| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright (C) 2010-2019 EfficiOS Inc. and Linux Foundation |
| 5 | */ |
| 6 | |
| 7 | #ifndef BABELTRACE2_GRAPH_PORT_H |
| 8 | #define BABELTRACE2_GRAPH_PORT_H |
| 9 | |
| 10 | #ifndef __BT_IN_BABELTRACE_H |
| 11 | # error "Please include <babeltrace2/babeltrace.h> instead." |
| 12 | #endif |
| 13 | |
| 14 | #include <stdint.h> |
| 15 | |
| 16 | #include <babeltrace2/types.h> |
| 17 | |
| 18 | #ifdef __cplusplus |
| 19 | extern "C" { |
| 20 | #endif |
| 21 | |
| 22 | /*! |
| 23 | @defgroup api-port Ports |
| 24 | @ingroup api-comp |
| 25 | |
| 26 | @brief |
| 27 | \bt_c_comp input and output ports. |
| 28 | |
| 29 | A <strong><em>port</em></strong> is a point of \bt_conn between |
| 30 | \bt_p_comp: |
| 31 | |
| 32 | @image html component-zoom.png |
| 33 | |
| 34 | A port is a \ref api-fund-shared-object "shared object": get a new |
| 35 | reference with bt_port_get_ref() and put an existing reference with |
| 36 | bt_port_put_ref(). |
| 37 | |
| 38 | The common C type of a port is #bt_port. |
| 39 | |
| 40 | There are two types of ports: |
| 41 | |
| 42 | <dl> |
| 43 | <dt>\anchor api-port-in Input port</dt> |
| 44 | <dd> |
| 45 | Input connection point from which \bt_p_msg are received. |
| 46 | |
| 47 | Filter and sink components have input ports. |
| 48 | |
| 49 | An input port's specific type is #bt_port_input and its type |
| 50 | enumerator is #BT_PORT_TYPE_INPUT. |
| 51 | |
| 52 | \ref api-fund-c-typing "Upcast" the #bt_port_input type to the |
| 53 | #bt_port type with bt_port_input_as_port_const(). |
| 54 | |
| 55 | Get a new input port reference with bt_port_input_get_ref() and put |
| 56 | an existing one with bt_port_input_put_ref(). |
| 57 | </dd> |
| 58 | |
| 59 | <dt>\anchor api-port-out Output port</dt> |
| 60 | <dd> |
| 61 | Output connection point to which messages are sent. |
| 62 | |
| 63 | Source and filter components have output ports. |
| 64 | |
| 65 | An output port's specific type is #bt_port_output and its type |
| 66 | enumerator is #BT_PORT_TYPE_OUTPUT. |
| 67 | |
| 68 | \ref api-fund-c-typing "Upcast" the #bt_port_output type to the |
| 69 | #bt_port type with bt_port_output_as_port_const(). |
| 70 | |
| 71 | Get a new output port reference with bt_port_output_get_ref() and |
| 72 | put an existing one with bt_port_output_put_ref(). |
| 73 | </dd> |
| 74 | </dl> |
| 75 | |
| 76 | Get a port's type enumerator with bt_port_get_type(). You can also use |
| 77 | the bt_port_is_input() and bt_port_is_output() helper functions. |
| 78 | |
| 79 | A \bt_comp can add a port with: |
| 80 | |
| 81 | - bt_self_component_source_add_output_port() |
| 82 | - bt_self_component_filter_add_input_port() |
| 83 | - bt_self_component_filter_add_output_port() |
| 84 | - bt_self_component_sink_add_input_port() |
| 85 | |
| 86 | Borrow a port's \bt_conn, if any, with |
| 87 | bt_port_borrow_connection_const(). |
| 88 | |
| 89 | Borrow the component to which a port belongs with |
| 90 | bt_port_borrow_component_const(). |
| 91 | |
| 92 | <h1>Properties</h1> |
