code.delx.au - pulseaudio/blob - src/pulse/mainloop.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <signal.h>
  31 #include <unistd.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <fcntl.h>
  35 #include <errno.h>
  36
  37 #ifdef HAVE_POLL_H
  38 #include <poll.h>
  39 #else
  40 #include <pulsecore/poll.h>
  41 #endif
  42
  43 #ifndef HAVE_PIPE
  44 #include <pulsecore/pipe.h>
  45 #endif
  46
  47 #include <pulse/timeval.h>
  48 #include <pulse/xmalloc.h>
  49
  50 #include <pulsecore/core-util.h>
  51 #include <pulsecore/llist.h>
  52 #include <pulsecore/log.h>
  53 #include <pulsecore/core-error.h>
  54 #include <pulsecore/winsock.h>
  55 #include <pulsecore/macro.h>
  56
  57 #include "mainloop.h"
  58
  59 struct pa_io_event {
  60     pa_mainloop *mainloop;
  61     int dead;
  62
  63     int fd;
  64     pa_io_event_flags_t events;
  65     struct pollfd *pollfd;
  66
  67     pa_io_event_cb_t callback;
  68     void *userdata;
  69     pa_io_event_destroy_cb_t destroy_callback;
  70
  71     PA_LLIST_FIELDS(pa_io_event);
  72 };
  73
  74 struct pa_time_event {
  75     pa_mainloop *mainloop;
  76     int dead;
  77
  78     int enabled;
  79     struct timeval timeval;
  80
  81     pa_time_event_cb_t callback;
  82     void *userdata;
  83     pa_time_event_destroy_cb_t destroy_callback;
  84
  85     PA_LLIST_FIELDS(pa_time_event);
  86 };
  87
  88 struct pa_defer_event {
  89     pa_mainloop *mainloop;
  90     int dead;
  91
  92     int enabled;
  93
  94     pa_defer_event_cb_t callback;
  95     void *userdata;
  96     pa_defer_event_destroy_cb_t destroy_callback;
  97
  98     PA_LLIST_FIELDS(pa_defer_event);
  99 };
 100
 101 struct pa_mainloop {
 102     PA_LLIST_HEAD(pa_io_event, io_events);
 103     PA_LLIST_HEAD(pa_time_event, time_events);
 104     PA_LLIST_HEAD(pa_defer_event, defer_events);
 105
 106     int n_enabled_defer_events, n_enabled_time_events, n_io_events;
 107     int io_events_please_scan, time_events_please_scan, defer_events_please_scan;
 108
 109     struct pollfd *pollfds;
 110     unsigned max_pollfds, n_pollfds;
 111     int rebuild_pollfds;
 112
 113     int prepared_timeout;
 114     pa_time_event *cached_next_time_event;
 115
 116     int quit, retval;
 117     pa_mainloop_api api;
 118
 119     int wakeup_pipe[2];
 120     int wakeup_pipe_type;
 121     int wakeup_requested;
 122
 123     enum {
 124         STATE_PASSIVE,
 125         STATE_PREPARED,
 126         STATE_POLLING,
 127         STATE_POLLED,
 128         STATE_QUIT
 129     } state;
 130
 131     pa_poll_func poll_func;
 132     void *poll_func_userdata;
 133     int poll_func_ret;
 134 };
 135
 136 static short map_flags_to_libc(pa_io_event_flags_t flags) {
 137     return
 138         (flags & PA_IO_EVENT_INPUT ? POLLIN : 0) |
 139         (flags & PA_IO_EVENT_OUTPUT ? POLLOUT : 0) |
 140         (flags & PA_IO_EVENT_ERROR ? POLLERR : 0) |
 141         (flags & PA_IO_EVENT_HANGUP ? POLLHUP : 0);
 142 }
 143
 144 static pa_io_event_flags_t map_flags_from_libc(short flags) {
 145     return
 146         (flags & POLLIN ? PA_IO_EVENT_INPUT : 0) |
 147         (flags & POLLOUT ? PA_IO_EVENT_OUTPUT : 0) |
 148         (flags & POLLERR ? PA_IO_EVENT_ERROR : 0) |
 149         (flags & POLLHUP ? PA_IO_EVENT_HANGUP : 0);
 150 }
 151
 152 /* IO events */
 153 static pa_io_event* mainloop_io_new(
 154         pa_mainloop_api*a,
 155         int fd,
 156         pa_io_event_flags_t events,
 157         pa_io_event_cb_t callback,
 158         void *userdata) {
 159
 160     pa_mainloop *m;
 161     pa_io_event *e;
 162
