From: ara.t.howard@...
Date: 2006-10-27T05:26:15+09:00
Subject: Re: threads

On Fri, 27 Oct 2006, Francis Cianfrocca wrote:

> On 10/24/06, Brad Tilley <rtilley@vt.edu> wrote:
>> 
>> I'm rewriting some old Python scripts in Ruby. Just to learn a bit more.
>> I want to thread this code to check websites concurrently. Could somone
>> offer advice? What are reasonable limits on threads in Ruby?
>
>
>
> Here's an EventMachine code sample that should do what you need. Notice,
> this code is nonthreaded, but it still does all the HTTP GETs
> simultaneously. Of course you'll want to do something more interesting in
> the http.callback block.
>
> #-------------------------------------
>
> require 'rubygems'
> require 'eventmachine'
>
> $addrs = [
> "www.apple.com",
> "www.cisco.com",
> "www.microsoft.com"
> ]
>
> def scan_addr addr
> http = EventMachine::Protocols::HttpClient.request(
>   :host => addr,
>   :port => 80,
>   :request => "/"
> )
>
> http.callback {|response|
>   puts response[:status]
>   puts response[:headers]
>   puts response[:content].length
> }
> end
>
> EventMachine.run {
> $addrs.each {|addr| scan_addr addr}
> }

what would the preferrer way by to shared data from http.callback?  does it
need protection?  how about sharing with ruby green threads?

cheers.

-a
-- 
my religion is very simple.  my religion is kindness. -- the dalai lama