28.semaphore跨进程通信

  • 根据id创建Semaphore,并初始化有一个信号量可用 name类型是char *...; 
    1 HANDLE hsem = CreateSemaphoreA(NULL, 1, 1, name);

     

  • 关闭句柄 
    1 CloseHandle(hsem);

     

  • 根据id打开semaphore 
    1 HANDLE hsem = OpenSemaphoreA(SEMAPHORE_ALL_ACCESS, TRUE, name);

     

  • 接受Semaphore句柄 
    1 DWORD res = WaitForSingleObject(hsem, 20000);

     

  • 检测是否收到 
     1 switch (res)
 2     {
 3     case WAIT_OBJECT_0:
 4         printf("收到信号-------");
 5         break;
 6     case WAIT_TIMEOUT:
 7         printf("超时没有收到-------");
 8         break;
 9     case WAIT_ABANDONED:
10         printf("另外一个进程意外终止-------");
11         break;
12     default:
13         break;
14 
15     }

     

完整代码:

主信号.c

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <Windows.h>
 4 
 5 char name[100] = "haihualovefang";
 6 
 7 void main()
 8 {
 9     HANDLE hsem = CreateSemaphoreA(NULL, 0, 1, name);
10     printf("创建成功");
11     char ch = getch();
12 
13 
14     ReleaseSemaphore(hsem, 1, NULL);
15     printf("触发信号量");
16     CloseHandle(hsem);
17 
18 
19 }

wait.c

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <Windows.h>
 4 
 5 char name[100] = "haihualovefang";
 6 
 7 void main()
 8 {
 9 
10     HANDLE hsem = OpenSemaphoreA(SEMAPHORE_ALL_ACCESS, TRUE, name);;
11     if (hsem == NULL)
12     {
13         printf("打开失败");
14         system("pause");
15         return;
16     }
17     printf("等待-------");
18     DWORD res = WaitForSingleObject(hsem, 20000);
19     switch (res)
20     {
21     case WAIT_OBJECT_0:
22         printf("收到信号-------");
23         break;
24     case WAIT_TIMEOUT:
25         printf("超时没有收到-------");
26         break;
27     case WAIT_ABANDONED:
28         printf("另外一个进程意外终止-------");
29         break;
30     default:
31         break;
32 
33     }
34     CloseHandle(hsem);
35 
36 
37 
38     system("pause");
39 }

 

posted @ 2018-02-03 15:49  喵小喵~  阅读(593)  评论(0)  编辑  收藏  举报