stats.c revision 1.1.1.2 1 /* $NetBSD: stats.c,v 1.1.1.2 2019/01/09 16:48:22 christos Exp $ */
2
3 /*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * This Source Code Form is subject to the terms of the Mozilla Public
7 * License, v. 2.0. If a copy of the MPL was not distributed with this
8 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 *
10 * See the COPYRIGHT file distributed with this work for additional
11 * information regarding copyright ownership.
12 */
13
14 /*! \file */
15
16 #include <config.h>
17
18 #include <isc/magic.h>
19 #include <isc/mem.h>
20 #include <isc/stats.h>
21 #include <isc/util.h>
22
23 #include <ns/stats.h>
24
25 #define NS_STATS_MAGIC ISC_MAGIC('N', 's', 't', 't')
26 #define NS_STATS_VALID(x) ISC_MAGIC_VALID(x, NS_STATS_MAGIC)
27
28 struct ns_stats {
29 /*% Unlocked */
30 unsigned int magic;
31 isc_mem_t *mctx;
32 isc_mutex_t lock;
33 isc_stats_t *counters;
34
35 /*% Locked by lock */
36 unsigned int references;
37 };
38
39 void
40 ns_stats_attach(ns_stats_t *stats, ns_stats_t **statsp) {
41 REQUIRE(NS_STATS_VALID(stats));
42 REQUIRE(statsp != NULL && *statsp == NULL);
43
44 LOCK(&stats->lock);
45 stats->references++;
46 UNLOCK(&stats->lock);
47
48 *statsp = stats;
49 }
50
51 void
52 ns_stats_detach(ns_stats_t **statsp) {
53 ns_stats_t *stats;
54
55 REQUIRE(statsp != NULL && NS_STATS_VALID(*statsp));
56
57 stats = *statsp;
58 *statsp = NULL;
59
60 LOCK(&stats->lock);
61 stats->references--;
62 UNLOCK(&stats->lock);
63
64 if (stats->references == 0) {
65 isc_stats_detach(&stats->counters);
66 isc_mutex_destroy(&stats->lock);
67 isc_mem_putanddetach(&stats->mctx, stats, sizeof(*stats));
68 }
69 }
70
71 isc_result_t
72 ns_stats_create(isc_mem_t *mctx, int ncounters, ns_stats_t **statsp) {
73 ns_stats_t *stats;
74 isc_result_t result;
75
76 REQUIRE(statsp != NULL && *statsp == NULL);
77
78 stats = isc_mem_get(mctx, sizeof(*stats));
79 if (stats == NULL)
80 return (ISC_R_NOMEMORY);
81
82 stats->counters = NULL;
83 stats->references = 1;
84
85 isc_mutex_init(&stats->lock);
86
87 result = isc_stats_create(mctx, &stats->counters, ncounters);
88 if (result != ISC_R_SUCCESS)
89 goto clean_mutex;
90
91 stats->magic = NS_STATS_MAGIC;
92 stats->mctx = NULL;
93 isc_mem_attach(mctx, &stats->mctx);
94 *statsp = stats;
95
96 return (ISC_R_SUCCESS);
97
98 clean_mutex:
99 isc_mutex_destroy(&stats->lock);
100 isc_mem_put(mctx, stats, sizeof(*stats));
101
102 return (result);
103 }
104
105 /*%
106 * Increment/Decrement methods
107 */
108 void
109 ns_stats_increment(ns_stats_t *stats, isc_statscounter_t counter) {
110 REQUIRE(NS_STATS_VALID(stats));
111
112 isc_stats_increment(stats->counters, counter);
113 }
114
115 void
116 ns_stats_decrement(ns_stats_t *stats, isc_statscounter_t counter) {
117 REQUIRE(NS_STATS_VALID(stats));
118
119 isc_stats_decrement(stats->counters, counter);
120 }
121
122 isc_stats_t *
123 ns_stats_get(ns_stats_t *stats) {
124 REQUIRE(NS_STATS_VALID(stats));
125
126 return (stats->counters);
127 }
128