Transaction Scheduler User Exits

Transaction schedulers need to provide the following user exit routines to perform certain functions.

XCF message user routine
Each transaction scheduler must provide an XCF message user routine to obtain information about general APPC/MVS events and to receive inbound allocate requests that are directed to the scheduler.
Extract exit
Transaction schedulers must supply an extract exit routine if they:
- Call the ATBEXAI service to extract information about their scheduling
- Run more than one transaction program in their address space simultaneously, and one of the TPs issues an Allocate, Get_TP_Properties, or Get_Conversation request.
TP profile conversion exit
Schedulers can provide an exit routine to convert a TP profile on its first reference and store the converted form of the profile for future reference, thus avoiding repeated conversion and potentially improving performance.
TP profile syntax exit and message routine
Schedulers can provide an exit routine to check the syntax of scheduler-specific information before it is added to the TP profile. An associated message routine can issue messages about syntax errors to the SYSPRINT data set.