https://abhishekshukla.dev/tags/actors/Recent content in Actors on Abhishek ShuklaHugoen-usThu, 02 Jul 2026 09:30:00 +0530https://abhishekshukla.dev/blog/swift-actor-reentrancy/Thu, 02 Jul 2026 09:30:00 +0530https://abhishekshukla.dev/blog/swift-actor-reentrancy/<p>With the introduction of Swift Concurrency, <strong>Actors</strong> became the ultimate tool for protecting shared mutable state. By isolating their state and ensuring that only one task can access that state at a time, actors eliminate traditional data races.</p> <p>However, they introduce a new, subtle, and incredibly dangerous concept that trips up even experienced developers: <strong>Actor Reentrancy</strong>.</p> <p>If you assume that an actor behaves exactly like a serial <code>DispatchQueue</code> or an <code>NSLock</code>, you are going to write buggy code. Let’s explore what actor reentrancy is, why it breaks your logic, and how to fix it using a real-world banking scenario.</p>