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/*-------------------------------------------------------------------------
*
* lselect.h
* definitions for the replacement selection algorithm.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: lselect.h,v 1.14 1999/07/17 20:18:36 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LSELECT_H
#define LSELECT_H
#include "utils/syscache.h"
struct leftist
{
short lt_dist; /* distance to leaf/empty node */
short lt_devnum; /* device number of tuple */
HeapTuple lt_tuple;
struct leftist *lt_left;
struct leftist *lt_right;
};
/* replaces global variables in lselect.c to make it reentrant */
typedef struct
{
TupleDesc tupDesc;
int nKeys;
ScanKey scanKeys;
int sortMem; /* needed for psort */
} LeftistContextData;
typedef LeftistContextData *LeftistContext;
extern struct leftist *lmerge(struct leftist * pt, struct leftist * qt,
LeftistContext context);
extern HeapTuple gettuple(struct leftist ** treep, short *devnum,
LeftistContext context);
extern void puttuple(struct leftist ** treep, HeapTuple newtuple, short devnum,
LeftistContext context);
extern int tuplecmp(HeapTuple ltup, HeapTuple rtup, LeftistContext context);
#ifdef EBUG
extern void checktree(struct leftist * tree, LeftistContext context);
extern int checktreer(struct leftist * tree, int level, LeftistContext context);
#endif /* EBUG */
#endif /* LSELECT_H */
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