FIFOReadWriteLock

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org.ematgine.utils.concurrent
Class FIFOReadWriteLock

java.lang.Object
  org.ematgine.utils.concurrent.FIFOReadWriteLock

All Implemented Interfaces:: ReadWriteLock

public class FIFOReadWriteLock
extends java.lang.Object
implements ReadWriteLock

This class implements a policy for reader/writer locks in which incoming readers and writers contend in generally fair manner for entry. When one reader enters, all others may enter. When the last reader exits a waiting writer may enter. This does not provide globally FIFO behavior since readers arriving after a writer may join other readers (in the style of a Reader's preference RW lock). But it does ensure FIFO ordering across writers, so earlier writers will write first, modulo the caveats discussed with FIFOSemaphore, which is used for queuing.

[ Introduction to this package. ]

Nested Class Summary

(package private) class FIFOReadWriteLock.ReaderSync


Field Summary

protected FIFOSemaphore active_
          FIFO queue of threads waiting for access Also serves as the Writer lock

protected Sync readerSync_
          Control reader access to active semaphore

Constructor Summary

FIFOReadWriteLock()


Method Summary

Sync readLock()
          get the readLock

Sync writeLock()
          get the writeLock

Methods inherited from class java.lang.Object

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

Field Detail

active_

protected final FIFOSemaphore active_

FIFO queue of threads waiting for access Also serves as the Writer lock

readerSync_

protected final Sync readerSync_

Control reader access to active semaphore

Constructor Detail