how to make this template class thread-safe?

whaa

//CxxTst.cpp

#include <stdio.h>;
#include <stdlib.h>;
#include <pthread.h>;

template <class Type>; class CMyData
{
public:
        Type Get()
        {
                Type t;
               
                pthread_mutex_lock(&amp;lock);
                t =  m_T;
                pthread_mutex_unlock(&amp;lock);

                return t;            
        }
       
        void Set(Type t)
        {      
                pthread_mutex_lock(&amp;lock);
                m_T = t;
                pthread_mutex_unlock(&amp;lock);

                return;   
        }
public:
        CMyData()
        {
                pthread_mutex_init(&amp;lock);
        }
        ~CMyData() {};
       
private:

        pthread_mutex_t lock;

        Type m_T;  
};

void main()
{
        CMyData<int>; var;

        var.Set(100);
        var.Get();

        return;
}

//////////////////////////////////////////////////////////
Here is my complitation result on a sun workstation. but Why????????
who can tell me How to get an thread-safe template class.?????

sundemo>;CC -o xxx CxxTst.cpp
"CxxTst.cpp", line 44: Warning (Anachronism): main() must have a return type of int.
"CxxTst.cpp", line 32: Error: Too few arguments in call to "pthread_mutex_init(_pthread_mutex*, const _pthread_mutexattr*)".
"CxxTst.cpp", line 45:     Where: While instantiating "CMyData<int>;::CMyData()".
"CxxTst.cpp", line 45:     Where: Instantiated from non-template code.