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d7bfb9b0 JG |
1 | /* |
2 | * Copyright (C) 2022 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0-only | |
5 | * | |
6 | */ | |
7 | ||
d7bfb9b0 | 8 | #include "ust-app.hpp" |
28ab034a | 9 | #include "ust-registry-channel.hpp" |
d7bfb9b0 JG |
10 | #include "ust-registry-event.hpp" |
11 | ||
12 | #include <common/error.hpp> | |
13 | #include <common/exception.hpp> | |
14 | #include <common/hashtable/utils.hpp> | |
15 | #include <common/make-unique-wrapper.hpp> | |
24ed18f2 | 16 | #include <common/make-unique.hpp> |
d7bfb9b0 JG |
17 | #include <common/urcu.hpp> |
18 | ||
19 | namespace lst = lttng::sessiond::trace; | |
20 | namespace lsu = lttng::sessiond::ust; | |
21 | ||
22 | namespace { | |
23 | bool is_max_event_id(uint32_t id) | |
24 | { | |
25 | return id == UINT32_MAX; | |
26 | } | |
27 | ||
28 | unsigned long ht_hash_event(const void *_key, unsigned long seed) | |
29 | { | |
30 | uint64_t hashed_key; | |
31 | const lttng::sessiond::ust::registry_event *key = | |
28ab034a | 32 | (lttng::sessiond::ust::registry_event *) _key; |
d7bfb9b0 JG |
33 | |
34 | LTTNG_ASSERT(key); | |
35 | ||
36 | hashed_key = (uint64_t) hash_key_str(key->name.c_str(), seed); | |
37 | ||
38 | return hash_key_u64(&hashed_key, seed); | |
39 | } | |
40 | ||
41 | /* | |
42 | * Hash table match function for event in the registry. | |
43 | */ | |
44 | int ht_match_event(struct cds_lfht_node *node, const void *_key) | |
45 | { | |
46 | const lttng::sessiond::ust::registry_event *key; | |
47 | lttng::sessiond::ust::registry_event *event; | |
48 | ||
49 | LTTNG_ASSERT(node); | |
50 | LTTNG_ASSERT(_key); | |
51 | ||
f139a4f9 | 52 | event = lttng::utils::container_of(node, <tng::sessiond::ust::registry_event::_node); |
d7bfb9b0 JG |
53 | key = (lttng::sessiond::ust::registry_event *) _key; |
54 | ||
55 | /* It has to be a perfect match. First, compare the event names. */ | |
56 | if (event->name != key->name) { | |
57 | goto no_match; | |
58 | } | |
59 | ||
60 | /* Compare log levels. */ | |
61 | if (event->log_level != key->log_level) { | |
62 | goto no_match; | |
63 | } | |
64 | ||
65 | /* Compare the arrays of fields. */ | |
66 | if (*event->payload != *key->payload) { | |
67 | goto no_match; | |
68 | } | |
69 | ||
70 | /* Compare model URI. */ | |
71 | if (event->model_emf_uri != key->model_emf_uri) { | |
72 | goto no_match; | |
73 | } | |
74 | ||
75 | /* Match */ | |
76 | return 1; | |
77 | ||
78 | no_match: | |
79 | return 0; | |
80 | } | |
24ed18f2 | 81 | |
28ab034a JG |
82 | lst::type::cuptr create_event_header(const lst::abi& trace_abi, |
83 | lst::stream_class::header_type header_type) | |
24ed18f2 JG |
84 | { |
85 | lst::structure_type::fields event_header_fields; | |
86 | ||
87 | if (header_type == lst::stream_class::header_type::COMPACT) { | |
88 | auto enum_mappings = std::make_shared<lst::unsigned_enumeration_type::mappings>(); | |
45110cdd | 89 | lst::unsigned_enumeration_type::mapping compact_mapping{ |
28ab034a JG |
90 | "compact", lst::unsigned_enumeration_type::mapping::range_t(0, 30) |
