parallel\Events::poll
(0.9.0)
parallel\Events::poll — Polling
返回值
Should there be no targets remaining, null
shall be returned
Should this be a non-blocking loop, and blocking would occur, null
shall be returned
Otherwise, the parallel\Events\Event returned describes the event.
Exceptions
警告
Shall throw parallel\Events\Error\Timeout if timeout is used and reached.
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