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/* |
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* Written by Doug Lea and Martin Buchholz |
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* with assistance from members of JCP JSR-166 Expert Group and |
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* released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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import static java.util.concurrent.TimeUnit.DAYS; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import static java.util.concurrent.TimeUnit.SECONDS; |
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|
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.TimeUnit; |
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import java.util.concurrent.locks.Lock; |
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import java.util.concurrent.locks.StampedLock; |
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import java.util.function.BiConsumer; |
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import java.util.function.Function; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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|
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public class StampedLockTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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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(StampedLockTest.class); |
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} |
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|
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/** |
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* Releases write lock, checking isWriteLocked before and after |
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*/ |
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void releaseWriteLock(StampedLock lock, long stamp) { |
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assertTrue(lock.isWriteLocked()); |
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assertValid(lock, stamp); |
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lock.unlockWrite(stamp); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.validate(stamp)); |
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} |
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|
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/** |
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* Releases read lock, checking isReadLocked before and after |
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*/ |
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void releaseReadLock(StampedLock lock, long stamp) { |
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assertTrue(lock.isReadLocked()); |
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assertValid(lock, stamp); |
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lock.unlockRead(stamp); |
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assertFalse(lock.isReadLocked()); |
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assertTrue(lock.validate(stamp)); |
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} |
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|
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long assertNonZero(long v) { |
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assertTrue(v != 0L); |
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return v; |
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} |
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|
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long assertValid(StampedLock lock, long stamp) { |
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assertTrue(stamp != 0L); |
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assertTrue(lock.validate(stamp)); |
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return stamp; |
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} |
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|
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void assertUnlocked(StampedLock lock) { |
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assertFalse(lock.isReadLocked()); |
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assertFalse(lock.isWriteLocked()); |
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assertEquals(0, lock.getReadLockCount()); |
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assertValid(lock, lock.tryOptimisticRead()); |
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} |
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|
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List<Action> lockLockers(Lock lock) { |
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List<Action> lockers = new ArrayList<>(); |
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lockers.add(() -> lock.lock()); |
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lockers.add(() -> lock.lockInterruptibly()); |
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lockers.add(() -> lock.tryLock()); |
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lockers.add(() -> lock.tryLock(Long.MIN_VALUE, DAYS)); |
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lockers.add(() -> lock.tryLock(0L, DAYS)); |
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lockers.add(() -> lock.tryLock(Long.MAX_VALUE, DAYS)); |
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return lockers; |
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} |
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|
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List<Function<StampedLock, Long>> readLockers() { |
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List<Function<StampedLock, Long>> readLockers = new ArrayList<>(); |
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readLockers.add(sl -> sl.readLock()); |
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readLockers.add(sl -> sl.tryReadLock()); |
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readLockers.add(sl -> readLockInterruptiblyUninterrupted(sl)); |
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readLockers.add(sl -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS)); |
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readLockers.add(sl -> tryReadLockUninterrupted(sl, 0L, DAYS)); |
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readLockers.add(sl -> sl.tryConvertToReadLock(sl.tryOptimisticRead())); |
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return readLockers; |
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} |
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|
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List<BiConsumer<StampedLock, Long>> readUnlockers() { |
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List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>(); |
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readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp)); |
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readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead())); |
