Function cycle_abs

example/timer.cpp:12–19

}

task<> cycle_abs(int sec, const char *message) {
    auto next = std::chrono::steady_clock::now();
    while (true) {
        next = next + std::chrono::seconds{sec};
        co_await timeout_at(next);
        printf("%s\n", message);
    }
}

int main() {
    io_context ctx;