org.logicalcobwebs.concurrent
类 WriterPreferenceReadWriteLock

java.lang.Object
  org.logicalcobwebs.concurrent.WriterPreferenceReadWriteLock

所有已实现的接口：

ReadWriteLock

直接已知子类：

ReaderPreferenceReadWriteLock

public class WriterPreferenceReadWriteLock
extends 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. ]

嵌套类摘要

protected class	WriterPreferenceReadWriteLock.ReaderLock
protected class	WriterPreferenceReadWriteLock.Signaller Reader and Writer requests are maintained in two different wait sets, by two different objects.
protected class	WriterPreferenceReadWriteLock.WriterLock

字段摘要

protected long	activeReaders_
protected Thread	activeWriter_
protected WriterPreferenceReadWriteLock.ReaderLock	readerLock_
protected long	waitingReaders_
protected long	waitingWriters_
protected WriterPreferenceReadWriteLock.WriterLock	writerLock_

构造方法摘要

WriterPreferenceReadWriteLock()

方法摘要

protected boolean	allowReader() Override this method to change to reader preference
protected void	cancelledWaitingReader()
protected void	cancelledWaitingWriter()
protected WriterPreferenceReadWriteLock.Signaller	endRead() Called upon termination of a read.
protected WriterPreferenceReadWriteLock.Signaller	endWrite() Called upon termination of a write.
Sync	readLock() get the readLock
protected boolean	startRead()
protected boolean	startReadFromNewReader()
protected boolean	startReadFromWaitingReader()
protected boolean	startWrite()
protected boolean	startWriteFromNewWriter()
protected boolean	startWriteFromWaitingWriter()
Sync	writeLock() get the writeLock

从类 java.lang.Object 继承的方法

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

字段详细信息

activeReaders_

protected long activeReaders_

activeWriter_

protected Thread activeWriter_

waitingReaders_

protected long waitingReaders_

waitingWriters_

protected long waitingWriters_

readerLock_

protected final WriterPreferenceReadWriteLock.ReaderLock readerLock_

writerLock_

protected final WriterPreferenceReadWriteLock.WriterLock writerLock_

构造方法详细信息

WriterPreferenceReadWriteLock

public WriterPreferenceReadWriteLock()

方法详细信息

writeLock

public Sync writeLock()

从接口 ReadWriteLock 复制的描述

get the writeLock

指定者：

接口 ReadWriteLock 中的 writeLock

readLock

public Sync readLock()

从接口 ReadWriteLock 复制的描述

get the readLock

指定者：

接口 ReadWriteLock 中的 readLock

cancelledWaitingReader

protected void cancelledWaitingReader()

cancelledWaitingWriter

protected void cancelledWaitingWriter()

allowReader

protected boolean allowReader()

Override this method to change to reader preference

startRead

protected boolean startRead()

startWrite

protected boolean startWrite()

startReadFromNewReader

protected boolean startReadFromNewReader()

startWriteFromNewWriter

protected boolean startWriteFromNewWriter()

startReadFromWaitingReader

protected boolean startReadFromWaitingReader()

startWriteFromWaitingWriter

protected boolean startWriteFromWaitingWriter()

endRead

protected WriterPreferenceReadWriteLock.Signaller endRead()

Called upon termination of a read. Returns the object to signal to wake up a waiter, or null if no such

endWrite

protected WriterPreferenceReadWriteLock.Signaller endWrite()

Called upon termination of a write. Returns the object to signal to wake up a waiter, or null if no such