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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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|
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import junit.framework.*; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.locks.*; |
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import java.util.concurrent.*; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import java.io.*; |
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import java.util.*; |
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|
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public class ReentrantReadWriteLockTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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} |
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public static Test suite() { |
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return new TestSuite(ReentrantReadWriteLockTest.class); |
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} |
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|
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/** |
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* A runnable calling lockInterruptibly |
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*/ |
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class InterruptibleLockRunnable extends CheckedRunnable { |
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final ReentrantReadWriteLock lock; |
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InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; } |
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public void realRun() throws InterruptedException { |
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lock.writeLock().lockInterruptibly(); |
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} |
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} |
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|
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/** |
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* A runnable calling lockInterruptibly that expects to be |
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* interrupted |
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*/ |
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class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
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final ReentrantReadWriteLock lock; |
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InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; } |
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public void realRun() throws InterruptedException { |
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lock.writeLock().lockInterruptibly(); |
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} |
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} |
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|
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/** |
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* Subclass to expose protected methods |
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*/ |
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static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock { |
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PublicReentrantReadWriteLock() { super(); } |
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public Collection<Thread> getQueuedThreads() { |
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return super.getQueuedThreads(); |
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} |
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public Collection<Thread> getWaitingThreads(Condition c) { |
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return super.getWaitingThreads(c); |
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} |
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} |
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|
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/** |
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* Releases write lock, checking that it had a hold count of 1. |
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*/ |
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void releaseWriteLock(ReentrantReadWriteLock lock) { |
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ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock(); |
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assertTrue(writeLock.isHeldByCurrentThread()); |
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writeLock.unlock(); |
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assertFalse(writeLock.isHeldByCurrentThread()); |
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} |
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|
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/** |
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* Spin-waits until lock.hasQueuedThread(t) becomes true. |
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*/ |
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void waitForQueuedThread(ReentrantReadWriteLock lock, Thread t) { |
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long startTime = System.nanoTime(); |
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while (!lock.hasQueuedThread(t)) { |
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if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
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throw new AssertionError("timed out"); |
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Thread.yield(); |
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} |
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} |
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|
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/** |
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* Checks that lock is not write-locked. |
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*/ |
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void assertNotWriteLocked(ReentrantReadWriteLock lock) { |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isWriteLockedByCurrentThread()); |
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assertEquals(0, lock.getWriteHoldCount()); |
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} |
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|
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/** |
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* Checks that condition c has no waiters. |
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*/ |
