| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright (C) 2010-2019 EfficiOS Inc. and Linux Foundation |
| 5 | */ |
| 6 | |
| 7 | #ifndef BABELTRACE2_TRACE_IR_STREAM_H |
| 8 | #define BABELTRACE2_TRACE_IR_STREAM_H |
| 9 | |
| 10 | /* IWYU pragma: private, include <babeltrace2/babeltrace.h> */ |
| 11 | |
| 12 | #ifndef __BT_IN_BABELTRACE_H |
| 13 | # error "Please include <babeltrace2/babeltrace.h> instead." |
| 14 | #endif |
| 15 | |
| 16 | #include <stdint.h> |
| 17 | |
| 18 | #include <babeltrace2/types.h> |
| 19 | |
| 20 | #ifdef __cplusplus |
| 21 | extern "C" { |
| 22 | #endif |
| 23 | |
| 24 | /*! |
| 25 | @defgroup api-tir-stream Stream |
| 26 | @ingroup api-tir |
| 27 | |
| 28 | @brief |
| 29 | Trace stream. |
| 30 | |
| 31 | A <strong><em>stream</em></strong> is a conceptual |
| 32 | \ref api-msg-seq "sequence of messages" within a \bt_trace: |
| 33 | |
| 34 | @image html trace-structure.png |
| 35 | |
| 36 | In the illustration above, notice that: |
| 37 | |
| 38 | - A \bt_stream is a conceptual sequence of \bt_p_msg. |
| 39 | |
| 40 | The sequence always starts with a \bt_sb_msg and ends with a |
| 41 | \bt_se_msg. |
| 42 | |
| 43 | - A stream is an instance of a \bt_stream_cls. |
| 44 | |
| 45 | - A \bt_trace contains one or more streams. |
| 46 | |
| 47 | A stream is a \ref api-tir "trace IR" data object. |
| 48 | |
| 49 | A stream is said to be a \em conceptual sequence of messages because the |
| 50 | stream object itself does not contain messages: it only represents a |
| 51 | common timeline to which messages are associated. |
| 52 | |
| 53 | \bt_cp_comp exchange messages, within a trace processing \bt_graph, |
| 54 | which can belong to different streams, as long as the stream clocks are |
| 55 | \ref api-tir-clock-cls-origin "correlatable". |
| 56 | |
| 57 | A typical use case for streams is to use one for each traced CPU. Then |
| 58 | the messages related to a given stream are the ones which occurred on a |
| 59 | given CPU. Other schemes are possible: they are completely |
| 60 | application-specific, and \bt_name does not enforce any specific |
| 61 | stream arrangement pattern. |
| 62 | |
| 63 | A \bt_trace contains streams. All the streams of a |
| 64 | given trace, for a given stream class, have unique numeric IDs. Borrow |
| 65 | the trace which contains a stream with bt_stream_borrow_trace() or |
| 66 | bt_stream_borrow_trace_const(). |
| 67 | |
| 68 | A \bt_stream can conceptually contain a default clock if its class |
| 69 | has a \ref api-tir-stream-cls-prop-def-clock-cls "default clock class". |
| 70 | There's no function to access a stream's default clock because it's |
| 71 | a stateful object: \bt_p_msg cannot refer to stateful objects |
| 72 | because they must not change while being transported from one |
| 73 | \bt_comp to the other. Instead of having a stream default clock object, |
| 74 | \bt_p_msg have a default \bt_cs: this is a snapshot of the value of a |
| 75 | stream's default clock (a \bt_clock_cls instance): |
