| /* |
| * Written by Doug Lea 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. |
| */ |
| |
| package jsr166; |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.CyclicBarrier; |
| import java.util.concurrent.locks.Condition; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import junit.framework.AssertionFailedError; |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class ReentrantLockTest extends JSR166TestCase { |
| // android-note: Removed because the CTS runner does a bad job of |
| // retrying tests that have suite() declarations. |
| // |
| // public static void main(String[] args) { |
| // main(suite(), args); |
| // } |
| // public static Test suite() { |
| // return new TestSuite(ReentrantLockTest.class); |
| // } |
| |
| /** |
| * A checked runnable calling lockInterruptibly |
| */ |
| class InterruptibleLockRunnable extends CheckedRunnable { |
| final ReentrantLock lock; |
| InterruptibleLockRunnable(ReentrantLock lock) { this.lock = lock; } |
| public void realRun() throws InterruptedException { |
| lock.lockInterruptibly(); |
| } |
| } |
| |
| /** |
| * A checked runnable calling lockInterruptibly that expects to be |
| * interrupted |
| */ |
| class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
| final ReentrantLock lock; |
| InterruptedLockRunnable(ReentrantLock lock) { this.lock = lock; } |
| public void realRun() throws InterruptedException { |
| lock.lockInterruptibly(); |
| } |
| } |
| |
| /** |
| * Subclass to expose protected methods |
| */ |
| static class PublicReentrantLock extends ReentrantLock { |
| PublicReentrantLock() { super(); } |
| PublicReentrantLock(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 releaseLock(PublicReentrantLock lock) { |
| assertLockedByMoi(lock); |
| lock.unlock(); |
| assertFalse(lock.isHeldByCurrentThread()); |
| assertNotLocked(lock); |
| } |
| |
| /** |
| * Spin-waits until lock.hasQueuedThread(t) becomes true. |
| */ |
| void waitForQueuedThread(PublicReentrantLock 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()); |
| assertNotSame(t, lock.getOwner()); |
| } |
| |
| /** |
| * Checks that lock is not locked. |
| */ |
| void assertNotLocked(PublicReentrantLock lock) { |
| assertFalse(lock.isLocked()); |
| assertFalse(lock.isHeldByCurrentThread()); |
| assertNull(lock.getOwner()); |
| assertEquals(0, lock.getHoldCount()); |
| } |
| |
| /** |
| * Checks that lock is locked by the given thread. |
| */ |
| void assertLockedBy(PublicReentrantLock lock, Thread t) { |
| assertTrue(lock.isLocked()); |
| assertSame(t, lock.getOwner()); |
| assertEquals(t == Thread.currentThread(), |
| lock.isHeldByCurrentThread()); |
| assertEquals(t == Thread.currentThread(), |
| lock.getHoldCount() > 0); |
| } |
| |
| /** |
| * Checks that lock is locked by the current thread. |
| */ |
| void assertLockedByMoi(PublicReentrantLock lock) { |
| assertLockedBy(lock, Thread.currentThread()); |
| } |
| |
| /** |
| * Checks that condition c has no waiters. |
| */ |
| void assertHasNoWaiters(PublicReentrantLock lock, Condition c) { |
| assertHasWaiters(lock, c, new Thread[] {}); |
| } |
| |
| /** |
| * Checks that condition c has exactly the given waiter threads. |
| */ |
| void assertHasWaiters(PublicReentrantLock lock, Condition c, |
| Thread... threads) { |
| lock.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.unlock(); |
| } |
| |
| enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil } |
| |
| /** |
| * Awaits condition "indefinitely" using the specified AwaitMethod. |
| */ |
| void await(Condition c, AwaitMethod awaitMethod) |
| throws InterruptedException { |
| long timeoutMillis = 2 * LONG_DELAY_MS; |
| switch (awaitMethod) { |
| case await: |
| c.await(); |
| break; |
| case awaitTimed: |
| assertTrue(c.await(timeoutMillis, MILLISECONDS)); |
| break; |
| case awaitNanos: |
| long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis); |
| long nanosRemaining = c.awaitNanos(timeoutNanos); |
| assertTrue(nanosRemaining > timeoutNanos / 2); |
