When does nodeJS check for the callback queue for executing callbacks?

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As I understand , a Node JS server continues to listen on a port for any incoming requests which means the thread is continuously busy ? When does it break from this continuous never ending loop and check if there are any events to be processed from the call back queue?

2) When Node JS starts executing code of callback functions, the server is essentially stopped? It is not listening for further requests? I mean since only single thread is going to do both the task only one can be done at a time?

Is this understanding correct or there's more to it?

node.js
2 Answers

Yes, you are right. Everything in nodejs runs on the main thread except the I/o calls and fs file calls which go into to OS kernel and thread pool respectively for execution. All the synchronous code runs on the main thread and while this code is running, nodejs cannot process any further requests. That is why it is not advisable to use a long for loop because it may block the main thread for much time. You need to make child threads to handle that.

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