gcc/ada/a-sytaco-vxworks.ads

   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) 1992-2001 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,  59 Temple Place - Suite 330,  Boston, --
  24 -- MA 02111-1307, 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.OS_Interface;
  39 with Ada.Finalization;
  40 package Ada.Synchronous_Task_Control is
  41
  42    type Suspension_Object is limited private;
  43
  44    procedure Set_True (S : in out Suspension_Object);
  45
  46    procedure Set_False (S : in out Suspension_Object);
  47
  48    function Current_State (S : Suspension_Object) return Boolean;
  49
  50    procedure Suspend_Until_True (S : in out Suspension_Object);
  51
  52 private
  53
  54    procedure Initialize (S : in out Suspension_Object);
  55
  56    procedure Finalize (S : in out Suspension_Object);
  57
  58    --  Implement with a VxWorks binary semaphore. A second semaphore
  59    --  is used to avoid a race condition related to the implementation of
  60    --  the STC requirement to raise Program_Error when Suspend_Until_True is
  61    --  called with a task already pending on the suspension object
  62
  63    type Suspension_Object is new Ada.Finalization.Controlled with record
  64       Sema  : System.OS_Interface.SEM_ID;
  65       Mutex : System.OS_Interface.SEM_ID;
  66    end record;
  67
  68 end Ada.Synchronous_Task_Control;