Fix typos
[babeltrace.git] / include / babeltrace2 / graph / component-class.h
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fc11e32c 1/*
0235b0db 2 * SPDX-License-Identifier: MIT
fc11e32c 3 *
0235b0db 4 * Copyright (C) 2010-2019 EfficiOS Inc. and Linux Foundation
fc11e32c
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5 */
6
0235b0db
MJ
7#ifndef BABELTRACE2_GRAPH_COMPONENT_CLASS_H
8#define BABELTRACE2_GRAPH_COMPONENT_CLASS_H
9
f38da6ca
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10/* IWYU pragma: private, include <babeltrace2/babeltrace.h> */
11
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12#ifndef __BT_IN_BABELTRACE_H
13# error "Please include <babeltrace2/babeltrace.h> instead."
14#endif
15
3fadfbc0 16#include <babeltrace2/types.h>
b19ff26f 17
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18#ifdef __cplusplus
19extern "C" {
20#endif
21
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22/*!
23@defgroup api-comp-cls Component classes
24@ingroup api-graph
25
26@brief
27 Source, filter, and sink component classes (non-development).
28
29A <strong><em>component class</em></strong> is the class of a \bt_comp:
30
31@image html component.png
32
33@attention
34 This module (component class API) offers basic, read-only functions
35 to get component class properties. To \em create a component class,
36 see \ref api-comp-cls-dev or \ref api-plugin-dev.
37
38You can instantiate a given component class many times, with different
39initialization parameters, to create many components with the
40<code>bt_graph_add_*_component*()</code> functions (see \ref api-graph).
41
42There are two ways to obtain a component class:
43
e7401568 44- Create one programmatically: see \ref api-comp-cls-dev.
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45
46- Borrow one from a \bt_plugin.
47
48 Note that, as of \bt_name_version_min_maj, you cannot access a
49 component class's plugin, if any.
50
51A component class is a \ref api-fund-shared-object "shared object": get
52a new reference with bt_component_class_get_ref() and put an existing
53reference with bt_component_class_put_ref().
54
55The common C&nbsp;type of a component class is #bt_component_class.
56
57There are three types of component classes:
58
59<dl>
60 <dt>\anchor api-comp-cls-src Source component class</dt>
61 <dd>
62 A source component class instance (a \bt_src_comp) \bt_msg_iter
63 emits fresh \bt_p_msg.
64
65 A source component class's specific type is
66 #bt_component_class_source and its type enumerator is
67 #BT_COMPONENT_CLASS_TYPE_SOURCE.
68
69 \ref api-fund-c-typing "Upcast" the #bt_component_class_source type
70 to the #bt_component_class type with
71 bt_component_class_source_as_component_class_const().
72
73 Get a new source component class reference with Use
74 bt_component_class_source_get_ref() and put an existing one with
75 bt_component_class_source_put_ref().
76 </dd>
77
78 <dt>\anchor api-comp-cls-flt Filter component class</dt>
79 <dd>
80 A filter component class instance (a \bt_flt_comp) message iterator
81 emits fresh and transformed messages. It can also discard
82 existing messages.
83
84 A filter component class's specific type is
85 #bt_component_class_filter and its type enumerator is
86 #BT_COMPONENT_CLASS_TYPE_FILTER.
87
88 \ref api-fund-c-typing "Upcast" the #bt_component_class_filter type
89 to the #bt_component_class type with
90 bt_component_class_filter_as_component_class_const().
91
92 Get a new filter component class reference with
93 bt_component_class_filter_get_ref() and put an existing one with
94 bt_component_class_filter_put_ref().
95 </dd>
96
97 <dt>\anchor api-comp-cls-sink Sink component class</dt>
98 <dd>
99 A sink component class instance (a \bt_sink_comp) consumes messages
100 from a source or filter message iterator.
101
102 A filter component class's specific type is #bt_component_class_sink
103 and its type enumerator is #BT_COMPONENT_CLASS_TYPE_SINK.
104
105 \ref api-fund-c-typing "Upcast" the #bt_component_class_sink type to
106 the #bt_component_class type with
107 bt_component_class_sink_as_component_class_const().
108
109 Get a new sink component class reference with
110 bt_component_class_sink_get_ref() and put an existing one with
111 bt_component_class_sink_put_ref().
