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/core-util.h>
  30 #include <pulsecore/log.h>
  31 #include <pulsecore/llist.h>
  32
  33 #include <glib.h>
  34 #include "glib-mainloop.h"
  35
  36 struct pa_io_event {
  37     pa_glib_mainloop *mainloop;
  38     int dead;
  39
  40     GPollFD poll_fd;
  41     int poll_fd_added;
  42
  43     pa_io_event_cb_t callback;
  44     void *userdata;
  45     pa_io_event_destroy_cb_t destroy_callback;
  46
  47     PA_LLIST_FIELDS(pa_io_event);
  48 };
  49
  50 struct pa_time_event {
  51     pa_glib_mainloop *mainloop;
  52     int dead;
  53
  54     int enabled;
  55     struct timeval timeval;
  56
  57     pa_time_event_cb_t callback;
  58     void *userdata;
  59     pa_time_event_destroy_cb_t destroy_callback;
  60
  61     PA_LLIST_FIELDS(pa_time_event);
  62 };
  63
  64 struct pa_defer_event {
  65     pa_glib_mainloop *mainloop;
  66     int dead;
  67
  68     int enabled;
  69
  70     pa_defer_event_cb_t callback;
  71     void *userdata;
  72     pa_defer_event_destroy_cb_t destroy_callback;
  73
  74     PA_LLIST_FIELDS(pa_defer_event);
  75 };
  76
  77 struct pa_glib_mainloop {
  78     GSource source;
  79
  80     pa_mainloop_api api;
  81     GMainContext *context;
  82
  83     PA_LLIST_HEAD(pa_io_event, io_events);
  84     PA_LLIST_HEAD(pa_time_event, time_events);
  85     PA_LLIST_HEAD(pa_defer_event, defer_events);
  86
  87     int n_enabled_defer_events, n_enabled_time_events;
  88     int io_events_please_scan, time_events_please_scan, defer_events_please_scan;
  89
  90     pa_time_event *cached_next_time_event;
  91 };
  92
  93 static void cleanup_io_events(pa_glib_mainloop *g, int force) {
  94     pa_io_event *e;
  95
  96     e = g->io_events;
  97     while (e) {
  98         pa_io_event *n = e->next;
  99
 100         if (!force && g->io_events_please_scan <= 0)
 101             break;
 102
 103         if (force || e->dead) {
 104             PA_LLIST_REMOVE(pa_io_event, g->io_events, e);
 105
 106             if (e->dead) {
 107                 g_assert(g->io_events_please_scan > 0);
 108                 g->io_events_please_scan--;
 109             }
 110
 111             if (e->poll_fd_added)
 112                 g_source_remove_poll(&g->source, &e->poll_fd);
 113
 114             if (e->destroy_callback)
 115                 e->destroy_callback(&g->api, e, e->userdata);
 116
 117             pa_xfree(e);
 118         }
 119
 120         e = n;
 121     }
 122
 123     g_assert(g->io_events_please_scan == 0);
 124 }
 125
 126 static void cleanup_time_events(pa_glib_mainloop *g, int force) {
 127     pa_time_event *e;
 128
 129     e = g->time_events;
 130     while (e) {
 131         pa_time_event *n = e->next;
 132
 133         if (!force && g->time_events_please_scan <= 0)
 134             break;
 135
 136         if (force || e->dead) {
 137             PA_LLIST_REMOVE(pa_time_event, g->time_events, e);
 138
 139             if (e->dead) {
 140                 g_assert(g->time_events_please_scan > 0);
 141                 g->time_events_please_scan--;
 142             }
 143
 144             if (!e->dead && e->enabled) {
 145                 g_assert(g->n_enabled_time_events > 0);
 146                 g->n_enabled_time_events--;
 147             }
 148
 149             if (e->destroy_callback)
 150                 e->destroy_callback(&g->api, e, e->userdata);
 151
 152             pa_xfree(e);
 153         }
 154
 155         e = n;
 156     }
 157
 158     g_assert(g->time_events_please_scan == 0);
