Random numbers

boost::mutex io_mutex;
        boost::thread_group group;
        for (int i = 0; i < 4; ++i) {group.create_thread(boost::bind(&StartThread, boost::ref(io_mutex)));}
        group.join_all();

void StartThread(boost::mutex& mutex)
{
    int max=GetRandomNumbers(boost::ref(mutex));
    boost::lock_guard<boost::mutex> lock(mutex);
    cout<<max<<endl;
}

int GetRandomNumbers(boost::mutex& mutex)
{
    boost::lock_guard<boost::mutex> lock(mutex);
    typedef boost::lagged_fibonacci607 RNGType;
    RNGType rng;
    boost::uniform_int<> one_to_six( 1, 600 );
    boost::variate_generator< RNGType, boost::uniform_int<> >dice(rng, one_to_six);
    int max = dice();
    return max;
}

srand(static_cast<unsigned>(std::time(0)));
tmp=rand() % max + min;

int Random::GetRND()
{
    typedef boost::lagged_fibonacci607 RNGType;
    RNGType rng(seed);
    boost::uniform_int<> one_to_six(10000000, 100000000 );
    boost::variate_generator< RNGType, boost::uniform_int<> >dice(rng, one_to_six);
    int max = dice();
    seed++;
    return max;
}

Random r;
int max=r.GetRND();

unsigned long int Random::GetRND()
{
    boost::random::mt19937 rng(seed);
    boost::random::normal_distribution<> six(10000000,100000000);
    unsigned long int max = six(rng);   
    seed++;
    return max;
}