subscriber

The subscriber. 

event_ref

The event reference. This is a URI identifying the event’s source. 

notify_cb

The callback invoked upon receipt of a notification matching this subscription. 

notify_arg

The first argument of notify_arg. May be called at any time, by any thread, while the subscription is still active.

cbdone

Called when an unsubscribe completes. It has three Parameters: 

• cbarg (see below).

• Status code.

• A pointer to an opaque subscription object.

cbarg

The first argument of cbdone.