91 | }; | |
92 | lst::unsigned_enumeration_type::mapping extended_mapping{ "extended", 31 }; | |
24ed18f2 | 93 | |
45110cdd JG |
94 | enum_mappings->emplace_back(compact_mapping); |
95 | enum_mappings->emplace_back(extended_mapping); | |
24ed18f2 | 96 | |
28ab034a JG |
97 | lst::type::cuptr choice_enum = lttng::make_unique<lst::unsigned_enumeration_type>( |
98 | 1, | |
99 | trace_abi.byte_order, | |
100 | 5, | |
101 | lst::integer_type::base::DECIMAL, | |
102 | std::move(enum_mappings), | |
103 | std::initializer_list<lst::integer_type::role>( | |
104 | { lst::integer_type::role::EVENT_RECORD_CLASS_ID })); | |
24ed18f2 | 105 | |
28ab034a JG |
106 | lst::variant_type< |
107 | lst::unsigned_enumeration_type::mapping::range_t::range_integer_t>::choices | |
108 | variant_choices; | |
24ed18f2 JG |
109 | |
110 | lst::structure_type::fields compact_fields; | |
28ab034a JG |
111 | compact_fields.emplace_back(lttng::make_unique<lst::field>( |
112 | "timestamp", | |
113 | lttng::make_unique<lst::integer_type>( | |
114 | 1, | |
115 | trace_abi.byte_order, | |
116 | 27, | |
117 | lst::integer_type::signedness::UNSIGNED, | |
118 | lst::integer_type::base::DECIMAL, | |
119 | std::initializer_list<lst::integer_type::role>( | |
120 | { lst::integer_type::role::DEFAULT_CLOCK_TIMESTAMP })))); | |
121 | ||
122 | auto compact_type = | |
123 | lttng::make_unique<lst::structure_type>(0, std::move(compact_fields)); | |
45110cdd | 124 | variant_choices.emplace_back(std::move(compact_mapping), std::move(compact_type)); |
24ed18f2 JG |
125 | |
126 | lst::structure_type::fields extended_fields; | |
28ab034a JG |
127 | extended_fields.emplace_back(lttng::make_unique<lst::field>( |
128 | "id", | |
129 | lttng::make_unique<lst::integer_type>( | |
130 | trace_abi.uint32_t_alignment, | |
131 | trace_abi.byte_order, | |
132 | 32, | |
133 | lst::integer_type::signedness::UNSIGNED, | |
134 | lst::integer_type::base::DECIMAL, | |
135 | std::initializer_list<lst::integer_type::role>( | |
136 | { lst::integer_type::role::EVENT_RECORD_CLASS_ID })))); | |
137 | extended_fields.emplace_back(lttng::make_unique<lst::field>( | |
138 | "timestamp", | |
139 | lttng::make_unique<lst::integer_type>( | |
140 | trace_abi.uint64_t_alignment, | |
141 | trace_abi.byte_order, | |
142 | 64, | |
143 | lst::integer_type::signedness::UNSIGNED, | |
144 | lst::integer_type::base::DECIMAL, | |
145 | std::initializer_list<lst::integer_type::role>( | |
146 | { lst::integer_type::role::DEFAULT_CLOCK_TIMESTAMP })))); | |
147 | ||
148 | lst::type::cuptr extended_type = | |
149 | lttng::make_unique<lst::structure_type>(0, std::move(extended_fields)); | |
45110cdd | 150 | variant_choices.emplace_back(std::move(extended_mapping), std::move(extended_type)); |
24ed18f2 | 151 | |
45110cdd | 152 | auto variant = lttng::make_unique<lst::variant_type< |
28ab034a JG |
153 | lst::unsigned_enumeration_type::mapping::range_t::range_integer_t>>( |
154 | 0, | |
155 | lst::field_location(lst::field_location::root::EVENT_RECORD_HEADER, | |
156 | { "id" }), | |
157 | std::move(variant_choices)); | |
24ed18f2 | 158 | |
