granicus.if.org Git - postgresql/blob - src/include/access/visibilitymap.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * visibilitymap.h
   4  *              visibility map interface
   5  *
   6  *
   7  * Portions Copyright (c) 2007-2016, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * src/include/access/visibilitymap.h
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef VISIBILITYMAP_H
  15 #define VISIBILITYMAP_H
  16
  17 #include "access/xlogdefs.h"
  18 #include "storage/block.h"
  19 #include "storage/buf.h"
  20 #include "utils/relcache.h"
  21
  22 /* Number of bits for one heap page */
  23 #define BITS_PER_HEAPBLOCK 2
  24
  25 /* Flags for bit map */
  26 #define VISIBILITYMAP_ALL_VISIBLE       0x01
  27 #define VISIBILITYMAP_ALL_FROZEN        0x02
  28 #define VISIBILITYMAP_VALID_BITS        0x03            /* OR of all valid
  29                                                                                                  * visiblitymap flags bits */
  30
  31 /* Macros for visibilitymap test */
  32 #define VM_ALL_VISIBLE(r, b, v) \
  33         ((visibilitymap_get_status((r), (b), (v)) & VISIBILITYMAP_ALL_VISIBLE) != 0)
  34 #define VM_ALL_FROZEN(r, b, v) \
  35         ((visibilitymap_get_status((r), (b), (v)) & VISIBILITYMAP_ALL_FROZEN) != 0)
  36
  37 extern void visibilitymap_clear(Relation rel, BlockNumber heapBlk,
  38                                         Buffer vmbuf);
  39 extern void visibilitymap_pin(Relation rel, BlockNumber heapBlk,
  40                                   Buffer *vmbuf);
  41 extern bool visibilitymap_pin_ok(BlockNumber heapBlk, Buffer vmbuf);
  42 extern void visibilitymap_set(Relation rel, BlockNumber heapBlk, Buffer heapBuf,
  43                                   XLogRecPtr recptr, Buffer vmBuf, TransactionId cutoff_xid,
  44                                   uint8 flags);
  45 extern uint8 visibilitymap_get_status(Relation rel, BlockNumber heapBlk, Buffer *vmbuf);
  46 extern void visibilitymap_count(Relation rel, BlockNumber *all_visible, BlockNumber *all_frozen);
  47 extern void visibilitymap_truncate(Relation rel, BlockNumber nheapblocks);
  48
  49 #endif   /* VISIBILITYMAP_H */