test/tck/StampedLockTest.java

/*
 * Written by Doug Lea and Martin Buchholz
 * with assistance from members of JCP JSR-166 Expert Group and
 * released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.StampedLock;
import java.util.concurrent.CountDownLatch;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.*;

public class StampedLockTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(StampedLockTest.class);
    }

    // XXXX Just a skeleton implementation for now.
    public void testTODO() { fail("StampedLockTest needs help"); }

    public void testConstructor() { new StampedLock(); }

//     /**
//      * A runnable calling lockInterruptibly
//      */
//     class InterruptibleLockRunnable extends CheckedRunnable {
//         final ReentrantReadWriteLock lock;
//         InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
//         public void realRun() throws InterruptedException {
//             lock.writeLock().lockInterruptibly();
//         }
//     }

//     /**
//      * A runnable calling lockInterruptibly that expects to be
//      * interrupted
//      */
//     class InterruptedLockRunnable extends CheckedInterruptedRunnable {
//         final ReentrantReadWriteLock lock;
//         InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
//         public void realRun() throws InterruptedException {
//             lock.writeLock().lockInterruptibly();
//         }
//     }

//     /**
//      * Subclass to expose protected methods
//      */
//     static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
//         PublicReentrantReadWriteLock() { super(); }
//         PublicReentrantReadWriteLock(boolean fair) { super(fair); }
//         public Thread getOwner() {
//             return super.getOwner();
//         }
//         public Collection<Thread> getQueuedThreads() {
//             return super.getQueuedThreads();
//         }
//         public Collection<Thread> getWaitingThreads(Condition c) {
//             return super.getWaitingThreads(c);
//         }
//     }

//     /**
//      * Releases write lock, checking that it had a hold count of 1.
//      */
//     void releaseWriteLock(PublicReentrantReadWriteLock lock) {
//         ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
//         assertWriteLockedByMoi(lock);
//         assertEquals(1, lock.getWriteHoldCount());
//         writeLock.unlock();
//         assertNotWriteLocked(lock);
//     }

//     /**
//      * Spin-waits until lock.hasQueuedThread(t) becomes true.
//      */
//     void waitForQueuedThread(PublicReentrantReadWriteLock lock, Thread t) {
//         long startTime = System.nanoTime();
//         while (!lock.hasQueuedThread(t)) {
//             if (millisElapsedSince(startTime) > LONG_DELAY_MS)
//                 throw new AssertionFailedError("timed out");
//             Thread.yield();
//         }
//         assertTrue(t.isAlive());
//         assertTrue(lock.getOwner() != t);
//     }

//     /**
//      * Checks that lock is not write-locked.
//      */
//     void assertNotWriteLocked(PublicReentrantReadWriteLock lock) {
//         assertFalse(lock.isWriteLocked());
//         assertFalse(lock.isWriteLockedByCurrentThread());
//         assertFalse(lock.writeLock().isHeldByCurrentThread());
//         assertEquals(0, lock.getWriteHoldCount());
//         assertEquals(0, lock.writeLock().getHoldCount());
//         assertNull(lock.getOwner());
//     }

//     /**
//      * Checks that lock is write-locked by the given thread.
//      */
//     void assertWriteLockedBy(PublicReentrantReadWriteLock lock, Thread t) {
//         assertTrue(lock.isWriteLocked());
//         assertSame(t, lock.getOwner());
//         assertEquals(t == Thread.currentThread(),
//                      lock.isWriteLockedByCurrentThread());
//         assertEquals(t == Thread.currentThread(),
//                      lock.writeLock().isHeldByCurrentThread());
//         assertEquals(t == Thread.currentThread(),
//                      lock.getWriteHoldCount() > 0);
//         assertEquals(t == Thread.currentThread(),
//                      lock.writeLock().getHoldCount() > 0);
//         assertEquals(0, lock.getReadLockCount());
//     }

//     /**
//      * Checks that lock is write-locked by the current thread.
//      */
//     void assertWriteLockedByMoi(PublicReentrantReadWriteLock lock) {
//         assertWriteLockedBy(lock, Thread.currentThread());
//     }

//     /**
//      * Checks that condition c has no waiters.
//      */
//     void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
//         assertHasWaiters(lock, c, new Thread[] {});
//     }

//     /**
//      * Checks that condition c has exactly the given waiter threads.
//      */
//     void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
//                           Thread... threads) {
//         lock.writeLock().lock();
//         assertEquals(threads.length > 0, lock.hasWaiters(c));
//         assertEquals(threads.length, lock.getWaitQueueLength(c));
//         assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
//         assertEquals(threads.length, lock.getWaitingThreads(c).size());
//         assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
//                      new HashSet<Thread>(Arrays.asList(threads)));
//         lock.writeLock().unlock();
//     }

//     enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil };

//     /**
//      * Awaits condition using the specified AwaitMethod.
//      */
//     void await(Condition c, AwaitMethod awaitMethod)
//             throws InterruptedException {
//         switch (awaitMethod) {
//         case await:
//             c.await();
//             break;
//         case awaitTimed:
//             assertTrue(c.await(2 * LONG_DELAY_MS, MILLISECONDS));
//             break;
//         case awaitNanos:
//             long nanosRemaining = c.awaitNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS));
//             assertTrue(nanosRemaining > 0);
//             break;
//         case awaitUntil:
//             java.util.Date d = new java.util.Date();
//             assertTrue(c.awaitUntil(new java.util.Date(d.getTime() + 2 * LONG_DELAY_MS)));
//             break;
//         }
//     }

//     /**
//      * Constructor sets given fairness, and is in unlocked state
//      */
//     public void testConstructor() {
//         PublicReentrantReadWriteLock lock;

//         lock = new PublicReentrantReadWriteLock();
//         assertFalse(lock.isFair());
//         assertNotWriteLocked(lock);
//         assertEquals(0, lock.getReadLockCount());

//         lock = new PublicReentrantReadWriteLock(true);
//         assertTrue(lock.isFair());
//         assertNotWriteLocked(lock);
//         assertEquals(0, lock.getReadLockCount());

