C++实现生产者消费者

#include <condition_variable>#include <mutex>#include <thread>#include <iostream>#include <queue>#include <chrono>int main(){    // 生产者数量    std::queue<int> produced_nums;    // 互斥锁    std::mutex m;    // 条件变量    std::condition_variable cond_var;    // 结束标志    bool done = false;    // 通知标志    bool notified = false;    // 生产者线程    std::thread producer([&]() {        for (int i = 0; i < 5; ++i) {            std::this_thread::sleep_for(std::chrono::seconds(1));            // 创建互斥锁            std::unique_lock<std::mutex> lock(m);            std::cout << "producing " << i << '\n';            produced_nums.push(i);            notified = true;            // 通知一个线程            cond_var.notify_one();        }           done = true;        cond_var.notify_one();    });     // 消费者线程    std::thread consumer([&]() {        std::unique_lock<std::mutex> lock(m);        while (!done) {            while (!notified) {  // 循环避免虚假唤醒                cond_var.wait(lock);            }               while (!produced_nums.empty()) {                std::cout << "consuming " << produced_nums.front() << '\n';                produced_nums.pop();            }               notified = false;        }       });     producer.join();    consumer.join();}