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readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock()); |
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readUnlockers.add((sl, stamp) -> sl.unlock(stamp)); |
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readUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
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return readUnlockers; |
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} |
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|
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List<Function<StampedLock, Long>> writeLockers() { |
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List<Function<StampedLock, Long>> writeLockers = new ArrayList<>(); |
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writeLockers.add(sl -> sl.writeLock()); |
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writeLockers.add(sl -> sl.tryWriteLock()); |
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writeLockers.add(sl -> writeLockInterruptiblyUninterrupted(sl)); |
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writeLockers.add(sl -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS)); |
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writeLockers.add(sl -> tryWriteLockUninterrupted(sl, 0L, DAYS)); |
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writeLockers.add(sl -> sl.tryConvertToWriteLock(sl.tryOptimisticRead())); |
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return writeLockers; |
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} |
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|
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List<BiConsumer<StampedLock, Long>> writeUnlockers() { |
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List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>(); |
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writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp)); |
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writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite())); |
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writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock()); |
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writeUnlockers.add((sl, stamp) -> sl.unlock(stamp)); |
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writeUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
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return writeUnlockers; |
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} |
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|
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/** |
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* Constructed StampedLock is in unlocked state |
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*/ |
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public void testConstructor() { |
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assertUnlocked(new StampedLock()); |
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} |
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|
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/** |
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* write-locking, then unlocking, an unlocked lock succeed |
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*/ |
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public void testWriteLock_lockUnlock() { |
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StampedLock lock = new StampedLock(); |
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|
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for (Function<StampedLock, Long> writeLocker : writeLockers()) |
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for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(0, lock.getReadLockCount()); |
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|
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long s = writeLocker.apply(lock); |
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assertValid(lock, s); |
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assertTrue(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(0, lock.getReadLockCount()); |
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writeUnlocker.accept(lock, s); |
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assertUnlocked(lock); |
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} |
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} |
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|
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/** |
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* read-locking, then unlocking, an unlocked lock succeed |
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*/ |
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public void testReadLock_lockUnlock() { |
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StampedLock lock = new StampedLock(); |
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|
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for (Function<StampedLock, Long> readLocker : readLockers()) |
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for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
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long s = 42; |
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for (int i = 0; i < 2; i++) { |
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s = assertValid(lock, readLocker.apply(lock)); |
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assertFalse(lock.isWriteLocked()); |
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assertTrue(lock.isReadLocked()); |
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assertEquals(i + 1, lock.getReadLockCount()); |
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} |
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for (int i = 0; i < 2; i++) { |
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assertFalse(lock.isWriteLocked()); |
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assertTrue(lock.isReadLocked()); |
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assertEquals(2 - i, lock.getReadLockCount()); |
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readUnlocker.accept(lock, s); |
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} |
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assertUnlocked(lock); |
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} |
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} |
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|
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/** |
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* tryUnlockWrite fails if not write locked |
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*/ |
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public void testTryUnlockWrite_failure() { |
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StampedLock lock = new StampedLock(); |
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assertFalse(lock.tryUnlockWrite()); |
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|
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for (Function<StampedLock, Long> readLocker : readLockers()) |