| 76 | |
| 77 | @image html clocks.png |
| 78 | |
| 79 | In the illustration above, notice that: |
| 80 | |
| 81 | - Streams (horizontal blue rectangles) are instances of a |
| 82 | \bt_stream_cls (orange). |
| 83 | |
| 84 | - A stream class has a default \bt_clock_cls (orange bell alarm clock). |
| 85 | |
| 86 | - Each stream has a default clock (yellow bell alarm clock): this is an |
| 87 | instance of the stream's class's default clock class. |
| 88 | |
| 89 | - Each \bt_msg (objects in blue stream rectangles) created for a given |
| 90 | stream has a default \bt_cs (yellow star): this is a snapshot of the |
| 91 | stream's default clock. |
| 92 | |
| 93 | In other words, a default clock snapshot contains the value of the |
| 94 | stream's default clock when this message occurred. |
| 95 | |
| 96 | To create a stream: |
| 97 | |
| 98 | <dl> |
| 99 | <dt> |
| 100 | If bt_stream_class_assigns_automatic_stream_id() returns |
| 101 | #BT_TRUE (the default) for the stream class to use |
| 102 | </dt> |
| 103 | <dd>Use bt_stream_create().</dd> |
| 104 | |
| 105 | <dt> |
| 106 | If bt_stream_class_assigns_automatic_stream_id() returns |
| 107 | #BT_FALSE for the stream class to use |
| 108 | </dt> |
| 109 | <dd>Use bt_stream_create_with_id().</dd> |
| 110 | </dl> |
| 111 | |
| 112 | A stream is a \ref api-fund-shared-object "shared object": get a |
| 113 | new reference with bt_stream_get_ref() and put an existing |
| 114 | reference with bt_stream_put_ref(). |
| 115 | |
| 116 | Some library functions \ref api-fund-freezing "freeze" streams on |
| 117 | success. The documentation of those functions indicate this |
| 118 | postcondition. |
| 119 | |
| 120 | The type of a stream is #bt_stream. |
| 121 | |
| 122 | <h1>Properties</h1> |
| 123 | |
| 124 | A stream has the following property: |
| 125 | |
| 126 | <dl> |
| 127 | <dt>\anchor api-tir-stream-prop-id Numeric ID</dt> |
| 128 | <dd> |
| 129 | Numeric ID, unique amongst the numeric IDs of the stream's |
| 130 | \bt_trace's streams for a given \bt_stream_cls. In other words, |
| 131 | two streams which belong to the same trace can have the same numeric |
| 132 | ID if they aren't instances of the same class. |
| 133 | |
| 134 | Depending on whether or not the stream's class |
| 135 | automatically assigns stream IDs |
| 136 | (see bt_stream_class_assigns_automatic_stream_id()), |
| 137 | set the stream's numeric ID on creation with |
| 138 | bt_stream_create() or bt_stream_create_with_id(). |
| 139 | |
| 140 | You cannot change the numeric ID once the stream is created. |
| 141 | |
| 142 | Get a stream's numeric ID with bt_stream_get_id(). |
| 143 | </dd> |
| 144 | |
| 145 | <dt>\anchor api-tir-stream-prop-name \bt_dt_opt Name</dt> |
| 146 | <dd> |
| 147 | Name of the stream. |
| 148 | |
| 149 | Use bt_stream_set_name() and bt_stream_get_name(). |
| 150 | </dd> |
| 151 | |
| 152 | <dt> |
| 153 | \anchor api-tir-stream-prop-user-attrs |
| 154 | \bt_dt_opt User attributes |
| 155 | </dt> |
| 156 | <dd> |
