[issue16742] PyOS_Readline drops GIL and calls PyOS_StdioReadline, which isn't thread safe

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


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dependencies: +API for setting the memory allocator used by Python

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16742>
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