24ed18f2 | 159 | event_header_fields.emplace_back( |
28ab034a JG |
160 | lttng::make_unique<lst::field>("id", std::move(choice_enum))); |
161 | event_header_fields.emplace_back( | |
162 | lttng::make_unique<lst::field>("v", std::move(variant))); | |
24ed18f2 JG |
163 | } else { |
164 | auto enum_mappings = std::make_shared<lst::unsigned_enumeration_type::mappings>(); | |
28ab034a JG |
165 | lst::unsigned_enumeration_type::mapping compact_mapping{ |
166 | "compact", lst::unsigned_enumeration_type::mapping::range_t(0, 65534) | |
167 | }; | |
168 | lst::unsigned_enumeration_type::mapping extended_mapping{ "extended", 65535 }; | |
45110cdd JG |
169 | enum_mappings->emplace_back(compact_mapping); |
170 | enum_mappings->emplace_back(extended_mapping); | |
24ed18f2 | 171 | |
45110cdd | 172 | auto choice_enum = lttng::make_unique<lst::unsigned_enumeration_type>( |
28ab034a JG |
173 | trace_abi.uint16_t_alignment, |
174 | trace_abi.byte_order, | |
175 | 16, | |
176 | lst::integer_type::base::DECIMAL, | |
177 | std::move(enum_mappings), | |
178 | std::initializer_list<lst::integer_type::role>( | |
179 | { lst::integer_type::role::EVENT_RECORD_CLASS_ID })); | |
180 | ||
181 | lst::variant_type< | |
182 | lst::unsigned_enumeration_type::mapping::range_t::range_integer_t>::choices | |
183 | variant_choices; | |
24ed18f2 JG |
184 | |
185 | lst::structure_type::fields compact_fields; | |
28ab034a JG |
186 | compact_fields.emplace_back(lttng::make_unique<lst::field>( |
187 | "timestamp", | |
188 | lttng::make_unique<lst::integer_type>( | |
189 | trace_abi.uint32_t_alignment, | |
190 | trace_abi.byte_order, | |
191 | 32, | |
192 | lst::integer_type::signedness::UNSIGNED, | |
193 | lst::integer_type::base::DECIMAL, | |
194 | std::initializer_list<lst::integer_type::role>( | |
195 | { lst::integer_type::role::DEFAULT_CLOCK_TIMESTAMP })))); | |
196 | ||
197 | lst::type::cuptr compact_type = | |
198 | lttng::make_unique<lst::structure_type>(0, std::move(compact_fields)); | |
45110cdd | 199 | variant_choices.emplace_back(std::move(compact_mapping), std::move(compact_type)); |
24ed18f2 JG |
200 | |
201 | lst::structure_type::fields extended_fields; | |
28ab034a JG |
202 | extended_fields.emplace_back(lttng::make_unique<lst::field>( |
203 | "id", | |
204 | lttng::make_unique<lst::integer_type>( | |
205 | trace_abi.uint32_t_alignment, | |
206 | trace_abi.byte_order, | |
207 | 32, | |
208 | lst::integer_type::signedness::UNSIGNED, | |
209 | lst::integer_type::base::DECIMAL, | |
210 | std::initializer_list<lst::integer_type::role>( | |
211 | { lst::integer_type::role::EVENT_RECORD_CLASS_ID })))); | |
212 | extended_fields.emplace_back(lttng::make_unique<lst::field>( | |
213 | "timestamp", | |
214 | lttng::make_unique<lst::integer_type>( | |
215 | trace_abi.uint64_t_alignment, | |
216 | trace_abi.byte_order, | |
217 | 64, | |
218 | lst::integer_type::signedness::UNSIGNED, | |
219 | lst::integer_type::base::DECIMAL, | |
220 | std::initializer_list<lst::integer_type::role>( | |
221 | { lst::integer_type::role::DEFAULT_CLOCK_TIMESTAMP })))); | |
222 | ||