//         lock = new PublicReentrantReadWriteLock(false);
//         assertFalse(lock.isFair());
//         assertNotWriteLocked(lock);
//         assertEquals(0, lock.getReadLockCount());
//     }

//     /**
//      * write-locking and read-locking an unlocked lock succeed
//      */
//     public void testLock()      { testLock(false); }
//     public void testLock_fair() { testLock(true); }
//     public void testLock(boolean fair) {
//         PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         assertNotWriteLocked(lock);
//         lock.writeLock().lock();
//         assertWriteLockedByMoi(lock);
//         lock.writeLock().unlock();
//         assertNotWriteLocked(lock);
//         assertEquals(0, lock.getReadLockCount());
//         lock.readLock().lock();
//         assertNotWriteLocked(lock);
//         assertEquals(1, lock.getReadLockCount());
//         lock.readLock().unlock();
//         assertNotWriteLocked(lock);
//         assertEquals(0, lock.getReadLockCount());
//     }

//     /**
//      * getWriteHoldCount returns number of recursive holds
//      */
//     public void testGetWriteHoldCount()      { testGetWriteHoldCount(false); }
//     public void testGetWriteHoldCount_fair() { testGetWriteHoldCount(true); }
//     public void testGetWriteHoldCount(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         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());
//         }
//     }

//     /**
//      * writelock.getHoldCount returns number of recursive holds
//      */
//     public void testGetHoldCount()      { testGetHoldCount(false); }
//     public void testGetHoldCount_fair() { testGetHoldCount(true); }
//     public void testGetHoldCount(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         for (int i = 1; i <= SIZE; i++) {
//             lock.writeLock().lock();
//             assertEquals(i,lock.writeLock().getHoldCount());
//         }
//         for (int i = SIZE; i > 0; i--) {
//             lock.writeLock().unlock();
//             assertEquals(i-1,lock.writeLock().getHoldCount());
//         }
//     }

//     /**
//      * getReadHoldCount returns number of recursive holds
//      */
//     public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
//     public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
//     public void testGetReadHoldCount(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         for (int i = 1; i <= SIZE; i++) {
//             lock.readLock().lock();
//             assertEquals(i,lock.getReadHoldCount());
//         }
//         for (int i = SIZE; i > 0; i--) {
//             lock.readLock().unlock();
//             assertEquals(i-1,lock.getReadHoldCount());
//         }
//     }

//     /**
//      * write-unlocking an unlocked lock throws IllegalMonitorStateException
//      */
//     public void testWriteUnlock_IMSE()      { testWriteUnlock_IMSE(false); }
//     public void testWriteUnlock_IMSE_fair() { testWriteUnlock_IMSE(true); }
//     public void testWriteUnlock_IMSE(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         try {
//             lock.writeLock().unlock();
//             shouldThrow();
//         } catch (IllegalMonitorStateException success) {}
//     }

//     /**
//      * read-unlocking an unlocked lock throws IllegalMonitorStateException
//      */
//     public void testReadUnlock_IMSE()      { testReadUnlock_IMSE(false); }
//     public void testReadUnlock_IMSE_fair() { testReadUnlock_IMSE(true); }
//     public void testReadUnlock_IMSE(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         try {
//             lock.readLock().unlock();
//             shouldThrow();
//         } catch (IllegalMonitorStateException success) {}
//     }

//     /**
//      * write-lockInterruptibly is interruptible
//      */
//     public void testWriteLockInterruptibly_Interruptible()      { testWriteLockInterruptibly_Interruptible(false); }
//     public void testWriteLockInterruptibly_Interruptible_fair() { testWriteLockInterruptibly_Interruptible(true); }
//     public void testWriteLockInterruptibly_Interruptible(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedInterruptedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lockInterruptibly();
//             }});

//         waitForQueuedThread(lock, t);
//         t.interrupt();
//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * timed write-tryLock is interruptible
//      */
//     public void testWriteTryLock_Interruptible()      { testWriteTryLock_Interruptible(false); }
//     public void testWriteTryLock_Interruptible_fair() { testWriteTryLock_Interruptible(true); }
//     public void testWriteTryLock_Interruptible(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedInterruptedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
//             }});

//         waitForQueuedThread(lock, t);
//         t.interrupt();
//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * read-lockInterruptibly is interruptible
//      */
//     public void testReadLockInterruptibly_Interruptible()      { testReadLockInterruptibly_Interruptible(false); }
//     public void testReadLockInterruptibly_Interruptible_fair() { testReadLockInterruptibly_Interruptible(true); }
//     public void testReadLockInterruptibly_Interruptible(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedInterruptedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.readLock().lockInterruptibly();
//             }});

//         waitForQueuedThread(lock, t);
//         t.interrupt();
//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * timed read-tryLock is interruptible
//      */
//     public void testReadTryLock_Interruptible()      { testReadTryLock_Interruptible(false); }
//     public void testReadTryLock_Interruptible_fair() { testReadTryLock_Interruptible(true); }
//     public void testReadTryLock_Interruptible(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedInterruptedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
//             }});

//         waitForQueuedThread(lock, t);
//         t.interrupt();
//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * write-tryLock on an unlocked lock succeeds
//      */
//     public void testWriteTryLock()      { testWriteTryLock(false); }
//     public void testWriteTryLock_fair() { testWriteTryLock(true); }
//     public void testWriteTryLock(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         assertTrue(lock.writeLock().tryLock());
//         assertWriteLockedByMoi(lock);
//         assertTrue(lock.writeLock().tryLock());
//         assertWriteLockedByMoi(lock);
//         lock.writeLock().unlock();
//         releaseWriteLock(lock);
//     }

//     /**
//      * write-tryLock fails if locked
//      */
//     public void testWriteTryLockWhenLocked()      { testWriteTryLockWhenLocked(false); }
//     public void testWriteTryLockWhenLocked_fair() { testWriteTryLockWhenLocked(true); }
//     public void testWriteTryLockWhenLocked(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertFalse(lock.writeLock().tryLock());
//             }});