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void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) { |
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assertHasWaiters(lock, c, new Thread[] {}); |
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} |
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|
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/** |
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* Checks that condition c has exactly the given waiter threads. |
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*/ |
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void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c, |
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Thread... threads) { |
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lock.writeLock().lock(); |
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assertEquals(threads.length > 0, lock.hasWaiters(c)); |
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assertEquals(threads.length, lock.getWaitQueueLength(c)); |
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assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty()); |
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assertEquals(threads.length, lock.getWaitingThreads(c).size()); |
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assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)), |
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new HashSet<Thread>(Arrays.asList(threads))); |
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lock.writeLock().unlock(); |
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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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* 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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* write-unlocking an unlocked lock throws IllegalMonitorStateException |
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*/ |
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public void testWriteUnlock_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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* read-unlocking an unlocked lock throws IllegalMonitorStateException |
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*/ |
241 |
public void testReadUnlock_IllegalMonitorStateException() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); |
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try { |
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rl.readLock().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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* write-lockInterruptibly is interruptible |
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*/ |
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public void testWriteLockInterruptibly_Interrupted() throws Exception { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.writeLock().lockInterruptibly(); |
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}}); |
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|
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waitForQueuedThread(lock, t); |
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t.interrupt(); |
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awaitTermination(t); |
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releaseWriteLock(lock); |
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} |
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|
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/** |
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* timed write-tryLock is interruptible |
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*/ |
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public void testWriteTryLock_Interrupted() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
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lock.writeLock().tryLock(LONG_DELAY_MS, MILLISECONDS); |
275 |
}}); |
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|
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waitForQueuedThread(lock, t); |
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t.interrupt(); |
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awaitTermination(t); |
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releaseWriteLock(lock); |
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} |
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|
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/** |
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* read-lockInterruptibly is interruptible |
285 |
*/ |
286 |
public void testReadLockInterruptibly_Interrupted() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
288 |
lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
290 |
public void realRun() throws InterruptedException { |
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lock.readLock().lockInterruptibly(); |
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}}); |
293 |
|
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waitForQueuedThread(lock, t); |
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t.interrupt(); |
296 |
awaitTermination(t); |
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releaseWriteLock(lock); |
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} |
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|
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/** |
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* timed read-tryLock is interruptible |
302 |
*/ |
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public void testReadTryLock_Interrupted() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
305 |
lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
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public void realRun() throws InterruptedException { |
308 |
lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS); |
309 |
}}); |
310 |
|
311 |
waitForQueuedThread(lock, t); |
312 |
t.interrupt(); |
313 |
awaitTermination(t); |
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releaseWriteLock(lock); |
315 |
} |
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|
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/** |
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* write-tryLock fails if locked |
319 |
*/ |
320 |
public void testWriteTryLockWhenLocked() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = newStartedThread(new CheckedRunnable() { |
324 |
public void realRun() { |
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assertFalse(lock.writeLock().tryLock()); |
326 |
}}); |
327 |
|
328 |
awaitTermination(t); |
