RSC/MP Programming Manual

RSC/MP Sessions

Interprocess and IDS Session Comparison

This table summarizes the features of the Interprocess and IDS session types.

Feature

Interprocess

IDS

Server Types

Pathway Servers

Named Processes

Pathway Servers

Dependencies

IDS requester

Message Size

56000 for Pathway

Servers

56000 for Named

Processes

8192

Concurrent nowaited

I/Os per session

65535

Supported I/O Types

RscWriteRead

RscWrite

RscWriteRead

Client accessible TMF

Yes

RscBeginTransaction

RscEndTransaction

RscAbortTransaction

Unsolicited Messages

The Unsolicited Message System (UMS) allows programs running on the NonStop

host to send unsolicited messages to the RSC/MP application. These messages are

routed to the RSC/MP session using aliases that the application establishes through

the option settings. UMS operations are associated with the session as a who le and

not with any particular RscWrite or RscWriteRead call. UMS is independent of the TMF

transaction feature.

Validating a Session

The API maintains a list of active sessions, including their session handles. On every

API call using a session handle, the value for that session handle is validated against

the list of active session handles. If an invalid session handle is received, the API

returns an API error 15 (―The specified session handle is not valid‖).

HP NonStop Remote Server Call (RSC/MP) Programming Manual — 522360-006

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