163 lines
5.7 KiB
Ada
163 lines
5.7 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- 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) 1998-2015, 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 System.OS_Constants;
|
|
with Interfaces.C;
|
|
|
|
package body System.OS_Primitives is
|
|
|
|
use System.OS_Interface;
|
|
use type Interfaces.C.int;
|
|
|
|
package OSC renames System.OS_Constants;
|
|
|
|
------------------------
|
|
-- 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 (OSC.CLOCK_RT_Ada, TS'Unchecked_Access);
|
|
pragma Assert (Result = 0);
|
|
return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
|
|
end 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;
|