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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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
   8   published by the Free Software Foundation; either version 2 of the
   9   License, 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
  17   License 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 #include <pulsecore/hook-list.h>
  23
  24 void pa_hook_init(pa_hook *hook, void *data) {
  25     assert(hook);
  26
  27     PA_LLIST_HEAD_INIT(pa_hook_slot, hook->slots);
  28     hook->last = NULL;
  29     hook->n_dead = hook->firing = 0;
  30     hook->data = data;
  31 }
  32
  33 static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
  34     assert(hook);
  35     assert(slot);
  36
  37     if (hook->last == slot)
  38         hook->last = slot->prev;
  39
  40     PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);
  41
  42     pa_xfree(slot);
  43 }
  44
  45 void pa_hook_free(pa_hook *hook) {
  46     assert(hook);
  47     assert(!hook->firing);
  48
  49     while (hook->slots)
  50         slot_free(hook, hook->slots);
  51
  52     pa_hook_init(hook, NULL);
  53 }
  54
  55 pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_cb_t cb, void *data) {
  56     pa_hook_slot *slot;
  57
  58     assert(cb);
  59
  60     slot = pa_xnew(pa_hook_slot, 1);
  61     slot->hook = hook;
  62     slot->dead = 0;
  63     slot->callback = cb;
  64     slot->data = data;
  65
  66     PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, hook->last, slot);
  67     hook->last = slot;
  68
  69     return slot;
  70 }
  71
  72 void pa_hook_slot_free(pa_hook_slot *slot) {
  73     assert(slot);
  74     assert(!slot->dead);
  75
  76     if (slot->hook->firing > 0) {
  77         slot->dead = 1;
  78         slot->hook->n_dead++;
  79     } else
  80         slot_free(slot->hook, slot);
  81 }
  82
  83 pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data) {
  84     pa_hook_slot *slot, *next;
  85     pa_hook_result_t result = PA_HOOK_OK;
  86
  87     assert(hook);
  88
  89     hook->firing ++;
  90
  91     for (slot = hook->slots; slot; slot = slot->next) {
  92         if (slot->dead)
  93             continue;
  94
  95         if ((result = slot->callback(hook->data, data, slot->data)) != PA_HOOK_OK)
  96             break;
  97     }
  98
  99     hook->firing --;
 100
 101     for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
 102         next = slot->next;
 103
 104         if (slot->dead) {
 105             slot_free(hook, slot);
 106             hook->n_dead--;
 107         }
 108     }
 109
 110     return result;
 111 }
 112