[Xcb] magical callback funness

[Jeremy Kolb]

I've run into a snag with record.  It there's a request/reply called 
RecordGetContext.  This gets the events recorded on the current 
connection.  However when calling the reply it enters a loop and prints 
out how no record was found for such and such an event.  The problem is 
that I can't get out of this loop to do other things like parse the 
information and what not.

Xlib seems to solve this problem by installing a callback (I'm not 
really sure how it works though). when enabling the context 
(RecordEnableContext).

I'm not sure how to solve this.  Ideas, suggestions?

Jeremy