TS/MP 2.5 System Management Manual

6 Managing the Pathsend Environment
The Pathsend Environment
This section discusses the Pathsend environment, which consists of Pathsend processes and ACS
subsystem processes, and the tasks you perform to manage the Pathsend environment. For more
information on ACS subsystem core processes, see the TS/MP 2.5 Release Supplement.
Pathsend Processes
Pathsend processes are user-written Guardian programs that use Pathsend procedure calls to
communicate with server classes. The Pathsend procedure calls are part of the operating system
library.
For more information about the Pathsend procedure calls and Pathsend processes, see the TS/MP
2.5 Pathsend and Server Programming Manual.
ACS Subsystem Core Processes
Together with the PATHMON process, the ACS subsystem controls communication between Pathsend
requestor processes and server classes. As a benefit, the ACS Subsystem provides higher Pathsend
limits and better link management over TS/MP 2.0 LINKMON process. The properties of the ACS
Subsystem core processes are described in the subsections that follow.
• “ACS Subsystem Core Tasks” (page 109)
• “Communication With the PATHMON Environment” (page 109)
• “Execution” (page 109)
• “Process Names” (page 110)
• “Initialization” (page 111)
• “Limits” (page 111)
• “Extended Memory” (page 111)
• “ACS Subsystem Memory Dumps” (page 111)
ACS Subsystem Core Tasks
ACS subsystem core processes a multitasking environment that handles the interface to Pathway
servers from requestors other than SCREEN COBOL requestors. These requestors include the
Pathsend processes, such as those created by RSC on behalf of the workstation clients.
The ACS subsystem gathers statistics for servers. For more information, see “Tuning Your System
by Using Statistics” (page 117).
Communication With the PATHMON Environment
The Process Broker (PB) process in the ACS subsystem communicates with the PATHMON
environment only if it has a link to a server process running in that environment. When the PB
process no longer has any links to any server process in a PATHMON environment, it terminates
its connection to that environment.
NOTE: For more information on the PB process, see the TS/MP 2.5 Release Supplement.
Execution
The ACS subsystem supports access to server classes by requestor programs written in TAL, C,
C++, COBOL, or Pascal. It supports access by assisting with the execution of Pathsend procedure
calls.
The Pathsend Environment 109