1 #ifndef BABELTRACE_CTF_IR_STREAM_CLASS_H
2 #define BABELTRACE_CTF_IR_STREAM_CLASS_H
5 * BabelTrace - CTF IR: Stream Class
7 * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
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:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
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
29 * The Common Trace Format (CTF) Specification is available at
30 * http://www.efficios.com/ctf
39 struct bt_ctf_event_class
;
40 struct bt_ctf_stream_class
;
44 * bt_ctf_stream_class_create: create a stream class.
46 * Allocate a new stream class of the given name. The creation of an event class
47 * sets its reference count to 1.
49 * A stream class' packet context is a structure initialized with the following
51 * - uint64_t timestamp_begin
52 * - uint64_t timestamp_end
53 * - uint64_t content_size
54 * - uint64_t packet_size
55 * - uint64_t events_discarded
57 * A stream class's event header is a structure initialized the following
60 * - uint64_t timestamp
62 * @param name Stream name, NULL to create an unnamed stream class.
64 * Returns an allocated stream class on success, NULL on error.
66 extern struct bt_ctf_stream_class
*bt_ctf_stream_class_create(const char *name
);
69 * bt_ctf_stream_class_get_name: Get a stream class' name.
71 * @param stream_class Stream class.
73 * Returns the stream class' name, NULL on error.
75 extern const char *bt_ctf_stream_class_get_name(
76 struct bt_ctf_stream_class
*stream_class
);
79 * bt_ctf_stream_class_set_name: Set a stream class' name.
81 * @param stream_class Stream class.
83 * Returns 0 on success, a negative value on error.
85 extern int bt_ctf_stream_class_set_name(
86 struct bt_ctf_stream_class
*stream_class
, const char *name
);
89 * bt_ctf_stream_class_get_clock: get the clock associated with a stream class.
91 * @param stream_class Stream class.
93 * Returns a clock instance, NULL on error.
95 extern struct bt_ctf_clock
*bt_ctf_stream_class_get_clock(
96 struct bt_ctf_stream_class
*stream_class
);
99 * bt_ctf_stream_class_set_clock: assign a clock to a stream class.
101 * Assign a clock to a stream class. This clock will be sampled each time an
102 * event is appended to an instance of this stream class.
104 * @param stream_class Stream class.
105 * @param clock Clock to assign to the provided stream class.
107 * Returns 0 on success, a negative value on error.
109 extern int bt_ctf_stream_class_set_clock(
110 struct bt_ctf_stream_class
*stream_class
,
111 struct bt_ctf_clock
*clock
);
114 * bt_ctf_stream_class_get_id: Get a stream class' id.
116 * @param stream_class Stream class.
118 * Returns the stream class' id, a negative value on error.
120 extern int64_t bt_ctf_stream_class_get_id(
121 struct bt_ctf_stream_class
*stream_class
);
124 * bt_ctf_stream_class_set_id: Set a stream class' id.
126 * Set a stream class' id. Must be unique trace-wise.
127 * Note that stream classes are assigned a unique id when a stream instance
128 * is created for the first time from a trace or writer.
130 * @param stream_class Stream class.
131 * @param id Stream class id.
133 * Returns 0 on success, a negative value on error.
135 extern int bt_ctf_stream_class_set_id(
136 struct bt_ctf_stream_class
*stream_class
, uint32_t id
);
139 * bt_ctf_stream_class_set_clock: assign a clock to a stream class.
141 * Add an event class to a stream class. New events can be added even after a
142 * stream has beem instanciated and events have been appended. However, a stream
143 * will not accept events of a class that has not been registered beforehand.
144 * The stream class will share the ownership of "event_class" by incrementing
145 * its reference count.
147 * Note that an event class may only be added to one stream class. It
148 * also becomes immutable.
150 * @param stream_class Stream class.
151 * @param event_class Event class to add to the provided stream class.
153 * Returns 0 on success, a negative value on error.
155 extern int bt_ctf_stream_class_add_event_class(
156 struct bt_ctf_stream_class
*stream_class
,
157 struct bt_ctf_event_class
*event_class
);
160 * bt_ctf_stream_class_get_event_class_count: Get a stream class' event class
163 * @param stream_class Stream class.
