monitor
Class Semaphore

java.lang.Object
  monitor.Semaphore

public class Semaphore
extends java.lang.Object

A FIFO semaphore.

Version:

2.0

Author:

Theodore S. Norvell

Constructor Summary

Semaphore(int initial_value)
Initialize the semaphore to a value greater or equal to 0

Method Summary

void	acquire() The P operation.
void	acquire(int priority) The P operation with a priority.
void	release() The V operation

Methods inherited from class java.lang.Object

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

Constructor Detail

Semaphore

public Semaphore(int initial_value)

Initialize the semaphore to a value greater or equal to 0

Method Detail

acquire

public void acquire()

The P operation. If two threads are blocked at the same time, they will be served in FIFO order. sem.acquire() is equivalent to acquire( Integer.MAX_VALUE ).

acquire

public void acquire(int priority)

The P operation with a priority.

Parameters:

priority - The larger the integer, the less urgent the priority. If two thread are waiting with equal priority, they will complete acquire in FIFO order.

release

public void release()

The V operation