//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * read-tryLock fails if locked
//      */
//     public void testReadTryLockWhenLocked()      { testReadTryLockWhenLocked(false); }
//     public void testReadTryLockWhenLocked_fair() { testReadTryLockWhenLocked(true); }
//     public void testReadTryLockWhenLocked(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertFalse(lock.readLock().tryLock());
//             }});

//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * Multiple threads can hold a read lock when not write-locked
//      */
//     public void testMultipleReadLocks()      { testMultipleReadLocks(false); }
//     public void testMultipleReadLocks_fair() { testMultipleReadLocks(true); }
//     public void testMultipleReadLocks(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         lock.readLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 assertTrue(lock.readLock().tryLock());
//                 lock.readLock().unlock();
//                 assertTrue(lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS));
//                 lock.readLock().unlock();
//                 lock.readLock().lock();
//                 lock.readLock().unlock();
//             }});

//         awaitTermination(t);
//         lock.readLock().unlock();
//     }

//     /**
//      * A writelock succeeds only after a reading thread unlocks
//      */
//     public void testWriteAfterReadLock()      { testWriteAfterReadLock(false); }
//     public void testWriteAfterReadLock_fair() { testWriteAfterReadLock(true); }
//     public void testWriteAfterReadLock(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.readLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertEquals(1, lock.getReadLockCount());
//                 lock.writeLock().lock();
//                 assertEquals(0, lock.getReadLockCount());
//                 lock.writeLock().unlock();
//             }});
//         waitForQueuedThread(lock, t);
//         assertNotWriteLocked(lock);
//         assertEquals(1, lock.getReadLockCount());
//         lock.readLock().unlock();
//         assertEquals(0, lock.getReadLockCount());
//         awaitTermination(t);
//         assertNotWriteLocked(lock);
//     }

//     /**
//      * A writelock succeeds only after reading threads unlock
//      */
//     public void testWriteAfterMultipleReadLocks()      { testWriteAfterMultipleReadLocks(false); }
//     public void testWriteAfterMultipleReadLocks_fair() { testWriteAfterMultipleReadLocks(true); }
//     public void testWriteAfterMultipleReadLocks(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.readLock().lock();
//         lock.readLock().lock();
//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.readLock().lock();
//                 assertEquals(3, lock.getReadLockCount());
//                 lock.readLock().unlock();
//             }});
//         awaitTermination(t1);

//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertEquals(2, lock.getReadLockCount());
//                 lock.writeLock().lock();
//                 assertEquals(0, lock.getReadLockCount());
//                 lock.writeLock().unlock();
//             }});
//         waitForQueuedThread(lock, t2);
//         assertNotWriteLocked(lock);
//         assertEquals(2, lock.getReadLockCount());
//         lock.readLock().unlock();
//         lock.readLock().unlock();
//         assertEquals(0, lock.getReadLockCount());
//         awaitTermination(t2);
//         assertNotWriteLocked(lock);
//     }

//     /**
//      * A thread that tries to acquire a fair read lock (non-reentrantly)
//      * will block if there is a waiting writer thread
//      */
//     public void testReaderWriterReaderFairFifo() {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(true);
//         final AtomicBoolean t1GotLock = new AtomicBoolean(false);

//         lock.readLock().lock();
//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertEquals(1, lock.getReadLockCount());
//                 lock.writeLock().lock();
//                 assertEquals(0, lock.getReadLockCount());
//                 t1GotLock.set(true);
//                 lock.writeLock().unlock();
//             }});
//         waitForQueuedThread(lock, t1);

//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertEquals(1, lock.getReadLockCount());
//                 lock.readLock().lock();
//                 assertEquals(1, lock.getReadLockCount());
//                 assertTrue(t1GotLock.get());
//                 lock.readLock().unlock();
//             }});
//         waitForQueuedThread(lock, t2);
//         assertTrue(t1.isAlive());
//         assertNotWriteLocked(lock);
//         assertEquals(1, lock.getReadLockCount());
//         lock.readLock().unlock();
//         awaitTermination(t1);
//         awaitTermination(t2);
//         assertNotWriteLocked(lock);
//     }

//     /**
//      * Readlocks succeed only after a writing thread unlocks
//      */
//     public void testReadAfterWriteLock()      { testReadAfterWriteLock(false); }
//     public void testReadAfterWriteLock_fair() { testReadAfterWriteLock(true); }
//     public void testReadAfterWriteLock(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.readLock().lock();
//                 lock.readLock().unlock();
//             }});
//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.readLock().lock();
//                 lock.readLock().unlock();
//             }});

//         waitForQueuedThread(lock, t1);
//         waitForQueuedThread(lock, t2);
//         releaseWriteLock(lock);
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * Read trylock succeeds if write locked by current thread
//      */
//     public void testReadHoldingWriteLock()      { testReadHoldingWriteLock(false); }
//     public void testReadHoldingWriteLock_fair() { testReadHoldingWriteLock(true); }
//     public void testReadHoldingWriteLock(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         assertTrue(lock.readLock().tryLock());
//         lock.readLock().unlock();
//         lock.writeLock().unlock();
//     }

//     /**
//      * Read trylock succeeds (barging) even in the presence of waiting
//      * readers and/or writers
//      */
//     public void testReadTryLockBarging()      { testReadTryLockBarging(false); }
//     public void testReadTryLockBarging_fair() { testReadTryLockBarging(true); }
//     public void testReadTryLockBarging(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.readLock().lock();

//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.writeLock().lock();
//                 lock.writeLock().unlock();
//             }});

//         waitForQueuedThread(lock, t1);

//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.readLock().lock();
//                 lock.readLock().unlock();
//             }});

//         if (fair)
//             waitForQueuedThread(lock, t2);

//         Thread t3 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.readLock().tryLock();
//                 lock.readLock().unlock();
//             }});

