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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-osprim-vxworks.adb] - Blame information for rev 706

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1 706 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) 1998-2011, 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 VxWorks targets
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with System.OS_Interface;
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--  Since the thread library is part of the VxWorks kernel, using OS_Interface
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--  is not a problem here, as long as we only use System.OS_Interface as a
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--  set of C imported routines: using Ada routines from this package would
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--  create a dependency on libgnarl in libgnat, which is not desirable.
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with System.OS_Constants;
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with Interfaces.C;
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package body System.OS_Primitives is
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   use System.OS_Interface;
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   use type Interfaces.C.int;
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   package OSC renames System.OS_Constants;
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   ------------------------
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   -- Internal functions --
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   ------------------------
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   function To_Clock_Ticks (D : Duration) return int;
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   --  Convert a duration value (in seconds) into clock ticks.
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   --  Note that this routine is duplicated from System.OS_Interface since
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   --  as explained above, we do not want to depend on libgnarl
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   function To_Clock_Ticks (D : Duration) return int is
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      Ticks          : Long_Long_Integer;
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      Rate_Duration  : Duration;
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      Ticks_Duration : Duration;
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   begin
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      if D < 0.0 then
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         return -1;
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      end if;
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      --  Ensure that the duration can be converted to ticks
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      --  at the current clock tick rate without overflowing.
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      Rate_Duration := Duration (sysClkRateGet);
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      if D > (Duration'Last / Rate_Duration) then
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         Ticks := Long_Long_Integer (int'Last);
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      else
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         Ticks_Duration := D * Rate_Duration;
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         Ticks := Long_Long_Integer (Ticks_Duration);
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         if Ticks_Duration > Duration (Ticks) then
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            Ticks := Ticks + 1;
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         end if;
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         if Ticks > Long_Long_Integer (int'Last) then
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            Ticks := Long_Long_Integer (int'Last);
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         end if;
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      end if;
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      return int (Ticks);
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   end To_Clock_Ticks;
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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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      TS     : aliased timespec;
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      Result : int;
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   begin
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      Result := clock_gettime (OSC.CLOCK_RT_Ada, TS'Unchecked_Access);
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      pragma Assert (Result = 0);
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      return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
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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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   -- 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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      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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      Ticks      : int;
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      Result     : int;
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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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            Ticks := To_Clock_Ticks (Rel_Time);
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            if Mode = Relative and then Ticks < int'Last then
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               --  The first tick will delay anytime between 0 and
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               --  1 / sysClkRateGet seconds, so we need to add one to
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               --  be on the safe side.
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               Ticks := Ticks + 1;
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            end if;
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            Result := taskDelay (Ticks);
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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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