I think its kotlin's model. The language don't have a default co-routine executor set, you need to provide your own or spawn one with the std. It can be thread-

I think its kotlin's model. The language don't have a default co-routine executor set, you need to provide your own or spawn one with the std. It can be thread-pooled, single thread, or custom one but there isn't a default one set. If you use single threaded executor, then race condition won't happen. If you choose pooled, then you obviously should realize there can be a race condition. It's all about choice you made.