bt2: split clock value module from clock class module
[babeltrace.git] / include / babeltrace / ref-internal.h
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1#ifndef BABELTRACE_REF_INTERNAL_H
2#define BABELTRACE_REF_INTERNAL_H
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3
4/*
83509119 5 * Babeltrace - Reference Counting
273b65be 6 *
de9dd397 7 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
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8 *
9 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * SOFTWARE.
28 */
29
83509119 30#include <babeltrace/babeltrace-internal.h>
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31#include <assert.h>
32
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33struct bt_object;
34typedef void (*bt_object_release_func)(struct bt_object *);
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35
36struct bt_ref {
78586d8a 37 unsigned long count;
83509119 38 bt_object_release_func release;
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39};
40
41static inline
83509119 42void bt_ref_init(struct bt_ref *ref, bt_object_release_func release)
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43{
44 assert(ref);
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45 ref->count = 1;
46 ref->release = release;
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47}
48
49static inline
de3dd40e 50void bt_ref_get(struct bt_ref *ref)
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51{
52 assert(ref);
0c747e0d 53
a041af48 54 if (unlikely(!ref->release)) {
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55 return;
56 }
57
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58 ref->count++;
59 /* Overflow check. */
60 assert(ref->count);
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61}
62
63static inline
de3dd40e 64void bt_ref_put(struct bt_ref *ref)
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65{
66 assert(ref);
83509119 67 /* Only assert if the object has opted-in for reference counting. */
a041af48 68 if (unlikely((--ref->count) == 0 && ref->release)) {
83509119 69 ref->release((struct bt_object *) ref);
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70 }
71}
72
de3dd40e 73#endif /* BABELTRACE_REF_INTERNAL_H */
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