/*-------------------------------------------------------------------------
 *
 * instrument.h
 *	  definitions for run-time statistics collection
 *
 *
 * Copyright (c) 2001-2009, PostgreSQL Global Development Group
 *
 * $PostgreSQL: pgsql/src/include/executor/instrument.h,v 1.20 2009/01/01 17:23:59 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef INSTRUMENT_H
#define INSTRUMENT_H

#include "portability/instr_time.h"


typedef struct Instrumentation
{
	/* Info about current plan cycle: */
	bool		running;		/* TRUE if we've completed first tuple */
	instr_time	starttime;		/* Start time of current iteration of node */
	instr_time	counter;		/* Accumulated runtime for this node */
	double		firsttuple;		/* Time for first tuple of this cycle */
	double		tuplecount;		/* Tuples emitted so far this cycle */
	/* Accumulated statistics across all completed cycles: */
	double		startup;		/* Total startup time (in seconds) */
	double		total;			/* Total total time (in seconds) */
	double		ntuples;		/* Total tuples produced */
	double		nloops;			/* # of run cycles for this node */
} Instrumentation;

extern Instrumentation *InstrAlloc(int n);
extern void InstrStartNode(Instrumentation *instr);
extern void InstrStopNode(Instrumentation *instr, double nTuples);
extern void InstrEndLoop(Instrumentation *instr);

#endif   /* INSTRUMENT_H */