Thread: #6966.

git-svn-id: http://svn.boost.org/svn/boost/trunk@83908 b8fc166d-592f-0410-95f2-cb63ce0dd405
Thread: update history.

git-svn-id: http://svn.boost.org/svn/boost/trunk@83910 b8fc166d-592f-0410-95f2-cb63ce0dd405