Function mpi::ffi::PMPI_Reduce_scatter_block

pub unsafe extern fn PMPI_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