rpcbaddr_cache_lock
pthread_rwlock_t rpcbaddr_cache_lock = PTHREAD_RWLOCK_INITIALIZER;
extern pthread_rwlock_t rpcbaddr_cache_lock;
rwlock_wrlock(&rpcbaddr_cache_lock);
rwlock_unlock(&rpcbaddr_cache_lock);
rwlock_rdlock(&rpcbaddr_cache_lock);
rwlock_unlock(&rpcbaddr_cache_lock);
rwlock_unlock(&rpcbaddr_cache_lock);
rwlock_wrlock(&rpcbaddr_cache_lock);
rwlock_unlock(&rpcbaddr_cache_lock);