Registration services allow a resource manager to define itself to the operating system. A resource manager is a program that controls and manages access to a resource.

Examples of resource managers are a database manager that works with RRS to protect resources, a work manager that uses the context services component, and a communications resource manager that handles protected communications, such as Advanced Program-to-Program Communication/MVS (APPC/MVS).

As part of registration, a resource manager identifies itself and its exit routines, if any, to exit managers, which have registered with the system. An exit manager invokes an exit routine when a specific event occurs. Examples of exit managers are context services and resource recovery services.

The registration services are:

For information on the calls, see Callable registration services.

An authorized resource manager can provide an exit routine to be invoked to notify the resource manager about events related to registration, such as when an exit manager becomes registered or unregistered, or when your resource manager exit routines have become unset. Although the notification exit routine is optional, it is a good idea to provide one; it can report events that are important to your resource manager. The registration services exit routine is:

NOTIFICATION exit routine describes the routine.