 163     pa_assert(a);
 164     pa_assert(a->userdata);
 165     pa_assert(fd >= 0);
 166     pa_assert(callback);
 167
 168     m = a->userdata;
 169     pa_assert(a == &m->api);
 170
 171     e = pa_xnew(pa_io_event, 1);
 172     e->mainloop = m;
 173     e->dead = 0;
 174
 175     e->fd = fd;
 176     e->events = events;
 177     e->pollfd = NULL;
 178
 179     e->callback = callback;
 180     e->userdata = userdata;
 181     e->destroy_callback = NULL;
 182
 183 #ifdef OS_IS_WIN32
 184     {
 185         fd_set xset;
 186         struct timeval tv;
 187
 188         tv.tv_sec = 0;
 189         tv.tv_usec = 0;
 190
 191         FD_ZERO (&xset);
 192         FD_SET (fd, &xset);
 193
 194         if ((select((SELECT_TYPE_ARG1) fd, NULL, NULL, SELECT_TYPE_ARG234 &xset,
 195                     SELECT_TYPE_ARG5 &tv) == -1) &&
 196              (WSAGetLastError() == WSAENOTSOCK)) {
 197             pa_log_warn("Cannot monitor non-socket file descriptors.");
 198             e->dead = 1;
 199         }
 200     }
 201 #endif
 202
 203     PA_LLIST_PREPEND(pa_io_event, m->io_events, e);
 204     m->rebuild_pollfds = 1;
 205     m->n_io_events ++;
 206
 207     pa_mainloop_wakeup(m);
 208
 209     return e;
 210 }
 211
 212 static void mainloop_io_enable(pa_io_event *e, pa_io_event_flags_t events) {
 213     pa_assert(e);
 214     pa_assert(!e->dead);
 215
 216     if (e->events == events)
 217         return;
 218
 219     e->events = events;
 220
 221     if (e->pollfd)
 222         e->pollfd->events = map_flags_to_libc(events);
 223     else
 224         e->mainloop->rebuild_pollfds = 1;
 225
 226     pa_mainloop_wakeup(e->mainloop);
 227 }
 228
 229 static void mainloop_io_free(pa_io_event *e) {
 230     pa_assert(e);
 231     pa_assert(!e->dead);
 232
 233     e->dead = 1;
 234     e->mainloop->io_events_please_scan ++;
 235
 236     e->mainloop->n_io_events --;
 237     e->mainloop->rebuild_pollfds = 1;
 238
 239     pa_mainloop_wakeup(e->mainloop);
 240 }
 241
 242 static void mainloop_io_set_destroy(pa_io_event *e, pa_io_event_destroy_cb_t callback) {
 243     pa_assert(e);
 244
 245     e->destroy_callback = callback;
 246 }
 247
 248 /* Defer events */
 249 static pa_defer_event* mainloop_defer_new(
 250         pa_mainloop_api*a,
 251         pa_defer_event_cb_t callback,
 252         void *userdata) {
 253
 254     pa_mainloop *m;
 255     pa_defer_event *e;
 256
 257     pa_assert(a);
 258     pa_assert(a->userdata);
 259     pa_assert(callback);
 260
 261     m = a->userdata;
 262     pa_assert(a == &m->api);
 263
 264     e = pa_xnew(pa_defer_event, 1);
 265     e->mainloop = m;
 266     e->dead = 0;
 267
 268     e->enabled = 1;
 269     m->n_enabled_defer_events++;
 270
 271     e->callback = callback;
 272     e->userdata = userdata;
 273     e->destroy_callback = NULL;
 274
 275     PA_LLIST_PREPEND(pa_defer_event, m->defer_events, e);
 276
 277     pa_mainloop_wakeup(e->mainloop);
 278
 279     return e;
 280 }
 281
 282 static void mainloop_defer_enable(pa_defer_event *e, int b) {
 283     pa_assert(e);
 284     pa_assert(!e->dead);
 285
 286     if (e->enabled && !b) {
 287         pa_assert(e->mainloop->n_enabled_defer_events > 0);
 288         e->mainloop->n_enabled_defer_events--;
 289     } else if (!e->enabled && b) {
 290         e->mainloop->n_enabled_defer_events++;
 291         pa_mainloop_wakeup(e->mainloop);
 292     }
 293
 294     e->enabled = b;
 295 }
 296
 297 static void mainloop_defer_free(pa_defer_event *e) {
 298     pa_assert(e);
 299     pa_assert(!e->dead);
 300
 301     e->dead = 1;
 302     e->mainloop->defer_events_please_scan ++;
