EDU.oswego.cs.dl.util.concurrent
Class WriterPreferenceReadWriteLock

java.lang.Object
  |
  +--EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock

All Implemented Interfaces:

ReadWriteLock

Direct Known Subclasses:

ReaderPreferenceReadWriteLock, ReentrantWriterPreferenceReadWriteLock

public class WriterPreferenceReadWriteLock

extends java.lang.Object

implements ReadWriteLock

A ReadWriteLock that prefers waiting writers over waiting readers when there is contention. This class is adapted from the versions described in CPJ, improving on the ones there a bit by segregating reader and writer wait queues, which is typically more efficient.

The locks are NOT reentrant. In particular, even though it may appear to usually work OK, a thread holding a read lock should not attempt to re-acquire it. Doing so risks lockouts when there are also waiting writers.

[ Introduction to this package. ]

Constructor Summary

WriterPreferenceReadWriteLock()

Method Summary

Sync	readLock() get the readLock
Sync	writeLock() get the writeLock

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WriterPreferenceReadWriteLock

public WriterPreferenceReadWriteLock()

Method Detail

writeLock

public Sync writeLock()

Description copied from interface: ReadWriteLock

get the writeLock

Specified by:

writeLock in interface ReadWriteLock

readLock

public Sync readLock()

Description copied from interface: ReadWriteLock

get the readLock

Specified by:

readLock in interface ReadWriteLock