| 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 | Description | 
|---|---|---|
| class  | AbstractQueuedLongSynchronizerA version of  AbstractQueuedSynchronizerin
 which synchronization state is maintained as along. | |
| class  | AbstractQueuedSynchronizerProvides a framework for implementing blocking locks and related
 synchronizers (semaphores, events, etc) that rely on
 first-in-first-out (FIFO) wait queues. | 
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