1 /* -*- mode: C; c-file-style: "gnu" -*- */ 2 /* dbus-pending-call.c Object representing a call in progress. 3 * 4 * Copyright (C) 2002, 2003 Red Hat Inc. 5 * 6 * Licensed under the Academic Free License version 2.1 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include "dbus-internals.h" 25 #include "dbus-connection-internal.h" 26 #include "dbus-pending-call-internal.h" 27 #include "dbus-pending-call.h" 28 #include "dbus-list.h" 29 #include "dbus-threads.h" 30 #include "dbus-test.h" 31 32 /** 33 * @defgroup DBusPendingCallInternals DBusPendingCall implementation details 34 * @ingroup DBusInternals 35 * @brief DBusPendingCall private implementation details. 36 * 37 * The guts of DBusPendingCall and its methods. 38 * 39 * @{ 40 */ 41 42 /** 43 * @brief Internals of DBusPendingCall 44 * 45 * Opaque object representing a reply message that we're waiting for. 46 */ 47 48 /** 49 * shorter and more visible way to write _dbus_connection_lock() 50 */ 51 #define CONNECTION_LOCK(connection) _dbus_connection_lock(connection) 52 /** 53 * shorter and more visible way to write _dbus_connection_unlock() 54 */ 55 #define CONNECTION_UNLOCK(connection) _dbus_connection_unlock(connection) 56 57 /** 58 * Implementation details of #DBusPendingCall - all fields are private. 59 */ 60 struct DBusPendingCall 61 { 62 DBusAtomic refcount; /**< reference count */ 63 64 DBusDataSlotList slot_list; /**< Data stored by allocated integer ID */ 65 66 DBusPendingCallNotifyFunction function; /**< Notifier when reply arrives. */ 67 68 DBusConnection *connection; /**< Connections we're associated with */ 69 DBusMessage *reply; /**< Reply (after we've received it) */ 70 DBusTimeout *timeout; /**< Timeout */ 71 72 DBusList *timeout_link; /**< Preallocated timeout response */ 73 74 dbus_uint32_t reply_serial; /**< Expected serial of reply */ 75 76 unsigned int completed : 1; /**< TRUE if completed */ 77 unsigned int timeout_added : 1; /**< Have added the timeout */ 78 }; 79 80 static dbus_int32_t notify_user_data_slot = -1; 81 82 /** 83 * Creates a new pending reply object. 84 * 85 * @param connection connection where reply will arrive 86 * @param timeout_milliseconds length of timeout, -1 for default 87 * @param timeout_handler timeout handler, takes pending call as data 88 * @returns a new #DBusPendingCall or #NULL if no memory. 89 */ 90 DBusPendingCall* 91 _dbus_pending_call_new_unlocked (DBusConnection *connection, 92 int timeout_milliseconds, 93 DBusTimeoutHandler timeout_handler) 94 { 95 DBusPendingCall *pending; 96 DBusTimeout *timeout; 97 98 _dbus_assert (timeout_milliseconds >= 0 || timeout_milliseconds == -1); 99 100 if (timeout_milliseconds == -1) 101 timeout_milliseconds = _DBUS_DEFAULT_TIMEOUT_VALUE; 102 103 /* it would probably seem logical to pass in _DBUS_INT_MAX for 104 * infinite timeout, but then math in 105 * _dbus_connection_block_for_reply would get all overflow-prone, so 106 * smack that down. 107 */ 108 if (timeout_milliseconds > _DBUS_ONE_HOUR_IN_MILLISECONDS * 6) 109 timeout_milliseconds = _DBUS_ONE_HOUR_IN_MILLISECONDS * 6; 110 111 if (!dbus_pending_call_allocate_data_slot (¬ify_user_data_slot)) 112 return NULL; 113 114 pending = dbus_new0 (DBusPendingCall, 1); 115 116 if (pending == NULL) 117 { 118 dbus_pending_call_free_data_slot (¬ify_user_data_slot); 119 return NULL; 120 } 121 122 timeout = _dbus_timeout_new (timeout_milliseconds, 123 timeout_handler, 124 pending, NULL); 125 126 if (timeout == NULL) 127 { 128 dbus_pending_call_free_data_slot (¬ify_user_data_slot); 129 dbus_free (pending); 130 return NULL; 131 } 132 133 pending->refcount.value = 1; 134 pending->connection = connection; 135 _dbus_connection_ref_unlocked (pending->connection); 136 137 pending->timeout = timeout; 138 139 140 _dbus_data_slot_list_init (&pending->slot_list); 141 142 return pending; 143 } 144 145 /** 146 * Sets the reply of