src/pulse/mainloop.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2.1 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28 #include <signal.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <fcntl.h>
  33 #include <errno.h>
  34
  35 #ifdef HAVE_POLL_H
  36 #include <poll.h>
  37 #else
  38 #include <pulsecore/poll.h>
  39 #endif
  40
  41 #ifndef HAVE_PIPE
  42 #include <pulsecore/pipe.h>
  43 #endif
  44
  45 #include <pulse/timeval.h>
  46 #include <pulse/xmalloc.h>
  47 #include <pulse/i18n.h>
  48
  49 #include <pulsecore/core-util.h>
  50 #include <pulsecore/llist.h>
  51 #include <pulsecore/log.h>
  52 #include <pulsecore/core-error.h>
  53 #include <pulsecore/winsock.h>
  54 #include <pulsecore/macro.h>
  55
  56 #include "mainloop.h"
  57
  58 struct pa_io_event {
  59     pa_mainloop *mainloop;
  60     pa_bool_t dead:1;
  61
  62     int fd;
  63     pa_io_event_flags_t events;
  64     struct pollfd *pollfd;
  65
  66     pa_io_event_cb_t callback;
  67     void *userdata;
  68     pa_io_event_destroy_cb_t destroy_callback;
  69
  70     PA_LLIST_FIELDS(pa_io_event);
  71 };
  72
  73 struct pa_time_event {
  74     pa_mainloop *mainloop;
  75     pa_bool_t dead:1;
  76
  77     pa_bool_t enabled:1;
  78     struct timeval timeval;
  79
  80     pa_time_event_cb_t callback;
  81     void *userdata;
  82     pa_time_event_destroy_cb_t destroy_callback;
  83
  84     PA_LLIST_FIELDS(pa_time_event);
  85 };
  86
  87 struct pa_defer_event {
  88     pa_mainloop *mainloop;
  89     pa_bool_t dead:1;
  90
  91     pa_bool_t enabled:1;
  92
  93     pa_defer_event_cb_t callback;
  94     void *userdata;
  95     pa_defer_event_destroy_cb_t destroy_callback;
  96
  97     PA_LLIST_FIELDS(pa_defer_event);
  98 };
  99
 100 struct pa_mainloop {
 101     PA_LLIST_HEAD(pa_io_event, io_events);
 102     PA_LLIST_HEAD(pa_time_event, time_events);
 103     PA_LLIST_HEAD(pa_defer_event, defer_events);
 104
 105     unsigned n_enabled_defer_events, n_enabled_time_events, n_io_events;
 106     unsigned io_events_please_scan, time_events_please_scan, defer_events_please_scan;
 107
 108     pa_bool_t rebuild_pollfds:1;
 109     struct pollfd *pollfds;
 110     unsigned max_pollfds, n_pollfds;
 111
 112     int prepared_timeout;
 113     pa_time_event *cached_next_time_event;
 114
 115     pa_mainloop_api api;
 116
 117     int retval;
 118     pa_bool_t quit:1;
 119
 120     pa_bool_t wakeup_requested:1;
 121     int wakeup_pipe[2];
 122     int wakeup_pipe_type;
 123
 124     enum {
 125         STATE_PASSIVE,
 126         STATE_PREPARED,
 127         STATE_POLLING,
 128         STATE_POLLED,
 129         STATE_QUIT
 130     } state;
 131
 132     pa_poll_func poll_func;
 133     void *poll_func_userdata;
 134     int poll_func_ret;
 135 };
 136
 137 static short map_flags_to_libc(pa_io_event_flags_t flags) {
 138     return (short)
 139         ((flags & PA_IO_EVENT_INPUT ? POLLIN : 0) |
 140          (flags & PA_IO_EVENT_OUTPUT ? POLLOUT : 0) |
 141          (flags & PA_IO_EVENT_ERROR ? POLLERR : 0) |
 142          (flags & PA_IO_EVENT_HANGUP ? POLLHUP : 0));
 143 }
 144
 145 static pa_io_event_flags_t map_flags_from_libc(short flags) {
