_thr_rwlock_tryrdlock
ret = _thr_rwlock_tryrdlock(&prwlock->lock, flags);
if (_thr_rwlock_tryrdlock(&prwlock->lock, flags) == 0) {
ret = _thr_rwlock_tryrdlock(&prwlock->lock, flags);
if (_thr_rwlock_tryrdlock(rwlock, URWLOCK_PREFER_READER) == 0)
if (_thr_rwlock_tryrdlock(rwlock, flags) == 0)