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

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <pulse/xmalloc.h>
  27 #include <pulse/timeval.h>
  28
  29 #include <pulsecore/idxset.h>
  30 #include <pulsecore/core-util.h>
  31 #include <pulsecore/log.h>
  32 #include <pulsecore/llist.h>
  33
  34 #include <glib.h>
  35 #include "glib-mainloop.h"
  36
  37 struct pa_io_event  {
  38     pa_glib_mainloop *mainloop;
  39     int dead;
  40
  41     GPollFD poll_fd;
  42     int poll_fd_added;
  43
  44     pa_io_event_cb_t callback;
  45     void *userdata;
  46     pa_io_event_destroy_cb_t destroy_callback;
  47
  48     PA_LLIST_FIELDS(pa_io_event);
  49 };
  50
  51 struct pa_time_event {
  52     pa_glib_mainloop *mainloop;
  53     int dead;
  54
  55     int enabled;
  56     struct timeval timeval;
  57
  58     pa_time_event_cb_t callback;
  59     void *userdata;
  60     pa_time_event_destroy_cb_t destroy_callback;
  61
  62     PA_LLIST_FIELDS(pa_time_event);
  63 };
  64
  65 struct pa_defer_event {
  66     pa_glib_mainloop *mainloop;
  67     int dead;
  68
  69     int enabled;
  70
  71     pa_defer_event_cb_t callback;
  72     void *userdata;
  73     pa_defer_event_destroy_cb_t destroy_callback;
  74
  75     PA_LLIST_FIELDS(pa_defer_event);
  76 };
  77
  78 struct pa_glib_mainloop {
  79     GSource source;
  80
  81     pa_mainloop_api api;
  82     GMainContext *context;
  83
  84     PA_LLIST_HEAD(pa_io_event, io_events);
  85     PA_LLIST_HEAD(pa_time_event, time_events);
  86     PA_LLIST_HEAD(pa_defer_event, defer_events);
  87
  88     int n_enabled_defer_events, n_enabled_time_events;
  89     int io_events_please_scan, time_events_please_scan, defer_events_please_scan;
  90
  91     pa_time_event *cached_next_time_event;
  92 };
  93
  94 static void cleanup_io_events(pa_glib_mainloop *g, int force) {
  95     pa_io_event *e;
  96
  97     e = g->io_events;
  98     while (e) {
  99         pa_io_event *n = e->next;
 100
 101         if (!force && g->io_events_please_scan <= 0)
 102             break;
 103
 104         if (force || e->dead) {
 105             PA_LLIST_REMOVE(pa_io_event, g->io_events, e);
 106
 107             if (e->dead) {
 108                 g_assert(g->io_events_please_scan > 0);
 109                 g->io_events_please_scan--;
 110             }
 111
 112             if (e->poll_fd_added)
 113                 g_source_remove_poll(&g->source, &e->poll_fd);
 114
 115             if (e->destroy_callback)
 116                 e->destroy_callback(&g->api, e, e->userdata);
 117
 118             pa_xfree(e);
 119         }
 120
 121         e = n;
 122     }
 123
 124     g_assert(g->io_events_please_scan == 0);
 125 }
 126
 127 static void cleanup_time_events(pa_glib_mainloop *g, int force) {
 128     pa_time_event *e;
 129
 130     e = g->time_events;
 131     while (e) {
 132         pa_time_event *n = e->next;
 133
 134         if (!force && g->time_events_please_scan <= 0)
 135             break;
 136
 137         if (force || e->dead) {
 138             PA_LLIST_REMOVE(pa_time_event, g->time_events, e);
 139
 140             if (e->dead) {
 141                 g_assert(g->time_events_please_scan > 0);
 142                 g->time_events_please_scan--;
 143             }
 144
 145             if (!e->dead && e->enabled) {
 146                 g_assert(g->n_enabled_time_events > 0);
 147                 g->n_enabled_time_events--;
 148             }
 149
 150             if (e->destroy_callback)
 151                 e->destroy_callback(&g->api, e, e->userdata);
 152
