On 12/13/2011 05:38 PM, Daniel P. Berrange wrote:
From: "Daniel P. Berrange" <berrange@redhat.com>
The lifetime of the virDomainEventState object is tied to the lifetime of the driver, which in stateless drivers is tied to the lifetime of the virConnectPtr.
If we add & remove a timer when allocating/freeing the virDomainEventState object, we can get a situation where the timer still triggers once after virDomainEventState has been freed. The timeout callback can't keep a ref on the event state though, since that would be a circular reference.
The trick is to only register the timer when a callback is registered with the event state & remove the timer when the callback is unregistered.
ACK. -- Eric Blake eblake@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org