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event/SocketEvent: add comment

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This commit is contained in:
Max Kellermann 2020-12-04 09:55:01 +01:00
parent b56c0e69e4
commit cea8db7eaa
1 changed files with 3 additions and 0 deletions
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3
src/event/SocketEvent.cxx
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@ -44,6 +44,9 @@ SocketEvent::Close() noexcept
if (!fd.IsDefined()) if (!fd.IsDefined())
return; return;
/* closing the socket automatically unregisters it from epoll,
so we can omit the epoll_ctl(EPOLL_CTL_DEL) call and save
one system call */
if (std::exchange(scheduled_flags, 0) != 0) if (std::exchange(scheduled_flags, 0) != 0)
loop.AbandonFD(*this); loop.AbandonFD(*this);
fd.Close(); fd.Close();