[Xenomai-help] 32 bits libraries for x86_64 architecture

[Xenomai-help] 32 bits libraries for x86_64 architecture

[Kim Mathiassen]

Hi

I am doing a project where I am going to use Labview for linux. 
Unfortunately Labview only have a 32-bit version and I have a 64 bit 
system. I want to use Xenomai with Labview for DAQ, and therefor I need 
32 bits libraries that Labview can call. I read a message in the 
mailing-list which where of a similar character:

https://mail.gna.org/public/xenomai-help/2008-05/msg00294.html

I have tried to compile the user-space Xenomai libraries with the m32 
option, but I only get -ENOSYS error which implies that the function is 
not implemented. Is there any plan to implement 32 bit wrappers for a 64 
bit system? Do I have to install a 32 bit kernel in order to use Xenomai 
with Labview? Does anyone have a suggestion on how to solve the problem?

I the message the linked to above, it was suggested that I could 
implement the wrappers. Does anyone know about how much work this would 
be? If it isn't a lot of work, maybe someone could point me to where in 
the code I should start looking.

I am also thinking of making a 64 bit deamon that a 32 bit library can 
communicate with. I am not sure if this will work, because I do not know 
if there are IPC (InterProcess Communication) that can handle both 32 
and 64 bit on Linux?

Best regards
Kim Mathiassen

Re: [Xenomai-help] 32 bits libraries for x86_64 architecture

[Gilles Chanteperdrix]

On 07/07/2011 11:40 AM, Kim Mathiassen wrote:
> Hi
> 
> I am doing a project where I am going to use Labview for linux. 
> Unfortunately Labview only have a 32-bit version and I have a 64 bit 
> system. I want to use Xenomai with Labview for DAQ, and therefor I need 
> 32 bits libraries that Labview can call. I read a message in the 
> mailing-list which where of a similar character:
> 
> https://mail.gna.org/public/xenomai-help/2008-05/msg00294.html
> 
> I have tried to compile the user-space Xenomai libraries with the m32 
> option, but I only get -ENOSYS error which implies that the function is 
> not implemented. Is there any plan to implement 32 bit wrappers for a 64 
> bit system? Do I have to install a 32 bit kernel in order to use Xenomai 
> with Labview? Does anyone have a suggestion on how to solve the problem?
> 
> I the message the linked to above, it was suggested that I could 
> implement the wrappers. Does anyone know about how much work this would 
> be? If it isn't a lot of work, maybe someone could point me to where in 
> the code I should start looking.
> 
> I am also thinking of making a 64 bit deamon that a 32 bit library can 
> communicate with. I am not sure if this will work, because I do not know 
> if there are IPC (InterProcess Communication) that can handle both 32 
> and 64 bit on Linux?

No Xenomai service is currently implemented in 32 bits mode. It is a ton
of work to do so, because you need to write wrappers for all the system
calls, and there are probably a handful of hundreds of them (a grep | wc
gives 433).

So, currently, it seems easier to use either a complete 64 bits or  to a
complete 32 bits system, not a mix of both.

-- 
                                                                Gilles.

Re: [Xenomai-help] 32 bits libraries for x86_64 architecture

[Kim Mathiassen]

On 07/11/2011 01:19 PM, Gilles Chanteperdrix wrote:
> On 07/07/2011 11:40 AM, Kim Mathiassen wrote:
>> Hi
>>
>> I am doing a project where I am going to use Labview for linux.
>> Unfortunately Labview only have a 32-bit version and I have a 64 bit
>> system. I want to use Xenomai with Labview for DAQ, and therefor I need
>> 32 bits libraries that Labview can call. I read a message in the
>> mailing-list which where of a similar character:
>>
>> https://mail.gna.org/public/xenomai-help/2008-05/msg00294.html
>>
>> I have tried to compile the user-space Xenomai libraries with the m32
>> option, but I only get -ENOSYS error which implies that the function is
>> not implemented. Is there any plan to implement 32 bit wrappers for a 64
>> bit system? Do I have to install a 32 bit kernel in order to use Xenomai
>> with Labview? Does anyone have a suggestion on how to solve the problem?
>>
>> I the message the linked to above, it was suggested that I could
>> implement the wrappers. Does anyone know about how much work this would
>> be? If it isn't a lot of work, maybe someone could point me to where in
>> the code I should start looking.
>>
>> I am also thinking of making a 64 bit deamon that a 32 bit library can
>> communicate with. I am not sure if this will work, because I do not know
>> if there are IPC (InterProcess Communication) that can handle both 32
>> and 64 bit on Linux?
> No Xenomai service is currently implemented in 32 bits mode. It is a ton
> of work to do so, because you need to write wrappers for all the system
> calls, and there are probably a handful of hundreds of them (a grep | wc
> gives 433).
>
> So, currently, it seems easier to use either a complete 64 bits or  to a
> complete 32 bits system, not a mix of both.
>
Thanks for the reply. I have been implementing the deamon approach. It 
seems to be working. Unix sockets can communicate between 32 and 64 bit 
programs.

Re: [Xenomai-help] 32 bits libraries for x86_64 architecture

[Gilles Chanteperdrix]

On 07/11/2011 02:55 PM, Kim Mathiassen wrote:
> On 07/11/2011 01:19 PM, Gilles Chanteperdrix wrote:
>> So, currently, it seems easier to use either a complete 64 bits or  to a
>> complete 32 bits system, not a mix of both.
>>
> Thanks for the reply. I have been implementing the deamon approach. It 
> seems to be working. Unix sockets can communicate between 32 and 64 bit 
> programs.

Yes, but make you switch to secondary mode. IOW, you no-longer are
real-time.

-- 
					    Gilles.

Re: [Xenomai-help] 32 bits libraries for x86_64 architecture

[Kim Mathiassen]

On 07/11/2011 03:19 PM, Gilles Chanteperdrix wrote:
> On 07/11/2011 02:55 PM, Kim Mathiassen wrote:
>> On 07/11/2011 01:19 PM, Gilles Chanteperdrix wrote:
>>> So, currently, it seems easier to use either a complete 64 bits or  to a
>>> complete 32 bits system, not a mix of both.
>>>
>> Thanks for the reply. I have been implementing the deamon approach. It
>> seems to be working. Unix sockets can communicate between 32 and 64 bit
>> programs.
> Yes, but make you switch to secondary mode. IOW, you no-longer are
> real-time.
>
Only the thread communicating with Unix sockets will go to secondary 
mode? I guess there is no way of getting the labview threads to Xenomai 
threads? If there is no way of getting the labview threads to real-time 
threads, at least some of the code will run in real-time mode. I will 
run Labview on a dedicated core and with the highest priority to 
hopefully cope with the real-time demands. Of course there is no guaranties.

Kim