1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . P A R A M E T E R S --
9 -- Copyright (C) 1995-2013, Free Software Foundation, Inc. --
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. --
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. --
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/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This is the default (used on all native platforms) version of this package
34 pragma Compiler_Unit_Warning;
36 package body System.Parameters is
38 -------------------------
39 -- Adjust_Storage_Size --
40 -------------------------
42 function Adjust_Storage_Size (Size : Size_Type) return Size_Type is
44 if Size = Unspecified_Size then
45 return Default_Stack_Size;
46 elsif Size < Minimum_Stack_Size then
47 return Minimum_Stack_Size;
51 end Adjust_Storage_Size;
53 ------------------------
54 -- Default_Stack_Size --
55 ------------------------
57 function Default_Stack_Size return Size_Type is
58 Default_Stack_Size : Integer;
59 pragma Import (C, Default_Stack_Size, "__gl_default_stack_size");
61 if Default_Stack_Size = -1 then
62 return 2 * 1024 * 1024;
64 return Size_Type (Default_Stack_Size);
66 end Default_Stack_Size;
68 ------------------------
69 -- Minimum_Stack_Size --
70 ------------------------
72 function Minimum_Stack_Size return Size_Type is
74 -- 12K is required for stack-checking to work reliably on most platforms
75 -- when using the GCC scheme to propagate an exception in the ZCX case.
76 -- 16K is the value of PTHREAD_STACK_MIN under Linux, so is a reasonable
80 end Minimum_Stack_Size;
82 end System.Parameters;