1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ 2 /* dbus-mainloop.c Main loop utility 3 * 4 * Copyright (C) 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 * 22 */ 23 24 #include <config.h> 25 #include "dbus-mainloop.h" 26 27 #ifndef DOXYGEN_SHOULD_SKIP_THIS 28 29 #include <dbus/dbus-list.h> 30 #include <dbus/dbus-sysdeps.h> 31 32 #define MAINLOOP_SPEW 0 33 34 #if MAINLOOP_SPEW 35 #ifdef DBUS_ENABLE_VERBOSE_MODE 36 static const char* 37 watch_flags_to_string (int flags) 38 { 39 const char *watch_type; 40 41 if ((flags & DBUS_WATCH_READABLE) && 42 (flags & DBUS_WATCH_WRITABLE)) 43 watch_type = "readwrite"; 44 else if (flags & DBUS_WATCH_READABLE) 45 watch_type = "read"; 46 else if (flags & DBUS_WATCH_WRITABLE) 47 watch_type = "write"; 48 else 49 watch_type = "not read or write"; 50 return watch_type; 51 } 52 #endif /* DBUS_ENABLE_VERBOSE_MODE */ 53 #endif /* MAINLOOP_SPEW */ 54 55 struct DBusLoop 56 { 57 int refcount; 58 DBusList *callbacks; 59 int callback_list_serial; 60 int watch_count; 61 int timeout_count; 62 int depth; /**< number of recursive runs */ 63 DBusList *need_dispatch; 64 }; 65 66 typedef enum 67 { 68 CALLBACK_WATCH, 69 CALLBACK_TIMEOUT 70 } CallbackType; 71 72 typedef struct 73 { 74 int refcount; 75 CallbackType type; 76 void *data; 77 DBusFreeFunction free_data_func; 78 } Callback; 79 80 typedef struct 81 { 82 Callback callback; 83 DBusWatchFunction function; 84 DBusWatch *watch; 85 /* last watch handle failed due to OOM */ 86 unsigned int last_iteration_oom : 1; 87 } WatchCallback; 88 89 typedef struct 90 { 91 Callback callback; 92 DBusTimeout *timeout; 93 DBusTimeoutFunction function; 94 unsigned long last_tv_sec; 95 unsigned long last_tv_usec; 96 } TimeoutCallback; 97 98 #define WATCH_CALLBACK(callback) ((WatchCallback*)callback) 99 #define TIMEOUT_CALLBACK(callback) ((TimeoutCallback*)callback) 100 101 static WatchCallback* 102 watch_callback_new (DBusWatch *watch, 103 DBusWatchFunction function, 104 void *data, 105 DBusFreeFunction free_data_func) 106 { 107 WatchCallback *cb; 108 109 cb = dbus_new (WatchCallback, 1); 110 if (cb == NULL) 111 return NULL; 112 113 cb->watch = watch; 114 cb->function = function; 115 cb->last_iteration_oom = FALSE; 116 cb->callback.refcount = 1; 117 cb->callback.type = CALLBACK_WATCH; 118 cb->callback.data = data; 119 cb->callback.free_data_func = free_data_func; 120 121 return cb; 122 } 123 124 static TimeoutCallback* 125 timeout_callback_new (DBusTimeout *timeout, 126 DBusTimeoutFunction function, 127 void *data, 128 DBusFreeFunction free_data_func) 129 { 130 TimeoutCallback *cb; 131 132 cb = dbus_new (TimeoutCallback, 1); 133 if (cb == NULL) 134 return NULL; 135 136 cb->timeout = timeout; 137 cb->function = function; 138 _dbus_get_current_time (&cb->last_tv_sec, 139 &cb->last_tv_usec); 140 cb->callback.refcount = 1; 141 cb->callback.type = CALLBACK_TIMEOUT; 142 cb->callback.data = data; 143 cb->callback.free_data_func = free_data_func; 144 145 return cb; 146 } 147 148 static Callback * 149 callback_ref (Callback *cb) 150 { 151 _dbus_assert (cb->refcount > 0); 152 153 cb->refcount += 1; 154 155 return cb; 156 } 157 158 static void 159 callback_unref (Callback *cb) 160 { 161 _dbus_assert (cb->refcount > 0); 162 163 cb->refcount -= 1; 164 165 if (cb->refcount == 0) 166 { 167 if (cb->free_data_func) 168 (* cb->free_data_func) (cb->data); 169 170 dbus_free (cb); 171 } 172 } 173 174 static dbus_bool_t 175 add_callback (DBusLoop *loop, 176 Callback *cb) 177 { 178 if (!