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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;