| assertTrue(nanosRemaining <= timeoutNanos); |
| break; |
| case awaitUntil: |
| assertTrue(c.awaitUntil(delayedDate(timeoutMillis))); |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| } |
| |
| /** |
| * Constructor sets given fairness, and is in unlocked state |
| */ |
| public void testConstructor() { |
| PublicReentrantLock lock; |
| |
| lock = new PublicReentrantLock(); |
| assertFalse(lock.isFair()); |
| assertNotLocked(lock); |
| |
| lock = new PublicReentrantLock(true); |
| assertTrue(lock.isFair()); |
| assertNotLocked(lock); |
| |
| lock = new PublicReentrantLock(false); |
| assertFalse(lock.isFair()); |
| assertNotLocked(lock); |
| } |
| |
| /** |
| * locking an unlocked lock succeeds |
| */ |
| public void testLock() { testLock(false); } |
| public void testLock_fair() { testLock(true); } |
| public void testLock(boolean fair) { |
| PublicReentrantLock lock = new PublicReentrantLock(fair); |
| lock.lock(); |
| assertLockedByMoi(lock); |
| releaseLock(lock); |
| } |
| |
| /** |
| * Unlocking an unlocked lock throws IllegalMonitorStateException |
| */ |
| public void testUnlock_IMSE() { testUnlock_IMSE(false); } |
| public void testUnlock_IMSE_fair() { testUnlock_IMSE(true); } |
| public void testUnlock_IMSE(boolean fair) { |
| ReentrantLock lock = new ReentrantLock(fair); |
| try { |
| lock.unlock(); |
| shouldThrow(); |
| } catch (IllegalMonitorStateException success) {} |
| } |
| |
| /** |
| * tryLock on an unlocked lock succeeds |
| */ |
| public void testTryLock() { testTryLock(false); } |
| public void testTryLock_fair() { testTryLock(true); } |
| public void testTryLock(boolean fair) { |
| PublicReentrantLock lock = new PublicReentrantLock(fair); |
| assertTrue(lock.tryLock()); |
| assertLockedByMoi(lock); |
| assertTrue(lock.tryLock()); |
| assertLockedByMoi(lock); |
| lock.unlock(); |
| releaseLock(lock); |
| } |
| |
| /** |
| * hasQueuedThreads reports whether there are waiting threads |
| */ |
| public void testHasQueuedThreads() { testHasQueuedThreads(false); } |
| public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); } |
| public void testHasQueuedThreads(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
| Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
| assertFalse(lock.hasQueuedThreads()); |
| lock.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.unlock(); |
| awaitTermination(t2); |
| assertFalse(lock.hasQueuedThreads()); |
| } |
| |
| /** |
| * getQueueLength reports number of waiting threads |
| */ |
| public void testGetQueueLength() { testGetQueueLength(false); } |
| public void testGetQueueLength_fair() { testGetQueueLength(true); } |
| public void testGetQueueLength(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
| Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
| assertEquals(0, lock.getQueueLength()); |
| lock.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.unlock(); |
| awaitTermination(t2); |
| assertEquals(0, lock.getQueueLength()); |
| } |
| |
| /** |
| * hasQueuedThread(null) throws NPE |
| */ |
| public void testHasQueuedThreadNPE() { testHasQueuedThreadNPE(false); } |
| public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); } |
| public void testHasQueuedThreadNPE(boolean fair) { |
| final ReentrantLock lock = new ReentrantLock(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 PublicReentrantLock lock = new PublicReentrantLock(fair); |
| Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
| Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
| assertFalse(lock.hasQueuedThread(t1)); |
| assertFalse(lock.hasQueuedThread(t2)); |
| lock.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.unlock(); |
| awaitTermination(t2); |
| assertFalse(lock.hasQueuedThread(t1)); |
| assertFalse(lock.hasQueuedThread(t2)); |
| } |
| |
| /** |
| * getQueuedThreads includes waiting threads |
| */ |
| public void testGetQueuedThreads() { testGetQueuedThreads(false); } |
| public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); } |
