From: "Ara.T.Howard" <ahoward@...>
Date: 2004-05-06T02:23:57+09:00
Subject: Re: signaling another thread

On Thu, 6 May 2004, Joel VanderWerf wrote:

> Ara.T.Howard wrote:
> > 
> > what is is the prefered method in which one thread can 'signal' another thread
> > on some condition?  Observable?  other?
> 
> One way is to use Thread#raise:
> 
> $ cat thread-signal.rb
>    class PayAttention < Exception; end
> 
>    other = Thread.new do
>      i=0
>      begin
>        loop do
>          sleep 1
>          i += 1 # important work
>        end
>      rescue PayAttention
>        puts i
>        retry if i < 10
>      end
>    end
> 
>    watch = Thread.new do
>      loop do
>        sleep 3
>        other.raise PayAttention
>      end
>    end
> 
>    other.join
> 
> $ ruby thread-signal.rb
> 2
> 4
> 6
> 8
> 10
> $

nice - i'll take it.  thanks.

-a
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