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for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
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long s = assertValid(lock, readLocker.apply(lock)); |
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assertFalse(lock.tryUnlockWrite()); |
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assertTrue(lock.isReadLocked()); |
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readUnlocker.accept(lock, s); |
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assertUnlocked(lock); |
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} |
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} |
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|
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/** |
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* tryUnlockRead fails if not read locked |
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*/ |
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public void testTryUnlockRead_failure() { |
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StampedLock lock = new StampedLock(); |
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assertFalse(lock.tryUnlockRead()); |
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|
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for (Function<StampedLock, Long> writeLocker : writeLockers()) |
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for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
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long s = writeLocker.apply(lock); |
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assertFalse(lock.tryUnlockRead()); |
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assertTrue(lock.isWriteLocked()); |
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writeUnlocker.accept(lock, s); |
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assertUnlocked(lock); |
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} |
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} |
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|
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/** |
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* validate(0L) fails |
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*/ |
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public void testValidate0() { |
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StampedLock lock = new StampedLock(); |
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assertFalse(lock.validate(0L)); |
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} |
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|
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/** |
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* A stamp obtained from a successful lock operation validates while the lock is held |
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*/ |
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public void testValidate() throws InterruptedException { |
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StampedLock lock = new StampedLock(); |
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|
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for (Function<StampedLock, Long> readLocker : readLockers()) |
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for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
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long s = assertNonZero(readLocker.apply(lock)); |
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assertTrue(lock.validate(s)); |
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readUnlocker.accept(lock, s); |
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} |
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|
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for (Function<StampedLock, Long> writeLocker : writeLockers()) |
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for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
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long s = assertNonZero(writeLocker.apply(lock)); |
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assertTrue(lock.validate(s)); |
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writeUnlocker.accept(lock, s); |
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} |
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} |
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|
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/** |
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* A stamp obtained from an unsuccessful lock operation does not validate |
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*/ |
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public void testValidate2() throws InterruptedException { |
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StampedLock lock = new StampedLock(); |
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long s = assertNonZero(lock.writeLock()); |
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assertTrue(lock.validate(s)); |
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assertFalse(lock.validate(lock.tryWriteLock())); |
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assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(), |
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randomTimeUnit()))); |
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assertFalse(lock.validate(lock.tryReadLock())); |
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assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(), |
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randomTimeUnit()))); |
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assertFalse(lock.validate(lock.tryOptimisticRead())); |
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lock.unlockWrite(s); |
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} |
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|
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void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) { |
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for (Action action : actions) { |
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Thread.currentThread().interrupt(); |
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try { |
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action.run(); |
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shouldThrow(); |
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} |
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catch (InterruptedException success) {} |
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catch (Throwable fail) { threadUnexpectedException(fail); } |
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assertFalse(Thread.interrupted()); |
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} |
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} |
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|
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/** |
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* interruptible operations throw InterruptedException when pre-interrupted |
