1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- A D A . R E A L _ T I M E . D E L A Y S --
9 -- Copyright (C) 1992-2006, 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 2, or (at your option) any later ver- --
14 -- sion. GNARL 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
35 -- Used for Raise_Exception
41 with System.Task_Primitives.Operations;
42 -- Used for Timed_Delay
45 package body Ada.Real_Time.Delays is
47 package STPO renames System.Task_Primitives.Operations;
53 Absolute_RT : constant := 2;
59 procedure Delay_Until (T : Time) is
60 Self_Id : constant System.Tasking.Task_Id := STPO.Self;
63 -- If pragma Detect_Blocking is active, Program_Error must be
64 -- raised if this potentially blocking operation is called from a
67 if System.Tasking.Detect_Blocking
68 and then Self_Id.Common.Protected_Action_Nesting > 0
70 Ada.Exceptions.Raise_Exception
71 (Program_Error'Identity, "potentially blocking operation");
73 STPO.Timed_Delay (Self_Id, To_Duration (T), Absolute_RT);
81 function To_Duration (T : Time) return Duration is
83 return To_Duration (Time_Span (T));
87 -- Ensure that the tasking run time is initialized when using delay
88 -- operations. The initialization routine has the required machinery to
89 -- prevent multiple calls to Initialize.
91 System.Tasking.Initialize;
92 end Ada.Real_Time.Delays;