@drewdevault how exactly does async I/O differ from I/O multiplexing in your understanding?

I/O multiplexing is IIUC having a single thread of execution and using poll() / epoll() / select() / ... to periodically check which I/O is ready and then handling that (either directly or via callbacks). Most nontrivial programs that do that do it via callbacks and an event loop.

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@miki