Function cycle

example/timer.cpp:5–10

using namespace co_context;

task<> cycle(int sec, const char *message) {
    while (true) {
        co_await timeout(std::chrono::seconds{sec});
        printf("%s\n", message);
    }
}

task<> cycle_abs(int sec, const char *message) {
    auto next = std::chrono::steady_clock::now();