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Diffstat (limited to 'src/include/access/heapam.h')
| -rw-r--r-- | src/include/access/heapam.h | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h new file mode 100644 index 0000000..f279edc --- /dev/null +++ b/src/include/access/heapam.h @@ -0,0 +1,223 @@ +/*------------------------------------------------------------------------- + * + * heapam.h + * POSTGRES heap access method definitions. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/include/access/heapam.h + * + *------------------------------------------------------------------------- + */ +#ifndef HEAPAM_H +#define HEAPAM_H + +#include "access/relation.h" /* for backward compatibility */ +#include "access/relscan.h" +#include "access/sdir.h" +#include "access/skey.h" +#include "access/table.h" /* for backward compatibility */ +#include "access/tableam.h" +#include "nodes/lockoptions.h" +#include "nodes/primnodes.h" +#include "storage/bufpage.h" +#include "storage/dsm.h" +#include "storage/lockdefs.h" +#include "storage/shm_toc.h" +#include "utils/relcache.h" +#include "utils/snapshot.h" + + +/* "options" flag bits for heap_insert */ +#define HEAP_INSERT_SKIP_FSM TABLE_INSERT_SKIP_FSM +#define HEAP_INSERT_FROZEN TABLE_INSERT_FROZEN +#define HEAP_INSERT_NO_LOGICAL TABLE_INSERT_NO_LOGICAL +#define HEAP_INSERT_SPECULATIVE 0x0010 + +typedef struct BulkInsertStateData *BulkInsertState; +struct TupleTableSlot; + +#define MaxLockTupleMode LockTupleExclusive + +/* + * Descriptor for heap table scans. + */ +typedef struct HeapScanDescData +{ + TableScanDescData rs_base; /* AM independent part of the descriptor */ + + /* state set up at initscan time */ + BlockNumber rs_nblocks; /* total number of blocks in rel */ + BlockNumber rs_startblock; /* block # to start at */ + BlockNumber rs_numblocks; /* max number of blocks to scan */ + /* rs_numblocks is usually InvalidBlockNumber, meaning "scan whole rel" */ + + /* scan current state */ + bool rs_inited; /* false = scan not init'd yet */ + BlockNumber rs_cblock; /* current block # in scan, if any */ + Buffer rs_cbuf; /* current buffer in scan, if any */ + /* NB: if rs_cbuf is not InvalidBuffer, we hold a pin on that buffer */ + + /* rs_numblocks is usually InvalidBlockNumber, meaning "scan whole rel" */ + BufferAccessStrategy rs_strategy; /* access strategy for reads */ + + HeapTupleData rs_ctup; /* current tuple in scan, if any */ + + /* these fields only used in page-at-a-time mode and for bitmap scans */ + int rs_cindex; /* current tuple's index in vistuples */ + int rs_ntuples; /* number of visible tuples on page */ + OffsetNumber rs_vistuples[MaxHeapTuplesPerPage]; /* their offsets */ +} HeapScanDescData; +typedef struct HeapScanDescData *HeapScanDesc; + +/* + * Descriptor for fetches from heap via an index. + */ +typedef struct IndexFetchHeapData +{ + IndexFetchTableData xs_base; /* AM independent part of the descriptor */ + + Buffer xs_cbuf; /* current heap buffer in scan, if any */ + /* NB: if xs_cbuf is not InvalidBuffer, we hold a pin on that buffer */ +} IndexFetchHeapData; + +/* Result codes for HeapTupleSatisfiesVacuum */ +typedef enum +{ + HEAPTUPLE_DEAD, /* tuple is dead and deletable */ + HEAPTUPLE_LIVE, /* tuple is live (committed, no deleter) */ + HEAPTUPLE_RECENTLY_DEAD, /* tuple is dead, but not deletable yet */ + HEAPTUPLE_INSERT_IN_PROGRESS, /* inserting xact is still in progress */ + HEAPTUPLE_DELETE_IN_PROGRESS /* deleting xact is still in progress */ +} HTSV_Result; + +/* ---------------- + * function prototypes for heap access method + * + * heap_create, heap_create_with_catalog, and heap_drop_with_catalog + * are declared in catalog/heap.h + * ---------------- + */ + + +/* + * HeapScanIsValid + * True iff the heap scan is valid. + */ +#define HeapScanIsValid(scan) PointerIsValid(scan) + +extern TableScanDesc heap_beginscan(Relation relation, Snapshot snapshot, + int nkeys, ScanKey key, + ParallelTableScanDesc parallel_scan, + uint32 flags); +extern void heap_setscanlimits(TableScanDesc scan, BlockNumber startBlk, + BlockNumber numBlks); +extern void heapgetpage(TableScanDesc scan, BlockNumber page); +extern void heap_rescan(TableScanDesc scan, ScanKey key, bool set_params, + bool allow_strat, bool allow_sync, bool allow_pagemode); +extern void heap_endscan(TableScanDesc scan); +extern HeapTuple heap_getnext(TableScanDesc scan, ScanDirection direction); +extern bool heap_getnextslot(TableScanDesc sscan, + ScanDirection