org.jboss.util

Class Semaphore

java.lang.Object

org.jboss.util.Semaphore

All Implemented Interfaces:

Sync

Direct Known Subclasses:

WaitSemaphore

public class Semaphore
extends Object
implements Sync

Semaphore that can allow a specified number of threads to enter, blocking the others. If the specified number of threads is 1, it acts as an exclusive semaphore and can be used instead of synchronized blocks

Version:

$Revision$

Author:

Simone Bordet

Constructor Summary

Constructors

Constructor and Description
Semaphore(int allowed)

Method Summary

Methods

Modifier and Type	Method and Description
void	acquire() Acquires this sync
int	getUsers()
protected void	logAcquire()
protected void	logDeadlock()
protected void	logRelease()
void	release() Releases this sync
String	toString()
protected boolean	waitImpl(Object lock)

Methods inherited from class java.lang.Object

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

Constructor Detail

Semaphore

public Semaphore(int allowed)

Method Detail

getUsers

public int getUsers()

acquire

public void acquire()
             throws InterruptedException

Description copied from interface: Sync

Acquires this sync

Specified by:

acquire in interface Sync

Throws:

InterruptedException

See Also:

Sync.release()

release

public void release()

Description copied from interface: Sync

Releases this sync

Specified by:

release in interface Sync

See Also:

Sync.acquire()

toString

public String toString()

Overrides:

toString in class Object

waitImpl

protected boolean waitImpl(Object lock)
                    throws InterruptedException

Throws:

InterruptedException

logAcquire

protected void logAcquire()

logDeadlock

protected void logDeadlock()

logRelease

protected void logRelease()