Function mpi::ffi::PMPI_File_iwrite_at

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