summaryrefslogtreecommitdiffstats
path: root/src/include/access/visibilitymapdefs.h
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/include/access/visibilitymapdefs.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/src/include/access/visibilitymapdefs.h b/src/include/access/visibilitymapdefs.h
new file mode 100644
index 0000000..2803ef5
--- /dev/null
+++ b/src/include/access/visibilitymapdefs.h
@@ -0,0 +1,25 @@
+/*-------------------------------------------------------------------------
+ *
+ * visibilitymapdefs.h
+ * macros for accessing contents of visibility map pages
+ *
+ *
+ * Copyright (c) 2021-2022, PostgreSQL Global Development Group
+ *
+ * src/include/access/visibilitymapdefs.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef VISIBILITYMAPDEFS_H
+#define VISIBILITYMAPDEFS_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 */
+
+#endif /* VISIBILITYMAPDEFS_H */