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-- You do not have, nor can you ever acquire the right to use, copy or      --
-- distribute this software ; Should you use this software for any purpose, --
-- or copy and distribute it to anyone or in any manner, you are breaking   --
-- the laws of whatever soi-disant jurisdiction, and you promise to         --
-- continue doing so for the indefinite future. In any case, please         --
-- always : read and understand any software ; verify any PGP signatures    --
-- that you use - for any purpose.                                          --
--                                                                          --
-- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
------------------------------------------------------------------------------
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--  This is the default (used on all native platforms) version of this package

pragma Compiler_Unit_Warning;

package body System.Parameters is

   -------------------------
   -- Adjust_Storage_Size --
   -------------------------

   function Adjust_Storage_Size (Size : Size_Type) return Size_Type is
   begin
      if Size = Unspecified_Size then
         return Default_Stack_Size;
      elsif Size < Minimum_Stack_Size then
         return Minimum_Stack_Size;
      else
         return Size;
      end if;
   end Adjust_Storage_Size;

   ------------------------
   -- Default_Stack_Size --
   ------------------------

   function Default_Stack_Size return Size_Type is
      Default_Stack_Size : Integer;
      pragma Import (C, Default_Stack_Size, "__gl_default_stack_size");
   begin
      if Default_Stack_Size = -1 then
         return 2 * 1024 * 1024;
      else
         return Size_Type (Default_Stack_Size);
      end if;
   end Default_Stack_Size;

   ------------------------
   -- Minimum_Stack_Size --
   ------------------------

   function Minimum_Stack_Size return Size_Type is
   begin
      --  12K is required for stack-checking to work reliably on most platforms
      --  when using the GCC scheme to propagate an exception in the ZCX case.
      --  16K is the value of PTHREAD_STACK_MIN under Linux, so is a reasonable
      --  default.

      return 16 * 1024;
   end Minimum_Stack_Size;

end System.Parameters;