| public void testGetQueuedThreads(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| Thread t1 = new Thread(new InterruptedLockRunnable(lock)); |
| Thread t2 = new Thread(new InterruptibleLockRunnable(lock)); |
| assertTrue(lock.getQueuedThreads().isEmpty()); |
| lock.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.unlock(); |
| awaitTermination(t2); |
| assertTrue(lock.getQueuedThreads().isEmpty()); |
| } |
| |
| /** |
| * timed tryLock is interruptible |
| */ |
| public void testTryLock_Interruptible() { testTryLock_Interruptible(false); } |
| public void testTryLock_Interruptible_fair() { testTryLock_Interruptible(true); } |
| public void testTryLock_Interruptible(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| lock.lock(); |
| Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.tryLock(2 * LONG_DELAY_MS, MILLISECONDS); |
| }}); |
| |
| waitForQueuedThread(lock, t); |
| t.interrupt(); |
| awaitTermination(t); |
| releaseLock(lock); |
| } |
| |
| /** |
| * tryLock on a locked lock fails |
| */ |
| public void testTryLockWhenLocked() { testTryLockWhenLocked(false); } |
| public void testTryLockWhenLocked_fair() { testTryLockWhenLocked(true); } |
| public void testTryLockWhenLocked(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| lock.lock(); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() { |
| assertFalse(lock.tryLock()); |
| }}); |
| |
| awaitTermination(t); |
| releaseLock(lock); |
| } |
| |
| /** |
| * Timed tryLock on a locked lock times out |
| */ |
| public void testTryLock_Timeout() { testTryLock_Timeout(false); } |
| public void testTryLock_Timeout_fair() { testTryLock_Timeout(true); } |
| public void testTryLock_Timeout(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| lock.lock(); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| long startTime = System.nanoTime(); |
| long timeoutMillis = 10; |
| assertFalse(lock.tryLock(timeoutMillis, MILLISECONDS)); |
| assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
| }}); |
| |
| awaitTermination(t); |
| releaseLock(lock); |
| } |
| |
| /** |
| * getHoldCount returns number of recursive holds |
| */ |
| public void testGetHoldCount() { testGetHoldCount(false); } |
| public void testGetHoldCount_fair() { testGetHoldCount(true); } |
| public void testGetHoldCount(boolean fair) { |
| ReentrantLock lock = new ReentrantLock(fair); |
| for (int i = 1; i <= SIZE; i++) { |
| lock.lock(); |
| assertEquals(i, lock.getHoldCount()); |
| } |
| for (int i = SIZE; i > 0; i--) { |
| lock.unlock(); |
| assertEquals(i - 1, lock.getHoldCount()); |
| } |
| } |
| |
| /** |
| * isLocked is true when locked and false when not |
| */ |
| public void testIsLocked() { testIsLocked(false); } |
| public void testIsLocked_fair() { testIsLocked(true); } |
| public void testIsLocked(boolean fair) { |
| try { |
| final ReentrantLock lock = new ReentrantLock(fair); |
| assertFalse(lock.isLocked()); |
| lock.lock(); |
| assertTrue(lock.isLocked()); |
| lock.lock(); |
| assertTrue(lock.isLocked()); |
| lock.unlock(); |
| assertTrue(lock.isLocked()); |
| lock.unlock(); |
| assertFalse(lock.isLocked()); |
| final CyclicBarrier barrier = new CyclicBarrier(2); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws Exception { |
| lock.lock(); |
| assertTrue(lock.isLocked()); |
| barrier.await(); |
| barrier.await(); |
| lock.unlock(); |
| }}); |
| |
| barrier.await(); |
| assertTrue(lock.isLocked()); |
| barrier.await(); |
| awaitTermination(t); |
| assertFalse(lock.isLocked()); |
| } catch (Exception fail) { threadUnexpectedException(fail); } |
| } |
| |
| /** |
| * lockInterruptibly succeeds when unlocked, else is interruptible |
| */ |
| public void testLockInterruptibly() { testLockInterruptibly(false); } |
| public void testLockInterruptibly_fair() { testLockInterruptibly(true); } |
| public void testLockInterruptibly(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| try { |
| lock.lockInterruptibly(); |
