[bonus] impl advanced thread pool

[LeaYeh]

假如我号称精通C++，你作为考官准备怎么难住我？ - xiaokang 的回答 - 知乎 https://www.zhihu.com/question/825891126/answer/1977117901019453374?share_code=lREH1fIFtHEK&utm_psn=1982337955357037523