Hello everyone.... Am I going crazy? In my Android...

# coroutines

[Andrey B.]

Hello everyone.... Am I going crazy? In my Android ViewModel I have something like this:

viewModelScope.launch(<http://Dispatchers.IO|Dispatchers.IO>) { someFunction() }
....
fun someFunction(){}

It's compiling!!! But whyyyy? Shouldn't someFunction() be suspendable??

[Zach Klippenstein (he/him) [MOD]]

You can call regular, non-suspending functions from suspending functions. You just can’t call suspending functions from regular ones.

[Andrey B.]

Well .... is it something new? I'm sorry for the stupid question

[albertosh]

The only limitation is that you must invoke suspended functions in a suspended block
If you could only invoke suspend methods in a suspended block you would not be able to do even a simple val i = 0 as it’s synchronous

[albertosh]

I’d say that is a consistent behaviour from the introduction of suspend

[Zach Klippenstein (he/him) [MOD]]

Nope, that’s always been the case, and it’s very common to call non-suspending functions from suspending ones.

[Andrey B.]

Okay guys, thank you so much for your help!

[Zach Klippenstein (he/him) [MOD]]

I really like how this article explains it

[Andrey B.]

I'd just freaking love this community! Thank you so much ❤️

[Andrey B.]

I def gonna read the article

[Andrey B.]

@Zach Klippenstein (he/him) [MOD] but will the non suspending function block the calling suspending one? 🤔

[Zach Klippenstein (he/him) [MOD]]

Yes. However, because you’re launching your coroutine on the IO dispatcher, it will run on a background thread and it won’t block your app’s main thread.

[Andrey B.]

Got it, thank you :)

[gildor]

One more addition, even if you mark function with suspend modifier, it doesn't mean that it automatically non-blocking, it just means that it can call other suspend functions

[Erik]

This is an excellent question, actually! Why would someone assume that non suspending functions should be callable from a coroutine context?