netdev - Re: Fw: [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect for sockets in accept(3)

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Message-ID: <1445445155.22974.64.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 21 Oct 2015 09:32:35 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alan Burlison <Alan.Burlison@...cle.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Stephen Hemminger <stephen@...workplumber.org>,
	netdev@...r.kernel.org, dholland-tech@...bsd.org,
	Casper Dik <casper.dik@...cle.com>
Subject: Re: Fw: [Bug 106241] New: shutdown(3)/close(3) behaviour is
 incorrect for sockets in accept(3)

On Wed, 2015-10-21 at 15:38 +0100, Alan Burlison wrote:

> ----------
> Since at least Solaris 7 (1998), a thread which is sleeping
> on a file descriptor which is being closed by another thread,
> will be woken up.
> 
> To this end each thread keeps a list of file descriptors
> in use by the current active system call.

Ouch.

> 
> When a file descriptor is closed and this file descriptor
> is marked as being in use by other threads, the kernel
> will search all threads to see which have this file descriptor
> listed as in use. For each such thread, the kernel tells
> the thread that its active fds list is now stale and, if
> possible, makes the thread run.
> 

This is what I feared.



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