[libvirt] callback question
?Hi, Something I need to understant about callbacks: if I install 2 callback via DomainEventRegisterAny (lifecycle for the first and graphics for the second for example), am I right if I said that the AddHandleFunc should be called 2 times ? Regards, Arnaud
On Mon, Jan 31, 2011 at 12:16:24PM +0100, arnaud.champion@devatom.fr wrote:
?Hi,
Something I need to understant about callbacks:
if I install 2 callback via DomainEventRegisterAny (lifecycle for the first and graphics for the second for example), am I right if I said that the AddHandleFunc should be called 2 times ?
No, there is no direct relationship between the number of calls to DomainEventRegister* and AddHandleFunc. In the current impl we only call AddHandleFunc once per virConnect object, but again that isn't guarenteed - different libvirt drivers will invoke AddHandleFunc / AddTimeoutFunc a different number of times, as is most suitable for their precise needs. Daniel
Okay, I understand. When the AddHandle function, I receive a fd (FileDescription), its value is 3... always... Is that normal ? Is that file descriptor on a socket or on a file ? (In windows, when can use the WSAPoll function but it works on ly on sockets) Regards, Arnaud -------------------------------------------------- From: "Daniel P. Berrange" <berrange@redhat.com> Sent: Monday, January 31, 2011 12:43 PM To: <arnaud.champion@devatom.fr> Cc: <libvir-list@redhat.com> Subject: Re: [libvirt] callback question
On Mon, Jan 31, 2011 at 12:16:24PM +0100, arnaud.champion@devatom.fr wrote:
?Hi,
Something I need to understant about callbacks:
if I install 2 callback via DomainEventRegisterAny (lifecycle for the first and graphics for the second for example), am I right if I said that the AddHandleFunc should be called 2 times ?
No, there is no direct relationship between the number of calls to DomainEventRegister* and AddHandleFunc. In the current impl we only call AddHandleFunc once per virConnect object, but again that isn't guarenteed - different libvirt drivers will invoke AddHandleFunc / AddTimeoutFunc a different number of times, as is most suitable for their precise needs.
Daniel
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arnaud.champion＠devatom.fr -
Daniel P. Berrange