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*/ |
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public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() { |
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final StampedLock lock = new StampedLock(); |
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|
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Action[] interruptibleLockActions = { |
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() -> lock.writeLockInterruptibly(), |
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() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS), |
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() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
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() -> lock.readLockInterruptibly(), |
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() -> lock.tryReadLock(Long.MIN_VALUE, DAYS), |
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() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
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() -> lock.asWriteLock().lockInterruptibly(), |
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() -> lock.asWriteLock().tryLock(0L, DAYS), |
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() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
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() -> lock.asReadLock().lockInterruptibly(), |
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() -> lock.asReadLock().tryLock(0L, DAYS), |
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() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
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}; |
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shuffle(interruptibleLockActions); |
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|
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assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
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{ |
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long s = lock.writeLock(); |
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assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
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lock.unlockWrite(s); |
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} |
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{ |
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long s = lock.readLock(); |
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assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
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lock.unlockRead(s); |
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} |
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} |
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|
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void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) { |
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int n = actions.length; |
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Future<?>[] futures = new Future<?>[n]; |
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CountDownLatch threadsStarted = new CountDownLatch(n); |
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CountDownLatch done = new CountDownLatch(n); |
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|
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for (int i = 0; i < n; i++) { |
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Action action = actions[i]; |
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futures[i] = cachedThreadPool.submit(new CheckedRunnable() { |
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public void realRun() throws Throwable { |
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threadsStarted.countDown(); |
319 |
try { |
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action.run(); |
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shouldThrow(); |
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} |
323 |
catch (InterruptedException success) {} |
324 |
catch (Throwable fail) { threadUnexpectedException(fail); } |
325 |
assertFalse(Thread.interrupted()); |
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done.countDown(); |
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}}); |
328 |
} |
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|
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await(threadsStarted); |
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assertEquals(n, done.getCount()); |
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for (Future<?> future : futures) // Interrupt all the tasks |
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future.cancel(true); |
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await(done); |
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} |
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|
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/** |
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* interruptible operations throw InterruptedException when write locked and interrupted |
339 |
*/ |
340 |
public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() { |
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final StampedLock lock = new StampedLock(); |
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long s = lock.writeLock(); |
343 |
|
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Action[] interruptibleLockBlockingActions = { |
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() -> lock.writeLockInterruptibly(), |
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() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
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() -> lock.readLockInterruptibly(), |
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() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
349 |
() -> lock.asWriteLock().lockInterruptibly(), |
350 |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
351 |
() -> lock.asReadLock().lockInterruptibly(), |
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() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
353 |
}; |
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shuffle(interruptibleLockBlockingActions); |
355 |
|
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assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
357 |
} |
358 |
|
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/** |
360 |
* interruptible operations throw InterruptedException when read locked and interrupted |
361 |
*/ |
362 |
public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() { |
363 |
final StampedLock lock = new StampedLock(); |
364 |
long s = lock.readLock(); |
365 |
|
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Action[] interruptibleLockBlockingActions = { |
367 |
() -> lock.writeLockInterruptibly(), |
368 |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
369 |
() -> lock.asWriteLock().lockInterruptibly(), |
370 |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
371 |
}; |
372 |