a pending call with the given message, 147 * or if the message is #NULL, by timing out the pending call. 148 * 149 * @param pending the pending call 150 * @param message the message to complete the call with, or #NULL 151 * to time out the call 152 */ 153 void 154 _dbus_pending_call_set_reply_unlocked (DBusPendingCall *pending, 155 DBusMessage *message) 156 { 157 if (message == NULL) 158 { 159 message = pending->timeout_link->data; 160 _dbus_list_clear (&pending->timeout_link); 161 } 162 else 163 dbus_message_ref (message); 164 165 _dbus_verbose (" handing message %p (%s) to pending call serial %u\n", 166 message, 167 dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_METHOD_RETURN ? 168 "method return" : 169 dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? 170 "error" : "other type", 171 pending->reply_serial); 172 173 _dbus_assert (pending->reply == NULL); 174 _dbus_assert (pending->reply_serial == dbus_message_get_reply_serial (message)); 175 pending->reply = message; 176 } 177 178 /** 179 * Calls notifier function for the pending call 180 * and sets the call to completed. 181 * 182 * @param pending the pending call 183 * 184 */ 185 void 186 _dbus_pending_call_complete (DBusPendingCall *pending) 187 { 188 _dbus_assert (!pending->completed); 189 190 pending->completed = TRUE; 191 192 if (pending->function) 193 { 194 void *user_data; 195 user_data = dbus_pending_call_get_data (pending, 196 notify_user_data_slot); 197 198 (* pending->function) (pending, user_data); 199 } 200 } 201 202 /** 203 * If the pending call hasn't been timed out, add its timeout 204 * error reply to the connection's incoming message queue. 205 * 206 * @param pending the pending call 207 * @param connection the connection the call was sent to 208 */ 209 void 210 _dbus_pending_call_queue_timeout_error_unlocked (DBusPendingCall *pending, 211 DBusConnection *connection) 212 { 213 _dbus_assert (connection == pending->connection); 214 215 if (pending->timeout_link) 216 { 217 _dbus_connection_queue_synthesized_message_link (connection, 218 pending->timeout_link); 219 pending->timeout_link = NULL; 220 } 221 } 222 223 /** 224 * Checks to see if a timeout has been added 225 * 226 * @param pending the pending_call 227 * @returns #TRUE if there is a timeout or #FALSE if not 228 */ 229 dbus_bool_t 230 _dbus_pending_call_is_timeout_added_unlocked (DBusPendingCall *pending) 231 { 232 _dbus_assert (pending != NULL); 233 234 return pending->timeout_added; 235 } 236 237 238 /** 239 * Sets wether the timeout has been added 240 * 241 * @param pending the pending_call 242 * @param is_added whether or not a timeout is added 243 */ 244 void 245 _dbus_pending_call_set_timeout_added_unlocked (DBusPendingCall *pending, 246 dbus_bool_t is_added) 247 { 248 _dbus_assert (pending != NULL); 249 250 pending->timeout_added = is_added; 251 } 252 253 254 /** 255 * Retrives the timeout 256 * 257 * @param pending the pending_call 258 * @returns a timeout object 259 */ 260 DBusTimeout * 261 _dbus_pending_call_get_timeout_unlocked (DBusPendingCall *pending) 262 { 263 _dbus_assert (pending != NULL); 264 265 return pending->timeout; 266 } 267 268 /** 269 * Gets the reply's serial number 270 * 271 * @param pending the pending_call 272 * @returns a serial number for the reply or 0 273 */ 274 dbus_uint32_t 275 _dbus_pending_call_get_reply_serial_unlocked (DBusPendingCall *pending) 276 { 277 _dbus_assert (pending != NULL); 278 279 return pending->reply_serial; 280 } 281 282 /** 283 * Sets the reply's serial number 284 * 285 * @param pending the pending_call 286 * @param serial the serial number 287 */ 288 void 289 _dbus_pending_call_set_reply_serial_unlocked (DBusPendingCall *pending, 290 dbus_uint32_t serial) 291 { 292 _dbus_assert (pending != NULL); 293 _dbus_assert (pending->reply_serial == 0); 294 295 pending->reply_serial = serial; 296 } 297 298 /** 299 * Gets the connection associated with this pending call. 300 * 301 * @param pending the pending_call 302 * @returns the connection associated with the pending call 303 */ 304 DBusConnection * 305 _dbus_pending_call_get_connection_and_lock (DBusPendingCall *pending) 306 { 307 _dbus_assert (pending != NULL); 308 309 CONNECTION_LOCK (pending->connection); 310 return pending->connection; 311 } 312 313 /** 314 * Gets the connection associated with this pending call. 315 * 316 * @param pending the pending_call 317 * @returns the connection associated with the pending call 318 */ 319 DBusConnection * 320 _dbus_pending_call_get_connection_unlocked (DBusPendingCall *pending) 321 { 322 _dbus_assert (pending != NULL); 323 324 return pending->connection; 325 } 326 327 /** 328 * Sets the reply message associated with the pending call to a timeout error 329 * 330 * @param pending the pending_call 331 * @param message the message we are sending the error reply to 332 * @param serial serial number for the reply 333 * @return #FALSE on OOM 334 */ 335 dbus_bool_t 336 _dbus_pending_call_set_timeout_error_unlocked (DBusPendingCall *pending, 337 DBusMessage *message, 338 dbus_uint32_t serial) 339 { 340 DBusList *reply_link; 341 DBusMessage *reply; 342 343 reply = dbus_message_new_error (message, DBUS_ERROR_NO_REPLY, 344 "Did not receive a reply. Possible causes include: " 345 "the remote application did not send a reply, " 346 "the message bus security policy blocked the reply, " 347 "the reply timeout expired, or " 348 "the network connection was broken."); 349 if (reply == NULL) 350 return FALSE; 351 352 reply_link = _dbus_list_alloc_link (reply); 353 if (reply_link == NULL) 354 { 355 dbus_message_unref (reply); 356 return FALSE; 357 } 358 359 pending->timeout_link = reply_link; 360 361 _dbus_pending_call_set_reply_serial_unlocked (pending, serial); 362 363 return TRUE; 364 } 365 366 /** 367 * Increments the reference count on a pending call, 368 * while the lock on its connection is already held. 369 * 370 * @param pending the pending call object 371 * @returns the pending call object 372 */ 373 DBusPendingCall * 374 _dbus_pending_call_ref_unlocked (DBusPendingCall *pending) 375 { 376 pending->refcount.value += 1; 377 378 return pending; 379 } 380 381 382 static void 383 _dbus_pending_call_last_unref (DBusPendingCall *pending) 384 { 385 DBusConnection *connection; 386 387 /* If we get here, we should be already detached 388 * from the connection, or never attached. 389 */ 390 _dbus_assert (!pending->timeout_added); 391 392 connection = pending->connection; 393 394 /* this assumes we aren't holding connection lock... */ 395 _dbus_data_slot_list_free (&pending->slot_list); 396 397 if (pending->timeout != NULL) 398 _dbus_timeout_unref (pending->timeout); 399 400 if (pending->timeout_link) 401 { 402 dbus_message_unref ((DBusMessage *)pending->timeout_link->data); 403 _dbus_list_free_link (pending->timeout_link); 404 pending->timeout_link = NULL; 405 } 406 407 if (pending->reply) 408 { 409 dbus_message_unref (pending->reply); 410 pending->reply = NULL; 411 } 412 413 dbus_free (pending); 414 415 dbus_pending_call_free_data_slot (¬ify_user_data_slot); 416 417 /* connection lock should not be held. */ 418 /* Free the connection last to avoid a weird state while 419 * calling out to application code where the pending exists 420 * but not the connection. 