#include <chrono>
#include <iostream>
#include <thread>
bool stopAtTheCrossroad()
{
    std::cout << std::this_thread::get_id();
    char ch;
    std::cin.get(ch);
    if (ch == 'q')
        return true;

    return false;
}

int main()
{
    bool exit{false};
    std::thread th([&exit]() { exit = stopAtTheCrossroad(); });
    for (int i = 0; true; ++i)
    {
        std::cout << "iter " << i + 1 << ": \tprint, thread id = " << std::this_thread::get_id() << std::endl;
        std::this_thread::sleep_for(std::chrono::milliseconds(300));
        if (exit)
            break;
    }
    th.join();
    return 0;
}