165 * Returns the stream class' event count, a negative value on error.
167 extern int bt_ctf_stream_class_get_event_class_count(
168 struct bt_ctf_stream_class
*stream_class
);
171 * bt_ctf_stream_class_get_event_class: Get stream class event class by index.
173 * @param stream_class Stream class.
174 * @param index Index of field.
176 * Returns event class, NULL on error.
178 extern struct bt_ctf_event_class
*bt_ctf_stream_class_get_event_class(
179 struct bt_ctf_stream_class
*stream_class
, int index
);
182 * bt_ctf_stream_class_get_event_class_by_name: Get stream class event class by
185 * @param stream_class Stream class.
186 * @param name Event name.
188 * Returns event class, NULL on error.
190 extern struct bt_ctf_event_class
*bt_ctf_stream_class_get_event_class_by_name(
191 struct bt_ctf_stream_class
*stream_class
, const char *name
);
194 * bt_ctf_stream_class_get_packet_context_type: get the stream class' packet
197 * @param stream_class Stream class.
199 * Returns the packet context's type (a structure), NULL on error.
201 extern struct bt_ctf_field_type
*bt_ctf_stream_class_get_packet_context_type(
202 struct bt_ctf_stream_class
*stream_class
);
205 * bt_ctf_stream_class_set_packet_context_type: set the stream class' packet
208 * @param stream_class Stream class.
209 * @param packet_context_type Packet context type (must be a structure).
211 * Returns 0 on success, a negative value on error.
213 extern int bt_ctf_stream_class_set_packet_context_type(
214 struct bt_ctf_stream_class
*stream_class
,
215 struct bt_ctf_field_type
*packet_context_type
);
218 * bt_ctf_stream_class_get_event_header_type: get the stream class'
221 * @param stream_class Stream class.
223 * Returns the stream event header's type (a structure), NULL on error.
225 extern struct bt_ctf_field_type
*
226 bt_ctf_stream_class_get_event_header_type(
227 struct bt_ctf_stream_class
*stream_class
);
230 * bt_ctf_stream_class_set_event_header_type: set the stream class'
233 * @param stream_class Stream class.
234 * @param event_header_type Event header type (must be a structure).
236 * Returns 0 on success, a negative value on error.
238 extern int bt_ctf_stream_class_set_event_header_type(
239 struct bt_ctf_stream_class
*stream_class
,
240 struct bt_ctf_field_type
*event_header_type
);
243 * bt_ctf_stream_class_get_event_context_type: get the stream class'
244 * event context type.
246 * @param stream_class Stream class.
248 * Returns the stream event context's type (a structure), NULL on error.
250 extern struct bt_ctf_field_type
*
251 bt_ctf_stream_class_get_event_context_type(
252 struct bt_ctf_stream_class
*stream_class
);
255 * bt_ctf_stream_class_set_event_context_type: set the stream class'
256 * event context type.
258 * @param stream_class Stream class.
259 * @param event_context_type Event context type (must be a structure).
261 * Returns 0 on success, a negative value on error.
263 extern int bt_ctf_stream_class_set_event_context_type(
264 struct bt_ctf_stream_class
*stream_class
,
265 struct bt_ctf_field_type
*event_context_type
);
268 * bt_ctf_stream_class_get and bt_ctf_stream_class_put: increment and
269 * decrement the stream class' reference count.
271 * These functions ensure that the stream class won't be destroyed while it
272 * is in use. The same number of get and put (plus one extra put to
273 * release the initial reference done at creation) have to be done to
274 * destroy a stream class.
276 * When the stream class' reference count is decremented to 0 by a
277 * bt_ctf_stream_class_put, the stream class is freed.
279 * @param stream_class Stream class.
281 extern void bt_ctf_stream_class_get(struct bt_ctf_stream_class
*stream_class
);
282 extern void bt_ctf_stream_class_put(struct bt_ctf_stream_class
*stream_class
);
288 #endif /* BABELTRACE_CTF_IR_STREAM_CLASS_H */
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