线程同步中异常情况的处理

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading;
 6 
 7 namespace testLockList
 8 {
 9     class Program
10     {
11 
12         const int ThreadMaxNum = 5;//线程的最大数目
13         static void Main(string[] args)
14         {
15             TestList myList = new TestList();
16             for (int i = 0; i < ThreadMaxNum; i++)//同时建立5个进程，调用Add方法，看锁住了List,是否能对List里面的单个元素进行修改
17             {
18                 Thread myth = new Thread(TestList.add);
19                 myth.Name = string.Format("线程{0}", i);
20                 myth.IsBackground = true;
21                 myth.Start();
22             }
23             while (TestList.AddInvokeCount != 5)
24             {
25                 Thread.Sleep(500);
26             }
27 
28         }
29     }
30 
31     public class TestList
32     {
33         static List<tester> myList = new List<tester>();//一个List
34         static Mutex myMutex = new Mutex();          //信号量
35         public static int AddInvokeCount = 0;        //用于记录Add被调用的次数
36         public TestList()
37         {
38             myList.Add(new tester(0, 0));
39         }
40         static public void add()
41         {
42 
43             lock (myList)
44             {
45 
46 
47                 myMutex.WaitOne();  //信号量P操作
48                 int Num = myList.Count + 1;
49                 Thread.Sleep(1000);//保证线程等待
50 
51                 myList.Add(new tester(Num, Num));
52                 Console.WriteLine(Num);
53                 Console.WriteLine("线程{0}：增加", Thread.CurrentThread.Name);
54                 if (AddInvokeCount == 3)     //这里故意引发一个Exception
55                 {
56                     int b = 0;
57                     int a = 1 / b;
58                 }
59                 AddInvokeCount++;
60             }
61 
62         }
63     }
64     /// <summary>
65     /// 这个类只是用于测试
66     /// </summary>
67     public class tester
68     {
69         int a;
70         int b;
71         public tester(int a, int b)
72         {
73             this.a = a;
74             this.b = b;
75         }
76 
77     }
78 }

 1         static public void add()
 2         {
 3 
 4             try
 5             {
 6                 myMutex.WaitOne();  //信号量P操作
 7                 int Num = myList.Count + 1;
 8                 Thread.Sleep(1000);//保证线程等待
 9 
10                 myList.Add(new tester(Num, Num));
11                 Console.WriteLine(Num);
12                 Console.WriteLine("线程{0}：增加", Thread.CurrentThread.Name);
13                 if (AddInvokeCount == 3)     //这里故意引发一个Exception
14                 {
15                     int b = 0;
16                     int a = 1 / b;  
17                 }
18                 AddInvokeCount++;
19 
20             }
21             catch (System.Exception ex)
22             {
23 
24             }
25             finally
26             {
27                 myMutex.ReleaseMutex(); //信号量V操作
28             }
29 }