--- jsr166/src/test/tck/ReentrantReadWriteLockTest.java 2003/09/07 20:39:11 1.2 +++ jsr166/src/test/tck/ReentrantReadWriteLockTest.java 2003/11/10 13:32:08 1.6 @@ -9,48 +9,167 @@ import junit.framework.*; import java.util.concurrent.locks.*; import java.util.concurrent.*; import java.io.*; +import java.util.*; -public class ReentrantReadWriteLockTest extends TestCase { - static int HOLD_COUNT_TEST_LIMIT = 20; - +public class ReentrantReadWriteLockTest extends JSR166TestCase { public static void main(String[] args) { junit.textui.TestRunner.run (suite()); } - public static Test suite() { return new TestSuite(ReentrantReadWriteLockTest.class); } + /** + * A runnable calling lockInterruptibly + */ + class InterruptibleLockRunnable implements Runnable { + final ReentrantReadWriteLock lock; + InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; } + public void run() { + try { + lock.writeLock().lockInterruptibly(); + } catch(InterruptedException success){} + } + } + - private static long SHORT_DELAY_MS = 100; - private static long MEDIUM_DELAY_MS = 1000; - private static long LONG_DELAY_MS = 10000; - - /* - * Unlocks an unlocked lock, throws Illegal Monitor State - * + /** + * A runnable calling lockInterruptibly that expects to be + * interrupted */ - - public void testIllegalMonitorStateException(){ + class InterruptedLockRunnable implements Runnable { + final ReentrantReadWriteLock lock; + InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; } + public void run() { + try { + lock.writeLock().lockInterruptibly(); + threadShouldThrow(); + } catch(InterruptedException success){} + } + } + + /** + * Subclass to expose protected methods + */ + static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock { + PublicReentrantReadWriteLock() { super(); } + public Collection getQueuedThreads() { + return super.getQueuedThreads(); + } + public WriterConditionObject newCondition() { + return new PublicCondition(this); + } + + static class PublicCondition extends ReentrantReadWriteLock.WriterConditionObject { + PublicCondition(PublicReentrantReadWriteLock l) { super(l); } + public Collection getWaitingThreads() { + return super.getWaitingThreads(); + } + } + + } + + /** + * Constructor sets given fairness, and is in unlocked state + */ + public void testConstructor() { ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); - try{ - rl.writeLock().unlock(); - fail("Should of thown Illegal Monitor State Exception"); + assertFalse(rl.isFair()); + assertFalse(rl.isWriteLocked()); + assertEquals(0, rl.getReadLocks()); + ReentrantReadWriteLock r2 = new ReentrantReadWriteLock(true); + assertTrue(r2.isFair()); + assertFalse(r2.isWriteLocked()); + assertEquals(0, r2.getReadLocks()); + } + + /** + * write-locking and read-locking an unlocked lock succeed + */ + public void testLock() { + ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); + rl.writeLock().lock(); + assertTrue(rl.isWriteLocked()); + assertTrue(rl.isWriteLockedByCurrentThread()); + assertEquals(0, rl.getReadLocks()); + rl.writeLock().unlock(); + assertFalse(rl.isWriteLocked()); + assertFalse(rl.isWriteLockedByCurrentThread()); + assertEquals(0, rl.getReadLocks()); + rl.readLock().lock(); + assertFalse(rl.isWriteLocked()); + assertFalse(rl.isWriteLockedByCurrentThread()); + assertEquals(1, rl.getReadLocks()); + rl.readLock().unlock(); + assertFalse(rl.isWriteLocked()); + assertFalse(rl.isWriteLockedByCurrentThread()); + assertEquals(0, rl.getReadLocks()); + } + + + /** + * locking an unlocked fair lock succeeds + */ + public void testFairLock() { + ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true); + rl.writeLock().lock(); + assertTrue(rl.isWriteLocked()); + assertTrue(rl.isWriteLockedByCurrentThread()); + assertEquals(0, rl.getReadLocks()); + rl.writeLock().unlock(); + assertFalse(rl.isWriteLocked()); + assertFalse(rl.isWriteLockedByCurrentThread()); + assertEquals(0, rl.getReadLocks()); + rl.readLock().lock(); + assertFalse(rl.isWriteLocked()); + assertFalse(rl.isWriteLockedByCurrentThread()); + assertEquals(1, rl.getReadLocks()); + rl.readLock().unlock(); + assertFalse(rl.isWriteLocked()); + assertFalse(rl.isWriteLockedByCurrentThread()); + assertEquals(0, rl.getReadLocks()); + } - }catch(IllegalMonitorStateException success){} + /** + * getWriteHoldCount returns number of recursive holds + */ + public void testGetHoldCount() { + ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); + for(int i = 1; i <= SIZE; i++) { + lock.writeLock().lock(); + assertEquals(i,lock.getWriteHoldCount()); + } + for(int i = SIZE; i > 0; i--) { + lock.writeLock().unlock(); + assertEquals(i-1,lock.getWriteHoldCount()); + } } + + /** + * write-unlocking an unlocked lock throws IllegalMonitorStateException + */ + public void testUnlock_IllegalMonitorStateException() { + ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); + try { + rl.writeLock().unlock(); + shouldThrow(); + } catch(IllegalMonitorStateException success){} + } - public void testInterruptedException(){ + /** + * write-lockInterruptibly is interruptible + */ + public void testWriteLockInterruptibly_Interrupted() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - try{ + public void run() { + try { lock.writeLock().lockInterruptibly(); - fail("should throw"); - }catch(InterruptedException success){} + threadShouldThrow(); + } catch(InterruptedException success){} } }); try { @@ -59,19 +178,22 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); t.join(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testInterruptedException2(){ + /** + * timed write-trylock is interruptible + */ + public void testWriteTryLock_Interrupted() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - try{ + public void run() { + try { lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS); - fail("should throw"); - }catch(InterruptedException success){} + threadShouldThrow(); + } catch(InterruptedException success){} } }); try { @@ -80,19 +202,22 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); t.join(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testInterruptedException3(){ + /** + * read-lockInterruptibly is interruptible + */ + public void testReadLockInterruptibly_Interrupted() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - try{ + public void run() { + try { lock.readLock().lockInterruptibly(); - fail("should throw"); - }catch(InterruptedException success){} + threadShouldThrow(); + } catch(InterruptedException success){} } }); try { @@ -101,19 +226,22 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); t.join(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testInterruptedException4(){ + /** + * timed read-trylock is interruptible + */ + public void testReadTryLock_Interrupted() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - try{ + public void run() { + try { lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS); - fail("should throw"); - }catch(InterruptedException success){} + threadShouldThrow(); + } catch(InterruptedException success){} } }); try { @@ -121,17 +249,20 @@ public class ReentrantReadWriteLockTest t.interrupt(); t.join(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testTryLockWhenLocked() { + /** + * write-trylock fails if locked + */ + public void testWriteTryLockWhenLocked() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - assertFalse(lock.writeLock().tryLock()); + public void run() { + threadAssertFalse(lock.writeLock().tryLock()); } }); try { @@ -139,16 +270,19 @@ public class ReentrantReadWriteLockTest t.join(); lock.writeLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testTryLockWhenLocked2() { + /** + * read-trylock fails if locked + */ + public void testReadTryLockWhenLocked() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - assertFalse(lock.readLock().tryLock()); + public void run() { + threadAssertFalse(lock.readLock().tryLock()); } }); try { @@ -156,16 +290,19 @@ public class ReentrantReadWriteLockTest t.join(); lock.writeLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } + /** + * Multiple threads can hold a read lock when not write-locked + */ public void testMultipleReadLocks() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.readLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - assertTrue(lock.readLock().tryLock()); + public void run() { + threadAssertTrue(lock.readLock().tryLock()); lock.readLock().unlock(); } }); @@ -174,21 +311,24 @@ public class ReentrantReadWriteLockTest t.join(); lock.readLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } + /** + * A writelock succeeds after reading threads unlock + */ public void testWriteAfterMultipleReadLocks() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.readLock().lock(); Thread t1 = new Thread(new Runnable() { - public void run(){ + public void run() { lock.readLock().lock(); lock.readLock().unlock(); } }); Thread t2 = new Thread(new Runnable() { - public void run(){ + public void run() { lock.writeLock().lock(); lock.writeLock().unlock(); } @@ -205,21 +345,24 @@ public class ReentrantReadWriteLockTest assertTrue(!t2.isAlive()); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } + /** + * Readlocks succeed after a writing thread unlocks + */ public void testReadAfterWriteLock() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t1 = new Thread(new Runnable() { - public void run(){ + public void run() { lock.readLock().lock(); lock.readLock().unlock(); } }); Thread t2 = new Thread(new Runnable() { - public void run(){ + public void run() { lock.readLock().lock(); lock.readLock().unlock(); } @@ -236,17 +379,20 @@ public class ReentrantReadWriteLockTest