Date: Fri, 13 Jan 2006 08:12:08 -0800 (PST)
From: Davide Libenzi <davidel@xmailserver.org>
To: Howard Chu <hyc@symas.com>
cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: epoll_wait, epoll_ctl
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On Fri, 13 Jan 2006, Howard Chu wrote:

> 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? 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?

The same thing that happens when you close a file on another thread, 
nothing (besides the file being automatically removed from the set). 
Removing a file (either by close or by EPOLL_CTL_DEL) is not an event.


- Davide


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