http://www.cplusplus.com/reference/condition_variable/condition_variable/notify_one/

#include <iostream>           // std::cout
#include <thread>             // std::thread
#include <mutex>              // std::mutex, std::unique_lock
#include <condition_variable> // std::condition_variable

// spawn 10 consumers and 10 producers:
// join them back:

Don't you tell me something I already know!

那个3s我可费了老鼻子劲了。
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