From: Ingo van Lil <inguin@gmx.de>
To: Stanislav Meduna <stano@meduna.org>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Multi-threaded applications and floating point registers
Date: Tue, 07 Apr 2009 23:23:22 +0200 [thread overview]
Message-ID: <49DBC44A.5070700@gmx.de> (raw)
In-Reply-To: <49DB9B13.80203@meduna.org>
Stanislav Meduna wrote:
>> I'm experiencing some weird problems with a multi-threaded application
>> I'm working on: A function which uses nothing but a single input value,
>> a few constants and a couple of floating point operations returns wrong
>> results from time to time. The application uses multiple threads, and
>> we're suspecting that the FPU state isn't properly saved and restored
>> when switching between threads within a process.
>
> I had a similar problem between processes a few months ago,
> I also posted an example, unfortunately with no resolution
> nor further inquiries from the developers. I suspect the skas3
> patch does not get much attention now...
Yes, I remember the thread. I don't think we're hitting the same
problem, though: I'm not using the SKAS3 patch, and I did not notice any
kind of cross-process influence. The effect is limited to threads
sharing a single process context.
Regards,
Ingo
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prev parent reply other threads:[~2009-04-07 21:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-07 17:47 [uml-devel] Multi-threaded applications and floating point registers Ingo van Lil
2009-04-07 18:27 ` Stanislav Meduna
2009-04-07 21:23 ` Ingo van Lil [this message]
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