1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                     S Y S T E M . T A S K _ I N F O                      --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--            Copyright (C) 2009, Free Software Foundation, Inc.            --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This is the GNU/Linux version of this module
33
34package body System.Task_Info is
35
36   N_CPU : Natural := 0;
37   pragma Atomic (N_CPU);
38   --  Cache CPU number. Use pragma Atomic to avoid a race condition when
39   --  setting N_CPU in Number_Of_Processors below.
40
41   --------------------------
42   -- Number_Of_Processors --
43   --------------------------
44
45   function Number_Of_Processors return Positive is
46   begin
47      if N_CPU = 0 then
48         N_CPU := Natural
49           (OS_Interface.sysconf (OS_Interface.SC_NPROCESSORS_ONLN));
50      end if;
51
52      return N_CPU;
53   end Number_Of_Processors;
54
55end System.Task_Info;
56