Async vs Sync
All the queues we've seen so far have been executed with the keyword async. However, there's an option to execute them with sync. The difference is that async tasks will not run until sync tasks have finished their execution.
Let's see an example using two queues with async.
DispatchQueue.global(qos: .background).async {
for i in 0..<5 {
print("👾 \(i)")
}
}
DispatchQueue.global(qos: .userInteractive).async {
for i in 0..<5 {
print("🤖 \(i)")
}
}
As we mentioned earlier, .userInteractive has higher priority than .background.
🤖 0
👾 0
👾 1
🤖 1
🤖 2
🤖 3
🤖 4
👾 2
👾 3
👾 4
If we execute our background queue with sync, we will see that this queue finishes execution first.
Continue reading
Access to all the content with our plans.
- Junior level content
- Senior level content
- Expert level content
- Extra content
- Question submissions
Monthly
Yearly
-
Unlimited access to the whole content
- Junior level content
- Senior level content
- Expert level content
- Extra content
- Question submissions
-
Unlimited access to the whole content
- Junior level content
- Senior level content
- Expert level content
- Extra content
- Question submissions
-
Solve your doubts at any level
- Junior level content
- Senior level content
- Expert level content
- Extra content
- 2 Question submissions per week
-
Solve your doubts at any level
- Junior level content
- Senior level content
- Expert level content
- Extra content
- 2 Question submissions per week
Be the first to comment