[issue3139] bytearrays are not thread safe

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Ok for s#. 
But t# uses bf_getcharbuffer(), which does not seem to lock anything.
I wonder if this can lead to the same kind of problems, for example when
calling file_write with a binary file.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3139>
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