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visibilitymapdefs.h
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1/*-------------------------------------------------------------------------
2 *
3 * visibilitymapdefs.h
4 * macros for accessing contents of visibility map pages
5 *
6 *
7 * Copyright (c) 2021-2025, PostgreSQL Global Development Group
8 *
9 * src/include/access/visibilitymapdefs.h
10 *
11 *-------------------------------------------------------------------------
12 */
13#ifndef VISIBILITYMAPDEFS_H
14#define VISIBILITYMAPDEFS_H
15
16/* Number of bits for one heap page */
17#define BITS_PER_HEAPBLOCK 2
18
19/* Flags for bit map */
20#define VISIBILITYMAP_ALL_VISIBLE 0x01
21#define VISIBILITYMAP_ALL_FROZEN 0x02
22#define VISIBILITYMAP_VALID_BITS 0x03 /* OR of all valid visibilitymap
23 * flags bits */
24/*
25 * To detect recovery conflicts during logical decoding on a standby, we need
26 * to know if a table is a user catalog table. For that we add an additional
27 * bit into xl_heap_visible.flags, in addition to the above.
28 *
29 * NB: VISIBILITYMAP_XLOG_* may not be passed to visibilitymap_set().
30 */
31#define VISIBILITYMAP_XLOG_CATALOG_REL 0x04
32#define VISIBILITYMAP_XLOG_VALID_BITS (VISIBILITYMAP_VALID_BITS | VISIBILITYMAP_XLOG_CATALOG_REL)
33
34#endif /* VISIBILITYMAPDEFS_H */