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

--                                                                          --

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

--                                                                          --

--                   S Y S T E M . O S _ I N T E R F A C E                  --

--                                                                          --

--                                  B o d y                                 --

--                                                                          --

--          Copyright (C) 1997-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- 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 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/>.                                          --

--                                                                          --

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

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

--                                                                          --

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

--  This is a AIX (Native) version of this package

pragma Polling (Off);

--  Turn off polling, we do not want ATC polling to take place during tasking

--  operations. It causes infinite loops and other problems.

package body System.OS_Interface is

   use Interfaces.C;

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

   -- To_Duration --

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

   function To_Duration (TS : timespec) return Duration is

   begin

      return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;

   end To_Duration;

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

   -- To_Target_Priority --

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

   function To_Target_Priority

     (Prio : System.Any_Priority) return Interfaces.C.int

   is

      Dispatching_Policy : Character;

      pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");

      Time_Slice_Val : Integer;

      pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");

   begin

      --  For the case SCHED_OTHER the only valid priority across all supported

      --  versions of AIX is 1 (note that the scheduling policy can be set

      --  with the pragma Task_Dispatching_Policy or setting the time slice

      --  value). Otherwise, for SCHED_RR and SCHED_FIFO, the system defines

      --  priorities in the range 1 .. 127. This means that we must map

      --  System.Any_Priority in the range 0 .. 126 to 1 .. 127.

      if Dispatching_Policy = ' ' and then Time_Slice_Val < 0 then

         return 1;

      else

         return Interfaces.C.int (Prio) + 1;

      end if;

   end To_Target_Priority;

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

   -- To_Timespec --

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

   function To_Timespec (D : Duration) return timespec is

      S : time_t;

      F : Duration;

   begin

      S := time_t (Long_Long_Integer (D));

      F := D - Duration (S);

      --  If F is negative due to a round-up, adjust for positive F value

      if F < 0.0 then

         S := S - 1;

         F := F + 1.0;

      end if;

      return timespec'(tv_sec => S,

                       tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));

   end To_Timespec;

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

   -- clock_gettime --

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

   function clock_gettime

     (clock_id : clockid_t;

      tp       : access timespec)

      return     int

   is

      pragma Unreferenced (clock_id);

      --  Older AIX don't have clock_gettime, so use gettimeofday

      use Interfaces;

      type timeval is array (1 .. 2) of C.long;

      procedure timeval_to_duration

        (T    : not null access timeval;

         sec  : not null access C.long;

         usec : not null access C.long);

      pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");

      Micro  : constant := 10**6;

      sec    : aliased C.long;

      usec   : aliased C.long;

      TV     : aliased timeval;

      Result : int;

      function gettimeofday

        (Tv : access timeval;

         Tz : System.Address := System.Null_Address) return int;

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

   begin

      Result := gettimeofday (TV'Access, System.Null_Address);

      pragma Assert (Result = 0);

      timeval_to_duration (TV'Access, sec'Access, usec'Access);

      tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);

      return Result;

   end clock_gettime;

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

   -- sched_yield --

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

   --  AIX Thread does not have sched_yield;

   function sched_yield return int is

      procedure pthread_yield;

      pragma Import (C, pthread_yield, "sched_yield");

   begin

      pthread_yield;

      return 0;

   end sched_yield;

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

   -- Get_Stack_Base --

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

   function Get_Stack_Base (thread : pthread_t) return Address is

      pragma Warnings (Off, thread);

   begin

      return Null_Address;

   end Get_Stack_Base;

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

   -- PTHREAD_PRIO_INHERIT --

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

   AIX_Version : Integer := 0;

   --  AIX version in the form xy for AIX version x.y (0 means not set)

   SYS_NMLN : constant := 32;

   --  AIX system constant used to define utsname, see sys/utsname.h

   subtype String_NMLN is String (1 .. SYS_NMLN);

   type utsname is record

      sysname    : String_NMLN;

      nodename   : String_NMLN;

      release    : String_NMLN;

      version    : String_NMLN;

      machine    : String_NMLN;

      procserial : String_NMLN;

   end record;

   pragma Convention (C, utsname);

   procedure uname (name : out utsname);

   pragma Import (C, uname);

   function PTHREAD_PRIO_INHERIT return int is

      name : utsname;

      function Val (C : Character) return Integer;

      --  Transform a numeric character ('0' .. '9') to an integer

      ---------

      -- Val --

      ---------

      function Val (C : Character) return Integer is

      begin

         return Character'Pos (C) - Character'Pos ('0');

      end Val;

   --  Start of processing for PTHREAD_PRIO_INHERIT

   begin

      if AIX_Version = 0 then

         --  Set AIX_Version

         uname (name);

         AIX_Version := Val (name.version (1)) * 10 + Val (name.release (1));

      end if;

      if AIX_Version < 53 then

         --  Under AIX < 5.3, PTHREAD_PRIO_INHERIT is defined as 0 in pthread.h

         return 0;

      else

         --  Under AIX >= 5.3, PTHREAD_PRIO_INHERIT is defined as 3

         return 3;

      end if;

   end PTHREAD_PRIO_INHERIT;

end System.OS_Interface;