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

[Marian Buschsieweke]

@maribu commented on this pull request.



>      irq_restore(irq_state);
     thread_yield_higher();
     /* We were woken up by scheduler. Waker removed us from queue. */
-    return 0;
+}
+
+void mutex_lock(mutex_t *mutex)
+{
+    unsigned irq_state = irq_disable();
+
+    DEBUG("PID[%" PRIkernel_pid "]: Mutex in use.\n", thread_getpid());

I made the debug output more consistent and just use the function names, which both describe quite well what is done and how to find the corresponding code.

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