From: Nick LeRoy <nleroy@cs.wisc.edu>
To: "Albert D. Cahalan" <acahalan@cs.uml.edu>, linux-kernel@vger.kernel.org
Cc: acahalan@cs.uml.edu
Subject: Re: Detecting threads vs processes with ps or /proc
Date: Sun, 8 Dec 2002 21:18:44 -0600 [thread overview]
Message-ID: <200212090319.gB93J7p20606@schroeder.cs.wisc.edu> (raw)
In-Reply-To: <200212090024.gB90OTN25818@saturn.cs.uml.edu>
On Sunday 08 December 2002 06:24 pm, Albert D. Cahalan wrote:
> Robert Love writes:
> > On Fri, 2002-12-06 at 14:56, Nick LeRoy wrote:
> >> I was considerring doing something like this as well. From your
> >> experience, does it work reliably?
> >
> > It never fails to detect threads (no false negatives).
>
> Testing the algorithm on idle test processes won't show
> this damn-obvious race condition:
>
> 1. you read the first thread's info
> 2. the second thread calls mmap() and/or takes a page fault
> 3. you read the second thread's info
Yeah, I thought of that, too. Probably not too likely, of course, but it
still there. Murphy rules.
Robert: Any thoughts on this?
-Nick
next prev parent reply other threads:[~2002-12-09 3:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-09 0:24 Albert D. Cahalan
2002-12-09 3:18 ` Nick LeRoy [this message]
2002-12-09 3:47 ` Robert Love
-- strict thread matches above, loose matches on Subject: below --
2002-12-06 15:24 Nick LeRoy
2002-12-06 19:48 ` Robert Love
2002-12-06 19:56 ` Nick LeRoy
2002-12-06 20:09 ` Robert Love
2002-12-09 16:27 ` Jeremy Fitzhardinge
2002-12-08 12:24 ` Gilad Ben-Yossef
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