gcc/ada/s-tadeca.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --          S Y S T E M . T A S K I N G . A S Y N C _ D E L A Y S .         --
   6 --                     E N Q U E U E _ C A L E N D A R                      --
   7 --                                                                          --
   8 --                                  B o d y                                 --
   9 --                                                                          --
  10 --                             $Revision: 1.1 $
  11 --                                                                          --
  12 --           Copyright (C) 1998-1999 Ada Core Technologies, Inc.            --
  13 --                                                                          --
  14 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  15 -- terms of the  GNU General Public License as published  by the Free Soft- --
  16 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  17 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  18 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  19 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  20 -- for  more details.  You should have  received  a copy of the GNU General --
  21 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  22 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  23 -- MA 02111-1307, USA.                                                      --
  24 --                                                                          --
  25 -- As a special exception,  if other files  instantiate  generics from this --
  26 -- unit, or you link  this unit with other files  to produce an executable, --
  27 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  28 -- covered  by the  GNU  General  Public  License.  This exception does not --
  29 -- however invalidate  any other reasons why  the executable file  might be --
  30 -- covered by the  GNU Public License.                                      --
  31 --                                                                          --
  32 -- GNARL was developed by the GNARL team at Florida State University. It is --
  33 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  34 -- State University (http://www.gnat.com).                                  --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 with Ada.Calendar.Delays;
  39 with System.Task_Primitives.Operations;
  40 with System.Tasking.Initialization;
  41
  42 function System.Tasking.Async_Delays.Enqueue_Calendar
  43   (T : in Ada.Calendar.Time;
  44    D : Delay_Block_Access) return Boolean
  45 is
  46    use type Ada.Calendar.Time;
  47 begin
  48    if T <= Ada.Calendar.Clock then
  49       D.Timed_Out := True;
  50       System.Task_Primitives.Operations.Yield;
  51       return False;
  52    end if;
  53
  54    System.Tasking.Initialization.Defer_Abort
  55      (System.Task_Primitives.Operations.Self);
  56    Time_Enqueue (Ada.Calendar.Delays.To_Duration (T), D);
  57    return True;
  58 end System.Tasking.Async_Delays.Enqueue_Calendar;