112 </dd>
113</dl>
114
115Get a component's class type enumerator with
116bt_component_class_get_type(). You can also use the
117bt_component_class_is_source(), bt_component_class_is_filter(), and
118bt_component_class_is_sink() helper functions.
119
120<h1>Properties</h1>
121
122A component class has the following common properties:
123
124<dl>
125 <dt>
126 \anchor api-comp-cls-prop-name
127 Name
128 </dt>
129 <dd>
130 Name of the component class.
131
132 Within a \bt_plugin, for a given component class type, each
133 component class has a unique name.
134
135 Get a component class's name with bt_component_class_get_name().
136 </dd>
137
138 <dt>
139 \anchor api-comp-cls-prop-descr
140 \bt_dt_opt Description
141 </dt>
142 <dd>
143 Textual description of the component class.
144
145 Get a component class's description with
146 bt_component_class_get_description().
147 </dd>
148
149 <dt>
150 \anchor api-comp-cls-prop-help
151 \bt_dt_opt Help text
152 </dt>
153 <dd>
154 Help text of the component class.
155
156 Get a component class's help text with
157 bt_component_class_get_help().
158 </dd>
159</dl>
160*/
161
162/*! @{ */
163
164/*!
165@name Types
166@{
167
168@typedef struct bt_component_class bt_component_class;
169
170@brief
171 Component class.
172
173@typedef struct bt_component_class_source bt_component_class_source;
174
175@brief
176 \bt_c_src_comp_cls.
177
178@typedef struct bt_component_class_filter bt_component_class_filter;
179
180@brief
181 \bt_c_flt_comp_cls.
182
183@typedef struct bt_component_class_sink bt_component_class_sink;
184
185@brief
186 \bt_c_sink_comp_cls.
187
188@}
189*/
190
191/*!
192@name Type query
193@{
194*/
195
196/*!
197@brief
198 Component class type enumerators.
199*/
200typedef enum bt_component_class_type {
201 /*!
202 @brief
203 \bt_c_src_comp_cls.
204 */
205 BT_COMPONENT_CLASS_TYPE_SOURCE = 1 << 0,
206
207 /*!
208 @brief
209 \bt_c_flt_comp_cls.
210 */
211 BT_COMPONENT_CLASS_TYPE_FILTER = 1 << 1,
212
213 /*!
214 @brief
215 \bt_c_sink_comp_cls.
216 */
217 BT_COMPONENT_CLASS_TYPE_SINK = 1 << 2,
218} bt_component_class_type;
219
220/*!
221@brief
222 Returns the type enumerator of the component class
223 \bt_p{component_class}.
224
225@param[in] component_class
226 Component class of which to get the type enumerator.
227
228@returns
229 Type enumerator of \bt_p{component_class}.
230
231@bt_pre_not_null{component_class}
232
233@sa bt_component_class_is_source() &mdash;
234 Returns whether or not a component class is a \bt_src_comp_cls.
235@sa bt_component_class_is_filter() &mdash;
236 Returns whether or not a component class is a \bt_flt_comp_cls.
237@sa bt_component_class_is_sink() &mdash;
238 Returns whether or not a component class is a \bt_sink_comp_cls.
239*/
240extern bt_component_class_type bt_component_class_get_type(
4c81a2b7 241 const bt_component_class *component_class) __BT_NOEXCEPT;
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242
243/*!
244@brief
245 Returns whether or not the component class \bt_p{component_class}
246 is a \bt_src_comp_cls.
247
248@param[in] component_class
249 Component class to check.
250
251@returns
252 #BT_TRUE if \bt_p{component_class} is a source component class.
253
254@bt_pre_not_null{component_class}
255
256@sa bt_component_class_get_type() &mdash;
257 Returns the type enumerator of a component class.
258*/
259static inline
260bt_bool bt_component_class_is_source(
4c81a2b7 261 const bt_component_class *component_class) __BT_NOEXCEPT
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262{
263 return bt_component_class_get_type(component_class) ==
264 BT_COMPONENT_CLASS_TYPE_SOURCE;
265}
266
267/*!
268@brief
269 Returns whether or not the component class \bt_p{component_class}
270 is a \bt_flt_comp_cls.
