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@comfly comfly/Using queues.swift
Last active Aug 31, 2016

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let queue = dispatch_queue_create("QUEUE", DISPATCH_QUEUE_CONCURRENT)
var holder: Int = 10
func readSafe() -> Int {
var read: Int!
dispatch_sync(queue) {
read = holder
return read
func writeSafe(value: Int) {
dispatch_barrier_async(queue) {
holder = value
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