Function mpi::ffi::MPI_Reduce_scatter_block

pub unsafe extern fn MPI_Reduce_scatter_block(sendbuf: *const c_void,
                                              recvbuf: *mut c_void,
                                              recvcount: c_int,
                                              datatype: MPI_Datatype,
                                              op: MPI_Op,
                                              comm: MPI_Comm)
                                              -> c_int