1 files changed, 67 insertions, 0 deletions
diff --git a/src/pulsecore/once-win32.c b/src/pulsecore/once-win32.c
new file mode 100644
index 00000000..8b9282f4
--- /dev/null
+++ b/src/pulsecore/once-win32.c
@@ -0,0 +1,67 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+ 
+  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 <assert.h>
+#include <stdio.h>
+
+#include <windows.h>
+
+#include <pulsecore/mutex.h>
+
+#include "once.h"
+
+void pa_once(pa_once_t *control, pa_once_func_t func) {
+    HANDLE mutex;
+    char name[64];
+
+    assert(control);
+    assert(func);
+
+    /* Create the global mutex */
+    sprintf(name, "pulse%d", (int)GetCurrentProcessId());
+
+    mutex = CreateMutex(NULL, FALSE, name);
+    assert(mutex);
+
+    /* Create the local mutex */
+    WaitForSingleObject(mutex, INFINITE);
+    if (!control->mutex)
+        control->mutex = pa_mutex_new(1);
+    ReleaseMutex(mutex);
+
+    CloseHandle(mutex);
+
+    /* Execute function */
+    pa_mutex_lock(control->mutex);
+    if (!control->once_value) {
+        control->once_value = 1;
+        func();
+    }
+    pa_mutex_unlock(control->mutex); 
+
+    /* Caveat: We have to make sure that the once func has completed
+     * before returning, even if the once func is not actually
+     * executed by us. Hence the awkward locking. */
+}