HP-UX SNAplus2 R7 APPC Programmer's Guide

Concepts

Syncpoint Support

• [MC_]RECEIVE_IMMEDIATE

Send-Expedited queue

For each active conversation (either full-duplex or half-duplex), there is a single queue that handles the

following verbs:

• [MC_]REQUEST_TO_SEND (half-duplex conversations only)

• [MC_]SEND_EXPEDITED_DATA

Receive-Expedited queue

For each active conversation (either full-duplex or half-duplex), there is a single queue that handles the

following verbs:

• [MC_]RECEIVE_EXPEDITED_DATA

The following conversation verbs are not associated with any queue and so can be issued at any time regardless of

the verbs already queued. The non-blocking mode option in the

opext parameter of the verb is ignored.

• GET_TYPE

• [MC_]GET_ATTRIBUTES

• [MC_]TEST_RTS

• [MC_]TEST_RTS_AND_POST

APPC control verbs are always issued in blocking mode.

1.12 Syncpoint Support

UNIX

The SNAplus2 APPC API provides support for sessions and conversations that use LU 6.2 Syncpoint protocols.

This means that it can be used in conjunction with transaction monitors that require Syncpoint Level 2 support. It

does not itself provide the components necessary for a full Syncpoint implementation, but provides the underlying

support for a vendor-supplied implementation. The vendor must provide the following components:

• Syncpoint Manager (SPM)

• Conversation-Protected Resource Manager (C-PRM)

• Resynchronization TP

This manual does not attempt to explain Syncpoint functions; it describes only the support that SNAplus2 provides

to enable them to be implemented. If you are developing a Syncpoint Manager for use with SNAplus2 APPC, you

should already be familiar with Syncpoint concepts; refer to the IBM LU 6.2 manuals listed in Related Publications

for more information if necessary.

Some parameter and return code values in this manual are marked “only used by TPs that support Syncpoint

processing” or “only used if the conversation’s sync_level is AP_SYNCPT”. If you are writing APPC applications

that do not use Syncpoint functions, do not attempt to use these parameters. In most cases, the Syncpoint Manager is

responsible for converting between these values and the appropriate Syncpoint functions, as noted in the parameter

descriptions.

If you are writing applications to work with a Syncpoint implementation provided by your SNAplus2 supplier or by

another vendor, the vendor should provide you with the additional information necessary to use this implementation.