 153             pa_xfree(e);
 154         }
 155
 156         e = n;
 157     }
 158
 159     g_assert(g->time_events_please_scan == 0);
 160 }
 161
 162 static void cleanup_defer_events(pa_glib_mainloop *g, int force) {
 163     pa_defer_event *e;
 164
 165     e = g->defer_events;
 166     while (e) {
 167         pa_defer_event *n = e->next;
 168
 169         if (!force && g->defer_events_please_scan <= 0)
 170             break;
 171
 172         if (force || e->dead) {
 173             PA_LLIST_REMOVE(pa_defer_event, g->defer_events, e);
 174
 175             if (e->dead) {
 176                 g_assert(g->defer_events_please_scan > 0);
 177                 g->defer_events_please_scan--;
 178             }
 179
 180             if (!e->dead && e->enabled) {
 181                 g_assert(g->n_enabled_defer_events > 0);
 182                 g->n_enabled_defer_events--;
 183             }
 184
 185             if (e->destroy_callback)
 186                 e->destroy_callback(&g->api, e, e->userdata);
 187
 188             pa_xfree(e);
 189         }
 190
 191         e = n;
 192     }
 193
 194     g_assert(g->defer_events_please_scan == 0);
 195 }
 196
 197 static gushort map_flags_to_glib(pa_io_event_flags_t flags) {
 198     return (gushort)
 199         ((flags & PA_IO_EVENT_INPUT ? G_IO_IN : 0) |
 200          (flags & PA_IO_EVENT_OUTPUT ? G_IO_OUT : 0) |
 201          (flags & PA_IO_EVENT_ERROR ? G_IO_ERR : 0) |
 202          (flags & PA_IO_EVENT_HANGUP ? G_IO_HUP : 0));
 203 }
 204
 205 static pa_io_event_flags_t map_flags_from_glib(gushort flags) {
 206     return
 207         (flags & G_IO_IN ? PA_IO_EVENT_INPUT : 0) |
 208         (flags & G_IO_OUT ? PA_IO_EVENT_OUTPUT : 0) |
 209         (flags & G_IO_ERR ? PA_IO_EVENT_ERROR : 0) |
 210         (flags & G_IO_HUP ? PA_IO_EVENT_HANGUP : 0);
 211 }
 212
 213 static pa_io_event* glib_io_new(
 214         pa_mainloop_api*m,
 215         int fd,
 216         pa_io_event_flags_t f,
 217         pa_io_event_cb_t cb,
 218         void *userdata) {
 219
 220     pa_io_event *e;
 221     pa_glib_mainloop *g;
 222
 223     g_assert(m);
 224     g_assert(m->userdata);
 225     g_assert(fd >= 0);
 226     g_assert(cb);
 227
 228     g = m->userdata;
 229
 230     e = pa_xnew(pa_io_event, 1);
 231     e->mainloop = g;
 232     e->dead = 0;
 233
 234     e->poll_fd.fd = fd;
 235     e->poll_fd.events = map_flags_to_glib(f);
 236     e->poll_fd.revents = 0;
 237
 238     e->callback = cb;
 239     e->userdata = userdata;
 240     e->destroy_callback = NULL;
 241
 242     PA_LLIST_PREPEND(pa_io_event, g->io_events, e);
 243
 244     g_source_add_poll(&g->source, &e->poll_fd);
 245     e->poll_fd_added = 1;
 246
 247     return e;
 248 }
 249
 250 static void glib_io_enable(pa_io_event*e, pa_io_event_flags_t f) {
 251     g_assert(e);
 252     g_assert(!e->dead);
 253
 254     e->poll_fd.events = map_flags_to_glib(f);
 255 }
 256
 257 static void glib_io_free(pa_io_event*e) {
 258     g_assert(e);
 259     g_assert(!e->dead);
 260
 261     e->dead = 1;
 262     e->mainloop->io_events_please_scan++;
 263
 264     if (e->poll_fd_added) {
 265         g_source_remove_poll(&e->mainloop->source, &e->poll_fd);
 266         e->poll_fd_added = 0;
 267     }
 268 }
 269
 270 static void glib_io_set_destroy(pa_io_event*e, pa_io_event_destroy_cb_t cb) {
 271     g_assert(e);
 272     g_assert(!e->dead);
 273
 274     e->destroy_callback = cb;
 275 }
 276
 277 /* Time sources */
 278
 279 static pa_time_event* glib_time_new(
 280         pa_mainloop_api*m,
 281         const struct timeval *tv,
