On Tue, May 13, 2008 at 5:51 AM, Breno Carneiro Pinheiro
<[EMAIL PROTECTED]> wrote:
> Hi all, I wanna some help with my application. I'm learning about Xenomai
> POSIX and Native API. I wonder know what is wrong with my code below because
> both don't worked out:
>
> POSIX:
>
> #include <sys/mman.h>
>
> #include <posix/pthread.h>
> #include <posix/time.h>
This should be:
#include <pthread.h>
#include <time.h>
If you want your application to be portable accross posix implementations.
>
> #include <stdio.h>
>
> static pthread_t task_desc;
> void task_body (void *cookie)
> {
> struct timespec time;
> clock_gettime(CLOCK_MONOTONIC, &time);;
> pthread_make_periodic_np(pthread_self(),&time, 1000000000);
Bad arguments type passed to pthread_make_periodic_np, read its
prototype in Xenomai online documentation. You should get a compiler
warning here, and if you do not get a compiler warning, then you are
not compiling with sufficient warnings, try -Wall or even -Wall -W. My
favorite is -Wall -W -Werror-implicit-function-declaration.
> while(1) {
> printf("%s\n","a");
missing pthread_wait_period_np. And in fact, you should not be using
pthread_make_periodic_np/pthread_wait_period_np at all since they are
rtlinux extensions to the posix interface and are implemented in
Xenomai posix skin only for compatibility with rtlinux, you should be
using clock_nanosleep.
Also, using printf in a real-time loop is not a good idea.
> }
> }
>
> int main (int argc, char *argv[])
>
> {
> int ret;
> pthread_attr_t thattr;
>
Missing mlockall (unless you configured xenomai with --enable-posix-mlockall).
> pthread_attr_init(&thattr);
> pthread_attr_setdetachstate(&thattr, 0);
> pthread_attr_setstacksize(&thattr, 1024);
Much too small, especially since you use printf which requires some
space on the stack. Use 65536 instead of 1024 for instance.
Also, since the thread you create is a real-time thread you should
give it a real-time priority, i.e. use the SCHED_FIFO policy with a
priority between 1 and 99.
> ret = pthread_create(&task_desc, NULL, &task_body, NULL);
You initialized a thread attribute structure and do not use it.
>
> if(!ret)
> pthread_join(task_desc, NULL);
>
> }
>
--
Gilles
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