_dbus_list_append (&loop->callbacks, cb)) 179 return FALSE; 180 181 loop->callback_list_serial += 1; 182 183 switch (cb->type) 184 { 185 case CALLBACK_WATCH: 186 loop->watch_count += 1; 187 break; 188 case CALLBACK_TIMEOUT: 189 loop->timeout_count += 1; 190 break; 191 } 192 193 return TRUE; 194 } 195 196 static void 197 remove_callback (DBusLoop *loop, 198 DBusList *link) 199 { 200 Callback *cb = link->data; 201 202 switch (cb->type) 203 { 204 case CALLBACK_WATCH: 205 loop->watch_count -= 1; 206 break; 207 case CALLBACK_TIMEOUT: 208 loop->timeout_count -= 1; 209 break; 210 } 211 212 callback_unref (cb); 213 _dbus_list_remove_link (&loop->callbacks, link); 214 loop->callback_list_serial += 1; 215 } 216 217 DBusLoop* 218 _dbus_loop_new (void) 219 { 220 DBusLoop *loop; 221 222 loop = dbus_new0 (DBusLoop, 1); 223 if (loop == NULL) 224 return NULL; 225 226 loop->refcount = 1; 227 228 return loop; 229 } 230 231 DBusLoop * 232 _dbus_loop_ref (DBusLoop *loop) 233 { 234 _dbus_assert (loop != NULL); 235 _dbus_assert (loop->refcount > 0); 236 237 loop->refcount += 1; 238 239 return loop; 240 } 241 242 void 243 _dbus_loop_unref (DBusLoop *loop) 244 { 245 _dbus_assert (loop != NULL); 246 _dbus_assert (loop->refcount > 0); 247 248 loop->refcount -= 1; 249 if (loop->refcount == 0) 250 { 251 while (loop->need_dispatch) 252 { 253 DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch); 254 255 dbus_connection_unref (connection); 256 } 257 258 dbus_free (loop); 259 } 260 } 261 262 dbus_bool_t 263 _dbus_loop_add_watch (DBusLoop *loop, 264 DBusWatch *watch, 265 DBusWatchFunction function, 266 void *data, 267 DBusFreeFunction free_data_func) 268 { 269 WatchCallback *wcb; 270 271 wcb = watch_callback_new (watch, function, data, free_data_func); 272 if (wcb == NULL) 273 return FALSE; 274 275 if (!add_callback (loop, (Callback*) wcb)) 276 { 277 wcb->callback.free_data_func = NULL; /* don't want to have this side effect */ 278 callback_unref ((Callback*) wcb); 279 return FALSE; 280 } 281 282 return TRUE; 283 } 284 285 void 286 _dbus_loop_remove_watch (DBusLoop *loop, 287 DBusWatch *watch, 288 DBusWatchFunction function, 289 void *data) 290 { 291 DBusList *link; 292 293 link = _dbus_list_get_first_link (&loop->callbacks); 294 while (link != NULL) 295 { 296 DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link); 297 Callback *this = link->data; 298 299 if (this->type == CALLBACK_WATCH && 300 WATCH_CALLBACK (this)->watch == watch && 301 this->data == data && 302 WATCH_CALLBACK (this)->function == function) 303 { 304 remove_callback (loop, link); 305 306 return; 307 } 308 309 link = next; 310 } 311 312 _dbus_warn ("could not find watch %p function %p data %p to remove\n", 313 watch, (void *)function, data); 314 } 315 316 dbus_bool_t 317 _dbus_loop_add_timeout (DBusLoop *loop, 318 DBusTimeout *timeout, 319 DBusTimeoutFunction function, 320 void *data, 321 DBusFreeFunction free_data_func) 322 { 323 TimeoutCallback *tcb; 324 325 tcb = timeout_callback_new (timeout, function, data, free_data_func); 326 if (tcb == NULL) 327 return FALSE; 328 329 if (!add_callback (loop, (Callback*) tcb)) 330 { 331 tcb->callback.free_data_func = NULL; /* don't want to have this side effect */ 332 callback_unref ((Callback*) tcb); 333 return FALSE; 334 } 335 336 return TRUE; 337 } 338 339 void 340 _dbus_loop_remove_timeout (DBusLoop *loop, 341 