int real_pthread_mutex_init(pthread_mutex_t *__mutex, const pthread_mutexattr_t *__mutexattr);
int real_pthread_mutex_lock (pthread_mutex_t *__mutex);
int real_pthread_mutex_unlock (pthread_mutex_t *__mutex);
int real_pthread_mutex_init(pthread_mutex_t *__mutex, const pthread_mutexattr_t *__mutexattr);
int real_pthread_mutex_lock (pthread_mutex_t *__mutex);
int real_pthread_mutex_unlock (pthread_mutex_t *__mutex);