《C#多线程编程实战》2.10 SpinWait

emmm

这个SpinWait

中文是自旋等待的意思。

所谓自旋，就是自己追自己影子，周伯通的左右手互博，不好听就是放屁自己追着玩，小狗转圈咬自己的尾巴

SpinWait是一个结构体，并不是一个类。

书上给的是SpinOnce

就是执行一个自旋

说白的也就是等待一次

class Program
    {
        static void Main(string[] args)
        {
            var t1 = new Thread(UserModeWait);
            var t2 = new Thread(HybridSpinWait);

            WriteLine("Running user mode waiting");
            t1.Start();
            Thread.Sleep(20);
            _isCompleted = true;
            Thread.Sleep(TimeSpan.FromSeconds(1));
            _isCompleted = false;
            WriteLine("Running hybrid SpinWait construct waiting");
            t2.Start();
            Thread.Sleep(TimeSpan.FromSeconds(15));
            _isCompleted = true;
        }

        static volatile bool _isCompleted = false;

        static void UserModeWait()
        {
            while (!_isCompleted)
            {
                Write(".");
            }
            WriteLine();
            WriteLine("Waiting is complete");
        }

        static void HybridSpinWait()
        {
            var w = new SpinWait();
    
           
            while (!_isCompleted)
            {
                w.SpinOnce();
                //WriteLine(w.NextSpinWillYield);
            }
            WriteLine("Waiting is complete");
         
        }
    }