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stats.h
/* * 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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