[riot-notifications] [RIOT-OS/RIOT] core/mbox: add mbox_size(), mbox_avail() (#15478)

Kaspar Schleiser notifications at github.com
Fri Nov 20 10:41:14 CET 2020

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description

Previously, gnrc_sock directly accessed members of mbox_t to get the size of an mbox queue or availability of mbox messages.
This PR provides an API for that. Another commit makes gnrc_sock use the new API.

Put here the description of your contribution:
- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure

The change is rather small, but probably some gnrc_sock tests should be done.
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- which test/example to compile for which board and is there a 'test' command
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### Issues/PRs references

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-- Commit Summary --

  * core/mbox: add mbox_size() and mbox_avail()
  * sys/gnrc/sock: make use of mbox_size() and mbox_avail()

-- File Changes --

    M core/include/mbox.h (26)
    M sys/net/gnrc/sock/gnrc_sock.c (4)

-- Patch Links --


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