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SYNCPT Verb Issued Remotely

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Image that shows a SYNCPT verb issued remotely.
SYNCPT verb issued remotely.

  1. The local TP issues a RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAITverb (depending on whether a basic or mapped conversation is being used) to receive data from the remote transaction program. The vendor API passes the verb transparently to Host Integration Server.

  2. The RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb completes with what_rcvd = AP_PS_HEADER. The data buffer contains a PREPARE PS header.

  3. Another RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb is issued by the vendor API to receive the send indication from the remote TP.

  4. The vendor API returns the transaction program's RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb with the what_rcvd field of the VCB set to TAKE_SYNCPT.

  5. The transaction program issues a SYNCPT verb.

  6. The vendor API generates a REQUEST_COMMIT PS header and transmits it using a SEND_DATA or MC_SEND_DATA verb. If the conversation is mapped, the MC_SEND_DATA verb is issued with the data_type field of the VCB set to AP_PS_HEADER.

  7. The vendor API then issues a RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb to give the remote TP direction to send.

  8. The RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb completes with the what_rcvd field of the VCB set to AP_PS_HEADER. The data buffer contains a COMMITTED PS header.

  9. Another RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb is issued to get permission to send.

  10. A FORGET PS header is prepared and sent to the remote transaction program.

  11. The FORGET is flushed and direction given to the remote transaction program by issuing a PREPARE_TO_RECEIVE or MC_PREPARE_TO_RECEIVE with the ptr_type field of the VCB set to AP_FLUSH.

  12. When the PREPARE_TO_RECEIVE or MC_PREPARE_TO_RECEIVE verb completes, the vendor API returns the SYNCPT verb to the local transaction program.