RSC/MP 7.2 Programming Manual

RSC/MP Sessions

HP NonStop Remote Server Call (RSC/MP) Programming Manual—522360-004

4-2

Session Types

RSC/MP supports two session types: Interprocess and IDS. This section lists the

features of each session type, describes options that need to be set and other setup

requirements for each session type.

The Interprocess Session Type

An Interprocess session provides the following features:

•

Communicates with Guardian named processes

•

Communicates with Pathway servers

•

Allows client applications to control TMF transactions.

•

Sends up to 56000 bytes per message to a named server; up to 31000 bytes to a

Pathway server.

•

Sends nowaited I/O to the NonStop system.

Interprocess sessions can use two different delivery mechanisms:

•

Process-to-process (PTP)—used with Guardian processes

•

Pathsend—used with Pathway servers

After the application has established an Interprocess session, it can issue RscWrite

and RscWriteRead calls using either delivery mechanism. The ServerName parameter

supplied to the RscWrite or RscWriteRead function selects the delivery mechanism.

Interprocess, Process-to-Process Delivery Mechanism

An Interprocess Process-to-Process session communicates with Guardian named

processes. A Guardian Named Process is any process which has a unique name and

does not run under a PATHWAY environment.

The Guardian named process is opened when the first RscWrite or RscWriteRead call

is made, and implicitly closed when the RSC session ends.

Select the Process-to-Process delivery mechanism by calling RscWrite or

RscWriteRead with a Servername whose first character is a dollar sign ($) or

backslash (\).

Interprocess, Pathsend Delivery Mechanism

An Interprocess Pathsend accesses Pathway servers using the PATHSEND system,

which controls the starting and stopping of server processes. The PATHMON_NAME

option controls which PATHMON is used. Set this option before calling

RscBeginSession. The setting in effect when RscBeginSession is called remains in

effect for the duration of the session.