gtk-vnc widget stops drawing...

[Rob Stoddard <rstoddard telanetix com>]

I have been working with the GTK-VNC widget for quite some time.   It 
turns out that the way it does threading is really not good at all;  it 
locks all threads from running except one.  It switches "context" via a 
yield function call.  When there's a lengthy update, it freezes the 
video conference application that I have worked very hard to have 
operating smoothly without glitches or freezeups.
So, I decided I would rework the entire threading mechanism in the 
widget.  I would make it run smoothly.    I have succeeded in that, 
except for one little problem.   After a while, the widget just stops 
drawing.  The thread isn't locking up, its as if when I call 
gtk_widget_queue_draw()   it doesn't queue up the draw.  The expose 
event function call is never called.  Sometimes the widget works really 
well for almost a whole minute, then stops.  Sometimes its after a ten 
or fifteen seconds.   There seems to be no real trigger that causes it 
to happen.
Anybody have any clues they can toss me regarding anything that would 
cause a widget to stop drawing or stop responding to functions such as 
gtk_widget_queue_draw()  ?        May I reiterate, the thread is not 
locking up; it is still getting all the other events (key,  mouse moved, 
etc.)

Thanks for your help,

Rob Stoddard