blob: 8cd7894f30035e21494e4277246fdf9799a949ab (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
#ifndef foopulseoncehfoo
#define foopulseoncehfoo
/***
This file is part of PulseAudio.
Copyright 2006 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#include <pulsecore/atomic.h>
#include <pulsecore/mutex.h>
typedef struct pa_once {
pa_static_mutex mutex;
pa_atomic_t done;
} pa_once;
#define PA_ONCE_INIT \
{ \
.mutex = PA_STATIC_MUTEX_INIT, \
.done = PA_ATOMIC_INIT(0) \
}
/* Not to be called directly, use the macros defined below instead */
bool pa_once_begin(pa_once *o);
void pa_once_end(pa_once *o);
#define PA_ONCE_BEGIN \
do { \
static pa_once _once = PA_ONCE_INIT; \
if (pa_once_begin(&_once)) {{
#define PA_ONCE_END \
} \
pa_once_end(&_once); \
} \
} while(0)
/*
Usage of these macros is like this:
void foo() {
PA_ONCE_BEGIN {
... stuff to be called just once ...
} PA_ONCE_END;
}
*/
/* Same API but calls a function */
typedef void (*pa_once_func_t) (void);
void pa_run_once(pa_once *o, pa_once_func_t f);
#endif
|
