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, |
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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 |
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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(); |
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 |
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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 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 Runnable() { |
270 |
public void run() { |
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threadAssertFalse(lock.writeLock().tryLock()); |
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} |
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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 |
282 |
*/ |
283 |
public void testReadTryLockWhenLocked() throws InterruptedException { |
284 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = new Thread(new Runnable() { |
287 |
public void run() { |
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threadAssertFalse(lock.readLock().tryLock()); |
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} |
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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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} |
296 |
|
297 |
/** |
298 |
* Multiple threads can hold a read lock when not write-locked |
299 |
*/ |
300 |
public void testMultipleReadLocks() throws InterruptedException { |
301 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.readLock().lock(); |
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Thread t = new Thread(new Runnable() { |
304 |
public void run() { |
305 |
threadAssertTrue(lock.readLock().tryLock()); |
306 |
lock.readLock().unlock(); |
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} |
308 |
}); |
309 |
|
310 |
t.start(); |
311 |
t.join(); |
312 |
lock.readLock().unlock(); |
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} |
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|
315 |
/** |
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* A writelock succeeds after reading threads unlock |
317 |
*/ |
318 |
public void testWriteAfterMultipleReadLocks() throws InterruptedException { |
319 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
320 |
lock.readLock().lock(); |
321 |
Thread t1 = new Thread(new Runnable() { |
322 |
public void run() { |
323 |
lock.readLock().lock(); |
324 |
lock.readLock().unlock(); |
325 |
} |
326 |
}); |
327 |
Thread t2 = new Thread(new Runnable() { |
328 |
public void run() { |
329 |
lock.writeLock().lock(); |
330 |
lock.writeLock().unlock(); |
331 |
} |
332 |
}); |
333 |
|
334 |
t1.start(); |
335 |
t2.start(); |
336 |
Thread.sleep(SHORT_DELAY_MS); |
337 |
lock.readLock().unlock(); |
338 |
t1.join(MEDIUM_DELAY_MS); |
339 |
t2.join(MEDIUM_DELAY_MS); |
340 |
assertTrue(!t1.isAlive()); |
341 |
assertTrue(!t2.isAlive()); |
342 |
} |
343 |
|
344 |
/** |
345 |
* Readlocks succeed after a writing thread unlocks |
346 |
*/ |
347 |
public void testReadAfterWriteLock() throws InterruptedException { |
348 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
349 |
lock.writeLock().lock(); |
350 |
Thread t1 = new Thread(new Runnable() { |
351 |
public void run() { |
352 |
lock.readLock().lock(); |
353 |
lock.readLock().unlock(); |
354 |
} |
355 |
}); |
356 |
Thread t2 = new Thread(new Runnable() { |
357 |
public void run() { |
358 |
lock.readLock().lock(); |
359 |
lock.readLock().unlock(); |
360 |
} |
361 |
}); |
362 |
|
363 |
t1.start(); |
364 |
t2.start(); |
365 |
Thread.sleep(SHORT_DELAY_MS); |
366 |
lock.writeLock().unlock(); |
367 |
t1.join(MEDIUM_DELAY_MS); |
368 |
t2.join(MEDIUM_DELAY_MS); |
369 |
assertTrue(!t1.isAlive()); |
370 |
assertTrue(!t2.isAlive()); |
371 |
} |
372 |
|
373 |
/** |
374 |
* Read trylock succeeds if write locked by current thread |
375 |
*/ |
376 |
public void testReadHoldingWriteLock() { |
377 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
378 |
lock.writeLock().lock(); |
379 |
assertTrue(lock.readLock().tryLock()); |
380 |
lock.readLock().unlock(); |
381 |
lock.writeLock().unlock(); |
382 |
} |
383 |
|
384 |
/** |
385 |
* Read lock succeeds if write locked by current thread even if |
386 |
* other threads are waiting for readlock |
387 |
*/ |
388 |
public void testReadHoldingWriteLock2() throws InterruptedException { |
389 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
390 |
lock.writeLock().lock(); |
391 |
Thread t1 = new Thread(new Runnable() { |
392 |
public void run() { |
393 |
lock.readLock().lock(); |
394 |
lock.readLock().unlock(); |
395 |
} |
396 |
}); |
397 |
Thread t2 = new Thread(new Runnable() { |
398 |
