多线程交叉运行思考

  1 // ThreadPrintOddEven.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
  2 //
  3 
  4 #include "pch.h"
  5 #include <iostream>
  6 #include <Windows.h>
  7 #include <time.h>
  8 #include <stdlib.h>
  9 #include <process.h>
 10 
 11 
 12 
 13 
 14 int g_number = 0;
 15 HANDLE g_hEvent = NULL;
 16 BOOL g_isFirst = true;
 17 
 18 unsigned int __stdcall threadFun1(void *param)
 19 {
 20     printf("Enter %s
", __FUNCTION__);
 21 
 22     while (1)
 23     {
 24         if (g_isFirst)
 25         {
 26             SetEvent(g_hEvent);
 27             g_isFirst = false;
 28         }
 29         DWORD dwWaitResult = WaitForSingleObject(g_hEvent, INFINITE);
 30 
 31         switch (dwWaitResult)
 32         {
 33             // Event object was signaled
 34         case WAIT_OBJECT_0:
 35             break;
 36             // An error occurred
 37         default:
 38             printf("Wait error (%d)
", GetLastError());
 39             return 0;
 40         }
 41 
 42         ResetEvent(g_hEvent);
 43 
 44         printf("threadFun1: AAAAAAAAAAAAAAAAAAAA	
");
 45         Sleep(850);
 46 
 47         SetEvent(g_hEvent);
 48     }
 49 
 50     return 0;
 51 }
 52 
 53 unsigned int __stdcall threadFun2(void *param)
 54 {
 55     printf("Enter %s
", __FUNCTION__);
 56 
 57     while (1)
 58     {
 59         DWORD dwWaitResult = WaitForSingleObject(g_hEvent, INFINITE);
 60 
 61         switch (dwWaitResult)
 62         {
 63             // Event object was signaled
 64         case WAIT_OBJECT_0:
 65             break;
 66             // An error occurred
 67         default:
 68             printf("Wait error (%d)
", GetLastError());
 69             return 0;
 70         }
 71 
 72         ResetEvent(g_hEvent);
 73                            
 74         printf("threadFun2: BBBBBBBBBBBBBBBBBBBB	
");
 75         Sleep(400);
 76 
 77         SetEvent(g_hEvent);
 78         //Sleep(800);
 79 
 80     }
 81 
 82     return 0;
 83 }
 84 
 85 unsigned int __stdcall threadFun3(void *param)
 86 {
 87     printf("Enter %s
", __FUNCTION__);
 88 
 89     while (1)
 90     {
 91         DWORD dwWaitResult = WaitForSingleObject(g_hEvent, INFINITE);
 92 
 93         switch (dwWaitResult)
 94         {
 95             // Event object was signaled
 96         case WAIT_OBJECT_0:
 97             break;
 98             // An error occurred
 99         default:
100             printf("Wait error (%d)
", GetLastError());
101             return 0;
102         }
103 
104         ResetEvent(g_hEvent);                        
105         printf("threadFun3: CCCCCCCCCCCCCCCCCCCC	
");
106         Sleep(600);
107 
108         SetEvent(g_hEvent);
109         //Sleep(800);
110     }
111 
112     return 0;
113 }
114 
115 int main(int argc, char* argv[])
116 {
117     g_hEvent = CreateEvent(NULL, false, 0, L"Event Test1");
118 
119     HANDLE hThread1 = NULL;
120     unsigned threadID1 = 0;
121 
122     hThread1 = (HANDLE)_beginthreadex(NULL, 0, threadFun1, NULL, 0, &threadID1);
123 
124     HANDLE hThread2 = NULL;
125     unsigned threadID2 = 0;
126 
127     hThread2 = (HANDLE)_beginthreadex(NULL, 0, threadFun2, NULL, 0, &threadID2);
128 
129     HANDLE hThread3 = NULL;
130     unsigned threadID3 = 0;
131 
132     hThread3 = (HANDLE)_beginthreadex(NULL, 0, threadFun3, NULL, 0, &threadID3);
133 
134     SetThreadPriority(hThread1, THREAD_PRIORITY_ABOVE_NORMAL);
135     SetThreadPriority(hThread2, THREAD_PRIORITY_BELOW_NORMAL);
136 
137     while (1);
138 
139     return 0;
140 }