Railo 4.2 Reference
Choose a tag:

Tag <CFLOCK>

Provides two types of locks to ensure the integrity of shared data: Exclusive lock and 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 can start executing inside the tag while a request has an exclusive lock. Railo 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 be used only when the shared data is read only and not modified. If another request already has an exclusive lock on the shared data, the request waits for the exclusive lock to be released.

Body

This tag must have a body.

Example

	<cflock
[name="string"]
[scope="string"]
[throwontimeout="boolean"]
timeout="object"
[type="string"]>
</cflock>
This tag is also supported within cfscript
	<cfscript>
lock
[name="string"]
[scope="string"]
[throwontimeout="boolean"]
timeout="object"
[type="string"] {
}
</cfscript>

Attributes

The attributes for this tag are fixed. Except for the following attributes no other attributes are allowed.
Name Type Required Description
name string No Specifies the name of the lock. Only one request can execute inside a cflock tag with a given
name. Therefore, providing the name attribute allows for synchronizing access to resources from
different parts of an application. Lock names are global to a server. They are shared
between applications and user sessions, but not across clustered servers. This attribute is mutually
exclusive with the scope attribute. Therefore, do not specify the scope attribute and the name attribute
in a tag. The value of name cannot be an empty string. 
scope string No Specifies the scope as one of the following: Application, Server, or Session. This attribute is mutually
exclusive with the name attribute. 
throwontimeout boolean No Yes or No. Specifies how timeout conditions are handled. If the value is Yes, an exception is
generated to provide notification of the timeout. If the value is No, execution continues past the
cfclock tag. Default is Yes. 
timeout any Yes Specifies the maximum amount of time, in seconds, to wait to obtain a lock. If a lock can be
obtained within the specified period, execution continues inside the body of the tag. Otherwise, the
behavior depends on the value of the throwOnTimeout attribute. 
type string No readOnly or Exclusive. Specifies the type of lock: read-only or exclusive. Default is Exclusive.
A read-only lock allows more than one request to read shared data. An exclusive lock allows only one
request to read or write to shared data.