Is a separate Run Loop prepared for each execution queue in the system?

In iOS, a separate Run Loop is not created for each Dispatch Queue. A Run Loop is a mechanism that manages events and timers in a thread, usually associated with the main thread and some additional threads.

The main Run Loop is automatically started in the main thread of the application and handles UI events and other system events. For background threads, a Run Loop is created only if explicitly started, for example, to process events in a loop.

GCD (Grand Central Dispatch) queues operate independently of Run Loops; they manage the execution of tasks asynchronously but do not require a separate Run Loop for each queue. Therefore, Run Loop and Dispatch Queue are different mechanisms, and a separate Run Loop is not created for each queue.