 146     return
 147         (flags & POLLIN ? PA_IO_EVENT_INPUT : 0) |
 148         (flags & POLLOUT ? PA_IO_EVENT_OUTPUT : 0) |
 149         (flags & POLLERR ? PA_IO_EVENT_ERROR : 0) |
 150         (flags & POLLHUP ? PA_IO_EVENT_HANGUP : 0);
 151 }
 152
 153 /* IO events */
 154 static pa_io_event* mainloop_io_new(
 155         pa_mainloop_api*a,
 156         int fd,
 157         pa_io_event_flags_t events,
 158         pa_io_event_cb_t callback,
 159         void *userdata) {
 160
 161     pa_mainloop *m;
 162     pa_io_event *e;
 163
 164     pa_assert(a);
 165     pa_assert(a->userdata);
 166     pa_assert(fd >= 0);
 167     pa_assert(callback);
 168
 169     m = a->userdata;
 170     pa_assert(a == &m->api);
 171
 172     e = pa_xnew(pa_io_event, 1);
 173     e->mainloop = m;
 174     e->dead = FALSE;
 175
 176     e->fd = fd;
 177     e->events = events;
 178     e->pollfd = NULL;
 179
 180     e->callback = callback;
 181     e->userdata = userdata;
 182     e->destroy_callback = NULL;
 183
 184 #ifdef OS_IS_WIN32
 185     {
 186         fd_set xset;
 187         struct timeval tv;
 188
 189         tv.tv_sec = 0;
 190         tv.tv_usec = 0;
 191
 192         FD_ZERO (&xset);
 193         FD_SET (fd, &xset);
 194
 195         if ((select((SELECT_TYPE_ARG1) fd, NULL, NULL, SELECT_TYPE_ARG234 &xset,
 196                     SELECT_TYPE_ARG5 &tv) == -1) &&
 197              (WSAGetLastError() == WSAENOTSOCK)) {
 198             pa_log_warn("Cannot monitor non-socket file descriptors.");
 199             e->dead = TRUE;
 200         }
 201     }
 202 #endif
 203
 204     PA_LLIST_PREPEND(pa_io_event, m->io_events, e);
 205     m->rebuild_pollfds = TRUE;
 206     m->n_io_events ++;
 207
 208     pa_mainloop_wakeup(m);
 209
 210     return e;
 211 }
 212
 213 static void mainloop_io_enable(pa_io_event *e, pa_io_event_flags_t events) {
 214     pa_assert(e);
 215     pa_assert(!e->dead);
 216
 217     if (e->events == events)
 218         return;
 219
 220     e->events = events;
 221
 222     if (e->pollfd)
 223         e->pollfd->events = map_flags_to_libc(events);
 224     else
 225         e->mainloop->rebuild_pollfds = TRUE;
 226
 227     pa_mainloop_wakeup(e->mainloop);
 228 }
 229
 230 static void mainloop_io_free(pa_io_event *e) {
 231     pa_assert(e);
 232     pa_assert(!e->dead);
 233
 234     e->dead = TRUE;
 235     e->mainloop->io_events_please_scan ++;
 236
 237     e->mainloop->n_io_events --;
 238     e->mainloop->rebuild_pollfds = TRUE;
 239
 240     pa_mainloop_wakeup(e->mainloop);
 241 }
 242
 243 static void mainloop_io_set_destroy(pa_io_event *e, pa_io_event_destroy_cb_t callback) {
 244     pa_assert(e);
 245
 246     e->destroy_callback = callback;
 247 }
 248
 249 /* Defer events */
 250 static pa_defer_event* mainloop_defer_new(
 251         pa_mainloop_api*a,
 252         pa_defer_event_cb_t callback,
 253         void *userdata) {
 254
 255     pa_mainloop *m;
 256     pa_defer_event *e;
 257
 258     pa_assert(a);
 259     pa_assert(a->userdata);
 260     pa_assert(callback);
 261
 262     m = a->userdata;
 263     pa_assert(a == &m->api);
 264
 265     e = pa_xnew(pa_defer_event, 1);
 266     e->mainloop = m;