| 93 | |
| 94 | A port has the following common properties: |
| 95 | |
| 96 | <dl> |
| 97 | <dt> |
| 98 | \anchor api-port-prop-name |
| 99 | Name |
| 100 | </dt> |
| 101 | <dd> |
| 102 | Name of the port. |
| 103 | |
| 104 | For a given \bt_comp: |
| 105 | |
| 106 | - Each input port has a unique name. |
| 107 | - Each output port has a unique name. |
| 108 | |
| 109 | A port's name is set when the component adds it; you cannot change |
| 110 | it afterwards. |
| 111 | |
| 112 | Get a port's name with bt_port_get_name(). |
| 113 | </dd> |
| 114 | |
| 115 | <dt> |
| 116 | \anchor api-port-prop-is-connected |
| 117 | Is connected? |
| 118 | </dt> |
| 119 | <dd> |
| 120 | Whether or not the port is currently connected to another port. |
| 121 | |
| 122 | Get whether or not a port is connected with bt_port_is_connected(). |
| 123 | |
| 124 | When a port is unconnected, bt_port_borrow_connection_const() |
| 125 | returns \c NULL. |
| 126 | </dd> |
| 127 | </dl> |
| 128 | */ |
| 129 | |
| 130 | /*! @{ */ |
| 131 | |
| 132 | /*! |
| 133 | @name Types |
| 134 | @{ |
| 135 | |
| 136 | @typedef struct bt_port bt_port; |
| 137 | |
| 138 | @brief |
| 139 | Port. |
| 140 | |
| 141 | @typedef struct bt_port_input bt_port_input; |
| 142 | |
| 143 | @brief |
| 144 | \bt_c_iport. |
| 145 | |
| 146 | @typedef struct bt_port_output bt_port_output; |
| 147 | |
| 148 | @brief |
| 149 | \bt_c_oport. |
| 150 | |
| 151 | @} |
| 152 | */ |
| 153 | |
| 154 | /*! |
| 155 | @name Type query |
| 156 | @{ |
| 157 | */ |
| 158 | |
| 159 | /*! |
| 160 | @brief |
| 161 | Port type enumerators. |
| 162 | */ |
| 163 | typedef enum bt_port_type { |
| 164 | /*! |
| 165 | @brief |
| 166 | \bt_c_iport. |
| 167 | */ |
| 168 | BT_PORT_TYPE_INPUT = 1 << 0, |
| 169 | |
| 170 | /*! |
| 171 | @brief |
| 172 | \bt_c_oport. |
| 173 | */ |
| 174 | BT_PORT_TYPE_OUTPUT = 1 << 1, |
| 175 | } bt_port_type; |
| 176 | |
| 177 | /*! |
| 178 | @brief |
| 179 | Returns the type enumerator of the port \bt_p{port}. |
| 180 | |
| 181 | @param[in] port |
| 182 | Port of which to get the type enumerator |
| 183 | |
| 184 | @returns |
| 185 | Type enumerator of \bt_p{port}. |
| 186 | |
| 187 | @bt_pre_not_null{port} |
| 188 | |
| 189 | @sa bt_port_is_input() — |
| 190 | Returns whether or not a port is an \bt_iport. |
| 191 | @sa bt_port_is_output() — |
| 192 | Returns whether or not a port is an \bt_oport. |
| 193 | */ |
| 194 | extern bt_port_type bt_port_get_type(const bt_port *port); |
| 195 | |
| 196 | /*! |
| 197 | @brief |
| 198 | Returns whether or not the port \bt_p{port} is an \bt_iport. |
| 199 | |
| 200 | @param[in] port |
| 201 | Port to check. |
| 202 | |
| 203 | @returns |
| 204 | #BT_TRUE if \bt_p{port} is an input port. |
| 205 | |
| 206 | @bt_pre_not_null{port} |
| 207 | |
| 208 | @sa bt_port_get_type() — |
| 209 | Returns the type enumerator of a port. |
| 210 | */ |
| 211 | static inline |
| 212 | bt_bool bt_port_is_input(const bt_port *port) |
| 213 | { |
| 214 | return bt_port_get_type(port) == BT_PORT_TYPE_INPUT; |
| 215 | } |
| 216 | |
| 217 | /*! |