public void run() { |
399 |
lock.readLock().lock(); |
400 |
lock.readLock().unlock(); |
401 |
} |
402 |
}); |
403 |
|
404 |
t1.start(); |
405 |
t2.start(); |
406 |
lock.readLock().lock(); |
407 |
lock.readLock().unlock(); |
408 |
Thread.sleep(SHORT_DELAY_MS); |
409 |
lock.readLock().lock(); |
410 |
lock.readLock().unlock(); |
411 |
lock.writeLock().unlock(); |
412 |
t1.join(MEDIUM_DELAY_MS); |
413 |
t2.join(MEDIUM_DELAY_MS); |
414 |
assertTrue(!t1.isAlive()); |
415 |
assertTrue(!t2.isAlive()); |
416 |
} |
417 |
|
418 |
/** |
419 |
* Read lock succeeds if write locked by current thread even if |
420 |
* other threads are waiting for writelock |
421 |
*/ |
422 |
public void testReadHoldingWriteLock3() throws InterruptedException { |
423 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
424 |
lock.writeLock().lock(); |
425 |
Thread t1 = new Thread(new Runnable() { |
426 |
public void run() { |
427 |
lock.writeLock().lock(); |
428 |
lock.writeLock().unlock(); |
429 |
} |
430 |
}); |
431 |
Thread t2 = new Thread(new Runnable() { |
432 |
public void run() { |
433 |
lock.writeLock().lock(); |
434 |
lock.writeLock().unlock(); |
435 |
} |
436 |
}); |
437 |
|
438 |
t1.start(); |
439 |
t2.start(); |
440 |
lock.readLock().lock(); |
441 |
lock.readLock().unlock(); |
442 |
Thread.sleep(SHORT_DELAY_MS); |
443 |
lock.readLock().lock(); |
444 |
lock.readLock().unlock(); |
445 |
lock.writeLock().unlock(); |
446 |
t1.join(MEDIUM_DELAY_MS); |
447 |
t2.join(MEDIUM_DELAY_MS); |
448 |
assertTrue(!t1.isAlive()); |
449 |
assertTrue(!t2.isAlive()); |
450 |
} |
451 |
|
452 |
|
453 |
/** |
454 |
* Write lock succeeds if write locked by current thread even if |
455 |
* other threads are waiting for writelock |
456 |
*/ |
457 |
public void testWriteHoldingWriteLock4() throws InterruptedException { |
458 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
459 |
lock.writeLock().lock(); |
460 |
Thread t1 = new Thread(new Runnable() { |
461 |
public void run() { |
462 |
lock.writeLock().lock(); |
463 |
lock.writeLock().unlock(); |
464 |
} |
465 |
}); |
466 |
Thread t2 = new Thread(new Runnable() { |
467 |
public void run() { |
468 |
lock.writeLock().lock(); |
469 |
lock.writeLock().unlock(); |
470 |
} |
471 |
}); |
472 |
|
473 |
t1.start(); |
474 |
t2.start(); |
475 |
lock.writeLock().lock(); |
476 |
lock.writeLock().unlock(); |
477 |
Thread.sleep(SHORT_DELAY_MS); |
478 |
lock.writeLock().lock(); |
479 |
lock.writeLock().unlock(); |
480 |
lock.writeLock().unlock(); |
481 |
t1.join(MEDIUM_DELAY_MS); |
482 |
t2.join(MEDIUM_DELAY_MS); |
483 |
assertTrue(!t1.isAlive()); |
484 |
assertTrue(!t2.isAlive()); |
485 |
} |
486 |
|
487 |
|
488 |
/** |
489 |
* Fair Read trylock succeeds if write locked by current thread |
490 |
*/ |
491 |
public void testReadHoldingWriteLockFair() { |
492 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
493 |
lock.writeLock().lock(); |
494 |
assertTrue(lock.readLock().tryLock()); |
495 |
lock.readLock().unlock(); |
496 |
lock.writeLock().unlock(); |
497 |
} |
498 |
|
499 |
/** |
500 |
* Fair Read lock succeeds if write locked by current thread even if |
501 |
* other threads are waiting for readlock |
502 |
*/ |
503 |
public void testReadHoldingWriteLockFair2() throws InterruptedException { |
504 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
505 |
lock.writeLock().lock(); |
506 |
Thread t1 = new Thread(new Runnable() { |
507 |
public void run() { |
508 |
lock.readLock().lock(); |
509 |
lock.readLock().unlock(); |
510 |
} |
511 |
}); |
512 |
Thread t2 = new Thread(new Runnable() { |
513 |
public void run() { |
514 |
lock.readLock().lock(); |
515 |
lock.readLock().unlock(); |
516 |
} |
517 |
}); |
518 |
|
519 |
t1.start(); |
520 |
t2.start(); |
521 |
lock.readLock().lock(); |
522 |
lock.readLock().unlock(); |
523 |
Thread.sleep(SHORT_DELAY_MS); |
524 |
lock.readLock().lock(); |
525 |
lock.readLock().unlock(); |
526 |
lock.writeLock().unlock(); |
527 |
t1.join(MEDIUM_DELAY_MS); |
528 |
t2.join(MEDIUM_DELAY_MS); |
529 |
assertTrue(!t1.isAlive()); |
530 |
assertTrue(!t2.isAlive()); |
531 |
} |
532 |
|
533 |
|
534 |
/** |
535 |
* Fair Read lock succeeds if write locked by current thread even if |
536 |
* other threads are waiting for writelock |
537 |
*/ |
538 |
public void testReadHoldingWriteLockFair3() throws InterruptedException { |
539 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
540 |
lock.writeLock().lock(); |
541 |
Thread t1 = new Thread(new Runnable() { |
542 |
public void run() { |
543 |
lock.writeLock().lock(); |
544 |
lock.writeLock().unlock(); |
545 |
} |
546 |
}); |
547 |
Thread t2 = new Thread(new Runnable() { |
548 |
public void run() { |
549 |
lock.writeLock().lock(); |
550 |
lock.writeLock().unlock(); |
