- UPstream::Communicator is similar to UPstream::Request to
wrap/unwrap MPI_Comm. Provides a 'lookup' method to transcribe
the internal OpenFOAM communicator tracking to the opaque wrapped
version.
- provide an 'openfoam_mpi.H' interfacing file, which includes
the <mpi.h> as well as casting routines.
Example (caution: ugly!)
MPI_Comm myComm =
PstreamUtils::Cast::to_mpi
(
UPstream::Communicator::lookup(UPstream::worldComm)
);
- waits for completion of any of the listed requests and returns the
corresponding index into the list.
This allows, for example, dispatching of data when the receive is
completed.
