Re: port-xen/50659: Xen4.5 crash with vnds

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Mar 24, 2016 at 10:22:36PM +0100, Christoph Badura wrote:
> On Thu, Mar 24, 2016 at 09:38:06PM +0100, Manuel Bouyer wrote:
> > > If you looks at the linux hotplug scripts, they do their own serialization
> > > as appropriate.  "grep -r _lock hotplug/Linux".
> > 
> > I tried to do something with shlock(1) but it doens't work, it's too
> > slow and xl times out. 
> > Maybe flock would work but older NetBSD don't have it ...
> 
> I noticed that you said before that shlock was too slow.  I'm surprised.
> The linux claim_lock functions calls out to perl...

the problem is that shlock can't wait on the lock by itself.
If it fail you have to retry, and in sh I didn't find a way to sleep
for less than 1s before retry (or you could busy-wait but I'm not sure
it's better).

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--