Millised GCD-s saadaval olevad järjekorratüübid ja kuidas need erinevad käitumise ja kasutamise poolest?

GCD offers the following types of queues:

1. Serial Queues

   • Execute tasks sequentially, one after another.
   • Used for synchronizing access to resources and avoiding race conditions.
   • Custom serial queues can be created.

2. Concurrent Queues

   • Execute multiple tasks simultaneously.
   • There are global concurrent queues with different priorities (QoS).
   • Allow efficient utilization of multi-core systems.

3. Main Queue

   • A serial queue associated with the main thread of the application.
   • Used for updating the UI and other operations that must be performed on the main thread.

Differences and usage:

• Serial queues guarantee execution order and prevent concurrent access to shared resources.
• Concurrent queues increase performance by executing tasks simultaneously.
• The main queue is mandatory for working with UI in iOS.

Example of creating and using a serial queue:

let serialQueue = DispatchQueue(label: "com.example.serial")
serialQueue.async {
    // Task 1
}
serialQueue.async {
    // Task 2, which will be executed after Task 1
}