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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) 1998-2009, 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 the DEC Unix version of this package

--  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.

with Interfaces.C; use Interfaces.C;

with System.Machine_Code; use System.Machine_Code;

package body System.OS_Interface is

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

   -- Get_Stack_Base --

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

   function Get_Stack_Base (thread : pthread_t) return Address is

      pragma Unreferenced (thread);

   begin

      return Null_Address;

   end Get_Stack_Base;

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

   -- pthread_init --

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

   procedure pthread_init is

   begin

      null;

   end pthread_init;

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

   -- pthread_self --

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

   function pthread_self return pthread_t is

      Self : pthread_t;

   begin

      Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &

           "bis $31, $0, %0",

           Outputs  => pthread_t'Asm_Output ("=r", Self),

           Clobber  => "$0",

           Volatile => True);

      return Self;

   end pthread_self;

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

   -- Hide_Yellow_Zone --

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

   procedure Hide_Unhide_Yellow_Zone (Hide : Boolean) is

      type Teb_Ptr is access all pthread_teb_t;

      Teb : Teb_Ptr;

      Res : Interfaces.C.int;

      pragma Unreferenced (Res);

   begin

      --  Get the Thread Environment Block address

      Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &

           "bis $31, $0, %0",

           Outputs  => Teb_Ptr'Asm_Output ("=r", Teb),

           Clobber  => "$0",

           Volatile => True);

      --  Stick a guard page right above the Yellow Zone if it exists

      if Teb.all.stack_yellow /= Teb.all.stack_guard then

         Res :=

           mprotect

             (Teb.all.stack_yellow, Get_Page_Size,

              prot => (if Hide then PROT_ON else PROT_OFF));

      end if;

   end Hide_Unhide_Yellow_Zone;

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

   -- 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_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;

end System.OS_Interface;