421 */ 422 dbus_connection_unref (connection); 423 } 424 425 /** 426 * Decrements the reference count on a pending call, 427 * freeing it if the count reaches 0. Assumes 428 * connection lock is already held. 429 * 430 * @param pending the pending call object 431 */ 432 void 433 _dbus_pending_call_unref_and_unlock (DBusPendingCall *pending) 434 { 435 dbus_bool_t last_unref; 436 437 _dbus_assert (pending->refcount.value > 0); 438 439 pending->refcount.value -= 1; 440 last_unref = pending->refcount.value == 0; 441 442 CONNECTION_UNLOCK (pending->connection); 443 if (last_unref) 444 _dbus_pending_call_last_unref (pending); 445 } 446 447 /** 448 * Checks whether the pending call has received a reply 449 * yet, or not. Assumes connection lock is held. 450 * 451 * @param pending the pending call 452 * @returns #TRUE if a reply has been received 453 */ 454 dbus_bool_t 455 _dbus_pending_call_get_completed_unlocked (DBusPendingCall *pending) 456 { 457 return pending->completed; 458 } 459 460 static DBusDataSlotAllocator slot_allocator; 461 _DBUS_DEFINE_GLOBAL_LOCK (pending_call_slots); 462 463 /** 464 * Stores a pointer on a #DBusPendingCall, along 465 * with an optional function to be used for freeing 466 * the data when the data is set again, or when 467 * the pending call is finalized. The slot number 468 * must have been allocated with dbus_pending_call_allocate_data_slot(). 469 * 470 * @param pending the pending_call 471 * @param slot the slot number 472 * @param data the data to store 473 * @param free_data_func finalizer function for the data 474 * @returns #TRUE if there was enough memory to store the data 475 */ 476 dbus_bool_t 477 _dbus_pending_call_set_data_unlocked (DBusPendingCall *pending, 478 dbus_int32_t slot, 479 void *data, 480 DBusFreeFunction free_data_func) 481 { 482 DBusFreeFunction old_free_func; 483 void *old_data; 484 dbus_bool_t retval; 485 486 retval = _dbus_data_slot_list_set (&slot_allocator, 487 &pending->slot_list, 488 slot, data, free_data_func, 489 &old_free_func, &old_data); 490 491 /* Drop locks to call out to app code */ 492 CONNECTION_UNLOCK (pending->connection); 493 494 if (retval) 495 { 496 if (old_free_func) 497 (* old_free_func) (old_data); 498 } 499 500 CONNECTION_LOCK (pending->connection); 501 502 return retval; 503 } 504 505 /** @} */ 506 507 /** 508 * @defgroup DBusPendingCall DBusPendingCall 509 * @ingroup DBus 510 * @brief Pending reply to a method call message 511 * 512 * A DBusPendingCall is an object representing an 513 * expected reply. A #DBusPendingCall can be created 514 * when you send a message that should have a reply. 515 * 516 * @{ 517 */ 518 519 /** 520 * @typedef DBusPendingCall 521 * 522 * Opaque data type representing a message pending. 523 */ 524 525 /** 526 * Increments the reference count on a pending call. 527 * 528 * @param pending the pending call object 529 * @returns the pending call object 530 */ 531 DBusPendingCall * 532 dbus_pending_call_ref (DBusPendingCall *pending) 533 { 534 _dbus_return_val_if_fail (pending != NULL, NULL); 535 536 /* The connection lock is better than the global 537 * lock in the atomic increment fallback 538 */ 539 #ifdef DBUS_HAVE_ATOMIC_INT 540 _dbus_atomic_inc (&pending->refcount); 541 #else 542 CONNECTION_LOCK (pending->connection); 543 _dbus_assert (pending->refcount.value > 0); 544 545 pending->refcount.value += 1; 546 CONNECTION_UNLOCK (pending->connection); 547 #endif 548 549 return pending; 550 } 551 552 /** 553 * Decrements the reference count on a pending call, 554 * freeing it if the count reaches 0. 555 * 556 * @param pending the pending call object 557 */ 558 void 559 dbus_pending_call_unref (DBusPendingCall *pending) 560 { 561 dbus_bool_t last_unref; 562 563 _dbus_return_if_fail (pending != NULL); 564 565 /* More efficient to use the connection lock instead of atomic 566 * int fallback if we lack atomic int decrement 567 */ 568 #ifdef DBUS_HAVE_ATOMIC_INT 569 last_unref = (_dbus_atomic_dec (&pending->refcount) == 1); 570 #else 571 CONNECTION_LOCK (pending->connection); 572 _dbus_assert (pending->refcount.value > 0); 573 pending->refcount.value -= 1; 574 last_unref = pending->refcount.value == 0; 575 CONNECTION_UNLOCK (pending->connection); 576 #endif 577 578 if (last_unref) 579 _dbus_pending_call_last_unref(pending); 580 } 581 582 /** 583 * Sets a notification function