Hi,
I think shared memory is rarely needed. Fifos as programmed by Michael
are already very effective. However they can suffer from limited buffer
size and by the rtl_tq running only when the scheduler is run.
The latter point is for a matter of dispute with the friends at NMT, but
is going unheard.
The limitation of the buffer size can be easily solved by modifying
rtf_create so that the buffer is assigned statically at module load by
the user in kernel space, without any limitation. I'm using routinely 10
Mb on a 64 Mb ram, without any problem.
With such a buffer even the glitches in scheduling fifo reading/writing
processes can often be easily absorbed. There is the slight disadvantage
of a double memory copy that, with today computer power, is not
significant.
There is on the contrary a big advantage in using fifos, any
sinchronization problem is already solved, Linux processes can sleep or
poll as you like.
Ciao, Paolo.
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