Starting Local Sync Point TPs

Local TPs are created by issuing the TP_STARTED verb to Host Integration Server. The TP_STARTED verb has been modified by adding the new verb control block (VCB) member syncpoint_rqd to allow a TP to specify that it requires Sync Point services.

By setting syncpoint_rqd to AP_YES, a TP indicates that it requires Sync Point services from Host Integration Server. A value of AP_NO (the default) indicates that Sync Point services are not required.

Since this member cannot be incorporated within the existing TP_STARTED VCB, the TP must use a larger VCB structure. To indicate that the VCB is longer than usual, the opext member of the VCB must be combined using OR with the value AP_EXTD_VCB before calling APPC.

Conversations started by TPs requiring Sync Point support will be routed only by the Host Integration Server software running on the same computer. They will not be routed to other LAN-attached servers.