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It says that it is also backed by kqueue and supports FreeBSD , NetBSD, and OS X. I found this issue where they're discussing rewriting the Windows implementat

• Const-me 7y ago
  > rewriting the Windows implementation using the library `wepoll`. Interesting idea but I don’t like it too much. While removing the huge complexity of manually managing IOCP and required resources, It’s an undocumented API. New Vista+ threadpool-based IO also removes that complexity, removes complexity of implementing thread pools in the higher level in Tokyo. It’s documented and supported, and Rust has issues with WinXP support anyway. > What would be the advantages of supporting AIO on Linux? Faster async disk IO for the apps which are OK with the limitations, i.e. which read/write complete blocks of O_DIRECT files. Databases come to mind. BTW, io_uring feature coming into Linux kernel removes most limitations of AIO while also improving performance.