How is work with multiple threads implemented in the Swift language?

In Swift, the most commonly used framework for working with multiple threads is Grand Central Dispatch (GCD). GCD allows creating and managing task queues (dispatch queues), which can be executed concurrently or serially.

Main types of queues:

• Serial queue — tasks are executed one after another.
• Concurrent queue — tasks can be executed simultaneously on different threads.

Example of creating and using a concurrent queue:

let queue = DispatchQueue(label: "com.example.myqueue", attributes: .concurrent)

queue.async {
    print("Task 1")
}

queue.async {
    print("Task 2")
}

Swift also has the OperationQueue class and Operation for more complex task management, dependencies, and priorities.

To synchronize access to shared resources, you can use DispatchSemaphore, DispatchGroup, or NSLock.

Thus, multithreading in Swift is implemented through convenient high-level abstractions that allow efficient management of parallel code execution.