projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |