What data type is used to implement a global queue?

To implement a global queue in iOS, the DispatchQueue type from GCD (Grand Central Dispatch) is usually used. It is an object that manages the execution of tasks in a specific order.

Global queues are system queues with different priorities, which can be accessed via:

let queue = DispatchQueue.global(qos: .default)

Tasks added to such a queue will be executed asynchronously and in the order they were added (FIFO), which implements queue behavior.

If a custom queue is needed, it can be created as follows:

let customQueue = DispatchQueue(label: "com.example.myqueue")

Thus, the DispatchQueue type is used for a global queue.