On Sat, 2 May 2009, Mulyadi Santosa wrote:
> On Fri, May 1, 2009 at 6:14 PM, Robert P. J. Day <[email protected]>
> wrote:
> >
> > (from now on, i'll use "ELDD" to refer to the book "essential linux
> > device drivers.")
> >
> > on p. 34 of ELDD, we see an example of using schedule_timeout():
> >
> > unsigned long timeout = jiffies + HZ;
> > schedule_timeout(timeout);
> >
> > that doesn't look right, does it? i thought schedule_timeout() took,
> > as an arg, the number of clock ticks to wait. what the above is doing
> > is calculating an actual *time* in the future, "jiffies + HZ"
> > representing the time (in jiffies) one second from now.
> >
> > or am i misreading something?
>
> Uhum, I agree with you Robert. schedule_timeout() should take its
> parameter as sleep interval, not the when it should be awaken.
thought so -- already submitted an errata report for that.
rday
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Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Annoying Kernel Pedantry.
Web page: http://crashcourse.ca
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