projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | * | |
| 9 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
| 10 | * | |
| 11 | * This library is free software; you can redistribute it and/or modify it | |
| 12 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
| 13 | * as published by the Free Software Foundation. | |
| 14 | * | |
| 15 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
| 16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
| 18 | * for more details. | |
| 19 | * | |
| 20 | * You should have received a copy of the GNU Lesser General Public License | |
| 21 | * along with this library; if not, write to the Free Software Foundation, | |
| 22 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 23 | */ | |
| 24 | ||
| 25 | #include <assert.h> | |
| 26 | ||
| 27 | typedef void (*lttng_release_func)(void *); | |
| 28 | ||
| 29 | struct lttng_ref { | |
| 30 | unsigned long count; | |
| 31 | lttng_release_func release; | |
| 32 | }; | |
| 33 | ||
| 34 | static inline | |
| 35 | void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release) | |
| 36 | { | |
| 37 | assert(ref); | |
| 38 | ref->count = 1; | |
| 39 | ref->release = release; | |
| 40 | } | |
| 41 | ||
| 42 | static inline | |
| 43 | void lttng_ref_get(struct lttng_ref *ref) | |
| 44 | { | |
| 45 | assert(ref); | |
| 46 | ref->count++; | |
| 47 | /* Overflow check. */ | |
| 48 | assert(ref->count); | |
| 49 | } | |
| 50 | ||
| 51 | static inline | |
| 52 | void lttng_ref_put(struct lttng_ref *ref) | |
| 53 | { | |
| 54 | assert(ref); | |
| 55 | /* Underflow check. */ | |
| 56 | assert(ref->count); | |
| 57 | if (caa_unlikely((--ref->count) == 0)) { | |
| 58 | ref->release(ref); | |
| 59 | } | |
| 60 | } | |
| 61 | ||
| 62 | #endif /* LTTNG_REF_INTERNAL_H */ |