Listing 7: Alternative to AQ 
create or replace function get_a_row return t%rowtype
as

    l_rec t%rowtype;
begin
    for x in ( select rowid rid from t <where> )
    loop

    begin
        select * into l_rec
          from t
         where rowid = x.rid
           FOR UPDATE NOWAIT;


        return l_rec;

    exception
        when others then NULL;
    end;

    end loop;
    return NULL;
end;