Re: [lwip-users] LPC1768/9 LAN8720 FreeRTOS 7.4 LWIP 1.4.1

[Sylvain Rochet]

Hi,


On Fri, May 24, 2013 at 07:35:49AM +0200, Furiantes Furiantes wrote:
> Is tcp_new() thread safe too ? or just netcon. My scenario is that:

No, as said in doc/rawapi.txt :-)


Raw API is *NOT* thread safe: udp_*(), tcp_*(), netif_*(), ...

Netconn API is thread safe: netconn_*()
Socket API is thread safe: lwip_accept(), lwip_bind(), lwip_connect(), ...
NetifAPI is thread safe: netifapi_*()


> - i will call a TCP staff only in seperated threads. Like do_download =
> tcp_new() in one thread and than like listen to some port initialized in
> seperated thread etc. etc.
> 
> Is that ok to do or not ? With global access can I access from TCP_1 thread
> to TCP_2 thread like TCP_2 kill TCP_1 thread.

Nah, this is wrong, you *have to* use netconn or socket API.


Also, and this is very important too, Netconn and Socket API are thread 
safe against lwIP thread but NOT against themselves, so a UDP or a TCP 
PCB must be handled by only one thread. If you want to share a PCB 
between threads you can of course add the necessary mutex around Netconn 
or Socket calls.


Sylvain

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