[Xenomai] Question about Xenomai, Posix and Java

[Xenomai] Question about Xenomai, Posix and Java

[Héctor Vargas]

Hi everyone,

I want to create an application where a control task (real time control 
of a DC motor) developed in Xenomai (posix skin) can be controlled from 
a Java interface (GUI). The idea is to create a middle task between the 
xenomai control task and the Java application working as a gateway by 
using TCP sockets. Before starting to work on it I would like to know if 
someone has already done something like this. It is possible to do it?.

Thanks for your answer,

Héctor.-

Re: [Xenomai] Question about Xenomai, Posix and Java

[Gilles Chanteperdrix]

On 12/13/2012 05:05 PM, Héctor Vargas wrote:

> Hi everyone,
> 
> I want to create an application where a control task (real time control 
> of a DC motor) developed in Xenomai (posix skin) can be controlled from 
> a Java interface (GUI). The idea is to create a middle task between the 
> xenomai control task and the Java application working as a gateway by 
> using TCP sockets. Before starting to work on it I would like to know if 
> someone has already done something like this. It is possible to do it?.


I do not see why it would not work (RTnet has everything needed AFAIK).
But why not invoking the Xenomai code from the Java code as JNI ?

-- 
                                                                Gilles.

Re: [Xenomai] Question about Xenomai, Posix and Java

[Wolfgang Mauerer]

On 15/12/2012 12:59, Gilles Chanteperdrix wrote:
> On 12/13/2012 05:05 PM, Héctor Vargas wrote:
> 
>> Hi everyone,
>>
>> I want to create an application where a control task (real time control 
>> of a DC motor) developed in Xenomai (posix skin) can be controlled from 
>> a Java interface (GUI). The idea is to create a middle task between the 
>> xenomai control task and the Java application working as a gateway by 
>> using TCP sockets. Before starting to work on it I would like to know if 
>> someone has already done something like this. It is possible to do it?.
> 
> 
> I do not see why it would not work (RTnet has everything needed AFAIK).
> But why not invoking the Xenomai code from the Java code as JNI ?
> 
we have also made good experiences with an architecture that uses
a lock-free/wait-free communication scheme between non-RT and RT
components, see
http://www.linuxtag.org/2012/fileadmin/www.linuxtag.org/slides/Gernot%20Hillier%20+%20Wolfgang%20Mauerer%20+%20Jan%20Sawallisch%20-%20Android_%20real-time%20for%20the%20rest%20of%20us.p416.pdf

(the paper is about Java in the sense of Android and real-time in the
sense of preempt_rt, but the scheme is immediately transferable to
Java/Xenomai)

Cheers, Wolfgang