Re: [Qemu-devel] [PATCH 0/2]: qemu-ga: make shutdown & suspend synchronous

[Michal Privoznik]

On 11.05.2012 21:19, Luiz Capitulino wrote:
> The main motivation for this series is fixing two possible race conditions
> in the guest-suspend-* API due to the complexity that arose from the way
> we handle terminated children processes today. Full details in the first
> patch.
> 
> This series applies on top of my two other qemu-ga series submitted
> previously:
> 
>  http://lists.gnu.org/archive/html/qemu-devel/2012-05/msg00999.html
> 
>  http://lists.gnu.org/archive/html/qemu-devel/2012-05/msg01507.html
> 
>  qapi-schema-guest.json   |   56 ++++++++++------
>  qapi/qmp-core.h          |   10 ++-
>  qapi/qmp-dispatch.c      |    8 ++-
>  qapi/qmp-registry.c      |    4 +-
>  qemu-ga.c                |   40 ++++++------
>  qga/commands-posix.c     |  162 
> ++++++++++++++++++----------------------------
>  qga/guest-agent-core.h   |    4 ++
>  scripts/qapi-commands.py |   14 +++-
>  8 files changed, 154 insertions(+), 144 deletions(-)
> 

Okay, this is definitely an enhancement and fix of bogus implementation.
One thing that I'd like to ask is - how can user distinguish between
these implementations. I am asking basically from libvirt POV.
Because if I assume I am dealing with the previous implementation and
thus waiting for the {'return':{}} before I can return form an API, but
the GA actually uses the new implementation I will block endlessly.

Thanks,

Michal