223 | auto extended_type = | |
224 | lttng::make_unique<lst::structure_type>(0, std::move(extended_fields)); | |
45110cdd | 225 | variant_choices.emplace_back(std::move(extended_mapping), std::move(extended_type)); |
24ed18f2 | 226 | |
45110cdd | 227 | auto variant = lttng::make_unique<lst::variant_type< |
28ab034a JG |
228 | lst::unsigned_enumeration_type::mapping::range_t::range_integer_t>>( |
229 | 0, | |
230 | lst::field_location(lst::field_location::root::EVENT_RECORD_HEADER, | |
231 | { "id" }), | |
232 | std::move(variant_choices)); | |
24ed18f2 | 233 | |
45110cdd | 234 | event_header_fields.emplace_back( |
28ab034a | 235 | lttng::make_unique<lst::field>("id", std::move(choice_enum))); |
24ed18f2 | 236 | event_header_fields.emplace_back( |
28ab034a | 237 | lttng::make_unique<lst::field>("v", std::move(variant))); |
24ed18f2 JG |
238 | } |
239 | ||
240 | return lttng::make_unique<lst::structure_type>(0, std::move(event_header_fields)); | |
241 | } | |
242 | ||
243 | lst::type::cuptr create_packet_context(const lst::abi& trace_abi) | |
244 | { | |
245 | lst::structure_type::fields packet_context_fields; | |
246 | ||
247 | /* uint64_t timestamp_begin */ | |
28ab034a JG |
248 | packet_context_fields.emplace_back(lttng::make_unique<lst::field>( |
249 | "timestamp_begin", | |
250 | lttng::make_unique<lst::integer_type>( | |
251 | trace_abi.uint64_t_alignment, | |
252 | trace_abi.byte_order, | |
253 | 64, | |
254 | lst::integer_type::signedness::UNSIGNED, | |
255 | lst::integer_type::base::DECIMAL, | |
256 | std::initializer_list<lst::integer_type::role>( | |
257 | { lst::integer_type::role::DEFAULT_CLOCK_TIMESTAMP })))); | |
24ed18f2 JG |
258 | |
259 | /* uint64_t timestamp_end */ | |
28ab034a JG |
260 | packet_context_fields.emplace_back(lttng::make_unique<lst::field>( |
261 | "timestamp_end", | |
262 | lttng::make_unique<lst::integer_type>( | |
263 | trace_abi.uint64_t_alignment, | |
264 | trace_abi.byte_order, | |
265 | 64, | |
266 | lst::integer_type::signedness::UNSIGNED, | |
267 | lst::integer_type::base::DECIMAL, | |
268 | std::initializer_list<lst::integer_type::role>( | |
269 | { lst::integer_type::role::PACKET_END_DEFAULT_CLOCK_TIMESTAMP })))); | |
24ed18f2 JG |
270 | |
271 | /* uint64_t content_size */ | |
28ab034a JG |
272 | packet_context_fields.emplace_back(lttng::make_unique<lst::field>( |
273 | "content_size", | |
274 | lttng::make_unique<lst::integer_type>( | |
275 | trace_abi.uint64_t_alignment, | |
276 | trace_abi.byte_order, | |
277 | 64, | |
278 | lst::integer_type::signedness::UNSIGNED, | |
279 | lst::integer_type::base::DECIMAL, | |
280 | std::initializer_list<lst::integer_type::role>( | |
281 | { lst::integer_type::role::PACKET_CONTENT_LENGTH })))); | |
24ed18f2 JG |
282 | |
283 | /* uint64_t packet_size */ | |
28ab034a JG |
284 | packet_context_fields.emplace_back(lttng::make_unique<lst::field>( |
285 | "packet_size", | |
286 | lttng::make_unique<lst::integer_type>( | |
287 | trace_abi.uint64_t_alignment, | |
288 | trace_abi.byte_order, | |
289 | 64, | |
290 | lst::integer_type::signedness::UNSIGNED, | |
