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

   1 #ifndef foohooklistfoo
   2 #define foohooklistfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   Copyright 2006 Lennart Poettering
  10
  11   PulseAudio is free software; you can redistribute it and/or modify
  12   it under the terms of the GNU Lesser General Public License as
  13   published by the Free Software Foundation; either version 2 of the
  14   License, or (at your option) any later version.
  15
  16   PulseAudio is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public
  22   License along with PulseAudio; if not, write to the Free Software
  23   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  24   USA.
  25 ***/
  26
  27 #include <pulse/xmalloc.h>
  28 #include <pulse/gccmacro.h>
  29
  30 #include <pulsecore/llist.h>
  31
  32 typedef struct pa_hook_slot pa_hook_slot;
  33 typedef struct pa_hook pa_hook;
  34
  35 typedef enum pa_hook_result {
  36     PA_HOOK_OK = 0,
  37     PA_HOOK_STOP = 1,
  38     PA_HOOK_CANCEL = -1
  39 } pa_hook_result_t;
  40
  41 typedef enum pa_hook_priority {
  42     PA_HOOK_EARLY = -100,
  43     PA_HOOK_NORMAL = 0,
  44     PA_HOOK_LATE = 100
  45 } pa_hook_priority_t;
  46
  47 typedef pa_hook_result_t (*pa_hook_cb_t)(
  48         void *hook_data,
  49         void *call_data,
  50         void *slot_data);
  51
  52 struct pa_hook_slot {
  53     pa_bool_t dead;
  54     pa_hook *hook;
  55     pa_hook_priority_t priority;
  56     pa_hook_cb_t callback;
  57     void *data;
  58     PA_LLIST_FIELDS(pa_hook_slot);
  59 };
  60
  61 struct pa_hook {
  62     PA_LLIST_HEAD(pa_hook_slot, slots);
  63     int n_firing, n_dead;
  64
  65     void *data;
  66 };
  67
  68 void pa_hook_init(pa_hook *hook, void *data);
  69 void pa_hook_free(pa_hook *hook);
  70
  71 pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_priority_t prio, pa_hook_cb_t cb, void *data);
  72 void pa_hook_slot_free(pa_hook_slot *slot);
  73
  74 pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data);
  75
  76 #endif