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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-osprim-vxworks.adb] - Rev 282
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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . O S _ P R I M I T I V E S -- -- -- -- 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 version is for VxWorks targets with System.OS_Interface; -- Since the thread library is part of the VxWorks kernel, using OS_Interface -- is not a problem here, as long as we only use System.OS_Interface as a -- set of C imported routines: using Ada routines from this package would -- create a dependency on libgnarl in libgnat, which is not desirable. with Interfaces.C; package body System.OS_Primitives is use System.OS_Interface; use type Interfaces.C.int; ------------------------ -- Internal functions -- ------------------------ function To_Clock_Ticks (D : Duration) return int; -- Convert a duration value (in seconds) into clock ticks. -- Note that this routine is duplicated from System.OS_Interface since -- as explained above, we do not want to depend on libgnarl 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 -1; 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; ----------- -- Clock -- ----------- function Clock return Duration is TS : aliased timespec; Result : int; begin Result := clock_gettime (CLOCK_REALTIME, TS'Unchecked_Access); pragma Assert (Result = 0); return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9; end Clock; --------------------- -- Monotonic_Clock -- --------------------- function Monotonic_Clock return Duration renames Clock; ----------------- -- Timed_Delay -- ----------------- procedure Timed_Delay (Time : Duration; Mode : Integer) is Rel_Time : Duration; Abs_Time : Duration; Base_Time : constant Duration := Clock; Check_Time : Duration := Base_Time; Ticks : int; Result : int; pragma Unreferenced (Result); begin if Mode = Relative then Rel_Time := Time; Abs_Time := Time + Check_Time; else Rel_Time := Time - Check_Time; Abs_Time := Time; end if; if Rel_Time > 0.0 then loop Ticks := To_Clock_Ticks (Rel_Time); if Mode = Relative and then Ticks < int'Last then -- The first tick will delay anytime between 0 and -- 1 / sysClkRateGet seconds, so we need to add one to -- be on the safe side. Ticks := Ticks + 1; end if; Result := taskDelay (Ticks); Check_Time := Clock; exit when Abs_Time <= Check_Time or else Check_Time < Base_Time; Rel_Time := Abs_Time - Check_Time; end loop; end if; end Timed_Delay; ---------------- -- Initialize -- ---------------- procedure Initialize is begin null; end Initialize; end System.OS_Primitives;
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