1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- SYSTEM.TASKING.ASYNC_DELAYS.ENQUEUE_CALENDAR --
9 -- Copyright (C) 1998-2013, Free Software Foundation, Inc. --
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. --
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. --
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/>. --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
30 ------------------------------------------------------------------------------
32 with Ada.Calendar.Delays;
34 with System.OS_Constants;
35 with System.OS_Primitives;
36 with System.Task_Primitives.Operations;
37 with System.Tasking.Initialization;
39 function System.Tasking.Async_Delays.Enqueue_Calendar
40 (T : Ada.Calendar.Time;
41 D : Delay_Block_Access) return Boolean
43 use type Ada.Calendar.Time;
45 package SOSC renames System.OS_Constants;
46 package STPO renames System.Task_Primitives.Operations;
48 RT_T : Duration := Ada.Calendar.Delays.To_Duration (T);
51 if T <= Ada.Calendar.Clock then
53 System.Task_Primitives.Operations.Yield;
57 -- T is expressed as a duration elapsed since the UNIX epoch, whereas
58 -- Time_Enqueue expects duration elapsed since the epoch of the Ada real-
59 -- time clock: compensate if necessary.
61 -- Comparison "SOSC.CLOCK_RT_Ada = SOSC.CLOCK_REALTIME" is compile
62 -- time known, so turn warnings off.
64 pragma Warnings (Off);
66 if SOSC.CLOCK_RT_Ada /= SOSC.CLOCK_REALTIME then
69 RT_T := RT_T - OS_Primitives.Monotonic_Clock + STPO.Monotonic_Clock;
72 System.Tasking.Initialization.Defer_Abort
73 (System.Task_Primitives.Operations.Self);
74 Time_Enqueue (RT_T, D);
76 end System.Tasking.Async_Delays.Enqueue_Calendar;