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Drats, forgot about the did_something/goto thing.

This makes the lock it a bit more unlikely, but still possible.
(by the way, you DID set did_something = 0 after again:, didn't you?)

What happens when
did_something = 1, goto again, just passed the a = shared_memory->a; line
send()

Another handle_event is run (after all, send_event() is run)? If so, you might
have a race condition in which the first writes new_b = b + 1, then the first
one goes new_b = b and you're out of sync again.
Is it ignored? then b falls behind a again.



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