Merged revisions 74582 via svnmerge from

Merged revisions 74582 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r74582 | amaury.forgeotdarc | 2009-08-30 01:00:38 +0200 (dim., 30 août 2009) | 10 lines

  Merged revisions 74581 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r74581 | amaury.forgeotdarc | 2009-08-29 20:14:40 +0200 (sam., 29 août 2009) | 3 lines

    #6750: TextIOWrapped could duplicate output when several threads write to it.
    this affect text files opened with io.open(), and the print() function of py3k
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