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kotlinlang

<https://kotlinlang.slack.com/archives/C0922A726/p1536783109000100>

<https://github.com/Kotlin/kotlin-coroutines/blob/master/kotlin-coroutines-informal.md#wrapping-callbacks>

though you probably need slightly other link

&gt; how do I convert/wrap those blocking database/http calls into async calls
there is no real way to convert blocking calls to real non-blocking, no such magic.
But you always can wrap blocking call to coroutine that runs this blocking call on a separate thread (and blocks it), but for user of this API it looks as async API and doesn’t block thread where it invoked.
Simplest way (with new IO disptatcher)

```suspend fun someDbCall(sql:String) =    withContext(<http://Dispatchers.IO|Dispatchers.IO>) {
      someBlockingDbCall(sql)
 }```