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postgres/contrib/userlock/user_locks.h

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#ifndef USER_LOCKS_H
#define USER_LOCKS_H
extern int user_lock(uint32 id1, uint32 id2, LOCKMODE lockmode);
extern int user_unlock(uint32 id1, uint32 id2, LOCKMODE lockmode);
extern int user_write_lock(uint32 id1, uint32 id2);
extern int user_write_unlock(uint32 id1, uint32 id2);
extern int user_write_lock_oid(Oid oid);
extern int user_write_unlock_oid(Oid oid);
extern int user_unlock_all(void);
#endif