[lwip-devel] [task #7865] implement non-blocking SEND operation (socket)

[Simon Goldschmidt]

Update of task #7865 (project lwip):

                  Status:                    None => Ready For Test         
        Percent Complete:                      0% => 90%                    
             Assigned to:                    None => goldsimon              

    _______________________________________________________

Follow-up Comment #7:

As described in last comment, I've added nonblocking write (for netconn and
sockets). Once such a nonblocking write failed, sent_tcp and poll_tcp will
check if there's enough buffer and mark the socket writable again.

Also, lwip_send() checks if the data would ever fit into the buffers and
returns EMSGSIZE if not - I'm not sure what's the correct error here...

There's one lwIP-related problem: when a nonblocking write fails and poll_tcp
marks the socket writable again, the next call could fail again if 'size >
TCP_SNDLOWAT' (because TCP_SNDLOWAT is used when marking the socket writable).
I don't know how other stacks solve this, but for us, the next call to write
would return EAGAIN again.

    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/task/?7865>

_______________________________________________
  Nachricht geschickt von/durch Savannah
  http://savannah.nongnu.org/