How to wait io_context until handler dispatched

[poor-circle]

Is there has any way to implement code like this?

void async_wait_handler(std::shared_ptr<asio::io_context> ioc) {
      async_wait(*ioc, [ioc](auto&){
            // now, until one handler has been dispatched
            // do sth like: ioc->poll();
      });
}
void sync_wait_handler(asio::io_context& ioc) {
      ioc.wait(); // may block
      // now, until one handler has been dispatched
      // do sth like: ioc.poll();
}