Event loop
Sign Up to our Engineers Community Engine to ask questions, answer people’s questions, and connect with other people.
Login to our Engineers Community Engine to ask questions and answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
The event loop is what allows Node.js to perform non-blocking I/O operations — even though JavaScript is single-threaded — by offloading operations to the system kernel whenever possible.
When one of these operations completes, the kernel tells Node.js so that the appropriate callback may be added to the poll queue to eventually be executed. We’ll explain this in further detail later in this topic.
Event Loopis a program, which allows subscribing to system resource events. It provides a callback stack that can be linked to resources and executed when appropriate descriptors are ready.The
Event Loopabstraction might be already known to JavaScript developers as the concept is widely used in programming applications for browsers.