serp.util
Class Semaphore

java.lang.Object
  |
  +--serp.util.Semaphore

All Implemented Interfaces:

Serializable

public class Semaphore

extends Object

implements Serializable

Semaphore implementation.

See Also:

Serialized Form

Constructor Summary

Semaphore()
Construct the semaphore with an initial available count of 1.

Semaphore(int available)
Construct the semaphore with an initial available count of avaiable.

Method Summary

void	down() Down the semaphore's available count.
boolean	down(long timeout) Down the semaphore's available count.
int	getAvailable() Returns the current available count.
void	up() Up the semaphore.

Methods inherited from class java.lang.Object

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

Constructor Detail

Semaphore

public Semaphore()

Construct the semaphore with an initial available count of 1.

Semaphore

public Semaphore(int available)

Construct the semaphore with an initial available count of avaiable.

Method Detail

getAvailable

public int getAvailable()

Returns the current available count.

down

public void down()

Down the semaphore's available count. If the count is at 0, this call will block until the semaphore is up()'d.

down

public boolean down(long timeout)

Down the semaphore's available count. If the count is at 0, this call will block until the semaphore is up()'d or the given timeout elapses.

Returns:

true if the semaphore was down'd, false on timeout

up

public void up()

Up the semaphore.