//         assertTrue(lock.getReadLockCount() > 0);
//         awaitTermination(t3);
//         assertTrue(t1.isAlive());
//         if (fair) assertTrue(t2.isAlive());
//         lock.readLock().unlock();
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * Read lock succeeds if write locked by current thread even if
//      * other threads are waiting for readlock
//      */
//     public void testReadHoldingWriteLock2()      { testReadHoldingWriteLock2(false); }
//     public void testReadHoldingWriteLock2_fair() { testReadHoldingWriteLock2(true); }
//     public void testReadHoldingWriteLock2(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         lock.readLock().lock();
//         lock.readLock().unlock();

//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.readLock().lock();
//                 lock.readLock().unlock();
//             }});
//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.readLock().lock();
//                 lock.readLock().unlock();
//             }});

//         waitForQueuedThread(lock, t1);
//         waitForQueuedThread(lock, t2);
//         assertWriteLockedByMoi(lock);
//         lock.readLock().lock();
//         lock.readLock().unlock();
//         releaseWriteLock(lock);
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * Read lock succeeds if write locked by current thread even if
//      * other threads are waiting for writelock
//      */
//     public void testReadHoldingWriteLock3()      { testReadHoldingWriteLock3(false); }
//     public void testReadHoldingWriteLock3_fair() { testReadHoldingWriteLock3(true); }
//     public void testReadHoldingWriteLock3(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         lock.readLock().lock();
//         lock.readLock().unlock();

//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.writeLock().lock();
//                 lock.writeLock().unlock();
//             }});
//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.writeLock().lock();
//                 lock.writeLock().unlock();
//             }});

//         waitForQueuedThread(lock, t1);
//         waitForQueuedThread(lock, t2);
//         assertWriteLockedByMoi(lock);
//         lock.readLock().lock();
//         lock.readLock().unlock();
//         assertWriteLockedByMoi(lock);
//         lock.writeLock().unlock();
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * Write lock succeeds if write locked by current thread even if
//      * other threads are waiting for writelock
//      */
//     public void testWriteHoldingWriteLock4()      { testWriteHoldingWriteLock4(false); }
//     public void testWriteHoldingWriteLock4_fair() { testWriteHoldingWriteLock4(true); }
//     public void testWriteHoldingWriteLock4(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         lock.writeLock().lock();
//         lock.writeLock().unlock();

//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.writeLock().lock();
//                 lock.writeLock().unlock();
//             }});
//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 lock.writeLock().lock();
//                 lock.writeLock().unlock();
//             }});

//         waitForQueuedThread(lock, t1);
//         waitForQueuedThread(lock, t2);
//         assertWriteLockedByMoi(lock);
//         assertEquals(1, lock.getWriteHoldCount());
//         lock.writeLock().lock();
//         assertWriteLockedByMoi(lock);
//         assertEquals(2, lock.getWriteHoldCount());
//         lock.writeLock().unlock();
//         assertWriteLockedByMoi(lock);
//         assertEquals(1, lock.getWriteHoldCount());
//         lock.writeLock().unlock();
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * Read tryLock succeeds if readlocked but not writelocked
//      */
//     public void testTryLockWhenReadLocked()      { testTryLockWhenReadLocked(false); }
//     public void testTryLockWhenReadLocked_fair() { testTryLockWhenReadLocked(true); }
//     public void testTryLockWhenReadLocked(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         lock.readLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertTrue(lock.readLock().tryLock());
//                 lock.readLock().unlock();
//             }});

//         awaitTermination(t);
//         lock.readLock().unlock();
//     }

//     /**
//      * write tryLock fails when readlocked
//      */
//     public void testWriteTryLockWhenReadLocked()      { testWriteTryLockWhenReadLocked(false); }
//     public void testWriteTryLockWhenReadLocked_fair() { testWriteTryLockWhenReadLocked(true); }
//     public void testWriteTryLockWhenReadLocked(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         lock.readLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 assertFalse(lock.writeLock().tryLock());
//             }});

//         awaitTermination(t);
//         lock.readLock().unlock();
//     }

//     /**
//      * write timed tryLock times out if locked
//      */
//     public void testWriteTryLock_Timeout()      { testWriteTryLock_Timeout(false); }
//     public void testWriteTryLock_Timeout_fair() { testWriteTryLock_Timeout(true); }
//     public void testWriteTryLock_Timeout(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 long startTime = System.nanoTime();
//                 long timeoutMillis = 10;
//                 assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
//                 assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
//             }});

//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * read timed tryLock times out if write-locked
//      */
//     public void testReadTryLock_Timeout()      { testReadTryLock_Timeout(false); }
//     public void testReadTryLock_Timeout_fair() { testReadTryLock_Timeout(true); }
//     public void testReadTryLock_Timeout(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 long startTime = System.nanoTime();
//                 long timeoutMillis = 10;
//                 assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
//                 assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
//             }});

//         awaitTermination(t);
//         assertTrue(lock.writeLock().isHeldByCurrentThread());
//         lock.writeLock().unlock();
//     }

//     /**
//      * write lockInterruptibly succeeds if unlocked, else is interruptible
//      */
//     public void testWriteLockInterruptibly()      { testWriteLockInterruptibly(false); }
//     public void testWriteLockInterruptibly_fair() { testWriteLockInterruptibly(true); }
//     public void testWriteLockInterruptibly(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         try {
//             lock.writeLock().lockInterruptibly();
//         } catch (InterruptedException ie) {
//             threadUnexpectedException(ie);
//         }
//         Thread t = newStartedThread(new CheckedInterruptedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lockInterruptibly();
//             }});

//         waitForQueuedThread(lock, t);
//         t.interrupt();
//         assertTrue(lock.writeLock().isHeldByCurrentThread());
//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * read lockInterruptibly succeeds if lock free else is interruptible
//      */
//     public void testReadLockInterruptibly()      { testReadLockInterruptibly(false); }
//     public void testReadLockInterruptibly_fair() { testReadLockInterruptibly(true); }
//     public void testReadLockInterruptibly(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         try {
//             lock.readLock().lockInterruptibly();
//             lock.readLock().unlock();
//             lock.writeLock().lockInterruptibly();
//         } catch (InterruptedException ie) {
//             threadUnexpectedException(ie);
//         }
//         Thread t = newStartedThread(new CheckedInterruptedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.readLock().lockInterruptibly();
//             }});

