Dispatcher Domain Exits Xdsbwt And Xdsawt - IBM SC34-6814-04 Customization Manual

Exit-specific parameters
Return codes
XPI calls

Dispatcher domain exits XDSBWT and XDSAWT

The XDSBWT and XDSAWT exit points are located before and after the operating
system wait. CICS services cannot be used in any exit program invoked from these
exit points.
The XDSBWT and XDSAWT exits can be used to control the swapping state of the
CICS address-space. It should be noted, however, that if the default state of the
address-space is non-swappable then these exits cannot be used to override this
state.
CICS uses a counter which is incremented for every SYSEVENT DONTSWAP
request and decremented for every SYSEVENT OKSWAP request down to a
minimum of 0. A SYSEVENT DONTSWAP request is issued when this counter goes
up from 0 to 1. A SYSEVENT OKSWAP request is issued when this counter goes
down from 1 to 0. In all other circumstances, the SYSEVENT is not issued.
Exit XDSBWT
When invoked
Exit-specific parameters
Return codes
UEPDBXR
Address of CICS XRF information for use with DBCTL. The CICS
XRF information can be mapped using the DSECT DFHDXUEP.
UERCNOAC
Take no action.
UERCSWCH
Switch to the alternate DBCTL.
UERCABNO
Abend CICS without a dump.
UERCABDU
Abend CICS with a dump.
The return code UERCNORM is not available for use at this exit point.
The following must not be used:
v INQUIRE_MONITORING_DATA
v MONITOR
v TRANSACTION_DUMP
v WRITE_JOURNAL_DATA.
Before an operating system wait issued by the quasireentrant CICS TCB.
None.
UERCNORM
Continue processing.
UERCSWAP
Issue SYSEVENT to allow address-space swapping.
Chapter 1. Global user exit programs
47