RtFiFo s are quite good for many purposes, .... but why not extend them to:
1) be bi directional, having two buffers one for sys->usr and one
for usr->sys direction?
2) make a mmap call to them to have shared memory for the process
and the fifo s to sync usr and sys access. One could even use the
rt_fifo_handler to do this soft interrupt thing. ??
This would keep the application code nice and clean using one
interface between user and kernel part.
Jens Michaelsen
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