//         waitForQueuedThread(lock, t);
//         t.interrupt();
//         awaitTermination(t);
//         releaseWriteLock(lock);
//     }

//     /**
//      * Calling await without holding lock throws IllegalMonitorStateException
//      */
//     public void testAwait_IMSE()      { testAwait_IMSE(false); }
//     public void testAwait_IMSE_fair() { testAwait_IMSE(true); }
//     public void testAwait_IMSE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         for (AwaitMethod awaitMethod : AwaitMethod.values()) {
//             long startTime = System.nanoTime();
//             try {
//                 await(c, awaitMethod);
//                 shouldThrow();
//             } catch (IllegalMonitorStateException success) {
//             } catch (InterruptedException e) { threadUnexpectedException(e); }
//             assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
//         }
//     }

//     /**
//      * Calling signal without holding lock throws IllegalMonitorStateException
//      */
//     public void testSignal_IMSE()      { testSignal_IMSE(false); }
//     public void testSignal_IMSE_fair() { testSignal_IMSE(true); }
//     public void testSignal_IMSE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         try {
//             c.signal();
//             shouldThrow();
//         } catch (IllegalMonitorStateException success) {}
//     }

//     /**
//      * Calling signalAll without holding lock throws IllegalMonitorStateException
//      */
//     public void testSignalAll_IMSE()      { testSignalAll_IMSE(false); }
//     public void testSignalAll_IMSE_fair() { testSignalAll_IMSE(true); }
//     public void testSignalAll_IMSE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         try {
//             c.signalAll();
//             shouldThrow();
//         } catch (IllegalMonitorStateException success) {}
//     }

//     /**
//      * awaitNanos without a signal times out
//      */
//     public void testAwaitNanos_Timeout()      { testAwaitNanos_Timeout(false); }
//     public void testAwaitNanos_Timeout_fair() { testAwaitNanos_Timeout(true); }
//     public void testAwaitNanos_Timeout(boolean fair) {
//         try {
//             final ReentrantReadWriteLock lock =
//                 new ReentrantReadWriteLock(fair);
//             final Condition c = lock.writeLock().newCondition();
//             lock.writeLock().lock();
//             long startTime = System.nanoTime();
//             long timeoutMillis = 10;
//             long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
//             long nanosRemaining = c.awaitNanos(timeoutNanos);
//             assertTrue(nanosRemaining <= 0);
//             assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
//             lock.writeLock().unlock();
//         } catch (InterruptedException e) {
//             threadUnexpectedException(e);
//         }
//     }

//     /**
//      * timed await without a signal times out
//      */
//     public void testAwait_Timeout()      { testAwait_Timeout(false); }
//     public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
//     public void testAwait_Timeout(boolean fair) {
//         try {
//             final ReentrantReadWriteLock lock =
//                 new ReentrantReadWriteLock(fair);
//             final Condition c = lock.writeLock().newCondition();
//             lock.writeLock().lock();
//             long startTime = System.nanoTime();
//             long timeoutMillis = 10;
//             assertFalse(c.await(timeoutMillis, MILLISECONDS));
//             assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
//             lock.writeLock().unlock();
//         } catch (InterruptedException e) {
//             threadUnexpectedException(e);
//         }
//     }

//     /**
//      * awaitUntil without a signal times out
//      */
//     public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
//     public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
//     public void testAwaitUntil_Timeout(boolean fair) {
//         try {
//             final ReentrantReadWriteLock lock =
//                 new ReentrantReadWriteLock(fair);
//             final Condition c = lock.writeLock().newCondition();
//             lock.writeLock().lock();
//             long startTime = System.nanoTime();
//             long timeoutMillis = 10;
//             java.util.Date d = new java.util.Date();
//             assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + timeoutMillis)));
//             assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
//             lock.writeLock().unlock();
//         } catch (InterruptedException e) {
//             threadUnexpectedException(e);
//         }
//     }

//     /**
//      * await returns when signalled
//      */
//     public void testAwait()      { testAwait(false); }
//     public void testAwait_fair() { testAwait(true); }
//     public void testAwait(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked = new CountDownLatch(1);
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 locked.countDown();
//                 c.await();
//                 lock.writeLock().unlock();
//             }});

//         await(locked);
//         lock.writeLock().lock();
//         assertHasWaiters(lock, c, t);
//         c.signal();
//         assertHasNoWaiters(lock, c);
//         assertTrue(t.isAlive());
//         lock.writeLock().unlock();
//         awaitTermination(t);
//     }

//     /**
//      * awaitUninterruptibly is uninterruptible
//      */
//     public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
//     public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
//     public void testAwaitUninterruptibly(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch pleaseInterrupt = new CountDownLatch(2);

//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 // Interrupt before awaitUninterruptibly
//                 lock.writeLock().lock();
//                 pleaseInterrupt.countDown();
//                 Thread.currentThread().interrupt();
//                 c.awaitUninterruptibly();
//                 assertTrue(Thread.interrupted());
//                 lock.writeLock().unlock();
//             }});

//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() {
//                 // Interrupt during awaitUninterruptibly
//                 lock.writeLock().lock();
//                 pleaseInterrupt.countDown();
//                 c.awaitUninterruptibly();
//                 assertTrue(Thread.interrupted());
//                 lock.writeLock().unlock();
//             }});

//         await(pleaseInterrupt);
//         lock.writeLock().lock();
//         lock.writeLock().unlock();
//         t2.interrupt();

//         assertThreadStaysAlive(t1);
//         assertTrue(t2.isAlive());

//         lock.writeLock().lock();
//         c.signalAll();
//         lock.writeLock().unlock();

