Function mpi::ffi::PMPI_File_iread_at

pub unsafe extern fn PMPI_File_iread_at(fh: MPI_File,
                                        offset: MPI_Offset,
                                        buf: *mut c_void,
                                        count: c_int,
                                        datatype: MPI_Datatype,
                                        request: *mut MPI_Request)
                                        -> c_int