271
272@param[in] component_class
273 Component class to check.
274
275@returns
276 #BT_TRUE if \bt_p{component_class} is a filter component class.
277
278@bt_pre_not_null{component_class}
279
280@sa bt_component_class_get_type() &mdash;
281 Returns the type enumerator of a component class.
282*/
283static inline
284bt_bool bt_component_class_is_filter(
4c81a2b7 285 const bt_component_class *component_class) __BT_NOEXCEPT
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286{
287 return bt_component_class_get_type(component_class) ==
288 BT_COMPONENT_CLASS_TYPE_FILTER;
289}
290
291/*!
292@brief
293 Returns whether or not the component class \bt_p{component_class}
294 is a \bt_sink_comp_cls.
295
296@param[in] component_class
297 Component class to check.
298
299@returns
300 #BT_TRUE if \bt_p{component_class} is a sink component class.
301
302@bt_pre_not_null{component_class}
303
304@sa bt_component_class_get_type() &mdash;
305 Returns the type enumerator of a component class.
306*/
307static inline
308bt_bool bt_component_class_is_sink(
4c81a2b7 309 const bt_component_class *component_class) __BT_NOEXCEPT
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310{
311 return bt_component_class_get_type(component_class) ==
312 BT_COMPONENT_CLASS_TYPE_SINK;
313}
314
315/*! @} */
316
317/*!
318@name Properties
319@{
320*/
321
322/*!
323@brief
324 Returns the name of the component class \bt_p{component_class}.
325
326See the \ref api-comp-cls-prop-name "name" property.
327
328@param[in] component_class
329 Component class of which to get the name.
330
331@returns
332 @parblock
333 Name of \bt_p{component_class}.
334
335 The returned pointer remains valid as long as \bt_p{component_class}
336 exists.
337 @endparblock
338
339@bt_pre_not_null{component_class}
340*/
341extern const char *bt_component_class_get_name(
4c81a2b7 342 const bt_component_class *component_class) __BT_NOEXCEPT;
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343
344/*!
345@brief
346 Returns the description of the component class
347 \bt_p{component_class}.
348
349See the \ref api-comp-cls-prop-descr "description" property.
350
351@param[in] component_class
352 Component class of which to get the description.
353
354@returns
355 @parblock
356 Description of \bt_p{component_class}, or \c NULL if none.
357
358 The returned pointer remains valid as long as \bt_p{component_class}
359 exists.
360 @endparblock
361
362@bt_pre_not_null{component_class}
363*/
364extern const char *bt_component_class_get_description(
4c81a2b7 365 const bt_component_class *component_class) __BT_NOEXCEPT;
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366
367/*!
368@brief
369 Returns the help text of the component class \bt_p{component_class}.
370
371See the \ref api-comp-cls-prop-help "help text" property.
372
373@param[in] component_class
374 Component class of which to get the help text.
375
376@returns
377 @parblock
378 Help text of \bt_p{component_class}, or \c NULL if none.
379
380 The returned pointer remains valid as long as \bt_p{component_class}
381 exists.
382 @endparblock
383
384@bt_pre_not_null{component_class}
385*/
386extern const char *bt_component_class_get_help(
4c81a2b7 387 const bt_component_class *component_class) __BT_NOEXCEPT;
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388
389/*! @} */
390
391/*!
392@name Common reference count
393@{
394*/
395
396/*!
397@brief
398 Increments the \ref api-fund-shared-object "reference count" of
399 the component class \bt_p{component_class}.
400
401@param[in] component_class
402 @parblock
403 Component class of which to increment the reference count.
404
405 Can be \c NULL.
406 @endparblock
407
408@sa bt_component_put_ref() &mdash;
409 Decrements the reference count of a component class.
410*/
411extern void bt_component_class_get_ref(
4c81a2b7 412 const bt_component_class *component_class) __BT_NOEXCEPT;
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413
414/*!
415@brief
416 Decrements the \ref api-fund-shared-object "reference count" of
417 the component class \bt_p{component_class}.
418
419@param[in] component_class
420 @parblock
421 Component class of which to decrement the reference count.
422
423 Can be \c NULL.
424 @endparblock
425
426@sa bt_component_get_ref() &mdash;
427 Increments the reference count of a component class.
428*/
429extern void bt_component_class_put_ref(
4c81a2b7 430 const bt_component_class *component_class) __BT_NOEXCEPT;
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431
432/*!
