Re: [Xen-devel] [PATCH 0 of 3] xl and hotplug: Introduce and use shutdown and reboot xm compatibility options

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("Re: [PATCH 0 of 3] xl and hotplug: Introduce and use 
shutdown and reboot xm compatibility options"):
> On Tue, 2012-09-25 at 16:11 +0100, Sander Eikelenboom wrote:
> > The only relative simple implementation i thought of was direct
> > shutting down all, and when the -w parameter was set, just loop and
> > wait on events until the only running domain is domain-0.
> > Although this exactly does what has to be done, it somehow sounds a
> > bit dirty.
> 
> I think you can allocate an array of libxl_evenable_domain_death*, of
> nr_doms in size and then as you shutdown each domain call
> libxl_evenable_domain_death for it too.

Yes.

> Then you loop waiting for destroy events, calling
> libxl_evdisable_domain_death as each domain dies, while counting back
> from nr_doms until 0. When it reaches 0 everything you asked for has
> been shutdown.

You can do the disable any time later; leaving it lying around is
harmless (although it may leak some memory).

Ian.

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