551 |
} |
552 |
}); |
553 |
|
554 |
t1.start(); |
555 |
t2.start(); |
556 |
lock.readLock().lock(); |
557 |
lock.readLock().unlock(); |
558 |
Thread.sleep(SHORT_DELAY_MS); |
559 |
lock.readLock().lock(); |
560 |
lock.readLock().unlock(); |
561 |
lock.writeLock().unlock(); |
562 |
t1.join(MEDIUM_DELAY_MS); |
563 |
t2.join(MEDIUM_DELAY_MS); |
564 |
assertTrue(!t1.isAlive()); |
565 |
assertTrue(!t2.isAlive()); |
566 |
} |
567 |
|
568 |
|
569 |
/** |
570 |
* Fair Write lock succeeds if write locked by current thread even if |
571 |
* other threads are waiting for writelock |
572 |
*/ |
573 |
public void testWriteHoldingWriteLockFair4() throws InterruptedException { |
574 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
575 |
lock.writeLock().lock(); |
576 |
Thread t1 = new Thread(new Runnable() { |
577 |
public void run() { |
578 |
lock.writeLock().lock(); |
579 |
lock.writeLock().unlock(); |
580 |
} |
581 |
}); |
582 |
Thread t2 = new Thread(new Runnable() { |
583 |
public void run() { |
584 |
lock.writeLock().lock(); |
585 |
lock.writeLock().unlock(); |
586 |
} |
587 |
}); |
588 |
|
589 |
t1.start(); |
590 |
t2.start(); |
591 |
Thread.sleep(SHORT_DELAY_MS); |
592 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
593 |
assertTrue(lock.getWriteHoldCount() == 1); |
594 |
lock.writeLock().lock(); |
595 |
assertTrue(lock.getWriteHoldCount() == 2); |
596 |
lock.writeLock().unlock(); |
597 |
lock.writeLock().lock(); |
598 |
lock.writeLock().unlock(); |
599 |
lock.writeLock().unlock(); |
600 |
t1.join(MEDIUM_DELAY_MS); |
601 |
t2.join(MEDIUM_DELAY_MS); |
602 |
assertTrue(!t1.isAlive()); |
603 |
assertTrue(!t2.isAlive()); |
604 |
} |
605 |
|
606 |
|
607 |
/** |
608 |
* Read tryLock succeeds if readlocked but not writelocked |
609 |
*/ |
610 |
public void testTryLockWhenReadLocked() throws InterruptedException { |
611 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
612 |
lock.readLock().lock(); |
613 |
Thread t = new Thread(new Runnable() { |
614 |
public void run() { |
615 |
threadAssertTrue(lock.readLock().tryLock()); |
616 |
lock.readLock().unlock(); |
617 |
} |
618 |
}); |
619 |
|
620 |
t.start(); |
621 |
t.join(); |
622 |
lock.readLock().unlock(); |
623 |
} |
624 |
|
625 |
|
626 |
|
627 |
/** |
628 |
* write tryLock fails when readlocked |
629 |
*/ |
630 |
public void testWriteTryLockWhenReadLocked() throws InterruptedException { |
631 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
632 |
lock.readLock().lock(); |
633 |
Thread t = new Thread(new Runnable() { |
634 |
public void run() { |
635 |
threadAssertFalse(lock.writeLock().tryLock()); |
636 |
} |
637 |
}); |
638 |
|
639 |
t.start(); |
640 |
t.join(); |
641 |
lock.readLock().unlock(); |
642 |
} |
643 |
|
644 |
|
645 |
/** |
646 |
* Fair Read tryLock succeeds if readlocked but not writelocked |
647 |
*/ |
648 |
public void testTryLockWhenReadLockedFair() throws InterruptedException { |
649 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
650 |
lock.readLock().lock(); |
651 |
Thread t = new Thread(new Runnable() { |
652 |
public void run() { |
653 |
threadAssertTrue(lock.readLock().tryLock()); |
654 |
lock.readLock().unlock(); |
655 |
} |
656 |
}); |
657 |
|
658 |
t.start(); |
659 |
t.join(); |
660 |
lock.readLock().unlock(); |
661 |
} |
662 |
|
663 |
|
664 |
|
665 |
/** |
666 |
* Fair write tryLock fails when readlocked |
667 |
*/ |
668 |
public void testWriteTryLockWhenReadLockedFair() throws InterruptedException { |
669 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
670 |
lock.readLock().lock(); |
671 |
Thread t = new Thread(new Runnable() { |
672 |
public void run() { |
673 |
threadAssertFalse(lock.writeLock().tryLock()); |
674 |
} |
675 |
}); |
676 |
|
677 |
t.start(); |
678 |
t.join(); |
679 |
lock.readLock().unlock(); |
680 |
} |
681 |
|
682 |
|
683 |
|
684 |
/** |
685 |
* write timed tryLock times out if locked |
686 |
*/ |
687 |
public void testWriteTryLock_Timeout() throws InterruptedException { |
688 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
689 |
lock.writeLock().lock(); |
690 |
Thread t = new Thread(new CheckedRunnable() { |
691 |
public void realRun() throws InterruptedException { |
692 |
threadAssertFalse(lock.writeLock().tryLock(1, MILLISECONDS)); |
693 |
}}); |
694 |
|
695 |
t.start(); |
696 |
t.join(); |
697 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
698 |
lock.writeLock().unlock(); |
699 |
} |
700 |
|
701 |
/** |
702 |
* read timed tryLock times out if write-locked |
703 |
*/ |
704 |
public void testReadTryLock_Timeout() throws InterruptedException { |
705 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
706 |
lock.writeLock().lock(); |
707 |
Thread t = new Thread(new CheckedRunnable() { |
708 |
