From owner-cvs-all  Fri Jun  7  9:55:18 2002
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Date: Fri, 07 Jun 2002 10:54:17 -0600 (MDT)
Message-Id: <20020607.105417.122245999.imp@village.org>
To: jhb@FreeBSD.org
Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org,
	dwmalone@maths.tcd.ie
Subject: Re: cvs commit: src/sys/kern kern_sig.c
From: "M. Warner Losh" <imp@village.org>
In-Reply-To: <XFMail.20020607123811.jhb@FreeBSD.org>
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In message: <XFMail.20020607123811.jhb@FreeBSD.org>
            John Baldwin <jhb@FreeBSD.org> writes:
: 
: On 07-Jun-2002 M. Warner Losh wrote:
: > In message: <XFMail.20020607091038.jhb@FreeBSD.org>
: >             John Baldwin <jhb@FreeBSD.org> writes:
: >: You mean the SIGXCPU that is commented out in mi_switch()?  It will
: >: be turned back on when I or someone else figures out how to do it
: >: safely. :)
: > 
: > I thought that was commented out due to a bug where time would go
: > backwards every so often, causing there to be 2^32 or so time to be
: > charged to the process, which put it over the limit.
: 
: It's commented out because of locking problems.  mi_switch() is often
: called with p_stat set to something else like SSLEEP or what not.  If
: we block on the proc lock to do the psignal, then when we finally get
: the lock p_stat will be SRUN.  We might be able to do the check at the
: very end of mi_switch() though.

OK.  I was getting confused between this bug and an older, timecounter
bug from 2.2.x

Warner

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