From: Hans Fugal <fugalh@...>
Date: 2008-02-22T02:59:54+09:00
Subject: Re: Timers and Alarms

On Feb 21, 8:42 am, "Eric I." <rubytrain...@gmail.com> wrote:
> On Feb 21, 10:17 am, Hans Fugal <fug...@zianet.com> wrote:
>
> > I want a program to wait for some moment in time, and resume operation
> > at that moment. sleep is ruled out because it just counts cycles and is
> > thrown off when my laptop suspends.
>
> What about a roll-your-own solution like:
>
> def my_sleep(interval, granularity = 60)
>   end_time = Time.now + interval
>
>   remaining = end_time - Time.now
>   while granularity < remaining
>     sleep granularity
>     remaining = end_time - Time.now
>   end
>
>   sleep remaining
> end

It's going to have to be something like this I think. I don't know how
much impact waking every so often (about once per second in my
situation) will have on power usage, but I see now that even setitimer
in C suffers the same problem sleep does with laptop suspend.