init_set_fd      3947 thread.c           args.read = (events & RB_WAITFD_IN) ? init_set_fd(fd, &rfds) : NULL;
init_set_fd      3948 thread.c           args.write = (events & RB_WAITFD_OUT) ? init_set_fd(fd, &wfds) : NULL;
init_set_fd      3949 thread.c           args.except = (events & RB_WAITFD_PRI) ? init_set_fd(fd, &efds) : NULL;