On Windows, I used Win32::Mutex to ensure that a process was not already running.

However, I seem to remember that this only worked on a per user basis and did not prevent another user from running the same script. But since I was running using a scheduled task, it worked well.

In reply to Re: Ensuring only one copy of a perl script is running at a time by tokpela
in thread Ensuring only one copy of a perl script is running at a time by eyepopslikeamosquito

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