void once_task(void* data){
    DLOG(ELL_INFO, "once_task done: %p", data);
}
int main(int argc, char** argv) {
    Engine& eng = Engine::getInstance();
    if (!eng.init(argv[0], false, "{}")) {
        printf("main>> engine init fail\n");
        return -1;
    }
    eng.getLoop().postTask(once_task, (void*)nullptr);
    eng.run();
    DLOG(ELL_INFO, "main>>exit...");
    eng.uninit();
    printf("main>>stop\n");
    return 0;
}