[lwip-devel] [bug #20288] event_callback is called from multiple threads without locking

[Simon Goldschmidt]

Follow-up Comment #2, bug #20288 (project lwip):

Hmm, as long as we only look at the socket layer (which is the only code
really using the callbacks inside the stack), it seems I didn't read the code
properly: it _is_ protected right now, only this is done with a semaphore in
sockets.c:event_callback().

The only thing not protected (an thus needing a change) is for data coming in
right after an accept (on the newconn). That would need protection.

Also, things can be sped up if we use SYS_ARCH_PROTECT here instead of a
semaphore, but this is true for the whole socket layer...

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