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Locks
Interfaces and classes providing a framework for locking and waiting
for conditions that is distinct from built-in synchronization and
monitors. The framework permits much greater flexibility in the use of
locks and conditions, at the expense of more awkward syntax.
The {@link edu.emory.mathcs.backport.java.util.concurrent.locks.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 {@link edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantLock}.
The {@link edu.emory.mathcs.backport.java.util.concurrent.locks.ReadWriteLock} interface
similarly defines locks that may be shared among readers but are
exclusive to writers. Only a single implementation, {@link
edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantReadWriteLock}, is provided, since
it covers most standard usage contexts. But programmers may create
their own implementations to cover nonstandard requirements.
The {@link edu.emory.mathcs.backport.java.util.concurrent.locks.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.
@since 1.5