Function mpi::ffi::PMPI_Ireduce

pub unsafe extern fn PMPI_Ireduce(sendbuf: *const c_void,
                                  recvbuf: *mut c_void,
                                  count: c_int,
                                  datatype: MPI_Datatype,
                                  op: MPI_Op,
                                  root: c_int,
                                  comm: MPI_Comm,
                                  request: *mut MPI_Request)
                                  -> c_int