 159 }
 160
 161 static void cleanup_defer_events(pa_glib_mainloop *g, int force) {
 162     pa_defer_event *e;
 163
 164     e = g->defer_events;
 165     while (e) {
 166         pa_defer_event *n = e->next;
 167
 168         if (!force && g->defer_events_please_scan <= 0)
 169             break;
 170
 171         if (force || e->dead) {
 172             PA_LLIST_REMOVE(pa_defer_event, g->defer_events, e);
 173
 174             if (e->dead) {
 175                 g_assert(g->defer_events_please_scan > 0);
 176                 g->defer_events_please_scan--;
 177             }
 178
 179             if (!e->dead && e->enabled) {
 180                 g_assert(g->n_enabled_defer_events > 0);
 181                 g->n_enabled_defer_events--;
 182             }
 183
 184             if (e->destroy_callback)
 185                 e->destroy_callback(&g->api, e, e->userdata);
 186
 187             pa_xfree(e);
 188         }
 189
 190         e = n;
 191     }
 192
 193     g_assert(g->defer_events_please_scan == 0);
 194 }
 195
 196 static gushort map_flags_to_glib(pa_io_event_flags_t flags) {
 197     return (gushort)
 198         ((flags & PA_IO_EVENT_INPUT ? G_IO_IN : 0) |
 199          (flags & PA_IO_EVENT_OUTPUT ? G_IO_OUT : 0) |
 200          (flags & PA_IO_EVENT_ERROR ? G_IO_ERR : 0) |
 201          (flags & PA_IO_EVENT_HANGUP ? G_IO_HUP : 0));
 202 }
 203
 204 static pa_io_event_flags_t map_flags_from_glib(gushort flags) {
 205     return
 206         (flags & G_IO_IN ? PA_IO_EVENT_INPUT : 0) |
 207         (flags & G_IO_OUT ? PA_IO_EVENT_OUTPUT : 0) |
 208         (flags & G_IO_ERR ? PA_IO_EVENT_ERROR : 0) |
 209         (flags & G_IO_HUP ? PA_IO_EVENT_HANGUP : 0);
 210 }
 211
 212 static pa_io_event* glib_io_new(
 213         pa_mainloop_api*m,
 214         int fd,
 215         pa_io_event_flags_t f,
 216         pa_io_event_cb_t cb,
 217         void *userdata) {
 218
 219     pa_io_event *e;
 220     pa_glib_mainloop *g;
 221
 222     g_assert(m);
 223     g_assert(m->userdata);
 224     g_assert(fd >= 0);
 225     g_assert(cb);
 226
 227     g = m->userdata;
 228
 229     e = pa_xnew(pa_io_event, 1);
 230     e->mainloop = g;
 231     e->dead = 0;
 232
 233     e->poll_fd.fd = fd;
 234     e->poll_fd.events = map_flags_to_glib(f);
 235     e->poll_fd.revents = 0;
 236
 237     e->callback = cb;
 238     e->userdata = userdata;
 239     e->destroy_callback = NULL;
 240
 241     PA_LLIST_PREPEND(pa_io_event, g->io_events, e);
 242
 243     g_source_add_poll(&g->source, &e->poll_fd);
 244     e->poll_fd_added = 1;
 245
 246     return e;
 247 }
 248
 249 static void glib_io_enable(pa_io_event*e, pa_io_event_flags_t f) {
 250     g_assert(e);
 251     g_assert(!e->dead);
 252
 253     e->poll_fd.events = map_flags_to_glib(f);
 254 }
 255
 256 static void glib_io_free(pa_io_event*e) {
 257     g_assert(e);
 258     g_assert(!e->dead);
 259
 260     e->dead = 1;
 261     e->mainloop->io_events_please_scan++;
 262
 263     if (e->poll_fd_added) {
 264         g_source_remove_poll(&e->mainloop->source, &e->poll_fd);
 265         e->poll_fd_added = 0;
 266     }
 267 }
 268
 269 static void glib_io_set_destroy(pa_io_event*e, pa_io_event_destroy_cb_t cb) {
 270     g_assert(e);
 271     g_assert(!e->dead);
 272
 273     e->destroy_callback = cb;
 274 }
 275
 276 /* Time sources */
 277
 278 static pa_time_event* glib_time_new(
 279         pa_mainloop_api*m,
 280         const struct timeval *tv,
 281         pa_time_event_cb_t cb,
 282         void *userdata) {
 283
 284     pa_glib_mainloop *g;