direction, struct TupleTableSlot *slot); + +extern bool heap_fetch(Relation relation, Snapshot snapshot, + HeapTuple tuple, Buffer *userbuf); +extern bool heap_hot_search_buffer(ItemPointer tid, Relation relation, + Buffer buffer, Snapshot snapshot, HeapTuple heapTuple, + bool *all_dead, bool first_call); + +extern void heap_get_latest_tid(TableScanDesc scan, ItemPointer tid); +extern void setLastTid(const ItemPointer tid); + +extern BulkInsertState GetBulkInsertState(void); +extern void FreeBulkInsertState(BulkInsertState); +extern void ReleaseBulkInsertStatePin(BulkInsertState bistate); + +extern void heap_insert(Relation relation, HeapTuple tup, CommandId cid, + int options, BulkInsertState bistate); +extern void heap_multi_insert(Relation relation, struct TupleTableSlot **slots, + int ntuples, CommandId cid, int options, + BulkInsertState bistate); +extern TM_Result heap_delete(Relation relation, ItemPointer tid, + CommandId cid, Snapshot crosscheck, bool wait, + struct TM_FailureData *tmfd, bool changingPart); +extern void heap_finish_speculative(Relation relation, ItemPointer tid); +extern void heap_abort_speculative(Relation relation, ItemPointer tid); +extern TM_Result heap_update(Relation relation, ItemPointer otid, + HeapTuple newtup, + CommandId cid, Snapshot crosscheck, bool wait, + struct TM_FailureData *tmfd, LockTupleMode *lockmode); +extern TM_Result heap_lock_tuple(Relation relation, HeapTuple tuple, + CommandId cid, LockTupleMode mode, LockWaitPolicy wait_policy, + bool follow_update, + Buffer *buffer, struct TM_FailureData *tmfd); + +extern void heap_inplace_update(Relation relation, HeapTuple tuple); +extern bool heap_freeze_tuple(HeapTupleHeader tuple, + TransactionId relfrozenxid, TransactionId relminmxid, + TransactionId cutoff_xid, TransactionId cutoff_multi); +extern bool heap_tuple_needs_freeze(HeapTupleHeader tuple, TransactionId cutoff_xid, + MultiXactId cutoff_multi, Buffer buf); +extern bool heap_tuple_needs_eventual_freeze(HeapTupleHeader tuple); + +extern void simple_heap_insert(Relation relation, HeapTuple tup); +extern void simple_heap_delete(Relation relation, ItemPointer tid); +extern void simple_heap_update(Relation relation, ItemPointer otid, + HeapTuple tup); + +extern TransactionId heap_compute_xid_horizon_for_tuples(Relation rel, + ItemPointerData *items, + int nitems); + +/* in heap/pruneheap.c */ +extern void heap_page_prune_opt(Relation relation, Buffer buffer); +extern int heap_page_prune(Relation relation, Buffer buffer, + TransactionId OldestXmin, + bool report_stats, TransactionId *latestRemovedXid); +extern void heap_page_prune_execute(Buffer buffer, + OffsetNumber *redirected, int nredirected, + OffsetNumber *nowdead, int ndead, + OffsetNumber *nowunused, int nunused); +extern void heap_get_root_tuples(Page page, OffsetNumber *root_offsets); + +/* in heap/syncscan.c */ +extern void ss_report_location(Relation rel, BlockNumber location); +extern BlockNumber ss_get_location(Relation rel, BlockNumber relnblocks); +extern void SyncScanShmemInit(void); +extern Size SyncScanShmemSize(void); + +/* in heap/vacuumlazy.c */ +struct VacuumParams; +extern void heap_vacuum_rel(Relation onerel, + struct VacuumParams *params, BufferAccessStrategy bstrategy); +extern void parallel_vacuum_main(dsm_segment *seg, shm_toc *toc); + +/* in heap/heapam_visibility.c */ +extern bool HeapTupleSatisfiesVisibility(HeapTuple stup, Snapshot snapshot, + Buffer buffer); +extern TM_Result HeapTupleSatisfiesUpdate(HeapTuple stup, CommandId curcid, + Buffer buffer); +extern HTSV_Result HeapTupleSatisfiesVacuum(HeapTuple stup, TransactionId OldestXmin, + Buffer buffer); +extern void HeapTupleSetHintBits(HeapTupleHeader tuple, Buffer buffer, + uint16 infomask, TransactionId xid); +extern bool HeapTupleHeaderIsOnlyLocked(HeapTupleHeader tuple); +extern bool XidInMVCCSnapshot(TransactionId xid, Snapshot snapshot); +extern bool HeapTupleIsSurelyDead(HeapTuple htup, TransactionId OldestXmin); + +/* + * To avoid leaking too much knowledge about reorderbuffer implementation + * details this is implemented in reorderbuffer.c not heapam_visibility.c + */ +struct HTAB; +extern bool ResolveCminCmaxDuringDecoding(struct HTAB *tuplecid_data, + Snapshot snapshot, + HeapTuple htup, + Buffer buffer, + CommandId *cmin, CommandId *cmax); +extern void HeapCheckForSerializableConflictOut(bool valid, Relation relation, HeapTuple tuple, + Buffer buffer, Snapshot snapshot); + +#endif /* HEAPAM_H */ |