| 157 | User attributes of the stream. |
| 158 | |
| 159 | User attributes are custom attributes attached to a stream. |
| 160 | |
| 161 | Use bt_stream_set_user_attributes(), |
| 162 | bt_stream_borrow_user_attributes(), and |
| 163 | bt_stream_borrow_user_attributes_const(). |
| 164 | </dd> |
| 165 | </dl> |
| 166 | */ |
| 167 | |
| 168 | /*! @{ */ |
| 169 | |
| 170 | /*! |
| 171 | @name Type |
| 172 | @{ |
| 173 | |
| 174 | @typedef struct bt_stream bt_stream; |
| 175 | |
| 176 | @brief |
| 177 | Stream. |
| 178 | |
| 179 | @} |
| 180 | */ |
| 181 | |
| 182 | /*! |
| 183 | @name Creation |
| 184 | @{ |
| 185 | */ |
| 186 | |
| 187 | /*! |
| 188 | @brief |
| 189 | Creates a stream from the \bt_stream_cls \bt_p{stream_class} and |
| 190 | adds it to the \bt_trace \bt_p{trace}. |
| 191 | |
| 192 | This function instantiates \bt_p{stream_class}. |
| 193 | |
| 194 | @attention |
| 195 | @parblock |
| 196 | Only use this function if |
| 197 | |
| 198 | @code |
| 199 | bt_stream_class_assigns_automatic_stream_id(stream_class) |
| 200 | @endcode |
| 201 | |
| 202 | returns #BT_TRUE. |
| 203 | |
| 204 | Otherwise, use bt_stream_create_with_id(). |
| 205 | @endparblock |
| 206 | |
| 207 | On success, the returned stream has the following property values: |
| 208 | |
| 209 | <table> |
| 210 | <tr> |
| 211 | <th>Property |
| 212 | <th>Value |
| 213 | <tr> |
| 214 | <td>\ref api-tir-stream-prop-id "Numeric ID" |
| 215 | <td>Automatically assigned by \bt_p{stream_class} and \bt_p{trace} |
| 216 | <tr> |
| 217 | <td>\ref api-tir-stream-prop-name "Name" |
| 218 | <td>\em None |
| 219 | <tr> |
| 220 | <td>\ref api-tir-stream-prop-user-attrs "User attributes" |
| 221 | <td>Empty \bt_map_val |
| 222 | </table> |
| 223 | |
| 224 | @param[in] stream_class |
| 225 | Stream class from which to create the stream. |
| 226 | @param[in] trace |
| 227 | Trace to add the created stream to. |
| 228 | |
| 229 | @returns |
| 230 | New stream reference, or \c NULL on memory error. |
| 231 | |
| 232 | @bt_pre_not_null{stream_class} |
| 233 | @pre |
| 234 | <code>bt_stream_class_assigns_automatic_stream_id(stream_class)</code> |
| 235 | returns #BT_TRUE. |
| 236 | @bt_pre_not_null{trace} |
| 237 | |
| 238 | @bt_post_success_frozen{stream_class} |
| 239 | @bt_post_success_frozen{trace} |
| 240 | |
| 241 | @sa bt_stream_create_with_id() — |
| 242 | Creates a stream with a specific numeric ID and adds it to a |
| 243 | trace. |
| 244 | */ |
| 245 | extern bt_stream *bt_stream_create(bt_stream_class *stream_class, |
| 246 | bt_trace *trace) __BT_NOEXCEPT; |
| 247 | |
| 248 | /*! |
| 249 | @brief |
| 250 | Creates a stream with the numeric ID \bt_p{id} |
| 251 | from the \bt_stream_cls \bt_p{stream_class} and adds |
| 252 | it to the \bt_trace \bt_p{trace}. |
| 253 | |
| 254 | This function instantiates \bt_p{stream_class}. |
| 255 | |
| 256 | @attention |
| 257 | @parblock |
| 258 | Only use this function if |
| 259 | |
| 260 | @code |
| 261 | bt_stream_class_assigns_automatic_stream_id(stream_class) |
