Hi Michael,
Thank you for your email. I used RTLinux 2.2. Now the problem was solved
by changing the design, namely do the huge calculation in the user side
and send the result (huge blocks of data) to the RTLinux. Currently, I
updated to RTLinux 3.0.
with best
Dingrong
On Tue, 10 Apr 2001, Michael Barabanov wrote:
> > It seems to me that if the FIFO handler have a lot of things to do
> > will result in a segmentation fault of the user program (which
> > write to the FIFO and result in the running of the rtl FIFO
> > handler). I used some for loops witin the handler, the user
> > program works fine. But If I put some rtl_printf within
> > those for loops, the user program ends up with a segmentation fault.
> > When doing some more calculations instead of rtl_printf, the user
> > program ends up with the same segmentaion fault. My RTL thread
> > runs at 1khz rate. And my user program runs at 20Hz. Does these
> > frequencies explain the reason?
>
> What's the RTLinux version?
>
> >
> > As my user program was choked with a segmentatin fault, and left the
> > file (/dev/rtf12) descripter associated with the FIFO open,
> > without closing it. When I try to re-run the user program,
> > the device was busy, ...I
> > did not know how to solve this problem but deleted the /dev/rtf12 by
> > a mistake. Is there anybody there able to tell me how could I
> > recover /dev/rtf12 with crw-r--r-- mode?
>
> mknod /dev/rtf12 c 150 12
> chmod 644 /dev/rtf12
>
> Michael.
>
>
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