DFHTPS executable module

The terminal page scheduling program (transaction CSPS) is invoked for each terminal type to which a BMS logical message built with TYPE=STORE is to be sent. For each terminal designated by the originating application program, DFHTPR is scheduled to display the first page of the logical message if the terminal is in paging status, or the complete message if it is in autopage status. DFHTPS contains the following major subsections, each dealing with a separate function:

• DFHTPSNA—used when DFHTPS is invoked by automatic initiation on expiry of ICE, and as a result of an IC PUT request issued by DFHMCP (there is no associated terminal). This invocation schedules CSPG for terminals on this system, and schedules CSPS on the link to each remote system which owns terminals contained in the route list for the message (that is the function of TPS02000).
• TPS01000—used when DFHTPS is linked to from DFHMCP for direct paging requests to a terminal on a remote system. The task has a surrogate TCTTE as its primary facility, and owns a relay link connected to the terminal owning system. This section ships the pages of the message to the terminal-owning region, where it is re-created by the relay program (DFHAPRT) which issues BMS, STORE, TEXT, NOEDIT, and PAGEOUT requests.
• TPS02000—used when DFHTPS is scheduled by TPS01000 to run against the link to a remote system. This routine ships the logical message to the remote system and deletes the terminals on the remote system from the terminal list in the original message control record. (TPS03000 receives the information at the remote system.)
• TPS03000—used when DFHTPS is invoked by an ATTACH request from a remote system (that is, originated by TPS01000 or TPS02000). This routine receives the shipped logical message and issues BMS ROUTE, TEXTBLD, NOEDIT, and PAGEOUT requests to re-create the logical message on the terminal-owning region.

DFHTPS contains the following subroutine:

• TPSSHIPM—ships a complete logical message.