Genode region mapper

[Norman Feske]

Hi Valery,

> So yes, I could be able to create the shared memory area as a single
> managed dataspace in os2exec, and
> pass it to each userland process, at its initialization. Also, reserved
> sub-regions could also be
> implemented as managed dataspaces, which will go into needed (private or
> shared) areas.

thanks for the detailed background information. This makes the picture
much more clear.

To work around the limitation of base-linux, I recommend to let each
process create its shared and private areas as managed dataspaces and
actively pull their respective content from the os2exec server. The
os2exec server would provide a session interface that allows each client
to obtain the individual regions of those areas. So it is the job of
each process to attach the individual dataspaces to its locally created
managed dataspaces. The managed dataspaces are never shared across
component boundaries.

Of course, you cannot enforce the consistency of the 'shared' area
across all processes this way. Each process must adhere the protocol.
But I guess it would be in the best interest of each process to do so,
wouldn't it?

Happy hacking!
Norman

-- 
Dr.-Ing. Norman Feske
Genode Labs

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