// singleton.h
// -----------

template <typename T>
class CSingleton
{
private:
	CSingleton();
	~CSingleton();

protected:
	static volatile	LONG m_lLock;

public:
	static T* GetInstance()
	{
		// Wait for the variable to unlock and lock it
		while (::InterlockedExchange(&m_lLock, 1))
			::Sleep(1);

		// Create a single instance of the object (only if it's not yet exists)
		static T object;

		// Unlock
		::InterlockedExchange(&m_lLock, 0);

		return &object;
	}
};