| 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  
AbstractQueuedLongSynchronizer serving as the basis of a Lock implementation. | 
| AbstractQueuedSynchronizer.ConditionObject
 Condition implementation for a  
AbstractQueuedSynchronizer serving as the basis of a Lock implementation. | 
| Condition | 
Lock
Lock implementations provide more extensive locking
 operations than can be obtained using synchronized methods
 and statements. | 
| ReadWriteLock
 A  
ReadWriteLock maintains a pair of associated locks, one for read-only operations and one for writing. | 
| ReentrantReadWriteLock
 An implementation of  
ReadWriteLock supporting similar
 semantics to ReentrantLock. | 
| ReentrantReadWriteLock.ReadLock
 The lock returned by method  
ReentrantReadWriteLock.readLock(). | 
| ReentrantReadWriteLock.WriteLock
 The lock returned by method  
ReentrantReadWriteLock.writeLock(). | 
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