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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- A D A . C A L E N D A R . D E L A Y S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1991-1994, Florida State University --
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-- Copyright (C) 1995-2010, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the Alpha/VMS version
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with System.OS_Primitives;
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with System.Soft_Links;
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package body Ada.Calendar.Delays is
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package OSP renames System.OS_Primitives;
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package TSL renames System.Soft_Links;
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use type TSL.Timed_Delay_Call;
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure Timed_Delay_NT (Time : Duration; Mode : Integer);
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-- Timed delay procedure used when no tasking is active
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---------------
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-- Delay_For --
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---------------
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procedure Delay_For (D : Duration) is
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begin
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TSL.Timed_Delay.all
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(Duration'Min (D, OSP.Max_Sensible_Delay), OSP.Relative);
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end Delay_For;
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-----------------
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-- Delay_Until --
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-----------------
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procedure Delay_Until (T : Time) is
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begin
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TSL.Timed_Delay.all (To_Duration (T), OSP.Absolute_Calendar);
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end Delay_Until;
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-----------------
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-- To_Duration --
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-----------------
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function To_Duration (T : Time) return Duration is
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Safe_Ada_High : constant Time := Time_Of (2250, 1, 1, 0.0);
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-- A value distant enough to emulate "end of time" but which does not
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-- cause overflow.
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Safe_T : constant Time :=
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(if T > Safe_Ada_High then Safe_Ada_High else T);
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begin
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return OSP.To_Duration (OSP.OS_Time (Safe_T), OSP.Absolute_Calendar);
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end To_Duration;
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--------------------
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-- Timed_Delay_NT --
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--------------------
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procedure Timed_Delay_NT (Time : Duration; Mode : Integer) is
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begin
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OSP.Timed_Delay (Time, Mode);
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end Timed_Delay_NT;
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begin
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-- Set up the Timed_Delay soft link to the non tasking version if it has
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-- not been already set. If tasking is present, Timed_Delay has already set
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-- this soft link, or this will be overridden during the elaboration of
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-- System.Tasking.Initialization
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if TSL.Timed_Delay = null then
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TSL.Timed_Delay := Timed_Delay_NT'Access;
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end if;
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end Ada.Calendar.Delays;
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