Re: [lwip-users] board hangs using dhcp

[address@hidden]

Andrea Visinoni wrote:
> Switching to lwip 1.3.2 solved the issue running the same code.
>    
You're still violating threading requirements then, and can be lucky it 
works. You might run into problems with that later because two threads 
are active in the lwIP code at the same time, which is not supported. If 
you don't want to change that, I can't make you to, I can only repeat 
myself and tell you that the code below is *not* safe!

Leaving away the calls to dhcp_fine_tmr and dhcp_coarse_tmr and only 
sleeping should work, too: the timer functions should be called by the 
tcpip_thread already.

Simon

> Il 04/03/2010 16.13, address@hidden ha scritto:
>    
> > It seems you are violating threading requirements: calling the netif_*
> > and dhcp_* functions from any other thread than the tcpip_thread is not
> > allowed! And if the code below *would* run in that thread context, it
> > would block RX-packets: the tcpip_thread must process incoming packets
> > from its mbox.
> >
> > If you are running multithreaded, you have to use tcpip_callback to get
> > into the tcpip_thread and call dhcp_start from there. Also, the timer
> > functions will get called automatically by the tcpip_thread, so there's
> > no need to call them on your own.
> >
> > Simon
> >
> >
> > Andrea Visinoni wrote:
> >      
> > > Hi,
> > > i have a simple webserver task on my custom board (at91sam7x256) using
> > > freertos and lwip 1.2.0.
> > > Using static ip i have no problems, but using dhcp my board hangs after
> > > the very first send (using socket api or netconn_write...same problem).
> > > The port is open, the connection is accepted, but when i start sending
> > > data to client in several sends, only the first one succeed.
> > >
> > > this is my dhcp start code:
> > >
> > > IP4_ADDR(&xIpAddr,0,0,0,0);
> > > IP4_ADDR(&xNetMast,0,0,0,0);
> > > IP4_ADDR(&xGateway,0,0,0,0);
> > >
> > > netif_add(&EMAC_if,&xIpAddr,&xNetMast,&xGateway, NULL,
> > > ethernetif_init, tcpip_input);
> > >
> > > // make it the default interface
> > > netif_set_default(&EMAC_if);
> > >
> > > // Avvio DHCP
> > > dhcp_start(&EMAC_if);
> > >
> > > // DHCP negotiation
> > > int mscnt = 0;
> > > while (EMAC_if.ip_addr.addr == 0)
> > > {
> > > sys_msleep(DHCP_FINE_TIMER_MSECS);
> > > dhcp_fine_tmr();
> > > mscnt += DHCP_FINE_TIMER_MSECS;
> > > if (mscnt>= DHCP_COARSE_TIMER_SECS * 1000)
> > > {
> > > dhcp_coarse_tmr();
> > > mscnt = 0;
> > > }
> > > }
> > >
> > > Any hints?
> > >
> > > Best regards
> > > Andrea
> > >
> > >
> > > _______________________________________________
> > > lwip-users mailing list
> > > address@hidden
> > > http://lists.nongnu.org/mailman/listinfo/lwip-users
> > >
> > >        
> >
> >
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> >      
>
>
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