[Xenomai] Debian Bug#678695: Xenomai posix skin : bug with pthread_mutex_trylock function

[Xenomai] Debian Bug#678695: Xenomai posix skin : bug with pthread_mutex_trylock function

[Roland Stigge]

Hi,

I'm forwarding an issue reported to Debian, see below. For further
questions, just ask, and see also:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=678695

Thanks,

Roland


=================================================================
Original Report (the report at the above link contains the example file):

Package: xenomai
Version: 2.6.0

Kernel:2.6.38.8 - Xenomai:2.6.0
arch:i686 i386 GNU/Linux

Hi,

The attached code shows a malfunction of the pthread_mutex_trylock function.


Description of test.c:
The main task takes the mutex during 1second while the 't1' task tries
to take this mutex from 0.5sc.
We can notice that with the posix skin of xenomai, t1 never succeeded to
take the mutex, which is not the case without the posix skin of xenomai.



Duchesne Alexandre
duch.alexandre@gmail.com

Re: [Xenomai] Debian Bug#678695: Xenomai posix skin : bug with pthread_mutex_trylock function

[Gilles Chanteperdrix]

On 06/24/2012 01:12 PM, Roland Stigge wrote:
> Original Report (the report at the above link contains the example file):
> 
> Package: xenomai
> Version: 2.6.0
> 
> Kernel:2.6.38.8 - Xenomai:2.6.0
> arch:i686 i386 GNU/Linux
> 
> Hi,
> 
> The attached code shows a malfunction of the pthread_mutex_trylock function.
> 
> 
> Description of test.c:
> The main task takes the mutex during 1second while the 't1' task tries
> to take this mutex from 0.5sc.
> We can notice that with the posix skin of xenomai, t1 never succeeded to
> take the mutex, which is not the case without the posix skin of xenomai.
> 
> 
> 
> Duchesne Alexandre
> duch.alexandre@gmail.com

pthread_mutex_trylock is know to be broken in Xenomai 2.6.0, this has 
been fixed in xenomai current development branch. See patches:
http://git.xenomai.org/?p=xenomai-2.6.git;a=commitdiff;h=a0822a77ba383dac832253e6f0ca3431860a5661;hp=b3af76a4dc4cc2282fb83cdfeb9c454a1242a125
http://git.xenomai.org/?p=xenomai-2.6.git;a=commitdiff;h=de094a9e580511eb2dfdc0cee78bf92c959e2c55;hp=28256f3937c80f25fd6f49394a4ffb5d7b3179c7

-- 
                                                                Gilles.

Re: [Xenomai] Debian Bug#678695: Xenomai posix skin : bug with pthread_mutex_trylock function

[Gilles Chanteperdrix]

On 06/24/2012 01:56 PM, Gilles Chanteperdrix wrote:
> On 06/24/2012 01:12 PM, Roland Stigge wrote:
>> Original Report (the report at the above link contains the example file):
>>
>> Package: xenomai
>> Version: 2.6.0
>>
>> Kernel:2.6.38.8 - Xenomai:2.6.0
>> arch:i686 i386 GNU/Linux
>>
>> Hi,
>>
>> The attached code shows a malfunction of the pthread_mutex_trylock function.
>>
>>
>> Description of test.c:
>> The main task takes the mutex during 1second while the 't1' task tries
>> to take this mutex from 0.5sc.
>> We can notice that with the posix skin of xenomai, t1 never succeeded to
>> take the mutex, which is not the case without the posix skin of xenomai.
>>
>>
>>
>> Duchesne Alexandre
>> duch.alexandre@gmail.com
> 
> pthread_mutex_trylock is know to be broken in Xenomai 2.6.0, this has 
> been fixed in xenomai current development branch. See patches:
> http://git.xenomai.org/?p=xenomai-2.6.git;a=commitdiff;h=a0822a77ba383dac832253e6f0ca3431860a5661;hp=b3af76a4dc4cc2282fb83cdfeb9c454a1242a125
> http://git.xenomai.org/?p=xenomai-2.6.git;a=commitdiff;h=de094a9e580511eb2dfdc0cee78bf92c959e2c55;hp=28256f3937c80f25fd6f49394a4ffb5d7b3179c7
> 

This should be fixed in the just released Xenomai 2.6.1.

-- 
					    Gilles.