 285     pa_time_event *e;
 286
 287     g_assert(m);
 288     g_assert(m->userdata);
 289     g_assert(cb);
 290
 291     g = m->userdata;
 292
 293     e = pa_xnew(pa_time_event, 1);
 294     e->mainloop = g;
 295     e->dead = 0;
 296
 297     if ((e->enabled = !!tv)) {
 298         e->timeval = *tv;
 299         g->n_enabled_time_events++;
 300
 301         if (g->cached_next_time_event) {
 302             g_assert(g->cached_next_time_event->enabled);
 303
 304             if (pa_timeval_cmp(tv, &g->cached_next_time_event->timeval) < 0)
 305                 g->cached_next_time_event = e;
 306         }
 307     }
 308
 309     e->callback = cb;
 310     e->userdata = userdata;
 311     e->destroy_callback = NULL;
 312
 313     PA_LLIST_PREPEND(pa_time_event, g->time_events, e);
 314
 315     return e;
 316 }
 317
 318 static void glib_time_restart(pa_time_event*e, const struct timeval *tv) {
 319     g_assert(e);
 320     g_assert(!e->dead);
 321
 322     if (e->enabled && !tv) {
 323         g_assert(e->mainloop->n_enabled_time_events > 0);
 324         e->mainloop->n_enabled_time_events--;
 325     } else if (!e->enabled && tv)
 326         e->mainloop->n_enabled_time_events++;
 327
 328     if ((e->enabled = !!tv))
 329         e->timeval = *tv;
 330
 331     if (e->mainloop->cached_next_time_event == e)
 332         e->mainloop->cached_next_time_event = NULL;
 333
 334     if (e->mainloop->cached_next_time_event && e->enabled) {
 335         g_assert(e->mainloop->cached_next_time_event->enabled);
 336
 337         if (pa_timeval_cmp(tv, &e->mainloop->cached_next_time_event->timeval) < 0)
 338             e->mainloop->cached_next_time_event = e;
 339     }
 340 }
 341
 342 static void glib_time_free(pa_time_event *e) {
 343     g_assert(e);
 344     g_assert(!e->dead);
 345
 346     e->dead = 1;
 347     e->mainloop->time_events_please_scan++;
 348
 349     if (e->enabled)
 350         e->mainloop->n_enabled_time_events--;
 351
 352     if (e->mainloop->cached_next_time_event == e)
 353         e->mainloop->cached_next_time_event = NULL;
 354 }
 355
 356 static void glib_time_set_destroy(pa_time_event *e, pa_time_event_destroy_cb_t cb) {
 357     g_assert(e);
 358     g_assert(!e->dead);
 359
 360     e->destroy_callback = cb;
 361 }
 362
 363 /* Deferred sources */
 364
 365 static pa_defer_event* glib_defer_new(
 366         pa_mainloop_api*m,
 367         pa_defer_event_cb_t cb,
 368         void *userdata) {
 369
 370     pa_defer_event *e;
 371     pa_glib_mainloop *g;
 372
 373     g_assert(m);
 374     g_assert(m->userdata);
 375     g_assert(cb);
 376
 377     g = m->userdata;
 378
 379     e = pa_xnew(pa_defer_event, 1);
 380     e->mainloop = g;
 381     e->dead = 0;
 382
 383     e->enabled = 1;
 384     g->n_enabled_defer_events++;
 385
 386     e->callback = cb;
 387     e->userdata = userdata;
 388     e->destroy_callback = NULL;
 389
 390     PA_LLIST_PREPEND(pa_defer_event, g->defer_events, e);
 391     return e;
 392 }
 393
 394 static void glib_defer_enable(pa_defer_event *e, int b) {
 395     g_assert(e);
 396     g_assert(!e->dead);
 397
 398     if (e->enabled && !b) {
 399         g_assert(e->mainloop->n_enabled_defer_events > 0);
 400         e->mainloop->n_enabled_defer_events--;
 401     } else if (!e->enabled && b)
 402         e->mainloop->n_enabled_defer_events++;
 403
 404     e->enabled = b;
 405 }
 406
 407 static void glib_defer_free(pa_defer_event *e) {
 408     g_assert(e);
 409     g_assert(!e->dead);
 410
 411     e->dead = 1;
 412     e->mainloop->defer_events_please_scan++;
