[issue7360] [mailbox] race: mbox may lose data with concurrent access

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Oops, sorry:
> I don't think this class aims at being safe against concurrent access,
> so having it fail loudly is a good thing.

I now understand that the problem is that it doesn't fail loudly. That's
what I get for replying too quickly.
Still, I don't think the suggested fix is ok. Perhaps we should simply
state in the documentation that flush() discards the old file, so that
other processes accessing it may get a surprise.

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