From: Ara.T.Howard@...
Date: 2004-11-06T09:53:41+09:00
Subject: Re: Threaded Observer

On Sat, 6 Nov 2004, James Edward Gray II wrote:

> Help Thread gurus!  :D
>
> Why is the following code not printing the time every three second the
> "Clock" is running, as I believe it should be?
>
> #!/usr/bin/env ruby
>
> require "observer"
> require "singleton"
>
> class Clock
> 	include Observable
> 	include Singleton
>
> 	def start( seconds_delay )
> 		@thread = Thread.new(self, seconds_delay) do |notifier, delay|
> 			loop do
> 				puts "Notifying..."
> 				notifier.notify_observers
> 				sleep delay
> 			end
> 		end
> 	end
>
> 	def stop
> 		unless @thread.nil?
> 			@thread.kill
> 			@thread = nil
> 		end
> 	end
> end
>
> if $0 == __FILE__
> 	class TimePrinter
> 		def update
> 			puts Time.now
> 		end
> 	end
>
> 	clock = Clock.instance
> 	clock.add_observer TimePrinter.new
>
> 	puts "Starting clock..."
> 	clock.start 3
> 	sleep 10
> 	clock.stop
> 	puts "Clock stopped..."
> 	sleep 10
> end
>
> __END__
>
> Thanks.
>
> James Edward Gray II

it does for me.  on linux.  are you on windows?  if so the IO (puts) is
probably causing the whole process to sleep.

regards.

-a
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