1 files changed, 50 insertions, 0 deletions
diff --git a/src/include/access/visibilitymap.h b/src/include/access/visibilitymap.h
new file mode 100644
index 0000000..b462e90
--- /dev/null
+++ b/src/include/access/visibilitymap.h
@@ -0,0 +1,50 @@
+/*-------------------------------------------------------------------------
+ *
+ * visibilitymap.h
+ *		visibility map interface
+ *
+ *
+ * Portions Copyright (c) 2007-2020, 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 visibilitymap
+											 * 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 bool visibilitymap_clear(Relation rel, BlockNumber heapBlk,
+								Buffer vmbuf, uint8 flags);
+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 BlockNumber visibilitymap_prepare_truncate(Relation rel,
+												  BlockNumber nheapblocks);
+
+#endif							/* VISIBILITYMAP_H */