jsr166-mirror.jsr166tck.1.7.0.source-code.AbstractQueuedSynchronizerTest Maven / Gradle / Ivy
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/*
* 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.
*/
import junit.framework.*;
import java.util.*;
import java.util.concurrent.*;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.concurrent.locks.*;
import java.io.*;
public class AbstractQueuedSynchronizerTest extends JSR166TestCase {
public static void main(String[] args) {
junit.textui.TestRunner.run(suite());
}
public static Test suite() {
return new TestSuite(AbstractQueuedSynchronizerTest.class);
}
/**
* A simple mutex class, adapted from the
* AbstractQueuedSynchronizer javadoc. Exclusive acquire tests
* exercise this as a sample user extension. Other
* methods/features of AbstractQueuedSynchronizerTest are tested
* via other test classes, including those for ReentrantLock,
* ReentrantReadWriteLock, and Semaphore
*/
static class Mutex extends AbstractQueuedSynchronizer {
public boolean isHeldExclusively() { return getState() == 1; }
public boolean tryAcquire(int acquires) {
assertEquals(1, acquires);
return compareAndSetState(0, 1);
}
public boolean tryRelease(int releases) {
if (getState() == 0) throw new IllegalMonitorStateException();
setState(0);
return true;
}
public AbstractQueuedSynchronizer.ConditionObject newCondition() {
return new AbstractQueuedSynchronizer.ConditionObject();
}
}
/**
* A simple latch class, to test shared mode.
*/
static class BooleanLatch extends AbstractQueuedSynchronizer {
public boolean isSignalled() { return getState() != 0; }
public int tryAcquireShared(int ignore) {
return isSignalled() ? 1 : -1;
}
public boolean tryReleaseShared(int ignore) {
setState(1);
return true;
}
}
/**
* A runnable calling acquireInterruptibly that does not expect to
* be interrupted.
*/
class InterruptibleSyncRunnable extends CheckedRunnable {
final Mutex sync;
InterruptibleSyncRunnable(Mutex l) { sync = l; }
public void realRun() throws InterruptedException {
sync.acquireInterruptibly(1);
}
}
/**
* A runnable calling acquireInterruptibly that expects to be
* interrupted.
*/
class InterruptedSyncRunnable extends CheckedInterruptedRunnable {
final Mutex sync;
InterruptedSyncRunnable(Mutex l) { sync = l; }
public void realRun() throws InterruptedException {
sync.acquireInterruptibly(1);
}
}
/**
* isHeldExclusively is false upon construction
*/
public void testIsHeldExclusively() {
Mutex rl = new Mutex();
assertFalse(rl.isHeldExclusively());
}
/**
* acquiring released sync succeeds
*/
public void testAcquire() {
Mutex rl = new Mutex();
rl.acquire(1);
assertTrue(rl.isHeldExclusively());
rl.release(1);
assertFalse(rl.isHeldExclusively());
}
/**
* tryAcquire on an released sync succeeds
*/
public void testTryAcquire() {
Mutex rl = new Mutex();
assertTrue(rl.tryAcquire(1));
assertTrue(rl.isHeldExclusively());
rl.release(1);
}
/**
* hasQueuedThreads reports whether there are waiting threads
*/
public void testhasQueuedThreads() throws InterruptedException {
final Mutex sync = new Mutex();
Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
assertFalse(sync.hasQueuedThreads());
sync.acquire(1);
t1.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.hasQueuedThreads());
t2.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.hasQueuedThreads());
t1.interrupt();
delay(SHORT_DELAY_MS);
assertTrue(sync.hasQueuedThreads());
sync.release(1);
delay(SHORT_DELAY_MS);
assertFalse(sync.hasQueuedThreads());
t1.join();
t2.join();
}
/**
* isQueued(null) throws NPE
*/
public void testIsQueuedNPE() {
final Mutex sync = new Mutex();
try {
sync.isQueued(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* isQueued reports whether a thread is queued.
