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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- A D A . R E A L _ T I M E . T I M I N G _ E V E N T S --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2005-2006, Free Software Foundation, Inc. --
+-- --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the contents of the part following the private keyword. --
+-- --
+-- GNAT 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. 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. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+with Ada.Finalization;
+
+package Ada.Real_Time.Timing_Events is
+
+ type Timing_Event is tagged limited private;
+
+ type Timing_Event_Handler
+ is access protected procedure (Event : in out Timing_Event);
+
+ procedure Set_Handler
+ (Event : in out Timing_Event;
+ At_Time : Time;
+ Handler : Timing_Event_Handler);
+
+ procedure Set_Handler
+ (Event : in out Timing_Event;
+ In_Time : Time_Span;
+ Handler : Timing_Event_Handler);
+
+ function Current_Handler
+ (Event : Timing_Event) return Timing_Event_Handler;
+
+ procedure Cancel_Handler
+ (Event : in out Timing_Event;
+ Cancelled : out Boolean);
+
+ function Time_Of_Event (Event : Timing_Event) return Time;
+
+private
+
+ protected type Event_State is
+
+ -- D.15 (22/2) requires atomicity with respect to the operations
+ -- provided by the package and the timing events they manipulate. On
+ -- real-time operating systems suitable for implementing this package, a
+ -- different implementation strategy would be employed to meet that
+ -- requirement.
+
+ entry Set (Timeout : Time; Handler : Timing_Event_Handler);
+ -- Changes the timeout and handler values for procedure Set_Handler. Can
+ -- only execute when the event is 'available', to prevent a race
+ -- condition between the caller of Set_Handler and the internal Timer
+ -- task that processes the events. In particular, D.15 (22/2) requires
+ -- that there be no possibility of a new handler executing in response
+ -- to an old timeout.
+
+ procedure Reset;
+ -- First resets the timeout to Time_First and the handler to
+ -- null. Indicates that Set (for Set_Handler) can now change the timeout
+ -- and/or handler. Called only by the interal Timer task.
+
+ procedure Cancel;
+ -- Resets the timeout to Time_First and the handler to
+ -- null. Called by procedure Cancel_Handler and by procedure Reset.
+
+ function Current_Timeout return Time;
+ -- Returns the currently set timeout. The value Time_First is returned
+ -- if the Timing_Event is in the "cleared" state. Called by function
+ -- Time_of_Event.
+
+ function Current_Handler return Timing_Event_Handler;
+ -- Returns the currently set handler. The value null is returned if the
+ -- Timing_Event is in the "cleared" state. Called by function
+ -- Curent_Handler.
+
+ private
+ Timeout : Time := Time_First;
+ -- The time at which the user's handler should be invoked when the
+ -- event is "set" (i.e., when Handler is not null).
+
+ Handler : Timing_Event_Handler;
+ -- An access value designating the protected procedure to be invoked
+ -- at the Timeout time in the future. When this value is null the event
+ -- is said to be "cleared" and no timeout is processed.
+
+ Available : Boolean := True;
+ -- A flag controlling when users can change the Timeout and Handler
+ -- tuple. In particular the entry Set, called by procedure Set_Handler,
+ -- is controlled by this flag.
+
+ end Event_State;
+
+ type Timing_Event is new Ada.Finalization.Limited_Controlled with record
+ Control : Event_State;
+ end record;
+
+ overriding procedure Finalize (This : in out Timing_Event);
+ -- Finalization procedure is required to satisfy (RM D.15 (19/2)), which
+ -- says that the object must be cleared on finalization.
+
+end Ada.Real_Time.Timing_Events;