https://blog.wongcw.com/2022/08/20/%e9%a6%ac%e6%96%af%e5%85%8b%e8%88%87%e8%85%a6%e9%83%a8%e8%8a%af%e7%89%87%e5%88%9d%e5%89%b5%e5%85%ac%e5%8f%b8synchron%e6%8e%a5%e6%b4%bd/