> Is it possible to create a new process which shares the data with the
> parent?
>
> (For example to use two processors in the same programm)
Yes. You should use LinuxThreads[1] which are kernel-pthreads. They are
able to share the same address space but are scheduled like a real
process (in fact, those threads are created with the shadow system
call clone() which creates, AFAIK, a duplicate of a process sharing
the same address space).
[1] http://pauillac.inria.fr/~xleroy/linuxthreads/
-- David Mentr\'e / CERSIAT-BAE / Sys admin <mailto:David.Mentre@seriat.fr>