gcc/ada/4vcaldel.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                   A D A . C A L E N D A R . D E L A Y S                  --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --                                                                          --
  10 --             Copyright (C) 1991-2000 Florida State University             --
  11 --                                                                          --
  12 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University. It is --
  31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  32 -- State University (http://www.gnat.com).                                  --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This is the Alpha/VMS version.
  37
  38 with System.OS_Primitives;
  39 --  Used for Max_Sensible_Delay
  40
  41 with System.Soft_Links;
  42 --  Used for Timed_Delay
  43
  44 package body Ada.Calendar.Delays is
  45
  46    package OSP renames System.OS_Primitives;
  47    package TSL renames System.Soft_Links;
  48
  49    use type TSL.Timed_Delay_Call;
  50
  51    ---------------
  52    -- Delay_For --
  53    ---------------
  54
  55    procedure Delay_For (D : Duration) is
  56    begin
  57       TSL.Timed_Delay.all
  58         (Duration'Min (D, OSP.Max_Sensible_Delay), OSP.Relative);
  59    end Delay_For;
  60
  61    -----------------
  62    -- Delay_Until --
  63    -----------------
  64
  65    procedure Delay_Until (T : Time) is
  66    begin
  67       TSL.Timed_Delay.all (To_Duration (T), OSP.Absolute_Calendar);
  68    end Delay_Until;
  69
  70    -----------------
  71    -- To_Duration --
  72    -----------------
  73
  74    function To_Duration (T : Time) return Duration is
  75    begin
  76       return OSP.To_Duration (OSP.OS_Time (T), OSP.Absolute_Calendar);
  77    end To_Duration;
  78
  79    --------------------
  80    -- Timed_Delay_NT --
  81    --------------------
  82
  83    procedure Timed_Delay_NT (Time : Duration; Mode : Integer);
  84
  85    procedure Timed_Delay_NT (Time : Duration; Mode : Integer) is
  86    begin
  87       OSP.Timed_Delay (Time, Mode);
  88    end Timed_Delay_NT;
  89
  90 begin
  91    --  Set up the Timed_Delay soft link to the non tasking version if it has
  92    --  not been already set.
  93    --  If tasking is present, Timed_Delay has already set this soft link, or
  94    --  this will be overriden during the elaboration of
  95    --  System.Tasking.Initialization
  96
  97    if TSL.Timed_Delay = null then
  98       TSL.Timed_Delay := Timed_Delay_NT'Access;
  99    end if;
 100 end Ada.Calendar.Delays;