Re: [lwip-users] How to close tcp_thread

[tes_wzm]

Hi Yoav

Thank your warmheart. Your solution is perfect than mine. In my opinion, the
app tasks should be noticed to clearup sock before we want to kill tcpip
task. Otherwise, app tasks will block at send or rcv data from sock.


Yoav Nissim wrote:
> 
> Hi tes_wzm (...?)
> I am using lwIP 3.0 at the moment and had to shut it down as well.
> My solution may not be perfect, but at least it works without any thread
> killing...
> 
> 1. I added a TCPIP_MSG_TERMINATE tcpip_msg_type to the enumeration
> 
> 2. I added a case to the tcpip_thread switch:
> 
>     while(1) {    /* Main Loop */
>     ...
>     ...
>     case TCPIP_MSG_TERMINATE:
>       LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Terminating\n"));
>       sys_sem_signal(*(msg->sem));
>       return;
>     }
> 
> 3. I added the tcpip_terminate() function to tcpip.c
> 
> void
> tcpip_terminate(void)
> {
>   struct tcpip_msg msg;
>   sys_sem_t sem;
> 
>   /* If there is no tcpip mailbox, leave */
>   if (mbox == SYS_MBOX_NULL)
>       return;
> 
>   /* Create semaphore for message */
>   sem = sys_sem_new(0);
>   /* TODO: how should we handle failure here? */
>   LWIP_ASSERT("tcpip_terminate: failed to create semaphore\n",
>       sem != SYS_SEM_NULL);
> 
>   /* TODO: do we need to stop the timers? if so, how? */
> 
>   /* Tell tcpip thread to exit, and wait */
>   msg.sem = &sem;
>   msg.type = TCPIP_MSG_TERMINATE;
>   sys_mbox_post(mbox, &msg);
>   sys_arch_sem_wait(sem, 0);
> 
>   /* clean up tcpip thread resources */
>   sys_mbox_free(mbox);
>   sys_sem_free(sem);
>   mbox = SYS_MBOX_NULL;
> 
>   /* clean up all initialized lwip components */
>   lwip_cleanup();
> }
> 
> 
> 4. Before calling tcpip_terminate(), you had better make sure you clean
> up all PPP sessions, interfaces, and anything else you've initialized
> via the tcpip based APIs.
> 
> 5. The lwip_cleanup() at the end of the function is not a part of lwIP.
> I've added it in init.c as a reciprocal for lwip_init(). It basically
> needs to clean up any resources that lwip_init() allocates, but I did
> not get to do that part yet (nor even check if its necessary).
> 
> 
> HTH,
> Yoav.
> 
> 
> 
> 
> 
> On 29/03/10 10:36 AM, tes_wzm wrote:
>> I use lwip+ppp to send data to my tcp server. When sth occured, I want
>> to close tcp thread. How can I do it? If I kill this thread through
>> OS, it will leak some memory which use to create mailbox and sem. Is't
>> some routes to release this memory?
>> View this message in context: How to close tcp_thread
>> <http://old.nabble.com/How-to-close-tcp_thread-tp28065857p28065857.html>
>> Sent from the lwip-users mailing list archive
>> <http://old.nabble.com/lwip-users-f7923.html> at Nabble.com.
>>
>>
>> _______________________________________________
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> 
> -- 
> Yoav Nissim
> Software Engineer, Software Tools Division
> Jungo Software Technologies
> Email: address@hidden
> Web: http://www.jungo.com
> Phone: +972-74-7212138
> Fax: +972-74-7212122
> Mobile: +972-54-2271315
> 
> 
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> 

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