4 int user_lock(unsigned int id1, unsigned int id2, LOCKMODE lockmode);
5 int user_unlock(unsigned int id1, unsigned int id2, LOCKMODE lockmode);
6 int user_write_lock(unsigned int id1, unsigned int id2);
7 int user_write_unlock(unsigned int id1, unsigned int id2);
8 int user_write_lock_oid(Oid oid);
9 int user_write_unlock_oid(Oid oid);
10 int user_unlock_all(void);