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Full-Name: Antoine Beaupre
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From: Antoine Beaupre <beaupran@IRO.UMontreal.CA>
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Date: Mon, 7 Feb 2000 13:31:24 -0500 (EST)
To: Alfred Perlstein <bright@wintelcom.net>
Cc: Freebsd Questions Mailing list <freebsd-questions@FreeBSD.ORG>
Subject: Re: PThreads
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Thanks a lot.. I knew there was something I was missing and I was a
little tired. :)

Sorry for the noise..

The AnarCat

--- Big Brother told Alfred Perlstein to write, at 10:14 of February 7:
> * Spidey <beaupran@iro.umontreal.ca> [000206 21:43] wrote:
> Content-Description: message body text
> > Hi!
> > 
> > I am currently working on a program that needs pthreads.
> > 
> > Is there some bugs in FBSD implementation of the pthreads? Because I'm
> > having serious problems here:
> 
> no there is no bug.
> 
> > The following code, when executed, gives me something really weird:
> 
> [snip...]
> 
> > Is there something I do not understand in pthreads or what???
> 
> yes, you can't possibly expect readdir() which returns a pointer
> to a _static_ structure to be thread safe the way you are using
> it.
> 
> if you wanted to fix this, then I would strdup() the d_name in the main
> thread then pass it to the slave threads, (don't forget to free() it!)
> 
> basically, you're relying on a race condition that the string in the
> dirent isn't over written by successive calls to readdir(), basically
> that your slave thread will run to completion before the main thread
> loops again doing a readdir() and clobbering your dirent.
> 
> enjoy,
> -Alfred

-- 
Si l'image donne l'illusion de savoir
C'est que l'adage pretend que pour croire,
L'important ne serait que de voir

Lofofora


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