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I have solved this problem caused by a Makefile bug in ./stubdom, after executing make crossclean , I found the .o files still existed in lwip-x86_64 folder. So I add a command find . -name "*.o" | xargs rm -f in Makefile and then anything is OK.

The reason is that lwip configure is given by the macro definition, macro definition have been replaced at the pre-compilation stage, so if I modify the lwip configure and did not delete the .o files, there is no effect. Following is the macro definitions I have modified in opt.h.

MEMP_NUM_TCP_PCB 100
MEMP_NUM_TCP_PCB_LISTEN 100
MEMP_NUM_NETCONN 100

Now the server can break through the connection limitations and more than 3 active TCP connections can be established, but sad that we have encountered another problem, the server side only can receive 61 clients of the connection requests. If exceeding the clients number, server side error will be reported as follows:

ASSERTION FAILED: mbox->reader != mbox->writer at lwip-arch.c:124.
Do_exit called!
base is 0x29fe78 caller is 0x4d49d
base is 0x29fe98 caller is 0x5a05a
base is 0x29fec8 caller is 0x5a153
base is 0x29fef8 caller is 0x634a1
base is 0x29ff28 caller is 0x65074
base is 0x29ff78 caller is 0x5d0dd
base is 0x29ffc8 caller is 0x59822
base is 0x29ffe8 caller is 0x33da

How can I solve the above problem?

On Sun, Aug 30, 2015 at 8:00 PM, <minios-devel-request@xxxxxxxxxxxxxxxxxxxx> wrote:

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Today's Topics:

Â Â1. Can't get more than 3 active TCP connections inÂ ÂMini-OS? (???)

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Message: 1
Date: Sun, 30 Aug 2015 15:17:43 +0800
From: ??? <chengfeizh@xxxxxxxxx>
To: minios-devel@xxxxxxxxxxxxxxxxxxxx
Subject: [Minios-devel] Can't get more than 3 active TCP connections
Â Â Â Â inÂ Â Â Mini-OS?
Message-ID:
Â Â Â Â <CAE4PDwSeoNzN1grV6DgSWCj8GTYA=s=zAyi2srXAPcAfA_UNgw@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"

Hello,

Â Â Â Â I'm writing an TCP server in *Mini-OS*, it can connect to multiple
TCP clients. I wrote a simple code for handling multiple TCP clients , but
there is an issue with the code. The issue is I can't get the server to
connect more than three active connections. The 4th or more clients could
not connect for unknown reasons. I looked around the forums and tried
increasing the number limit for MEMP_NUM_TCP_PCB in opt.h (
*stubdom\lwip-x86_64\include\lwip\opt.h*) and it didn't help either.

Â Â Â Â I'm running a TCP client on *Ubuntu*. Based on what I saw, the 4th
client did seem connected, but an exception was thrown during the "write"
function: "Resolver Error 0 (no error)"

Â Â Â Â How can I solve this problem?
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End of Minios-devel Digest, Vol 3, Issue 11
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Re: [Minios-devel] Minios-devel Digest, Vol 3, Issue 11