The only thing you can do is spawn a new thread and then use a rather inefficient busy loop to poll its completion. This is how I did stdin reading in Chapter 3 of Nim in Action, you can use it as an example: <https://github.com/dom96/nim-in-action-code/blob/master/Chapter3/ChatApp/src/client.nim#L42>
That said, I wouldn't recommend this. Hopefully soon we will have a better solution to this.