 282         pa_time_event_cb_t cb,
 283         void *userdata) {
 284
 285     pa_glib_mainloop *g;
 286     pa_time_event *e;
 287
 288     g_assert(m);
 289     g_assert(m->userdata);
 290     g_assert(cb);
 291
 292     g = m->userdata;
 293
 294     e = pa_xnew(pa_time_event, 1);
 295     e->mainloop = g;
 296     e->dead = 0;
 297
 298     if ((e->enabled = !!tv)) {
 299         e->timeval = *tv;
 300         g->n_enabled_time_events++;
 301
 302         if (g->cached_next_time_event) {
 303             g_assert(g->cached_next_time_event->enabled);
 304
 305             if (pa_timeval_cmp(tv, &g->cached_next_time_event->timeval) < 0)
 306                 g->cached_next_time_event = e;
 307         }
 308     }
 309
 310     e->callback = cb;
 311     e->userdata = userdata;
 312     e->destroy_callback = NULL;
 313
 314     PA_LLIST_PREPEND(pa_time_event, g->time_events, e);
 315
 316     return e;
 317 }
 318
 319 static void glib_time_restart(pa_time_event*e, const struct timeval *tv) {
 320     g_assert(e);
 321     g_assert(!e->dead);
 322
 323     if (e->enabled && !tv) {
 324         g_assert(e->mainloop->n_enabled_time_events > 0);
 325         e->mainloop->n_enabled_time_events--;
 326     } else if (!e->enabled && tv)
 327         e->mainloop->n_enabled_time_events++;
 328
 329     if ((e->enabled = !!tv))
 330         e->timeval = *tv;
 331
 332     if (e->mainloop->cached_next_time_event && e->enabled) {
 333         g_assert(e->mainloop->cached_next_time_event->enabled);
 334
 335         if (pa_timeval_cmp(tv, &e->mainloop->cached_next_time_event->timeval) < 0)
 336             e->mainloop->cached_next_time_event = e;
 337     } else if (e->mainloop->cached_next_time_event == e)
 338         e->mainloop->cached_next_time_event = NULL;
 339 }
 340
 341 static void glib_time_free(pa_time_event *e) {
 342     g_assert(e);
 343     g_assert(!e->dead);
 344
 345     e->dead = 1;
 346     e->mainloop->time_events_please_scan++;
 347
 348     if (e->enabled)
 349         e->mainloop->n_enabled_time_events--;
 350
 351     if (e->mainloop->cached_next_time_event == e)
 352         e->mainloop->cached_next_time_event = NULL;
 353 }
 354
 355 static void glib_time_set_destroy(pa_time_event *e, pa_time_event_destroy_cb_t cb) {
 356     g_assert(e);
 357     g_assert(!e->dead);
 358
 359     e->destroy_callback = cb;
 360 }
 361
 362 /* Deferred sources */
 363
 364 static pa_defer_event* glib_defer_new(
 365         pa_mainloop_api*m,
 366         pa_defer_event_cb_t cb,
 367         void *userdata) {
 368
 369     pa_defer_event *e;
 370     pa_glib_mainloop *g;
 371
 372     g_assert(m);
 373     g_assert(m->userdata);
 374     g_assert(cb);
 375
 376     g = m->userdata;
 377
 378     e = pa_xnew(pa_defer_event, 1);
 379     e->mainloop = g;
 380     e->dead = 0;
 381
 382     e->enabled = 1;
 383     g->n_enabled_defer_events++;
 384
 385     e->callback = cb;
 386     e->userdata = userdata;
 387     e->destroy_callback = NULL;
 388
 389     PA_LLIST_PREPEND(pa_defer_event, g->defer_events, e);
 390     return e;
 391 }
 392
 393 static void glib_defer_enable(pa_defer_event *e, int b) {
 394     g_assert(e);
 395     g_assert(!e->dead);
 396
 397     if (e->enabled && !b) {
 398         g_assert(e->mainloop->n_enabled_defer_events > 0);
 399         e->mainloop->n_enabled_defer_events--;
 400     } else if (!e->enabled && b)
 401         e->mainloop->n_enabled_defer_events++;
 402
 403     e->enabled = b;
 404 }
 405
 406 static void glib_defer_free(pa_defer_event *e) {
 407     g_assert(e);
 408     g_assert(!e->dead);
 409
 410     e->dead = 1;
