1------------------------------------------------------------------------------
2--                                                                          --
3--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4--                                                                          --
5--                   A D A . C A L E N D A R . D E L A Y S                  --
6--                                                                          --
7--                                  S p e c                                 --
8--                                                                          --
9--          Copyright (C) 1992-2018, 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--  This package implements Calendar.Time delays using protected objects
33
34--  Note: the compiler generates direct calls to this interface, in the
35--  processing of time types.
36
37package Ada.Calendar.Delays is
38
39   procedure Delay_For (D : Duration);
40   --  Delay until an interval of length (at least) D seconds has passed, or
41   --  the task is aborted to at least the current ATC nesting level. This is
42   --  an abort completion point. The body of this procedure must perform all
43   --  the processing required for an abort point.
44
45   procedure Delay_Until (T : Time);
46   --  Delay until Clock has reached (at least) time T, or the task is aborted
47   --  to at least the current ATC nesting level. The body of this procedure
48   --  must perform all the processing required for an abort point.
49
50   function To_Duration (T : Time) return Duration;
51   --  Convert Time to Duration elapsed since UNIX epoch
52
53end Ada.Calendar.Delays;
54