DFHISP executable module

Entry points

DFHISPNA

Called by

DFHDLI, DFHEIP, DFHEIFC

Description

The intersystem communication program is invoked when a request to access a resource has to be shipped to a remote system (through ISC or MRO).

These requests are passed to DFHISP:
  • File control
  • Interval control
  • Temporary storage
  • Transient data
  • DL/I

DFHISP controls the acquisition, use, and freeing of a session to the remote system, and invokes DFHXFP or DFHXFX to process requests and replies. Two user exits are provided in DFHISP: XISCONA can be used to control the queuing of requests from DFHISP to allocate intersystems sessions and XISLCLQ can be used to override the LOCALQ option of the transaction attributes. XISCONA is invoked for any function-shipping requests that cannot be processed immediately. XISLCLQ supports the local queuing of function-shipped START NOCHECK requests when the link to the remote system is out of service. If a START NOCHECK request is queued, DFHISP starts the CMPX transaction when the link is brought into service.