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/*-------------------------------------------------------------------------
*
* psort.h--
*
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: psort.h,v 1.12 1997/09/18 05:42:01 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PSORT_H
#define PSORT_H
#include <stdio.h>
#include "access/relscan.h"
#include "utils/lselect.h"
#include "nodes/plannodes.h"
#define MAXTAPES 7 /* 7--See Fig. 70, p273 */
#define TAPEEXTLEN strlen("pg_psort.xxxxx.xxx") /* TEMPDIR/TAPEEXT */
#define FREE(x) pfree((char *) x)
struct tape
{
int tp_dummy; /* (D) */
int tp_fib; /* (A) */
FILE *tp_file; /* (TAPE) */
struct tape *tp_prev;
};
struct cmplist
{
int cp_attn; /* attribute number */
int cp_num; /* comparison function code */
int cp_rev; /* invert comparison flag */
struct cmplist *cp_next; /* next in chain */
};
/* This structure preserves the state of psort between calls from different
* nodes to its interface functions. Basically, it includes all of the global
* variables in psort. In case you were wondering, pointers to these structures
* are included in Sort node structures. -Rex 2.6.1995
*/
typedef struct Psortstate
{
LeftistContextData treeContext;
int TapeRange;
int Level;
int TotalDummy;
struct tape Tape[MAXTAPES];
int BytesRead;
int BytesWritten;
int tupcount;
struct leftist *Tuples;
int lt_tupcount;
HeapTuple lasttuple;
FILE *psort_grab_file;
long psort_current; /* could be file offset, or array index */
long psort_saved; /* could be file offset, or array index */
bool using_tape_files;
HeapTuple *memtuples;
} Psortstate;
#ifdef EBUG
#include <stdio.h>
#include "utils/elog.h"
#include "storage/buf.h"
#include "storage/bufmgr.h"
#define PDEBUG(PROC, S1)\
elog(DEBUG, "%s:%d>> PROC: %s.", __FILE__, __LINE__, S1)
#define PDEBUG2(PROC, S1, D1)\
elog(DEBUG, "%s:%d>> PROC: %s %d.", __FILE__, __LINE__, S1, D1)
#define PDEBUG4(PROC, S1, D1, S2, D2)\
elog(DEBUG, "%s:%d>> PROC: %s %d, %s %d.", __FILE__, __LINE__, S1, D1, S2, D2)
#define VDEBUG(VAR, FMT)\
elog(DEBUG, "%s:%d>> VAR =FMT", __FILE__, __LINE__, VAR)
#define ASSERT(EXPR, STR)\
if (!(EXPR)) elog(FATAL, "%s:%d>> %s", __FILE__, __LINE__, STR)
#define TRACE(VAL, CODE)\
if (1) CODE; else
#else
#define PDEBUG(MSG)
#define VDEBUG(VAR, FMT)
#define ASSERT(EXPR, MSG)
#define TRACE(VAL, CODE)
#endif
/* psort.c */
extern bool psort_begin(Sort *node, int nkeys, ScanKey key);
extern HeapTuple psort_grabtuple(Sort *node, bool *should_free);
extern void psort_markpos(Sort *node);
extern void psort_restorepos(Sort *node);
extern void psort_end(Sort *node);
#endif /* PSORT_H */
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