The current z/OS 1.7 program management manual defines this hierarchy as:
The reusability values are:
NONE The module cannot be reused. A new copy must be brought into virtual
storage for each > use. NONE is the default value.
SERIAL The module is serially reusable. It can only be executed by one task
at a time; when one > task has finished executing it another task can
begin. A serially reusable module can modify its
own code, but when it is reexecuted it must initialize itself or restore
any instructions or data that > have been altered.
RENT The module is reenterable. Another task can begin executing it before
a previous task has > completed execution. A reenterable module cannot
modify its own code. (MVS protects your modules virtual storage so that
your module cannot be modified.) Reenterable modules are also serially
reusable.
REFR The module is refreshable. It can be replaced by a new copy during
execution without changing the sequence or results of processing. A
refreshable module cannot be modified during > execution. A module can only
be refreshable if all the control sections within it are refreshable. The
refreshable attribute is negated if any input modules are not refreshable.
Refreshable modules are also reenterable and serially reusable. The
refreshable attribute can be specified for any nonmodifiable module.
Any proposals that radically reinterpret these terms are all but certain to
be shot down by reason of incompatibility with what was and is.
John Gilmore
Ashland, MA 01721-1817
USA
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