Merged revisions 81440 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r81440 | georg.brandl | 2010-05-21 23:47:05 +0200 (Fr, 21 Mai 2010) | 1 line

  Correct info for Semaphore.acquire() semantics under OSX.
........