1 files changed, 112 insertions, 0 deletions
diff --git a/src/backend/storage/bufmgr.h b/src/backend/storage/bufmgr.h
new file mode 100644
index 00000000000..581d3237cad
--- /dev/null
+++ b/src/backend/storage/bufmgr.h
@@ -0,0 +1,112 @@
+/*-------------------------------------------------------------------------
+ *
+ * bufmgr.h--
+ *    POSTGRES buffer manager definitions.
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: bufmgr.h,v 1.1.1.1 1996/07/09 06:21:52 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	BUFMGR_H
+#define BUFMGR_H
+
+#include "c.h"
+
+#include "machine.h"		/* for BLCKSZ */
+#include "utils/rel.h"
+
+#include "storage/buf_internals.h"	/* UGLY! -- ay */
+
+/*
+ * the maximum size of a disk block for any possible installation.
+ *
+ * in theory this could be anything, but in practice this is actually
+ * limited to 2^13 bytes because we have limited ItemIdData.lp_off and
+ * ItemIdData.lp_len to 13 bits (see itemid.h).
+ */
+#define	MAXBLCKSZ	8192
+
+typedef void *Block;
+
+
+/* special pageno for bget */
+#define P_NEW	InvalidBlockNumber	/* grow the file to get a new page */
+
+typedef bits16	BufferLock;
+
+/**********************************************************************
+
+  the rest is function defns in the bufmgr that are externally callable
+
+ **********************************************************************/
+
+/*
+ * These routines are beaten on quite heavily, hence the macroization.
+ * See buf_internals.h for a related comment.
+ */
+#define BufferDescriptorGetBuffer(bdesc) ((bdesc)->buf_id + 1)
+
+/*
+ * BufferIsPinned --
+ *	True iff the buffer is pinned (and therefore valid)
+ *
+ * Note:
+ *	Smenatics are identical to BufferIsValid 
+ *      XXX - need to remove either one eventually.
+ */
+#define BufferIsPinned BufferIsValid
+
+
+extern int ShowPinTrace;
+
+/*
+ * prototypes for functions in bufmgr.c 
+ */
+extern Buffer RelationGetBufferWithBuffer(Relation relation,
+		  BlockNumber blockNumber, Buffer buffer);
+extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
+extern Buffer ReadBuffer_Debug(char *file, int line, Relation reln,
+			       BlockNumber blockNum);
+extern int WriteBuffer(Buffer buffer);
+extern void WriteBuffer_Debug(char *file, int line, Buffer buffer);
+extern void DirtyBufferCopy(Oid dbid, Oid relid, BlockNumber blkno,
+			    char *dest);
+extern int WriteNoReleaseBuffer(Buffer buffer);
+extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
+				   BlockNumber blockNum);
+
+extern void InitBufferPool(IPCKey key);
+extern void PrintBufferUsage(FILE *statfp);
+extern void ResetBufferUsage(void);
+extern void ResetBufferPool(void);
+extern int BufferPoolCheckLeak(void);
+extern void FlushBufferPool(int StableMainMemoryFlag);
+extern bool BufferIsValid(Buffer bufnum);
+extern BlockNumber BufferGetBlockNumber(Buffer buffer);
+extern Relation BufferGetRelation(Buffer buffer);
+extern BlockNumber RelationGetNumberOfBlocks(Relation relation);
+extern Block BufferGetBlock(Buffer buffer);
+extern void ReleaseTmpRelBuffers(Relation tempreldesc);
+extern void DropBuffers(Oid dbid);
+extern void PrintBufferDescs(void);
+extern void PrintPinnedBufs(void);
+extern int BufferShmemSize(void);
+extern void BufferPoolBlowaway(void);
+extern void IncrBufferRefCount(Buffer buffer);
+extern int ReleaseBuffer(Buffer buffer);
+
+extern void IncrBufferRefCount_Debug(char *file, int line, Buffer buffer);
+extern void ReleaseBuffer_Debug(char *file, int line, Buffer buffer);
+extern int ReleaseAndReadBuffer_Debug(char *file,
+				int line,
+				Buffer buffer,
+				Relation relation,
+				BlockNumber blockNum);
+extern void BufferRefCountReset(int *refcountsave);
+extern void BufferRefCountRestore(int *refcountsave);
+
+#endif	/* !defined(BufMgrIncluded) */
+