112233

#include "pthread.h"
#include 
  
   
using std::cout;
using std::endl;
using std::cin;
class ABClock{
public:
 virtual ~ABClock(){}
 virtual void lock()=0;
 virtual void unlock()=0;
};
class MutexLock:public ABClock{
public:
 MutexLock(){ pthread_mutex_init(&alock,NULL);}  
 ~MutexLock(){ pthread_mutex_destroy( &alock);}
 inline void lock(){ pthread_mutex_lock(&alock);}
 inline void unlock(){ pthread_mutex_unlock( &alock);}
private:
 pthread_mutex_t alock;
};
int main() 
{
 cout<<"hello"<
   
    >a; return 0; }