to be called when the reply is 584 * received or the pending call times out. 585 * 586 * @param pending the pending call 587 * @param function notifier function 588 * @param user_data data to pass to notifier function 589 * @param free_user_data function to free the user data 590 * @returns #FALSE if not enough memory 591 */ 592 dbus_bool_t 593 dbus_pending_call_set_notify (DBusPendingCall *pending, 594 DBusPendingCallNotifyFunction function, 595 void *user_data, 596 DBusFreeFunction free_user_data) 597 { 598 _dbus_return_val_if_fail (pending != NULL, FALSE); 599 600 CONNECTION_LOCK (pending->connection); 601 602 /* could invoke application code! */ 603 if (!_dbus_pending_call_set_data_unlocked (pending, notify_user_data_slot, 604 user_data, free_user_data)) 605 return FALSE; 606 607 pending->function = function; 608 609 CONNECTION_UNLOCK (pending->connection); 610 611 return TRUE; 612 } 613 614 /** 615 * Cancels the pending call, such that any reply or error received 616 * will just be ignored. Drops the dbus library's internal reference 617 * to the #DBusPendingCall so will free the call if nobody else is 618 * holding a reference. However you usually get a reference from 619 * dbus_connection_send_with_reply() so probably your app owns a ref 620 * also. 621 * 622 * Note that canceling a pending call will <em>not</em> simulate a 623 * timed-out call; if a call times out, then a timeout error reply is 624 * received. If you cancel the call, no reply is received unless the 625 * the reply was already received before you canceled. 626 * 627 * @param pending the pending call 628 */ 629 void 630 dbus_pending_call_cancel (DBusPendingCall *pending) 631 { 632 _dbus_return_if_fail (pending != NULL); 633 634 _dbus_connection_remove_pending_call (pending->connection, 635 pending); 636 } 637 638 /** 639 * Checks whether the pending call has received a reply 640 * yet, or not. 641 * 642 * @param pending the pending call 643 * @returns #TRUE if a reply has been received 644 */ 645 dbus_bool_t 646 dbus_pending_call_get_completed (DBusPendingCall *pending) 647 { 648 dbus_bool_t completed; 649 650 _dbus_return_val_if_fail (pending != NULL, FALSE); 651 652 CONNECTION_LOCK (pending->connection); 653 completed = pending->completed; 654 CONNECTION_UNLOCK (pending->connection); 655 656 return completed; 657 } 658 659 /** 660 * Gets the reply, or returns #NULL if none has been received 661 * yet. Ownership of the reply message passes to the caller. This 662 * function can only be called once per pending call, since the reply 663 * message is tranferred to the caller. 664 * 665 * @param pending the pending call 666 * @returns the reply message or #NULL. 667 */ 668 DBusMessage* 669 dbus_pending_call_steal_reply (DBusPendingCall *pending) 670 { 671 DBusMessage *message; 672 673 _dbus_return_val_if_fail (pending != NULL, NULL); 674 _dbus_return_val_if_fail (pending->completed, NULL); 675 _dbus_return_val_if_fail (pending->reply != NULL, NULL); 676 677 CONNECTION_LOCK (pending->connection); 678 679 message = pending->reply; 680 pending->reply = NULL; 681 682 CONNECTION_UNLOCK (pending->connection); 683 684 return message; 685 } 686 687 /** 688 * Block until the pending call is completed. The blocking is as with 689 * dbus_connection_send_with_reply_and_block(); it does not enter the 690 * main loop or process other messages, it simply waits for the reply 691 * in question. 692 * 693 * If the pending call is already completed, this function returns 694 * immediately. 695 * 696 * @todo when you start blocking, the timeout is reset, but it should 697 * really only use time remaining since the pending call was created. 