gcc/ada/libgnarl/s-tadert.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --                  SYSTEM.TASKING.ASYNC_DELAYS.ENQUEUE_RT                  --
   6 --                                                                          --
   7 --                                B o d y                                   --
   8 --                                                                          --
   9 --          Copyright (C) 1998-2017, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNARL 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with Ada.Real_Time;
  33 with Ada.Real_Time.Delays;
  34 with System.Task_Primitives.Operations;
  35 with System.Tasking.Initialization;
  36
  37 function System.Tasking.Async_Delays.Enqueue_RT
  38   (T : Ada.Real_Time.Time;
  39    D : Delay_Block_Access) return Boolean
  40 is
  41    use type Ada.Real_Time.Time;  -- for "=" operator
  42 begin
  43    if T <= Ada.Real_Time.Clock then
  44       D.Timed_Out := True;
  45       System.Task_Primitives.Operations.Yield;
  46       return False;
  47    end if;
  48
  49    System.Tasking.Initialization.Defer_Abort
  50      (System.Task_Primitives.Operations.Self);
  51    Time_Enqueue (Ada.Real_Time.Delays.To_Duration (T), D);
  52    return True;
  53 end System.Tasking.Async_Delays.Enqueue_RT;