329 |
releaseWriteLock(lock); |
330 |
} |
331 |
|
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/** |
333 |
* read-tryLock fails if locked |
334 |
*/ |
335 |
public void testReadTryLockWhenLocked() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
337 |
lock.writeLock().lock(); |
338 |
Thread t = newStartedThread(new CheckedRunnable() { |
339 |
public void realRun() { |
340 |
assertFalse(lock.readLock().tryLock()); |
341 |
}}); |
342 |
|
343 |
awaitTermination(t); |
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releaseWriteLock(lock); |
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} |
346 |
|
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/** |
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* Multiple threads can hold a read lock when not write-locked |
349 |
*/ |
350 |
public void testMultipleReadLocks() throws InterruptedException { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.readLock().lock(); |
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Thread t = newStartedThread(new CheckedRunnable() { |
354 |
public void realRun() { |
355 |
assertTrue(lock.readLock().tryLock()); |
356 |
lock.readLock().unlock(); |
357 |
}}); |
358 |
|
359 |
awaitTermination(t); |
360 |
lock.readLock().unlock(); |
361 |
} |
362 |
|
363 |
/** |
364 |
* A writelock succeeds only after reading threads unlock |
365 |
*/ |
366 |
public void testWriteAfterMultipleReadLocks() throws InterruptedException { |
367 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
368 |
lock.readLock().lock(); |
369 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
370 |
public void realRun() { |
371 |
lock.readLock().lock(); |
372 |
lock.readLock().unlock(); |
373 |
}}); |
374 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
375 |
public void realRun() { |
376 |
lock.writeLock().lock(); |
377 |
lock.writeLock().unlock(); |
378 |
}}); |
379 |
delay(SHORT_DELAY_MS); |
380 |
lock.readLock().unlock(); |
381 |
awaitTermination(t1); |
382 |
awaitTermination(t2); |
383 |
assertNotWriteLocked(lock); |
384 |
} |
385 |
|
386 |
/** |
387 |
* Readlocks succeed only after a writing thread unlocks |
388 |
*/ |
389 |
public void testReadAfterWriteLock() throws InterruptedException { |
390 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
391 |
lock.writeLock().lock(); |
392 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
393 |
public void realRun() { |
394 |
lock.readLock().lock(); |
395 |
lock.readLock().unlock(); |
396 |
}}); |
397 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
398 |
public void realRun() { |
399 |
lock.readLock().lock(); |
400 |
lock.readLock().unlock(); |
401 |
}}); |
402 |
|
403 |
waitForQueuedThread(lock, t1); |
404 |
waitForQueuedThread(lock, t2); |
405 |
releaseWriteLock(lock); |
406 |
awaitTermination(t1); |
407 |
awaitTermination(t2); |
408 |
} |
409 |
|
410 |
/** |
411 |
* Read trylock succeeds if write locked by current thread |
412 |
*/ |
413 |
public void testReadHoldingWriteLock() { |
414 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
415 |
lock.writeLock().lock(); |
416 |
assertTrue(lock.readLock().tryLock()); |
417 |
lock.readLock().unlock(); |
418 |
lock.writeLock().unlock(); |
419 |
} |
420 |
|
421 |
/** |
422 |
* Read lock succeeds if write locked by current thread even if |
423 |
* other threads are waiting for readlock |
424 |
*/ |
425 |
public void testReadHoldingWriteLock2() throws InterruptedException { |
426 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
427 |
lock.writeLock().lock(); |
428 |
lock.readLock().lock(); |
429 |
lock.readLock().unlock(); |
430 |
|
431 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
432 |
public void realRun() { |
433 |
lock.readLock().lock(); |
434 |
lock.readLock().unlock(); |
435 |
}}); |
436 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
437 |
public void realRun() { |
438 |
lock.readLock().lock(); |
439 |
lock.readLock().unlock(); |
440 |
}}); |
441 |
|
442 |
waitForQueuedThread(lock, t1); |
443 |
waitForQueuedThread(lock, t2); |
444 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
445 |
lock.readLock().lock(); |
446 |
lock.readLock().unlock(); |
447 |
releaseWriteLock(lock); |
448 |
awaitTermination(t1); |
449 |
awaitTermination(t2); |
450 |
} |
451 |
|
452 |
/** |
453 |
* Read lock succeeds if write locked by current thread even if |
454 |
* other threads are waiting for writelock |
455 |
*/ |
456 |
public void testReadHoldingWriteLock3() throws InterruptedException { |
457 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
458 |
lock.writeLock().lock(); |
459 |
lock.readLock().lock(); |
460 |
lock.readLock().unlock(); |
461 |
|
462 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
463 |
public void realRun() { |
464 |
lock.writeLock().lock(); |
465 |
lock.writeLock().unlock(); |
466 |
}}); |
467 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
468 |
public void realRun() { |
469 |
lock.writeLock().lock(); |
470 |
lock.writeLock().unlock(); |
471 |
}}); |
472 |
|
473 |
waitForQueuedThread(lock, t1); |
474 |
waitForQueuedThread(lock, t2); |
475 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
476 |
lock.readLock().lock(); |
477 |
lock.readLock().unlock(); |
478 |
releaseWriteLock(lock); |
479 |
awaitTermination(t1); |
480 |
awaitTermination(t2); |
481 |
} |
482 |
|
483 |
/** |
484 |
* Write lock succeeds if write locked by current thread even if |
485 |
* other threads are waiting for writelock |
486 |
*/ |
487 |
public void testWriteHoldingWriteLock4() throws InterruptedException { |
488 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
489 |
lock.writeLock().lock(); |
490 |
lock.writeLock().lock(); |
491 |
lock.writeLock().unlock(); |
492 |
|
493 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
494 |
public void realRun() { |
495 |
lock.writeLock().lock(); |
496 |
lock.writeLock().unlock(); |
497 |
}}); |
498 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
499 |
public void realRun() { |
500 |
lock.writeLock().lock(); |
501 |
lock.writeLock().unlock(); |
502 |
}}); |
503 |
|
504 |
waitForQueuedThread(lock, t1); |
505 |
waitForQueuedThread(lock, t2); |
506 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
507 |
assertEquals(1, lock.getWriteHoldCount()); |
508 |
lock.writeLock().lock(); |
509 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
510 |
assertEquals(2, lock.getWriteHoldCount()); |
511 |
lock.writeLock().unlock(); |
512 |
releaseWriteLock(lock); |
513 |
awaitTermination(t1); |
514 |
awaitTermination(t2); |
515 |
} |
516 |
|
517 |
/** |
518 |
* Fair Read trylock succeeds if write locked by current thread |
519 |
*/ |
520 |
public void testReadHoldingWriteLockFair() { |
