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func performUsingGroup() { | |
let dq1 = DispatchQueue.global(qos: .default) | |
let dq2 = DispatchQueue.global(qos: .default) | |
let group = DispatchGroup() | |
for i in 1...3 { | |
dq1.async(group: group) { | |
print("\(#function) DispatchQueue 1: \(i)") | |
} | |
} | |
for i in 1...3 { | |
dq2.async(group: group) { | |
print("\(#function) DispatchQueue 2: \(i)") | |
} | |
} | |
group.notify(queue: .main) { | |
print("done by group") | |
} | |
} | |
func performUsingSemaphore() { | |
let dq1 = DispatchQueue.global(qos: .default) | |
let dq2 = DispatchQueue.global(qos: .default) | |
let semaphore = DispatchSemaphore(value: 1) | |
DispatchQueue.global().async { | |
for i in 1...3 { | |
_ = semaphore.wait(timeout: .distantFuture) | |
dq1.async { | |
print("\(#function) DispatchQueue 1: \(i)") | |
semaphore.signal() | |
} | |
} | |
for i in 1...3 { | |
_ = semaphore.wait(timeout: .distantFuture) | |
dq2.async { | |
print("\(#function) DispatchQueue 2: \(i)") | |
semaphore.signal() | |
} | |
} | |
} | |
} |
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