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/*
* $Id: statistics.h,v 1.8 2006/06/21 18:07:22 bogdan_iancu Exp $
*
* Copyright (C) 2006 Voice Sistem SRL
*
* This file is part of openser, a free SIP server.
*
* openser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* openser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*
* History:
* ---------
* 2006-01-16 first version (bogdan)
*/
#ifndef _STATISTICS_H_
#define _STATISTICS_H_
#include "hash_func.h"
#include "atomic.h"
#define STATS_HASH_POWER 8
#define STATS_HASH_SIZE (1<<(STATS_HASH_POWER))
#define STAT_NO_RESET (1<<0)
#define STAT_NO_SYNC (1<<1)
#define STAT_SHM_NAME (1<<2)
#define STAT_IS_FUNC (1<<3)
#ifdef NO_ATOMIC_OPS
typedef unsigned int stat_val;
#else
typedef atomic_t stat_val;
#endif
typedef unsigned long (*stat_function)(void);
struct module_stats_;
typedef struct stat_var_{
struct module_stats_ *module;
str name;
int flags;
union{
stat_val *val;
stat_function f;
}u;
struct stat_var_ *hnext;
struct stat_var_ *lnext;
} stat_var;
typedef struct module_stats_ {
str name;
int no;
stat_var *head;
stat_var *tail;
} module_stats;
typedef struct stats_collector_ {
int stats_no;
int mod_no;
stat_var* hstats[STATS_HASH_SIZE];
module_stats *amodules;
}stats_collector;
typedef struct stat_export_ {
char* name; /* null terminated statistic name */
int flags; /* flags */
stat_var** stat_pointer; /* pointer to the variable's mem location *
* NOTE - it's in shm mem */
} stat_export_t;
#ifdef STATISTICS
int init_stats_collector();
void destroy_stats_collector();
int register_stat( char *module, char *name, stat_var **pvar, int flags);
int register_module_stats(char *module, stat_export_t *stats);
stat_var* get_stat( str *name );
unsigned int get_stat_val( stat_var *var );
#ifdef NO_ATOMIC_OPS
#include "locking.h"
extern gen_lock_t *stat_lock;
#endif
#else
#define init_stats_collector() 0
#define destroy_stats_collector()
#define register_module_stats(_mod,_stats) 0
#define register_stat( _mod, _name, _pvar, _flags) 0
#define get_stat( _name ) 0
#define get_stat_val( _var ) 0
#endif
#ifdef STATISTICS
#ifdef NO_ATOMIC_OPS
#define update_stat( _var, _n) \
do { \
if ( !((_var)->flags&STAT_IS_FUNC) ) {\
if ((_var)->flags&STAT_NO_SYNC) {\
*((_var)->u.val) += _n;\
} else {\
lock_get(stat_lock);\
*((_var)->u.val) += _n;\
lock_release(stat_lock);\
}\
}\
}while(0)
#define reset_stat( _var) \
do { \
if ( ((_var)->flags&(STAT_NO_RESET|STAT_IS_FUNC))==0 ) {\
if ((_var)->flags&STAT_NO_SYNC) {\
*((_var)->u.val) = 0;\
} else {\
lock_get(stat_lock);\
*((_var)->u.val) = 0;\
lock_release(stat_lock);\
}\
}\
}while(0)
#define get_stat_val( _var ) ((unsigned long)\
((_var)->flags&STAT_IS_FUNC)?(_var)->u.f():*((_var)->u.val))
#else
#define update_stat( _var, _n) \
do { \
if ( !((_var)->flags&STAT_IS_FUNC) ) {\
if (_n>=0) \
atomic_add( _n, (_var)->u.val);\
else \
atomic_sub( -(_n), (_var)->u.val);\
}\
}while(0)
#define reset_stat( _var) \
do { \
if ( ((_var)->flags&(STAT_NO_RESET|STAT_IS_FUNC))==0 ) {\
atomic_set( (_var)->u.val, 0);\
}\
}while(0)
#define get_stat_val( _var ) ((unsigned long)\
((_var)->flags&STAT_IS_FUNC)?(_var)->u.f():(_var)->u.val->counter)
#endif /* NO_ATOMIC_OPS */
#define if_update_stat(_c, _var, _n) \
do { \
if (_c) update_stat( _var, _n); \
}while(0)
#define if_reset_stat(_c, _var, _n) \
do { \
if (_c) reset_stat( _var, _n); \
}while(0)
#else
#define update_stat( _var, _n)
#define reset_stat( _var)
#define if_update_stat( _c, _var, _n)
#define if_reset_stat( _c, _var)
#endif /*STATISTICS*/
#endif
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