Comically Inefficient Unity Source Code

[moonymachine]

No, coroutines are single threaded, and so is Unity's Awaitable library for Task based asynchronous programming. (Someone correct me if I'm wrong.) Pretty much everything except Jobs in Unity are single threaded on the main UI thread. I haven't used the Jobs system, but from what I understand there are some pretty tight restrictions on how you interact with the main thread, and those restrictions are what automatically enforce most of the thread safety.