gcc/ada/s-tadeca.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT 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 --          Copyright (C) 1998-2005 Free Software Foundation, Inc.          --
  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,  51  Franklin  Street,  Fifth  Floor, --
  21 -- Boston, MA 02110-1301, 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.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with Ada.Calendar.Delays;
  36 with System.Task_Primitives.Operations;
  37 with System.Tasking.Initialization;
  38
  39 function System.Tasking.Async_Delays.Enqueue_Calendar
  40   (T    : Ada.Calendar.Time;
  41    D    : Delay_Block_Access)
  42    return Boolean
  43 is
  44    use type Ada.Calendar.Time;
  45 begin
  46    if T <= Ada.Calendar.Clock then
  47       D.Timed_Out := True;
  48       System.Task_Primitives.Operations.Yield;
  49       return False;
  50    end if;
  51
  52    System.Tasking.Initialization.Defer_Abort
  53      (System.Task_Primitives.Operations.Self);
  54    Time_Enqueue (Ada.Calendar.Delays.To_Duration (T), D);
  55    return True;
  56 end System.Tasking.Async_Delays.Enqueue_Calendar;