线程之间灵活传递信号（ManualResetEventSlim ）

Posted 2022-10-02 kevintong

当主程序启动时，首先创建ManualResetEventSlim 类的一个实例。然后启动三个线程，等待事件信号通知它们继续执行。

 

 1 /// <summary>
 2         /// 创建 ManualResetEventSlim 实例
 3         /// </summary>
 4         private static ManualResetEventSlim _mainEvent = new ManualResetEventSlim(false);
 5 
 6         /// <summary>
 7         /// 接收信号继续执行
 8         /// </summary>
 9         /// <param name="threadName">线程名</param>
10         /// <param name="secods">时间（秒）</param>
11         public void TravelThroughGates(string threadName, int secods)
12         
13             // threadName  falls to sleep
14             System.Threading.Thread.Sleep(TimeSpan.FromSeconds(secods));
15 
16             // threadName waits for the gates to open
17             _mainEvent.Wait();      // 阻止当前线程，直到接收到信号
18 
19             // threadName enters the gates
20             Console.WriteLine($"threadName 继续执行");
21             
22         

 

线程只有在ManualResetEventSlim 对象发出信号才能继续执行，不然只有继续等待，直到接接收到信号。

 

 1 /// <summary>
 2         /// 输出
 3         /// </summary>
 4         public void Print()
 5         
 6             var t1 = new System.Threading.Thread(() => TravelThroughGates("Thread 1", 5));
 7             var t2 = new System.Threading.Thread(() => TravelThroughGates("Thread 2", 6));
 8             var t3 = new System.Threading.Thread(() => TravelThroughGates("Thread 3", 12));
 9 
10             t1.Start();
11             t2.Start();
12             t3.Start();
13             System.Threading.Thread.Sleep(TimeSpan.FromSeconds(6));
14 
15             // The gates are now open
16             _mainEvent.Set();   // 发射信号
17            
18             System.Threading.Thread.Sleep(TimeSpan.FromSeconds(2));
19             _mainEvent.Reset();     // 关闭信号
20 
21             // The gates have been closed
22             System.Threading.Thread.Sleep(TimeSpan.FromSeconds(10));
23 
24             // The gates are now open for the second time
25             _mainEvent.Set();   // 发射信号
26 
27             System.Threading.Thread.Sleep(TimeSpan.FromSeconds(2));
28 
29             //The gates have been closed
30             _mainEvent.Reset();     // 关闭信号
31