521 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
522 |
lock.writeLock().lock(); |
523 |
assertTrue(lock.readLock().tryLock()); |
524 |
lock.readLock().unlock(); |
525 |
lock.writeLock().unlock(); |
526 |
} |
527 |
|
528 |
/** |
529 |
* Fair Read lock succeeds if write locked by current thread even if |
530 |
* other threads are waiting for readlock |
531 |
*/ |
532 |
public void testReadHoldingWriteLockFair2() throws InterruptedException { |
533 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
534 |
lock.writeLock().lock(); |
535 |
lock.readLock().lock(); |
536 |
lock.readLock().unlock(); |
537 |
|
538 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
539 |
public void realRun() { |
540 |
lock.readLock().lock(); |
541 |
lock.readLock().unlock(); |
542 |
}}); |
543 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
544 |
public void realRun() { |
545 |
lock.readLock().lock(); |
546 |
lock.readLock().unlock(); |
547 |
}}); |
548 |
|
549 |
waitForQueuedThread(lock, t1); |
550 |
waitForQueuedThread(lock, t2); |
551 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
552 |
lock.readLock().lock(); |
553 |
lock.readLock().unlock(); |
554 |
releaseWriteLock(lock); |
555 |
awaitTermination(t1); |
556 |
awaitTermination(t2); |
557 |
} |
558 |
|
559 |
/** |
560 |
* Fair Read lock succeeds if write locked by current thread even if |
561 |
* other threads are waiting for writelock |
562 |
*/ |
563 |
public void testReadHoldingWriteLockFair3() throws InterruptedException { |
564 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
565 |
lock.writeLock().lock(); |
566 |
lock.readLock().lock(); |
567 |
lock.readLock().unlock(); |
568 |
|
569 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
570 |
public void realRun() { |
571 |
lock.writeLock().lock(); |
572 |
lock.writeLock().unlock(); |
573 |
}}); |
574 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
575 |
public void realRun() { |
576 |
lock.writeLock().lock(); |
577 |
lock.writeLock().unlock(); |
578 |
}}); |
579 |
|
580 |
waitForQueuedThread(lock, t1); |
581 |
waitForQueuedThread(lock, t2); |
582 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
583 |
lock.readLock().lock(); |
584 |
lock.readLock().unlock(); |
585 |
releaseWriteLock(lock); |
586 |
awaitTermination(t1); |
587 |
awaitTermination(t2); |
588 |
} |
589 |
|
590 |
/** |
591 |
* Fair Write lock succeeds if write locked by current thread even if |
592 |
* other threads are waiting for writelock |
593 |
*/ |
594 |
public void testWriteHoldingWriteLockFair4() throws InterruptedException { |
595 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
596 |
lock.writeLock().lock(); |
597 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
598 |
public void realRun() { |
599 |
lock.writeLock().lock(); |
600 |
lock.writeLock().unlock(); |
601 |
}}); |
602 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
603 |
public void realRun() { |
604 |
lock.writeLock().lock(); |
605 |
lock.writeLock().unlock(); |
606 |
}}); |
607 |
|
608 |
waitForQueuedThread(lock, t1); |
609 |
waitForQueuedThread(lock, t2); |
610 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
611 |
assertEquals(1, lock.getWriteHoldCount()); |
612 |
lock.writeLock().lock(); |
613 |
assertEquals(2, lock.getWriteHoldCount()); |
614 |
lock.writeLock().unlock(); |
615 |
lock.writeLock().lock(); |
616 |
lock.writeLock().unlock(); |
617 |
releaseWriteLock(lock); |
618 |
awaitTermination(t1); |
619 |
awaitTermination(t2); |
620 |
} |
621 |
|
622 |
/** |
623 |
* Read tryLock succeeds if readlocked but not writelocked |
624 |
*/ |
625 |
public void testTryLockWhenReadLocked() throws InterruptedException { |
626 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
627 |
lock.readLock().lock(); |
628 |
Thread t = newStartedThread(new CheckedRunnable() { |
629 |
public void realRun() { |
630 |
assertTrue(lock.readLock().tryLock()); |
631 |
lock.readLock().unlock(); |
632 |
}}); |
633 |
|
634 |
awaitTermination(t); |
635 |
lock.readLock().unlock(); |
636 |
} |
637 |
|
638 |
/** |
639 |
* write tryLock fails when readlocked |
640 |
*/ |
641 |
public void testWriteTryLockWhenReadLocked() throws InterruptedException { |
642 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
643 |
lock.readLock().lock(); |
644 |
Thread t = newStartedThread(new CheckedRunnable() { |
645 |
public void realRun() { |
646 |
assertFalse(lock.writeLock().tryLock()); |
647 |
}}); |
648 |
|
649 |
awaitTermination(t); |
650 |
lock.readLock().unlock(); |
651 |
} |
652 |
|
653 |
/** |
654 |
* Fair Read tryLock succeeds if readlocked but not writelocked |
655 |
*/ |
656 |
public void testTryLockWhenReadLockedFair() throws InterruptedException { |
657 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
658 |
lock.readLock().lock(); |
659 |
Thread t = newStartedThread(new CheckedRunnable() { |
660 |
public void realRun() { |
661 |
assertTrue(lock.readLock().tryLock()); |
662 |
lock.readLock().unlock(); |
663 |
}}); |
664 |
|
665 |
awaitTermination(t); |
666 |
lock.readLock().unlock(); |
667 |
} |
668 |
|
669 |
/** |
670 |
* Fair write tryLock fails when readlocked |
671 |
*/ |
672 |
public void testWriteTryLockWhenReadLockedFair() throws InterruptedException { |
673 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
674 |
lock.readLock().lock(); |
675 |
Thread t = newStartedThread(new CheckedRunnable() { |
676 |
public void realRun() { |
677 |
assertFalse(lock.writeLock().tryLock()); |
678 |
}}); |
679 |
|
680 |
awaitTermination(t); |
681 |
lock.readLock().unlock(); |
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 = newStartedThread(new CheckedRunnable() { |
691 |
public void realRun() throws InterruptedException { |
692 |
assertFalse(lock.writeLock().tryLock(1, MILLISECONDS)); |
693 |
}}); |
694 |
|
695 |
awaitTermination(t); |
696 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
697 |
lock.writeLock().unlock(); |
698 |
} |
699 |
|
700 |
/** |
701 |
* read timed tryLock times out if write-locked |
702 |
*/ |
703 |
public void testReadTryLock_Timeout() throws InterruptedException { |
704 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
705 |
lock.writeLock().lock(); |
706 |
Thread t = newStartedThread(new CheckedRunnable() { |
707 |
public void realRun() throws InterruptedException { |
708 |
assertFalse(lock.readLock().tryLock(1, MILLISECONDS)); |
709 |
}}); |
710 |
|
711 |
awaitTermination(t); |
712 |
assertTrue(lock.writeLock().isHeldByCurrentThread()); |
713 |
lock.writeLock().unlock(); |
714 |
} |
715 |
|
716 |
/** |
717 |
* write lockInterruptibly succeeds if lock free else is interruptible |
718 |
*/ |
719 |
public void testWriteLockInterruptibly() throws InterruptedException { |
