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