[Xenomai-help] rt_task_bind() and timeout values

[Stefan Kisdaroczi <kisda@domain.hid>]

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Hi all,

If I call rt_task_bind() with a timeout value other than TM_NONBLOCK or TM_INFINITE
it works not as expected (by me).

System: Debian Lenny with Xenomai 2.4.3 and Kernel 2.6.24.

The attached example calls 3 times rt_task_bind() for a nonexistent task:

1. dont wait: rt_task_bind(&task,"SomeTaskName",TM_NONBLOCK)
   -> returns -11 (EWOULDBLOCK) -> OK

2. wait 5 secs: rt_task_bind(&task,"SomeTaskName",5000000000LL);
   -> returns immediately -13 (EACCES) without waiting -> ?
   -> I expected ETIMEDOUT after 5 seconds

3. wait forever: rt_task_bind(&task,"SomeTaskName",TM_INFINITE);
   -> blocks a expected -> OK

I have the same problem with rt_queue_bind() calls.

Do i expect something wrong?

Thanks for your help!

kisda


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#include <sys/mman.h>
#include <native/task.h>

RT_TASK mtask,task;

int main (int argc, char *argv[])

{
    int err;

    mlockall(MCL_CURRENT|MCL_FUTURE);

    err = rt_task_shadow(&mtask, NULL, 10, 0);

    if (err)
        fprintf(stderr,"rt_task_shadow failed, code %d\n",err);

    // 1. dont wait
    err = rt_task_bind(&task,"SomeTaskName",TM_NONBLOCK);

    if (err)
        fprintf(stderr,"bind (1) failed, code %d\n",err);

    // 2. wait 5 secs
    err = rt_task_bind(&task,"SomeTaskName",5000000000LL);

    if (err)
        fprintf(stderr,"bind (2) failed, code %d\n",err);

    // 3. wait forever
    err = rt_task_bind(&task,"SomeTaskName",TM_INFINITE);

    if (err)
        fprintf(stderr,"bind (3) failed, code %d\n",err);
}

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