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From: Philippe Gerum <rpm@xenomai.org>
To: Maksym Veremeyenko <verem@domain.hid>
Cc: Xenomai-help@domain.hid, Jan Kiszka <jan.kiszka@domain.hid>
Subject: Re: [Xenomai-help] Strange deadlock.
Date: Sun, 11 Feb 2007 20:05:20 +0100	[thread overview]
Message-ID: <1171220721.5035.2.camel@domain.hid> (raw)
In-Reply-To: <45CF604F.4030706@domain.hid>

On Sun, 2007-02-11 at 20:28 +0200, Maksym Veremeyenko wrote:
> Jan Kiszka пишет:
> 
> > You are holding the mutex across the serial transaction, i.e. a
> > secondary mode switch, right? If you haven't set
> > CONFIG_XENO_OPT_RPIDISABLE, you might be are affected by the bug in the
> > priority coupling between Xenomai and the Linux kernel. Already tried
> > latest v2.3.x SVN?
> i tried with r2170 and rewrited code for RT serial - situation the same.
> 
> Solution for me is to change tasks priority - set lower priority to task 
> that perform read/write serial driver operations under lock.
> 
> Perhaps i should rewrite code to exclude I/O operations under locked 
> mutex at all.
> 

In any case, possibly sleeping while holding a mutex and moreover in the
Linux context is not recommended, to say the least. This said, could you
try just replacing your mutex with a simple counting semaphore (RT_SEM)
and report the outcome? This would give us mome hints about what could
be involved in the issue. TIA,

> 
-- 
Philippe.




      reply	other threads:[~2007-02-11 19:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-09 19:35 [Xenomai-help] Strange deadlock Maksym Veremeyenko
2007-02-09 20:54 ` Philippe Gerum
2007-02-09 21:39   ` Maksym Veremeyenko
2007-02-09 21:14 ` Dmitry Adamushko
2007-02-09 22:10   ` Maksym Veremeyenko
2007-02-09 23:53     ` Dmitry Adamushko
2007-02-10  4:07 ` Maksym Veremeyenko
2007-02-10 10:34   ` Jan Kiszka
2007-02-11 18:28     ` Maksym Veremeyenko
2007-02-11 19:05       ` Philippe Gerum [this message]

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