moss.kernel
Class Semaphore

java.lang.Object
  moss.kernel.Semaphore

public class Semaphore
extends java.lang.Object

This class provides a low-level semaphore. Unlike MSemaphore(), this will "hold up" a virtual-processor if it waits.

Constructor Summary

Semaphore()
creates and initialises a semaphore (default is to 1, for a mutex)

Semaphore(int value)
creates and initialises a semaphore to the given value

Method Summary

void	sem_signal() signal this semaphore
boolean	sem_wait() wait on this semaphore

Methods inherited from class java.lang.Object

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

Constructor Detail

Semaphore

public Semaphore()

creates and initialises a semaphore (default is to 1, for a mutex)

Semaphore

public Semaphore(int value)

creates and initialises a semaphore to the given value

Parameters:

value - initial semaphore value

Method Detail

sem_wait

public boolean sem_wait()

wait on this semaphore

Returns:

true if the wait completed successfully, false if the (Java) thread was interrupted whilst waiting

sem_signal

public void sem_signal()

signal this semaphore