+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA 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 --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1998-2001 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 2, or (at your option) any later ver- --
--- sion. GNARL 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- 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;
--- used for type int
-
-package body System.OS_Primitives is
-
- use System.OS_Interface;
-
- --------------------------
- -- 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
- -- 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
- -- We always want to round up to the nearest clock tick.
-
- 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;
-
- use type Interfaces.C.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
- Result : int;
- Rel_Time : Duration;
- Abs_Time : Duration;
- Check_Time : Duration := Clock;
-
- 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
- Result := taskDelay (To_Clock_Ticks (Rel_Time));
- Check_Time := Clock;
-
- exit when Abs_Time <= Check_Time;
-
- Rel_Time := Abs_Time - Check_Time;
- end loop;
- end if;
- end Timed_Delay;
-
-end System.OS_Primitives;
projects / msp430-gcc.git / blobdiff