[riot-notifications] [RIOT-OS/RIOT] sys/sema_inv: add inverse Semaphore (#15762)

Marian Buschsieweke notifications at github.com
Thu Jan 14 09:02:13 CET 2021

@maribu commented on this pull request.

> +    atomic_fetch_and_u32(&s->value, ~mask);
+    if (s->value == 0) {

This could result in multiple threads calling `mutex_unlock()`. This is not a problem with the current implementation, but maybe it is better to not rely on this.

    if (atomic_fetch_and_u32(&s->value, ~mask) == mask) {

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