AndroitShmem is a shared memory service for Androit. Androit itself is an
effort to make the Android operating system real-time capable and fulfil
industrial needs in terms of usability and determinism.

For further details, refer to "M. Damschen: Concurrent shared memory access for
Android applications and real-time processes", 2012 (Bachelor_thesis.pdf).
There, possible synchronisation techniques for AndroitShmem are discussed in
detail.