shuffle(interruptibleLockBlockingActions); |
373 |
|
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assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
375 |
} |
376 |
|
377 |
/** |
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* Non-interruptible operations ignore and preserve interrupt status |
379 |
*/ |
380 |
public void testNonInterruptibleOperationsIgnoreInterrupts() { |
381 |
final StampedLock lock = new StampedLock(); |
382 |
Thread.currentThread().interrupt(); |
383 |
|
384 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
385 |
long s = assertValid(lock, lock.readLock()); |
386 |
readUnlocker.accept(lock, s); |
387 |
s = assertValid(lock, lock.tryReadLock()); |
388 |
readUnlocker.accept(lock, s); |
389 |
} |
390 |
|
391 |
lock.asReadLock().lock(); |
392 |
lock.asReadLock().unlock(); |
393 |
|
394 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
395 |
long s = assertValid(lock, lock.writeLock()); |
396 |
writeUnlocker.accept(lock, s); |
397 |
s = assertValid(lock, lock.tryWriteLock()); |
398 |
writeUnlocker.accept(lock, s); |
399 |
} |
400 |
|
401 |
lock.asWriteLock().lock(); |
402 |
lock.asWriteLock().unlock(); |
403 |
|
404 |
assertTrue(Thread.interrupted()); |
405 |
} |
406 |
|
407 |
/** |
408 |
* tryWriteLock on an unlocked lock succeeds |
409 |
*/ |
410 |
public void testTryWriteLock() { |
411 |
final StampedLock lock = new StampedLock(); |
412 |
long s = lock.tryWriteLock(); |
413 |
assertTrue(s != 0L); |
414 |
assertTrue(lock.isWriteLocked()); |
415 |
assertEquals(0L, lock.tryWriteLock()); |
416 |
releaseWriteLock(lock, s); |
417 |
} |
418 |
|
419 |
/** |
420 |
* tryWriteLock fails if locked |
421 |
*/ |
422 |
public void testTryWriteLockWhenLocked() { |
423 |
final StampedLock lock = new StampedLock(); |
424 |
long s = lock.writeLock(); |
425 |
Thread t = newStartedThread(new CheckedRunnable() { |
426 |
public void realRun() { |
427 |
assertEquals(0L, lock.tryWriteLock()); |
428 |
}}); |
429 |
|
430 |
assertEquals(0L, lock.tryWriteLock()); |
431 |
awaitTermination(t); |
432 |
releaseWriteLock(lock, s); |
433 |
} |
434 |
|
435 |
/** |
436 |
* tryReadLock fails if write-locked |
437 |
*/ |
438 |
public void testTryReadLockWhenLocked() { |
439 |
final StampedLock lock = new StampedLock(); |
440 |
long s = lock.writeLock(); |
441 |
Thread t = newStartedThread(new CheckedRunnable() { |
442 |
public void realRun() { |
443 |
assertEquals(0L, lock.tryReadLock()); |
444 |
}}); |
445 |
|
446 |
assertEquals(0L, lock.tryReadLock()); |
447 |
awaitTermination(t); |
448 |
releaseWriteLock(lock, s); |
449 |
} |
450 |
|
451 |
/** |
452 |
* Multiple threads can hold a read lock when not write-locked |
453 |
*/ |
454 |
public void testMultipleReadLocks() { |
455 |
final StampedLock lock = new StampedLock(); |
456 |
final long s = lock.readLock(); |
457 |
Thread t = newStartedThread(new CheckedRunnable() { |
458 |
public void realRun() throws InterruptedException { |
459 |
long s2 = lock.tryReadLock(); |
460 |
assertValid(lock, s2); |
461 |
lock.unlockRead(s2); |
462 |
long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS); |
463 |
assertValid(lock, s3); |
464 |
lock.unlockRead(s3); |
465 |
long s4 = lock.readLock(); |
466 |
assertValid(lock, s4); |
467 |
lock.unlockRead(s4); |
468 |
lock.asReadLock().lock(); |
469 |
lock.asReadLock().unlock(); |
470 |
lock.asReadLock().lockInterruptibly(); |
471 |
lock.asReadLock().unlock(); |
472 |
lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS); |
473 |
lock.asReadLock().unlock(); |
474 |
}}); |
475 |
|
476 |
awaitTermination(t); |
477 |
lock.unlockRead(s); |
478 |
} |
479 |
|
480 |
/** |
481 |
* writeLock() succeeds only after a reading thread unlocks |
482 |
*/ |
483 |
public void testWriteAfterReadLock() throws InterruptedException { |
484 |
final CountDownLatch aboutToLock = new CountDownLatch(1); |
485 |
final StampedLock lock = new StampedLock(); |
486 |
long rs = lock.readLock(); |
487 |
Thread t = newStartedThread(new CheckedRunnable() { |
488 |
public void realRun() { |
489 |
aboutToLock.countDown(); |
490 |
long s = lock.writeLock(); |
491 |
assertTrue(lock.isWriteLocked()); |
492 |
assertFalse(lock.isReadLocked()); |
493 |
lock.unlockWrite(s); |
494 |
}}); |
495 |
|
496 |
await(aboutToLock); |
497 |
assertThreadBlocks(t, Thread.State.WAITING); |
498 |
assertFalse(lock.isWriteLocked()); |
499 |
assertTrue(lock.isReadLocked()); |
500 |
lock.unlockRead(rs); |
501 |
awaitTermination(t); |
502 |
assertUnlocked(lock); |
503 |
} |
504 |
|
505 |
/** |
506 |
* writeLock() succeeds only after reading threads unlock |
507 |
*/ |
508 |
public void testWriteAfterMultipleReadLocks() { |
509 |
final StampedLock lock = new StampedLock(); |
510 |
long s = lock.readLock(); |
511 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
512 |
public void realRun() { |
513 |
long rs = lock.readLock(); |
514 |
lock.unlockRead(rs); |
515 |
}}); |
516 |
|
517 |
awaitTermination(t1); |
518 |
|
519 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
520 |
public void realRun() { |
521 |
long ws = lock.writeLock(); |
522 |
lock.unlockWrite(ws); |
523 |
}}); |
524 |
|
525 |
assertTrue(lock.isReadLocked()); |
526 |
assertFalse(lock.isWriteLocked()); |
527 |
lock.unlockRead(s); |
528 |
awaitTermination(t2); |
529 |
assertUnlocked(lock); |
530 |
} |
531 |
|
532 |
/** |
533 |
* readLock() succeed only after a writing thread unlocks |
534 |
*/ |
535 |
public void testReadAfterWriteLock() { |
536 |
final StampedLock lock = new StampedLock(); |
537 |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
538 |
final long s = lock.writeLock(); |
539 |
final Runnable acquireReleaseReadLock = new CheckedRunnable() { |
540 |
public void realRun() { |
541 |
threadsStarted.countDown(); |
542 |
long rs = lock.readLock(); |
543 |
assertTrue(lock.isReadLocked()); |
544 |
assertFalse(lock.isWriteLocked()); |
545 |
lock.unlockRead(rs); |
546 |
}}; |
547 |
Thread t1 = newStartedThread(acquireReleaseReadLock); |
548 |
Thread t2 = newStartedThread(acquireReleaseReadLock); |
549 |
|
550 |
await(threadsStarted); |
551 |
assertThreadBlocks(t1, Thread.State.WAITING); |
552 |
assertThreadBlocks(t2, Thread.State.WAITING); |
553 |
assertTrue(lock.isWriteLocked()); |
554 |
assertFalse(lock.isReadLocked()); |
555 |
releaseWriteLock(lock, s); |
556 |
awaitTermination(t1); |
557 |
awaitTermination(t2); |
558 |
assertUnlocked(lock); |
559 |
} |
560 |
|
561 |
/** |
562 |
* tryReadLock succeeds if read locked but not write locked |
563 |
*/ |
564 |
public void testTryLockWhenReadLocked() { |
565 |
final StampedLock lock = new StampedLock(); |
566 |
long s = lock.readLock(); |
567 |
Thread t = newStartedThread(new CheckedRunnable() { |
568 |
public void realRun() { |
569 |
long rs = lock.tryReadLock(); |
570 |
assertValid(lock, rs); |
571 |
lock.unlockRead(rs); |
572 |
}}); |
573 |
|
574 |
awaitTermination(t); |
575 |
lock.unlockRead(s); |
576 |
} |
577 |
|
578 |
/** |
579 |
* tryWriteLock fails when read locked |
580 |
*/ |
581 |
public void testTryWriteLockWhenReadLocked() { |
582 |
final StampedLock lock = new StampedLock(); |
583 |
long s = lock.readLock(); |
584 |
Thread t = newStartedThread(new CheckedRunnable() { |
585 |
public void realRun() { |