//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * await/awaitNanos/awaitUntil is interruptible
//      */
//     public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
//     public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
//     public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
//     public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
//     public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
//     public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
//     public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
//     public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
//     public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked = new CountDownLatch(1);
//         Thread t = newStartedThread(new CheckedInterruptedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 assertWriteLockedByMoi(lock);
//                 assertHasNoWaiters(lock, c);
//                 locked.countDown();
//                 try {
//                     await(c, awaitMethod);
//                 } finally {
//                     assertWriteLockedByMoi(lock);
//                     assertHasNoWaiters(lock, c);
//                     lock.writeLock().unlock();
//                     assertFalse(Thread.interrupted());
//                 }
//             }});

//         await(locked);
//         assertHasWaiters(lock, c, t);
//         t.interrupt();
//         awaitTermination(t);
//         assertNotWriteLocked(lock);
//     }

//     /**
//      * signalAll wakes up all threads
//      */
//     public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
//     public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
//     public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
//     public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
//     public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
//     public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
//     public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
//     public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
//     public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked = new CountDownLatch(2);
//         final Lock writeLock = lock.writeLock();
//         class Awaiter extends CheckedRunnable {
//             public void realRun() throws InterruptedException {
//                 writeLock.lock();
//                 locked.countDown();
//                 await(c, awaitMethod);
//                 writeLock.unlock();
//             }
//         }

//         Thread t1 = newStartedThread(new Awaiter());
//         Thread t2 = newStartedThread(new Awaiter());

//         await(locked);
//         writeLock.lock();
//         assertHasWaiters(lock, c, t1, t2);
//         c.signalAll();
//         assertHasNoWaiters(lock, c);
//         writeLock.unlock();
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * signal wakes up waiting threads in FIFO order
//      */
//     public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
//     public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
//     public void testSignalWakesFifo(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked1 = new CountDownLatch(1);
//         final CountDownLatch locked2 = new CountDownLatch(1);
//         final Lock writeLock = lock.writeLock();
//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 writeLock.lock();
//                 locked1.countDown();
//                 c.await();
//                 writeLock.unlock();
//             }});

//         await(locked1);

//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 writeLock.lock();
//                 locked2.countDown();
//                 c.await();
//                 writeLock.unlock();
//             }});

//         await(locked2);

//         writeLock.lock();
//         assertHasWaiters(lock, c, t1, t2);
//         assertFalse(lock.hasQueuedThreads());
//         c.signal();
//         assertHasWaiters(lock, c, t2);
//         assertTrue(lock.hasQueuedThread(t1));
//         assertFalse(lock.hasQueuedThread(t2));
//         c.signal();
//         assertHasNoWaiters(lock, c);
//         assertTrue(lock.hasQueuedThread(t1));
//         assertTrue(lock.hasQueuedThread(t2));
//         writeLock.unlock();
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * await after multiple reentrant locking preserves lock count
//      */
//     public void testAwaitLockCount()      { testAwaitLockCount(false); }
//     public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
//     public void testAwaitLockCount(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked = new CountDownLatch(2);
//         Thread t1 = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 assertWriteLockedByMoi(lock);
//                 assertEquals(1, lock.writeLock().getHoldCount());
//                 locked.countDown();
//                 c.await();
//                 assertWriteLockedByMoi(lock);
//                 assertEquals(1, lock.writeLock().getHoldCount());
//                 lock.writeLock().unlock();
//             }});

//         Thread t2 = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 lock.writeLock().lock();
//                 assertWriteLockedByMoi(lock);
//                 assertEquals(2, lock.writeLock().getHoldCount());
//                 locked.countDown();
//                 c.await();
//                 assertWriteLockedByMoi(lock);
//                 assertEquals(2, lock.writeLock().getHoldCount());
//                 lock.writeLock().unlock();
//                 lock.writeLock().unlock();
//             }});

//         await(locked);
//         lock.writeLock().lock();
//         assertHasWaiters(lock, c, t1, t2);
//         c.signalAll();
//         assertHasNoWaiters(lock, c);
//         lock.writeLock().unlock();
//         awaitTermination(t1);
//         awaitTermination(t2);
//     }

//     /**
//      * A serialized lock deserializes as unlocked
//      */
//     public void testSerialization()      { testSerialization(false); }
//     public void testSerialization_fair() { testSerialization(true); }
//     public void testSerialization(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         lock.writeLock().lock();
//         lock.readLock().lock();

//         ReentrantReadWriteLock clone = serialClone(lock);
//         assertEquals(lock.isFair(), clone.isFair());
//         assertTrue(lock.isWriteLocked());
//         assertFalse(clone.isWriteLocked());
//         assertEquals(1, lock.getReadLockCount());
//         assertEquals(0, clone.getReadLockCount());
//         clone.writeLock().lock();
//         clone.readLock().lock();
//         assertTrue(clone.isWriteLocked());
//         assertEquals(1, clone.getReadLockCount());
//         clone.readLock().unlock();
//         clone.writeLock().unlock();
//         assertFalse(clone.isWriteLocked());
//         assertEquals(1, lock.getReadLockCount());
//         assertEquals(0, clone.getReadLockCount());
//     }

//     /**
//      * hasQueuedThreads reports whether there are waiting threads
//      */
//     public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
//     public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
//     public void testHasQueuedThreads(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         Thread t1 = new Thread(new InterruptedLockRunnable(lock));
//         Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
//         assertFalse(lock.hasQueuedThreads());
//         lock.writeLock().lock();
//         assertFalse(lock.hasQueuedThreads());
//         t1.start();
//         waitForQueuedThread(lock, t1);
//         assertTrue(lock.hasQueuedThreads());
//         t2.start();
//         waitForQueuedThread(lock, t2);
//         assertTrue(lock.hasQueuedThreads());
//         t1.interrupt();
//         awaitTermination(t1);
//         assertTrue(lock.hasQueuedThreads());
//         lock.writeLock().unlock();
//         awaitTermination(t2);
//         assertFalse(lock.hasQueuedThreads());
//     }

