native_thread_yield  940 thread.c       	    native_thread_yield();
native_thread_yield 1184 thread.c       	while (rb_signal_buff_size() && !th->exec_signal) native_thread_yield();
native_thread_yield 2973 thread.c           native_thread_yield();
native_thread_yield 2996 thread.c           if (interrupted == 2) native_thread_yield();
native_thread_yield 2998 thread.c           native_thread_yield();