 267     e->dead = FALSE;
 268
 269     e->enabled = TRUE;
 270     m->n_enabled_defer_events++;
 271
 272     e->callback = callback;
 273     e->userdata = userdata;
 274     e->destroy_callback = NULL;
 275
 276     PA_LLIST_PREPEND(pa_defer_event, m->defer_events, e);
 277
 278     pa_mainloop_wakeup(e->mainloop);
 279
 280     return e;
 281 }
 282
 283 static void mainloop_defer_enable(pa_defer_event *e, int b) {
 284     pa_assert(e);
 285     pa_assert(!e->dead);
 286
 287     if (e->enabled && !b) {
 288         pa_assert(e->mainloop->n_enabled_defer_events > 0);
 289         e->mainloop->n_enabled_defer_events--;
 290     } else if (!e->enabled && b) {
 291         e->mainloop->n_enabled_defer_events++;
 292         pa_mainloop_wakeup(e->mainloop);
 293     }
 294
 295     e->enabled = b;
 296 }
 297
 298 static void mainloop_defer_free(pa_defer_event *e) {
 299     pa_assert(e);
 300     pa_assert(!e->dead);
 301
 302     e->dead = TRUE;
 303     e->mainloop->defer_events_please_scan ++;
 304
 305     if (e->enabled) {
 306         pa_assert(e->mainloop->n_enabled_defer_events > 0);
 307         e->mainloop->n_enabled_defer_events--;
 308         e->enabled = FALSE;
 309     }
 310 }
 311
 312 static void mainloop_defer_set_destroy(pa_defer_event *e, pa_defer_event_destroy_cb_t callback) {
 313     pa_assert(e);
 314     pa_assert(!e->dead);
 315
 316     e->destroy_callback = callback;
 317 }
 318
 319 /* Time events */
 320 static pa_time_event* mainloop_time_new(
 321         pa_mainloop_api*a,
 322         const struct timeval *tv,
 323         pa_time_event_cb_t callback,
 324         void *userdata) {
 325
 326     pa_mainloop *m;
 327     pa_time_event *e;
 328
 329     pa_assert(a);
 330     pa_assert(a->userdata);
 331     pa_assert(callback);
 332
 333     m = a->userdata;
 334     pa_assert(a == &m->api);
 335
 336     e = pa_xnew(pa_time_event, 1);
 337     e->mainloop = m;
 338     e->dead = FALSE;
 339
 340     if ((e->enabled = !!tv)) {
 341         e->timeval = *tv;
 342
 343         m->n_enabled_time_events++;
 344
 345         if (m->cached_next_time_event) {
 346             pa_assert(m->cached_next_time_event->enabled);
 347
 348             if (pa_timeval_cmp(tv, &m->cached_next_time_event->timeval) < 0)
 349                 m->cached_next_time_event = e;
 350         }
 351     }
 352
 353     e->callback = callback;
 354     e->userdata = userdata;
 355     e->destroy_callback = NULL;
 356
 357     PA_LLIST_PREPEND(pa_time_event, m->time_events, e);
 358
 359     if (e->enabled)
 360         pa_mainloop_wakeup(m);
 361
 362     return e;
 363 }
 364
 365 static void mainloop_time_restart(pa_time_event *e, const struct timeval *tv) {
 366     pa_assert(e);
 367     pa_assert(!e->dead);
 368
 369     if (e->enabled && !tv) {
 370         pa_assert(e->mainloop->n_enabled_time_events > 0);
 371         e->mainloop->n_enabled_time_events--;
 372     } else if (!e->enabled && tv)
 373         e->mainloop->n_enabled_time_events++;
 374
 375     if ((e->enabled = !!tv)) {
 376         e->timeval = *tv;
 377         pa_mainloop_wakeup(e->mainloop);
 378     }
 379
 380     if (e->mainloop->cached_next_time_event && e->enabled) {
