K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2014-11-15T01:18:49.262837Z
K 7
svn:log
V 228
Convert the callouts back to using mutexes.

I did this wrong - I should've included a state flag for each callout
to see if it was supposed to run or not.  I didn't do that.
Instead, just use mutexes anyway.

Suggested by: jhb

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