Race Condition In a multithreaded environment, there are times when multiple threads access (data write action) the shared resources at the same time. This will lead to the data race and unexpected results. Getting unexpected results due to multiple threads writing the shared resources at the same time is also called Race Condition. Let us …
Dispatch group and operation queue There are times when we come across a situation in the project, where we need to execute multiple tasks one after another. Like download the image first and then process the image. In the above scenario, we can see a clear dependency that the image processing depends on the download …
Operation Queues Apart from GCD, Operation Queues can also be used to solve the multithreading scenarios in swift. Most of the concurrency problems can be solved using GCD. But there are times when we need some control over execution of the tasks. This is when Operation Queues can be used to solve those issues. Operation …
Dispatch Group Dispatch group is used when we want to execute a bunch of tasks asynchronously and monitor the execution completion when all the tasks added to the group are completed. Dispatch Group can be created like below: let group = DispatchGroup() There are times when we come across a situation in the project, where …
Grand Central Dispatch (GCD) If you have missed the introductory blog on the multithreading concept, please have look at that here GCD is a low level API for managing concurrent operations. Apple introduced GCD to manage concurrency in an easier way. There is no overhead on the developers to create and manage threads manually. System will take …
Introduction Every iOS application is associated with atleast one thread on the app launch. This is called the Main Thread. All the UI activities must be performed on this main thread. Have you ever heard of the statements like – Please perform this operation on the main thread Perform this expensive operation on the background …