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

using namespace std::literals::chrono_literals;

const auto T = 250ms;

void f(std::stop_token stop_token, std::string_view s)
{
    std::ostringstream ss;
    ss << "[" << std::this_thread::get_id() << "]: ";
    for (auto i: s)
        if (stop_token.stop_requested())
        {
            std::this_thread::yield();
        }
        else
        {
            std::osyncstream(std::cout) << ss.str() << i << "\n";
            std::this_thread::sleep_for(T);
        }
}

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