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[lttng-tools.git] / include / lttng / ref-internal.h
1 #ifndef LTTNG_REF_INTERNAL_H
2 #define LTTNG_REF_INTERNAL_H
3
4 /*
5 * LTTng - Non thread-safe reference counting
6 *
7 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
8 *
9 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
10 *
11 * This library is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU Lesser General Public License, version 2.1 only,
13 * as published by the Free Software Foundation.
14 *
15 * This library is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include <assert.h>
26
27 typedef void (*lttng_release_func)(void *);
28
29 struct lttng_ref {
30 unsigned long count;
31 lttng_release_func release;
32 };
33
34 static inline
35 void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release)
36 {
37 assert(ref);
38 ref->count = 1;
39 ref->release = release;
40 }
41
42 static inline
43 void lttng_ref_get(struct lttng_ref *ref)
44 {
45 assert(ref);
46 ref->count++;
47 /* Overflow check. */
48 assert(ref->count);
49 }
50
51 static inline
52 void lttng_ref_put(struct lttng_ref *ref)
53 {
54 assert(ref);
55 /* Underflow check. */
56 assert(ref->count);
57 if (caa_unlikely((--ref->count) == 0)) {
58 ref->release(ref);
59 }
60 }
61
62 #endif /* LTTNG_REF_INTERNAL_H */
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