 413
 414     if (e->enabled) {
 415         g_assert(e->mainloop->n_enabled_defer_events > 0);
 416         e->mainloop->n_enabled_defer_events--;
 417     }
 418 }
 419
 420 static void glib_defer_set_destroy(pa_defer_event *e, pa_defer_event_destroy_cb_t cb) {
 421     g_assert(e);
 422     g_assert(!e->dead);
 423
 424     e->destroy_callback = cb;
 425 }
 426
 427 /* quit() */
 428
 429 static void glib_quit(pa_mainloop_api*a, int retval) {
 430
 431     g_warning("quit() ignored");
 432
 433     /* NOOP */
 434 }
 435
 436 static pa_time_event* find_next_time_event(pa_glib_mainloop *g) {
 437     pa_time_event *t, *n = NULL;
 438     g_assert(g);
 439
 440     if (g->cached_next_time_event)
 441         return g->cached_next_time_event;
 442
 443     for (t = g->time_events; t; t = t->next) {
 444
 445         if (t->dead || !t->enabled)
 446             continue;
 447
 448         if (!n || pa_timeval_cmp(&t->timeval, &n->timeval) < 0) {
 449             n = t;
 450
 451             /* Shortcut for tv = { 0, 0 } */
 452             if (n->timeval.tv_sec <= 0)
 453                 break;
 454         }
 455     }
 456
 457     g->cached_next_time_event = n;
 458     return n;
 459 }
 460
 461 static void scan_dead(pa_glib_mainloop *g) {
 462     g_assert(g);
 463
 464     if (g->io_events_please_scan)
 465         cleanup_io_events(g, 0);
 466
 467     if (g->time_events_please_scan)
 468         cleanup_time_events(g, 0);
 469
 470     if (g->defer_events_please_scan)
 471         cleanup_defer_events(g, 0);
 472 }
 473
 474 static gboolean prepare_func(GSource *source, gint *timeout) {
 475     pa_glib_mainloop *g = (pa_glib_mainloop*) source;
 476
 477     g_assert(g);
 478     g_assert(timeout);
 479
 480     scan_dead(g);
 481
 482     if (g->n_enabled_defer_events) {
 483         *timeout = 0;
 484         return TRUE;
 485     } else if (g->n_enabled_time_events) {
 486         pa_time_event *t;
 487         GTimeVal now;
 488         struct timeval tvnow;
 489         pa_usec_t usec;
 490
 491         t = find_next_time_event(g);
 492         g_assert(t);
 493
 494         g_get_current_time(&now);
 495         tvnow.tv_sec = now.tv_sec;
 496         tvnow.tv_usec = now.tv_usec;
 497
 498         if (pa_timeval_cmp(&t->timeval, &tvnow) <= 0) {
 499             *timeout = 0;
 500             return TRUE;
 501         }
 502         usec = pa_timeval_diff(&t->timeval, &tvnow);
 503         *timeout = (gint) (usec / 1000);
 504     } else
 505         *timeout = -1;
 506
 507     return FALSE;
 508 }
 509 static gboolean check_func(GSource *source) {
 510     pa_glib_mainloop *g = (pa_glib_mainloop*) source;
 511     pa_io_event *e;
 512
 513     g_assert(g);
 514
 515     if (g->n_enabled_defer_events)
 516         return TRUE;
 517     else if (g->n_enabled_time_events) {
 518         pa_time_event *t;
 519         GTimeVal now;
 520         struct timeval tvnow;
 521
 522         t = find_next_time_event(g);
 523         g_assert(t);
 524
 525         g_get_current_time(&now);
 526         tvnow.tv_sec = now.tv_sec;
 527         tvnow.tv_usec = now.tv_usec;
 528
 529         if (pa_timeval_cmp(&t->timeval, &tvnow) <= 0)
 530             return TRUE;
 531     }
 532
 533     for (e = g->io_events; e; e = e->next)
 534         if (!e->dead && e->poll_fd.revents != 0)
 535             return TRUE;
 536
 537     return FALSE;
 538 }
 539
 540 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer userdata) {
 541     pa_glib_mainloop *g = (pa_glib_mainloop*) source;
