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------------------------------------------------------------------------------
-- --
-- GNU ADA RUNTIME LIBRARY (GNARL) COMPONENTS --
-- --
-- A D A . C A L E N D A R . D E L A Y S --
-- --
-- B o d y --
-- (Version for new GNARL) --
-- --
-- $Revision: 1.28 $ --
-- --
-- Copyright (C) 1991,1992,1993,1994,1995,1996 Florida State University --
-- --
-- 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 2, or (at your option) any later ver- --
-- sion. GNARL 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. It is --
-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
-- State University (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
with System.Task_Primitives.Operations;
-- Used for Yield
with System.Time_Operations;
-- Used for Delay_For
-- Delay_Until
with System.Task_Timer;
-- Used for Timer
-- Delay_Block
-- Max_Sensible_Delay
with System.Tasking.Initialization;
-- Used for Defer/Undefer_Abort
package body Ada.Calendar.Delays is
------------------
-- Delay_Object --
------------------
protected body Delay_Object is
entry Wait (T : Duration; D : access System.Task_Timer.Delay_Block)
when True is
begin
if T <= 0.0 then
System.Task_Primitives.Operations.Yield;
return;
end if;
requeue System.Task_Timer.Timer.Enqueue_Duration with abort;
end Wait;
end Delay_Object;
------------------------
-- Delay_Until_Object --
------------------------
protected body Delay_Until_Object is
entry Wait (T : Time; D : access System.Task_Timer.Delay_Block)
when True is
begin
if T <= Clock then
System.Task_Primitives.Operations.Yield;
return;
end if;
requeue System.Task_Timer.Timer.Enqueue_Calendar_Time with abort;
end Wait;
end Delay_Until_Object;
-- For the following Delay operations we do not want to suck in the GNARL
-- packages. Eventually above two delay object related routines will be
-- moved out of this package. If that happen, we do not want the variable
-- Max_Sensible_Delay to be imported from System.Task_Timer which will
-- bring the whole tasking RTS in. Also, we do not want Defer_Abortion
-- to be brought in either. In such cases, we should implement
-- the following operations via a soft_link.
---------------
-- Delay_For --
---------------
procedure Delay_For (D : Duration) is
begin
System.Tasking.Initialization.Defer_Abortion;
System.Time_Operations.Delay_For
(Duration'Min (D, System.Task_Timer.Max_Sensible_Delay));
System.Tasking.Initialization.Undefer_Abortion;
end Delay_For;
-----------------
-- Delay_Until --
-----------------
procedure Delay_Until (T : Time) is
begin
System.Tasking.Initialization.Defer_Abortion;
System.Time_Operations.Delay_Until (To_Duration (T));
System.Tasking.Initialization.Undefer_Abortion;
end Delay_Until;
-----------------
-- To_Duration --
-----------------
function To_Duration (T : Time) return Duration is
begin
return Duration (T);
end To_Duration;
end Ada.Calendar.Delays;
|
