[tabs_masterrace]

I found adopting a functional reactive programming really works well for multithreaded systems.

GCD is super great and I use it a lot (...if you had to extend AsyncTask recently: my condolences), but it doesn't safeguard you from race conditions, dealing with locks and all that fun stuff.

[woolvalley]

I don't have a lot of golang experience, but from what I can see here, golang doesn't really either: https://tour.golang.org/concurrency/1

Channels seem like a simple thread safe stream for the most part, which you can get with Rx.

[Groxx]

This is correct, golang doesn't give you thread safety for free. Values passed via channels are safe as they're implicitly locked (i.e. it's a blocking threadsafe queue), and there are happens-before semantics for starting a goroutine, otherwise you're on your own (explicit locks / atomics / lock-wrappers like sync.WaitGroup). E.g. variable assignment isn't even atomic.