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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) 1999-2009, 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 LynxOS (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;

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

   -- clock_gettime --

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

   function clock_gettime

     (clock_id : clockid_t;

      tp       : access timespec)

      return     int

   is

      function clock_gettime_base

        (clock_id : clockid_t;

         tp       : access timespec)

         return     int;

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

   begin

      if clock_gettime_base (clock_id, tp) /= 0 then

         return errno;

      end if;

      return 0;

   end clock_gettime;

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

   -- 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

   begin

      return Interfaces.C.int (Prio);

   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 has negative value 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;

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

   -- POSIX.1c  Section 3 --

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

   function sigwait

     (set :  access sigset_t;

      sig :  access Signal)

      return int

   is

      function sigwait_base

        (set   : access sigset_t;

         value : System.Address)

         return  Signal;

      pragma Import (C, sigwait_base, "sigwait");

   begin

      sig.all := sigwait_base (set, Null_Address);

      if sig.all = -1 then

         return errno;

      end if;

      return 0;

   end sigwait;

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

   -- POSIX.1c  Section 11 --

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

   --  For all the following functions, LynxOS threads has the POSIX Draft 4

   --  behavior; it sets errno but the standard Posix requires it to be

   --  returned.

   function pthread_mutexattr_init

     (attr : access pthread_mutexattr_t)

      return int

   is

      function pthread_mutexattr_create

        (attr : access pthread_mutexattr_t)

         return int;

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

   begin

      if pthread_mutexattr_create (attr) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_mutexattr_init;

   function pthread_mutexattr_destroy

     (attr : access pthread_mutexattr_t)

      return int

   is

      function pthread_mutexattr_delete

        (attr : access pthread_mutexattr_t)

         return int;

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

   begin

      if pthread_mutexattr_delete (attr) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_mutexattr_destroy;

   function pthread_mutex_init

     (mutex : access pthread_mutex_t;

      attr  : access pthread_mutexattr_t)

      return  int

   is

      function pthread_mutex_init_base

        (mutex : access pthread_mutex_t;

         attr  : pthread_mutexattr_t)

         return  int;

      pragma Import (C, pthread_mutex_init_base, "pthread_mutex_init");

   begin

      if pthread_mutex_init_base (mutex, attr.all) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_mutex_init;

   function pthread_mutex_destroy

     (mutex : access pthread_mutex_t)

      return  int

   is

      function pthread_mutex_destroy_base

        (mutex : access pthread_mutex_t)

         return  int;

      pragma Import (C, pthread_mutex_destroy_base, "pthread_mutex_destroy");

   begin

      if pthread_mutex_destroy_base (mutex) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_mutex_destroy;

   function pthread_mutex_lock

     (mutex : access pthread_mutex_t)

      return  int

   is

      function pthread_mutex_lock_base

        (mutex : access pthread_mutex_t)

         return  int;

      pragma Import (C, pthread_mutex_lock_base, "pthread_mutex_lock");

   begin

      if pthread_mutex_lock_base (mutex) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_mutex_lock;

   function pthread_mutex_unlock

     (mutex : access pthread_mutex_t)

      return  int

   is

      function pthread_mutex_unlock_base

        (mutex : access pthread_mutex_t)

         return  int;

      pragma Import (C, pthread_mutex_unlock_base, "pthread_mutex_unlock");

   begin

      if pthread_mutex_unlock_base (mutex) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_mutex_unlock;

   function pthread_condattr_init

     (attr : access pthread_condattr_t)

      return int

   is

      function pthread_condattr_create

        (attr : access pthread_condattr_t)

         return int;

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

   begin

      if pthread_condattr_create (attr) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_condattr_init;

   function pthread_condattr_destroy

     (attr : access pthread_condattr_t)

      return int

   is

      function pthread_condattr_delete

        (attr : access pthread_condattr_t)

         return int;

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

   begin

      if pthread_condattr_delete (attr) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_condattr_destroy;

   function pthread_cond_init

     (cond : access pthread_cond_t;

      attr : access pthread_condattr_t)

      return int

   is

      function pthread_cond_init_base

        (cond : access pthread_cond_t;

         attr : pthread_condattr_t)

         return int;

      pragma Import (C, pthread_cond_init_base, "pthread_cond_init");

   begin

      if pthread_cond_init_base (cond, attr.all) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_cond_init;

   function pthread_cond_destroy

     (cond : access pthread_cond_t)

      return int

   is

      function pthread_cond_destroy_base

        (cond : access pthread_cond_t)

         return int;

      pragma Import (C, pthread_cond_destroy_base, "pthread_cond_destroy");

   begin

      if pthread_cond_destroy_base (cond) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_cond_destroy;

   function pthread_cond_signal

     (cond : access pthread_cond_t)

      return int

   is

      function pthread_cond_signal_base

        (cond : access pthread_cond_t)

         return int;

      pragma Import (C, pthread_cond_signal_base, "pthread_cond_signal");

   begin

      if pthread_cond_signal_base (cond) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_cond_signal;

   function pthread_cond_wait

     (cond  : access pthread_cond_t;

      mutex : access pthread_mutex_t)

      return  int

   is

      function pthread_cond_wait_base

        (cond  : access pthread_cond_t;

         mutex : access pthread_mutex_t)

         return  int;

