[issue3476] BufferedWriter not thread-safe

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> Well, if that resolution is prefered, I think it should be integrated to
> the builtin print function, rather than forcing users to monkeypatch it
> (but a debugging facility directly calling sys.stdout.write or
> equivalent will not be helped).

True. I think it is the stream's write method that must be
synchronized, e.g. by renaming the current write function to
_write_locked, and adding a write function that obtains a per-file
lock, and calls write_locked. Other methods accessing the buffer
need to get synchronized with the same lock as well.

This is how it's done in about any stdio implementation I ever looked at.

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<http://bugs.python.org/issue3476>
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