I would call this a Mutex and would name accordingly. Maybe something like Process::Mutex?
There are a few mutex implementations already on CPAN. I have used the Win32::Mutex module a bit in my development.
If you are going to create a generic module, I would provide different solutions depending on the OS. The above solutions using flock should work well on *nix systems while the Win32::Mutex provides an interface for Windows.
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