psimjava
Class Csemaphore

java.lang.Object
  psimjava.Csemaphore

public class Csemaphore
extends java.lang.Object

PsimJ Java package for OO simulation

Object-oriented simulation package, process interaction approach.

(C) J. M. Garrido. June 2000 Rev.2003, 2004, Oct. 2007 Counting semaphore class.

File: Csemaphore.java

Constructor Summary

Csemaphore(java.lang.String name, int initval)
Constructor for the counting semaphore object

Method Summary

void	csignal() This method increments the semaphore object Then the method reactivates and removes from the semaphore queue any waiting processes.
void	cwait() This method allows the requesting process to decrement the semaphore if possible.
java.lang.String	get_name() This method returns the name of the semaphore object
int	length() This method gets the number of waiting processes.

Methods inherited from class java.lang.Object

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

Constructor Detail

Csemaphore

public Csemaphore(java.lang.String name,
                  int initval)

Constructor for the counting semaphore object

Parameters:

name - the title for the semaphore object

initval - the initial value of csem attribute

Method Detail

get_name

public java.lang.String get_name()

This method returns the name of the semaphore object

cwait

public void cwait()

This method allows the requesting process to decrement the semaphore if possible. The requesting process is suspended and placed in the semaphore queue, if it cannot immediately decrement the semaphore.

length

public int length()

This method gets the number of waiting processes.

Returns:

int Number of Waiting processes

csignal

public void csignal()

This method increments the semaphore object Then the method reactivates and removes from the semaphore queue any waiting processes.