string marshal_state();
void unmarshal_state(const string & state);
lock_protocol::status acquire(int &, lock_protocol::lockid_t, const callback_t & id, lock_protocol::xid_t);
string marshal_state();
void unmarshal_state(const string & state);
lock_protocol::status acquire(int &, lock_protocol::lockid_t, const callback_t & id, lock_protocol::xid_t);