*/
public void testIsQueued() throws InterruptedException {
final Mutex sync = new Mutex();
Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
assertFalse(sync.isQueued(t1));
assertFalse(sync.isQueued(t2));
sync.acquire(1);
t1.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.isQueued(t1));
t2.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.isQueued(t1));
assertTrue(sync.isQueued(t2));
t1.interrupt();
delay(SHORT_DELAY_MS);
assertFalse(sync.isQueued(t1));
assertTrue(sync.isQueued(t2));
sync.release(1);
delay(SHORT_DELAY_MS);
assertFalse(sync.isQueued(t1));
delay(SHORT_DELAY_MS);
assertFalse(sync.isQueued(t2));
t1.join();
t2.join();
}
/**
* getFirstQueuedThread returns first waiting thread or null if none
*/
public void testGetFirstQueuedThread() throws InterruptedException {
final Mutex sync = new Mutex();
Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
assertNull(sync.getFirstQueuedThread());
sync.acquire(1);
t1.start();
delay(SHORT_DELAY_MS);
assertEquals(t1, sync.getFirstQueuedThread());
t2.start();
delay(SHORT_DELAY_MS);
assertEquals(t1, sync.getFirstQueuedThread());
t1.interrupt();
delay(SHORT_DELAY_MS);
delay(SHORT_DELAY_MS);
assertEquals(t2, sync.getFirstQueuedThread());
sync.release(1);
delay(SHORT_DELAY_MS);
assertNull(sync.getFirstQueuedThread());
t1.join();
t2.join();
}
/**
* hasContended reports false if no thread has ever blocked, else true
*/
public void testHasContended() throws InterruptedException {
final Mutex sync = new Mutex();
Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
assertFalse(sync.hasContended());
sync.acquire(1);
t1.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.hasContended());
t2.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.hasContended());
t1.interrupt();
delay(SHORT_DELAY_MS);
assertTrue(sync.hasContended());
sync.release(1);
delay(SHORT_DELAY_MS);
assertTrue(sync.hasContended());
t1.join();
t2.join();
}
/**
* getQueuedThreads includes waiting threads
*/
public void testGetQueuedThreads() throws InterruptedException {
final Mutex sync = new Mutex();
Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
assertTrue(sync.getQueuedThreads().isEmpty());
sync.acquire(1);
assertTrue(sync.getQueuedThreads().isEmpty());
t1.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.getQueuedThreads().contains(t1));
t2.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.getQueuedThreads().contains(t1));
assertTrue(sync.getQueuedThreads().contains(t2));
t1.interrupt();
delay(SHORT_DELAY_MS);
assertFalse(sync.getQueuedThreads().contains(t1));
assertTrue(sync.getQueuedThreads().contains(t2));
sync.release(1);
delay(SHORT_DELAY_MS);
assertTrue(sync.getQueuedThreads().isEmpty());
t1.join();
t2.join();
}
/**
* getExclusiveQueuedThreads includes waiting threads
*/
public void testGetExclusiveQueuedThreads() throws InterruptedException {
final Mutex sync = new Mutex();
Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
assertTrue(sync.getExclusiveQueuedThreads().isEmpty());
sync.acquire(1);
assertTrue(sync.getExclusiveQueuedThreads().isEmpty());
t1.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
t2.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.getExclusiveQueuedThreads().contains(t1));
assertTrue(sync.getExclusiveQueuedThreads().contains(t2));
t1.interrupt();
delay(SHORT_DELAY_MS);
assertFalse(sync.getExclusiveQueuedThreads().contains(t1));
assertTrue(sync.getExclusiveQueuedThreads().contains(t2));
sync.release(1);
delay(SHORT_DELAY_MS);
assertTrue(sync.getExclusiveQueuedThreads().isEmpty());
t1.join();
t2.join();
}
/**
* getSharedQueuedThreads does not include exclusively waiting threads
*/
public void testGetSharedQueuedThreads() throws InterruptedException {
final Mutex sync = new Mutex();
Thread t1 = new Thread(new InterruptedSyncRunnable(sync));
Thread t2 = new Thread(new InterruptibleSyncRunnable(sync));
assertTrue(sync.getSharedQueuedThreads().isEmpty());
sync.acquire(1);
assertTrue(sync.getSharedQueuedThreads().isEmpty());
t1.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.getSharedQueuedThreads().isEmpty());
t2.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.getSharedQueuedThreads().isEmpty());
t1.interrupt();
delay(SHORT_DELAY_MS);
assertTrue(sync.getSharedQueuedThreads().isEmpty());
sync.release(1);
delay(SHORT_DELAY_MS);
assertTrue(sync.getSharedQueuedThreads().isEmpty());
t1.join();
t2.join();
}
/**
* tryAcquireNanos is interruptible.
