30   pthread_rwlock_t    rwlock;  in main()  local
60   pthread_rwlock_init(&rwlock, 0);  in main()
61   pthread_rwlock_wrlock(&rwlock);  in main()
63   pthread_rwlock_unlock(&rwlock);  in main()
64   pthread_rwlock_destroy(&rwlock);  in main()
68   pthread_rwlock_init(&rwlock, 0);  in main()
69   pthread_rwlock_rdlock(&rwlock);  in main()
71   pthread_rwlock_rdlock(&rwlock);  in main()
72   pthread_rwlock_unlock(&rwlock);  in main()
73   pthread_rwlock_unlock(&rwlock);  in main()
74   pthread_rwlock_destroy(&rwlock);  in main()