Subject: Re: port-xen/29999: ctrl_if_interrupt IPL problem
To: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
From: Manuel Bouyer <bouyer@antioche.lip6.fr>
List: netbsd-bugs
Date: 04/19/2005 12:51:17
On Tue, Apr 19, 2005 at 11:43:04AM +0100, Christian Limpach wrote:
> From: "Manuel Bouyer" <bouyer@antioche.lip6.fr>
> >Hum, I need to look at this again. From what I remember, if I leaved
> >the events blocked, HYPERVISOR_yield() would never return.
> >But maybe I had something else wrong in my code.
> 
> HYPERVISOR_yield() should be used to yield the cpu, i.e. other domains will 
> get to run and the current domain gets put on the runqueue and will run 
> again at some point.  HYPERVISOR_block() will also yield the cpu but only 
> returns once there's an event that can be delivered.

Will HYPERVISOR_block() return when there is an event pending, even if
evtchn_upcall_mask is nonzero ?

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
     NetBSD: 26 ans d'experience feront toujours la difference
--