c++ 线程条件变量

#include "stdafx.h"
#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <deque>
using namespace std;

std::mutex mt;
std::condition_variable cv;
std::deque<int> q;

void producer()
{
    int data = 10;while (data > 0)
    {
        std::unique_lock<std::mutex> lck(mt);
        q.push_front(data);　　//向队列中添加数据
        lck.unlock();
        cv.notify_one();　　　　//唤醒一个休眠的线程
        std::this_thread::sleep_for(std::chrono::seconds(1));
        data--;
    }
}

void consumer()
{
    int data = 0;while (data != 1)
    {
        std::unique_lock<std::mutex> lck(mt);
        while (q.empty())
        {
            cv.wait(lck);　　//如果队列为空，让线程处于等待休眠状态
        }
        data = q.back();
        q.pop_back();
        lck.unlock();
        std::cout << data << " " << std::endl;
    }
}

int main()
{
    std::thread th(producer);
    th.join();
    std::thread th1(consumer);
    th1.join();
    getchar();
    return 0;
}