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mq_open(): Function not implemented

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mq_open(): Function not implemented

Postby ssssam » Thu Jan 24, 2013 4:08 pm

Hi,

I have an app just after kernal boot up. I use message queue in it. If I call mq_open() right away in my app, it shows " mq_open(): Function not implemented". If put sleep(1) before mq_open(), then it is fine.

As my understanding, mq_open(...,"my_mq_name",...) will create a path /dev/mqueue/my_mq_name. Just like file open() and create a file descriptor.

Questions: Is there any procondition or dependence for using mq?

Thanks
Sam
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Re: mq_open(): Function not implemented

Postby Tim » Thu Jan 24, 2013 5:12 pm

Obviously you must start mq before your app attempts to make the mq_open() call. Mqueue (and I believe mq) also require that gns is running.

But the error message you are getting isn't one of the ones that are returned from mq_open. It looks more like something you'd see if you linked your process using a shared library that wasn't yet available (or gns isn't yet available).

So the question is how are you linking your app and what's your boot up look like.

Tim
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