291 | lst::integer_type::base::DECIMAL, | |
292 | std::initializer_list<lst::integer_type::role>( | |
293 | { lst::integer_type::role::PACKET_TOTAL_LENGTH })))); | |
24ed18f2 JG |
294 | |
295 | /* uint64_t packet_seq_num */ | |
28ab034a JG |
296 | packet_context_fields.emplace_back(lttng::make_unique<lst::field>( |
297 | "packet_seq_num", | |
298 | lttng::make_unique<lst::integer_type>( | |
299 | trace_abi.uint64_t_alignment, | |
300 | trace_abi.byte_order, | |
301 | 64, | |
302 | lst::integer_type::signedness::UNSIGNED, | |
303 | lst::integer_type::base::DECIMAL, | |
304 | std::initializer_list<lst::integer_type::role>( | |
305 | { lst::integer_type::role::PACKET_SEQUENCE_NUMBER })))); | |
24ed18f2 JG |
306 | |
307 | /* unsigned long events_discarded */ | |
28ab034a JG |
308 | packet_context_fields.emplace_back(lttng::make_unique<lst::field>( |
309 | "events_discarded", | |
310 | lttng::make_unique<lst::integer_type>( | |
311 | trace_abi.long_alignment, | |
312 | trace_abi.byte_order, | |
313 | trace_abi.bits_per_long, | |
314 | lst::integer_type::signedness::UNSIGNED, | |
315 | lst::integer_type::base::DECIMAL, | |
316 | std::initializer_list<lst::integer_type::role>( | |
317 | { lst::integer_type::role:: | |
318 | DISCARDED_EVENT_RECORD_COUNTER_SNAPSHOT })))); | |
24ed18f2 JG |
319 | |
320 | /* uint32_t cpu_id */ | |
28ab034a JG |
321 | packet_context_fields.emplace_back(lttng::make_unique<lst::field>( |
322 | "cpu_id", | |
323 | lttng::make_unique<lst::integer_type>(trace_abi.uint32_t_alignment, | |
324 | trace_abi.byte_order, | |
325 | 32, | |
326 | lst::integer_type::signedness::UNSIGNED, | |
327 | lst::integer_type::base::DECIMAL))); | |
24ed18f2 JG |
328 | |
329 | return lttng::make_unique<lst::structure_type>(0, std::move(packet_context_fields)); | |
330 | } | |
d7bfb9b0 JG |
331 | }; /* namespace */ |
332 | ||
28ab034a JG |
333 | lsu::registry_channel::registry_channel( |
334 | unsigned int channel_id, | |
335 | const lst::abi& trace_abi, | |
336 | std::string in_default_clock_class_name, | |
337 | lsu::registry_channel::registered_listener_fn channel_registered_listener, | |
338 | lsu::registry_channel::event_added_listener_fn event_added_listener) : | |
24ed18f2 | 339 | lst::stream_class(channel_id, |
28ab034a JG |
340 | lst::stream_class::header_type::LARGE, |
341 | std::move(in_default_clock_class_name)), | |
342 | _key{ -1ULL }, | |
343 | _consumer_key{ -1ULL }, | |
344 | _next_event_id{ 0 }, | |
345 | _is_registered_listener{ channel_registered_listener }, | |
346 | _event_added_listener{ event_added_listener }, | |
347 | _is_registered{ false } | |
d7bfb9b0 JG |
348 | { |
349 | _events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
350 | if (!_events) { | |
351 | LTTNG_THROW_POSIX("Failed to allocate urcu events hash table", ENOMEM); | |
352 | } | |
353 | ||
354 | /* Set custom match function. */ | |
355 | _events->match_fct = ht_match_event; | |
356 | _events->hash_fct = ht_hash_event; | |
36038679 JG |
357 | |
358 | _rcu_head = {}; | |
359 | /* | |
360 | * Node's key is initialized by the channel's parent session. Its value is irrelevant to the | |
