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root/jsr166/jsr166/src/test/tck/StampedLockTest.java
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Comparing jsr166/src/test/tck/StampedLockTest.java (file contents):
Revision 1.31 by jsr166, Sat Feb 18 00:34:52 2017 UTC vs.
Revision 1.38 by jsr166, Thu Sep 21 17:52:52 2017 UTC

# Line 7 | Line 7
7  
8   import static java.util.concurrent.TimeUnit.DAYS;
9   import static java.util.concurrent.TimeUnit.MILLISECONDS;
10 – import static java.util.concurrent.TimeUnit.SECONDS;
10  
11   import java.util.ArrayList;
12   import java.util.List;
# Line 248 | Line 247 | public class StampedLockTest extends JSR
247          long s = assertNonZero(lock.writeLock());
248          assertTrue(lock.validate(s));
249          assertFalse(lock.validate(lock.tryWriteLock()));
250 <        assertFalse(lock.validate(lock.tryWriteLock(0L, SECONDS)));
250 >        assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(),
251 >                                                    randomTimeUnit())));
252          assertFalse(lock.validate(lock.tryReadLock()));
253 <        assertFalse(lock.validate(lock.tryReadLock(0L, SECONDS)));
253 >        assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(),
254 >                                                    randomTimeUnit())));
255          assertFalse(lock.validate(lock.tryOptimisticRead()));
256          lock.unlockWrite(s);
257      }
# Line 476 | Line 477 | public class StampedLockTest extends JSR
477      }
478  
479      /**
480 <     * A writelock succeeds only after a reading thread unlocks
480 >     * writeLock() succeeds only after a reading thread unlocks
481       */
482      public void testWriteAfterReadLock() throws InterruptedException {
483 <        final CountDownLatch threadStarted = new CountDownLatch(1);
483 >        final CountDownLatch aboutToLock = new CountDownLatch(1);
484          final StampedLock lock = new StampedLock();
485          long rs = lock.readLock();
486          Thread t = newStartedThread(new CheckedRunnable() {
487              public void realRun() {
488 <                threadStarted.countDown();
488 >                aboutToLock.countDown();
489                  long s = lock.writeLock();
490 +                assertTrue(lock.isWriteLocked());
491 +                assertFalse(lock.isReadLocked());
492                  lock.unlockWrite(s);
493              }});
494  
495 <        threadStarted.await();
496 <        waitForThreadToEnterWaitState(t, MEDIUM_DELAY_MS);
495 >        await(aboutToLock);
496 >        assertThreadBlocks(t, Thread.State.WAITING);
497          assertFalse(lock.isWriteLocked());
498 +        assertTrue(lock.isReadLocked());
499          lock.unlockRead(rs);
500          awaitTermination(t);
501 <        assertFalse(lock.isWriteLocked());
501 >        assertUnlocked(lock);
502      }
503  
504      /**
505 <     * A writelock succeeds only after reading threads unlock
505 >     * writeLock() succeeds only after reading threads unlock
506       */
507      public void testWriteAfterMultipleReadLocks() {
508          final StampedLock lock = new StampedLock();
# Line 521 | Line 525 | public class StampedLockTest extends JSR
525          assertFalse(lock.isWriteLocked());
526          lock.unlockRead(s);
527          awaitTermination(t2);
528 <        assertFalse(lock.isWriteLocked());
528 >        assertUnlocked(lock);
529      }
530  
531      /**
532 <     * Readlocks succeed only after a writing thread unlocks
532 >     * readLock() succeed only after a writing thread unlocks
533       */
534      public void testReadAfterWriteLock() {
535          final StampedLock lock = new StampedLock();
536          final CountDownLatch threadsStarted = new CountDownLatch(2);
537          final long s = lock.writeLock();
538 <        Thread t1 = newStartedThread(new CheckedRunnable() {
535 <            public void realRun() {
536 <                threadsStarted.countDown();
537 <                long rs = lock.readLock();
538 <                lock.unlockRead(rs);
539 <            }});
540 <        Thread t2 = newStartedThread(new CheckedRunnable() {
538 >        final Runnable acquireReleaseReadLock = new CheckedRunnable() {
539              public void realRun() {
540                  threadsStarted.countDown();
541                  long rs = lock.readLock();
542 +                assertTrue(lock.isReadLocked());
543 +                assertFalse(lock.isWriteLocked());
544                  lock.unlockRead(rs);
545 <            }});
545 >            }};
546 >        Thread t1 = newStartedThread(acquireReleaseReadLock);
547 >        Thread t2 = newStartedThread(acquireReleaseReadLock);
548  
549          await(threadsStarted);
550 <        waitForThreadToEnterWaitState(t1, MEDIUM_DELAY_MS);
551 <        waitForThreadToEnterWaitState(t2, MEDIUM_DELAY_MS);
550 >        assertThreadBlocks(t1, Thread.State.WAITING);
551 >        assertThreadBlocks(t2, Thread.State.WAITING);
552 >        assertTrue(lock.isWriteLocked());
553 >        assertFalse(lock.isReadLocked());
554          releaseWriteLock(lock, s);
555          awaitTermination(t1);
556          awaitTermination(t2);
557 +        assertUnlocked(lock);
558      }
559  
560      /**
# Line 735 | Line 740 | public class StampedLockTest extends JSR
740       */
741      public void testValidateOptimisticWriteLocked2()
742              throws InterruptedException {
743 <        final CountDownLatch running = new CountDownLatch(1);
743 >        final CountDownLatch locked = new CountDownLatch(1);
744          final StampedLock lock = new StampedLock();
745          final long p = assertValid(lock, lock.tryOptimisticRead());
746  
747          Thread t = newStartedThread(new CheckedInterruptedRunnable() {
748              public void realRun() throws InterruptedException {
749                  lock.writeLockInterruptibly();
750 <                running.countDown();
750 >                locked.countDown();
751                  lock.writeLockInterruptibly();
752              }});
753  
754 <        running.await();
754 >        await(locked);
755          assertFalse(lock.validate(p));
756          assertEquals(0L, lock.tryOptimisticRead());
757 +        assertThreadBlocks(t, Thread.State.WAITING);
758          t.interrupt();
759          awaitTermination(t);
760 +        assertTrue(lock.isWriteLocked());
761      }
762  
763      /**
# Line 1173 | Line 1180 | public class StampedLockTest extends JSR
1180          }
1181          assertUnlocked(lock);
1182      }
1183 +
1184 +    /**
1185 +     * Stamped locks are not reentrant.
1186 +     */
1187 +    public void testNonReentrant() throws InterruptedException {
1188 +        final StampedLock lock = new StampedLock();
1189 +        long stamp;
1190 +
1191 +        stamp = lock.writeLock();
1192 +        assertValid(lock, stamp);
1193 +        assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1194 +        assertEquals(0L, lock.tryReadLock(0L, DAYS));
1195 +        assertValid(lock, stamp);
1196 +        lock.unlockWrite(stamp);
1197 +
1198 +        stamp = lock.tryWriteLock(1L, DAYS);
1199 +        assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1200 +        assertValid(lock, stamp);
1201 +        lock.unlockWrite(stamp);
1202 +
1203 +        stamp = lock.readLock();
1204 +        assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1205 +        assertValid(lock, stamp);
1206 +        lock.unlockRead(stamp);
1207 +    }
1208 +
1209 +    /**
1210 +     * """StampedLocks have no notion of ownership. Locks acquired in
1211 +     * one thread can be released or converted in another."""
1212 +     */
1213 +    public void testNoOwnership() throws Throwable {
1214 +        ArrayList<Future<?>> futures = new ArrayList<>();
1215 +        for (Function<StampedLock, Long> writeLocker : writeLockers())
1216 +        for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
1217 +            StampedLock lock = new StampedLock();
1218 +            long stamp = writeLocker.apply(lock);
1219 +            futures.add(cachedThreadPool.submit(new CheckedRunnable() {
1220 +                public void realRun() {
1221 +                    writeUnlocker.accept(lock, stamp);
1222 +                    assertUnlocked(lock);
1223 +                    assertFalse(lock.validate(stamp));
1224 +                }}));
1225 +        }
1226 +        for (Future<?> future : futures)
1227 +            assertNull(future.get());
1228 +    }
1229   }

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