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

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