*/
public void testInterruptedException2() throws InterruptedException {
final Mutex sync = new Mutex();
sync.acquire(1);
Thread t = new Thread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
sync.tryAcquireNanos(1, MILLISECONDS.toNanos(MEDIUM_DELAY_MS));
}});
t.start();
delay(SHORT_DELAY_MS);
t.interrupt();
t.join();
}
/**
* TryAcquire on exclusively held sync fails
*/
public void testTryAcquireWhenSynced() throws InterruptedException {
final Mutex sync = new Mutex();
sync.acquire(1);
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
assertFalse(sync.tryAcquire(1));
}});
t.start();
t.join();
sync.release(1);
}
/**
* tryAcquireNanos on an exclusively held sync times out
*/
public void testAcquireNanos_Timeout() throws InterruptedException {
final Mutex sync = new Mutex();
sync.acquire(1);
Thread t = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
long nanos = MILLISECONDS.toNanos(SHORT_DELAY_MS);
assertFalse(sync.tryAcquireNanos(1, nanos));
}});
t.start();
t.join();
sync.release(1);
}
/**
* getState is true when acquired and false when not
*/
public void testGetState() throws InterruptedException {
final Mutex sync = new Mutex();
sync.acquire(1);
assertTrue(sync.isHeldExclusively());
sync.release(1);
assertFalse(sync.isHeldExclusively());
Thread t = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
delay(SMALL_DELAY_MS);
sync.release(1);
}});
t.start();
delay(SHORT_DELAY_MS);
assertTrue(sync.isHeldExclusively());
t.join();
assertFalse(sync.isHeldExclusively());
}
/**
* acquireInterruptibly is interruptible.
*/
public void testAcquireInterruptibly1() throws InterruptedException {
final Mutex sync = new Mutex();
sync.acquire(1);
Thread t = new Thread(new InterruptedSyncRunnable(sync));
t.start();
delay(SHORT_DELAY_MS);
t.interrupt();
delay(SHORT_DELAY_MS);
sync.release(1);
t.join();
}
/**
* acquireInterruptibly succeeds when released, else is interruptible
*/
public void testAcquireInterruptibly2() throws InterruptedException {
final Mutex sync = new Mutex();
sync.acquireInterruptibly(1);
Thread t = new Thread(new InterruptedSyncRunnable(sync));
t.start();
delay(SHORT_DELAY_MS);
t.interrupt();
assertTrue(sync.isHeldExclusively());
t.join();
}
/**
* owns is true for a condition created by sync else false
*/
public void testOwns() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
final Mutex sync2 = new Mutex();
assertTrue(sync.owns(c));
assertFalse(sync2.owns(c));
}
/**
* Calling await without holding sync throws IllegalMonitorStateException
*/
public void testAwait_IllegalMonitor() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
try {
c.await();
shouldThrow();
} catch (IllegalMonitorStateException success) {}
}
/**
* Calling signal without holding sync throws IllegalMonitorStateException
*/
public void testSignal_IllegalMonitor() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
try {
c.signal();
shouldThrow();
} catch (IllegalMonitorStateException success) {}
}
/**
* awaitNanos without a signal times out
*/
public void testAwaitNanos_Timeout() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
sync.acquire(1);
long t = c.awaitNanos(100);
assertTrue(t <= 0);
sync.release(1);
}
/**
* Timed await without a signal times out
*/
public void testAwait_Timeout() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
sync.acquire(1);
assertFalse(c.await(SHORT_DELAY_MS, MILLISECONDS));
sync.release(1);
}
/**
* awaitUntil without a signal times out
*/
public void testAwaitUntil_Timeout() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
