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In computer science, the event loop is a programming construct or design pattern that waits for and dispatches events or messages in a program. The event loop works by making a request to some internal or external "event provider" , then calls the relevant event handler. The event loop is also sometimes referred to as the message dispatcher, message loop, message pump, or run loop.
The event-loop may be used in conjunction with a reactor, if the event provider follows the file interface, which can be selected or 'polled'. The event loop almost always operates asynchronously with the message originator.
When the event loop forms the central control flow construct of a program, as it often does, it may be termed the main loop or main event loop. This title is appropriate, because such an event loop is at the highest level of control within the program.