//     /**
//      * hasQueuedThread(null) throws NPE
//      */
//     public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
//     public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
//     public void testHasQueuedThreadNPE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         try {
//             lock.hasQueuedThread(null);
//             shouldThrow();
//         } catch (NullPointerException success) {}
//     }

//     /**
//      * hasQueuedThread reports whether a thread is queued
//      */
//     public void testHasQueuedThread()      { testHasQueuedThread(false); }
//     public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
//     public void testHasQueuedThread(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         Thread t1 = new Thread(new InterruptedLockRunnable(lock));
//         Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
//         assertFalse(lock.hasQueuedThread(t1));
//         assertFalse(lock.hasQueuedThread(t2));
//         lock.writeLock().lock();
//         t1.start();
//         waitForQueuedThread(lock, t1);
//         assertTrue(lock.hasQueuedThread(t1));
//         assertFalse(lock.hasQueuedThread(t2));
//         t2.start();
//         waitForQueuedThread(lock, t2);
//         assertTrue(lock.hasQueuedThread(t1));
//         assertTrue(lock.hasQueuedThread(t2));
//         t1.interrupt();
//         awaitTermination(t1);
//         assertFalse(lock.hasQueuedThread(t1));
//         assertTrue(lock.hasQueuedThread(t2));
//         lock.writeLock().unlock();
//         awaitTermination(t2);
//         assertFalse(lock.hasQueuedThread(t1));
//         assertFalse(lock.hasQueuedThread(t2));
//     }

//     /**
//      * getQueueLength reports number of waiting threads
//      */
//     public void testGetQueueLength()      { testGetQueueLength(false); }
//     public void testGetQueueLength_fair() { testGetQueueLength(true); }
//     public void testGetQueueLength(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         Thread t1 = new Thread(new InterruptedLockRunnable(lock));
//         Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
//         assertEquals(0, lock.getQueueLength());
//         lock.writeLock().lock();
//         t1.start();
//         waitForQueuedThread(lock, t1);
//         assertEquals(1, lock.getQueueLength());
//         t2.start();
//         waitForQueuedThread(lock, t2);
//         assertEquals(2, lock.getQueueLength());
//         t1.interrupt();
//         awaitTermination(t1);
//         assertEquals(1, lock.getQueueLength());
//         lock.writeLock().unlock();
//         awaitTermination(t2);
//         assertEquals(0, lock.getQueueLength());
//     }

//     /**
//      * getQueuedThreads includes waiting threads
//      */
//     public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
//     public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
//     public void testGetQueuedThreads(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         Thread t1 = new Thread(new InterruptedLockRunnable(lock));
//         Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
//         assertTrue(lock.getQueuedThreads().isEmpty());
//         lock.writeLock().lock();
//         assertTrue(lock.getQueuedThreads().isEmpty());
//         t1.start();
//         waitForQueuedThread(lock, t1);
//         assertEquals(1, lock.getQueuedThreads().size());
//         assertTrue(lock.getQueuedThreads().contains(t1));
//         t2.start();
//         waitForQueuedThread(lock, t2);
//         assertEquals(2, lock.getQueuedThreads().size());
//         assertTrue(lock.getQueuedThreads().contains(t1));
//         assertTrue(lock.getQueuedThreads().contains(t2));
//         t1.interrupt();
//         awaitTermination(t1);
//         assertFalse(lock.getQueuedThreads().contains(t1));
//         assertTrue(lock.getQueuedThreads().contains(t2));
//         assertEquals(1, lock.getQueuedThreads().size());
//         lock.writeLock().unlock();
//         awaitTermination(t2);
//         assertTrue(lock.getQueuedThreads().isEmpty());
//     }

//     /**
//      * hasWaiters throws NPE if null
//      */
//     public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
//     public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
//     public void testHasWaitersNPE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         try {
//             lock.hasWaiters(null);
//             shouldThrow();
//         } catch (NullPointerException success) {}
//     }

//     /**
//      * getWaitQueueLength throws NPE if null
//      */
//     public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
//     public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
//     public void testGetWaitQueueLengthNPE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         try {
//             lock.getWaitQueueLength(null);
//             shouldThrow();
//         } catch (NullPointerException success) {}
//     }

//     /**
//      * getWaitingThreads throws NPE if null
//      */
//     public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
//     public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
//     public void testGetWaitingThreadsNPE(boolean fair) {
//         final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
//         try {
//             lock.getWaitingThreads(null);
//             shouldThrow();
//         } catch (NullPointerException success) {}
//     }

//     /**
//      * hasWaiters throws IllegalArgumentException if not owned
//      */
//     public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
//     public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
//     public void testHasWaitersIAE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
//         try {
//             lock2.hasWaiters(c);
//             shouldThrow();
//         } catch (IllegalArgumentException success) {}
//     }

//     /**
//      * hasWaiters throws IllegalMonitorStateException if not locked
//      */
//     public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
//     public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
//     public void testHasWaitersIMSE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         try {
//             lock.hasWaiters(c);
//             shouldThrow();
//         } catch (IllegalMonitorStateException success) {}
//     }

//     /**
//      * getWaitQueueLength throws IllegalArgumentException if not owned
//      */
//     public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
//     public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
//     public void testGetWaitQueueLengthIAE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
//         try {
//             lock2.getWaitQueueLength(c);
//             shouldThrow();
//         } catch (IllegalArgumentException success) {}
//     }

//     /**
//      * getWaitQueueLength throws IllegalMonitorStateException if not locked
//      */
//     public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
//     public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
//     public void testGetWaitQueueLengthIMSE(boolean fair) {
//         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         try {
//             lock.getWaitQueueLength(c);
//             shouldThrow();
//         } catch (IllegalMonitorStateException success) {}
//     }

//     /**
//      * getWaitingThreads throws IllegalArgumentException if not owned
//      */
//     public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
//     public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
//     public void testGetWaitingThreadsIAE(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final PublicReentrantReadWriteLock lock2 =
//             new PublicReentrantReadWriteLock(fair);
//         try {
//             lock2.getWaitingThreads(c);
//             shouldThrow();
//         } catch (IllegalArgumentException success) {}
//     }

