gcc/ada/a-diroro.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --          A D A . D I S P A T C H I N G . R O U N D _ R O B I N           --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --            Copyright (C) 2006, 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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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 package body Ada.Dispatching.Round_Robin is
  35
  36    -----------------
  37    -- Set_Quantum --
  38    -----------------
  39
  40    procedure Set_Quantum
  41      (Pri     : System.Priority;
  42       Quantum : Ada.Real_Time.Time_Span)
  43    is
  44       pragma Unreferenced (Quantum);
  45    begin
  46       if not Is_Round_Robin (Pri) then
  47          raise Dispatching_Policy_Error;
  48       end if;
  49    end Set_Quantum;
  50
  51    -----------------
  52    -- Set_Quantum --
  53    -----------------
  54
  55    procedure Set_Quantum
  56      (Low, High : System.Priority;
  57       Quantum   : Ada.Real_Time.Time_Span)
  58    is
  59       pragma Unreferenced (Quantum);
  60    begin
  61       for Index in Low .. High loop
  62          if not Is_Round_Robin (Index) then
  63             raise Dispatching_Policy_Error;
  64          end if;
  65       end loop;
  66    end Set_Quantum;
  67
  68    --------------------
  69    -- Actual_Quantum --
  70    --------------------
  71
  72    function Actual_Quantum
  73      (Pri : System.Priority) return Ada.Real_Time.Time_Span
  74    is
  75    begin
  76       if Is_Round_Robin (Pri) then
  77          return Default_Quantum;
  78       else
  79          raise Dispatching_Policy_Error;
  80       end if;
  81    end Actual_Quantum;
  82
  83    --------------------
  84    -- Is_Round_Robin --
  85    --------------------
  86
  87    function Is_Round_Robin (Pri : System.Priority) return Boolean is
  88       function Get_Policy (Prio : System.Any_Priority) return Character;
  89       pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
  90    begin
  91       return Get_Policy (Pri) = 'R';
  92    end Is_Round_Robin;
  93
  94 end Ada.Dispatching.Round_Robin;