| 262 | @endcode |
| 263 | |
| 264 | returns #BT_FALSE. |
| 265 | |
| 266 | Otherwise, use bt_stream_create(). |
| 267 | @endparblock |
| 268 | |
| 269 | On success, the returned stream has the following property values: |
| 270 | |
| 271 | <table> |
| 272 | <tr> |
| 273 | <th>Property |
| 274 | <th>Value |
| 275 | <tr> |
| 276 | <td>\ref api-tir-stream-prop-id "Numeric ID" |
| 277 | <td>\bt_p{id} |
| 278 | <tr> |
| 279 | <td>\ref api-tir-stream-prop-name "Name" |
| 280 | <td>\em None |
| 281 | <tr> |
| 282 | <td>\ref api-tir-stream-prop-user-attrs "User attributes" |
| 283 | <td>Empty \bt_map_val |
| 284 | </table> |
| 285 | |
| 286 | @param[in] stream_class |
| 287 | Stream class from which to create the stream. |
| 288 | @param[in] trace |
| 289 | Trace to add the created stream to. |
| 290 | @param[in] id |
| 291 | Numeric ID of the stream to create and add to \bt_p{trace}. |
| 292 | |
| 293 | @returns |
| 294 | New stream reference, or \c NULL on memory error. |
| 295 | |
| 296 | @bt_pre_not_null{stream_class} |
| 297 | @pre |
| 298 | <code>bt_stream_class_assigns_automatic_stream_id(stream_class)</code> |
| 299 | returns #BT_FALSE. |
| 300 | @bt_pre_not_null{trace} |
| 301 | @pre |
| 302 | \bt_p{trace} does not contain an instance of \bt_p{stream_class} |
| 303 | with the numeric ID \bt_p{id}. |
| 304 | |
| 305 | @bt_post_success_frozen{stream_class} |
| 306 | @bt_post_success_frozen{trace} |
| 307 | |
| 308 | @sa bt_stream_create() — |
| 309 | Creates a stream with an automatic numeric ID and adds it to a |
| 310 | trace. |
| 311 | */ |
| 312 | extern bt_stream *bt_stream_create_with_id( |
| 313 | bt_stream_class *stream_class, |
| 314 | bt_trace *trace, uint64_t id) __BT_NOEXCEPT; |
| 315 | |
| 316 | /*! @} */ |
| 317 | |
| 318 | /*! |
| 319 | @name Class access |
| 320 | @{ |
| 321 | */ |
| 322 | |
| 323 | /*! |
| 324 | @brief |
| 325 | Borrows the \ref api-tir-stream-cls "class" of the stream |
| 326 | \bt_p{stream}. |
| 327 | |
| 328 | @param[in] stream |
| 329 | Stream of which to borrow the class. |
| 330 | |
| 331 | @returns |
| 332 | \em Borrowed reference of the class of \bt_p{stream}. |
| 333 | |
| 334 | @bt_pre_not_null{stream} |
| 335 | |
| 336 | @sa bt_stream_borrow_class_const() — |
| 337 | \c const version of this function. |
| 338 | */ |
| 339 | extern bt_stream_class *bt_stream_borrow_class(bt_stream *stream) __BT_NOEXCEPT; |
| 340 | |
| 341 | /*! |
| 342 | @brief |
| 343 | Borrows the \ref api-tir-stream-cls "class" of the stream |
| 344 | \bt_p{stream} (\c const version). |
| 345 | |
| 346 | See bt_stream_borrow_class(). |
| 347 | */ |
| 348 | extern const bt_stream_class *bt_stream_borrow_class_const( |
| 349 | const bt_stream *stream) __BT_NOEXCEPT; |
| 350 | |
| 351 | /*! @} */ |
| 352 | |
| 353 | /*! |
| 354 | @name Trace access |
| 355 | @{ |
| 356 | */ |
| 357 | |
| 358 | /*! |
| 359 | @brief |
| 360 | Borrows the \bt_trace which contains the stream \bt_p{stream}. |
| 361 | |
| 362 | @param[in] stream |
