sleep_timeval      63 thread.c       static void sleep_timeval(rb_thread_t *th, struct timeval time);
sleep_timeval     859 thread.c           sleep_timeval(th, double2timeval(sleepsec));
sleep_timeval     868 thread.c           sleep_timeval(th, time);
sleep_timeval     875 thread.c           sleep_timeval(th, time);