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SubjectRe: kqueue microbenchmark results
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> the application of a close event.  What can I say, "the fd formerly known
> as X" is now gone? It would be incorrect to say that "fd X was closed",
> since X no longer refers to anything, and the application may have reused
> that fd for another file.

Which is precisely why you need to know where in the chain of events this
happened. Otherwise if I see

'read on fd 5'
'read on fd 5'

How do I know which read is for which fd in the multithreaded case

> As for the multi-thread case, this would be a bug; if one thread closes
> the descriptor, the other thread is going to get an EBADF when it goes
> to perform the read.

Another thread may already have reused the fd

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