 303
 304     if (e->enabled) {
 305         pa_assert(e->mainloop->n_enabled_defer_events > 0);
 306         e->mainloop->n_enabled_defer_events--;
 307         e->enabled = 0;
 308     }
 309 }
 310
 311 static void mainloop_defer_set_destroy(pa_defer_event *e, pa_defer_event_destroy_cb_t callback) {
 312     pa_assert(e);
 313     pa_assert(!e->dead);
 314
 315     e->destroy_callback = callback;
 316 }
 317
 318 /* Time events */
 319 static pa_time_event* mainloop_time_new(
 320         pa_mainloop_api*a,
 321         const struct timeval *tv,
 322         pa_time_event_cb_t callback,
 323         void *userdata) {
 324
 325     pa_mainloop *m;
 326     pa_time_event *e;
 327
 328     pa_assert(a);
 329     pa_assert(a->userdata);
 330     pa_assert(callback);
 331
 332     m = a->userdata;
 333     pa_assert(a == &m->api);
 334
 335     e = pa_xnew(pa_time_event, 1);
 336     e->mainloop = m;
 337     e->dead = 0;
 338
 339     if ((e->enabled = !!tv)) {
 340         e->timeval = *tv;
 341
 342         m->n_enabled_time_events++;
 343
 344         if (m->cached_next_time_event) {
 345             pa_assert(m->cached_next_time_event->enabled);
 346
 347             if (pa_timeval_cmp(tv, &m->cached_next_time_event->timeval) < 0)
 348                 m->cached_next_time_event = e;
 349         }
 350     }
 351
 352     e->callback = callback;
 353     e->userdata = userdata;
 354     e->destroy_callback = NULL;
 355
 356     PA_LLIST_PREPEND(pa_time_event, m->time_events, e);
 357
 358     if (e->enabled)
 359         pa_mainloop_wakeup(m);
 360
 361     return e;
 362 }
 363
 364 static void mainloop_time_restart(pa_time_event *e, const struct timeval *tv) {
 365     pa_assert(e);
 366     pa_assert(!e->dead);
 367
 368     if (e->enabled && !tv) {
 369         pa_assert(e->mainloop->n_enabled_time_events > 0);
 370         e->mainloop->n_enabled_time_events--;
 371     } else if (!e->enabled && tv)
 372         e->mainloop->n_enabled_time_events++;
 373
 374     if ((e->enabled = !!tv)) {
 375         e->timeval = *tv;
 376         pa_mainloop_wakeup(e->mainloop);
 377     }
 378
 379     if (e->mainloop->cached_next_time_event && e->enabled) {
 380         pa_assert(e->mainloop->cached_next_time_event->enabled);
 381
 382         if (pa_timeval_cmp(tv, &e->mainloop->cached_next_time_event->timeval) < 0)
 383             e->mainloop->cached_next_time_event = e;
 384     } else if (e->mainloop->cached_next_time_event == e)
 385         e->mainloop->cached_next_time_event = NULL;
 386 }
 387
 388 static void mainloop_time_free(pa_time_event *e) {
 389     pa_assert(e);
 390     pa_assert(!e->dead);
 391
 392     e->dead = 1;
 393     e->mainloop->time_events_please_scan ++;
 394
 395     if (e->enabled) {
 396         pa_assert(e->mainloop->n_enabled_time_events > 0);
 397         e->mainloop->n_enabled_time_events--;
 398         e->enabled = 0;
 399     }
 400
 401     if (e->mainloop->cached_next_time_event == e)
 402         e->mainloop->cached_next_time_event = NULL;
 403
 404     /* no wakeup needed here. Think about it! */
 405 }
 406
 407 static void mainloop_time_set_destroy(pa_time_event *e, pa_time_event_destroy_cb_t callback) {
 408     pa_assert(e);
 409     pa_assert(!e->dead);
 410
 411     e->destroy_callback = callback;
 412 }
 413
 414 /* quit() */
 415
 416 static void mainloop_quit(pa_mainloop_api*a, int retval) {
 417     pa_mainloop *m;
 418
 419     pa_assert(a);
 420     pa_assert(a->userdata);
 421     m = a->userdata;
 422     pa_assert(a == &m->api);
 423
 424     pa_mainloop_quit(m, retval);
 425 }
