Are list mutations thread-safe?

[Aahz Maruch]

In article <etd8zw5qfdv.fsf at w20-575-109.mit.edu>,
Alex  <cut_me_out at hotmail.com> wrote:
>
>Hi.  Can two threads get in each others' way if they simultaneously try
>to mutate a list?  How could I make a reliable test to answer a question
>like this?

It depends how they mutate it.  I believe that single builtin functions
(e.g. [].append()) are thread-safe.  OTOH, [].sort() may not be
thread-safe, particularly if you've got user-defined classes on the list
with __cmp__() defined.
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