| 363 | Stream of which to borrow the trace containing it. |
| 364 | |
| 365 | @returns |
| 366 | \em Borrowed reference of the trace containing \bt_p{stream}. |
| 367 | |
| 368 | @bt_pre_not_null{stream} |
| 369 | |
| 370 | @sa bt_stream_borrow_trace_const() — |
| 371 | \c const version of this function. |
| 372 | */ |
| 373 | extern bt_trace *bt_stream_borrow_trace(bt_stream *stream) __BT_NOEXCEPT; |
| 374 | |
| 375 | /*! |
| 376 | @brief |
| 377 | Borrows the \bt_trace which contains the stream \bt_p{stream} |
| 378 | (\c const version). |
| 379 | |
| 380 | See bt_stream_borrow_trace(). |
| 381 | */ |
| 382 | extern const bt_trace *bt_stream_borrow_trace_const( |
| 383 | const bt_stream *stream) __BT_NOEXCEPT; |
| 384 | |
| 385 | /*! @} */ |
| 386 | |
| 387 | /*! |
| 388 | @name Properties |
| 389 | @{ |
| 390 | */ |
| 391 | |
| 392 | /*! |
| 393 | @brief |
| 394 | Returns the numeric ID of the stream \bt_p{stream}. |
| 395 | |
| 396 | See the \ref api-tir-stream-prop-id "numeric ID" property. |
| 397 | |
| 398 | @param[in] stream |
| 399 | Stream of which to get the numeric ID. |
| 400 | |
| 401 | @returns |
| 402 | Numeric ID of \bt_p{stream}. |
| 403 | |
| 404 | @bt_pre_not_null{stream} |
| 405 | |
| 406 | @sa bt_stream_create_with_id() — |
| 407 | Creates a stream with a specific numeric ID and adds it to a |
| 408 | trace. |
| 409 | */ |
| 410 | extern uint64_t bt_stream_get_id(const bt_stream *stream) __BT_NOEXCEPT; |
| 411 | |
| 412 | /*! |
| 413 | @brief |
| 414 | Status codes for bt_stream_set_name(). |
| 415 | */ |
| 416 | typedef enum bt_stream_set_name_status { |
| 417 | /*! |
| 418 | @brief |
| 419 | Success. |
| 420 | */ |
| 421 | BT_STREAM_SET_NAME_STATUS_OK = __BT_FUNC_STATUS_OK, |
| 422 | |
| 423 | /*! |
| 424 | @brief |
| 425 | Out of memory. |
| 426 | */ |
| 427 | BT_STREAM_SET_NAME_STATUS_MEMORY_ERROR = __BT_FUNC_STATUS_MEMORY_ERROR, |
| 428 | } bt_stream_set_name_status; |
| 429 | |
| 430 | /*! |
| 431 | @brief |
| 432 | Sets the name of the stream \bt_p{stream} to |
| 433 | a copy of \bt_p{name}. |
| 434 | |
| 435 | See the \ref api-tir-stream-prop-name "name" property. |
| 436 | |
| 437 | @param[in] stream |
| 438 | Stream of which to set the name to \bt_p{name}. |
| 439 | @param[in] name |
| 440 | New name of \bt_p{stream} (copied). |
| 441 | |
| 442 | @retval #BT_STREAM_CLASS_SET_NAME_STATUS_OK |
| 443 | Success. |
| 444 | @retval #BT_STREAM_CLASS_SET_NAME_STATUS_MEMORY_ERROR |
| 445 | Out of memory. |
| 446 | |
| 447 | @bt_pre_not_null{stream} |
| 448 | @bt_pre_hot{stream} |
| 449 | @bt_pre_not_null{name} |
| 450 | |
| 451 | @sa bt_stream_get_name() — |
| 452 | Returns the name of a stream. |
| 453 | */ |
| 454 | extern bt_stream_set_name_status bt_stream_set_name(bt_stream *stream, |
| 455 | const char *name) __BT_NOEXCEPT; |
| 456 | |
| 457 | /*! |
| 458 | @brief |
| 459 | Returns the name of the stream \bt_p{stream}. |
| 460 | |
| 461 | See the \ref api-tir-stream-prop-name "name" property. |
| 462 | |
