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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--             A D A . S Y N C H R O N O U S _ B A R R I E R S              --

--                                                                          --

--                                  S p e c                                 --

--                                                                          --

--          Copyright (C) 1992-2011, 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 is the spec of this package using POSIX barriers

with System;

private with Ada.Finalization;

private with Interfaces.C;

package Ada.Synchronous_Barriers is

   pragma Preelaborate (Synchronous_Barriers);

   subtype Barrier_Limit is Positive range 1 .. Positive'Last;

   type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is

      limited private;

   procedure Wait_For_Release

     (The_Barrier : in out Synchronous_Barrier;

      Notified    : out Boolean);

private

   --  POSIX barrier data type

   SIZEOF_PTHREAD_BARRIER_T : constant :=

     (if System.Word_Size = 64 then 32 else 20);

   --  Value defined according to the linux definition in pthreadtypes.h. On

   --  other system, e.g. MIPS IRIX, the object is smaller, so it works

   --  correctly although we are wasting some space.

   type pthread_barrier_t_view is (size_based, align_based);

   type pthread_barrier_t (Kind : pthread_barrier_t_view := size_based) is

      record

         case Kind is

            when size_based =>

               size : Interfaces.C.char_array (1 .. SIZEOF_PTHREAD_BARRIER_T);

            when align_based =>

               align : Interfaces.C.long;

         end case;

      end record;

   pragma Unchecked_Union (pthread_barrier_t);

   type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is

     new Ada.Finalization.Limited_Controlled with

        record

           POSIX_Barrier : aliased pthread_barrier_t;

        end record;

   overriding procedure Initialize (Barrier : in out Synchronous_Barrier);

   overriding procedure Finalize   (Barrier : in out Synchronous_Barrier);

end Ada.Synchronous_Barriers;