What are use-cases for a coroutine?

Question

The concept of a coroutine sounds very interesting, but I don\'t know, if it makes sense in a real productive environment? What are use-cases for coroutines, that can be solved

Answer 1

Some good answers describing what coroutines are.

But for an actual use-case. Take a web server. It has multiple simultaneous connections, and it wants to schedule reading and writing all of them.

This can be implemented using coroutines. Each connection is a coroutine that reads/writes a small amount of data, then "yields" control to the scheduler, which passes to the next coroutine (which does the same thing) as we cycle through all the available connections.