Sending Urgent Data on a SAN
If an application sends urgent data on a SAN, the Windows Sockets switch transfers that data as described in the following sequence:
For requests to send urgent data, the switch receives a WSPSend call in which the MSG_OOB flag is set.
The switch copies the urgent data to the payload portion of a control message buffer.
The switch calls the appropriate SAN service provider's WSPSend function to transmit the urgent data contained in the control message to the remote peer connection for a SAN socket. The SAN NIC in turn transmits the urgent data.
The switch at the remote peer receives the transmitted data into receive buffers that it posted with the WSPRecv function.
The switch at the remote peer copies the received data from the receive buffers to private storage.
The switch at the remote peer calls WSPRecv to repost the receive buffers.
The switch at the remote peer delivers the data to an application in accordance with standard Windows Sockets procedures.