interface TransactionLockSet
{
    void lock(in CosTransactions::Coordinator current, in lock_mode mode);
    boolean try_lock(in CosTransactions::Coordinator current,
            in lock_mode mode);
    void unlock(in CosTransactions::Coordinator current, in lock_mode mode)
        raises (LockNotHeld);
    void change_mode(in CosTransactions::Coordinator current,
            in lock_mode held_mode, in lock_mode new_mode)
        raises(LockNotHeld);
    LockCoordinator get_coordinator(in CosTransactions::Coordinator which);
};