Dirk Lutzebäck wrote:
Joe, do you know where I should look in the 7.4.2 code to find this out?

I think I was wrong. I just looked in CVS and found the commit I was thinking about:


Revision 1.23 / (download) - [select for diffs] , Sat Dec 27 20:58:58 2003 UTC (3 months, 2 weeks ago) by tgl
Changes since 1.22: +5 -1 lines
Diff to previous 1.22

Improve spinlock code for recent x86 processors: insert a PAUSE
instruction in the s_lock() wait loop, and use test before test-and-set
in TAS() macro to avoid unnecessary bus traffic.  Patch from Manfred
Spraul, reworked a bit by Tom.

I thought this had been committed to the 7.4 stable branch as well, but it appears not.


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