Grand Central Dispatch (GCD), How Yelp uses GCD - iOS Conf SG 2015

[@lqv3223]

tysm

[@jamalaitlhassan2364]

Can you please post the presentation ? (may be on Github as you have an account). Anyway thanks for the video.

[@xLGsusx]

Where can i get the "Cat Pyramid Demo"? i'm having some troubles to use GCD in the correct way. This is a great explanation about GCD. Thanks!

[@xLGsusx]

Sorry, found it (github.com/benasher44/SGConf2015Demo). One question, why do you have an Async Queue calling to main inside an another Async Queue with ImageProcessingQueue in the Serial example? It's for waiting until the ImageProcessingQueue is done?

[@AdamChad-v8u]

Linnea Shoals

[@godwincharan]

In slide 15 it says that there 5 Global Concurrent Queue. But iOS app has only 4 concurrent queue. And what you said is right there are 5 Global queue (including main queue) for each of the QOS class. Main queue has QOS as User Interactive. Global Concurrent Queues In the past, GCD has provided high, default, low, and background global concurrent queues for prioritizing work. Corresponding QoS classes should now be used in place of these queues. Table 4-6 describes the mappings between these queues and their corresponding QoS classes. Table 4-6GCD global concurrent queue to QoS mappings Global queue Corresponding QoS class Main thread User-interactive DISPATCH_QUEUE_PRIORITY_HIGH User-initiated DISPATCH_QUEUE_PRIORITY_DEFAULT Default DISPATCH_QUEUE_PRIORITY_LOW Utility DISPATCH_QUEUE_PRIORITY_BACKGROUND Background Can anyone confirm this?

[@dannylones2159]

14:48 introducing 'special' queue - main 5 queue was without this queue

[@dannylones2159]

- (BOOL) areYouSureWeReadyForThis 🤣