[riot-notifications] [RIOT-OS/RIOT] sys/sched_rr: Add a round robin scheduler module (#16126)

Karl Fessel notifications at github.com
Thu Apr 8 14:58:21 CEST 2021

@kfessel commented on this pull request.

> +}
+ * @brief   count the number of threads in a runqueue up to 2
+ *
+ * @param[in]   prio      the priority of the runqueue to get the length from
+ * @returns     number of threads in a runqueue up to 2
+ * @retval 0    The runqueue is empty
+ * @retval 1    There is exactly one thread in the runqueue
+ * @retval 2    There are at least two threads in the runqueue
+ *
+ * @warning This API is not intended for out of tree users.
+ *          Breaking API changes will be done without notice and
+ *          without deprecation. Consider yourself warned!
+ */
+static inline uint_fast8_t sched_runqueue_len2(uint8_t prio)

a first test showed that a simple capped variant of `clist_count_upto(` generates more code with -Og (native).
since i also still would need some thing like:
static inline uint_fast8_t sched_runqueue_len2_bob(uint8_t prio)
    return clist_count_upto(&sched_runqueues[prio],2);
i stop my test right now 
i did test with an L073 -both variants generated the same code size
so if clist is in need for this feature i will port it move it and would use the sched_rq_len2 you see above this

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