 411     e->mainloop->defer_events_please_scan++;
 412
 413     if (e->enabled) {
 414         g_assert(e->mainloop->n_enabled_defer_events > 0);
 415         e->mainloop->n_enabled_defer_events--;
 416     }
 417 }
 418
 419 static void glib_defer_set_destroy(pa_defer_event *e, pa_defer_event_destroy_cb_t cb) {
 420     g_assert(e);
 421     g_assert(!e->dead);
 422
 423     e->destroy_callback = cb;
 424 }
 425
 426 /* quit() */
 427
 428 static void glib_quit(pa_mainloop_api*a, int retval) {
 429
 430     g_warning("quit() ignored");
 431
 432     /* NOOP */
 433 }
 434
 435 static pa_time_event* find_next_time_event(pa_glib_mainloop *g) {
 436     pa_time_event *t, *n = NULL;
 437     g_assert(g);
 438
 439     if (g->cached_next_time_event)
 440         return g->cached_next_time_event;
 441
 442     for (t = g->time_events; t; t = t->next) {
 443
 444         if (t->dead || !t->enabled)
 445             continue;
 446
 447         if (!n || pa_timeval_cmp(&t->timeval, &n->timeval) < 0) {
 448             n = t;
 449
 450             /* Shortcut for tv = { 0, 0 } */
 451             if (n->timeval.tv_sec <= 0)
 452                 break;
 453         }
 454     }
 455
 456     g->cached_next_time_event = n;
 457     return n;
 458 }
 459
 460 static void scan_dead(pa_glib_mainloop *g) {
 461     g_assert(g);
 462
 463     if (g->io_events_please_scan)
 464         cleanup_io_events(g, 0);
 465
 466     if (g->time_events_please_scan)
 467         cleanup_time_events(g, 0);
 468
 469     if (g->defer_events_please_scan)
 470         cleanup_defer_events(g, 0);
 471 }
 472
 473 static gboolean prepare_func(GSource *source, gint *timeout) {
 474     pa_glib_mainloop *g = (pa_glib_mainloop*) source;
 475
 476     g_assert(g);
 477     g_assert(timeout);
 478
 479     scan_dead(g);
 480
 481     if (g->n_enabled_defer_events) {
 482         *timeout = 0;
 483         return TRUE;
 484     } else if (g->n_enabled_time_events) {
 485         pa_time_event *t;
 486         GTimeVal now;
 487         struct timeval tvnow;
 488         pa_usec_t usec;
 489
 490         t = find_next_time_event(g);
 491         g_assert(t);
 492
 493         g_source_get_current_time(source, &now);
 494         tvnow.tv_sec = now.tv_sec;
 495         tvnow.tv_usec = now.tv_usec;
 496
 497         if (pa_timeval_cmp(&t->timeval, &tvnow) <= 0) {
 498             *timeout = 0;
 499             return TRUE;
 500         }
 501         usec = pa_timeval_diff(&t->timeval, &tvnow);
 502         *timeout = (gint) (usec / 1000);
 503     } else
 504         *timeout = -1;
 505
 506     return FALSE;
 507 }
 508 static gboolean check_func(GSource *source) {
 509     pa_glib_mainloop *g = (pa_glib_mainloop*) source;
 510     pa_io_event *e;
 511
 512     g_assert(g);
 513
 514     if (g->n_enabled_defer_events)
 515         return TRUE;
 516     else if (g->n_enabled_time_events) {
 517         pa_time_event *t;
 518         GTimeVal now;
 519         struct timeval tvnow;
 520
 521         t = find_next_time_event(g);
 522         g_assert(t);
 523
 524         g_source_get_current_time(source, &now);
 525         tvnow.tv_sec = now.tv_sec;
 526         tvnow.tv_usec = now.tv_usec;
 527
 528         if (pa_timeval_cmp(&t->timeval, &tvnow) <= 0)
 529             return TRUE;
 530     }
 531
 532     for (e = g->io_events; e; e = e->next)
 533         if (!e->dead && e->poll_fd.revents != 0)
 534             return TRUE;
 535
 536     return FALSE;
 537 }
 538
 539 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer userdata) {
 540     pa_glib_mainloop *g = (pa_glib_mainloop*) source;
