1 #include <iostream>
 2 #include <thread>
 3 #include <array>
 4 #include <Windows.h>
 5 using namespace std;
 6 
 7 void show()
 8 {
 9     MessageBoxA(0, "1", "1", 0);
10 }
11 
12 void main()
13 {
14     //獲取CPU核心的個數
15     auto n = thread::hardware_concurrency();
16     cout << "
 
CPU核心個數:" << n << endl;
17     array<thread, 3> threads{thread(show), thread(show), thread(show)};
18     
19     for (int i=0;i<3;i++)
20     {
21         //使用join後主線程等待執行完之後才結束
22         //threads[i].join();
23         //脫離主線程,主線程結束不報錯,自動退出
24         threads[i].detach();
25     }
26
 
     
27     Sleep(3000);
28 }

26.多線程join detach