extern int __pthread_mutex_init (pthread_mutex_t *__restrict __mutex,
__const pthread_mutexattr_t *__restrict __mutex_attr) attribute_hidden;
extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex) attribute_hidden;
extern int __pthread_mutex_lock (pthread_mutex_t *__mutex) attribute_hidden;
extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex) attribute_hidden;
extern int __pthread_mutex_init (pthread_mutex_t *__restrict __mutex,
__const pthread_mutexattr_t *__restrict __mutex_attr) attribute_hidden;
extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex) attribute_hidden;
extern int __pthread_mutex_lock (pthread_mutex_t *__mutex) attribute_hidden;
extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex) attribute_hidden;