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Re: [libvirt] [PATCH] 514532 Fix man page, most operation are synchronous



On Thu, Nov 19, 2009 at 06:02:26PM +0100, Daniel Veillard wrote:
> On Thu, Nov 19, 2009 at 04:34:12PM +0000, Daniel P. Berrange wrote:
> > On Wed, Nov 18, 2009 at 02:31:12PM +0100, Daniel Veillard wrote:
> > >  
> > > -Most B<virsh> commands act asynchronously, so just because the B<virsh>
> > > -program returned, doesn't mean the action is complete.  This is
> > > -important, as many operations on domains, like create and shutdown,
> > > -can take considerable time (30 seconds or more) to bring the machine
> > > -into a fully compliant state.  If you want to know when one of these
> > > -actions has finished you must poll through virsh list periodically.
> > > +Most B<virsh> commands act synchronously, except maybe shutdown
> > > +and domain creation. In those case the fact that the B<virsh>
> > > +program returned, may not mean the action is complete and you
> > > +must poll through virsh list periodically to detect that the
> > > +operation completed.
> > 
> > Shutdown is async, but domain creation is certainly supposed to
> > be synchronous.    Of course the guest may immediately crash
> > so appear inactive again just after create returns
> 
> Well I was also thinking that Create like Shutdown, the process is at best
> started in the Domain OS but completion can't be asserted just because
> the command started. I think the idea of creating the guess is also
> implicitely tied with the OS booting th the mind of users, and well
> their domain won't respond to requests for a little bit even if the
> create succeeded.
> 
> > Thinking about it, I believe virDomainShutdown/Reboot, and the SetMemory
> > and SetVcpus are the only two APIs that are allowed to be async, because 
> > they merely update the guest, but don't wait for it to react.
> 

  Okay, fixed the pod accordingly and pushed,

   thanks !

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/


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