| 463 | If \bt_p{stream} has no name, this function returns \c NULL. |
| 464 | |
| 465 | @param[in] stream |
| 466 | Stream of which to get the name. |
| 467 | |
| 468 | @returns |
| 469 | @parblock |
| 470 | Name of \bt_p{stream}, or \c NULL if none. |
| 471 | |
| 472 | The returned pointer remains valid as long as \bt_p{stream} |
| 473 | is not modified. |
| 474 | @endparblock |
| 475 | |
| 476 | @bt_pre_not_null{stream} |
| 477 | |
| 478 | @sa bt_stream_class_set_name() — |
| 479 | Sets the name of a stream. |
| 480 | */ |
| 481 | extern const char *bt_stream_get_name(const bt_stream *stream) __BT_NOEXCEPT; |
| 482 | |
| 483 | /*! |
| 484 | @brief |
| 485 | Sets the user attributes of the stream \bt_p{stream} to |
| 486 | \bt_p{user_attributes}. |
| 487 | |
| 488 | See the \ref api-tir-stream-prop-user-attrs "user attributes" |
| 489 | property. |
| 490 | |
| 491 | @note |
| 492 | When you create a default stream with bt_stream_create() |
| 493 | or bt_stream_create_with_id(), the stream's initial user |
| 494 | attributes is an empty \bt_map_val. Therefore you can borrow it with |
| 495 | bt_stream_borrow_user_attributes() and fill it directly |
| 496 | instead of setting a new one with this function. |
| 497 | |
| 498 | @param[in] stream |
| 499 | Stream of which to set the user attributes to |
| 500 | \bt_p{user_attributes}. |
| 501 | @param[in] user_attributes |
| 502 | New user attributes of \bt_p{stream}. |
| 503 | |
| 504 | @bt_pre_not_null{stream} |
| 505 | @bt_pre_hot{stream} |
| 506 | @bt_pre_not_null{user_attributes} |
| 507 | @bt_pre_is_map_val{user_attributes} |
| 508 | |
| 509 | @sa bt_stream_borrow_user_attributes() — |
| 510 | Borrows the user attributes of a stream. |
| 511 | */ |
| 512 | extern void bt_stream_set_user_attributes( |
| 513 | bt_stream *stream, const bt_value *user_attributes) |
| 514 | __BT_NOEXCEPT; |
| 515 | |
| 516 | /*! |
| 517 | @brief |
| 518 | Borrows the user attributes of the stream \bt_p{stream}. |
| 519 | |
| 520 | See the \ref api-tir-stream-prop-user-attrs "user attributes" |
| 521 | property. |
| 522 | |
| 523 | @note |
| 524 | When you create a default stream with bt_stream_create() |
| 525 | or bt_stream_create_with_id(), the stream's initial user |
| 526 | attributes is an empty \bt_map_val. |
| 527 | |
| 528 | @param[in] stream |
| 529 | Stream from which to borrow the user attributes. |
| 530 | |
| 531 | @returns |
| 532 | User attributes of \bt_p{stream} (a \bt_map_val). |
| 533 | |
| 534 | @bt_pre_not_null{stream} |
| 535 | |
| 536 | @sa bt_stream_set_user_attributes() — |
| 537 | Sets the user attributes of a stream. |
| 538 | @sa bt_stream_borrow_user_attributes_const() — |
| 539 | \c const version of this function. |
| 540 | */ |
| 541 | extern bt_value *bt_stream_borrow_user_attributes(bt_stream *stream) |
| 542 | __BT_NOEXCEPT; |
| 543 | |
| 544 | /*! |
| 545 | @brief |
| 546 | Borrows the user attributes of the stream \bt_p{stream} |
| 547 | (\c const version). |
| 548 | |
| 549 | See bt_stream_borrow_user_attributes(). |