public void realRun() throws InterruptedException { |
709 |
threadAssertFalse(lock.readLock().tryLock(1, MILLISECONDS)); |
710 |
}}); |
711 |
|
712 |
t.start(); |
713 |
t.join(); |
714 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
715 |
lock.writeLock().unlock(); |
716 |
} |
717 |
|
718 |
|
719 |
/** |
720 |
* write lockInterruptibly succeeds if lock free else is interruptible |
721 |
*/ |
722 |
public void testWriteLockInterruptibly() throws InterruptedException { |
723 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
724 |
lock.writeLock().lockInterruptibly(); |
725 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
726 |
public void realRun() throws InterruptedException { |
727 |
lock.writeLock().lockInterruptibly(); |
728 |
}}); |
729 |
|
730 |
t.start(); |
731 |
Thread.sleep(SHORT_DELAY_MS); |
732 |
t.interrupt(); |
733 |
Thread.sleep(SHORT_DELAY_MS); |
734 |
t.join(); |
735 |
lock.writeLock().unlock(); |
736 |
} |
737 |
|
738 |
/** |
739 |
* read lockInterruptibly succeeds if lock free else is interruptible |
740 |
*/ |
741 |
public void testReadLockInterruptibly() throws InterruptedException { |
742 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
743 |
lock.writeLock().lockInterruptibly(); |
744 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
745 |
public void realRun() throws InterruptedException { |
746 |
lock.readLock().lockInterruptibly(); |
747 |
}}); |
748 |
|
749 |
t.start(); |
750 |
Thread.sleep(SHORT_DELAY_MS); |
751 |
t.interrupt(); |
752 |
t.join(); |
753 |
lock.writeLock().unlock(); |
754 |
} |
755 |
|
756 |
/** |
757 |
* Calling await without holding lock throws IllegalMonitorStateException |
758 |
*/ |
759 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
760 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
761 |
final Condition c = lock.writeLock().newCondition(); |
762 |
try { |
763 |
c.await(); |
764 |
shouldThrow(); |
765 |
} catch (IllegalMonitorStateException success) {} |
766 |
} |
767 |
|
768 |
/** |
769 |
* Calling signal without holding lock throws IllegalMonitorStateException |
770 |
*/ |
771 |
public void testSignal_IllegalMonitor() { |
772 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
773 |
final Condition c = lock.writeLock().newCondition(); |
774 |
try { |
775 |
c.signal(); |
776 |
shouldThrow(); |
777 |
} catch (IllegalMonitorStateException success) {} |
778 |
} |
779 |
|
780 |
/** |
781 |
* awaitNanos without a signal times out |
782 |
*/ |
783 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
784 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
785 |
final Condition c = lock.writeLock().newCondition(); |
786 |
|
787 |
lock.writeLock().lock(); |
788 |
long t = c.awaitNanos(100); |
789 |
assertTrue(t <= 0); |
790 |
lock.writeLock().unlock(); |
791 |
} |
792 |
|
793 |
|
794 |
/** |
795 |
* timed await without a signal times out |
796 |
*/ |
797 |
public void testAwait_Timeout() throws InterruptedException { |
798 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
799 |
final Condition c = lock.writeLock().newCondition(); |
800 |
lock.writeLock().lock(); |
801 |
assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS)); |
802 |
lock.writeLock().unlock(); |
803 |
} |
804 |
|
805 |
/** |
806 |
* awaitUntil without a signal times out |
807 |
*/ |
808 |
public void testAwaitUntil_Timeout() throws InterruptedException { |
809 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
810 |
final Condition c = lock.writeLock().newCondition(); |
811 |
lock.writeLock().lock(); |
812 |
java.util.Date d = new java.util.Date(); |
813 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
814 |
lock.writeLock().unlock(); |
815 |
} |
816 |
|
817 |
/** |
818 |
* await returns when signalled |
819 |
*/ |
820 |
public void testAwait() throws InterruptedException { |
821 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
822 |
final Condition c = lock.writeLock().newCondition(); |
823 |
Thread t = new Thread(new CheckedRunnable() { |
824 |
public void realRun() throws InterruptedException { |
825 |
lock.writeLock().lock(); |
826 |
c.await(); |
827 |
lock.writeLock().unlock(); |
828 |
}}); |
829 |
|
830 |
t.start(); |
831 |
Thread.sleep(SHORT_DELAY_MS); |
832 |
lock.writeLock().lock(); |
833 |
c.signal(); |
834 |
lock.writeLock().unlock(); |
835 |
t.join(SHORT_DELAY_MS); |
836 |
assertFalse(t.isAlive()); |
837 |
} |
838 |
|
839 |
/** A helper class for uninterruptible wait tests */ |
840 |
class UninterruptableThread extends Thread { |
841 |
private Lock lock; |
842 |
private Condition c; |
843 |
|
844 |
public volatile boolean canAwake = false; |
845 |
public volatile boolean interrupted = false; |
846 |
public volatile boolean lockStarted = false; |
847 |
|
