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

[Simon Goldschmidt]

Follow-up Comment #12, task #6683 (project lwip):

>An interrupt routine could put pbufs in some form of queue (not necessarily
an lwip pbuf queue) and the main loop could pass them into lwip.

That's right. And that queue _could_ be a pbuf queue (or somehow else a queue
containing pbufs), so protecting pbuf.c _is_ needed in that case, I think (if
the driver wants to allocate pbufs from interrupt context).

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