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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

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

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--         Copyright (C) 2007-2011, Free Software Foundation, Inc.          --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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

--  This is the Windows native version of this package

with Ada.Task_Identification;           use Ada.Task_Identification;

with Ada.Unchecked_Conversion;

with System.OS_Interface;               use System.OS_Interface;

with System.Task_Primitives.Operations; use System.Task_Primitives.Operations;

with System.Tasking;                    use System.Tasking;

with System.Win32;                      use System.Win32;

package body Ada.Execution_Time is

   ---------

   -- "+" --

   ---------

   function "+"

     (Left  : CPU_Time;

      Right : Ada.Real_Time.Time_Span) return CPU_Time

   is

      use type Ada.Real_Time.Time;

   begin

      return CPU_Time (Ada.Real_Time.Time (Left) + Right);

   end "+";

   function "+"

     (Left  : Ada.Real_Time.Time_Span;

      Right : CPU_Time) return CPU_Time

   is

      use type Ada.Real_Time.Time;

   begin

      return CPU_Time (Left + Ada.Real_Time.Time (Right));

   end "+";

   ---------

   -- "-" --

   ---------

   function "-"

     (Left  : CPU_Time;

      Right : Ada.Real_Time.Time_Span) return CPU_Time

   is

      use type Ada.Real_Time.Time;

   begin

      return CPU_Time (Ada.Real_Time.Time (Left) - Right);

   end "-";

   function "-"

     (Left  : CPU_Time;

      Right : CPU_Time) return Ada.Real_Time.Time_Span

   is

      use type Ada.Real_Time.Time;

   begin

      return (Ada.Real_Time.Time (Left) - Ada.Real_Time.Time (Right));

   end "-";

   -----------

   -- Clock --

   -----------

   function Clock

     (T : Ada.Task_Identification.Task_Id :=

            Ada.Task_Identification.Current_Task) return CPU_Time

   is

      Hundreds_Nano_In_Sec : constant Long_Long_Float := 1.0E7;

      function To_Time is new Ada.Unchecked_Conversion

        (Duration, Ada.Real_Time.Time);

      function To_Task_Id is new Ada.Unchecked_Conversion

        (Ada.Task_Identification.Task_Id, System.Tasking.Task_Id);

      C_Time : aliased Long_Long_Integer;

      E_Time : aliased Long_Long_Integer;

      K_Time : aliased Long_Long_Integer;

      U_Time : aliased Long_Long_Integer;

      Res    : BOOL;

   begin

      if T = Ada.Task_Identification.Null_Task_Id then

         raise Program_Error;

      end if;

      Res :=

        GetThreadTimes

          (HANDLE (Get_Thread_Id (To_Task_Id (T))),

           C_Time'Access, E_Time'Access, K_Time'Access, U_Time'Access);

      if Res = System.Win32.FALSE then

         raise Program_Error;

      end if;

      return

        CPU_Time

          (To_Time

             (Duration

                ((Long_Long_Float (K_Time) / Hundreds_Nano_In_Sec)

                 + (Long_Long_Float (U_Time) / Hundreds_Nano_In_Sec))));

   end Clock;

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

   -- Clock_For_Interrupts --

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

   function Clock_For_Interrupts return CPU_Time is

   begin

      --  According to AI 0170-1, D.14(18.1/3), if Interrupt_Clocks_Supported

      --  is set to False the function raises Program_Error.

      raise Program_Error;

      return CPU_Time_First;

   end Clock_For_Interrupts;

   -----------

   -- Split --

   -----------

   procedure Split

     (T  : CPU_Time;

      SC : out Ada.Real_Time.Seconds_Count;

      TS : out Ada.Real_Time.Time_Span)

   is

      use type Ada.Real_Time.Time;

   begin

      Ada.Real_Time.Split (Ada.Real_Time.Time (T), SC, TS);

   end Split;

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

   -- Time_Of --

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

   function Time_Of

     (SC : Ada.Real_Time.Seconds_Count;

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

      return CPU_Time

   is

   begin

      return CPU_Time (Ada.Real_Time.Time_Of (SC, TS));

   end Time_Of;

end Ada.Execution_Time;