rb_thread_wakeup_timer_thread  699 signal.c           rb_thread_wakeup_timer_thread();
rb_thread_wakeup_timer_thread 1213 thread_pthread.c 	rb_thread_wakeup_timer_thread();
rb_thread_wakeup_timer_thread 1030 vm_core.h      void rb_thread_wakeup_timer_thread(void);