1 #ifndef foopulseoncehfoo
2 #define foopulseoncehfoo
7 This file is part of PulseAudio.
9 Copyright 2006 Lennart Poettering
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.
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.
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
27 #include <pulsecore/mutex.h>
28 #include <pulsecore/atomic.h>
30 typedef struct pa_once {
31 pa_atomic_ptr_t mutex;
32 pa_atomic_t ref, done;
35 #define PA_ONCE_INIT \
37 .mutex = PA_ATOMIC_PTR_INIT(NULL), \
38 .ref = PA_ATOMIC_INIT(0), \
39 .done = PA_ATOMIC_INIT(0) \
42 typedef void (*pa_once_func_t) (void);
44 void pa_once(pa_once_t *o, pa_once_func_t f);