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| let serial1 = DispatchQueue(label: "com.besher.serial1") | |
| let serial2 = DispatchQueue(label: "com.besher.serial2") | |
| serial1.sync { // <---- we changed this to 'sync' | |
| for _ in 0..<5 { print("🔵") } | |
| } | |
| // we don't get here until first loop terminates | |
| serial2.async { | |
| for _ in 0..<5 { print("🔴") } | |
| } |
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