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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-osprim-darwin.adb] - Blame information for rev 414

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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
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--                                                                          --
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--                  S Y S T E M . O S _ P R I M I T I V E S                 --
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--                                                                          --
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--                                  B o d y                                 --
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--                                                                          --
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--          Copyright (C) 1998-2008, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNARL is free software; you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNARL was developed by the GNARL team at Florida State University.       --
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-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This version is for darwin
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package body System.OS_Primitives is
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   --  ??? These definitions are duplicated from System.OS_Interface
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   --  because we don't want to depend on any package. Consider removing
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   --  these declarations in System.OS_Interface and move these ones in
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   --  the spec.
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   type struct_timezone is record
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      tz_minuteswest  : Integer;
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      tz_dsttime   : Integer;
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   end record;
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   pragma Convention (C, struct_timezone);
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   type struct_timezone_ptr is access all struct_timezone;
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   type time_t is new Long_Integer;
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   type struct_timeval is record
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      tv_sec       : time_t;
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      tv_usec      : Integer;
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   end record;
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   pragma Convention (C, struct_timeval);
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   function gettimeofday
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     (tv : not null access struct_timeval;
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      tz : struct_timezone_ptr) return Integer;
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   pragma Import (C, gettimeofday, "gettimeofday");
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   type timespec is record
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      tv_sec  : time_t;
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      tv_nsec : Long_Integer;
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   end record;
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   pragma Convention (C, timespec);
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   function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
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   pragma Import (C, nanosleep, "nanosleep");
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   -----------
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   -- Clock --
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   -----------
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   function Clock return Duration is
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      TV     : aliased struct_timeval;
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      Result : Integer;
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      pragma Unreferenced (Result);
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   begin
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      --  The return codes for gettimeofday are as follows (from man pages):
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      --    EPERM  settimeofday is called by someone other than the superuser
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      --    EINVAL Timezone (or something else) is invalid
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      --    EFAULT One of tv or tz pointed outside accessible address space
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      --  None of these codes signal a potential clock skew, hence the return
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      --  value is never checked.
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      Result := gettimeofday (TV'Access, null);
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      return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
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   end Clock;
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   ---------------------
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   -- Monotonic_Clock --
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   ---------------------
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   function Monotonic_Clock return Duration renames Clock;
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   -----------------
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   -- To_Timespec --
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   -----------------
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   function To_Timespec (D : Duration) return timespec;
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   function To_Timespec (D : Duration) return timespec is
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      S : time_t;
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      F : Duration;
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   begin
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      S := time_t (Long_Long_Integer (D));
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      F := D - Duration (S);
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      --  If F has negative value due to a round-up, adjust for positive F
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      --  value.
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      if F < 0.0 then
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         S := S - 1;
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         F := F + 1.0;
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      end if;
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      return
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        timespec'(tv_sec  => S,
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                  tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
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   end To_Timespec;
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   -----------------
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   -- Timed_Delay --
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   -----------------
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   procedure Timed_Delay
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     (Time : Duration;
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      Mode : Integer)
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   is
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      Request    : aliased timespec;
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      Remaind    : aliased timespec;
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      Rel_Time   : Duration;
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      Abs_Time   : Duration;
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      Base_Time  : constant Duration := Clock;
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      Check_Time : Duration := Base_Time;
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      Result : Integer;
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      pragma Unreferenced (Result);
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   begin
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      if Mode = Relative then
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         Rel_Time := Time;
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         Abs_Time := Time + Check_Time;
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      else
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         Rel_Time := Time - Check_Time;
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         Abs_Time := Time;
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      end if;
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      if Rel_Time > 0.0 then
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         loop
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            Request := To_Timespec (Rel_Time);
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            Result := nanosleep (Request'Access, Remaind'Access);
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            Check_Time := Clock;
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            exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
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            Rel_Time := Abs_Time - Check_Time;
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         end loop;
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      end if;
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   end Timed_Delay;
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   ----------------
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   -- Initialize --
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   ----------------
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   procedure Initialize is
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   begin
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      null;
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   end Initialize;
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end System.OS_Primitives;

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