From owner-cvs-all  Tue Jun  4 14:53:59 2002
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From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 4 Jun 2002 14:53:48 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern kern_mutex.c
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jhb         2002/06/04 14:53:48 PDT

  Modified files:
    sys/kern             kern_mutex.c 
  Log:
  Optimize the adaptive mutex spin a bit.  Use a simple while loop with
  simple reads (and on IA32, a "pause" instruction for each interation of the
  loop) to spin until either the mutex owner field changes, or the lock owner
  stops executing.
  
  Suggested by:   tanimura
  Tested on:      i386
  
  Revision  Changes    Path
  1.100     +4 -1      src/sys/kern/kern_mutex.c

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