[Xenomai-help] I/O privilege losted and killed message

["Nicolas BLANCHARD" <n.blanchard@domain.hid>]

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Hello,

Sometime i lose my i/o privilege put with the system call ioperm (in
the main function of my program).

My application stop with a "killed" message in the console and  in
/proc/xenomai/fault i've an "general fault".
To ignore this problem, i use the call system iopl (with full
privilege) or recall ioperm before each inb or outb.
But there is a problem, why i/o privilege are losted ?

In attachment you can find an archive with an example (application and
source) witch show the problem.
This program has 2 task :
- task_1 priority 23 period 100 ms, lock a mutex, access to /dev/rtc,
unlock the mutex, outb on hardware.
- task 2 priority 25 period 1 ms, do nothing !

I put a 1 ms period to task_2 because it's near the speedest period on
my cpu (166 MHz).
With this period it stop immediatly.
If i put 10 ms it's need 1 or 2 minutes.

On my Pentium 4 (Ubuntu on VmWare worstation under WindowsXP), i put 30
ms (the more speed before overrun).

If i use iopl (and not ioperm), no problem.
If i just have task_1, no problem.
If i don't use mutex (lock for Rtc access) on task_2, no problem.

I use Xenomai Xenomai 2.3-rc2 (adeos 1.5-02), same probleme with
2.2.3.

If you have an idea.

thanks
nicolas blanchard


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