Re: [Xenomai-help] rt_mutex_acquire returns -3

[Philippe Gerum <rpm@xenomai.org>]

On Fri, 2009-08-14 at 09:31 +0200, Hans Søndergaard (HSO) wrote:
> I use objects of type:
> 
>  
> 
> typedef struct object {
> 
>   RT_MUTEX *rt_lock;
> 
>   ..
> 
> } Object;
> 
>  
> 
> int err = rt_mutex_create (ob->rt_lock, NULL);
> 
> printf ("[alloc.c]: rt_mutex_create err: %d; #%d \n", err, __LINE__);
> 
>  
> 
> err = rt_mutex_acquire (ob->rt_lock, TM_INFINITE);
> 
> printf ("[lock.c]: rt_mutex_acquire, err: %d; #%d \n", err, __LINE__);
> 
>  
> 
> On creation, rt_mutex_create returns 0 (as expected).
> 
> On acquiring, rt_mutex_acquire returns -3,
> 

-ESRCH. This means that for some reason, the internal handle copied by
rt_mutex_create() to ob->rt_lock could not be found back in the system
registry when calling rt_mutex_acquire().

Any chance ob->rt_lock may have been overwritten, or this mutex deleted
by another thread in the meantime?

In userland, RT_MUTEX is a structure containing an opaque long integer
value. Maybe you could check that value (printf("%ld",
ob->rt_lock.opaque)) right after rt_mutex_create() returns, and just
before rt_mutex_acquire() is invoked.

> but this return value is not included among the possible return values
> in the documentation of Mutex services.
> 
>  
> 
> Could you please explain what this return value -3 means?
> 
>  
> 
> Best regards
> 
> Hans So  
> 
>  
> 
>  
> 
> 
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-- 
Philippe.