[riot-notifications] [RIOT-OS/RIOT] core/mutex: Add mutex_cancel (#15442)
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Fri Nov 13 21:00:20 CET 2020
### Contribution description
This commit adds the (pseudo)-module `mutex_cancel`, which unlocks the likewise named function. With this function, a thread blocked with `mutex_lock()` can be unblocked without it obtaining the mutex. A caller of `mutex_lock()` is notified via an `-ECANCELED` return code.
This is intended to simplify the implementation of `xtimer_mutex_lock_timeout()` and to implement `ztimer_mutex_lock_timeout()`.
### Testing procedure
With `tests/mutex_cancel` a test application is provided that must succeed.
### Issues/PRs references
Split out of https://github.com/RIOT-OS/RIOT/pull/15052
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-- Commit Summary --
* core/mutex: Add mutex_cancel()
* tests: Add test for core_mutex_cancel
-- File Changes --
M core/include/mutex.h (26)
M core/mutex.c (44)
A tests/mutex_cancel/Makefile (6)
A tests/mutex_cancel/main.c (82)
A tests/mutex_cancel/tests/01-run.py (20)
-- Patch Links --
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