code: func atomGet(xu *xgbutil.XUtil, name string) (xproto.Atom, bool) {
  	xu.AtomsLck.RLock()
  	defer xu.AtomsLck.RUnlock()
  
  	aid, ok := xu.Atoms[name]
  	return aid, ok
  }
docs: // atomGet retrieves an atom identifier from a cache if it exists.