On Tue, 2007-03-13 at 15:51 +0100, M. Koehrer wrote:
> Hi all,
>
> I have a problem to catch segment violations with Xenomai:
> For demonstration I use the following program:
> ------------------------------------------
> #include <stdio.h>
> #include <sys/mman.h>
>
> #include <native/task.h>
> #include <native/sem.h>
> RT_TASK taska_desc;
> volatile int *pointer = 0;
>
> void mytaska(void *cookie)
> {
> int i;
> for (i=0; i < 50; i++)
> {
> rt_task_sleep(50000000);
> if (i > 20)
> {
> *pointer = 123;
> }
> printf("Hello %i\n", i);
> }
> printf("Hi, this is task A\n");
> }
>
> int main(void)
> {
> mlockall(MCL_CURRENT|MCL_FUTURE);
>
> rt_task_create(&taska_desc, "mytaska", 0, 81, T_JOINABLE);
> rt_task_start(&taska_desc, &mytaska, NULL);
>
> rt_task_join(&taska_desc);
> printf("Main: A joined\n");
>
> return 0;
> }
> ---------------------------------------
> Whenever i is greater than 20 a segment violation occurs, as I must not write
> to address 0 (the pointer is always NULL).
> However, what happens is, that my system freezes after printing out 18 or 19.
> I have to reset the PC to continue.
> When I write a printf() directly before the invalid assignment I get the
> usual linux
> "segmentation fault" error message.
This would be the the sign that a problem exists at the I-pipe level
with your current patch. The fault should have been propagated form
primary to secondary domain, and obviously it's not.
>
> How can I catch a signal in a Xenomai real time task?
>
There is no difference with any regular Linux application.
> I am running Xenomai 2.3.0 + NOCOW patch.
> I have enclosed the .c file and a Makefile in a .tgz file.
Can't reproduce the issue with 1.7-03 here.
Please make sure to use a recent and official I-pipe patch if it's not
already the case, and not a testing patch as published on this list, so
that we don't start chasing wild gooses.
http://download.gna.org/adeos/patches/v2.6/
> Thanks for any feedback on that issue
>
> Regards
>
> Mathias
> ~
> ~
>
>
>
> --
> Mathias Koehrer
> [EMAIL PROTECTED]
>
>
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--
Philippe.
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