_pthread_rwlock_rdlock
#define pthread_rwlock_rdlock _pthread_rwlock_rdlock
_pthread_rwlock_rdlock(l)
result = _pthread_rwlock_rdlock(&nss_lock);
result = _pthread_rwlock_rdlock(&nss_lock);
((ret = _pthread_rwlock_rdlock(&rwlock)) != 0)) { \
if (__isthreaded) _pthread_rwlock_rdlock(x); \
__strong_reference(_pthread_rwlock_rdlock, pthread_rwlock_rdlock);