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113 lines
3.5 KiB
113 lines
3.5 KiB
29 years ago
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/*-------------------------------------------------------------------------
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*
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* bufmgr.h--
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* POSTGRES buffer manager definitions.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: bufmgr.h,v 1.1 1996/08/28 01:58:01 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef BUFMGR_H
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#define BUFMGR_H
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#include "c.h"
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#include "machine.h" /* for BLCKSZ */
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#include "utils/rel.h"
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#include "storage/buf_internals.h" /* UGLY! -- ay */
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/*
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* the maximum size of a disk block for any possible installation.
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*
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* in theory this could be anything, but in practice this is actually
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* limited to 2^13 bytes because we have limited ItemIdData.lp_off and
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* ItemIdData.lp_len to 13 bits (see itemid.h).
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*/
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#define MAXBLCKSZ 8192
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typedef void *Block;
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/* special pageno for bget */
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#define P_NEW InvalidBlockNumber /* grow the file to get a new page */
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typedef bits16 BufferLock;
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/**********************************************************************
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the rest is function defns in the bufmgr that are externally callable
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**********************************************************************/
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/*
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* These routines are beaten on quite heavily, hence the macroization.
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* See buf_internals.h for a related comment.
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*/
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#define BufferDescriptorGetBuffer(bdesc) ((bdesc)->buf_id + 1)
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/*
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* BufferIsPinned --
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* True iff the buffer is pinned (and therefore valid)
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*
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* Note:
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* Smenatics are identical to BufferIsValid
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* XXX - need to remove either one eventually.
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*/
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#define BufferIsPinned BufferIsValid
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extern int ShowPinTrace;
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/*
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* prototypes for functions in bufmgr.c
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*/
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extern Buffer RelationGetBufferWithBuffer(Relation relation,
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BlockNumber blockNumber, Buffer buffer);
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extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
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extern Buffer ReadBuffer_Debug(char *file, int line, Relation reln,
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BlockNumber blockNum);
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extern int WriteBuffer(Buffer buffer);
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extern void WriteBuffer_Debug(char *file, int line, Buffer buffer);
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extern void DirtyBufferCopy(Oid dbid, Oid relid, BlockNumber blkno,
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char *dest);
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extern int WriteNoReleaseBuffer(Buffer buffer);
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extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
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BlockNumber blockNum);
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extern void InitBufferPool(IPCKey key);
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extern void PrintBufferUsage(FILE *statfp);
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extern void ResetBufferUsage(void);
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extern void ResetBufferPool(void);
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extern int BufferPoolCheckLeak(void);
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extern void FlushBufferPool(int StableMainMemoryFlag);
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extern bool BufferIsValid(Buffer bufnum);
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extern BlockNumber BufferGetBlockNumber(Buffer buffer);
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extern Relation BufferGetRelation(Buffer buffer);
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extern BlockNumber RelationGetNumberOfBlocks(Relation relation);
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extern Block BufferGetBlock(Buffer buffer);
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extern void ReleaseTmpRelBuffers(Relation tempreldesc);
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extern void DropBuffers(Oid dbid);
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extern void PrintBufferDescs(void);
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extern void PrintPinnedBufs(void);
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extern int BufferShmemSize(void);
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extern void BufferPoolBlowaway(void);
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extern void IncrBufferRefCount(Buffer buffer);
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extern int ReleaseBuffer(Buffer buffer);
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extern void IncrBufferRefCount_Debug(char *file, int line, Buffer buffer);
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extern void ReleaseBuffer_Debug(char *file, int line, Buffer buffer);
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extern int ReleaseAndReadBuffer_Debug(char *file,
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int line,
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Buffer buffer,
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Relation relation,
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BlockNumber blockNum);
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extern void BufferRefCountReset(int *refcountsave);
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extern void BufferRefCountRestore(int *refcountsave);
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#endif /* !defined(BufMgrIncluded) */
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