Robert McCullough wrote:
> Hi,
>
> I am converting part of a C++ application to real-time.
>
> I noticed that all the Xenomai examples call
> mlockall(MCL_CURRENT|MCL_FUTURE) at the beginning of main before creating
> any real-time threads.
> Is calling mlockall a requirement when using Xenomai?
Yes it is.
>
> I have added a couple of Xenomai tasks to my C++ app.
> A) Without calling mlockall my application seems to run fine but I noticed
> in /proc/xenomai/stat that a few page faults occurred.
Well normally your application should stop with a message telling you
that you have not call mlockall. Do you happen to install a handler for
SIGXCPU ?
> B) When calling mlockall at the beginning of my main() I do not see any page
> faults but some of the C++ threads do not start.
>
> Why would mlockall cause some threads not to start?
Well, you should check rt_task_create or pthread_create return
value. The usual error is that you run out of memory because of the
stack size problem explained in the TROUBLESHOOTING guide.
--
Gilles.
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