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The function that is executed on the blocking thread can still add events back to the event queue to be processed. For example a database query call is typically passed a callback function that will parse the results and my schedule additional work on the event queue before sending a response.

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Cover of Node.js, MongoDB, and AngularJS Web Development

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https://www.safaribooksonline.com/library/view/nodejs-mongodb-and/9780133844351/ch04.html