ret = pthread_attr_init(&attr);
ret = pthread_attr_setstacksize(&attr, THREADSTACKSIZE);
ret = pthread_create(&thread, &attr, CTC_backend, (void *)start_routine);
ret = pthread_attr_init(&attr);
ret = pthread_attr_setstacksize(&attr, THREADSTACKSIZE);
ret = pthread_create(&thread, &attr, CTC_backend, (void *)start_routine);