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Remove redundant epollWaitNow() call in EpollEventLoop#closeAll() (#9614
) Motivation This is a vestige that was removed in the original PR #9535 before it was reverted, but we missed it when re-applying in #9586. It means there is a possible race condition because a wakeup event could be missed while shutting down, but the consequences aren't serious since there's a 1 second safeguard timeout when waiting for it. Modification Remove call to epollWaitNow() in EpollEventLoop#closeAll() Result Cleanup redundant code, avoid shutdown delay race condition
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