There's a rather famous blog post that cuts to the heart of all this: https://blog.izs.me/2013/08/designing-apis-for-asynchrony/ https://blog.izs.me/2013/08/des

There's a rather famous blog post that cuts to the heart of all this: https://blog.izs.me/2013/08/designing-apis-for-asynchrony/ https://blog.izs.me/2013/08/designing-apis-for-asynchrony/