Event loop

  • What the heck is the event loop anyway? | Philip Roberts | JSConf EU https://youtu.be/8aGhZQkoFbQ

  • Node.JS contains a "dispatcher." It accepts web requests and hands them off for asynchronous processing. That dispatcher is single threaded. But the dispatcher spins up a new thread for each task, and quickly hands off the task to the new thread, freeing the dispatcher's thread for servicing a new request.

To the extent that those task threads are kept separate (i.e. they don't modify each other's state), yes, they are threadsafe.

  • https://www.youtube.com/watch?v=eiC58R16hb8 JavaScript Visualized - Event Loop, Web APIs, (Micro)task Queue

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