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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- --
+-- A D A . C A L E N D A R . D E L A Y S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1991-1994, Florida State University --
+-- Copyright (C) 1995-2005, AdaCore --
+-- --
+-- GNARL is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 2, or (at your option) any later ver- --
+-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNARL; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the Alpha/VMS version
+
+with System.OS_Primitives;
+-- Used for Max_Sensible_Delay
+
+with System.Soft_Links;
+-- Used for Timed_Delay
+
+package body Ada.Calendar.Delays is
+
+ package OSP renames System.OS_Primitives;
+ package TSL renames System.Soft_Links;
+
+ use type TSL.Timed_Delay_Call;
+
+ ---------------
+ -- Delay_For --
+ ---------------
+
+ procedure Delay_For (D : Duration) is
+ begin
+ TSL.Timed_Delay.all
+ (Duration'Min (D, OSP.Max_Sensible_Delay), OSP.Relative);
+ end Delay_For;
+
+ -----------------
+ -- Delay_Until --
+ -----------------
+
+ procedure Delay_Until (T : Time) is
+ begin
+ TSL.Timed_Delay.all (To_Duration (T), OSP.Absolute_Calendar);
+ end Delay_Until;
+
+ -----------------
+ -- To_Duration --
+ -----------------
+
+ function To_Duration (T : Time) return Duration is
+ begin
+ return OSP.To_Duration (OSP.OS_Time (T), OSP.Absolute_Calendar);
+ end To_Duration;
+
+ --------------------
+ -- Timed_Delay_NT --
+ --------------------
+
+ procedure Timed_Delay_NT (Time : Duration; Mode : Integer);
+
+ procedure Timed_Delay_NT (Time : Duration; Mode : Integer) is
+ begin
+ OSP.Timed_Delay (Time, Mode);
+ end Timed_Delay_NT;
+
+begin
+ -- Set up the Timed_Delay soft link to the non tasking version if it has
+ -- not been already set.
+ -- If tasking is present, Timed_Delay has already set this soft link, or
+ -- this will be overriden during the elaboration of
+ -- System.Tasking.Initialization
+
+ if TSL.Timed_Delay = null then
+ TSL.Timed_Delay := Timed_Delay_NT'Access;
+ end if;
+end Ada.Calendar.Delays;