多线程 全局变量 部分函数加锁问题

具体见：

http://blog.csdn.net/theplayerwuliang/article/details/6431722

复制代码可运行：

 1 #pragma once 
 2 #include "stdafx.h"
 3 #include < windows.h > 
 4 //class InstanceLock; 
 5 class InstanceLockBase 
 6      { 
 7         friend class InstanceLock; 
 8         CRITICAL_SECTION cs; 
 9         void Lock() 
10             { 
11                 ::EnterCriticalSection( & cs); 
12         } 
13         void Unlock() 
14              { 
15                 ::LeaveCriticalSection( & cs); 
16         } 
17 protected : 
18     InstanceLockBase() 
19      { 
20             ::InitializeCriticalSection( & cs); 
21     } 
22     ~ InstanceLockBase() 
23          { 
24             ::DeleteCriticalSection( & cs); 
25     } 
26 } ; 
27 class InstanceLock 
28      { 
29         InstanceLockBase * _pObj; 
30 public : 
31     InstanceLock(InstanceLockBase * pObj) 
32      { 
33             _pObj = pObj; 
34             if (NULL != _pObj) 
35                 _pObj -> Lock(); 
36     } 
37     ~ InstanceLock() 
38         { 
39             if (NULL != _pObj) 
40                 _pObj -> Unlock(); 
41     } 
42 } ;
43 
44 void Say( char * text) 
45      { 
46         static int count = 0 ; 
47         SYSTEMTIME st; 
48         ::GetLocalTime( & st); 
49         printf( " %03d [%02d:%02d:%02d.%03d]%s " , ++ count, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, text); 
50 }
51 
52 class MyClass: public InstanceLockBase 
53     {} ; 
54 MyClass mc;
55 
56 DWORD CALLBACK ThreadProc(LPVOID param) 
57      { 
58         InstanceLock il( & mc); 
59         Say( " in sub thread, lock\n " ); 
60         Sleep( 2000 ); 
61         Say( " in sub thread, unlock\n " ); 
62         return 0 ; 
63 }
64 
65 
66 
67 int main()
68 {
69     while(1)
70 {    CreateThread( 0 , 0 , ThreadProc, 0 , 0 , 0 ); 
71     InstanceLock il( & mc); 
72     Say( " in main thread, lock \n" ); 
73     Sleep( 3000 ); 
74     Say( " in main thread, unlock \n" );
75     }
76     
77     return 0;
78 }

 

posted @ 2017-06-05 21:21  Henry2017  阅读(414)  评论(0)  编辑  收藏  举报