| 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. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ReentrantReadWriteLockAn implementation of  ReadWriteLocksupporting similar
 semantics toReentrantLock. | 
| Modifier and Type | Method and Description | 
|---|---|
| ReadWriteLock | StampedLock. asReadWriteLock()Returns a  ReadWriteLockview of this StampedLock in
 which thereadLock()method is mapped toStampedLock.asReadLock(), andwriteLock()toStampedLock.asWriteLock(). | 
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