Guardian Procedure Calls Reference Manual (G06.25+)

Guardian Procedure Calls (R)
Guardian Procedure Calls Reference Manual—522629-013
13-71
RESIZESEGMENT Procedure
Considerations
•
The following extended data segment types cannot be resized (an attempt to do so
results in an error 2):
•
An extended data segment allocated in the I/O space (IOS)
(a segment with a segment ID greater than or equal to 3072).
•
A read-only extended data segment (created by calling
SEGMENT_ALLOCATE_ with a
segment-type parameter of %060000 or by
calling ALLOCATESEGMENT with a
pin-and-flags parameter of
%060000).
The following types of public absolute references are adjusted by
RESIZESEGMENT if required:
•
The message buffer pointers in message system control blocks (except for
resident cache segments)
•
The lock addresses in LOCKWAIT elements
•
The dump, comparison, and memory access breakpoint (MAB) addresses in
breakpoint (BPT) entries
•
Memory access breakpoints (MABs) set in the deallocated portion of the
extended data segment are removed.
•
A call to RESIZESEGMENT that shrinks an extended data segment causes the
area beyond the
new-segment-size to be deallocated. Dirty pages are not
written back to a permanent swap file.