//     /**
//      * getWaitingThreads throws IllegalMonitorStateException if not locked
//      */
//     public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
//     public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
//     public void testGetWaitingThreadsIMSE(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         try {
//             lock.getWaitingThreads(c);
//             shouldThrow();
//         } catch (IllegalMonitorStateException success) {}
//     }

//     /**
//      * hasWaiters returns true when a thread is waiting, else false
//      */
//     public void testHasWaiters()      { testHasWaiters(false); }
//     public void testHasWaiters_fair() { testHasWaiters(true); }
//     public void testHasWaiters(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked = new CountDownLatch(1);
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 assertHasNoWaiters(lock, c);
//                 assertFalse(lock.hasWaiters(c));
//                 locked.countDown();
//                 c.await();
//                 assertHasNoWaiters(lock, c);
//                 assertFalse(lock.hasWaiters(c));
//                 lock.writeLock().unlock();
//             }});

//         await(locked);
//         lock.writeLock().lock();
//         assertHasWaiters(lock, c, t);
//         assertTrue(lock.hasWaiters(c));
//         c.signal();
//         assertHasNoWaiters(lock, c);
//         assertFalse(lock.hasWaiters(c));
//         lock.writeLock().unlock();
//         awaitTermination(t);
//         assertHasNoWaiters(lock, c);
//     }

//     /**
//      * getWaitQueueLength returns number of waiting threads
//      */
//     public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
//     public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
//     public void testGetWaitQueueLength(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked = new CountDownLatch(1);
//         Thread t = newStartedThread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 assertEquals(0, lock.getWaitQueueLength(c));
//                 locked.countDown();
//                 c.await();
//                 lock.writeLock().unlock();
//             }});

//         await(locked);
//         lock.writeLock().lock();
//         assertHasWaiters(lock, c, t);
//         assertEquals(1, lock.getWaitQueueLength(c));
//         c.signal();
//         assertHasNoWaiters(lock, c);
//         assertEquals(0, lock.getWaitQueueLength(c));
//         lock.writeLock().unlock();
//         awaitTermination(t);
//     }

//     /**
//      * getWaitingThreads returns only and all waiting threads
//      */
//     public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
//     public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
//     public void testGetWaitingThreads(boolean fair) {
//         final PublicReentrantReadWriteLock lock =
//             new PublicReentrantReadWriteLock(fair);
//         final Condition c = lock.writeLock().newCondition();
//         final CountDownLatch locked1 = new CountDownLatch(1);
//         final CountDownLatch locked2 = new CountDownLatch(1);
//         Thread t1 = new Thread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 assertTrue(lock.getWaitingThreads(c).isEmpty());
//                 locked1.countDown();
//                 c.await();
//                 lock.writeLock().unlock();
//             }});

//         Thread t2 = new Thread(new CheckedRunnable() {
//             public void realRun() throws InterruptedException {
//                 lock.writeLock().lock();
//                 assertFalse(lock.getWaitingThreads(c).isEmpty());
//                 locked2.countDown();
//                 c.await();
//                 lock.writeLock().unlock();
//             }});

//         lock.writeLock().lock();
//         assertTrue(lock.getWaitingThreads(c).isEmpty());
//         lock.writeLock().unlock();

//         t1.start();
//         await(locked1);
//         t2.start();
//         await(locked2);

//         lock.writeLock().lock();
//         assertTrue(lock.hasWaiters(c));
//         assertTrue(lock.getWaitingThreads(c).contains(t1));
//         assertTrue(lock.getWaitingThreads(c).contains(t2));
//         assertEquals(2, lock.getWaitingThreads(c).size());
//         c.signalAll();
//         assertHasNoWaiters(lock, c);
//         lock.writeLock().unlock();

//         awaitTermination(t1);
//         awaitTermination(t2);

//         assertHasNoWaiters(lock, c);
//     }

//     /**
//      * toString indicates current lock state
//      */
//     public void testToString()      { testToString(false); }
//     public void testToString_fair() { testToString(true); }
//     public void testToString(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         assertTrue(lock.toString().contains("Write locks = 0"));
//         assertTrue(lock.toString().contains("Read locks = 0"));
//         lock.writeLock().lock();
//         assertTrue(lock.toString().contains("Write locks = 1"));
//         assertTrue(lock.toString().contains("Read locks = 0"));
//         lock.writeLock().unlock();
//         lock.readLock().lock();
//         lock.readLock().lock();
//         assertTrue(lock.toString().contains("Write locks = 0"));
//         assertTrue(lock.toString().contains("Read locks = 2"));
//     }

//     /**
//      * readLock.toString indicates current lock state
//      */
//     public void testReadLockToString()      { testReadLockToString(false); }
//     public void testReadLockToString_fair() { testReadLockToString(true); }
//     public void testReadLockToString(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         assertTrue(lock.readLock().toString().contains("Read locks = 0"));
//         lock.readLock().lock();
//         lock.readLock().lock();
//         assertTrue(lock.readLock().toString().contains("Read locks = 2"));
//     }

//     /**
//      * writeLock.toString indicates current lock state
//      */
//     public void testWriteLockToString()      { testWriteLockToString(false); }
//     public void testWriteLockToString_fair() { testWriteLockToString(true); }
//     public void testWriteLockToString(boolean fair) {
//         ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
//         assertTrue(lock.writeLock().toString().contains("Unlocked"));
//         lock.writeLock().lock();
//         assertTrue(lock.writeLock().toString().contains("Locked"));
//         lock.writeLock().unlock();
//         assertTrue(lock.writeLock().toString().contains("Unlocked"));
//     }

}
Revision:	1.2
Committed:	Fri Feb 1 21:44:41 2013 UTC (11 years, 3 months ago) by jsr166
Branch:	MAIN
Changes since 1.1:	+5 -2 lines
Log Message:	StampedLockTest, meet StampedLock!