Tomoyuki Chikanaga <nagachika00 / gmail.com> wrote: > To cover this race condition, ubf_select() also call > add_signal_thread_list() to register "signal thread list". Timer > thread periodically send SIGVTALRM to threads in signal thread list. Ah, I missed the second part of that earlier. My concern raised in [ruby-core:39643] is no more, thank you.