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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 POSIX (Realtime Extension) version of this package

with Ada.Task_Identification;  use Ada.Task_Identification;

with Ada.Unchecked_Conversion;

with System.OS_Constants; use System.OS_Constants;

with System.OS_Interface; use System.OS_Interface;

with Interfaces.C; use Interfaces.C;

package body Ada.Execution_Time is

   pragma Linker_Options ("-lrt");

   --  POSIX.1b Realtime Extensions library. Needed to have access to function

   --  clock_gettime.

   ---------

   -- "+" --

   ---------

   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

      TS     : aliased timespec;

      Result : Interfaces.C.int;

      function To_CPU_Time is

        new Ada.Unchecked_Conversion (Duration, CPU_Time);

      --  Time is equal to Duration (although it is a private type) and

      --  CPU_Time is equal to Time.

      function clock_gettime

        (clock_id : Interfaces.C.int;

         tp       : access timespec)

         return int;

      pragma Import (C, clock_gettime, "clock_gettime");

      --  Function from the POSIX.1b Realtime Extensions library

   begin

      if T = Ada.Task_Identification.Null_Task_Id then

         raise Program_Error;

      end if;

      Result := clock_gettime

        (clock_id => CLOCK_THREAD_CPUTIME_ID, tp => TS'Unchecked_Access);

      pragma Assert (Result = 0);

      return To_CPU_Time (To_Duration (TS));

   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;