From: "David Schwartz" <davids@webmaster.com>
To: "linux-kernel" <linux-kernel@vger.kernel.org>
Subject: RE: epoll_wait, epoll_ctl
Date: Fri, 13 Jan 2006 14:51:10 -0800
Message-ID: <MDEHLPKNGKAHNMBLJOLKIEPAJFAB.davids@webmaster.com>
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> So, what's supposed to happen in a threaded program where one thread
> does an epoll_ctl on an epoll fd while another thread is currently
> waiting in epoll_wait on the same fd?

	Nothing special.

> In particular, what happens if a
> thread does an EPOLL_CTL_DEL on one of the fds that is currently being
> waited on? Is there a possibility of an event being returned on the fd
> even after the EPOLL_CTL_DEL completes?

	Absolutely. The EPOLL_CTL_DEL might not even start until after the event
has been determined to be returned and the wait is in the process of
returning.

	DS


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