Re: [lwip-users] Multi-Threaded netconn API TCP application

[Darius Babrauskas]

Hi Mihai,

 

It looks that you have problems with systimeouts. Each tread must have self systimeout stuct.

 

create_thread("client", client, (void *)&session_index);

 

 

 

//PS: The application runs on Linux atm, using lwip 1.4.0 (last stable one), the unix port from contrib directory and the clients connect using netcat <ip> <port>.

If you using Linux, why you use LWIP?  Are you want testing? 

It seem to me, that linux port not very good implemented. Maybe for simple testing. 

 

Darius

 

 

From: Pîrvu Mihai

Sent: Sunday, September 20, 2015 2:05 PM

To: address@hidden

Subject: [lwip-users] Multi-Threaded netconn API TCP application

 

Hello guys, I'm sorry if this was posted before, but i couldn't find an answer, so I'm gonna post here in search of one.

 

I want to create a simple multi-threaded TCP server, that handled each new connection on a separate thread. The listener thread will listen on the "main" thread, and every connection will create a new thread, that will communicate with the session created.

 

The code I wrote is here: http://pastebin.com/zUuTtfL0

 

I have dug a little into the lwip API to see how netconn_accept works and I saw that it blocks until the "not_empty" semaphore frm the "acceptbox" mailbox has something in it.

 

Now, every time this happens, I create a new thread and the session creation is done there, and I block the main thread using the "semaphore" variable, so a new connection doesn't happen while I still proces the old one.

 

Now, the problem is pretty much this:

- I connect the first client, it works just fine

- When ANY second client tries to join, it automatically gets disconnected and the server's console prints: Disconnected: 1, so netconn_recv doesn't return ERR_OK.

 

So my question is:

- How can I create this multi-threaded enviroment so each client is processed in a different thread?

- Also, what am I doing wrong in my current setup ?

 

PS: The application runs on Linux atm, using lwip 1.4.0 (last stable one), the unix port from contrib directory and the clients connect using netcat <ip> <port>.

 

Mihai

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