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8abe313a JG |
1 | /* |
2 | * LTTng - Non thread-safe reference counting | |
3 | * | |
4 | * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
5 | * | |
ab5be9fa | 6 | * SPDX-License-Identifier: LGPL-2.1-only |
8abe313a | 7 | * |
8abe313a JG |
8 | */ |
9 | ||
13d03b1e JG |
10 | #ifndef LTTNG_REF_INTERNAL_H |
11 | #define LTTNG_REF_INTERNAL_H | |
12 | ||
13 | #include <common/macros.hpp> | |
14 | ||
15 | #include <urcu/urcu.h> | |
16 | ||
e665dfbc | 17 | using lttng_release_func = void (*)(void *); |
8abe313a JG |
18 | |
19 | struct lttng_ref { | |
20 | unsigned long count; | |
21 | lttng_release_func release; | |
22 | }; | |
23 | ||
28f23191 | 24 | static inline void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release) |
8abe313a | 25 | { |
a0377dfe | 26 | LTTNG_ASSERT(ref); |
8abe313a JG |
27 | ref->count = 1; |
28 | ref->release = release; | |
29 | } | |
30 | ||
28f23191 | 31 | static inline void lttng_ref_get(struct lttng_ref *ref) |
8abe313a | 32 | { |
a0377dfe | 33 | LTTNG_ASSERT(ref); |
8abe313a JG |
34 | ref->count++; |
35 | /* Overflow check. */ | |
a0377dfe | 36 | LTTNG_ASSERT(ref->count); |
8abe313a JG |
37 | } |
38 | ||
28f23191 | 39 | static inline void lttng_ref_put(struct lttng_ref *ref) |
8abe313a | 40 | { |
a0377dfe | 41 | LTTNG_ASSERT(ref); |
8abe313a | 42 | /* Underflow check. */ |
a0377dfe | 43 | LTTNG_ASSERT(ref->count); |
8abe313a JG |
44 | if (caa_unlikely((--ref->count) == 0)) { |
45 | ref->release(ref); | |
46 | } | |
47 | } | |
48 | ||
49 | #endif /* LTTNG_REF_INTERNAL_H */ |