#ifndef h_perfdata
#define h_perfdata
/****************************************************************************
*
*	perfdata.h - UniVerse Performance Data
*
*	Module	%M%	Version	%I% 	Date	%H%
*
*	(c) Copyright 1998 Ardent Software Inc. - All Rights Reserved
*	This is unpublished proprietary source code of Ardent Software Inc.
*	The copyright notice above does not evidence any actual or intended
*	publication of such source code.
*
*******************************************************************************
*
*	Maintenence log - insert most recent change descriptions at top
*
*	Date.... GTAR# WHO Description.........................................
*	10/14/98 23801 SAP Change copyrights. 
*	04/25/97 20510 AGM Module created
*
******************************************************************************/

/******************************************************************************
 *
 * Any change to this file should also be reflected in:
 *
 *		WINNT/uvntperf.h
 *		WINNT/uvntperf.ini
 *		WINNT/uvntperf.c
 *
 ******************************************************************************/

/*
 * This file contains the definition of the perfromance data that
 * UniVerse can maintain if the UV_PERFORMANCE_DATA token is defined
 * in hardwareh.smp
 *
 * The structure that contains the actual data is added to the end of
 * the main disk shared memory segment when the token is defined and
 * various sections of the code set the counts as things change.
 *
 * Any UniVerse process can change the data in this structure. There is
 * no special semaphore used to maintain the integrity of the data
 * (I.e. prevent mutiple processes accessing it at the same time). This is
 * because we do not want to effect the performance of UniVerse by
 * requiring that semaphores be obtained in order to update the data.
 *
 * Instead of a performance semaphore we rely on the fact that some
 * other UniVerse concurrency semaphore will be held when the performance
 * data is changed. For example, data relating to the group locks will
 * only be changed when the group lock semaphore is held. The exception
 * to this is the user defined data items where there will be no concurency
 * control at all. BASIC programs should implement this themselves if they
 * want it.
 *
 * No concurrency control is used when reading this data. Each item is
 * a 'snapshot' at the point at which it is read and no consistency
 * bewteen values is guaranteed.
 */

#ifdef	UV_PERFORMANCE_DATA

/*
 * This structure defines most of the items items that make up the
 * performance data. It may not be possible to gather/maintain all
 * of these items on all systems. Additional data is extracted from
 * other items in the main shared memory segment (E.g. log file size)
 */
 
#define UVPERF_N_USER_CTRS	5

typedef struct
{
    int nProcesses;		/* Total UV processes (parents+children+ etc) */
    int nLeaders;		/* Number of parent UV processes */
    int t30usedSlots;		/* Number of t30table slots used */
    int t30refsTotal;		/* Total number of opens on T30s (refs) */
    int t30splits;		/* Number of splits on T30 files */
    int t30merges;		/* Number of merges on T30 files */
    struct Dstats fileStats;	/* From DBFILE.h - file statistics */
    int userCounter[UVPERF_N_USER_CTRS];	/* Set from BASIC progs */
} PERF_DATA;


/*
 * These macros should be used to increment/decrement/set the
 * various performance counters. For the time being there is no
 * concurrency control here... we are changing shared memory without
 * taking any special lock. This is considered ok for the time
 * being as the performance data is not critical... it does not
 * matter if it is incorrect! Should it be deemed necessary to
 * ensure the accuracy (at a penalty of overall system performance)
 * then these macros should be modified to use atmoic operations
 * or take a 'performance monitor' semaphore.
 */

#define INC_PERF_CTR(X) ((DBshmseg->perfdata.X)++)
#define DEC_PERF_CTR(X) ((DBshmseg->perfdata.X)--)
#define SET_PERF_CTR(X, Y) (DBshmseg->perfdata.X = Y)

#else

/* No performance instrumentation... */

#define INC_PERF_CTR(X)
#define DEC_PERF_CTR(X)
#define SET_PERF_CTR(X, Y)

#endif

#endif

/* End of Module */