PERFORCE change 65074 for review

[David Xu]

Brian Fundakowski Feldman wrote:

>On Sun, Nov 14, 2004 at 05:13:24AM +0000, David Xu wrote:
>  
>
>>http://perforce.freebsd.org/chv.cgi?CH=65074
>>
>>Change 65074 by davidxu at davidxu_alona on 2004/11/14 05:12:40
>>
>>	1. Fix a race between signal and umtx_unlock. a waiter
>>	   may be resumed by signal and left or exited, heavily
>>	   loaded test causes kernel to crash.
>>	2. Use distributed queue locks instead of single giant
>>	   lock.
>>    
>>
>
>This sounds like it could be why recently valgrind has grown broken,
>and is now entirely non-working and someimes crashes the system?
>
>  
>
Both have bug, valgrind seems have lock leak, umtx code
has race condition.

David Xu