pthread_mutexattr_destroy
pthread_mutexattr_destroy(&mtx_attr);
pthread_mutexattr_destroy(&mutex_attr);
VERIFY0(pthread_mutexattr_destroy(&attr));
extern int pthread_mutexattr_destroy(pthread_mutexattr_t *);
(void) pthread_mutexattr_destroy(&attr);
(void) pthread_mutexattr_destroy(&attr);
VERIFY0(pthread_mutexattr_destroy(&attr));
if ((r = pthread_mutexattr_destroy(&attr)) != 0) {