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83509119 JG |
1 | #ifndef BABELTRACE_OBJECT_INTERNAL_H |
2 | #define BABELTRACE_OBJECT_INTERNAL_H | |
273b65be JG |
3 | |
4 | /* | |
83509119 | 5 | * Babeltrace - Base object |
273b65be | 6 | * |
83509119 JG |
7 | * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
8 | * | |
9 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
273b65be JG |
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 | ||
de3dd40e | 30 | #include <babeltrace/ref-internal.h> |
5d2d9981 | 31 | #include <babeltrace/ref.h> |
273b65be | 32 | |
83509119 JG |
33 | /** |
34 | * All objects publicly exposed by Babeltrace APIs must contain this structure | |
35 | * as their first member. This allows the unification of all ref counting | |
78586d8a | 36 | * mechanisms and may be used to provide more base functionality to all |
83509119 | 37 | * objects. |
de3dd40e | 38 | */ |
83509119 | 39 | struct bt_object { |
de3dd40e | 40 | struct bt_ref ref_count; |
f167d3c0 | 41 | /* Class-specific, optional release function. */ |
5d2d9981 | 42 | bt_object_release_func release; |
f167d3c0 PP |
43 | /* Class-specific, optional "parent is owner" notification listener. */ |
44 | bt_object_release_func parent_is_owner_listener; | |
5d2d9981 JG |
45 | /* @see doc/ref-counting.md */ |
46 | struct bt_object *parent; | |
273b65be JG |
47 | }; |
48 | ||
49 | static inline | |
7c56f3cc MD |
50 | long bt_object_get_ref_count(const void *ptr) |
51 | { | |
52 | const struct bt_object *obj = ptr; | |
5d2d9981 | 53 | |
7c56f3cc MD |
54 | return obj->ref_count.count; |
55 | } | |
56 | ||
57 | static inline | |
5d2d9981 JG |
58 | void bt_object_release(void *ptr) |
59 | { | |
60 | struct bt_object *obj = ptr; | |
61 | ||
0f5e83e5 PP |
62 | #ifdef BT_LOGV |
63 | BT_LOGV("Releasing object: addr=%p, ref-count=%lu", ptr, | |
64 | obj->ref_count.count); | |
65 | #endif | |
66 | ||
36712f1d | 67 | if (obj && obj->release && bt_object_get_ref_count(obj) == 0) { |
5d2d9981 JG |
68 | obj->release(obj); |
69 | } | |
70 | } | |
71 | ||
7c56f3cc | 72 | static inline |
5d2d9981 JG |
73 | void generic_release(struct bt_object *obj) |
74 | { | |
75 | if (obj->parent) { | |
0f5e83e5 PP |
76 | struct bt_object *parent = obj->parent; |
77 | ||
78 | #ifdef BT_LOGV | |
79 | BT_LOGV("Releasing parented object: addr=%p, ref-count=%lu, " | |
80 | "parent-addr=%p, parent-ref-count=%lu", | |
81 | obj, obj->ref_count.count, | |
82 | parent, parent->ref_count.count); | |
83 | #endif | |
f167d3c0 PP |
84 | |
85 | if (obj->parent_is_owner_listener) { | |
86 | /* | |
87 | * Object has a chance to destroy itself here | |
88 | * under certain conditions and notify its | |
89 | * parent. At this point the parent is | |
90 | * guaranteed to exist because it's not put yet. | |
91 | */ | |
92 | obj->parent_is_owner_listener(obj); | |
93 | } | |
94 | ||
5d2d9981 | 95 | /* The release function will be invoked by the parent. */ |
f167d3c0 | 96 | bt_put(parent); |
5d2d9981 JG |
97 | } else { |
98 | bt_object_release(obj); | |
99 | } | |
100 | } | |
101 | ||
102 | static inline | |
dc3fffef | 103 | struct bt_object *bt_object_borrow_parent(void *ptr) |
5d2d9981 JG |
104 | { |
105 | struct bt_object *obj = ptr; | |
106 | ||
dc3fffef PP |
107 | return obj ? obj->parent : NULL; |
108 | } | |
109 | ||
110 | static inline | |
111 | struct bt_object *bt_object_get_parent(void *ptr) | |
112 | { | |
113 | return bt_get(bt_object_borrow_parent(ptr)); | |
5d2d9981 JG |
114 | } |
115 | ||
116 | static inline | |
117 | void bt_object_set_parent(void *child_ptr, void *parent) | |
273b65be | 118 | { |
5d2d9981 JG |
119 | struct bt_object *child = child_ptr; |
120 | ||
121 | if (!child) { | |
122 | return; | |
123 | } | |
124 | ||
0f5e83e5 PP |
125 | #ifdef BT_LOGV |
126 | BT_LOGV("Setting object's parent: addr=%p, parent-addr=%p", | |
127 | child_ptr, parent); | |
128 | #endif | |
129 | ||
5d2d9981 JG |
130 | /* |
131 | * It is assumed that a "child" being "parented" is publicly reachable. | |
132 | * Therefore, a reference to its parent must be taken. The reference | |
133 | * to the parent will be released once the object's reference count | |
134 | * falls to zero. | |
135 | */ | |
5ed18445 | 136 | BT_PUT(child->parent); |
5d2d9981 JG |
137 | child->parent = bt_get(parent); |
138 | } | |
139 | ||
140 | static inline | |
141 | void bt_object_init(void *ptr, bt_object_release_func release) | |
142 | { | |
143 | struct bt_object *obj = ptr; | |
144 | ||
145 | obj->release = release; | |
935e7ed6 | 146 | obj->parent = NULL; |
5d2d9981 | 147 | bt_ref_init(&obj->ref_count, generic_release); |
273b65be JG |
148 | } |
149 | ||
f167d3c0 PP |
150 | static inline |
151 | void bt_object_set_parent_is_owner_listener(void *obj, | |
152 | bt_object_release_func cb) | |
153 | { | |
154 | assert(obj); | |
155 | ((struct bt_object *) obj)->parent_is_owner_listener = cb; | |
156 | } | |
157 | ||
83509119 | 158 | #endif /* BABELTRACE_OBJECT_INTERNAL_H */ |