DBusTimeout *timeout, 342 DBusTimeoutFunction function, 343 void *data) 344 { 345 DBusList *link; 346 347 link = _dbus_list_get_first_link (&loop->callbacks); 348 while (link != NULL) 349 { 350 DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link); 351 Callback *this = link->data; 352 353 if (this->type == CALLBACK_TIMEOUT && 354 TIMEOUT_CALLBACK (this)->timeout == timeout && 355 this->data == data && 356 TIMEOUT_CALLBACK (this)->function == function) 357 { 358 remove_callback (loop, link); 359 360 return; 361 } 362 363 link = next; 364 } 365 366 _dbus_warn ("could not find timeout %p function %p data %p to remove\n", 367 timeout, (void *)function, data); 368 } 369 370 /* Convolutions from GLib, there really must be a better way 371 * to do this. 372 */ 373 static dbus_bool_t 374 check_timeout (unsigned long tv_sec, 375 unsigned long tv_usec, 376 TimeoutCallback *tcb, 377 int *timeout) 378 { 379 long sec_remaining; 380 long msec_remaining; 381 unsigned long expiration_tv_sec; 382 unsigned long expiration_tv_usec; 383 long interval_seconds; 384 long interval_milliseconds; 385 int interval; 386 387 /* I'm pretty sure this function could suck (a lot) less */ 388 389 interval = dbus_timeout_get_interval (tcb->timeout); 390 391 interval_seconds = interval / 1000L; 392 interval_milliseconds = interval % 1000L; 393 394 expiration_tv_sec = tcb->last_tv_sec + interval_seconds; 395 expiration_tv_usec = tcb->last_tv_usec + interval_milliseconds * 1000; 396 if (expiration_tv_usec >= 1000000) 397 { 398 expiration_tv_usec -= 1000000; 399 expiration_tv_sec += 1; 400 } 401 402 sec_remaining = expiration_tv_sec - tv_sec; 403 /* need to force this to be signed, as it is intended to sometimes 404 * produce a negative result 405 */ 406 msec_remaining = ((long) expiration_tv_usec - (long) tv_usec) / 1000L; 407 408 #if MAINLOOP_SPEW 409 _dbus_verbose ("Interval is %ld seconds %ld msecs\n", 410 interval_seconds, 411 interval_milliseconds); 412 _dbus_verbose ("Now is %lu seconds %lu usecs\n", 413 tv_sec, tv_usec); 414 _dbus_verbose ("Last is %lu seconds %lu usecs\n", 415 tcb->last_tv_sec, tcb->last_tv_usec); 416 _dbus_verbose ("Exp is %lu seconds %lu usecs\n", 417 expiration_tv_sec, expiration_tv_usec); 418 _dbus_verbose ("Pre-correction, sec_remaining %ld msec_remaining %ld\n", 419 sec_remaining, msec_remaining); 420 #endif 421 422 /* We do the following in a rather convoluted fashion to deal with 423 * the fact that we don't have an integral type big enough to hold 424 * the difference of two timevals in milliseconds. 425 */ 426 if (sec_remaining < 0 || (sec_remaining == 0 && msec_remaining < 0)) 427 { 428 *timeout = 0; 429 } 430 else 431 { 432 if (msec_remaining < 0) 433 { 434 msec_remaining += 1000; 435 sec_remaining -= 1; 436 } 437 438 if (sec_remaining > (_DBUS_INT_MAX / 1000) || 439 msec_remaining > _DBUS_INT_MAX) 440 *timeout = _DBUS_INT_MAX; 441 else 442 *timeout = sec_remaining * 1000 + msec_remaining; 443 } 444 445 if (*timeout > interval) 446 { 447 /* This indicates that the system clock probably moved backward */ 448 _dbus_verbose ("System clock set backward! Resetting timeout.