[boost] boost::asio::deadline_timer and boost::asio::io_service

Hi, I use a single thread to run 3 classes using boost::asio::deadline_timer, the timers are managed by boost::asio::io_service. I deliberately use a single thread to avoid mutex, I believe those 3 timers are called exclusively by boost::asio::io_service in a single thread, there won't be race condition to share the objects among them, is it correct? Thank you. Kind regards, - jupiter