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