[issue3735] allow multiple threads to efficiently send the same requests to a processing.Pool without incurring duplicate processing

[Benjamin Peterson]

Changes by Benjamin Peterson <musiccomposition at gmail.com>:


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versions: +Python 2.7, Python 3.1 -Python 2.6, Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3735>
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