org.jboss.util

Class Semaphore

java.lang.Object

org.jboss.util.Semaphore

All Implemented Interfaces:

Sync

Direct Known Subclasses:

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:

$Revision$

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	Semaphore.Info

Field Summary

Fields

Modifier and Type	Field and Description
private static long	DEADLOCK_TIMEOUT
private int	m_allowed
private static boolean	m_debug
private java.util.Map	m_logMap
private int	m_users

Constructor Summary

Constructors

Constructor and Description
Semaphore(int allowed)

Method Summary

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
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

Field Detail

DEADLOCK_TIMEOUT

private static final long DEADLOCK_TIMEOUT

See Also:

Constant Field Values

m_debug

private static final boolean m_debug

See Also:

Constant Field Values

m_users

private int m_users

m_allowed

private int m_allowed

m_logMap

private java.util.Map m_logMap

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

Throws:

java.lang.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 java.lang.String toString()

Overrides:

toString in class java.lang.Object

waitImpl

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

Throws:

java.lang.InterruptedException

logAcquire

protected void logAcquire()

logDeadlock

protected void logDeadlock()

logRelease

protected void logRelease()