Whether or not rename(2) will be atomic depends very much on the operating and file systems. Unfortunately File::Copy's move adds another layer of uncertainty, since it doesn't guarantee to use rename under the hood. But then again, when the rename operation is atomic, it's a great way for updating a file with one writer and many readers (multiple writers still need to coordinate). You might be interested in my module File::Replace.

In reply to Re: Safely read/write a file simultaneously by haukex
in thread Safely read/write a file simultaneously by golux

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