698 * This requires storing timestamps instead of intervals in the timeout 699 * 700 * @param pending the pending call 701 */ 702 void 703 dbus_pending_call_block (DBusPendingCall *pending) 704 { 705 _dbus_return_if_fail (pending != NULL); 706 707 _dbus_connection_block_pending_call (pending); 708 } 709 710 /** 711 * Allocates an integer ID to be used for storing application-specific 712 * data on any DBusPendingCall. The allocated ID may then be used 713 * with dbus_pending_call_set_data() and dbus_pending_call_get_data(). 714 * The passed-in slot must be initialized to -1, and is filled in 715 * with the slot ID. If the passed-in slot is not -1, it's assumed 716 * to be already allocated, and its refcount is incremented. 717 * 718 * The allocated slot is global, i.e. all DBusPendingCall objects will 719 * have a slot with the given integer ID reserved. 720 * 721 * @param slot_p address of a global variable storing the slot 722 * @returns #FALSE on failure (no memory) 723 */ 724 dbus_bool_t 725 dbus_pending_call_allocate_data_slot (dbus_int32_t *slot_p) 726 { 727 _dbus_return_val_if_fail (slot_p != NULL, FALSE); 728 729 return _dbus_data_slot_allocator_alloc (&slot_allocator, 730 &_DBUS_LOCK_NAME (pending_call_slots), 731 slot_p); 732 } 733 734 /** 735 * Deallocates a global ID for #DBusPendingCall data slots. 736 * dbus_pending_call_get_data() and dbus_pending_call_set_data() may 737 * no longer be used with this slot. Existing data stored on existing 738 * DBusPendingCall objects will be freed when the #DBusPendingCall is 739 * finalized, but may not be retrieved (and may only be replaced if 740 * someone else reallocates the slot). When the refcount on the 741 * passed-in slot reaches 0, it is set to -1. 742 * 743 * @param slot_p address storing the slot to deallocate 744 */ 745 void 746 dbus_pending_call_free_data_slot (dbus_int32_t *slot_p) 747 { 748 _dbus_return_if_fail (slot_p != NULL); 749 _dbus_return_if_fail (*slot_p >= 0); 750 751 _dbus_data_slot_allocator_free (&slot_allocator, slot_p); 752 } 753 754 /** 755 * Stores a pointer on a #DBusPendingCall, along 756 * with an optional function to be used for freeing 757 * the data when the data is set again, or when 758 * the pending call is finalized. The slot number 759 * must have been allocated with dbus_pending_call_allocate_data_slot(). 760 * 761 * @param pending the pending_call 762 * @param slot the slot number 763 * @param data the data to store 764 * @param free_data_func finalizer function for the data 765 * @returns #TRUE if there was enough memory to store the data 766 */ 767 dbus_bool_t 768 dbus_pending_call_set_data (DBusPendingCall *pending, 769 dbus_int32_t slot, 770 void *data, 771 DBusFreeFunction free_data_func) 772 { 773 dbus_bool_t retval; 774 775 _dbus_return_val_if_fail (pending != NULL, FALSE); 776 _dbus_return_val_if_fail (slot >= 0, FALSE); 777 778 779 CONNECTION_LOCK (pending->connection); 780 retval = _dbus_pending_call_set_data_unlocked (pending, slot, data, free_data_func); 781 CONNECTION_UNLOCK (pending->connection); 782 return retval; 783 } 784 785 /** 786 * Retrieves data previously set with dbus_pending_call_set_data(). 787 * The slot must still be allocated (must not have been freed). 788 * 789 * @param pending the pending_call 790 * @param slot the slot to get data from 791 * @returns the data, or #NULL if not found 792 */ 793 void* 794 dbus_pending_call_get_data (DBusPendingCall *pending, 795 dbus_int32_t slot) 796 { 797 void *res; 798 799 _dbus_return_val_if_fail (pending != NULL, NULL); 800 801 CONNECTION_LOCK (pending->connection); 802 res = _dbus_data_slot_list_get (&slot_allocator, 803 &pending->slot_list, 804 slot); 805 CONNECTION_UNLOCK (pending->connection); 806 807 return res; 808 } 809 810 /** @} */ 811 812 #ifdef DBUS_BUILD_TESTS 813 814 /** 815 * @ingroup DBusPendingCallInternals 816 * Unit test for DBusPendingCall. 817 * 818 * @returns #TRUE on success. 819 */ 820 dbus_bool_t 821 _dbus_pending_call_test (const char *test_data_dir) 822 { 823 824 return TRUE; 825 } 826 #endif /* DBUS_BUILD_TESTS */ 827