mirror of
https://gitlab.isc.org/isc-projects/bind9
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09e4fb2ffa
Returning the value allows for better high-water tracking without running into edge cases like the following: 0. The counter is at value X 1. Increment the value (X+1) 2. The value is decreased multiple times in another threads (X+1-Y) 3. Get the value (X+1-Y) 4. Update-if-greater misses the X+1 value which should have been the high-water
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <isc/magic.h>
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#include <isc/mem.h>
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#include <isc/refcount.h>
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#include <isc/stats.h>
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#include <isc/util.h>
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#include <ns/stats.h>
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#define NS_STATS_MAGIC ISC_MAGIC('N', 's', 't', 't')
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#define NS_STATS_VALID(x) ISC_MAGIC_VALID(x, NS_STATS_MAGIC)
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struct ns_stats {
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/*% Unlocked */
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unsigned int magic;
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isc_mem_t *mctx;
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isc_stats_t *counters;
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isc_refcount_t references;
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};
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void
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ns_stats_attach(ns_stats_t *stats, ns_stats_t **statsp) {
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REQUIRE(NS_STATS_VALID(stats));
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REQUIRE(statsp != NULL && *statsp == NULL);
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isc_refcount_increment(&stats->references);
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*statsp = stats;
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}
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void
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ns_stats_detach(ns_stats_t **statsp) {
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ns_stats_t *stats;
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REQUIRE(statsp != NULL && NS_STATS_VALID(*statsp));
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stats = *statsp;
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*statsp = NULL;
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if (isc_refcount_decrement(&stats->references) == 1) {
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isc_stats_detach(&stats->counters);
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isc_refcount_destroy(&stats->references);
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isc_mem_putanddetach(&stats->mctx, stats, sizeof(*stats));
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}
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}
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void
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ns_stats_create(isc_mem_t *mctx, int ncounters, ns_stats_t **statsp) {
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REQUIRE(statsp != NULL && *statsp == NULL);
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ns_stats_t *stats = isc_mem_get(mctx, sizeof(*stats));
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stats->counters = NULL;
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isc_refcount_init(&stats->references, 1);
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isc_stats_create(mctx, &stats->counters, ncounters);
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stats->magic = NS_STATS_MAGIC;
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stats->mctx = NULL;
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isc_mem_attach(mctx, &stats->mctx);
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*statsp = stats;
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}
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/*%
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* Increment/Decrement methods
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*/
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isc_statscounter_t
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ns_stats_increment(ns_stats_t *stats, isc_statscounter_t counter) {
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REQUIRE(NS_STATS_VALID(stats));
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return (isc_stats_increment(stats->counters, counter));
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}
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void
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ns_stats_decrement(ns_stats_t *stats, isc_statscounter_t counter) {
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REQUIRE(NS_STATS_VALID(stats));
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isc_stats_decrement(stats->counters, counter);
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}
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isc_stats_t *
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ns_stats_get(ns_stats_t *stats) {
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REQUIRE(NS_STATS_VALID(stats));
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return (stats->counters);
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}
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void
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ns_stats_update_if_greater(ns_stats_t *stats, isc_statscounter_t counter,
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isc_statscounter_t value) {
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REQUIRE(NS_STATS_VALID(stats));
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isc_stats_update_if_greater(stats->counters, counter, value);
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}
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isc_statscounter_t
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ns_stats_get_counter(ns_stats_t *stats, isc_statscounter_t counter) {
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REQUIRE(NS_STATS_VALID(stats));
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return (isc_stats_get_counter(stats->counters, counter));
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}
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