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 pthread_mutexattr_t attr;
 pthread_mutex_t mutex;
 size_t const shared_var = 0;

 int main(){
     int rc =0;

     rc = pthread_mutexattr_settype(&mutex, PTHREAD_MUTEX_ERRORCHECK);
     if(rc != 0){
       /* Handle Error */
     }


     rc = pthread_mutex_init(&mutex, &attr);
     if(rc != 0){
       /* Handle Error */
     }


     rc = pthread_mutex_lock(&mutex);
     if(rc != 0){
       /* Handle Error */
     }

     /* Critical Region*/

     rc = pthread_mutex_unlock(&mutex);
     if(rc != 0){
       /* Handle Error */
     }


     return 0;
 }