 381         pa_assert(e->mainloop->cached_next_time_event->enabled);
 382
 383         if (pa_timeval_cmp(tv, &e->mainloop->cached_next_time_event->timeval) < 0)
 384             e->mainloop->cached_next_time_event = e;
 385     } else if (e->mainloop->cached_next_time_event == e)
 386         e->mainloop->cached_next_time_event = NULL;
 387 }
 388
 389 static void mainloop_time_free(pa_time_event *e) {
 390     pa_assert(e);
 391     pa_assert(!e->dead);
 392
 393     e->dead = TRUE;
 394     e->mainloop->time_events_please_scan ++;
 395
 396     if (e->enabled) {
 397         pa_assert(e->mainloop->n_enabled_time_events > 0);
 398         e->mainloop->n_enabled_time_events--;
 399         e->enabled = FALSE;
 400     }
 401
 402     if (e->mainloop->cached_next_time_event == e)
 403         e->mainloop->cached_next_time_event = NULL;
 404
 405     /* no wakeup needed here. Think about it! */
 406 }
 407
 408 static void mainloop_time_set_destroy(pa_time_event *e, pa_time_event_destroy_cb_t callback) {
 409     pa_assert(e);
 410     pa_assert(!e->dead);
 411
 412     e->destroy_callback = callback;
 413 }
 414
 415 /* quit() */
 416
 417 static void mainloop_quit(pa_mainloop_api*a, int retval) {
 418     pa_mainloop *m;
 419
 420     pa_assert(a);
 421     pa_assert(a->userdata);
 422     m = a->userdata;
 423     pa_assert(a == &m->api);
 424
 425     pa_mainloop_quit(m, retval);
 426 }
 427
 428 static const pa_mainloop_api vtable = {
 429     .userdata = NULL,
 430
 431     .io_new= mainloop_io_new,
 432     .io_enable= mainloop_io_enable,
 433     .io_free= mainloop_io_free,
 434     .io_set_destroy= mainloop_io_set_destroy,
 435
 436     .time_new = mainloop_time_new,
 437     .time_restart = mainloop_time_restart,
 438     .time_free = mainloop_time_free,
 439     .time_set_destroy = mainloop_time_set_destroy,
 440
 441     .defer_new = mainloop_defer_new,
 442     .defer_enable = mainloop_defer_enable,
 443     .defer_free = mainloop_defer_free,
 444     .defer_set_destroy = mainloop_defer_set_destroy,
 445
 446     .quit = mainloop_quit,
 447 };
 448
 449 pa_mainloop *pa_mainloop_new(void) {
 450     pa_mainloop *m;
 451
 452     pa_init_i18n();
 453
 454     m = pa_xnew(pa_mainloop, 1);
 455
 456     m->wakeup_pipe_type = 0;
 457     if (pipe(m->wakeup_pipe) < 0) {
 458         pa_log_error("ERROR: cannot create wakeup pipe");
 459         pa_xfree(m);
 460         return NULL;
 461     }
 462
 463     pa_make_fd_nonblock(m->wakeup_pipe[0]);
 464     pa_make_fd_nonblock(m->wakeup_pipe[1]);
 465     pa_make_fd_cloexec(m->wakeup_pipe[0]);
 466     pa_make_fd_cloexec(m->wakeup_pipe[1]);
 467     m->wakeup_requested = FALSE;
 468
 469     PA_LLIST_HEAD_INIT(pa_io_event, m->io_events);
 470     PA_LLIST_HEAD_INIT(pa_time_event, m->time_events);
 471     PA_LLIST_HEAD_INIT(pa_defer_event, m->defer_events);
 472
 473     m->n_enabled_defer_events = m->n_enabled_time_events = m->n_io_events = 0;
 474     m->io_events_please_scan = m->time_events_please_scan = m->defer_events_please_scan = 0;
 475
 476     m->cached_next_time_event = NULL;
 477     m->prepared_timeout = 0;
 478
 479     m->pollfds = NULL;
