[Xcb] Event queue

[Michele Comignano]

During a my own project I needed to abstract xcb event handling adding event 
queue management. It has operations to push an event handler for a specific 
event type and remove them. After an event handlers are executed in order if 
any.  To do this I'm now using a default handler that in case of empty queue 
prints debug information or elsewhere execute the handlers in order.
I don't like how xcb-event behave now since make the program segfault when an 
event is not managed and I think this is not a good default behavior (may be 
I'm wrong, if so tell me why :)).

Anyway: an event queue is a good tool, and I want to know if could be an 
useful contribution to xcb-util.

-- 
Michele Comignano (comick)
Jabber: comick at autistici.org
Web: http://comick.playlinux.net