Jun Wu 5c66d921c6 util: implement a symlink-based atomic_write ... Summary: This diff aims to solve `atomic_write` issues on Windows. Namely: - `tempfile` left overs if temp files are not deleted on Drop. - `tempfile` does unnecessary `chmod`. - For mmap-ed files, it has to be deleted before `atomic_write`, causing reader to have a chance to see inconsistent data. This diff solves the above issues by: - Use extra GC to clean up older files. Do not realy on successful `Drop`. - Do not use `tempfile` and do not set permissions. - Use a symlink so the symlink can still be atomic-replaced while the real content is being mmaped. Reviewed By: DurhamG Differential Revision: D22225039 fbshipit-source-id: d45bb198a53f8beeef71798cdb9ae57f9b4b8cd3		2020-06-25 13:56:12 -07:00
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src	util: implement a symlink-based atomic_write	2020-06-25 13:56:12 -07:00
Cargo.toml	util: add PathLock	2020-06-25 13:56:12 -07:00