wiredtiger/wiredtiger — pull request #723 by keithbostic (2013-10-16 15:05:35+00:00)
Title: Switch the update serialization function to an atomic instruction instead of acquiring/releasing a spinlock.

@michaelcahill: Is it safe to not acquire the serialization mutex when looking for obsolete WT_UPDATE entries, if we switch to an atomic instruction as our update mechanism?