586 |
threadAssertEquals(0L, lock.tryWriteLock()); |
587 |
}}); |
588 |
|
589 |
awaitTermination(t); |
590 |
lock.unlockRead(s); |
591 |
} |
592 |
|
593 |
/** |
594 |
* timed lock operations time out if lock not available |
595 |
*/ |
596 |
public void testTimedLock_Timeout() throws Exception { |
597 |
ArrayList<Future<?>> futures = new ArrayList<>(); |
598 |
|
599 |
// Write locked |
600 |
final StampedLock lock = new StampedLock(); |
601 |
long stamp = lock.writeLock(); |
602 |
assertEquals(0L, lock.tryReadLock(0L, DAYS)); |
603 |
assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS)); |
604 |
assertFalse(lock.asReadLock().tryLock(0L, DAYS)); |
605 |
assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS)); |
606 |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
607 |
assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS)); |
608 |
assertFalse(lock.asWriteLock().tryLock(0L, DAYS)); |
609 |
assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
610 |
|
611 |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
612 |
public void realRun() throws InterruptedException { |
613 |
long startTime = System.nanoTime(); |
614 |
assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
615 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
616 |
}})); |
617 |
|
618 |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
619 |
public void realRun() throws InterruptedException { |
620 |
long startTime = System.nanoTime(); |
621 |
assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS)); |
622 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
623 |
}})); |
624 |
|
625 |
// Read locked |
626 |
final StampedLock lock2 = new StampedLock(); |
627 |
long stamp2 = lock2.readLock(); |
628 |
assertEquals(0L, lock2.tryWriteLock(0L, DAYS)); |
629 |
assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS)); |
630 |
assertFalse(lock2.asWriteLock().tryLock(0L, DAYS)); |
631 |
assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
632 |
|
633 |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
634 |
public void realRun() throws InterruptedException { |
635 |
long startTime = System.nanoTime(); |
636 |
assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
637 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
638 |
}})); |
639 |
|
640 |
for (Future<?> future : futures) |
641 |
assertNull(future.get()); |
642 |
|
643 |
releaseWriteLock(lock, stamp); |
644 |
releaseReadLock(lock2, stamp2); |
645 |
} |
646 |
|
647 |
/** |
648 |
* writeLockInterruptibly succeeds if unlocked |
649 |
*/ |
650 |
public void testWriteLockInterruptibly() throws InterruptedException { |
651 |
final StampedLock lock = new StampedLock(); |
652 |
long s = lock.writeLockInterruptibly(); |
653 |
assertTrue(lock.isWriteLocked()); |
654 |
releaseWriteLock(lock, s); |
655 |
} |
656 |
|
657 |
/** |
658 |
* readLockInterruptibly succeeds if lock free |
659 |
*/ |
660 |
public void testReadLockInterruptibly() throws InterruptedException { |
661 |
final StampedLock lock = new StampedLock(); |
662 |
|
663 |
long s = assertValid(lock, lock.readLockInterruptibly()); |
664 |
assertTrue(lock.isReadLocked()); |
665 |
lock.unlockRead(s); |
666 |
|
667 |
lock.asReadLock().lockInterruptibly(); |
668 |
assertTrue(lock.isReadLocked()); |
669 |
lock.asReadLock().unlock(); |
670 |
} |
671 |
|
672 |
/** |
673 |
* A serialized lock deserializes as unlocked |
674 |
*/ |
675 |
public void testSerialization() { |
676 |
StampedLock lock = new StampedLock(); |
677 |
lock.writeLock(); |
678 |
StampedLock clone = serialClone(lock); |
679 |
assertTrue(lock.isWriteLocked()); |
680 |
assertFalse(clone.isWriteLocked()); |
681 |
long s = clone.writeLock(); |
682 |
assertTrue(clone.isWriteLocked()); |
683 |
clone.unlockWrite(s); |
684 |
assertFalse(clone.isWriteLocked()); |
685 |
} |
686 |
|
687 |
/** |
688 |
* toString indicates current lock state |
689 |
*/ |
690 |
public void testToString() { |
691 |
StampedLock lock = new StampedLock(); |
692 |
assertTrue(lock.toString().contains("Unlocked")); |
693 |
long s = lock.writeLock(); |
694 |
assertTrue(lock.toString().contains("Write-locked")); |
695 |
lock.unlockWrite(s); |
696 |
s = lock.readLock(); |
697 |
assertTrue(lock.toString().contains("Read-locks")); |
698 |
} |
699 |
|
700 |
/** |
701 |
* tryOptimisticRead succeeds and validates if unlocked, fails if |
702 |
* exclusively locked |
703 |
*/ |
704 |
public void testValidateOptimistic() throws InterruptedException { |
705 |
StampedLock lock = new StampedLock(); |
706 |
|
707 |
assertValid(lock, lock.tryOptimisticRead()); |
708 |
|
709 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
710 |
long s = assertValid(lock, writeLocker.apply(lock)); |
711 |
assertEquals(0L, lock.tryOptimisticRead()); |
712 |
releaseWriteLock(lock, s); |
713 |
} |
714 |
|
715 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
716 |
long s = assertValid(lock, readLocker.apply(lock)); |
717 |
long p = assertValid(lock, lock.tryOptimisticRead()); |
718 |
releaseReadLock(lock, s); |
719 |
assertTrue(lock.validate(p)); |
720 |
} |
721 |
|
722 |
assertValid(lock, lock.tryOptimisticRead()); |
723 |
} |
724 |
|
725 |
/** |
726 |
* tryOptimisticRead stamp does not validate if a write lock intervenes |
727 |
*/ |
728 |
public void testValidateOptimisticWriteLocked() { |
729 |
final StampedLock lock = new StampedLock(); |
730 |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
731 |
final long s = assertValid(lock, lock.writeLock()); |
732 |
assertFalse(lock.validate(p)); |
733 |
assertEquals(0L, lock.tryOptimisticRead()); |
734 |
assertTrue(lock.validate(s)); |
735 |
lock.unlockWrite(s); |
736 |
} |
737 |
|
738 |
/** |
739 |
* tryOptimisticRead stamp does not validate if a write lock |
740 |
* intervenes in another thread |
741 |
*/ |
742 |
public void testValidateOptimisticWriteLocked2() |
743 |
throws InterruptedException { |
744 |
final CountDownLatch locked = new CountDownLatch(1); |
745 |
final StampedLock lock = new StampedLock(); |
746 |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
747 |
|
748 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
749 |
public void realRun() throws InterruptedException { |
750 |
lock.writeLockInterruptibly(); |
751 |
locked.countDown(); |
752 |
lock.writeLockInterruptibly(); |
753 |
}}); |
754 |
|
755 |
await(locked); |
756 |
assertFalse(lock.validate(p)); |
757 |
assertEquals(0L, lock.tryOptimisticRead()); |
758 |
assertThreadBlocks(t, Thread.State.WAITING); |
759 |
t.interrupt(); |
760 |
awaitTermination(t); |
761 |
assertTrue(lock.isWriteLocked()); |
762 |
} |
763 |
|
764 |
/** |
765 |
* tryConvertToOptimisticRead succeeds and validates if successfully locked |
766 |
*/ |
767 |
public void testTryConvertToOptimisticRead() throws InterruptedException { |
768 |
StampedLock lock = new StampedLock(); |
769 |
long s, p, q; |
770 |
assertEquals(0L, lock.tryConvertToOptimisticRead(0L)); |
771 |
|
772 |
s = assertValid(lock, lock.tryOptimisticRead()); |
773 |
assertEquals(s, lock.tryConvertToOptimisticRead(s)); |
774 |
assertTrue(lock.validate(s)); |
775 |
|
776 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
777 |
s = assertValid(lock, writeLocker.apply(lock)); |
