The resource manager exit is called before write or delete event
completion is reported to the unit of work that initiated the IXGWRITE
or IXGDELET service request. Any additional processing by the exit
that results in thread suspension or affects thread response time
should be performed under a different work unit.
The resource manager exit must be prepared to receive control
in either SRB or task mode. The exit should run with an EUT FRR for
recovery. While the FRR remains in effect, no SVCs can be issued,
no new asynchronous exits are dispatched, and no vector instructions
can be executed. See z/OS MVS Programming: Authorized Assembler Services Reference SET-WTO for
information on the SETFRR service.
All storage obtained by the resource manager exit should be associated
with the TCB that owns the cross-memory resources for that address
space, whose address is the ASCBXTCB.
You can access the input parameter data area only while your resource
manager exit is running. If you want to save the parameter information
for later processing, make a copy of it before your resource manager
exit returns control to the system.