Looking for xshmfence example code

[Clemens Eisserer]

Hi,

I would like to use XShmPutImage to upload streaming data to Pixmaps,
however the XSHM extension lacks, as far as I can see, the ability to
notify the client when the actual ShmPut-request has been processed
and the client can start modifying a shared memory segment again.

Is xshmfence what I am looking for?

If so, are there any self-contained examples how to use it?
Google wasn't helpful in finding something...

Thanks & best regards, Clemens