sync.acquire(1);
java.util.Date d = new java.util.Date();
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10)));
sync.release(1);
}
/**
* await returns when signalled
*/
public void testAwait() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
c.await();
sync.release(1);
}});
t.start();
delay(SHORT_DELAY_MS);
sync.acquire(1);
c.signal();
sync.release(1);
t.join(SHORT_DELAY_MS);
assertFalse(t.isAlive());
}
/**
* hasWaiters throws NPE if null
*/
public void testHasWaitersNPE() {
final Mutex sync = new Mutex();
try {
sync.hasWaiters(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* getWaitQueueLength throws NPE if null
*/
public void testGetWaitQueueLengthNPE() {
final Mutex sync = new Mutex();
try {
sync.getWaitQueueLength(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* getWaitingThreads throws NPE if null
*/
public void testGetWaitingThreadsNPE() {
final Mutex sync = new Mutex();
try {
sync.getWaitingThreads(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* hasWaiters throws IAE if not owned
*/
public void testHasWaitersIAE() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
final Mutex sync2 = new Mutex();
try {
sync2.hasWaiters(c);
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* hasWaiters throws IMSE if not synced
*/
public void testHasWaitersIMSE() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
try {
sync.hasWaiters(c);
shouldThrow();
} catch (IllegalMonitorStateException success) {}
}
/**
* getWaitQueueLength throws IAE if not owned
*/
public void testGetWaitQueueLengthIAE() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
final Mutex sync2 = new Mutex();
try {
sync2.getWaitQueueLength(c);
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* getWaitQueueLength throws IMSE if not synced
*/
public void testGetWaitQueueLengthIMSE() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
try {
sync.getWaitQueueLength(c);
shouldThrow();
} catch (IllegalMonitorStateException success) {}
}
/**
* getWaitingThreads throws IAE if not owned
*/
public void testGetWaitingThreadsIAE() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
final Mutex sync2 = new Mutex();
try {
sync2.getWaitingThreads(c);
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* getWaitingThreads throws IMSE if not synced
*/
public void testGetWaitingThreadsIMSE() {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
try {
sync.getWaitingThreads(c);
shouldThrow();
} catch (IllegalMonitorStateException success) {}
}
/**
* hasWaiters returns true when a thread is waiting, else false
*/
public void testHasWaiters() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
assertFalse(sync.hasWaiters(c));
assertEquals(0, sync.getWaitQueueLength(c));
c.await();
sync.release(1);
}});
t.start();
delay(SHORT_DELAY_MS);
sync.acquire(1);
assertTrue(sync.hasWaiters(c));
assertEquals(1, sync.getWaitQueueLength(c));
c.signal();
sync.release(1);
delay(SHORT_DELAY_MS);
sync.acquire(1);
assertFalse(sync.hasWaiters(c));
assertEquals(0, sync.getWaitQueueLength(c));
sync.release(1);
t.join(SHORT_DELAY_MS);
assertFalse(t.isAlive());
}
/**
* getWaitQueueLength returns number of waiting threads
*/
public void testGetWaitQueueLength() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t1 = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
assertFalse(sync.hasWaiters(c));
assertEquals(0, sync.getWaitQueueLength(c));
c.await();
sync.release(1);
}});
Thread t2 = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
assertTrue(sync.hasWaiters(c));
