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import Foundation

let condition = NSCondition()

var done = false

DispatchQueue.main.async {
    (0...100000000).forEach { print($0) }

    condition.lock()
    done = true
    condition.unlock()
}

condition.lock
condition.wait(until: done)
condition.unlock

print("Done")

import Foundation

extension NSCondition {
    
    func wait(until condition: @autoclosure () -> Bool) {
        while !condition() {
            wait()
        }
    }
}