Wake up thread blocked on accept() call

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Close the socket using the shutdown() call. This will wake up any threads blocked on it, while keeping the file descriptor valid.

close() on a descriptor another thread B is using is inherently hazardous: another thread C may open a new file descriptor which thread B will then use instead of the closed one. dup2() a /dev/null onto it avoids that problem, but does not wake up blocked threads reliably.

Note that shutdown() only works on sockets — for other kinds of descriptors you likely need the select+pipe-to-self or cancellation approaches.

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