Function mpi::ffi::PMPI_File_iwrite_at_all

pub unsafe extern "C" fn PMPI_File_iwrite_at_all(
    fh: *mut ompi_file_t,
    offset: i64,
    buf: *const c_void,
    count: i32,
    datatype: *mut ompi_datatype_t,
    request: *mut *mut ompi_request_t
) -> i32