From: 7stud -- <bbxx789_05ss@...>
Date: 2009-09-03T11:49:10+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.
> 
> I am trying to build a class which is able to keep updating itself every
> X seconds after being initialized. In general terms it would work like
> this:
> 
> ----
> class Threading_Test
>   attr_accessor :i
>   def initialize
>     @i = 0
>     @j = 0
>     neverstop = false
> 
>     t1 = Thread.new do
>             while neverstop == false do
>               sleep 0.1 #here's the the problem.
>               @i = @i + 1
>             end
>           end
> 
>     t1.run
> 
>     puts "I am ready and I keep updating myself. Or not..."
>   end
> end
> ----
> 
> 
> The problem occurs when I try to add this "sleep 0.1" into the thread
> block.  The thread only seems to become active when I ask for the @i
> value.
> 

I'm not sure what you mean.  Try this:

class Updater
  attr_accessor :i

  def initialize
    @i = 0

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

  end

end


upd = Updater.new

5.times do
  sleep(2)
  puts upd.i
end

Here is my output:
....1
1
....2
....3
3
....4
....5
5
....6
....7
7
....8
....9
9

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