[riot-notifications] [RIOT-OS/RIOT] core/mutex: Add mutex_cancel (#15442)

chrysn notifications at github.com
Sun Nov 15 13:26:03 CET 2020

I've just only read through this being pinged -- what I don't quite understand from a first look at this is: Why does this need something changed around mutexes? Given that we have the mechanism of waiting for thread flags, can't a function like "lock this mutex or time out" just be implemented using `thread_flags_wait_one(THREAD_FLAG_MUTEX_READY | THREAD_FLAG_TIMEOUT)`?

(And I too see trouble in making a function that previously worked unconditionally suddenly fallible, but I may still lack parts of the big picture).

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