[issue9657] Add circular imports test

[Antoine Pitrou]

New submission from Antoine Pitrou <pitrou at free.fr>:

Here is a test for multi-threaded circular imports (in order to exercise the import lock), following a comment by Graham Dumpleton on #9260.

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components: Tests
files: circulartest.patch
keywords: patch
messages: 114541
nosy: brett.cannon, ncoghlan, pitrou
priority: normal
severity: normal
stage: patch review
status: open
title: Add circular imports test
type: behavior
versions: Python 3.2
Added file: http://bugs.python.org/file18600/circulartest.patch

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