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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) 1995-2010, AdaCore --
+-- --
+-- GNAT 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 3, or (at your option) any later ver- --
+-- sion. GNAT 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- 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;
+with System.Soft_Links;
+
+package body Ada.Calendar.Delays is
+
+ package OSP renames System.OS_Primitives;
+ package TSL renames System.Soft_Links;
+
+ use type TSL.Timed_Delay_Call;
+
+ -----------------------
+ -- Local Subprograms --
+ -----------------------
+
+ procedure Timed_Delay_NT (Time : Duration; Mode : Integer);
+ -- Timed delay procedure used when no tasking is active
+
+ ---------------
+ -- 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
+ Safe_Ada_High : constant Time := Time_Of (2250, 1, 1, 0.0);
+ -- A value distant enough to emulate "end of time" but which does not
+ -- cause overflow.
+
+ Safe_T : constant Time :=
+ (if T > Safe_Ada_High then Safe_Ada_High else T);
+
+ begin
+ return OSP.To_Duration (OSP.OS_Time (Safe_T), OSP.Absolute_Calendar);
+ end To_Duration;
+
+ --------------------
+ -- Timed_Delay_NT --
+ --------------------
+
+ 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 overridden 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;