 480     m->max_pollfds = m->n_pollfds = 0;
 481     m->rebuild_pollfds = TRUE;
 482
 483     m->quit = FALSE;
 484     m->retval = 0;
 485
 486     m->api = vtable;
 487     m->api.userdata = m;
 488
 489     m->state = STATE_PASSIVE;
 490
 491     m->poll_func = NULL;
 492     m->poll_func_userdata = NULL;
 493     m->poll_func_ret = -1;
 494
 495     return m;
 496 }
 497
 498 static void cleanup_io_events(pa_mainloop *m, pa_bool_t force) {
 499     pa_io_event *e;
 500
 501     e = m->io_events;
 502     while (e) {
 503         pa_io_event *n = e->next;
 504
 505         if (!force && m->io_events_please_scan <= 0)
 506             break;
 507
 508         if (force || e->dead) {
 509             PA_LLIST_REMOVE(pa_io_event, m->io_events, e);
 510
 511             if (e->dead) {
 512                 pa_assert(m->io_events_please_scan > 0);
 513                 m->io_events_please_scan--;
 514             }
 515
 516             if (e->destroy_callback)
 517                 e->destroy_callback(&m->api, e, e->userdata);
 518
 519             pa_xfree(e);
 520
 521             m->rebuild_pollfds = TRUE;
 522         }
 523
 524         e = n;
 525     }
 526
 527     pa_assert(m->io_events_please_scan == 0);
 528 }
 529
 530 static void cleanup_time_events(pa_mainloop *m, pa_bool_t force) {
 531     pa_time_event *e;
 532
 533     e = m->time_events;
 534     while (e) {
 535         pa_time_event *n = e->next;
 536
 537         if (!force && m->time_events_please_scan <= 0)
 538             break;
 539
 540         if (force || e->dead) {
 541             PA_LLIST_REMOVE(pa_time_event, m->time_events, e);
 542
 543             if (e->dead) {
 544                 pa_assert(m->time_events_please_scan > 0);
 545                 m->time_events_please_scan--;
 546             }
 547
 548             if (!e->dead && e->enabled) {
 549                 pa_assert(m->n_enabled_time_events > 0);
 550                 m->n_enabled_time_events--;
 551                 e->enabled = FALSE;
 552             }
 553
 554             if (e->destroy_callback)
 555                 e->destroy_callback(&m->api, e, e->userdata);
 556
 557             pa_xfree(e);
 558         }
 559
 560         e = n;
 561     }
 562
 563     pa_assert(m->time_events_please_scan == 0);
 564 }
 565
 566 static void cleanup_defer_events(pa_mainloop *m, pa_bool_t force) {
 567     pa_defer_event *e;
 568
 569     e = m->defer_events;
 570     while (e) {
 571         pa_defer_event *n = e->next;
 572
 573         if (!force && m->defer_events_please_scan <= 0)
 574             break;
 575
 576         if (force || e->dead) {
 577             PA_LLIST_REMOVE(pa_defer_event, m->defer_events, e);
 578
 579             if (e->dead) {
 580                 pa_assert(m->defer_events_please_scan > 0);
 581                 m->defer_events_please_scan--;
 582             }
 583
 584             if (!e->dead && e->enabled) {
 585                 pa_assert(m->n_enabled_defer_events > 0);
 586                 m->n_enabled_defer_events--;
 587                 e->enabled = FALSE;
 588             }
 589
 590             if (e->destroy_callback)
 591                 e->destroy_callback(&m->api, e, e->userdata);
 592
