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postgres/src/include/storage/lmgr.h

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More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
/*-------------------------------------------------------------------------
*
Change my-function-name-- to my_function_name, and optimizer renames.
27 years ago
* lmgr.h
Massive commit to run PGINDENT on all *.c and *.h files.
28 years ago
* POSTGRES lock manager definitions.
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
*
*
Change Copyright from PostgreSQL, Inc to PostgreSQL Global Development Group.
25 years ago
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
Add: * Portions Copyright (c) 1996-2000, PostgreSQL, Inc to all files copyright Regents of Berkeley. Man, that's a lot of files.
26 years ago
* Portions Copyright (c) 1994, Regents of the University of California
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
*
More comment improvements.
25 years ago
* $Id: lmgr.h,v 1.29 2001/02/22 23:02:33 momjian Exp $
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
*
*-------------------------------------------------------------------------
*/
Massive commit to run PGINDENT on all *.c and *.h files.
28 years ago
#ifndef LMGR_H
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
#define LMGR_H
Change #include's to use <> and "" as appropriate.
27 years ago
#include "storage/lock.h"
#include "utils/rel.h"
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
Mega-commit to make heap_open/heap_openr/heap_close take an additional argument specifying the kind of lock to acquire/release (or 'NoLock' to do no lock processing). Ensure that all relations are locked with some appropriate lock level before being examined --- this ensures that relevant shared-inval messages have been processed and should prevent problems caused by concurrent VACUUM. Fix several bugs having to do with mismatched increment/decrement of relation ref count and mismatched heap_open/close (which amounts to the same thing). A bogus ref count on a relation doesn't matter much *unless* a SI Inval message happens to arrive at the wrong time, which is probably why we got away with this sloppiness for so long. Repair missing grab of AccessExclusiveLock in DROP TABLE, ALTER/RENAME TABLE, etc, as noted by Hiroshi. Recommend 'make clean all' after pulling this update; I modified the Relation struct layout slightly. Will post further discussion to pghackers list shortly.
26 years ago
/* These are the valid values of type LOCKMODE: */
/* NoLock is not a lock mode, but a flag value meaning "don't get a lock" */
#define NoLock 0
Initial MVCC code. New code for locking buffer' context.
27 years ago
#define AccessShareLock 1 /* SELECT */
#define RowShareLock 2 /* SELECT FOR UPDATE */
#define RowExclusiveLock 3 /* INSERT, UPDATE, DELETE */
More comment improvements.
25 years ago
#define ShareLock 4 /* CREATE INDEX */
#define ShareRowExclusiveLock 5 /* like EXCLUSIVE MODE, allows SHARE ROW */
#define ExclusiveLock 6 /* blocks ROW SHARE/SELECT...FOR UPDATE */
#define AccessExclusiveLock 7 /* ALTER TABLE, DROP TABLE, VACUUM, and
* unqualified LOCK TABLE
*/
Initial MVCC code. New code for locking buffer' context.
27 years ago
extern LOCKMETHOD LockTableId;
Revise lock manager to support "session level" locks as well as "transaction level" locks. A session lock is not released at transaction commit (but it is released on transaction abort, to ensure recovery after an elog(ERROR)). In VACUUM, use a session lock to protect the master table while vacuuming a TOAST table, so that the TOAST table can be done in an independent transaction. I also took this opportunity to do some cleanup and renaming in the lock code. The previously noted bug in ProcLockWakeup, that it couldn't wake up any waiters beyond the first non-wakeable waiter, is now fixed. Also found a previously unknown bug of the same kind (failure to scan all members of a lock queue in some cases) in DeadLockCheck. This might have led to failure to detect a deadlock condition, resulting in indefinite waits, but it's difficult to characterize the conditions required to trigger a failure.
25 years ago
extern LOCKMETHOD InitLockTable(int maxBackends);
Another PGINDENT run that changes variable indenting and case label indenting. Also static variable indenting.
28 years ago
extern void RelationInitLockInfo(Relation relation);
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
Revise lock manager to support "session level" locks as well as "transaction level" locks. A session lock is not released at transaction commit (but it is released on transaction abort, to ensure recovery after an elog(ERROR)). In VACUUM, use a session lock to protect the master table while vacuuming a TOAST table, so that the TOAST table can be done in an independent transaction. I also took this opportunity to do some cleanup and renaming in the lock code. The previously noted bug in ProcLockWakeup, that it couldn't wake up any waiters beyond the first non-wakeable waiter, is now fixed. Also found a previously unknown bug of the same kind (failure to scan all members of a lock queue in some cases) in DeadLockCheck. This might have led to failure to detect a deadlock condition, resulting in indefinite waits, but it's difficult to characterize the conditions required to trigger a failure.
25 years ago
/* Lock a relation */
Initial MVCC code. New code for locking buffer' context.
27 years ago
extern void LockRelation(Relation relation, LOCKMODE lockmode);
extern void UnlockRelation(Relation relation, LOCKMODE lockmode);
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
Revise lock manager to support "session level" locks as well as "transaction level" locks. A session lock is not released at transaction commit (but it is released on transaction abort, to ensure recovery after an elog(ERROR)). In VACUUM, use a session lock to protect the master table while vacuuming a TOAST table, so that the TOAST table can be done in an independent transaction. I also took this opportunity to do some cleanup and renaming in the lock code. The previously noted bug in ProcLockWakeup, that it couldn't wake up any waiters beyond the first non-wakeable waiter, is now fixed. Also found a previously unknown bug of the same kind (failure to scan all members of a lock queue in some cases) in DeadLockCheck. This might have led to failure to detect a deadlock condition, resulting in indefinite waits, but it's difficult to characterize the conditions required to trigger a failure.
25 years ago
extern void LockRelationForSession(LockRelId *relid, LOCKMODE lockmode);
extern void UnlockRelationForSession(LockRelId *relid, LOCKMODE lockmode);
/* Lock a page (mainly used for indices) */
Initial MVCC code. New code for locking buffer' context.
27 years ago
extern void LockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
extern void UnlockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
Revise lock manager to support "session level" locks as well as "transaction level" locks. A session lock is not released at transaction commit (but it is released on transaction abort, to ensure recovery after an elog(ERROR)). In VACUUM, use a session lock to protect the master table while vacuuming a TOAST table, so that the TOAST table can be done in an independent transaction. I also took this opportunity to do some cleanup and renaming in the lock code. The previously noted bug in ProcLockWakeup, that it couldn't wake up any waiters beyond the first non-wakeable waiter, is now fixed. Also found a previously unknown bug of the same kind (failure to scan all members of a lock queue in some cases) in DeadLockCheck. This might have led to failure to detect a deadlock condition, resulting in indefinite waits, but it's difficult to characterize the conditions required to trigger a failure.
25 years ago
/* Lock an XID (used to wait for a transaction to finish) */
Initial MVCC code. New code for locking buffer' context.
27 years ago
extern void XactLockTableInsert(TransactionId xid);
extern void XactLockTableWait(TransactionId xid);
More cleanups of the include files - centralizing to simplify the -I's required to compile
29 years ago
OK, folks, here is the pgindent output.
27 years ago
#endif /* LMGR_H */