posix message queues

[Sebastian Huber]

On 09/10/2010 05:02 PM, Lisa A. Day wrote:
> Hi All,
> I'm experiencing some oddities with the posix msqs, which I'm hopefully
> missing some simple tips to overcome (hopefully not missing the point
> all together) .
> 1)  In my app, the API is extremely picky about names - "/" plus 6
> characters -- only. Is this correct? I can deal with it, but it took
> some time to figure it out.

Which errno value do you observe in case your name is longer than that?

> 2) I can spawn mulitple threads from the POSIX_init process no problem,
> but I can't spawn a thread from one of its child processes. Is there a
> trick or caveat to accomplishing this?

We have only one process in RTEMS, but may have multiple tasks (or threads).
Which errno value do you observe? Check the CONFIGURE_MAXIMUM_POSIX_THREADS
configuration option.

> 
> Thanks - and if anyone knows of some good tech notes or documentation
> for this API that I haven't found, that would be helpful...

http://www.opengroup.org/onlinepubs/000095399/basedefs/mqueue.h.html

> 
> 
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-- 
Sebastian Huber, embedded brains GmbH

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