fn uid(&self) -> Option<Uid> {
        if self.lock == UID_UNLOCKED {
            None
        } else {
            Some(self.lock)
        }
    }
/// uid that has locked this entry or None if unlocked
uid that has locked this entry or None if unlocked
uid that has locked this entry or None if unlocked
fn uid(&self) -> Option<Uid> {
        if self.lock == UID_UNLOCKED {
            None
        } else {
            Some(self.lock)
        }
    }
fn uid ( & self ) -> Option < Uid > { if self . lock == UID_UNLOCKED { None } else { Some ( self . lock ) } }
uid that has locked this entry or None if unlocked
uid that has locked this entry or None if unlocked
&self