reset_unblock_function  116 thread.c       static void reset_unblock_function(rb_thread_t *th, const struct rb_unblock_callback *old);
reset_unblock_function 1277 thread.c           reset_unblock_function(th, &region->oldubf);
reset_unblock_function  288 thread_sync.c  	    reset_unblock_function(th, &oldubf);