application.cfc example bug cflock scope session or application

It should be (B). The documentation says this elsewhere.

To see this, click on your own link above. Scroll to the table in the section "Using application event handlers". Click on the link OnSessionStart. You will see the same sample code, this time with session="application".

Don't be confused... it's an error in the docs.  You could do Adobe a favour by commenting at the bottom of the page: they do monitor those comments (they don't always react, but the do monitor them).

onSessionStart() is intrinsically single-threaded as far as the session scope goes: it's only ever run once per session (when the session starts...).

On the other hand the code in question def wants to single-thread access to that application-scoped variable as we don't want two simultaneous sessions hitting it for any given single value of it (if that makes sense).

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Adam