Function PMPI_Ireduce

pub unsafe extern "C" 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