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With FILE_SHARE_DELETE there shouldn't be any particular problem, but I certainly want to test this with the posix flags you had in mind. Do you happen to have a minimal example that you deem problematic on Windows?

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If you delete the backing file of (or perhaps even close its handle -- I don't remember) a memory-mapped file, you get VERY bizarre behavior in Windows. I don't remember what it was, but I remember I did it and the behavior I got was quite nonsensical.

has been a while since I tried it. it was basically

open rw, set length, mmap from two 2 processes to have shared memory, unlink & close.

expected behavior is to have a chunk of shared memory without the tempfile in the directory tree

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