Class Semaphore

java.lang.Object
  |
  +--Semaphore

public class Semaphore

extends java.lang.Object

Uses Java monitor primitives to implement semaphore. $RCSfile: Semaphore.java,v $

Constructor Summary

Semaphore()
Default constructor, initializes to 0.

Semaphore(int i)
Constructor with initialization.

Method Summary

void	P() Acquires the semaphore: < await(val > 0) val = val - 1 >
void	V() Releases the semaphore: < val = val + 1 >

Methods inherited from class java.lang.Object

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

Constructor Detail

Semaphore

public Semaphore(int i)

Constructor with initialization.

Parameters:

i - Initial value for semaphore (>= 0)

Semaphore

public Semaphore()

Default constructor, initializes to 0.

Method Detail

V

public void V()

Releases the semaphore: < val = val + 1 >

P

public void P()
       throws java.lang.InterruptedException

Acquires the semaphore: < await(val > 0) val = val - 1 >

Throws:

java.lang.InterruptedException