Create thread safe array in Swift

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Update for Swift

The recommended pattern for thread-safe access is using dispatch barrier:

let queue = DispatchQueue(label: "thread-safe-obj", attributes: .concurrent)

// write
queue.async(flags: .barrier) {
    // perform writes on data
}

// read
var value: ValueType!
queue.sync {
    // perform read and assign value
}
return value

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