Re: [minios] Add xenbus shutdown control support

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Ian Campbell, le Tue 04 Dec 2012 09:32:45 +0000, a écrit :
> On Tue, 2012-12-04 at 00:30 +0000, Samuel Thibault wrote:
> > Ian Campbell, le Thu 29 Nov 2012 11:14:19 +0000, a écrit :
> > > On Wed, 2012-11-28 at 21:57 +0000, Samuel Thibault wrote:
> > > > Add a thread watching the xenbus shutdown control path and notifies a
> > > > wait queue.
> > > 
> > > Why a wait queue rather than a weak function call?
> > 
> > Because it integrates well with existing wait loops.
> 
> I was imagining that someone using such a wait loop would simply provide
> the weak function to kick the queue themselves,

Ah, right, in that case it doesn't need much synchronization with the
shutdown event, so it doesn't pose problem.

> rather than imposing this design on them from the core. It's not a big
> deal though.

But it's nicer to get it the way people would prefer. Daniel, Matthew,
what do you think?

Samuel