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2589735da0
buffer manager with 'pg_clog', a specialized access method modeled on pg_xlog. This simplifies startup (don't need to play games to open pg_log; among other things, OverrideTransactionSystem goes away), should improve performance a little, and opens the door to recycling commit log space by removing no-longer-needed segments of the commit log. Actual recycling is not there yet, but I felt I should commit this part separately since it'd still be useful if we chose not to do transaction ID wraparound.
29 lines
856 B
C
29 lines
856 B
C
/*
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* xlogutils.h
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*
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* PostgreSQL transaction log manager utility routines
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: xlogutils.h,v 1.8 2001/08/25 18:52:42 tgl Exp $
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*/
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#ifndef XLOG_UTILS_H
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#define XLOG_UTILS_H
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#include "access/rmgr.h"
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#include "storage/buf.h"
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#include "storage/itemptr.h"
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#include "utils/rel.h"
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extern int XLogIsOwnerOfTuple(RelFileNode hnode, ItemPointer iptr,
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TransactionId xid, CommandId cid);
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extern bool XLogIsValidTuple(RelFileNode hnode, ItemPointer iptr);
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extern void XLogInitRelationCache(void);
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extern void XLogCloseRelationCache(void);
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extern Relation XLogOpenRelation(bool redo, RmgrId rmid, RelFileNode rnode);
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extern Buffer XLogReadBuffer(bool extend, Relation reln, BlockNumber blkno);
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#endif
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