assertEquals(1, sync.getWaitQueueLength(c));
c.await();
sync.release(1);
}});
t1.start();
delay(SHORT_DELAY_MS);
t2.start();
delay(SHORT_DELAY_MS);
sync.acquire(1);
assertTrue(sync.hasWaiters(c));
assertEquals(2, sync.getWaitQueueLength(c));
c.signalAll();
sync.release(1);
delay(SHORT_DELAY_MS);
sync.acquire(1);
assertFalse(sync.hasWaiters(c));
assertEquals(0, sync.getWaitQueueLength(c));
sync.release(1);
t1.join(SHORT_DELAY_MS);
t2.join(SHORT_DELAY_MS);
assertFalse(t1.isAlive());
assertFalse(t2.isAlive());
}
/**
* getWaitingThreads returns only and all waiting threads
*/
public void testGetWaitingThreads() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t1 = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
assertTrue(sync.getWaitingThreads(c).isEmpty());
c.await();
sync.release(1);
}});
Thread t2 = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
assertFalse(sync.getWaitingThreads(c).isEmpty());
c.await();
sync.release(1);
}});
sync.acquire(1);
assertTrue(sync.getWaitingThreads(c).isEmpty());
sync.release(1);
t1.start();
delay(SHORT_DELAY_MS);
t2.start();
delay(SHORT_DELAY_MS);
sync.acquire(1);
assertTrue(sync.hasWaiters(c));
assertTrue(sync.getWaitingThreads(c).contains(t1));
assertTrue(sync.getWaitingThreads(c).contains(t2));
c.signalAll();
sync.release(1);
delay(SHORT_DELAY_MS);
sync.acquire(1);
assertFalse(sync.hasWaiters(c));
assertTrue(sync.getWaitingThreads(c).isEmpty());
sync.release(1);
t1.join(SHORT_DELAY_MS);
t2.join(SHORT_DELAY_MS);
assertFalse(t1.isAlive());
assertFalse(t2.isAlive());
}
/**
* awaitUninterruptibly doesn't abort on interrupt
*/
public void testAwaitUninterruptibly() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
sync.acquire(1);
c.awaitUninterruptibly();
sync.release(1);
}});
t.start();
delay(SHORT_DELAY_MS);
t.interrupt();
sync.acquire(1);
c.signal();
sync.release(1);
t.join(SHORT_DELAY_MS);
assertFalse(t.isAlive());
}
/**
* await is interruptible
*/
public void testAwait_Interrupt() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t = new Thread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
c.await();
}});
t.start();
delay(SHORT_DELAY_MS);
t.interrupt();
t.join(SHORT_DELAY_MS);
assertFalse(t.isAlive());
}
/**
* awaitNanos is interruptible
*/
public void testAwaitNanos_Interrupt() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t = new Thread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
c.awaitNanos(MILLISECONDS.toNanos(LONG_DELAY_MS));
}});
t.start();
delay(SHORT_DELAY_MS);
t.interrupt();
t.join(SHORT_DELAY_MS);
assertFalse(t.isAlive());
}
/**
* awaitUntil is interruptible
*/
public void testAwaitUntil_Interrupt() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t = new Thread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
java.util.Date d = new java.util.Date();
c.awaitUntil(new java.util.Date(d.getTime() + 10000));
}});
t.start();
delay(SHORT_DELAY_MS);
t.interrupt();
t.join(SHORT_DELAY_MS);
assertFalse(t.isAlive());
}
/**
* signalAll wakes up all threads
*/
public void testSignalAll() throws InterruptedException {
final Mutex sync = new Mutex();
final AbstractQueuedSynchronizer.ConditionObject c = sync.newCondition();
Thread t1 = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
c.await();
sync.release(1);
}});
Thread t2 = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
sync.acquire(1);
c.await();
sync.release(1);
}});
t1.start();
t2.start();
delay(SHORT_DELAY_MS);
sync.acquire(1);
c.signalAll();
sync.release(1);
t1.join(SHORT_DELAY_MS);
t2.join(SHORT_DELAY_MS);
assertFalse(t1.isAlive());