| } catch (InterruptedException fail) { threadUnexpectedException(fail); } |
| assertLockedByMoi(lock); |
| Thread t = newStartedThread(new InterruptedLockRunnable(lock)); |
| waitForQueuedThread(lock, t); |
| t.interrupt(); |
| assertTrue(lock.isLocked()); |
| assertTrue(lock.isHeldByCurrentThread()); |
| awaitTermination(t); |
| releaseLock(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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| try { |
| c.signal(); |
| 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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| lock.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.unlock(); |
| } catch (InterruptedException fail) { threadUnexpectedException(fail); } |
| } |
| |
| /** |
| * 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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| lock.lock(); |
| long startTime = System.nanoTime(); |
| long timeoutMillis = 10; |
| assertFalse(c.await(timeoutMillis, MILLISECONDS)); |
| assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
| lock.unlock(); |
| } catch (InterruptedException fail) { threadUnexpectedException(fail); } |
| } |
| |
| /** |
| * 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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| lock.lock(); |
| // We shouldn't assume that nanoTime and currentTimeMillis |
| // use the same time source, so don't use nanoTime here. |
| java.util.Date delayedDate = delayedDate(timeoutMillis()); |
| assertFalse(c.awaitUntil(delayedDate)); |
| assertTrue(new java.util.Date().getTime() >= delayedDate.getTime()); |
| lock.unlock(); |
| } catch (InterruptedException fail) { threadUnexpectedException(fail); } |
| } |
| |
| /** |
| * await returns when signalled |
| */ |
| public void testAwait() { testAwait(false); } |
| public void testAwait_fair() { testAwait(true); } |
| public void testAwait(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final CountDownLatch locked = new CountDownLatch(1); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| locked.countDown(); |
| c.await(); |
| lock.unlock(); |
| }}); |
| |
| await(locked); |
| lock.lock(); |
| assertHasWaiters(lock, c, t); |
| c.signal(); |
| assertHasNoWaiters(lock, c); |
| assertTrue(t.isAlive()); |
| lock.unlock(); |
| awaitTermination(t); |
| } |
| |
| /** |
| * hasWaiters throws NPE if null |
| */ |
| public void testHasWaitersNPE() { testHasWaitersNPE(false); } |
| public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); } |
| public void testHasWaitersNPE(boolean fair) { |
| final ReentrantLock lock = new ReentrantLock(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 ReentrantLock lock = new ReentrantLock(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 PublicReentrantLock lock = new PublicReentrantLock(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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final ReentrantLock lock2 = new ReentrantLock(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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final ReentrantLock lock2 = new ReentrantLock(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 ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.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 PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final PublicReentrantLock lock2 = new PublicReentrantLock(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 PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.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 PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final CountDownLatch pleaseSignal = new CountDownLatch(1); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| assertHasNoWaiters(lock, c); |
| assertFalse(lock.hasWaiters(c)); |
| pleaseSignal.countDown(); |
| c.await(); |
| assertHasNoWaiters(lock, c); |
| assertFalse(lock.hasWaiters(c)); |
| lock.unlock(); |
| }}); |
| |
| await(pleaseSignal); |
| lock.lock(); |
| assertHasWaiters(lock, c, t); |
| assertTrue(lock.hasWaiters(c)); |
