tap-driver.sh: flush stdout after each test result
[babeltrace.git] / include / babeltrace2 / object-internal.h
1 #ifndef BABELTRACE_OBJECT_INTERNAL_H
2 #define BABELTRACE_OBJECT_INTERNAL_H
3
4 /*
5 * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
6 * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * SOFTWARE.
25 */
26
27 #include <babeltrace2/babeltrace-internal.h>
28 #include <babeltrace2/assert-internal.h>
29 #include <stdbool.h>
30
31 struct bt_object;
32
33 typedef void (*bt_object_release_func)(struct bt_object *);
34 typedef void (*bt_object_parent_is_owner_listener_func)(
35 struct bt_object *);
36
37 static inline
38 void bt_object_get_no_null_check(const void *obj);
39
40 static inline
41 void bt_object_put_no_null_check(const void *obj);
42
43 /*
44 * Babeltrace object base.
45 *
46 * All objects publicly exposed by Babeltrace APIs must contain this
47 * object as their first member.
48 */
49 struct bt_object {
50 /*
51 * True if this object is shared, that is, it has a reference
52 * count.
53 */
54 bool is_shared;
55
56 /*
57 * Current reference count.
58 */
59 unsigned long long ref_count;
60
61 /*
62 * Release function called when the object's reference count
63 * falls to zero. For an object with a parent, this function is
64 * bt_object_with_parent_release_func(), which calls
65 * `spec_release_func` below if there's no current parent.
66 */
67 bt_object_release_func release_func;
68
69 /*
70 * Specific release function called by
71 * bt_object_with_parent_release_func() or directly by a
72 * parent object.
73 */
74 bt_object_release_func spec_release_func;
75
76 /*
77 * Optional callback for an object with a parent, called by
78 * bt_object_with_parent_release_func() to indicate to the
79 * object that its parent is its owner.
80 */
81 bt_object_parent_is_owner_listener_func
82 parent_is_owner_listener_func;
83
84 /*
85 * Optional parent object.
86 */
87 struct bt_object *parent;
88 };
89
90 static inline
91 unsigned long long bt_object_get_ref_count(const struct bt_object *c_obj)
92 {
93 struct bt_object *obj = (void *) c_obj;
94
95 BT_ASSERT(obj);
96 BT_ASSERT(obj->is_shared);
97 return obj->ref_count;
98 }
99
100 static inline
101 struct bt_object *bt_object_borrow_parent(const struct bt_object *c_obj)
102 {
103 struct bt_object *obj = (void *) c_obj;
104
105 BT_ASSERT(obj);
106 BT_ASSERT(obj->is_shared);
107 return obj->parent;
108 }
109
110 static inline
111 struct bt_object *bt_object_get_parent(const struct bt_object *c_obj)
112 {
113 struct bt_object *obj = (void *) c_obj;
114 struct bt_object *parent = bt_object_borrow_parent(obj);
115
116 if (parent) {
117 bt_object_get_no_null_check(parent);
118 }
119
120 return parent;
121 }
122
123 static inline
124 void bt_object_set_parent(struct bt_object *child, struct bt_object *parent)
125 {
126 BT_ASSERT(child);
127 BT_ASSERT(child->is_shared);
128
129 #ifdef BT_LOGV
130 BT_LOGV("Setting object's parent: addr=%p, parent-addr=%p",
131 child, parent);
132 #endif
133
134 /*
135 * It is assumed that a "child" having a parent is publicly
136 * reachable. Therefore, a reference to its parent must be
137 * taken. The reference to the parent will be released once the
138 * object's reference count falls to zero.
139 */
140 if (parent) {
141 BT_ASSERT(!child->parent);
142 child->parent = parent;
143 bt_object_get_no_null_check(parent);
144 } else {
145 if (child->parent) {
146 bt_object_put_no_null_check(child->parent);
147 }
148
149 child->parent = NULL;
150 }
151 }
152
153 static inline
154 void bt_object_try_spec_release(struct bt_object *obj)
155 {
156 BT_ASSERT(obj);
157 BT_ASSERT(obj->is_shared);
158 BT_ASSERT(obj->spec_release_func);
159
160 if (bt_object_get_ref_count(obj) == 0) {
161 obj->spec_release_func(obj);
162 }
163 }
164
165 static inline
166 void bt_object_with_parent_release_func(struct bt_object *obj)
167 {
168 if (obj->parent) {
169 /*
170 * Keep our own copy of the parent address because `obj`
171 * could be destroyed in
172 * obj->parent_is_owner_listener_func().
173 */
174 struct bt_object *parent = obj->parent;
175
176 #ifdef BT_LOGV
177 BT_LOGV("Releasing parented object: addr=%p, ref-count=%llu, "
178 "parent-addr=%p, parent-ref-count=%llu",
179 obj, obj->ref_count,
180 parent, parent->ref_count);
181 #endif
182
183 if (obj->parent_is_owner_listener_func) {
184 /*
185 * Object has a chance to destroy itself here
186 * under certain conditions and notify its
187 * parent. At this point the parent is
188 * guaranteed to exist because it's not put yet.
