See: Description
Interface | Description |
---|---|
Condition |
Condition factors out the Object monitor
methods (wait , notify
and notifyAll ) into distinct objects to
give the effect of having multiple wait-sets per object, by
combining them with the use of arbitrary Lock implementations. |
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. |
Class | Description |
---|---|
ReentrantLock |
A reentrant mutual exclusion
Lock with the same basic
behavior and semantics as the implicit monitor lock accessed using
synchronized methods and statements, but with extended
capabilities. |
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() . |
The Lock
interface supports
locking disciplines that differ in semantics (reentrant, fair, etc),
and that can be used in non-block-structured contexts including
hand-over-hand and lock reordering algorithms. The main implementation
is ReentrantLock
.
The ReadWriteLock
interface
similarly defines locks that may be shared among readers but are
exclusive to writers. Only a single implementation, ReentrantReadWriteLock
, is provided, since
it covers most standard usage contexts. But programmers may create
their own implementations to cover nonstandard requirements.
The Condition
interface
describes condition variables that may be associated with Locks.
These are similar in usage to the implicit monitors accessed using
Object.wait, but offer extended capabilities. In particular,
multiple Condition objects may be associated with a single
Lock. To avoid compatibility issues, the names of
Condition methods are different than the corresponding
Object versions.