1         //需要加锁的静态全局变量2         private static bool _isOK = false;3         //lock只能锁定一个引用类型变量4         private static object _lock = new object();5         static void MLock()6         {7             //多线程8             new System.Threading.Thread(Done).Start();9             new System.Threading.Thread(Done).Start();
10             Console.ReadLine();
11         }
12
13         static void Done()
14         {
15             //lock只能锁定一个引用类型变量
16             lock (_lock)
17             {
18                 if (!_isOK)
19                 {
20                     Console.WriteLine("OK");
21                     _isOK = true;
22                 }
23             }
24         } 

 1 public static class AsynAndAwait2  {3         //step 1 4         private static int count = 0;5         //用async和await保证多线程下静态变量count安全6         public async static void M1()7         {8             //async and await将多个线程进行串行处理9             //等到await之后的语句执行完成后
10             //才执行本线程的其他语句
11             //step 2
12             await Task.Run(new Action(M2));
13             Console.WriteLine("Current Thread ID is {0}", System.Threading.Thread.CurrentThread.ManagedThreadId);
14             //step 6
15             count++;
16             //step 7
17             Console.WriteLine("M1 Step is {0}", count);
18         }
19
20         public static void M2()
21         {
22             Console.WriteLine("Current Thread ID is {0}", System.Threading.Thread.CurrentThread.ManagedThreadId);
23             //step 3
24             System.Threading.Thread.Sleep(3000);
25             //step 4
26             count++;
27             //step 5
28             Console.WriteLine("M2 Step is {0}", count);
29         }
30 }