What is the role of DispatchWorkItem in task management in GCD system?

DispatchWorkItem in the Grand Central Dispatch (GCD) system is an object that encapsulates a block of code (task) that can be dispatched for execution in a queue.

Role of DispatchWorkItem:

• Allows creating tasks that can be started, canceled, or waited upon for completion.
• Provides management of the task's lifecycle.
• Enables adding completion notifications.

Example usage in Swift:

let workItem = DispatchWorkItem {
    print("Executing task")
}

DispatchQueue.global().async(execute: workItem)

// Later, you can cancel the task if it has not yet been executed
workItem.cancel()

Thus, DispatchWorkItem offers more flexible control over asynchronous tasks in GCD.