gcc/ada/5oparame.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                    S Y S T E M . P A R A M E T E R S                     --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.2 $                              --
  10 --                                                                          --
  11 --          Copyright (C) 1997-1998 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This is the OS/2 specific version - default stacksizes need to be large
  37
  38 package body System.Parameters is
  39
  40    ------------------------
  41    -- Default_Stack_Size --
  42    ------------------------
  43
  44    function Default_Stack_Size return Size_Type is
  45    begin
  46       --  The default stack size for extra tasks is based on the
  47       --  default stack size for the main task (8 MB) and for the heap
  48       --  (32 MB).
  49
  50       --  In OS/2 it doesn't hurt to define large stacks, unless
  51       --  the system is configured to commit all memory reservations.
  52       --  This is not a default configuration however.
  53
  54       return 1024 * 1024;
  55    end Default_Stack_Size;
  56
  57    ------------------------
  58    -- Minimum_Stack_Size --
  59    ------------------------
  60
  61    function Minimum_Stack_Size return Size_Type is
  62    begin
  63       --  System functions may need 8 kB of stack, so 12 kB seems a
  64       --  good minimum.
  65       return 12 * 1024;
  66    end Minimum_Stack_Size;
  67
  68    -------------------------
  69    -- Adjust_Storage_Size --
  70    -------------------------
  71
  72    function Adjust_Storage_Size (Size : Size_Type) return Size_Type is
  73    begin
  74       if Size = Unspecified_Size then
  75          return Default_Stack_Size;
  76
  77       elsif Size < Minimum_Stack_Size then
  78          return Minimum_Stack_Size;
  79
  80       else
  81          return Size;
  82       end if;
  83    end Adjust_Storage_Size;
  84
  85 end System.Parameters;