\n"); 449 450 tcb->last_tv_sec = tv_sec; 451 tcb->last_tv_usec = tv_usec; 452 453 *timeout = interval; 454 } 455 456 #if MAINLOOP_SPEW 457 _dbus_verbose (" timeout expires in %d milliseconds\n", *timeout); 458 #endif 459 460 return *timeout == 0; 461 } 462 463 dbus_bool_t 464 _dbus_loop_dispatch (DBusLoop *loop) 465 { 466 467 #if MAINLOOP_SPEW 468 _dbus_verbose (" %d connections to dispatch\n", _dbus_list_get_length (&loop->need_dispatch)); 469 #endif 470 471 if (loop->need_dispatch == NULL) 472 return FALSE; 473 474 next: 475 while (loop->need_dispatch != NULL) 476 { 477 DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch); 478 479 while (TRUE) 480 { 481 DBusDispatchStatus status; 482 483 status = dbus_connection_dispatch (connection); 484 485 if (status == DBUS_DISPATCH_COMPLETE) 486 { 487 dbus_connection_unref (connection); 488 goto next; 489 } 490 else 491 { 492 if (status == DBUS_DISPATCH_NEED_MEMORY) 493 _dbus_wait_for_memory (); 494 } 495 } 496 } 497 498 return TRUE; 499 } 500 501 dbus_bool_t 502 _dbus_loop_queue_dispatch (DBusLoop *loop, 503 DBusConnection *connection) 504 { 505 if (_dbus_list_append (&loop->need_dispatch, connection)) 506 { 507 dbus_connection_ref (connection); 508 return TRUE; 509 } 510 else 511 return FALSE; 512 } 513 514 /* Returns TRUE if we invoked any timeouts or have ready file 515 * descriptors, which is just used in test code as a debug hack 516 */ 517 518 dbus_bool_t 519 _dbus_loop_iterate (DBusLoop *loop, 520 dbus_bool_t block) 521 { 522 #define N_STACK_DESCRIPTORS 64 523 dbus_bool_t retval; 524 DBusPollFD *fds; 525 DBusPollFD stack_fds[N_STACK_DESCRIPTORS]; 526 int n_fds; 527 WatchCallback **watches_for_fds; 528 WatchCallback *stack_watches_for_fds[N_STACK_DESCRIPTORS]; 529 int i; 530 DBusList *link; 531 int n_ready; 532 int initial_serial; 533 long timeout; 534 dbus_bool_t oom_watch_pending; 535 int orig_depth; 536 537 retval = FALSE; 538 539 fds = NULL; 540 watches_for_fds = NULL; 541 n_fds = 0; 542 oom_watch_pending = FALSE; 543 orig_depth = loop->depth; 544 545 #if MAINLOOP_SPEW 546 _dbus_verbose ("Iteration block=%d depth=%d timeout_count=%d watch_count=%d\n", 547 block, loop->depth, loop->timeout_count, loop->watch_count); 548 #endif 549 550 if (loop->callbacks == NULL) 551 goto next_iteration; 552 553 if (loop->watch_count > N_STACK_DESCRIPTORS) 554 { 555 fds = dbus_new0 (DBusPollFD, loop->watch_count); 556 557 while (fds == NULL) 558 { 559 _dbus_wait_for_memory (); 560 fds = dbus_new0 (DBusPollFD, loop->watch_count); 561 } 562 563 watches_for_fds = dbus_new (WatchCallback*, loop->watch_count); 564 while (watches_for_fds == NULL) 565 { 566 _dbus_wait_for_memory (); 567 watches_for_fds = dbus_new (WatchCallback*, loop->watch_count); 568 } 569 } 570 else 571 { 572 fds = stack_fds; 573 watches_for_fds = stack_watches_for_fds; 574 } 575 576 /* fill our array of fds and watches */ 577 n_fds = 0; 578 link = _dbus_list_get_first_link (&loop->callbacks); 579 while (link != NULL) 580 { 581 DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link); 582 Callback *cb = link->data; 583 if (cb->type == CALLBACK_WATCH) 584 { 585 unsigned int flags; 586 WatchCallback *wcb = WATCH_CALLBACK (cb); 587 588 if (wcb->last_iteration_oom) 589 { 590 /* we skip this one this time, but reenable it next time, 591 * and have a timeout on this iteration 592 */ 593 wcb->last_iteration_oom = FALSE; 594 oom_watch_pending = TRUE; 595 596 retval = TRUE; /* return TRUE here to keep the loop going, 597 * since we don't know the watch is inactive 598 */ 599 600 #if MAINLOOP_SPEW 601 _dbus_verbose (" skipping watch on fd %d as it was out of memory last time\n", 602 dbus_watch_get_socket (wcb->watch)); 603 #endif 604 } 605 else if (dbus_watch_get_enabled (wcb->watch)) 606 { 607 watches_for_fds[n_fds] = wcb; 608 609 callback_ref (cb); 610 611 flags = dbus_watch_get_flags (wcb->watch); 612 613 fds[n_fds].fd = dbus_watch_get_socket (wcb->watch); 614 fds[n_fds].revents = 0; 615 fds[n_fds].events = 0; 616 if (flags & DBUS_WATCH_READABLE) 617 fds[n_fds].events |= _DBUS_POLLIN; 618 if (flags & DBUS_WATCH_WRITABLE) 619 fds[n_fds].events |= _DBUS_POLLOUT; 620 621 #if MAINLOOP_SPEW 622 _dbus_verbose (" polling watch on fd %d %s\n", 623 fds[n_fds].fd, watch_flags_to_string (flags)); 624 #endif 625 626 n_fds += 1; 627 } 628 else 629 { 630 #if MAINLOOP_SPEW 631 _dbus_verbose (" skipping disabled watch on fd %d %s\n", 632 dbus_watch_get_socket (wcb->watch), 633 watch_flags_to_string (dbus_watch_get_flags (wcb->watch))); 634 #endif 635 } 636 } 637 638 link = next; 639 } 640 641 timeout = -1; 642 if (loop->timeout_count > 0) 643 { 644 unsigned long tv_sec; 645 unsigned long tv_usec; 646 647 _dbus_get_current_time (&tv_sec, &tv_usec); 648 649 link = _dbus_list_get_first_link (&loop->callbacks); 650 while (link != NULL) 651 { 652 DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link); 653 Callback *cb = link->data; 654 655 if (cb->type == CALLBACK_TIMEOUT && 656 dbus_timeout_get_enabled (TIMEOUT_CALLBACK (cb)->timeout)) 657 { 658 TimeoutCallback *tcb = TIMEOUT_CALLBACK (cb); 659 int msecs_remaining; 660 661 check_timeout (tv_sec, tv_usec, tcb, &msecs_remaining); 662 663 if (timeout < 0) 664 timeout = msecs_remaining; 665 else 666 timeout = MIN (msecs_remaining, timeout); 667 668 #if MAINLOOP_SPEW 669 _dbus_verbose (" timeout added, %d remaining, aggregate timeout %ld\n", 670 msecs_remaining, timeout); 671 #endif 672 673 _dbus_assert (timeout >= 0); 674 675 if (timeout == 0) 676 break; /* it's not going to get shorter... */ 677 } 678 #if MAINLOOP_SPEW 679 else if (cb->type == CALLBACK_TIMEOUT) 680 { 681 _dbus_verbose (" skipping disabled timeout\n"); 682 } 683 #endif 684 685 link = next; 686 } 687 } 688 689 /* Never block if we have stuff to dispatch */ 690 if (!block || loop->need_dispatch != NULL) 691 { 692 timeout = 0; 693 #if MAINLOOP_SPEW 694 _dbus_verbose (" timeout is 0 as we aren't blocking\n"); 695 #endif 696 } 697 698 /* if a watch is OOM, don't wait longer than the OOM 699 * wait to re-enable it 700 */ 701 if (oom_watch_pending) 702 timeout = MIN (timeout, _dbus_get_oom_wait ()); 703 704 #if MAINLOOP_SPEW 705 _dbus_verbose (" polling on %d descriptors timeout %ld\n", n_fds, timeout); 706 #endif 707 708 n_ready = _dbus_poll (fds, n_fds, timeout); 709 710 initial_serial = loop->callback_list_serial; 711 712 if (loop->timeout_count > 0) 713 { 714 unsigned long tv_sec; 715 unsigned long tv_usec; 716 717 _dbus_get_current_time (&tv_sec, &tv_usec); 718 719 /* It'd be nice to avoid this O(n) thingy here */ 720 link = _dbus_list_get_first_link (&loop->callbacks); 721 while (link != NULL) 722 { 723 DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link); 724 Callback *cb = link->data; 725 726 if (initial_serial != loop->callback_list_serial) 727 goto next_iteration; 728 729 if (loop->depth != orig_depth) 730 goto next_iteration; 731 732 if (cb->type == CALLBACK_TIMEOUT && 733 dbus_timeout_get_enabled (TIMEOUT_CALLBACK (cb)->timeout)) 734 { 735 TimeoutCallback *tcb = TIMEOUT_CALLBACK (cb); 736 int msecs_remaining; 737 738 if (check_timeout (tv_sec, tv_usec, 739 tcb, &msecs_remaining)) 740 { 741 /* Save last callback time