Re: [Xenomai-help] Meassage Queue c++

[Jan Kiszka <jan.kiszka@domain.hid>]

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Stephan Zimmermann wrote:
> Jan Kiszka wrote:
> 
>> Some further things to try before giving C++ up - and maybe stumbling
>> over the same issue with C:
> I tryed out xenomai queues in plain C, works perfekt.
> 
>>  o Did you mlockall() your program? If not, lazy-mapped pages may cause
>>    SEGFAULTS in the RT domain which will kill your program.
> I call "mlockall(MCL_CURRENT | MCL_FUTURE);" as one of the first things in 
> main();
>>  o Does your kernel log contain any hints of Xenomai about what's going
>>    on?
> No, ist does not contain anything
> 
>>  o Try running your program inside a debugger to catch the fault and its
>>    location. When your system is head-less, use gdbserver.
> I tryed debugging, I singlestepped through it and learned that it crashes when 
> calling rt_queue_recv(), but I can not tell why.
> 
> maybe it is because I do the "bind-thing" in the constructor, resulting in 
> multiple objects of RT_QUEUE referring to the same queue.

But this is the idea of a queue: two users are referring to the same
object in order to communicate with each other!?

Would you mind to break out a demonstration code of your problem? Just
to check if there is some subtle Xenomai issue hidden or if it's an ugly
pitfall when using C++ in hard-RT context.

Jan


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