| 218 | @brief |
| 219 | Returns whether or not the port \bt_p{port} is an \bt_oport. |
| 220 | |
| 221 | @param[in] port |
| 222 | Port to check. |
| 223 | |
| 224 | @returns |
| 225 | #BT_TRUE if \bt_p{port} is an output port. |
| 226 | |
| 227 | @bt_pre_not_null{port} |
| 228 | |
| 229 | @sa bt_port_get_type() — |
| 230 | Returns the type enumerator of a port. |
| 231 | */ |
| 232 | static inline |
| 233 | bt_bool bt_port_is_output(const bt_port *port) |
| 234 | { |
| 235 | return bt_port_get_type(port) == BT_PORT_TYPE_OUTPUT; |
| 236 | } |
| 237 | |
| 238 | /*! @} */ |
| 239 | |
| 240 | /*! |
| 241 | @name Connection access |
| 242 | @{ |
| 243 | */ |
| 244 | |
| 245 | /*! |
| 246 | @brief |
| 247 | Borrows the \bt_conn of the port \bt_p{port}. |
| 248 | |
| 249 | This function returns \c NULL if \bt_p{port} is unconnected |
| 250 | (bt_port_is_connected() returns #BT_FALSE). |
| 251 | |
| 252 | @param[in] port |
| 253 | Port of which to borrow the connection. |
| 254 | |
| 255 | @returns |
| 256 | \em Borrowed reference of the connection of \bt_p{port}. |
| 257 | |
| 258 | @bt_pre_not_null{port} |
| 259 | */ |
| 260 | extern const bt_connection *bt_port_borrow_connection_const( |
| 261 | const bt_port *port); |
| 262 | |
| 263 | /*! @} */ |
| 264 | |
| 265 | /*! |
| 266 | @name Component access |
| 267 | @{ |
| 268 | */ |
| 269 | |
| 270 | /*! |
| 271 | @brief |
| 272 | Borrows the \bt_comp to which the port \bt_p{port} belongs. |
| 273 | |
| 274 | @param[in] port |
| 275 | Port of which to borrow the component which owns it. |
| 276 | |
| 277 | @returns |
| 278 | \em Borrowed reference of the component which owns \bt_p{port}. |
| 279 | |
| 280 | @bt_pre_not_null{port} |
| 281 | */ |
| 282 | extern const bt_component *bt_port_borrow_component_const( |
| 283 | const bt_port *port); |
| 284 | |
| 285 | /*! @} */ |
| 286 | |
| 287 | /*! |
| 288 | @name Properties |
| 289 | @{ |
| 290 | */ |
| 291 | |
| 292 | /*! |
| 293 | @brief |
| 294 | Returns the name of the port \bt_p{port}. |
| 295 | |
| 296 | See the \ref api-port-prop-name "name" property. |
| 297 | |
| 298 | @param[in] port |
| 299 | Port of which to get the name. |
| 300 | |
| 301 | @returns |
| 302 | @parblock |
| 303 | Name of \bt_p{port}, or \c NULL if none. |
| 304 | |
| 305 | The returned pointer remains valid as long as \bt_p{port} exists. |
| 306 | @endparblock |
| 307 | |
| 308 | @bt_pre_not_null{port} |
| 309 | */ |
| 310 | extern const char *bt_port_get_name(const bt_port *port); |
| 311 | |
| 312 | /*! |
| 313 | @brief |
| 314 | Returns whether or not the port \bt_p{port} is connected. |
| 315 | |
| 316 | See the \ref api-port-prop-is-connected "is connected?" property. |
| 317 | |
| 318 | @param[in] port |
| 319 | Port of which to get whether or not it's connected. |
| 320 | |
| 321 | @returns |
| 322 | #BT_TRUE if \bt_p{port} is connected. |
| 323 | |
| 324 | @bt_pre_not_null{port} |
| 325 | */ |
| 326 | extern bt_bool bt_port_is_connected(const bt_port *port); |
| 327 | |
| 328 | /*! @} */ |
| 329 | |
| 330 | /*! |
| 331 | @name Reference count (common) |
