使用C++标准库编写多线程程序

代码：

#include <iostream>
#include <thread>

void func(int n_print);

int main(int argc, char* argv[])
{
    std::cout << "Thread_ID of main(): " << std::this_thread::get_id() << std::endl;

    std::thread th1(func, 5);
    std::thread th2(func, 3);
    // th1.join();

    for (int i = 0; i < 5; i++) {
        std::cout << "main()" << std::endl;
    }
    std::cout << "main()" << std::endl;
    std::cout << "main()" << std::endl;
    std::cout << "main()" << std::endl;

    th1.join();
    th2.join();

    return 0;
}

void func(int n_print)
{
    for (int i = 0; i < n_print; i++) {
        std::cout << "Thread_ID: " << std::this_thread::get_id() << " n = "<< n_print << std::endl;
        std::cout << i << ": " << "from func()" << std::endl;
    }
}

运行结果：

Thread_ID of main(): 1676
main()
main()
main()
main()
main()
main()
main()
main()
Thread_ID: Thread_ID: 988 n = 3
0: from func()
Thread_ID: 988 n = 3
1: from func()
Thread_ID: 988 n = 3
2: from func()
11220 n = 5
0: from func()
Thread_ID: 11220 n = 5
1: from func()
Thread_ID: 11220 n = 5
2: from func()
Thread_ID: 11220 n = 5
3: from func()
Thread_ID: 11220 n = 5
4: from func()