From: 7stud -- <bbxx789_05ss@...>
Date: 2009-09-03T11:55:38+09:00
Subject: Re: Threads - running something in background

Alex Zunega wrote:
> Hey guys,
> 
>  I've been studying Ruby for some weeks now but when it comes to
> threads, I know that I am totally unskilled.
> 

Also, you should realize that the @i in the class and the @i in the 
thread are the same variable.
Therefore, things like this can happen:

class Updater
  attr_accessor :i

  def initialize
    @i = 0

    Thread.new do
      loop do
        sleep(0.3)
        @i += 1
        puts "....#{@i}"
      end
    end

  end

end


upd = Updater.new

3.times do
  sleep(2)
  puts upd.i

  upd.i = 0    #<-----******
end

--output:--
....1
....2
....3
....4
....5
....6
6
....1
....2
....3
....4
....5
....6
....7
7
....1
....2
....3
....4
....5
....6
6


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