eio_poll
Can be to be called whenever there are pending requests that need finishing
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inteio_poll
eio_poll can be used to implement special event loop.
For this eio_nreqs could be used to test if there are
unprocessed requests.
Applicable only when implementing userspace event loop.
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If any request invocation returns a non-zero value, returns that value.
Otherwise, it returns 0.
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eio_poll example
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eio_nreqs