1/***
2  This file is part of PulseAudio.
3
4  Copyright 2004-2006 Lennart Poettering
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 published
8  by the Free Software Foundation; either version 2.1 of the License,
9  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  General Public License for more details.
15
16  You should have received a copy of the GNU Lesser General Public License
17  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
18***/
19
20#ifdef HAVE_CONFIG_H
21#include <config.h>
22#endif
23
24#include <pulsecore/macro.h>
25#include <pulsecore/atomic.h>
26
27#include "sioman.h"
28
29static pa_atomic_t stdio_inuse = PA_ATOMIC_INIT(0);
30
31int pa_stdio_acquire(void) {
32    return pa_atomic_cmpxchg(&stdio_inuse, 0, 1) ? 0 : -1;
33}
34
35void pa_stdio_release(void) {
36    pa_assert_se(pa_atomic_cmpxchg(&stdio_inuse, 1, 0));
37}
38