 426
 427 static const pa_mainloop_api vtable = {
 428     .userdata = NULL,
 429
 430     .io_new= mainloop_io_new,
 431     .io_enable= mainloop_io_enable,
 432     .io_free= mainloop_io_free,
 433     .io_set_destroy= mainloop_io_set_destroy,
 434
 435     .time_new = mainloop_time_new,
 436     .time_restart = mainloop_time_restart,
 437     .time_free = mainloop_time_free,
 438     .time_set_destroy = mainloop_time_set_destroy,
 439
 440     .defer_new = mainloop_defer_new,
 441     .defer_enable = mainloop_defer_enable,
 442     .defer_free = mainloop_defer_free,
 443     .defer_set_destroy = mainloop_defer_set_destroy,
 444
 445     .quit = mainloop_quit,
 446 };
 447
 448 pa_mainloop *pa_mainloop_new(void) {
 449     pa_mainloop *m;
 450
 451     m = pa_xnew(pa_mainloop, 1);
 452
 453     m->wakeup_pipe_type = 0;
 454     if (pipe(m->wakeup_pipe) < 0) {
 455         pa_log_error("ERROR: cannot create wakeup pipe");
 456         pa_xfree(m);
 457         return NULL;
 458     }
 459
 460     pa_make_fd_nonblock(m->wakeup_pipe[0]);
 461     pa_make_fd_nonblock(m->wakeup_pipe[1]);
 462     pa_make_fd_cloexec(m->wakeup_pipe[0]);
 463     pa_make_fd_cloexec(m->wakeup_pipe[1]);
 464     m->wakeup_requested = 0;
 465
 466     PA_LLIST_HEAD_INIT(pa_io_event, m->io_events);
 467     PA_LLIST_HEAD_INIT(pa_time_event, m->time_events);
 468     PA_LLIST_HEAD_INIT(pa_defer_event, m->defer_events);
 469
 470     m->n_enabled_defer_events = m->n_enabled_time_events = m->n_io_events = 0;
 471     m->io_events_please_scan = m->time_events_please_scan = m->defer_events_please_scan = 0;
 472
 473     m->cached_next_time_event = NULL;
 474     m->prepared_timeout = 0;
 475
 476     m->pollfds = NULL;
 477     m->max_pollfds = m->n_pollfds = 0;
 478     m->rebuild_pollfds = 1;
 479
 480     m->quit = m->retval = 0;
 481
 482     m->api = vtable;
 483     m->api.userdata = m;
 484
 485     m->state = STATE_PASSIVE;
 486
 487     m->poll_func = NULL;
 488     m->poll_func_userdata = NULL;
 489     m->poll_func_ret = -1;
 490
 491     return m;
 492 }
 493
 494 static void cleanup_io_events(pa_mainloop *m, int force) {
 495     pa_io_event *e;
 496
 497     e = m->io_events;
 498     while (e) {
 499         pa_io_event *n = e->next;
 500
 501         if (!force && m->io_events_please_scan <= 0)
 502             break;
 503
 504         if (force || e->dead) {
 505             PA_LLIST_REMOVE(pa_io_event, m->io_events, e);
 506
 507             if (e->dead) {
 508                 pa_assert(m->io_events_please_scan > 0);
 509                 m->io_events_please_scan--;
 510             }
 511
 512             if (e->destroy_callback)
 513                 e->destroy_callback(&m->api, e, e->userdata);
 514
 515             pa_xfree(e);
 516
 517             m->rebuild_pollfds = 1;
 518         }
 519
 520         e = n;
 521     }
 522
 523     pa_assert(m->io_events_please_scan == 0);
 524 }
 525
 526 static void cleanup_time_events(pa_mainloop *m, int force) {
 527     pa_time_event *e;
 528
 529     e = m->time_events;
 530     while (e) {
 531         pa_time_event *n = e->next;
 532
 533         if (!force && m->time_events_please_scan <= 0)
 534             break;
 535
 536         if (force || e->dead) {
 537             PA_LLIST_REMOVE(pa_time_event, m->time_events, e);
 538
 539             if (e->dead) {
 540                 pa_assert(m->time_events_please_scan > 0);
 541                 m->time_events_please_scan--;
 542             }
 543
 544             if (!e->dead && e->enabled) {
 545                 pa_assert(m->n_enabled_time_events > 0);
