RE: Switch from TI-RTOS to SimpleLink POSIX: From MailBox to Message Queue

gecoz — Sat, 12 May 2018 17:15:16 GMT

Hi Jan,

I believe the POSIX queue is ultimately implemented as a file on the system (making it persistent to reboot). Just like files, it is managed using descriptors, which is a finite resource of the system.

The mq_open() call associates a descriptor to the queue, and normally I would expect the caller to release the descriptor once finished using it.

...In this case, we open the queue for writing. I don't close the queue - not sure if that's correct or if I'm leaking resources...

Now, if the sender side is implemented as a short lived process, it is probably OK to omit the call to mq_close(), as all the resources used by a process are automatically released upon process' termination.

But if your sender is part of a long lived process (i.e. a daemon), and your function is going to be invoked multiple times, then it is advisable to add a call to mq_close() before exiting the function.

Fabio