[lwip-devel] [task #6683] Document lwIPs thread safety requirements

[Frédéric Bernon]

Follow-up Comment #2, task #6683 (project lwip):

Some others informations to remember: some special functions can also cause
problem with multithread: netif_xxx and dhcp_xxx. These functions used same
variables than tcpip_thread. Some cases: 

- if an "application" thread remove an netif from list, during tcpip_thread
is running, so, you can get a crash. Adding two netif in the same time can
cause to lost one of interface (https://savannah.nongnu.org/bugs/?19347).

- if an "application" thread stop dhcp on an interface, because the netif's
dhcp field can be used by dhcp's timers (runnning in tcpip_thread context),
you can get a crash (https://savannah.nongnu.org/patch/?5798).




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