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/*-------------------------------------------------------------------------
*
* visibilitymap.h
* visibility map interface
*
*
* Portions Copyright (c) 2007-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/visibilitymap.h
*
*-------------------------------------------------------------------------
*/
#ifndef VISIBILITYMAP_H
#define VISIBILITYMAP_H
#include "access/xlogdefs.h"
#include "storage/block.h"
#include "storage/buf.h"
#include "utils/relcache.h"
/* Number of bits for one heap page */
#define BITS_PER_HEAPBLOCK 2
/* Flags for bit map */
#define VISIBILITYMAP_ALL_VISIBLE 0x01
#define VISIBILITYMAP_ALL_FROZEN 0x02
#define VISIBILITYMAP_VALID_BITS 0x03 /* OR of all valid
* visiblitymap flags bits */
/* Macros for visibilitymap test */
#define VM_ALL_VISIBLE(r, b, v) \
((visibilitymap_get_status((r), (b), (v)) & VISIBILITYMAP_ALL_VISIBLE) != 0)
#define VM_ALL_FROZEN(r, b, v) \
((visibilitymap_get_status((r), (b), (v)) & VISIBILITYMAP_ALL_FROZEN) != 0)
extern void visibilitymap_clear(Relation rel, BlockNumber heapBlk,
Buffer vmbuf);
extern void visibilitymap_pin(Relation rel, BlockNumber heapBlk,
Buffer *vmbuf);
extern bool visibilitymap_pin_ok(BlockNumber heapBlk, Buffer vmbuf);
extern void visibilitymap_set(Relation rel, BlockNumber heapBlk, Buffer heapBuf,
XLogRecPtr recptr, Buffer vmBuf, TransactionId cutoff_xid,
uint8 flags);
extern uint8 visibilitymap_get_status(Relation rel, BlockNumber heapBlk, Buffer *vmbuf);
extern void visibilitymap_count(Relation rel, BlockNumber *all_visible, BlockNumber *all_frozen);
extern void visibilitymap_truncate(Relation rel, BlockNumber nheapblocks);
#endif /* VISIBILITYMAP_H */
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