On 1999/Oct/20, Brian S. Julin wrote:
> Basically there are two situations to worry about. One is trying
> to find the ray position from userspace when the process is running.
> The other is trying to get the scheduler to run the process
> promptly at a certain ray positions.
I think there is an easy solution for the first thing. Why don't you
share a flag variable between the kernel and the process, that becomes 1 at
the vertical retrace and 0 when it finishes? It would be for programmers
even more efficient than reading from the IO port directly (which is
impossible under Linux, obviously). It could be managed in a similar way
than the graphics context, couldn't it?
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