Added shutdown event-fd acting as a kill switch actionable from
outside the micro-http server.
Needed to be able to break out of the inner epoll_wait on demand.
This can be used to signal the micro-http server running on a
dedicated thread that it needs to shut down.
Co-authored-by: acatangiu <adrian.catangiu@gmail.com>
Signed-off-by: Egor Lazarchuk <yegorlz@amazon.co.uk>
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