From: "David Schwartz" <davids@webmaster.com>
To: <linux-kernel@vger.kernel.org>
Subject: RE: PROBLEM: close(fd) doesn't wake up read(fd) or select() in another thread
Date: Sat, 15 Jul 2006 23:44:50 -0700 [thread overview]
Message-ID: <MDEHLPKNGKAHNMBLJOLKEEFDNDAB.davids@webmaster.com> (raw)
In-Reply-To: <200607141146.52908.mikell@optonline.net>
> [1.] One line summary of the problem:
> close(fd) doesn't wake up read(fd) or select() in another thread
If you delete a resource in one thread while another thread is using it,
anything can happen. This is as serious a bug as calling 'free' on a block
of memory while another thread is using it.
You can never be sure the other thread was in 'read' or 'select' (as
opposed to being about to call it and then being pre-empted), so such code
will always have race conditions.
DS
prev parent reply other threads:[~2006-07-16 6:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-14 15:46 Michael Lindner
2006-07-14 19:07 ` Michael Lindner
2006-07-14 19:51 ` Alistair John Strachan
2006-07-16 6:44 ` David Schwartz [this message]
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