Merged revisions 64601 via svnmerge from

Merged revisions 64601 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r64601 | amaury.forgeotdarc | 2008-06-30 17:42:40 -0500 (Mon, 30 Jun 2008) | 11 lines

  #Issue3088 in-progress: Race condition with instances of classes derived from threading.local:

  When a thread touches such an object for the first time, a new thread-local __dict__ is created,
  and the __init__ method is run.
  But a thread switch can occur here; if the other thread touches the same object, it installs another
  __dict__; when the first thread resumes, it updates the dictionary of the second...

  This is the deep cause of the failures in test_multiprocessing involving "managers" objects.

  Also a 2.5 backport candidate.
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