60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* lockdefs.h
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* Frontend exposed parts of postgres' low level lock mechanism
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*
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* The split between lockdefs.h and lock.h is not very principled. This file
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* contains definition that have to (indirectly) be available when included by
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* FRONTEND code.
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/storage/lockdefs.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LOCKDEFS_H_
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#define LOCKDEFS_H_
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/*
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* LOCKMODE is an integer (1..N) indicating a lock type. LOCKMASK is a bit
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* mask indicating a set of held or requested lock types (the bit 1<<mode
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* corresponds to a particular lock mode).
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*/
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typedef int LOCKMASK;
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typedef int LOCKMODE;
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/*
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* These are the valid values of type LOCKMODE for all the standard lock
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* methods (both DEFAULT and USER).
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*/
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/* NoLock is not a lock mode, but a flag value meaning "don't get a lock" */
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#define NoLock 0
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#define AccessShareLock 1 /* SELECT */
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#define RowShareLock 2 /* SELECT FOR UPDATE/FOR SHARE */
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#define RowExclusiveLock 3 /* INSERT, UPDATE, DELETE */
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#define ShareUpdateExclusiveLock 4 /* VACUUM (non-FULL), ANALYZE, CREATE
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* INDEX CONCURRENTLY */
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#define ShareLock 5 /* CREATE INDEX (WITHOUT CONCURRENTLY) */
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#define ShareRowExclusiveLock 6 /* like EXCLUSIVE MODE, but allows ROW
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* SHARE */
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#define ExclusiveLock 7 /* blocks ROW SHARE/SELECT...FOR UPDATE */
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#define AccessExclusiveLock 8 /* ALTER TABLE, DROP TABLE, VACUUM FULL,
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* and unqualified LOCK TABLE */
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#define MaxLockMode 8 /* highest standard lock mode */
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/* WAL representation of an AccessExclusiveLock on a table */
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typedef struct xl_standby_lock
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{
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TransactionId xid; /* xid of holder of AccessExclusiveLock */
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Oid dbOid; /* DB containing table */
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Oid relOid; /* OID of table */
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} xl_standby_lock;
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#endif /* LOCKDEFS_H_ */
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