src/pulse/mainloop-api.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 2.1 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   Lesser 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 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <assert.h>
  27 #include <stdlib.h>
  28
  29 #include <pulse/xmalloc.h>
  30
  31 #include <pulsecore/gccmacro.h>
  32
  33 #include "mainloop-api.h"
  34
  35 struct once_info {
  36     void (*callback)(pa_mainloop_api*m, void *userdata);
  37     void *userdata;
  38 };
  39
  40 static void once_callback(pa_mainloop_api *m, pa_defer_event *e, void *userdata) {
  41     struct once_info *i = userdata;
  42     assert(m && i && i->callback);
  43
  44     i->callback(m, i->userdata);
  45
  46     assert(m->defer_free);
  47     m->defer_free(e);
  48 }
  49
  50 static void free_callback(pa_mainloop_api *m, PA_GCC_UNUSED pa_defer_event *e, void *userdata) {
  51     struct once_info *i = userdata;
  52     assert(m && i);
  53     pa_xfree(i);
  54 }
  55
  56 void pa_mainloop_api_once(pa_mainloop_api* m, void (*callback)(pa_mainloop_api *m, void *userdata), void *userdata) {
  57     struct once_info *i;
  58     pa_defer_event *e;
  59     assert(m && callback);
  60
  61     i = pa_xnew(struct once_info, 1);
  62     i->callback = callback;
  63     i->userdata = userdata;
  64
  65     assert(m->defer_new);
  66     e = m->defer_new(m, once_callback, i);
  67     assert(e);
  68     m->defer_set_destroy(e, free_callback);
  69 }
  70