147 lines
5.6 KiB
Ada
147 lines
5.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNU ADA 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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-- $Revision: 1.7 $
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-- --
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-- Copyright (C) 1998-2001 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 2, or (at your option) any later ver- --
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-- sion. GNARL 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. It is --
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-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
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-- State University (http://www.gnat.com). --
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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 Interfaces.C;
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-- used for type int
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package body System.OS_Primitives is
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use System.OS_Interface;
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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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-- 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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-- We always want to round up to the nearest clock tick.
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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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use type Interfaces.C.int;
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begin
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Result := clock_gettime (CLOCK_REALTIME, 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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Result : int;
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Rel_Time : Duration;
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Abs_Time : Duration;
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Check_Time : Duration := Clock;
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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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Result := taskDelay (To_Clock_Ticks (Rel_Time));
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Check_Time := Clock;
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exit when Abs_Time <= Check_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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end System.OS_Primitives;
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