Queue (Using Tasking), Ada

Queue (Using Tasking)

--GNAT 4.9.3

with Ada.Text_IO; use Ada.Text_IO;
with ada.exceptions;

procedure Hello is
    task type queue(len : integer) is 
        entry push(num : integer);
        entry pop(num : out integer);
    end queue;
    
    task body queue is
        data : array(1..len) of integer;
        idx, idx1 : integer := 0;
        queue_full, queue_empty : exception;
    begin
        loop
            select
                accept push(num : integer) do
                    idx := idx + 1;
                     data(idx) := num;
                exception
                    when e : constraint_error =>
                        raise queue_full with ada.exceptions.exception_message(e);
                end push;
            or
                accept pop(num : out integer) do
                    idx1 := idx1 + 1;
                    num := data(idx1);
                exception
                    when e : constraint_error =>
                        raise queue_empty with ada.exceptions.exception_message(e);
                end pop;
            or
                terminate;
            end select;
        end loop;
    end queue;
    
    myq : queue(10);
    num : integer;
begin
    for i in 1..myq.len loop
      myq.push(i);
    end loop;
    
    for i in 1..myq.len loop
      myq.pop(num);
      Put_Line (num'img);
   end loop;
end Hello;


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