plpgsql function with update and seeing changed data from outside during run

Hi,

I have a plpgsql function where I read data from a table in a loop and
update data in a different table.

Is it possible to see the updated data from a different access during
the run of this function? Or is this impossible because the function
is a "transaction" and no data change is visible outside until the
function is finished? I can see the changed data inside the function.

the function looks something like this

create or replace function insert_log(i_log_id INT, i_queue_id INT)
returns "varchar"
as $$
  declare
    [... here are record, etc declarations]
   begin
   for myrec in select * from queue where queue_id = i_queue_id;
   loop
      insert into log_sub () values ();
      update log set rows = [internal row count] where log_id = i_log_id;
   end loop
end; $$ language plpgsql;
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