really create glitch-free branch

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2120 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 41 insertions, 0 deletions

diff --git a/src/pulsecore/sioman.c b/src/pulsecore/sioman.c
new file mode 100644
index 00000000..8d4c6fa7
--- /dev/null
+++ b/src/pulsecore/sioman.c
@@ -0,0 +1,41 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 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 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, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <pulsecore/macro.h>
+#include <pulsecore/atomic.h>
+
+#include "sioman.h"
+
+static pa_atomic_t stdio_inuse = PA_ATOMIC_INIT(0);
+
+int pa_stdio_acquire(void) {
+    return pa_atomic_cmpxchg(&stdio_inuse, 0, 1) ? 0 : -1;
+}
+
+void pa_stdio_release(void) {
+    pa_assert_se(pa_atomic_cmpxchg(&stdio_inuse, 1, 0));
+}