CPP 多线程

/* CPP 多线程 */

#include<iostream>
#include<thread>
#include<windows.h>
#include<vector>

using namespace std;
using namespace std::this_thread;

void msg()
{
    MessageBox(0,"12345","6789",0);
}

void msgA(int num)
{
    std::cout << get_id() << "  num=   " << num << std::endl;
}

int main()
{
    // thread::hardware_concurrency(); 检测cpu有多少个线程
    auto n = thread::hardware_concurrency();

    std::cout << n << std::endl;
    
    // 获取当前线程编号 get_id()
    std::cout << "thread = " << get_id() << std::endl;
    
    
        thread thread1(msg);// 创建多线程
        thread thread2(msg);
        thread1.join();// 调用  开始执行
        thread2.join();// 调用
    
    std::cin.get();
}


//---------------------------------------------------------

void main()
{
    vector<thread *> threads;
    for (int i=0;i<10 ;i++ )
    {
        threads.push_back(new thread(msg));// 创建一个线程
    }

    for (auto th: threads)
    {
        th->join();
    }

    std::cin.get();
}

//---------------------------------------------------------

void main()
{
    vector<thread *> threads;

    for (int i = 0; i < 10; i++)
    {
        threads.push_back(new thread(msgA,i));//创建线程
    }

    for (auto th : threads)
    {
        th->join();
    }

    std::cin.get();
}