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> That said, I’ve read people here saying[1] that overlapped I/O on Windows also works by scheduling operations on a thread pool

The _kernel_ thread pool. Eventually, most work has to be done in an actual thread, after all.

> [2] https://support.microsoft.com/kb/156932

It's a bit misleading. What they mean is that some operations can act as barriers for further operations. E.g. async calls to ReadFile won't run until the call to WriteFile finishes (if it's writing past the end of the file).



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