 546                 m->n_enabled_time_events--;
 547                 e->enabled = 0;
 548             }
 549
 550             if (e->destroy_callback)
 551                 e->destroy_callback(&m->api, e, e->userdata);
 552
 553             pa_xfree(e);
 554         }
 555
 556         e = n;
 557     }
 558
 559     pa_assert(m->time_events_please_scan == 0);
 560 }
 561
 562 static void cleanup_defer_events(pa_mainloop *m, int force) {
 563     pa_defer_event *e;
 564
 565     e = m->defer_events;
 566     while (e) {
 567         pa_defer_event *n = e->next;
 568
 569         if (!force && m->defer_events_please_scan <= 0)
 570             break;
 571
 572         if (force || e->dead) {
 573             PA_LLIST_REMOVE(pa_defer_event, m->defer_events, e);
 574
 575             if (e->dead) {
 576                 pa_assert(m->defer_events_please_scan > 0);
 577                 m->defer_events_please_scan--;
 578             }
 579
 580             if (!e->dead && e->enabled) {
 581                 pa_assert(m->n_enabled_defer_events > 0);
 582                 m->n_enabled_defer_events--;
 583                 e->enabled = 0;
 584             }
 585
 586             if (e->destroy_callback)
 587                 e->destroy_callback(&m->api, e, e->userdata);
 588
 589             pa_xfree(e);
 590         }
 591
 592         e = n;
 593     }
 594
 595     pa_assert(m->defer_events_please_scan == 0);
 596 }
 597
 598
 599 void pa_mainloop_free(pa_mainloop* m) {
 600     pa_assert(m);
 601
 602     cleanup_io_events(m, 1);
 603     cleanup_defer_events(m, 1);
 604     cleanup_time_events(m, 1);
 605
 606     pa_xfree(m->pollfds);
 607
 608     pa_close_pipe(m->wakeup_pipe);
 609
 610     pa_xfree(m);
 611 }
 612
 613 static void scan_dead(pa_mainloop *m) {
 614     pa_assert(m);
 615
 616     if (m->io_events_please_scan)
 617         cleanup_io_events(m, 0);
 618
 619     if (m->time_events_please_scan)
 620         cleanup_time_events(m, 0);
 621
 622     if (m->defer_events_please_scan)
 623         cleanup_defer_events(m, 0);
 624 }
 625
 626 static void rebuild_pollfds(pa_mainloop *m) {
 627     pa_io_event*e;
 628     struct pollfd *p;
 629     unsigned l;
 630
 631     l = m->n_io_events + 1;
 632     if (m->max_pollfds < l) {
 633         l *= 2;
 634         m->pollfds = pa_xrealloc(m->pollfds, sizeof(struct pollfd)*l);
 635         m->max_pollfds = l;
 636     }
 637
 638     m->n_pollfds = 0;
 639     p = m->pollfds;
 640
 641     if (m->wakeup_pipe[0] >= 0) {
 642         m->pollfds[0].fd = m->wakeup_pipe[0];
 643         m->pollfds[0].events = POLLIN;
 644         m->pollfds[0].revents = 0;
 645         p++;
 646         m->n_pollfds++;
 647     }
 648
 649     for (e = m->io_events; e; e = e->next) {
 650         if (e->dead) {
 651             e->pollfd = NULL;
 652             continue;
 653         }
 654
 655         e->pollfd = p;
 656         p->fd = e->fd;
 657         p->events = map_flags_to_libc(e->events);
 658         p->revents = 0;
 659
 660         p++;
 661         m->n_pollfds++;
 662     }
 663
 664     m->rebuild_pollfds = 0;
 665 }
 666
 667 static int dispatch_pollfds(pa_mainloop *m) {
 668     pa_io_event *e;
 669     int r = 0, k;
 670
 671     pa_assert(m->poll_func_ret > 0);
 672
 673     for (e = m->io_events, k = m->poll_func_ret; e && !m->quit && k > 0; e = e->next) {
 674         if (e->dead || !e->pollfd || !e->pollfd->revents)
 675             continue;
 676
 677         pa_assert(e->pollfd->fd == e->fd);
 678         pa_assert(e->callback);
 679         e->callback(&m->api, e, e->fd, map_flags_from_libc(e->pollfd->revents), e->userdata);
