event/SocketEvent: add comment

cea8db7e · Max Kellermann · b56c0e69 · cea8db7e
Commit cea8db7e authored Dec 04, 2020 by Max Kellermann
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SocketEvent.cxx src/event/SocketEvent.cxx +3 -0

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--- a/src/event/SocketEvent.cxx
+++ b/src/event/SocketEvent.cxx
@@ -44,6 +44,9 @@ SocketEvent::Close() noexcept
 	if (!fd.IsDefined())
 		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)
 		loop.AbandonFD(*this);
 	fd.Close();