IWM4MGDD macro — Define Descriptions for Generic Delay States

Using this service, a subsystem can define descriptions for its 'generic delay states'.
The term 'generic delay states' in this context is related to service IWM4MCHS. It means the case when STATE=WAITING is specified and the resource that is specified is RESOURCE=TYPEx, where x is some number between 1 and 15.

With this service, descriptions can be defined that might be more intuitive to a human reader than the generic terms.
If defined, these descriptions will be accessible to performance monitors in the IWMWRCAA data area as a result of a call to the IWMRCOLL service.

Note, that for a subsystem that allows multiple instances (address spaces) to be active on the same z/OS system, only one set of descriptions can be in effect.
If more that one instance of such subsystem defines a set of definitions, the last one defined will be effective.

For a subsystem that allows the customer to run multiple instances at possibly different release levels on the same system, it might be helpful if each instance first checks whether there are already some descriptions defined for that subsytem, before the instance decides whether to define its own descriptions.