HP 3000 Manuals HP 3000 Manuals
Appendix D Migration From PTOP to NetIPC and RPM
The PTOP (Program-to-Program communication) service is available on
DS/3000 and NS3000/V. It is a master-slave protocol wherein a master
process creates a slave process on a remote node, the master sends
data-exchange requests to the slave, and the slave accepts or rejects the
master requests.
The NetIPC (Network InterProcess Communication) and RPM (Remote Process
Management) services are available on NS3000/V and NS3000/XL. These
services provide a more flexible alternative to PTOP for developing
distributed applications. Since PTOP is not supported on NS3000/XL, any
PTOP application to be migrated to an MPE XL system must be rewritten to
use NetIPC and RPM. These guidelines provide steps for the conversion.
A distributed application using PTOP or NetIPC/RPM can be divided into
three phases:
* Creation of the remote (slave) process and the establishment of a
communications channel between the local (master) and the remote
(slave) processes.
* Data exchange over the communications channel.
* Process termination and the shut down of the communications channel.
The rest of this appendix is divided according to creating processes,
exchanging data, and terminating processes. The sections are then
subdivided according to what you have to do on a master program and on a
slave program.