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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

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

--                                                                          --

--                                 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. --

--                                                                          --

------------------------------------------------------------------------------

--  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 Ada.Task_Identification;

with Ada.Real_Time;

package Ada.Execution_Time is

   pragma Preelaborate;

   pragma Unimplemented_Unit;

   type CPU_Time is private;

   CPU_Time_First : constant CPU_Time;

   CPU_Time_Last  : constant CPU_Time;

   CPU_Time_Unit  : constant := 0.000001;

   CPU_Tick       : constant Ada.Real_Time.Time_Span;

   function Clock

     (T : Ada.Task_Identification.Task_Id :=

            Ada.Task_Identification.Current_Task)

      return CPU_Time;

   function "+"

     (Left  : CPU_Time;

      Right : Ada.Real_Time.Time_Span) return CPU_Time;

   function "+"

     (Left  : Ada.Real_Time.Time_Span;

      Right : CPU_Time) return CPU_Time;

   function "-"

     (Left  : CPU_Time;

      Right : Ada.Real_Time.Time_Span) return CPU_Time;

   function "-"

     (Left  : CPU_Time;

      Right : CPU_Time) return Ada.Real_Time.Time_Span;

   function "<"  (Left, Right : CPU_Time) return Boolean;

   function "<=" (Left, Right : CPU_Time) return Boolean;

   function ">"  (Left, Right : CPU_Time) return Boolean;

   function ">=" (Left, Right : CPU_Time) return Boolean;

   procedure Split

     (T  : CPU_Time;

      SC : out Ada.Real_Time.Seconds_Count;

      TS : out Ada.Real_Time.Time_Span);

   function Time_Of

      (SC : Ada.Real_Time.Seconds_Count;

       TS : Ada.Real_Time.Time_Span := Ada.Real_Time.Time_Span_Zero)

       return CPU_Time;

   Interrupt_Clocks_Supported          : constant Boolean := False;

   Separate_Interrupt_Clocks_Supported : constant Boolean := False;

   function Clock_For_Interrupts return CPU_Time;

private

   type CPU_Time is new Ada.Real_Time.Time;

   CPU_Time_First : constant CPU_Time  := CPU_Time (Ada.Real_Time.Time_First);

   CPU_Time_Last  : constant CPU_Time  := CPU_Time (Ada.Real_Time.Time_Last);

   CPU_Tick : constant Ada.Real_Time.Time_Span := Ada.Real_Time.Tick;

end Ada.Execution_Time;