On Mon, 2009-07-27 at 03:03 -0700, Chris_S wrote:
> Well I found the source of my TCP dying on the 3rd page refresh:
> tcp_listen()
>
> I had the lwipopts.h set to:
>
> #define TCP_LISTEN_BACKLOG 1
> #define TCP_DEFAULT_LISTEN_BACKLOG 5
>
> and the server HTTP.c module was calling "tcp_listen()"
> That caused the problem. It was a backlog issue.
>
> I set:
>
> #define TCP_LISTEN_BACKLOG 0
Sounds like you've got a workaround at least, but there should be no
problem with that code.
> and no problem with multiple page refreshes.
>
> However I then modified the server HTTP.c so it calls
>
> if (TCP_LISTEN_BACKLOG==1)
> tcp_listen_with_backlog(pcb,backlog)
> else tcp_listen(pcb)
>
> My question is, what is the "backlog" param value suppose to be?
> I set it to TCP_DEFAULT_LISTEN_BACKLOG.
That's very odd, as tcp_listen is defined to be:
#define tcp_listen(pcb) tcp_listen_with_backlog(pcb,
TCP_DEFAULT_LISTEN_BACKLOG)
so there should be no difference between the two lines in your
modification.
> So far, if I try to use the backlog function, it doesn't keep working.
> It keeps exiting at:
>
> #if TCP_LISTEN_BACKLOG
> if (pcb->accepts_pending >= pcb->backlog) {
> printf("ERROR! pcb->accepts_pending >= pcb->backlog\n");
> return ERR_ABRT;
> }
> #endif /* TCP_LISTEN_BACKLOG */
>
> in "tcp_listen_input()" in TCP_IN.H.
>
>
> Is this backlog function not working? Not working in Raw?
That suggests that there are more accepted connections pending than are
allowed by the selected backlog. i.e. you've selected a certain number
of connections to queue waiting for an accept() call, and then another
connection has arrived, and it can't queue this one, so it drops it.
Kieran
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