[Libvir] Remote & the problem with qemu deadlock
Daniel Veillard
veillard at redhat.com
Wed Apr 18 16:57:55 UTC 2007
On Wed, Apr 18, 2007 at 04:33:58PM +0100, Richard W.M. Jones wrote:
> Daniel Veillard wrote:
> > Can we recognize that the connection is on localhost and just serve
> >the request directly and synchronously instead ?
>
> Yes you can. In real terms what this would mean is that all the
> functions in qemu_internal.c are changed so that they become:
>
> static int qemuDestroyDomain(virDomainPtr domain) {
> qemud_packet_client req;
> qemud_packet_server reply;
> qemuPrivatePtr priv = (qemuPrivatePtr) domain->conn->privateData;
>
> req.data.type = QEMUD_CLIENT_PKT_DOMAIN_DESTROY;
> req.data.qemud_packet_client_data_u.domainDestroyRequest.id =
> domain->id;
>
> #if QEMU_INTERNAL_IS_REALLY_LINKED_TO_THE_SERVER
> /* some code to get the fake server & client, and then: */
> qemudDispatchDomainDestroy (server, client, req, rep);
> /* followed by some code to decode the fake "reply packet" */
> #else /* existing code: */
> if (qemuProcessRequest(domain->conn, priv->qemud_fd, NULL, &req,
> &reply) < 0) {
> return -1;
> }
>
> return 0;
> #endif
> }
>
> So it can be done but qemu_internal is sure going to look ugly afterwards.
Maybe you can centralize the dispatcher one level up and keep it like
a driver, this could avoid the issue, no ?
Daniel
--
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Daniel Veillard | virtualization library http://libvirt.org/
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