You really should just read the linked article, but the tl;dr is that sched_yield() does not convey intent (except in narrow realtime scenarios that you should not be using in the first place).

Tell the kernel why you want to yield CPU. Work with the kernel, not against it. Do you want to yield because you genuinely want to wait until some future point in time? Use sleep. Is it because you're waiting for some I/O? Use poll or its variants. Is it because you're waiting for a signal from another thread? Use mutexes, condition variables, etc. that call futex under the hood.