file locking

How and why to lock data files with Perl

Two of the Perl questions we're often asked are:

  • "Why should I lock my data files when I'm writing to them?"
  • "How do I lock my data files with Perl?"

Here's a quick tutorial that demonstrates both the "why" and "how" of data file locking with Perl.

By Alvin Alexander on May 18, 2011

Perl flock - file locking with Perl

Perl flock FAQ: Can you show me how to lock a file with the Perl flock function?

Sure, here are a couple of quick file-locking examples with Perl and the Perl flock function.

Perl flock example #1

In the first Perl flock example I'll show how to lock a file, but I'll intentionally do it in a bad way, and lock a file for roughly 20 seconds while I write records to it and sleep in between the writes:

By Alvin Alexander on August 30, 2011
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