_thr_rwlock_init
[PJT_RWLOCK_INIT] = {DUAL_ENTRY(_thr_rwlock_init)},
int _thr_rwlock_init(pthread_rwlock_t *, const pthread_rwlockattr_t *);
__weak_reference(_thr_rwlock_init, pthread_rwlock_init);
__weak_reference(_thr_rwlock_init, _pthread_rwlock_init);