Swift 3.0 GCD写法练习

///获取全局主串行队列
        let OverallMainQueue = DispatchQueue.main
        //全局主串行队列异步执行
        OverallMainQueue.async {
            for _ in 1...100{
                print("OverallMainQueue" + "\(Thread.current)")
            }
        }
        //全局主串行队列同步步执行   会导致主队列死锁  不使用
        //        OverallMainQueue.sync {
        //            for _ in 1...100{
        //                print("OverallMainQueue" + "\(Thread.current)")
        //            }
        //        }
        
        ///获取全局并发队列
        let OverallConQueue = DispatchQueue.global()
        //全局并发队列异步执行
        OverallConQueue.async {
            for _ in 1...100{
                print("OverallConQueue" + "\(Thread.current)")
            }
            
        }
        //全局并发队列异步执行
        OverallConQueue.sync {
            for _ in 1...100{
                print("OverallConQueue" + "\(Thread.current)")
            }
        }
        
        
        /// 创建串行队列
        let serQueue = DispatchQueue(label: "ser.jiaxuli.com")
        
        //串行队列异步执行
        serQueue.async {
            for _ in 1...100{
                print("serQueue" + "\(Thread.current)")
            }
            //返回主线程
            DispatchQueue.main.async {
                print("currentQueue" + "\(Thread.current)")
            }
        }
        //串行队列同步直接
        serQueue.sync {
            for _ in 1...100{
                print("serQueue" + "\(Thread.current)")
            }
        }
        
        
        /// 创建并行队列
        let conQueue = DispatchQueue(label: "con.jiaxuli.com", qos: .default, attributes: .concurrent, autoreleaseFrequency:.inherit, target: nil)
        //并行队列异步执行
        conQueue.async {
            for _ in 1...100{
                print("conQueue" + "\(Thread.current)")
            }
        }
        //并行队列同步执行
        conQueue.sync {
            for _ in 1...100{
                print("conQueue" + "\(Thread.current)")
            }
        }

demo