cflock

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 <cflock timeout = "timeout in seconds "           scope = "Application or Server or Session"           name = "lockname"           throwOnTimeout = "Yes" or "No"           type = "readOnly" or "exclusive">           <!--- CFML to be synchronized --->  </cflock> 

Description

Ensures the integrity of shared data. Instantiates the following kinds of locks:

• Exclusive. Enables single-thread access to the CFML constructs in its body. Can only be executed by one request at a time and no other requests can start executing when the request has an exclusive lock. ColdFusion issues exclusive locks on a first-come, first-served basis.

• Read-only. Creates a read-only lock that does not enable data to be modified but enables multiple requests to access data concurrently.

Attributes

timeout (Required)

Maximum length of time to wait to obtain a lock.

scope (Optional)

Mutually exclusive with the name attribute. Options are Application, Server, or Session.

name (Optional)

Lock names are shared among applications and user sessions so that a lock can be used in different parts of an application. Only one request can execute within a given name.

throwOnTimeout (Optional)

Default: Yes

• Yes. Exception is generated for the timeout.

• No. Execution continues past this tag.

type (Optional)

Default: exclusive

• read-only. Lets more than one request read shared data. Note that if performance is an issue, the read-only lock is faster than the exclusive lock.

• exclusive. Lets one request read or write shared data.