778 |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
779 |
assertFalse(lock.validate(s)); |
780 |
assertTrue(lock.validate(p)); |
781 |
assertUnlocked(lock); |
782 |
} |
783 |
|
784 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
785 |
s = assertValid(lock, readLocker.apply(lock)); |
786 |
q = assertValid(lock, lock.tryOptimisticRead()); |
787 |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
788 |
assertTrue(lock.validate(q)); |
789 |
assertTrue(lock.isReadLocked()); |
790 |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
791 |
assertTrue(lock.validate(p)); |
792 |
assertTrue(lock.validate(s)); |
793 |
assertUnlocked(lock); |
794 |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
795 |
assertTrue(lock.validate(q)); |
796 |
} |
797 |
} |
798 |
|
799 |
/** |
800 |
* tryConvertToReadLock succeeds for valid stamps |
801 |
*/ |
802 |
public void testTryConvertToReadLock() throws InterruptedException { |
803 |
StampedLock lock = new StampedLock(); |
804 |
long s, p; |
805 |
|
806 |
assertEquals(0L, lock.tryConvertToReadLock(0L)); |
807 |
|
808 |
s = assertValid(lock, lock.tryOptimisticRead()); |
809 |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
810 |
assertTrue(lock.isReadLocked()); |
811 |
assertEquals(1, lock.getReadLockCount()); |
812 |
assertTrue(lock.validate(s)); |
813 |
lock.unlockRead(p); |
814 |
|
815 |
s = assertValid(lock, lock.tryOptimisticRead()); |
816 |
lock.readLock(); |
817 |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
818 |
assertTrue(lock.isReadLocked()); |
819 |
assertEquals(2, lock.getReadLockCount()); |
820 |
lock.unlockRead(p); |
821 |
lock.unlockRead(p); |
822 |
assertUnlocked(lock); |
823 |
|
824 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
825 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
826 |
s = assertValid(lock, writeLocker.apply(lock)); |
827 |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
828 |
assertFalse(lock.validate(s)); |
829 |
assertTrue(lock.isReadLocked()); |
830 |
assertEquals(1, lock.getReadLockCount()); |
831 |
readUnlocker.accept(lock, p); |
832 |
} |
833 |
|
834 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
835 |
s = assertValid(lock, readLocker.apply(lock)); |
836 |
assertEquals(s, lock.tryConvertToReadLock(s)); |
837 |
assertTrue(lock.validate(s)); |
838 |
assertTrue(lock.isReadLocked()); |
839 |
assertEquals(1, lock.getReadLockCount()); |
840 |
readUnlocker.accept(lock, s); |
841 |
} |
842 |
} |
843 |
} |
844 |
|
845 |
/** |
846 |
* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked |
847 |
*/ |
848 |
public void testTryConvertToWriteLock() throws InterruptedException { |
849 |
StampedLock lock = new StampedLock(); |
850 |
long s, p; |
851 |
|
852 |
assertEquals(0L, lock.tryConvertToWriteLock(0L)); |
853 |
|
854 |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
855 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
856 |
assertTrue(lock.isWriteLocked()); |
857 |
lock.unlockWrite(p); |
858 |
|
859 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
860 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
861 |
s = assertValid(lock, writeLocker.apply(lock)); |
862 |
assertEquals(s, lock.tryConvertToWriteLock(s)); |
863 |
assertTrue(lock.validate(s)); |
864 |
assertTrue(lock.isWriteLocked()); |
865 |
writeUnlocker.accept(lock, s); |
866 |
} |
867 |
|
868 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
869 |
s = assertValid(lock, readLocker.apply(lock)); |
870 |
p = assertValid(lock, lock.tryConvertToWriteLock(s)); |
871 |
assertFalse(lock.validate(s)); |
872 |
assertTrue(lock.validate(p)); |
873 |
assertTrue(lock.isWriteLocked()); |
874 |
writeUnlocker.accept(lock, p); |
875 |
} |
876 |
} |
877 |
|
878 |
// failure if multiply read locked |
879 |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
880 |
s = assertValid(lock, readLocker.apply(lock)); |
881 |
p = assertValid(lock, readLocker.apply(lock)); |
882 |
assertEquals(0L, lock.tryConvertToWriteLock(s)); |
883 |
assertTrue(lock.validate(s)); |
884 |
assertTrue(lock.validate(p)); |
885 |
assertEquals(2, lock.getReadLockCount()); |
886 |
lock.unlock(p); |
887 |
lock.unlock(s); |
888 |
assertUnlocked(lock); |
889 |
} |
890 |
} |
891 |
|
892 |
/** |
893 |
* asWriteLock can be locked and unlocked |
894 |
*/ |
895 |
public void testAsWriteLock() throws Throwable { |
896 |
StampedLock sl = new StampedLock(); |
897 |
Lock lock = sl.asWriteLock(); |
898 |
for (Action locker : lockLockers(lock)) { |
899 |
locker.run(); |
900 |
assertTrue(sl.isWriteLocked()); |
901 |
assertFalse(sl.isReadLocked()); |
902 |
assertFalse(lock.tryLock()); |
903 |
lock.unlock(); |
904 |
assertUnlocked(sl); |
905 |
} |
906 |
} |
907 |
|
908 |
/** |
909 |
* asReadLock can be locked and unlocked |
910 |
*/ |
911 |
public void testAsReadLock() throws Throwable { |
912 |
StampedLock sl = new StampedLock(); |
913 |
Lock lock = sl.asReadLock(); |
914 |
for (Action locker : lockLockers(lock)) { |
915 |
locker.run(); |
916 |
assertTrue(sl.isReadLocked()); |
917 |
assertFalse(sl.isWriteLocked()); |
918 |
assertEquals(1, sl.getReadLockCount()); |
919 |
locker.run(); |
920 |
assertTrue(sl.isReadLocked()); |
921 |
assertEquals(2, sl.getReadLockCount()); |
922 |
lock.unlock(); |
923 |
lock.unlock(); |
924 |
assertUnlocked(sl); |
925 |
} |
926 |
} |
927 |
|
928 |
/** |
929 |
* asReadWriteLock.writeLock can be locked and unlocked |
930 |
*/ |
931 |
public void testAsReadWriteLockWriteLock() throws Throwable { |
932 |
StampedLock sl = new StampedLock(); |
933 |
Lock lock = sl.asReadWriteLock().writeLock(); |
934 |
for (Action locker : lockLockers(lock)) { |
935 |
locker.run(); |
936 |
assertTrue(sl.isWriteLocked()); |
937 |
assertFalse(sl.isReadLocked()); |
938 |
assertFalse(lock.tryLock()); |
939 |
lock.unlock(); |
940 |
assertUnlocked(sl); |
941 |
} |
942 |
} |
943 |
|
944 |
/** |
945 |
* asReadWriteLock.readLock can be locked and unlocked |
946 |
*/ |
947 |
public void testAsReadWriteLockReadLock() throws Throwable { |
948 |
StampedLock sl = new StampedLock(); |
949 |
Lock lock = sl.asReadWriteLock().readLock(); |
950 |
for (Action locker : lockLockers(lock)) { |
951 |
locker.run(); |
952 |
assertTrue(sl.isReadLocked()); |
953 |
assertFalse(sl.isWriteLocked()); |
954 |
assertEquals(1, sl.getReadLockCount()); |
955 |
locker.run(); |
956 |
assertTrue(sl.isReadLocked()); |
957 |
assertEquals(2, sl.getReadLockCount()); |
958 |
lock.unlock(); |
959 |
lock.unlock(); |
960 |
assertUnlocked(sl); |
961 |
} |
962 |
} |
963 |
|
964 |
/** |
965 |
* Lock.newCondition throws UnsupportedOperationException |
966 |
*/ |
967 |
public void testLockViewsDoNotSupportConditions() { |
968 |
StampedLock sl = new StampedLock(); |
969 |
assertThrows(UnsupportedOperationException.class, |
970 |
() -> sl.asWriteLock().newCondition(), |
971 |
() -> sl.asReadLock().newCondition(), |
972 |
() -> sl.asReadWriteLock().writeLock().newCondition(), |
973 |
() -> sl.asReadWriteLock().readLock().newCondition()); |
974 |
} |
975 |
|
976 |
/** |
977 |
* Passing optimistic read stamps to unlock operations result in |
978 |
* IllegalMonitorStateException |
979 |
*/ |
980 |
public void testCannotUnlockOptimisticReadStamps() { |
981 |
Runnable[] actions = { |
982 |
