Re: select() clobbering the timeout

Roger Espel Llima (espel@llaic.u-clermont1.fr)
Tue, 11 May 1999 20:51:28 +0200

On Tue, May 11, 1999 at 08:33:22PM +0200, Carlos Costa Portela wrote:
> Not only there:
>
> aragorn[~/programas/timeout]% uname -a
> Linux aragorn 2.0.35 #1 sáb oct 10 13:02:33 CEST 1998 i686 unknown
> aragorn[~/programas/timeout]% ./ptime 0 1000
> tv_sec = 0, tv_usec = 1000
> tv_sec = 0, tv_usec = 0
> aragorn[~/programas/timeout]% ./ptime 1 0
> tv_sec = 1, tv_usec = 0
> tv_sec = 0, tv_usec = 0
> aragorn[~/programas/timeout]% ./ptime 2 0
> tv_sec = 2, tv_usec = 0
> tv_sec = 0, tv_usec = 0

the box that started doing this only did after some 250 days of uptime.

it turns out that the problem was already known (Ville Herva found and
diagnosed it a month or so ago), and occurs when jiffies wraps around
the 2^31 limit. see:

http://www.linuxhq.com/lnxlists/linux-kernel/lk_9904_04/msg00740.html
http://www.linuxhq.com/lnxlists/linux-kernel/lk_9904_04/msg00764.html

-- 
Roger Espel Llima, espel@llaic.u-clermont1.fr
http://www.eleves.ens.fr:8080/home/espel/index.html


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