From: Sebastian Smolorz <smolorz@domain.hid>
To: Johan Borkhuis <j.borkhuis@domain.hid>
Cc: Xenomai help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] Problem with semaphores in an RTDM driver
Date: Wed, 28 May 2008 11:03:42 +0200 [thread overview]
Message-ID: <483D1FEE.7050203@domain.hid> (raw)
In-Reply-To: <483D1D9A.7010209@domain.hid>
Johan Borkhuis wrote:
> I am trying to use semaphores inside my driver. It is a driver that can
> be used as standard Linux driver and RTDM driver.
>
> However, when I use rt_sem_p or rtdm_sem_timeddown in my read_nrt
> function I get a -1 return value, indicating EPERM.
Your read_nrt function is only for non real-time tasks. So if you use a
call to a service which requires primary execution mode of Xenomai it
consequentially fails.
> When I look at the
> thread state I see a value of 0x00400080, which indicates a standard
> Linux thread. The rtdm-context is 0x00000001.
> The userspace thread has a thread state of 00300380.
>
> What am I doing wrong here? How can I get a semaphore or other sync
> mechanism to work inside my RTDM driver?
Use RTDM services inside the *_rt functions and plain Linux services
inside the *_nrt functions of your driver.
--
Sebastian
next prev parent reply other threads:[~2008-05-28 9:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-28 8:53 [Xenomai-help] Problem with semaphores in an RTDM driver Johan Borkhuis
2008-05-28 9:03 ` Sebastian Smolorz [this message]
2008-05-28 9:10 ` Jan Kiszka
2008-05-28 12:16 ` Johan Borkhuis
2008-05-28 12:30 ` Jan Kiszka
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