linux-kernel - Re: [patch 7/8] fdmap v2

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Message-ID: <20070610161616.301b9680@the-village.bc.nu>
Date:	Sun, 10 Jun 2007 16:16:16 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@....linux.org.uk>,
	Kyle Moffett <mrmacman_g4@....com>,
	Ulrich Drepper <drepper@...hat.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Theodore Tso <tytso@....edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

> > and there's absolutely nothing wrong with this kind of setup, even if you 
> > could obviously have done it other ways too (ie by using "dup2()" instead 
> > of "close + open"),
> > 
> 
> This kind of setup was OK 25 years ago, before multithreading era.
> You cannot reasonably expect it to work in a multithreaded program.

Why not.

When execution begins which is the normal point you do this then you've
got one thread. If you need to do this from a thread after that point
posix provides threaded applications with locking.

Not much else works in a threaded app if you get the locking wrong, and
that is considered the authors job. Why is fd allocation different ?
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