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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_STATS_H
#define ISC_STATS_H 1
/*! \file isc/stats.h */
#include <inttypes.h>
#include <isc/types.h>
ISC_LANG_BEGINDECLS
/*%<
* Flag(s) for isc_stats_dump().
*/
#define ISC_STATSDUMP_VERBOSE 0x00000001 /*%< dump 0-value counters */
/*%<
* Dump callback type.
*/
typedef void (*isc_stats_dumper_t)(isc_statscounter_t, uint64_t, void *);
isc_result_t
isc_stats_create(isc_mem_t *mctx, isc_stats_t **statsp, int ncounters);
/*%<
* Create a statistics counter structure of general type. It counts a general
* set of counters indexed by an ID between 0 and ncounters -1.
*
* Requires:
*\li 'mctx' must be a valid memory context.
*
*\li 'statsp' != NULL && '*statsp' == NULL.
*
* Returns:
*\li ISC_R_SUCCESS -- all ok
*
*\li anything else -- failure
*/
void
isc_stats_attach(isc_stats_t *stats, isc_stats_t **statsp);
/*%<
* Attach to a statistics set.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*
*\li 'statsp' != NULL && '*statsp' == NULL
*/
void
isc_stats_detach(isc_stats_t **statsp);
/*%<
* Detaches from the statistics set.
*
* Requires:
*\li 'statsp' != NULL and '*statsp' is a valid isc_stats_t.
*/
int
isc_stats_ncounters(isc_stats_t *stats);
/*%<
* Returns the number of counters contained in stats.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*
*/
void
isc_stats_increment(isc_stats_t *stats, isc_statscounter_t counter);
/*%<
* Increment the counter-th counter of stats.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*
*\li counter is less than the maximum available ID for the stats specified
* on creation.
*/
void
isc_stats_decrement(isc_stats_t *stats, isc_statscounter_t counter);
/*%<
* Decrement the counter-th counter of stats.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*/
void
isc_stats_dump(isc_stats_t *stats, isc_stats_dumper_t dump_fn, void *arg,
unsigned int options);
/*%<
* Dump the current statistics counters in a specified way. For each counter
* in stats, dump_fn is called with its current value and the given argument
* arg. By default counters that have a value of 0 is skipped; if options has
* the ISC_STATSDUMP_VERBOSE flag, even such counters are dumped.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*/
void
isc_stats_set(isc_stats_t *stats, uint64_t val,
isc_statscounter_t counter);
/*%<
* Set the given counter to the specified value.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*/
void
isc_stats_set(isc_stats_t *stats, uint64_t val,
isc_statscounter_t counter);
/*%<
* Set the given counter to the specified value.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*/
void isc_stats_update_if_greater(isc_stats_t *stats,
isc_statscounter_t counter,
uint64_t value);
/*%<
* Atomically assigns 'value' to 'counter' if value > counter.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*
*\li counter is less than the maximum available ID for the stats specified
* on creation.
*/
uint64_t
isc_stats_get_counter(isc_stats_t *stats, isc_statscounter_t counter);
/*%<
* Returns value currently stored in counter.
*
* Requires:
*\li 'stats' is a valid isc_stats_t.
*
*\li counter is less than the maximum available ID for the stats specified
* on creation.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_STATS_H */
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