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Date:      Wed, 23 May 2001 16:05:41 -0700 (PDT)
From:      John Baldwin <jhb@FreeBSD.org>
To:        Alfred Perlstein <bright@rush.net>
Cc:        cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org
Subject:   Re: cvs commit: src/sys/kern kern_synch.c
Message-ID:  <XFMail.010523160541.jhb@FreeBSD.org>
In-Reply-To: <20010523171709.R17514@superconductor.rush.net>

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On 23-May-01 Alfred Perlstein wrote:
> * John Baldwin <jhb@FreeBSD.org> [010523 15:39] wrote:
>> jhb         2001/05/23 12:38:27 PDT
>> 
>>   Modified files:
>>     sys/kern             kern_synch.c 
>>   Log:
>>   Add in assertions to ensure that we always call msleep or mawait with
>>   either a timeout or a held mutex to detect unprotected infinite sleeps
>>   that can easily lead to deadlock.
>>   
>>   Submitted by:      alfred
> 
> I'm glad to see this assertion go in, however it's really not perfect,
> it will not detect tsleeps with a timeout without a mutex held because
> that is "valid".  I really think we need some sort of way to really
> "pause" rather than wait for a signalling.  Anyhow, we'll get to it
> one day. :)

Agreed.  cv's require a mutex, so as things move to cv's this will become less
of a problem.

-- 

John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/

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