I’m noticing a little bit of inconsistent behavior...

# coroutines

[rook]

I’m noticing a little bit of inconsistent behavior with invokeOnCompletion. Given the following

launch(Dispatchers.Default) {
  val theJob = async(<http://Dispatchers.IO|Dispatchers.IO>) {}

  // do some work

  theJob.invokeOnCompletion { println() }
}

If do some work takes longer than theJob to complete, the handler block runs on Dispatchers.Default, whereas if theJob takes longer than do some work, the handler block runs on <http://Dispatchers.IO|Dispatchers.IO>.

[diesieben07]

From the docs (https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-job/invoke-on-completion.html):

Note: Implementation of CompletionHandler must be fast, non-blocking, and thread-safe. This handler can be invoked concurrently with the surrounding code. There is no guarantee on the execution context in which the handler is invoked.

[rook]

Thank you