| 332 | @{ |
| 333 | */ |
| 334 | |
| 335 | /*! |
| 336 | @brief |
| 337 | Increments the \ref api-fund-shared-object "reference count" of |
| 338 | the port \bt_p{port}. |
| 339 | |
| 340 | @param[in] port |
| 341 | @parblock |
| 342 | Port of which to increment the reference count. |
| 343 | |
| 344 | Can be \c NULL. |
| 345 | @endparblock |
| 346 | |
| 347 | @sa bt_port_put_ref() — |
| 348 | Decrements the reference count of a port. |
| 349 | */ |
| 350 | extern void bt_port_get_ref(const bt_port *port); |
| 351 | |
| 352 | /*! |
| 353 | @brief |
| 354 | Decrements the \ref api-fund-shared-object "reference count" of |
| 355 | the port \bt_p{port}. |
| 356 | |
| 357 | @param[in] port |
| 358 | @parblock |
| 359 | Port of which to decrement the reference count. |
| 360 | |
| 361 | Can be \c NULL. |
| 362 | @endparblock |
| 363 | |
| 364 | @sa bt_port_get_ref() — |
| 365 | Increments the reference count of a port. |
| 366 | */ |
| 367 | extern void bt_port_put_ref(const bt_port *port); |
| 368 | |
| 369 | /*! |
| 370 | @brief |
| 371 | Decrements the reference count of the port |
| 372 | \bt_p{_port}, and then sets \bt_p{_port} to \c NULL. |
| 373 | |
| 374 | @param _port |
| 375 | @parblock |
| 376 | Port of which to decrement the reference count. |
| 377 | |
| 378 | Can contain \c NULL. |
| 379 | @endparblock |
| 380 | |
| 381 | @bt_pre_assign_expr{_port} |
| 382 | */ |
| 383 | #define BT_PORT_PUT_REF_AND_RESET(_port) \ |
| 384 | do { \ |
| 385 | bt_port_put_ref(_port); \ |
| 386 | (_port) = NULL; \ |
| 387 | } while (0) |
| 388 | |
| 389 | /*! |
| 390 | @brief |
| 391 | Decrements the reference count of the port \bt_p{_dst}, sets |
| 392 | \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to \c NULL. |
| 393 | |
| 394 | This macro effectively moves a port reference from the |
| 395 | expression \bt_p{_src} to the expression \bt_p{_dst}, putting the |
| 396 | existing \bt_p{_dst} reference. |
| 397 | |
| 398 | @param _dst |
| 399 | @parblock |
| 400 | Destination expression. |
| 401 | |
| 402 | Can contain \c NULL. |
| 403 | @endparblock |
| 404 | @param _src |
| 405 | @parblock |
| 406 | Source expression. |
| 407 | |
| 408 | Can contain \c NULL. |
| 409 | @endparblock |
| 410 | |
| 411 | @bt_pre_assign_expr{_dst} |
| 412 | @bt_pre_assign_expr{_src} |
| 413 | */ |
| 414 | #define BT_PORT_MOVE_REF(_dst, _src) \ |
| 415 | do { \ |
| 416 | bt_port_put_ref(_dst); \ |
| 417 | (_dst) = (_src); \ |
| 418 | (_src) = NULL; \ |
| 419 | } while (0) |
| 420 | |
| 421 | /*! @} */ |
| 422 | |
| 423 | /*! |
| 424 | @name Input port |
| 425 | @{ |
| 426 | */ |
| 427 | |
| 428 | /*! |
| 429 | @brief |
| 430 | \ref api-fund-c-typing "Upcasts" the \bt_iport \bt_p{port} to the |
| 431 | common #bt_port type. |
| 432 | |
| 433 | @param[in] port |
| 434 | @parblock |
| 435 | Input port to upcast. |
| 436 | |
| 437 | Can be \c NULL. |
| 438 | @endparblock |
| 439 | |
| 440 | @returns |
| 441 | \bt_p{port} as a common port. |
| 442 | */ |
| 443 | static inline |
| 444 | const bt_port *bt_port_input_as_port_const(const bt_port_input *port) |
