[lwip-users] Non-blocking socket I/O

[Muhamad Ikhwan Ismail]

Hi,

I have successfully integrated lwIP version 1.2.0 in a PowerPC microcontroller running SMX RTOS
thanks to the support I have gotten from lwIP community. I am now trying to implement non-blocking socket operation for
connect() and write(). For accept() and read() the socket is now non-blocking since I use select().
 I am aware that there is such a thread previously, however it ends with no clear result.

I am wondering why do we have to block write() from the first place?

And as for connect(), I am planing to implement the following changes:

1. in netconn_connect(), if the O_NONBLOCK flag is set, then use sys_arch_mbox_try_fetch() and return EINPROGRESS. Then set the netconn state
to NETCONN_CONNECT. Any subsequent connect checks the NETCONN_CONNECT state and returns EALREADY

2. Use the callback function to set the sendevent to plus in the do_connected().

3. Select() after connection is established will then return a non-zero nready for the writeset.
 The application then call sys_arch_mbox_tryfetch, free the message, reset the send event to zero and can now begin writing/reading to the socket.

Is there any changes or conflicts I should be aware of if i do implement these changes ?

I am thankful for any advices you guys could offer,

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