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8abe313a JG |
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 | * | |
ab5be9fa | 9 | * SPDX-License-Identifier: LGPL-2.1-only |
8abe313a | 10 | * |
8abe313a JG |
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 */ |