| 445 | { |
| 446 | return __BT_UPCAST_CONST(bt_port, port); |
| 447 | } |
| 448 | |
| 449 | /*! |
| 450 | @brief |
| 451 | Increments the \ref api-fund-shared-object "reference count" of |
| 452 | the \bt_iport \bt_p{port}. |
| 453 | |
| 454 | @param[in] port |
| 455 | @parblock |
| 456 | Input port of which to increment the reference count. |
| 457 | |
| 458 | Can be \c NULL. |
| 459 | @endparblock |
| 460 | |
| 461 | @sa bt_port_input_put_ref() — |
| 462 | Decrements the reference count of an input port. |
| 463 | */ |
| 464 | extern void bt_port_input_get_ref(const bt_port_input *port); |
| 465 | |
| 466 | /*! |
| 467 | @brief |
| 468 | Decrements the \ref api-fund-shared-object "reference count" of |
| 469 | the \bt_iport \bt_p{port}. |
| 470 | |
| 471 | @param[in] port |
| 472 | @parblock |
| 473 | Input port of which to decrement the reference count. |
| 474 | |
| 475 | Can be \c NULL. |
| 476 | @endparblock |
| 477 | |
| 478 | @sa bt_port_input_get_ref() — |
| 479 | Increments the reference count of an input port. |
| 480 | */ |
| 481 | extern void bt_port_input_put_ref(const bt_port_input *port); |
| 482 | |
| 483 | /*! |
| 484 | @brief |
| 485 | Decrements the reference count of the \bt_iport |
| 486 | \bt_p{_port}, and then sets \bt_p{_port} to \c NULL. |
| 487 | |
| 488 | @param _port |
| 489 | @parblock |
| 490 | Input port of which to decrement the reference count. |
| 491 | |
| 492 | Can contain \c NULL. |
| 493 | @endparblock |
| 494 | |
| 495 | @bt_pre_assign_expr{_port} |
| 496 | */ |
| 497 | #define BT_PORT_INPUT_PUT_REF_AND_RESET(_port) \ |
| 498 | do { \ |
| 499 | bt_port_input_put_ref(_port); \ |
| 500 | (_port) = NULL; \ |
| 501 | } while (0) |
| 502 | |
| 503 | /*! |
| 504 | @brief |
| 505 | Decrements the reference count of the \bt_iport \bt_p{_dst}, sets |
| 506 | \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to \c NULL. |
| 507 | |
| 508 | This macro effectively moves an \bt_iport reference from the |
| 509 | expression \bt_p{_src} to the expression \bt_p{_dst}, putting the |
| 510 | existing \bt_p{_dst} reference. |
| 511 | |
| 512 | @param _dst |
| 513 | @parblock |
| 514 | Destination expression. |
| 515 | |
| 516 | Can contain \c NULL. |
| 517 | @endparblock |
| 518 | @param _src |
| 519 | @parblock |
| 520 | Source expression. |
| 521 | |
| 522 | Can contain \c NULL. |
| 523 | @endparblock |
| 524 | |
| 525 | @bt_pre_assign_expr{_dst} |
| 526 | @bt_pre_assign_expr{_src} |
| 527 | */ |
| 528 | #define BT_PORT_INPUT_MOVE_REF(_dst, _src) \ |
| 529 | do { \ |
| 530 | bt_port_input_put_ref(_dst); \ |
| 531 | (_dst) = (_src); \ |
| 532 | (_src) = NULL; \ |
| 533 | } while (0) |
| 534 | |
| 535 | /*! @} */ |
| 536 | |
| 537 | /*! |
| 538 | @name Output port |
| 539 | @{ |
| 540 | */ |
| 541 | |
| 542 | /*! |
| 543 | @brief |
| 544 | \ref api-fund-c-typing "Upcasts" the \bt_oport \bt_p{port} to the |
| 545 | common #bt_port type. |
| 546 | |
| 547 | @param[in] port |
| 548 | @parblock |
| 549 | Output port to upcast. |
| 550 | |
| 551 | Can be \c NULL. |
