133 lines
5.2 KiB
Ada
133 lines
5.2 KiB
Ada
------------------------------------------------------------------------------
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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) 1995-2008, AdaCore --
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-- --
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-- GNARL 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 2, or (at your option) any later ver- --
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-- sion. GNARL 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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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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with System.OS_Primitives;
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with System.Soft_Links;
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with System.Traces;
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with System.Parameters;
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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 SSL renames System.Soft_Links;
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use type SSL.Timed_Delay_Call;
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use System.Traces;
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-- Earlier, System.Time_Operations was used to implement the following
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-- operations. The idea was to avoid sucking in the tasking packages. This
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-- did not work. Logically, we can't have it both ways. There is no way to
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-- implement time delays that will have correct task semantics without
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-- reference to the tasking run-time system. To achieve this goal, we now
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-- use soft links.
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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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if System.Parameters.Runtime_Traces then
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Send_Trace_Info (W_Delay, D);
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end if;
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SSL.Timed_Delay.all (Duration'Min (D, OSP.Max_Sensible_Delay),
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OSP.Relative);
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if System.Parameters.Runtime_Traces then
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Send_Trace_Info (M_Delay, D);
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end if;
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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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D : constant Duration := To_Duration (T);
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begin
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if System.Parameters.Runtime_Traces then
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Send_Trace_Info (WU_Delay, D);
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end if;
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SSL.Timed_Delay.all (D, OSP.Absolute_Calendar);
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if System.Parameters.Runtime_Traces then
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Send_Trace_Info (M_Delay, D);
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end if;
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end Delay_Until;
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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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-----------------
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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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begin
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-- Since time has multiple representations on different platforms, a
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-- target independent operation in Ada.Calendar is used to perform
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-- this conversion.
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return Delay_Operations.To_Duration (T);
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end To_Duration;
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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 SSL.Timed_Delay = null then
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SSL.Timed_Delay := Timed_Delay_NT'Access;
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end if;
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end Ada.Calendar.Delays;
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