| Package | Description | 
|---|---|
| java.util.concurrent.locks | Interfaces and classes providing a framework for locking and waiting
 for conditions that is distinct from built-in synchronization and
 monitors. | 
| Class and Description | 
|---|
| AbstractOwnableSynchronizer A synchronizer that may be exclusively owned by a thread. | 
| AbstractQueuedLongSynchronizer.ConditionObject Condition implementation for a  AbstractQueuedLongSynchronizerserving as the basis of aLockimplementation. | 
| AbstractQueuedSynchronizer.ConditionObject Condition implementation for a  AbstractQueuedSynchronizerserving as the basis of aLockimplementation. | 
| Condition | 
| Lock Lockimplementations provide more extensive locking
 operations than can be obtained usingsynchronizedmethods
 and statements. | 
| ReadWriteLock A  ReadWriteLockmaintains a pair of associatedlocks, one for read-only operations and one for writing. | 
| ReentrantReadWriteLock An implementation of  ReadWriteLocksupporting similar
 semantics toReentrantLock. | 
| ReentrantReadWriteLock.ReadLock The lock returned by method  ReentrantReadWriteLock.readLock(). | 
| ReentrantReadWriteLock.WriteLock The lock returned by method  ReentrantReadWriteLock.writeLock(). | 
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