very new to posting here, so apologies if it’s in the wrong place.

I’m a hobby coder, so my experience is limited and while I learned C++ some years ago, I have to re-learn it periodically. Now is such a time.

I’m trying to understand jthread and it’s associated stop_token mechanism.

I’ve finally managed to get the threads working (using VS 2022 with language standard set to C++ 20). Now though I can’t get them to stop. I can’t work out what I’m doing wrong here as the main thread runs to the end, but the stop_request calls seem to do nothing:

#include <iostream>
#include <chrono>
#include <thread>
#include <functional>

class Testing {
    int updates{ 0 };

public:
    void update(std::stop_token s, int i, char l) {
        while (!s.stop_requested()) {
            updates++;
            std::cout << updates << " " << l << "n";
            std::this_thread::sleep_for(std::chrono::milliseconds(i));
        }
        std::cout << l << " stoppedn";
    }
};


int main() {

    Testing test_1, test_2;
    std::stop_token s_1, s_2;

    
    std::jthread t_1(&Testing::update, &test_1, s_1, 2300, 'A');
    std::jthread t_2(&Testing::update, &test_2, s_2, 700, 'B');
    

    std::this_thread::sleep_for(std::chrono::milliseconds(10000));
    std::cout << "Main thread donen";

    t_1.request_stop();
    if (t_1.joinable()) { t_1.join(); }

    t_2.request_stop();
    if (t_2.joinable()) { t_2.join(); }

    return 0;

}

If anyone can help me here I’d be most grateful!