361 | * channel object itself. | |
362 | */ | |
363 | _node = {}; | |
24ed18f2 JG |
364 | |
365 | _packet_context = create_packet_context(trace_abi); | |
366 | _event_header = create_event_header(trace_abi, header_type_); | |
d7bfb9b0 JG |
367 | } |
368 | ||
28ab034a JG |
369 | void lsu::registry_channel::add_event(int session_objd, |
370 | int channel_objd, | |
371 | std::string name, | |
372 | std::string signature, | |
373 | std::vector<lst::field::cuptr> event_fields, | |
374 | int loglevel_value, | |
375 | nonstd::optional<std::string> model_emf_uri, | |
376 | lttng_buffer_type buffer_type, | |
377 | const ust_app& app, | |
378 | uint32_t& out_event_id) | |
d7bfb9b0 JG |
379 | { |
380 | uint32_t event_id; | |
381 | struct cds_lfht_node *nptr; | |
382 | lttng::urcu::read_lock_guard read_lock_guard; | |
383 | ||
384 | /* | |
385 | * This should not happen but since it comes from the UST tracer, an | |
386 | * external party, don't assert and simply validate values. | |
387 | */ | |
388 | if (session_objd < 0) { | |
389 | LTTNG_THROW_INVALID_ARGUMENT_ERROR(fmt::format( | |
28ab034a JG |
390 | "Invalid session object descriptor provided by application: session descriptor = {}, app = {}", |
391 | session_objd, | |
392 | app)); | |
d7bfb9b0 JG |
393 | } |
394 | ||
395 | if (channel_objd < 0) { | |
396 | LTTNG_THROW_INVALID_ARGUMENT_ERROR(fmt::format( | |
28ab034a JG |
397 | "Invalid channel object descriptor provided by application: channel descriptor = {}, app = {}", |
398 | channel_objd, | |
399 | app)); | |
d7bfb9b0 JG |
400 | } |
401 | ||
402 | /* Check if we've reached the maximum possible id. */ | |
403 | if (is_max_event_id(_next_event_id)) { | |
404 | LTTNG_THROW_ERROR(fmt::format( | |
28ab034a | 405 | "Failed to allocate new event id (id would overflow): app = {}", app)); |
d7bfb9b0 JG |
406 | } |
407 | ||
408 | auto event = lttng::make_unique_wrapper<lsu::registry_event, registry_event_destroy>( | |
28ab034a JG |
409 | new lsu::registry_event(_next_event_id, |
410 | id, | |
411 | session_objd, | |
412 | channel_objd, | |
413 | std::move(name), | |
414 | std::move(signature), | |
415 | std::move(event_fields), | |
416 | loglevel_value, | |
d7bfb9b0 JG |
417 | std::move(model_emf_uri))); |
418 | ||
419 | DBG3("%s", fmt::format("UST registry creating event: event = {}", *event).c_str()); | |
420 | ||
421 | /* | |
422 | * This is an add unique with a custom match function for event. The node | |
423 | * are matched using the event name and signature. | |
424 | */ | |
28ab034a JG |
425 | nptr = cds_lfht_add_unique(_events->ht, |
426 | _events->hash_fct(event.get(), lttng_ht_seed), | |
427 | _events->match_fct, | |
428 | event.get(), | |
429 | &event->_node); | |
f139a4f9 | 430 | if (nptr != &event->_node) { |
d7bfb9b0 JG |
431 | if (buffer_type == LTTNG_BUFFER_PER_UID) { |
432 | /* | |
433 | * This is normal, we just have to send the event id of the | |
434 | * returned node. | |
435 | */ | |
f139a4f9 | 436 | const auto existing_event = lttng::utils::container_of( |
