Rules for creating, deleting, and using hiperspace

To protect data spaces from unauthorized use, the system uses certain rules to determine whether a program can create, delete, or extend a hiperspace or whether it can access data in a hiperspace. The rules for problem state programs with PSW key 8 through F differ from the rules for programs that are supervisor state or PSW key 0 through 7. Table 1 summarizes these rules:

Table 1. Creating, deleting, and using hiperspace
Function	Type of hiperspace	A problem state, key 8 - F program:	A supervisor state or key 0-7 program:
CREATE	Non-shared standard	Can create a non-shared standard hiperspace.	Can create the hiperspace if its primary or home address space is the same as the intended owner's home address space.
CREATE	Shared standard and ESO	Cannot create shared or ESO hiperspaces.	Can create the hiperspace if its primary or home address space is the same as the intended owner's home address space.
DELETE	Non-shared standard	Can delete the non-shared standard hiperspaces it owns if its PSW key matches the storage key of the hiperspace.	Can delete a non-shared standard hiperspace if its primary or home address space is the same as the owner's home address space.
DELETE	Shared standard and ESO	Cannot delete a shared standard or ESO hiperspace.	Can delete the hiperspace if its primary or home address space is the same as the owner's home address space.
RELEASE	Non-shared standard	Can release storage in its non-shared standard hiperspaces if its PSW key matches the storage key of the hiperspace.	Can release storage in a non-shared standard hiperspace if its primary or home address space is the same as the owner's home address space and its PSW key matches the storage key of the hiperspace.
RELEASE	Shared standard and ESO	Cannot release storage in a shared standard or ESO hiperspace.	Can release storage in the hiperspace if its PSW key matches the storage key of the hiperspace.
EXTEND	Non-shared standard shared standard and ESO	Can extend the current size only if it owns the hiperspace.	Can extend the current size.