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Date: Fri, 21 Dec 2007 16:08:22 +0800
From: David Xu <davidxu@FreeBSD.org>
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To: Daniel Eischen <deischen@FreeBSD.org>
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Cc: freebsd-threads@FreeBSD.org
Subject: Re: threads/118910: Multithreading problem
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Daniel Eischen wrote:

> I don't think it is as big a change as you think it is.  We already
> have several layers of priorities (interrupt, time-share, idle, ?).
> All threads belong to these classes.  As long as priority inheritence
> works, there should be no problems.  The problems seem to occur when
> we try to inject artificial priorities into threads, like using
> msleep().  I think we are better off just letting threads run based
> on their own base priority and whatever their inherited priority is.
> 

For test purpose, you may try to ignore thread priority parameter
in msleep(), I didn't test this, but it does change the FreeBSD
behavior. I don't know any side effect since I am unable to test
all applications in the world, maybe you can start a project to hack
it ?

Regards,
David Xu