Semaphore多线程实例 

 1 // SemaphoreMultiThread.cpp : 定义控制台应用程序的入口点。
 2 //
 3 
 4 #include "stdafx.h"
 5 #include <stdio.h>
 6 #include "windows.h"
 7 #define MAX_SEM_COUNT 6
 8 #define THREADCOUNT 12
 9 
10 
11 HANDLE ghSemaphore;
12 DWORD WINAPI ThreadProc(LPVOID lparam);
13 
14 int _tmain(int argc, _TCHAR* argv[])
15 {
16     HANDLE aThread[THREADCOUNT];
17     DWORD ThreadID;
18     int i;
19 
20     //Create a semaphore with initial and max counts of MAX_SEM_COUNT
21     ghSemaphore = CreateSemaphore(NULL,MAX_SEM_COUNT,MAX_SEM_COUNT,NULL);
22     if (ghSemaphore == NULL)
23     {
24         printf("CreateSemphore error");
25         return 1;
26     }
27     for (int i=0; i<THREADCOUNT; i++)
28     {
29         aThread[i] = CreateThread(NULL,
30                                     0,
31                                     (LPTHREAD_START_ROUTINE)ThreadProc,
32                                     NULL,
33                                     0,
34                                     &ThreadID);
35         if (aThread[i] == NULL)
36         {
37             printf("Create Thread failed\n");
38             return 1;
39         }
40     }
41     WaitForMultipleObjects(THREADCOUNT,aThread,TRUE,INFINITE);
42     //Close thread and semphore
43     for (int i=0; i<THREADCOUNT; i++)
44     {
45         CloseHandle(aThread[i]);
46     }
47     CloseHandle(ghSemaphore);
48     system("pause");
49     return 0;
50 }
51 DWORD WINAPI ThreadProc(LPVOID lparam)
52 {
53     DWORD dwWaitResult;
54     BOOL bContinue = TRUE;
55     while (bContinue)
56     {
57         dwWaitResult = WaitForSingleObject(ghSemaphore,3L);
58         switch (dwWaitResult)
59         {
60             //Try to enter the semaphore gate.
61         case WAIT_OBJECT_0:
62             printf("Thread %d wait successed \n",GetCurrentThreadId());
63             bContinue = FALSE;
64             Sleep(5);
65             for (int x = 0; x<10; x++)
66             {
67                 printf("Thread %d task!\n",GetCurrentThreadId());
68             }
69             if (!ReleaseSemaphore(ghSemaphore, 1, NULL))
70             {
71                 printf("ReleaseSemaphore error:%d\n",GetLastError());
72             }
73             break;
74         case WAIT_TIMEOUT:
75             printf("Thread %d: wait timeout",GetCurrentThreadId());
76             break;
77         }
78         
79     }
80     return TRUE;
81 }
posted @ 2012-04-17 21:53  imFolish  阅读(456)  评论(0)  编辑  收藏  举报