[lwip-devel] [bug #28064] pbuf_alloc(PBUF_POOL) is not thread-safe

[Simon Goldschmidt]

Follow-up Comment #3, bug #28064 (project lwip):

The code in question has been added on jan 28th, 2009 after a discussion on
lwip-users (without a bugtracker entry): Jonathan came up with a calculation
of how long it takes to free ooseq pbufs. 

Having that calculation in mind, the most simple solution probably is to call
tcpip_callback (non-blocking) to free the ooseq pbufs in the correct thread
context. Of course, that doesn't work when allocating from an ISR with
NO_SYS=1.

The downside is of course that we still loose some packets until the
ooseq-freeing code runs in tcpip_thread, but that's the best I can currently
think of.

Any comments on this before I make the canges?

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