 542     pa_io_event *e;
 543
 544     g_assert(g);
 545
 546     if (g->n_enabled_defer_events) {
 547         pa_defer_event *d;
 548
 549         for (d = g->defer_events; d; d = d->next) {
 550             if (d->dead || !d->enabled)
 551                 continue;
 552
 553             break;
 554         }
 555
 556         g_assert(d);
 557
 558         d->callback(&g->api, d, d->userdata);
 559         return TRUE;
 560     }
 561
 562     if (g->n_enabled_time_events) {
 563         GTimeVal now;
 564         struct timeval tvnow;
 565         pa_time_event *t;
 566
 567         t = find_next_time_event(g);
 568         g_assert(t);
 569
 570         g_get_current_time(&now);
 571         tvnow.tv_sec = now.tv_sec;
 572         tvnow.tv_usec = now.tv_usec;
 573
 574         if (pa_timeval_cmp(&t->timeval, &tvnow) <= 0) {
 575
 576             /* Disable time event */
 577             glib_time_restart(t, NULL);
 578
 579             t->callback(&g->api, t, &t->timeval, t->userdata);
 580             return TRUE;
 581         }
 582     }
 583
 584     for (e = g->io_events; e; e = e->next)
 585         if (!e->dead && e->poll_fd.revents != 0) {
 586             e->callback(&g->api, e, e->poll_fd.fd, map_flags_from_glib(e->poll_fd.revents), e->userdata);
 587             e->poll_fd.revents = 0;
 588             return TRUE;
 589         }
 590
 591     return FALSE;
 592 }
 593
 594 static const pa_mainloop_api vtable = {
 595     .userdata = NULL,
 596
 597     .io_new = glib_io_new,
 598     .io_enable = glib_io_enable,
 599     .io_free = glib_io_free,
 600     .io_set_destroy= glib_io_set_destroy,
 601
 602     .time_new = glib_time_new,
 603     .time_restart = glib_time_restart,
 604     .time_free = glib_time_free,
 605     .time_set_destroy = glib_time_set_destroy,
 606
 607     .defer_new = glib_defer_new,
 608     .defer_enable = glib_defer_enable,
 609     .defer_free = glib_defer_free,
 610     .defer_set_destroy = glib_defer_set_destroy,
 611
 612     .quit = glib_quit,
 613 };
 614
 615 pa_glib_mainloop *pa_glib_mainloop_new(GMainContext *c) {
 616     pa_glib_mainloop *g;
 617
 618     static GSourceFuncs source_funcs = {
 619         prepare_func,
 620         check_func,
 621         dispatch_func,
 622         NULL,
 623         NULL,
 624         NULL
 625     };
 626
 627     g = (pa_glib_mainloop*) g_source_new(&source_funcs, sizeof(pa_glib_mainloop));
 628     g_main_context_ref(g->context = c ? c : g_main_context_default());
 629
 630     g->api = vtable;
 631     g->api.userdata = g;
 632
 633     PA_LLIST_HEAD_INIT(pa_io_event, g->io_events);
 634     PA_LLIST_HEAD_INIT(pa_time_event, g->time_events);
 635     PA_LLIST_HEAD_INIT(pa_defer_event, g->defer_events);
 636
 637     g->n_enabled_defer_events = g->n_enabled_time_events = 0;
 638     g->io_events_please_scan = g->time_events_please_scan = g->defer_events_please_scan = 0;
 639
 640     g->cached_next_time_event = NULL;
 641
 642     g_source_attach(&g->source, g->context);
 643     g_source_set_can_recurse(&g->source, FALSE);
 644
 645     return g;
 646 }
 647
 648 void pa_glib_mainloop_free(pa_glib_mainloop* g) {
 649     g_assert(g);
 650
 651     cleanup_io_events(g, 1);
 652     cleanup_defer_events(g, 1);
 653     cleanup_time_events(g, 1);
 654
 655     g_main_context_unref(g->context);
 656     g_source_destroy(&g->source);
 657     g_source_unref(&g->source);
 658 }
 659
 660 pa_mainloop_api* pa_glib_mainloop_get_api(pa_glib_mainloop *g) {
 661     g_assert(g);
 662
 663     return &g->api;
 664 }