Re: select/poll bug?

["Greg A. Woods; Planix, Inc." <woods%planix.ca@localhost>]

On 3-Aug-08, at 2:29 PM, Roy Marples wrote:

> On Sun, 2008-08-03 at 13:18 -0400, Greg A. Woods; Planix, Inc. wrote:
> > You still haven't said why you need a timer that can handle in one
> > setting the span of the entire maximum possible lease time.  Why not
> > set a regular interval timeout and decrement the elapsed time from  
> > the
> > lease TTL every time the timeout happens until finally there's no  
> > time
> > remaining on the lease, perhaps adjusting the interval of the timeout
> > as the lease nears its expiry time.
>
> It doesn't HAVE to be the max possible lease. It's more effecient to
> make one call than lots of small calls, hence the bigger the timeout  
> the
> more efficient the program.
>
> dhcpcd currently does what you describe around poll, using INT_MAX as
> the upper limit.

I think you're falling for the old "premature optimization" fallacy.

Even if you used 60 seconds as the initial timeout, i.e. with the  
final timeout being the remainder of the lease time mod 60, then you'd  
still only be running a VERY few CPU cycles per minute, hardly an  
annoyance even on a Commodor-64 class machine, never mind anything  
semi-modern.

--
                                        Greg A. Woods; Planix, Inc.
                                        <woods%planix.ca@localhost>