What methods and approaches to multithreading management are you familiar with?

In iOS, the following methods and approaches are commonly used for multithreading management:

• GCD (Grand Central Dispatch) — a high-level API for asynchronously executing tasks on various queues (serial, concurrent). It allows easy creation of background tasks and management of priorities.

• Operation and OperationQueue — a more object-oriented approach, where tasks are represented by Operation objects that can be queued, have dependencies set between them, canceled, and monitored.

• NSThread — a lower-level way of creating and managing threads, used less frequently due to complexity and higher likelihood of errors.

• DispatchSemaphore and DispatchGroup — for thread synchronization and waiting for a group of tasks to complete.

• Using thread-safe data structures and synchronization mechanisms (e.g., @synchronized, NSLock, mutex) to prevent data races.

Example of using GCD:

DispatchQueue.global(qos: .background).async {
    // Background task
    let result = heavyCalculation()
    DispatchQueue.main.async {
        // UI update
        self.label.text = "Result: \(result)"
    }
}