 680         e->pollfd->revents = 0;
 681         r++;
 682
 683         k--;
 684     }
 685
 686     return r;
 687 }
 688
 689 static int dispatch_defer(pa_mainloop *m) {
 690     pa_defer_event *e;
 691     int r = 0;
 692
 693     if (m->n_enabled_defer_events <= 0)
 694         return 0;
 695
 696     for (e = m->defer_events; e && !m->quit; e = e->next) {
 697         if (e->dead || !e->enabled)
 698             continue;
 699
 700         pa_assert(e->callback);
 701         e->callback(&m->api, e, e->userdata);
 702         r++;
 703     }
 704
 705     return r;
 706 }
 707
 708 static pa_time_event* find_next_time_event(pa_mainloop *m) {
 709     pa_time_event *t, *n = NULL;
 710     pa_assert(m);
 711
 712     if (m->cached_next_time_event)
 713         return m->cached_next_time_event;
 714
 715     for (t = m->time_events; t; t = t->next) {
 716
 717         if (t->dead || !t->enabled)
 718             continue;
 719
 720         if (!n || pa_timeval_cmp(&t->timeval, &n->timeval) < 0) {
 721             n = t;
 722
 723             /* Shortcut for tv = { 0, 0 } */
 724             if (n->timeval.tv_sec <= 0)
 725                 break;
 726         }
 727     }
 728
 729     m->cached_next_time_event = n;
 730     return n;
 731 }
 732
 733 static int calc_next_timeout(pa_mainloop *m) {
 734     pa_time_event *t;
 735     struct timeval now;
 736     pa_usec_t usec;
 737
 738     if (!m->n_enabled_time_events)
 739         return -1;
 740
 741     t = find_next_time_event(m);
 742     pa_assert(t);
 743
 744     if (t->timeval.tv_sec <= 0)
 745         return 0;
 746
 747     pa_gettimeofday(&now);
 748
 749     if (pa_timeval_cmp(&t->timeval, &now) <= 0)
 750         return 0;
 751
 752     usec = pa_timeval_diff(&t->timeval, &now);
 753     return (int) (usec / 1000);
 754 }
 755
 756 static int dispatch_timeout(pa_mainloop *m) {
 757     pa_time_event *e;
 758     struct timeval now;
 759     int r = 0;
 760     pa_assert(m);
 761
 762     if (m->n_enabled_time_events <= 0)
 763         return 0;
 764
 765     pa_gettimeofday(&now);
 766
 767     for (e = m->time_events; e && !m->quit; e = e->next) {
 768
 769         if (e->dead || !e->enabled)
 770             continue;
 771
 772         if (pa_timeval_cmp(&e->timeval, &now) <= 0) {
 773             pa_assert(e->callback);
 774
 775             /* Disable time event */
 776             mainloop_time_restart(e, NULL);
 777
 778             e->callback(&m->api, e, &e->timeval, e->userdata);
 779
 780             r++;
 781         }
 782     }
 783
 784     return r;
 785 }
 786
 787 void pa_mainloop_wakeup(pa_mainloop *m) {
 788     char c = 'W';
 789     pa_assert(m);
 790
 791     if (m->wakeup_pipe[1] >= 0 && m->state == STATE_POLLING) {
 792         pa_write(m->wakeup_pipe[1], &c, sizeof(c), &m->wakeup_pipe_type);
 793         m->wakeup_requested++;
 794     }
 795 }
 796
 797 static void clear_wakeup(pa_mainloop *m) {
 798     char c[10];
 799
 800     pa_assert(m);
 801
 802     if (m->wakeup_pipe[0] < 0)
 803         return;
 804
 805     if (m->wakeup_requested) {
 806         while (pa_read(m->wakeup_pipe[0], &c, sizeof(c), &m->wakeup_pipe_type) == sizeof(c));
 807         m->wakeup_requested = 0;
 808     }
 809 }
 810
 811 int pa_mainloop_prepare(pa_mainloop *m, int timeout) {
 812     pa_assert(m);
 813     pa_assert(m->state == STATE_PASSIVE);
 814
 815     clear_wakeup(m);
 816     scan_dead(m);
 817
 818     if (m->quit)
 819         goto quit;
 820
 821     if (m->n_enabled_defer_events <= 0) {
 822         if (m->rebuild_pollfds)
