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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import static java.util.concurrent.TimeUnit.NANOSECONDS; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.HashSet; |
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import java.util.concurrent.ThreadLocalRandom; |
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import java.util.concurrent.locks.AbstractQueuedSynchronizer; |
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import java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject; |
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import junit.framework.AssertionFailedError; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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|
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@SuppressWarnings("WaitNotInLoop") // we implement spurious-wakeup freedom |
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public class AbstractQueuedSynchronizerTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(AbstractQueuedSynchronizerTest.class); |
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* methods/features of AbstractQueuedSynchronizer are tested via |
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* other test classes, including those for ReentrantLock, |
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* ReentrantReadWriteLock, and Semaphore. |
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* |
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* Unlike the javadoc sample, we don't track owner thread via |
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* AbstractOwnableSynchronizer methods. |
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*/ |
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static class Mutex extends AbstractQueuedSynchronizer { |
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/** An eccentric value for locked synchronizer state. */ |
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|
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static final int UNLOCKED = 0; |
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|
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/** Owner thread is untracked, so this is really just isLocked(). */ |
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@Override public boolean isHeldExclusively() { |
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int state = getState(); |
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assertTrue(state == UNLOCKED || state == LOCKED); |
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return state == LOCKED; |
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} |
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|
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@Override public boolean tryAcquire(int acquires) { |
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@Override protected boolean tryAcquire(int acquires) { |
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assertEquals(LOCKED, acquires); |
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return compareAndSetState(UNLOCKED, LOCKED); |
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} |
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|
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@Override public boolean tryRelease(int releases) { |
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@Override protected boolean tryRelease(int releases) { |
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if (getState() != LOCKED) throw new IllegalMonitorStateException(); |
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assertEquals(LOCKED, releases); |
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setState(UNLOCKED); |
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release(LOCKED); |
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} |
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|
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/** Faux-Implements Lock.newCondition(). */ |
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public ConditionObject newCondition() { |
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return new ConditionObject(); |
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} |
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} |
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|
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/** |
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* A simple latch class, to test shared mode. |
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* A minimal latch class, to test shared mode. |
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*/ |
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static class BooleanLatch extends AbstractQueuedSynchronizer { |
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public boolean isSignalled() { return getState() != 0; } |
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long startTime = System.nanoTime(); |
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while (!sync.isQueued(t)) { |
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if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
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throw new AssertionFailedError("timed out"); |
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throw new AssertionError("timed out"); |
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Thread.yield(); |
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} |
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assertTrue(t.isAlive()); |
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* default timeout duration). |
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*/ |
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void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) { |
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long timeoutMillis = timeoutMillis(); |
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long startTime = System.nanoTime(); |
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final long timeoutMillis = timeoutMillis(); |
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final long startTime; |
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try { |
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switch (awaitMethod) { |
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case awaitTimed: |
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startTime = System.nanoTime(); |
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assertFalse(c.await(timeoutMillis, MILLISECONDS)); |
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assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
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break; |
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case awaitNanos: |
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startTime = System.nanoTime(); |
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long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis); |
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long nanosRemaining = c.awaitNanos(nanosTimeout); |
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assertTrue(nanosRemaining <= 0); |
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assertTrue(nanosRemaining > -MILLISECONDS.toNanos(LONG_DELAY_MS)); |
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assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
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break; |
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case awaitUntil: |
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// We shouldn't assume that nanoTime and currentTimeMillis |
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// use the same time source, so don't use nanoTime here. |
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java.util.Date delayedDate = delayedDate(timeoutMillis); |
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assertFalse(c.awaitUntil(delayedDate(timeoutMillis))); |
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assertTrue(new java.util.Date().getTime() >= delayedDate.getTime()); |
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break; |
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default: |
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throw new UnsupportedOperationException(); |
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} |
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} catch (InterruptedException ie) { threadUnexpectedException(ie); } |
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assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
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} |
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|
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/** |
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*/ |
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public void testAwaitUninterruptibly() { |
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final Mutex sync = new Mutex(); |
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final ConditionObject c = sync.newCondition(); |
978 |
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final ConditionObject condition = sync.newCondition(); |
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final BooleanLatch pleaseInterrupt = new BooleanLatch(); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
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sync.acquire(); |
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assertTrue(pleaseInterrupt.releaseShared(0)); |
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c.awaitUninterruptibly(); |
984 |
> |
condition.awaitUninterruptibly(); |
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assertTrue(Thread.interrupted()); |
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assertHasWaitersLocked(sync, c, NO_THREADS); |
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assertHasWaitersLocked(sync, condition, NO_THREADS); |
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sync.release(); |
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}}); |
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pleaseInterrupt.acquireShared(0); |
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sync.acquire(); |
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assertHasWaitersLocked(sync, c, t); |
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assertHasWaitersLocked(sync, condition, t); |
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sync.release(); |
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t.interrupt(); |
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assertHasWaitersUnlocked(sync, c, t); |
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assertThreadStaysAlive(t); |
995 |
> |
assertHasWaitersUnlocked(sync, condition, t); |
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> |
assertThreadBlocks(t, Thread.State.WAITING); |
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sync.acquire(); |
998 |
< |
assertHasWaitersLocked(sync, c, t); |
998 |
> |
assertHasWaitersLocked(sync, condition, t); |
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assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
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c.signal(); |
1001 |
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assertHasWaitersLocked(sync, c, NO_THREADS); |
1000 |
> |
condition.signal(); |
1001 |
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assertHasWaitersLocked(sync, condition, NO_THREADS); |
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assertHasExclusiveQueuedThreads(sync, t); |
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sync.release(); |