720 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
721 |
lock.writeLock().lockInterruptibly(); |
722 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
723 |
public void realRun() throws InterruptedException { |
724 |
lock.writeLock().lockInterruptibly(); |
725 |
}}); |
726 |
|
727 |
waitForQueuedThread(lock, t); |
728 |
t.interrupt(); |
729 |
awaitTermination(t); |
730 |
releaseWriteLock(lock); |
731 |
} |
732 |
|
733 |
/** |
734 |
* read lockInterruptibly succeeds if lock free else is interruptible |
735 |
*/ |
736 |
public void testReadLockInterruptibly() throws InterruptedException { |
737 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
738 |
lock.writeLock().lockInterruptibly(); |
739 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
740 |
public void realRun() throws InterruptedException { |
741 |
lock.readLock().lockInterruptibly(); |
742 |
}}); |
743 |
|
744 |
waitForQueuedThread(lock, t); |
745 |
t.interrupt(); |
746 |
awaitTermination(t); |
747 |
releaseWriteLock(lock); |
748 |
} |
749 |
|
750 |
/** |
751 |
* Calling await without holding lock throws IllegalMonitorStateException |
752 |
*/ |
753 |
public void testAwait_IllegalMonitor() throws InterruptedException { |
754 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
755 |
final Condition c = lock.writeLock().newCondition(); |
756 |
try { |
757 |
c.await(); |
758 |
shouldThrow(); |
759 |
} catch (IllegalMonitorStateException success) {} |
760 |
try { |
761 |
c.await(LONG_DELAY_MS, MILLISECONDS); |
762 |
shouldThrow(); |
763 |
} catch (IllegalMonitorStateException success) {} |
764 |
try { |
765 |
c.awaitNanos(100); |
766 |
shouldThrow(); |
767 |
} catch (IllegalMonitorStateException success) {} |
768 |
try { |
769 |
c.awaitUninterruptibly(); |
770 |
shouldThrow(); |
771 |
} catch (IllegalMonitorStateException success) {} |
772 |
} |
773 |
|
774 |
/** |
775 |
* Calling signal without holding lock throws IllegalMonitorStateException |
776 |
*/ |
777 |
public void testSignal_IllegalMonitor() { |
778 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
779 |
final Condition c = lock.writeLock().newCondition(); |
780 |
try { |
781 |
c.signal(); |
782 |
shouldThrow(); |
783 |
} catch (IllegalMonitorStateException success) {} |
784 |
} |
785 |
|
786 |
/** |
787 |
* Calling signalAll without holding lock throws IllegalMonitorStateException |
788 |
*/ |
789 |
public void testSignalAll_IllegalMonitor() { |
790 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
791 |
final Condition c = lock.writeLock().newCondition(); |
792 |
try { |
793 |
c.signalAll(); |
794 |
shouldThrow(); |
795 |
} catch (IllegalMonitorStateException success) {} |
796 |
} |
797 |
|
798 |
/** |
799 |
* awaitNanos without a signal times out |
800 |
*/ |
801 |
public void testAwaitNanos_Timeout() throws InterruptedException { |
802 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
803 |
final Condition c = lock.writeLock().newCondition(); |
804 |
lock.writeLock().lock(); |
805 |
long startTime = System.nanoTime(); |
806 |
long timeoutMillis = 10; |
807 |
long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis); |
808 |
long nanosRemaining = c.awaitNanos(timeoutNanos); |
809 |
assertTrue(nanosRemaining <= 0); |
810 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
811 |
lock.writeLock().unlock(); |
812 |
} |
813 |
|
814 |
/** |
815 |
* timed await without a signal times out |
816 |
*/ |
817 |
public void testAwait_Timeout() throws InterruptedException { |
818 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
819 |
final Condition c = lock.writeLock().newCondition(); |
820 |
lock.writeLock().lock(); |
821 |
long startTime = System.nanoTime(); |
822 |
long timeoutMillis = 10; |
823 |
assertFalse(c.await(timeoutMillis, MILLISECONDS)); |
824 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
825 |
lock.writeLock().unlock(); |
826 |
} |
827 |
|
828 |
/** |
829 |
* awaitUntil without a signal times out |
830 |
*/ |
831 |
public void testAwaitUntil_Timeout() throws InterruptedException { |
832 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
833 |
final Condition c = lock.writeLock().newCondition(); |
834 |
lock.writeLock().lock(); |
835 |
java.util.Date d = new java.util.Date(); |
836 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
837 |
lock.writeLock().unlock(); |
838 |
} |
839 |
|
840 |
/** |
841 |
* await returns when signalled |
842 |
*/ |
843 |
public void testAwait() throws InterruptedException { |
844 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
845 |
final Condition c = lock.writeLock().newCondition(); |
846 |
final CountDownLatch locked = new CountDownLatch(1); |
847 |
Thread t = newStartedThread(new CheckedRunnable() { |
848 |
public void realRun() throws InterruptedException { |
849 |
lock.writeLock().lock(); |
850 |
locked.countDown(); |
851 |
c.await(); |
852 |
lock.writeLock().unlock(); |
853 |
}}); |
854 |
|
855 |
locked.await(); |
856 |
lock.writeLock().lock(); |
857 |
c.signal(); |
858 |
assertTrue(t.isAlive()); |
859 |
lock.writeLock().unlock(); |
860 |
awaitTermination(t); |
861 |
} |
862 |
|
863 |
/** |
864 |
* awaitUninterruptibly doesn't abort on interrupt |
865 |
*/ |
866 |
public void testAwaitUninterruptibly() throws InterruptedException { |
867 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
868 |
final Condition c = lock.writeLock().newCondition(); |
869 |
final CountDownLatch locked = new CountDownLatch(1); |
870 |
final AtomicBoolean canAwake = new AtomicBoolean(false); |
871 |
Thread t = newStartedThread(new CheckedRunnable() { |
872 |
public void realRun() { |
873 |
lock.writeLock().lock(); |
874 |
locked.countDown(); |
875 |
c.awaitUninterruptibly(); |
876 |
assertTrue(Thread.interrupted()); |
877 |
lock.writeLock().unlock(); |
878 |
}}); |
879 |
|
880 |
locked.await(); |
881 |
lock.writeLock().lock(); |
882 |
lock.writeLock().unlock(); |
883 |
t.interrupt(); |
884 |
t.join(10); |
885 |
assertTrue(t.isAlive()); |
886 |
lock.writeLock().lock(); |
887 |
c.signal(); |
888 |
lock.writeLock().unlock(); |
889 |
awaitTermination(t); |
890 |
} |
891 |
|
892 |
/** |
893 |
* await is interruptible |
894 |
*/ |
895 |
public void testAwait_Interrupt() throws InterruptedException { |
896 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
897 |
final Condition c = lock.writeLock().newCondition(); |
898 |
final CountDownLatch locked = new CountDownLatch(1); |
899 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
900 |
public void realRun() throws InterruptedException { |
901 |
lock.writeLock().lock(); |
902 |
assertTrue(lock.isWriteLocked()); |
903 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
904 |
assertHasNoWaiters(lock, c); |
905 |
locked.countDown(); |
906 |
try { |
907 |
c.await(); |
908 |
} finally { |
909 |
assertTrue(lock.isWriteLocked()); |
910 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
911 |
assertHasNoWaiters(lock, c); |
912 |
lock.writeLock().unlock(); |
913 |
assertFalse(Thread.interrupted()); |
914 |
} |
915 |
}}); |
916 |
|
917 |
locked.await(); |
918 |
assertHasWaiters(lock, c, t); |
919 |
t.interrupt(); |
920 |
awaitTermination(t); |
921 |
assertFalse(lock.isWriteLocked()); |
922 |
} |
923 |
|
924 |
/** |
925 |
* awaitNanos is interruptible |
926 |
*/ |
927 |
public void testAwaitNanos_Interrupt() throws InterruptedException { |
928 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
929 |
final Condition c = lock.writeLock().newCondition(); |
930 |
final CountDownLatch locked = new CountDownLatch(1); |
931 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
932 |
public void realRun() throws InterruptedException { |
933 |
lock.writeLock().lock(); |
934 |
assertTrue(lock.isWriteLocked()); |
935 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
936 |
assertHasNoWaiters(lock, c); |
937 |
locked.countDown(); |
938 |
try { |
939 |
c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS)); |
940 |
} finally { |
941 |
assertTrue(lock.isWriteLocked()); |
942 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
943 |
assertHasNoWaiters(lock, c); |
944 |
lock.writeLock().unlock(); |
945 |
assertFalse(Thread.interrupted()); |
946 |
} |
947 |
}}); |
948 |
|
949 |
locked.await(); |
950 |
assertHasWaiters(lock, c, t); |
951 |
t.interrupt(); |
952 |
awaitTermination(t); |
953 |
assertFalse(lock.isWriteLocked()); |
954 |
} |
955 |
|
956 |
/** |
957 |
* awaitUntil is interruptible |
958 |
*/ |
959 |
public void testAwaitUntil_Interrupt() throws InterruptedException { |
960 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
961 |
final Condition c = lock.writeLock().newCondition(); |
962 |
final CountDownLatch locked = new CountDownLatch(1); |
963 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
964 |
public void realRun() throws InterruptedException { |
965 |
lock.writeLock().lock(); |
966 |
assertTrue(lock.isWriteLocked()); |
967 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
968 |
assertHasNoWaiters(lock, c); |
969 |
locked.countDown(); |
970 |
java.util.Date d = new java.util.Date(); |
971 |
try { |
972 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
973 |
} finally { |
974 |
assertTrue(lock.isWriteLocked()); |
975 |
assertTrue(lock.isWriteLockedByCurrentThread()); |
976 |
assertHasNoWaiters(lock, c); |
977 |
lock.writeLock().unlock(); |
978 |
assertFalse(Thread.interrupted()); |
979 |
} |
980 |
}}); |
981 |
|
982 |
locked.await(); |
983 |
assertHasWaiters(lock, c, t); |
984 |
t.interrupt(); |
985 |
awaitTermination(t); |
986 |
assertFalse(lock.isWriteLocked()); |
987 |
} |
988 |
|
989 |
/** |
990 |
* signalAll wakes up all threads |
991 |
*/ |
992 |
public void testSignalAll() throws InterruptedException { |
993 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
994 |
final Condition c = lock.writeLock().newCondition(); |
995 |
final CountDownLatch locked = new CountDownLatch(2); |
996 |
final Lock writeLock = lock.writeLock(); |
997 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
998 |
public void realRun() throws InterruptedException { |
999 |
writeLock.lock(); |
1000 |
locked.countDown(); |
1001 |
c.await(); |
1002 |
writeLock.unlock(); |
1003 |
}}); |
1004 |
|
1005 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
1006 |
public void realRun() throws InterruptedException { |
1007 |
writeLock.lock(); |
1008 |
locked.countDown(); |
1009 |
c.await(); |
1010 |
writeLock.unlock(); |
1011 |
}}); |
1012 |
|
1013 |
locked.await(); |
1014 |
writeLock.lock(); |
1015 |
assertHasWaiters(lock, c, t1, t2); |
1016 |
c.signalAll(); |
1017 |
assertHasNoWaiters(lock, c); |
1018 |
writeLock.unlock(); |
1019 |
awaitTermination(t1); |
1020 |
awaitTermination(t2); |
1021 |
} |
1022 |
|
1023 |
/** |
1024 |
* signal wakes up waiting threads in FIFO order. |
1025 |
*/ |
1026 |
public void testSignalWakesFifo() throws InterruptedException { |
1027 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1028 |
final Condition c = lock.writeLock().newCondition(); |
1029 |
final CountDownLatch locked1 = new CountDownLatch(1); |
1030 |
final CountDownLatch locked2 = new CountDownLatch(1); |
1031 |
final Lock writeLock = lock.writeLock(); |
1032 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
1033 |
public void realRun() throws InterruptedException { |
1034 |
writeLock.lock(); |
1035 |
locked1.countDown(); |
1036 |
c.await(); |
1037 |
writeLock.unlock(); |
1038 |
}}); |
1039 |
|
1040 |
locked1.await(); |
1041 |
|
1042 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
1043 |
public void realRun() throws InterruptedException { |
1044 |
writeLock.lock(); |
1045 |
locked2.countDown(); |
1046 |
c.await(); |
1047 |
writeLock.unlock(); |
1048 |
}}); |
1049 |
|
1050 |
locked2.await(); |
1051 |
|
1052 |
writeLock.lock(); |
1053 |
assertHasWaiters(lock, c, t1, t2); |
1054 |
assertFalse(lock.hasQueuedThreads()); |
1055 |
c.signal(); |
1056 |
assertHasWaiters(lock, c, t2); |
1057 |
assertTrue(lock.hasQueuedThread(t1)); |
1058 |
assertFalse(lock.hasQueuedThread(t2)); |
1059 |
c.signal(); |
1060 |
assertHasNoWaiters(lock, c); |
1061 |
assertTrue(lock.hasQueuedThread(t1)); |
1062 |
assertTrue(lock.hasQueuedThread(t2)); |
1063 |
writeLock.unlock(); |
1064 |
awaitTermination(t1); |
1065 |
awaitTermination(t2); |
1066 |
} |
1067 |
|
1068 |
/** |
1069 |
* A serialized lock deserializes as unlocked |
1070 |
*/ |
1071 |
public void testSerialization() throws Exception { |
1072 |
ReentrantReadWriteLock l = new ReentrantReadWriteLock(); |
1073 |
l.readLock().lock(); |
1074 |
l.readLock().unlock(); |
1075 |
|
1076 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
1077 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
1078 |
out.writeObject(l); |
1079 |
out.close(); |
1080 |
|
1081 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
1082 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
1083 |
ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject(); |
1084 |
r.readLock().lock(); |
1085 |
r.readLock().unlock(); |
1086 |
} |
1087 |
|
1088 |
/** |
1089 |
* hasQueuedThreads reports whether there are waiting threads |
1090 |
*/ |
1091 |
public void testhasQueuedThreads() throws InterruptedException { |
1092 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1093 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1094 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1095 |
assertFalse(lock.hasQueuedThreads()); |
1096 |
lock.writeLock().lock(); |
1097 |
