From: Gregory Haskins <ghaskins@novell.com>
To: Zoltan Bus <zoltan.bus@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Problem with wake_up using real-time scheduling
Date: Thu, 02 Jul 2009 13:10:02 -0400 [thread overview]
Message-ID: <4A4CE9EA.6090807@novell.com> (raw)
In-Reply-To: <233789ed0906300144q209886b3qfb6737175a3660a0@mail.gmail.com>
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Zoltan Bus wrote:
> Hello,
>
> I have a problem on kernel 2.6.26.3. I have a real-time task which
> uses the select system call to poll my audio driver. The sleeping task
> is waken up by wake_up() from an interrupt handler.
> The problem is, that the wake_up() function sometimes does not wake
> up the task if real-time priority is used.
>
> The try_to_wake_up() returns from the out_running section, because of the check
>
> if (p->se.on_rq)
> goto out_running;
>
> There are no other tasks running when the poll function is called.
>
> Is this a known problem? Is it fixed somehow in newer versions?
> Unfortunately I do not have the possibility to change the newest kernel version.
> I am a newbie at linux, thank you very much for your help.
>
>
That *should* work fine. Can you post your code?
Regards,
-Greg
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prev parent reply other threads:[~2009-07-02 17:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-30 8:44 Problem with wake_up using real-time scheduling Zoltan Bus
2009-07-01 1:38 ` Robert Hancock
2009-07-02 17:10 ` Gregory Haskins [this message]
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