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jeremybenn |
------------------------------------------------------------------------------
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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 . R E A L _ T I M E . 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) 1992-2009, Free Software Foundation, Inc. --
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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 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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with Ada.Exceptions;
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with System.Tasking;
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with System.Task_Primitives.Operations;
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package body Ada.Real_Time.Delays is
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package STPO renames System.Task_Primitives.Operations;
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----------------
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-- Local Data --
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----------------
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Absolute_RT : constant := 2;
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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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Self_Id : constant System.Tasking.Task_Id := STPO.Self;
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begin
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-- If pragma Detect_Blocking is active, Program_Error must be
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-- raised if this potentially blocking operation is called from a
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-- protected action.
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if System.Tasking.Detect_Blocking
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and then Self_Id.Common.Protected_Action_Nesting > 0
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then
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Ada.Exceptions.Raise_Exception
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(Program_Error'Identity, "potentially blocking operation");
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else
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STPO.Timed_Delay (Self_Id, To_Duration (T), Absolute_RT);
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end if;
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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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begin
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return To_Duration (Time_Span (T));
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end To_Duration;
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begin
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-- Ensure that the tasking run time is initialized when using delay
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-- operations. The initialization routine has the required machinery to
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-- prevent multiple calls to Initialize.
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System.Tasking.Initialize;
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end Ada.Real_Time.Delays;
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