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# coroutines

[Slackbot]

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

When you declare a function as a suspend function, the compiler actually emits a function that always returns Object, and takes an extra Continuation parameter. The Continuation is basically just a callback that the function can use to return a result asynchronously.

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

See this design doc: https://github.com/Kotlin/KEEP/blob/master/proposals/coroutines.md#continuation-passing-style

[Kroppeb]

What is the delay(0) for?

[Kroppeb]

Also, where is the launch being run in and what is the body of notifyVint

[Kroppeb]

Ah, I assume notifyVint is automatically generated to do a post request. However, whatever library you are using doesn't support suspended functions. Instead, remove the suspend modifier and wrap any call withContext(<http://Disparchers.IO|Disparchers.IO>){ ... }

[KotlinIsMyFav]

How do you know suspend function is not suuported? @Kroppeb

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

Presumably, if they were supported, you wouldn't get that exception. Retrofit is a library with a similar API as this looks to be (define an interface, annotate the methods), and It had to explicitly add support for coroutines by looking for functions that had that last coroutine parameter, constructing a continuation appropriately, and handling the special return value.