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Subject: RE: Timing events in GNAT GPL 2006
Date: Fri, 12 Jan 2007 09:40:19 -0800
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Thread-Topic: Timing events in GNAT GPL 2006
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Date: 2007-01-12T20:25:02+01:00

--
with Ada.Real_Time;                use Ada.Real_Time;
with Ada.Real_Time.Timing_Events;  use Ada.Real_Time.Timing_Events;
with Ada.Text_IO;                  use Ada.Text_IO;

procedure Test_Timing_Event is

   protected Clock_Tick is
      procedure Inc_Clock (Ev : Timing_Event);
   end Clock_Tick;

   Tick    : Timing_Event;
   One_Sec : constant Time_Span :=3D Seconds (1);

   protected body Clock_Tick is
      procedure Inc_Clock (Ev : Timing_Event)
      is
      begin
         Put_Line ("Inc_Sec");
         -- using Time_Span
         Set_Handler (Tick, One_Sec, Handler =3D> Inc_Clock'Access);
      end Inc_Clock;
   end Clock_Tick;

begin
   -- using absolute time
   Set_Handler (Tick, Clock + One_Sec, Clock_Tick.Inc_Clock'Access);
   loop null; end loop;
end Test_Timing_Event;

-- >>

There are three things wrong with your codes. Two of them are critical.
1. The protected procedure Inc_Clock has wrong parameter mode. It must
be in out mode.
2. The call Set_Handler from the protected procedure will result in a
deadlock it is run.
3. Protected object must be declared at the library level. Yours is not.
As the result, non-local pointer cannot point to local object error at
lines 20 and 26

I designed for both one shot and periodic timers using Timing Event. If
it is helpful, I will post my code here. Just let me know.

AV