hw05 #18
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hw05 #18
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难点主要在如何写线程池，因为不太会用MTQueue，所以从stack overflow上找了一个改了改，核心思想就是先建和cpu核心数相同数量的线程，然后生产者消费者模型，真实线程while(true)循环作为消费者，产生的线程作为生产者往面送。done函数是用来手动停止线程池工作。
然后就是有读有写的段落用shared_mutex读写锁，只读或者只写的段落用普通锁就可以了。
为了体现RAII思想在thread pool的析构函数里把所有线程join一边即可。