#include <iostream>
#include <string_view>
#include <syncstream>
#include <thread>

using namespace std::literals;

const auto T = 250ms;

void f(const std::jthread &j, std::string_view s)
{
    for (auto i : s)
        if (j.get_stop_token().stop_requested())
        {
            std::this_thread::yield();
        }
        else
        {
            std::osyncstream(std::cout)
                << "[" << j.get_id() << "]: " << i << "\n";
            std::this_thread::sleep_for(T);
        }
}

int main()
{
    std::jthread d{f, std::ref(d), "0123456789"},
                 a{f, std::ref(a), "abcdefghij"};
    std::this_thread::sleep_for(2 * T);
    d.request_stop();
    a.join();
}