433@brief
434 Decrements the reference count of the component class
435 \bt_p{_component_class}, and then sets \bt_p{_component_class}
436 to \c NULL.
437
438@param _component_class
439 @parblock
440 Component class of which to decrement the reference count.
441
442 Can contain \c NULL.
443 @endparblock
444
445@bt_pre_assign_expr{_component_class}
446*/
447#define BT_COMPONENT_CLASS_PUT_REF_AND_RESET(_component_class) \
448 do { \
449 bt_component_class_put_ref(_component_class); \
450 (_component_class) = NULL; \
451 } while (0)
452
453/*!
454@brief
455 Decrements the reference count of the component class \bt_p{_dst},
456 sets \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src}
457 to \c NULL.
458
459This macro effectively moves a component class reference from the
460expression
461\bt_p{_src} to the expression \bt_p{_dst}, putting the existing
462\bt_p{_dst} reference.
463
464@param _dst
465 @parblock
466 Destination expression.
467
468 Can contain \c NULL.
469 @endparblock
470@param _src
471 @parblock
472 Source expression.
473
474 Can contain \c NULL.
475 @endparblock
476
477@bt_pre_assign_expr{_dst}
478@bt_pre_assign_expr{_src}
479*/
480#define BT_COMPONENT_CLASS_MOVE_REF(_dst, _src) \
481 do { \
482 bt_component_class_put_ref(_dst); \
483 (_dst) = (_src); \
484 (_src) = NULL; \
485 } while (0)
486
487/*! @} */
488
489/*!
490@name Source component class upcast
491@{
492*/
493
494/*!
495@brief
496 \ref api-fund-c-typing "Upcasts" the \bt_src_comp_cls
497 \bt_p{component_class} to the common #bt_component_class type.
498
499@param[in] component_class
500 @parblock
501 Source component class to upcast.
502
503 Can be \c NULL.
504 @endparblock
505
506@returns
507 \bt_p{component_class} as a common component class.
508*/
509static inline
510const bt_component_class *
511bt_component_class_source_as_component_class_const(
4c81a2b7 512 const bt_component_class_source *component_class) __BT_NOEXCEPT
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513{
514 return __BT_UPCAST_CONST(bt_component_class, component_class);
515}
516
517/*! @} */
518
519/*!
520@name Source component class reference count
521@{
522*/
523
524/*!
525@brief
526 Increments the \ref api-fund-shared-object "reference count" of
527 the \bt_src_comp_cls \bt_p{component_class}.
528
529@param[in] component_class
530 @parblock
531 Source component class of which to increment the reference count.
532
533 Can be \c NULL.
534 @endparblock
535
536@sa bt_component_class_source_put_ref() &mdash;
537 Decrements the reference count of a source component class.
538*/
539extern void bt_component_class_source_get_ref(
4c81a2b7 540 const bt_component_class_source *component_class) __BT_NOEXCEPT;
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541
542/*!
543@brief
544 Decrements the \ref api-fund-shared-object "reference count" of
545 the \bt_src_comp_cls \bt_p{component_class}.
546
547@param[in] component_class
548 @parblock
549 Source component class of which to decrement the reference count.
550
551 Can be \c NULL.
552 @endparblock
553
554@sa bt_component_class_source_get_ref() &mdash;
555 Increments the reference count of a source component class.
556*/
557extern void bt_component_class_source_put_ref(
4c81a2b7 558 const bt_component_class_source *component_class) __BT_NOEXCEPT;
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559
560/*!
561@brief
562 Decrements the reference count of the \bt_src_comp_cls
563 \bt_p{_component_class}, and then sets \bt_p{_component_class} to
564 \c NULL.
565
566@param _component_class
567 @parblock
568 Source component class of which to decrement the reference count.
569
570 Can contain \c NULL.
571 @endparblock
572
573@bt_pre_assign_expr{_component_class}
574*/
575#define BT_COMPONENT_CLASS_SOURCE_PUT_REF_AND_RESET(_component_class) \
576 do { \
577 bt_component_class_source_put_ref(_component_class); \
578 (_component_class) = NULL; \
579 } while (0)
580
581/*!
