只是把 Semaphore 换成了 EventWaitHandle。请与这个贴子中的例子进行比较:https://www.cnblogs.com/pencilstart/p/15865478.html
注意,由于 .NET 3.5下并没有官方实现的 Task 库,所以,是通过 VS 中 NuGet 取得的 非官方 实现的 Task 库,调用接口与官方.NET 4.0 后的应该是差不多的。
EventWaitHandle 初始化时,初始值为 signaled 的状态。
1 using System; 2 using System.Threading; 3 using System.Threading.Tasks; 4 5 namespace testEventWaitHandle 6 { 7 class Program 8 { 9 EventWaitHandle ewh = new EventWaitHandle(true, EventResetMode.AutoReset); 10 11 static int count = 0; 12 13 void test() 14 { 15 object param1 = new object[] { "Thread A", 0 }; 16 object param2 = new object[] { "Thread B", 500 }; 17 18 Action<object> a1 = new Action<object>(TaskProc); 19 Action<object> a2 = new Action<object>(TaskProc); 20 21 Task task1 = new TaskFactory().StartNew(a1, param1); 22 Task task2 = new TaskFactory().StartNew(a1, param2); 23 24 Task.WaitAll(task1, task2); 25 } 26 27 static void Main(string[] args) 28 { 29 Program p = new Program(); 30 31 p.test(); 32 33 Console.WriteLine("main end, mainthreadid = {0}", System.Threading.Thread.CurrentThread.ManagedThreadId); 34 } 35 36 void TaskProc(object args) 37 { 38 string name = (string)((object[])args)[0]; 39 int startdelay = (int)((object[])args)[1]; 40 41 Console.WriteLine("{0}: COME IN, threadid = {1}", name, System.Threading.Thread.CurrentThread.ManagedThreadId); 42 43 System.Threading.Thread.Sleep(startdelay); 44 45 Console.WriteLine("{0}: START, threadid = {1}", name, System.Threading.Thread.CurrentThread.ManagedThreadId); 46 47 for (int i = 0; i < 10; ++i) 48 { 49 ewh.WaitOne(); 50 51 Random r = new Random(); 52 53 int s = r.Next(50, 1000); 54 55 count = count + 1; 56 Console.WriteLine("{0}: i = {1}, sleep({2}), threadid = {3}, count = {4}", name, i, s, System.Threading.Thread.CurrentThread.ManagedThreadId, count); 57 58 System.Threading.Thread.Sleep(s); 59 60 ewh.Set(); 61 } 62 63 Console.WriteLine("{0}: END, threadid = {1}", name, System.Threading.Thread.CurrentThread.ManagedThreadId); 64 } 65 } 66 } 67 68 //Thread A: COME IN, threadid = 3 69 //Thread A: START, threadid = 3 70 //Thread A: i = 0, sleep(566), threadid = 3, count = 1 71 //Thread B: COME IN, threadid = 4 72 //Thread B: START, threadid = 4 73 //Thread B: i = 0, sleep(530), threadid = 4, count = 2 74 //Thread A: i = 1, sleep(918), threadid = 3, count = 3 75 //Thread B: i = 1, sleep(610), threadid = 4, count = 4 76 //Thread A: i = 2, sleep(759), threadid = 3, count = 5 77 //Thread B: i = 2, sleep(928), threadid = 4, count = 6 78 //Thread A: i = 3, sleep(961), threadid = 3, count = 7 79 //Thread B: i = 3, sleep(684), threadid = 4, count = 8 80 //Thread A: i = 4, sleep(935), threadid = 3, count = 9 81 //Thread B: i = 4, sleep(359), threadid = 4, count = 10 82 //Thread A: i = 5, sleep(883), threadid = 3, count = 11 83 //Thread B: i = 5, sleep(389), threadid = 4, count = 12 84 //Thread A: i = 6, sleep(148), threadid = 3, count = 13 85 //Thread B: i = 6, sleep(621), threadid = 4, count = 14 86 //Thread A: i = 7, sleep(161), threadid = 3, count = 15 87 //Thread B: i = 7, sleep(976), threadid = 4, count = 16 88 //Thread A: i = 8, sleep(430), threadid = 3, count = 17 89 //Thread B: i = 8, sleep(261), threadid = 4, count = 18 90 //Thread A: i = 9, sleep(682), threadid = 3, count = 19 91 //Thread A: END, threadid = 3 92 //Thread B: i = 9, sleep(139), threadid = 4, count = 20 93 //Thread B: END, threadid = 4 94 //main end, mainthreadid = 1 95 //请按任意键继续. . .