Re: [libvirt] [PATCH 2/8] Basic framework for lock manager plugins
On Tue, Nov 30, 2010 at 10:20:38AM +0000, Daniel P. Berrange wrote:
The AttachObject/DetachObject calls are made by libvirtd, whenever
it is about todo something on behalf of the managed object holding
the lock. eg when libvirtd does disk hotplug it will do
$man = NewObject()
AttachObject($man, $QEMUPID);
AcquireResource($man, $newdiskpath);
DetachObject($man);
FreeObject($man)
So basically the AttachObject call is telling the lock manager
plugin what $PID the following AcquireResource operation needs
to be applied to. Chances are your DetachObject call will only
need to be a no-op but I put the hook in just in case there's
a need for it
OK, it seems a roundabout way of SetParameter($man, "pid", $QEMUPID),
but "just in case ..." seems to be the consistent approach here.
Dave