582@brief
583 Decrements the reference count of the \bt_src_comp_cls \bt_p{_dst},
584 sets \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to
585 \c NULL.
586
587This macro effectively moves a source component class reference from the
588expression \bt_p{_src} to the expression \bt_p{_dst}, putting the
589existing \bt_p{_dst} reference.
590
591@param _dst
592 @parblock
593 Destination expression.
594
595 Can contain \c NULL.
596 @endparblock
597@param _src
598 @parblock
599 Source expression.
600
601 Can contain \c NULL.
602 @endparblock
603
604@bt_pre_assign_expr{_dst}
605@bt_pre_assign_expr{_src}
606*/
607#define BT_COMPONENT_CLASS_SOURCE_MOVE_REF(_dst, _src) \
608 do { \
609 bt_component_class_source_put_ref(_dst); \
610 (_dst) = (_src); \
611 (_src) = NULL; \
612 } while (0)
613
614/*! @} */
615
616/*!
617@name Filter component class upcast
618@{
619*/
620
621/*!
622@brief
623 \ref api-fund-c-typing "Upcasts" the \bt_flt_comp_cls
624 \bt_p{component_class} to the common #bt_component_class type.
625
626@param[in] component_class
627 @parblock
628 Filter component class to upcast.
629
630 Can be \c NULL.
631 @endparblock
632
633@returns
634 \bt_p{component_class} as a common component class.
635*/
636static inline
637const bt_component_class *
638bt_component_class_filter_as_component_class_const(
4c81a2b7 639 const bt_component_class_filter *component_class) __BT_NOEXCEPT
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640{
641 return __BT_UPCAST_CONST(bt_component_class, component_class);
642}
643
644/*! @} */
645
646/*!
647@name Filter component class reference count
648@{
649*/
650
651/*!
652@brief
653 Increments the \ref api-fund-shared-object "reference count" of
654 the \bt_flt_comp_cls \bt_p{component_class}.
655
656@param[in] component_class
657 @parblock
658 Filter component class of which to increment the reference count.
659
660 Can be \c NULL.
661 @endparblock
662
663@sa bt_component_class_filter_put_ref() &mdash;
664 Decrements the reference count of a filter component class.
665*/
666extern void bt_component_class_filter_get_ref(
4c81a2b7 667 const bt_component_class_filter *component_class) __BT_NOEXCEPT;
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668
669/*!
670@brief
671 Decrements the \ref api-fund-shared-object "reference count" of
672 the \bt_flt_comp_cls \bt_p{component_class}.
673
674@param[in] component_class
675 @parblock
676 Filter component class of which to decrement the reference count.
677
678 Can be \c NULL.
679 @endparblock
680
681@sa bt_component_class_filter_get_ref() &mdash;
682 Increments the reference count of a filter component class.
683*/
684extern void bt_component_class_filter_put_ref(
4c81a2b7 685 const bt_component_class_filter *component_class) __BT_NOEXCEPT;
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686
687/*!
688@brief
689 Decrements the reference count of the \bt_flt_comp_cls
690 \bt_p{_component_class}, and then sets \bt_p{_component_class} to
691 \c NULL.
692
693@param _component_class
694 @parblock
695 Filter component class of which to decrement the reference count.
696
697 Can contain \c NULL.
698 @endparblock
699
700@bt_pre_assign_expr{_component_class}
701*/
702#define BT_COMPONENT_CLASS_FILTER_PUT_REF_AND_RESET(_component_class) \
703 do { \
704 bt_component_class_filter_put_ref(_component_class); \
705 (_component_class) = NULL; \
706 } while (0)
707
708/*!
709@brief
710 Decrements the reference count of the \bt_flt_comp_cls \bt_p{_dst},
711 setsc \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to
712 \c NULL.
713
714This macro effectively moves a filter component class reference from the
715expression \bt_p{_src} to the expression \bt_p{_dst}, putting the
716existing \bt_p{_dst} reference.
