1------------------------------------------------------------------------------
2--                                                                          --
3--                  GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                --
4--                                                                          --
5--                   A D A . R E A L _ T I M E . D E L A Y S                --
6--                                                                          --
7--                                  B o d y                                 --
8--                                                                          --
9--         Copyright (C) 1992-2010, 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
32with Ada.Exceptions;
33
34with System.Tasking;
35with System.Task_Primitives.Operations;
36
37package body Ada.Real_Time.Delays is
38
39   package STPO renames System.Task_Primitives.Operations;
40
41   ----------------
42   -- Local Data --
43   ----------------
44
45   Absolute_RT : constant := 2;
46
47   -----------------
48   -- Delay_Until --
49   -----------------
50
51   procedure Delay_Until (T : Time) is
52      Self_Id : constant System.Tasking.Task_Id := STPO.Self;
53
54   begin
55      --  If pragma Detect_Blocking is active, Program_Error must be
56      --  raised if this potentially blocking operation is called from a
57      --  protected action.
58
59      if System.Tasking.Detect_Blocking
60        and then Self_Id.Common.Protected_Action_Nesting > 0
61      then
62         Ada.Exceptions.Raise_Exception
63           (Program_Error'Identity, "potentially blocking operation");
64      else
65         STPO.Timed_Delay (Self_Id, To_Duration (T), Absolute_RT);
66      end if;
67   end Delay_Until;
68
69   -----------------
70   -- To_Duration --
71   -----------------
72
73   function To_Duration (T : Time) return Duration is
74   begin
75      return To_Duration (Time_Span (T));
76   end To_Duration;
77
78end Ada.Real_Time.Delays;
79