85 lines
4.2 KiB
Ada
85 lines
4.2 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . S Y N C H R O N O U S _ B A R R I E R S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the contents of the part following the private keyword. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the spec of this package using POSIX barriers
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with System;
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private with Ada.Finalization;
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private with Interfaces.C;
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package Ada.Synchronous_Barriers is
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pragma Preelaborate (Synchronous_Barriers);
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subtype Barrier_Limit is Positive range 1 .. Positive'Last;
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type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is
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limited private;
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procedure Wait_For_Release
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(The_Barrier : in out Synchronous_Barrier;
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Notified : out Boolean);
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private
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-- POSIX barrier data type
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SIZEOF_PTHREAD_BARRIER_T : constant :=
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(if System.Word_Size = 64 then 32 else 20);
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-- Value defined according to the linux definition in pthreadtypes.h. On
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-- other system, e.g. MIPS IRIX, the object is smaller, so it works
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-- correctly although we are wasting some space.
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type pthread_barrier_t_view is (size_based, align_based);
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type pthread_barrier_t (Kind : pthread_barrier_t_view := size_based) is
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record
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case Kind is
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when size_based =>
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size : Interfaces.C.char_array (1 .. SIZEOF_PTHREAD_BARRIER_T);
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when align_based =>
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align : Interfaces.C.long;
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end case;
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end record;
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pragma Unchecked_Union (pthread_barrier_t);
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type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is
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new Ada.Finalization.Limited_Controlled with
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record
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POSIX_Barrier : aliased pthread_barrier_t;
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end record;
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overriding procedure Initialize (Barrier : in out Synchronous_Barrier);
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overriding procedure Finalize (Barrier : in out Synchronous_Barrier);
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end Ada.Synchronous_Barriers;
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