C# System.Threading.AutoResetEvent

 1 using System;
 2 using System.Threading;
 3 
 4 // Visual Studio: Replace the default class in a Console project with 
 5 //                the following class.
 6 class Example
 7 {
 8     private static AutoResetEvent event_1 = new AutoResetEvent(true);
 9     private static AutoResetEvent event_2 = new AutoResetEvent(false);
10 
11     static void Main()
12     {
13         Console.WriteLine("Press Enter to create three threads and start them.\r\n" +
14                           "The threads wait on AutoResetEvent #1, which was created\r\n" +
15                           "in the signaled state, so the first thread is released.\r\n" +
16                           "This puts AutoResetEvent #1 into the unsignaled state.");
17         Console.ReadLine();
18             
19         for (int i = 1; i < 4; i++)
20         {
21             Thread t = new Thread(ThreadProc);
22             t.Name = "Thread_" + i;
23             t.Start();
24         }
25         Thread.Sleep(250);
26 
27         for (int i = 0; i < 2; i++)
28         {
29             Console.WriteLine("Press Enter to release another thread.");
30             Console.ReadLine();
31             event_1.Set();
32             Thread.Sleep(250);
33         }
34 
35         Console.WriteLine("\r\nAll threads are now waiting on AutoResetEvent #2.");
36         for (int i = 0; i < 3; i++)
37         {
38             Console.WriteLine("Press Enter to release a thread.");
39             Console.ReadLine();
40             event_2.Set();
41             Thread.Sleep(250);
42         }
43 
44         // Visual Studio: Uncomment the following line.
45         //Console.Readline();
46     }
47 
48     static void ThreadProc()
49     {
50         string name = Thread.CurrentThread.Name;
51 
52         Console.WriteLine("{0} waits on AutoResetEvent #1.", name);
53         event_1.WaitOne();
54         Console.WriteLine("{0} is released from AutoResetEvent #1.", name);
55 
56         Console.WriteLine("{0} waits on AutoResetEvent #2.", name);
57         event_2.WaitOne();
58         Console.WriteLine("{0} is released from AutoResetEvent #2.", name);
59 
60         Console.WriteLine("{0} ends.", name);
61     }
62 }
63 
64 /* This example produces output similar to the following:
65 
66 Press Enter to create three threads and start them.
67 The threads wait on AutoResetEvent #1, which was created
68 in the signaled state, so the first thread is released.
69 This puts AutoResetEvent #1 into the unsignaled state.
70 
71 Thread_1 waits on AutoResetEvent #1.
72 Thread_1 is released from AutoResetEvent #1.
73 Thread_1 waits on AutoResetEvent #2.
74 Thread_3 waits on AutoResetEvent #1.
75 Thread_2 waits on AutoResetEvent #1.
76 Press Enter to release another thread.
77 
78 Thread_3 is released from AutoResetEvent #1.
79 Thread_3 waits on AutoResetEvent #2.
80 Press Enter to release another thread.
81 
82 Thread_2 is released from AutoResetEvent #1.
83 Thread_2 waits on AutoResetEvent #2.
84 
85 All threads are now waiting on AutoResetEvent #2.
86 Press Enter to release a thread.
87 
88 Thread_2 is released from AutoResetEvent #2.
89 Thread_2 ends.
90 Press Enter to release a thread.
91 
92 Thread_1 is released from AutoResetEvent #2.
93 Thread_1 ends.
94 Press Enter to release a thread.
95 
96 Thread_3 is released from AutoResetEvent #2.
97 Thread_3 ends.
98  */