Resource manager states

While processing protected resources, the resource manager passes through different states. The resource manager state determines the processing the resource manager can perform. Table 1 and the following topics describe the resource manager processing in the order in which it should occur. Table 1 also shows the state the resource manager is in before the processing and the state it is in after the processing.

Table 1. Resource Manager Processing and States
Resource manager processing	Resource manager state	Description
Registering	Before: Reset After: Registered	The resource manager registers itself with the operating system's registration services.
Setting exit routines	Before: Registered After: Set	The resource manager sets its exit routines by identifying them and their entry points. Note that the resource manager's EXIT_FAILED exit routine or the exit manager can unset the exit routines, leaving the resource manager in a registered state, but with its exit routines unset.
Restarting	Before: Set During: Restart After: Run	The resource manager restarts itself by retrieving and processing any URs that were incomplete from the last time the resource manager was running. Note that the process is the same for starting and restarting.
Expressing interest in a context	Run	When an application program requests access to a resource, the resource manager optionally expresses interest in the context associated with the application and the work request.
Expressing interest in a UR	Run	The resource manager expresses interest in the UR being processed by the application program.
Protecting the resource	Run	The resource manager changes or does not change the resource.