Swift Concurrency, Part 1: Tasks, Executors, and Priority Escalation

Swift 6 introduced a new approach to concurrency in apps. In this article, we will explore the problems it aims to solve, explain how it works under the hood, compare the new model with the previous one, and take a closer look at the Actor model. In the upcoming parts, we will also break down executors, schedulers, structured concurrency, different types of executors, implement our own executor, and more. Swift Concurrency Overview: Problems and Solutions Concurrency has long been one of the most challenging aspects of software development. Writing code that runs tasks simultaneously can improve performance and responsiveness, but it often introduces complexity and subtle bugs as race conditions, deadlocks, and thread-safety issues.