWaiters(c)); |
1257 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
1258 |
c.await(); |
1259 |
lock.writeLock().unlock(); |
1260 |
}}); |
1261 |
|
1262 |
t.start(); |
1263 |
Thread.sleep(SHORT_DELAY_MS); |
1264 |
lock.writeLock().lock(); |
1265 |
assertTrue(lock.hasWaiters(c)); |
1266 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1267 |
c.signal(); |
1268 |
lock.writeLock().unlock(); |
1269 |
Thread.sleep(SHORT_DELAY_MS); |
1270 |
lock.writeLock().lock(); |
1271 |
assertFalse(lock.hasWaiters(c)); |
1272 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1273 |
lock.writeLock().unlock(); |
1274 |
t.join(SHORT_DELAY_MS); |
1275 |
assertFalse(t.isAlive()); |
1276 |
} |
1277 |
|
1278 |
|
1279 |
/** |
1280 |
* getWaitingThreads returns only and all waiting threads |
1281 |
*/ |
1282 |
public void testGetWaitingThreads() throws InterruptedException { |
1283 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1284 |
final Condition c = lock.writeLock().newCondition(); |
1285 |
Thread t1 = new Thread(new CheckedRunnable() { |
1286 |
public void realRun() throws InterruptedException { |
1287 |
lock.writeLock().lock(); |
1288 |
threadAssertTrue(lock.getWaitingThreads(c).isEmpty()); |
1289 |
c.await(); |
1290 |
lock.writeLock().unlock(); |
1291 |
}}); |
1292 |
|
1293 |
Thread t2 = new Thread(new CheckedRunnable() { |
1294 |
public void realRun() throws InterruptedException { |
1295 |
lock.writeLock().lock(); |
1296 |
threadAssertFalse(lock.getWaitingThreads(c).isEmpty()); |
1297 |
c.await(); |
1298 |
lock.writeLock().unlock(); |
1299 |
}}); |
1300 |
|
1301 |
lock.writeLock().lock(); |
1302 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1303 |
lock.writeLock().unlock(); |
1304 |
t1.start(); |
1305 |
Thread.sleep(SHORT_DELAY_MS); |
1306 |
t2.start(); |
1307 |
Thread.sleep(SHORT_DELAY_MS); |
1308 |
lock.writeLock().lock(); |
1309 |
assertTrue(lock.hasWaiters(c)); |
1310 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
1311 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
1312 |
c.signalAll(); |
1313 |
lock.writeLock().unlock(); |
1314 |
Thread.sleep(SHORT_DELAY_MS); |
1315 |
lock.writeLock().lock(); |
1316 |
assertFalse(lock.hasWaiters(c)); |
1317 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1318 |
lock.writeLock().unlock(); |
1319 |
t1.join(SHORT_DELAY_MS); |
1320 |
t2.join(SHORT_DELAY_MS); |
1321 |
assertFalse(t1.isAlive()); |
1322 |
assertFalse(t2.isAlive()); |
1323 |
} |
1324 |
|
1325 |
/** |
1326 |
* toString indicates current lock state |
1327 |
*/ |
1328 |
public void testToString() { |
1329 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1330 |
String us = lock.toString(); |
1331 |
assertTrue(us.indexOf("Write locks = 0") >= 0); |
1332 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1333 |
lock.writeLock().lock(); |
1334 |
String ws = lock.toString(); |
1335 |
assertTrue(ws.indexOf("Write locks = 1") >= 0); |
1336 |
assertTrue(ws.indexOf("Read locks = 0") >= 0); |
1337 |
lock.writeLock().unlock(); |
1338 |
lock.readLock().lock(); |
1339 |
lock.readLock().lock(); |
1340 |
String rs = lock.toString(); |
1341 |
assertTrue(rs.indexOf("Write locks = 0") >= 0); |
1342 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1343 |
} |
1344 |
|
1345 |
/** |
1346 |
* readLock.toString indicates current lock state |
1347 |
*/ |
1348 |
public void testReadLockToString() { |
1349 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1350 |
String us = lock.readLock().toString(); |
1351 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1352 |
lock.readLock().lock(); |
1353 |
lock.readLock().lock(); |
1354 |
String rs = lock.readLock().toString(); |
1355 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1356 |
} |
1357 |
|
1358 |
/** |
1359 |
* writeLock.toString indicates current lock state |
1360 |
*/ |
1361 |
public void testWriteLockToString() { |
1362 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1363 |
String us = lock.writeLock().toString(); |
1364 |
assertTrue(us.indexOf("Unlocked") >= 0); |
1365 |
lock.writeLock().lock(); |
1366 |
String ls = lock.writeLock().toString(); |
1367 |
assertTrue(ls.indexOf("Locked") >= 0); |
1368 |
} |
1369 |
|
1370 |
} |