------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--         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          --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
--                                                                          --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the  contents of the part following the private keyword. --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
--                                                                          --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

--  This file has been modified from the GCC 4.9.1 version for the
--  Cortex GNAT RTS project.

package Ada.Synchronous_Task_Control is
   pragma Preelaborate;
   --  In accordance with Ada 2005 AI-362

   type Suspension_Object is limited private;

   procedure Set_True (S : in out Suspension_Object);

   procedure Set_False (S : in out Suspension_Object);

   function Current_State (S : Suspension_Object) return Boolean;

   procedure Suspend_Until_True (S : in out Suspension_Object);

private

   protected type Suspension_Object is
      procedure Set_True;
      procedure Set_False;
      function Current_State return Boolean;
      entry Suspend_Until_True;
   private
      State : Boolean := False;
   end Suspension_Object;

   --  Note: ARM D.10(10) requires PE to be raised if a task calls
   --  Suspend_Until_True on an SO while another task is already
   --  waiting on that SO. No special action here; such a call is
   --  forbidden by Ravenscar, and will raise PE with "entry call
   --  already queued".

end Ada.Synchronous_Task_Control;
