> On session variables, they are only related to the session, so no matter how
> many users you have on line only the current session can be doing anything
> to the 'instances' of session variables that belong to it. Again, therefore,
> I can't see why you'd need to lock accesses to them. We don't use 'server',
> so I have no comments about those.
here's an excerpt from the allaire kb article on locking:
http://www.allaire.com/Handlers/index.cfm?ID=14165&Method=Full
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It is easy to imagine that an application with many users (browsers) may
be trying to read and/or write server and application variables at the
same time, but it's not so evident with session variables.
Session variables are per browser session, so how can a browser request
attempt to access the same variable at the same time?
If you understand the way that browsers work, then you know that they
can have several simultaneous threads between the browser and the
server. This makes processing much faster, since the browser can get
many of the page resources (images, framesets, etc.) at the same time
instead of one by one. Most of today's browsers have 4 simultaneous
threads going against the web server at the same time. (AOL browsers
only use 2.)
Since ColdFusion is usually set up to handle many requests from the web
server at the same time (using the Simultaneous Requests setting in the
ColdFusion Administrator), it is also possible that the simultaneous
browser requests are being processed at the same time by ColdFusion.
Therefore, it is possible that more than one page in a frameset be
processed at the same time. If those pages all access shared memory
variables, it is possible to cause a collision when processing, even
within a single session.
Also, if a user becomes impatient for a single page load and hits the
reload/refresh button, it is also possible that the same page be
accessed twice and simultaneously. Therefore, any access to shared
variables is also a problem.
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