_Tthr_rwlock_trywrlock
[PJT_RWLOCK_TRYWRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_trywrlock)},
int _Tthr_rwlock_trywrlock(pthread_rwlock_t *);
__weak_reference(_Tthr_rwlock_trywrlock, pthread_rwlock_trywrlock);
__weak_reference(_Tthr_rwlock_trywrlock, _pthread_rwlock_trywrlock);