stats.c revision 1.2.2.2 1 /* $NetBSD: stats.c,v 1.2.2.2 2018/09/06 06:55:12 pgoyette 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 DESTROYLOCK(&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 result = isc_mutex_init(&stats->lock);
86 if (result != ISC_R_SUCCESS)
87 goto clean_stats;
88
89 result = isc_stats_create(mctx, &stats->counters, ncounters);
90 if (result != ISC_R_SUCCESS)
91 goto clean_mutex;
92
93 stats->magic = NS_STATS_MAGIC;
94 stats->mctx = NULL;
95 isc_mem_attach(mctx, &stats->mctx);
96 *statsp = stats;
97
98 return (ISC_R_SUCCESS);
99
100 clean_mutex:
101 DESTROYLOCK(&stats->lock);
102 clean_stats:
103 isc_mem_put(mctx, stats, sizeof(*stats));
104
105 return (result);
106 }
107
108 /*%
109 * Increment/Decrement methods
110 */
111 void
112 ns_stats_increment(ns_stats_t *stats, isc_statscounter_t counter) {
113 REQUIRE(NS_STATS_VALID(stats));
114
115 isc_stats_increment(stats->counters, counter);
116 }
117
118 void
119 ns_stats_decrement(ns_stats_t *stats, isc_statscounter_t counter) {
120 REQUIRE(NS_STATS_VALID(stats));
121
122 isc_stats_decrement(stats->counters, counter);
123 }
124
125 isc_stats_t *
126 ns_stats_get(ns_stats_t *stats) {
127 REQUIRE(NS_STATS_VALID(stats));
128
129 return (stats->counters);
130 }
131