| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-2021, 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 with SPARK_Mode => Off 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; |
