26.多线程join detach

#include <iostream>
#include <thread>
#include <array>
#include <Windows.h>
using namespace std;

void show()
{
    MessageBoxA(0, "1", "1", 0);
}

void main()
{
    //获取CPU核心的个数
    auto n = thread::hardware_concurrency();
    cout << "CPU核心个数:" << n << endl;
    array<thread, 3> threads{thread(show), thread(show), thread(show)};
    
    for (int i=0;i<3;i++)
    {
        //使用join后主线程等待执行完之后才结束
        //threads[i].join();
        //脱离主线程,主线程结束不报错,自动退出
        threads[i].detach();
    }
    
    Sleep(3000);
}