std::thread有一个get_id()函数可以唯一标识系统中线程。示例如下

#include <chrono>
#include <iostream>
#include <string>
#include <thread>
#include <vector>

std::thread::id  master;

void func(int i)
{
    std::string msg = std::to_string(i);
    if (master == std::this_thread::get_id())
        msg += ": i am number one,yeah!\n";
    else
        msg += ": we have the same hobby!\n";
    std::cout << msg.c_str();
}

int main()
{
    std::vector<std::thread> thrds;
    for (int i = 0; i < 16; i++)
    {
        std::thread t(func, i);
        thrds.push_back(std::move(t));
    }

    master = thrds[0].get_id();

    for (int i = 0; i < 16; i++)
        thrds[i].detach();


    std::this_thread::sleep_for(std::chrono::seconds(4));
    int a;
    std::cout << "input an integer:\n";
    std::cin >> a;
    std::cout << "you input " << a << std::endl;

    return 0;
}

在我的机器上运行结果如下：