shared memory trigger

[mquezada nlxcorp com]

I have a GTK gui tool that monitors values in shared memory of a real time
control application. This application runs at a rate of 60 Hz and we have a
shared memory value that counts the frames. Id like the GUI to refresh at a
user specified rate between 1 and 60 as indicated by the frame counter
value. Rather than using a timeout function which can fall out of synch, is
there a way to add an I/O channel that will trigger a callback every time
the value in shared memory is updated?

I'm currently using the latest GTK 1.2.

Thanks.

Marco Quezada
Aerospaceo Engineero
NLX Corporation
22626 Sally Ride Dr.
Sterling, VA, 20164
703-234-2100  ext. 1028