src/pulsecore/sioman.c

   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, 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 <pulsecore/macro.h>
  27 #include <pulsecore/atomic.h>
  28
  29 #include "sioman.h"
  30
  31 static pa_atomic_t stdio_inuse = PA_ATOMIC_INIT(0);
  32
  33 int pa_stdio_acquire(void) {
  34     return pa_atomic_cmpxchg(&stdio_inuse, 0, 1) ? 0 : -1;
  35 }
  36
  37 void pa_stdio_release(void) {
  38     pa_assert_se(pa_atomic_cmpxchg(&stdio_inuse, 1, 0));
  39 }