From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-08-12T16:26:23+09:00
Subject: Re: Multithreading problem

On Thu, Aug 12, 2010 at 5:09 AM, Paul Harrington <xeno@badenoughdu.de> wrote:
> Pen Ttt wrote:
>> probem1:
>> the following program can only run  in irb console,it can't run with
>> command :
>> ruby /home/test.rb,why?
>> require 'rubygems'
>> require 'net/http'
>> threads = []
>> open("/home/pt/test/data","a+") do |wfile|
>> str=%w(http://table.finance.yahoo.com/table.csv?s=IBM
>> http://table.finance.yahoo.com/table.csv?s=YHOO
>> http://table.finance.yahoo.com/table.csv?s=AACC)
>> for page_to_fetch in str
>>    Thread.new(page_to_fetch) do |url|
>>     info = Net::HTTP.get_response(URI.parse(url)).body
>>     puts info
>>    end
>>  end
>> threads.each {|thr| thr.join}
>> end
>
> threads is still an empty array. Try adding each thread to threads as
> you create it.

An idiom I usually use is this:

threads = str.map do
  Thread.new [...snip...]
end

threads.each {|t| t.join}

Jesus.