extern int pthread_create (pthread_t *__restrict __newthread,
			   const pthread_attr_t *__restrict __attr,
			   void *(*__start_routine) (void *),
			   void *__restrict __arg) __THROWNL __nonnull ((1, 3));

extern int __pthread_create_2_1 (pthread_t *newthread,
				 const pthread_attr_t *attr,
				 void *(*start_routine) (void *), void *arg);