-- --
-- S p e c --
-- --
--- Copyright (C) 2005-2006, Free Software Foundation, Inc. --
+-- Copyright (C) 2005-2009, 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 --
-- --
-- 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- --
+-- 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. 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. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- 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. --
+-- 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
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
+ type Timing_Event is new Ada.Finalization.Limited_Controlled with record
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).
-- 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);
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