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

benpicco notifications at github.com
Thu Nov 19 00:37:56 CET 2020

@benpicco approved this pull request.

Looks good to me.
This makes for a useful addition. Having a way to abort a thread blocking on a mutex is a good tool to have.

I was contemplating a micro-optimization of just storing `-ECANCELED` in the `cancelled` flag and then unconditionally returning that, but it's cleaner this way.

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