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author | Ben Cheng <bccheng@google.com> | 2013-03-28 11:14:20 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2013-03-28 12:40:33 -0700 |
commit | af0c51ac87ab2a87caa03fa108f0d164987a2764 (patch) | |
tree | 4b8b470f7c5b69642fdab8d0aa1fbc148d02196b /gcc-4.8/gcc/ada/s-atocou.ads | |
parent | d87cae247d39ebf4f5a6bf25c932a14d2fdb9384 (diff) | |
download | toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.tar.gz toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.tar.bz2 toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.zip |
[GCC 4.8] Initial check-in of GCC 4.8.0
Change-Id: I0719d8a6d0f69b367a6ab6f10eb75622dbf12771
Diffstat (limited to 'gcc-4.8/gcc/ada/s-atocou.ads')
-rw-r--r-- | gcc-4.8/gcc/ada/s-atocou.ads | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/gcc-4.8/gcc/ada/s-atocou.ads b/gcc-4.8/gcc/ada/s-atocou.ads new file mode 100644 index 000000000..cad18d298 --- /dev/null +++ b/gcc-4.8/gcc/ada/s-atocou.ads @@ -0,0 +1,77 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . A T O M I C _ C O U N T E R S -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2011, AdaCore -- +-- -- +-- 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 package provides atomic counter on platforms where it is supported: +-- - all Alpha platforms +-- - all ia64 platforms +-- - all PowerPC platforms +-- - all SPARC V9 platforms +-- - all x86 platforms +-- - all x86_64 platforms + +-- Why isn't this package available to application programs??? + +package System.Atomic_Counters is + + pragma Preelaborate; + + type Atomic_Counter is limited private; + -- Type for atomic counter objects. Note, initial value of the counter is + -- one. This allows using an atomic counter as member of record types when + -- object of these types are created at library level in preelaborable + -- compilation units. + -- + -- Atomic_Counter is declared as private limited type to provide highest + -- level of protection from unexpected use. All available operations are + -- declared below, and this set should be as small as possible. + + procedure Increment (Item : in out Atomic_Counter); + pragma Inline_Always (Increment); + -- Increments value of atomic counter. + + function Decrement (Item : in out Atomic_Counter) return Boolean; + pragma Inline_Always (Decrement); + -- Decrements value of atomic counter, returns True when value reach zero. + + function Is_One (Item : Atomic_Counter) return Boolean; + pragma Inline_Always (Is_One); + -- Returns True when value of the atomic counter is one. + +private + + type Unsigned_32 is mod 2 ** 32; + + type Atomic_Counter is limited record + Value : aliased Unsigned_32 := 1; + pragma Atomic (Value); + end record; + +end System.Atomic_Counters; |