assertFalse(lock.hasQueuedThreads()); |
1098 |
long startTime = System.nanoTime(); |
1099 |
t1.start(); |
1100 |
waitForQueuedThread(lock, t1); |
1101 |
t2.start(); |
1102 |
waitForQueuedThread(lock, t2); |
1103 |
assertTrue(lock.hasQueuedThreads()); |
1104 |
t1.interrupt(); |
1105 |
awaitTermination(t1); |
1106 |
assertTrue(lock.hasQueuedThreads()); |
1107 |
lock.writeLock().unlock(); |
1108 |
awaitTermination(t2); |
1109 |
assertFalse(lock.hasQueuedThreads()); |
1110 |
} |
1111 |
|
1112 |
/** |
1113 |
* hasQueuedThread(null) throws NPE |
1114 |
*/ |
1115 |
public void testHasQueuedThreadNPE() { |
1116 |
final ReentrantReadWriteLock sync = new ReentrantReadWriteLock(); |
1117 |
try { |
1118 |
sync.hasQueuedThread(null); |
1119 |
shouldThrow(); |
1120 |
} catch (NullPointerException success) {} |
1121 |
} |
1122 |
|
1123 |
/** |
1124 |
* hasQueuedThread reports whether a thread is queued. |
1125 |
*/ |
1126 |
public void testHasQueuedThread() throws InterruptedException { |
1127 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1128 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1129 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1130 |
assertFalse(lock.hasQueuedThread(t1)); |
1131 |
assertFalse(lock.hasQueuedThread(t2)); |
1132 |
lock.writeLock().lock(); |
1133 |
long startTime = System.nanoTime(); |
1134 |
t1.start(); |
1135 |
waitForQueuedThread(lock, t1); |
1136 |
assertTrue(lock.hasQueuedThread(t1)); |
1137 |
assertFalse(lock.hasQueuedThread(t2)); |
1138 |
t2.start(); |
1139 |
waitForQueuedThread(lock, t2); |
1140 |
assertTrue(lock.hasQueuedThread(t1)); |
1141 |
assertTrue(lock.hasQueuedThread(t2)); |
1142 |
t1.interrupt(); |
1143 |
awaitTermination(t1); |
1144 |
assertFalse(lock.hasQueuedThread(t1)); |
1145 |
assertTrue(lock.hasQueuedThread(t2)); |
1146 |
lock.writeLock().unlock(); |
1147 |
awaitTermination(t2); |
1148 |
assertFalse(lock.hasQueuedThread(t1)); |
1149 |
assertFalse(lock.hasQueuedThread(t2)); |
1150 |
} |
1151 |
|
1152 |
/** |
1153 |
* getQueueLength reports number of waiting threads |
1154 |
*/ |
1155 |
public void testGetQueueLength() throws InterruptedException { |
1156 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1157 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1158 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1159 |
assertEquals(0, lock.getQueueLength()); |
1160 |
lock.writeLock().lock(); |
1161 |
long startTime = System.nanoTime(); |
1162 |
t1.start(); |
1163 |
waitForQueuedThread(lock, t1); |
1164 |
assertEquals(1, lock.getQueueLength()); |
1165 |
t2.start(); |
1166 |
waitForQueuedThread(lock, t2); |
1167 |
assertEquals(2, lock.getQueueLength()); |
1168 |
t1.interrupt(); |
1169 |
awaitTermination(t1); |
1170 |
assertEquals(1, lock.getQueueLength()); |
1171 |
lock.writeLock().unlock(); |
1172 |
awaitTermination(t2); |
1173 |
assertEquals(0, lock.getQueueLength()); |
1174 |
} |
1175 |
|
1176 |
/** |
1177 |
* getQueuedThreads includes waiting threads |
1178 |
*/ |
1179 |
public void testGetQueuedThreads() throws InterruptedException { |
1180 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1181 |
Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
1182 |
Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
1183 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1184 |
lock.writeLock().lock(); |
1185 |
long startTime = System.nanoTime(); |
1186 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1187 |
t1.start(); |
1188 |
waitForQueuedThread(lock, t1); |
1189 |
assertEquals(1, lock.getQueuedThreads().size()); |
1190 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1191 |
t2.start(); |
1192 |
waitForQueuedThread(lock, t2); |
1193 |
assertEquals(2, lock.getQueuedThreads().size()); |
1194 |
assertTrue(lock.getQueuedThreads().contains(t1)); |
1195 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1196 |
t1.interrupt(); |
1197 |
awaitTermination(t1); |
1198 |
assertFalse(lock.getQueuedThreads().contains(t1)); |
1199 |
assertTrue(lock.getQueuedThreads().contains(t2)); |
1200 |
assertEquals(1, lock.getQueuedThreads().size()); |
1201 |
lock.writeLock().unlock(); |
1202 |
awaitTermination(t2); |
1203 |
assertTrue(lock.getQueuedThreads().isEmpty()); |
1204 |
} |
1205 |
|
1206 |
/** |
1207 |
* hasWaiters throws NPE if null |
1208 |
*/ |
1209 |
public void testHasWaitersNPE() { |
1210 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1211 |
try { |
1212 |
lock.hasWaiters(null); |
1213 |
shouldThrow(); |
1214 |
} catch (NullPointerException success) {} |
1215 |
} |
1216 |
|
1217 |
/** |
1218 |
* getWaitQueueLength throws NPE if null |
1219 |
*/ |
1220 |
public void testGetWaitQueueLengthNPE() { |
1221 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1222 |
try { |
1223 |
lock.getWaitQueueLength(null); |
1224 |
shouldThrow(); |
1225 |
} catch (NullPointerException success) {} |
1226 |
} |
1227 |
|
1228 |
/** |
1229 |
* getWaitingThreads throws NPE if null |
1230 |
*/ |
1231 |
public void testGetWaitingThreadsNPE() { |
1232 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1233 |
try { |
1234 |
lock.getWaitingThreads(null); |
1235 |
shouldThrow(); |
1236 |
} catch (NullPointerException success) {} |
1237 |
} |
1238 |
|
1239 |
/** |
1240 |
* hasWaiters throws IAE if not owned |
1241 |
*/ |
1242 |
public void testHasWaitersIAE() { |
1243 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1244 |
final Condition c = lock.writeLock().newCondition(); |
1245 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1246 |
try { |
1247 |
lock2.hasWaiters(c); |
1248 |
shouldThrow(); |
1249 |
} catch (IllegalArgumentException success) {} |
1250 |
} |
1251 |
|
1252 |
/** |
1253 |
* hasWaiters throws IMSE if not locked |
1254 |
*/ |
1255 |
public void testHasWaitersIMSE() { |
1256 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1257 |
final Condition c = lock.writeLock().newCondition(); |
1258 |
try { |
1259 |
lock.hasWaiters(c); |
1260 |
shouldThrow(); |
1261 |
} catch (IllegalMonitorStateException success) {} |
1262 |
} |
1263 |
|
1264 |
/** |
1265 |
* getWaitQueueLength throws IAE if not owned |
1266 |
*/ |
1267 |
public void testGetWaitQueueLengthIAE() { |
1268 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1269 |
final Condition c = lock.writeLock().newCondition(); |
1270 |
final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(); |
1271 |
try { |
1272 |
lock2.getWaitQueueLength(c); |
1273 |
shouldThrow(); |
1274 |
} catch (IllegalArgumentException success) {} |
1275 |
} |
1276 |
|
1277 |
/** |
1278 |
* getWaitQueueLength throws IMSE if not locked |
1279 |
*/ |
1280 |
public void testGetWaitQueueLengthIMSE() { |
1281 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1282 |