| 550 | */ |
| 551 | extern const bt_value *bt_stream_borrow_user_attributes_const( |
| 552 | const bt_stream *stream) __BT_NOEXCEPT; |
| 553 | |
| 554 | /*! @} */ |
| 555 | |
| 556 | /*! |
| 557 | @name Reference count |
| 558 | @{ |
| 559 | */ |
| 560 | |
| 561 | /*! |
| 562 | @brief |
| 563 | Increments the \ref api-fund-shared-object "reference count" of |
| 564 | the stream \bt_p{stream}. |
| 565 | |
| 566 | @param[in] stream |
| 567 | @parblock |
| 568 | Stream of which to increment the reference count. |
| 569 | |
| 570 | Can be \c NULL. |
| 571 | @endparblock |
| 572 | |
| 573 | @sa bt_stream_put_ref() — |
| 574 | Decrements the reference count of a stream. |
| 575 | */ |
| 576 | extern void bt_stream_get_ref(const bt_stream *stream) __BT_NOEXCEPT; |
| 577 | |
| 578 | /*! |
| 579 | @brief |
| 580 | Decrements the \ref api-fund-shared-object "reference count" of |
| 581 | the stream \bt_p{stream}. |
| 582 | |
| 583 | @param[in] stream |
| 584 | @parblock |
| 585 | Stream of which to decrement the reference count. |
| 586 | |
| 587 | Can be \c NULL. |
| 588 | @endparblock |
| 589 | |
| 590 | @sa bt_stream_get_ref() — |
| 591 | Increments the reference count of a stream. |
| 592 | */ |
| 593 | extern void bt_stream_put_ref(const bt_stream *stream) __BT_NOEXCEPT; |
| 594 | |
| 595 | /*! |
| 596 | @brief |
| 597 | Decrements the reference count of the stream |
| 598 | \bt_p{_stream}, and then sets \bt_p{_stream} to \c NULL. |
| 599 | |
| 600 | @param _stream |
| 601 | @parblock |
| 602 | Stream of which to decrement the reference count. |
| 603 | |
| 604 | Can contain \c NULL. |
| 605 | @endparblock |
| 606 | |
| 607 | @bt_pre_assign_expr{_stream} |
| 608 | */ |
| 609 | #define BT_STREAM_PUT_REF_AND_RESET(_stream) \ |
| 610 | do { \ |
| 611 | bt_stream_put_ref(_stream); \ |
| 612 | (_stream) = NULL; \ |
| 613 | } while (0) |
| 614 | |
| 615 | /*! |
| 616 | @brief |
| 617 | Decrements the reference count of the stream \bt_p{_dst}, sets |
| 618 | \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to \c NULL. |
| 619 | |
| 620 | This macro effectively moves a stream reference from the expression |
| 621 | \bt_p{_src} to the expression \bt_p{_dst}, putting the existing |
| 622 | \bt_p{_dst} reference. |
| 623 | |
| 624 | @param _dst |
| 625 | @parblock |
| 626 | Destination expression. |
| 627 | |
| 628 | Can contain \c NULL. |
| 629 | @endparblock |
| 630 | @param _src |
| 631 | @parblock |
| 632 | Source expression. |
| 633 | |
| 634 | Can contain \c NULL. |
| 635 | @endparblock |
| 636 | |
| 637 | @bt_pre_assign_expr{_dst} |
| 638 | @bt_pre_assign_expr{_src} |
| 639 | */ |
| 640 | #define BT_STREAM_MOVE_REF(_dst, _src) \ |
| 641 | do { \ |
| 642 | bt_stream_put_ref(_dst); \ |
| 643 | (_dst) = (_src); \ |
| 644 | (_src) = NULL; \ |
| 645 | } while (0) |
| 646 | |
| 647 | /*! @} */ |
| 648 | |
| 649 | /*! @} */ |
| 650 | |
| 651 | #ifdef __cplusplus |
| 652 | } |
| 653 | #endif |
| 654 | |
| 655 | #endif /* BABELTRACE2_TRACE_IR_STREAM_H */ |