848 |
public UninterruptableThread(Lock lock, Condition c) { |
849 |
this.lock = lock; |
850 |
this.c = c; |
851 |
} |
852 |
|
853 |
public synchronized void run() { |
854 |
lock.lock(); |
855 |
lockStarted = true; |
856 |
|
857 |
while (!canAwake) { |
858 |
c.awaitUninterruptibly(); |
859 |
} |
860 |
|
861 |
interrupted = isInterrupted(); |
862 |
lock.unlock(); |
863 |
} |
864 |
} |
865 |
|
866 |
/** |
867 |
* awaitUninterruptibly doesn't abort on interrupt |
868 |
*/ |
869 |
public void testAwaitUninterruptibly() throws InterruptedException { |
870 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
871 |
final Condition c = lock.writeLock().newCondition(); |
872 |
UninterruptableThread thread = new UninterruptableThread(lock.writeLock(), c); |
873 |
|
874 |
thread.start(); |
875 |
|
876 |
while (!thread.lockStarted) { |
877 |
Thread.sleep(100); |
878 |
} |
879 |
|
880 |
lock.writeLock().lock(); |
881 |
try { |
882 |
thread.interrupt(); |
883 |
thread.canAwake = true; |
884 |
c.signal(); |
885 |
} finally { |
886 |
lock.writeLock().unlock(); |
887 |
} |
888 |
|
889 |
thread.join(); |
890 |
assertTrue(thread.interrupted); |
891 |
assertFalse(thread.isAlive()); |
892 |
} |
893 |
|
894 |
/** |
895 |
* await is interruptible |
896 |
*/ |
897 |
public void testAwait_Interrupt() throws InterruptedException { |
898 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
899 |
final Condition c = lock.writeLock().newCondition(); |
900 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
901 |
public void realRun() throws InterruptedException { |
902 |
lock.writeLock().lock(); |
903 |
c.await(); |
904 |
lock.writeLock().unlock(); |
905 |
}}); |
906 |
|
907 |
t.start(); |
908 |
Thread.sleep(SHORT_DELAY_MS); |
909 |
t.interrupt(); |
910 |
t.join(SHORT_DELAY_MS); |
911 |
assertFalse(t.isAlive()); |
912 |
} |
913 |
|
914 |
/** |
915 |
* awaitNanos is interruptible |
916 |
*/ |
917 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
918 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
919 |
final Condition c = lock.writeLock().newCondition(); |
920 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
921 |
public void realRun() throws InterruptedException { |
922 |
lock.writeLock().lock(); |
923 |
c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000); |
924 |
lock.writeLock().unlock(); |
925 |
}}); |
926 |
|
927 |
t.start(); |
928 |
Thread.sleep(SHORT_DELAY_MS); |
929 |
t.interrupt(); |
930 |
t.join(SHORT_DELAY_MS); |
931 |
assertFalse(t.isAlive()); |
932 |
} |
933 |
|
934 |
/** |
935 |
* awaitUntil is interruptible |
936 |
*/ |
937 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
938 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
939 |
final Condition c = lock.writeLock().newCondition(); |
940 |
Thread t = new Thread(new CheckedInterruptedRunnable() { |
941 |
public void realRun() throws InterruptedException { |
942 |
lock.writeLock().lock(); |
943 |
java.util.Date d = new java.util.Date(); |
944 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
945 |
lock.writeLock().unlock(); |
946 |
}}); |
947 |
|
948 |
t.start(); |
949 |
Thread.sleep(SHORT_DELAY_MS); |
950 |
t.interrupt(); |
951 |
t.join(SHORT_DELAY_MS); |
952 |
assertFalse(t.isAlive()); |
953 |
} |
954 |
|
955 |
/** |
956 |
* signalAll wakes up all threads |
957 |
*/ |
958 |
public void testSignalAll() throws InterruptedException { |
959 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
960 |
final Condition c = lock.writeLock().newCondition(); |
961 |
Thread t1 = new Thread(new CheckedRunnable() { |
962 |
public void realRun() throws InterruptedException { |
963 |
lock.writeLock().lock(); |
964 |
c.await(); |
965 |
lock.writeLock().unlock(); |
966 |
}}); |
967 |
|
968 |
Thread t2 = new Thread(new CheckedRunnable() { |
969 |
public void realRun() throws InterruptedException { |
970 |
lock.writeLock().lock(); |
971 |
c.await(); |
972 |
lock.writeLock().unlock(); |
973 |
}}); |
974 |
|
975 |
t1.start(); |
976 |
t2.start(); |
977 |
Thread.sleep(SHORT_DELAY_MS); |
978 |
lock.writeLock().lock(); |
979 |
c.signalAll(); |
980 |
lock.writeLock().unlock(); |
981 |
t1.join(SHORT_DELAY_MS); |
982 |
t2.join(SHORT_DELAY_MS); |
983 |
assertFalse(t1.isAlive()); |
984 |
assertFalse(t2.isAlive()); |
985 |
} |
986 |
|
987 |
/** |
988 |
* A serialized lock deserializes as unlocked |
989 |
*/ |
990 |
public void testSerialization() throws Exception { |
991 |
ReentrantReadWriteLock l = new ReentrantReadWriteLock(); |
992 |
l.readLock().lock(); |
993 |
l.readLock().unlock(); |
994 |
|
995 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
996 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
997 |
out.writeObject(l); |
998 |
out.close(); |
999 |
|
