Apache::Session can do the kind of exclusive locking you are after. If you're not using the MySQL locking, make sure you're passing "Transaction => 1". However, it would be better to move this kind of work to direct database actions so that you can get better control over the concurrency and locking behavior.

Sessions are good for things that are mostly read-only and don't change often (e.g. user's name). They're not so great for things that need carefully controlled locking behavior. Part of the issue is that when you use exclusive locking, a person opening a second window on your site will not get any content until the first window completes sending to the browser. That's the nature of exclusive locks.

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