() -> { |
983 |
StampedLock sl = new StampedLock(); |
984 |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
985 |
sl.unlockRead(stamp); |
986 |
}, |
987 |
() -> { |
988 |
StampedLock sl = new StampedLock(); |
989 |
long stamp = sl.tryOptimisticRead(); |
990 |
sl.unlock(stamp); |
991 |
}, |
992 |
|
993 |
() -> { |
994 |
StampedLock sl = new StampedLock(); |
995 |
long stamp = sl.tryOptimisticRead(); |
996 |
sl.writeLock(); |
997 |
sl.unlock(stamp); |
998 |
}, |
999 |
() -> { |
1000 |
StampedLock sl = new StampedLock(); |
1001 |
sl.readLock(); |
1002 |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
1003 |
sl.unlockRead(stamp); |
1004 |
}, |
1005 |
() -> { |
1006 |
StampedLock sl = new StampedLock(); |
1007 |
sl.readLock(); |
1008 |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
1009 |
sl.unlock(stamp); |
1010 |
}, |
1011 |
|
1012 |
() -> { |
1013 |
StampedLock sl = new StampedLock(); |
1014 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1015 |
assertValid(sl, stamp); |
1016 |
sl.writeLock(); |
1017 |
sl.unlockWrite(stamp); |
1018 |
}, |
1019 |
() -> { |
1020 |
StampedLock sl = new StampedLock(); |
1021 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1022 |
sl.writeLock(); |
1023 |
sl.unlock(stamp); |
1024 |
}, |
1025 |
() -> { |
1026 |
StampedLock sl = new StampedLock(); |
1027 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1028 |
sl.readLock(); |
1029 |
sl.unlockRead(stamp); |
1030 |
}, |
1031 |
() -> { |
1032 |
StampedLock sl = new StampedLock(); |
1033 |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1034 |
sl.readLock(); |
1035 |
sl.unlock(stamp); |
1036 |
}, |
1037 |
|
1038 |
() -> { |
1039 |
StampedLock sl = new StampedLock(); |
1040 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1041 |
assertValid(sl, stamp); |
1042 |
sl.writeLock(); |
1043 |
sl.unlockWrite(stamp); |
1044 |
}, |
1045 |
() -> { |
1046 |
StampedLock sl = new StampedLock(); |
1047 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1048 |
sl.writeLock(); |
1049 |
sl.unlock(stamp); |
1050 |
}, |
1051 |
() -> { |
1052 |
StampedLock sl = new StampedLock(); |
1053 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1054 |
sl.readLock(); |
1055 |
sl.unlockRead(stamp); |
1056 |
}, |
1057 |
() -> { |
1058 |
StampedLock sl = new StampedLock(); |
1059 |
sl.readLock(); |
1060 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1061 |
assertValid(sl, stamp); |
1062 |
sl.readLock(); |
1063 |
sl.unlockRead(stamp); |
1064 |
}, |
1065 |
() -> { |
1066 |
StampedLock sl = new StampedLock(); |
1067 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1068 |
sl.readLock(); |
1069 |
sl.unlock(stamp); |
1070 |
}, |
1071 |
() -> { |
1072 |
StampedLock sl = new StampedLock(); |
1073 |
sl.readLock(); |
1074 |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1075 |
sl.readLock(); |
1076 |
sl.unlock(stamp); |
1077 |
}, |
1078 |
}; |
1079 |
|
1080 |
assertThrows(IllegalMonitorStateException.class, actions); |
1081 |
} |
1082 |
|
1083 |
static long writeLockInterruptiblyUninterrupted(StampedLock sl) { |
1084 |
try { return sl.writeLockInterruptibly(); } |
1085 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1086 |
} |
1087 |
|
1088 |
static long tryWriteLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1089 |
try { return sl.tryWriteLock(time, unit); } |
1090 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1091 |
} |
1092 |
|
1093 |
static long readLockInterruptiblyUninterrupted(StampedLock sl) { |
1094 |
try { return sl.readLockInterruptibly(); } |
1095 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1096 |
} |
1097 |
|
1098 |
static long tryReadLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1099 |
try { return sl.tryReadLock(time, unit); } |
1100 |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1101 |
} |
1102 |
|
1103 |
/** |
1104 |
* Invalid stamps result in IllegalMonitorStateException |
1105 |
*/ |
1106 |
public void testInvalidStampsThrowIllegalMonitorStateException() { |
1107 |
final StampedLock sl = new StampedLock(); |
1108 |
|
1109 |
assertThrows(IllegalMonitorStateException.class, |
1110 |
() -> sl.unlockWrite(0L), |
1111 |
() -> sl.unlockRead(0L), |
1112 |
() -> sl.unlock(0L)); |
1113 |
|
1114 |
final long optimisticStamp = sl.tryOptimisticRead(); |
1115 |
final long readStamp = sl.readLock(); |
1116 |
sl.unlockRead(readStamp); |
1117 |
final long writeStamp = sl.writeLock(); |
1118 |
sl.unlockWrite(writeStamp); |
1119 |
assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L); |
1120 |
final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp }; |
1121 |
final Runnable assertNoLongerValidStampsThrow = () -> { |
1122 |
for (long noLongerValidStamp : noLongerValidStamps) |
1123 |
assertThrows(IllegalMonitorStateException.class, |
1124 |
() -> sl.unlockWrite(noLongerValidStamp), |
1125 |
() -> sl.unlockRead(noLongerValidStamp), |
1126 |
() -> sl.unlock(noLongerValidStamp)); |
1127 |
}; |
1128 |
assertNoLongerValidStampsThrow.run(); |
1129 |
|
1130 |
for (Function<StampedLock, Long> readLocker : readLockers()) |
1131 |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
1132 |
final long stamp = readLocker.apply(sl); |
1133 |
assertValid(sl, stamp); |
1134 |
assertNoLongerValidStampsThrow.run(); |
1135 |
assertThrows(IllegalMonitorStateException.class, |
1136 |
() -> sl.unlockWrite(stamp), |
1137 |
() -> sl.unlockRead(sl.tryOptimisticRead()), |
1138 |
() -> sl.unlockRead(0L)); |
1139 |
readUnlocker.accept(sl, stamp); |
1140 |
assertUnlocked(sl); |
1141 |
assertNoLongerValidStampsThrow.run(); |
1142 |
} |
1143 |
|
1144 |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
1145 |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
1146 |
final long stamp = writeLocker.apply(sl); |
1147 |
assertValid(sl, stamp); |
1148 |
assertNoLongerValidStampsThrow.run(); |
1149 |
assertThrows(IllegalMonitorStateException.class, |
1150 |
() -> sl.unlockRead(stamp), |
1151 |
() -> sl.unlockWrite(0L)); |
1152 |
writeUnlocker.accept(sl, stamp); |
1153 |
assertUnlocked(sl); |
1154 |
assertNoLongerValidStampsThrow.run(); |
1155 |
} |
1156 |
} |
1157 |
|
1158 |
/** |
1159 |
* Read locks can be very deeply nested |
1160 |
*/ |
1161 |
public void testDeeplyNestedReadLocks() { |
1162 |
final StampedLock lock = new StampedLock(); |
1163 |
final int depth = 300; |
1164 |
final long[] stamps = new long[depth]; |
1165 |
final List<Function<StampedLock, Long>> readLockers = readLockers(); |
1166 |
final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers(); |
1167 |
for (int i = 0; i < depth; i++) { |
1168 |
Function<StampedLock, Long> readLocker |
1169 |
= readLockers.get(i % readLockers.size()); |
1170 |
long stamp = readLocker.apply(lock); |
1171 |
assertEquals(i + 1, lock.getReadLockCount()); |
1172 |
assertTrue(lock.isReadLocked()); |
1173 |
stamps[i] = stamp; |
1174 |
} |
1175 |
for (int i = 0; i < depth; i++) { |
1176 |
BiConsumer<StampedLock, Long> readUnlocker |
1177 |
= readUnlockers.get(i % readUnlockers.size()); |
1178 |
assertEquals(depth - i, lock.getReadLockCount()); |
1179 |
assertTrue(lock.isReadLocked()); |
1180 |
readUnlocker.accept(lock, stamps[depth - 1 - i]); |
1181 |
} |
1182 |
assertUnlocked(lock); |
1183 |
} |
1184 |
} |