1000 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
1001 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
1002 |
ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject(); |
1003 |
r.readLock().lock(); |
1004 |
r.readLock().unlock(); |
1005 |
} |
1006 |
|
1007 |
/** |
1008 |
* hasQueuedThreads reports whether there are waiting threads |
1009 |
*/ |
1010 |
public void testhasQueuedThreads() throws InterruptedException { |
1011 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1012 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1013 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1014 |
assertFalse(lock.hasQueuedThreads()); |
1015 |
lock.writeLock().lock(); |
1016 |
t1.start(); |
1017 |
Thread.sleep(SHORT_DELAY_MS); |
1018 |
assertTrue(lock.hasQueuedThreads()); |
1019 |
t2.start(); |
1020 |
Thread.sleep(SHORT_DELAY_MS); |
1021 |
assertTrue(lock.hasQueuedThreads()); |
1022 |
t1.interrupt(); |
1023 |
Thread.sleep(SHORT_DELAY_MS); |
1024 |
assertTrue(lock.hasQueuedThreads()); |
1025 |
lock.writeLock().unlock(); |
1026 |
Thread.sleep(SHORT_DELAY_MS); |
1027 |
assertFalse(lock.hasQueuedThreads()); |
1028 |
t1.join(); |
1029 |
t2.join(); |
1030 |
} |
1031 |
|
1032 |
/** |
1033 |
* hasQueuedThread(null) throws NPE |
1034 |
*/ |
1035 |
public void testHasQueuedThreadNPE() { |
1036 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
1037 |
try { |
1038 |
sync.hasQueuedThread(null); |
1039 |
shouldThrow(); |
1040 |
} catch (NullPointerException success) {} |
1041 |
} |
1042 |
|
1043 |
/** |
1044 |
* hasQueuedThread reports whether a thread is queued. |
1045 |
*/ |
1046 |
public void testHasQueuedThread() throws InterruptedException { |
1047 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
1048 |
Thread t1 = new Thread(new InterruptedLockRunnable(sync)); |
1049 |
Thread t2 = new Thread(new InterruptibleLockRunnable(sync)); |
1050 |
assertFalse(sync.hasQueuedThread(t1)); |
1051 |
assertFalse(sync.hasQueuedThread(t2)); |
1052 |
sync.writeLock().lock(); |
1053 |
t1.start(); |
1054 |
Thread.sleep(SHORT_DELAY_MS); |
1055 |
assertTrue(sync.hasQueuedThread(t1)); |
1056 |
t2.start(); |
1057 |
Thread.sleep(SHORT_DELAY_MS); |
1058 |
assertTrue(sync.hasQueuedThread(t1)); |
1059 |
assertTrue(sync.hasQueuedThread(t2)); |
1060 |
t1.interrupt(); |
1061 |
Thread.sleep(SHORT_DELAY_MS); |
1062 |
assertFalse(sync.hasQueuedThread(t1)); |
1063 |
assertTrue(sync.hasQueuedThread(t2)); |
1064 |
sync.writeLock().unlock(); |
1065 |
Thread.sleep(SHORT_DELAY_MS); |
1066 |
assertFalse(sync.hasQueuedThread(t1)); |
1067 |
Thread.sleep(SHORT_DELAY_MS); |
1068 |
assertFalse(sync.hasQueuedThread(t2)); |
1069 |
t1.join(); |
1070 |
t2.join(); |
1071 |
} |
1072 |
|
1073 |
|
1074 |
/** |
1075 |
* getQueueLength reports number of waiting threads |
1076 |
*/ |
1077 |
public void testGetQueueLength() throws InterruptedException { |
1078 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1079 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1080 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1081 |
assertEquals(0, lock.getQueueLength()); |
1082 |
lock.writeLock().lock(); |
1083 |
t1.start(); |
1084 |
Thread.sleep(SHORT_DELAY_MS); |
1085 |
assertEquals(1, lock.getQueueLength()); |
1086 |
t2.start(); |
1087 |
Thread.sleep(SHORT_DELAY_MS); |
1088 |
assertEquals(2, lock.getQueueLength()); |
1089 |
t1.interrupt(); |
1090 |
Thread.sleep(SHORT_DELAY_MS); |
1091 |
assertEquals(1, lock.getQueueLength()); |
1092 |
lock.writeLock().unlock(); |
1093 |
Thread.sleep(SHORT_DELAY_MS); |
1094 |
assertEquals(0, lock.getQueueLength()); |
1095 |
t1.join(); |
1096 |
t2.join(); |
1097 |
} |
1098 |
|
1099 |
/** |
1100 |
* getQueuedThreads includes waiting threads |
1101 |
*/ |
1102 |
public void testGetQueuedThreads() throws InterruptedException { |
1103 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1104 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1105 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1106 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1107 |
lock.writeLock().lock(); |
1108 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1109 |
t1.start(); |
1110 |
Thread.sleep(SHORT_DELAY_MS); |
1111 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1112 |
t2.start(); |
1113 |
Thread.sleep(SHORT_DELAY_MS); |
1114 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1115 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1116 |
t1.interrupt(); |
1117 |
Thread.sleep(SHORT_DELAY_MS); |
1118 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
1119 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1120 |
lock.writeLock().unlock(); |
1121 |
Thread.sleep(SHORT_DELAY_MS); |
1122 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1123 |
t1.join(); |
