From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Andrey Nechypurenko <andreynech@googlemail.com>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] Qeustion about rtdm_event_timedwait
Date: Mon, 01 Oct 2012 18:05:19 +0200 [thread overview]
Message-ID: <5069BF3F.1010900@xenomai.org> (raw)
In-Reply-To: <CAOiXNkAWhi2-ZMJUx53-Lfh9EG7RP52QX5RK9KBnhjw0w6qKow@mail.gmail.com>
On 10/01/2012 06:01 PM, Andrey Nechypurenko wrote:
>> On 10/01/2012 05:51 PM, Andrey Nechypurenko wrote:
>>> driver's read() function is registered as *read_nrt*
>>
>> That is the problem.
>
> Thank you Gilles!
>
If you want to wake up a regular thread, you should signal an
rtdm_nrtsig in the interrupt handler, and the nrtsig handler wakes up
the linux thread using regular linux services such as wake_up(). But in
that case, of course, do not expect low latencies for this thread.
Also note that rtdm_event_wait works like a semaphore, not like a
condition variable: it has a counter, rtdm_event_wait will return
immediately as many times as rtdm_event_signal was called.
--
Gilles.
next prev parent reply other threads:[~2012-10-01 16:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-01 15:51 [Xenomai] Qeustion about rtdm_event_timedwait Andrey Nechypurenko
2012-10-01 15:57 ` Gilles Chanteperdrix
2012-10-01 16:01 ` Andrey Nechypurenko
2012-10-01 16:05 ` Gilles Chanteperdrix [this message]
2012-10-01 16:10 ` Andrey Nechypurenko
2012-10-01 16:13 ` Andrey Nechypurenko
2012-10-01 16:20 ` Gilles Chanteperdrix
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