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awaitTermination(t); |
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waitForQueuedThread(l, t); |
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assertFalse(l.isSignalled()); |
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assertThreadStaysAlive(t); |
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assertThreadBlocks(t, Thread.State.WAITING); |
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assertHasSharedQueuedThreads(l, t); |
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assertTrue(l.releaseShared(0)); |
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assertTrue(l.isSignalled()); |
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waitForQueuedThread(l, t); |
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assertFalse(l.isSignalled()); |
1169 |
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assertThreadStaysAlive(t); |
1169 |
> |
assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
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assertTrue(l.releaseShared(0)); |
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assertTrue(l.isSignalled()); |
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awaitTermination(t); |
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sync.release(); |
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} |
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|
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/** |
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* JDK-8191483: AbstractQueuedSynchronizer cancel/cancel race |
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* ant -Djsr166.tckTestClass=AbstractQueuedSynchronizerTest -Djsr166.methodFilter=testCancelCancelRace -Djsr166.runsPerTest=100 tck |
1266 |
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*/ |
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public void testCancelCancelRace() throws InterruptedException { |
1268 |
+ |
class Sync extends AbstractQueuedSynchronizer { |
1269 |
+ |
protected boolean tryAcquire(int acquires) { |
1270 |
+ |
return !hasQueuedPredecessors() && compareAndSetState(0, 1); |
1271 |
+ |
} |
1272 |
+ |
protected boolean tryRelease(int releases) { |
1273 |
+ |
return compareAndSetState(1, 0); |
1274 |
+ |
} |
1275 |
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} |
1276 |
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|
1277 |
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Sync s = new Sync(); |
1278 |
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s.acquire(1); // acquire to force other threads to enqueue |
1279 |
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|
1280 |
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// try to trigger double cancel race with two background threads |
1281 |
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ArrayList<Thread> threads = new ArrayList<>(); |
1282 |
+ |
Runnable failedAcquire = () -> { |
1283 |
+ |
try { |
1284 |
+ |
s.acquireInterruptibly(1); |
1285 |
+ |
shouldThrow(); |
1286 |
+ |
} catch (InterruptedException expected) {} |
1287 |
+ |
}; |
1288 |
+ |
for (int i = 0; i < 2; i++) { |
1289 |
+ |
Thread thread = new Thread(failedAcquire); |
1290 |
+ |
thread.start(); |
1291 |
+ |
threads.add(thread); |
1292 |
+ |
} |
1293 |
+ |
Thread.sleep(100); |
1294 |
+ |
for (Thread thread : threads) thread.interrupt(); |
1295 |
+ |
for (Thread thread : threads) awaitTermination(thread); |
1296 |
+ |
|
1297 |
+ |
s.release(1); |
1298 |
+ |
|
1299 |
+ |
// no one holds lock now, we should be able to acquire |
1300 |
+ |
if (!s.tryAcquire(1)) |
1301 |
+ |
throw new RuntimeException( |
1302 |
+ |
String.format( |
1303 |
+ |
"Broken: hasQueuedPredecessors=%s hasQueuedThreads=%s queueLength=%d firstQueuedThread=%s", |
1304 |
+ |
s.hasQueuedPredecessors(), |
1305 |
+ |
s.hasQueuedThreads(), |
1306 |
+ |
s.getQueueLength(), |
1307 |
+ |
s.getFirstQueuedThread())); |
1308 |
+ |
} |
1309 |
+ |
|
1310 |
+ |
/** |
1311 |
+ |
* Tests scenario for |
1312 |
+ |
* JDK-8191937: Lost interrupt in AbstractQueuedSynchronizer when tryAcquire methods throw |
1313 |
+ |
*/ |
1314 |
+ |
public void testInterruptedFailingAcquire() throws InterruptedException { |
1315 |
+ |
final RuntimeException ex = new RuntimeException(); |
1316 |
+ |
|
1317 |
+ |
// A synchronizer only offering a choice of failure modes |
1318 |
+ |
class Sync extends AbstractQueuedSynchronizer { |
1319 |
+ |
boolean pleaseThrow; |
1320 |
+ |
@Override protected boolean tryAcquire(int ignored) { |
1321 |
+ |
if (pleaseThrow) throw ex; |
1322 |
+ |
return false; |
1323 |
+ |
} |
1324 |
+ |
@Override protected int tryAcquireShared(int ignored) { |
1325 |
+ |
if (pleaseThrow) throw ex; |
1326 |
+ |
return -1; |
1327 |
+ |
} |
1328 |
+ |
@Override protected boolean tryRelease(int ignored) { |
1329 |
+ |
return true; |
1330 |
+ |
} |
1331 |
+ |
@Override protected boolean tryReleaseShared(int ignored) { |
1332 |
+ |
return true; |
1333 |
+ |
} |
1334 |
+ |
} |
1335 |
+ |
|
1336 |
+ |
final Sync s = new Sync(); |
1337 |
+ |
|
1338 |
+ |
final Thread thread = newStartedThread(new CheckedRunnable() { |
1339 |
+ |
public void realRun() { |
1340 |
+ |
try { |
1341 |
+ |
if (ThreadLocalRandom.current().nextBoolean()) |
1342 |
+ |
s.acquire(1); |
1343 |
+ |
else |
1344 |
+ |
s.acquireShared(1); |
1345 |
+ |
shouldThrow(); |
1346 |
+ |
} catch (Throwable t) { |
1347 |
+ |
assertSame(ex, t); |
1348 |
+ |
assertTrue(Thread.interrupted()); |
1349 |
+ |
} |
1350 |
+ |
}}); |
1351 |
+ |
waitForThreadToEnterWaitState(thread); |
1352 |
+ |
assertSame(thread, s.getFirstQueuedThread()); |
1353 |
+ |
assertTrue(s.hasQueuedPredecessors()); |
1354 |
+ |
assertTrue(s.hasQueuedThreads()); |
1355 |
+ |
assertEquals(1, s.getQueueLength()); |
1356 |
+ |
|
1357 |
+ |
s.pleaseThrow = true; |
1358 |
+ |
thread.interrupt(); |
1359 |
+ |
s.release(1); |
1360 |
+ |
awaitTermination(thread); |
1361 |
+ |
} |
1362 |
+ |
|
1363 |
|
} |