Fix: lttng: uninitialized pointer free'd when no sessiond is present
[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 * SPDX-License-Identifier: LGPL-2.1-only
10 *
11 */
12
13 #include <assert.h>
14
15 typedef void (*lttng_release_func)(void *);
16
17 struct lttng_ref {
18 unsigned long count;
19 lttng_release_func release;
20 };
21
22 static inline
23 void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release)
24 {
25 assert(ref);
26 ref->count = 1;
27 ref->release = release;
28 }
29
30 static inline
31 void lttng_ref_get(struct lttng_ref *ref)
32 {
33 assert(ref);
34 ref->count++;
35 /* Overflow check. */
36 assert(ref->count);
37 }
38
39 static inline
40 void lttng_ref_put(struct lttng_ref *ref)
41 {
42 assert(ref);
43 /* Underflow check. */
44 assert(ref->count);
45 if (caa_unlikely((--ref->count) == 0)) {
46 ref->release(ref);
47 }
48 }
49
50 #endif /* LTTNG_REF_INTERNAL_H */
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