From: 7stud -- <bbxx789_05ss@...>
Date: 2008-02-21T11:55:31+09:00
Subject: Re: trouble with threads

gm gm wrote:
> I am trying to expand my web crawler to use multiple threads (with
> mechanize), and I ma having some trouble. It seems that each thread is
> not creating a local variable, but rather they are sharing the "index"
> variable 


threads = []

10.times do |i|
  threads[i] = Thread.new(i) do |index|
    if index == 0
      index += 100
    end

    puts index

  end
end

threads.each do |t|
  t.join
end

--output:--
100
1
2
3
4
5
6
7
8
9


If the threads shared the index variable, then each line of the output 
would be 100.  Instead, i gets assigned to index for each thread, and 
nothing a thread does to its index variable has any effect on another 
thread's index variable.
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