Do I need to worry about a failure in these synchronization APIs?

[ahmd]

Say, I have the following code:

template <typename T> 
struct SYNCHED_DATA
{
    SYNCHED_DATA()
    {
        hMutex = ::CreateMutex(NULL, FALSE, NULL);
    }
    ~SYNCHED_DATA()
    {
        if(hMutex)
            CloseHandle(hMutex);
        hMutex = NULL;
    }

    void set(T* pV)
    {
        if(pV)
        {
            ::WaitForSingleObject(hMutex, INFINITE);
            var = *pV;
            ::ReleaseMutex(hMutex);
        }
    }
    void get(T* pV)
    {
        if(pV)
        {
            ::WaitForSingleObject(hMutex, INFINITE);
            *pV = var;
            ::ReleaseMutex(hMutex);
        }
    }

private:
    HANDLE hMutex;
    T var;

    SYNCHED_DATA(const SYNCHED_DATA& s)
    {
    }
    SYNCHED_DATA& operator = (const SYNCHED_DATA& s)
    {
    }
};

Do I need to worry about WaitForSingleObject() and/or ReleaseMutex() failing in this case?