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--                    Copyright (C) 2008-2015, AdaCore                      --
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--   A Ravenscar-compliant one-shot timer

with System;
with Ada.Real_Time;
with Ada.Real_Time.Timing_Events;

generic
package GNATCOLL.Ravenscar.Timers.One_Shot_Timer is

   procedure Set
     (Instant : Ada.Real_Time.Time;
      Action  : Timer_Action);
   --  Set the timer to an absolute instant in time to execute a specific
   --  action.

   procedure Cancel (Success : out Boolean);
   --  cancel the timer

private

   The_Event : Ada.Real_Time.Timing_Events.Timing_Event;
   --  the timing event

   protected Events is
      --  the handler used to invoke the user-provided action (see procedure
      --  Set).
      pragma Priority (System.Any_Priority'Last);

      procedure Handler
        (Event : in out Ada.Real_Time.Timing_Events.Timing_Event);

      procedure Set_Action
        (Instant : Ada.Real_Time.Time;
         Action  : Timer_Action);

   private

      The_Action : GNATCOLL.Ravenscar.Timers.Timer_Action;

   end Events;

   Events_Handler : constant Ada.Real_Time.Timing_Events.Timing_Event_Handler
                      := Events.Handler'Access;

end GNATCOLL.Ravenscar.Timers.One_Shot_Timer;
