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/* The statsobj object.
*
* Copyright 2010-2012 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef INCLUDED_STATSOBJ_H
#define INCLUDED_STATSOBJ_H
#include "atomic.h"
/* The following data item is somewhat dirty, in that it does not follow
* our usual object calling conventions. However, much like with "Debug", we
* do this to gain speed. If we finally come to a platform that does not
* provide resolution of names for dynamically loaded modules, we need to find
* a work-around, but until then, we use the direct access.
* If set to 0, statistics are not gathered, otherwise they are.
*/
extern int GatherStats;
/* our basic counter type -- need 32 bit on 32 bit platform.
* IMPORTANT: this type *MUST* be supported by atomic instructions!
*/
typedef uint64 intctr_t;
/* counter types */
typedef enum statsCtrType_e {
ctrType_IntCtr,
ctrType_Int
} statsCtrType_t;
/* stats line format types */
typedef enum statsFmtType_e {
statsFmt_Legacy,
statsFmt_JSON,
statsFmt_CEE
} statsFmtType_t;
/* helper entity, the counter */
typedef struct ctr_s {
uchar *name;
statsCtrType_t ctrType;
union {
intctr_t *pIntCtr;
int *pInt;
} val;
struct ctr_s *next, *prev;
} ctr_t;
/* the statsobj object */
struct statsobj_s {
BEGINobjInstance; /* Data to implement generic object - MUST be the first data element! */
uchar *name;
pthread_mutex_t mutCtr; /* to guard counter linked-list ops */
ctr_t *ctrRoot; /* doubly-linked list of statsobj counters */
ctr_t *ctrLast;
/* used to link ourselves together */
statsobj_t *prev;
statsobj_t *next;
};
/* interfaces */
BEGINinterface(statsobj) /* name must also be changed in ENDinterface macro! */
INTERFACEObjDebugPrint(statsobj);
rsRetVal (*Construct)(statsobj_t **ppThis);
rsRetVal (*ConstructFinalize)(statsobj_t *pThis);
rsRetVal (*Destruct)(statsobj_t **ppThis);
rsRetVal (*SetName)(statsobj_t *pThis, uchar *name);
rsRetVal (*GetStatsLine)(statsobj_t *pThis, cstr_t **ppcstr);
rsRetVal (*GetAllStatsLines)(rsRetVal(*cb)(void*, cstr_t*), void *usrptr, statsFmtType_t fmt);
rsRetVal (*AddCounter)(statsobj_t *pThis, uchar *ctrName, statsCtrType_t ctrType, void *pCtr);
rsRetVal (*EnableStats)(void);
ENDinterface(statsobj)
#define statsobjCURR_IF_VERSION 10 /* increment whenever you change the interface structure! */
/* Changes
* v2-v9 rserved for future use in "older" version branches
* v10, 2012-04-01: GetAllStatsLines got fmt parameter
*/
/* prototypes */
PROTOTYPEObj(statsobj);
/* macros to handle stats counters
* These are to be used by "counter providers". Note that we MUST
* specify the mutex name, even though at first it looks like it
* could be automatically be generated via e.g. "mut##ctr".
* Unfortunately, this does not work if counter is e.g. "pThis->ctr".
* So we decided, for clarity, to always insist on specifying the mutex
* name (after all, it's just a few more keystrokes...).
* --------------------------------------------------------------------
* NOTE WELL
* --------------------------------------------------------------------
* There are actually two types of stats counters: "regular" counters,
* which are only used for stats purposes and "dual" counters, which
* are primarily used for other purposes but can be included in stats
* as well. ALL regular counters MUST be initialized with
* STATSCOUNTER_INIT and only be modified by STATSCOUNTER_* functions.
* They MUST NOT be used for any other purpose (if this seems to make
* sense, consider changing it to a dual counter).
* Dual counters are somewhat dangerous in that a single variable is
* used for two purposes: the actual application need and stats
* counting. However, this is supported for performance reasons, as it
* provides insight into the inner engine workings without need for
* additional counters (and their maintenance code). Dual counters
* MUST NOT be modified by STATSCOUNTER_* functions. Most importantly,
* it is expected that the actua application code provides proper
* (enough) synchronized access to these counters. Most importantly,
* this means they have NO stats-system mutex associated to them.
*
* The interface function AddCounter() is a read-only function. It
* only provides the stats subsystem with a reference to a counter.
* It is irrelevant if the counter is a regular or dual one. For that
* reason, AddCounter() must not modify the counter contents, as in
* the case of a dual counter application code may be broken.
*/
#define STATSCOUNTER_DEF(ctr, mut) \
intctr_t ctr; \
DEF_ATOMIC_HELPER_MUT64(mut);
#define STATSCOUNTER_INIT(ctr, mut) \
INIT_ATOMIC_HELPER_MUT64(mut); \
ctr = 0;
#define STATSCOUNTER_INC(ctr, mut) \
if(GatherStats) \
ATOMIC_INC_uint64(&ctr, &mut);
#define STATSCOUNTER_DEC(ctr, mut) \
if(GatherStats) \
ATOMIC_DEC_uint64(&ctr, mut);
/* the next macro works only if the variable is already guarded
* by mutex (or the users risks a wrong result). It is assumed
* that there are not concurrent operations that modify the counter.
*/
#define STATSCOUNTER_SETMAX_NOMUT(ctr, newmax) \
if(GatherStats && ((newmax) > (ctr))) \
ctr = newmax;
#endif /* #ifndef INCLUDED_STATSOBJ_H */
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