Re: select/poll bug?

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

On 3-Aug-08, at 2:45 AM, Roy Marples wrote:

> On Sat, 2008-08-02 at 22:07 -0400, Greg A. Woods; Planix, Inc. wrote:
> > I'm not sure why you want to set a timer for the whole lease.
> >
> > Why not set a regular timer and decrement the remaining lease TTL on
> > that interval?
> >
> > The extra CPU cycles through such a loop, even counting all the  
> > kernel
> > time for the system call transitions, is inevitably negligible over
> > such periods as DAYS.
>
> For the duration of the lease we need to monitor a signal pipe and the
> fd for link carrier messages. As select,poll and friends have timeouts
> it makes sense to use them instead of calls like setitimer.

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.

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