------------------------------------------------------------------------------
--                                                                          --
--                         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) 2007-2012, 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.                                     --
--                                                                          --
--                                                                          --
--                                                                          --
--                                                                          --
--                                                                          --
-- 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 Bare Board version of this package

with Ada.Task_Identification;  use Ada.Task_Identification;
with Ada.Unchecked_Conversion;

with System.Tasking;
with System.Task_Primitives.Operations;
with System.OS_Interface; use System.OS_Interface;

with System.BB.Execution_Time;
with System.BB.Time;
with System.BB.Threads;

package body Ada.Execution_Time is

   package BB_Exec_Time renames System.BB.Execution_Time;

   function To_CPU_Time is new Ada.Unchecked_Conversion
     (System.BB.Time.Time, CPU_Time);
   --  Function to change the view from System.BB.Time.Time (unsigned 64-bit)
   --  to CPU_Time (unsigned 64-bit).
   --
   --  CPU_Time is derived from Ada.Real_Time.Time which is derived from
   --  System.BB.Time.Time. So CPU_Time and System.BB.Time.Time are the same
   --  type, but Ada.Real_Time.Time is private so we don't have visibility.

   ---------
   -- "+" --
   ---------

   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
      function To_Task_Id is new Ada.Unchecked_Conversion
        (Ada.Task_Identification.Task_Id, System.Tasking.Task_Id);

      Th : System.BB.Threads.Thread_Id;
   begin
      if T = Ada.Task_Identification.Null_Task_Id then
         raise Program_Error;
      end if;

      Th := System.Task_Primitives.Operations.Get_Thread_Id (To_Task_Id (T));

      return To_CPU_Time (BB_Exec_Time.Thread_Clock (Th));
   end Clock;

   -----------
   -- 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;

   --------------------------
   -- Clock_For_Interrupts --
   --------------------------

   function Clock_For_Interrupts return CPU_Time is
   begin
      return To_CPU_Time (BB_Exec_Time.Global_Interrupt_Clock);
   end Clock_For_Interrupts;

end Ada.Execution_Time;