also set has_lock to 0 when a worker starts.
also set has_lock to 0 when a worker starts.

korusdipl/kore,bonifaido/kore,hhua/kore,zhcy/kore,hhua/kore,jorisvink/kore,bonifaido/kore,fourdollars/kore,hhua/kore,sinemetu1/kore,jorisvink/kore,bonifaido/kore