final Condition c = lock.writeLock().newCondition(); |
1283 |
try { |
1284 |
lock.getWaitQueueLength(c); |
1285 |
shouldThrow(); |
1286 |
} catch (IllegalMonitorStateException success) {} |
1287 |
} |
1288 |
|
1289 |
/** |
1290 |
* getWaitingThreads throws IAE if not owned |
1291 |
*/ |
1292 |
public void testGetWaitingThreadsIAE() { |
1293 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1294 |
final Condition c = lock.writeLock().newCondition(); |
1295 |
final PublicReentrantReadWriteLock lock2 = new PublicReentrantReadWriteLock(); |
1296 |
try { |
1297 |
lock2.getWaitingThreads(c); |
1298 |
shouldThrow(); |
1299 |
} catch (IllegalArgumentException success) {} |
1300 |
} |
1301 |
|
1302 |
/** |
1303 |
* getWaitingThreads throws IMSE if not locked |
1304 |
*/ |
1305 |
public void testGetWaitingThreadsIMSE() { |
1306 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1307 |
final Condition c = lock.writeLock().newCondition(); |
1308 |
try { |
1309 |
lock.getWaitingThreads(c); |
1310 |
shouldThrow(); |
1311 |
} catch (IllegalMonitorStateException success) {} |
1312 |
} |
1313 |
|
1314 |
/** |
1315 |
* hasWaiters returns true when a thread is waiting, else false |
1316 |
*/ |
1317 |
public void testHasWaiters() throws InterruptedException { |
1318 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1319 |
final Condition c = lock.writeLock().newCondition(); |
1320 |
final CountDownLatch locked = new CountDownLatch(1); |
1321 |
Thread t = newStartedThread(new CheckedRunnable() { |
1322 |
public void realRun() throws InterruptedException { |
1323 |
lock.writeLock().lock(); |
1324 |
assertFalse(lock.hasWaiters(c)); |
1325 |
locked.countDown(); |
1326 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1327 |
c.await(); |
1328 |
lock.writeLock().unlock(); |
1329 |
}}); |
1330 |
|
1331 |
locked.await(); |
1332 |
lock.writeLock().lock(); |
1333 |
assertTrue(lock.hasWaiters(c)); |
1334 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1335 |
c.signal(); |
1336 |
assertHasNoWaiters(lock, c); |
1337 |
lock.writeLock().unlock(); |
1338 |
awaitTermination(t); |
1339 |
assertHasNoWaiters(lock, c); |
1340 |
} |
1341 |
|
1342 |
/** |
1343 |
* getWaitQueueLength returns number of waiting threads |
1344 |
*/ |
1345 |
public void testGetWaitQueueLength() throws InterruptedException { |
1346 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1347 |
final Condition c = lock.writeLock().newCondition(); |
1348 |
final CountDownLatch locked = new CountDownLatch(1); |
1349 |
Thread t = newStartedThread(new CheckedRunnable() { |
1350 |
public void realRun() throws InterruptedException { |
1351 |
lock.writeLock().lock(); |
1352 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1353 |
locked.countDown(); |
1354 |
c.await(); |
1355 |
lock.writeLock().unlock(); |
1356 |
}}); |
1357 |
|
1358 |
locked.await(); |
1359 |
lock.writeLock().lock(); |
1360 |
assertHasWaiters(lock, c, t); |
1361 |
assertEquals(1, lock.getWaitQueueLength(c)); |
1362 |
c.signal(); |
1363 |
assertHasNoWaiters(lock, c); |
1364 |
assertEquals(0, lock.getWaitQueueLength(c)); |
1365 |
lock.writeLock().unlock(); |
1366 |
awaitTermination(t); |
1367 |
} |
1368 |
|
1369 |
/** |
1370 |
* getWaitingThreads returns only and all waiting threads |
1371 |
*/ |
1372 |
public void testGetWaitingThreads() throws InterruptedException { |
1373 |
final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); |
1374 |
final Condition c = lock.writeLock().newCondition(); |
1375 |
final CountDownLatch locked1 = new CountDownLatch(1); |
1376 |
final CountDownLatch locked2 = new CountDownLatch(1); |
1377 |
Thread t1 = new Thread(new CheckedRunnable() { |
1378 |
public void realRun() throws InterruptedException { |
1379 |
lock.writeLock().lock(); |
1380 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1381 |
locked1.countDown(); |
1382 |
c.await(); |
1383 |
lock.writeLock().unlock(); |
1384 |
}}); |
1385 |
|
1386 |
Thread t2 = new Thread(new CheckedRunnable() { |
1387 |
public void realRun() throws InterruptedException { |
1388 |
lock.writeLock().lock(); |
1389 |
assertFalse(lock.getWaitingThreads(c).isEmpty()); |
1390 |
locked2.countDown(); |
1391 |
c.await(); |
1392 |
lock.writeLock().unlock(); |
1393 |
}}); |
1394 |
|
1395 |
lock.writeLock().lock(); |
1396 |
assertTrue(lock.getWaitingThreads(c).isEmpty()); |
1397 |
lock.writeLock().unlock(); |
1398 |
|
1399 |
t1.start(); |
1400 |
locked1.await(); |
1401 |
t2.start(); |
1402 |
locked2.await(); |
1403 |
|
1404 |
lock.writeLock().lock(); |
1405 |
assertTrue(lock.hasWaiters(c)); |
1406 |
assertTrue(lock.getWaitingThreads(c).contains(t1)); |
1407 |
assertTrue(lock.getWaitingThreads(c).contains(t2)); |
1408 |
assertEquals(2, lock.getWaitingThreads(c).size()); |
1409 |
c.signalAll(); |
1410 |
assertHasNoWaiters(lock, c); |
1411 |
lock.writeLock().unlock(); |
1412 |
|
1413 |
awaitTermination(t1); |
1414 |
awaitTermination(t2); |
1415 |
|
1416 |
assertHasNoWaiters(lock, c); |
1417 |
} |
1418 |
|
1419 |
/** |
1420 |
* toString indicates current lock state |
1421 |
*/ |
1422 |
public void testToString() { |
1423 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1424 |
String us = lock.toString(); |
1425 |
assertTrue(us.indexOf("Write locks = 0") >= 0); |
1426 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1427 |
lock.writeLock().lock(); |
1428 |
String ws = lock.toString(); |
1429 |
assertTrue(ws.indexOf("Write locks = 1") >= 0); |
1430 |
assertTrue(ws.indexOf("Read locks = 0") >= 0); |
1431 |
lock.writeLock().unlock(); |
1432 |
lock.readLock().lock(); |
1433 |
lock.readLock().lock(); |
1434 |
String rs = lock.toString(); |
1435 |
assertTrue(rs.indexOf("Write locks = 0") >= 0); |
1436 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1437 |
} |
1438 |
|
1439 |
/** |
1440 |
* readLock.toString indicates current lock state |
1441 |
*/ |
1442 |
public void testReadLockToString() { |
1443 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1444 |
String us = lock.readLock().toString(); |
1445 |
assertTrue(us.indexOf("Read locks = 0") >= 0); |
1446 |
lock.readLock().lock(); |
1447 |
lock.readLock().lock(); |
1448 |
String rs = lock.readLock().toString(); |
1449 |
assertTrue(rs.indexOf("Read locks = 2") >= 0); |
1450 |
} |
1451 |
|
1452 |
/** |
1453 |
* writeLock.toString indicates current lock state |
1454 |
*/ |
1455 |
public void testWriteLockToString() { |
1456 |
ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
1457 |
String us = lock.writeLock().toString(); |
1458 |
assertTrue(us.indexOf("Unlocked") >= 0); |
1459 |
lock.writeLock().lock(); |
1460 |
String ls = lock.writeLock().toString(); |
1461 |
assertTrue(ls.indexOf("Locked") >= 0); |
1462 |
} |
1463 |
|
1464 |
} |