From: Paul Brannan <pbrannan@...>
Date: 2002-06-07T22:35:58+09:00
Subject: Re: 1-second events

On Fri, Jun 07, 2002 at 09:25:48AM +0900, Nobuyoshi Nakada wrote:
> This is based on yours. 
> 
>   def periodically(sec, *args)
>     loop do
>       t = Thread.new {sleep sec}
>       yield(*args)
>       t.join
>     end
>   end
> 
>   periodically 1.0 do
>     p Time.now
>     sleep 0.5
>   end

I like the simplicity of this solution.  But if I change:
  p Time.now
to
  puts "#{Time.now.tv_sec}.#{Time.now.tv_usec}"
then I see quite a lot of drift:
 1023456778.810465
 1023456779.815316
 1023456780.825325
 1023456781.835464
 1023456782.845571
 1023456783.855783
 1023456784.865900
 1023456785.876033
 1023456786.886212
 1023456787.896280
 1023456788.896795
 1023456789.906567
 1023456790.916710

Over the course of a day I would expect to eventually lose a second.

Paul