AtomicSwift

The atomic qualifier Swift was missing.

Installation

Pods

pod 'AtomicSwift'

Swift package manager

From Xcode, select File → Swift Packages → Add Package Dependency → Select your project → Search AtomicSwift

Usage

Just add the @Atomic qualifier before your variable declaration.

Example:

// the following example will crash

var aDictionary = [Int: Int]()

DispatchQueue.concurrentPerform(iterations: 1000) { _ in
    self.aDictionary[.random(in: 0...10000)] = "test"
}

// the following example won't crash

@Atomic
var anAtomicDictionary = [Int: Int]()

DispatchQueue.concurrentPerform(iterations: 1000) { _ in
    self.anAtomicDictionary[.random(in: 0...10000)] = "test"
}

GitHub