code.delx.au - pulseaudio/blob - src/pulsecore/hook-list.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as
  10   published by the Free Software Foundation; either version 2 of the
  11   License, or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public
  19   License along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <pulsecore/macro.h>
  29
  30 #include "hook-list.h"
  31
  32 void pa_hook_init(pa_hook *hook, void *data) {
  33     pa_assert(hook);
  34
  35     PA_LLIST_HEAD_INIT(pa_hook_slot, hook->slots);
  36     hook->last = NULL;
  37     hook->n_dead = hook->firing = 0;
  38     hook->data = data;
  39 }
  40
  41 static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
  42     pa_assert(hook);
  43     pa_assert(slot);
  44
  45     if (hook->last == slot)
  46         hook->last = slot->prev;
  47
  48     PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);
  49
  50     pa_xfree(slot);
  51 }
  52
  53 void pa_hook_free(pa_hook *hook) {
  54     pa_assert(hook);
  55     pa_assert(!hook->firing);
  56
  57     while (hook->slots)
  58         slot_free(hook, hook->slots);
  59
  60     pa_hook_init(hook, NULL);
  61 }
  62
  63 pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_cb_t cb, void *data) {
  64     pa_hook_slot *slot;
  65
  66     pa_assert(cb);
  67
  68     slot = pa_xnew(pa_hook_slot, 1);
  69     slot->hook = hook;
  70     slot->dead = 0;
  71     slot->callback = cb;
  72     slot->data = data;
  73
  74     PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, hook->last, slot);
  75     hook->last = slot;
  76
  77     return slot;
  78 }
  79
  80 void pa_hook_slot_free(pa_hook_slot *slot) {
  81     pa_assert(slot);
  82     pa_assert(!slot->dead);
  83
  84     if (slot->hook->firing > 0) {
  85         slot->dead = 1;
  86         slot->hook->n_dead++;
  87     } else
  88         slot_free(slot->hook, slot);
  89 }
  90
  91 pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data) {
  92     pa_hook_slot *slot, *next;
  93     pa_hook_result_t result = PA_HOOK_OK;
  94
  95     pa_assert(hook);
  96
  97     hook->firing ++;
  98
  99     for (slot = hook->slots; slot; slot = slot->next) {
 100         if (slot->dead)
 101             continue;
 102
 103         if ((result = slot->callback(hook->data, data, slot->data)) != PA_HOOK_OK)
 104             break;
 105     }
 106
 107     hook->firing --;
 108
 109     for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
 110         next = slot->next;
 111
 112         if (slot->dead) {
 113             slot_free(hook, slot);
 114             hook->n_dead--;
 115         }
 116     }
 117
 118     return result;
 119 }
 120