From: Philippe Gerum <rpm@xenomai.org>
To: Jan Kiszka <kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] [BUG] scheduling order of dying shadow threads
Date: Tue, 08 Nov 2005 16:51:02 +0100 [thread overview]
Message-ID: <4370C966.3030903@domain.hid> (raw)
In-Reply-To: <4370641D.7010906@domain.hid>
Jan Kiszka wrote:
> Hi Philippe,
>
> I think this one is for you: ;)
>
> Sebastian got almost mad with his CAN driver while tracing a strange
> scheduling behaviour during shadow thread deletion for several days(!) -
> and I was right on the way to follow him yesterday evening. Attached is
> a simplified demonstration of the effect, consisting of a RTDM driver
> and both a kernel and user space application to trigger it.
>
I've spotted the issue in nucleus/shadow.c. Basically, the root thread priority
boost was leaking to a non-shadow thread due to a missing priority reset in the
lostage APC handler, whilst a shadow was in the process of relaxing. Really
funky bug, thanks! :o> Fixed in the repo hopefully for good. The scheduling
sequence is now correct with your demo app on my box.
--
Philippe.
next prev parent reply other threads:[~2005-11-08 15:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-08 8:38 [Xenomai-core] [BUG] scheduling order of dying shadow threads Jan Kiszka
2005-11-08 9:32 ` Philippe Gerum
2005-11-08 15:51 ` Philippe Gerum [this message]
2005-11-08 16:21 ` Sebastian Smolorz
2005-11-08 16:30 ` Jan Kiszka
2005-11-08 17:47 ` Philippe Gerum
2005-11-14 12:45 ` [Xenomai-core] [BUG] rt_pipe_flush declaration missing in skins/native/pipe.h Ignacio García Pérez
2005-11-14 15:02 ` Philippe Gerum
2005-11-14 16:08 ` Ignacio García Pérez
2005-11-14 16:20 ` Philippe Gerum
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