Hi!

I think I'm in a problem. I have two TCP apps connected to each other which use winsock I/O completion ports to send/receive data (non-blocking sockets).

Everything works just fine until there's a data transfer burst. The sender starts sending incorrect/malformed data.

I allocate the buffers I'm sending on the stack, and if I understand correctly, that's a wrong to do, because these buffers should remain as I sent them until I get the "write complete" notification from IOCP.

Take this for example:

void some_function()
{
    char cBuff[1024];

    // filling cBuff with some data

    WSASend(...); // sending cBuff, non-blocking mode

    // filling cBuff with other data

    WSASend(...); // again, sending cBuff

    // ..... and so forth!
}

If I understand correctly, each of these WSASend() calls should have its own unique buffer, and that buffer can be reused only when the send completes.
Correct?

Now, what strategies can I implement in order to maintain a big sack of such buffers, how should I handle them, how can I avoid performance penalty, etc'?
And, if I am to use buffers that means I should copy the data to be sent from the source buffer to the temporary one, thus, I'd set SO_SNDBUF on each socket to zero, so the system will not re-copy what I already copied. Are you with me? Please let me know if I wasn't clear.