189 */
190 obj->parent_is_owner_listener_func(obj);
191 }
192
193 /* The release function will be invoked by the parent. */
194 bt_object_put_no_null_check(parent);
195 } else {
196 bt_object_try_spec_release(obj);
197 }
198 }
199
200 static inline
201 void bt_object_init(struct bt_object *obj, bool is_shared,
202 bt_object_release_func release_func)
203 {
204 BT_ASSERT(obj);
205 BT_ASSERT(!is_shared || release_func);
206 obj->is_shared = is_shared;
207 obj->release_func = release_func;
208 obj->parent_is_owner_listener_func = NULL;
209 obj->spec_release_func = NULL;
210 obj->parent = NULL;
211 obj->ref_count = 1;
212 }
213
214 static inline
215 void bt_object_init_shared(struct bt_object *obj,
216 bt_object_release_func release_func)
217 {
218 bt_object_init(obj, true, release_func);
219 }
220
221 static inline
222 void bt_object_init_unique(struct bt_object *obj)
223 {
224 bt_object_init(obj, false, NULL);
225 }
226
227 static inline
228 void bt_object_init_shared_with_parent(struct bt_object *obj,
229 bt_object_release_func spec_release_func)
230 {
231 BT_ASSERT(obj);
232 BT_ASSERT(spec_release_func);
233 bt_object_init_shared(obj, bt_object_with_parent_release_func);
234 obj->spec_release_func = spec_release_func;
235 }
236
237 static inline
238 void bt_object_set_parent_is_owner_listener_func(struct bt_object *obj,
239 bt_object_parent_is_owner_listener_func func)
240 {
241 BT_ASSERT(obj);
242 BT_ASSERT(obj->is_shared);
243 BT_ASSERT(obj->spec_release_func);
244 ((struct bt_object *) obj)->parent_is_owner_listener_func = func;
245 }
246
247 static inline
248 void bt_object_inc_ref_count(const struct bt_object *c_obj)
249 {
250 struct bt_object *obj = (void *) c_obj;
251
252 BT_ASSERT(obj);
253 BT_ASSERT(obj->is_shared);
254 obj->ref_count++;
255 BT_ASSERT(obj->ref_count != 0);
256 }
257
258 static inline
259 void bt_object_get_no_null_check_no_parent_check(const struct bt_object *c_obj)
260 {
261 struct bt_object *obj = (void *) c_obj;
262
263 BT_ASSERT(obj);
264 BT_ASSERT(obj->is_shared);
265
266 #ifdef BT_LOGV
267 BT_LOGV("Incrementing object's reference count: %llu -> %llu: "
268 "addr=%p, cur-count=%llu, new-count=%llu",
269 obj->ref_count, obj->ref_count + 1,
270 obj, obj->ref_count, obj->ref_count + 1);
271 #endif
272
273 bt_object_inc_ref_count(obj);
274 }
275
276 static inline
277 void bt_object_get_no_null_check(const void *c_obj)
278 {
279 struct bt_object *obj = (void *) c_obj;
280
281 BT_ASSERT(obj);
282 BT_ASSERT(obj->is_shared);
283
284 if (unlikely(obj->parent && bt_object_get_ref_count(obj) == 0)) {
285 #ifdef BT_LOGV
286 BT_LOGV("Incrementing object's parent's reference count: "
287 "addr=%p, parent-addr=%p", obj, obj->parent);
288 #endif
289
290 bt_object_get_no_null_check(obj->parent);
291 }
292
293 #ifdef BT_LOGV
294 BT_LOGV("Incrementing object's reference count: %llu -> %llu: "
295 "addr=%p, cur-count=%llu, new-count=%llu",
296 obj->ref_count, obj->ref_count + 1,
297 obj, obj->ref_count, obj->ref_count + 1);
298 #endif
299
300 bt_object_inc_ref_count(obj);
301 }
302
303 static inline
304 void bt_object_put_no_null_check(const void *c_obj)
305 {
306 struct bt_object *obj = (void *) c_obj;
307
308 BT_ASSERT(obj);
309 BT_ASSERT(obj->is_shared);
310 BT_ASSERT(obj->ref_count > 0);
311
312 #ifdef BT_LOGV
313 BT_LOGV("Decrementing object's reference count: %llu -> %llu: "
314 "addr=%p, cur-count=%llu, new-count=%llu",
315 obj->ref_count, obj->ref_count - 1,
316 obj, obj->ref_count, obj->ref_count - 1);
317 #endif
318
319 obj->ref_count--;
320
321 if (obj->ref_count == 0) {
322 BT_ASSERT(obj->release_func);
323 obj->release_func(obj);
324 }
325 }
326
327 static inline
328 void bt_object_get_ref(const void *ptr)
329 {
330 struct bt_object *obj = (void *) ptr;
331
332 if (unlikely(!obj)) {
333 return;
334 }
335
336 #ifdef BT_ASSERT_PRE
337 BT_ASSERT_PRE(obj->is_shared, "Object is not shared: %!+O", obj);
338 #endif
339
340 bt_object_get_no_null_check(obj);
341 }
342
343 static inline
344 void bt_object_put_ref(const void *ptr)
345 {
346 struct bt_object *obj = (void *) ptr;
347
348 if (unlikely(!obj)) {
349 return;
350 }
351
352 #ifdef BT_ASSERT_PRE
353 BT_ASSERT_PRE(obj->is_shared, "Object is not shared: %!+O", obj);
354 BT_ASSERT_PRE(bt_object_get_ref_count(obj) > 0,
355 "Decrementing a reference count set to 0: %!+O", ptr);
356 #endif
357
358 bt_object_put_no_null_check(obj);
359 }
360
361 #define BT_OBJECT_PUT_REF_AND_RESET(_var) \
362 do { \
363 bt_object_put_ref(_var); \
364 (_var) = NULL; \
365 } while (0)
366
367 #define BT_OBJECT_MOVE_REF(_var_dst, _var_src) \
368 do { \
369 bt_object_put_ref(_var_dst); \
370 (_var_dst) = (_var_src); \
371 (_var_src) = NULL; \
372 } while (0)
373
374 #endif /* BABELTRACE_OBJECT_INTERNAL_H */
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