assertTrue(!t2.isAlive()); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } + /** + * Read trylock succeeds if readlocked but not writelocked + */ public void testTryLockWhenReadLocked() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.readLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - assertTrue(lock.readLock().tryLock()); + public void run() { + threadAssertTrue(lock.readLock().tryLock()); lock.readLock().unlock(); } }); @@ -255,18 +401,21 @@ public class ReentrantReadWriteLockTest t.join(); lock.readLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } + /** + * write trylock fails when readlocked + */ public void testWriteTryLockWhenReadLocked() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.readLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ - assertFalse(lock.writeLock().tryLock()); + public void run() { + threadAssertFalse(lock.writeLock().tryLock()); } }); try { @@ -274,21 +423,24 @@ public class ReentrantReadWriteLockTest t.join(); lock.readLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testTryLock_Timeout(){ + /** + * write timed trylock times out if locked + */ + public void testWriteTryLock_Timeout() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ + public void run() { try { - assertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS)); + threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS)); } catch (Exception ex) { - fail("unexpected exception"); + threadUnexpectedException(); } } }); @@ -297,19 +449,22 @@ public class ReentrantReadWriteLockTest t.join(); lock.writeLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testTryLock_Timeout2(){ + /** + * read timed trylock times out if write-locked + */ + public void testReadTryLock_Timeout() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); lock.writeLock().lock(); Thread t = new Thread(new Runnable() { - public void run(){ + public void run() { try { - assertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS)); + threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS)); } catch (Exception ex) { - fail("unexpected exception"); + threadUnexpectedException(); } } }); @@ -318,23 +473,26 @@ public class ReentrantReadWriteLockTest t.join(); lock.writeLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testLockInterruptibly() { + /** + * write lockInterruptibly succeeds if lock free else is interruptible + */ + public void testWriteLockInterruptibly() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); try { lock.writeLock().lockInterruptibly(); } catch(Exception e) { - fail("unexpected exception"); + unexpectedException(); } Thread t = new Thread(new Runnable() { public void run() { try { lock.writeLock().lockInterruptibly(); - fail("should throw"); + threadShouldThrow(); } catch(InterruptedException success) { } @@ -346,22 +504,25 @@ public class ReentrantReadWriteLockTest t.join(); lock.writeLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } - public void testLockInterruptibly2() { + /** + * read lockInterruptibly succeeds if lock free else is interruptible + */ + public void testReadLockInterruptibly() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); try { lock.writeLock().lockInterruptibly(); } catch(Exception e) { - fail("unexpected exception"); + unexpectedException(); } Thread t = new Thread(new Runnable() { public void run() { try { lock.readLock().lockInterruptibly(); - fail("should throw"); + threadShouldThrow(); } catch(InterruptedException success) { } @@ -373,38 +534,47 @@ public class ReentrantReadWriteLockTest t.join(); lock.writeLock().unlock(); } catch(Exception e){ - fail("unexpected exception"); + unexpectedException(); } } + /** + * Calling await without holding lock throws IllegalMonitorStateException + */ public void testAwait_IllegalMonitor() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); try { c.await(); - fail("should throw"); + shouldThrow(); } catch (IllegalMonitorStateException success) { } catch (Exception ex) { - fail("should throw IMSE"); + shouldThrow(); } } + /** + * Calling signal without holding lock throws IllegalMonitorStateException + */ public void testSignal_IllegalMonitor() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); try { c.signal(); - fail("should throw"); + shouldThrow(); } catch (IllegalMonitorStateException success) { } catch (Exception ex) { - fail("should throw IMSE"); + unexpectedException(); } } + /** + * awaitNanos without a signal times out + */ public void testAwaitNanos_Timeout() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -415,10 +585,14 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + + /** + * timed await without a signal times out + */ public void testAwait_Timeout() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -428,10 +602,13 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * awaitUntil without a signal times out + */ public void testAwaitUntil_Timeout() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -442,10 +619,13 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * await returns when signalled + */ public void testAwait() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -457,7 +637,7 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); } catch(InterruptedException e) { - fail("unexpected exception"); + threadUnexpectedException(); } } }); @@ -472,10 +652,13 @@ public class ReentrantReadWriteLockTest assertFalse(t.isAlive()); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * awaitUninterruptibly doesn't abort on interrupt + */ public void testAwaitUninterruptibly() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -494,14 +677,18 @@ public class ReentrantReadWriteLockTest lock.writeLock().lock(); c.signal(); lock.writeLock().unlock(); + assert(t.isInterrupted()); t.join(SHORT_DELAY_MS); assertFalse(t.isAlive()); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * await is interruptible + */ public void testAwait_Interrupt() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -511,7 +698,7 @@ public class ReentrantReadWriteLockTest lock.writeLock().lock(); c.await(); lock.writeLock().unlock(); - fail("should throw"); + threadShouldThrow(); } catch(InterruptedException success) { } @@ -526,10 +713,13 @@ public class ReentrantReadWriteLockTest assertFalse(t.isAlive()); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * awaitNanos is interruptible + */ public void testAwaitNanos_Interrupt() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -539,7 +729,7 @@ public class ReentrantReadWriteLockTest lock.writeLock().lock(); c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000); lock.writeLock().unlock(); - fail("should throw"); + threadShouldThrow(); } catch(InterruptedException success) { } @@ -554,10 +744,13 @@ public class ReentrantReadWriteLockTest assertFalse(t.isAlive()); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * awaitUntil is interruptible + */ public void testAwaitUntil_Interrupt() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -568,7 +761,7 @@ public class ReentrantReadWriteLockTest java.util.Date d = new java.util.Date(); c.awaitUntil(new java.util.Date(d.getTime() + 10000)); lock.writeLock().unlock(); - fail("should throw"); + threadShouldThrow(); } catch(InterruptedException success) { } @@ -583,10 +776,13 @@ public class ReentrantReadWriteLockTest assertFalse(t.isAlive()); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * signalAll wakes up all threads + */ public void testSignalAll() { final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); final Condition c = lock.writeLock().newCondition(); @@ -598,7 +794,7 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); } catch(InterruptedException e) { - fail("unexpected exception"); + threadUnexpectedException(); } } }); @@ -611,7 +807,7 @@ public class ReentrantReadWriteLockTest lock.writeLock().unlock(); } catch(InterruptedException e) { - fail("unexpected exception"); + threadUnexpectedException(); } } }); @@ -629,10 +825,13 @@ public class ReentrantReadWriteLockTest assertFalse(t2.isAlive()); } catch (Exception ex) { - fail("unexpected exception"); + unexpectedException(); } } + /** + * A serialized lock deserializes as unlocked + */ public void testSerialization() { ReentrantReadWriteLock l = new ReentrantReadWriteLock(); l.readLock().lock(); @@ -651,9 +850,235 @@ public class ReentrantReadWriteLockTest r.readLock().unlock(); } catch(Exception e){ e.printStackTrace(); - fail("unexpected exception"); + unexpectedException(); + } + } + + /** + * getQueueLength reports number of waiting threads + */ + public void testGetQueueLength() { + final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); + Thread t1 = new Thread(new InterruptedLockRunnable(lock)); + Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); + try { + assertEquals(0, lock.getQueueLength()); + lock.writeLock().lock(); + t1.start(); + Thread.sleep(SHORT_DELAY_MS); + assertEquals(1, lock.getQueueLength()); + t2.start(); + Thread.sleep(SHORT_DELAY_MS); + assertEquals(2, lock.getQueueLength()); + t1.interrupt(); + Thread.sleep(SHORT_DELAY_MS); + assertEquals(1, lock.getQueueLength()); + lock.writeLock().unlock(); + Thread.sleep(SHORT_DELAY_MS); + assertEquals(0, lock.getQueueLength()); + t1.join(); + t2.join(); + } catch(Exception e){ + unexpectedException(); + } + } + + /** + * getQueuedThreads includes waiting threads + */ + public void testGetQueuedThreads() { + final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); + Thread t1 = new Thread(new InterruptedLockRunnable(lock)); + Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); + try { + assertTrue(lock.getQueuedThreads().isEmpty()); + lock.writeLock().lock(); + assertTrue(lock.getQueuedThreads().isEmpty()); + t1.start(); + Thread.sleep(SHORT_DELAY_MS); + assertTrue(lock.getQueuedThreads().contains(t1)); + t2.start(); + Thread.sleep(SHORT_DELAY_MS); + assertTrue(lock.getQueuedThreads().contains(t1)); + assertTrue(lock.getQueuedThreads().contains(t2)); + t1.interrupt(); + Thread.sleep(SHORT_DELAY_MS); + assertFalse(lock.getQueuedThreads().contains(t1)); + assertTrue(lock.getQueuedThreads().contains(t2)); + lock.writeLock().unlock(); + Thread.sleep(SHORT_DELAY_MS); + assertTrue(lock.getQueuedThreads().isEmpty()); + t1.join(); + t2.join(); + } catch(Exception e){ + unexpectedException(); + } + } + + /** + * hasWaiters returns true when a thread is waiting, else false + */ + public void testHasWaiters() { + final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); + final ReentrantReadWriteLock.WriterConditionObject c = (ReentrantReadWriteLock.WriterConditionObject)(lock.writeLock().newCondition()); + Thread t = new Thread(new Runnable() { + public void run() { + try { + lock.writeLock().lock(); + threadAssertFalse(c.hasWaiters()); + threadAssertEquals(0, c.getWaitQueueLength()); + c.await(); + lock.writeLock().unlock(); + } + catch(InterruptedException e) { + threadUnexpectedException(); + } + } + }); + + try { + t.start(); + Thread.sleep(SHORT_DELAY_MS); + lock.writeLock().lock(); + assertTrue(c.hasWaiters()); + assertEquals(1, c.getWaitQueueLength()); + c.signal(); + lock.writeLock().unlock(); + Thread.sleep(SHORT_DELAY_MS); + lock.writeLock().lock(); + assertFalse(c.hasWaiters()); + assertEquals(0, c.getWaitQueueLength()); + lock.writeLock().unlock(); + t.join(SHORT_DELAY_MS); + assertFalse(t.isAlive()); + } + catch (Exception ex) { + unexpectedException(); } } + /** + * getWaitQueueLength returns number of waiting threads + */ + public void testGetWaitQueueLength() { + final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); + final ReentrantReadWriteLock.WriterConditionObject c = (ReentrantReadWriteLock.WriterConditionObject)(lock.writeLock().newCondition()); + Thread t1 = new Thread(new Runnable() { + public void run() { + try { + lock.writeLock().lock(); + threadAssertFalse(c.hasWaiters()); + threadAssertEquals(0, c.getWaitQueueLength()); + c.await(); + lock.writeLock().unlock(); + } + catch(InterruptedException e) { + threadUnexpectedException(); + } + } + }); + + Thread t2 = new Thread(new Runnable() { + public void run() { + try { + lock.writeLock().lock(); + threadAssertTrue(c.hasWaiters()); + threadAssertEquals(1, c.getWaitQueueLength()); + c.await(); + lock.writeLock().unlock(); + } + catch(InterruptedException e) { + threadUnexpectedException(); + } + } + }); + + try { + t1.start(); + Thread.sleep(SHORT_DELAY_MS); + t2.start(); + Thread.sleep(SHORT_DELAY_MS); + lock.writeLock().lock(); + assertTrue(c.hasWaiters()); + assertEquals(2, c.getWaitQueueLength()); + c.signalAll(); + lock.writeLock().unlock(); + Thread.sleep(SHORT_DELAY_MS); + lock.writeLock().lock(); + assertFalse(c.hasWaiters()); + assertEquals(0, c.getWaitQueueLength()); + lock.writeLock().unlock(); + t1.join(SHORT_DELAY_MS); + t2.join(SHORT_DELAY_MS); + assertFalse(t1.isAlive()); + assertFalse(t2.isAlive()); + } + catch (Exception ex) { + unexpectedException(); + } + } + + /** + * getWaitingThreads returns only and all waiting threads + */ + public void testGetWaitingThreads() { + final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(); + final PublicReentrantReadWriteLock.PublicCondition c = (PublicReentrantReadWriteLock.PublicCondition)lock.newCondition(); + Thread t1 = new Thread(new Runnable() { + public void run() { + try { + lock.writeLock().lock(); + threadAssertTrue(c.getWaitingThreads().isEmpty()); + c.await(); + lock.writeLock().unlock(); + } + catch(InterruptedException e) { + threadUnexpectedException(); + } + } + }); + + Thread t2 = new Thread(new Runnable() { + public void run() { + try { + lock.writeLock().lock(); + threadAssertFalse(c.getWaitingThreads().isEmpty()); + c.await(); + lock.writeLock().unlock(); + } + catch(InterruptedException e) { + threadUnexpectedException(); + } + } + }); + + try { + lock.writeLock().lock(); + assertTrue(c.getWaitingThreads().isEmpty()); + lock.writeLock().unlock(); + t1.start(); + Thread.sleep(SHORT_DELAY_MS); + t2.start(); + Thread.sleep(SHORT_DELAY_MS); + lock.writeLock().lock(); + assertTrue(c.hasWaiters()); + assertTrue(c.getWaitingThreads().contains(t1)); + assertTrue(c.getWaitingThreads().contains(t2)); + c.signalAll(); + lock.writeLock().unlock(); + Thread.sleep(SHORT_DELAY_MS); + lock.writeLock().lock(); + assertFalse(c.hasWaiters()); + assertTrue(c.getWaitingThreads().isEmpty()); + lock.writeLock().unlock(); + t1.join(SHORT_DELAY_MS); + t2.join(SHORT_DELAY_MS); + assertFalse(t1.isAlive()); + assertFalse(t2.isAlive()); + } + catch (Exception ex) { + unexpectedException(); + } + } }