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

[Simon Goldschmidt]

Follow-up Comment #5, task #7865 (project lwip):

Being one of the supporters of a 'new' (redesigned) sockets implementation,
I'd implement this only half: return EAGAIN (or wouldblock or whatever) if
tcp_write() returns != ERR_OK but not the part waking up an application task
from select() when memory comes available.

I think that should be good enough: the 'proper' solution would be too big
for lwIP, and anyway, we would have to either try periodically or monitor the
memp pools or the heap to know when memory is available...

If we do it like that, the solution for this is a simple code change in
api_msg.c:do_writemore() (for RAW or UDP, the stack doesn't wait, anyway),
only a flag forwarding for MSG_DONWAIT or O_NONBLOCK from socket to netconn.

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