1124 |
t2.join(); |
1125 |
} |
1126 |
|
1127 |
/** |
1128 |
* hasWaiters throws NPE if null |
1129 |
*/ |
1130 |
public void testHasWaitersNPE() { |
1131 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1132 |
try { |
1133 |
lock.hasWaiters(null); |
1134 |
shouldThrow(); |
1135 |
} catch (NullPointerException success) {} |
1136 |
} |
1137 |
|
1138 |
/** |
1139 |
* getWaitQueueLength throws NPE if null |
1140 |
*/ |
1141 |
public void testGetWaitQueueLengthNPE() { |
1142 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1143 |
try { |
1144 |
lock.getWaitQueueLength(null); |
1145 |
shouldThrow(); |
1146 |
} catch (NullPointerException success) {} |
1147 |
} |
1148 |
|
1149 |
|
1150 |
/** |
1151 |
* getWaitingThreads throws NPE if null |
1152 |
*/ |
1153 |
public void testGetWaitingThreadsNPE() { |
1154 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1155 |
try { |
1156 |
lock.getWaitingThreads(null); |
1157 |
shouldThrow(); |
1158 |
} catch (NullPointerException success) {} |
1159 |
} |
1160 |
|
1161 |
/** |
1162 |
* hasWaiters throws IAE if not owned |
1163 |
*/ |
1164 |
public void testHasWaitersIAE() { |
1165 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1166 |
final Condition c = lock.writeLock().newCondition(); |
1167 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1168 |
try { |
1169 |
lock2.hasWaiters(c); |
1170 |
shouldThrow(); |
1171 |
} catch (IllegalArgumentException success) {} |
1172 |
} |
1173 |
|
1174 |
/** |
1175 |
* hasWaiters throws IMSE if not locked |
1176 |
*/ |
1177 |
public void testHasWaitersIMSE() { |
1178 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1179 |
final Condition c = lock.writeLock().newCondition(); |
1180 |
try { |
1181 |
lock.hasWaiters(c); |
1182 |
shouldThrow(); |
1183 |
} catch (IllegalMonitorStateException success) {} |
1184 |
} |
1185 |
|
1186 |
|
1187 |
/** |
1188 |
* getWaitQueueLength throws IAE if not owned |
1189 |
*/ |
1190 |
public void testGetWaitQueueLengthIAE() { |
1191 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1192 |
final Condition c = lock.writeLock().newCondition(); |
1193 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1194 |
try { |
1195 |
lock2.getWaitQueueLength(c); |
1196 |
shouldThrow(); |
1197 |
} catch (IllegalArgumentException success) {} |
1198 |
} |
1199 |
|
1200 |
/** |
1201 |
* getWaitQueueLength throws IMSE if not locked |
1202 |
*/ |
1203 |
public void testGetWaitQueueLengthIMSE() { |
1204 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1205 |
final Condition c = lock.writeLock().newCondition(); |
1206 |
try { |
1207 |
lock.getWaitQueueLength(c); |
1208 |
shouldThrow(); |
1209 |
} catch (IllegalMonitorStateException success) {} |
1210 |
} |
1211 |
|
1212 |
|
1213 |
/** |
1214 |
* getWaitingThreads throws IAE if not owned |
1215 |
*/ |
1216 |
public void testGetWaitingThreadsIAE() { |
1217 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1218 |
final Condition c = lock.writeLock().newCondition(); |
1219 |
final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock(); |
1220 |
try { |
1221 |
lock2.getWaitingThreads(c); |
1222 |
shouldThrow(); |
1223 |
} catch (IllegalArgumentException success) {} |
1224 |
} |
1225 |
|
1226 |
/** |
1227 |
* getWaitingThreads throws IMSE if not locked |
1228 |
*/ |
1229 |
public void testGetWaitingThreadsIMSE() { |
1230 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1231 |
final Condition c = lock.writeLock().newCondition(); |
1232 |
try { |
1233 |
lock.getWaitingThreads(c); |
1234 |
shouldThrow(); |
1235 |
} catch (IllegalMonitorStateException success) {} |
1236 |
} |
1237 |
|
1238 |
|
1239 |
/** |
1240 |
* hasWaiters returns true when a thread is waiting, else false |
1241 |
*/ |
1242 |
public void testHasWaiters() throws InterruptedException { |
1243 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1244 |
final Condition c = lock.writeLock().newCondition(); |
1245 |
Thread t = new Thread(new CheckedRunnable() { |
1246 |
public void realRun() throws InterruptedException { |
1247 |
lock.writeLock().lock(); |
1248 |
threadAssertFalse(lock.hasWaiters(c)); |
1249 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
1250 |
c.await(); |
1251 |
lock.writeLock().unlock(); |
1252 |
}}); |
1253 |
|
1254 |
t.start(); |
1255 |
Thread.sleep(SHORT_DELAY_MS); |
1256 |
lock.writeLock().lock(); |
1257 |
assertTrue(lock.hasWaiters(c)); |
1258 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1259 |
c.signal(); |
1260 |
lock.writeLock().unlock(); |
1261 |
Thread.sleep(SHORT_DELAY_MS); |
1262 |
lock.writeLock().lock(); |
1263 |
assertFalse(lock.hasWaiters(c)); |
1264 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1265 |
lock.writeLock().unlock(); |
1266 |
