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Diffstat (limited to 'gcc-4.9/gcc/ada/a-synbar-posix.ads')
| -rw-r--r-- | gcc-4.9/gcc/ada/a-synbar-posix.ads | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/ada/a-synbar-posix.ads b/gcc-4.9/gcc/ada/a-synbar-posix.ads new file mode 100644 index 000000000..4c01852b0 --- /dev/null +++ b/gcc-4.9/gcc/ada/a-synbar-posix.ads @@ -0,0 +1,84 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |