I completely agree with BrowserUk. A much simpler approach can be used, and the one he proposes sounds good (not that he needs me to say that).
just a couple more notes, if by "multiple queries", you mean multiple actions on the same server, just pass yourself in an array of the actions you need to perform as part of the queue.
on that note, to even further simplify, you could actually get away with avoiding all mutex's, locks, etc, by setting up an output queue, and pushing all the results into it thus only the scripts main portion (thread 0) is accessing the file.
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