 593             pa_xfree(e);
 594         }
 595
 596         e = n;
 597     }
 598
 599     pa_assert(m->defer_events_please_scan == 0);
 600 }
 601
 602
 603 void pa_mainloop_free(pa_mainloop* m) {
 604     pa_assert(m);
 605
 606     cleanup_io_events(m, TRUE);
 607     cleanup_defer_events(m, TRUE);
 608     cleanup_time_events(m, TRUE);
 609
 610     pa_xfree(m->pollfds);
 611
 612     pa_close_pipe(m->wakeup_pipe);
 613
 614     pa_xfree(m);
 615 }
 616
 617 static void scan_dead(pa_mainloop *m) {
 618     pa_assert(m);
 619
 620     if (m->io_events_please_scan)
 621         cleanup_io_events(m, FALSE);
 622
 623     if (m->time_events_please_scan)
 624         cleanup_time_events(m, FALSE);
 625
 626     if (m->defer_events_please_scan)
 627         cleanup_defer_events(m, FALSE);
 628 }
 629
 630 static void rebuild_pollfds(pa_mainloop *m) {
 631     pa_io_event*e;
 632     struct pollfd *p;
 633     unsigned l;
 634
 635     l = m->n_io_events + 1;
 636     if (m->max_pollfds < l) {
 637         l *= 2;
 638         m->pollfds = pa_xrealloc(m->pollfds, sizeof(struct pollfd)*l);
 639         m->max_pollfds = l;
 640     }
 641
 642     m->n_pollfds = 0;
 643     p = m->pollfds;
 644
 645     if (m->wakeup_pipe[0] >= 0) {
 646         m->pollfds[0].fd = m->wakeup_pipe[0];
 647         m->pollfds[0].events = POLLIN;
 648         m->pollfds[0].revents = 0;
 649         p++;
 650         m->n_pollfds++;
 651     }
 652
 653     for (e = m->io_events; e; e = e->next) {
 654         if (e->dead) {
 655             e->pollfd = NULL;
 656             continue;
 657         }
 658
 659         e->pollfd = p;
 660         p->fd = e->fd;
 661         p->events = map_flags_to_libc(e->events);
 662         p->revents = 0;
 663
 664         p++;
 665         m->n_pollfds++;
 666     }
 667
 668     m->rebuild_pollfds = FALSE;
 669 }
 670
 671 static int dispatch_pollfds(pa_mainloop *m) {
 672     pa_io_event *e;
 673     int r = 0, k;
 674
 675     pa_assert(m->poll_func_ret > 0);
 676
 677     for (e = m->io_events, k = m->poll_func_ret; e && !m->quit && k > 0; e = e->next) {
 678         if (e->dead || !e->pollfd || !e->pollfd->revents)
 679             continue;
 680
 681         pa_assert(e->pollfd->fd == e->fd);
 682         pa_assert(e->callback);
 683         e->callback(&m->api, e, e->fd, map_flags_from_libc(e->pollfd->revents), e->userdata);
 684         e->pollfd->revents = 0;
 685         r++;
 686
 687         k--;
 688     }
 689
 690     return r;
 691 }
 692
 693 static int dispatch_defer(pa_mainloop *m) {
 694     pa_defer_event *e;
 695     int r = 0;
 696
 697     if (m->n_enabled_defer_events <= 0)
 698         return 0;
 699
 700     for (e = m->defer_events; e && !m->quit; e = e->next) {
 701         if (e->dead || !e->enabled)
 702             continue;
 703
 704         pa_assert(e->callback);
 705         e->callback(&m->api, e, e->userdata);
 706         r++;
 707     }
 708
 709     return r;
 710 }
 711
 712 static pa_time_event* find_next_time_event(pa_mainloop *m) {
 713     pa_time_event *t, *n = NULL;
 714     pa_assert(m);
 715
 716     if (m->cached_next_time_event)
 717         return m->cached_next_time_event;
