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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--             A D A . E X E C U T I O N _ T I M E . T I M E R S            --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

-- This specification is derived from the Ada Reference Manual for use with --

-- GNAT.  In accordance with the copyright of that document, you can freely --

-- copy and modify this specification,  provided that if you redistribute a --

-- modified version,  any changes that you have made are clearly indicated. --

--                                                                          --

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--  This unit is not implemented in typical GNAT implementations that lie on

--  top of operating systems, because it is infeasible to implement in such

--  environments.

--  If a target environment provides appropriate support for this package,

--  then the Unimplemented_Unit pragma should be removed from this spec and

--  an appropriate body provided.

with System;

package Ada.Execution_Time.Timers is

   pragma Preelaborate;

   pragma Unimplemented_Unit;

   type Timer (T : not null access constant Ada.Task_Identification.Task_Id) is

      tagged limited private;

   type Timer_Handler is access protected procedure (TM : in out Timer);

   Min_Handler_Ceiling : constant System.Any_Priority := System.Priority'Last;

   procedure Set_Handler

     (TM      : in out Timer;

      In_Time : Ada.Real_Time.Time_Span;

      Handler : Timer_Handler);

   procedure Set_Handler

     (TM      : in out Timer;

      At_Time : CPU_Time;

      Handler : Timer_Handler);

   function Current_Handler (TM : Timer) return Timer_Handler;

   procedure Cancel_Handler

     (TM        : in out Timer;

      Cancelled : out Boolean);

   function Time_Remaining (TM : Timer) return Ada.Real_Time.Time_Span;

   Timer_Resource_Error : exception;

private

   type Timer (T : access Ada.Task_Identification.Task_Id) is

      tagged limited null record;

end Ada.Execution_Time.Timers;