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Jungpyo Hong
2021-07-02 03:41:22 -05:00
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@ -83,6 +83,7 @@ Feel free to fork this repository and pull requests!!
- [USage](#Accessibility-Usage) - [USage](#Accessibility-Usage)
- [GCD](#GCD) - [GCD](#GCD)
- [DispatchQueue](#DispatchQueue) - [DispatchQueue](#DispatchQueue)
- [Thread Safety](#thread-safety)
- [DispatchGroup](#DispatchGroup) - [DispatchGroup](#DispatchGroup)
- [DispatchWorkItem](#DispatchWorkItem) - [DispatchWorkItem](#DispatchWorkItem)
- [Operation](#operation) - [Operation](#operation)
@ -1272,12 +1273,21 @@ GCD(Grand Central Dispatch) is a low-level API for managing concurrent operation
## DispatchQueue ## DispatchQueue
An object that manages the execution of tasks serially or concurrently on your app's main thread or on a background thread. An object that manages the execution of tasks serially or concurrently on your app's main thread or on a background thread.
#### main ### main
We can say main is a serial queue We can say main is a serial queue
#### global() ### global()
We can say global is a concurrent queue We can say global is a concurrent queue
## Thread Safety
[Concurrency & Thread Safety in Swift](https://medium.com/cubo-ai/concurrency-thread-safety-in-swift-5281535f7d3a)
1. Dispatch Barrier
2. Dispatch Semaphore
3. NSLock
## DispatchGroup ## DispatchGroup