On Fri, 2007-01-26 at 09:00 +0100, Peter Zijlstra wrote:
> On Thu, 2007-01-25 at 21:02 -0800, Andrew Morton wrote:
> > On Thu, 25 Jan 2007 16:32:28 +0100
> > Peter Zijlstra <[email protected]> wrote:
> >
> > > +long congestion_wait_interruptible(int rw, long timeout)
> > > +{
> > > + long ret;
> > > + DEFINE_WAIT(wait);
> > > + wait_queue_head_t *wqh = &congestion_wqh[rw];
> > > +
> > > + prepare_to_wait(wqh, &wait, TASK_INTERRUPTIBLE);
> > > + if (signal_pending(current))
> > > + ret = -ERESTARTSYS;
> > > + else
> > > + ret = io_schedule_timeout(timeout);
> > > + finish_wait(wqh, &wait);
> > > + return ret;
> > > +}
> > > +EXPORT_SYMBOL(congestion_wait_interruptible);
> >
> > I think this can share code with congestion_wait()?
> >
> > static long __congestion_wait(int rw, long timeout, int state)
> > {
> > long ret;
> > DEFINE_WAIT(wait);
> > wait_queue_head_t *wqh = &congestion_wqh[rw];
> >
> > prepare_to_wait(wqh, &wait, state);
> > ret = io_schedule_timeout(timeout);
> > finish_wait(wqh, &wait);
> > return ret;
> > }
> >
> > long congestion_wait_interruptible(int rw, long timeout)
> > {
> > long ret = __congestion_wait(rw, timeout);
> >
> > if (signal_pending(current))
> > ret = -ERESTARTSYS;
> > return ret;
> > }
> >
> > it's only infinitesimally less efficient..
>
> All the other _interruptible functions check signal_pending before
> calling schedule. Which seems to make sense since its called in a loop
> anyway, and if the loop condition turns false when interrupted you might
> as well just finish up instead of bailing out.
>
> However if you'd rather see your version, who am I to object ;-)
ok, first wake up, then reply to emails :-)
How about this:
long congestion_wait_interruptible(int rw, long timeout)
{
long ret;
if (signal_pending(current))
ret = -ERESTARTSYS;
else
ret = congestion_wait(rw, timeout);
return ret;
}
EXPORT_SYMBOL(congestion_wait_interruptible);
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