Re: [lwip-users] Freeing all pbufs on tcp_abort()

[address@hidden]

JM wrote:
> What is the proper way to close a connection and free all resources, 
> namely pbufs, associated with it?  In my application, I have to use 
> tcp_abort to end the connection.  (I do indeed have to send a RST; 
> Winamp does the same thing with streaming audio and I'm emulating that). 
>
> I can connect to to a host and receive data fine, but when I end that 
> connection and initiate a different connection, my debug output 
> occasionally indicates I'm out of MEMP_POOL.
"Out of MEMP_POOL" can mean anything. You need to know exactly which 
pool and see if it is really the pbufs you are running out of. But I'd 
rather guess it's the tcp_pcb-pool: aborted pcbs are put on the 
time-wait list. If you then open a new connection, you will eventually 
run out of tcp_pcbs. However, that's not a fatal warning as the tcp code 
then frees the oldest pcb in time-wait and uses it. You should check the 
stats (or use the prin_stats function) to see which memp pool was emtpy.

Simon