and fire this timeout */ 742 tcb->last_tv_sec = tv_sec; 743 tcb->last_tv_usec = tv_usec; 744 745 #if MAINLOOP_SPEW 746 _dbus_verbose (" invoking timeout\n"); 747 #endif 748 749 (* tcb->function) (tcb->timeout, 750 cb->data); 751 752 retval = TRUE; 753 } 754 else 755 { 756 #if MAINLOOP_SPEW 757 _dbus_verbose (" timeout has not expired\n"); 758 #endif 759 } 760 } 761 #if MAINLOOP_SPEW 762 else if (cb->type == CALLBACK_TIMEOUT) 763 { 764 _dbus_verbose (" skipping invocation of disabled timeout\n"); 765 } 766 #endif 767 768 link = next; 769 } 770 } 771 772 if (n_ready > 0) 773 { 774 i = 0; 775 while (i < n_fds) 776 { 777 /* FIXME I think this "restart if we change the watches" 778 * approach could result in starving watches 779 * toward the end of the list. 780 */ 781 if (initial_serial != loop->callback_list_serial) 782 goto next_iteration; 783 784 if (loop->depth != orig_depth) 785 goto next_iteration; 786 787 if (fds[i].revents != 0) 788 { 789 WatchCallback *wcb; 790 unsigned int condition; 791 792 wcb = watches_for_fds[i]; 793 794 condition = 0; 795 if (fds[i].revents & _DBUS_POLLIN) 796 condition |= DBUS_WATCH_READABLE; 797 if (fds[i].revents & _DBUS_POLLOUT) 798 condition |= DBUS_WATCH_WRITABLE; 799 if (fds[i].revents & _DBUS_POLLHUP) 800 condition |= DBUS_WATCH_HANGUP; 801 if (fds[i].revents & _DBUS_POLLERR) 802 condition |= DBUS_WATCH_ERROR; 803 804 /* condition may still be 0 if we got some 805 * weird POLLFOO thing like POLLWRBAND 806 */ 807 808 if (condition != 0 && 809 dbus_watch_get_enabled (wcb->watch)) 810 { 811 if (!(* wcb->function) (wcb->watch, 812 condition, 813 ((Callback*)wcb)->data)) 814 wcb->last_iteration_oom = TRUE; 815 816 #if MAINLOOP_SPEW 817 _dbus_verbose (" Invoked watch, oom = %d\n", 818 wcb->last_iteration_oom); 819 #endif 820 821 retval = TRUE; 822 } 823 } 824 825 ++i; 826 } 827 } 828 829 next_iteration: 830 #if MAINLOOP_SPEW 831 _dbus_verbose (" moving to next iteration\n"); 832 #endif 833 834 if (fds && fds != stack_fds) 835 dbus_free (fds); 836 if (watches_for_fds) 837 { 838 i = 0; 839 while (i < n_fds) 840 { 841 callback_unref (&watches_for_fds[i]->callback); 842 ++i; 843 } 844 845 if (watches_for_fds != stack_watches_for_fds) 846 dbus_free (watches_for_fds); 847 } 848 849 if (_dbus_loop_dispatch (loop)) 850 retval = TRUE; 851 852 #if MAINLOOP_SPEW 853 _dbus_verbose ("Returning %d\n", retval); 854 #endif 855 856 return retval; 857 } 858 859 void 860 _dbus_loop_run (DBusLoop *loop) 861 { 862 int our_exit_depth; 863 864 _dbus_assert (loop->depth >= 0); 865 866 _dbus_loop_ref (loop); 867 868 our_exit_depth = loop->depth; 869 loop->depth += 1; 870 871 _dbus_verbose ("Running main loop, depth %d -> %d\n", 872 loop->depth - 1, loop->depth); 873 874 while (loop->depth != our_exit_depth) 875 _dbus_loop_iterate (loop, TRUE); 876 877 _dbus_loop_unref (loop); 878 } 879 880 void 881 _dbus_loop_quit (DBusLoop *loop) 882 { 883 _dbus_assert (loop->depth > 0); 884 885 loop->depth -= 1; 886 887 _dbus_verbose ("Quit main loop, depth %d -> %d\n", 888 loop->depth + 1, loop->depth); 889 } 890 891 int 892 _dbus_get_oom_wait (void) 893 { 894 #ifdef DBUS_BUILD_TESTS 895 /* make tests go fast */ 896 return 0; 897 #else 898 return 500; 899 #endif 900 } 901 902 void 903 _dbus_wait_for_memory (void) 904 { 905 _dbus_verbose ("Waiting for more memory\n"); 906 _dbus_sleep_milliseconds (_dbus_get_oom_wait ()); 907 } 908 909 #endif /* !DOXYGEN_SHOULD_SKIP_THIS */ 910
