The function int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr) destroys a read write attributes objects. A destroyed 'attr' attributes object can be reinitialized using pthread_rwlockattr_init(); If success, it returns 0. An error number may be returned if: [EINVAL] The value specified by 'attr' is invalid This function shall not return an error ecode of [EINTR]