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118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* lwlock.h
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* Lightweight lock manager
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*
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*
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* Portions Copyright (c) 1996-2011, 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/lwlock.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LWLOCK_H
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#define LWLOCK_H
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/*
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* It's a bit odd to declare NUM_BUFFER_PARTITIONS and NUM_LOCK_PARTITIONS
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* here, but we need them to set up enum LWLockId correctly, and having
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* this file include lock.h or bufmgr.h would be backwards.
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*/
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/* Number of partitions of the shared buffer mapping hashtable */
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#define NUM_BUFFER_PARTITIONS 16
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/* Number of partitions the shared lock tables are divided into */
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#define LOG2_NUM_LOCK_PARTITIONS 4
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#define NUM_LOCK_PARTITIONS (1 << LOG2_NUM_LOCK_PARTITIONS)
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/* Number of partitions the shared predicate lock tables are divided into */
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#define LOG2_NUM_PREDICATELOCK_PARTITIONS 4
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#define NUM_PREDICATELOCK_PARTITIONS (1 << LOG2_NUM_PREDICATELOCK_PARTITIONS)
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/*
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* We have a number of predefined LWLocks, plus a bunch of LWLocks that are
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* dynamically assigned (e.g., for shared buffers). The LWLock structures
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* live in shared memory (since they contain shared data) and are identified
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* by values of this enumerated type. We abuse the notion of an enum somewhat
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* by allowing values not listed in the enum declaration to be assigned.
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* The extra value MaxDynamicLWLock is there to keep the compiler from
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* deciding that the enum can be represented as char or short ...
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*
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* If you remove a lock, please replace it with a placeholder. This retains
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* the lock numbering, which is helpful for DTrace and other external
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* debugging scripts.
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*/
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typedef enum LWLockId
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{
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BufFreelistLock,
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ShmemIndexLock,
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OidGenLock,
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XidGenLock,
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ProcArrayLock,
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SInvalReadLock,
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SInvalWriteLock,
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WALInsertLock,
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WALWriteLock,
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ControlFileLock,
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CheckpointLock,
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CLogControlLock,
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SubtransControlLock,
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MultiXactGenLock,
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MultiXactOffsetControlLock,
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MultiXactMemberControlLock,
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RelCacheInitLock,
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BgWriterCommLock,
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TwoPhaseStateLock,
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TablespaceCreateLock,
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BtreeVacuumLock,
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AddinShmemInitLock,
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AutovacuumLock,
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AutovacuumScheduleLock,
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SyncScanLock,
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RelationMappingLock,
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AsyncCtlLock,
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AsyncQueueLock,
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SerializableXactHashLock,
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SerializableFinishedListLock,
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SerializablePredicateLockListLock,
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OldSerXidLock,
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SyncRepLock,
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/* Individual lock IDs end here */
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FirstBufMappingLock,
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FirstLockMgrLock = FirstBufMappingLock + NUM_BUFFER_PARTITIONS,
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FirstPredicateLockMgrLock = FirstLockMgrLock + NUM_LOCK_PARTITIONS,
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/* must be last except for MaxDynamicLWLock: */
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NumFixedLWLocks = FirstPredicateLockMgrLock + NUM_PREDICATELOCK_PARTITIONS,
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MaxDynamicLWLock = 1000000000
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} LWLockId;
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typedef enum LWLockMode
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{
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LW_EXCLUSIVE,
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LW_SHARED
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} LWLockMode;
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#ifdef LOCK_DEBUG
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extern bool Trace_lwlocks;
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#endif
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extern LWLockId LWLockAssign(void);
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extern void LWLockAcquire(LWLockId lockid, LWLockMode mode);
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extern bool LWLockConditionalAcquire(LWLockId lockid, LWLockMode mode);
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extern void LWLockRelease(LWLockId lockid);
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extern void LWLockReleaseAll(void);
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extern bool LWLockHeldByMe(LWLockId lockid);
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extern int NumLWLocks(void);
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extern Size LWLockShmemSize(void);
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extern void CreateLWLocks(void);
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extern void RequestAddinLWLocks(int n);
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#endif /* LWLOCK_H */
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