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CFLOCK

The CFLOCK tag provides two types of locks to ensure the integrity of shared data:

• exclusive lock

• read-only lock

An exclusive lock single-threads access to the CFML constructs in its body. Single-threaded access implies that the body of the tag can be executed by at most one request at a time. A request executing inside a CFLOCK tag has an "exclusive lock" on the tag. No other requests are allowed to start executing inside the tag while a request has an exclusive lock. ColdFusion issues exclusive locks on a first-come, first-served basis.

A read-only lock allows multiple requests to access the CFML constructs inside its body concurrently. Therefore, read-only locks should only be used when the shared data will only be read and not modified. ...