I'd go with something like this : A cursor to select the rows in order for update, and use the LIMIT clause to get the first ten available.

create table gm_temp
as select rownum id, table_name obj_name, date '2011-01-01' + rownum create_date 
from all_tables where rownum < 500;

CREATE TYPE tab_number IS TABLE OF NUMBER;

DECLARE
  cursor c_table IS 
    SELECT id FROM gm_temp ORDER BY create_date DESC FOR UPDATE OF id SKIP LOCKED;
  t_table_src tab_number := tab_number();
BEGIN
  OPEN c_table;
  FETCH c_table BULK COLLECT INTO t_table_src LIMIT 10;
  CLOSE c_table;
  dbms_output.put_line(':'||t_table_src.count||':'||t_table_src(1));
END;

Actually, I'd firstly see whether processing ALL outstanding rows as a set would be better than multi-threading.

Then if I did decide that I needed some form of multi-threading, I'd look at pipelined functions with parallel enabled (assuming I was on Enterprise Edition).