| 552 | @endparblock |
| 553 | |
| 554 | @returns |
| 555 | \bt_p{port} as a common port. |
| 556 | */ |
| 557 | static inline |
| 558 | const bt_port *bt_port_output_as_port_const(const bt_port_output *port) |
| 559 | { |
| 560 | return __BT_UPCAST_CONST(bt_port, port); |
| 561 | } |
| 562 | |
| 563 | /*! |
| 564 | @brief |
| 565 | Increments the \ref api-fund-shared-object "reference count" of |
| 566 | the \bt_oport \bt_p{port}. |
| 567 | |
| 568 | @param[in] port |
| 569 | @parblock |
| 570 | Output port of which to increment the reference count. |
| 571 | |
| 572 | Can be \c NULL. |
| 573 | @endparblock |
| 574 | |
| 575 | @sa bt_port_output_put_ref() — |
| 576 | Decrements the reference count of a \bt_oport. |
| 577 | */ |
| 578 | extern void bt_port_output_get_ref(const bt_port_output *port); |
| 579 | |
| 580 | /*! |
| 581 | @brief |
| 582 | Decrements the \ref api-fund-shared-object "reference count" of |
| 583 | the \bt_oport \bt_p{port}. |
| 584 | |
| 585 | @param[in] port |
| 586 | @parblock |
| 587 | Output port of which to decrement the reference count. |
| 588 | |
| 589 | Can be \c NULL. |
| 590 | @endparblock |
| 591 | |
| 592 | @sa bt_port_output_get_ref() — |
| 593 | Increments the reference count of a \bt_oport. |
| 594 | */ |
| 595 | extern void bt_port_output_put_ref(const bt_port_output *port); |
| 596 | |
| 597 | /*! |
| 598 | @brief |
| 599 | Decrements the reference count of the \bt_oport |
| 600 | \bt_p{_port}, and then sets \bt_p{_port} to \c NULL. |
| 601 | |
| 602 | @param _port |
| 603 | @parblock |
| 604 | Output port of which to decrement the reference count. |
| 605 | |
| 606 | Can contain \c NULL. |
| 607 | @endparblock |
| 608 | |
| 609 | @bt_pre_assign_expr{_port} |
| 610 | */ |
| 611 | #define BT_PORT_OUTPUT_PUT_REF_AND_RESET(_port) \ |
| 612 | do { \ |
| 613 | bt_port_output_put_ref(_port); \ |
| 614 | (_port) = NULL; \ |
| 615 | } while (0) |
| 616 | |
| 617 | /*! |
| 618 | @brief |
| 619 | Decrements the reference count of the \bt_oport \bt_p{_dst}, sets |
| 620 | \bt_p{_dst} to \bt_p{_src}, and then sets \bt_p{_src} to \c NULL. |
| 621 | |
| 622 | This macro effectively moves an \bt_oport reference from the |
| 623 | expression \bt_p{_src} to the expression \bt_p{_dst}, putting the |
| 624 | existing \bt_p{_dst} reference. |
| 625 | |
| 626 | @param _dst |
| 627 | @parblock |
| 628 | Destination expression. |
| 629 | |
| 630 | Can contain \c NULL. |
| 631 | @endparblock |
| 632 | @param _src |
| 633 | @parblock |
| 634 | Source expression. |
| 635 | |
| 636 | Can contain \c NULL. |
| 637 | @endparblock |
| 638 | |
| 639 | @bt_pre_assign_expr{_dst} |
| 640 | @bt_pre_assign_expr{_src} |
| 641 | */ |
| 642 | #define BT_PORT_OUTPUT_MOVE_REF(_dst, _src) \ |
| 643 | do { \ |
| 644 | bt_port_output_put_ref(_dst); \ |
| 645 | (_dst) = (_src); \ |
| 646 | (_src) = NULL; \ |
| 647 | } while (0) |
| 648 | |
| 649 | /*! @} */ |
| 650 | |
| 651 | /*! @} */ |
| 652 | |
| 653 | #ifdef __cplusplus |
| 654 | } |
| 655 | #endif |
| 656 | |
| 657 | #endif /* BABELTRACE2_GRAPH_PORT_H */ |