      pragma Import (C, pthread_cond_wait_base, "pthread_cond_wait");

   begin

      if pthread_cond_wait_base (cond, mutex) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_cond_wait;

   function pthread_cond_timedwait

     (cond    : access pthread_cond_t;

      mutex   : access pthread_mutex_t;

      reltime : access timespec) return int

   is

      function pthread_cond_timedwait_base

        (cond    : access pthread_cond_t;

         mutex   : access pthread_mutex_t;

         reltime : access timespec) return int;

      pragma Import (C, pthread_cond_timedwait_base, "pthread_cond_timedwait");

   begin

      if pthread_cond_timedwait_base (cond, mutex, reltime) /= 0 then

         if errno = EAGAIN then

            return ETIMEDOUT;

         end if;

         return errno;

      end if;

      return 0;

   end pthread_cond_timedwait;

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

   -- POSIX.1c  Section 13 --

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

   function pthread_setschedparam

     (thread : pthread_t;

      policy : int;

      param  : access struct_sched_param)

      return   int

   is

      function pthread_setscheduler

        (thread : pthread_t;

         policy : int;

         prio   : int)

         return   int;

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

   begin

      if pthread_setscheduler (thread, policy, param.sched_priority) = -1 then

         return errno;

      end if;

      return 0;

   end pthread_setschedparam;

   function pthread_mutexattr_setprotocol

     (attr     : access pthread_mutexattr_t;

      protocol : int)

      return     int

   is

      pragma Unreferenced (attr, protocol);

   begin

      return 0;

   end pthread_mutexattr_setprotocol;

   function pthread_mutexattr_setprioceiling

     (attr        : access pthread_mutexattr_t;

      prioceiling : int)

      return        int

   is

      pragma Unreferenced (attr, prioceiling);

   begin

      return 0;

   end pthread_mutexattr_setprioceiling;

   function pthread_attr_setscope

     (attr            : access pthread_attr_t;

      contentionscope : int)

      return            int

   is

      pragma Unreferenced (attr, contentionscope);

   begin

      return 0;

   end pthread_attr_setscope;

   function sched_yield return int is

      procedure pthread_yield;

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

   begin

      pthread_yield;

      return 0;

   end sched_yield;

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

   --  P1003.1c - Section 16  --

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

   function pthread_attr_setdetachstate

     (attr        : access pthread_attr_t;

      detachstate : int)

      return        int

   is

      pragma Unreferenced (attr, detachstate);

   begin

      return 0;

   end pthread_attr_setdetachstate;

   function pthread_create

     (thread        : access pthread_t;

      attributes    : access pthread_attr_t;

      start_routine : Thread_Body;

      arg           : System.Address)

      return          int

   is

      --  The LynxOS pthread_create doesn't seems to work.

      --  Workaround : We're using st_new instead.

      --

      --   function pthread_create_base

      --     (thread        : access pthread_t;

      --      attributes    : pthread_attr_t;

      --      start_routine : Thread_Body;

      --      arg           : System.Address)

      --      return          int;

      --   pragma Import (C, pthread_create_base, "pthread_create");

      St : aliased st_t := attributes.st;

      function st_new

        (start_routine : Thread_Body;

         arg           : System.Address;

         attributes    : access st_t;

         thread        : access pthread_t)

         return          int;

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

   begin

      --  Following code would be used if above commented function worked

      --   if pthread_create_base

      --        (thread, attributes.all, start_routine, arg) /= 0 then

      if st_new (start_routine, arg, St'Access, thread) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_create;

   function pthread_detach (thread : pthread_t) return int is

      aliased_thread : aliased pthread_t := thread;

      function pthread_detach_base (thread : access pthread_t) return int;

      pragma Import (C, pthread_detach_base, "pthread_detach");

   begin

      if pthread_detach_base (aliased_thread'Access) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_detach;

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

   -- POSIX.1c  Section 17 --

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

   function pthread_setspecific

     (key   : pthread_key_t;

      value : System.Address)

      return  int

   is

      function pthread_setspecific_base

        (key   : pthread_key_t;

         value : System.Address)

         return  int;

      pragma Import (C, pthread_setspecific_base, "pthread_setspecific");

   begin

      if pthread_setspecific_base (key, value) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_setspecific;

   function pthread_getspecific (key : pthread_key_t) return System.Address is

      procedure pthread_getspecific_base

        (key   : pthread_key_t;

         value : access System.Address);

      pragma Import (C, pthread_getspecific_base, "pthread_getspecific");

      value : aliased System.Address := System.Null_Address;

   begin

      pthread_getspecific_base (key, value'Unchecked_Access);

      return value;

   end pthread_getspecific;

   function Get_Stack_Base (thread : pthread_t) return Address is

      pragma Warnings (Off, thread);

   begin

      return Null_Address;

   end Get_Stack_Base;

   function pthread_key_create

     (key        : access pthread_key_t;

      destructor : destructor_pointer)

      return       int

   is

      function pthread_keycreate

        (key        : access pthread_key_t;

         destructor : destructor_pointer)

         return       int;

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

   begin

      if pthread_keycreate (key, destructor) /= 0 then

         return errno;

      end if;

      return 0;

   end pthread_key_create;

   procedure pthread_init is

   begin

      null;

   end pthread_init;

end System.OS_Interface;