[Qemu-devel] Re: [PATCH v7 4/6] char: Add qemu_chr_write_nb() for nonblocking writes

[Anthony Liguori]

On 05/05/2010 02:16 PM, Gerd Hoffmann wrote:
> On 05/05/10 20:49, Anthony Liguori wrote:
> > On 05/05/2010 01:43 PM, Gerd Hoffmann wrote:
> > > On 05/05/10 15:53, Anthony Liguori wrote:
> > > > This patch adds optional control flow in a pretty crufty way to *some*
> > > > backends but not all. This just adds a bunch of complexity that will
> > > > certainly introduce bugs.
> > >
> > > Amit plans to add support to the others as well. Beside that there is
> > > a clearly defined backup plan: In case the non-blocking interface
> > > isn't supported by $chardev it will fallback to use the blocking mode.
> >
> > If we have a second interface, we'll have two interfaces forever. I'd
> > rather see us aggressive remove the blocking interface instead of
> > introducing a second interface.
>
> I'm all for killing the blocking interface.  Problem is that 
> converting over all users isn't exactly trivial and we have plenty of 
> them.  IMHO it isn't realistic to do the switch with a single patch 
> series.

If we're agreed we ought to kill the blocking interface, let's define a 
new proper interface, rename all previous users to something ugly and 
deprecated, and approach it that way.

Let's make it clear what interfaces are supported and which interfaces 
are scheduled to be removed.

Regards,

Anthony Liguori

> cheers,
>   Gerd