 541     pa_io_event *e;
 542
 543     g_assert(g);
 544
 545     if (g->n_enabled_defer_events) {
 546         pa_defer_event *d;
 547
 548         for (d = g->defer_events; d; d = d->next) {
 549             if (d->dead || !d->enabled)
 550                 continue;
 551
 552             break;
 553         }
 554
 555         g_assert(d);
 556
 557         d->callback(&g->api, d, d->userdata);
 558         return TRUE;
 559     }
 560
 561     if (g->n_enabled_time_events) {
 562         GTimeVal now;
 563         struct timeval tvnow;
 564         pa_time_event *t;
 565
 566         t = find_next_time_event(g);
 567         g_assert(t);
 568
 569         g_source_get_current_time(source, &now);
 570         tvnow.tv_sec = now.tv_sec;
 571         tvnow.tv_usec = now.tv_usec;
 572
 573         if (pa_timeval_cmp(&t->timeval, &tvnow) <= 0) {
 574
 575             /* Disable time event */
 576             glib_time_restart(t, NULL);
 577
 578             t->callback(&g->api, t, &t->timeval, t->userdata);
 579             return TRUE;
 580         }
 581     }
 582
 583     for (e = g->io_events; e; e = e->next)
 584         if (!e->dead && e->poll_fd.revents != 0) {
 585             e->callback(&g->api, e, e->poll_fd.fd, map_flags_from_glib(e->poll_fd.revents), e->userdata);
 586             e->poll_fd.revents = 0;
 587             return TRUE;
 588         }
 589
 590     return FALSE;
 591 }
 592
 593 static const pa_mainloop_api vtable = {
 594     .userdata = NULL,
 595
 596     .io_new = glib_io_new,
 597     .io_enable = glib_io_enable,
 598     .io_free = glib_io_free,
 599     .io_set_destroy= glib_io_set_destroy,
 600
 601     .time_new = glib_time_new,
 602     .time_restart = glib_time_restart,
 603     .time_free = glib_time_free,
 604     .time_set_destroy = glib_time_set_destroy,
 605
 606     .defer_new = glib_defer_new,
 607     .defer_enable = glib_defer_enable,
 608     .defer_free = glib_defer_free,
 609     .defer_set_destroy = glib_defer_set_destroy,
 610
 611     .quit = glib_quit,
 612 };
 613
 614 pa_glib_mainloop *pa_glib_mainloop_new(GMainContext *c) {
 615     pa_glib_mainloop *g;
 616
 617     static GSourceFuncs source_funcs = {
 618         prepare_func,
 619         check_func,
 620         dispatch_func,
 621         NULL,
 622         NULL,
 623         NULL
 624     };
 625
 626     g = (pa_glib_mainloop*) g_source_new(&source_funcs, sizeof(pa_glib_mainloop));
 627     g_main_context_ref(g->context = c ? c : g_main_context_default());
 628
 629     g->api = vtable;
 630     g->api.userdata = g;
 631
 632     PA_LLIST_HEAD_INIT(pa_io_event, g->io_events);
 633     PA_LLIST_HEAD_INIT(pa_time_event, g->time_events);
 634     PA_LLIST_HEAD_INIT(pa_defer_event, g->defer_events);
 635
 636     g->n_enabled_defer_events = g->n_enabled_time_events = 0;
 637     g->io_events_please_scan = g->time_events_please_scan = g->defer_events_please_scan = 0;
 638
 639     g->cached_next_time_event = NULL;
 640
 641     g_source_attach(&g->source, g->context);
 642     g_source_set_can_recurse(&g->source, FALSE);
 643
 644     return g;
 645 }
 646
 647 void pa_glib_mainloop_free(pa_glib_mainloop* g) {
 648     g_assert(g);
 649
 650     cleanup_io_events(g, 1);
 651     cleanup_defer_events(g, 1);
 652     cleanup_time_events(g, 1);
 653
 654     g_main_context_unref(g->context);
 655     g_source_destroy(&g->source);
 656     g_source_unref(&g->source);
 657 }
 658
 659 pa_mainloop_api* pa_glib_mainloop_get_api(pa_glib_mainloop *g) {
 660     g_assert(g);
 661
 662     return &g->api;
 663 }