assertFalse(t2.isAlive());
}
/**
* toString indicates current state
*/
public void testToString() {
Mutex sync = new Mutex();
String us = sync.toString();
assertTrue(us.indexOf("State = 0") >= 0);
sync.acquire(1);
String ls = sync.toString();
assertTrue(ls.indexOf("State = 1") >= 0);
}
/**
* A serialized AQS deserializes with current state
*/
public void testSerialization() throws Exception {
Mutex l = new Mutex();
l.acquire(1);
assertTrue(l.isHeldExclusively());
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
out.writeObject(l);
out.close();
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
Mutex r = (Mutex) in.readObject();
assertTrue(r.isHeldExclusively());
}
/**
* tryReleaseShared setting state changes getState
*/
public void testGetStateWithReleaseShared() {
final BooleanLatch l = new BooleanLatch();
assertFalse(l.isSignalled());
l.releaseShared(0);
assertTrue(l.isSignalled());
}
/**
* releaseShared has no effect when already signalled
*/
public void testReleaseShared() {
final BooleanLatch l = new BooleanLatch();
assertFalse(l.isSignalled());
l.releaseShared(0);
assertTrue(l.isSignalled());
l.releaseShared(0);
assertTrue(l.isSignalled());
}
/**
* acquireSharedInterruptibly returns after release, but not before
*/
public void testAcquireSharedInterruptibly() throws InterruptedException {
final BooleanLatch l = new BooleanLatch();
Thread t = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
l.acquireSharedInterruptibly(0);
assertTrue(l.isSignalled());
}});
t.start();
assertFalse(l.isSignalled());
delay(SHORT_DELAY_MS);
l.releaseShared(0);
assertTrue(l.isSignalled());
t.join();
}
/**
* acquireSharedTimed returns after release
*/
public void testAcquireSharedTimed() throws InterruptedException {
final BooleanLatch l = new BooleanLatch();
Thread t = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
long nanos = MILLISECONDS.toNanos(MEDIUM_DELAY_MS);
assertTrue(l.tryAcquireSharedNanos(0, nanos));
assertTrue(l.isSignalled());
}});
t.start();
assertFalse(l.isSignalled());
delay(SHORT_DELAY_MS);
l.releaseShared(0);
assertTrue(l.isSignalled());
t.join();
}
/**
* acquireSharedInterruptibly throws IE if interrupted before released
*/
public void testAcquireSharedInterruptibly_InterruptedException() throws InterruptedException {
final BooleanLatch l = new BooleanLatch();
Thread t = new Thread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
l.acquireSharedInterruptibly(0);
}});
t.start();
assertFalse(l.isSignalled());
t.interrupt();
t.join();
}
/**
* acquireSharedTimed throws IE if interrupted before released
*/
public void testAcquireSharedNanos_InterruptedException() throws InterruptedException {
final BooleanLatch l = new BooleanLatch();
Thread t = new Thread(new CheckedInterruptedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
long nanos = MILLISECONDS.toNanos(SMALL_DELAY_MS);
l.tryAcquireSharedNanos(0, nanos);
}});
t.start();
delay(SHORT_DELAY_MS);
assertFalse(l.isSignalled());
t.interrupt();
t.join();
}
/**
* acquireSharedTimed times out if not released before timeout
*/
public void testAcquireSharedNanos_Timeout() throws InterruptedException {
final BooleanLatch l = new BooleanLatch();
Thread t = new Thread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
assertFalse(l.isSignalled());
long nanos = MILLISECONDS.toNanos(SMALL_DELAY_MS);
assertFalse(l.tryAcquireSharedNanos(0, nanos));
}});
t.start();
delay(SHORT_DELAY_MS);
assertFalse(l.isSignalled());
t.join();
}
}
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