t.join(SHORT_DELAY_MS); |
1267 |
assertFalse(t.isAlive()); |
1268 |
} |
1269 |
|
1270 |
/** |
1271 |
* getWaitQueueLength returns number of waiting threads |
1272 |
*/ |
1273 |
public void testGetWaitQueueLength() throws InterruptedException { |
1274 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1275 |
final Condition c = lock.writeLock().newCondition(); |
1276 |
Thread t = new Thread(new CheckedRunnable() { |
1277 |
public void realRun() throws InterruptedException { |
1278 |
lock.writeLock().lock(); |
1279 |
threadAssertFalse(lock.hasWaiters(c)); |
1280 |
threadAssertEquals(0, lock.getWaitQueueLength(c)); |
1281 |
c.await(); |
1282 |
lock.writeLock().unlock(); |
1283 |
}}); |
1284 |
|
1285 |
t.start(); |
1286 |
Thread.sleep(SHORT_DELAY_MS); |
1287 |
lock.writeLock().lock(); |
1288 |
assertTrue(lock.hasWaiters(c)); |
1289 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1290 |
c.signal(); |
1291 |
lock.writeLock().unlock(); |
1292 |
Thread.sleep(SHORT_DELAY_MS); |
1293 |
lock.writeLock().lock(); |
1294 |
assertFalse(lock.hasWaiters(c)); |
1295 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1296 |
lock.writeLock().unlock(); |
1297 |
t.join(SHORT_DELAY_MS); |
1298 |
assertFalse(t.isAlive()); |
1299 |
} |
1300 |
|
1301 |
|
1302 |
/** |
1303 |
* getWaitingThreads returns only and all waiting threads |
1304 |
*/ |
1305 |
public void testGetWaitingThreads() throws InterruptedException { |
1306 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1307 |
final Condition c = lock.writeLock().newCondition(); |
1308 |
Thread t1 = new Thread(new CheckedRunnable() { |
1309 |
public void realRun() throws InterruptedException { |
1310 |
lock.writeLock().lock(); |
1311 |
threadAssertTrue(lock.getWaitingThreads(c).isEmpty()); |
1312 |
c.await(); |
1313 |
lock.writeLock().unlock(); |
1314 |
}}); |
1315 |
|
1316 |
Thread t2 = new Thread(new CheckedRunnable() { |
1317 |
public void realRun() throws InterruptedException { |
1318 |
lock.writeLock().lock(); |
1319 |
threadAssertFalse(lock.getWaitingThreads(c).isEmpty()); |
1320 |
c.await(); |
1321 |
lock.writeLock().unlock(); |
1322 |
}}); |
1323 |
|
1324 |
lock.writeLock().lock(); |
1325 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1326 |
lock.writeLock().unlock(); |
1327 |
t1.start(); |
1328 |
Thread.sleep(SHORT_DELAY_MS); |
1329 |
t2.start(); |
1330 |
Thread.sleep(SHORT_DELAY_MS); |
1331 |
lock.writeLock().lock(); |
1332 |
assertTrue(lock.hasWaiters(c)); |
1333 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
1334 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
1335 |
c.signalAll(); |
1336 |
lock.writeLock().unlock(); |
1337 |
Thread.sleep(SHORT_DELAY_MS); |
1338 |
lock.writeLock().lock(); |
1339 |
assertFalse(lock.hasWaiters(c)); |
1340 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1341 |
lock.writeLock().unlock(); |
1342 |
t1.join(SHORT_DELAY_MS); |
1343 |
t2.join(SHORT_DELAY_MS); |
1344 |
assertFalse(t1.isAlive()); |
1345 |
assertFalse(t2.isAlive()); |
1346 |
} |
1347 |
|
1348 |
/** |
1349 |
* toString indicates current lock state |
1350 |
*/ |
1351 |
public void testToString() { |
1352 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1353 |
String us = lock.toString(); |
1354 |
assertTrue(us.indexOf("Write locks = 0") >= 0); |
1355 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1356 |
lock.writeLock().lock(); |
1357 |
String ws = lock.toString(); |
1358 |
assertTrue(ws.indexOf("Write locks = 1") >= 0); |
1359 |
assertTrue(ws.indexOf("Read locks = 0") >= 0); |
1360 |
lock.writeLock().unlock(); |
1361 |
lock.readLock().lock(); |
1362 |
lock.readLock().lock(); |
1363 |
String rs = lock.toString(); |
1364 |
assertTrue(rs.indexOf("Write locks = 0") >= 0); |
1365 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1366 |
} |
1367 |
|
1368 |
/** |
1369 |
* readLock.toString indicates current lock state |
1370 |
*/ |
1371 |
public void testReadLockToString() { |
1372 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1373 |
String us = lock.readLock().toString(); |
1374 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1375 |
lock.readLock().lock(); |
1376 |
lock.readLock().lock(); |
1377 |
String rs = lock.readLock().toString(); |
1378 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1379 |
} |
1380 |
|
1381 |
/** |
1382 |
* writeLock.toString indicates current lock state |
1383 |
*/ |
1384 |
public void testWriteLockToString() { |
1385 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1386 |
String us = lock.writeLock().toString(); |
1387 |
assertTrue(us.indexOf("Unlocked") >= 0); |
1388 |
lock.writeLock().lock(); |
1389 |
String ls = lock.writeLock().toString(); |
1390 |
assertTrue(ls.indexOf("Locked") >= 0); |
1391 |
} |
1392 |
|
1393 |
} |