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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Actually such flag already exists. It is unlocked_count.

There is also similar issue with seek().

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