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Date: Sun, 19 Aug 2001 02:53:40 -0500 (CDT)
From: rmtodd@servalan.servalan.com (Richard Todd)
To: current@freebsd.org
Subject: Re: Sound broken on -current again...
Newsgroups: servalan.mailinglist.fbsd-current
References: <servalan.mailinglist.fbsd-current/20010818211040.C31058@over-yonder.net> <servalan.mailinglist.fbsd-current/200108190843.IAA36455@www.abc.com.ua>
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In servalan.mailinglist.fbsd-current Maxim Sobolev writes:
>I found that after reverting the following deltas (jhb's 10 August commit)
>sound starts working again:

[list of deltas deleted]

I found much the same thing; specifically, the problematic change is this one:


jhb         2001/08/10 14:08:57 PDT

  Modified files:
    sys/kern             kern_synch.c 
  Log:
  Work around a race between msleep() and endtsleep() where it was possible
  for endtsleep() to be executing when msleep() resumed, for endtsleep()
  to spin on sched_lock long enough for the other process to loop on
  msleep() and sleep again resulting in endtsleep() waking up the "wrong"
  msleep.
  
  Obtained from:        BSD/OS
  
  Revision  Changes    Path
  1.154     +24 -4     src/sys/kern/kern_synch.c


Kernels built from source immediately prior to this change work; kernels 
built from source immediately after this change have the sound-related problems
mentioned in this thread. 

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