nachos.threads
Class Communicator

java.lang.Object
  |
  +--nachos.threads.Communicator

public class Communicator

extends Object

A communicator allows threads to synchronously exchange 32-bit messages. Multiple threads can be waiting to speak, and multiple threads can be waiting to listen. But there should never be a time when both a speaker and a listener are waiting, because the two threads can be paired off at this point.

Constructor Summary

Communicator()
Allocate a new communicator.

Method Summary

int	listen() Wait for a thread to speak through this communicator, and then return the word that thread passed to speak().
void	speak(int word) Wait for a thread to listen through this communicator, and then transfer word to the listener.

Methods inherited from class java.lang.Object

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

Constructor Detail

Communicator

public Communicator()

Allocate a new communicator.

Method Detail

speak

public void speak(int word)

Wait for a thread to listen through this communicator, and then transfer word to the listener.

Does not return until this thread is paired up with a listening thread. Exactly one listener should receive word.

Parameters:

word - the integer to transfer.

listen

public int listen()

Wait for a thread to speak through this communicator, and then return the word that thread passed to speak().

Returns:

the integer transferred.