Mutex.h

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/*****************************************************************************
 
  Mutex
 
*****************************************************************************/
 
 
#ifndef MUTEX_H
#define MUTEX_H
 
 
#include "Unfrag.h"
 
 
class Mutex
{
public:
    Mutex ()
    {
        // NT only code begin ... Win9x disregards this part
        SECURITY_ATTRIBUTES MutexAttribs;
 
        memset (&MutexAttribs, 0, sizeof (SECURITY_ATTRIBUTES));
 
        MutexAttribs.bInheritHandle = false;
        MutexAttribs.nLength = sizeof (SECURITY_ATTRIBUTES);
        MutexAttribs.lpSecurityDescriptor = NULL;
        // NT only code end
 
        Locked      = false;
        LockCount   = 0;
        MutexHandle = CreateMutex (&MutexAttribs, Locked, NULL);
 
        return;
    }
 
    ~Mutex ()
    {
        Lock ();
        CloseHandle (MutexHandle);
    }
 
    void Lock (void)
    {
        Locked = true;
        WaitForSingleObject (MutexHandle, INFINITE);
        LockCount += 1;
        return;
    }
 
 
    void Unlock   (void)
    {
        LockCount -= 1;
        if (LockCount <= 0)
        {
            LockCount = 0;
            Locked = false;
        }
 
        ReleaseMutex (MutexHandle);
        return;
    }
 
 
    bool IsLocked (void)
    {
        return (Locked);
    }
 
protected:
    uint32 LockCount;
    HANDLE MutexHandle;
    bool   Locked;
};
 
 
#endif // MUTEX_H