Merged revisions 75958 via svnmerge from

Merged revisions 75958 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r75958 | antoine.pitrou | 2009-10-30 18:07:08 +0100 (ven., 30 oct. 2009) | 7 lines

  Issue #7222: Make thread "reaping" more reliable so that reference
  leak-chasing test runs give sensible results. The previous method of
  reaping threads could return successfully while some Thread objects were
  still referenced. This also introduces a new private function:
  :func:\14hread._count().
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