| c.signal(); |
| assertHasNoWaiters(lock, c); |
| assertFalse(lock.hasWaiters(c)); |
| lock.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 PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.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.lock(); |
| assertFalse(lock.hasWaiters(c)); |
| assertEquals(0, lock.getWaitQueueLength(c)); |
| locked1.countDown(); |
| c.await(); |
| lock.unlock(); |
| }}); |
| |
| Thread t2 = new Thread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| assertTrue(lock.hasWaiters(c)); |
| assertEquals(1, lock.getWaitQueueLength(c)); |
| locked2.countDown(); |
| c.await(); |
| lock.unlock(); |
| }}); |
| |
| lock.lock(); |
| assertEquals(0, lock.getWaitQueueLength(c)); |
| lock.unlock(); |
| |
| t1.start(); |
| await(locked1); |
| |
| lock.lock(); |
| assertHasWaiters(lock, c, t1); |
| assertEquals(1, lock.getWaitQueueLength(c)); |
| lock.unlock(); |
| |
| t2.start(); |
| await(locked2); |
| |
| lock.lock(); |
| assertHasWaiters(lock, c, t1, t2); |
| assertEquals(2, lock.getWaitQueueLength(c)); |
| c.signalAll(); |
| assertHasNoWaiters(lock, c); |
| lock.unlock(); |
| |
| awaitTermination(t1); |
| awaitTermination(t2); |
| |
| assertHasNoWaiters(lock, c); |
| } |
| |
| /** |
| * getWaitingThreads returns only and all waiting threads |
| */ |
| public void testGetWaitingThreads() { testGetWaitingThreads(false); } |
| public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); } |
| public void testGetWaitingThreads(boolean fair) { |
| final PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.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.lock(); |
| assertTrue(lock.getWaitingThreads(c).isEmpty()); |
| locked1.countDown(); |
| c.await(); |
| lock.unlock(); |
| }}); |
| |
| Thread t2 = new Thread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| assertFalse(lock.getWaitingThreads(c).isEmpty()); |
| locked2.countDown(); |
| c.await(); |
| lock.unlock(); |
| }}); |
| |
| lock.lock(); |
| assertTrue(lock.getWaitingThreads(c).isEmpty()); |
| lock.unlock(); |
| |
| t1.start(); |
| await(locked1); |
| |
| lock.lock(); |
| assertHasWaiters(lock, c, t1); |
| assertTrue(lock.getWaitingThreads(c).contains(t1)); |
| assertFalse(lock.getWaitingThreads(c).contains(t2)); |
| assertEquals(1, lock.getWaitingThreads(c).size()); |
| lock.unlock(); |
| |
| t2.start(); |
| await(locked2); |
| |
| lock.lock(); |
| assertHasWaiters(lock, c, t1, t2); |
| assertTrue(lock.getWaitingThreads(c).contains(t1)); |
| assertTrue(lock.getWaitingThreads(c).contains(t2)); |
| assertEquals(2, lock.getWaitingThreads(c).size()); |
| c.signalAll(); |
| assertHasNoWaiters(lock, c); |
| lock.unlock(); |
| |
| awaitTermination(t1); |
| awaitTermination(t2); |
| |
| assertHasNoWaiters(lock, c); |
| } |
| |
| /** |
| * awaitUninterruptibly is uninterruptible |
| */ |
| public void testAwaitUninterruptibly() { testAwaitUninterruptibly(false); } |
| public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); } |
| public void testAwaitUninterruptibly(boolean fair) { |
| final ReentrantLock lock = new ReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final CountDownLatch pleaseInterrupt = new CountDownLatch(2); |
| |
| Thread t1 = newStartedThread(new CheckedRunnable() { |
| public void realRun() { |
| // Interrupt before awaitUninterruptibly |
| lock.lock(); |
| pleaseInterrupt.countDown(); |
| Thread.currentThread().interrupt(); |
| c.awaitUninterruptibly(); |
| assertTrue(Thread.interrupted()); |
| lock.unlock(); |
| }}); |
| |
| Thread t2 = newStartedThread(new CheckedRunnable() { |
| public void realRun() { |
| // Interrupt during awaitUninterruptibly |
| lock.lock(); |
| pleaseInterrupt.countDown(); |
| c.awaitUninterruptibly(); |
| assertTrue(Thread.interrupted()); |
| lock.unlock(); |
| }}); |
| |
| await(pleaseInterrupt); |
| lock.lock(); |
| lock.unlock(); |
| t2.interrupt(); |
| |
| assertThreadStaysAlive(t1); |
| assertTrue(t2.isAlive()); |
| |
| lock.lock(); |
| c.signalAll(); |
| lock.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 PublicReentrantLock lock = |
| new PublicReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| assertLockedByMoi(lock); |
| assertHasNoWaiters(lock, c); |
| pleaseInterrupt.countDown(); |
| try { |
| await(c, awaitMethod); |
| } finally { |
| assertLockedByMoi(lock); |
| assertHasNoWaiters(lock, c); |
| lock.unlock(); |
| assertFalse(Thread.interrupted()); |
| } |
| }}); |
| |
| await(pleaseInterrupt); |
| assertHasWaiters(lock, c, t); |
| t.interrupt(); |
| awaitTermination(t); |
| assertNotLocked(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 PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final CountDownLatch pleaseSignal = new CountDownLatch(2); |
| class Awaiter extends CheckedRunnable { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| pleaseSignal.countDown(); |
| await(c, awaitMethod); |
| lock.unlock(); |
| } |
| } |
| |
| Thread t1 = newStartedThread(new Awaiter()); |
| Thread t2 = newStartedThread(new Awaiter()); |
| |
| await(pleaseSignal); |
| lock.lock(); |
| assertHasWaiters(lock, c, t1, t2); |
| c.signalAll(); |
| assertHasNoWaiters(lock, c); |
| lock.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 PublicReentrantLock lock = |
| new PublicReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final CountDownLatch locked1 = new CountDownLatch(1); |
| final CountDownLatch locked2 = new CountDownLatch(1); |
| Thread t1 = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| locked1.countDown(); |
| c.await(); |
| lock.unlock(); |
| }}); |
| |
| await(locked1); |
| |
| Thread t2 = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| locked2.countDown(); |
| c.await(); |
| lock.unlock(); |
| }}); |
| |
| await(locked2); |
| |
| lock.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)); |
| lock.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 PublicReentrantLock lock = new PublicReentrantLock(fair); |
| final Condition c = lock.newCondition(); |
| final CountDownLatch pleaseSignal = new CountDownLatch(2); |
| Thread t1 = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| assertLockedByMoi(lock); |
| assertEquals(1, lock.getHoldCount()); |
| pleaseSignal.countDown(); |
| c.await(); |
| assertLockedByMoi(lock); |
| assertEquals(1, lock.getHoldCount()); |
| lock.unlock(); |
| }}); |
| |
| Thread t2 = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| lock.lock(); |
| lock.lock(); |
| assertLockedByMoi(lock); |
| assertEquals(2, lock.getHoldCount()); |
| pleaseSignal.countDown(); |
| c.await(); |
| assertLockedByMoi(lock); |
| assertEquals(2, lock.getHoldCount()); |
| lock.unlock(); |
| lock.unlock(); |
| }}); |
| |
| await(pleaseSignal); |
| lock.lock(); |
| assertHasWaiters(lock, c, t1, t2); |
| assertEquals(1, lock.getHoldCount()); |
| c.signalAll(); |
| assertHasNoWaiters(lock, c); |
| lock.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) { |
| ReentrantLock lock = new ReentrantLock(fair); |
| lock.lock(); |
| |
| ReentrantLock clone = serialClone(lock); |
| assertEquals(lock.isFair(), clone.isFair()); |
| assertTrue(lock.isLocked()); |
| assertFalse(clone.isLocked()); |
| assertEquals(1, lock.getHoldCount()); |
| assertEquals(0, clone.getHoldCount()); |
| clone.lock(); |
| clone.lock(); |
| assertTrue(clone.isLocked()); |
| assertEquals(2, clone.getHoldCount()); |
| assertEquals(1, lock.getHoldCount()); |
| clone.unlock(); |
| clone.unlock(); |
| assertTrue(lock.isLocked()); |
| assertFalse(clone.isLocked()); |
| } |
| |
| /** |
| * toString indicates current lock state |
| */ |
| public void testToString() { testToString(false); } |
| public void testToString_fair() { testToString(true); } |
| public void testToString(boolean fair) { |
| ReentrantLock lock = new ReentrantLock(fair); |
| assertTrue(lock.toString().contains("Unlocked")); |
| lock.lock(); |
| assertTrue(lock.toString().contains("Locked")); |
| lock.unlock(); |
| assertTrue(lock.toString().contains("Unlocked")); |
| } |
| } |