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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) 1997-2010, 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 the VxWorks version

--  This package encapsulates all direct interfaces to OS services that are

--  needed by children of System.

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 type Interfaces.C.int;

   Low_Priority : constant := 255;

   --  VxWorks native (default) lowest scheduling priority

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

   -- sigwait --

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

   function sigwait

     (set : access sigset_t;

      sig : access Signal) return int

   is

      Result : int;

      function sigwaitinfo

        (set : access sigset_t; sigvalue : System.Address) return int;

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

   begin

      Result := sigwaitinfo (set, System.Null_Address);

      if Result /= -1 then

         sig.all := Signal (Result);

         return OK;

      else

         sig.all := 0;

         return errno;

      end if;

   end sigwait;

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

   -- To_Duration --

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

   function To_Duration (TS : timespec) return Duration is

   begin

      return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;

   end To_Duration;

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

   -- 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'(ts_sec  => S,

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

   end To_Timespec;

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

   -- To_VxWorks_Priority --

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

   function To_VxWorks_Priority (Priority : int) return int is

   begin

      return Low_Priority - Priority;

   end To_VxWorks_Priority;

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

   -- To_Clock_Ticks --

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

   --  ??? - For now, we'll always get the system clock rate since it is

   --  allowed to be changed during run-time in VxWorks. A better method would

   --  be to provide an operation to set it that so we can always know its

   --  value.

   --  Another thing we should probably allow for is a resultant tick count

   --  greater than int'Last. This should probably be a procedure with two

   --  output parameters, one in the range 0 .. int'Last, and another

   --  representing the overflow count.

   function To_Clock_Ticks (D : Duration) return int is

      Ticks          : Long_Long_Integer;

      Rate_Duration  : Duration;

      Ticks_Duration : Duration;

   begin

      if D < 0.0 then

         return ERROR;

      end if;

      --  Ensure that the duration can be converted to ticks

      --  at the current clock tick rate without overflowing.

      Rate_Duration := Duration (sysClkRateGet);

      if D > (Duration'Last / Rate_Duration) then

         Ticks := Long_Long_Integer (int'Last);

      else

         Ticks_Duration := D * Rate_Duration;

         Ticks := Long_Long_Integer (Ticks_Duration);

         if Ticks_Duration > Duration (Ticks) then

            Ticks := Ticks + 1;

         end if;

         if Ticks > Long_Long_Integer (int'Last) then

            Ticks := Long_Long_Integer (int'Last);

         end if;

      end if;

      return int (Ticks);

   end To_Clock_Ticks;

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

   -- Binary_Semaphore_Create --

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

   function Binary_Semaphore_Create return Binary_Semaphore_Id is

   begin

      return Binary_Semaphore_Id (semBCreate (SEM_Q_FIFO, SEM_EMPTY));

   end Binary_Semaphore_Create;

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

   -- Binary_Semaphore_Delete --

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

   function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int is

   begin

      return semDelete (SEM_ID (ID));

   end Binary_Semaphore_Delete;

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

   -- Binary_Semaphore_Obtain --

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

   function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int is

   begin

      return semTake (SEM_ID (ID), WAIT_FOREVER);

   end Binary_Semaphore_Obtain;

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

   -- Binary_Semaphore_Release --

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

   function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int is

   begin

      return semGive (SEM_ID (ID));

   end Binary_Semaphore_Release;

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

   -- Binary_Semaphore_Flush --

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

   function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int is

   begin

      return semFlush (SEM_ID (ID));

   end Binary_Semaphore_Flush;

   ----------

   -- kill --

   ----------

   function kill (pid : t_id; sig : Signal) return int is

   begin

      return System.VxWorks.Ext.kill (pid, int (sig));

   end kill;

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

   -- Interrupt_Connect --

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

   function Interrupt_Connect

     (Vector    : Interrupt_Vector;

      Handler   : Interrupt_Handler;

      Parameter : System.Address := System.Null_Address) return int is

   begin

      return

        System.VxWorks.Ext.Interrupt_Connect

        (System.VxWorks.Ext.Interrupt_Vector (Vector),

         System.VxWorks.Ext.Interrupt_Handler (Handler),

         Parameter);

   end Interrupt_Connect;

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

   -- Interrupt_Context --

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

   function Interrupt_Context return int is

   begin

      return System.VxWorks.Ext.Interrupt_Context;

   end Interrupt_Context;

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

   -- Interrupt_Number_To_Vector --

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

   function Interrupt_Number_To_Vector

     (intNum : int) return Interrupt_Vector

   is

   begin

      return Interrupt_Vector

        (System.VxWorks.Ext.Interrupt_Number_To_Vector (intNum));

   end Interrupt_Number_To_Vector;

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

   -- Current_CPU --

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

   function Current_CPU return Multiprocessors.CPU is

   begin

      --  ??? Should use vxworks multiprocessor interface

      return Multiprocessors.CPU'First;

   end Current_CPU;

end System.OS_Interface;