 718
 719     for (t = m->time_events; t; t = t->next) {
 720
 721         if (t->dead || !t->enabled)
 722             continue;
 723
 724         if (!n || pa_timeval_cmp(&t->timeval, &n->timeval) < 0) {
 725             n = t;
 726
 727             /* Shortcut for tv = { 0, 0 } */
 728             if (n->timeval.tv_sec <= 0)
 729                 break;
 730         }
 731     }
 732
 733     m->cached_next_time_event = n;
 734     return n;
 735 }
 736
 737 static int calc_next_timeout(pa_mainloop *m) {
 738     pa_time_event *t;
 739     struct timeval now;
 740     pa_usec_t usec;
 741
 742     if (!m->n_enabled_time_events)
 743         return -1;
 744
 745     t = find_next_time_event(m);
 746     pa_assert(t);
 747
 748     if (t->timeval.tv_sec <= 0)
 749         return 0;
 750
 751     pa_gettimeofday(&now);
 752
 753     if (pa_timeval_cmp(&t->timeval, &now) <= 0)
 754         return 0;
 755
 756     usec = pa_timeval_diff(&t->timeval, &now);
 757     return (int) (usec / 1000);
 758 }
 759
 760 static int dispatch_timeout(pa_mainloop *m) {
 761     pa_time_event *e;
 762     struct timeval now;
 763     int r = 0;
 764     pa_assert(m);
 765
 766     if (m->n_enabled_time_events <= 0)
 767         return 0;
 768
 769     pa_gettimeofday(&now);
 770
 771     for (e = m->time_events; e && !m->quit; e = e->next) {
 772
 773         if (e->dead || !e->enabled)
 774             continue;
 775
 776         if (pa_timeval_cmp(&e->timeval, &now) <= 0) {
 777             pa_assert(e->callback);
 778
 779             /* Disable time event */
 780             mainloop_time_restart(e, NULL);
 781
 782             e->callback(&m->api, e, &e->timeval, e->userdata);
 783
 784             r++;
 785         }
 786     }
 787
 788     return r;
 789 }
 790
 791 void pa_mainloop_wakeup(pa_mainloop *m) {
 792     char c = 'W';
 793     pa_assert(m);
 794
 795     if (m->wakeup_pipe[1] >= 0 && m->state == STATE_POLLING) {
 796         pa_write(m->wakeup_pipe[1], &c, sizeof(c), &m->wakeup_pipe_type);
 797         m->wakeup_requested++;
 798     }
 799 }
 800
 801 static void clear_wakeup(pa_mainloop *m) {
 802     char c[10];
 803
 804     pa_assert(m);
 805
 806     if (m->wakeup_pipe[0] < 0)
 807         return;
 808
 809     if (m->wakeup_requested) {
 810         while (pa_read(m->wakeup_pipe[0], &c, sizeof(c), &m->wakeup_pipe_type) == sizeof(c));
 811         m->wakeup_requested = 0;
 812     }
 813 }
 814
 815 int pa_mainloop_prepare(pa_mainloop *m, int timeout) {
 816     pa_assert(m);
 817     pa_assert(m->state == STATE_PASSIVE);
 818
 819     clear_wakeup(m);
 820     scan_dead(m);
 821
 822     if (m->quit)
 823         goto quit;
 824
 825     if (m->n_enabled_defer_events <= 0) {
 826         if (m->rebuild_pollfds)
 827             rebuild_pollfds(m);
 828
 829         m->prepared_timeout = calc_next_timeout(m);
 830         if (timeout >= 0 && (timeout < m->prepared_timeout || m->prepared_timeout < 0))
 831             m->prepared_timeout = timeout;
 832     }
 833
 834     m->state = STATE_PREPARED;
 835     return 0;
 836
 837 quit:
 838     m->state = STATE_QUIT;
 839     return -2;
 840 }
 841
 842 int pa_mainloop_poll(pa_mainloop *m) {
