func (w *Writer) SetLevels(levels map[string]string) {
	w.mutex.Lock()
	w.setLevels(levels)
	w.mutex.Unlock()
}
func (w *Writer) SetLevels(levels map[string]string) {
	w.mutex.Lock()
	w.setLevels(levels)
	w.mutex.Unlock()
}
func ( w * Writer ) SetLevels ( levels map [ string ] string ) { w . mutex . Lock ( ) w . setLevels ( levels ) w . mutex . Unlock ( ) }
// SetLevels sets a list of levels and their associated actions.
// It replaces any existing level/effect mapping. If an unknown
// effect is supplied, a message is logged.
SetLevels sets a list of levels and their associated actions . It replaces any existing level / effect mapping . If an unknown effect is supplied a message is logged .