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106 | ------------------------------------------------------------------------------
-- --
-- GLADE EXAMPLES --
-- --
-- C O N T R O L L E R --
-- --
-- B o d y --
-- --
-- Copyright (C) 1996-2006 Free Software Foundation, Inc. --
-- --
-- GLADE is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 2, or (at your option) any later --
-- version. GLADE is distributed in the hope that it will be useful, but --
-- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABI- --
-- LITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public --
-- License for more details. You should have received a copy of the GNU --
-- General Public License distributed with GLADE; see file COPYING. If --
-- not, write to the Free Software Foundation, 59 Temple Place - Suite 330, --
-- Boston, MA 02111-1307, USA. --
-- --
-- GLADE is maintained by ACT Europe. --
-- (email:distribution@act-europe.gnat.com). --
-- --
------------------------------------------------------------------------------
with Ada.Text_IO;
with Ada.Integer_Text_IO;
package body Controller is
Max_Workers : Integer := 10;
type Worker_Table is array (1 .. Max_Workers) of Worker_Access;
protected Keeper is
entry Get (W : out Worker_Access);
entry Put (W : in Worker_Access);
entry Lock;
procedure Unlock;
private
Count : Integer := 0;
Table : Worker_Table := (others => null);
Locked : Boolean := False;
end Keeper;
protected body Keeper is
entry Lock when not Locked is
begin
Locked := True;
end Lock;
procedure Unlock is
begin
Locked := False;
end Unlock;
entry Get (W : out Worker_Access) when Count > 0 is
begin
for Index in Table'Range loop
if Table (Index) /= null then
W := Table (Index);
Table (Index) := null;
Count := Count - 1;
exit;
end if;
end loop;
end;
entry Put (W : in Worker_Access) when Count < Max_Workers is
begin
for Index in Table'Range loop
if Table (Index) = null then
Count := Count + 1;
Table (Index) := W;
exit;
end if;
end loop;
end;
end Keeper;
procedure Register (W : Worker_Access) is
begin
Keeper.Put (W);
end Register;
function Get_Worker return Worker_Access is
W : Worker_Access;
begin
Keeper.Get (W);
return W;
end Get_Worker;
procedure Get_Integer (Message : String; Value : out Integer) is
begin
Keeper.Lock;
Ada.Text_IO.Put (Message);
Ada.Integer_Text_IO.Get (Value);
Keeper.Unlock;
end Get_Integer;
procedure Done (Message : String) is
begin
Ada.Text_IO.Put ("done : ");
Ada.Text_IO.Put_Line (Message);
end Done;
end Controller;
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