 843     pa_assert(m);
 844     pa_assert(m->state == STATE_PREPARED);
 845
 846     if (m->quit)
 847         goto quit;
 848
 849     m->state = STATE_POLLING;
 850
 851     if (m->n_enabled_defer_events )
 852         m->poll_func_ret = 0;
 853     else {
 854         pa_assert(!m->rebuild_pollfds);
 855
 856         if (m->poll_func)
 857             m->poll_func_ret = m->poll_func(m->pollfds, m->n_pollfds, m->prepared_timeout, m->poll_func_userdata);
 858         else
 859             m->poll_func_ret = poll(m->pollfds, m->n_pollfds, m->prepared_timeout);
 860
 861         if (m->poll_func_ret < 0) {
 862             if (errno == EINTR)
 863                 m->poll_func_ret = 0;
 864             else
 865                 pa_log("poll(): %s", pa_cstrerror(errno));
 866         }
 867     }
 868
 869     m->state = m->poll_func_ret < 0 ? STATE_PASSIVE : STATE_POLLED;
 870     return m->poll_func_ret;
 871
 872 quit:
 873     m->state = STATE_QUIT;
 874     return -2;
 875 }
 876
 877 int pa_mainloop_dispatch(pa_mainloop *m) {
 878     int dispatched = 0;
 879
 880     pa_assert(m);
 881     pa_assert(m->state == STATE_POLLED);
 882
 883     if (m->quit)
 884         goto quit;
 885
 886     if (m->n_enabled_defer_events)
 887         dispatched += dispatch_defer(m);
 888     else {
 889         if (m->n_enabled_time_events)
 890             dispatched += dispatch_timeout(m);
 891
 892         if (m->quit)
 893             goto quit;
 894
 895         if (m->poll_func_ret > 0)
 896             dispatched += dispatch_pollfds(m);
 897     }
 898
 899     if (m->quit)
 900         goto quit;
 901
 902     m->state = STATE_PASSIVE;
 903
 904     return dispatched;
 905
 906 quit:
 907     m->state = STATE_QUIT;
 908     return -2;
 909 }
 910
 911 int pa_mainloop_get_retval(pa_mainloop *m) {
 912     pa_assert(m);
 913     return m->retval;
 914 }
 915
 916 int pa_mainloop_iterate(pa_mainloop *m, int block, int *retval) {
 917     int r;
 918     pa_assert(m);
 919
 920     if ((r = pa_mainloop_prepare(m, block ? -1 : 0)) < 0)
 921         goto quit;
 922
 923     if ((r = pa_mainloop_poll(m)) < 0)
 924         goto quit;
 925
 926     if ((r = pa_mainloop_dispatch(m)) < 0)
 927         goto quit;
 928
 929     return r;
 930
 931 quit:
 932
 933     if ((r == -2) && retval)
 934         *retval = pa_mainloop_get_retval(m);
 935     return r;
 936 }
 937
 938 int pa_mainloop_run(pa_mainloop *m, int *retval) {
 939     int r;
 940
 941     while ((r = pa_mainloop_iterate(m, 1, retval)) >= 0);
 942
 943     if (r == -2)
 944         return 1;
 945     else if (r < 0)
 946         return -1;
 947     else
 948         return 0;
 949 }
 950
 951 void pa_mainloop_quit(pa_mainloop *m, int retval) {
 952     pa_assert(m);
 953
 954     m->quit = TRUE;
 955     m->retval = retval;
 956     pa_mainloop_wakeup(m);
 957 }
 958
 959 pa_mainloop_api* pa_mainloop_get_api(pa_mainloop*m) {
 960     pa_assert(m);
 961     return &m->api;
 962 }
 963
 964 void pa_mainloop_set_poll_func(pa_mainloop *m, pa_poll_func poll_func, void *userdata) {
 965     pa_assert(m);
 966
 967     m->poll_func = poll_func;
 968     m->poll_func_userdata = userdata;
 969 }