modules/rosapps/applications/fraginator/Mutex.h

   1 /*****************************************************************************
   2
   3   Mutex
   4
   5 *****************************************************************************/
   6
   7
   8 #ifndef MUTEX_H
   9 #define MUTEX_H
  10
  11
  12 #include "Unfrag.h"
  13
  14
  15 class Mutex
  16 {
  17 public:
  18     Mutex ()
  19     {
  20         // NT only code begin ... Win9x disregards this part
  21         SECURITY_ATTRIBUTES MutexAttribs;
  22
  23         memset (&MutexAttribs, 0, sizeof (SECURITY_ATTRIBUTES));
  24
  25         MutexAttribs.bInheritHandle = false;
  26         MutexAttribs.nLength = sizeof (SECURITY_ATTRIBUTES);
  27         MutexAttribs.lpSecurityDescriptor = NULL;
  28         // NT only code end
  29
  30         Locked      = false;
  31         LockCount   = 0;
  32         MutexHandle = CreateMutex (&MutexAttribs, Locked, NULL);
  33
  34         return;
  35     }
  36
  37     ~Mutex ()
  38     {
  39         Lock ();
  40         CloseHandle (MutexHandle);
  41     }
  42
  43     void Lock (void)
  44     {
  45         Locked = true;
  46         WaitForSingleObject (MutexHandle, INFINITE);
  47         LockCount += 1;
  48         return;
  49     }
  50
  51
  52     void Unlock   (void)
  53     {
  54             LockCount -= 1;
  55             if (LockCount <= 0)
  56             {
  57                     LockCount = 0;
  58                     Locked = false;
  59         }
  60
  61         ReleaseMutex (MutexHandle);
  62         return;
  63     }
  64
  65
  66     bool IsLocked (void)
  67     {
  68         return (Locked);
  69     }
  70
  71 protected:
  72     uint32 LockCount;
  73     HANDLE MutexHandle;
  74     bool   Locked;
  75 };
  76
  77
  78 #endif // MUTEX_H