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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 | ||
e665dfbc | 13 | using lttng_release_func = void (*)(void *); |
8abe313a JG |
14 | |
15 | struct lttng_ref { | |
16 | unsigned long count; | |
17 | lttng_release_func release; | |
18 | }; | |
19 | ||
20 | static inline | |
21 | void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release) | |
22 | { | |
a0377dfe | 23 | LTTNG_ASSERT(ref); |
8abe313a JG |
24 | ref->count = 1; |
25 | ref->release = release; | |
26 | } | |
27 | ||
28 | static inline | |
29 | void lttng_ref_get(struct lttng_ref *ref) | |
30 | { | |
a0377dfe | 31 | LTTNG_ASSERT(ref); |
8abe313a JG |
32 | ref->count++; |
33 | /* Overflow check. */ | |
a0377dfe | 34 | LTTNG_ASSERT(ref->count); |
8abe313a JG |
35 | } |
36 | ||
37 | static inline | |
38 | void lttng_ref_put(struct lttng_ref *ref) | |
39 | { | |
a0377dfe | 40 | LTTNG_ASSERT(ref); |
8abe313a | 41 | /* Underflow check. */ |
a0377dfe | 42 | LTTNG_ASSERT(ref->count); |
8abe313a JG |
43 | if (caa_unlikely((--ref->count) == 0)) { |
44 | ref->release(ref); | |
45 | } | |
46 | } | |
47 | ||
48 | #endif /* LTTNG_REF_INTERNAL_H */ |