[issue31530] [2.7] Python 2.7 readahead feature of file objects is not thread safe

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +3661

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31530>
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