@jan funnily, the lack of #POSIX #timers in #OpenBSD inspired me to come up with a timer implementation supporting different backends. I was annoyed at first, but didn't regret it. The interface offered by POSIX timers is really clumsy, they can either send some signal or (even worse) launch a thread. My current code only uses them on #illumos, which offers a better signaling mechanism on an "event port". Where available, #kqueue is used for timers. the next fallback is #Linux' #timerfd. And finally, as a last resort, some manual multiplexing on top of #setitimer (cause it's not much worse than "vanilla" POSIX timers).

tl;dr, might be an alternative to contribute code to upstream enabling them to use better platform interfaces for timers...