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159 | ------------------------------------------------------------------------------
-- --
-- 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 --
-- --
-- B o d y --
-- --
-- Copyright (C) 2005-2023, Free Software Foundation, Inc. --
-- --
-- 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 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with System.BB.Time;
with System.BB.Protection;
package body Ada.Real_Time.Timing_Events is
procedure Handler_Wrapper
(Event : in out System.BB.Timing_Events.Timing_Event'Class) with
-- This wrapper is needed to make a clean conversion between
-- System.BB.Timing_Events.Timing_Event_Handler and
-- Ada.Real_Time.Timing_Events.Timing_Event_Handler.
Pre =>
-- Timing_Event can only be defined from the type defined in RM D.15
-- Ada.Real_Time.Timing_Events.Timing_Event.
Event in Ada.Real_Time.Timing_Events.Timing_Event;
package SBTE renames System.BB.Timing_Events;
---------------------
-- Handler_Wrapper --
---------------------
procedure Handler_Wrapper
(Event : in out System.BB.Timing_Events.Timing_Event'Class)
is
RT_Event : Timing_Event renames Timing_Event (Event);
-- View conversion on the parameter
Handler : constant Timing_Event_Handler := RT_Event.Real_Handler;
begin
if Handler /= null then
RT_Event.Real_Handler := null;
Handler.all (RT_Event);
end if;
end Handler_Wrapper;
-----------------
-- Set_Handler --
-----------------
procedure Set_Handler
(Event : in out Timing_Event;
At_Time : Time;
Handler : Timing_Event_Handler)
is
BB_Handler : constant System.BB.Timing_Events.Timing_Event_Handler :=
(if Handler = null then null else Handler_Wrapper'Access);
-- Keep a null low-level handler if we are setting a null handler
-- (meaning that we the event is to be cleared as per D.15 par. 11/3).
-- Otherwise, pass the address of the wrapper in charge of executing
-- the actual handler (we need a wrapper because in addition to execute
-- the handler we need to set the handler to null to indicate that it
-- has already been executed).
begin
-- The access to the event must be protected and atomic
System.BB.Protection.Enter_Kernel;
Event.Real_Handler := Handler;
SBTE.Set_Handler (SBTE.Timing_Event (Event),
System.BB.Time.Time (At_Time),
BB_Handler);
System.BB.Protection.Leave_Kernel;
end Set_Handler;
---------------------
-- Current_Handler --
---------------------
function Current_Handler
(Event : Timing_Event) return Timing_Event_Handler
is
Res : Timing_Event_Handler;
begin
-- The access to the event must be protected and atomic
System.BB.Protection.Enter_Kernel;
Res := Event.Real_Handler;
System.BB.Protection.Leave_Kernel;
return Res;
end Current_Handler;
--------------------
-- Cancel_Handler --
--------------------
procedure Cancel_Handler
(Event : in out Timing_Event;
Cancelled : out Boolean)
is
begin
-- The access to the event must be protected and atomic
System.BB.Protection.Enter_Kernel;
SBTE.Cancel_Handler (SBTE.Timing_Event (Event), Cancelled);
Event.Real_Handler := null;
System.BB.Protection.Leave_Kernel;
end Cancel_Handler;
-------------------
-- Time_Of_Event --
-------------------
function Time_Of_Event (Event : Timing_Event) return Time is
Res : Time;
begin
-- The access to the event must be protected and atomic
System.BB.Protection.Enter_Kernel;
Res := Time (SBTE.Time_Of_Event (SBTE.Timing_Event (Event)));
System.BB.Protection.Leave_Kernel;
return Res;
end Time_Of_Event;
end Ada.Real_Time.Timing_Events;
|