博客:排序
https://mortoray.com/博客
重排序:https://mortoray.com/2010/11/18/cpu-reordering-what-is-actually-being-reordered/it
雙檢鎖:https://mortoray.com/2012/02/28/double-checked-locking-why-doesnt-it-work-and-how-to-fix-it/cpu