On Fri, 10 Apr 2020 at 03:45, Johannes Fassotte
<johan...@automationassist.com> wrote:
>
> I don’t know. This is not something that I have looked into.
...
> I’m I thinking wrong?  Convert some to kernel modules like in OpenCN?

This is actually the cause of the problem. (though calling it a
problem is not really correct)
At least with RTAI all of the realtime code already runs as kernel modules.

The realtime code needs to have a non-empty queue to continue to
execute in realtime, it can't afford to wait for input from
user-space.

But, sometimes the realtime code needs to wait for input from
userspace. At which point there needs to be a handshake.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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