Pathway/iTS TCP and Terminal Programming Guide

Designing Your Application
Compaq NonStop™ Pathway/iTS TCP and Terminal Programming Guide—426751-001
2-21
Requesters Using GDSX
coordinate multiple GDSX device handler tasks or the GDSX device handler task can
directly communicate with a back-end line.
Figure 2-4
shows the path of a transaction from a general device to a Pathway server
through a GDSX process.
When developing a front-end process using GDSX, consider the following:
•
A GDSX front-end process is a good choice when a specified data communications
protocol is not supported by the Pathway TCP but is supported by GDSX.
•
A GDSX front-end process is also a good choice when performance is critical.
SCREEN COBOL may not be efficient enough to handle a large amount of
application function.
•
GDSX processes are managed either through the Subsystem Control Facility (SCF)
interactive interface or through a management application program using the
Subsystem Programmatic Interface (SPI).
Figure 2-4. GDSX as a Front-End Process
CDT 024.CDD
Database
Server Class
Server
GDSX
PATHMON
NonStop
SQL/MP
NonStop
TM/MP
TCP
IDS
General Device
LH
General Device
General Device
NonStop
TM
Himalaya System