File : a-retide.adb
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 -- --
19 -- --
20 -- --
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.Exceptions;
33
34 with System.Tasking;
35 with System.Task_Primitives.Operations;
36
37 package 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
78 end Ada.Real_Time.Delays;