Data Manipulation Language Statements › #ENQ—acquires resources or tests for availability

#ENQ—acquires resources or tests for availability

The #ENQ statement acquires resources or tests for availability of a resource or list of resources. Defined during installation, resources can be storage areas, common routines, queues, and processor time.

An enqueued resource can be exclusive or shared:

• Exclusive specifies that the resource is owned exclusively by the issuing task and is not available to any other tasks. The system prohibits other tasks from issuing #ENQ requests for exclusive resources.
• Shared specifies that the resource is available for use by all tasks. The system allows other tasks to issue nonexclusive #ENQ requests for the resources, permitting the resources to be shared.

An exclusive #ENQ request prohibits another task from enqueuing a resource by name; however, it does not prohibit the use of the resource by another task. Therefore, to effect queue resource protection, you must apply the enqueue/dequeue mechanism consistently, according to your site standards.