_thr_rwlock_trywrlock
ret = _thr_rwlock_trywrlock(&prwlock->lock);
ret = _thr_rwlock_trywrlock(&prwlock->lock);
if (_thr_rwlock_trywrlock(&prwlock->lock) == 0) {
if (_thr_rwlock_trywrlock(rwlock) == 0)
if (_thr_rwlock_trywrlock(rwlock) == 0)