717
718@param _dst
719 @parblock
720 Destination expression.
721
722 Can contain \c NULL.
723 @endparblock
724@param _src
725 @parblock
726 Source expression.
727
728 Can contain \c NULL.
729 @endparblock
730
731@bt_pre_assign_expr{_dst}
732@bt_pre_assign_expr{_src}
733*/
734#define BT_COMPONENT_CLASS_FILTER_MOVE_REF(_dst, _src) \
735 do { \
736 bt_component_class_filter_put_ref(_dst); \
737 (_dst) = (_src); \
738 (_src) = NULL; \
739 } while (0)
740
741/*! @} */
742
743/*!
744@name Sink component class upcast
745@{
746*/
747
748/*!
749@brief
750 \ref api-fund-c-typing "Upcasts" the \bt_sink_comp_cls
751 \bt_p{component_class} to the common #bt_component_class type.
752
753@param[in] component_class
754 @parblock
755 Sink component class to upcast.
756
757 Can be \c NULL.
758 @endparblock
759
760@returns
761 \bt_p{component_class} as a common component class.
762*/
763static inline
764const bt_component_class *
765bt_component_class_sink_as_component_class_const(
4c81a2b7 766 const bt_component_class_sink *component_class) __BT_NOEXCEPT
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767{
768 return __BT_UPCAST_CONST(bt_component_class, component_class);
769}
770
771/*! @} */
772
773/*!
774@name Sink component class reference count
775@{
776*/
777
778/*!
779@brief
780 Increments the \ref api-fund-shared-object "reference count" of
781 the \bt_sink_comp_cls \bt_p{component_class}.
782
783@param[in] component_class
784 @parblock
785 Sink component class of which to increment the reference count.
786
787 Can be \c NULL.
788 @endparblock
789
790@sa bt_component_class_sink_put_ref() &mdash;
791 Decrements the reference count of a sink component class.
792*/
793extern void bt_component_class_sink_get_ref(
4c81a2b7 794 const bt_component_class_sink *component_class) __BT_NOEXCEPT;
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795
796/*!
797@brief
798 Decrements the \ref api-fund-shared-object "reference count" of
799 the \bt_sink_comp_cls \bt_p{component_class}.
800
801@param[in] component_class
802 @parblock
803 Sink component class of which to decrement the reference count.
804
805 Can be \c NULL.
806 @endparblock
807
808@sa bt_component_class_sink_get_ref() &mdash;
809 Increments the reference count of a sink component class.
810*/
811extern void bt_component_class_sink_put_ref(
4c81a2b7 812 const bt_component_class_sink *component_class) __BT_NOEXCEPT;
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813
814/*!
815@brief
816 Decrements the reference count of the \bt_sink_comp_cls
817 \bt_p{_component_class}, and then sets \bt_p{_component_class} to
818 \c NULL.
819
820@param _component_class
821 @parblock
822 Sink component class of which to decrement the reference count.
823
824 Can contain \c NULL.
825 @endparblock
826
827@bt_pre_assign_expr{_component_class}
828*/
829#define BT_COMPONENT_CLASS_SINK_PUT_REF_AND_RESET(_component_class) \
830 do { \
831 bt_component_class_sink_put_ref(_component_class); \
832 (_component_class) = NULL; \
833 } while (0)
834
835/*!
836@brief
837 Decrements the reference count of the \bt_sink_comp_cls \bt_p{_dst},
838 sets \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to
839 \c NULL.
840
841This macro effectively moves a sink component class reference from the
842expression \bt_p{_src} to the expression \bt_p{_dst}, putting the
843existing \bt_p{_dst} reference.
844
845@param _dst
846 @parblock
847 Destination expression.
848
849 Can contain \c NULL.
850 @endparblock
851@param _src
852 @parblock
853 Source expression.
854
855 Can contain \c NULL.
856 @endparblock
857
858@bt_pre_assign_expr{_dst}
859@bt_pre_assign_expr{_src}
860*/
861#define BT_COMPONENT_CLASS_SINK_MOVE_REF(_dst, _src) \
862 do { \
863 bt_component_class_sink_put_ref(_dst); \
864 (_dst) = (_src); \
865 (_src) = NULL; \
866 } while (0)
867
868/*! @} */
869
870/*! @} */
2154eb7d 871
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872#ifdef __cplusplus
873}
874#endif
875
924dc299 876#endif /* BABELTRACE2_GRAPH_COMPONENT_CLASS_H */
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