Class Sema

java.lang.Object
  Sema

public class Sema
extends java.lang.Object

Semaphore. This class implements a semaphore.

Author:

Akitoshi Yoshida, Heinz Kredel.

Field Summary

private int	del
private int	init
private int	s

Constructor Summary

Sema()
Constructs a default semaphore.

Sema(int i)
Constructs a semaphore with the given upper limit value.

Method Summary

protected void	finalize() Releases the ressources of the constructed semaphore.
boolean	isPositive() checks if Semaphore is positive.
void	P() Performs the P operation, which causes the current thread to wait until the semaphore is positive.
void	V() The V operation increases the value of s.

Methods inherited from class java.lang.Object

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

Field Detail

init

private int init

s

private int s

del

private int del

Constructor Detail

Sema

public Sema()

Constructs a default semaphore.

Sema

public Sema(int i)

Constructs a semaphore with the given upper limit value.

Parameters:

i - limit.

Method Detail

finalize

protected void finalize()
                 throws java.lang.Throwable

Releases the ressources of the constructed semaphore.

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

P

public void P()

Performs the P operation, which causes the current thread to wait until the semaphore is positive.

V

public void V()

The V operation increases the value of s.

isPositive

public boolean isPositive()

checks if Semaphore is positive.