208 lines
6.9 KiB
Ada
208 lines
6.9 KiB
Ada
------------------------------------------------------------------------------
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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 _ I N T E R F A C E --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1997-2006 Free Software Foundation --
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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, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, 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. --
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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 is the VxWorks version.
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-- This package encapsulates all direct interfaces to OS services
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-- that are needed by children of System.
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pragma Polling (Off);
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-- Turn off polling, we do not want ATC polling to take place during
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-- tasking operations. It causes infinite loops and other problems.
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package body System.OS_Interface is
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use type Interfaces.C.int;
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Low_Priority : constant := 255;
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-- VxWorks native (default) lowest scheduling priority.
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------------
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-- getpid --
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------------
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function getpid return t_id is
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begin
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-- VxWorks 5 (and VxWorks 6 in kernel mode) does not have a getpid
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-- function. taskIdSelf is the equivalent routine.
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return taskIdSelf;
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end getpid;
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----------
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-- kill --
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----------
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function kill (pid : t_id; sig : Signal) return int is
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function c_kill (pid : t_id; sig : Signal) return int;
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pragma Import (C, c_kill, "kill");
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begin
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return c_kill (pid, sig);
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end kill;
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--------------------
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-- Set_Time_Slice --
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--------------------
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function Set_Time_Slice (ticks : int) return int is
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function kernelTimeSlice (ticks : int) return int;
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pragma Import (C, kernelTimeSlice, "kernelTimeSlice");
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begin
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return kernelTimeSlice (ticks);
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end Set_Time_Slice;
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-------------
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-- sigwait --
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-------------
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function sigwait
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(set : access sigset_t;
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sig : access Signal) return int
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is
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Result : int;
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function sigwaitinfo
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(set : access sigset_t; sigvalue : System.Address) return int;
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pragma Import (C, sigwaitinfo, "sigwaitinfo");
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begin
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Result := sigwaitinfo (set, System.Null_Address);
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if Result /= -1 then
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sig.all := Signal (Result);
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return 0;
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else
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sig.all := 0;
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return errno;
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end if;
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end sigwait;
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-----------------
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-- To_Duration --
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-----------------
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function To_Duration (TS : timespec) return Duration is
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begin
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return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
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end To_Duration;
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-----------------
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-- To_Timespec --
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-----------------
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function To_Timespec (D : Duration) return timespec is
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S : time_t;
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F : Duration;
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begin
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S := time_t (Long_Long_Integer (D));
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F := D - Duration (S);
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-- If F has negative value due to a round-up, adjust for positive F
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-- value.
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if F < 0.0 then
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S := S - 1;
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F := F + 1.0;
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end if;
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return timespec'(ts_sec => S,
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ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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end To_Timespec;
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-------------------------
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-- To_VxWorks_Priority --
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-------------------------
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function To_VxWorks_Priority (Priority : in int) return int is
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begin
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return Low_Priority - Priority;
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end To_VxWorks_Priority;
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--------------------
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-- To_Clock_Ticks --
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--------------------
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-- ??? - For now, we'll always get the system clock rate
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-- since it is allowed to be changed during run-time in
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-- VxWorks. A better method would be to provide an operation
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-- to set it that so we can always know its value.
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--
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-- Another thing we should probably allow for is a resultant
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-- tick count greater than int'Last. This should probably
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-- be a procedure with two output parameters, one in the
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-- range 0 .. int'Last, and another representing the overflow
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-- count.
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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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-- VX_FP_TASK --
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----------------
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function VX_FP_TASK return int is
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begin
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return 16#0008#;
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end VX_FP_TASK;
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end System.OS_Interface;
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