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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --         A D A . S Y N C H R O N O U S _ T A S K _ C O N T R O L          --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2008, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the  contents of the part following the private keyword. --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  21 -- for  more details.  You should have  received  a copy of the GNU General --
  22 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  23 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  24 -- Boston, MA 02110-1301, USA.                                              --
  25 --                                                                          --
  26 -- As a special exception,  if other files  instantiate  generics from this --
  27 -- unit, or you link  this unit with other files  to produce an executable, --
  28 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  29 -- covered  by the  GNU  General  Public  License.  This exception does not --
  30 -- however invalidate  any other reasons why  the executable file  might be --
  31 -- covered by the  GNU Public License.                                      --
  32 --                                                                          --
  33 -- GNAT was originally developed  by the GNAT team at  New York University. --
  34 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 with System.Task_Primitives;
  39
  40 with Ada.Finalization;
  41
  42 package Ada.Synchronous_Task_Control is
  43    pragma Preelaborate_05;
  44    --  In accordance with Ada 2005 AI-362
  45
  46    type Suspension_Object is limited private;
  47
  48    procedure Set_True (S : in out Suspension_Object);
  49
  50    procedure Set_False (S : in out Suspension_Object);
  51
  52    function Current_State (S : Suspension_Object) return Boolean;
  53
  54    procedure Suspend_Until_True (S : in out Suspension_Object);
  55
  56 private
  57
  58    procedure Initialize (S : in out Suspension_Object);
  59    --  Initialization for Suspension_Object
  60
  61    procedure Finalize (S : in out Suspension_Object);
  62    --  Finalization for Suspension_Object
  63
  64    type Suspension_Object is
  65      new Ada.Finalization.Limited_Controlled with
  66    record
  67       SO : System.Task_Primitives.Suspension_Object;
  68       --  Use low-level suspension objects so that the synchronization
  69       --  functionality provided by this object can be achieved using
  70       --  efficient operating system primitives.
  71    end record;
  72
  73    pragma Inline (Set_True);
  74    pragma Inline (Set_False);
  75    pragma Inline (Current_State);
  76    pragma Inline (Suspend_Until_True);
  77    pragma Inline (Initialize);
  78    pragma Inline (Finalize);
  79
  80 end Ada.Synchronous_Task_Control;