28ab034a | 437 | nptr, <tng::sessiond::ust::registry_event::_node); |
d7bfb9b0 JG |
438 | event_id = existing_event->id; |
439 | } else { | |
440 | LTTNG_THROW_INVALID_ARGUMENT_ERROR(fmt::format( | |
28ab034a JG |
441 | "UST registry create event add unique failed for event: event = {}", |
442 | *event)); | |
d7bfb9b0 JG |
443 | } |
444 | } else { | |
445 | const auto& event_ref = *event; | |
446 | ||
447 | /* Ownership transferred to _events hash table. */ | |
448 | event.release(); | |
449 | ||
450 | /* Request next event id if the node was successfully added. */ | |
451 | event_id = event_ref.id; | |
452 | ||
453 | /* | |
454 | * Only increment the next id here since we don't want to waste an ID when the event | |
455 | * matches an existing one. | |
456 | */ | |
457 | _next_event_id++; | |
458 | _event_added_listener(*this, event_ref); | |
459 | } | |
460 | ||
461 | out_event_id = event_id; | |
462 | } | |
463 | ||
464 | lsu::registry_channel::~registry_channel() | |
465 | { | |
466 | lttng_ht_destroy(_events); | |
467 | } | |
468 | ||
28ab034a | 469 | const lttng::sessiond::trace::type *lsu::registry_channel::event_context() const |
d7bfb9b0 JG |
470 | { |
471 | LTTNG_ASSERT(_is_registered); | |
4bcf2294 | 472 | return lst::stream_class::event_context(); |
d7bfb9b0 JG |
473 | } |
474 | ||
4bcf2294 | 475 | void lsu::registry_channel::event_context(lttng::sessiond::trace::type::cuptr context) |
d7bfb9b0 JG |
476 | { |
477 | /* Must only be set once, on the first channel registration provided by an application. */ | |
24ed18f2 JG |
478 | LTTNG_ASSERT(!_event_context); |
479 | _event_context = std::move(context); | |
d7bfb9b0 JG |
480 | } |
481 | ||
482 | bool lsu::registry_channel::is_registered() const | |
483 | { | |
484 | return _is_registered; | |
485 | } | |
486 | ||
487 | void lsu::registry_channel::set_as_registered() | |
488 | { | |
489 | if (!_is_registered) { | |
490 | _is_registered = true; | |
491 | _is_registered_listener(*this); | |
492 | } | |
493 | } | |
494 | ||
495 | void lsu::registry_channel::_accept_on_event_classes( | |
28ab034a | 496 | lttng::sessiond::trace::trace_class_visitor& visitor) const |
d7bfb9b0 JG |
497 | { |
498 | std::vector<const lttng::sessiond::ust::registry_event *> sorted_event_classes; | |
499 | ||
500 | { | |
501 | lttng::urcu::read_lock_guard read_lock_guard; | |
502 | struct lttng_ht_iter iter; | |
503 | const lttng::sessiond::ust::registry_event *event; | |
504 | ||
505 | DIAGNOSTIC_PUSH | |
506 | DIAGNOSTIC_IGNORE_INVALID_OFFSETOF | |
28ab034a | 507 | cds_lfht_for_each_entry (_events->ht, &iter.iter, event, _node) { |
d7bfb9b0 JG |
508 | sorted_event_classes.emplace_back(event); |
509 | } | |
510 | DIAGNOSTIC_POP | |
511 | } | |
512 | ||
28ab034a JG |
513 | std::sort(sorted_event_classes.begin(), |
514 | sorted_event_classes.end(), | |
515 | [](const lttng::sessiond::ust::registry_event *a, | |
516 | const lttng::sessiond::ust::registry_event *b) { return a->id < b->id; }); | |
d7bfb9b0 JG |
517 | |
518 | for (const auto event : sorted_event_classes) { | |
519 | event->accept(visitor); | |
520 | } | |
521 | } |