Google Gears : WorkerPool
The WorkerPool behaves like a collection of processes, rather than threads. Workers do not share any execution state. Changing a variable in one worker has no effect in any other worker. And created workers do not automatically inherit script code from their parents.
Members of a WorkerPool interact with each other only by sending message objects.
http://code.google.com/apis/gears/api_workerpool.html#workerpool_class
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