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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . T A S K _ I N F O --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2007-2009, Free Software Foundation, Inc. --
+-- --
+-- 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 Windows (native) version of this module
+
+with System.OS_Interface;
+pragma Unreferenced (System.OS_Interface);
+-- System.OS_Interface is not used today, but the protocol between the
+-- run-time and the binder is that any tasking application uses
+-- System.OS_Interface, so notify the binder with this "with" clause.
+
+package body System.Task_Info is
+
+ N_CPU : Natural := 0;
+ pragma Atomic (N_CPU);
+ -- Cache CPU number. Use pragma Atomic to avoid a race condition when
+ -- setting N_CPU in Number_Of_Processors below.
+
+ --------------------------
+ -- Number_Of_Processors --
+ --------------------------
+
+ function Number_Of_Processors return Positive is
+ begin
+ if N_CPU = 0 then
+ declare
+ SI : aliased Win32.SYSTEM_INFO;
+ begin
+ Win32.GetSystemInfo (SI'Access);
+ N_CPU := Positive (SI.dwNumberOfProcessors);
+ end;
+ end if;
+
+ return N_CPU;
+ end Number_Of_Processors;
+
+end System.Task_Info;