From: Brian Candler <B.Candler@...>
Date: 2003-04-17T06:30:42+09:00
Subject: Re: example

On Thu, Apr 17, 2003 at 05:54:49AM +0900, daniel wrote:
> I'm goint to write a ruby extension for an extern hardware tool.
> When my extension receives data (i.e.) from the serial
> interface (com1), a function in the ruby code should be
> ``executed??
> 
> So I'm searching now for a simple example which show how
> to implement callback functions.
> 
> Does anybody known a good link for this?

I don't know about good links... but if I were doing this, I would run the
data receiver as a separate thread. It then simply has to receive messages,
and when it has a complete message that it wants to do something with, it
just does. This might mean putting it in a queue which the main thread picks
from. You can use mutexes and condition variables to make the queue
thread-safe, and to allow the main thread to sleep until a message arrives.
I'd recommend you start with the Pickaxe chapter on threading, and then
there are a number of threading examples on the Wiki
(http://www.rubygarden.org/ruby)

I seem to remember seeing a module for handling serial ports on RAA
somewhere.

Cheers,

Brian.