sleep_timeval      85 thread.c       static void sleep_timeval(rb_thread_t *th, struct timeval time, int spurious_check);
sleep_timeval    1174 thread.c           sleep_timeval(th, double2timeval(sleepsec), spurious_check);
sleep_timeval    1181 thread.c           sleep_timeval(th, time, 1);
sleep_timeval     431 thread_sync.c      sleep_timeval(GET_THREAD(), *t, 0); /* permit spurious check */