 823             rebuild_pollfds(m);
 824
 825         m->prepared_timeout = calc_next_timeout(m);
 826         if (timeout >= 0 && (timeout < m->prepared_timeout || m->prepared_timeout < 0))
 827             m->prepared_timeout = timeout;
 828     }
 829
 830     m->state = STATE_PREPARED;
 831     return 0;
 832
 833 quit:
 834     m->state = STATE_QUIT;
 835     return -2;
 836 }
 837
 838 int pa_mainloop_poll(pa_mainloop *m) {
 839     pa_assert(m);
 840     pa_assert(m->state == STATE_PREPARED);
 841
 842     if (m->quit)
 843         goto quit;
 844
 845     m->state = STATE_POLLING;
 846
 847     if (m->n_enabled_defer_events )
 848         m->poll_func_ret = 0;
 849     else {
 850         pa_assert(!m->rebuild_pollfds);
 851
 852         if (m->poll_func)
 853             m->poll_func_ret = m->poll_func(m->pollfds, m->n_pollfds, m->prepared_timeout, m->poll_func_userdata);
 854         else
 855             m->poll_func_ret = poll(m->pollfds, m->n_pollfds, m->prepared_timeout);
 856
 857         if (m->poll_func_ret < 0) {
 858             if (errno == EINTR)
 859                 m->poll_func_ret = 0;
 860             else
 861                 pa_log("poll(): %s", pa_cstrerror(errno));
 862         }
 863     }
 864
 865     m->state = m->poll_func_ret < 0 ? STATE_PASSIVE : STATE_POLLED;
 866     return m->poll_func_ret;
 867
 868 quit:
 869     m->state = STATE_QUIT;
 870     return -2;
 871 }
 872
 873 int pa_mainloop_dispatch(pa_mainloop *m) {
 874     int dispatched = 0;
 875
 876     pa_assert(m);
 877     pa_assert(m->state == STATE_POLLED);
 878
 879     if (m->quit)
 880         goto quit;
 881
 882     if (m->n_enabled_defer_events)
 883         dispatched += dispatch_defer(m);
 884     else {
 885         if (m->n_enabled_time_events)
 886             dispatched += dispatch_timeout(m);
 887
 888         if (m->quit)
 889             goto quit;
 890
 891         if (m->poll_func_ret > 0)
 892             dispatched += dispatch_pollfds(m);
 893     }
 894
 895     if (m->quit)
 896         goto quit;
 897
 898     m->state = STATE_PASSIVE;
 899
 900     return dispatched;
 901
 902 quit:
 903     m->state = STATE_QUIT;
 904     return -2;
 905 }
 906
 907 int pa_mainloop_get_retval(pa_mainloop *m) {
 908     pa_assert(m);
 909     return m->retval;
 910 }
 911
 912 int pa_mainloop_iterate(pa_mainloop *m, int block, int *retval) {
 913     int r;
 914     pa_assert(m);
 915
 916     if ((r = pa_mainloop_prepare(m, block ? -1 : 0)) < 0)
 917         goto quit;
 918
 919     if ((r = pa_mainloop_poll(m)) < 0)
 920         goto quit;
 921
 922     if ((r = pa_mainloop_dispatch(m)) < 0)
 923         goto quit;
 924
 925     return r;
 926
 927 quit:
 928
 929     if ((r == -2) && retval)
 930         *retval = pa_mainloop_get_retval(m);
 931     return r;
 932 }
 933
 934 int pa_mainloop_run(pa_mainloop *m, int *retval) {
 935     int r;
 936
 937     while ((r = pa_mainloop_iterate(m, 1, retval)) >= 0);
 938
 939     if (r == -2)
 940         return 1;
 941     else if (r < 0)
 942         return -1;
 943     else
 944         return 0;
 945 }
 946
 947 void pa_mainloop_quit(pa_mainloop *m, int retval) {
 948     pa_assert(m);
 949
 950     m->quit = 1;
 951     m->retval = retval;
 952     pa_mainloop_wakeup(m);
 953 }
 954
 955 pa_mainloop_api* pa_mainloop_get_api(pa_mainloop*m) {
 956     pa_assert(m);
 957     return &m->api;
 958 }
 959
 960 void pa_mainloop_set_poll_func(pa_mainloop *m, pa_poll_func poll_func, void *userdata) {
 961     pa_assert(m);
 962
 963     m->poll_func = poll_func;
 964     m->poll_func_userdata = userdata;
 965 }