_Tthr_rwlock_wrlock
[PJT_RWLOCK_WRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_wrlock)},
int _Tthr_rwlock_wrlock(pthread_rwlock_t *);
__weak_reference(_Tthr_rwlock_wrlock, pthread_rwlock_wrlock);
__weak_reference(_Tthr_rwlock_wrlock, _pthread_rwlock_wrlock);