------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- S Y S T E M . R A N D O M _ S E E D -- -- -- -- B o d y -- -- -- -- Copyright (C) 2011-2019, 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 -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- Version used on all systems except Ravenscar where Calendar is unavailable with Ada.Calendar; use Ada.Calendar; with Ada.Unchecked_Conversion; package body System.Random_Seed is Y2K : constant Time := Time_Of (Year => 2000, Month => 1, Day => 1, Seconds => 0.0); -- First day of Year 2000, to get a duration function To_U64 is new Ada.Unchecked_Conversion (Duration, Interfaces.Unsigned_64); -------------- -- Get_Seed -- -------------- function Get_Seed return Interfaces.Unsigned_64 is begin return To_U64 (Clock - Y2K); end Get_Seed; end System.Random_Seed;