When NodeJS I/O Blocks | The Backend Engineering Show
The Backend Engineering Show with Hussein Nasser
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Node JS Async Single Thread
Node JS is a single threaded runtime. And most of the work is done asynchronously with that single thread. In Linux, it uses E-pol. In Mac OS, it uses KQ for SunOS, it uses event ports. For Windows, it uses the I O C P which stands for input output completion ports. Regardless of the method performed after the asynchronous I O is done, node calls the user callback that are scheduled in the event main loop.
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