1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- A D A . S Y N C H R O N O U S _ B A R R I E R S -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2011, 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 3, 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. -- 21-- -- 22-- As a special exception under Section 7 of GPL version 3, you are granted -- 23-- additional permissions described in the GCC Runtime Library Exception, -- 24-- version 3.1, as published by the Free Software Foundation. -- 25-- -- 26-- You should have received a copy of the GNU General Public License and -- 27-- a copy of the GCC Runtime Library Exception along with this program; -- 28-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 29-- <http://www.gnu.org/licenses/>. -- 30-- -- 31-- GNAT was originally developed by the GNAT team at New York University. -- 32-- Extensive contributions were provided by Ada Core Technologies Inc. -- 33-- -- 34------------------------------------------------------------------------------ 35 36-- This is the spec of this package using POSIX barriers 37 38with System; 39private with Ada.Finalization; 40private with Interfaces.C; 41 42package Ada.Synchronous_Barriers is 43 pragma Preelaborate (Synchronous_Barriers); 44 45 subtype Barrier_Limit is Positive range 1 .. Positive'Last; 46 47 type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is 48 limited private; 49 50 procedure Wait_For_Release 51 (The_Barrier : in out Synchronous_Barrier; 52 Notified : out Boolean); 53 54private 55 -- POSIX barrier data type 56 57 SIZEOF_PTHREAD_BARRIER_T : constant := 58 (if System.Word_Size = 64 then 32 else 20); 59 -- Value defined according to the linux definition in pthreadtypes.h. On 60 -- other system, e.g. MIPS IRIX, the object is smaller, so it works 61 -- correctly although we are wasting some space. 62 63 type pthread_barrier_t_view is (size_based, align_based); 64 65 type pthread_barrier_t (Kind : pthread_barrier_t_view := size_based) is 66 record 67 case Kind is 68 when size_based => 69 size : Interfaces.C.char_array (1 .. SIZEOF_PTHREAD_BARRIER_T); 70 when align_based => 71 align : Interfaces.C.long; 72 end case; 73 end record; 74 pragma Unchecked_Union (pthread_barrier_t); 75 76 type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is 77 new Ada.Finalization.Limited_Controlled with 78 record 79 POSIX_Barrier : aliased pthread_barrier_t; 80 end record; 81 82 overriding procedure Initialize (Barrier : in out Synchronous_Barrier); 83 overriding procedure Finalize (Barrier : in out Synchronous_Barrier); 84end Ada.Synchronous_Barriers; 85