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#ifndef _SYNCOBJECTS_HXX_
#define _SYNCOBJECTS_HXX_

//------------------------------------------------------------------------
// includes
//------------------------------------------------------------------------

#include <windows.h>

//------------------------------------------------------------------------
// a simple helper template for automatic locking/unlocking 
//------------------------------------------------------------------------

template< class LOCK >
class CLockGuard
{
public:
    CLockGuard( LOCK* aLock ) : 
        m_pLock( aLock )
    {
        m_pLock->Lock( );
    }

    ~CLockGuard( )
    {
        m_pLock->Unlock( );
    }

private:
    LOCK* m_pLock;
};

//------------------------------------------------------------------------
// a interface base class for different locking sub classes
//------------------------------------------------------------------------

class CSyncObject
{
public:
    virtual ~CSyncObject( ) = 0;

    virtual int Lock( )     = 0;
    virtual int Unlock( )   = 0;
};

//------------------------------------------------------------------------
// if no synchronization is necessary this class will be used 
// declaring the functions as inline safes runtime overhead
//------------------------------------------------------------------------

class CNullLock
{
public:
    inline virtual ~CNullLock ( ) {};
    inline virtual int Lock( )    {};
    inline virtual int Unlock()   {};
};

//------------------------------------------------------------------------
// a minimal wrapper for a win32 critical section
//------------------------------------------------------------------------

class CCriticalSection : public CSyncObject
{
public:
    CCriticalSection( );
    virtual ~CCriticalSection( );

    // both functions return always 0
    // because the win32 critsec functions
    // don't return any return code
    virtual int Lock( );
    virtual int Unlock( );

private:
    CRITICAL_SECTION m_critSec;
};


typedef CLockGuard< CSyncObject > SyncObjLockGuard_t;

#endif

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