Expand on race-condition avoidance in locks; explain change caching better.
Expand on race-condition avoidance in locks; explain change caching
better.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion