40.线程等待固定时间

#include <iostream>
#include <thread>
#include <mutex>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <Windows.h>
using namespace std;

condition_variable cv;
mutex m;
bool done = false;

void run()
{
    //获取当前时间
    auto start = chrono::high_resolution_clock::now();
    auto end = chrono::high_resolution_clock::now() + chrono::seconds(2);
    unique_lock<mutex> lk(m);
    while (!done)
    {
        //等待到end时间
        if (cv.wait_until(lk, end) == cv_status::timeout)
        {
            done = true;
            cout << "等待结束";
        }
    }
}

void main()
{
    thread th(run);
    cin.get();
}