What is executed when using the sync method on the global DispatchQueue in Swift?

The sync method on the global DispatchQueue in Swift executes the passed block of code synchronously on that queue. This means that the current thread will wait for the block to finish executing before continuing.

If you call DispatchQueue.global().sync { ... }, then:

• The current thread is blocked until the block completes.
• The block is executed on a global (background) queue.

It is important to remember that calling sync on the same queue that is already executing code can lead to a deadlock.

Example:

DispatchQueue.global().sync {
    print("Executing on a global queue")
}
print("This code will run after the block")