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

--                                                                          --

--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --

--                                                                          --

--                         A D A . R E A L _ T I M E                        --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--             Copyright (C) 1991-1994, Florida State University            --

--                     Copyright (C) 1995-2009, AdaCore                     --

--                                                                          --

-- GNARL 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 2,  or (at your option) any later ver- --

-- sion. GNARL 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.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNARL; see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University.       --

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

--                                                                          --

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

package body Ada.Real_Time is

   ---------

   -- "*" --

   ---------

   --  Note that Constraint_Error may be propagated

   function "*" (Left : Time_Span; Right : Integer) return Time_Span is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time_Span (Duration (Left) * Right);

   end "*";

   function "*" (Left : Integer; Right : Time_Span) return Time_Span is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time_Span (Left * Duration (Right));

   end "*";

   ---------

   -- "+" --

   ---------

   --  Note that Constraint_Error may be propagated

   function "+" (Left : Time; Right : Time_Span) return Time is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time (Duration (Left) + Duration (Right));

   end "+";

   function "+" (Left : Time_Span; Right : Time) return Time is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time (Duration (Left) + Duration (Right));

   end "+";

   function "+" (Left, Right : Time_Span) return Time_Span is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time_Span (Duration (Left) + Duration (Right));

   end "+";

   ---------

   -- "-" --

   ---------

   --  Note that Constraint_Error may be propagated

   function "-" (Left : Time; Right : Time_Span) return Time is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time (Duration (Left) - Duration (Right));

   end "-";

   function "-" (Left, Right : Time) return Time_Span is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time_Span (Duration (Left) - Duration (Right));

   end "-";

   function "-" (Left, Right : Time_Span) return Time_Span is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time_Span (Duration (Left) - Duration (Right));

   end "-";

   function "-" (Right : Time_Span) return Time_Span is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time_Span_Zero - Right;

   end "-";

   ---------

   -- "/" --

   ---------

   --  Note that Constraint_Error may be propagated

   function "/" (Left, Right : Time_Span) return Integer is

      pragma Unsuppress (Overflow_Check);

   begin

      return Integer (Duration (Left) / Duration (Right));

   end "/";

   function "/" (Left : Time_Span; Right : Integer) return Time_Span is

      pragma Unsuppress (Overflow_Check);

   begin

      return Time_Span (Duration (Left) / Right);

   end "/";

   -----------

   -- Clock --

   -----------

   function Clock return Time is

   begin

      return Time (System.Task_Primitives.Operations.Monotonic_Clock);

   end Clock;

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

   -- Microseconds --

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

   function Microseconds (US : Integer) return Time_Span is

   begin

      return Time_Span_Unit * US * 1_000;

   end Microseconds;

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

   -- Milliseconds --

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

   function Milliseconds (MS : Integer) return Time_Span is

   begin

      return Time_Span_Unit * MS * 1_000_000;

   end Milliseconds;

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

   -- Minutes --

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

   function Minutes (M : Integer) return Time_Span is

   begin

      return Milliseconds (M) * Integer'(60_000);

   end Minutes;

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

   -- Nanoseconds --

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

   function Nanoseconds (NS : Integer) return Time_Span is

   begin

      return Time_Span_Unit * NS;

   end Nanoseconds;

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

   -- Seconds --

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

   function Seconds (S : Integer) return Time_Span is

   begin

      return Milliseconds (S) * Integer'(1000);

   end Seconds;

   -----------

   -- Split --

   -----------

   procedure Split (T : Time; SC : out Seconds_Count; TS : out Time_Span) is

      T_Val : Time;

   begin

      --  Special-case for Time_First, whose absolute value is anomalous,

      --  courtesy of two's complement.

      T_Val := (if T = Time_First then abs (Time_Last) else abs (T));

      --  Extract the integer part of T, truncating towards zero

      SC :=

        (if T_Val < 0.5 then 0 else Seconds_Count (Time_Span'(T_Val - 0.5)));

      if T < 0.0 then

         SC := -SC;

      end if;

      --  If original time is negative, need to truncate towards negative

      --  infinity, to make TS non-negative, as per ARM.

      if Time (SC) > T then

         SC := SC - 1;

      end if;

      TS := Time_Span (Duration (T) - Duration (SC));

   end Split;

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

   -- Time_Of --

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

   function Time_Of (SC : Seconds_Count; TS : Time_Span) return Time is

   begin

      return Time (SC) + TS;

   end Time_Of;

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

   -- To_Duration --

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

   function To_Duration (TS : Time_Span) return Duration is

   begin

      return Duration (TS);

   end To_Duration;

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

   -- To_Time_Span --

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

   function To_Time_Span (D : Duration) return Time_Span is

   begin

      --  Note regarding AI-00432 requiring range checking on this conversion.

      --  In almost all versions of GNAT (and all to which this version of the

      --  Ada.Real_Time package apply), the range of Time_Span and Duration are

      --  the same, so there is no issue of overflow.

      return Time_Span (D);

   end To_Time_Span;

end Ada.Real_Time;