From e0c9301c87634f21c0a7c6305bdc6da15d6ba375 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Wed, 27 Jun 2001 23:31:40 +0000
Subject: Install infrastructure for shared-memory free space map.  Doesn't
 actually do anything yet, but it has the necessary connections to
 initialization and so forth.  Make some gestures towards allowing number of
 blocks in a relation to be BlockNumber, ie, unsigned int, rather than signed
 int. (I doubt I got all the places that are sloppy about it, yet.)  On the
 way, replace the hardwired NLOCKS_PER_XACT fudge factor with a GUC variable.

---
 src/include/storage/freespace.h | 53 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/include/storage/freespace.h

(limited to 'src/include/storage/freespace.h')

diff --git a/src/include/storage/freespace.h b/src/include/storage/freespace.h
new file mode 100644
index 00000000000..083accccab8
--- /dev/null
+++ b/src/include/storage/freespace.h
@@ -0,0 +1,53 @@
+/*-------------------------------------------------------------------------
+ *
+ * freespace.h
+ *	  POSTGRES free space map for quickly finding free space in relations
+ *
+ *
+ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: freespace.h,v 1.1 2001/06/27 23:31:39 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef FREESPACE_H_
+#define FREESPACE_H_
+
+#include "storage/block.h"
+#include "storage/relfilenode.h"
+#include "storage/spin.h"
+
+
+extern SPINLOCK FreeSpaceLock;
+
+extern int	MaxFSMRelations;
+extern int	MaxFSMPages;
+
+
+/*
+ * function prototypes
+ */
+extern void InitFreeSpaceMap(void);
+extern int	FreeSpaceShmemSize(void);
+
+extern BlockNumber GetPageWithFreeSpace(RelFileNode *rel, Size spaceNeeded);
+extern void RecordFreeSpace(RelFileNode *rel, BlockNumber page,
+							Size spaceAvail);
+extern BlockNumber RecordAndGetPageWithFreeSpace(RelFileNode *rel,
+												 BlockNumber oldPage,
+												 Size oldSpaceAvail,
+												 Size spaceNeeded);
+extern void MultiRecordFreeSpace(RelFileNode *rel,
+								 BlockNumber minPage,
+								 BlockNumber maxPage,
+								 int nPages,
+								 BlockNumber *pages,
+								 Size *spaceAvail);
+extern void FreeSpaceMapForgetRel(RelFileNode *rel);
+
+#ifdef FREESPACE_DEBUG
+extern void DumpFreeSpace(void);
+#endif
+
+#endif	 /* FREESPACE_H */
-- 
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