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code.delx.au - pulseaudio/blob - src/pulsecore/once.h
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 /* Not to be called directly, use the macros defined below instead */
43 int pa_once_begin(pa_once
*o
);
44 void pa_once_end(pa_once
*o
);
46 #define PA_ONCE_BEGIN \
48 static pa_once _once = PA_ONCE_INIT; \
49 if (pa_once_begin(&_once)) {{
53 pa_once_end(&_once); \
59 Usage of these macros is like this:
65 ... stuff to be called just once ...
72 /* Same API but calls a function */
73 typedef void (*pa_once_func_t
) (void);
74 void pa_run_once(pa_once
*o
, pa_once_func_t f
);