Function mpi::ffi::MPI_Neighbor_alltoall

pub unsafe extern fn MPI_Neighbor_alltoall(sendbuf: *const c_void,
                                           sendcount: c_int,
                                           sendtype: MPI_Datatype,
                                           recvbuf: *mut c_void,
                                           recvcount: c_int,
                                           recvtype: MPI_Datatype,
                                           comm: MPI_Comm)
                                           -> c_int