org.jboss.util
Class Semaphore

java.lang.Object
  |
  +--org.jboss.util.Semaphore

All Implemented Interfaces:

Sync

Direct Known Subclasses:

BeanSemaphore, WaitSemaphore

public class Semaphore

extends java.lang.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: 1.2.4.1 $

Author:

Simone Bordet (simone.bordet@compaq.com)

Constructor Summary

Semaphore(int allowed)

Method Summary

void	acquire() Acquires this sync
int	getUsers()
protected void	logAcquire()
protected void	logDeadlock()
protected void	logRelease()
void	release() Releases this sync
java.lang.String	toString()
protected boolean	waitImpl(java.lang.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 java.lang.InterruptedException

Description copied from interface: Sync

Acquires this sync

Specified by:

acquire in interface Sync

Following copied from interface: org.jboss.util.Sync

See Also:

Sync.release()

release

public void release()

Description copied from interface: Sync

Releases this sync

Specified by:

release in interface Sync

Following copied from interface: org.jboss.util.Sync

See Also:

Sync.acquire()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

waitImpl

protected boolean waitImpl(java.lang.Object lock)
                    throws java.lang.InterruptedException

logAcquire

protected void logAcquire()

logDeadlock

protected void logDeadlock()

logRelease

protected void logRelease()