Thanks.
The mutex failed in the function pse51_mutex_trylock_internal, in the following
section (the printk is mine):
#if XENO_DEBUG(POSIX)
if (mutex->owningq != pse51_kqueues(mutex->attr.pshared))
{
printk ("mutex->owningq\n");
return EPERM;
}
#endif /* XENO_DEBUG(POSIX) */
I have XENO_DEBUG defined.
What does this mean?
(BTW, nothing I can do about those footers.)
-----Original Message-----
From: Gilles Chanteperdrix [mailto:[email protected]]
Sent: Tuesday, June 30, 2009 11:18 AM
To: Landau, Bracha
Cc: [email protected]
Subject: Re: [Xenomai-help] pthread_mutex_lock returns 1
Landau, Bracha wrote:
> Thanks for your help.
>
> I tried to put in "printk"s in the kernel implementation of the
> xenomai pthread_mutex_lock, and it did not work. Neither did xnprintf.
> I did this in order to find out what is the exact cause of the error;
> generally adding printk's in the kernel implementation of functions
> did work, but on this one it didn't.
That is because the implementation of the pthread_mutex_lock service is in
ksrc/skins/posix/syscall.c, and calls pse51_mutex_timedlock_break in
ksrc/skins/posix/mutex.c, pthread_mutex_lock implementation in
ksrc/skins/posix/mutex.c is only for kernel-space users. We had to split this
for correct handling of Linux signals.
>
> Is there any way to discern what exactly the problem is? This code was
> working on earlier versions of Xenomai (2.2) and did not generate an
> error on this instance of calling pthread_mutex_lock.
Ok, I have checked, 2.2 already had the pshared attribute, so I think your
issue is the other one (calling phtread_mutex services from non real-time
threads). Or maybe some other undocumented reason, which you should find by
adding printks... :-)
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Did I tell you that I found these footers stupid?
--
Gilles
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