src/Git/SharedMutex.h

   1 /**
   2 * SharedMutex.h
   3 * @Author   Tu Yongce <yongce (at) 126 (dot) com>
   4 * @Created  2008-11-17
   5 * @Modified 2008-11-17
   6 * @Version  0.1
   7 */
   8
   9 #ifndef SHARED_MUTEX_H_INCLUDED
  10 #define SHARED_MUTEX_H_INCLUDED
  11
  12 #ifndef _WIN32
  13 #error "works only on Windows"
  14 #endif
  15
  16 #include <windows.h>
  17
  18 // ¿É¹²ÏíµÄ»¥³âÁ¿
  19 class SharedMutex
  20 {
  21 private:
  22     HANDLE m_mutex;
  23     HANDLE m_sharedEvent;
  24     HANDLE m_exclusiveEvent;
  25
  26     volatile int m_sharedNum;
  27     volatile int m_exclusiveNum;
  28     volatile int m_lockType;
  29
  30     static const int LOCK_NONE = 0;
  31     static const int LOCK_SHARED = 1;
  32     static const int LOCK_EXCLUSIVE = 2;
  33
  34 public:
  35     SharedMutex();
  36         void Init();
  37         void Release();
  38 //      SharedMutex(SharedMutex &mutex);
  39 //      SharedMutex & operator = (SharedMutex &mutex);
  40
  41     ~SharedMutex();
  42
  43     // »ñÈ¡¹²Ïí·ÃÎÊÈ¨
  44     bool AcquireShared(DWORD waitTime = INFINITE);
  45     // ÊÍ·Å¹²Ïí·ÃÎÊÈ¨
  46     void ReleaseShared();
  47
  48     // »ñÈ¡¶ÀÕ¼·ÃÎÊÈ¨
  49     bool AcquireExclusive(DWORD waitTime = INFINITE);
  50     // ÊÍ·Å¶ÀÕ¼·ÃÎÊÈ¨
  51     void ReleaseExclusive();
  52 };
  53
  54 #endif // SHARED_MUTEX_H_INCLUDED