Agreed. It's one of the reasons why I wrote lthread. Implementing any non-trivial protocol over a socket for example will lead to callback hell. There are plent

Agreed. It's one of the reasons why I wrote lthread. Implementing any non-trivial protocol over a socket for example will lead to callback hell. There are plenty of states to transition from/to and it's very easy to get it wrong no matter how good the code is structured. Forget Javascript for a second, and take a look at a typical http proxy written in C using callbacks to see what a callback hell looks like. If 5 developers are working on such a project, it will require a lot of mental effort from each developer to keep the callback flow up-to-date in their head.