主线程
DispatchQueue.main.async {
NSLog("\(Thread.current)")
}
串行队列
- 同步依次执行,在主线程依次执行
let queue = DispatchQueue(label: "test")
for i in 0..<10 {
queue.sync {
NSLog("\(Thread.current) -- \(i)")
}
}
- 同步依次执行,在同一个线程执行
let queue = DispatchQueue(label: "test")
for i in 0..<10 {
queue.async {
NSLog("\(Thread.current) -- \(i)")
}
}
并行队列
- 创建多个线程,执行顺序不确定
let queue = DispatchQueue(label: "test", qos: .default, attributes: .concurrent, autoreleaseFrequency: .inherit, target: nil)
for i in 0..<10 {
queue.async {
NSLog("\(Thread.current) -- \(i)")
}
}
