gcc/ada/s-parame-os2.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 --          Copyright (C) 1997-2002 Free Software Foundation, Inc.          --
  10 --                                                                          --
  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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is the OS/2 specific version - default stacksizes need to be large
  35
  36 package body System.Parameters is
  37
  38    ------------------------
  39    -- Default_Stack_Size --
  40    ------------------------
  41
  42    function Default_Stack_Size return Size_Type is
  43    begin
  44       --  The default stack size for extra tasks is based on the
  45       --  default stack size for the main task (8 MB) and for the heap
  46       --  (32 MB).
  47
  48       --  In OS/2 it doesn't hurt to define large stacks, unless
  49       --  the system is configured to commit all memory reservations.
  50       --  This is not a default configuration however.
  51
  52       return 1024 * 1024;
  53    end Default_Stack_Size;
  54
  55    ------------------------
  56    -- Minimum_Stack_Size --
  57    ------------------------
  58
  59    function Minimum_Stack_Size return Size_Type is
  60    begin
  61       --  System functions may need 8 kB of stack, so 12 kB seems a
  62       --  good minimum.
  63       return 12 * 1024;
  64    end Minimum_Stack_Size;
  65
  66    -------------------------
  67    -- Adjust_Storage_Size --
  68    -------------------------
  69
  70    function Adjust_Storage_Size (Size : Size_Type) return Size_Type is
  71    begin
  72       if Size = Unspecified_Size then
  73          return Default_Stack_Size;
  74
  75       elsif Size < Minimum_Stack_Size then
  76          return Minimum_Stack_Size;
  77
  78       else
  79          return Size;
  80       end if;
  81    end Adjust_Storage_Size;
  82
  83 end System.Parameters;